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1. Two kinds of charge, charge conservation law and elementary charge: (E = 1.60) × 10^-19C The charge quantity of charged body is equal to the integral multiple of element charge
2.
{F: force between point charges (n), K: electrostatic force constant, k = 9.0 × 10 ^ 9N · m ^ 2 / C ^ 2, Q1, Q2: electric quantity of two-point charges (c), R: distance between two-point charges (m), direction on their connecting line, force and reaction, mutual repulsion of the same kind of charges, mutual attraction of different kinds of charges}
3. Electric field intensity: e = f / Q (definition formula, calculation formula, electric field intensity is its own property, independent of electric field force and electric quantity)
{e: electric field intensity (n / C), electric field intensity: e = f / Q (definition formula, calculation formula, electric field intensity is independent of electric field force and electric quantity)
{e: Electric, 4. Electric field formed by vacuum point (source) charge e = KQ / R ^ 2 {R: distance from source charge to the position (m), Q: electric quantity of source charge}
5. Electric field strength of uniform electric field E = UAB / D {voltage between two points of UAB: ab (V), D: distance between two points of AB (m)}
6. Electric field force: F = Q * e {F: electric field force (n), q: The electric quantity (c), e: electric field strength (n / C)}
7. Potential and potential difference: UAB= φ a- φ b，Uab=Wab/q=- Δ EAB / Q
8. Work done by electric field force: WAB = Q * UAB = EQ * d
{WAB: work done by electric field force from a to B (J), Q: charge (c), UAB: potential difference between a and B in electric field (V) (work done by electric field force is independent of path), e: uniform electric field strength, D: distance between two points along the direction of electric field strength (m)}
9. Electric potential energy: EA = Q* φ A {EA: electric potential energy (J) of charged body at point a, Q: electric quantity (c), φ a: The potential (V) of point a}
10 Δ EAB = EB EA {the difference of electric potential energy of charged body from position a to position B}
11 Δ EAB = - WAB = - Q * UAB (the increment of electric potential energy is equal to the negative value of electric field force)
12. Capacitance C = q / u (definition formula, calculation formula) {C: capacitance (f), Q: electric quantity (c), u: voltage (potential difference between two plates) (V)}
13. Capacitance C of parallel plate capacitor= ε S/4 π KD (s: the opposite area of the two plates, D: the vertical distance between the two plates, ε： Dielectric constant)
common capacitors
14. Acceleration of charged particles in electric field (VO = 0): W= Δ EK or Qu = MVT ^ 2 / 2, VT = root sign (2qu / M)
15. Deflection of charged particles entering uniform electric field with velocity VO along the direction of vertical electric field (without considering the effect of gravity)
vertical electric field direction of quasi horizontal parabolic: uniform linear motion L = VOT (in parallel plates with equal heterogeneous charges: e = u / D)
parallel electric field direction of motion: uniform acceleration linear motion with initial velocity zero, d = at ^ 2 / 2, a=F/m=qE/m

A prominent feature of the college is that it has more advanced modern experimental equipment at home and abroad. The laboratory covers an area of nearly 2800 square meters, with complete equipment for material analysis, performance testing and material instruments. The laboratory is divided into material micro detection and analysis laboratory, metallographic laboratory, high frequency laboratory, metal anti-corrosion and protection laboratory, mechanical properties laboratory, polymer material laboratory, heat treatment laboratory, chemical analysis laboratory, nondestructive testing laboratory and domestic first-class welding experimental teaching base. The advanced material testing instruments and equipment at home and abroad mainly include: transmission electron microscope (JEM-2000EX), scanning electron microscope (jsm-5500lv), energy spectrometer (focau2, EDAX company), X-ray diffractometer (D-max Ⅱ a), direct reading spectrometer (PDA-7000, Shimadzu company) Electro hydraulic servo dynamic and static fatigue testing machine (Shimadzu, Japan), electronic universal tension and compression testing machine, ceramic cathode ion coating machine (mh-800), X-ray flaw detector, metallographic quantitative analysis optical microscope, optical microscope (mm-6, Germany), ion sputtering instrument (kykykysbc-12), coating machine (jee-4x, Japan), ion thinning instrument (gl-69d), TGA / DSC synchronous thermal analyzer, etc Multi purpose impact testing machine, various hardness tester, plasma thermal spraying equipment (US 3710), high frequency heat treatment equipment, metal surface anti-corrosion equipment, vacuum melting furnace, vacuum sintering furnace, ultra-thin slicer (Leica company), various wear testing machines, various heat treatment testing equipment, various advanced welding equipment, Fourier transform infrared spectrometer (US Nicoli), etc Laser particle size analyzer (USA), spark plasma sintering machine (Japan), vibrating sample magnetometer (USA), METTLER precision densitometer (Switzerland), resistance meter (at512), etc
in the teaching work, the college pays attention to the teaching mode of combining basic theory learning with experimental operation and proction application, and attaches great importance to the experimental teaching of undergraates. Generally, laboratories and experimental instruments are open all day without restriction, and each undergraate is required to have more than 15 hours of modern large-scale instrument experimental courses (compulsory experimental courses include: transmission electron microscope, scanning electron microscope, scanning electron microscope, etc.), Energy spectrometer, X-ray diffractometer, electro-hydraulic servo fatigue testing machine, direct reading spectrometer, etc.), especially ring the graation thesis, students are allowed to use a large number of these modern large-scale instruments. This is difficult for other universities in China to achieve
the welding laboratory can provide 70 students for welding test at the same time, equipped with all kinds of advanced welding equipment, welding wire and other consumable materials are basically unlimited
this shows that the goal of the college to cultivate students is not only to require students to have professional theoretical knowledge, but also to have excellent practical ability. We should pay attention to the heuristic interactive teaching method and the cultivation of students' ability to analyze and solve problems independently, pay attention to the vivid multimedia teaching, and pay more attention to the cultivation of students' innovation ability. We should encourage students to participate in Teachers' research group, improve students' awareness of combining theory with practice, and improve students' practical ability. Encourage students to go deep into factories and mining enterprises for professional research and participate in technological research activities, and encourage students to carry out professional technological innovation and invention activities. It has formed a three-dimensional learning atmosphere from classroom to society, from experimental skills to engineering application. After graation, the students can become useful talents in society. The graate enrollment rate of the college is relatively high. The employment rate of graates in successive years is more than 95%, and the employment satisfaction rate of graates in successive years is more than 80%
apart from focusing on students' professional learning, the college also attaches great importance to students' Ideological and political ecation and organizes a variety of colorful extracurricular activities. Adhere to the ecational concept of "learning higher cultural knowledge, first learn to be a person of noble character". So that students can consciously strengthen moral cultivation, profound concept of honor and disgrace, strictly require themselves with college students' code of conct, create a strong learning atmosphere, cultivate the spirit of integrity, friendship, unity and cooperation
the college organized the summer social practice activities of college students who go to the army, rural areas, communities and factories as an important part, and has been awarded the title of "excellent team" of social practice at provincial and municipal levels for successive years, and has won the title of "advanced collective of double support work for the 20th anniversary of joint construction" of Changchun University of technology
relying on the "Challenge Cup" College Students' extracurricular scientific and technological works competition, the college actively enhances students' innovation consciousness and improves students' practical ability. In the college students' extracurricular scientific and technological works competition, the college has won one third prize of the Eighth National "Challenge Cup", one provincial special prize, one first prize, two second prizes and two third prizes. Through the activities, students' interest in professional learning has been greatly improved, and the style of study of the college has also been promoted
the college has made great progress in scientific research in recent years, and has successively established university level research institutes (research centers) for materials technology and equipment engineering, welding materials and technology, material surface engineering technology, polymer synthesis and application, etc. The college has carried out extensive instry cooperation with foreign countries, and established "R & D base of metal material processing engineering" in Tonghua Iron and steel group; In Jilin Ferroalloy Co., Ltd., the "R & D base of alloy material technology and energy saving engineering" was established; In Siping gostar nano manufacturing equipment Co., Ltd., a "R & D base for manufacturing process and application of metal nano materials" has been established. It has also established various forms of cooperation with large enterprises in Beijing and other places, Tsinghua University, Institute of metals of Chinese Academy of Sciences, Key Laboratory of automotive materials of Jilin University, Tokyo University of technology and Northeast University of Japan, FAW Group of China, Jihua company, Changke group, Tonggang group, Jilin Oilfield company, Anshan Iron and steel company, Zhejiang and other institutes and enterprises
the academic atmosphere of the college is active and the scientific research achievements are fruitful. In the past three years, more than 200 scientific research papers have been published, and more than 50 have been retrieved by SCI, EI and ISTP; It has undertaken more than 40 national, provincial and ministerial level scientific research projects with an average annual scientific research fund of more than 4 million yuan; Eight provincial and ministerial level scientific and technological achievements awards and 12 patent inventions have been won. The promotion of achievements has created about 90 million yuan of economic benefits for the society. Among them, "low carbon low alloy Air Cooled Bainitic Steel" has been successfully used as truck front axle, and its fatigue life has reached and exceeded the index of similar procts in Japan In this project, non quenched and tempered process is used instead of quenched and tempered steel to improve proction efficiency and rece proction cost "Isothermal normalizing process and proction line for alloy carburized billet" has passed the national achievement appraisal and been approved as a national key new proct The localization of IF steel plate for deep drawing parts of cars has created better economic benefits in the light weight of automobile steel plate The surface of the material was modified by laser cladding technology, which created direct benefits of more than 12 million yuan for FAW Group. In addition, a lot of achievements and application results have been obtained in the preparation and application of mineral machinery wear-resistant materials, aluminum, magnesium, titanium alloys, metal compounds, ceramics, functional alloy materials, nano materials, plasma spraying and surfacing composite materials, etc