1. In semiconductor physics, p represents the type of semiconductor doping in a material that is loaded with leptons (such as electrons). Semiconductor material is a kind of material whose electron configuration allows electrons to move freely in its energy band structure, and its properties depend largely on its doping level and type.
2, P type semiconductor, that is, the hole concentration is much greater than the free electron concentration of impurities semiconductor;N-type semiconductors are impurity semiconductors in which the free electron concentration is much greater than the hole concentration.
3, P type semiconductor "P" means Positive, taken from the first letter of the English positive. The "N" of N-type semiconductor means Negative electricity, taken from the first letter of the English negative.
4, because the semiconductor and the doped trace elements are electrically neutral, and the doping process neither loses charge nor gets charge from the outside world, but there is a large number of moving electrons or holes in the semiconductor, and does not destroy the balance of positive and negative charges in the entire semiconductorState. P-type semiconductors, also known as hole semiconductors.
1, the triode PCR606J plays the role of amplification and switching. The transistor is in a semiconductor substrate to produce two PN junctions very close to each other, the two PN junctions divide the whole semiconductor into three parts, the middle part is the base region, the two sides of the part is the emission region and the collector region, the arrangement of PNP and NPN two kinds.
2, chip thyristor is a new type of thyristor class, is in the original technology will be controllableThe silicon wafer is packaged on a small frame (usually referred to as the patch form), so that the occupying surface on the PCB board becomes small, and the cost volume becomes lighter and smaller.
3, such as: for protein function research, gene amplification of high-grade PCR instrument, electrophoresis instrument and some intelligent precise temperature control of constant temperature instrument incubator; It is used to develop scanning probe microscopes with special temperature platforms.
4, the BPCR of the drug reached 90%, and the drug was metabolized in the swelling, mainly for the reduction of C4-5 double bonds to single bonds and C3 ketogroup to hydroxyl. It is then combined with glucuronic acid or sulfuric acid and excreted in the urine. Be worthNote that cortisone and prednisone need to be hydrogenated in the liver to hydrocortisone and prednisolone (hydroprednisone) to be effective.
5, the effect on the blood and hematopoietic system: glucocorticoid can stimulate the hematopoietic function of the bone marrow, so that the content of red blood cells and hemoglobin increase. Effect on the central nervous system: can improve the excitability of the central nervous system. Effect on digestive system: glucocorticoids can increase the secretion of gastric acid and pepsin, improve appetite, and promote digestion.
1, P type semiconductor, that is, the hole concentration is much greater than the free electron concentration of impurities semiconductor; N-type semiconductors are impurity semiconductors in which the free electron concentration is much greater than the hole concentration.
2, so in this semiconductor, the number of electron carriers is very large, the main kao electronic conduction, called electronic semiconductor, referred to as N-type semiconductor. [P-type semiconductor] "p" means positive charge. In this kind of semiconductor, the main part of the conduction is the positively charged holes, which come from the "acceptor" impurities in the semiconductor.
3, [N-type semiconductor] "n" means negative electricity, in this type of semiconductor, involved in conduction is mainly negatively charged electrons, these electrons from the "donor" impurities in the semiconductor. The so-called donor impurity is that the inclusion of impurities can provide conductive electrons and change the conductive properties of the semiconductor.
4, P means that there is a lack of electrons on the PN junction, and the material that conducts electricity mainly by holes is also called P-type material; N means that there are excess electrons on the PN junction, and the materials that conduct electricity mainly by electrons are also called N-type materials. P-type semiconductors are carriers dominated by holes, and N-type semiconductors are electrons