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The reform and development of higher education should actively respond to the top-level design of the country, and the cultivation of foreign language talents needs to be reformed and innovated according to the background of the times. Under the background of new liberal arts, the construction of teaching system should adhere to the national social demand orientation, adhere to the interdisciplinary integration, and carry out collaborative innovation on this basis. Based on the national conditions and school conditions, according to the school orientation and personnel training objectives, taking the supply-side reform of personnel training as an important starting point, this paper makes SWOT analysis on promoting the construction of “foreign language + science and technology” interdisciplinary teaching system under the background of new liberal arts, and puts forward the construction of “foreign language +” interdisciplinary curriculum system, interdisciplinary teaching mode, interdisciplinary management mode and interdisciplinary curriculum ideological and political mode. The aim is to embody the standard of foreign language discipline based on language and culture, promote the cross-integration of engineering and foreign language discipline, and cultivate interdisciplinary high-end talents. It provides a demonstration for the construction of new liberal arts in national science and engineering universities, and provides practical reference and sample reference for the development of foreign language majors.

Properly solving the problem of garbage disposal is not only very important for building a livable city, but also an important part of realizing green and low-carbon circular development. How to break through the NIMBY dilemma to meet the needs of urban development and public service needs of residents' lives is a practical problem faced by government departments and scientific research. Based on the successful case of "building waste treatment facilities aimed at creating new value for the region" proposed by the Ministry of Environment of Japan and Musashino Cleaning Center in Tokyo, this paper focuses on the industrialization of domestic waste treatment in Japan, the management policies of domestic waste treatment, especially the revision direction of relevant policies. Therefore, it is proposed that (1) further improve the system of laws and regulations, and refine and improve the management measures of different types and different treatment methods of domestic garbage;(2) Effectively mobilize the enthusiasm of all parties and strengthen the construction of garbage disposal facilities in county-level areas through multiple channels; (3) Promote the integration of "production, education and research", and empower the technical bottleneck of domestic garbage treatment and the construction of ecological society with technology.

The Imperial Examination System was the main means of selecting officials in ancient China, and was therefore seen as the main means of upward social mobility between classes. The main objective of this study is to examine the extent of social mobility among classes in the Qing dynasty through the imperial examination, based on Bourdieu’s theory, and through indirect research methods such as comparative literature analysis, and to analyse the social and cultural outcomes of the imperial examination system, as well as its impact on the cohesion, values, and traditional norms of these classes and societies. The study concludes that despite the various reforms that the imperial examination system underwent during its existence, it failed to promote social mobility. This was due to the fact that the ruling class used the imperial examination system to consolidate their rule by strictly controlling the selection of talents and opportunities for class mobility. As a result, the imperial examination system led to institutional and social ideological rigidity.

The faculty is the backbone and core of the school, and it is also a “power army” for the sustainable development of the university. The quality of the faculty is directly related to the comprehensive quality of a school. In the new era, the overall plan of deepening teaching evaluation reform should be implemented comprehensively, so it is necessary to grasp the development pulse of faculty construction and actively explore the new faculty, so as to lay the foundation for the national training of high-quality faculty.

Madal performance is the basic characteristics of structures, which will help to further understand the vibration of structures. Besides, fluid (e.g. water) coupled with structure will strongly affact the modal performance of structure. To get clear the modal performance, Modal tests are conducted for two-layered plate both in air and in water, and modal frequency and mode shape are given. With comparative analysis of modal frequencies in these two cases, it’s shown that influence of fluid on structural vibration is obvious, which will results in significantly reduction of modal frequency, and the maximum reduction is the second mode, and it is more than 42%. But it’s also noted that influence of fluid on mode shape is little.

Three-dimensional geological modeling is widely used in the field of geological research. A successful three-dimensional geological model is a three-dimensional anatomy and integration of the study area. Large-scale three-dimensional geological modeling is limited by software performance and technical difficulties. There are disadvantages such as unequal model splicing elements, morphological distortion and attribute incompatibility. Based on the discrete storage method of DepthInsight software, this paper explores the large-area model fusion and splicing technology to deal with various geological conditions, and carries out large-area multi-block model fusion and splicing from the aspects of element type, quantity and attribute. The large-area 3D geological modeling technology scheme of discrete storage and block splicing is realized, which provides a reference for establishing a large-area 3D geological model.

Stiffened plate has widely application in engineering, stiffened double-layered plate is one typical structure. In this work, research object is the stiffened double-layered plate, modal and forced vibration responses are studied through experimental work and numerical simulation with FEM software, and comparative analysis is also conducted. Numerical results show that, experimental results match well with numerical simulation results, the maximum difference for first four modal frequencies are less than 5%, so numerical simulation is verified to be correct. Conclusions here will help to support the further design and application of stiffened double-layered plate in engineering area.

In order to accurately obtain the mining activities of Roliai laterite nickel mine, based on the remote sensing technology and object-oriented image analysis, methods of multi-scale segmentation based on scale optimization and optimal classification threshold selection were used to extract nine mining activity elements from WorldView II images of of 2013 and 2020 respectively. According to the extraction results, the dynamic changes of each element from 2013 to 2020 were analysed from the aspects of area and intensity. Our accuracy evaluation results showed that the overall accuracies of the two extraction results are higher than 90%, and the Kappa coefficients are higher than 0.81. From 2013 to 2020, the mining scale and mining intensity of Roliai laterite nickel mine showed a trend of rapid expansion on the whole, in which the mining area increased the most, reaching 1.02 km2, and the average annual change intensity was intense, and the corresponding dump area also increased by about 0.35 km2. In the past seven years, Roliai laterite nickel mine has developed from the stage of exploration and mining to forming a relatively complete industrial chain of mining, milling and metallurgyy, entering a development stage of rapid expansion.

In recent years, problems such as unclear mine mining data and illegal mining have brought challenges to mine safety production, ecological environment restoration and mineral resources management. From the perspective of mine production and resource management, this study carried out research on the construction of 3D geological model and the development of visual management system based on multisource data fusion, and selected the Shuijiang aluminum mine in Nanchuan District, Chongqing as the research object to establish a set of 3D visual management system for mine. The visual management system can reflect the production status of the mine in real time, and browse, query, section, reserve and statistics of the three-dimensional model of the mine, which has important practical significance for the supervision of the production mine.

Wind load is the control load in the design of power transmission tower. The shape coefficient of that can be obtained by CFD. Small calculation domain can affect the calculation accuracy, and large one can reduce the calculation efficiency. In this paper, the calculation domains with different sizes are designed to optimize the calculation domain size.

Herein, on the basis of a distributed AI cluster, a real-time video analysis system is proposed for edge computing. With ARM cluster server as the hardware platform, a distributed software platform is constructed. The system is characterized by flexible expansion, flexible deployment, data security, and network bandwidth efficiency, which makes it suited to edge computing scenarios. According to the measurement data, the system is effective in increasing the speed of AI calculation by over 20 times in comparison with the embedded single board and achieving the calculation effect that matches GPU. Therefore, it is considered suited to the application in heavy computing power such as real-time AI computing.

Triassic strata are widely developed in the eastern part of Sichuan Basin. The Mingyuexia anticline and Huangnitang anticline located in the eastern Sichuan structural belt develop Triassic Jialingjiang Formation to Xujiahe Formation. The middle Triassic Leikoupo Formation and Badong Formation on both sides of the anticline are synchronous and heterogeneous strata. They are distinguished regionally according to their different sedimentary environments and lithologic characteristics, and the phase transition boundary between Leikoupo Formation and Badong Formation is determined.

Dianchi Lake is one of the key management points of China’s “three rivers and three lakes basins”, and the construction of wetland park plays an important role in purifying Dianchi lake water body and maintaining the health of lake ecosystem. Based on single factor evaluation method and three improved Nemerow pollution index methods, this study evaluates water quality of South Dianchi Wetland Park, Xihua Wetland Park and Laoyu River Wetland Park, with concentrations of total nitrogen (TN), total phosphorous (TP), chemical oxygen demand (COD), zinc (Zn), nickel (Ni), cadmium (Cd), chromium (Cr), lead (Pb) specifically measured and monitored. The results showed that: (1) the pollution levels of COD, TN, TP and Cr in the three wetland parks are relatively high. (2) based on single factor evaluation method and the improved Nemerow pollution index method, the evaluation grade of the water quality of the three wetland parks is inferior to Grade V. On the whole, the water pollution of Laoyu River Wetland Park is the most worrisome, and the water pollution of South Dianchi and Xihua Wetland Park is slightly better. (3) COD and TP are the main types of pollutants entering the lake in the basins where the three wetland parks are located. Therefore, immediate attention should be paid to the management of water quality state of Dianchi Lake, and the treatment of urban, agricultural non-point source and some uncollected point source pollution should be further strengthened.

Puzhehei Lake is located in Wenshan Prefecture, Yunnan Province. Water pollution assessment is of great significance for the pollution control of the lake and the sustainable development of the basin. This study evaluates the water pollution and eutrophication status of three sampling points (upstream, middle and downstream) of Puzhehei Lake based on single factor evaluation method, comprehensive pollution index method and improved comprehensive pollution index method based on entropy weight method, and analyzes the water health risk. The results show that the water quality of the three sampling points is sub-class V using the single factor evaluation method. The water quality evaluation result based on the traditional comprehensive pollution index method shows that the water quality of the three sampling points belongs to heavy pollution. By contrast, the improved comprehensive pollution index method based on entropy weight method shows that the water quality of Leshui Cave belongs to class V, while the water quality of Puzhehei Village and Karst Wetland Park belongs to class V. According to the comprehensive evaluation method, the water quality of the three sampling points before and after correction is ranked from good to bad as follows: Leshui Cave, Karst Wetland Park and Puzhehei Village. The water bodies of Leshui Cave and Puzhehei Village are moderately nutritious, and the water bodies of Karst Wetland Park are oligotrophic. The chemical carcinogens health risk in water at the three sampling points exceeded the standard seriously, and the risk ranking was as follows: Karst Wetland Park > Leshui Cave > Puzhehei Village, in which Cr exceeded the standard seriously. The non carcinogenic health risk are low, and the risk ranking is Puzhehei Village > Leshui Cave > Karst Wetland Park. In the future water quality control, we should focus on the strict control of TN and TP in rivers entering the lake.

In order to get a more safety and economic foundation, finite element method was performed for a piled mat cap and piled strip cap by the software of STAAD. Through the finite element analysis, plate distribution region of bending moment and shear stress were researched; meanwhile, considering the compatibility of deformation of element plate, how to chose the design value of plate stress was researched. The result showed that: single plate value is not representative, average of value of 9 plates (3x3 array) is close to the fact. Strip cap is better than mat cap both from the moment value and shear value of plate element in this project; strip cap was recommended due to its remarkable economic benefit.

Studying on Qinglongshan Forest Park in Wuhan by typical plot method, 15 typical plots in the park were investigated, and the species richness index, diversity index, evenness index, frequency and important value index were calculated. The results showed that there were 139 species of woody plants belonging to 46 families and 97 genera, including 41 species of evergreen trees, 32 species of deciduous trees, 62 species of evergreen shrubs, 25 species of deciduous shrubs, and 4 species of bamboo belonging to 1 family, 3 genera. Species richness index and Simpson diversity index were all expressed as tree layer > shrub layer, evergreen species > deciduous species. Pielou evenness was tree layer > shrub layer. This study can provide some reference for understanding the existing plant status of forest parks, carrying out science popularization, scientific research, protection and improvement of forest landscape quality.

To study the protective effects of flavonoid and polyphenol (FP) from lotus leaf on the damage induced by N2O4 in mice. Constructing an animal damage model through exposing mice to 45μl N2O4 in a 120 L sealed cabinet for 30 minutes. ICR male mice were randomly divided into normal group, physiological saline+N2O4 group,1.25g/kgFP +N2O4 group, 2.50g/kgFP + N2O4 group, 3.75g/kg FP +N2O4 group. 1.25, 2.50, 3.75 g/kg FP were orally administered to mice respectively for 5 days, equal volume physiological saline for normal group and physiological saline+N2O4 group. Then, the three FP groups and the physiological saline+N2O4 group were exposed to N2O4 in the cabinet on 5th day. In an hour after N2O4 exposure, killing the mice by dislocation to measure the SOD, GSH-Px activity and MDA content in lung tissue, checking pathology change in lung tissue slice. Results were shown: the 1.25, 2.50g/kg FP increased SOD (U/mg pro) by 30.3% and 24.4%, GSH-Px (U/mg pro) by 77.4% and 60.9%, respectively. Pathological observation of lung tissue showed that three FP groups had lighter damage than the physiological saline+N2O4 group. So, FP has significant protective effects on damage caused by N2O4 in mice.

Financial technology (Fintech), including a series of advanced technologies such as big data, artificial intelligence and block-chain, has been gradually applied to various industries after years of development and will become the major driver of the future financial industry. As one of the largest financial markets in the world, the traditional foreign exchange service industry is gradually entering the era of fintech, bringing new vitality to the foreign exchange market through advanced technology and improving the efficiency of foreign exchange management. However, while enjoying the opportunities brought by fintech to the foreign exchange field, practitioners in both fintech and the foreign exchange industry should also actively face the challenges and try to build a safe and efficient foreign exchange market environment.

With the rapid development of the offshore oil industry, electric submersible pumps have become more and more important. They are the main pumping equipment in oil well production and have huge advantages in terms of displacement and production costs. Due to the complex structure of the electric submersible pump, the bad working environment will cause failures. The failure of tubing string leakage is a common failure in oilfields; tubing string leakage of the electric submersible pump will reduce oil production. In order to reduce the economic loss of oil well production. This paper uses PCA and Mahalanobis distance to make the tubing Fault diagnosis of leakage. The feasibility of the algorithm is verified through experiments. The result shows that it can diagnose the failure time of pipe string leakage in advance and hence help us to reduce the maintenance cost of offshore oilfields.

In this paper, the main strength of the relationship between water-cement ratio and concrete, and it uses the contrast test of different water cement ratio, finally, it gets the regular change between water cement ratio and concrete strength. The test results show that: cement. when the ratio of large stone: small stone: water: admixture is 340: 618: 1009: 433: 139: 6.8, the water-cement ratio of concrete is within the range of 0.371-0.479. The concrete strength of the sample decreases with the increase of the water-cement ratio. Finally, the relationship between the concrete strength and the water-cement ratio is obtained by fitting.

In the tunnel projects construction process of our country, there are many crossing karst areas situations. Advanced detection of abnormal geological bodies in karst areas is essential to ensure the safety of tunnel construction. This paper takes Guizhou Provonce Expressway Project—Xinjie Tunnel as an example. By studying the overall karst situation of Xinjie Tunnel, the basic principles of Ground Penetrating Radar detection and tunnel detection principles are explained. The detection methods and effects of the Side Walls and Small Targets are explained by real examples. Advanced detection of the abnormal geological bodies that may be encountered in the tunnel construction and trying to avoid the possible geological disasters in the tunnel construction process, are very important to provide guarantee for the safety of tunnel construction.

The business model innovation (BMI) of internet finance enterprises (IFEs), as a revolutionary reconstruction of traditional financial services, would inevitably have significant impact on the formation of the competitive advantage of IFEs. Based on the distinction between exploratory and exploitative BMI, this paper discusses the realization path of the effects of BMI in IFEs on competitive advantage from the perspective of customer equity. We find that customer equity as a key intermediary variables, play a critical role on the relationship between BMI and competitive advantage of IFEs.

At present, some 600kW and 750kW wind turbines put into operation earlier in China have exceeded their 20-year design life. For these turbines, the safety, reliability and economy of these turbines are usually evaluated in a reasonable way, so as to formulate life extension or decommissioning strategies to maximize economic benefits. Referring to the current international standards and guidelines, this paper takes a wind farm in South China as an example to evaluate the remaining life and state of the turbines. The external environment data of the met mast is extrapolated to the turbine site, and the load simulation is carried out based on the wind turbine model. The fatigue load set of the turbines under the design load condition and the site-specific load condition is obtained. The possible fatigue damage in the historical operation period is calculated. Combined with the linear damage accumulation theory of Miner, the fatigue of each turbine in the site is obtained by load analogy. The final P90 life is obtained by analyzing the uncertainty factors introduced in the assessment of residual life and health status.

In the refining process of gasoline, accurate prediction of the octane number loss is conducive to production management to ensure the octane content in gasoline. Therefore, the relevant research has important theoretical significance and application value. Aiming at the characteristics of octane number loss with few samples, high dimensions and non-linear of the octane number loss, this paper uses maximum information coefficient, recursive characteristic elimination and random forest regression algorithm to select the main characteristics, and establishes the octane number loss prediction model based on least squares support vector machine respectively. Compared with the three algorithms of support vector machine, BP neural network and ridge regression, the experimental results show that the two models of ridge regression and least square support vector machine have higher prediction accuracy, but the least square support vector machine has the best effect.

INTRODUCTION: There is a lack of longitudinal studies investigating daily tobacco use and problem drinking in Africa. The aim of this study was to explore the prevalence of daily tobacco use and problem drinking and to determine the factors associated with daily tobacco use and problem drinking among urban dwellers in a longitudinal study in South Africa. METHODS: electronic interview data were collected from 2213 adults (mean age 45.7 years, SD=15.1; range 20-97) at time 1 (baseline assessment) and Time 2 (12 months follow-up assessment) from one urban centre in South Africa. RESULTS: daily tobacco use only, was at time 1 24.0% and at time 2 23.4%, a decrease of 0.5%. Problem drinking only was at time 1 19.6% and at time 2 21.1%, an increase of 1.5%. Concurrent daily tobacco use and problem drinking increased from time 1 9.5% to 10.3% at time 2, an increase of 0.8%. In longitudinal regression analyses, being male and being born in current city were significantly associated with all three substance use indicators (daily tobacco use; problem drinking; and concurrent daily tobacco use and problem drinking). In addition, older age, not currently married, lower education, underweight and higher levels of perceived stress were associated with daily tobacco use and younger age was associated with problem drinking.

The global economy presents a situation of unbalanced development, and the imbalance of current account is the important aspect of global economic imbalance. This paper constructs the comparative advantage index of financial development and efficiency index of financial system that suits China’s national conditions, demonstratively analyzes how the financial development affects current account.

For Al-Zn-Mg-Cu aluminium alloys, 15 types of η precipitates would possess the symmetrically variants distributed on the closed planes of the Al matrix, parallel to the (0001)η, (21̅1̅0)η, or (101̅0)η interfaces of precipitates. The η2 precipitates, possessing the crystallographic orientation of (111̅1̅)al // (0001)η2 and [110]al // [101̅0]η2, would exhibit four equivalent variants, i.e., η2(1) to η2(4), on the (11̅1̅)al habit planes. In the present work, along the zone axis of [110]al // [101̅0]η, the edge-on configurations showing the twin-like atomic arrays would occur as the growth/coalescence of two η2 variants grown on (111̅1̅)al and (11̅1)al planes, respectively. The twin relationship can be revealed in term of the crystallographic relationship at 70.5° with respect to their habit planes. Alternatively, on the (11̅1̅0)al image, it also indicates the nearly-twinning configuration in between the variant-pair of η2.

Desulfurization wastewater has the characteristics of small discharge and high pollution, and must be strictly treated. To obtain the main factors affecting the evaporation characteristics of desulfurization wastewater in boiler flue, a 600MW unit of a coal-fired power plant in China was taken as an example. According to the theory of fluid mechanics and heat transfer, the numerical simulation method was used. The results show that the way the nozzle is installed on the upper wall of the flue inlet can enhance the evaporation effect of the desulfurization wastewater. It is also revealed that the influence of the flue gas flow rate on the droplet evaporation effect is relatively small. The smaller droplet diameter and the higher flue gas inlet temperature will obviously enhance the evaporation effect of the droplets in the flue. However these two factors will increase the operating cost and reduce the boiler thermal efficiency. Therefore, the values of the droplet diameter and the flue gas inlet temperature need to be further determined by technical and economic comparison.

It is necessary but difficult to make a large number of observations on multiple variables reflecting the residents consumption level and collect a large amount of data for analysis to search for the rules. In this paper, a time prediction model for residents consumption level based on ARIMA and principal component analysis is proposed to solve this problem. Principal component analysis is firstly used to effectively reduce the number of indicators reflecting the residents consumption level. Combined with the ARIMA model, the residents consumption level is predicted. The results reflect the trend of residents consumption level towards the need for enjoyment and development materials on the basis of obtaining basic survival data.

This study investigates the use of calcium-based slurry for simultaneous removal NO and SO2 from oxy-fuel combustion flue gas, and recovery of the sulfur and nitrogen species in resulting solutions. The experiments were performed in a bubbling reactor in a transient mode under the pressure of 20 bar. The various influencing factors including the CaO amount, carrier gas (N2/CO2), and absorption time on the simultaneous NO and SO2 removal process, and the solution products were studied comprehensively. The results show that the NO2 removal efficiency can be improved by the presence of CO2, and the gas phase HNO2 produces in this process. The addition of CaO has positive effects not only on the NO2 removal efficiency but also on the formation of stable HNO3. With the presence of CO2, CaCO3 is formed in a solution initially. With the decrease of pH, CaCO3 is gradually converted to CaSO4, and in particular CaCO3 can be fully avoided through decreasing the pH of an absorption solution to 1.14. At the same time, the formation of unstable S(IV) and NO2- can be prevented when the solution pH is lower than 1.37. The nitrogen and sulfur compounds in the absorption solution (at pH 1.14) were further separated by the addition of different amounts of CaO. In particular, 95% of SO42- finally can be recovered in the form of CaSO4.2H2O with nitrogen in solution existing as NO3- by controlling the Ca/S ratio at 4.70. The effectiveness of calcium-based slurry on the removal and recovery of SO2 and NO is confirmed.

With the overall trends of deterioration in resources and ecological environments not being completely reversed, the Chinese government has adopted the strategy of establishing the Ecological Conservation Redline (ECR). The ECR aims to define limits to the encroachment onto protected ecologically vulnerable and sensitive areas, to prohibit development in these areas, and to enforce strict protection to guarantee regional ecological security. Climate data, remote sensing data, and other related data were used to identify an ECR in Heze, thereby providing an example of principle and methodology for ECR delimitation. After assessment, comprehensive treatment, and coordination analysis, a total area of 924.17 km2, accounting for 7.55% of the city’s total area, was identified as an ECR in Heze. This mainly comprised the area around the Yellow River, the old course of the Yellow River, and the Dongyu River.

A self-made fatigue testing machine was used to simulate the damage process of the insulator interface under working conditions and the damage degree is evaluated by the compressive shear test. The improved interface adhesion model reflects the interface debonding process under different fatigue loads by introducing the damage coefficient χ, migration coefficient α and the debonding coefficient μ. The relationship of fatigue loads and interface damage is established by the peeling force, the unit interface separation work and the peeling time. The test demonstrates that the interface damage near the bottom of the insulator is worse than that near the middle part. The result of this analysis will be beneficial in easily finding damaged places of the insulator, and so as to reduce the power breakdown.

This paper according to the characteristics of Qinghai Province System, constructs the evaluation index of informatization and regional economic development level, and the relationship between informatization and regional economic development in Qinghai Province is analyzed and calculated emphatically based on gray correlation method. The results show that the influence of different indicators on the regional economic development of Qinghai Province is different. Finally, the author puts forward some suggestions on the coordinated development of informatization construction and regional economy in Qinghai Province.

In this paper, three-dimensional numerical simulation was taken on a Linear Fresnel solar receiver tube using molten salt as heat transfer fluid (HTF), in which the porous media was filled to enhance the heat transfer efficiency. The simulation was to analyze the influence of the different conditions (filling rate, porosity and thermal conductivity) on heat transfer effect and wall temperature difference. The results revealed that the Nu (Nusselt number) increased firstly and then decreased with the increasing filling rate in both center filling and annular filling types. The optimal thermal performance were obtained when filling rate were 0.8 and 0.2 in center filling and annular filling, respectively. The Nu were about 1.7 and 1.5 times as the clear receiver. The circumferential temperature difference decreased firstly and then increased with filling rate increasing in both center filling and annular filling types. The lowest circumferential temperature differences were achieved at the filling rate 0.8 and 0.4 in center filling and annular filling types, and temperature difference decreased 15.88°C and 22°C compared with clear receiver, respectively. The Nu and PEC both decreased with porosity increasing. However, the thermal conductivity of porous media had little influence to the Nu and circumferential wall temperature.

Under the guidance of modernization theory and sustainable development theory, this paper constructs the evaluation system of agricultural modernization development level in Shanxi Province, evaluates the development level of agricultural modernization in Shanxi Province quantitatively by using entropy method, analyzes the advantages and disadvantages of agricultural modernization development in Shanxi Province, and puts forward some countermeasures and suggestions for improving the level of agricultural modernization in Shanxi Province.

Water temperature plays a crucial role in water ecological environment both in the reservoir and downstream area. Three Gorges Project (TGP) is the largest hydraulic engineering in the world, and changes of water quality attract much more attention, especially in the thermal structure since impoundment. In order to clearly understand water temperature distribution after impoundment in the Three Gorges Reservoir (TGR), we monitored the temperature distribution of the Taipingxi section which was not far from the dam from early April to the end of July. According to the analyzing of the monitoring data of transverse and vertical temperature variation, we could find that the temperature mixed uniformly in transverse direction. Excepting April, there was basically had no temperature difference in vertical direction, even in April, the maximum temperature difference was only 1.39°C within 100 meters (April 22), the average temperature gradient was only 0.014°C/m; Both the temperature of water and atmosphere have similar variation tendency, but the response of the water temperature to atmosphere is delayed, especially the bottom water temperature. The result indicate that the reservoir has mixed thermal structure during impoundment phase, so the release temperature had little change after the impoundment, the work provide a scientific basis for the development of pollution control and ecological protection measure.

Centranthera grandiflora, a kind of traditional Chinese medicinal materials in Yunnan Province, has very high medicinal value. However, constant expansion of the plantation has resulted in worsening root diseases, an obstacle of continuous cropping. From 2018 to 2019, the author investigated the parasitic nematodes in the rhizosphere of Centranthera grandiflora in Pingbian County, Yunnan province, and identified them according to their morphological characteristics. The results showed that there were two kinds of parasitic nematodes harmful to Centranthera grandiflora root in Pingbian County, Yunnan: Tylenchorhynchus capitatus Allen, 1955 and Helicotylenchus dihystera (Cobb, 1893) sher, 1961.

The removal efficiency of nitrogen and phosphorus is challenging in the conventional biological nitrogen and phosphorus removal processes. In this study, the modified pyrite was used as the fillings of se-quencing batch reactor (SBR) in order to improve the efficiencies of nitrogen and phosphorus removal from wastewater. The results showed that SBR with the modified pyrite could significantly improve the removal efficiencies of nitrogen and phosphorus when compared with that in SBR without fillings (control SBR). The average influent ammonia nitrogen (NH4+-N) and total phosphorus (TP) were 6.96±0.17 mg L-1 and 6.94±0.01 mg L-1, respectively. The average NH4+-N and TP removals of modified pyrite constructed SBR were 49.65±19.49% with 3.54±1.31 mg L-1 of average effluent NH4+-N and 76.20±6.55% with 1.84±0.46 mg L-1 of average effluent TP, respectively. While the average NH4+-N and TP removal efficiencies of con-trol SBR were only 34.76±11.28% and 56.28±0.11%. The mechanisms of the SBR with enhanced simulta-neous nitrogen and phosphorus removals might be anaerobic and aerobic oxidations of modified pyrite, and phosphorus retained in the SBR of modified pyrite was mostly in the form of Fe-bound-P.

Under the ecological perspective, the new type of urbanization, green and low-carbon coordinated development is a powerful engine for economic development. Based on the analysis of the existing results of the new urbanization green development and low-carbon development factors, a new index system of influencing factors for the coordinated development of green and low-carbon urbanization was constructed. And then concludes the results of the analysis by using the relevant statistical data of Heilongjiang Province from 2007 to 2017, using the principal component analysis method and using SPSS statistical software. Finally, puts forward some relevant countermeasures and suggestions on scientific and technological innovation, the industrial structure and cultural education, etc.

The dielectric elastomer generator (VHB 4905, 3M) with diaphragm configuration was investigated with the constant-voltage harvesting scheme in order to investigate its energy harvesting ability. The maximum energy density and energy conversion efficiency is measured to be 65 J/kg and 5.7%, respectively. The relatively low efficiency indicates that higher energy conversion efficiency is impeded by the viscosity of the acrylic elastomer, suggesting that higher conversion efficiency with new low-viscosity elastomer should be available.

Comprehensive characteristics of a pneumatic underwater launching system were analyzed and the simulation was carried out by simulink. The components of the pneumatic underwater launching system were introduced, and the theoretical calculation formula for the system was derived. A rated pressure of 3.5MPa and 5MPa was offered in the numerical work. Analyses in different piston height show good behaviors: Proper increase of piston-initial accumulator pressure is beneficial to reduce hydrodynamic noise, choose the appropriate pressure of accumulator. The hydrodynamic noise of the system can be significantly reduced by optimizing the structure of the double-acting cylinder, increasing the height of the piston and improving the structure of the piston.

With the coming of the era of big data, traditional entity recognition technologies have been unable to effectively finish data preprocessing due to large scale of power grid data and complex volume type features. The rising of Hadoop technologies in these years can deal with big data processings better. Therefore, this paper proposes a power big data entity recognition algorithm based on Hadoop. It applies the discretization algorithm to select higher information accuracy discrete points and put forward a discretization evaluation indicator. In the end, we finish entity recognition of the monitoring data of wind turbines on Hadoop platform.Experimental results show that the proposed algorithm performs well in terms of correctness and breakpoint number experiments and it has a good speed-up ratio. The proposed algorithm can apply to power large data entity recognition processing.

SiC is modeled as a new generation of semiconductor materials because of its excellent properties. The 6H-SiC is modeled by Materials Studio. The band and state density of 6H-SiC are analyzed. In addition, 6H-SiC Substrate, the AL element doping, from the microscopic mechanism, analyzed the 6H-SiC semiconductor conductivity.

Developing miniaturizedultraprecision machine tools (MUMTs) is a rational approach to manufacture micro/mesoscale mechanical components. The dynamic characteristics of MUMTs can be different from that of conventional machine tools, because of its miniaturized structure, downsized components and more flexible assembly. Their dynamics behaviorneeds to be studied. In this paper, the dynamic characteristics of a verticalultraprecisionmicro grinding machine tool were analyzed. An analysis model was established based on finite element method(FEM). Modal analysis was then conducted to obtain vibration mode characteristics of the machine tool, and then the harmonic response analysis was applied to machine tool for verifying its mechanical behaviour. This work helps MUMT developers make a better product at the early design stage with lower cost and development time