bluuebunny/crossref_metadata_2025 huggingface dataset:
Preliminary study on disaster prevention planning system from the perspective of high-density urban environment
Authors: Xie Ziang , Dai Shenzhi
Published: December 2019

High-density development mode is a realistic and rational choice of urban space in the process of high-speed urbanization in China. However, as the disaster-bearing body of urban disasters, the high-density characteristics of urban space also make it vulnerable and sensitive in dealing with disasters. Therefore, how to strengthen the protection of urban disaster prevention facilities and continuously improve the adaptability and flexibility of the city is an important factor to promote the sustainable development of high-density cities, which has great research value. Based on this, this paper aims to study and summarize the disaster characteristics of the high-density global metropolis, and preliminarily explore the content of disaster prevention planning system in high-density urban environment, so as to provide a pertinent research basis for the relevant issues of high-density urban disaster prevention.
Distribution Characteristics and Pollution Assessment of Heavy Metals in Sediments of Zhushan Bay
Authors: Chen Fangyuan , Chen Xinmin , Zhu Fan , Sun Qi
Published: December 2019

The distribution characteristics of heavy metals in the columnar sediments of Zhushan Bay, Taihu Lake are studied. The Pearson correlation analysis and principal component analysis are carried out, and the pollution of heavy metals is evaluated. The highest mean concentration is found for zinc (Zn), followed by chromium(Cr), copper (Cu), nickel (Ni ), lead (Pb), arsenic (As), cadmium (Cd). The content of heavy metals in estuaries and open water is significantly higher than those in aquatic-terrestrial ecotone, and pollution accumulation occurs in the deep sediments. There is a significant positive correlation between Cr, Cu, Ni and Zn, which indicates their similar sources. The geoaccumulation index (Igeo) shows that Cr has the highest value, with moderately to heavily polluted. The pollution situation of the study area is improved after the desilting project of Taihu Lake, but the potential ecological risk index (RI) is still moderate to severe, among which Cd is the single factor that contributes the most to RI.
Numerical study on noise reduction of wind turbine blade vortex generator
Authors: Gang Li , Zhengtao Zhang , Pingguo Zou
Published: December 2019

At present, wind power is widely used, especially in near-residential areas, and blade noise has become an important factor affecting the installation and operation of the unit. Vortex Generator is a new technology that has been used by wind turbine blade manufacturers in recent years. At present, there are few studies on the changes of blade aerodynamic noise after the installation of vortex generators in China. In order to study the influence of vortex generators on aerodynamic noise, the flow field is simulated by numerical calculation method before and after the blade is installed with vortex generators. The visualization results are output and compared, and the parameters such as vorticity and pressure are analyzed. Secondly, based on the detailed parameters of the flow field, FW-H equation is used to calculate the sound source propagation, and the sound pressure level spectrum of the blade before and after the vortex generators added is obtained. The research shows that the vorticity increases in the vicinity of vortex generators and the downstream region, which promotes the mass and energy exchange between the upper fluid and fluid in the boundary layer, so the boundary layer separation is delayed, and the wake vortex subsides. The aerodynamic noise is low frequency noise, and the addition of vortex generators can significantly reduce the aerodynamic noise of the blade.
Influence of gas counter pressure injection molding parameters on shrinkage ratio of plastic part
Authors: Li Shuai , Ma Xiaofei , Wang Rui , Sun Xuemei , Sun Chengtong
Published: December 2019

Gas counter pressure (GCP) technology can increase the pressure of melt before flowing effectively. Therefore, it has a potential to reduce shrinkage ratio and improve dimensional accuracy of conventional injection molding part. The effect of different process parameters on the shrinkage ratio of molded parts was studied by means of S/N ratio and ANOVA. The results showed that GCP pressure was the most important factor affecting the shrinkage ratio of molded parts, followed by packing time, injection pressure, mold temperature, melt temperature and packing pressure. Meanwhile, the most optimal combination of process parameters and 1.27% shrinkage ratio of parts were obtained. Finally, the influence of different process parameters on the shrinkage ratio of molded parts was also analyzed.
Effect of Plastic Film Mulching on Fruit Quality of Citrus grandis cv. ‘Hongroumiyou’ and ‘Sanhongmiyou’
Authors: Wang Yan , Fu Xiaoke , He Wen , Chen Qing , Wang Xiaorong
Published: December 2019

Plastic film mulching (PFM) around fruit trees could effectively improve fruit quality by promoting fruit coloration and sugar accumulation. ‘Hongroumiyou’ and ‘Sanhongmiyou’ are mutated from Citrus grandis cv. ‘Guanximiyou’ possessing attractive appearance, rich nutritional ingredients. When they are introduced into Sichuan Province, the fruits revealed lower sugar accumulation and higher acid content than that in Fujian Province. We compared the fruit quality by mulching at 55, 85, 115, 145, 175 days after flowering. The results showed that mulch treatment had no significant effect on the external quality of ‘Hongroumiyou’ and ‘Sanhongmiyou’. While it could effectively improve the internal fruit quality, including promotion of total soluble solid and vitamin C, and decrease of total acid. The best effect on the improvement of fruit quality was mulched at 115 days after flowering for ‘Hongroumiyou’ and 145 days after flowering for ‘Sanhongmiyou’. In addition, mulching cultivation also avoided tree death resulted from the rootrot atrophy because of a long-term flooding. It is important to promote film mulching cultivation in the pummelo production in Sichuan Province.
Current Situation and Problems of MBR Treatment Process in Dye Wastewater
Authors: Li Qin , Dong Kun , Tu Yue , Jiang Lei , Li Xiangmin , Li Haixinag
Published: December 2019

In most areas in China, the poor quality of printing and dyeing wastewater discharged from dyeing, papermaking and silk factories have caused a series of environment pollution and health problems. So the optimization of the dyeing wastewater effluent process has become imminent. MBR is a new type of wastewater treatment technology in recent years, MBR can efficiently treatment printing and dyeing wastewater. The paper introduces several basic types of MBR treatment process in terms of the working principle, advantages and current situation of treatment in the dye wastewater applications, including AO-MBR Process, Coagulation Sedimentation-Micro electrolysis-MBR Process, MBR-RO Process, MBR Gravity Drain Process, Submerged Membrane Bioreactor (SMBR) Process and Direct Contact Membrane Distillation Process. Through analysis and summary, the MBR treatment process in dye wastewater should focus on solving the problem of removal of the final product. The effective combination of MBR technology and other chemical and physical treatment processes can provide important guiding significance for the future dye wastewater from the end treatment to the control of source pollution.
Research Progress of CO2 Flux in Saline and Alkali soils in Arid area
Authors: Liu L J , Jiao Y , Yang W Z , Yu J X , Song C N , Yu Y Z , Yang J
Published: December 2019

Study on CO2 flux of saline and alkali soil in arid area is of great significance to greenhouse gas control. At present, the main research contents at home and abroad focus on the ways of CO2 sequestration and migration and transformation in saline-alkali soils in arid areas. The influencing factors of CO2 flux in saline-alkali soil in arid area include soil temperature, humidity, pH, EC and soil physical and chemical properties. Inorganic carbon equilibrium process of CO2(g)—CO2 (aq)—HCO3-(aq)—CaCO3(s) is common in soil, its dynamic process dominates the inorganic carbon exchange at the ground-gas interface. This is of great significance to the study of soil-atmospheric carbon circulation system for exploring the principle and mechanism of greenhouse gas change in order to slow down global warming and strengthen the management and control of greenhouse gases. It contributes to China’s energy conservation and emission reduction planning and international carbon balance negotiations.
Abundance and diversity of pollinators on green roofs are affected by environmental factors
Authors: Wu Tingfeng
Published: December 2019

Bees provide a variety of ecological services for urban ecosystems, while green roofs can also be of high value to bees through providing habitats and foraging sites. In this study, four hypotheses about impacts on abundance and diversity of pollinators were proposed from the roof and the surrounding environment. The evidences revealed that the height of the building affected the diversity of some bee species; increasing proportions of surrounding green space helped to increase abundance of bees and wasps; the colonies of bees were significantly affected by habitat connectivity, a frequent movement of bees and other mobile insects between roofs and ground guaranteed pollination of plants; plentiful plants combination was better than a single species in roof ecosystem services, and native forbs were beneficial for pollinations and foraging of pollinators; using fine substrate on green roofs may have a greater ecological value than common soil.
Effects of high pressure homogenization on the stability of cloudy apple juice
Authors: Zhu Danshi , Kou Chengcheng , Wei Liwei , Xi Pushun , Changxin LV , Cao Xuehui , Liu He
Published: December 2019

The high pressure homogenization (HPH) process is a non-thermal technology that can be used to change the structure of fluid foods. Appropriate HPH treatment is benefit for uniform particle sizes distribution in juice and reducing pulp sedimentation. Cloudy apple juice was used as the experimental material in this study to evaluate the homogeneous pressure and homogeneous times (10-1, 10-2, 20-1, 20-2, 30-1, 30-2, 40-1, 40-2, 50-1, 50-2) on stabilities of juice. The indicators, such as, cloud value, cloudy stability, particle size distribution, ζ-potential and dynamic instability were investigated for juice stability. The results showed that, when homogenization at 20 Mpa for one time, the apple juice showed lower cloud value, higher cloudy stability, more uniform particle sizes, higher ζ-potential and lower dynamic instability. Therefore, the better HPH condition on stability of cloudy apple juice was 20 Mpa homogenizing for one time.
Effects of pretreatment on the quality and stability of blueberry juice
Authors: Cao Xuehui , Zhao Yuting , Wang Zhenni , Zhu Danshi , Lv Changxin
Published: December 2019

Quality and stability in blueberry juice were studied with cold pretreatment and freeze-thaw pretreatment. Samples were pretreated in cold temperature environment and the cloud value of juice was significantly decreased (P<0.05). Meanwhile, the cloud value of juice was significantly increased when the blueberries were processed by freeze-thaw pretreatment (P<0.05). The juice of a*
and L*
value were significantly increased in freeze-thaw pretreatment and significantly decreased in cold pretreatment (P<0.05). The turbidity of the juice which blueberries were processed by cold pretreatment was 680 NTU that it was significantly decreased than other samples (P<0.05). The particle diameter of blueberry juice was decreased by cold pretreatment. A cold pretreatment blueberry to process juice most effectively retained the stability of juice and minimized color change.
Characteristics and release of road runoff pollution under artificial rainfall intensity
Authors: Ni Dong , Zhao Ming , Wang Chao , Shao Shegang
Published: December 2019

The artificial rain was used to carry out the leaching test on the road of S306. The sampling of surface runoff under different rain intensity conditions was carried out. The COD, TSS, petroleum and Ammonia nitrogen (NH3-N) were compared in the range of 16.3mm/h∼108mm/h. According to the data, the TSS of road runoff rainwater has a wide range of concentration (300-550mg/L). This is because the composition of pavement sediments determines the nature of road runoff pollution. The source of road runoff is complex and its pollutant composition is also complicated. However, the main pollution indicators causing runoff pollution are suspended solids (SS) and COD, and test data. The value shows that the lower value is mostly the monitoring value at the end of the rainfall. The reason is that the pollutants on the road surface have been taken away by the initial rainfall runoff in the late rain, so the concentration value is low.
Research on Application of Gradient Analysis to City Green Space Accessibility——Taking garden green space of Taian central city for instance
Authors: Ma Lin , Wang Hongtao , Liu Bing
Published: December 2019

Green space accessibility can be used to measure the potential of green space to provide services to residents. In this study, based on the spatial analysis function of GIS software and combining with the distribution of road network of Taian central city, gradient analysis was firstly introduced to analyse accessibility and its spatial distribution character of garden green space quantitatively. Results showed that whole accessibility of garden green space of Taian central city is good whichever transportation was adopted. Most of the regions could arrive at the nearest garden green space within 5 minutes. Accessibility of the centre area was better than that of the edge, and accessibility of the north area was better than that of the south. To some extent, there is relative between gradient distribution of accessibility and that of area of garden green space.
Research on the identification method of Chinese liquor brewing technology types
Authors: Liu Wenzheng , Li Hongxia , Zhao Mingyu , Zhang Junjie , Zhi Min
Published: December 2019

The brewing technology types of Chinese liquor include: solid method, liquid method and solid-liquid mixture method. Due to the difference of technology and raw materials, the price of three types of liquor is quite different. The outlaw often passes off the liquor brewed by the low-grade liquid brewing method as the liquor brewed by the solid brewing method. In this paper, according to the difference of amino acid content in liquor of different brewing technology types, two methods of preliminary identification of Chinese liquor methods were discussed. One method is the qualitative analysis for the colour reaction of amino acids with ninhydrin reagents, and the other method is the classification and quantitative analysis of amino acids in samples by GC. Seven kinds of liquor purchased from different channels are identified and the results of the two methods are consistent. The results of the experiment will give an instructive suggestion to guide the consumers to identify the adulteration of Chinese liquor.
Effects of different Solanum rootstocks on photosynthetic pigment contents and antioxidant enzyme activities of eggplant seedlings under cadmium stress
Authors: Pan Shaokun , Lu Ronghai , Li Hongyan , Lin Lijin , Tang Youwan
Published: December 2019

In the experiment, Solanum diphyllum, Solanum nigrum, Solanum nigrum humile and Solanum alatum as the rootstocks and eggplant seedlings as the scions, and the effects of different Solanum rootstocks on photosynthetic pigment contents and antioxidant enzyme activities of eggplant seedlings were studied. The results showed that S. nigrum as the rootstock increased the content of chlorophyll a, chlorophyll b and total chlorophyll of eggplant seedlings, and other treatments decreased the value of the above indicators or had no effects on them. All the Solanum rootstocks increased the content of carotenoid. Compared to ungrafted, the content of total chlorophyll and carotenoid of eggplant seedlings with S. nigrum as rootstock were the highest, which increased by 7.91% and 45.71%. Different Solanum rootstocks had different effects on the antioxidant enzyme activities of eggplant seedlings, but in general, Solanum rootstocks increased the antioxidant enzyme activities of eggplant seedlings. In conclusion, S. nigrum as the rootstock increased the antioxidant enzyme activities of eggplant seedlings while increasing its chlorophyll content, which was conducive to the growth of eggplant seedlings.
Co-catalyst MoS2-nanosheets/TiO2 nanotubes for the enhancement of photocatalytic hydrogen production
Authors: Ou Wei , Pan Jiaqi , Liu Yanyan , Wang Panhong , Chen Zhanfen , Li Chaorong
Published: December 2019

The MoS2 nanosheets/TiO2 nanotubes heterojunctions are designed for enhancing photocatalytic hydrogen production. The results of XRD, SEM and TEM imply that the heterojunctions are successfully prepared via electrostatic spinning technology and hydrothermal co-deposition method. Besides, the results of UV and PL display that the MoS2 nanosheets enhance the absorption of visible light, drive the transfer of photo-electro and promote the separation of photo-generated carries. Further, compared with the pure TiO2 nanotubes, the heterojunctions exhibit excellent photocatalytic hydrogen production enhancement of about ∼340.739μmol/g.h, which is about 7 times of pure TiO2 nanotubes.
Application of Compound Flocculant for Oil Sand Mature Fine Tailings Two-Stage Treatment
Authors: Peng Yunyan , Jin Dong
Published: December 2019

The flocculation method had a good effect in treating oil sands tailings, and polyacrylamide (PAM) was commonly used as an effective flocculant. In this paper, poly diallyl dimethyl ammonium chloride (PDADMAC) combined with PAM and several supplementary materials into three compound flocculants were used to treat oil-sand tailings for the first time. The compound flocculants were applied for two-stage treatment to compare their performance with that of PAM. The first stage flocculation results showed that mature fine tailings (MFT) treated by compound flocculants had faster initial settling rate, higher clarity of supernatant and higher solid content of sediment than PAM, especially Flocculant A. The second stage dewatering of the mud layer indicated that the water release ability of sediment treated with compound flocculants was better than that of PAM, the yield stress was more appropriate and the capillary suction time (CST) was shorter. The deposits treated with the same flocculant for the two stages had great strength gain so reclaimation became much easier, which provided a new and efficient flocculation solution for the treatment of oil sands mature fine tailings.
Overview of the rheological models for rocks
Authors: Zhong Tingkun
Published: December 2019

This paper introduces the models of rock rheological element model, including classical models and some new models proposed based on the basic models. The classical models are Maxwell model, Kelvin model, Burgers model, and Xi-yuan model. The improvements in the new models mainly focus on using the nonlinear Newtonian body to replace the linear Newtonian body in viscoplastic body. The establishment method and constitutive equations of the new models are also presented. These new models can represent the properties of the corresponding type of rock and soil, and the feasibility of the models has been verified by experiments and modelling. All these researches provide more models in representing the rock rheology behaviour of soil, which is of vital importance in the study of soil and rock mechanics.
Reason analysis and prevention measures of abnormal O2 concentration in return air corner of super-long mining working face of shallow depth seam
Authors: Liu Biaoyi , Zhang Qingsong
Published: December 2019

Due to the occurrence conditions and mining characteristics of super-long working face in shallow depth seam, In normal mining process of the working face, various factors caused O2 concentration reduced in the return air corner, including the raw coal absorbed a large number of oxygen and even coal oxidation spontaneous combustion consumed oxygen, the increase of working face tendency length, surface subsidence and leakage, air leakage in adjacent goaf, air leakage in the mined-out area behind and nitrogen injection fire prevention technology in goaf. In order to increase the oxygen concentration at renturn air corner, some effect measures were taken, such as optimizing the mine ventilation system, Increasing air leakage resistance in goaf, Changing the state of airflow field at the return air corner and reasonably arranging the position of nitrogen injection outlet in goaf. To create a safe working.
Simulation and Optimization of Polystyrene Free Radical Polymerization Process
Authors: Chen Wangbin , Zhao Pengfei , Wang Xiaorong
Published: December 2019

A model for bulk polymerization of styrene was established by using the POLYMER module of ASPEN PLUS. The effects of the chain initiator (TBP), solvent (ethylbenzene) and the chain transfer agent (DDM) on the yield, number average degree of polymerization(DPN), weight average degree of polymerization(DPW), number average molecular weight(Mn), weight average molecular weight(Mw) and the polydispersity index(PDI) of polystyrene were investigated. Through the analysis, we can first consider the amount of styrene to obtain roughly the parameters of the polystyrene process. As the use of initiator in polymerization has the optimal value, we must strictly control the amount of TBP according to the amount of monomer styrene, and adjust the amount of chain transfer agent to control the product quality accurately.
An Optimal Method for Deepwater Oilfield Development System
Authors: Qiu Weiwei , Xiaoxuan Xu
Published: December 2019

The development of petroleum production systems has become more and more sophisticated due to the complexity of deepwater oilfields. Selection of a field development option in early phase will significantly affect overall project economics, schedule and risk. Important factors that drive the selection of a deepwater field development and production system that including subsea production, floating platform, flowline and riser system and export system are identified in this paper. The screening starts with a fair number of potential alternatives. Invalid or obviously inferior combinations were eliminated and this yields a “long list”. Considering the factors reservoir, fluid characteristic, wells, regions and so on, a “short list” was resulted. Finally, it presents a model for decision-making that takes into account the main goals of a company, through the use of fuzzy mathematics. A case study results suggest that the best alternative is not always the one existing the best economic indicators.
The GCMC simulations of adsorption of ethanol and water in zeolitic imidazolate frameworks
Authors: Liu Xiuying , Yuan Junpeng
Published: December 2019

The adsorption mechanism of ethanol and water in five zeolitic imidazolate frameworks (ZIFs) has been investigated using grand canonical Monte Carlo (GCMC) method. The single adsorption isotherm and the selectivity of mixture adsorption of ethanol and water in ZIFs have been obtained. The results show that, at lower pressures (<10kPa), the adsorption amounts decrease in the order of ZIF-2>-10>-6≈-8≈-4. However, when the pressure is higher than 10kPa, the uptakes order is ZIF-10>-2>-6>-8>-4. And the water uptake decrease with the order of ZIF-10>-2>-4>-6>-8. However, the water uptakes for all the ZIFs is very small. The mixture adsorption of ethanol and water shows that, at a given lower pressure, the selectivity decreases as ZIF-2>-8>-10>-6>-4. However, at a given higher pressure, the selectivity is in the order of ZIF-10>-2≈-6≈8>-4. It can be concluded that ZIF-2 and -10 are suitable for the adsorption and separation of biofuel of ethanol. The total interaction energy distribution of ZIFs with ethanol/water has also been analyzed to interpret the adsorption mechanism of ethanol and water in ZIFs.
Production and marketing scheduling of natural gas based on table-manipulation method and Lingo software
Authors: Gao Jianfeng , Jin Juanhua , Wang Yan
Published: December 2019

How to formulate a reasonable natural gas production and marketing operation scheduling strategy to make natural gas production and sales work effectively is an urgent problem to be solved by China’s oil and gas enterprises. Taking a gas company as an example, this paper used linear programming to establish the corresponding mathematical model. Firstly, the problem of imbalance between production and sales is transformed into a balance problem, and then solved by using the table-manipulation method. The Vogel method is chosen to identify the initial basic feasible solution, and then the potential method is used to judge the optimal solution. In the end, the lowest operating cost solution for multiple gas sources is obtained. In addition, the example is solved by Lingo software in this paper, which provides a new method and new ideas for natural gas scheduling management.
Effects of different buckle shed time on catalase activity and malondialdehyde content in grape leaves
Authors: Hu Rongping , Fan Zhonghan , Chen Song , Huang Yan , Lv Xiulan
Published: December 2019

The effects of different buckle shed time on catalase (CAT) activity and malondialdehyde (MDA) content in grape leaves (tender, function and old leaves) were studied involving the following: without buckle shed (CK), buckle shed on January 1st, 2018 (BS I), buckle shed on January 20th, 2018 (BS II), sampled 6 times with interval one week. The result showed that buckle shed increased the CAT activity of grape tender and function leaves, the grape tender leaves of BS I and BS II at the sampling date 4 had the highest and increased by 32.36% and 39.14% respectively, but the grape function leaves of BS I and BS II at the sampling date 2 had the highest and increased by 25.46% and 26.53% respectively. The buckle shed had no significant effect on CAT activity of grape old leaves in early sampled date. The different buckle shed time had no significant effect on CAT activity of grape leaves. Buckle shed increased the MDA content in grape tender leaves, the grape tender leaves of BS I and BS II at the sampling date 4 had the highest and increased by 204.0% and 202.7% respectively. Buckle shed decreased the MDA content in grape function leaves, the grape function leaves of BS I and BS II at the sampling date 2 had the lowest and increased by 46.39% and 48.19% respectively. The MDA content of grape old leaves in the early sampled was decreased compared with control, but in the later sampled increased.
Effects of different time of buckle shed on superoxide dismutase and peroxidase activities of grape leaves
Authors: Hu Rongping , Chen Song , Fan Zhonghan , Huang Yan , Lv Xiulan
Published: December 2019

The effects of buckled shed of different time on the superoxide dismutase (SOD) and peroxidase (POD) activities of grape leaves (tender, function and old leaves) were studied by without buckle shed (CK), buckled shed on January 1st, 2018 (I) and buckled shed on January 20th, 2018 (II), sampled 6 times with interval one week. The results showed that the SOD and POD activities of grape tender leaves and functional leaves under buckled shed on January 1st and buckled shed on January 20th treatments were increased to varying degrees. However, the activities of SOD and POD of grape old leaves under buckled shed on January 1st and buckled shed on January 20th treatments increased in the early stage and decreased in the later stage. The SOD activities of old leaves sampled for the sixth time were higher 17.17% and 12.00% than those of the two treatments, respectively. The POD activity in old leaves in the sixth sampling of treatment buckled shed on January 1st decreased 11.00%. The results showed that the activities of SOD and POD in tender leaves, functional leaves and early old leaves of grapes were increased by the treatment of buckled shed, which indicated that the treatment of buckled shed could promote the growth of grapes and enhance resistance, and there was no significant difference between the buckled shed on January 1st and buckled shed on January 20th treatments.
Design of Intelligent Comprehensive Security System for Existing Office Building
Authors: Yin Chunliang , Du Liandong
Published: December 2019

This project is an overall renovation of the existing government administrative office buildings. In order to realize the overall management of office and security, the owner requires that the security monitoring center and the intelligent management center should be placed in one center, and there should be related interfaces. In addition, cooperation between different brands is often encountered in the project operation, and a set of intelligent weak current systems need to be built, which leads to the integration and integration of management platforms becoming a difficult problem. The owner hopes to obtain a very smooth resource interaction environment. Each access subsystem is regarded as the management module of the platform. Only by realizing the unified management of the platform, the coordinated operation of each access subsystem and the organic combination of the whole system can the real expectations of the owner be met.
Research on base isolation design of nuclear island plant of a new-type metal-cooled fast reactor
Authors: Liu Guo , Fan Yibo , Bai Yanqiang , Xiaohai Qi
Published: December 2019

This paper establishes a 3D finite element model of a new-type metal-cooled fast reactor (MCFR) nuclear island plant for applied research of base isolation technology, and the research includes the base isolation scheme for the split base layer structure, the selection from different types of isolation bearings, etc. According to the mechanical characteristics of different isolation bearings and rigidity distribution of the structure itself, the layout of isolation bearing scheme is carried out. Dynamic analysis of nuclear plan has been done based on ANSYS, and the optimal isolation scheme is determined by repeated trial calculation, isolation design schemes adjustment, acceleration and displacement of key nodes comparison. The results show that: applying base isolation design to the nuclear island plant, natural vibration period of the structure increases, acceleration response of the key nodes of the superstructure and displacement between the layers of the structure significantly decreases, seismic resistance of the nuclear island plant is improved significantly; isolation effect of the scheme with multiple types of isolation bearings is much better than that of the scheme with only rubber bearings.
Construction of Ag spherical micro/nanostructures as SERS-active substrates
Authors: Huayu Zhou , Jingjing Wang , Qing Chen , Xiangna Zhang , Chaorong Li
Published: December 2019

The silver spherical micro/nanostructures were fabricated by the electrochemical deposition technique. Many silver nanosheets build the spherical microstructures. Confirmed by XRD, UV-VIS and SEM characterization measures, the Ag spherical micro/nanostructures were synthesized on the ITO conductive substrates. Furthermore, different current densities were selected to investigate the growth of Ag microspheres. As the gaps between the nanosheets formatted the “hot spots”, which can effectively enhance the Raman signal, we chose the R6G molecule as the probe molecule to evaluate the SERS performance. The experiment results prove that the Ag spherical micro/nanostructures obtained by the simple electrochemical techniques can be used as high-performance SERS-active substrates.
Rock burst risk prediction method based on multi-factor pattern recognition and its application in coal mine
Authors: Zhao Weiguo , Lan Tianwei , Wang Jiren , Sun Jiuzheng , Qiang Li
Published: December 2019

Rockburst is one of the typical dynamic disasters in coal mine, and risk prediction of rockburst is the primary task of implementing comprehensive prevention and control measures. In order to predict the risk of rockburst in different areas of No. 9 coal seam in Jixian coal mine, the geo-dynamic division method is adopted to determine the characteristics of fault developments and mine field structures. Geological structure model is established and the influencing factors of rockburst such as fracture structure, roof lithology, stress and mining depth are analyzed in this paper. On these basics, the multi-factor pattern recognition method for predicting rockburst risk is put forward, and the risk of rockburst in Jixian coal mine is divided into four grades. The prediction results of the comprehensive index method for the 4th panel in second mining area are compared with the prediction outcomes of the multi-factor pattern recognition method. Results show that the multi-factor pattern recognition method have good performance in predicting the rockburst risk, thus providing theoretical and technical support for the management of rockburst.
Research on the Stable Region Division of Urban Underground Space Development
Authors: Ziguang Zhang , Jianli Li , Guangyong Cao
Published: December 2019

Based on giving full play to the self-stabilization ability of surrounding rock, this paper puts forward the concept, ideas and research methods of stable region division of urban underground space development. Then, the stable region division is systematically studied in the single stratum and the composite strata of upper soil and lower rock under different thickness of overlying soft soil stratum and different excavation span. It is pointed out that the larger the thickness of soft soil stratum is, the larger the excavation span is, the greater the boundary depth between the difficult stable region (DSR) and the easy stable region (ESR). Finally, combining with the characteristics of topographic and geomorphological and the statistical analysis of stratum thickness and its physical and mechanical parameters, the spatial distribution map of difficult and easy stable region of underground engineering along Qingdao metro is drawn. The research results provide theoretical basis and scientific basis for rational planning and design of urban underground space development and utilization.
Method of Evaluation for the Construction Geology of Transmission Line Based on Gray System Theory
Authors: Shen Xiangliang , Ren Yu , Chai Linjie , Wang Lihuan , Zhang Deguang , Gao Fan
Published: December 2019

A good engineering geological environment is the premise of engineering construction safety and security. The construction of transmission lines needs to take topography, stratigraphic lithology, engineering geological hazard, structural geology into consideration, but the survey personnel always judge the engineering geological environment roughly only based on individual subjective experience, personal professional level when selecting the transmission line route. We call this judgment process has a gray feature in the point of gray system, while the gray scale can be reduced by the calculation based on gray system, each factor play their role in the evaluation process in their respective weight, so the quantitative, clear results can be obtained. This paper constructs the index system of engineering geological factors of transmission line, using gray evaluation system, and with the help of AHP, the quantitative evaluation results are obtained, and provide a theoretical basis for geological environment evaluation of transmission line engineering. Finally, the geological evaluation is carried out by a real construction and realized the transformation of theory to tool.
A Power Operation Site Safety Assistant System Based on Convolutional Neural Network
Authors: Zhang Yanjie , Li Hongwei , Liu Yunhou , Wang Yunfei , Pan Zhiyuan , Zheng Xin , Jiang Yawei , Liu Jing , Li Aijing , Jing Hui
Published: December 2019

Field operation safety is the key to the safety production of electric power enterprises. The current safety supervision of on-site work mainly relies on the management regulations. In lack of efficient, reliable and intelligent technical means, the management personnel have to supervise and inspect safety procedure on-site. In order to solve the high cost problem of on-site safety management, an intelligent auxiliary system based on deep learning convolutional neural network is proposed in this paper. The system mainly includes three parts: The portable terminal of operation ticket, AI data recorder and neural network calculation unit. It can realize real-time detection of on-site violations during power grid operation. The deep learning AI method is innovatively introduced into the field of safety supervision of power work site, and it provides a new intelligent way of safety supervision.
Parameter stability region analysis of nonlinear link in primary frequency regulation process based on description function method
Authors: Qi Zheng , Zhang Kunjun , Li Hongyi , Chen Gang , Shi Huabo
Published: December 2019

For the primary frequency regulation process of power system, there are some key nonlinear links in the model. After the optimization and transformation of water turbine governor for suppressing ultra-low frequency oscillatory in southwest power grid, its ability to participate in power grid frequency regulation is weakened. And the amplitude and frequency limit of power grid frequency fluctuation are increased; the number of frequency crossing the deadband limit of primary frequency regulation is increased; and the influence of nonlinear link is prominent. The previous pure linear system analysis methods are difficult to carry out effective analysis. Based on this, the paper proposes to use the description function method to analyze the influence of nonlinear links in the system. The parameter stability regions of nonlinear links in different types of frequency regulation models are determined according to the improved Nyquist criterion. Firstly, the nonlinear transfer function models of primary frequency regulation for different types of hydropower, thermal power, and direct current FC are established. This paper summarizes the structural similarity of nonlinear links of different primary frequency regulation resources, and the steps of analyzing its nonlinear link are put forward, and the corresponding simulation verification is carried out.
Classification and Recognition of Regional Landscape Elements of Highway in Guangdong Province
Authors: Zhao Ming , Pan Shaobing , Shang Xiaodong , Wei Xianwei , Yuan Minmin
Published: December 2019

Highway landscape and its regional elements think that it has the essential characteristics of various cultural phenomena, the functions of reproduction, dissemination and evolution, and the cultural diversity. Like all things in nature, it evolves with the changes of the times and the erosion of the historical river. Aiming at the historical changes of the region along the highway and the important activity space of continuing the local context, this paper studies the expression forms and recognition methods of the regional elements in the landscape by excavating the historical context of the region. The research results of this paper can be used in highway construction to better identify regional landscape elements and inherit historical and cultural factors.
Development and Application of adjustable soft ladder head of transmission lines
Authors: Jun Ma , Yonggang Shi , Gang Dong , Fuxing Gong , Kegang Wei , Xin Su , Yu Ding , Zhu Wang
Published: December 2019

Soft ladder head was mainly used for connecting soft ladder and hangs from a convenient tools for live working on the wire in areas of existing transmission technology. Usually it includes a ladder head rectangular frame. Head on top of the frame is installed in the escape of at least two side-by-side pulleytype hook. Pulley type hook into a curved hook. Bending coupler overlap there is between the pulley. Pulley wheel surface of hook is on the wire. Implementation of sliding go along with the wires. The lower end of the frame is welded with hanging rings connected with the soft ladder. The ladder frame is made of aluminium alloy. The stability of the soft ladder is good, the safety factor is high, and the overhaul personnel work at high altitude becomes relaxed and happy. The soft ladder head of vertical double-split conductor is fixed structure[3-5]. However, the distance between two vertical bundled conductors of domestic transmission lines is not the same distance. This requires the maintenance department to equip with a number of software heads. If you are not familiar with the line situation, you need to bring a number of solutions. This makes it impossible for the original ladder head to realize a set of ladder heads for various purposes. It does not have generality, increases cost and affects work efficiency.
Research on Modeling and Simulation for Power Financial Transactions in Recent Chinese Power Market
Authors: Fan Menghua , Zhao Zheng
Published: December 2019

At present, the pace of power market construction in China is accelerating. The policy system and market rules are constantly improving. The market system combining medium and long-term with spot market has been gradually established. The power market trading volume has reached a certain scale, and the reform dividend is released. As of the end of June 2019, eight provincial spot market pilot projects have fully started the simulation and test run. With the gradual improvement of various physical electricity trading mechanisms, the types of transactions in China’s electricity market will extend from the electricity market, auxiliary services market to futures, options, financial transmission rights and other financial derivatives trading markets. In view of the types of electricity financial transactions that have been carried out in China, simulation models are established in this paper and empirical analysis is conducted, which can provide references for further deepening the construction of China’s electricity market.
Research on the design and mechanical properties of new modular building joints
Authors: Wang Yongrui , Xia Junwu , Xu Bo , Ma Renwei
Published: December 2019

The key link of modular construction is to connect modules into a whole through the modular joints. Study shows that the modular structure from module between joints mostly happens to break, and modules joint will determine the bearing capacity of the whole building. Besides, the highlight and the meaning of the modular construction are to quickly build, and modular joint structure determines the construction speed. So modular joints play a very important part in the modular construction. At present, most of modular joints have some shortcomings. It is difficult to meet the construction installation requirements of modular building. So it has great significance to invent a joint which can achieve the fast construction aim, has reasonable construction method and has enough bearing capacity. A new type of modular joint is proposed in this paper, which meets all kinds of requirements of modular construction. The finite element analysis is used to analyze the stress nephogram and the moment-rotation curve to research its mechanical performance under five conditions. The results show that the new type of joint has a certain bearing capacity in each working condition.
Preparation and Properties of Anti-mud and Viscosity-Reducing polycarboxylate superplasticizer
Authors: Du Kelu , Hou Huanhuan , Liu Zunyu , Li Xianghe , Wen Qingru
Published: December 2019

In this paper, the electropositive amide and phosphoric acid functional groups are introduced on the basis of the synthesis of common polycarboxylate superplasticizer, so as to reduce the sensitivity of the polycarboxylate superplasticizer to clay. In this paper, a small amount of 2-Capped1-Phoshate Easter containing olefin functional group was introduced into the polycarboxylate superplasticizer molecule by free radical reaction, which improved the negative electricity of the polycarboxylate superplasticizer and reduced sensitivity to clay. The performance test results show that the product can effectively reduce the sensitivity to clay during the process of mixing concrete with sandstone material with high mudstone content, and improve the fluidity of concrete and effectively reduce the viscosity of concrete.
Analysis of Boron on microstructure and composition of IC10 superalloy
Authors: Qi li , Xiong Ming , Liu FengMei , Yue Xiong , Yaoyong Yi
Published: December 2019

The microstructure and composition of IC10 superalloy containing B (0 wt% 1.1 wt%) were studied in this paper. DSC and microstructure analysis were used to compare the formation process of the microstructure and composition of the IC10 alloy with or without boron content. Precipitation temperatures and sequence of initial phases of IC10 alloys with or without B content were researched. The results shows that the exothermal peaks of formation for γ, MC carbide, (γ+γ’) eutectic and secondary γ’ phase reveal on DSC cooling curves. The alloys with 1.1% B have amephase component and the formation sequence of six phasesis γ, MC, (γ+γ’) eutectic, secondary γ’, M3B2 and Ni5Hf in turn. The boron content enhances the volume fraction of M3B2 and (γ+γ’) eutectic, decreases the temperature of liquids and solidus and also delays the formation of MC and (γ+γ’) eutectic obviously.
Effect of cornstalk ash on the microstructure of cement-based material under sulfate attack
Authors: Li Qinfei , Zhao Yao , Chen Heng , Hou Pengkun , Cheng Xin
Published: December 2019

Cornstalk ash is one of the most abundant, renewable and green supplementary cementitious materials, which is an effective approach to decrease the amount of cement in concrete structures for reducing CO2 emission. In this paper, the influence of mechanical properties and microstructure of the mortar with different proportion of corn stalk ash under sulfate attack are investigated, and it can provide necessary theoretical basis and practical guiding significance for practical engineering. A series of measurements are used to characterize the effect of the corn straw ash of cement hydration products, such as XRD, hydration heat and SEM. It is concluded that corn stalk ash can partly replace cement without reducing the compressive strength and enhance the compressive strength under sulfate attack, the data of TG shows that the content of the calcium dioxide is obviously decreased with corn straw ash.
The transparent Schottky junction of reduced graphene oxide/SnO2 nanoarrays towards enhanced broadband photoresponse
Authors: Li Shi , Pan Jiaqi , Yu Qi , Wang Peipei , Chaorong Li
Published: December 2019

The rGO/SnO2 nanoarrays (rGO/SnO2 NAs) Schottky junction is synthesized by a series of RF magnetron sputtering, hydrothermal and electrochemical deposition. The unique transparent junction exhibits the broadband photoelectric responses from the ultraviolet to visible light. As shown, the proper rGO/SnO2 NAs display highly transparency of about ~60% and dramatically enhance photoelectric conversion of about ∼100 times than that of the initial Schottky junction. Finally, the mechanism of the Schottky junction is investigated.
Two dimensional Z-scheme AgCl/Ag/MnTiO3 nano-heterojunctions for photocatalytic degradation performance enhancement
Authors: Liu Yanyan , Pan Jiaqi , Ou Wei , Wang Panhong , Chen Zhanfen , Chaorong Li
Published: December 2019

The AgCl/Ag/MnTiO3 heterojunction was synthesized by two steps, the MnTiO3 nanowires were first prepared by electrospinning, and then Ag/AgCl was loaded onto MnTiO3 by photodeposition. It can be seen that the AgCl/Ag/MnTiO3 heterojunction is successfully synthesized and proved by XPS and SEM. The absorption band of the AgCl/Ag/MnTiO3 heterojunction exhibits a red shift indicating an increase absorption in sunlight. Compared with pure MnTiO3, the AgCl/Ag/MnTiO3 heterojunction exhibits a better photocatalytic degradation rate of about 8 times, which is attributed to the AgCl/Ag could accelerate the transfer of photogenerated electrons and promote separation of electron-holes efficiently.