Dangers lurk at every step, except for the gases used by man in many areas of activity. Gas poisoning is detrimental to humans in most cases, antidotes for many species have not yet been invented or found
Science 2024, November
Matrix is a special mathematical element. It is a table consisting of a certain number of rows and columns. Matrices are used in mathematics to write and conveniently solve systems of linear equations. Systems of equations using a matrix are solved using the Gauss method, Cramer's method, the method of algebraic additions, etc. The basis of working with matrices is to bring it to a standard, or triangular form
The article talks about what a TNT equivalent is, when this criterion was first introduced, what they measure, and why such a definition is needed
Aerodynamic drag is a force acting opposite to the relative motion of any object. It can exist between two layers of solid surface. Unlike other resistive sets, such as dry friction, which are almost independent of speed, the drag forces obey a given value
The lifting of multi-ton machines - planes - into the air became possible thanks to the study of aerodynamic laws by man. Of course, wings and an engine alone are not enough for an airplane to fly. About why planes fly, the article will tell
Drag-to-drag is the force of aerodynamic drag that occurs whenever a moving object redirects the flow of air coming towards it. It plays a huge role in engineering, modern automotive construction and aircraft design
What is the theoretical basis? Let's try to understand this term on the basis of project activities at school, as well as the organization of the tourism business in the economy
Most people imagine what a river delta is, but not everyone thinks about the role it plays in the life of all representatives of flora and fauna
The ability to critically analyze is very important for a person. In practice, this skill, when used in a timely manner, saves time and prevents rash acts that can only aggravate the situation, helps to unravel the tangle of causes and effects. However, critical analysis is a rather capacious concept. It is useful not only for detectives, but also applicable, perhaps, to all areas of human life. With its features and principles of work, we will try to figure it out
In the conditions of market competition, it is of particular importance for each company to reduce costs and extract more income due to this. The key direction in this activity is the correct organization of labor processes
The article will tell you what the error is. You will learn what species exist, what classification systems operate, and also what are the reasons for the appearance of this phenomenon
Science-based goal setting, design and subsequent improvement of existing educational structures, effective management of education policy are the fundamental principles of the cognitive and prognostic function
The material offers a brief overview of the Brezhnev era in the history of the Soviet state and the author's assessment of the state development of this time
Each material has a certain set of properties that determine its further characteristics. One of these qualities is the resistance to mechanical stress, which is called ultimate stress. This concept is understood not only as the destruction of the material at the fracture point, but also the appearance of permanent deformation. In other words, it is a counteraction to external forces that lead to a weakening of strength
The long history of mankind has brought people to the high level of development at which we are now. It is generally accepted that man is the only rational being on the planet. However, in science there is no exact definition of the criterion of reason. That is why it is difficult to give any characteristics. Disputes on this topic among scientists are still ongoing. It has been experimentally proven that dolphins, elephants, monkeys and other inhabitants of the planet can be attributed to intelligent beings
Corona discharge is a type of self-discharge that occurs when the gas pressure is very high and the field in which it is located is extremely inhomogeneous
The work of modern enterprises, as well as the life of ordinary citizens, cannot do without electricity. At the same time, it should be understood that electric current, despite all its indispensability, is a very real danger. That is why the question of protection against its effects arose almost simultaneously with the first electrical appliances. One of the main links of this protection are fuses
Semantic barriers prevent successful communication. They arise due to different interpretations of the meaning of the message by the interlocutors. Eliminating semantic barriers allows you to make communication comfortable and productive
The neuron's dendrite is responsible for a person's ability to learn new things. For more than half a century, dendrites were considered only as passive antennas for receiving information for a neuron, but gradually the opinion about them is changing. It is possible that dendrites perform large-scale information processing and influence the formation of long-term memory
Man tells stories and stories tell him. With the help of narrative analysis, researchers understand what kind of story a person tells about himself, what narrative underlies his perception of the world or specific situations
Denotation is the literal meaning of the sign, significat is the meaning of the denotation for a person. The significative content of information depends on the denotation and connotations. For successful communication, understanding the significance of the message is a key condition
Augustus, or August de Morgan lived in the middle of the 19th century in Scotland. He owns many scientific works. Among them are works on the topic of propositional logic and the logic of classes. And also, of course, the formulation of the world-famous de Morgan formula, named after him
Before considering the methods of molecular biology, it is necessary to understand and realize at least in the most general terms what molecular biology itself is and what it studies. And for this you will have to dig even deeper and deal with the euphonious concept of "genetic information". And also remember what a cell, nucleus, proteins and deoxyribonucleic acid are
Everyone knows that light has the ability to refract and reflect. But only the formulas of geometric and wave optics can explain how, or rather on what basis, this happens
In books about sea voyages or adventures, in films about desperate sailors, in articles on a geographical theme and in conversation between sailors, the term "nautical mile" often slips. It's time to figure out what this measure of length in shipping is, and why sailors do not use the kilometers we are used to
Since the 1970s, the start of commercial use of fusion energy has consistently been pushed back by 40 years. However, much has happened in recent years, due to which this period can be reduced
Modeling is a hobby for those who like to tinker with tools at their leisure, are fond of technology and are not indifferent to its history. What is a model? This is a reduced copy of a certain prototype, made in compliance with the scale and other similarity criteria
In analytical chemistry, a special section is considered, devoted to the determination of the mass of substances. Determining the mass of the residue allows you to calculate the percentage of the substance in the mixture
In higher education institutions, the concepts of "induction" and "deduction" are often used, but rarely explained. Therefore, out of habit, many people use them, talking at the exam about the methods of a particular science (depending on the subject being taken). But if such peppy respondents are asked to give examples, many are lost. It is especially difficult for them to tell the difference between induction and deduction. This is a traditional question for many who have drawn ticket number one
You can imagine what mechanical waves are by throwing a stone into the water. The circles that appear on it and are alternating troughs and ridges are an example of mechanical waves. What is their essence?
The article is devoted to office work. Its purpose, stages of implementation, scope of application and modern tools are considered
The Pythagorean theorem, the well-known geometric theorem that in a right triangle the sum of the squares of the legs is equal to the square of the hypotenuse, or in the familiar algebraic notation - a2 + b2=c2, should be known not only by every schoolchild, but also by any self-respecting educated Human. This article describes the definition of the Pythagorean theorem. As well as the history of its creation
Single-celled organisms are considered the most primitive representatives of the animal kingdom. They form an extensive type of protozoa, the variety of which we will consider today. The Latin name for this type is Protozoa. Since single-celled organisms are difficult to separate into animals (Protozoa) and plants (Protophyta), they are often combined into the Protista group
We are always and everywhere surrounded by light, as it is an integral part of life. Fire, the sun, the moon, or a table lamp all fall into this category. Now our task will be to consider natural and artificial light sources
Bleach (or bleach) is a complex mixture, which is a chemically rather active substance and exhibits the properties of a strong oxidizing agent. In aqueous solutions, it hydrolyzes, forming hypochlorous acid (HC1O). Widely used as a disinfectant and bleaching agent
With every discovery in any scientific field, there is a need to somehow identify and explain new phenomena, processes, the relationship between them. The conceptual apparatus of science is a dynamic phenomenon, changing in parallel with the vocabulary of the field of use
Abram Fedorovich Ioffe was a famous physicist who was born on October 29, 1880. He opened a school, several institutes and departments, and wrote many books. That is why he was called the father of Soviet physics. Abram Fedorovich, thanks to his teacher Roentgen, learned a lot and passed on knowledge to his students
Among the many inventions made by great scientists in the past centuries, the discovery of the patterns of development of our universe in the form of a system of numbers is the most interesting and useful. This fact was described in his work by the Italian mathematician Leonardo Fibonacci. A number series is a sequence of digits in which each member value is the sum of the previous two. This system expresses the information embedded in the structure of all living things according to the harmonious development
Currently, ceramic materials are increasingly used in ferrous and non-ferrous metallurgy, glass and refractory industries. They have unique properties that allow you to improve various areas of production. The most promising ceramic material is silicon nitride. This is the material of the future, thanks to which various technological production facilities are being rebuilt
Every person will surely find in the medicine cabinet such a substance as orthoboric acid. Many use it as a cosmetic or medicine. But it is extremely important to understand what is the difference between boric alcohol and acid. It is necessary to better understand this topic in order to avoid he alth problems and use each substance for its intended purpose