Refrigeration equipment HS code checks

List of the contents of this article:

• 1, You can use () to represent the curve of the evolution and development of the technical system.
• 2 、Refrigeration equipment HS code checks' title='What are the evolution rules of triz's eight technical systems?' > What are the evolutionary laws of triz's eight major technical systems?
• 3, The root cause of the evolution of technical systems
• 4, The principle of co-faced evolution of celestial systems
• 5, How to view the system evolution tree
• 6, How to analyze the system evolution tree

You can use () to represent the curve of the evolution and development of the technical system.

1. The S-shaped curve can be used to represent the curve of the evolution and development of the technical system.

2. An S-shaped curve can be used to represent the curve of the evolution and development of the technological system. Data expansion: the curve is one of the main objects of differential geometry research. Intuitively, the curve can be regarded as the trajectory of the movement of the slippery spatial point. Differential geometry is a discipline that uses calculus to study geometry.

3. Evolutionary Law of Eight Major Technical Systems 1 The S-curve Evolutionary Law of Technical Systems Let's first take a look at an example - an example of keyboard evolution: As one of the important components of computer peripherals, keyboards can be seen everywhere. At present, the commonly used keyboard is a rigid whole with a relatively large area, which is inconvenient to carry.

What are the evolution rules of triz's eight technical systems?

The eight major technical system evolution laws mainly include the law of completeness, the law of energy transfer, the law of dynamic evolution, the law of improving ideality, the law of subsystem imbalance evolution, the law of supersystem evolution, the law of micro-level evolution, and the law of coordination.

Completeness, energy transmission, dynamic evolution, improving ideals, etc. The eight major technical systems refer to the eight major high-tech fields supported by the state. The laws of evolution mainly include completeness, energy transmission, dynamic evolution, ideal improvement, subsystem imbalance, hypersystem, micro level and coordination.

The law of technological system evolution. TRIZ theory summarizes and distils eight basic evolutionary laws, including the law of self-improvement of technical systems, the law of improving ideals, the law of unbalanced evolution of subsystems, etc.

The root cause of the evolution of the technological system

1. The TRIZ theory provides scientific methods on how to systematically analyze problems, such as the multi-screen method; and for the analysis of complex problems, it includes scientific problem analysis construction. The model method - object-field analysis method, can help quickly identify core problems and find fundamental contradictions.

2. The evolution of the technological system follows certain objective laws, and also faces superiority and inferiority, which is correct.

3. Mature period. At this stage of system development, a large amount of human and financial investment has made the technical system more and more perfect, the performance level has reached the highest, and the profit obtained has reached the maximum and has a downward trend. In fact, most of the research results produced by the large investment at this time are low-level system optimization and performance improvement.Growth period.

4. Invent the problem-solving algorithm ARIZ. It mainly targets the technical system with complex problem situations, contradictions and their related components. It is a non-computable logical process such as a series of deformation and redefinition of the initial problem, which realizes the gradual in-depth analysis of the problem, the transformation of the problem, and the solution of the problem.

The principle of co-faced evolution of celestial systems

The highest celestial system: total galaxy; the lowest level celestial system: Earth and Moon. Celestial body: Celestial body is the form of existence of matter in the universe.

This layer circle may have a convection phenomenon, so it is called a soft flow circle. This layer circle has mobility, so it can also be a zone of mobility. There may be magma in this circle. This circle is the adjustment zone of Isostasy.

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The solar system is a celestial system composed of the sun, planets and its satellites, asteroids, comets, meteors and interstellar matter. The sun is the center of the solar system. In the huge family of the solar system, the mass of the sun accounts for 98% of the total mass of the solar system, and the proportion of nine planets and tens of thousands of asteroids is very small.

Isotropicity refers to the orbit of the sun in a counterclockwise direction of the eight planets; coplanar, which means that the orbital surfaces of the eight planets orbit around the sun are close to the same plane; near-circularity, which means that the orbits of the eight planets are close to a circle, and the eccentricity is not large.

What do you think of the system evolution tree

1. A node is a new species in terms of the evolutionary relationship of the sequence. Therefore, it can be seen that 1-9 has not appeared in the identified strains, and they are all new species. Analyze from the perspective of evolution. 1, 3, 4, 5, 6, 7, 8 and 9 belong to the same cluster, and the evolutionary relationship is relatively close. 2 is close to the bottom cluster of species.

2. Here, I will introduce how to view the phylogenetic tree. First of all, let's learn the basic structure of the phylogenetic tree. As the name means, the phylogenetic tree has a structure similar to that of a tree: the common ancestor of all branches of the root is called the root.

3. Concisely represent the evolutionary process and affinity of various organisms, which constitutes the evolutionary system tree of organisms.

4. Dear, hello~ Regarding the system purification tree, I used to make a simple phylogenetic tree when I was studying bioinformatics, using cluster X and MEGA software. The constructed developmental tree is also the names of the systemic evolution tree, species tree (speciestree), gene tree, etc. that are the same or slightly different in meaning.

How to analyze the system evolution tree

How to analyze the evolution tree (1) Horizontal direction: the degree of change of genetic variables The branch in the horizontal direction represents the evolutionary spectrum over time, and the longer the length of the branch, the branch The greater the change of species.

The tree can rotate 90 degrees to the right, from top to bottom. EvolveThe tree is composed of nodes and evolutionary branches, and each node represents a taxonomic unit (genus, population, individual, etc.). The evolutionary branch defines the relationship between taxonomic units (ancestors and descendants), and a branch can only connect adjacent nodes.

First, if the same results can be obtained by constructing the tree in different methods, it can prove that the tree is reliable; second, the data can be re-sampled to detect their statistical importance.

Distance-based methods Distance method: (Distance-based method: First, through the comparison between species, the evolutionary distance between taxons is derived according to a certain assumption (evolutionary distance model) and an evolutionary distance matrix is constructed.The construction of the evolutionary tree is based on the evolutionary distance relationship in this matrix.