What is electronography and what is the principle of electrons?

It should be biased towards weak electricity.

with the same valence electrons.

Molecules or ions with the same number of atoms have the same structural characteristics, and this principle is called the isoelectronic principle, and molecules, ions, or clusters of atoms that satisfy the isoelectronic principle.

It is called an isoelectron.

The "equality of electron numbers" in the equielectron principle can refer to the equality of the total number of electrons (e.g., Co and N2, both 14) or the equality of the number of valence electrons (e.g., N2 and Cn-, both 10).

Thus, particles that are equal to each other can be molecules or ions. Note that the term "equal number of atoms" in the isoelectron principle usually refers to heavy atoms (atomic number.

4) the number is equal; If the number of valence electrons is counted equally, the total number of valence electrons at this time includes the valence electrons provided by the heavy atom (atomic number 4) and the electrons used by the light atom (H, He, Li) to bond with the heavy atom, such as N2 and C2H2 are 10 electrons to each other.

Judgment method. Replace an element in a given particle with an element of the same group of oranges. Such as:

1) Determination of the isoelectrons of CCL4: the IVA group elements are SiCl4, GeCl4, etc.; The VIIA group elements include CF4, CBR4, CCI4, CFCL3 and ....... At the same time, there are SIF4, SIFCL3 ...... for Yuanhuai Bridge.

2) Isoelectron determination of CO2:

You can replace the O atom with the S atom to get COS and CS2, note: the C atom cannot be replaced with the Si atom because the structure of CO2 and SiO2 is different (the former is a molecular crystal, the latter is an atomic crystal). Similarly, the isoelectrons of BeCl2 cannot be identified as MgCl2 or Bef2 (the latter two are ionic crystals and atomic crystals, respectively).

The isoelectron principle refers to the fact that molecules or ions with the same total number of atoms and the same total number of valence electrons have the same structural characteristics (stereostructure and chemical bond type), and their state properties are similar.

The isoelectron principle refers to two or more molecules or ions that have the same number of atoms and the same number of electrons, often with similar electronic structures, similar geometric configurations, and sometimes many similarities in properties.

Application of the principle of electrons:

1. Determine the spatial configuration of some simple ions or molecules;

2. Use the similarity of isoelectrons in properties to make new materials;

3. Use the principle of isoelectrons to find isoelectrons for a substance.

Electronic Science and Technology is a major that belongs to the discipline of engineering.

The main goal of this discipline is to train electronic engineers with practical ability and innovative spirit, and their work scope includes electronic equipment research and development, communication network construction, information security management, integrated circuit design and manufacturing, intelligent control systems, power electronics technology and other fields.

In the study of electronic science and technology, students need to systematically master the basic knowledge and operation skills of electronic plug parts, understand the basic theories and design methods such as digital circuits, analog circuits, communication principles, etc., and master the basic principles and skills of electronic materials and electronic manufacturing processes, and be able to carry out electronic engineering practice and engineering technology research. To this end, the electronic science and technology major also requires students to master laboratory skills, computer application skills and other knowledge.

The development of electronic science and technology has broad prospects, so this major is also attracting more and more attention from students and society. In view of the continuous development of electronics and communication technology, the employment prospects of this major are also improving. In today's increasingly digital social environment, the development prospects of electronic science and technology are still full of challenges and opportunities.

Electronic Science & Technology Benefits:

1. Broad employment prospects: Electronic devices and technologies are increasingly widely used in various fields of society, so the employment prospects of graduates of this major are very good.

2. Preferential treatment: Practitioners in this field are often able to obtain considerable salaries and benefits, for example, the average salary level of electronic and communication engineers is usually higher.

3. Broad development prospects: In today's era of rapid development of informatization, electronic science and technology still have great development prospects in the future.

4. Innovative: Electronic science and technology involves cutting-edge technology, and in order to make achievements in this field, it is necessary to have high professional quality and innovation ability.

5. Strong adaptability: The application of electronic science and technology is very diverse, and graduates can engage in different practical work fields such as communication, automation control, information security management, embedded system design, etc. At the same time, in the field of electronic technology research, there are many areas that can be focused on waiting for research, discovery and application.

Electronic Science and Technology is a very good profession that has many benefits for graduates' future careers and development.

Electronic informatics is mainly to learn the basic knowledge of circuits and master the methods of processing information with computers, etc.

First of all, it is necessary to have a solid knowledge of mathematics, and the requirements for physics are also very high, and mainly in electricity; It is necessary to learn many basic courses such as circuit knowledge, electronic technology, signals and systems, computer control principles, communication principles, etc.

To learn electronic information engineering, you also have to design, connect some circuits and combine them with computers to conduct experiments, and the requirements for hands-on operation and tools are also relatively high. For example, I use my own circuits to connect sensors, I use a computer to set up a small communication system, I visit the electronic and information processing equipment of some large companies, and I understand mobile phone signals and cable television.

The development of electronic informatics is a precedent to the spring

1. Internet of Things technology.

With the rise of the Internet of Things, electronic information engineering will face more challenges in connecting devices and data management. Technologies such as wireless sensor networks, IoT communication protocols, and edge computing will be the focus of research.

2. Artificial intelligence and big data.

The combination of electronic information engineering and artificial intelligence will promote the development of intelligence and automation. Technologies such as machine learning, deep learning, and data mining will play an important role in areas such as image recognition, speech processing, and intelligent decision-making.

G and communication technology: The commercialization of 5G technology will bring higher data transmission rates and lower latency, further promoting the development of wireless communication and mobile Internet. At the same time, technologies such as optical communications, satellite communications, and radio spectrum management will also be further researched and applied.

4. Communication field.

The application of electronic information engineering in the field of communication has broad prospects. The development of technologies such as wireless communications, fiber optic communications, and mobile communications will lead to faster, more reliable, and more secure means of communication. At the same time, the rise of 5G and the Internet of Things will promote the development of areas such as smart cities, smart transportation, and smart homes.

5. Signal processing and image processing.

With the continuous development of digital signal processing and image processing technology, the application prospect of electronic information engineering in the fields of medical failure resistance, security, image recognition and virtual reality is huge. The development of technologies such as audio signal processing, codec, and image enhancement will improve the quality of life and productivity of the respondents.

Interpretation of electrons.

electron]

An elementary particle that makes up an atom with an extremely small mass and is negatively charged and revolves around the nucleus of an atom Detailed Explanation A type of elementary particle that makes up various atoms with an extremely small mass and is negatively charged and revolves around the nucleus in an atom.

Decomposition of Words Explanation of Electricity Electricity (electricity) à a physical phenomenon, an energy that can be obtained by chemical or physical methods to make a lamp glow, mechanically turn, etc.: electricity. Electrical energy.

The electric chain starts hot. Radio station. On a rainy day, the light emitted when the clouds in the air are discharged:

Lightning. Thunder. Refers to the telegram:

Power. Message. Refers to the telegram:

Interpretation of Invitation Zi ǐ In ancient times, it referred to children, but now it refers specifically to sons: children. Offspring.

Heir. Children (juniors, young people). Fruits, seeds of plants:

Shed let the vegetables. Melon seeds. Zishi.

Eggs of animals: roe. Silkworms.

Young, small: chickens. Newborn animal.

Sub-city. Small, hard, granular stuff :

<> solution When the V voltage source acts alone, the 9A current source is open, as shown in the figure above.

The 5 resistor is connected in series with the 1 resistor, and the current is i'，uab=（5+1）i'=6i'。

3 The resistor current is: 6i'/3=2i', according to KCL, the resistance current is: 2i'+i'=3i'。

kvl：4×3i'+6i'+2×3i'=27，i'=。

A When the current source acts alone, the 27V voltage source is short-circuited.

Let 2 the resistor current be i, and the other resistor currents are obtained according to KCL, as shown in the figure above.

Closed loop above, according to KVL: 5i"+1×（i"+9）+3×（i"-i+9）=0。

Simplification: i=3i"+12。

In the closed loop below: i-9=3i"+12-9=3i"+3；i"-i+9=i"-3i"-12+9=-2i"-3。

So: 2 (3i"+12）+4×（3i"+3）=3×（-2i"-3）。

Solution: i"=。

3. Superposition: i=i'+i"=。

Another solution is to simplify the circuit equivalence by using the power supply equivalent transformation.

The Y-shaped connection in the diagram is equivalent to the connection method:

Then: r12=r1+r2+r1 r2 r3=3+1+3 1 2=

r23=1+2+1×2/3=11/3（ω）r31=2+3+2×3/1=11（ω）

R23 is connected to 9A current source in parallel, equivalent to: 9 11 3 = 33 (V) voltage source, series R23.

Node 3 is used as a common ground, and the potentials of node are u1 and u2. List the junction voltage equations:

Node 1: (u1-27) 4+(u1-u2) 5+(u1-u2) r12+u1 r31=0;

Node 2: (u1-u2) 5+(u1-u2) r12=(u2-33) r23.

Solve the system of equations: u1=24v, u2=.

So: i=(u1-u2) 5=(.

— The simplest way: Thevenin's theorem.

Disconnect the resistor r=5 from the circuit.

4 is connected in series with 3 resistors, and the current is i, then: 2 resistor current is (i+9).

kvl：（4+3）×i+2×（i+9）=27，i=1（a）。

So: uoc=uab=uao+uob=3i-ubo=3 1-9 1=-6(v).

Short circuit of voltage source, open circuit of current source:

req=rab=（4+2）∥3+1=3（ω）

Thevenin's theorem: i=uoc (req+r)=-6 (3+5)=.

Electrician: This discipline belongs to the category of science and engineering, engineering and technology disciplines. As for what to learn, that's a lot.

There are basic knowledge, professional basic knowledge, professional knowledge, and professional knowledge, and the basic knowledge of the major should be learned: mathematics (advanced mathematics, probability, linear algebra), college physics. Professional basic courses: circuits, modular electricity, digital electricity, microcomputer principles, signals, electromagnetism, automatic control, modern physics...

Electronics: Electronics is a science and technology with applications as its primary purpose. It mainly studies the properties and behavior of electrons, as well as the physics of electronic devices.

Electronics involves many scientific disciplines, including physics, chemistry, mathematics, materials science, etc. Electronic technology is the science of applying the principles of electronics to design and manufacture circuits and electronic devices to solve practical problems.

i2=(10-6)/8= (a)

i3=10/10=1 (a)

By the Node Current Law:

i1=i2+i3-4-1= (a)

The power emitted from the 10V voltage source is:

p=10·i1=-35 (w)

This voltage source emits -35W, i.e. absorbs 35W.

Electrical Engineering and Electronics is a book published by Tsinghua University Press in 2012, and the author is Zhu Dinghua. This book mainly expounds the basic theories, basic knowledge and basic skills necessary for electrical and electronic technology.

<> solution When the V voltage source acts alone, the IS is open, above.

rab=（3+3）∥（8+8）=6∥16=48/11（ω）

Trunk current: us (3+rab)=6 (3+48 11)=22 27(a).

So: UAB = (22 27) rab = (22 27) (48 11) = 32 9(v).

i'=uab/（8+8）=（32/9）/16=2/9（a）。

2. When IS acts alone, the US is short-circuited, as shown in the figure below.

The abc in the left figure is equivalent to the Y-shaped joint, and the right figure is transformed. where r=3 3 (3+3+3)=1( ).

is connected in series r=1, equivalent to the current source is=1a.

Because the two branches connected in parallel with the current source are (8+1), so: i"=-is/2=-1/2=。

3. Superposition theorem: i=i'+i"=2/。