Two azo compounds (L1 and L2) were synthesized from aromatic amine and amino benzoic acid by the diazo coupling reaction. The chemical structure of two azo compounds was characterized by IR and NMR. The the acid-alkaline based discoloration and optical properties of the compounds were also studied. The results show that the compounds L1 and L2 have high molar absorptivity and good acid-base discoloration, and can be used as a potential fluorescent probes.

Apocynum venetum is a kind of medicinal plant with rich medicinal value. Its root, stem, leaf and flower can all be used as medicine. The research progress of the main bioactive components in Apocynum venetum and the development of related products were reviewed in this paper, which can provide some reference for the development of Apocynum venetum products.

The research process in catalysts for carbon dioxide reforming of methane to synthesis gas were summarized. The typical catalysts for this reaction were introduced including precious metal catalysts and nickel-based catalysts. Some of the catalytic properties of transition metal carbides were emphasized. The future research directions of catalysts were out looked.

The liver injury, with more etiology and complex mechanism, involves short-term sudden hepatocyte damage. Animal experiment is essential assay which used for researching the pathogenesis of the disease and drug screening on preclinical. The article is reviewed of liver injury based on the model which includes CCl₄, D-galactosamine, acetaminophen, ethanol and Chimeric mice with humanizedliver, which provides a targeted selection methods for animal experiments to research liver injury.

We establish a mathematical model for calculating stirring shaft torsion deformation and bending strength based on the existed calculation methods for the two parameters.. We show the MatLab algorithm is feasible, accurate and high-efficient, since it could solve the torsion deformation and bending strength of the stirring shaft calculation quickly and accurately. Furthermore, the algorithm and the mathematical model is convenient for calculating the bending strength of the stirring shaft and could be a reference for solving other mechanical design problems.

In order to make the piezoelectric pump work well, it is necessary to reasonably select the passive check valve for the pump. The pressure difference between the two sides of the valve body is very small when the piezoelectric vibrators are powered, so the opening pressure of the valve must be very low. In this paper, in the past research on piezoelectric pump, several commonly used passive check valves for piezoelectric pump, such as cantilever valve, plate valve, dual cantilever  valve and bivalvular valve, are introduced. The structure characteristics of various valves and the advantages and disadvantages in the working process are analyzed, which provides reliable data for the further design of the piezoelectric pump in the selection of valve body.

The boiler is prone to high temperature corrosion of heating surface when burning coal with high sodium content, soot deposition in flue and slagging in water wall, which seriously affects the heat transfer effect and thermal efficiency of boiler. In this paper, the influence of time and temperature on the demineralization effect of coal with high sodium content is studied by analyzing the coal quality characteristics of coal with high sodium content and using the method of ion exchange to study the effect of time and temperature on the removal of sodium from coal with high sodium content.

Taking the leakage of steel pipe welding neck flanges with raised face as the research object, the thickness of the fixture calculated from the two formulas of the torque-less film theory and the bending beam deformation theory is compared with the thickness of the fixture used in the actual application and the mechanical properties of the three different thickness fixtures were analyzed by using the finite element software Abaqus. The results show that the thickness of the fixture calculated by using the torque-free thin film theory is far away from the thickness of the actual fixture. The thickness of the fixture calculated by using the bending beam deformation theory is almost the same as the actual fixture thickness, which is more suitable for practical applications. The design thickness of the fixture plays an important role in the precision and service life of the fixture. Therefore, the theoretical calculation formula of the fixture strength needs further improvement and research.

In order to meet the high efficiency and small size of neutron tube ion source power supply, a technical solution of series resonant push-pull double voltage converter is designed. This converter utilizes the parasitic parameters of Metal-Oxide-Semiconductor Field-Effect Transistor(MOSFET) to eliminate the parasitic oscillation of the circuit, and uses the voltage doubler capacitor as the resonant element to realize the zero voltage current switching(ZVCS) of the switch to reduce the loss. The first wave analysis method was used to establish the voltage gain mathematical model to reflect the influence of the resonance quality factor on the voltage gain. A parameter design method suitable for a push-pull LC resonant voltage doubler circuit is given. A 50W prototype was simulated and manufactured using saber software to verify the correctness of the principle and theoretical analysis of the converter.

In this paper, a uniaxial tensile test was performed on a rubber tube by using the existing laboratory stretching machine and a self-designed simple fixture. The stress-strain curve of the rubber tube was analyzed. The coefficients of material in the three commonly used strain energy density functions were obtained by fitting the existing constitutive equation with the experimental data. The results show that the M-R model is suitable for the range of less than or equal to 100% of deformation, which provided experimental evidence and theoretical basis for future studies.

CNC machining technology is widely used in manufacturing and intelligent manufacturing, which makes China's demand for CNC machining center machine tools more and more high. CNC machining center machine tool is a product of high technology. When the control system fails, the processing efficiency will be seriously affected. This article is mainly for the GSK983Ma-H system CNC machining center, the daily maintenance of machine tools and the production of the system failures were explored, so as to provide reference for the corresponding machine operators.

By using the method of logarithm, the power exponential generation function is expanded into a power series, and the Bernoulli number is used to express the sub - average problems of the number and function, and several mean calculation formulas are obtained.

Web Service discovery is a critical technology in service oriented application development. Due to proliferation in the number of available services, it is challenging to obtain the relevant services available for a given task. In this paper, we propose a novel technique to cluster Web service documents into functionally similar service groups using the Cat Swarm Optimization Algorithm. The experimental results present that the proposed method was effective and enhanced the process of service discovery.

In view of the shortage of water resources and the declining land resources, this paper proposes the design of farmland remote monitoring system based on wireless sensor network. The system is based on Wireless Sensor Network (WSN) technology, which monitors physical systems to monitor such systems as humidity, temperature, etc. to improve crop yield. The WSN consists of a number of nodes, making it possible to capture information by using a set of sensors that can communicate with other information within the network itself and process the data to perform specific tasks. Finally, the design experiment verified the farmland remote monitoring system, and the results showed that the overall operation of the system was good.

The biochar was prepared by using peanut shell as raw materials.  The surface pattern and pore structure of peanut shell biochar were characterized and the adsorption property for Pb(II) from water onto peanut shell biochar was studied. The results indicated that the adsorption of Pb(II) on peanut shell biochar reached equilibrium within 120 min, which accorded the second-order kinetic model. The adsorption data can be fitted by Langmuir model and the maximum adsorption capacity is 68.22 mg·g^-1. The thermodynamics results showed that chemical adsorption was predominant in the adsorption process and increasing temperature is beneficial to the adsorption.

The extraction methods of flavonoids from bitter Gourd was studied and the biological activity of the extracted material was analyzed in this paper. Bitter Gourd powder was obtained by freezing. Different reagents and methods were studied to extract flavonoids and the biological activity was analyzed. The results show that the best method is using acetone and 75 % of ethanol solution as extraction agent, liquid extraction combined with ultrasonic shock extraction at 60 °C. The results of qualitative analysis show that the extract contains flavonoids. The results of biological activity analysis showed that the crude extracts of acetone and 75 % of ethanol and the purified products of polyamide had different degree of inhibitory effect on Escherichia coli、Staphylococcus aureus、Pseudomonas aeruginosa, and the sensitivity to the three bacteria was: Escherichia coli<Staphylococcus aureus<Pseudomonas aeruginosa.

A one-step preparation method for indenone derivatives via rhodium-catalyzed decarbonylative cycloadditions of 1H-indene-1,2,3-triones and alkynes has been achieved. [Rh(COD)Cl]₂ with a bisphosphine rac-BINAP ligand was the most efficient catalytic system for this C-C bond activation reaction. The selectivity of indenone can be enhanced by adding copper chloride as an additive. Under the optimized experimental conditions, the indenone compound can be obtained in 87% yield. This reaction is suitable for a broad range of alkynes and a variety of indenone derivatives were obtained in high yields.

We make a systematic  and deep investigation for the parameterization  form of  2-channel  orthogonal  multifilter banks with symmetry  or antisymmetry . we obtain the parameterization of orthogonal multifilter banks with symmetric center γ/2.When γ=2L,to give the parameterization form of orthogonal multifilter banks is to obtain that of its paraunitary polyphase with order L. We can obtain the parameterization of the original orthogonal multifilter banks by the conclusion and inverse transformation.

the basic principle, development status and development prospect of fiber laser are researched in this paper. The applications of fiber lasers in industry, medicine, military and optical communication are discussed in detail.

Ca₂Zn₄Ti₁₅O₃₆：Pr³⁺red long lasting phosphorescent materials were prepared by sol-gel method.The microstructure and optical properties of the solid solution were characterized by X ray diffraction (XRD), Raman spectroscopy (Raman), excitation spectrum and emission spectrum. The results of XRD analysis show that samples calcined at 1050 ℃ for 22 h possessed, the peak value of XRD diffraction peak is the highest and the crystallinity is the best. The grain size of the sample is between 100nm-200nm. Raman results showed that the doping intensity of Pr did not change the peak intensity, indicating that the doping amount of Pr had little effect on the surface properties of the samples. The excitation and emission spectra show that when the sintering temperature is 800℃, the peak value of excitation and emission is the strongest and the excitation peak is 312nm. The emission peak is 614nm.

According to the characteristics of the engineering, the use of large span and high support tic-tac-toe beam construction method, through the engineering practice to form a set of construction methods of the construction speed is fast and safe and reliable, to ensure the smooth construction of the large engineering tic-tac-toe beam, summary form after the project completed the construction technology of this method.