bluuebunny/crossref_metadata_2025 huggingface dataset:
Mechanical Reliability Analysis and Optimization Design Method Based on Evidence Theory
Authors: Yang Xiaoxing
Published: June 2020

The analysis and design of mechanical structures and systems has a long and in-depth research history, and has achieved fruitful results. In fact, in the traditional analysis and design of mechanical structures and systems, people have found that there are a lot of uncertainties in the disciplines of system science, transportation science, and management science. It is difficult for traditional deterministic design methods to effectively deal with this type of problems. Uncertainty issues, such as the uncertainty of the shape and size of the structure due to the influence of processing technology, processing equipment, environmental factors and human factors in the manufacturing process, these inaccurate and uncertain information mainly come from the processing technology, Processing equipment, environmental factors, and man-made factors, and evidence theory can effectively model the problem of cognitive uncertainty in engineering, using probability intervals composed of credibility and likelihood to describe the cognitive uncertainty brought about by Impact. This article introduces the basic concepts of evidence theory and the basic process of reliability analysis of conventional evidence theory, and optimizes it to a certain extent. Then, this paper uses the optimization method and conventional methods of this paper to deal with a practical engineering problem, and compares the results. The final research results show that the optimization method in this paper is more effective than conventional methods, and it is concluded that the theory of evidence is indeed applicable to mechanical engineering, and it can effectively analyze the reliability of machinery.
Design and Implementation of Logistics Management System Based on SSH Technology
Authors: Cui Xiaoning , Xie Chao
Published: June 2020

Economic globalization and the rise of e-commerce make the scale of modern logistics company’s cargo transportation more and more large. In this context, the service quality of logistics enterprises often depends on the future of logistics enterprises. Through the establishment of a scientific logistics management system, comprehensive integration of logistics management information, optimization of its process, and ultimately achieve the purpose of improving the efficiency of logistics management business, reducing operating costs, and enhancing the competitiveness of enterprises.
Career development of College English Teachers in the Era of Big Data
Authors: Zhu Xuemei
Published: June 2020

The deep embedding of big data in education is reshaping the ideology and daily practice of teaching and learning, which requires and promotes the college English teachers’ development from “experience-based” to “data driven”. In order to clarify the career development of college English teachers, this paper, using the methods of literature analysis and logical analysis, examines the challenges to college English teachers and puts forward four approaches for their career development in the ear of big data. Of all these approaches proposed, establishing online cooperation alliances and promoting data literacy deserve more attention, because the analysis and utilization of learning data are two important dimensions in the data-driven teaching. College English teachers should be committed to trying new ways and improving their abilities so as to meet the challenges of the big data era.
Paths for Improving Employment Competitiveness of Students with Financial Difficulties at China’s Border Higher Institutions
Authors: Lu Yun , Li Jie
Published: June 2020

Students with financial difficulties in border higher institutions are a special group of students who come from economically difficult areas and families. Because of information occlusion, low school visibility, and solidified employment concepts, their employment competitiveness has many deficiencies compared with their peers. Students with financial difficulties in border higher institutions generally have problems such as poor comprehensive quality, weak ability to resist employment setbacks, and low professional maturity. The border higher institutions should establish complete electronic information archives for students with financial difficulties, build a social support system for students with financial difficulties, strengthen education on employment setbacks students with financial difficulties, and improve their employment competitiveness.
Effect of Pigai.org on English Majors’ Writing Self-efficacy and Writing Performance
Authors: Li Zhang , Yan Dou
Published: June 2020

With the deepening of college English teaching reform, modern educational technology and network teaching platform are gradually applied to college English teaching. As to the English writing, using the automatic scoring system to automatically evaluate the students’ composition has become a new trend. Pigai.org, as one of the many automatic scoring systems in China, has received great attention at home and abroad due to its advantages of timely feedback, high working efficiency and wide application. The thesis conducted a three-month English writing experiment to study the effect of Pigai.org. This experiment used 39 sophomores of English major as the research subject and adopted English writing self-efficacy questionnaires, English writing tests and interview as the research methods to further discusses the influence of Pigai.org on writing self-efficacy and writing achievement of the subjects, so as to effectively play the role of the Pigai.org in the teaching of English writing. The results of this research were as follows: firstly, the English writing self-efficacy and the English writing achievement of the subjects were improved after using Pigai.org by and large. Secondly, using Pigai.org had different influence on the self-efficacy and the writing achievement of students in different levels. The experimental results showed that the effect of Pigai.org on low-level students was more significant than that of high-level students.
BIM Impact Assessment of Landscape Architecture Design
Authors: Meng Yanyu , Wu Nan , Li Yelin , Zhu Chongyang , Kong Lingming
Published: June 2020

In order to determine the influence degree of building information model (BIM) on the stage of landscape architecture design, firstly, this paper analyzes the influencing factors of the application of BIM in landscape architecture design based on the theory of balanced score card (BSC), and then establishes the hierarchical evaluation model of BIM influence degree by using analytic hierarchy process (AHP). Finally, realizes the quantitative evaluation of BIM influence degree. The research results show that based on the level evaluation model of BIM influence degree, the transformation from qualitative analysis to quantitative evaluation of BIM application in landscape architecture design stage is realized, which proves the feasibility and practicability of BIM application in landscape architecture design stage.
An increase in global trends of tropical cyclone translation speed since 1982 and its physical causes
Authors: Kim Sung-Hun , Moon Il-Ju , Chu Pao-Shin
Published: June 2020

In this study, the causes of the increase in global mean tropical cyclone translation speed (TCTS) in the post-satellite era were investigated. Analysis reveals that the global-mean TCTS increased by 0.31 km h−1 per decade over the last 36 years, but the steering flow controlling the local TCTS decreased by −0.24 km h−1 per decade in the major tropical cyclone (TC) passage regions. These values correspond to a change of 5.9% and −5.6% during the analysis period for the mean TCTS and steering flow, respectively. The inconsistency between these two related variables (TCTS and steering flows) is caused by relative TC frequency changes according to basin and latitude. The TCTS is closely related to the latitude of the TC position, which shows a significant difference in mean TCTS between basins. That is, the increased global-mean TCTS is mainly attributed to the following: (1) an increase (4.5% per decade) in the relative proportion of the North Atlantic TCs in terms of global TC’s position points (this region has the fastest mean TCTS among all basins); and (2) the poleward shift of TC activities. These two effects account for 76.8% and 25.8% of the observed global-mean TCTS trend, respectively, and thus overwhelm those of the slowing steering flow related to the weakening of large-scale tropical circulation, which leads to a global mean increase in TCTS. Given that TC activity in the North Atlantic is closely related to the Atlantic Multi-decadal Oscillation and a poleward shift of TC exposure is likely induced by global warming, the recent increase in the global-mean TCTS is a joint outcome of both natural variations and anthrophonic effects.
Distribution sustainability and climate actions in Myanmar
Authors: Linn Kyaw Myo
Published: June 2020

Myanmar as one of the most vulnerable country like among other countries in the world face adverse impacts of climate change like monsoon season changes, temperature rising, sea level rise, storms, floods and the other onset events throughout some decades. Urbanization and population growth call for economic growth and environmental degradation. Sustainability is the matter most for the country to align with environmental integrity and climate change impacts. Policy development, technology transfer, finance allocation and capacity building are essentially needed to combat climate change impacts, to obtain environmental integrity and to meet the goals of sustainability. Climate change Policy and Environmental Policy are being developed within last five years and legislated in 2018 overarching on the sectors of building, transport, industries, renewable and efficient energy, forestry, agriculture, and disaster risk management to mainstream the climate change impacts. Multilateral cooperation and coordination for climate actions are gradually established in Myanmar collaborating with other countries such as Japan and international organizations, INGOs and NGOs. Mitigation measures are carried out in the areas of energy efficiency (CDM and JCM projects) and renewable energy (CDM projects). Adaptation measures are initializing in some urban and coastal areas to adapt and be resilient of climate change adverse impacts at project level. However, cost-benefit analysis to implement the climate actions and raising ambitions at national level to meet the global climate target to limit the 1.5-degree Celsius temperature raising are still needed to compromise for sustainability and environmental integrity while social wellbeing should not be left behind other than the cases.
Approach to assessment of heavy metals contamination in drinking water, Mandalay region, Myanmar
Authors: Maw Aye Min , Phyu Khin Phyu , Aung Myo Nanda , Mar Khaing Khaing , Khin Saw Ohnmar , Khaing Kyawt Kyawt , Thura Aung , THU Aung , Zin Phyo Wai , Thin Khin Maung , Thant Kyaw Zin
Published: June 2020

People use their drinking water sources from surface water or ground water. Contaminants including heavy metals have found their way into water supplies due to inadequate treatment and disposal of waste and industrial discharges. The present study aimed to assess the water quality parameters including heavy metals in drinking water from 120 tube wells in 6 townships (Aung-Myay-Tharzan, Chan-Aye-Tharzan, Chan-Mya-Tharzi, Mahar-Aung-Myay, Pyigyi-Tagon and Amarapura) of Mandalay region, Myanmar. Lovibond Water Testing (Photometer SpectroDirect) was used for testing turbidity, total hardness, chloride, cyanide and nitrite. Acidity (pH), electrical conductivity and total dissolved solids were tested by Pocket Pro™ Tester. Arsenic, calcium, copper, iron, magnesium, manganese, mercury, lead and zinc were analyzed by Atomic Absorption Spectrophotometer. Turbidity and pH in 5 out of 6 townships, total dissolved solids in 4 townships and electrical conductivity in 3 townships were higher than MPL in some samples but the other remaining parameters were complied with WHO limit. The levels of iron in all townships, manganese in 3 townships, arsenic and lead in 1 township respectively were detected in some samples more than the maximum permissible limit (MPL) of WHO and other metals were within MPL. Therefore, the quality of drinking water should be assessed constantly.
Assessment and treatment of arsenic contaminated tube well water from selected areas in Kyaunggon Township, Ayeyarwady Region, Myanmar
Authors: Phyu Khin Phyu , Win Kyi Kyi Nyein , Hlaing Moh Moh , Zaw Khine Mar , Han Tin Tin , Marlar Mya , Aung Myo Nanda , Zin Phyo Wai , Naing Aye , Konishi Arisa , Morita Yasuhiko , Htun Zaw Than
Published: June 2020

Arsenic contamination of tube well water has become the greatest health threat to the people. This cross-sectional analytic study aimed to find out the prevalence of arsenic contaminated wells in selected areas of Kyaunggon Township, to increase the arsenic awareness and to construct the low-cost arsenic reducing Gravel Sand Filter (GSF) for household use. The water samples were tested for arsenic and other parameters. About 66% (63/96) tube wells of depth between 12 to 183 meters had arsenic concentration more than 10 ppb and moreover 42 out of 63 tube wells had depth between 30 to 90 meters. Therefore, this depth range should be avoided for tube well construction in that area. About 67.7 % (65/96) had iron concentration more than 0.3 ppm, 74 % (71/96) had manganese concentration more than 0.4 ppm and 4.1 % (4/96) had phosphate concentration more than 4 ppm according to WHO drinking water quality guideline. These results were disseminated to basic health staff, teachers and students from respective areas. GSF was constructed and demonstrated to villagers. Widely using of this removal method in arsenic contaminated areas will partly contribute towards the safe water supply and promote the community health.
Blood lead level, cognitive and psychomotor activity in lead exposed battery workers
Authors: Shwe Thazin , Win-Thu Muyar , Mar Ohn
Published: June 2020

Lead, a systemic toxicant affecting virtually every organ system, primarily affects the central nervous system. The aim of the present study was to determine and compare blood lead level, cognitive and psychomotor ability level in the non-exposed subjects and lead-exposed battery workers and to find out the relationship between these parameters in the lead-exposed battery workers. This cross-sectional study included 28 non-exposed subjects and 28 lead-exposed battery workers from small-scale battery workplaces in Insein and North Okkalapa Townships. The blood lead level (BLL) was determined by graphite furnace atomic absorption spectrometry. The cognitive ability was assessed by using three subtests from the General Memory Scale (GMS). The psychomotor ability tests composed of digit symbol, Bourdon-Wiersma vigilance test and the Santa Ana dexterity test. The mean BLL of the lead-exposed battery workers (4.25±3.87 μg/dL) was significantly higher (P<0.01) than that of the non-exposed subjects (2.14±1.02 μg/dL). After matching age, sex, socio-economic status and educational level, it was found that mean scores of cognitive and psychomotor ability tests (digit span, paired associate learning and Santa Ana dexterity) of the lead-exposed battery workers were significantly lower than those of the non-exposed subjects. It was concluded that even low lead exposure could reduce the cognitive and psychomotor abilities, especially in attention, concentration, short-term memory and perceptual motor ability domains in adult male workers.
Assessment of surface water quality along Pazundaung Creek, Yangon City
Authors: Aung Hein Htet , Ye Myint Theingi , Khaing Nway Nway
Published: June 2020

This study focuses on the assessment of water quality at seven sampling points along the Pazundaung Creek in Yangon. Moreover, the determination of BOD, COD, DO, TH, EC, Cu, Cl, TDS, pH, turbidity and temperature were carried out. Water samples had been collected in February, March, April and May. According to the findings of this study, the water quality of Pazundaung Creek was deteriorated due to the rapid urbanization and industrialization along this creek. Therefore, the sources of these types of wastewater should be carefully controlled by applying the effective waste management systems and appropriate wastewater treatment technologies to prevent the water pollution of this creek. All of the results from sampling analyse were compared with Malaysia Water Quality Standard of class IIA and class IIB. According to the standard limitations of Malaysia Water Quality Standard, this type of surface water needed a conventional treatment process to use as water supply. In the case of fishery, the sensitive aquatic species can survival in these limitations and can also be used for recreational use with body contact.
Profiling Fecal Pollution in Rivers in Hanoi, Vietnam, using Host-specific Bacteroidales and crAssphage Markers
Authors: Pham Minh Ngoc , Kasuga Ikuro
Published: June 2020

Microbial source tracking (MST) based on host-specific fecal microorganisms is a powerful tool for identifying sources of fecal contamination. In Vietnam, fecal contamination caused by untreated domestic wastewater as well as wastewater from the livestock sector is a major issue for the water environment. In this study, samples from different rivers in Hanoi, Vietnam, were analyzed using quantitative PCR analysis for Bacteroidales markers specific to human (HF183), pig (Pig2Bac), and ruminant (BacR) feces and a bacteriophage marker specific to human feces (crAssphage). Water samples were collected from Nhue River, To Lich River, Kim Nguu River, Day River, Duong River, and Red River during August, September, and December 2019. Groundwater samples from areas near the Nhue River and Day River were also collected. Regarding the To Lich River and Kim Nguu River, only human-specific markers (HF183 and crAssphage) were detected, indicating that the primary source of fecal contamination of these rivers was human feces. In the Nhue River, pig- and ruminant-specific markers were detected, in addition to human-specific markers. Pollution from multiple fecal sources was therefore suspected in the Nhue River. In the Day River, the concentration of pig-and ruminant-specific markers was generally higher than that of human-specific markers. Since the concentration of HF183 and crAssphage in the Day River was lower than those in the other rivers, the contribution of animal feces could be relatively higher in the Day River. The concentration of fecal markers in the Duong River and Red River was much lower than that in the other rivers. MST was successfully applied to characterize sources of fecal pollution in different rivers in Hanoi. The profiling of fecal sources is informative when considering water quality remediation in rivers.
Scheduling of electric-thermal integrated energy system considering environmental cost
Authors: Xingchen Yao , Fei Xu , Lei Chen , Ling Hao , Tuo Jiang , Te Cheng , Yong Min , Qun Chen
Published: June 2020

Coordinated scheduling of electric heating comprehensive energy system is an effective measure to promote wind power consumption and solve environmental problems fundamentally. In the existing coordinated scheduling of electric heating, the optimization goal usually only considers the minimum of abandoned wind or the minimum of overall coal consumption of the system, and does not directly take pollutant emission as the optimization index. In the actual operation, the target of minimum total coal consumption or light rejection rate of abandoned air is likely to be inconsistent with the target of minimum pollutant emission. Therefore, this paper proposes a coordinated scheduling model of electric heating comprehensive energy system considering environmental cost, selects the appropriate expression form of environmental cost, unifies the economic cost and environmental cost, and takes its weighted sum value as the optimization goal, so as to achieve the lowest comprehensive economic cost and environmental cost on the basis of maximizing the consumption of wind power. Finally, the comparison between the traditional optimization model and the model proposed in this paper is carried out by the way of example simulation. The results show that the new optimization model is helpful to reduce the environmental expenditure, and the cost of considering the environmental cost is 5.2% lower than not considering the environmental cost.
Energy Saving and Emission Reduction of Study on Lightening of Dump Truck Carriage
Authors: Wang Lanhua , Di Chaoqun , Liu Qi , Song Li , Jiao Fengqin
Published: June 2020

Through the finite element modeling of dump truck’s Carriage, the stiffness and strength performance of dump truck’s carriage under static and dynamic conditions were evaluated. At the same time, without changing the original car of the dump truck, the material and plate thickness of the car parts were used as its design variables. The static and dynamic working conditions of the dump truck were optimized by the application of finite element analysis and approximate model technology. When the design performance of the dump truck can fully meet the requirements, energy saving and emission reduction can be achieved. The plates of dump truck are replaced by Baohua wear-resisting Steel Plate BHNM400/450 and TISCO high-strength plate T700 according to the principle of equal strength replacement, which canprovide the reference for enterprises. Through the application of new materials, the self-weight of dump truck can be reduced, and the quality of dump truck can meet the requirements of industry regulations.
Comparison of Heat Transfer Performance for Condensation in Corrugated Low Finned Tube and Smooth Tube with Air
Authors: Ren Bin , Pu Zhe , Tang Xiaoying , He Aini , Lu Hongliang , Si Sun
Published: June 2020

The existence of air served as non-condensable gas makes it difficult to design effective titanium condenser in PTA plant. In this paper, the heat transfer characteristic for condensation inside corrugated low finned tube and smooth tube in presence of air was compared. The local heat transfer performance was studied by comparing bulk temperature and local heat transfer rate. The effect of non-condensable gas mass fraction on overall heat transfer performance was also analysed. The results indicated that both the bulk temperature and the local heat transfer rate decreased along the axial direction due to the reduction of steam partial pressure and temperature difference. The average heat transfer coefficient and total heat transfer rate decreased with the increase of inlet non-condensable gas mass fraction. And the corrugated low finned tube could reduce the impact of non-condensable gas by reducing the thickness of gas film and condensate film.
Research Progress on Experimental Optimization for Heat Performance of Pulsating Heat Pipe
Authors: Du Zhehua , Lin Xin
Published: June 2020

Pulsating heat pipe is regarded as a promising cooling technique for electronic devices. Investigations on thermal performance optimization for pulsating heat pipe will provide guide-line for the utilization of pulsating heat pipe. In this paper, thermal performance optimization for pulsating heat pipe via experimental investigations is introduced.Three optimization approaches are analyzed, including the improvement of structure, the utilization of working medium, and the treatment of internal surface. The mechanism of heat transfer enhancement of pulsating heat pipe is discussed, and the potential research field of thermal performance optimization for pulsating heat pipe is predicted. On the basis of familiarity with multiple pulsating heat pipe optimization strategy, it is necessary to explore coexistence mechanism of multiple optimizing strategy and develop pulsating heat pipe coupling enhanced heat transfer method.
A review of energy storage and its utilization in Integrated Energy Systems
Authors: Ji Wenjia , Zhang Han , Ding Fei , Wang Jiale , Zhang Rui , Guo Su
Published: June 2020

Energy storage system is the central facility in the Integrated Energy System. It plays a significant role in the stable operation of the system and the distribution of the renewable energy sources. This thesis is based on the overall consideration of diverse systems and make a review of the different working conditions, classification, constraint conditions, operational modes and so on in the energy storage system.
Entropy generation analysis of premixed hydrogen-air combustion in a micro combustor with different mass-flow velocity
Authors: Wu Yifeng , Yang Wenming , Yang Meng , Shan Jingwei
Published: June 2020

In order to improve the flame stability in the micro combustor with a backward-facing step, porous media is being used in the combustion chamber.In this work, lots of analysis of entropy generation rate caused by chemical reaction, heat conduction and mass diffusion had been carried out. The effects of mass-flow velocity are numerically investigated via the analysis of entropy generation rate. Analysis in this paper reveal that: as the mass-flow velocity m
H2=1.13×10-6kg/s, the micro combustor with porous media obtained the highest mean wall temperature and entropy generation rate 2.11×10−3W/K. It is obviously seen that a higher mass-flow velocity contributes to a higher entropy generation rate and combustion efficiency.
Influence of thermal stratification by fire on heat-mass coupling response mechanism of the liquefied tank
Authors: Ma Yuheng , Shi Shicheng , Wang Supan , Lu Chunyi , Wang Zhirong , Pan Xuhai , Jiang Juncheng
Published: June 2020

In order to study the explosion-inducing process and thermal response of fire-induced BLEVE(boiling liquid expanding vapor explosion), a small experimental device was established. The radiant heating source was used to simulate the external fire heat effect, and superheated water was used as the medium. The pneumatic ball valve was used to simulate the leakage action. The gas-liquid flow, internal pressure and temperature transient response of the tank during the heating and venting processes were measured, and the superheated process of the medium in the tank was analyzed. The temperature-pressure coupling response after the explosion was traced to investigate the thermal action of the fire on the tank. The experiment found that the heating of the storage tank was the generation and gradual disappearance of temperature stratification. The crack action would result in the breaking of phase equilibrium and pressure rebound. There was an overheat delay in the detonation, and the temperature stratification would prolong the overheat time of the medium. There was a lower limit for the occurrence of the BLEVE accident, the critical stratification degree was used to quantify the limit and the limit of this experimental condition was ξ≤2.33.
Mathematical Model of Reliability Evaluation on Air Volume of Ventilation System in Volume Adjustment by Frequency Conversion
Authors: Du Zhehua , Lin Xin
Published: June 2020

The reliability on air volume of ventilation system in volume adjustment by frequency conversion of fan was theoretically studied. Based on the law of large numbers, the probability could be transformed to frequency ratio with fully considering the fluctuation of air volume. Two conversion formulas for transforming air volume under normal working frequency into air volume under required frequency with or without considering natural ventilation pressure were deduced. On this basis, the reliability of air volume under required frequency can be predicted through measuring air volume under normal working frequency, then the unknown reliability can be predicted before volume adjustment by frequency conversion of fan. The reliability matrix and reliability value matrix on air volume of ventilation system were deduced and constructed. The relationship between the matrices and fan frequency was theoretically analyzed, as well as the forecast on reliability matrix and reliability value matrix of the required frequency based on the conversion formulas.
Dynamic changes and sensitivity of water Area of Huixiankarst wetland
Authors: Sun Xiaoshuang , Lu Ming , Ren Zhili
Published: June 2020

Affected by human activities and natural factors, the area of the Huixian karst wetland has been shrinking in recent years. As the main data source, Landsat5 TM remote sensing image was used to analyze the trend of wetland landforms and its driving factors. The changes of various types and the sensitivity of water influencing factors of Huixian wetland in the past 30 years were analyzed by visual interpretation, supervised classification and geographic information system. The analysis results show that the water area of the wetland has decreased significantly in the past 30 years, and the reduction is 4.52 km2.The fish pond area appears an increasing trend, and the increase is 2.81 km2.The increase of farmland and vegetation is 1.66 km2 and 0.33 km2 respectively. The increase of fish ponds is much smaller than the reduction of water bodies.Water bodies have been developed into farmland or vegetation land. The main driving factor of land type change is human activity, and natural driving is secondary.Sensitivity analysis shows that water for agriculture and fish ponds is the most important factor contributing to the shrinkage of natural water bodies in Huixian wetland.
Study on optimal pollutant control screening in benxi section of taizi river
Authors: Guo Qiucen , Song Haowen
Published: June 2020

In view of the pollution problem of toxic and harmful sewage discharge from enterprises in benxi section of the upper reaches of taizi river, the typical pollution sources of benxi section were investigated and the pollutants in benxi section were measured.The comprehensive scoring method based on the potential hazard method was used to select 8 factors suitable for the selection of benxi section of taizi river and assign weights to them.Screen out 13 kinds of poisonous and harmful pollutants for benxi section of the optimal control of pollutants.It provides the index basis for monitoring the water quality of the benxi section of taizi river and water risk accidents.
Study on the optimal operation of urban combineddrainage channel box
Authors: yang Hui , Song Haowen , Chen Yilang , Zhou Wuyang , Sun Zhimin
Published: June 2020

This paper optimizes the operation mode of the combined drainage channel box sluice in H river basin of a city in south China to solve the problem of frequent sluice opening.Based on the InfoWorks ICM software, the hydraulic model of drainage system of the river basin was established, the measured rainfall and liquid level were screened, the model parameters were determined by using the rainfall data of medium and heavy rain, and the model was verified by using the rainfall data of heavy rain. The optimal liquid level is obtained by analyzing and comparing the simulation results. The simulation results are basically consistent with the actual precipitation.After optimization, the optimal liquid level of the combined drainage channel box sluice gate increased by 0.8m compared with the manually operated maximum liquid level. After the operation mode of sluice is optimized, the annual sluice opening times are reduced by 78%. After the experience, the InfoWorks ICM hydraulic model has high reliability, and the optimal sluice opening liquid level can be obtained through simulation analysis, which can more effectively prevent waterlogging and reduce river pollution.
Isothermal Water Mass in the Bottom Water at the Bay Mouth of Jiaozhou Bay?. Isothermal Water Mass scale and location
Authors: Yang Dongfang , Fang Jing , Su Chunhua , Wang Ming , Zhu Sixi
Published: June 2020

Based on the survey data on Jiaozhou Bay in May, June, July, August, September and October 1980, the bottom water temperature and its horizontal distribution in Jiaozhou Bay were studied. The results showed that the author put forward the definition of isothermal water mass and determined the scale and location of the isothermal water mass. According to Yang Dongfang’s definition of “Isothermal Water Mass”, it was revealed that the temperature of isothermal water mass in the inner part of the bay mouth was higher than that in the outer part of the Bay mouth in May, June, July and August. In September and October, the temperature of isothermal water mass in the inner part of the bay mouth was lower than that in the outer part of the Bay mouth. Moreover, the number, location, scale and temperature variation sequence of isothermal water masses were determined by the sea water temperature and its variation trend in both June and October.
Isothermal Water Mass in the Bottom Water at the Bay Mouth of Jiaozhou Bay Isothermal Water Mass Existence
Authors: Yang Dongfang , Lin Dong , Zhang Longlei , Wang Qi , Li Haixia
Published: June 2020

Based on the survey data of Jiaozhou Bay in May, June, July, August, September and October 1980, the bottom water temperature and its horizontal distribution in Jiaozhou Bay were studied. The results show that the bottom water temperature of Jiaozhou Bay ranged between 10.18°C-25.72°C in May, June, July, August, September and October, and the bottom seawater temperature reached above 10.00°C. This indicates that the bottom water temperature of Jiaozhou Bay was relatively high in May, June, July, August, September and October, which showed the number, location, scale and temperature change sequence of isothermal water mass in Jiaozhou Bay in May, June, July, August, September and October were determined.
The Settlement of Pb Content Determined by Sources and Volume
Authors: Yang Dongfang , Lin Dong , Zhang Longlei , Wang Qi , Li Haixia
Published: June 2020

According to the investigation materials in the waters of Jiaozhou Bay in 1991, this paper studies the vertical distribution and seasonal changes of Pb content in the surface and bottom waters of Jiaozhou Bay from the center of bay to the north of bay mouth, and determines the seasonal distribution, range of variations and the trend of horizontal distribution. The results show that in May and August, the Pb content in waters ranges within 4.27-31.66ug/L from the north of bay mouth to the center of the bay, from the surface layer to the bottom, conforming to the 2nd, 3rd and 4th quality standards of sea waters and corresponding to slight, moderate and severe contamination respectively. In May and August, the waters from the north bay mouth to the center of the bay reveal the rule that the Pb content in the surface and bottom layers from May to August showed the changing of low to high. Therefore, the Pb content in the surface and bottom waters from low to high is spring and summer in sequence. In the waters of north of bay mouth and bay center, the Pb content is high in the bottom waters when it in the surface is high; the Pb content is low in the bottom waters when it in the surface is low. In May and August, the horizontal and vertical distribution of Pb content shows the same trend in the waters of north of bay mouth and bay center. Therefore, from May to August, the different supply volume from the same source determines the different seasonal changes of Pb content in the waters of north of bay mouth. In the same period, different supply volume from various sources determine the different seasonal changes of Pb content in the waters of bay center. Thus, in different waters and periods, different sources of water bring different Pb content. And seasonal changes are different as well. Based on the mentioned above, the author gets the conclusion that different sources of Pb content and various volume determine the various seasonal changes in waters. In addition, the results in the waters from north of bay mouth to the center of bay indicate that in the temporal and spacial scale, Pb content quickly and continuously settles to the seabed, resulting in the consistency in the waters between the north of bay mouth and the bay center. The horizontal distribution trends of Pb content are same in the surface and bottom waters in various sources of water and any time. This consistency is because of the gravity effect of Pb content. Human activities discharge Pb to the waters and land, settled to the seabed through water body effect, resulting in all the contamination of Pb content in the ocean.
Analysis on Influencing Factors of Urban Road Traffic Noise and Its Control
Authors: Xitong Zhang , Wenjuan Zhang , Jingyao Ma
Published: June 2020

With the continuous improvement of people’s requirements for a better life, the use of motor vehicles is also gradually increasing, thus road traffic pressure is also gradually increasing. Especially in recent years, urban construction has developed rapidly. Newly built and expanded streets and roads have turned the originally remote and quiet areas into bustling and noisy downtown, thus increasing the impact of traffic noise on the surrounding environment. Obviously, this goes against people’s pursuit of a better life, so the optimization of urban traffic noise is particularly important. This paper analyzes the main factors that affect traffic noise and puts forward corresponding control measures.
Study on the evaluation system of green development in Tuojiang River Basin based on entropy weight method and grey relation analysis
Authors: Zheng Shiyi , Zhang Chunhu , Zhou Ying
Published: June 2020

Based on the definition of green development and the characteristics of the Tuojiang River Basin, nine primary indicators and 17 secondary indicators are selected to establish a green development evaluation system for the Tuojiang River Basin from the four aspects of “economy, society, resource and nature”, and the weights of each indicator are determined by entropy method, with Zigong, Luzhou, Deyang, Neijiang and Ziyang as the research objects. The grey correlation method is used to analyze the 2017 statistical data to evaluate the green development of the Tuojiang River Basin and put forward some suggestions.
Study on “Two Zone” Development Height of Overburden Rock in Fully Mechanized Face with Large Mining Height
Authors: Du Mingze , Kong Fanlong , Wang Donghao
Published: June 2020

In terms of the problems of the development height of the “two zones” of overburden in the fully mechanized mining face was difficult to predict, taking the 31303 working face in Chahasu coal mine as an example, methods of empirical formula, leakage of drilling fluid and borehole colour TV were used for prediction and exploration. On the basis, the concept of empirical formula error was proposed, and the error rate predicted by slicing mining and fully mechanized caving mining in thick seam was analysed. The results showed that the fracture-mining ratio and caving-mining ratio of 31303 working face were 23.67 and 5.6 respectively, that is, the development height of water-conducting fracture zone and caving zone were 106.50 m and 25.20 m respectively. The “two zones” empirical formula of thick seam slicing mining and fully mechanized caving mining deviated greatly from the predicted results of fully mechanized mining face with large mining height. The formula for calculating the error rate of empirical formula was proposed. The error rates of the empirical formulas for layered mining and fully mechanized caving mining were quantitatively analysed, which were 50% and ± 28%, respectively, indicating that the traditional empirical formula was not universal in the prediction of “two zones” of fully mechanized mining with slicing mining.
Experimental and simulation analysis of hexane leak in pump room
Authors: Zhou Chenglong , Chen Tao , Chen Tao , Li Zhipeng , Li Xingfeng
Published: June 2020

The technology of monitoring and tracing the unorganized emissions of VOCs in petrochemical parks is a research hotspot. For the VOCs leakage in the pump room of the aromatics extraction equipment, 6 distributed monitoring points are implemented to monitor the VOCs concentration. A 2-hour leak test is performed using n-hexane standard gas, and the process is simulated using computational fluid dynamics. The results show that there is a background value of n-hexane concentration in the pump room, which means that potential leakage occur. P36, P19, P18, and P15 were able to respond to the n-hexane leak, but the concentrations of P14 and P17 y did not increase. The leakage sequence of simulation is the same as that obtained in the experiment. The concentration distribution is affected by the wall barrier and distance, and n-hexane will preferentially diffuse along the wall.
Environment Construction Analysis and Prevention of Strong Wind-Storm / Blizzard-Freezing Disaster
Authors: Chen Tao , Zheng Huijie , Chang Zhenxing , Ma Na , Wang Guanning
Published: June 2020

The aim of this study is to explore the occurrence conditions of strong wind-storm / blizzard-freezing disasters, analyse the coupling law and interaction mechanism of disaster elements of various types of disasters, and explore the system of coupled disasters in accordance with similar criteria and construct a comprehensive test environment for this meteorological disaster. Based on this, we studied the effects of extreme disasters on various fields. We also wanted to discuss the defense measures in various fields for strong wind-storm / blizzard-freeze disasters to reduce the losses caused by disasters.
Kinetics and thermodynamic studies on sorption of NPs by ECDMZ from aqueous solution
Authors: Xiaohong LI , Xuekui HAO
Published: June 2020

The sorption kinetics of NPs from aqueous solutions by ECDMZ was researched. The experimental results indicated that the sorption of ECDMZ fits the second order dynamic equation. It is showed that the chemical sorption process should be the main factor of controlling sorption rate. Meanwhile, the thermodynamic of NPs from aqueous solutions by ECDMZ were studied too. The thermodynamic research revealed that the whole sorption was exothermic and spontaneous process. In the studied range of 20∼100 mg?L−1, Enthalpy change dominated the whole chemical sorption process. Temperature had little effect on the sorption process in the studied range of 288∼308 K.
Investigation on the Contents of Acrylamide in Baked and Fried foods
Authors: Zeng Shaodong , Chen Wuhai , Ye Jianzhi , Yang Chunliang
Published: June 2020

The current work aims to develop a method for the determination of acrylamide in baked and fried foods using high performance liquid chromatography-mass spectrometry (UPLC-MS/MS). In this study, the extraction of acrylamide was using water and then cleaned up on a HLB and MCX SPE cartridge, followed by separating on a [Waters ACQUITY UPLC BEH C18 (100 mm×2.1 mm, 1.7 μm)] column using acetonitrile and 0.1% formic acid as mobile phase. Thereafter, the concentration of acrylamide was determined in multiple reaction monitoring mode, usingD3-acrylamide as internal standard. It was found that the proposed calibration curve was linear in the range of 0.1 to 100 μg/L with a correlation coefficient greater than 0.99 indicating a very good linearity. The limit of detection (LOD) was 5.0 μg/kg and the quantitative limit (LOQ) was 10.0 μg/kg. The average recovery at three spiked levels (5, 20 and 100 μg/kg) of roasted coffee and deep-fried dough sticks was ranged from 88.0 % to 106 % with RSD smaller than 6%. The method was also tested by analysing acrylamide in baked and fried food samples (biscuits, roasted coffee, cake, fried potato, potato chips and deep-fried dough sticks). The acrylamide concentrations were found between 28 μg/kg and 635 μg/kg in those samples. Taken together, the developed method has superior for determination of acrylamide in baked and fried foods samples, which is of simplicity, high accuracy and good stability.
Research on Social Responsibility of Chinese Food Enterprises
Authors: Zhao Wei wei , Jiang Zhou
Published: June 2020

Health is a matter of concern to everyone, which is an important foundation and premise for individual survival and development. A healthy life guarantees the dignity of life. However, in recent years, major events in food have revealed that people’s health is under threat. In China, coronavirus originated from the seafood market in south China, in which food companies played a key role. Thus, we start thinking about the social responsibility of food enterprises. From the perspective of ISO 26000 international standard on social responsibility, this paper systematically discusses and answers the questions of what is the social responsibility of food enterprises, what obligations enterprises have in food security, and how to construct the social responsibility of food enterprises.
Research on Social Co-governance Innovation Model of Food Safety--Based on CAS theory
Authors: Zhao Jiali , Mu Jing
Published: June 2020

In the information asymmetry environment, food safety is a major focus of social livelihood, because consumers can not get the information of food production and circulation. Based on the CAS theory, this paper establishes a government-enterprise co-creation model of food safety, which takes the government and the food safety behavior of food enterprises as the main body, and it is found that the pertinence of government policies and the exemplary role of leading enterprises are the core of co-creation of food safety.
Reliability of Peanut Oil Authenticity Identification Based on Fatty Acids and Establishment of Adulteration Analysis Model
Authors: Yeqing Li , Xiaodi Pi , Yanna Xu
Published: June 2020

In order to establish a highly reliable, fast and effective method for identification of adulterated peanut oil, this paper studies authenticity identification based on fatty acids. A comparison of the credibility using three different methods was conducted, namely the method of GB/T 1534 Peanut Oil, Principal Component Analysis (PCA) and Partial Least Squares analysis (PLS). Firstly, 120 samples were prepared by mixing peanut oil with corn oil, soybean oil or palm oil in different proportions. Afterwards, adulteration models were developed respectively using Principal Component Analysis (PCA) and Partial Least Squares analysis (PLS). The results show that according to the quality standard, the adulteration could be identified only when there was more than 50% soybean oil, 45% corn oil or 15% palm oil; the reliability was low. Both PCA and PLS models were more credible than the quality standards; furthermore, PLS model was more effective than PCA model, it could not only identify the adulteration by 100% when palm oil, soybean oil or corn oil was solely mixed, but also distinguish well the type of oil adulterated. The results also indicate that when peanut oil adulterated with palm oil, the content of palmitic acid and myristic acid had highly positive correlation; when that mixed with soybean oil, the content of linoleic acid and linolenic acid were highly positively correlated; when that mixed with corn oil, the content of heptachenoic acid was positively correlated, but negatively correlated with the content of behenic acid, arachidonic acid and arachidonic acid.
Comparative Analysis and Enlightenment of Food Safety Supervision System in Advanced Countries
Authors: Wang Wenjie
Published: June 2020

Food safety issues are widespread across the globe, with high levels of public concern and great social harm. In 2019, the Food and Agriculture Organization of the United Nations and the World Health Organization pointed out that approximately 600 million people worldwide are harmed every year by eating unsafe food. Food safety supervision is an important measure to prevent the occurrence of food safety problems. This article uses a qualitative research method to compare the food safety regulatory systems in developed countries and analyze their existing characteristics, to provide experience and lessons for other countries to improve food safety regulatory systems and prevent food safety accidents. At the end of the article, it was concluded that less developed countries should make efforts to improve the supervision mechanism, increase the training of supervisors and update supervision methods.