Bitcoin fell from more than 300 dollars to a few cents
Since the birth of bitcoin, its price has risen from a few cents to a maximum of $20000. Although it has dropped a little, it has soared to $18000. This price surprised many people. Why is bitcoin such a virtual digital currency so valuable< the quantity of bitcoin is limited, so the price is relatively expensive. Because bitcoin can be anonymous, many people use bitcoin to hide property or trade. The speculation of bitcoin players leads to the high price of bitcoin First, the number of bitcoin is limited, so the price is relatively expensive< p> Bitcoin is a decentralized virtual digital currency, and bitcoin is generated based on algorithm, so the total amount of bitcoin will not exceed 21 million, and with the increase of mining population, bitcoin will be less and less, so the price of bitcoin is more expensive than other virtual currencies{ RRRRR}
the reason why bitcoin is valuable is that it has replaced part of the currency function and some people have speculated. If you have any other opinions, please leave a message to discuss
It's hard to say that the value of bitcoin depends entirely on other digital currencies. Many digital currencies anchor the rise and fall of bitcoin. Moreover, although bitcoin itself limits the number of issues, its lower limit is wireless issuance. Compared with the most popular 21 million, it has been issued nearly 100000 times. Moreover, it lacks supervision, Its price is completely controlled by some capital parties and teams, becoming a tool for capital to harvest leeks
according to my estimation, the value of bitcoin will continue to rise, and it will continue to be issued, which is equivalent to a big plate. In order to attract more people into the pit, bitcoin must rely on the rise to attract investors, and then harvest through the control panel. This can also be seen from the rise and fall of bitcoin in the past five years, And the change of funds< br />
About 400 percent
when bitcoin first appeared in 2009, one dollar could buy almost 1300 bitcoins. Before April 2011, the price of each bitcoin was always below $1. In June 2011, the highest price of bitcoin rose to $30. Then, the price almost fell within a week. In 2012, the price of bitcoin once fell below $2
further dropped to $114 on January 14, 2015. Since then, bitcoin has begun to rise again. In 2017, after the bitcoin ETF fund was rejected by the US Securities Regulatory Commission, bitcoin plummeted by $315 to below $1000. After that, it rose again. In the first four months of this year, the price of bitcoin and an ounce of gold were almost equal
However, with the strong rise of bitcoin in this round, the price of bitcoin has exceeded the price of an ounce of gold. On April 26, the price of bitcoin was $1282.97, compared with $1264 for an ounce of gold. Bitcoin has surpassed gold in price
extended data
in 2016, there were dozens of bitcoin exchanges in the world, and the trading volume of bitcoin in most countries and regions increased sharply. Among the countries and regions with the highest growth rate, the trading volume of bitcoin in Japan is second only to China, ranking second in the world; The local bitcoin trading volume in Venezuela increased by more than 913%
South Korea has become the sixth largest bitcoin trading market in the world, Korean people can buy bitcoin from a large number of convenience stores, and korbit's trading volume currently accounts for 70% of the South Korean market; Local bitcoin transactions in Colombia increased by about 370%; Bitcoin markets in Malaysia, Russia and Australia are also developing rapidly. Bitcoin trading in China once accounted for more than 80% of the global trading volume
1. Take close-up pictures of small still objects, such as flowers, birds and insects:
use AV file, the aperture should be f5.6 or below, the focal length should be more than 50, and try to shoot within 1m to make the background virtual
if the light is good, ISO 100, if the light is bad, ISO should be within 400<
2. Shooting people:
basically use a large aperture (within f5.6) and a focal length of more than 50 mm. The shooting distance depends on the whole body, half body and big head, which makes the background virtual. Use AV file
good light, iso100, bad light, iso400
people in motion use tracking to reflect the sense of motion (see the shooting of moving objects below for details)<
3. Shooting:
AV file, use the appropriate aperture, above F8, the focal length is arbitrary, but generally the wide-angle end has distortion, use it as appropriate<
4. Shooting night scene:
upper tripod, AV gear, custom white balance or incandescent lamp, aperture above F8, small aperture can make the light proce starlight effect, use the reflector pre rising function to rece the vibration caused by the reflector lifting after pressing the shutter; And cover the viewfinder with the square cover on the strap to prevent stray light from entering from the back and affecting the image quality; ISO 200, as far as possible to make the exposure time longer, so that some people who have no intention to walk away from the screen disappear, leaving no traces, clean the scene
for example, when taking a square with people coming and going, you can use a very small aperture of about F20 and iso100. In this way, the exposure time will be very long, and the moving figures will not stay in the photos! The square will be clean<
5. Shooting fireworks:
using shutter line and B shutter, you can shoot multiple fireworks overlapping effect<
6. Shooting things:
when the light is good: AV, the aperture size should be handled according to the circumstances; Large depth of field can be obtained by using aperture above F8, and shallow depth of field can be obtained by using small aperture
if you want to have a very dynamic effect, you can use the TV gear, the shutter is about 1 / 30, when you focus and press the shutter, the lens will follow the object at an appropriate speed, which will proce a very dynamic effect
poor lighting: we can only handle it according to our own discretion, plus use the follow-up camera<
7. Shooting running water or fountain:
using TV and about 1 / 50 shutter speed, you can shoot Satin effect. If you use too fast shutter speed, the fountain will shoot discontinuous water drops<
8. Taking photos at night:
use tripod to adjust white balance, and automatically or custom white balance; iso100-400 AV gear, aperture about F8, use slow synchronous flash, rear curtain flash mode; At this time, the flash will flash twice, press the shutter to flash once, and flash again before the end of exposure, so don't leave before flashing twice
in this way, the characters can be clear and the background neon is beautiful, so that the background will not be too dark e to insufficient exposure< No matter what you shoot, don't shoot with the maximum aperture unless you want to keep a safe shutter
2. Please use the aperture of F8 ~ F11 as much as possible when shooting scenery
3. The maximum aperture can be reced by 1-2 levels when taking close-up of people and still life
4. The safety shutter should be controlled above the reciprocal of the focal length as far as possible. The wide-angle shutter should also be more secure at more than 1 / 30 second. If the shutter is insufficient, please increase the aperture or ISO<
metering method:
1. Don't measure the light to the sky or the darkest place. Go to the middle value
2. According to your subject matter, make good use of the metering mode (balance metering, point metering, central key metering...)
3. If the light measurement is not accurate, please use AE lock to expose and lock the gray things around you before shooting
4. Try not to measure the light on white or black objects, otherwise remember to rece eV for black and increase eV for white<
EV is exposure compensation.
exposure compensation is also an exposure control method, which is commonly used in ± If the ambient light source is dim, the exposure value (such as + 1eV, + 2eV) can be increased to highlight the clarity of the picture
most of the small digital cameras adjust the exposure compensation through the menu
in the process of shooting, if you press half of the shutter, the LCD will display pictures similar to the final effect picture, focusing and exposure will start. The exposure at this time is exactly the exposure of the final picture. If the picture is obviously bright or dark, it means that the automatic metering accuracy of the camera has a large deviation, and the exposure compensation should be enforced, but sometimes the brightness displayed ring shooting is different from the actual shooting result. Digital camera can browse the picture immediately after shooting, at this time, you can more accurately see the brightness of the picture, there will be no difference. If the shooting result is obviously bright or dark, it is necessary to re shoot and force the exposure compensation
the shooting environment is dim, and the brightness needs to be increased. When the flash cannot work, the exposure can be compensated and the exposure can be increased appropriately. For exposure compensation, if the photo is too dark, increase the EV value. Every 1.0 increase in EV value is equivalent to doubling the amount of light intake. If the photo is too bright, decrease the EV value. Every 1.0 decrease in EV value is equivalent to doubling the amount of light intake. The compensation interval can be adjusted in 1 / 2 (0.5) or 1 / 3 (0.3) units according to different cameras
when the white object to be photographed looks gray or not white enough in the photo, it is necessary to increase the exposure. In short, "the whiter the object is, the more white the object is." this seems to run counter to the basic principles and habits of exposure. In fact, it is not. This is because the main body of the camera is often the center of the light measurement, and the White main body will make the camera mistakenly think that the environment is very bright, As a result, the exposure is insufficient, which is also a common problem for most beginners
because the shutter time or aperture size of the camera is limited, it is not always able to reach the 2eV adjustment range, so the exposure compensation is not omnipotent, and it may still be underexposed in too dark environment. At this time, it is necessary to consider cooperating with the flash or increasing the ISO sensitivity of the camera to improve the brightness of the picture
generally speaking, the smaller the brightness contrast of the scene, the more accurate the exposure, otherwise, the larger the deviation. The grade of the camera is high and low. If the grade is high, the metering is more accurate, and if the grade is low, the deviation will be increased. If it is a traditional camera, the tolerance of film is relatively large, and the exposure deviation will not have a big problem within a certain range, but the CCD tolerance of digital camera is relatively small, and slight exposure deviation may affect the overall effect
in a word, the adjustment of exposure compensation is determined by experience and sensitivity to color. Users must compare the image quality, clarity, restoration degree and noise size under different exposure compensation to get the best picture
note:
the aperture in Canon's manual refers to the F value. The larger the aperture, the greater the depth of field
generally speaking, aperture refers to aperture, which is inversely proportional to F. the larger the aperture, the smaller the depth of field
AV -- aperture priority auto exposure
TV -- shutter priority auto exposure
AE auto exposure
AF auto focus
AF-S -- single auto focus, the same as saf. The opposite is continuous autofocus
MAF - monitor AF, which can shorten the focusing time. The camera will adjust the focus before half pressing the shutter button, so that you can compose with the adjusted focus. When the shutter button is half pressed and AF locking is completed, the focus will be locked
ev - exposure value, which is usually used in exposure compensation
ISO sensitivity. Each difference of sensitivity is equivalent to the corresponding exposure value of aperture or shutter
brother, if you have time, go to ZhongGuanCun video forum and see the forum.
the reason why many people drink (whether they are alcoholic or not) is to change their bad mood
this way of drinking in order to get rid of the painful feeling is called "evasive drinking". Thousands of A.A. members know that when we are in high spirits, we often like to drink. If we look back on our past drinking experience, most of us can see that we are used to celebrating by drinking when we are in a high mood
based on the previous drinking habits, we put forward another suggestion: pay special attention to the happy and jubilant time. When everything goes well, it makes us feel like we may not be alcoholics. Please note that! At that time (even after years of waking up), the idea of a drink seemed perfectly natural
we forget the sad memory of drinking in the past for the time being, so it should not be a big problem to have only one drink. Then we began to think that drinking was not so serious or even harmful. For normal people, a glass of wine is certainly not a problem. But from our past drinking process, we can clearly conclude how serious the impact of this seemingly insignificant glass of wine on people like us will be
sooner or later, we will convince ourselves that it's OK to drink one more drink, and then we want to drink two more... Happy drinking is especially attractive for us. We have good reasons to celebrate, and we are in a group of happy relatives and friends who are drinking or can drink, Their drinking behavior seems to bring us a certain degree of social pressure, encouraging us to join the ranks of drinking
perhaps because of our traditional social customs, we often have the habit of drinking in weddings and funerals
therefore, even if we realize that we no longer need to drink, the deep-rooted idea still remains in our hearts. There are many ways to get rid of the social pressure of drinking. Please refer to Chapter 26 for advice. We have to remind ourselves that there are no exceptions that allow us to "get rid of" alcohol addiction
no matter we have any reason or no reason at all, at any time, once we start drinking again, our disease will immediately worsen again
for some of us, the urge to drink seems to be stronger when we are happy, regardless of whether we are on special festive occasions or whether we are under the influence of social pressure
this feeling can happen at the most unexpected moment, and we may never understand the exact reason
we now know that when we have the idea of drinking, we don't have to panic. After all, in today's modern society, it's natural for anyone to have the idea of drinking, especially for us "heroes in wine"
however, the idea of drinking a glass of wine does not necessarily mean the desire to drink. There is no need to feel depressed or afraid. We might as well regard it as a warning to the risk of alcoholism, which reminds us of the harm of alcoholism
danger is forever, even when you feel incredibly good
one A.A. member recalled that when alcohol addiction fell to the bottom, there was an idea that lingered all the time: "I firmly believe that disaster is coming to me," she explained. "Every morning, almost my first thought is always, God! I don't know what kind of blow I'm going to encounter today. "
when someone knocks on the door, she is quite sure that nothing good will happen. She thought that all the letters she sent were bills and bad news, and there was always a sense of disgust when the phone rang
many of us are quite familiar with the situation where most of our mental energy is consumed by negative emotions. We all remember that in the period of heavy drinking, the mind was full of depression and darkness
this situation may be purely caused by alcohol depression, once the resial alcohol in the body is removed, the problem will be solved naturally. But some of us may continue this sensitive, melancholy mode of thinking until we detect it and pull it out carefully
no specific medicine can make us carefree and happy from now on. We can't assume that all the difficult challenges are meaningless, and we can't deny that each of us has to deal with the mountain of urgent problems from time to time. But depression, like other kinds of pain, does us great harm
however, we don't drink now, and we have a certain control over our own thoughts. Our consciousness is no longer vague, we have a broader field of thought
the mode of thinking we choose is crucial to our mood swings in the next 24 hours, so we may decide that today is a sunny day or a gloomy day
because our excessive drinking in the past has such a profound impact on our thoughts, it is very worthy of our in-depth and careful inspection to readjust our thinking habits, so as to use our thinking ability in a better way
the following examples may not be entirely applicable to you, but even if the events are not the same, you may feel the deja vu emotional ups and downs that happened to them
although some parts exaggerate to emphasize their views clearly, and some parts may be insignificant at first sight, after repeated verification, we find that even simple and small changes can lead us to a good starting point for rehabilitation
when our beloved child falls down accidentally ring the toddler stage and is injured, we will immediately check whether he is injured, whether the injury is serious or whether he is frightened
at this time, we are faced with a choice. We can scream hysterically because the child is hurt or frightened; Or we can keep calm and look at it rationally, thankful that it has not caused more serious harm. When our 90 year old grandfather died of a long illness, we faced the same situation
we can choose to insist that the only thing we can do is to show extreme grief and sadness, inlge in this kind of emotion, and maybe drink again; Or we are not only deeply sad, but also think that he has lived a long, beautiful and happy life, and we do care and honor him all the time. Now his illness and suffering are finally over. If we use this as an excuse to hurt our body, it will be very difficult for us to get his approval
when we finally have the chance to go to a place we have been looking forward to for a long time, we can complain about the inconvenience of the weather and accommodation, or miss the good old days. In fact, we only have days or weeks off. Or we can be grateful that we finally have the chance to realize our dream, which adds a good memory to our hearts
in response to any more optimistic, positive and positive remarks, we will notice that we tend to blurt out "yes, but..." a friend who is lucky, or looks quite young, or participates in the charity publicity activities of political and business celebrities, etc., will ince us to make an almost hostile and acrimonious response: "yes, But... "Is our habitual
mode of thinking beneficial to ourselves or others? Can we make good things simple? Can we just praise rather than belittle? People who try to quit smoking know that there are two possible outcomes: (1) constantly complaining about how difficult it is to quit smoking, "it still won't work this time" and "you see, damn it, I light another cigarette."
or (2) when we want to smoke, we should enjoy the deep breathing without smoke smell and freedom. We are glad that we haven't smoked for another hour. Even when we start to smoke again unconsciously, we encourage ourselves to put out the cigarette. Fortunately, we don't smoke the whole cigarette and only have cigarette butts
if one of us goes to buy a lottery with the first prize of 50000 yuan, he will win the prize of 500 yuan. Our sensitive mindset is easy to be teased, and wise people can easily find a balance. They don't need to feel aggrieved because they don't get the biggest prize. We can constantly find opportunities to make similar choices. Past experience makes us more convinced that maintaining a grateful attitude is not only beneficial to our physical and mental health, but also helps us to maintain a sober life
we will be surprised to see that as long as we make some efforts, it is not difficult to develop a grateful attitude. Many of us are reluctant to try to change. Although most of us are forced or forced at first, the effect is obvious. At the beginning, it's hard to resist the sarcastic and sarcastic tone that we are used to, which is unavoidably disturbing and confusing
we may have to hold back twice in a row in order to squeeze out a mild and positive word, which we call a kind expression
but it will soon become very easy to do, and will become a strong and pleasant support force in our rehabilitation process
we will understand that life means to enjoy, and we can enjoy life well
looking back on the history of drinking, we are controlled by a negative and negative emotion, which is also a behavior pattern that we must learn to change
if we can make some changes in our words and deeds, we can bring dynamic changes, and then adjust and improve our mood
for some reason, we often spend a lot of time thinking, paying attention to
and talking about other people's faults and problems (no matter whether other people's situation is true or not, it has nothing to do with the ideological transformation we are going to carry out now)
for some people, at first they began to try this change with a bious and indecisive wait-and-see attitude. We assume that others may be right. Before our rash judgment, we stop arguing, listen carefully and wait for the result. Whether our views are correct or not is not the focus of this chapter
no matter what the conclusion is, at least we have temporarily got rid of the framework that we always insist that we are always right and superior. When we are able to face our faults calmly without being bothered, we can find that sincere expression of "I don't know" can rejuvenate us, and saying "I'm wrong, you're right" can refresh us
we relax and accept new ideas with an open mind and gratitude. Top scientists are especially interested in new evidence that can prove their theories wrong
on March 12, the price of bitcoin fell to US $3800
if you want to pay attention to the price fluctuation, you can check it directly on the market software, which is more timely than the information you get by asking questions.
