function | programmerah

function | programmerah

Requirement: when responding to an error, the rendering will display the interface with error information preparation: create error information interfaces 400. Vue and 500. Vue in content note: pay attention to the level of routing where the error interface needs to be placed (Im under children)

When the project uses easyUI, the foreground reports an error, type error: A is undefined. I see that the error location is actually the source code of JQ Its impossible. I searched a lot of information on the Internet, but I didnt solve the problem. After nearly a months thinking, I seem to have found the cause of this problem. It may not be right. It only represents personal profile. If there is a positive solution, please let me know. Thank you.

Note that this code is not put in any function, nor is it wrapped with $(function () {}). Just this sentence is put directly in JS code. This is all the cases that report this error in my project. My preliminary analysis is because JS thinks that there is no method to call this sentence, so it reports an error.

How can we measure the difference between a result and the actual calculation? One idea is that if the result is closer, the difference will be smaller, otherwise, it will be larger. This function provides such an idea. If the calculated value is closer to 1, then it means that it is closer to the world result, otherwise, it is farther away. Therefore, this function can be used as the loss function of logistic regression classifier. If all the results are close to the result value, then The closer it is to 0. If the result is close to 0 after all the samples are calculated, it means that the calculated result is very close to the actual result.

This is a simple composite function, as shown in the figure above. C is a function of a and E is a function of C. if we use the chain derivation rule to derive a and B respectively, then we will find out the derivative of e to C and C to a, multiply it, find out the derivative of e to C and D respectively, find out the derivative of C and D to B respectively, and then add it up, One of the problems is that in the process of solving, e calculates the derivative of C twice. If the equation is particularly complex, then the amount of calculation becomes very large. How can we only calculate the derivative once?

Next, continue to calculate the value of the sub unit, and save the partial derivatives of the sub unit; multiply all the partial derivatives of the path from the last sub unit to the root node, that is, the partial derivatives of the function to this variable. The essence of calculation is from top to bottom. When calculating, save the value and multiply it to the following unit, so that the partial derivatives of each path only need to be calculated once, from top to bottom All the partial derivatives are obtained by calculating them from top to bottom.

In fact, BP (back propagation algorithm) is calculated in this way. If there is a three-layer neural network with input layer, hidden layer and output layer, we can calculate the partial derivative of the weight of the loss function. It is a complex composite function. If we first calculate the partial derivative of the weight of the first layer, and then calculate the partial derivative of the weight of the second layer, we will find that there are some problems A lot of repeated calculation steps, like the example of simple function above, so, in order to avoid this kind of consumption, we use to find the partial derivative from the back to the front, find out the function value of each unit, find out the partial derivative of the corresponding unit, save it, multiply it all the time, and input the layer.

In fact, it is the sum of squares of all the weights. Generally, the one multiplied by the offset term will not be put in. This term is very simple. Ignore it for the time being, and do not write this term for the time being (this is regularization).

So, remember what I said earlier, we will seek the derivative from top to bottom and save the partial derivative of the current multiple subunits. According to the above formula, we know that the partial derivative of the second weight matrix can be obtained by

From the formula on the line, we can see that the derivative we saved can be directly multiplied. If there is a multi-layer network, in fact, the following process is the same as this one, so we get the formula: if there is a multi-layer network, the following process is the same as this one

Because this network is three layers, so we can get all the partial derivatives. If it is multi-layer, the principle is the same. Multiply it continuously. Starting from the second formula, the following forms are the same.

When x approaches negative infinity, y approaches 0; when x approaches positive infinity, y approaches 1; when x = 0, y = 0.5. Of course, when x goes beyond the range of [- 6,6], the value of the function basically does not change, and the value is very close, so it is generally not considered in the application.

Although sigmoid function has good properties, it can be used in classification problems, such as the classifier of logistic regression model. But why choose this function? In addition to the above mathematical easier to deal with, there are its own derivation characteristics. For the classification problem, especially for the binary classification problem, it is assumed that the distribution obeys Bernoulli distribution. The PMF of Bernoulli distribution is: 0

First, the cause of the problem Defines a variable outside a function, and then use the following variables inside a function in python, and change its value, the result error local variable a referenced before the assignment, the code is as follows: error reason: the python functions and global variables with the same, if you have to modify the value of the variable will become a local variable, the reference to the variable nature can appear not to define such a mistake. Second, the solution The problem is solved by declaring a as a global variable with the global keyword:

2. Parameters: first and last First and last are bidirectional iterators, and the scope of reverse function inversion is [first,last], so the elements pointed to by first are included, but the elements pointed to by last are not. 3. Return value The reverse function returns no value. Example 4,

1. Plug-in description: Plug-in 8 requires two parameters. One represents a string that requires spell checking, and the other represents how text should be displayed after spell checking. They are: The $text string variable, which represents the text that requires spell checking. The $Action string variable, which is a letter representing the format in which the text is displayed. dictionary.txt:

Grammatical definitions: Definition: > Mysqli_connect_error () : The function returns an error description of the last connection error. > Mysqli_connect_errno () : The function returns the error code for the last connection error.

Usually caused by an unequal number of elements. For example: when a tuple is assigned to a tuple variable, the result is that there are not enough elements in a tuple. As shown above. Another example: the dictionary items() function returns a traversable array of (keys, values) tuples in a list.

why are refractory bricks suitable for high-temperature furnace lining?

why are refractory bricks suitable for high-temperature furnace lining?

Refractory bricks are made of high-temperature-resistant materials, and various industrial kiln equipment is also used in high-temperature industries. So, can the high-temperature resistance of refractory bricks resist the actual working temperature of industrial kilns? Next, refractory manufacturers will take us to understand why refractory bricks are resistant to high temperatures? And why refractory bricks are used for the lining of high-temperature kilns.

The raw materials used in the production of refractory bricks are generally natural ore. As bauxite, silica, magnesite, and other raw materials are processed into refractory bricks with different properties. Such as aluminum-silicon refractory bricks, silica refractory bricks, and magnesia refractory bricks.

When bauxite is used as the raw material to produce aluminum-silicon refractory bricks, its main components are alumina and hydrated alumina containing impurities. It is an earthy mineral, insoluble in water, but soluble in sulfuric acid and sodium hydroxide solution. It is mainly used for smelting aluminum and making refractory materials. Because the high bauxite clinker has refractoriness as high as 1780, it has strong chemical stability and good physical properties. Purification of bauxite at high temperature produces a main crystal phase of corundum with an alumina content of more than 90%, which can produce ultra-high temperature refractory bricks-fused zirconia corundum bricks.

The raw material for making silica refractory bricks is silica, and the main component is SiO2. The higher the SiO2 content, the higher the refractoriness. The most harmful impurities are AL2O3, K2O, Na2o, etc. The production of silica bricks is based on natural silica as raw material, plus an appropriate amount of mineralizer to promote the conversion of quartz in the green body into tridymite. Slowly fired at 1350~1430 in a reducing atmosphere. Has high-temperature strength. The softening temperature under load is 1620C.

Magnesite is the main raw material for making magnesia refractory bricks, and its basic component is MgO. Magnesium oxide has high fire resistance and insulation properties and can be transformed into crystals after being burned at a high temperature above 1000C. When it rises to 1500-2000, it becomes sintered magnesia, which can then be crushed to a certain size or powder to make magnesia bricks or magnesia ramming materials. Magnesia refractory bricks belong to alkaline refractory bricks, which have strong resistance to alkaline slag but cannot resist the erosion of acid slag. The refractoriness is above 2000C, but its load softening point is only 1500C, and thermal shock stability is poor.

Inorganic non-metallic materials, organic polymer materials, and metallic materials are listed as the three major materials. Ordinary inorganic sub-metallic materials are characterized by high compressive strength, high hardness, high-temperature resistance, and corrosion resistance. In addition, ceramics have excellent properties in corrosion resistance and refractory materials in heat and heat insulation. These are incomparable to metal materials and organic polymer materials. But compared with metal materials, it has low breaking strength and lack of ductility. Compared with organic polymer materials, the density is higher and the manufacturing process is complicated.

The production process of refractory bricks is a process of mineral crushing-raw material mixing-machine forming-high temperature firing, and finally a product resistant to high temperature is produced. The sintering temperature of the green body in the high-temperature tunnel kiln will be higher than the load softening temperature of the product, and the sintering temperature is generally above 1500C. The refractoriness is above 1770. High-temperature resistance is better. Refractory bricks are mainly used to build the lining of steel-making electric furnaces, glass melting furnaces, cement rotary furnaces, and other kilns.

There are many classifications of refractory bricks. According to the high-temperature requirements of different industries, the corresponding refractory bricks can be selected according to the temperature requirements.

Ordinary refractory clay bricks are used for refractory masonry in general furnaces. The service temperature of lining material, furnace wall, furnace bottom, flue, etc. is below 1250. The combustion chamber is allowed to be used above 1400C.

High-alumina bricks are used in areas with high-temperature resistance and wear resistance in general furnaces or masonry with a heavy load, burner bricks, and masonry with special requirements. The dome of the high-temperature zone of the combustion chamber is allowed to be used at a temperature of 1300~1650C.

Lightweight refractory clay bricks are used as furnace linings that are not corroded by high-temperature slag and corrosive gases. Depending on the capacity, the operating temperature is between 1150~1400C. For heat-resistant linings whose working temperature is lower than 1350. It can also be used for masonry without high-temperature melt erosion and erosion, and it can be in direct contact with the flame.

Generally, corundum bricks are suitable for lining the fire surface of heavy oil gasification furnaces with a working pressure below 3MPa, an important part of the lining of salty wastewater incinerators, and radiant burner bricks that work at high temperatures. Generally, the service temperature of corundum brick is below 1600~1670.

Lightweight alumina products (such as lightweight corundum bricks) are used for heat-resistant and heat-insulating linings of high-temperature furnaces, and linings corroded by high-temperature and high-pressure water vapor, generally acting on non-fire surface linings. The service temperature of alumina products is below 1400C.

Silicon carbide refractory bricks have good thermal conductivity, good thermal stability, resistance to reducing atmospheres, and high strength. It is often used as a heat-resistant, wear-resistant lining, and where good thermal stability, thermal conductivity, and anti-reduction atmosphere are required. The service temperature of silicon carbide refractory products is below 1400~1600.

Rongsheng is a refractory brick manufacturer with rich experience in production and sales. Rongshengs refractory products have been sold to more than 60 countries and regions all over the world, for example, Russia, South Africa, Kazakhstan, Philippines, Chile, Malaysia, Uzbekistan, Indonesia, Vietnam, Kuwait, Turkey, Zambia, Peru, Mexico, Qatar, etc. Our main refractory brick products include high-quality silica bricks, high-quality clay bricks, high-alumina bricks with various properties, corundum bricks, magnesia bricks, carbon bricks (carbon blocks), zirconia bricks, etc. If you need to find a manufacturer of high-quality refractory bricks, please contact us. We will not only provide you with high-quality products and services, but we will also establish a guarantee for customers after-sales service. Look forward to working with you.

RS Kiln Refractory Company, a professional Refractory Bricks Manufacturer, has established complete quality system and implements whole staff and whole process quality control. All kinds of Refractory Fire Bricks for sale, strictly according to the ISO9001 standard, are exported to many countries such as Japanese, Indonesia, Iran, Kazakhstan, Vietnam, Korea and etc.

magnesite brick firebricks fire resistant brick real-time quotes, last-sale prices

magnesite brick firebricks fire resistant brick real-time quotes, last-sale prices

Description:The products are fused magnesia as main raw material, after a reasonable size distribution, high pressure forming, high-temperature sintering. The product has strong resistance to slag corrosion ability and high temperature dimensional stability. Mainly used in glass furnace regenerator, the upper part.The bricks with MgO 95% or more in content take the secondary-burning dead burned magnesia or electrofused magnesia as the raw material and bured under the condition of ultra high temperature. They have the features of highly directly bonded and corrosion-resistance and widely used in various kinds of high temperature kilns and furnacesApplication:CrackingfurnaceinpetroleumHotblastfurnaceinmetallurgyPotfurnaceforglassindustryCeramicrollerkiln, tunnelkiln, shuttlekilnforelectricalporcelainInnerliningofkindsofelectricalfurnaceandhightemperatureequipmentAdvantage:1.Competitive Price. Make the products competitive in your market.2.Abundant Experience. Prevent cracks and twist in bricks.3.Different Moulds. Save mould fees for you.4.Lower ferric Oxide,porosity,higher refractoriness,density,higher CCS and exact tolerance.5.Strict Quality Control. Meet clients' quality requirement.6.Safty packing,prompt delivery time,and excellent after-sales services.7.Large stocks. Guarantee prompt delivery.8.Professional Packing. Avoid damage and secure the goods in transportationTypical features:Magnetite bricks, magnetite-alumina bricks and magnetite-zircon bricks etc are the main products of basic refractories. The products have the properties of bearing hightemperature, high refractoriness under load and good resistance to alkali. They are widely used in the basic zone of metallurgical furnaces, nonferrous furnaces and regenerator of glass furnaces.Technical data:FAQs:Q1 Whats the transport method?A1 FCL delivery goods with wooden pallet or wooden case by sea; If LCL delivery, must with wooden case; Sometimes need open top, flat rack or bulk cargo.Q2 Whats the required payment term?A2 Generally 30% TT as the prepayment, 70% TT before delivery. If need, 100% Irrevocable Letter of Credit or negotiation.Q3 Which country are our products exported to?A3 Apart from entire Chinese market, the US, Russia, Japan, Korea, Australia and some Southeast Asian Nations

The products are fused magnesia as main raw material, after a reasonable size distribution, high pressure forming, high-temperature sintering. The product has strong resistance to slag corrosion ability and high temperature dimensional stability. Mainly used in glass furnace regenerator, the upper part.

The bricks with MgO 95% or more in content take the secondary-burning dead burned magnesia or electrofused magnesia as the raw material and bured under the condition of ultra high temperature. They have the features of highly directly bonded and corrosion-resistance and widely used in various kinds of high temperature kilns and furnaces

Magnetite bricks, magnetite-alumina bricks and magnetite-zircon bricks etc are the main products of basic refractories. The products have the properties of bearing hightemperature, high refractoriness under load and good resistance to alkali. They are widely used in the basic zone of metallurgical furnaces, nonferrous furnaces and regenerator of glass furnaces.

high alumina bricks - rs kiln refractory company

high alumina bricks - rs kiln refractory company

High Alumina Bricks, a kind of alumina-silicate refractory products with more than 48% content of Al2O3 inside, aremade of bauxite and other raw material with higher alumina content after molding and calcining. High Alumina Brick hasvarious properties of high temperature strength, high thermal stability and good chemical slag erosion resistance, and ismainly used to build linings of Blast Furnace, Hot Air Furnace, Air Furnace, Reverberatory Furnace and Rotary kiln and etc. Any need or Interest for Our Cheap High Alumina Refractory Brick? Please Contact Us for Lower High Alumina Bricks Price.

High Alumina Bricks are neutral refractory that can be divided into 4 Grades: Grade I means that including 75% contents of Al2O3, Grade II means that including 60~75% contents of Al2O3, Grade II means that including 48~60% contents of Al2O3 and Special Grade High Alumina Bricks include 80% contents of Al2O3.

High Alumina Bricks manufacturing process is similar to much grog clay brick, the different is there are higher proportion of grog in ingredients that can reach 90~95%. Select and screening deironing before the grog crushed. Firing temperature is higher, as of Grade I &II high alumina bricks fired in the tunnel kiln is 1500~1600

According to the different resource situation and production requirement, adopt below several raw materials: high-alumina bauxite, sillimanite mineral and synthetic raw materials. There are abundant resources of high-alumina bauxite with fine quality in China.

RS Company purchases raw materials only from our trusted suppliers that we have cooperated with for long term. All the raw materials shall be checked strictly upon they reached the factory. Each production process will be controlled strictly to ensure quality and consistency so that providing customers with the best quality high alumina bricks.

Buy High Alumina Bricks from RS Company, one of professional high alumina bricks suppliers and has many years experience in the production of refractory materials with strong technical force, advanced production process, good machine equipment, and complete inspection methods. RS Company can provide lower price and quality high alumina refractory bricks for all kinds of furnace lining use.

RS Kiln Refractory Company, as a professional refractory manufacturer in China, produces all kinds of refractory fire bricks, refractory castables and refractory ceramic fiber products, such as high alumina bricks, fireclay bricks, silica bricks, carbon bricks, magnesia bricks, corundum bricks, refractory cement, refractory mortar, refractory concrete, refractory coating, refractory plasitc, ceramic fiber board, blanket, rope, paper, cloth and so on.

introduction of aluminum silicate refractory bricks for high temperature kilns

introduction of aluminum silicate refractory bricks for high temperature kilns

Refractory bricks are the basic materials used in high-temperature kilns and are closely related to the masonry of kilns in various industries. Various industrial kilns have different requirements for refractory bricks, which are the basic materials of their main body, due to their different purposes and conditions of use. Different types of refractory bricks also show different basic characteristics due to differences in chemical mineral composition, microstructure, and production processes. Therefore, if we want to build high-quality industrial kilns, we must master the knowledge of refractory bricks.

Below, the editor from Rongsheng introduces silica-alumina refractory bricks for everyone. In the refractory industry, silicon-aluminum refractory bricks are based on the phase diagram of the AL2O3-SiO2 binary system as the basic theory. It mainly includes the following four types.

Aluminum silicate refractories often contain 5-6 kinds of impurity oxides such as Fe2O3, TiO2, Ca0, Mg0, K2O, and Na20. These impurities exist in the silicon-aluminum binary system and have a great influence on the refractoriness of aluminum silicate refractory materials products.

Aluminum silicate refractories have a wide range of raw materials, simple production process, low cost, low price, and high-temperature adaptability. Furnaces in the industrial sectors of metallurgy, machinery, chemical industry, power, and silicate are widely used aluminum silicate refractory materials as the main furnace building materials. Among them, the most used are the metallurgical industry, blast furnaces, hot blast furnaces, mixing furnaces, heating furnaces, and soaking furnaces in the iron and steel metallurgical industry. And thermal equipment such as rotary kilns, boiling furnaces, blast furnaces, reverberatory furnaces, aluminum melting furnaces, and non-ferrous metal heating furnaces in the non-ferrous metal industry. These thermal kilns all use a large number of clay bricks, high alumina bricks, mullite products, and corundum products as furnace building materials.

For example, the first-grade high alumina bricks for activated carbon high-temperature converters of a certain company are aluminum silicate refractory bricks with an Al2O content of not less than 75%. The production process is similar to clay refractory bricks. According to the different grades of bauxite clinker used, different quality requirements, and the choice of formula binding agent, the appropriate proportion is distributed, and it is formed by using a brick press and then calcined. This high alumina brick is a neutral refractory material. It has good resistance to acid, alkali slag, corrosion of molten metal, oxidation and reduction reactivity, etc. It also has the characteristics of high thermal stability, refractoriness above 1790, and good slag resistance.

Answer: The outside of the aluminum silicate refractory brick is yellow, but the inside is black. This may be because there is a problem with the raw materials used to make the refractory bricks, which may contain too much iron.

RS Fire Bricks Company is a professional refractory material manufacturer, which is renowned for high quality refractory fire bricks domestic and overseas. The primary fire bricks in RS are high alumina bricks, magnesia bricks series, insulating fire bricks, carbon bricks,etc.

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