The phenomenon that the intensity of emission spectrum and absorption spectrum is weakened compared with the original radiation energy of lower energy level due to the original absorption of steam around the luminescent layer is called self-absorption.
The self-absorption phenomenon makes the spectral lines disappear seriously, which is called self-etching.
Can EDS detect Na? 1, EDS is used to test the content of some elements, and XRD is used to test the crystal structure. 2. Energy dispersive spectrometer (EDS) analysis is a kind of equipment connected with scanning electron microscope or transmission electron microscope.
Will there be belay phenomenon in lru algorithm? There will be no delay exception in LRU permutation algorithm;
In the first-in-first-out (FIFO) algorithm, the loading sequence of each page can be represented by a linked list. The performance of FIFO is poor, because the pages called in earlier are often frequently visited pages, which are repeatedly called in and out under FIFO algorithm, and there is the phenomenon of Belady. The so-called Belady phenomenon refers to the abnormal phenomenon that when using FIFO algorithm, if all the pages needed by a process are not allocated, sometimes the number of allocated pages will increase, but the page missing rate will increase.
Are there 46 grams of Na and 32 grams of O in 78 grams of Na2O2? 106 gram Na2CO3 contains 46 grams of Na element, and the C element is ...
Is Na+ a Na element? Na+ is sodium.
The difference between ions and atoms is that ions gain or lose a certain number of extra-nuclear electrons, most of which are the outermost electrons.
Is there a phenomenon of half-opening wheat in Lan concert? There is a saying that Sue's black voice was recorded in advance. According to several concerts I have watched, Su should be a real singer. Both moa and yui were half-open in the early days, and they have been open recently.
I have never been to the scene, but from the DVD and sound, it is really whole wheat.
5X 10 catches up with the heavy rain (well, it will rain as long as our group is in the open air). Because the wheat was flooded, Nino's solo suddenly stopped in the middle. At the scene of the 2065 438+0 1 FNS accident, Wheat didn't make a sound. It was really singing, but it was also really laughing and jumping, although it was a little out of tune.
There is no self-priming pump in the second stage. When the single-phase motor of self-priming pump is led out of the power line, there is a phenomenon of positive and negative connection (positive and negative rotation).
What are the phenomena in contemporary society? The decision of the Sixth Plenary Session of the 16th CPC Central Committee pointed out that "at present, our society is harmonious on the whole. However, there are also many contradictions and problems that affect social harmony, mainly: urban and rural, regional, economic and social development is very unbalanced, and the pressure on population, resources and environment is increasing; Employment, social security, income distribution, education, medical care, housing, safety in production, social security and other issues related to the vital interests of the masses are more prominent; The system and mechanism are not perfect, and the democracy and legal system are not perfect; Some social members lack honesty and moral anomie, and the quality, ability and style of some leading cadres do not meet the requirements of the new situation and new tasks; Corruption is still serious in some areas; The infiltration and sabotage activities of hostile forces endanger national security and social stability. " If these problems are not handled well, it will seriously affect the overall situation of economic and social development, social harmony and stability and building a well-off society in an all-round way. The causes of these prominent contradictions and problems affecting social harmony are complex and multifaceted, which can be summarized as follows: first, some structural contradictions and imbalances that have existed for a long time in economic and social development; Second, the problems arising from the imperfect system and mechanism in the process of system reform; Third, the problems caused by the relatively backward social development in the rapid economic development. Generally speaking, China is harmonious at present, which is a basic estimate of the current social situation. However, we should also be soberly aware that various social contradictions and social problems that affect social harmony at this stage are complicated. Often, the problems caused by unbalanced economic and social development are intertwined with the problems caused by the imperfect institutional mechanism of system transition, the problems left over from history are intertwined with new problems, the problems of practical interests are intertwined with the problems of ideological differences, and the problems caused by bureaucracy and improper working methods are intertwined with the problems caused by the infiltration and destruction of hostile forces. These problems restrict economic and social development, and if left unchecked, they will dampen the enthusiasm of the broad masses of people to participate in building a well-off society in an all-round way. We should fully implement Scientific Outlook on Development, persist in taking economic construction as the center, put building a harmonious socialist society in a more prominent position, and gradually solve these problems in deepening reform and all-round development.
Sodium is one of the most common alkali metals, which not only plays an important role in human body. In addition, sodium metal is also widely used in cutting-edge technology and daily life.
We know that rockets are needed to send satellites into the sky and launch space shuttles and missiles. How do we determine the position of the launched rocket in the air? This requires the help of sodium steam. After the rocket is launched, the sodium vapor released in the atmosphere can produce bright orange clouds, from which scientists can determine the position of the rocket in the air and calculate the gas density at the rocket mouth. At present, people have been able to use atomic energy to generate electricity, which has many advantages. An important device needed for atomic power generation is an atomic reactor. In the process of atomic fission, the temperature in the reactor will rise very high due to the release of huge energy, so it is necessary to export heat to cool the reactor. What acts as a heat conductor (coolant) is sodium-potassium alloy (containing 20% ~ 50% sodium). This alloy is liquid at room temperature and has better thermal conductivity than solid metal, so it is an ideal thermal conductivity agent for atomic reactors.
Sodium is an active metal with strong reducibility and a good reducing agent. Therefore, it is used as reducing agent in industry to prepare some rare metals, such as titanium and zirconium. These metals are widely used in aerospace industry.
Submarines and breathing masks need oxygen. As an oxygen supply agent, sodium peroxide can directly react with carbon dioxide to release oxygen. The industrial preparation of Na2O2 is to melt sodium by heating, introduce a certain amount of dry air to remove CO2, and then increase the amount of air and quickly raise the temperature to 300℃ ~ 400℃ to obtain Na2O2.
In daily life, sodium is also widely used, such as sodium lamp (high-pressure sodium lamp) used to make monochromatic light source. This kind of lamp emits yellow light, with long range, strong fog permeability and high road illumination, and is widely used to make indicator lamps and street lamps. In addition, sodium can also be used as a catalyst for synthetic rubber and a desulfurizer for petroleum.
Since the new case of quality education