bluuebunny/crossref_metadata_2025 huggingface dataset:
Protective Workover Fluid for Biological Limestone Reservoir in Dagang Oilfield Technology Research
Authors: Yang Xiaochun , Xu Xiaogang , Wang Xiaofang , Fan Songlin , You Qiuyan
Published: January 2021

Due to the development of the biogenic limestone Cracks of reserves and dual-media, the pore permeability is larger different, the sensitivity is strong, and the risk of lost circulation is large, which leads to the serious formation pollution caused by the lost circulation. According to the reservoir characteristics, the temporary blocking system has been developed, Its temporary blocking component size expanded to 5μm∼2.0mm, Block size expanded from 0.2mm to 1.0mm, the limestone temporary blocking rate’s minimum is 90%, invasion depth of sand bed is less than 3 cm, temporary blocking component degradation rate is higher or equal to 90%. Excellent technical application, the average recovery period of the pump well was reduced from 7 days to 3.7 days, and the recovery rate was increased from 70% to 97%.
Experimental Study on Residual Bearing Capacity of Existing Prestressed Concrete Hollow Slab Beam
Authors: Wang Baoqun , Xing Dejin , Chen Chengyong , Tian Zhongnan , Xu Gangnian
Published: January 2021

Through the reconstruction and expansion of expressway, it has become the new normal of expressway construction in China to improve the traffic capacity and operation service level of the existing road. However, the reconstruction and expansion of expressways are faced with problems such as the degradation of the existing bridge performance and the original design bearing capacity that can’t meet the current load standards, which restrict the full utilization of the existing expressway bridges. Based on the reconstruction and expansion project of Beijing-Shanghai Expressway (Shandong section), this paper selects the prefabricated and prestressed concrete (PC) simply supported slab bridge with span of 10m and 13m. It evaluates the bearing capacity of HSB based on technical condition checking calculation and load test, and carries out the ultimate bearing capacity test at the same time. According to the checking calculation of bearing capacity and test results, it is concluded that the technical condition of the existing bridges in the expressway (Shandong section) is evaluated as class 1 prefabricated simply supported slab bridge. By adding 150mm integral cast-in-place pavement, the bending capacity of the HSB in the mid of span section meets the current load standard, while the shear capacity of supporting point section does not meet the current load standard, but the difference is within 5%. After the reconstruction and expansion of expressway, the existing bridges mainly bear the load of small vehicles, the load effect is far lower than the current load standard, the bearing capacity meets the current load standard, and can be fully utilized in its original state.
Comprehensive identification method of volcanic gas and water layer in Anda area
Authors: Yang Qin
Published: January 2021

The structure of Anda area is located in the north of Xujiaweizi fault depression, which is a NNE trending depression, with west fault and East exceeding. The main target reservoir in this area is volcanic reservoir of the third member of Yingcheng formation. The reservoir lithology is complex, the physical property changes greatly, and the heterogeneity is strong, which brings some difficulties to the gas and water layer identification in this area. Due to the special influence of lithology and pore structure of volcanic rock, the relationship between gas and water in volcanic reservoir is relatively complex. Gas wells show different productivity characteristics and water production characteristics in the production process. Based on logging, logging and gas testing data, this paper analyzes the response characteristics of gas and water layer logging, establishes gas and water layer identification chart, comprehensively identifies gas and water layers, further deepens the understanding of gas reservoir geology in this area, and improves the gas well development efficiency.
Research on Marine Disaster Prevention and Mitigation Information Platform System Based on Big Data
Authors: Chen Chen , Yuxi Sun , Jun Tan
Published: January 2021

Affected by human activities, marine pollution is becoming more and more serious. Our coastal zone, estuary and bay ecosystems have been damaged to varying degrees. The application of marine ecological environment monitoring sensors can realize real-time monitoring and rapid early warning of the marine environment, which is of great significance for preventing marine disasters and regulating the contradiction between the development of the marine economy and the environment. Based on this research background, the thesis used TERRA/AQUA-MODIS, SARCOSMO-1/COSMO-2 and HY-1B satellite, aviation, ship, shore-based and other multi-source, multi-temporal monitoring data to build a centralized marine environment monitoring and information extraction The integrated business system integrated with functions such as integration, data collection, forecasting and early warning, and product release provides timely information on the ecological environment to the government and relevant departments during the emergency period, providing vigorous technology for disaster prevention and mitigation of the government and relevant departments The guidance provided a basis for starting the emergency plan in time.
The Development of Diesel Particulate Filter Technology
Authors: Wang Zhibin , Liu Peng , Li Haiming , Li Rui , Pan Xiaobing , Zhao Yu
Published: January 2021

With the rapid development of internal combustion engine technology and the widespread popularity of diesel locomotives, the exhaust pollution of internal combustion engines has become a factor that cannot be ignored in air pollution. Particulate matter in diesel engine exhaust is an important culprit in diesel engine exhaust pollution, the harm of which has been widely recognized. This paper introduces the hazards of particulate matter in diesel exhaust, and summarizes DPF for particulate emissions and the regeneration technology of DPF.
Study on biodiesel synthesis based on Micro-organism Community
Authors: Zheng Chaocheng
Published: January 2021

In this paper, microorganism for high lipase productivity was screened before purification, immobilization for biodiesel synthesis. High lipase producing strains such as Candida, Bacillus, Aspergillus, Pseudomonas sp. were screened and selected from oil-polluted soils. Micro-organisms were cultured for about two days after the elution of 100000-fold, among which the best showed higher hydrolysis ability on fatty acid glycerides. Lipase productivity was improved 10-fold by mutation methods of ultraviolet treatment, and the most suitable time for treatment was 30 s. Furthermore, NTG was utilized to strengthen this mutagenic effect before selecting four strains with higher lipase productivity. These micro-organisms were cultured at their best conditions, which resulted in high lipase production after one day fermentation in 50 mL container at 29 °C.
Study on enzymatic activity and lipase catalysis by lipase high-yield strain
Authors: Zheng Chaocheng
Published: January 2021

In this paper, microorganism for high lipase productivity was screened for immobilization in biodiesel synthesis. Strains with high lipase productivity were analyzed at nucleic acid level with special universal primes. In addition, reaction course, theory of lipase adsorption, lipase specificity on substrate, kinetics, and the application of enzymatic synthesis in biodiesel were investigated. The tests of lipase productivity, lipase purification, lipase immobilization, and lipase application in biodiesel were carried out indicating that lipase from the above micro-organisms was able to catalyze the transesterification reaction of rapeseed oil with moderate oleic aicd content.
Study on Ultrafiltration-Reverse Osmosis Technology in The Treatment of Deep Ocean Water
Authors: Gao Chunjuan , Wu Haihong , Guo Shuyuan , Zhang Yanan , Ma Laibo
Published: January 2021

As a high-quality water resource, deep ocean water (DOW) has aroused widespread interest. In this study, ultrafiltration-reverse osmosis technology was used to desalinate deep ocean water to prepare pure deep ocean water. By controlling the process conditions, the ultrafiltration-reverse osmosis system obtained a desalination rate of 98.3%, and the product water met the requirement of relevant standards.
Joint Optimal Operation of Wind Power Plant and Cascade Hydropower Station
Authors: Jiang Di , Wang Mingkai , Sun Wentao , Wu Yang
Published: January 2021

With the depletion of fossil energy, the whole people advocate energy conservation and emission reduction, making the scale of wind power integration increase. While wind power has fluctuating and intermittent characteristics, this paper develops a short-term combined operation strategy of wind and water using the flexible regulation characteristics of cascade hydropower stations. To ensure full access to wind power, reduce the impact of wind power fluctuations as little as possible. A multi-objective short-term optimal scheduling model with the minimum variation of combined wind and water output and the largest total power generation is established considering the constraints of storage capacity, discharge flow, reservoir water level, output of each power station, and power transmission section. Aiming at the shortcomings of traditional particle swarm optimization algorithm, such as slow convergence rate and fall into optimal local solution easily in the late search, dynamic inertia weight and learning factors are introduced and applied to model solving. The simulation results show that the cascade hydropower station can effectively stabilize the wind power fluctuation, improve the wind power consumption level, increase the power generation of the system, and ensure the safe and stable operation of the power system.
Research on the Development of Chinese and Foreign Denture Technology
Authors: Chen Lijuan , Zhao Yifan
Published: January 2021

Dentures are often referred to as "dentures". Just like the "prosthetic leg" and "prosthetic limb" are called "prosthetic limb", it is a general term for the restoration made after the missing of some or all teeth of the upper and lower jaw teeth in medicine. In recent years, with the improvement of living standards and the abundance of material life, more and more people will choose to install dentures after missing teeth, and denture technology has also developed rapidly. This article is in recent years. A brief investigation and research was carried out on the development of science and technology.
Research on Pressure-based Detection Technology for Partial Overheat Insulation Defect of Oil-less Power Equipment
Authors: Yu Qunying , Liu He , He Qiuyue , Zhang Guozhi , Zhang Zheliang , Zhang Xiaoxing
Published: January 2021

Pressure monitoring technology is the current state monitoring research hotspot of oil-less power equipment. Aiming at the lack of pressure change characteristics caused by overheating insulation defect of oil-less power equipment, this paper studies the pressure change characteristics of 110kV oil-immersed power transformer under local overheating insulation defect. Overheating defect belongs to the low temperature overheating, temperature rise gradient is 50 °C . Analysis of the experimental results indicates that pressure change trends show exponential, in the initial stage, the pressure increased sharply, then it increased slowly, and finally it tended to be stable; the increase of pressure in 50 hours ranged from 1kPa to 3kPa, and the pressure increase was obvious, which indicated that the online monitoring of local overheating insulation defects of the casing could be achieved by pressure monitoring technology, and finally the casing pressure change law was analyzed theoretically.
Using Spatial LMDI to Decompose Electricity Consumption Intensity in Shandong Province from 2015
Authors: Xue Wanlei , Zhao Xin , Yang Yongqi , Jia Mingzhu , Sun Xiangdong
Published: January 2021

In this paper, through the construction of spatial LMDI decomposition framework, we decompose the influencing factors of Shandong Province's total electricity consumption intensity from 2015 to 2018 into two parts: city’s economic growth factor and city’s electricity consumption intensity factor. The results show that, in this period, the increase of city’s electricity consumption intensity is the main reason for the increase of total electricity consumption intensity in Shandong Province. However, the city’s economic growth slightly slow down the increase of the total electricity consumption intensity. Compared with other cities, the growth of electricity consumption intensity in Binzhou is the main driving force of total intensity growth, accounting for 69.35%. However, 6 cities (Dezhou, Jining, Jinan, Laiwu, Liaocheng, Zibo) play a negative role in the rise of Shandong's overall electricity consumption intensity.
A new site selection method applied to Synchronous condenser’s suppressing transient over-voltage at the sending end of new energy resources
Authors: Zhao Mengyang , Tang Xiaobo , Wang Yu , Wang Qilun , Sun Zhongqing
Published: January 2021

The transient over-voltage will occur in the wind farm near the DC system after commutation failure. In order to reduce the transient over-voltage of wind power plant after the accident of off - grid, improve the stability of the system. This paper mainly studies the placement of the Synchronous condenser in the wind power station. Firstly, the advantages of the Synchronous condenser are analyzed theoretically, and the operation characteristics of the Synchronous condenser under the fault of the DC system are analyzed in detail. Secondly, based on the transient over-voltage area method, a transient over-voltage degree index is proposed, and this index is used as the optimal placement method. Finally, the proposed transient over-voltage index was verified in the PSD-BPA model. The results show that the index is correct and effective in determining the placement point of the Synchronous condenser in the new energy supply.
Research Status of Gesture Recognition Based on Vision: A Review
Authors: Tian Jun , Zhang Weilie , Zhang Tao , Li Guopeng , Long Zhang
Published: January 2021

Gesture control, as a new type of interactive method, has the characteristics of rich expression, convenient control, and fast. It has huge application prospects in entertainment, home furnishing, and industry. Gesture recognition is the basis of gesture control. Gesture recognition technology based on visual detection acquires gesture information in a non-contact manner, which enables the operator to have a better operating experience and is favored by scholars at home and abroad. In order to fully understand the existing research methods of visual gesture recognition, firstly, the basic process of visual gesture recognition is explained. According to the principle of the gesture recognition method, it is divided into gesture recognition based on traditional methods and gesture recognition based on deep learning. And the specific methods are analyzed and summarized in detail. Finally, the technical difficulties of visual gesture recognition are analyzed and discussed, and the development trend of gesture recognition based on vision is prospected.
Experimental Study on Mixing Time under Different Operation Parameters in CAS Process
Authors: Han Lihao , Li Yuehua , Han Lining , Liu Yanxia , Huang Weiqing , Qi Suci , Guan Xin , Yuan Jianlu
Published: January 2021

In view of the problems existing in bath mixing, a water model has been established to study the mixing time of CAS process on the basis of similarity principle. In this paper, the influences of the bottom blowing position, bottom blowing rate, the immersion depth, the position and the size of the impregnation cover on bath mixing time have been investigated in detail. To ensure the amount of slag in the impregnation cover as little as possible, it would be better that the slag area is equal to the diameter of impregnation cover. The optimum bottom blowing position is located at 0.5r, the bottom blowing rate is between 0.18 m3/h and 0.22 m3/h, and the immersion depth of impregnation cover is about 60 mm.
Assessment of Electrical equipment status in distribution network based on multi-source data fusion
Authors: Chen Shaonan , Liang Shuo , Li Shan , Zhou Yangjun , Yu Xiaoyong
Published: January 2021

In order to adapt to the lean maintenance and operation and maintenance requirements of the distribution network, and to improve the utilization of distribution network data, a method for identifying the operating status of distribution network equipment based on multi-source data fusion is proposed. First, the status identification and evaluation requirements of the network and equipment in the operation of the distribution network are analyzed. Then the multi-source data fusion principal is introduced, and the multi-source information sources of the distribution network equipment is explained. An identification method for the state of distribution network equipment based on association rules and entropy weight method fuzzy analysis is proposed, and the evaluation and identification process is given. Finally, the transformer equipment is taken as an example to verify the equipment status identification method proposed in this paper, and demonstrate the effectiveness of this method.
An Active Power Failure Early Warning Probability Model Based on Support Vector Machine Algorithm
Authors: Wang Yongming , Li Yiran , Liang Hongchi , Weng Xiaochun , Huang Meimei
Published: January 2021

The occurrence of power grid blackout will cause major production equipment damage, cause major economic losses, or even cause casualties in some extremely serious cases. It is necessary to upgrade the technology of traditional power grid so that emergency measures can be taken when unexpected cascade failure occurs. In this work, an active power failure warning probability model is proposed for smart grid warning system. First, probabilistic evaluation of system performance is carried out to generate the historical database required by cascade state. Then, the support vector machine (SVM) algorithm is used to train the historical database, and power failure is predicted by the support vector machine (SVM) binary classifier. Finally, the proposed model is validated by IEEE 30 node system. The proposed model can well understand the essence of cascade failure and can proactively predict cascade failure, which is helpful for the planning and maintenance of power grid system.
Research on Key Technology of Primary Protection System in Intelligent Substation
Authors: Wen Kaijun
Published: January 2021

The smart substation in this paper is a model. Through the research of its primary system, the project construction scale and design scope, electrical main wiring, short-circuit current and main equipment selection, insulation coordination and overvoltage protection, cable facilities, power distribution equipment, etc. To conduct research. Analyze application status detection, fully optimize design, and improve operation and maintenance management. Combining the online monitoring and sequential control operation of the intelligent substation, the research of the secondary protection design scheme is carried out. It analyses the system dispatch automation, integrated power supply system, system and station communication, secondary equipment cabinet and layout, component protection and automatic equipment, etc., focusing on online monitoring, sequential control operation and operation and maintenance management. With the maturity of online monitoring technology, the realization of sequence control operation technology and the application of optical fibre network in real-time systems, the safety level and operation and maintenance management of smart substations will surely be better improved.
A Method of Judging the State Time Point of Mechanical Characteristic Switch
Authors: Tang Qi , Wu Lihui , Luo Rongbo , Li Guowei , Wang Junbo , Liu Shaohui
Published: January 2021

Aiming at the problem of judging the opening / closing time node by directly detecting the switch quantity in the process of detecting the mechanical characteristics of the switch cabinet, this paper puts forward a method to calculate the opening / closing time node with the CT secondary current as the original data. This method through the acquisition of CT secondary side current, current data of any phase, calculating threshold, intercepting alternative data, calculating slope and rate of change, the time node of opening and closing is obtained, solve many scenarios acquisition switch quantity and difficulties, judgement open/close time and the problem of low accuracy of switch performance. Through practical application, compared with the traditional acquisition of switch quantity to judge the opening / closing time node, the method proposed in this paper has universality, low detection difficulty and high judgment accuracy of opening / closing time node.
Reliability design of vehicle wiring harness
Authors: Yuan Shengrui , Dang Xunyi , Yang Xiaoyu
Published: January 2021

This paper introduces the method of the reliability design of vehicle wiring harness system, and puts forward some feasible schemes on the reliability design of wiring harness, and combines the reliability requirements into the design, so as to reduce the reliability defects caused by unreasonable design and fundamentally improve the reliability of wiring harness system.
Multi-robot Automatic Production Line
Authors: Lu Ye , Wang Kai
Published: January 2021

In order to make better research on the intelligent manufacturing process, the automatic production line based on multiple industrial robots is introduced. Firstly, the production line is constructed, and then the composition of each module in the line is described. Secondly, taking one of the six-axis robot as an example, the kinematics is analyzed with D-H method. The trajectory of the robot is planned and stimulated with the hybrid curve method as well as Matlab Robotics Toolbox. Finally, the communication and control process of the system is addressed.
A Mixed-Integer Linear Programming for Nodal Clearing Price in Day Ahead Market Considering Security Constraints
Authors: Sun Guanghui , Wang Xiaowei , Yang Libo , Lu Peng , Ma Bin , Lv Hao , Yuan Long
Published: January 2021

A nodal clearing price model in day ahead market considering security constraints is established. First, the intra-region and inter-region transaction modes are explained, and the order types are shown. The clearing model takes the total social welfare as the goal, considers the security constraints of the network, and specifies the market clearing price expressed by the Lagrangian multiplier. Then the mixed linear programming algorithm is used to solve the model in this paper, and a verification method based on the N-1 criterion is performed. Finally, a numerical case is performed to calculate the clearing price of the network, which illustrates the effectiveness of the proposed method and model.
Simulation and Analysis of Pulse Driving Circuit for Semiconductor Laser
Authors: Miao Weitong , Huang Jun , Chen Haitao , Wang Yuchen , Wang Lei , Ding Shuai , Gan Yupeng
Published: January 2021

Aiming at the problem of how to provide high amplitude, short pulse width and high stability driving power supply for semiconductor lasers, this paper proposes a method to realize constant current pulse output by combining buck circuit, energy storage network and linear regulation module. The hysteresis control of buck circuit is used to control the voltage of energy storage capacitor, and then the PI module is used to adjust the MOSFET working in the linear region to ensure the constant current output on the load. PSPICE software is used to simulate and analyze the designed pulse driving circuit. Through simulation, we can clearly and intuitively understand the influence of various parameters in the circuit on the circuit, so as to optimize the circuit design. The simulation results show that the circuit can achieve high-power pulse constant current output with amplitude of 30A and rise time of 3us on the semiconductor laser load, which provides a reference for the subsequent actual circuit test.
Source Load Forecasting of Customer-side Multi-energy System Based Feature Engineering
Authors: Liu Qian , Wang Jingtao , Zhang Yuanbo
Published: January 2021

Existing research mainly focuses on the single forecasting target and algorithm optimization, rarely mentions how to extract features for forecasting. For the source and load data of the customer-side multi-energy system, the influencing factors are complex and coupled. So, the quality of features gradually becomes the bottleneck that limits its forecasting accuracy. In this regard, based on EDA technology, this paper proposes a source and load forecasting method of customer-side multi-energy system based on feature engineering. First, combined with domain knowledge, perform a more systematic and complete feature analysis for the original observation data. Through this process, we can extract time features, statistical features and combined features. Subsequently, according to the characteristics of the data, the corresponding algorithm is selected to build a forecasting model. Finally, conduct two experiments based on source-side data and load-side data respectively, which proved that this approach can significantly improve the forecasting accuracy.
Research on Building a Power Market Regulation System in Gansu Province and Some Possible Monitoring Methods
Authors: Yang Chunxiang , Shi Yujie , Hao Ruhai , Zhong Xinrui , Zhang Tianyu
Published: January 2021

With the deepening marketization of the electric sector, building power market regulation systems is worthy of concern. As the shaping of the spot market continually goes on in Gansu, market monitoring institutions should be built, market monitoring mechanism should be established, and market monitoring methods should be implemented. This article discusses the situation in Gansu, including the power structure and trading patterns. Then discussed the necessity and path to build a market regulation system. With possible monitoring methods illustrated, this article implemented the methods on past market data, analysed market forces situation, and proposed possible future investigations.
Research on the conductivity of circuit on fabrics based on inkjet printing and electroless deposition technology
Authors: Guo Hua , He Yongyan , Yue Wangfeng , Guo Xinyu
Published: January 2021

Traditional silicon semiconductor substrate based electronic manufacturing has the shortcomings of non-bending, poor biocompatibility, and high cost. Fabric is more suitable for wearable electronic substrate due to its advantages of flexibility, air permeability, and skin-friendliness. We studied the manufacture of the conductive circuit based on inkjet printing and electroless deposition technology and got excellent conductivity and high dimensional accuracy circuit on fabric substrates. Three kinds of commonly used fabric materials cotton, polyester/cotton and polyester are selected to study the key work of surface pre-treatment, inkjet printing circuit pattern, and electroless deposition. The synergetic effect of SU-8 and P4VP (poly-4-vinylpyridine) on fabric ensures that the pattern retains its original size rather than diffusing. The distance between adjacent electric lines is no less than 0.3mm. With the extension of copper deposition time, the copper deposition layer becomes more and more uniform and dense. Sheet resistance reached 0.01Ω after 2 hours of copper deposition. The performance of all three kinds of fabric is similar. And cotton fabric had the best water lock performance. This technology has great potential for promotion and development in the application of intelligent textiles in the future.
Clinical observation of treating Meniere’s syndrome by combining modified Zhenwu decoction and acupuncture at Taichong acupoints
Authors: Fang Fang , Han Guanqing , Wang Zhen
Published: January 2021

Objective: The aim of the research is to observe the therapeutic effect of combination of modified Zhenwu decoction and acupuncture at Taichong acupoints on Meniere's syndrome. Methods: Eighty-eight patients with Meniere's syndrome admitted in the traditional Chinese medicine (TCM) clinic of the hospital were randomly divided into four groups: a TCM group, an acupuncture group, a combined treatment group, and a western medicine group (n=22 in each group). Modified Zhenwu decoction was administrated in the TCM group; acupuncture at Taichong acupoints in both feet was performed in the acupuncture group; the combined treatment group received treatment applied in both the TCM and acupuncture groups simultaneously; and the western medicine group was treated with a vertigo drug, betahistine mesylate tablets. Before treatment, all patients were examined using the rating scale of severity of vertigo and the vestibular symptom index (VSI), to compare score differences. Conclusions: The four therapies all showed significant therapeutic effects on Meniere's syndrome. The comparison among groups revealed that the combined treatment group has better therapeutic effects than the other three groups, exhibiting a significant superiority (P < 0.05).
The application of Internet of things technology in integrity management of urban gas pipe network
Authors: Jiang Shukun
Published: January 2021

On the Internet of things technology in the gas pipeline integrity management the present situation of the study is less. This paper aims to improve the integrity management level of gas pipe network and combines the mature experience of Internet of things in the integrity management of long-distance pipelines. The integrity management system of urban gas pipe network based on Internet of things technology is proposed, and the main application scenarios are analyzed. The results show that the application of Internet of things technology improves the uniformity of data collection in pipe network operation management, promotes the sharing of data, and avoids multiple data conversion. The detection results of various sensing means, methods and instruments can be integrated to ensure the reliability of risk assessment and integrity assessment. To realize the scientific and reasonable allocation of limited human resources and equipment, and to evaluate the effectiveness of the existing integrity management system, to achieve the goal of gradually improving the integrity management. This paper provides specific guidance and ideas for urban gas pipe network management and operation units to carry out high level integrity management.
Application of effect-surface method in enzymatic hydrolysis of corrugated Paphia undulata by microwave acid
Authors: Chen Xin , Chen Hua , Sun Huili , Liang Xin , Xu Feng , Zhang Yongli
Published: January 2021

Application of effect-surface method in enzymatic hydrolysis of corrugated Paphia undulata by microwave acid was studied. In this experiment, the process was optimized, and the influence of microwave acid combined treatment on enzymatic hydrolysis of corrugated Paphia undulata was explored by means of star-point design and effect-surface analysis. The experimental results show that the acid type and concentration of acid, acid type and power of microwave, acid concentration and microwave power, microwave power and microwave time affect peptide yield, under the optimal process conditions, peptide yield can reach 85.67%, the value and the response surface model prediction is very close to 86.62%, star design - response surface model can be applied to small molecular peptides hydrolyzed well optimization of process conditions.
Talent Demand Forecasting Model with Practicability Based on the Theory of ARIMA
Authors: Yu Bozhong
Published: January 2021

The urban development depends on talents, meanwhile, different types of talent demand affects the development direction of a city. The actual talent demand is affected by many factors, and can reflect the economic capacity of a city to a certain extent. Our goal is to predict the potential talent demand of A-City in the next three years. First, we establish a multiple regression model and come to the conclusion that the relationship between talent demand and job demand is lineal and desired profession has a positive effect on talent demand while desired educational background has a negative effect on talent demand. Based on the above analysis results and the theory of ARIMA, we establish a talent demand forecasting model. Finally, we predict the talent demand and three factors of A-City in the next three years.
Development status and prospect of aviation materials in China
Authors: Shi Yuihin
Published: January 2021

Aviation materials are closely related to the development of aviation technology, also indirectly affect the air force. With the rapid development of advanced technologies, the achievements in aviation could well represent the strength of a country. In this paper, the characteristics, status and functions of aviation materials are respectively introduced and summarized in this paper, note that the representative aviation materials, i.e., structural materials (e.g., aluminum alloy, titanium alloy and advanced composite materials) and functional materials (e.g., wave-transmitting composite materials, and wave-absorbing stealth composite materials) are described in details with specific cases. Finally, the future development of aviation materials is analyzed and given.
The organic combination of calligraphy art and environmental design opens up a new path for the development of contemporary calligraphy
Authors: Yin Linjia
Published: January 2021

In the flood of The Times, environmental design in our country is often impacted by foreign culture and loses the flavor of local culture. There are some existing literatures that study the problems of contemporary calligraphy and the application of calligraphy elements in the environment. But there is no discussion on how to improve calligraphy and how to combine contemporary calligraphy with environmental design on this basis to provide help for the inheritance of calligraphy. In view of this situation, this paper opens up a new and feasible way for the inheritance of contemporary calligraphy from the perspective of environmental design. Based on the needs of environmental design and the problems in the creation of contemporary calligraphy reflected in various exhibitions, this paper puts forward corresponding countermeasures for the development of calligraphy, and provides practical Suggestions for the inheritance of traditional culture and the innovation of modern environmental design.
Analysis of Air Pollutant Emission Differences and Emission Reductions of Coal-fired Stoves of Different Residents
Authors: Shi Weiwei , Liu Yongqian , He Yiqun
Published: January 2021

In order to explore the differences in air pollutant emissions of different types of stoves, this study selected five common new types of residential coal-fired stoves (square coal stoves, baffle heat exchange stoves, kang heating and cooking integrated stoves, Gasification forward burning and gasification reverse burning stoves) Simulated combustion and atmospheric pollutant emission level monitoring in the laboratory to quantitatively evaluate the environmental effects of different stoves, identify the influencing factors and causes of differences in pollution emission levels, and propose furnaces Suggestions for improvement of pollution reduction such as R & D and design. The results show that: ① The emission of air pollutants differs greatly among different stoves, and the intensity of pollution emitted by the stoves with kang heating and cooking is the largest. The emission intensity of the three types of atmospheric pollutants (SO2, NOx and particulate matter) is 2.9 kg t-1 It is 1.6 times the average value; stoves using square coal technology have the lowest air pollutant emission intensity, which is 65% of the average value. ②The emission of gaseous pollutants in different furnaces at different combustion stages also showed obvious differences and characteristics. During the fire stage, the NOx emission concentration of the square coal stove is 0.49mg ⋅ m-3, which is 45% ∼ 72% lower than that of other types of stoves; the SO2 emission concentration of the gasification anti-burning stove is 1.38mg ⋅ m- 3. Compared with other types of stoves, the maximum reduction is 28%. ③The factors that affect the emission of atmospheric pollutants of the stove include the application technology and the type of combustion. The stoves with square coal and gasification anti-burning technology have better environmental benefits, but the economic costs of the two types of stoves are 20,000 yuan and 18,000 Yuan, significantly higher than other types of stoves. ④Considering the differences in pollution emissions from different stoves, it is recommended to adopt differentiated economic policies and strict emission and product standards, promote the use of energy-saving and environmentally friendly stoves, and reduce the emission of atmospheric pollutants from coal-fired stoves.
Research on Financial Information Quality Evaluation System of Listed Companies in Low-carbon Environment
Authors: Xie Libin , Huang Miaohuan
Published: January 2021

The era of low-carbon puts forward higher requirements for information transparency of listed companies. This paper analyzes the quality of financial information disclosure of listed companies as the content, and determines the quality evaluation system of financial information of Chinese listed companies under the background of low-carbon. The system has three first-level indicators of "timeliness", "authenticity" and "integrity", ten second-level indicators and nineteen third-level indicators. Then combined with the analytic hierarchy process and the entropy weight method to calculate its weight, a listed company financial information quality evaluation index model was constructed, which provided a reliable basis for listed companies to improve their competitiveness in the low-carbon wave.
Research on regional economic growth differences in China under the Internet Environment
Authors: Wan Linghong
Published: January 2021

Since the reform and opening up, with the rapid development of computer network technology represented by Internet technology, China's economic development level has made remarkable achievements. However, in the process of rapid growth, the imbalance of regional economic development has also emerged. The prominent performance is that there are great differences in regional economic growth in the East, the middle and the west, and the government has actively carried out macro-control. In order to support the introduction of national regional economic regulation and control policies, a variety of studies on regional economic growth are in full swing. At present, there are also problems such as the lack of independent innovation ability in various researches. It is necessary to study and solve these problems in the practice of regional economic development, so as to enhance the comprehensiveness and foresight of the research.
The Structural Design of the Threaded Part of the Premium Connection Tubing
Authors: Hao Long
Published: January 2021

The thread form of the premium connection tubing in unconventional gas well is usually API round thread, which has poor connection performance and make-up performance. In response to this problem, this research redesigned the structure of the threaded part of the premium connection tubing, and applied the improved buttress thread of the casing to the tubing to improve the connection performance and make-up performance. The relevant research ideas or results can be used as a reference for subsequent product development.
Research on Collaborative Innovation Network Mechanism of General Aviation Enterprises Based on Complex Network
Authors: Zhang Liang
Published: January 2021

In order to better promote the collaborative innovation ability among general aviation enterprises and promote the high-quality development of general aviation industry, this paper is based on the social network relationship theory and embeddedness principles, using the general aviation enterprises as structural embedding to determine the key nodes of the innovation network. The value chain, supply and demand chain, and information sharing behavior are used as relational embeddings to build a general aviation enterprise chain innovation network. On this basis, from the aspects of network topology graph, node degree, clustering coefficient, etc., quantitative analysis of the structure and characteristics of the general aviation enterprise innovation network is carried out, so as to lay a foundation for the functional orientation of the main body of collaborative innovation in the aviation industry. The research shows that: At present, the collaborative innovation of general aviation enterprises has not formed a scale. The inn ovation of enterprises mainly relies on large-scale general aviation enterprises with stat e prefix. Most general aviation enterprises have weak innovation capabilities, and the s mall and medium-sized general aviation enterprises are in the initial development stage. Therefore, it is necessary to strengthen the support of various types of general aviation enterprises, provide support in terms of funds and policies and so on, so as to promote the improvement of collaborative innovation capabilities among various types of general aviation enterprises
A Research Review on the Transformation of Old Districts
Authors: He Weiyi , Li Tianyi
Published: January 2021

With the continuous development and progress of urban civilization, the transformation of old districts has become an inevitable trend of urban renewal and development. This paper uses literature research methods to summarize the current status of research on the renovation of old communities at home and abroad and explore the future research directions. It is found that the existing research on transformation of old districts experience and countermeasures can be broadly divided into two categories: renovation status, problems and countermeasures and Retrofit evaluation category. Certain achievements have been made in the research on the renovation technology and management of old communities.
Comparison of actual Levelized Cost of Electricity of solar thermal concentrating solar power plants
Authors: Boretti A , Castelletto S , Al-Kouz W , Nayfeh J
Published: January 2021

Forecasts based on modeling of concentrated solar tower power plants with thermal energy storage of 10 hours daily predict the production of dispatchable electricity at 6 c/kWh. Currently, there is no plant utility size in operation featuring this technology and at this predicted cost. The recent experience of Crescent Dunes, an example of this type of technology, should be used to better estimate the current cost of dispatchable electricity. Crescent Dunes started operation in October 2015 demonstrating since the very beginning the lack of maturity of this specific technology, experiencing a lack of production or no production at all, every single month since starting operation. The 110 MW plant (currently not in operation) provides a cost, excluding repairs and maintenance costs, of 2.38 $/kWh of unpredictable electricity. This experience suggests that every prediction of costs and performances should be based on data of plants built and operating, to avoid the use of models not yet validated to predict performances of novel plants. By surveying other technology based on parabolic through, the current actual costs are here determined for specific latest operating plants in the range of more realistic 8-12 c/kWh.
Identification of paddy fields using temporal NDVI changes in Minamiaso Village, Kumamoto Prefecture, Japan to estimate groundwater recharge
Authors: Amano H , Iwasaki Y , Ichikawa T
Published: January 2021

In Minamiaso Village (Kumamoto Prefecture, Japan), land covers of forests, grasslands, and paddy fields play an important role in groundwater recharge. The land covers have been changed in a past few decades by agricultural systems and natural disasters: landslides, slope failures, and damage of irrigation canals caused by the 2016 Kumamoto earthquake in Japan. In this study, we extracted training data for classifying the land covers, and detected the temporal change of NDVI (Normalized Difference Vegetation Index) for each land cover. To quantify the impact of past land cover change on the groundwater recharge, we need to grasp the area of each land cover with the different hydrological parameters such as infiltration capacities. In the case of paddy fields, its distribution also should be known because the infiltration rates that we investigated vary depending on the paddy fields. We attempted to identify the paddy field distribution by the obtained NDVI values, and confirmed that the paddy field areas near the earthquake faults damaged by the earthquake where are still not usable were well distinguished. The paddy field distribution based on NDVI was almost matched with that based on SAR.
Non-destructive measurement of rice leaf dimension in 3D point cloud
Authors: Rattanasuwan P , Kumazawa I , Kasetkasem T
Published: January 2021

In order to try to improve the yield, knowing the expanding of a leaf by measuring its dimension can be one easy way to monitor the plant growth. While rice is considered to be one of the most important agricultural plant, their leaves are quite difficult to measure the size since they are mostly small and direct measurement could harm the plant. To do so, we deploy the non-destructive system to measure the dimension of the rice leaf from a point cloud. The proposed system takes only photos from a smartphone camera to produce the 3D model of a specific leaf using structure from motion and multi-view stereo. To measure the dimension of the rice leaf in metric units, the scale reference is placed into the scene before the photo taking process to involve it in the reconstruction result. From the reconstructed point cloud, the leaf veins can be extracted in order to find the accurate width of a leaf based on thresholding technique using combination of RGB and HSV spaces. By comparing with measured length of the leaf in point cloud with length of one block in scale reference, we can eventually obtain the distant between each leaf vein in the metric system unit.
Stability Analysis of High-Rise Steel Structure Joints Based on BIM Technology
Authors: Zhandong Ni
Published: January 2021

Because of its light weight, good orientation, strong seismic performance, high degree of industrialization, and short construction period, steel structure has relatively high investment efficiency and is widely used at home and abroad. At present, steel structures have been widely used in various complex high-rise buildings. Many high-floor buildings have many changes in building shapes and large spans, and their analysis difficulty and accuracy requirements are very high. Therefore, the stability analysis of steel structures is particularly important. Under the action of strong earthquakes, the welded parts at the nodes of the assembled high-rise steel structure are prone to rigid fractures, which are the weakest parts in the entire steel structure frame, causing damage to the steel structure nodes, and severe damage can lead to the collapse of the entire frame. In view of this defect, it is necessary to pay attention to the research on the stability of the prefabricated high-rise steel structure nodes. In this paper, combined with BIM technology, taking high-rise buildings as the research object, the linear buckling analysis of the structure is carried out, and the buckling mode, buckling weak parts and buckling load of the structure are obtained. Through the analysis of these data, this article evaluated the influence of the giant beam of this structure on the structural performance.