There are people who believe that they appearance 90% depends on heredity and only 10% is the result of their personal efforts. But recently scientists have come to the conclusion that genetics determines our appearance only 30-50%, and the remaining role belongs to factors such as ecology, harmful and good habits, nutrition, daily routine.

So it turns out that our appearance depends on what we eat, what we breathe, how often we exercise, and how much time we sleep. Good ecology, pure water, healthy food, a favorable social environment - all this together helps our body develop harmoniously. For example, it has been proven that if children are poorly nourished, they grow below their genetically determined height!

There are also cases where twins, separated by their parents and raised in different environments, were very different from each other in adulthood.

Thus, lifestyle often determines whether we look older or younger.

With all this, one cannot ignore the role of genes in shaping appearance. At the origin of life, strong and weak genes interact with each other. The strong, as a rule, prevail over the weak, which determines the appearance of the future little man. The dominant features, most often, are dark hair, eyes, skin. So, if a woman is a blue-eyed blonde, and her husband is a brown-eyed brunette, then most likely their child will be born with dark hair and eyes.

Facial features, skin color, eyes, hair - all this is formed in a person during intrauterine development. Such features of appearance as, for example, rapid male pattern baldness, hair structure, height, etc. can also be inherited.

But with age, the influence of genetics on our appearance noticeably weakens, and aging begins. It is during this period that our appearance reflects the lifestyle that we led before. Lack of sleep, overeating, alcohol and smoking abuse, a sedentary lifestyle - all this is reflected on our face and figure.

This is how it turns out to be attractive long years, you need to think about this from a young age, and not blame nature for your shortcomings!

Textbook for 7th grade

§ 8.3. What determines the type of body trajectory? Theme development

The trajectory of a body depends on which body the movement of this body is considered relative to.

Let, for example, suppose that a ball with a spider sitting on it falls from the shelf of a moving train. Then the trajectory of the ball relative to the car is rectilinear (Fig. 8.4, a), and relative to the Earth it is curvilinear (Fig. 8.4, b). Relative to the spider, the ball is at rest when falling, that is, its trajectory is one point (Fig. 8.4, c).

Rice. 8.4. Trajectory of a falling ball: a - relative to the carriage, (b - relative to the Earth, c - relative to the spider sitting on the ball; d - trajectory of the Moon relative to the Earth

As following example Consider the movement of the Earth and the Moon. Relative to the Earth, the Earth itself is at rest, and the Moon moves along a trajectory close to a circle (Fig. 8.4, d). But relative to the astronaut on the Moon, the Moon is at rest, and the Earth moves in a circle around the Moon.

Whether the trajectory of a body will be closed or not also depends on in relation to which body the movement of this body is considered. We invite you to look at the following example.

The ship makes trip around the world For half a year. Will its trajectory be closed if we consider the movement of the ship: a) relative to the Earth; b) relative to the Sun?

A function of the form y = a*x 2 + b*x + c, where a, b, c are some real numbers, and A different from zero, and x And y- variables, called a quadratic function. Schedule quadratic function y = a*x 2 + b*x + c is a line called in mathematics parabola. The general view of the parabola is shown in the figure below.

Graph of a quadratic function

Let's examine the location of the graph of a quadratic function, depending on the shape and type of the quadratic trinomial. The first criterion influencing general form the graph of a quadratic function is sign at the highest coefficient.

If the highest coefficient in a quadratic trinomial has a plus sign, then the parabola will have branches directed upward. If the highest coefficient in a quadratic trinomial has a minus sign, then the parabola will have branches directed downward.

The next criterion is discriminant value quadratic equation.

The formula for the roots of the quadratic equation is a*x 2 + b*x+ c = 0.

x = (-b ± √D)/(2*a), where D = b 2 - 4 *a*c.

In the formula for the roots of a quadratic equation, the expression D (b 2 - 4*a*c) is called discriminant quadratic equation a*x 2 + b*x + c = 0. This name comes from Latin language, translated means “discriminator.” Depending on the value of the discriminant, the quadratic equation will have two or one root or no roots.

If the discriminant Above zero, then the quadratic equation has two roots: (x = (-b ± √D)/(2*a)). If the discriminant equal to zero, then the quadratic equation has one root: (x = (-b/(2*a)). If the discriminant negative, then the quadratic equation has no roots.

The root of the quadratic equation a*x 2 + b*x + c = 0 is any value of the variable x such that quadratic trinomial a*x 2 + b*x + c becomes zero. If the value of the function goes to zero, it is equivalent to the fact that the graph of the function will intersect the Ox axis at this point.

Therefore, depending on the value of the discriminant, the vertex of the parabola will be located relative to the coordinate axis in one of the following three ways: below the Ox axis, on the Ox axis, above the Ox axis. The following figure shows the basic layout of the graph of a quadratic function, depending on the two criteria listed above.

Our ancestors believed that state of a person's appearance depends on hereditary factors. However, modern scientists have proven that this is not so. Only 40% of our appearance depends on genes, the remaining 60% is formed by ecology, habits and nutrition.

That is, our appearance depends on air, water, and food, as well as on sleep and exercise. These factors contribute to the harmonious development of our body. For example, with poor nutrition in childhood, a person grows below the height inherent in his genes.

If you separate twins and place them in different social environments, over time they will become different from each other. One will look older, the other younger.

In the same way, depending on the lifestyle you follow, you will look younger or older compared to your peers.

And yet, it is impossible not to take into account the importance of genes in building a person’s appearance, although their role in this is small. When life begins, several genes interact. The future appearance of the child depends on this. The dominant genes may be dark color hair, eyes or skin. For example, a blue-eyed blonde and a dark-eyed brunette will have a dark-haired baby with dark eyes.

Racial characteristics can also dominate. So, for a white woman and a dark-skinned man, the child will most likely be born dark-skinned with curly hair.

The facial features, skin color and eyes of the future baby are formed during intrauterine development.

As a person ages, the influence of genes weakens, and our appearance begins to depend only on. Bad dream, junk food and alcohol lead to a deterioration in appearance. Therefore, it is worth paying special attention to them.

I would like to say that the way we look is the result of our work on ourselves, what we have invested in ourselves.

Let's take a closer look at each type of installation. screw piles. Let us immediately note that everywhere has its pros and cons.

Manual method

For most clients this is the most attractive appearance installation, since it is the cheapest of all possible options. But is it worth deluding yourself with the price? Not always! Installing screw piles manually will not work on dense soil. In addition, with natural human effort, the support is deepened to a maximum of 180 cm. At the same time, the diameter of the piles is also limited to 133 mm. Plus everything manual installation takes up the most space - the radius of work is about 3 meters, which can become an inconvenience in cramped conditions.

Installation using a manual hydraulic machine

Or the semi-mechanical method as it is also called. Perhaps, of all the methods, this has the most optimal ratio prices and characteristics. Of course, it will cost a little more than a manual one, however, work can be carried out on denser soil and even containing small stones. In addition, using a machine, you can install piles in the most cramped conditions, for example, on the water or indoors during floor reconstruction.

A manual hydraulic machine produces more force than several people. The consequence of this is a large depth - about 250-300 cm. And constant torque without jerking allows you to maintain vertical axis without unnecessary control and to avoid premature failure of the mounting hole.

The semi-mechanical method can install piles with a diameter of up to 133 mm.

Installation with a hole drill

This type of installation is much inferior to the previous two in terms of price and more. The machine needs more time to move around the area, and it is much more difficult to maintain verticality. But still, only a hole drill will be able to install screw piles in dense soil, where there are small stones, construction debris and other obstacles. Moreover, the hole drill copes well with work on large slopes and in places where it is impossible to create a platform for people.

Using a hole drill, you can mount piles with a diameter of 108 mm to 159 mm, while their length can vary from 3 to 6 meters. Typically, the use of technology is required in the construction of heavy buildings that require greater depth of supports.

UBM

The most expensive type of installation of screw piles, which is unlikely to be required by ordinary people. Rather, such equipment will be required for the construction of foundations for specialized buildings. The cost of one meter of deepening starts from 1,500 rubles, so from a financial point of view, using the machine in civil engineering inappropriate.

Using UBM, you can install piles with a diameter from 159 mm to 325 mm and a length from 6 to 10 meters. In this case, there are no restrictions on the soil (of course, the exception is rocky soil, in which, in principle, screw piles cannot be installed).

N Don’t forget that you can trust the choice of screw piles better for professionals, who will be able to calculate the design depth of the supports. They will also advise you on the choice of installation type, taking into account the conditions of your site and the planned structure. The durability of the building will depend on this.