bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect of Combined Fertilization on Plant Biomass of Waste Land and Comprehensive Benefit Evaluation in Grassland Mining Area
Authors: Shan Dan , He Jingli , Rong Hao , Zhang Tiegang
Published: May 2020

The dump site formed by the large-scale open-pit coal mining waste piles has poor soil environment and difficult vegetation restoration, and is in the grassland area with relatively weak ecological environment. A completely randomized block design was used to conduct separate application of microbial fertilizer and the combined application of microbial fertilizer and organic fertilizer in this study. The results showed that “Sino Green Agri-Biotech” soil conditioner combined with organic fertilizer had a higher plant biomass by comparing different fertilization methods, the plant biomass increased with the increase of microbial fertilizer application. The RSR (Rank Sum Ratio) method was used to analyze the comprehensive benefits of different fertilization methods from the aspects of microbial community diversity, soil enzyme activity, soil fertility, vegetation growth status and economic benefits. Evaluation results showed that application of microbial fertilizer had an important role in increasing soil fertility and accelerating vegetation construction the combined benefit of E-2001 microbial fertilizer application rate of 0.60 ml/m2 and organic fertilizer was the highest, priority can be given to the process of ecological restoration on coal mine dump in grassland. It is preferred to use a combination of E-2001 microbial fertilizer application rate of 0.60 ml/m2 and organic fertilizer in the soil improvement process of vegetation restoration and reconstruction in the grassland mining area.
Discussion on soft soil foundation treatment technology in municipal road and bridge engineering
Authors: Ni Xiuyong
Published: May 2020

Municipal road and bridge engineering is an important part of the transportation road construction in the city. Its construction quality directly affects the transportation quality and driving safety of the whole municipal road traffic. Among them, the foundation engineering of municipal road and bridge engineering is the main construction link. In the current municipal road and bridge construction process, it is often affected by many factors, leading to the reduction of the construction quality of municipal road and bridge engineering, especially the construction treatment of soft soil foundation in the foundation engineering, which is the main factor directly affecting the construction quality of municipal road and bridge. This paper first introduces the definition and relevant characteristics of soft soil foundation in the construction of municipal road and bridge engineering, and expounds the influence of soft soil foundation on municipal road and bridge engineering, and then analyzes the application of soft soil foundation treatment technology combined with the basic treatment ideas of soft soil foundation in the construction of municipal road and bridge.
Application of Comprehensive Rectification Method in Rectification of Buildings
Authors: Yang Xiaoyi
Published: May 2020

This year, there are two ways to rectify buildings: forced landing and jacking up. The method of landing is to increase the settlement of the smaller side of the building, and the method of landing is the digging soil method, the irrigation method, the pile loading method, etc. the jacking method is on the basis of the stable foundation settlement, and the upper structure or foundation is raised on the larger side of the building so that the building will be leveled back, and the jacking method has static pressure pile top. Lifting method, lime pile lifting method, high pressure jet pile jacking method, etc. But in practice, a kind of rectification method cannot meet the purpose of building rectification. It needs two or more rectification methods to achieve the goal. This method of simultaneous application of two or more rectification methods on the same building is called the comprehensive rectification method. In this paper, some common rectifying methods are introduced. At the same time, the application of the comprehensive rectification method in engineering is explained in the background of practical engineerings.
Case-based Reasoning of Damaged Ancient Buildings based on Ontology
Authors: Wang Ru , Chen Wei
Published: May 2020

At present, China has a large number of ancient buildings, and correspondingly, it also faces many problems. Staff of different professions have inconsistent perceptions of ancient buildings, resulting in inability to interact with information. In addition, the ancient architecture case did not carry out efficient reuse of knowledge. Therefore, this article applies ontology to the field of ancient architecture, and proposes the knowledge expression of ancient architecture based on ontology. And SWRL is used to describe the ancient building rules. Secondly, through the application of case-reasoning technology, the reuse of case knowledge of ancient architecture is realized. Ontology-based case representation can provide a unified definition of ancient building knowledge for different participants and lay the foundation for information interaction. Case-based reasoning provides an implementation method for knowledge reuse of ancient building damage cases.
Analysis of Walking Accessibility of Park Green Space in Weidu District of Xuchang City Based on GIS
Authors: Cui Yage , Tan Wenhao , Cheng Linli , Chen Tingting , Lv Liang , Pan Hui
Published: May 2020

Taking the park green space in Weidu District of Xuchang City as the research object, the spatial service area of the park green space under the mode of pedestrian transportation is analyzed by using the grid analysis function of geographic information system (GIS). The results show that under the walking mode in the research area, only less than 1/10 of the residents can walk to the park within 10 minutes, and nearly 1/5 of the residents can enjoy the service function of urban park green space within 20 minutes. Under the walking mode of 30 minutes, the accessibility area of park green space is only 36.63%, which is mainly concentrated in the new urban area. There are many urban parks with large scale. The number of urban parks in the old urban area is small and the accessibility is relatively poor. The research results can provide theoretical basis for optimizing the spatial structure of green space in Weidu District of Xuchang City.
Study on Sustainable Development Highway Traffic
Authors: Hongjun Li
Published: May 2020

The rapid development of road traffic has provided a driving force for socio-economic development. By analyzing the current status of highway transportation development and investment in environmental protection of highway transportation, it is concluded that only by coordinating the relationship between the development of highway transportation and environmental protection can sustainable highway transportation be realized. By analyzing the practice of highway transportation development, this paper concluded that sustainable transportation development can only be achieved by adhering to resource conservation, environmental protection and technological innovation.
Design discussion of Foundation Reinforcement for A School Canteen Building
Authors: Xiuping Ma
Published: May 2020

This paper took a RC frame building as example whose foundation need to be reinforced for translation and storey addition. Three reinforcement design schemes are raised. Scheme I: Integral foundation consolidation. Scheme II: Restructuring the original foundation into rigid foundation with additional longitudinal strip foundation. Scheme III: Adopting anchor isostatic pressing piles as foundation consolidation. Scheme II should be the chosen one after comparison.
Analysis on influence of adjacent buildings on mutual seismic acceleration response
Authors: Yan Lin , Long Hui , Liu Shu-wen , Chen Wen-zhao , Peng Cheng
Published: May 2020

During an earthquake, the seismic response of adjacent buildings will be affected by each other, which is known as structure-soil-structure interaction (SSSI). In order to study the SSSI between neighboring buildings, the slab foundation frame structure on a typical type II site in Nanjing is used as the object. ABAQUS software is used to establish a nonlinear static-dynamic coupling two-dimensional finite element analysis model of a single building and multiple buildings with different spacing. The numerical analysis of the model shows that: Under the action of earthquakes, the increase of surrounding structures will increase its own acceleration response; when the building spacing ratio is 1/2 and 1/4, the existence of adjacent buildings will reduce its own acceleration response. When the spacing ratio is greater than or equal to 1, the impact tends to be unfavorable, and it is the most unfavorable when the spacing ratio is 2. When the spacing ratio is greater than or equal to 4, the impact of adjacent buildings on each other’s peak acceleration response can be ignored.
Study on electro-osmotic consolidation of bentonite reinforced by nano-montmorillonite
Authors: Li Gang , Zhang Rui , Liu Jia , Li Huanhuan , Liu Rui
Published: May 2020

In order to study the effect of nano-montmorillonite on the electro-osmotic consolidation of bentonite, four groups of electro-osmotic consolidation tests were carried out with different content of nano-montmorillonite (0‰, 1‰, 2‰ and 3‰), and the change rules of current, potential, drainage, water content, pH value and shear strength were analyzed. The results showed that the current, potential and drainage rate decreased with the increase of time. After 48 hours, the current of T2 decreased by 91.23%, which has the lowest decrease rate. Meanwhile, T2 has the largest total discharge and lowest water content. With the distance increasing from anode, the pH value increased, while the shear strength decreased. The research results indicated that nano-montmorillonite has a significant effect on the consolidation of bentonite.
Exergy analysis of large temperature difference series air conditioners in subway stations
Authors: jian Kong Xiang , quan Bi Hai , Lei He
Published: May 2020

In view of the large difference in the heat and humidity ratio of each air-conditioning zone in the subway, the unified cooling and dehumidification method is adopted, which changes the traditional connection mode of air-conditioning terminal in parallel. A cooling system of air-conditioning terminal surface cooler in series, i.e. large temperature difference series cooling system, is applied to the subway station. The large temperature difference series cooling system is divided into three subsystems: cooling water system, chilled water system and end refrigeration system. The second law of thermodynamics, namely the law of exergy equilibrium and thermoeconomics, is used to analyze the feasibility and economy of the large temperature difference series system and its subsystems. After comparing energy consumption and economy with the conventional air conditioning system, it was found that the exergy efficiency of the chilled water system using the large temperature difference series cooling system was reduced. However, the exergy efficiency of the end refrigeration system in the subway equipment area has been significantly improved, saving electricity costs, and the investment can be recovered in 3.7 years, and the exergy cost has dropped significantly. The use of a large temperature difference series cooling system in a subway station can achieve the effect of energy saving and cost reduction.
How to Apply and Implement BIM Technology and Knowledge in Engineering Projects
Authors: Ding Fengyi
Published: May 2020

In the current construction projects, in view of the influence of construction site and external factors, problems such as confusion of technology, poor information and inappropriate communication appeared. These problems directly hindered the construction projects. However, BIM’s appearance has greatly improved part of the perplexities. BIM is a new tool and methods in construction business, also civil engineering. Using of BIM technology in construction projects might promote the development of real estate industry.
Exploration of beautiful village renovation against the backdrop of global tourism
Authors: Gao Zhinan , Li Xusheng , Hu Yangtianyi
Published: May 2020

With the rise of global tourism, construction of villages is facing changes in development goals and priorities. Facing the tasks of physical environment improvement and function improvement, a multi-dimensional beautiful village renovation system of functions, architecture, environment, and facilities is constructed. Taking the Qixi group of Jiangkou village, Zhangfang Town, Liuyang City as an example, based on the basic characteristics of natural resource, historical and cultural traditions, etc., it has promoted the overall improvement of village functions from four aspects: overall functional layout, building renovation, road renovation, and landscape. The purpose is to explore an effective way to renovate beautiful villages under the background of global tourism, and provide some practical guidance for the future renovation of beautiful villages.
Study on Shear Properties of the Soil-rock Mixture
Authors: Li B
Published: May 2020

In order to study the shear properties of the soil-rock mixture, a large-scale indoor direct shear test is used to test the shear strength (τ) of SRM under different positive pressures, and calculates the internal friction angle (φ) and cohesive force (c) according to the molar theory. The effects of soil-rock ratio, gradation, maximum particle size, moisture content, and compaction on the shear properties of the soil-rock mixtures are studied. The results show that as the soil-rock ratio decreases, the τ and φ of the SRM increase, while the c increases first and then decreases, and reaches the maximum peak when the soil-rack ratio is 40:60. As the maximum particle size increases, the τ and φ of the SRM increase, while the c decreases. With the increase of the moisture content, the τ, φ and c of the SRM all increase first and then decrease, and reach the maximum peaks when the moisture content is 10.5%, 10%, and 12%, respectively. With the increase of compaction, the τ, φ and c of SRM all increase. The effect of gradation on τ, φ and c is small.
Experimental study on indoor environment quality in a naturally ventilated classroom of a university using natural ventilation and ventilation fan
Authors: Zong Jie , He Wenjun , Wang Lingna , Chai Hongkai , Zhao Yingying , Liu Jiying
Published: May 2020

Strengthening indoor ventilation is an important measure to improve air quality. In transitional season between spring and summer, a university classroom in Jinan city was selected as the research object. Mechanical air supply is adopted to solve the problem of insufficient fresh air or excessive carbon dioxide concentration in the classroom. CO2 concentration and air change rates are compared in natural ventilation and mechanical classrooms. The experiment shows that the indoor CO2 concentration of mechanical ventilation classroom is relatively low. Under natural ventilation, mechanical ventilation and mixed ventilation, the average air change rates were 1.05 h-1, 1.83 h-1 and 2.7 h-1, respectively. According to the statistics analysis of the questionnaire, 72.84% of the students hope to install the mechanical ventilation in the classroom.
Research on Decorative and Integrated Thermal Insulation Board for External Wall
Authors: Zhanhua Zhang , jie lI , Changyu Shi , Chao Zhang , An Wang , Shan Zhang
Published: May 2020

With the acceleration of globalization, industrialization and informatization, the consumption of energy resources is increasing, and the building energy consumption accounts for about 30%, so the building energy conservation has become an important part of energy conservation and emission reduction. At the same time of economic development, we should reduce building energy consumption and do a good job in building energy conservation [1], and put forward the following ways: the improvement of building’s own heat preservation and insulation performance; the improvement of energy utilization system efficiency such as electricity and heating; the development and utilization of new energy; and the proper management of energy utilization equipment system. Among them, the most effective way is to improve the thermal insulation performance of the building itself. The thermal insulation of enclosure and the air tightness of doors and windows are two important parts of thermal insulation. According to the relevant data [2], the heat loss of enclosure structure accounts for 40-50% of the building energy consumption, and the heat loss of wall structure accounts for about 70%. Therefore, the improvement of the thermal insulation requirements of the wall structure plays a huge role in building energy conservation

In this paper, the experimental research on the exterior wall thermal insulation board of decoration and heat preservation integration is carried out. The influence of fly ash content, asbestos fiber content, composite active activator, waterproof agent and other additives on the physical properties of fiber-reinforced fly ash / cement board is discussed. The optimal content of various factors is determined and its mechanism is analyzed. The optimum proportion of fiber reinforced fly ash / cement board was determined by orthogonal test.
Performance Study on the Bonding Mortar for Prefabricated Light Weight AAC Composite Board
Authors: Zhang Ye , Zhang Ji Xiu , Duan Sai Hong , Liu Ji Kang , Miao Yuan Chao
Published: May 2020

In this paper, the tensile bond performance of different bonding mortars for lightweight composite boards of autoclaved aerated concrete which can be prefabricated in factory is studied. The performance requirements of bonding mortar for the composite boards are proposed. The research methods refer to relevant Chinese standards. The results indicate that the tensile bond strength of bonding mortars for the lightweight aerated concrete substrates varies with the curing age increasing. The special bonding mortar for prefabricated composite board of light weight aerated concrete should have the characteristic of early and relatively high strength in a short curing age. And its early tensile bond strength should not be less than 0.35MPa in 3 hours.
Research on the Properties of High-strength Gypsum Based Tile Adhesive in Interior Decoration
Authors: Zhang Ji Xiu , Zhang Ye , Liu Ji Kang , Miao Yuan Chao , Duan Sai Hong
Published: May 2020

In this paper, a new early strength tile adhesive is prepared by using α- high strength gypsum and its properties are discussed. The research methods refer to relevant Chinese standards. The results show that the tensile bond strength of the adhesive can reach 0.6 MPa in one day and 1.5 MPa in 7 days, which is close to 80% of 28-day strength. It is indicating that the adhesive has high bond strength, rapid strength development, and high dimensional stability. It effectively solves the problems that the traditional cement-based tile adhesive is prone to hollowing, falling off, and cracking. Additionally, no interface treatment is required during the using process of this gypsum-based adhesive.
Organic acid, volatiles profile and sensory properties of ginger wines fermented by different yeasts
Authors: Wu Dandan , Jin Yuhong , Zhao Zhengtao
Published: May 2020

In this research, five yeasts were selected to ferment ginger juice to produce ginger wines. The changes of total sugar, reducing sugar, total acid, pH and alcohol content during fermentation were studied. The organic acid composition, aroma components and sensory properties of produced wine were analyzed. The results showed that all samples were fermented at a similar rate and the alcohol content reached 12%, but the total acidity was significantly different. Wine 5# had the lowest concentration of succinic acid and highest concentrations of pyruvate acid and lactic acid. The flavor fingerprint of five kinds of ginger wines was developed by the Gas Chromatograph - Ion Mobility Spectrometer (GC-IMS). Among 82 identified compounds, around 32 volatiles were found to be unique compounds that related to the special yeast species used for the fermentation. PCA analysis results indicated that wine 4# and 5# had the highest similarity in volatile organic composition. However, they exhibited different sensory properties. Wine 5# had the highest preference score while wine 4# had the lowest preference among five wines. In general, Yeast 5# provided the strongest and pleasant aroma, the best taste and sensory quality.
Dynamic changes of key enzymes activity in a bromate and perchlorate-reducing hydrogen-based membrane biofilm reactor
Authors: Chen YuChao , Zhang YiMing , Han YaMei
Published: May 2020

In this study, the microorganisms in different stages of MBfR were cultured, by using kits to detect the dynamic changes of key enzymes activity, and exploring the effects of biofilm microorganisms on key enzymes activity of MBfR. The results indicated that function or role played by microorganism lived on the outer surface of membrane directly caused the removal of NO3--N, BrO3- and ClO4- from water in the MBfR. The key enzymes activity is related to NO3--N and degraded substances. When the concentration of NO3--N is 5mg/L, the activities of denitrification enzyme were obviously inhibited.
Field detection of material defect of dry transformer winding
Authors: Feng Chao , Hu Jiarui , Sun Hongchun , Liu Jun , Yang Siyuan , Wang Jun , Xie Yi , Chen Junjun , Liu Weike
Published: May 2020

To detect the material defect of dry transformer winding, a series of study were carried out concerning about the law of absorption ray intensity of matter, detection methods and procedures and Photographic density variation rule of copper and aluminium. The field detection was also conducted in residential area without preliminary treatment.
Study on chemical constituents of different species of Dendrobium
Authors: Wan Zhenghui , Huang Qingjun
Published: May 2020

The objective of this study is to determine the erianin of 10 species of Dendrobium by high performance liquid chromatography (HPLC). Processing techniques were washed, dried and ground. The research method for determining the content of erianin was adopted from Chinese Pharmacopoeia 2015 Edition. Acetonitrile-0.05% phosphoric acid (37:63) was used as mobile phase. The samples were separated on Sharpsil-TC18 column(4.6*150mm;5μm) at a flow rate of 1.2mL/min and detected at 230nm, and the column temperature was kept at 30℃. The injection volume was 20μL. The number of theoretical plates was not less than 6000 according to the chromatographic peak of erianin. The result of the study showed erianin was detected only in Dendrobium chrysotoxum among the 10 species of Dendrobium. and the content was 0.098%. Conclusion: The content of erianin in Dendrobium chrysotoxum met the specification of no less than 0.03% in the 2015 edition of Chinese Pharmacopoeia.
Rapid Reduction of Ag2O into Ag by Wheat Straw and Production of Organic Acids under Mild Hydrothermal Conditions
Authors: Ma Teng , Jin Fangming , Zhong Heng
Published: May 2020

Wheat straw is a kind of rich agricultural waste. Resource utilization of wheat straw has received widespread attention. Herein, a novel approach of the rapid reduction of Ag2O into Ag by wheat straw with the production of organic acids under mild hydrothermal conditions is reported. After parameter optimization, almost all Ag2O is converted to Ag at a mild reaction temperature of 150 ℃ and a reaction time of 60 min in sodium hydroxide solution. Meanwhile, wheat straw was converted to organic acid such as formic acid, lactic acid, and acetic acid. This offers a cost-effective approach for Ag recovery and resource utilization of biomass.
Real-time correction method of Muskingum model based on Kalman filter
Authors: qian Li , huanfei Yu , linlin Hu , hangjian Ge , hongri Zheng
Published: May 2020

In flood forecasting, general flood forecasting models or empirical forecasts reflect the average optimal value or relationship curve under the previous data. However, in the operation forecast, the forecast plan value often deviates from the actual situation. This paper takes Muskingum model as an example, and uses the Kalman filter algorithm to correct the forecast results. The algorithm structure and principles were described detailed, and the numerical simulation test was set to verify the efficiency of the Kalman filter algorithm. The correct results with corrected method were compared. The results indicated that the efficiency of the updating system using Kalman filter algorithm was improved. Conclusively, the proposed method could be widely applied in real-time flood forecast updating.
Research and design of grid connection and waste heat utilization of marine generating units
Authors: Yi Anning , Guo Hongtao
Published: May 2020

This work is based on the use of waste heat from the temperature difference semiconductor heat exchanger, which can effectively use the waste heat in the exhaust gas, and convert it into electrical energy output through the temperature difference semiconductor material, which can increase engine efficiency and reduce energy consumption; at the same time, it can reduce engine noise and vibration. Extended service life. Due to the strong electromagnetic interference and severe vibration of the generator, there are few remote control devices on the market for the generator. This project uses a 2.4G wireless communication module to control the frequency conversion and speed regulation of the generator. In order to save manpower, start remotely, stop as soon as possible, monitor the operating status of the waste heat temperature difference power generation, reasonably replace the power, start quickly, and reach the electromechanical Integrated product. The realization of intelligent frequency conversion technology can adjust the engine speed according to different electrical appliances, adapt to external loads, realize automatic voltage adjustment, and save fuel consumption. The grid-connected system solves the frequency and phase problems of generators of different models, generations, and manufacturers in parallel, and realizes the re-mixing of old generators, which greatly improves the service life of engines and the best power generation supply, and reduces power generation systems and storage. The configuration cost of the energy unit improves the comprehensive utilization rate of the equipment, has a higher working efficiency, has good economic benefits, and can achieve the purpose of energy saving and emission reduction.
A Review on Topology, Operating and Control Methods of HVDC Transmission System for Offshore Wind Farms
Authors: Li Jinke , Yin Jingyuan , Guan Yonggao , Wang Zhenquan , Niu Tao , Zhen Hongning , Han Zhikun , Guo Xueying
Published: May 2020

High-voltage direct current (HVDC) transmission systems are a promising solution for long distances power transmission offshore wind farms. In order to satisfy the reliability requirements of receiving-end grid and system, the topology, operation and control of HVDC transmission systems for offshore wind farms should be paid more attention. Thus, the aim of this manuscript is to offer a comprehensive summary of existing topology, operation and control methods applied to HVDC transmission system for offshore wind farms. Special attention is provided to the ac grid fault through control methods, droop control methods, power sharing rules and specific requirements of HVDC system planning, model, design and investment. The results are important for understanding the operation of VSC-HVDC in offshore wind farms.
A New Dynamic Voltage Restorer with Multi-level Open-end Winding Topology
Authors: Yin Jingyuan , Li Jinke , Huo Qunhai , Wu Lixin , Han Libo , Zhang Tongshuo
Published: May 2020

In this paper, a variety of main circuit structures of DVR based on open-end winding are presented. Two inverters are connected in series to realize the multi-level structure and simplify the hardware cost. According to the mathematical model of open-end DVR, a three loop control strategy based on load voltage feedback is implemented to suppress the resonance of LCL filter. Aiming at the common mode voltage problem of open-end winding DVR, a common mode voltage suppression strategy based SVPWM is proposed to completely suppress the common mode voltage of high frequency and low frequency of the system. Finally, an open-end DVR experimental platform is built to verify the effectiveness of the control strategy and modulation strategy.
Long-term Relationship between Electricity Consumption and Economic Growth
Authors: Liyu Xia , Wan He
Published: May 2020

Electricity is an indispensable material basis for economic development. It is necessary to study the relationship between different electricity consumption and economic growth. Based on the quarterly data of China’s electricity consumption and economic development from 2011 to 2018, the long-term equilibrium relationship between variables are analyzed from a causal perspective, and electricity consumption indicators for reflecting economic development are identified. The results show that there is a long-term equilibrium relationship between secondary industry electricity consumption, industrial electricity consumption and GDP. The demand for electricity consumption still needs to be met urgently.
Research on Key Factors Affecting Power Supply and Demand Trend Based on Complex Correlation
Authors: Liu Dunnan , Ge Rui , Li Pengfei , Li Hua , Shi Shanzhe , Li Shilin , Han Jinshan
Published: May 2020

The market behaviors of the supply and demand sides in the power market are the issues that market participants, operators and regulators are most concerned about. This article starts from the two dimensions of power generation market behavior and demand market behaviour, analyzes the impact of power transaction behavior on supply and demand trend changes, and then studies the function of big data technology in correlation analysis. The qualitative data is converted into quantitative data, and then gray rule analysis and correlation coefficient analysis are used to mine association rules. The results show that demand response is the key factor that affects the change of load trend.
Analysis of waste heat utilization of ship main engine
Authors: Zhemin Jin , Yuxin Yang
Published: May 2020

In order to protect the environment, save energy and reduce emissions, and promote the utilization of wave energy, this paper reviews the development history of application generation technology, summarizes its development from two aspects of optimization and application of wave energy conversion devices, analyses the application examples of wave energy generation devices on ships. This paper summarizes the application trend of wave power generation devices on ships: wave power generation should be used as auxiliary and domestic electricity for ships and wave energy should be combined with other new energy sources. Wave energy application in marine power generation can effectively reduce emissions from ships, which is conducive to the sustainable development of human society. The system mainly included low speed marine main diesel engine, waste heat boiler, electricity generation sub-system of power turbine, electricity generation sub-system of steam turbine, the heat exchange equipment, electricity generation sub-system of organic working medium steam turbine and other equipments. Based on experimental data of main engine and later theoretical calculation, this paper studied the effect rules of electricity generation power, waste heat utilization potential and related parameters of the waste heat utilization system under different main diesel load and ambient temperature.
Research on Risk Control under the Background of Electricity Futures Market
Authors: Chang Suyuan , Liu Dunnan , Li Xiaoyu
Published: May 2020

In the process of electricity marketization, the electricity futures market is an effective means to avoid the risk of electricity price fluctuations. Based on the background of the electricity futures market, this article first analyzes the physical and market factors of the price fluctuation risk in the electricity market; then, it studies the principle and implementation effects of the power futures hedging function; finally, the manufacturer’s strategy of hedging based on the price difference between the spot price of electricity and the price of forward contracts has been studied in detail. This article believes that the electricity futures market can effectively hedge the spot market risk, and hedging strategies based on the difference between the spot price and the forward price are better.
The design of a new type of pipe rack for civil construction
Authors: Qingbo Wu , Yinan Xiao , Qiuling Chen
Published: May 2020

At present, the traditional way of placing building pipe fittings has many problems, such as labor, large space occupation, and insecurity, while the shelves on the market are not easy to remove the high pipe fittings and have low efficiency. In this paper, a new type of pipe laying frame is proposed, which consists of adjusting mechanism, taking mechanism and resetting mechanism. It not only optimizes the defects of the common display rack in the market, but also innovates the fixation and arrangement of the internal pipe fittings. It can not only solve the problems existing in the existing building pipe fitting display rack technology, but also reduce the problems and disadvantages in the use process. Under the actual application, it can improve the placement efficiency of the pipe fittings and reduce the staff, so as to improve the practicability of the rack.
Parameters Setting and Debugging of LRDS Control Valve of Variable Pump
Authors: Liming Liu
Published: May 2020

LRDS control valve was taken as the research object which was commonly used in coal walking machinery hydraulic system. Based on different control principles, this paper researched on their work condition and application, combined with practical engineering and maintenance experience, explored the method of parameters setting, precautions and debugging process on experiment table and machinery. The consequence provides principle for our company to specify the inspection process and maintenance regulation, and also provide methods for hydraulic system debugging and fault diagnosis.
Evaluation of Regional Power Grid Investment Capacity Based on Transmission and Distribution Price Reform
Authors: Pan Dong , Wang Yongli , Wang Shuo , Wang Jingyan
Published: May 2020

The transmission and distribution price reform has changed the profit model of the power grid, and a reasonable assessment of the investment capacity of the regional power grid is critical to the future investment planning of the power grid. To this end, first of all, sort out the key index system of power grid investment capacity for transmission and distribution price reform. Then comprehensively consider the available distribution profit, depreciation and external financing of the power grid, and establish a quantitative model of power grid investment capacity; Finally, the ability to invest in the establishment of quantitative models to measure the ability of a power grid investment companies, investment capacity is calculated after the reform of the electricity transmission and distribution, in order to verify the ability to quantify the investment rationality and effectiveness of the model. Finally, taking three power companies as examples, the feasibility of the model and the rationality of investment capacity evaluation are verified.
Modeling and Analysis of a Ship’s Diesel Engine Thermal System
Authors: Zuotian Chen , Jia Lu , Qingfeng Dong , cun Hu
Published: May 2020

This article takes the diesel thermal system as the research object, which simplifies the diesel engine system into four subsystems. This article conducts a thermodynamic analysis of the specific equipment of the host thermal system. Simulink tools in MATLAB are used to build simulation models of specific equipment in the thermal system, and a modular model is used to build a subsystem model based on the specific equipment model. Then, the thermal coupling relationship between the subsystems is used to form the thermal system. The overall model obtains the temperature values of the key nodes of the thermal system network, so that it can predict the temperature changes of the thermal pipeline system nodes of the diesel engine under various operating conditions.
Research on the Mode of China’s Power Spot Market
Authors: Fan Menghua , Yang Su , Zhao Zheng
Published: May 2020

At present, the construction of China’s power spot market is advancing steadily. This paper studies the characteristics and functions of the spot market, analyses the market environment and requirements, studies the key elements and designs the market mode for the spot market under the new situation, and puts forward suggestions for some key problems in the actual operation. This paper can provide reference for promoting the top-level design and operation of China’s power spot market.
Electrical and Mechanical Properties of Carbon Nanotube/Graphite Oxide Cement-based Composite under the Early Age
Authors: Lei Hua , yuan Zeng
Published: May 2020

In this study, Carbon Nanotube (CNTs) cement-based composites were investigated by adding Graphite Oxide (GO) together under the early age. The content and the ratio of GO and CNTs would significantly affect the electrical conductivity and mechanical properties of GO/CNTs cement-based composites. It was observed that the GO/CNTs composites with lower content GO (0.01 wt.%) and CNTs (0.05wt.%) could reach the percolation theory. Meanwhile, the mechanical properties (flexural, compressive strength) of GO/CNTs composites could be increased remarkably. It was also described that linear dependence between electrical conductivity and the stress of GO/CNTs cement-based composites could be found.
Evaluation of Waterflood Development Effect by Using Recovery Degree of Recoverable Reserves and Cumulative Water Storage Rate
Authors: Huang Lijun
Published: May 2020

For water flooded oilfields, the development effect can be given by analyzing the relationship between the recoverable reserves recovery degree and the cumulative water storage rate and water content. Application of recoverable reserves as the basis for evaluating development effects is more comparable than the extent of geological reserves; The cumulative water storage rate is suitable for evaluating the evaluation unit as a whole since its development. Correctly deriving the relationship between the extent of recoverable reserves recovery and the cumulative water storage and water content are the basic conditions for its application.
Experimental and numerical analysis for thermal-hydraulic characteristics in circular tubes with twisted tape and wire coil inserts
Authors: Wang Shuai , Wang Kai , Lu Kun , Zhang Qingguo
Published: May 2020

Thermal-hydraulic characteristics in circular tubes with twisted tape (Y=4.762, 7.143 and 9.524) and wire coil (p=20mm, e=2mm) inserts were studied experimentally and numerically. It was found from experimental analysis that Nusselt number and friction factor in tubes with twisted tape inserts were 38%-57% and 148%-202%, respectively, higher than those of plain tubes .When wire coil was inserted in plain tubes, the Nusselt number and friction factor grew by 75%-94% and 685%-792%, respectively. In particular, Nusselt number and friction factor in tubes with twisted tape and wire coil inserts were 113%-139% and 836%-874%, respectively, greater than those of plain tubes. Furthermore,PECvalue of tubes with the twisted tape and wire coil inserts was larger than all others. Numerical analysis shows that a large tangential velocity can be generated after inserting a twisted band or coil in the tube. The angle between the temperature gradient vector and velocity vector was significantly less than 90°. So collaborative degree between temperature field and velocity field was improved.
Research on the Status Quo of In-use vehicle Environmental Protection Regular Inspection in Tangshan
Authors: Zhang Xiaowen , Wang Jiguang , Bai Zhenyu
Published: May 2020

The project team collected more than 1 million in-use vehicles environmental protection regular inspection data for analysis, the data of annual inspection in Tangshan area are sorted out and analyzed, the conclusion is as follows: 1. The weighted average qualification rate of each inspection method for in-use vehicles in Tangshan was 87.9%. 2. The weighted average qualification rate of different emission stages of VMAS is 88.7%, the weighted average qualification rate of different emission stages of TSIC is 93.9%, the weighted average qualification rate of FRAC in different emission stages is 98.3%, and the weighted average qualification rate of LUGDOWN in different emission stages is 77.8%. 3. After the implementation of the new standard, the qualified rate of TSIC and LUGDOWN in Tangshan will be greatly reduced, but it has little influence on the qualified rate of VAMS and FA.
Evaluation of potential contribution of plant growth-promoting bacteria to land desertification
Authors: He Min
Published: May 2020

The problem of soil degradation is becoming more and more serious, how to effectively repair desertified degraded soil has aroused widespread concern. As one of the emerging strategies, plant restoration has great advantages such as high efficiency and low cost, but this technology also has some defects, that is, it is difficult for plants to be established in the coercive environment of ecological destruction. Modified plant growth-promoting bacteria (PGPB) is usually used to increase crop yield. In addition to their proven uses in agriculture, they also have potential in solving environmental problems. This paper analyzes the limitations of solving the problem of environmental degradation based on phytoremediation, and enumerates and explains two methods for screening PGPB. By enumerating the application status of PGPB in promoting the growth of native plants to prevent soil erosion in degraded areas, the importance of plant growth-promoting bacteria to soil quality and microbial structure before plant remediation was discussed. The purpose of this paper is to provide thoughts and suggestions for the study of phytoremediation by combined plant growth-promoting bacteria and plants in desertified degraded soil environment.
Le complexe terminase, une cible de choix dans le traitement de l’infection à cytomégalovirus humain
Authors: Ligat Gaëtan , Muller Clotilde , Alain Sophie , Hantz Sébastien
Published: May 2020

Le cytomégalovirus humain (CMVH) est un pathogène opportuniste majeur en cas d’immunodépression et représente la principale cause d’infection congénitale d’origine virale. Bien qu’efficace, l’utilisation des molécules conventionnelles est limitée par leur toxicité et par l’émergence de résistance du virus, rendant nécessaire le développement de nouveaux traitements. Lors de la réplication du CMVH, l’encapsidation de l’ADN est réalisée par le complexe terminase qui clive l’ADN pour empaqueter le génome dans la capside. L’absence d’homologues dans les cellules des mammifères rend les protéines du complexe terminase des cibles idéales pour des antiviraux spécifiques. Une nouvelle molécule, le letermovir, cible une étape exclusivement virale en interagissant avec le complexe terminase. Son efficacité a été prouvée lors d’essais cliniques de phase III. Néanmoins, son mécanisme d’action n’est, à ce jour, pas élucidé et aucune activité n’est observée contre les autres herpèsvirus.
Transparency and stakeholder engagement in nuclear or radiological emergency management
Authors: Perko T. , Martell M. , Turcanu C.
Published: May 2020

Stakeholder involvement and transparency are strongly interrelated. Stakeholder involvement is key to strengthening transparency, while transparency is necessary for effective stakeholder involvement. International and European legal requirements in environmental decision-making, radiation protection, nuclear safety and emergency preparedness and response call for increasing levels of transparency and stakeholder engagement. However, recent nuclear or radiological events demonstrate that transparency and engagement in practice are perceived differently by authorities, media and the public. Research conducted in this study by means of a questionnaire sent to authorities responsible for nuclear/radiological emergency management shows a range of challenges related to transparency during a nuclear or radiological emergency, e.g. fear of panic or timely and proper information. Few countries use the full potential of tools and methods for stakeholder engagement in emergency preparedness, although these may also contribute to improved transparency. Despite lessons learned to enhance transparency and stakeholder engagement in nuclear or radiological emergency management, there is room for improvement at a practical level and for finding a common understanding among stakeholders.
Neoadjuvante Daylight Photodynamische Therapie bei Spinozellulärem Karzinom an der Kopfhaut zum Debulking des Nachexzisionsareals
Authors: Steinert S. , Steinert M. , Steinert U.
Published: May 2020

Das spinozelluläre Karzinom ist der zweithäufigste diagnostizierte Hauttumor in Deutschland und die Inzidenz nicht melanozytärer Hauttumoren ist weltweit steigend. Solange eine ambulante Behandlung möglich ist, wird dies sowohl vom Patienten häufig gewünscht und ist weiterhin ökonomisch sinnvoll. Im Rahmen der Therapie der aktinischen Keratosen gewinnt die Tageslicht-PDT (DL-PDT) zunehmend Bedeutung gegenüber der klassischen PDT.

Dieser Fall beschreibt die neoadjuvante DL-PDT als Therapiemöglichkeit zur Demarkation eines gesicherten, aber klinisch nicht abgrenzbaren spinozellulären Tumors mit nachfolgender R0-Resektion. Die DL-PDT ersetzt hierbei nicht die mikrografisch kontrollierte chirurgische Exzision mit histologisch tumorfreien Rändern, ergänzt diese jedoch, um eine kleinere Exzision vornehmen zu können.
Potential Drug interactions with Drugs used for Bipolar Disorder: A Comparison of 6 Drug Interaction Database Programs
Authors: Monteith Scott , Glenn Tasha , Gitlin Michael , Bauer Michael
Published: May 2020

Background Patients with bipolar disorder frequently experience polypharmacy, putting them at risk for clinically significant drug-drug interactions (DDI). Online drug interaction database programs are used to alert physicians, but there are no internationally recognized standards to define DDI. This study compared the category of potential DDI returned by 6 commercial drug interaction database programs for drug interaction pairs involving drugs commonly prescribed for bipolar disorder.

Methods The category of potential DDI provided by 6 drug interaction database programs (3 subscription, 3 open access) was obtained for 125 drug interaction pairs. The pairs involved 103 drugs (38 psychiatric, 65 nonpsychiatric); 88 pairs included a psychiatric and nonpsychiatric drug; 37 pairs included 2 psychiatric drugs. Every pair contained at least 1 mood stabilizer or antidepressant. The category provided by 6 drug interaction database programs was compared using percent agreement and Fleiss kappa statistic of interrater reliability.

Results For the 125 drug pairs, the overall percent agreement among the 6 drug interaction database programs was 60%; the Fleiss kappa agreement was slight. For drug interaction pairs with any category rating of severe (contraindicated), the kappa agreement was moderate. For drug interaction pairs with any category rating of major, the kappa agreement was slight.

Conclusion There is poor agreement among drug interaction database programs for the category of potential DDI involving psychiatric drugs. Drug interaction database programs provide valuable information, but the lack of consistency should be recognized as a limitation. When assistance is needed, physicians should check more than 1 drug interaction database program.