The carbonylative coupling reactions of aryl halides are effective way to synthesize carbonyl compounds. There are more valuable to realize the carbonylative coupling by C-H unactivation. In recent years, transition metal-catalyzed carbonylative coupling reactions have attracted  more attention. But more energy will be needed in the cleavage process of C-H and the demands of the structure of substrates and types of catalyst are very harsh. We summarize the advances in transition metal-catalyzed carbonylative coupling by C-H bond activation from the point of the types of catalyst.

The development history and technical overview of HPPO process by direct oxidation of hydrogen peroxide are reviewed at home and abroad, including the technical features and process flow of Basf/Dow chemical, Evonik/Uhde company, Sinopec and Yida chemical. The mechanism of HPPO process,the conditions of side reaction, the choice of reaction solvent and the purification method of PO are analyzed in detail. Some key problems in HPPO production process are put forward.

A boron-containing polysilicate aluminium manganese flocculant was prepared with sodium silicate, aluminium sulfate, manganese sulfate and sodium tetraborate as raw materials, and applied to the treatment of Songhua River. The results showed that under the conditions of n (Al): n (Mn) = 8:2, n (B): n (Si) = 0.15, n (Al): n (Si) = 0.8, constant temperature heating temperature of water bath at 40℃, and pH 2.5, the new boron-containing polysilicate aluminium manganese flocculant had the best flocculation effect on Songhua River, and its color removal rate could reach 96.23% and turbidity removal rate could reach 95.81%.

In this paper, graphene/CdTe quantum dots composites had been successfully synthesized, the spectral properties of the interaction between Brilliant blue and graphene/CdTe quantum dot complexes were investigated based on the strong fluorescence quenching effect of Brilliant Blue on graphene/CdTe quantum dots composites. Results shown that the UV absorption spectra of Brilliant Blue overlapped with the fluorescence emission spectrum of graphene/CdTe quantum dot composites, and increasing of fluorescence emission intensity of Brilliant Blue and the decreasing of the fluorescence emission intensity of graphene/CdTe quantum dot complex, all these indicated that fluorescence resonance energy transfer between Brilliant Blue and graphene/CdTe quantum dot has been taken place. Also there is a good linear relationship between the decreasing of fluorescence intensity of graphene/CdTe quantum dots composites (F₀/F) and the concentrations of Brilliant Blue, the linear range is 18.93?94.65nmol·L^-1, the detection limit is 6.6nmol·L^-1, which could be used to quantitative analysis of Brilliant Blue solution, and could provide a theoretical and experimental basis for new fluorescence sensors.

The control device uses STM32 single chip as the control chip. In the working process, the angle sensor is used to detect the swing angle of the wind pendulum in real time, and it is displayed on TFT LCD screen. The angle detection signal is transmitted to the main control system, and the PID algorithm is used to process the data. The output signal accurately controls the speed of the hollow cup motor and drives the wind pendulum to swing according to the preset angle.

Bubble size is an important reference index for the utilization of ozone. In order to explore the effect of vibration frequency on bubble size, we independently designed and built an experimental device that can change the vibration frequency and measure the bubble size very easily. This paper describes the design and main structure of the experimental device, as well as the experimental steps in the application process and experimental data obtained through experiments and came up with a method to directly measure the bubble size. It is concluded that the larger the vibration frequency, the smaller the size of the bubble (ie, the higher the utilization of ozone in water).

In view of the fact that the current ski resorts can not disinfect the wearable ski equipment in time, a disinfection cabinet that can disinfect and dry the wearable ski equipment at any time is designed. The disinfection cabinet is mainly disinfected by ozone, supplemented by ultraviolet disinfection, so that the ozone is fully contacted with the ski equipment, and finally achieves efficient disinfection. After the disinfection is completed, the clothes are dried, which can basically solve the disinfection of the ski equipment of each ski resort. The product is suitable for use in various ski resorts, which is convenient and quick.

Coal dust is the main cause of coal mine accidents. The classification and measurement of coal dust particles is very important for online detection of coal dust concentration. In recent years, particle image analysis and processing technology has been applied more and more widely, but the underground environment of coal mine is complex, coal dust image in the process of collection and transmission, will inevitably be affected by noise interference, on the subsequent particle detection. Therefore, it is very important to de-noising the image of coal dust particles. Non-local Means (NLM) denoising algorithm has a significant effect on image denoising, but for classical NLM, the use of exponential function as the kernel function will result in the loss of image details. In order to improve this defect, this paper USES cosine weighted gaussian kernel function to improve the traditional non-local mean algorithm, which can better retain the details of the denoised image. Experimental results show that the denoising performance of this algorithm is significantly better than the classical NLM algorithm, and it can better retain the detailed information in the coal dust image.

Vehicle license plate recognition technology is an indispensable component of intelligent transport system and necessary means to ensure vehicle safety. A simple and practical license plate recognition system for intelligent residential area is designed in this paper, which include image acquisition and preprocessing, license plate location, edge detection, character recognition and so on. The system is developed and build on Qt software plate, and the grayscale and binarization，edge detection of the collected image are processed. In the meantime, the region is located by horizontal projection to eliminate the border, and then the license plate character is segmented by disposal projection. Finally, the characters are recognized and output according to the characteristic value. Experimental results show that the system is easy to detect and effective.

With the development and upgrading of the Internet, the issue of network security has been continuously emphasized, and ultimately promoted to the strategic level of the country.China has established leading organizations and departments related to network security issues to effectively prevent and solve the problems caused by network security.Thus, network security is becoming more and more important. This paper studies Web-oriented attack methods and defense countermeasures, in order to improve the awareness of network operators and users.

Blockchain was first used as a basic core technology in digital cryptocurrency, and has gradually come into public view in recent years with the rapid rise of bitcoin.Due to the decentralization of blockchain, tamper-proof and other features have attracted more and more attention.And the current value of blockchain has exceeded bitcoin itself. It can fundamentally change the current business model, production relationship and existing trust mechanism of human society, which will cause another huge disruption to the existing life of human beings.In this paper, the generation process of blockchain is explained in a simple and profound way, and the design and structure of blockchain is analyzed by combining with ethereum network, and related technical applications of blockchain are summarized.Based on the current market situation, this paper makes a brief analysis of the actual application scenarios and future development of blockchain technology.

Micro service and function convergence is an important concept of information service in the new era. Set Jilin Institute of Chemical Technology as an example, combined with the actual situation to build the functional convergence platform based on enterprise WeChat to a certain extent, has realized the information services from "fragmented" to "cluster aggregation" transformation, and the theory of micro service idea preliminary into reality. Besides, to the further promote about the development of wisdom campus information services provide the accumulation of experience.

Aiming at the problem of insufficient feature information extraction during the fusion course of visible light and infrared images, the fusion technique for visible light and infrared images based on non-subsampled shearlet transform (NSST) and deep Boltzmann machine (DBM) is proposed in this paper. It obtains the significant infrared targets after having optimal energy segmentation by making use of the deep Boltzmann machine (DBM), as well as puts the mapping graph combined the infrared targets region with the background region into sparse decomposition and fusion by adopting the non-downsampled shear wave transform (NSST) . The simulation results show that the results based on the proposed method have better visual effect and better objective performance compared with the existing classical methods.

Acrylonitrile butadiene styrene (ABS)/ Poly-methyl-methacrylate (PMMA) composites were investigated using ABS grafted maleic anhydride as compatibilizer. The effects of different ratio of compatibilizer on the impact strengthand tensile strengthcharacteristics of ABS/PMMA were discussed. Results showed that ABS grafted maleic anhydride compatibilized PMMA improved the mechanical properties of the blends, The tensile property of composites could be increased to the maximum of 55.1 MPa, when the content of compatibilizer was 8%; The adjunction of PMMA improved the performance of ABSMechanical Properties; It has been found that the blend produces the excellent combination of the Comprehensive mechanical properties with the ratio of ABS:PMMA=80:20.

(Ba_1-xHo_x)(Ti_1-xHo_x)O₃ceramics (BHTH) were prepared using the cold-pressing ceramic technique. The structure, site occupations, and dielectric properties of BHTH were investigated using X-ray diffraction (XRD), electron paramagnetic resonance (EPR) and dielectric-temperature measuring techniques. The results indicated that Ho³⁺ ions in the BaTiO₃ lattice could form a self-compensation mode with a slight Ba-site-occupation preference. The solubility limit was determined to be x = 0.03 in BHTH. The dielectric behavior of BHTH showed an abnormal phenomenon, i.e. that the Curie temperature (T_C) shifted towards high temperatures from 128 °C at x = 0.01 to 131 °C at x = 0.03. The increase in tetragonality (c/a) of the crystal structure of BHTH is the main reason of the increase in T_C.

The solid-state reaction method was used to prepare (Ba_1-xPr_x)Ti_1-x/4O₃(x = 0.10-0.20) (BPT) ceramics. The solid solubility and site occupations of Pr ions in BPT were investigated using X-ray diffraction (XRD) and electron paramagnetic resonance (EPR) techniques. The results indicate that the solubility limit is x = 0.17, within which BPT ceramics exhibit a single-phase cubic perovskite structure. Pr ions are substituted predominantly for Ba-sites.

CaCu₃Ti₄O₁₂ (CCTO) ceramic possesses high dielectric constant, and study of doping effects on the structure and properties is beneficial for the interpretation and optimization of dielectric properties of CCTO. In this work, we investigated the structure of CaCu₃Ti_3.95Zr_0.05O₁₂(CCTZ) ceramic by X-ray diffraction (XRD) and the properties of dielectric constant, relaxation, impedance, electric modulus at various temperatures with a dielectric analyzer in a broad range of frequency. The XRD results shows that Zr ions with 5% content can absolutely entered the CCTO crystal lattice. The analysis of impedance spectra and electric modulus suggested a close relationship between the electrical properties of grain and grain boundary and dielectric relaxations at low and high temperatures. Zr doping resulted in a large increase of activation energy of grain, while that for grain boundary was almost unchanged.

The study of polarization and relaxation behavior for transition-metal oxides in alternating electric field is meaningful for the interpretation of their transport mechanism, dielectric and ferroelectric properties. The dielectric permittivity, relaxation and impedance properties above room temperature for CaCu₃Ti₄O₁₂ (CCTO) ceramic were studied by dielectric analyzer in a wide range of temperature and frequency. The fitting results of impedance indicate that the activation energy for high temperature is equal to that of electric conduction of grain boundary, which is different from the dielectric relaxation mechanism below room temperature. Our results suggest that the dielectric relaxation at high temperature is originated from the grain boundary effects of polycrystalline ceramic.

A series of treated samples prepared by using the as-prepared Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ and sodium fluoride solution with various concentration. X-ray powder diffraction, scanning electron microscopy, infrared spectrum, Electrochemical impedance, cyclic voltammograms and charge-discharge tests were employed to investigate the structure and electrochemical performance of the treated samples. The results show that the treated optimal sample exhibits the best electrochemical performance among all samples while the molar ratio of Li_1.3Ni_0.14Mn_0.68Co_0.07O₂ to sodium fluoride is 1: 1.5. In the voltage range of 2.5 to 4.6V and 1C rate, the discharge capacity of the untreated and treated optimal sample exhibits the 1st cycle capacity of 71 and 128.6 mAh/g, respectively; and the 30th cycle capacity of 173.9 and 193.3 mAh/g. The charge-transfer resistance and polarization of the optimal sample significantly decreased, and the Ni-O，Co-O and Mn-O bond on the surface of the treated optimal sample enhanced, thereby the electrochemical performance of the sample improved.

In order to solve the problem of environmental pollution of waste polyethylene terephthalate (PET) caused by waste polyester, we used the mixed depolymerization of alcohol and water instead of the traditional hydrolysis method.The effects of temperature, ratio of alcohol to water, reaction time, concentration of alkali and volume of solvent on depolymerization of waste polyester were investigated by orthogonal experiment.Experimental results show that Select polyester quality 2.5 grams of the condition the degradation of mixed alcohol water temperature between 75 ℃ to 78 ℃, 7:1 alcohol water ratio, reaction time in about two hours, the mass fraction of alkali is 16%, solvent volume of 40 ml, as depolymerizing effect is best.

Transition metal borides (TMBs) have long been considered as potential superhard materials. But the TMBs, which has been synthesized, do not exhibit superhard properties. In order to explain the reason why the synthesized TMBs do not exhibit superhard properties and to explore the hardness mechanism of TMBs, In this paper, molybdenum diboride is considered as the material for exploring the hardness mechanism. Through comparing the theoretical calculation and the existing data, we found that the chemical bonds formed between Mo and B atoms possess ionic character in MoB₂ which leads to it can only be a hard material. Our results are helpful to understand the hardness mechanism and design superhard materials in TMBs.

Geomagic Design X software is used to reverse model the laundry bottle, collect data from the bottle, process data to generate STL files, and then rebuild the model, which provides a basis for subsequent die design and processing.