Category: Science and Technology

Technology, abbreviated by science and technology, generally refers to human use of machines, hardware, or man-made utensils, but it can also contain a wider range of architectures, such as systems, organizational methodologies, and techniques.Science (English: Scientific, Greek: επιστήμη) is a subject that, through empirical evidence, is attributed to phenomena (originally referred to as natural phenomena, which now refer to phenomena such as social phenomena).The knowledge derived from scientific activities is clearly conditional, can withstand testing and cannot contradict any known facts within the scope of application. Science and technology is the main body of knowledge evolution, shaped by society or shaping society.The proliferation of new technologies, such as computers, has led people to believe that technology is the decisive force for social evolution, in other words, it is the spontaneous driving force that drives change.

  • When does the router DMZ host service need to be used?

    When does the router DMZ host service need to be used?

    Question: “Generally, when a computer connects to the Router, it will be assigned an intranet ip location, so why do you need the DMZ function?”

    The computer (server) side of the home router’s internal network needs to enable the Port forward/virtual server function to open PORT to external systems or users for connection, so that outsiders can connect to our designated system (such as Apache web server) ).

    However, if the IP address of the intranet computer is directly set to the DMZ host, the above setting is not required, and the port (port) channel of the computer can be designated one-to-one for external connection.

    Generally, this is also a function required by home routers, because there are still a few people who need to disclose their own transmission ports in the home area network, so this function is mostly only used for emergency use.

    Of course, the disadvantage of this is that the firewall protection of the router is missing, and the firewall needs to be manually set on the DMZ host to prevent hackers from intruding and destroying.

  • What are the restrictions on the Transparency film Paper on inkjet printer and laser printer?

    What are the restrictions on the Transparency film Paper on inkjet printer and laser printer?

    A common question with schools on stage reports, design uses, and making simple circuits is about “What are the restrictions on Transparency film Paper (slideshow) plastic transparencies on inkjet printers and laser printers?”

    Although with the advent of the digital age, traditional projectors are less and less used in classroom reports or business meetings, so many young friends may not even have seen the length of the projector, but in practice there are still many places where you will use this. Kind of transparent plastic projection film.

    For example, DIY hand-made screen printing (printable T-Shirt), design and layout exhibition and window layout, and even electronic production of printed circuit boards can also be exposed to light through the output circuit diagram.

    In order to prevent this kind of useful props from becoming obsolete and losing information on how to use them, especially the key points are recorded below.

    If you want to print transparencies, you need to consider which machine you will use for output. Both inkjet printer and laser printer have their own special transparencies, including:

    The transparencies used by laser printers are simply a thin piece of PET plastic. The laser printer uses high temperature to burn the toner on the surface of the transparencies to form a pattern, which is similar to fit into the surface of the plastic layer. The binding force is high and it is not easy to disperse with one touch.

    It should be noted that some models can be set to “special mode for transparencies”. Please remember to select this mode to reduce the temperature of the toner to avoid direct softening (or even micro-melting) of the transparencies in high-end models.

    The special transparencies for inkjet printers will be covered with a special coating on one side (rough operation, visually judged), which can uniformly absorb ink molecules to form patterns and has the characteristics of speeding up drying.

    There are two points to pay attention to when using inkjet transparencies. One is that the front and back of the inkjet transparencies are different. Using the wrong side (no paint surface, smoother) will make the dye unable to be fixed, and it will be smeared off with a simple wipe; It is an inkjet transparencies. Do not use them on laser printers! Because the special coating is melted by high temperature, once it adheres to the photosensitive drum of the laser printer, it can be a lot of money to send it for repair.

    If the print volume is not large and it is only a one-time small printing demand, you can directly take it to the common photocopying shops around the university campus to output to them, avoiding the situation of buying a large package of transparent transparencies at a time but not using it up (in the drawer of the author) There is still a big bag, but it’s good to use it occasionally. It can be used to spray paint or practice drawing, which is quite useful).

  • Why are the windows of airplane (aircraft) oval?

    Why are the windows of airplane (aircraft) oval?

    When traveling abroad and taking an airplane (aircraft), I often feel puzzled. Why are the cabin windows all small and oval in shape?

    In fact, the aircraft cabin windows in the early years did not limit the shape, but with the advancement of science, scientists found that with the improvement of flight ability, rectangular windows can no longer afford high-performance flight mode, and the pressure will be concentrated on the four corners of the rectangular windows. As long as the pressure accumulates to a certain value, it may break the aircraft and even cause an accident of disintegration in the air.

    The elliptical window has also been confirmed by scientists that this shape can best evenly share the internal and external pressure difference stress. Therefore, aircraft manufacturers in the industrial age will naturally develop aircraft designs that best meet the definition of safety to make flying safer. The cabin windows of modern aircraft are basically oval-shaped (unless a local tyrant spends a lot of money to use a fighter-grade glass structure, which is an exception to the situation where it is to be rectangular).

  • Who is the first person in the world to propose that moonlight comes from the reflection of sunlight?

    Who is the first person in the world to propose that moonlight comes from the reflection of sunlight?

    A question related to earth sciences and cosmic astronomy today is “Who is the person who first proposed in the history of the world that the moon’s lunar system comes from the sunlight (also known as sunlight) reflected from the sun?”

    “Anaxagoras”, born in Athens, ancient Greece in 500 BC, was an ancient Greek philosopher, scientist and astronomer who brought philosophy to Athens and influenced Socrates’ thought.

    Anaxagoras found that the moon is soil, closer to the ground than the sun, and has no light. Moonlight comes from the sun and is blocked by the moon to form lunar and solar eclipses. However, because his astronomy violated the religious beliefs of the Athenians at the time, he was charged with disrespect for gods.

    Therefore, the world generally believes that the first person in history to propose the theory that moonlight comes from the reflection of sunlight is the ancient Greek scientist.

    However, in a very old Chinese book on astronomy and mathematics, “Zhou Li Suan Jing”, it has actually mentioned the description of “Moonlight is born in the sun”: “The sun is like fire, the moon is like water, and fire is outside. Light and water contain the scenery, so the moonlight is born in the sun, the soul is born in the sun, the day is shining, and the sun is full. (Recorded in Erya Commentary Volume 6)”, in other words, ancient scholarship of that era The phenomenon and concept of moonlight coming from sunlight have been widely known in the world.

    Although “Zhou Ti” has no definite writing date, it is rumored that it was written by Zhou Gong, and Zhou Gong died in 1032 BC, much earlier than the time of Anaxagoras above. There is also a saying that “Zhou Tu Suan Jing” was written in the late Western Han Dynasty.

    During the Han Dynasty, there was a debate in front of the emperor. It was recorded as follows: “A famous official objected to Zhenwei, thinking that “moon light was born in the light of the moon and the sun.” It has nothing to do with the loss of the Tao,” and these contents all come from the knowledge of the ancient Scriptures scholar in the Han Dynasty, which means that the ancient texts of the Han Dynasty have shown that the moonlight comes from the sun.

    In addition, the ancient Ming character “朙” was first recorded in ancient books handed down from the Han and Song dynasties. For example, the “Hou Han Ji· Juan Shou” has written “… Zhen Yuxun’s talents, wisdom, and economics are enough to be described by Jia Shi as the great…” and other texts.

    In the book “Shuowen Jiezi” written in the Eastern Han Dynasty, the meaning of the word “朙” was taken from the moon to the 囧. The genus of all 朙 is from 朙. Ming Dynasty, the ancient literature from Japan. Wubing cut. According to the explanation of Shuowen Jiezi Annotation, “…from the moon. Those who follow the moon, the moon takes the light of the sun as the light….” It can also be found that the ancient character “朙” already has the meaning of the moon taking the sun as light. Meaning, even the ancients specially designed such an ancient word.

    To sum up, although we cannot be sure whether the actual writing date of “Zhou Tu Suan Jing” was in the Western Han Dynasty, it does not matter whether it is “Zhou” in the title of the book or Zhou Gongdan (the Zhou Dynasty politician) and Shang Gao mentioned in the article. (Mathematicians of the Western Zhou Dynasty, the study of the Pythagorean theorem was 500 to 600 years earlier than the Pythagorean theorem (also known as the Pythagorean theorem)), the names and dialogues of Rong Fang, Chen Zi, Lu, etc. can almost be It is determined that this is a piece of content that appeared more than a thousand years ago, well before the time of Anaxagoras in Athens, Greece.

    Therefore, if you want to talk about the first specific person who proposed that moonlight comes from the sun and has written records, it can barely be regarded as the Greek “Anaxagoras” in 500 BC; however, there are written records, but it is impossible to determine The earliest publication of a specific author is the Chinese “Zhou Tu Suan Jing” more than a thousand years ago.

  • Drill bit sizes and anchors, Gecko screw quick selection table

    Drill bit sizes and anchors, Gecko screw quick selection table

    Today’s question is about power tools “drill bit size and quick selection table of expansion screws, screw the Gecko”!We are particularly common drill bit sizes are listed, and anchor screws (including outside, outside casing screws, expansion screws sleeve anchor, expansion screws, flat head casing with flat head screws and flat Gecko) corresponding size into the quick comparison table below.

    Drill bit sizes

    • Half: 1/16 inches, equals 1.5875 mm.
    • 1 min: 1/8 inches, equals 3.175 mm (3mm).
    • 1 and a half minutes: 3/16 inches, equals 4.7625 mm.
    • 2 points: 2/8 inches, equals 6.35 mm (6.5mm).
    • 2 and a half minutes: 5/16 inches equals 7.9375 mm (8mm).
    • 3 points: 3/8 inches, equals 9.525 mm (9.5mm).
    • 3 and a half minutes: 7/16 inches equals 11.1125 mm (11mm).
    • 4 points: 4/8 inches, equal to 12.7 mm (about 12.7mm).
    • 4 and a half minutes: 9/16 inches, and is equal to 14.2875mm (about 14.3mm).
    • 5 points: 5/8 inches, equals 15.875 mm (16mm).
    • 5 and a half minutes: 11/16 inches equals 17.4625 mm (about 17.5mm).
    • 6 points: 6/8 inches, equal to 19.05 mm (about 19.5mm).
    • 6 and a half minutes: 13/16 inches, equals 20.6375 mm.
    • 7 points: 7/8 inches, equals 22.225 mm (22mm).
    • 7 and a half minutes: 15/16 inches, equals 23.8125 mm.
    • 8 points: 1 inch is equal to 25.4 mm (about 25.4mm).

    Expansion (sleeve) screw/anchor screws and drill bit quick comparison table:

    • 2 expansion (sleeve) screws (outside), you can use the 2 minute drill bit (6.5mm).
    • 2 and a half minutes expansion (sleeve) screws (outside), you can use 3 bits (9.5mm).
    • 3 expansion (sleeve) screws (outside), you can use 4 bits (12.7mm).

    Further reading/recommendations Appendix:

    1. Common size conversion table quickly: 1 ~ 8 separate is equal to a few millimeters (mm)?
  • Tesla (Tesla) components/Taiwan supply chain vendors

    Tesla (Tesla) supply chain components/Taiwan listed below, from the power control, motor rotor to Taiwan information system consisting of built-in components.

    Tesla (Tesla) power management

    • Wei: power control system.
    • Delta: the power supply components.
    • Jian XING: charged shot.
    • UT: power cable harness.
    • Dimension fit: power the system power cord.

    Tesla (Tesla), body control and built-in applications

    • Xiang instrument: electric door.
    • Seitoku: more than 40 kinds of fasteners (screws, screw).
    • And: gear guns.
    • Toda, and dareglobal: motor stator and rotor.
    • Yi Jia: mechanical components.
    • Chen Hong, group: 17-inch touch panel.

    Data source: Bureau of Economic Affairs industrial (2017).

  • Mainland reporter's street visit Dame's ' Talk about Ma Yun's unmanned supermarket '

    Reporter: Ma yun launched the unmanned supermarket, what do you think? Dame: So what?There's no one in the supermarket, so why not close the door? Reporter: Dame, the unmanned supermarket is not no one meant that, but said that there is no salesperson cashier and so on staff in the supermarket. Dame: That should be called no staff supermarket Ah!Hey, as far as your language level is, what about being a journalist? Reporter: Yes, dame is right, should be called no employee supermarket.Ma ' am, what do you think of this new type of supermarket? Dame: Supermarkets don't need to raise staff. Is that something cheaper? Interviewer: This?We haven't learned about it for the time being. Dame: Look how you journalists did it.The common people are most concerned about the problem, you do not understand, all day will only care about Ma Yun and what thing.What are the most concerned about our common people?Whether there is a fake, is not cheaper!Is there any staff in the supermarket, what's the matter with me? Interviewer: Don't you think the launch of the unmanned supermarket will change our traditional way of shopping? Dame: What's changed?It doesn't cost money to buy anything?Brush Alipay That's also spending money! Reporter: Ma ' am, it seems that you still can not understand the trend of the development of the Times. Dame: Yo, is it the trend of the times to get a supermarket without employees?What's the ability to get some stuff that specializes in cutting the bottom employees every day?Got a knack for getting a supermarket without a boss?Why don't you get a government without a civil servant? Reporter: Ma ' am, do you have a problem with Ma Yun? Dame: I do not have a problem with Ma Yun, is to you this kind of boring reporter has the opinion, asks the question never asks to the point.Ma Yun has changed our lives, but we want not just change, but changes that bring about happiness.Now a lot of changes not only do not add to our happiness, but also add a lot of trouble!That's what you journalists should be concerned about. Reporter: (halo)

  • Why OPPO, the mystery handset maker, easily beat Xiaomi and Apple?Economist Analysis gives you the marketing mystery among them!

    Earlier, because the Chinese Republic of China legislator Chen Opper in the establishment of the question stage a joke, think that the manufacturer plagiarized his name copyright, instantly let A in Taiwan originally unknown intelligent mobile phone manufacturer OPPO (Opel) widely known (by the way, to copy is also copied Chen father, Chen Mother's copyright).A few years ago, oppo and Vivo were obscure smart handset makers, but Economist beat Apple and Xiaomi in their home market with a full grasp of trends, the latest issue of The Economist wrote in particular. So today let's follow The Economist's introduction and take a peek at the magic company that has taken the first place in the 2016 cities in mainland China [II]!The Economist's reference is as follows: As a South China city close to Hong Kong, Dongguan's more famous goods are a variety of cheap jewelry, rather than high-end equipment.However, in the midst of the dust, there is a low-flying factory with a sparkling halo that produces 50 million smart phones a year for Oppo-a company founded by step High Electronics [III], but is now operating independently. Inside the plant, in addition to the usual assembly lines and dense laborers, there are dozens of employees in quality engineering and product control testing who are responsible for conducting 130 different tests before the Oppo mobile phone is officially brought to market.Such stringent quality requirements are inevitably reminiscent of Apple's handset foundry, a world-class plant built by Foxconn in nearby Shenzhen with a similar team. But what is different is that the company specializes in producing relatively inexpensive handsets for the Chinese local market. Oppo and his sister company, Vivo, were founded in 2004 and 2009 by step High, and, like a large number of unnamed Chinese manufacturers, they are producing inexpensive mobile phones.The two companies have not even received Apple's attention at all, and Xiaomi is Apple's serious problem in the Chinese market: attracted by viral marketing, with experienced city dwellers snapping up sophisticated handsets produced by the company. But in June 2016, Oppo R9, which sells for about $400 trillion, sold more than twice times its own iphone, making it China's best-selling handset.Vivo, who targets young groups with a low-priced strategy, has also risen strongly. Both brands have done a great success.Two years ago, it was hard for them to be among China's top five smart handset makers, but now they are in the five in the world.In the third quarter of 2016, 1 of the 3 smart phones sold in China came from the two brands, while in 2012 their combined share was less than 3%. This should arouse Apple's vigilance.Tim Cook, the company's CEO, had expected China to become its biggest market in 2013.But iphone sales in the Chinese market have stagnated, with market share falling to 7.1% in the third quarter of 2016, well below the 11.4% per cent a year ago. Xiaomi has more reason to feel restless.About 6 years ago, the company heavily bet on the light asset model, selling mobile phones almost entirely through online channels.At a time when the overall market size of smart mobile phones is growing, this model does work well, especially in large cities with strong scientific and technological awareness among ordinary consumers.Xiaomi's valuation once reached $46 billion, but the company's fortunes in the Chinese market have plummeted. The main reason for this change is that market growth has shifted dramatically to the middle class in small cities.Consumers there are less aware of smart phones than big cities such as Beijing and Shanghai, and have concerns about online shopping.They want to be able to touch and contrast different phones with their own hands. Oppo and Vivo noticed the difference early on.Oppo quickly occupied the market because it had opened many physical retail stores in small and medium-sized cities by investing heavily.Today, the company's mobile phones are available in about 200,000 retail stores in mainland China, which also gives salespeople the opportunity to reach out to customers and persuade them to buy more expensive phones. Oppo's strategy was originally orchestrated by step High founder Duan Yongping, who started by selling simple electronics.With a keen sense of smell in financial markets and a strong admiration for stock God Buffett (who had a chance to have lunch with Buffett for more than $600,000 trillion in 2007), he has a reputation as a "Geffite" in China.Although Duan Yongping has retired, he is still influencing the culture of these companies. Because Xiaomi's internet strategy has been a great success, it is not easy to be tempted by such a strategy.Many companies are trying to imitate Xiaomi's model.Insiders revealed that since 2011-2013, Oppo has seriously considered how to expand online sales channels, but ultimately decided to give up.Li Bingzhong, head of Oppo's international mobile operations, said it stemmed largely from the company's long-standing adherence to the "duty." As a result, Oppo put more effort into motivating physical retailers.The company has shown a willingness to share more profits with retail channels.They use a complex system of subsidies to adjust the amount according to different patterns and seasons.A retailer in a small town in Sichuan said that despite his sale of many brands of smart phones, the generous subsidies offered by Oppo made it more willing to market the company's products. The practice also clearly comes at a cost: Oppo does not disclose the size or profitability of the company's subsidies, which are likely to be lower than those of other smart handset makers.China's smart mobile phone market, though huge, is struggling to make big profits.From the design of components and chipsets to OEM production, it is easy for companies to outsource all production processes, leading to a low threshold for the mobile phone industry – However, the physical retail network set up by Oppo and Vivo is far more difficult to replicate than online channels. Many enterprises are bound to trigger a fierce price war, especially in the cheap mobile phone market.Analysts believe the price of smart phones in China could fall to $50 trillion. The pressure of the local market is an important reason why Chinese enterprises are expanding into the international market.In the fourth quarter of 2016, Xiaomi and Vivo competed for the throne of the second-largest smart handset brand in the Indian market (Samsung came in first).Local telecoms equipment giant Huawei already has two-fifths of its sales coming from overseas, and its consumer business executive, Shao Yang, said it would rise to three-fifths per cent in 5 years. Oppo has moved into the Indian market and became the second-largest smartphone brand in Southeast Asia after Samsung.The company also built a new marketing center in Cairo with a view to expanding markets in Africa and the Middle East. Kevin Wang of Kevin Wang Markit, a market research firm, believes the smart phone industry will face a round of consolidation.He predicts that most of the more than 50 handset makers in mainland China will disappear within 5 years.If Oppo and Vivo can stay at their peak, they are no less surprised than their high-speed rise.

    Extended Reading/Appendix:

    1. Product Reference: OPPO R11S Intelligent Mobile phone.
    2. Idc:top five Smartphone vendors in PRC, shipments, he, and year-over-year growth, 2016 preliminary Data (Units in millions).
    3. Guangdong Step High Electronics Industry Co., Ltd.: R & amp; d Company, headquartered in Dongguan, Guangdong Province, the company's size of 15 to 50 people, the company's website is "www.vivo.com.cn".
    4. Guangdong Europa Mobile Communications Co., Ltd. (OPPO): R & amp; d based Enterprises, the main focus on intelligent mobile phones (Mainland China is also known as smartphones) and accessories, headquartered in Shenzhen, Guangdong Province, the company's size of more than 2000 people, the company's Web site is "www.oppo.com".
    5. Original reference article: Moby Whale Forum.
  • Have you been cheated today?Scam group's usual technique list hot out!

    The Criminal Police Department recently published a statistical report, in response to the occurrence of (105) years of fraud cases, found that the people most often suffer from the fraud of the top three in order: “Fake friends and relatives in the name”, “ATM to lift the installment setting” and “fake online shooting.”

    Fraud tactics first place “fake friends and relatives in name”

    This is the main approach of the scam group in recent years, gangsters steal people line, Facebook and other accounts, impersonating himself to the list of friends to send a message, ask friends and relatives for money relief, or random gun shooting, ask each other “Guess Who I am?””When the victim says 1 names, he will impersonate his people and borrow money from the victims.” Police said it was ” Fake relatives and friends in the name of “Although is old terrier, the number of cheated from the 3rd place in 104 years rose to the 1th place last year, the police particularly remind the public, when receiving friends and relatives to borrow money, must be in person or telephone confirmation of identity, if received friends and relatives with strange number calls to borrow money, but also with the old contact way to Line, email mailbox, Facebook and other account data, so as to avoid account theft, harm friends and relatives into a scam trap.

    “ATM relieves installment setting” ranked second

    As a result of the rise of online shopping, people go online to buy things, send meals, booking and other life patterns have become the norm, but some sites do not have good security measures, by hackers to steal people’s capital and transaction data, and then tamper with the call number, impersonate customer service and bank personnel falsely claim that the transaction was mistakenly set as a continuous deduction, The people are required to operate atm”to lift the installment setting”, the opportunity to cheat money to succeed, but in fact ATM can only “withdraw” and “remittance”, does not have the function of lifting settings, identity verification and so on.

    Third place, “fake racquet.”

    Fraud Group to see the people want to pick up a cheap mentality, in the auction site or Facebook community to launch less than the market price of goods, such as buyers after ordering remittances to sever contact.Police advise people to choose a web-shooting platform with a secure trading mechanism, avoid private transactions, and keep all transactions and talk data in case of a dispute. There have also been recent one-page shopping sites that use Facebook Ads to promote specific items, most of which use long single pages to promote products and leave only buyer data and cash on delivery.These site sellers can not track the source, often from mainland China taobao with cheap prices, and then through the way of large-style advertising with high prices to sell to the public, advised people to pay more attention, do not leave data in such unknown sites and buy goods. The criminal Police Department warned the public that although there are many technology fraud tricks, but “thousands of deception, can not be separated from the atm”, but also for the ” Cash on delivery “shopping style to pay more attention to, gangsters mostly use the people’s lack of verification and greedy cheap mentality, the people in the enjoyment of online transactions and intelligent mobile phone to bring convenience, but also to strengthen their own sense of fraud prevention, the use of ATM transactions before the need to reconfirm the identity of the other party, as well Help.