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はてなキーワード: phonesとは

2019-10-10

その人向けにレベルを落とした説明

中国スマホのチェックはあるみたい。IT音痴の人向けに説明した内容を、そのままなのか一部曲解したのか判らないけど、他で言っちゃうのはアレだ。

かにそういうレベル議員スマホを持ち込むのは良くないから、外務省だって絶対持ち込むの止めてね!」「電源オフならいい?」「それでもダメです。電源オフでは対策になりません」って言いたくなるし。聞いた方が「電源オフでもデータ抜かれるのか…」と思っちゃうのも、そのレベルの人だったら、仕方の無いような気はする。

「電源オフでどうやってデータ抜くの?」という一点で反論している人は、そりゃディベートならそれでいいんだろうけど。そのレベルの人が日本迷惑掛けないようにしてもらうには?という視点が欠けているように思う。

2018-08-21

anond:20180821095534

一応年2000ドルコスト根拠っぽい英文を見つけた。(情報としては古め)

多分この数字から見るに、動画月額サービスみたいな料金は入っていなくて

単純にスマホの維持費が年1700ドルオーバーになるって試算なんやろう。

https://www.investopedia.com/financial-edge/0512/the-real-cost-of-owning-a-smartphone.aspx

What It Really Costs

According to the Wall Street Journal, the average data, texting and minute plan for a smartphone costs about $2,100 for a

two-year contract. However, that's not the real cost. The average tax on smartphones is about 15% and some can be as high as

20%. On top of the taxes, you need to factor in costs like overage charges and other fees. When all of these are added together,

the average cost for owning a smartphone is $3,400 over two years.

There are a lot of comparisons out there between iPhone and Android phones, so if you're trying to decide which one is cheaper

overall, keep in mind that according to appleinsider.com, paid Android apps cost an average of 2.5 times more than paid iPhone

apps. Techcrunch.com reports that 57% of Android apps are free, versus only 28% of iPhone apps. This does not mean that if you

go with an Android phone your bill will definitely be more expensive, but you may want to keep it in mind when you decide which

phone is best for you.

日本も二年間契約で$2,100位のコストはまあ変わらないから、これに8%-10%足した年13万円位がこの文章で言う所のリアルコストに相当するだろうな。

2017-01-18

{You're stupid. Yamato Nadeshiko has gone extinct}

I noticed that 10 years passed since I started writing blogs.

While the world is increasingly connected to NET and scarping the gap between those who have information and those who do not have it every day, I think that it is unhappy that violence due to concentration of wealth is increasingly increasing power.

It is "religion" that is surprisingly personally surviving.

A certain great scholar is said to have said that "Religion is a drug of the poor"

Now that mobile phones are spreading in countries called poorest countries and the Internet covers the world now

I want to wish that such common sense is another few years of life.

"Enlightenment" which is the difference between religious leader and believer is only a concept,

The fact that Islam society does not accept social advancement as much as treating women,

It does not match the present era.

I feel even dizzy to the extent of Americans who still do not believe in the theory of evolution,

I think that it is sick if you are watching Korea who is singing and saying that it is the place of origin of its own country keyy.

I welcome the fact that China, which is misunderstood as a nationwide all countries other than his country, is finally getting cold from a hangover,

I am impressed with Putin who is handling Russia brilliantly but vodka is about to expire soon.

President of the world's largest military superpower, Christians of discrimination will truly be overworked by esprit.

The door to World War III has been opening much more than I feel.

It might be a trial from Gaia against an overly populated population.

馬鹿だな。やまとなでしこ絶滅したよ}

ふとblogを書き始めて10年経過したことに気づいた。

世の中はますますNETにつながれ情報を持つ者と持たざる者格差を日々スキャルピングしているなか、富の集中による暴力ますます力を増大させているのは不幸な事だと思う。

個人的に生き残っているのが不思議なのが「宗教」だ。

とあるお偉い学者先生は「宗教は貧者の麻薬だ」と言ったそうだが、

最貧国と呼ばれた国にも携帯電話が普及してインターネット世界を覆っている今

そんな常識もあと数年の命であることを願いたい。

宗教指導者信者の差である悟り」は概念しかないし、

イスラム教社会女性を大切にするあまり社会進出を認めないのは、

今の時代にそぐわない。

未だに進化論を信じないアメリカ人の多さには目眩すら感じるが、

なんでも自国発祥の地だと謳いキーキー騒いでる韓国なんかみてると病気だと思う。

自国以外の国は全て属国勘違いしている中国最近やっと二日酔いから冷めつつあるのには歓迎もするが、

ロシアを見事にハンドリングしているプーチンには感心するもそろそろウォッカが切れてきた。

世界一軍事大国大統領差別主義キリスト教徒なんてさすがにエスプリ効きすぎだろう。

自分が感じるよりもずっと第3次世界大戦への扉は開きつつある。

増えすぎた人口に対するガイアからの試練かもしれないね

2016-03-29

The monitoring program used by customs agencies, called Global Shield

Hydrogen peroxide and acetone are used to make triacetone triperoxide, or TATP, a powerful explosive with the consistency of granulated sugar used by operatives in their attacks against Paris and Brussels. The bombers who killed 52 in London in 2005 used it, and al Qaeda operative Richard Reid stuffed it in his shoes in a failed attempt to bring down an airliner flying from the U.K. to the U.S. in 2001.

Ehud Keinan, an Israeli chemist and one of the world’s leading authorities on TATP, said the explosive can be made with minimal technical skill and household equipment. “You can start in the evening, and in the morning it will be ready,” Mr. Keinan said.

Read More

Belgium Frees Man Charged in Brussels Airport Attack

Belgium Turns to U.S. for Help With Seized Laptops, Phones

Terror Network’s Web Sprawls Beyond Brussels and Paris

Brussels Terrorist Khalid el-Bakraoui Traveled to Greece From Italy

Brussels Struggles to Regain Its Balance

Belgium Rues Missed Terror Signs

The EU’s regulatory system, among the strictest in the world, depends on businesses reporting suspicious transactions of hydrogen peroxide, acetone and a number of other chemicals to the police. Businesses are urged to look for a number of red flags, such as if the customer’s use for the chemical is unclear or the purchase is made using large amounts of cash. The rules also ban consumers from owning seven potentially dangerous chemical solutions, including hydrogen peroxide solution, in concentrations higher than 12%.

But the fact that the chemicals have so many commercial applications—from disinfecting pools to removing nail polish—makes identifying suspicious transactions challenging. Authorities and experts say the huge quantity of legitimate trade of such widely-used chemicals means finding suspicious transactions is effectively like picking a needle out of a haystack.

It’s a very difficult area because there are thousands of legitimate uses for these substances,” said Peter Newport, chief executive of the Chemical Business Association, which represents U.K. chemical distributors.

Some officials have also expressed worries that not all of the 28 EU governments have swiftly implemented the regulations, failing, for example, to create a contact point in law enforcement that would investigate suspicious transactions.

It remains unclear how the Islamic State operatives obtained the chemicals. An official with the Belgian Association of Chemical Distributors wasn’t aware of any suspicious transactions reported to the police in recent months. A Belgian police spokesman declined to comment.

It’s a very difficult area because there are thousands of legitimate uses for these substances.’

—Peter Newport, chief executive of the Chemical Business Association

The monitoring program used by customs agencies, called Global Shield, was sought by U.S. authorities seeking to stop the flow of bomb-making chemicals into Afghanistan, where insurgents used them to build bombs that were killing U.S. troops. These chemicals were mainly ammonium-nitrate fertilizer or potassium chlorate shipped from China for use in Pakistan’s match industry and then smuggled across the border.

Now shipments of these chemicals crisscrossing the globe are monitored through a system maintained at the World Customs Organization in Brussels. Customs agencies are supposed to warn each other about suspicious shipments, using some of the same criteria identified in the European regulations.

TATP poses a particularly serious threat to aviation, says Mr. Keinan. The chemical isn’t detectable, he says, by the machines installed at many airports, which are able to uncover more common, nitrogen-based explosives such as TNT. Dogs can also be trained to detect the material.

http://www.hotelgregor.cz/dawn-of-justicew-atch-batman-superman-online-full-movie/

http://www.hotelgregor.cz/dawn-of-justicew-atch-batman-superman-online-full-movie/

http://www.hotelgregor.cz/dawn-of-justicew-atch-batman-superman-online-full-movie/

2012-11-04

ipad mini比較レビュー。とちょっと苦言。

7inchタブレット検討していたので近所の家電量販店へ。

10mほどの距離を置いてipad mininexus 7モックがあり、交互に触ることが出来た。

どちらも偉大な発明だと思ったけれど。

結論としては、7inchタブを10inchタブと違って、「携帯して使うデバイス」とするなら、nexus 7の方が完成度が若干高いと感じた。理由は以下。

サイズと、それ故の持つ時の体感について

居間で座って使う時とは違って、立って使う、揺れている環境で使う事がある携帯デバイスでは、最も大切な事は持ちやすさだ。

いくらブックストアが充実していようが、ブラウジングが快適であろうが、画面と筐体を持つ事に気を取られては意味は無い。

15mmしか差は無いはずなのだが、ipad miniの方が横幅が広く片手で鷲掴みしにくい。出来たとしても第二関節が伸びた状態になり窮屈で、長時間は恐らくやってられない。

nexus 7は安定感をもって鷲掴み出来る。

では鷲掴みをやめて親指とその他で挟むように持つとする。

安定感を持って掴もうとするとipad miniはベゼルが狭いせいで親指が画面にかかる。

appleはこれを先取りして親指を検知しないチューニングにしているらしいが、操作時以外で表示面を触るのは精神的に気持ちよくないし、やはり指が邪魔

nexus 7はベゼルに余裕があるのでこの持ち方でも問題はない。

さらにこの持ち方だと、nexus 7は裏側が滑り止めのような素材になっていて安心感があるのに対し、ipad miniサラサラアルミ。差は言わずもがな

また蛇足である120mmと135mmという大きさは、ポケットに入るかどうかの微妙ボーダーライン上にある。

今近くに定規と衣類がある方は、ズボンの尻ポケットやジャケットの内ポケットを測ってみるといい。大体12~14cmくらいのハズだ。

nexus 7は入るがipad miniは入らない」ポケットはかなり存在する。

GPSマップに関して

携帯用デバイスである上地図は重要だ。

その点でnexus 7wifiモデルにもGPSを積んでいるは評価されるべきだ。

マップアプリクオリティは、ね、うん。

アレ

以上のように、携帯デバイスとして重要な点においてnexus 7の方が使いやすいと感じた。

http://blog.livedoor.jp/dankogai/archives/51834635.html

から少なくとも、nexus 7を買った人が「情弱」などと呼ばれる筋合いは無い。

あるのは3G抜きの大きなAndroid Phonesだけなのだ

そのとおり、持ちやすいという意味でね。

ipad2以上にiPadだった。

そのとおり、少々持ちにくいという意味で。

携帯デバイスとしての着眼点がズレているから評価が反転している。

http://www.itmedia.co.jp/pcuser/articles/1210/31/news036_2.html

これに関しては更にひどい。

「片手操作」の魅力こそが存在意義

らしいが、日本人ipad mini携帯デバイスとしての使用シーンで片手操作などしたら、使い始めて一週間で落として傷をつけるだろう。

ただ単に「市場流通しているいろいろなサイズタブレットを見渡したところ7インチが1番売れ筋っぽいから7インチにした」と決まったものではない。

と謎の断定をしているが、僕は違うと思う。

7inch市場が注目されているから作る事を決めた → 7inch台を名乗りながら画面を大きさを売りとするためギリギリの7.9inchとした

→ 結果横幅が広くなりすぎた → ベゼルを削って横幅を狭めた → ベゼルが無い為の誤操作を防ぐために画面端のタッチを調節した

というのが一番ありそうな話ではないだろうか。

つぶやき

実際触ってみて、ipad miniデザインや高級感は素晴らしいものがあったのですが、携帯用としてはちょっとウーンという感じでした。あとやっぱり画面は粗いよ。

ただまぁ繰り返しますが、nexus 7ipad miniも偉大な発明であることは疑いの余地は無く、どちらかを買って失敗ということは無いとおもいます

別に家で使う事もあるだろうから、他にも色々な比較があり得るだろうしね。

ただ、2つ例を挙げたけど、まともなレビュー殆ど無く、他も含めてapple広報なのかと疑うようなモノばかりだったのでこの記事を書いてみました。

例えば「魔法」とか(文字通り)マジックワードを使ったレビューは疑ってかかるべき。

2012-01-16

What kind of batteries belong to the green environmental protection battery?

The green environmental protection battery is to point to in recent years has been put into use or are development, the development of kind of high performance, no pollution batteries. At present already use large nickel metal hydride battery, the lithium ion battery and is expanded use of mercury free alkaline battery manganese zinc and rechargeable batteries and is research and development of lithium or lithium ion plastic pack and fuel cells belong to this category. In addition, it is widely used and use of solar energy for photoelectric convert solar cell (also called photovoltaic power generation), can also be included in this category.

Nickel metal hydride battery (Ni-MH) and nickel cadmium battery (Ni-Cd) have the same working voltage (1.2 V), due to the adoption of rare earth alloy or TiNi alloy anode materials for the activity of hydrogen storage material, replacing the carcinogen cadmium, which not only makes this battery became a kind of green environmental protection battery, and make a battery of energy than increased nearly 40%, to 80-60 Wh/kg and 210-240 Wh/L. The battery is 90 s gradually realize industrialization PANASONIC VW-VBK360 Battery , and the first to use in the cell phone battery. At present although it on their dominance of the gradually be lithium ion battery replaced, but mobile phone applications in Europe and America, and its market share is still at about 50%.

The lithium ion battery (Li-ion) is by can make the lithium ion embedding and take off the carbon embedded as negative, reversible intercalated-li metal oxide as the positive (LiCoO2, LiNiO2 or LiMn2O4) and organic electrolyte constitute, the working voltage of 3.6 V, so a lithium-ion battery is equivalent to three cadmium nickel metal hydride battery or nickel. Thus the batteries than energy is the over 100 Wh/kg and 280 Wh/L, and considerably more than the nickel metal hydride battery than energy. In view of the above advantages, since the 1993-2000 in just a few years, its production and usage with extremely high speed growth.

Alkaline manganese zinc dry (alkaline) compared with ordinary dry cell size has higher capacity PANASONIC CGA-S005E Battery, and have high discharge current ability. In recent years has been used on mercury zinc powder, therefore make the battery become a green battery, and become the mainstream battery products, at present the alkaline xinmeng dry cell is still BP machine use most power supply. At the same time, the world is the battery charged on the sex, an American company has launched a charged battery alkali manganese, product and application of slow growth. Such batteries keep the battery discharge characteristics, but also can be recharged using a dozen times to hundreds of times (deep recharge cycles life of about 25 times).

Lithium plastic battery (LIP) is for lithium metal anode, conductive polymers of electrolyte for new battery, the energy than has reached 170 Wh/kg and 350 Wh/L. The lithium ion battery is will present plastic of organic lithium ion battery electrolyte stored in a polymer membrane, or use conductive polymer as electrolyte, make a battery in no free the electrolyte. Such batteries can use aluminum plastic composite membrane realize hot pressing encapsulation, with light weight, shape can be arbitrary change, safety better characteristics.

Fuel cells (FC) is a kind of use of fuel (such as hydrogen or contain fuel) and antioxidant (such as pure oxygen or the oxygen in air) for power generation device directly, because avoided the carnot cycle limit, this power unit is not only high efficiency (electrochemical reactions conversion efficiency can be as high as 40% or more), and no pollution discharge gas, so is the future of efficient and clean power generation method. Many companies at home and abroad are engaged in development for mobile phones, notebook computers, the PEM fuel cell, once put into application, and its economy benefit greatly.

Seal lead-acid battery is a kind of lead-acid batteries.

The following new green battery technology and related industry development is rapid.

1. Hydrogen storage material and nickel metal hydride Battery-the nimh batteries (PANASONIC CGA-S101E/1B Battery)

2. Lithium ion embedded material and liquid electrolyte of lithium ion battery

3. Polymer electrolyte of lithium battery or lithium ion battery

4. Zinc air battery and PEM fuel cell

In addition to the above, in view of the communication industry growth, China's battery industry is with extremely high speed to promote environmental protection mercury-free alkali manganese zinc original pool and rechargeable batteries and seal lead-acid battery technology development and application expansion market.

2012-01-06

Article 14 the mobile phone will know the battery skills

If users want to prolong battery the efficient use of the time, in addition to the quality of the charger to have the guarantee, the right skills and charging is essential, because of low quality charger or wrong charging methods would affect battery time and life cycle, the following is about to charge skills:

1. The battery before they leave the factory, manufacturers were activated processing, and the charge, so the battery are more electricity, my friends say battery charging adjustment period in accordance with the time, standby still seriously insufficient, assuming that the battery is really quality goods battery of words, this kind of circumstance should extend the setting and then 3 ~ 5 times fully charge and discharge.

2. If new phone is lithium ion battery, so before 3 ~ 5 times charging commonly known as adjustment period, should be charged more than 14 hours, in order to ensure that the fully activate lithium ion activity. The lithium ion battery no memory effects, but have very strong sui sex, should give full activated PANASONIC CGR-D220 Battery, to guarantee the use of after can reach the right performance.

3. Some automation intelligent quick charger when instructions lights change, said only full of 90%. The charger will automatically change with slow charge will batteries. Best will use after batteries, otherwise, it will shorten use time.

4. Before charging and discharging lithium battery does not need special, but will not discharge damage to the battery. As far as possible when charging at the slow ChongChongDian, reduce the way quick charge; Time don't more than 24 hours. The battery after three to five times fully recharge cycles of internal after chemical will be all "activate" to achieve the best use effect.

5. Please use the original or the reputation of the good brand charger, li-ion battery to lithium battery charger with special, and follow the instructions, otherwise, it will damage to the battery, and even dangerous.

6. Have many users often in charge still leave her cell phone, actually such will be very easy to PANASONIC CGA-S101E/1B Battery damage the service life of the mobile phone, because in charge of the process, the circuit boards of mobile phone can calorific, if this time more exotic phone, may produce instant backflow current, internal parts to mobile phone damage.

7. The battery life depends on the number repeatedly charging and discharging, so should try to avoid more battery electric charge when, this will shorten battery life. Cell phone time more than 7 days, supposed to completely discharge the cell phone battery, enough electricity before use.

8. The cell phone battery have self-discharge, need not when the nimh batteries will press the residual capacity every day, about 1% of the discharge, lithium battery every day to 0.2% ~ 0.3% discharge. In for the battery, try to use the special socket, don't will the home appliance such as the Shared and the TV charger socket.

9. Though the phones in the network coverage area, but in the cell phone charge, cell phones have been unable to accept and call. At this time, can use of the mobile phone is not transfer function, will be transferred to the mobile phone side of fixed telephone in order to prevent calls lost, this kind of method for mobile phone is not in the network coverage of the area or weak signal and temporarily unable to the applicable also.

10. Don't will be exposed to high temperature or cold PANASONIC DMW-BCG10E Battery , as the dog, should not put the phone on the car, and the sun blazed through the; Or get air conditioning room, in air conditioning to be blown continuously place. When charging, the battery is a little heat is normal, but can't let it what the high temperature "suffer". In order to avoid the happening of this kind of circumstance, had better be in charge at room temperature, and don't cover anything on the mobile phone.

11. Nickel cadmium (N iCd) before the battery must ensure that the batteries are no electricity, recharging the battery must ensure that sufficient electricity after.

12. If the cell phone battery placed too long and not use, the best maintenance department to cell phones to the application for a live processing, also can use a constant dc voltage is the voltage adjustment for 5 ~ 6 V, current 500 ~ 600 mA reverse connect battery. Note that a touch namely release, the most repeated three times can, through such treatment after another, with the original adapter to "adaptation" charge.

13. Charge is not as long as possible, to no protection circuit batteries that should stop after charging, or the battery will with fever or overheating impact performance.

14. Lithium ion battery must choose special charger, otherwise may not reach the saturated state, affect their performance. Charging completes, should avoid to place in charger on more than 12 hours or more, long-term need not when should make a battery and cell phone separation.

2012-01-05

Types of digital cameras

Digital cameras are made in a wide range of sizes, prices and capabilities. The majority are camera phones, operated as a mobile application through the cellphone menu. Professional photographers and many amateurs use larger, more expensive digital single-lens reflex cameras (DSLR) for their greater versatility. Between these extremes lie digital compact cameras and bridge digital cameras that "bridge" the gap between amateur and professional cameras. Specialized cameras including multispectral imaging equipment and astrographs continue to serve the scientific, military, medical and other special purposes for which digital photography was invented.

[edit]Compact digital cameras

Subcompact with lens assembly retracted

Compact cameras are designed to be tiny and portable and are particularly suitable for casual and "snapshot" uses. Hence, they are also called point-and-shoot cameras. The smallest, generally less than 20 mm thick, are described as subcompacts or "ultra-compacts" and some are nearly credit card size.[2]

Most, apart from ruggedized or water-resistant models, incorporate a retractable lens assembly allowing a thin camera to have a moderately long focal length and thus fully exploit an image sensor larger than that on a camera phone, and a mechanized lens cap to cover the lens when retracted. The retracted and capped lens is protected from keys, coins and other hard objects, thus making it a thin, pocketable package. Subcompacts commonly have one lug and a short wrist strap which aids extraction from a pocket, while thicker compacts may have two lugs for attaching a neck strap.

Compact cameras are usually designed to be easy to use, sacrificing advanced features and picture quality for compactness and simplicity; images can usually only be stored using lossy compression (JPEG). Most have a built-in flash usually of low power, sufficient for nearby subjects. Live preview is almost always used to frame the photo. Most have limited motion picture capability. Compacts often have macro capability and zoom lenses but the zoom range is usually less than for bridge and DSLR cameras. Generally a contrast-detect autofocus system, using the image data from the live preview feed of the main imager, focuses the lens.

Typically, these cameras incorporate a nearly silent leaf shutter into their lenses.

For lower cost and smaller size, these cameras typically use image sensors with a diagonal of approximately 6 mm, corresponding to a crop factor around 6. This gives them weaker low-light performance, greater depth of field, generally closer focusing ability, and smaller components than cameras using larger sensors.

Starting in 2011, some compact digital cameras can take 3D still photos. These 3D compact stereo cameras can capture 3D panoramic photos for play back on a 3D TV.[3] Some of these are rugged and waterproof, and some have GPS, compass, barometer and altimeter. [4]

[edit]Bridge cameras

Sony DSC-H2

Main article: Bridge camera

Bridge are higher-end digital cameras that physically and ergonomically resemble DSLRs and share with them some advanced features, but share with compacts the use of a fixed lens and a small sensor. Like compacts, most use live preview to frame the image. Their autofocus uses the same contrast-detect mechanism, but many bridge cameras have a manual focus mode, in some cases using a separate focus ring, for greater control. They originally "bridged" the gap between affordable point-and-shoot cameras and the then unaffordable earlier digital SLRs.

Due to the combination of big physical size but a small sensor, many of these cameras have very highly specified lenses with large zoom range and fast aperture, partially compensating for the inability to change lenses. On some, the lens qualifies as superzoom. To compensate for the lesser sensitivity of their small sensors, these cameras almost always include an image stabilization system to enable longer handheld exposures.

These cameras are sometimes marketed as and confused with digital SLR cameras since the appearance is similar. Bridge cameras lack the reflex viewing system of DSLRs, are usually fitted with fixed (non-interchangeable) lenses (although some have a lens thread to attach accessory wide-angle or telephoto converters), and can usually take movies with sound. The scene is composed by viewing either the liquid crystal display or the electronic viewfinder (EVF). Most have a longer shutter lag than a true dSLR, but they are capable of good image quality (with sufficient light) while being more compact and lighter than DSLRs. High-end models of this type have comparable resolutions to low and mid-range DSLRs. Many of these cameras can store images in a Raw image format, or processed and JPEG compressed, or both. The majority have a built-in flash similar to those found in DSLRs.

In bright sun, the quality difference between a good compact camera and a digital SLR is minimal but bridgecams are more portable, cost less and have a similar zoom ability to dSLR. Thus a Bridge camera may better suit outdoor daytime activities, except when seeking professional-quality photos.[5]

In low light conditions and/or at ISO equivalents above 800, most bridge cameras (or megazooms) lack in image quality when compared to even entry level DSLRs. However, they do have one major advantage: their much larger depth of field due to the small sensor as compared to a DSLR, allowing larger apertures with shorter exposure times.

A 3D Photo Mode was introduced in 2011, whereby the camera automatically takes a second image from a slightly different perspective and provides a standard .MPO file for stereo display. [6]

[edit]Mirrorless interchangeable-lens camera

Main article: Mirrorless interchangeable-lens camera

In late 2008, a new type of camera emerged, combining the larger sensors and interchangeable lenses of DSLRs with the live-preview viewing system of compact cameras, either through an electronic viewfinder or on the rear LCD. These are simpler and more compact than DSLRs due to the removal of the mirror box, and typically emulate the handling and ergonomics of either DSLRs or compacts. The system is used by Micro Four Thirds, borrowing components from the Four Thirds DSLR system.

[edit]Digital single lens reflex cameras

Cutaway of an Olympus E-30 DSLR

Main article: Digital single-lens reflex camera

Digital single-lens reflex cameras (DSLRs) are digital cameras based on film single-lens reflex cameras (SLRs). They take their name from their unique viewing system, in which a mirror reflects light from the lens through a separate optical viewfinder. At the moment of exposure the mirror flips out of the way, making a distinctive "clack" sound and allowing light to fall on the imager.

Since no light reaches the imager during framing, autofocus is accomplished using specialized sensors in the mirror box itself. Most 21st century DSLRs also have a "live view" mode that emulates the live preview system of compact cameras, when selected.

These cameras have much larger sensors than the other types, typically 18 mm to 36 mm on the diagonal (crop factor 2, 1.6, or 1). This gives them superior low-light performance, less depth of field at a given aperture, and a larger size.

They make use of interchangeable lenses; each major DSLR manufacturer also sells a line of lenses specifically intended to be used on their cameras. This allows the user to select a lens designed for the application at hand: wide-angle, telephoto, low-light, etc. So each lens does not require its own shutter, DSLRs use a focal-plane shutter in front of the imager, behind the mirror.

[edit]Digital rangefinders

Main article: Rangefinder camera#Digital rangefinder

A rangefinder is a user-operated optical mechanism to measure subject distance once widely used on film cameras. Most digital cameras measure subject distance automatically using electro-optical techniques, but it is not customary to say that they have a rangefinder.

[edit]Line-scan camera systems

A line-scan camera is a camera device containing a line-scan image sensor chip, and a focusing mechanism. These cameras are almost solely used in industrial settings to capture an image of a constant stream of moving material. Unlike video cameras, line-scan cameras use a single row of pixel sensors, instead of a matrix of them. Data coming from the line-scan camera has a frequency, where the camera scans a line, waits, and repeats. The data coming from the line-scan camera is commonly processed by a computer, to collect the one-dimensional line data and to create a two-dimensional image. The collected two-dimensional image data is then processed by image-processing methods for industrial purposes.

Further information: Rotating line camera

[edit]Integration

Many devices include digital cameras built into or integrated into them. For example, mobile phones often include digital cameras; those that do are known as camera phones. Other small electronic devices (especially those used for communication) such as PDAs, laptops and BlackBerry devices often contain an integral digital camera, and most 21st century camcorders can also make still pictures.

Due to the limited storage capacity and general emphasis on convenience rather than image quality, almost all these integrated or converged devices store images in the lossy but compact JPEG file format.

Mobile phones incorporating digital cameras were introduced in Japan in 2001 by J-Phone. In 2003 camera phones outsold stand-alone digital cameras, and in 2006 they outsold all film-based cameras and digital cameras combined. These camera phones reached a billion devices sold in only five years, and by 2007 more than half of the installed base of all mobile phones were camera phones. Sales of separate cameras peaked in 2008. [7]

Integrated cameras tend to be at the very lowest end of the scale of digital cameras in technical specifications, such as resolution, optical quality, and ability to use accessories. With rapid development, however, the gap between mainstream compact digital cameras and camera phones is closing, and high-end camera phones are competitive with low-end stand-alone digital cameras of the same generation.

[edit]Waterproof

A Canon WP-1 waterproof 35 mm film camera

Waterproof digital cameras are digital cameras that can make pictures underwater. Waterproof housings have long been made but they cost almost as the cameras. Many waterproof digital cameras are shockproof and resistant to low temperatures; one of them is Canon PowerShot D10, one of the first underwater digital cameras.

These cameras become very popular during the holiday season, because many people want to save the best moments from their holidays at the seaside. Waterproof watches and mobile phones were produced earlier. Most makers of digital cameras also produce waterproof ones and every year they launch at least one new model, for example Sony, Olympus, Canon, Fuji.

Healthways Mako Shark, an early waterproof camera,[8] was launched in 1958 and cost around 25 dollars. It was a huge camera and pictures were black and white.

___________________________

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2011-12-31

MIT develops new fast-charging battery technology ideal for automobiles

February With the world going mobile and billions of new devices requiring electrical storage, battery technology is almost certainly due for a renaissance in the near future and recent developments suggest MIT will play a role in the next significant battery technology. Less than a week ago, we reported on work being done by MIT's Laboratory for Electromagnetic and Electronic Systems (LEES) that could become the first technologically significant and economically viable alternative to conventional batteries in 200 years. Now a second new and highly promising battery technology is emerging from MIT - a new type of lithium battery that could become a cheaper alternative to the batteries that now power hybrid electric cars.

Until now, lithium batteries have not had the rapid charging capability or safety level needed for use in cars. Hybrid cars now run on nickel metal hydride batteries, which power an electric motor and can rapidly recharge while the car is decelerating or standing still.

But lithium nickel manganese oxide, described in a paper to be published in Science on Feb. 17, could revolutionize the hybrid car industry -- a sector that has "enormous growth potential," says Gerbrand Ceder, MIT professor of materials science and engineering, who led the project.

"The writing is on the wall. It's clearly happening," said Ceder, who said that a couple of companies are already interested in licensing the new lithium battery technology.

The new material is more stable (and thus safer) than lithium cobalt oxide batteries, which are used to power small electronic devices like cell phones, laptop computers, rechargeable personal digital assistants (PDAs) and such medical devices as pacemakers.

The small safety risk posed by lithium cobalt oxide is manageable in small devices but makes the material not viable for the larger batteries needed to run hybrid cars, Ceder said. Cobalt is also fairly expensive, he said.

The MIT team's new lithium battery contains manganese and nickel, which are cheaper than cobalt.

Scientists already knew that lithium nickel manganese oxide could store a lot of energy, but the material took too long to charge to be commercially useful. The MIT researchers set out to modify the material's structure to make it capable of charging and discharging more quickly.

Lithium nickel manganese oxide consists of layers of metal (nickel and manganese) separated from lithium layers by oxygen. The major problem with the compound was that the crystalline structure was too "disordered," meaning that the nickel and lithium were drawn to each other, interfering with the flow of lithium ions and slowing down the charging rate.

Lithium ions carry the battery's charge, so to maximize the speed at which the battery can charge and discharge, the researchers designed and synthesized a material with a very ordered crystalline structure, allowing lithium ions to freely flow between the metal layers.

A battery made from the new material can charge or discharge in about 10 minutes -- about 10 times faster than the unmodified lithium nickel manganese oxide. That brings it much closer to the timeframe needed for hybrid car batteries, Ceder said.

Before the material can be used commercially, the manufacturing process needs to be made less expensive, and a few other modifications will likely be necessary, Ceder said.

Other potential applications for the new lithium battery include power tools, electric bikes, and power backup for renewable energy sources.

The lead author on the research paper is Kisuk Kang, a graduate student in Ceder's lab. Ying Shirley Meng, a postdoctoral associate in materials science and engineering at MIT, and Julien Breger and Clare P. Grey of the State University of New York at Stony Brook are also authors on the paper.

The research was funded by the National Science Foundation and the U.S. Department of Energy.

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2011-12-29

Portable electronic equipment battery technology

1, about the trickle charge, rapid charging and stable battery charging algorithm

According to the energy requirements of the final application, a battery may contain up to 4 lithium ion or lithium polymer battery core, its configuration will have a variety of change, at the same time with a mainstream power adapter: direct adapter, USB interface or car charger. Remove the core quantity, core configuration or power adapter type difference, the battery has the same charge characteristics. So they charge algorithm. Lithium ion and li-ion polymer battery best charging algorithm can divided into three phases: trickle charge, rapid charging and stable charge.

trickle charge. For depth discharge core to charge. When core voltage in less than about 2.8 V, use a constant 0.1 C of the current charging for it.

fast charging. Core voltage trickle charge more than the threshold, improve the charging current rapid charging. Fast charging current should be lower than 1.0 C.

stable voltage. In the fast charging process, once the core 4.2 V voltage, stable voltage phase began. This is through the minimum charge current or timer or of the two joint to interrupt charge. When the minimum current below about 0.07 C, can interrupt charge. The timer is to rely on a default to trigger the timer interrupt.

Advanced battery charger with additional security function normally. For example, if the core temperature exceeds the given window, usually 0 ℃-45 ℃, charge will be suspended.

Remove some very low-end equipment, now on the market/li-ion polymer lithium ion battery solutions are integrated with the outer components or, in accordance with the characteristics of the charging to charge, this is not just to get better effect charge, but also for safety.

lithium ion/polymer battery charge is an example of applications-double input 1.2 A lithium battery charger LTC4097

LTC4097 can be used to exchange adapter or USB power supply for single quarter/polymer lithium ion battery. Figure 1 for double input 1.2 A lithium battery charger LTC4097 schemes. It USES constant current/constant voltage algorithm charging, from exchange adapter power charge, programmable filling up to 1.2 electric current A, and with USB power can be as high as 1 A, at the same time, automatic detection in each input voltage whether there. This device also provide USB the current limit. Applications include PDA, MP3 players, digital camera, light portable medical and test equipment and big color cellular phone. The performance characteristics: no external micro controller charging termination; The input power automatic detection and choice; Through the resistance from the exchange of charging adapter input can be as high as 1.2 A programming charge current; The resistance of programmable USB charging current is up to 1 A; 100% or 20% USB charging current set; The input power output and existing bias NTC (VNTC) pin as a 120 mA drive ability; NTC thermistors input (NTC) pin for temperature qualified charged; Pre-settings battery voltage with floating plus or minus 0.6% accuracy; Thermal regulation maximize charge rate and free hot air LTC4097 can be used to exchange adapter or USB power supply for single quarter/polymer lithium ion battery. The use of constant current/constant voltage algorithm charging, from exchange adapter power charge, programmable filling up to 1.2 electric current A, and with USB power can be as high as 1 A, at the same time, automatic detection in each input voltage whether there. This device also provide USB the current limit. Applications include PDA, MP3 players, digital camera, light portable medical and test equipment and big color cellular phone.

2, lithium ion/polymer battery scheme

Lithium ion/polymer battery charge scheme for different number of core, core configuration, and power types are different. At present mainly have three main charging scheme: linear, Buck (step-down) switch and SEPIC (booster and step-down) switch.

2.1 linear scheme

When the input voltage in big with the charger with sufficient clearance of core after opening voltage, it is linear scheme, especially 1.0 C fast charging current than 1 A big too much. For example, MP3 players usually only one core, capacity from 700 to 1500 mAh differ, full charge voltage is open 4.2 V. MP3 player power is usually the AC/DC adapter or USB interface, the output is the rule of 5 V; At this time, the linear scheme is the most simple, most charger of the efficiency of the scheme. Figure 2 shows for lithium ion/polymer battery solution linear scheme, basic structure and linear voltage neat device.

linear scheme charger application examples-double input Li + charger and intelligent power source selector MAX8677A

MAX8677A is double input USB/AC adapter linear charger, built-in Smart Power Selector, used for rechargeable single quarter by Li + batteries portable devices. The charger integration of the battery and the external power source and load switch charging all the power switch, so that no external MOSFET. MAX8677A ideal used in portable devices, such as smart phones, PDA, portable media players, GPS navigation equipment, digital camera, and digital cameras.

MAX8677A can work in independent USB and the power input AC adapter or two input either one of the input. When connecting external power supply, intelligent power source selector allows the system not connect battery or can and depth discharge battery connection. Intelligent power source selector will automatically switch to the battery system load, use the system did not use the input power supply parts for battery, make full use of limited USB and adapter power supply input. All the needed electric current detection circuit, including the integration of the power switch, all integration in the piece. DC input current highest limit can be adjusted to 2 A and DC and USB input all can support 100 mA, 500 mA, and USB hung mode. Charge current can be adjusted to as high as 1.5 A, thus support wide range of battery capacitive. Other features include MAX8677A thermal regulation, over-voltage protection, charging status and fault output, power supply good surveillance, battery thermistors surveillance, and charging timer. MAX8677A using save a space, hot enhanced, 4 mm x 4 mm, 24 of the pins TQFN encapsulation, regulations, work in exceptional temperature range (40 ~ + 85 ℃).

2.2 Buck (step-down) switch scheme

When A 1.0 C of the charging current more than 1 A, or the input voltage of the core than with high voltage open many, Buck or step-down plan is A better choice. For example, based on the hard drive in the PMP, often use single core lithium ion battery, the full of open is 4.2 V voltage, capacity from 1200 to 2400 mAh range. And now PMP is usually use the car kit to charge, its output voltage in a 9 V to 16 between V. In the input voltage and battery voltage is the voltage difference between high (minimum 4.8 V) will make linear scheme lowers efficiency. This kind of low efficiency, plus more than 1.2 A 1 C fast charging electric current, have serious heat dissipation problems. To avoid this kind of situation, will the Buck scheme. Figure 3 for lithium ion/polymer battery charger scheme Buck diagram, basic structure with Buck (step-down) switching voltage regulators completely the same.

2.3 SEPIC (booster and step-down) switch scheme

In some use of three or four lithium ion/polymer core series equipments, charger of the input voltage is not always greater than the battery voltage. For example, laptop computers use 3 core lithium ion battery, full charge voltage is open 12.6 V (4.2 V x3), capacity is 1800 mAh to 3600 mAh from. Power supply input or output voltage is 1 6 V AC/DC adapter, or is car kit, the output voltage in a 9 V to 16 between V. Apparently, the linear and Buck solutions are not for this group of batteries. This is about to use SEPIC scheme, it can in the output voltage is higher than when the battery voltage, can be in the output voltage less than when the battery.

3, and power detection algorithm is proposed

Many portable products use voltage measurements to estimate the remaining battery power, but the battery voltage and surplus power relationship but will with the discharge rate, temperature and battery aging degree of change, make this kind of method can top 50% margin of error. The market for longer to use product demand unceasingly strengthens, so the system design personnel need more accurate solution. Use capacity check plan come to measure battery or consumption of electricity, will be in a wide range of application power to provide more accurate estimate of the battery power.

3.1 power detection algorithm is one of the examples of application, function complete list, double the battery portable battery application design

power detection principle. Good capacity check plan at least to have battery voltage, temperature and battery electric current, measuring method; A micro 9 a; And a set of and the verification of the punishment power detection algorithm is proposed. Bq2650x and bq27x00 is full capacity check program function, with a measuring voltage and temperature of the digital converter (ADC) and a measuring electric current and charging sensor the asp. These capacity check plan also has a microprocessor, is responsible for the implementation of the Texas instruments power detection algorithm is proposed. The algorithm can compensate the lithium ion battery life.low self-discharge, aging, the temperature and discharge rate, and other factors. Chip embedded microprocessor as host system processor save these calculation burden. Capacity check program can provide remaining power state information, bq27x00 series products also offer surplus can Run Time (Run Time to Empty) host may at any Time to capacity check plan these information query, then LED indicator light through or displays will inform the user battery. Capacity check meter is very easy to use, the system processor need only configuration 12 C or HDQ communication drive can.

The battery circuit description. Figure 4 (a) can be used for identification of IC functions with typical application circuit batteries. According to the use of IC testing program is different, the battery needs to have at least three to four outside the terminal.

VCC and BAT pins will even to the battery voltage, so that for, C power and the battery voltage measurement. The battery is connected a grounding resistance smaller detection resistors, let capacity check meter high impedance SRP and SRN input can monitor sensor resistance on both ends of the voltage. Through testing the current flows through a resistor can be used to judge the battery or release the amount of electricity. Designers choose detection resistance value must be considered when resistance on both ends of the voltage can't more than 100 mV, low resistance may be more hours in current errors. Circuit board layout must ensure that SRP and SRN to testing from as close as possible to the connection of the resistor sensor resistance end; In other words, they should be the Kelvin attachment.

HDQ pin need external and resistors, this resistance should be located the host or the main application, such capacity check plan to the battery and portable devices when sleep function enable connection broken. Advice and resistance choose 10 k Ω.

battery identification. A low cost WeiMao batteries are getting more and more serious, these cells may not contain OEM requirements of security protection circuit. So, genuine battery may contain figure 4 (a) shows the appraisal circuit. When to identify the battery, the host to contain IC (bq26150, the function is cyclic redundancy check (CRC)) issued the battery packs a ask value (challenge), the CRC will contain battery according to this inquiry value and, in the building of the IC in CRC polynomial calculation the CRC value. CRC is based on the host of command and IC secret in the query of the definition of the CRC polynomial completed, the host in CRC values calculated with the calculation result of well battery comparison to identify the appraisal success.

Once the battery through the appraisal, bq26150 will issue commands to ensure that the host and quantity test plan of material lines between normal communication. When the battery connection interruption or to connect, the whole the identification process will be repeated again.

double the battery application. Figure 4 (b) for use bq26500 support double the typical application of lithium ion battery circuit. In order to support more battery, and this circuit is adding a adjustable regulators. Capacity check millions of BAT pin and the bottom of a battery anode linked to complete the variable voltage measurement of the battery.

Host to be able to read capacity check plan of variable voltage measurement battery, to make sure the end of discharging threshold and charging terminate threshold. As for the remaining state power (RemainingStateofCapacity), do not need to read can use directly.

The above bq2650x and bq27x00 etc capacity check plan provides the battery manufacturer a simple to use options, this scheme L [just measuring battery voltage to be precise, so these capacity check plan can be applied to various battery framework, and can support the battery identification and double the battery application '

3.2 power detection algorithm is an example of applications another, can apply to all kinds of general voltmeter new IC.

Today's many manufacturers can provide a variety of voltmeter IC,, the user can choose the suitable function device, to optimize the product price. Use voltmeter measurement of storage battery parameters, the separate architecture allows users in the host custom power measurement algorithm within. Eliminating embedded processor battery cost. On this to Dallase semicconductor company called cases of DS2762 chip for typical analysis. A new separate voltmeter IC, its structure see chart 5 (a) below.

DS2762 application characteristics

DS2762 is a single quarter of lithium battery voltmeter and protection circuit, integrated into a tiny 2.46 mm x 2.74 mm inversion of packaging. Due to internal integration for power detection of high precise resistance, this device is very save a space. It is the small size and incomparable high level of integration, for mobile phone battery and other similar handheld products, such as PDA, etc, are all very ideal. Integrated protection circuit continuously monitoring the battery voltage, over voltage and flow fault (charging or discharge period). Different from the independent protection IC, DS2762 allow main processor surveillance/control protection FET conduction state, such, can DS2762 through the protection of the power system and the control circuit implementation. DS2762 can also charge a battery consumption has depth, when the battery voltage within three V, provide a limit of the charging current recovery path.

DS2762 accurate monitoring battery current, voltage and temperature, the dynamic range and resolution of common satisfy any mobile communication product testing standards. The measurement of current for internally generated when the integral, realize the power measurement. Through the real-time, continuous automatic disorders correct, the precision of power measurement can be increased. The built-in measuring resistance due to eliminate manufacturing process and temperature and cause resistance change, further improve the precision of the voltmeter. Important data stored in 32 bytes, can add the lock EEPROM; 16 bytes of SRAM are used to keep dynamic data. And DS2762 all communication all through the 1-Wire, more communication interface node, minimize the battery and the connection to the host. Its main features for; Single quarter of lithium battery protector; High precision current (power measurement), voltage and temperature measurement; Optional integrated 25 m Ω measuring resistance, each DS2762 after fine-tuning alone; 0 V battery restore charge; 32 bytes can lock EEPROM, 16 bytes SRAM, 64 a ROM;

1-Wire, node, digital communication interface; Support more battery power management, and through the protection system control FET power; Dormancy mode power supply current only 2 µ A (most); Work mode power supply current for 90 µ A (most); 2.46 mm x 2.74 mm inversion of packaging or 16 feet SSOP package led, and both are can choose with or without detection resistance; After has with e

2011-05-01

転載

誤字脱字は勘弁な。

I was at home the other night inth middle of my dinner when the phone rang.


ME:Hello.

AT&T:Yes, thie is AT&T...


ME:Thie is AT&T,

AT&T:Yes, this is AT&T.


ME:Is this AT&T.?

AT&T:Yes! This is AT&T, may I speak to Mr.Byron, please?


ME:May I ask who is calling?

AT&T:This is AT&T.


ME:OK, hold on.


At this point I put the phone down for a solid 5 minutes thinking that, surely, this person would have hung up the phone. I ate my salad. Much to my surprise, when I picked up the receiver, they were still waiting,


ME:Hello?

AT&T:Is this Mr.Byron?


ME:May I ask who is calling, please?

AT&T:Yes, this is AT&T...


ME:This is AT&T?

AT&T:Yes, this is AT&T...


ME:The phone company.

AT&T:Yes, sir.


ME:I thought you said this was AT&T.

AT&T:Yes, sir, we are phone company.


ME:I already have a phone.

AT&T:We aren't selling phones today, Mr.Byron. We world like to offer you 10 cents a minute, 24 hours a day, 7 days a week, 365 days a year.


ME:Now, that's 10 cents a minute, 24 hours a day?

AT&T:(getting a little excited at this point by my interest) Yes, sir, that's right! 24 hours a day!


ME:7 days a week?

AT&T:That's right.


ME:I am definitely interested in that! Wow!! That's amazing!

AT&T:We think so!


ME:That's quite a sum of money!

AT&TYes, sir, it's amazing how it adds up.


ME:OK, so will you send me checks weekly, monthly or just one big one at the end of the year for the full $52,560; and if you send an annual check, can I get a cash advance?

AT&T:Excuse me?


ME:You know, the 10 cents a minute.

AT&T:What are you talking about?


ME:You said you'd give me 10 cents a minute, 24 horus a day, 7 days a week, 365 days a year. Thats comes to $144 per day, $1008 per week and $52,560 per year, I'm just interested in knowing how you will be making payment.

AT&T:Oh, no sir. I didn't mean we'd be peying you, You pay us 10 cents a minute.


ME:Wait a minutes. how do you figure that by saying that you'll give me 10 cents a minute, that I'll give YOU 10 cents a minute? Is this some kind of subliminal telemarketing scheme? I've read about things like this in the Enquirer, you know.


AT&T:No, sur, we are offering 10 cents a minute for


ME:THERE YOU GO AGAIN! Can I speak to supervisor please?

AT&T:Sir, I don't think that necessary.


ME:I insist on speaking to supervisor!

AT&T:Yes, Mr.Byron. Pleas hold.


At this point, I begin trying to finish my dinner.


SUPERVISOR:Mr.Byron?

ME:Yeah.


SUPERVISOR:I understand you are not quite understanding our 10 cents a minute program.

ME:is This AT&T?


SUPERVISOR:Yes, sir, it sure is.

ME:(I had to swallow before I choked on my food, It was all I could do to suppress my laughter and I had to be Careful not to produce a snort.) No, actually, I was just waiting for someone to get back to me so that I could sign up fo the plan.


SUPERVISOR:Ok, no problem, I'll transfer you back to the person who was helping you.

ME:Thank you.


I was on hold once again and managed a few more monthfuls. I need to end this conversation. Suddenly, there was an aggravated but polite voice at the other end of the phone.


AT&T:Hello, Mr.Byron, I understand that you are interested in sighning up for our plan?


ME:No, but I was wondering - do you have that "Friend and Family" thing because I'm an only child and I'd really like to have a little brother...


AT&T:click.........

2010-06-25

仕事切り上げて

ゆっくりワインでも飲みたい

メール作法

How to Begin and End Email

Beginnings and endings are a challenge in most activities, but in email getting off to a good start and ending positively will strengthen the communication and increase understanding.

Start with a specific subject line.

Choose the better subject line in each pair below:

1. a. New Phones

b. New Phone Installation: Your Action Required

2. a. Update on Development of Sales Model

b. Status Update

3. a. Summer newsletter

b. 10 Great Tips for Summer vacation

In number 1, the second choice conveys a sense of urgency and action, whereas the first choice falls flat. In 2, the longer title focuses the reader on which update the email is explaining. In 3, you don’t really have much choice. Who would take a?

Next comes the greeting.

Examples:

Hello, Robin.

• Hi, Fred and Lauri.

• Hi, team.

• Greetings, everyone

• Good morning, Sayed. (If Sayed this message in the morning)

• Jian, we are looking forward to meeting you next week.

• To: Finance and Administration Team

• To all employees:

• David,

• Ruth, Mala and Felicia:

Dear Mr. Mathews

The last five examples must be on a separate line at the top of the message. All the others can be either a separate line or at the beginning of a paragraph.

Choose the greeting that matches your relationship with the reader(s) and the purpose of the message. “Hi” is friendly but too informal in certain situations—for example, in response to a request for a proposal. “Hello” is friendly and professional. “Hey”is too informal and slangy for most messages.

“To” followed by a pronoun like “all” or the name of a group sounds professional but does not convey warmth. Warmth is required in all messages, but please remember that you must always consider the position of the receiver.

Avoid gender-based greetings such as “Ladies.” Even if the group you are writing it is all women, some among them will object to this greeting.

Do not greet people whose name is included on the Cc line. Only greet people whose names are on the To line of the email.

The punctuation of greetings is a topic for discussion. All the punctuation used in the list above is correct. Some people use “Hi team” and “Hello Robin” without the comma, but traditional writers retain the comma. The reason is that these words are in “direct address.” When we directly address the reader, as in “Hi, team” (or in the example that begins with “Jian”) the name is separated from the other words by a comma.

Dear Mr. Mathews” is followed by a colon in a business letter and in an email that replaces a business letter. However, it is also acceptable to use a comma after a

Dear” greeting in a business email.

In a quick exchange of email with someone it is not necessary to continually greet your reader. Compare such an exchange with putting the person on hold on the telephone. When you return to the phone call, you say, “Thanks for holding. I have the information: rather than “Hi Laurie.”

The last sentence of an email is like the last words of a phone call. They may be a quick signoff or a courteous close, depending on the formality of the communication.

Examples:

• See you in Tokyo!

• Have a great trip!

I will email you in August to schedule lunch.

• Please call me again with any questions

Thanks again for all your help with the design.

• Thank you for your cooperation. We appreciate the opportunity to work with you.

Avoid continually using “Have a great day!” or similar expression as your closing sentence. It became meaningless with constant use and it is a bad fit with email that communicates a policy or serious announcement.

It is not wise to save a request for action or approval until the end of the message. Email readers do not read to the end of a message when they believe they have gotten the main point already.

A complimentary close—yes or no?

Business letters typicall end with phrases called “complimentary closes” such as “Sincerely yours,” “Best wishes,”and “Best regards.” A complimentary close is not required in email. However, business email often uses such a close to sound formal, look professional, or simply communicate courteously.

Examples:

• Sincerely,(the most formal of the list)

• Best regards, (professional)

• Warm regards, (professional and warm, as you would expect)

• Regards, (less friendly than the other 2 regards choices)

• With best wishes, (or) Best wishes, ( professional)

• With thanks, (professional and grateful)

• Ciao! (friendly and rather informal)

• Cheers, (friendly)

A word like “Greetings” does not belong in a close. It may be used in the last sentence, though, to greet others who might see the message:

• Please give our greetings to Dr. Carr

• Greetings to your colleagues in Systems Research

Although people frequently use “Thanksas a close, it is not standard, and careful writers avoid it. Do not use “Thanks in advanceas a close, because many people find it presumptuous. Rather than “Thanks” or “Thanks in advance,” create a better sentence, such asThanks for considering my request.” Or use “With thanksas a complimentary close followed by a comma.

Advice for those who receive less-than-perfect Email. You will sometimes receive email that is less than perfect, which means you might feel a bit offended by them. My advice to you on this is to get through them and leave them behind. Bring a bright smile to your face and a kind tone to your email reply. Forgive those whose writing was clumsy, abrupt, or annoying. They were merely experiencing moments of being human and imperfect.

 
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