Experimental Principle of Hopkinson Pressure Bar
The Hopkinson pressure bar experiment used the Hopkinson bar device to test the dynamic mechanical properties of materials. The strain rate range was 10 <2>- 10 <2> s <2>. The principle was as follows: When the impact rod (bullet) in the gun chamber was ejected into the input rod at a certain speed, an incident pulse would be generated in the input rod. The stress wave would reach the test piece through the elastic input rod, and the test piece would produce high-speed distortion under the effect of the stress pulse. When the stress wave passed through the test piece, it produced a reflected pulse at the same time. The reflected pulse entered the elastic input rod, and the projected pulse entered the output rod. The speedometer could obtain the bullet's speed, and the strain gauge attached to the elastic rod could record the strain pulse, which could then be used to calculate the dynamic stress and strain parameters of the material. According to the incident wave, reflected wave, transmitted wave, and one-dimensional stress wave theory measured by the resistance strain gauge attached to the compression bar, the average strain rate, average strain, average stress, and other parameters of the sample could be obtained through specific calculation formulas. Then, the dynamic compression mechanical behavior of the material could be calculated and studied. Harry Potter and the Order of the Phoenix is not enough. Please click to read the novel!
Experimental Principle of Non-wet Paper Towel
The paper towel was not wet because the cup contained air. When the cup entered the water, the air was compressed. When the pressure was equal to the buoyancy of the water, the water could not enter the cup, so the paper towel would not be wet.
Experimental Report on the Principle of Biosensor and Its Use
** I. Principle of Biosensing Analysis Instrument ** The core of the biosensor analyzer was the biosensor, which was composed of two parts: a biorecognition component and a signal transmitter. The bio-recognition element could selectively bind to the target molecules, and the signal translator would convert the binding event of the bio-recognition element into a measurable electrical signal or optical signal. Then, through specific algorithms and data processing technology, it could achieve high-sensitivity and high-specific detection. One of the instruments used a specially-designed biochemical membrane sensor to detect the concentration of the measured substance. The test substance in the sample will undergo an enzymolysis reaction under the catalyst of the solidified specific enzyme to produce hydrogen Peroxide.The content of the test substance is calculated by detecting the content of hydrogen Peroxide.2 The instrument would scale the standard with a known concentration and measure the concentration of the sample with its current value. The unknown concentration was obtained by comparing the current signal with the standard. After each measurement, the system buffer would automatically clean the sensor's pole for the next measurement. ** II. Biosensing analyzer application ** 1. ** Medical diagnosis ** - It could detect the patient's biological molecules, such as protein, DNA, sugar, etc., and help doctors quickly and accurately diagnose diseases such as cancer, diabetes, and cardiovascular diseases. 2. ** Drug research and development ** - It could quickly screen out candidate drugs with potential efficacy, greatly shortening the drug development cycle and reducing costs. 3. ** Food Safety * - It is used to detect pesticide residue, harmful microorganisms, toxins, etc. in food to ensure food safety. 4. ** In terms of environmental monitoring ** - It could monitor the harmful substances in water, soil and air in real time and provide data support for environmental protection. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Experimental Principle of Oxidation-reduction Reaction of Dextrose
Dextrose was a reducing agent. There were different principles in different oxido-reduction reactions: - In the silver mirror reaction, glucose could reduce silver ions to silver, and the aldo group of glucose was oxided into a onate. At the same time, silver ions were reduced to silver. After the reaction, silver particles formed by the reaction of silver ions and glucose gradually gathered and deposited on the inner wall of the container to form a silver mirror. - When the aluminum group in the glucose and the copper trioxides undergo a reduction reaction, the aluminum group is oxided and the copper trioxides are reduced to cuprous dioxide. - Dextrose Oxidase could catalyze the reaction between beta-D-glucose and oxygen in the air with high specialization, so that the glucose was oxided into glutonic acid and hydrogen peroxide. During the reaction, the cofactor flavin-adenine dinosidic acid (FAD) was reduced to FADH <2>. - In the chemical traffic light experiment, the solution in the conical flask was mixed with soda, D-glucose, and indigo carmine. Indigo carmine was a kind of oxido-reduction indicator that could display different colors in different oxido-reduction states. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the design principle of the high-pressure reactor?
Different types of high-pressure reactors had different design principles: - ** Pure electric vehicle high-voltage principle design **: - ** High-voltage main circuit design **: composed of power battery, positive and negative contactors, pre-charging circuit (pre-charging contactors and pre-charging resistance), high-voltage load (motor controller and high-voltage device). The pre-charging circuit was designed for the motor controller and the large capacity circuit inside the high-voltage electrical equipment to ensure the safety of the electricity when the high-voltage circuit was connected. - ** Control circuit design **: refers to the low-voltage control circuit of the high-voltage contactors in the high-voltage main circuit and the control circuit of the low-voltage control devices such as the controller in the high-voltage circuit diagram. The working voltage is 12/24V. - ** High-voltage detection circuit design **: Real-time detection of high-voltage signals such as voltage, current, and insulation resistance in the high-voltage circuit is required. - ** The design principle of the high-pressure reaction kettle for hydrogen extraction **: The document does not provide detailed information, so I cannot give an accurate answer. - ** High-pressure reaction kettle (a type of pressure transmitter that uses an epoxide-based resin to bond a semiconductor strain gauge to a stainless steel membrane) Working principle **: - After the production raw materials were put in, high-pressure steam was first passed through the jacket to heat it to the predetermined reaction temperature, and then the heating was stopped. - The reaction process generated heat, and the heat was dissipated by the mixed gas with the cooling gas as the flat surface. - Control the opening and closing time of the feed valve and discharge valve, and stop feeding when the raw materials in the kettle reach a certain level. - The raw materials and temperature in the kettle were stirred by a stirring machine, and a constant voltage was applied to the electric bridge of the high-pressure reaction kettle to measure the difference in resistance. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Illustration of the experimental principle of reflection and refraction of physical light
The following is an illustration of the experimental principles of light reflection, refraction, and straight line transmission: ##1. The Straight Line Transmission of Light 1. ** Principle ** - Light travels in a straight line in a uniform medium. 2. ** Experimental phenomenon and corresponding principle illustration example ** - [Shadow Formation]: - When light shone on an opaque object, a dark area, or shadow, would be formed behind the object. In principle, since light traveled in a straight line, when it encountered an opaque object, the light could not bypass the object and continue to spread, thus forming an area behind the object that the light could not reach. You can use a point light source (such as a light bulb), an opaque object (such as a small ball), and a screen to demonstrate. When the three were arranged in a straight line, the shadow of the ball would appear on the screen. Its shape and size depended on the distance between the light source, the object, and the screen. - ** Aperture Image **: - Using a board with a small hole between the screen and the object, an inverted image of the object would be formed on the screen. This was because light traveled in a straight line. After the light emitted by the various points on the object passed through the small holes, it formed a corresponding spot on the screen. These spots combined to form an inverted image. For example, if a candle was used as an object and separated by a cardboard with a small hole in the middle, the image of the candle upside down could be seen on the light screen behind it. - ** Solar and Lunar Eclipse **: - A solar eclipse was when the moon was between the sun and the earth. The moon blocked the sun's light. Because light traveled in a straight line, all or part of the sun could not be seen in some areas of the earth, forming a total solar eclipse, partial solar eclipse, or solar eclipse. Three spheres could be used to represent the sun, the moon, and the earth. They could be placed according to the actual relative positions of the three. When the moon was in the middle position, from a specific area on the earth, the eclipse could be simulated. - Lunar eclipses happened when the Earth was between the Sun and the Moon, and the Earth blocked the Sun's rays. Similarly, when light traveled in a straight line and the Moon entered the shadow of the Earth, lunar eclipses would occur, including total lunar eclipses, partial lunar eclipses, and penumbra lunar eclipses. ##2. Reflection of Light 1. ** Principle ** - The phenomenon of light changing its direction of transmission at the interface between two substances and returning to the original substance. 2. ** Experimental phenomenon and corresponding principle illustration example ** - ** Mirror Image **: - When light rays hit the surface of the mirror, according to the law of reflection, the reflected light rays and the incident light rays are in the same plane as the normal line. The reflected light rays and the incident light rays are located on both sides of the normal line, and the reflection angle is equal to the incident angle. It could be demonstrated using a flat mirror, a point light source, and a screen. The light emitted by the point light source shone on the flat mirror, and the reflected light formed an image point on the screen. If the position of the light source was changed, the position of the image point would also change accordingly. The law of reflection could be verified by measuring the angle of incidence and the angle of reflection. - ** Reflection on Water **: - The calm surface of the water was like a flat mirror. When light shone on the surface of the water, part of the light was reflected. For example, if the light emitted by the scenery on the shore was shot into the water, the reflected light would enter the human eye, and the human eye would see the reflection of the scenery in the water. In principle, the light emitted by the various points on the scene shot to the water surface at a certain angle of incidence. After being reflected by the water surface, the reverse extension of the reflected light intersected at a point, forming a reflection. ##3. Refraction of Light 1. ** Principle ** - The phenomenon of light slanted from a transparent and uniform material to another transparent material, changing the direction of transmission. 2. ** Experimental phenomenon and corresponding principle illustration example ** - ** Arrow experiment in the cup **: - Put a card marked with an arrow behind the cup. When there is no water in the cup, the direction of the arrow will not change. After adding water, the direction of the arrow will change. This was due to the refraction of light when it slanted from the air into the water. Theoretically speaking, light travels at different speeds in two different media, air and water. When light rays enter the water at an angle, the direction of transmission will deviate from the normal direction. For example, when light enters water from the air, the light is bent at the interface. The refracted light is in the same plane as the incident light and the normal line. When light enters water from the air, the refraction angle is smaller than the incident angle. - ** Light Dispersion Experiment (Rainbow Phenomenon): - Sunlight was split into seven colors (red, orange, yellow, green, blue, indigo, and purple) when it passed through the prism. This was because different colors of light had different degrees of refraction in the glass. Red light had the smallest degree of refraction, and purple light had the largest degree of refraction. In the experiment, a white parallel light could be shone on one side of the prism, and a colored band of light would be seen on the other side of the prism. The principle was that different colors of light had different refraction index in the glass. According to the law of refraction, when they passed through the prism, their refraction angles were different, so they were separated to form colored bands of light. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the experimental principle of the reaction between iron and iron?
The iron in the iron chloride-ester is 3-valency, which has a certain degree of oxidisation and can react with iron. During the reaction, Fe3 + ions of iron chloride-iron react with the surface of iron to form FeCl3, which can be reduced back to Fe2 + through a reduction reaction. This reaction was actually a reaction of the iron ions. As long as there were free iron ions, they could react with iron. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What is the experimental principle of the reflection and refraction of physical light
1. ** The principle of straight line transmission of light ** - Light travels in a straight line in a uniform medium. For example, shadows were formed because light traveled in a straight line. When it encountered an opaque object, a shadow would be formed in the area behind the object where light could not reach. Aperture imaging was also based on this principle. After the light emitted by each point on the object passed through the aperture in a straight line, it formed an inverted real image on the light screen. A solar eclipse was when the moon was between the sun and the earth, and the moon blocked the sun's light. A lunar eclipse was when the earth was between the sun and the moon, and the earth blocked the sun's light that shot toward the moon. These astronomical phenomena, as well as the phenomenon of people in front blocking the line of sight of people behind them, were all manifestations of light traveling in a straight line. 2. ** Light Reflection Principle ** - When light travels to the interface between two media, part of the light will return to the original medium and continue to travel. This phenomenon is called light reflection. It could be simply understood by Huygens 'principle (although this principle had certain limitations). Huygens' principle pointed out that every point on the spherical wave surface (surface source) was a sub-wave source of a secondary spherical wave. The speed and frequency of the sub-wave were equal to the speed and frequency of the primary wave. The envelope of the sub-wave surface at each time was the total wave surface at that time. The reflected ray, the incident ray, and the normal line are in the same plane; the reflected ray and the incident ray are on both sides of the normal line; and the reflection angle is equal to the incident angle. 3. ** The principle of light refraction ** - When light enters another medium at an angle from one medium, the direction of transmission will deviate. From a microscopic point of view, the wave was refracted due to the change in the medium. For example, in an experiment, a card marked with an arrow was placed behind a cup of water. After adding water, the direction of the arrow changed. This was the phenomenon of light refraction. Different colors of light would bend to different degrees when refracted, and the degree of bending was determined by the length of the light. For example, sunlight would be refracted when passing through rain particles. Red light would bend the most, followed by orange and yellow light, and so on. Purple light would bend the least, thus forming a rainbow. When light enters a light-dense medium from a light-sparse medium, the angle of refraction is greater than the angle of incidence. When the angle of incidence increases to a certain extent, the phenomenon of total reflection will occur, that is, the refracted light will disappear and all will be reflected back into the original medium. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Does carbolic acid react with hydrogen Sulphur? Experimental Principle Analysis
碳酸与硫化氢反应的原理如下： 从电离平衡角度看，碳酸是二元弱酸，分两步电离，硫化氢也是二元弱酸，也分两步电离。它们的电离常数反映了电离程度的大小。 当两者混合时，反应会朝着离子浓度减小的方向进行。从离子反应的先后顺序角度，根据弱电解质的反应规律判断反应是否能够发生。 从化学平衡常数角度分析，反应的平衡常数可以通过相关离子浓度的比值来表示，如对于反应\(H_{2}S + H_{2}CO_{3}\)（假设反应发生）\(\rightleftharpoons HCO_{3}^{-}+HS^{-}+H_{2}O\)，平衡常数\(K = \frac{c(HS^{-}) \times c(HCO_{3}^{-})}{c(H_{2}S) \times c(H_{2}CO_{3})}\)。如果这个平衡常数\(K\)值较大，说明反应正向进行的趋势较大。 在复分解反应条件方面，虽然初看好像不满足传统复分解反应生成沉淀、气体或水的条件，但由于弱电解质的电离平衡移动。例如硫化氢溶于水呈酸性，碳酸根离子水解呈碱性，二者相互作用，促使反应发生。 <a href="/?from=ask_words" style="color:red" target="_blank">点击前往免费阅读更多精彩小说</a>
Will the reaction of acid and base solution change color? What is the experimental principle?
The reaction between acid and base solution may change color, which can be judged by the different colors of the acid, base, and neutral solutions. The principle of the color change of the alkali-base indicator was that the alkali-base indicator was some organic weak acid or organic weak base. In the solution, they could be partially dissociated into the indicator's ions and hydrogen ions (or hydrogen ions). Due to the change in structure, the molecules and ions had different colors, so they would display different colors in different alkali-base solutions. For example, when the sulfuric acid concentration in the solution was reduced, it would turn red when the sulfuric acid concentration increased. When acid and base react, the solution's pH-value will change, which will cause the acid and base indicator to gain a proton and transform from basic to the conjugated acid, or lose a proton and transform from acid to the conjugated base. Due to the change of its structure, the color will change. This color change is a chemical change, because the acid and base indicator is generally an organic weak acid or weak base. They are weakly ionised in water. The added acid or base will be ionised to produce H or Oh, which will cause the combination of the two to move to the equilibrium of ionisation and dehydration. It caused the ratio of ions to substances in the original solution to change and present different colors. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Is it a neutralizing reaction between potassium Permanganate and hydrogen peroxide-based experimental principle diagram?
The reaction between the two was not a neutralizing reaction, but an oxido-reduction reaction. In this reaction, the Mn element in the KManganite (KM04) was reduced as the oxidiser, and the O element in the hydrogen peroxid (H2O2) was oxided as the reducing agent. The reaction equation is 2KMNO4 + 3H2O2 → 2KhOx +2MNO2 + 3O2 + 2H2O (In this reaction, two molecules of potassium Permanganate and three molecules of hydrogen peroxidereact to form two molecules of potassium dioxide, two molecules of manganous dioxide, three molecules of oxygen, and two molecules of water). Since the neutralizing reaction was a reaction in which acid and base exchanged their components to form salt and water, and the two did not meet the definition of neutralizing reaction, they were not neutralizing reactions. The experimental principle diagram of this reaction was not included in the information provided, so it was impossible to answer accurately. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>