Centaur star mining strategy
lof fund is an innovative fund, which combines the advantages of open-end fund and closed-end fund. Lof fund is an open-end fund in essence, but it can be traded in real time just like closed-end fund. Lof funds can be purchased either in the primary market or in the secondary market. Primary market refers to the transactions between fund companies and fund investors. Secondary market refers to the transaction between fund investors and fund investors. There is a big difference between the two. The primary market includes direct sales of fund companies, sales by banks and sales by fund companies. The secondary market refers to the securities exchange market, which needs to open shareholder cards in securities companies to buy. Boshi's theme is in Shenzhen stock market. In the primary market, you take an integral multiple of 1000 yuan to purchase, and then calculate your share according to the net value of the day. In the secondary market, you can buy 100 shares at real-time price. In front of the primary market is the subscription fee, which is generally about 1.5%. In some places, there is a 40% discount. The front of the secondary market is called Trading Commission, which is generally 0.3%.
TOF, time-of-flight mass spectrometry, a very common mass spectrometer. The mass analyzer of this mass spectrometer is an ion drift tube. The ions proced by the ion source are collected first. In the collector, the velocity of all ions becomes zero. A pulsed electric field is used to accelerate the ion into a field free drift tube and fly to the ion receiver at a constant speed to record the arrival time and abundance of each ion
The application ofin environmental monitoring mainly includes the following aspects:
particle classification: the chemical composition can be characterized according to the mass spectrum characteristics of particles, and the narrow aerodynamic diameter of particles can be used to classify particles; At the same time, the size and chemical composition of particles can be classified; The corresponding relationship between main chemical components and particle size was established
The change of particle number concentration with time was analyzed; It can be analyzed that the number concentration of different particle diameter ranges changes with time in the detection rangeanalysis of chemical composition and its change with time: analyzing the change of certain chemical composition with time can accurately reflect the special change in a certain time according to its change trend; It is particularly important to realize the real-time online analysis of particulate matter and heavy metals, which is an irreplaceable method at present
source apportionment: according to the classification and time change of particulate matter, the possible source was determined
Research on the evolution process and mechanism ofparticles: according to the evolution trend of different particles with time, the possible formation mechanism can be inferred
extended data
time of flight mass spectrometer can detect large molecular weight range, fast scanning speed and simple structure. The main disadvantage of this time-of-flight mass spectrometer is its low resolution. Because the initial energy of ions leaving the ion source is different, the time for ions with the same mass charge ratio to reach the detector has a certain distribution, resulting in the degradation of resolution
one of the improved methods is to add a group of electrostatic field mirrors in front of the linear detector to push back the ions in free flight. Because of the high initial speed, the ions with large initial energy have a long distance to enter the electrostatic field mirror and a long distance to return, while the ions with small initial energy have a short distance to return, so they will focus at a certain position of the return distance, So the resolution of the instrument is improved
this kind of time-of-flight mass spectrometer with electrostatic field mirror is called reflection time-of-flight mass spectrometer
According to the technical route, it can be roughly divided into two categories, one is TOF (time of flight) radar, the other is trigonometric ranging radar. The principle of triangulation is that the laser emits the laser, and after irradiating the object, the reflected light is received by the linear CCD. Because there is a distance between the laser and the detector, according to the optical path, objects with different distances will be imaged at different positions on the CCD. According to the trigonometric formula, the distance of the measured object can be deced. The principle of TOF is that the laser emits a laser pulse, and the timer records the outgoing time. The return light is received by the receiver, and the timer records the return time. The "flight time" of light is obtained by subtracting two times, and the speed of light is fixed, so it is easy to calculate the distance when the speed and time are known. Triangle method is limited by the scheme, and its performance is still inferior to that of TOF lidar. If you want to know about lidar procts, you can browse the official website link of Shanghai Star second Optoelectronic Technology Co., Ltd
structured light usually uses an invisible laser with a specific wavelength as the light source. The light emitted by TOF has encoded information and is projected on the object, Through a certain algorithm to calculate the distortion of the returned coding pattern to get the position and depth information of the object
time of flight of light (TOF) is a method to measure the time of flight of light to get the distance. In short, it emits a processed light, which will be reflected back when it touches an object, capturing the time of back and forth. Because the speed of light and the wavelength of molated light are known, the distance to the object can be calculated quickly and accurately.