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Copyright of Petroleum Refinery Engineering is the property of Petroleum Refinery Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

To explore the heavy metal pollution characteristics and risk in Shaanxi typical mining soil and edible forest products, through sample collection in Huazhou District Weinan City, Zhashui County, Fengxian County mining area of soil and edible forestry products and analysis of the As, Hg, Pb, Cd, Cr, Cu content, using single factor pollution index method, Nemero comprehensive pollution index method, soil and agricultural products comprehensive quality index method, heavy metal pollution of soil and edible forest products was evaluated. The results showed that the accumulation levels of As, Hg, Pb, Cd, Cr and Cu occurred in the soil in the study area;different degrees of Cr and Cu accumulation, two samples of Pb content exceeded the standard;the single pollution index indicated that Cd was the main pollutant in the soil of the study area of Feng County, Cr and Cu were the main soil pollutants in Zhashui County;the soil in Fengxian County and Zhashui sampling area was slightly polluted (quality grade Ⅲ), the soil in Huazhou sampling area was still clean state (quality grade Ⅱ). The comprehensive quality effect index indicated that, soil in Fengxian County Presents slight pollution (sub-Ⅱ), Huazhou District presents mild pollution (sub-Ⅲ), Zhashui County was heavily polluted (sub-V). Heavy metal pollution occurs in the soil of Fengxian County, Huazhou county and Zhashui research area, and remediation measures should be taken in time to reduce the pollution of heavy metals in soil and edible forest products. [ABSTRACT FROM AUTHOR]

Reviews the development process of the evaluation of water inrush risk from coal seam floor. Then the system of risk evaluation is put forward: indexes (establishment of index system), methods (selection of evaluation methods) and tools (innovation of handling tools), and the three steps are summarized. The study indicates that the development of index system is no longer the expansion of factor sets, but the treatment of non-linear relationship among factors, as well as the simplification of the two basic factor sets: mining and geological conditions. The existing methods are divided into three categories according to the logic of data processing. Based on the basic information of the data, the first type is to consider, sort, and synthesize three effects of the original data on the evaluated object: size, height, advantages and disadvantages, thus forming the evaluation result. The second type includes assessment, analysis, expansion and extension of the data, then the potential information is discovered to form the final result. The third type is to organize data sets with the same indexes, and find common information among data through related processing technology to obtain the result. The development direction of future evaluation methods covers two aspects. On the one hand, it aims to inherit the water inrush coefficient method and improve its poor performance in thick, extremely thick, and extremely thin water-resisting layers. On the other hand, it aims to innovate new methods of machine learning, then develop and apply them and their combined models. Besides,three goals that the processing tool needs to achieve are proposed:build a three-dimensional model of a mine,the realization of dynamic demonstration,positioning,quantitation and probability.The problems faced by the three parts are discussed and specific solutions are elaborated.On the basis of the above,the research prospect of all links of water inrush risk evoluation system from coal seam is globally clarified.

[Objective] The aims of this study are to reveal the temporal and spatial evolution characteristics of mountain torrent disaster risk and its influencing mechanism on the Loess Plateau over the past 30 years, and to provide a scientific basis for the development of comprehensive prevention and control strategies for mountain torrent disasters on the Loess Plateau. [Methods] Based on the data of rainfall, vegetation cover, population density and so on, the risk assessment system of mountain torrent disaster was established. By integrating GIS and analytic hierarchy process (AHP), the mountain torrent disaster risks on the Loess Plateau in 1990 and 2020 were comprehensively evaluated based on the risk distribution map of each driving factor. [Results (1) The high-risk areas were mainly distributed in the southwest, south and east of the Loess Plateau. These areas had the characteristics of high rainfall intensity, dense population, developed economy and large cultivated land area. (2) During the period from 1990 to 2020, the overall risks of mountain torrent disasters on the Loess Plateau increased, showing that the areas with high risk expanded to its surroundings on the original basis, among which the southeast of Shanxi Province, the northwest of Qinghai Province and the northeast of Inner Mongolia were the most obvious. [Conclusion] The increased rainfall intensity, population density and GDP are the main driving factors on the increase of mountain torrent disaster risks in the past 30 years. It is necessary to continuously strengthen the prevention and control of mountain torrent disasters caused by extreme rainfall. [ABSTRACT FROM AUTHOR]

Copyright of Coal Science & Technology (0253-2336) is the property of Coal Science & Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Chinese Journal of Inorganic Analytical Chemistry / Zhongguo Wuji Fenxi Huaxue is the property of Beijing Research Institute of Mining & Metallurgy Technology Group and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Systems Engineering & Electronics is the property of Journal of Systems Engineering & Electronics Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to reduce the risk of water shortage of Qinhe River Basin, this paper took Qinhe River Basin as the research object, estimated the blue and green water resources in Qinhe River Basin from 2010 to 2016 based on the output results of the SWAT model, calculated the blue and green water scarcity index through the blue and green water footprint and the blue and green water availability, and quantitatively evaluated the blue and green water shortage situation in Qinhe River Basin by dividing four risk levels of blue and green water shortage. The results show that: a) The average annual blue water resources in Qinhe River Basin are 910 million m³, accounting for 12.0% of the total water resources, and the average annual green water resources are 6.69 billion m³, accounting for 88.0% of the total water resources, and the main component of water resources in Qinhe River Basin is green water resources; b) Under the annual scale, the blue water shortage index of most molecular basins in Qinhe River is greater than 1.0, and the risk level of blue water shortage is relatively serious risk, especially in Jiaozuo City in the downstream area; c) Under the annual scale, the index of green water scarcity in each subbasin of Qinhe River shows some differences, the average annual green water shortage index in most sub-basins is in the range of 0.5-1.0, and the green water shortage faces moderate risk; On the whole, the risk level of green water shortage is lower than that of blue water shortage. Based on the analysis of water shortage indexes of blue water and green water, it put forward suggestions on reducing the water safety risk of Qinhe River Basin. [ABSTRACT FROM AUTHOR]

Copyright of Water Conservancy Science & Techonlogy & Economy is the property of Water Conservancy Science & Technology & Economy Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Subsea immersed tunnels, have large construction scale, multiple structural types, high environmental requirements, and difficult construction management. There are many safety risks throughout the entire construction phase of the project. Taking the entire construction process of the Dalian Bay Immersed Tunnel Project as the research background, based on the characteristics of project construction, the HSE management method for engineering construction based on coupled matrix decomposition system was adopted to establish a risk assessment model for subsea immersed tunnel construction. The construction risk sources and factors were analyzed in detail and depth. From the perspective of system, a comprehensive evaluation index system for HSE risks in immersed tunnel engineering project was constructed, and the fuzzy comprehensive evaluation method was put forward by combining with fuzzy mathematics, which can comprehensively evaluate the HSE risk of immersed tunnel engineering project. Further explore the causes of HSE risks of subsea immersed tunnel engineering projects from the root, and gain a deeper understanding and grasp of the connotation of HSE risks in construction of subsea immersed tunnel engineering projects. So as to improve the construction management level of subsea tunnel projects. [ABSTRACT FROM AUTHOR]

With the continuous promotion of China's " going out " strategy and the Belt and Road Initiative, the demand for overseas geopolitical risk research is also increasing. Southeast Asia is a key region for the Belt and Road Initiative, with a complicated geographical environment and frequent geopolitical incidents. Based on geopolitical events, this paper proposes a geopolitical risk measurement method, taking Southeast Asia as an example to measure and analyze its spatio-temporal characteristics. Some conclusions can be drawn as follows: (1) Geopolitical risks in Southeast Asia are generally stable and controllable, but the spatio-temporal differences are large. It is relatively high in the Philippines and Myanmar, low in Laos, Singapore, Timor-Leste and Vietnam, and fluctuating in other countries. (2) The geopolitical risks of Indonesia, Cambodia, Thailand and Malaysia are more affected by internal events than those of the other five countries. Internal problems need to be solved urgently. Brunei, Laos, Timor-Leste, Vietnam and Singapore have high geopolitical risks affected by external events and relatively stable internal environments. (3) The geopolitical risks of South Asian countries are much more affected by external events than internal events, among which external events mainly come from countries outside the region such as the United States, China and Australia, while countries within the region account for a relatively low proportion, mainly from Thailand and Malaysia. The results of this study provide scientific support for grasping the geopolitical risks in Southeast Asia and ensuring the construction of the Belt and Road Initiative. [ABSTRACT FROM AUTHOR]

In order to ensure the safe operation of urban road traffic system and reduce the probability of urban traffic accidents, a risk evaluation model of urban road traffic system based on game theory combination empowerment cloud object element was proposed. Starting from the risk factors of urban road traffic system, combining with the Evaluation Indicator System of Urban Road Traffic Management, 15 risk evaluation indicators such as the proportion of trainee drivers were selected to construct the evaluation indicator system of “human-vehicle-road-ring”. Based on the cloud object element model, it solves the problem of ambiguity and randomness in the evaluation indexes, and at the same time, it uses game theory to optimize the combination of the expert scoring value processed by the C-OWA ordered weighting operator and the weights obtained by the improved entropy weighting method, and then calculates the risk level around the affiliation degree between the object element to be evaluated and the risk level. The model is applied to the road transportation system of a city A in the west of China to carry out the risk evaluation, and at the same time, the evaluation results of the model are compared with those of the C-OWA cloud object element model and the entropy weight cloud object element model. The study shows that the risk evaluation results of the indicators in the city A road transportation system obtained from the model are basically consistent with the results of the field visit research and the actual situation, and the game theory combination of empowerment cloud physical element urban road transportation system risk evaluation model is more practical and effective, which can provide a new way of thinking for the evaluation of the risk of the urban road transportation system. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Chongqing University of Technology (Natural Science) is the property of Chongqing University of Technology and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The hydrogen production station system is complex and vulnerable to external attacks, causing cascading failures and serious safety accidents. The cascading failure deduction method based on event tree was adopted to determine the consequences and occurrence probability of cascading failures of hydrogen production station equipment. On this basis, a cascading fault risk evaluation index system considering safety, economy and environmental protection was established. Considering the randomness and uncertainty of serious consequences and impact, a fuzzy membership function was used to quantify the evaluation index. Finally, a risk assessment model based on evidential reasoning was established and applied to the risk evaluation of hydrogen production station equipment, to realize the risk assessment and ranking of hydrogen production station equipment. The example shows that the method is feasible and effective, which provides a support for the next step of making safety precautions for hydrogen production station equipment.

Copyright of Power Generation Technology is the property of Power Generation Technology Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Organic pollutants were widely detected in marine fish in global oceans, and long-term consumption can pose certain health risks to humans. To study the pollution characteristics, 50 fish were collected in Xisha, China, in which Organochlorine pesticides (OCPs), polycyclic aromatic hydrocarbons (PAHs) and polychlorinated biphenyls (PCBs) were determined by GC-MS. It was found that OCPs, PAHs and PCBs concentrations in fish ranged from 2.23-91.57ng/g ww, 2.11-31.70ng/g ww and 1.55-54.04ng/g ww, respectively. The ratios of DDTs/(DDE+DDD)＞ 1 in 50% of fish. The ratio of ANT/(ANT+PHE)＞ 0.1 in 88% of fish and the ratio of FL/(FL+PYR)＞0.5 in 100% of fish. Using the ILCR model to evaluate the ecological risk of fish, the ILCR values of organic pollutants in most fish were below 1×10−6. [ABSTRACT FROM AUTHOR]

This research aims to study the source, spatial distribution characteristics and ecological risks of diuron in the coastal waters of the Yangtze River Estuary and Shanghai, water samples from 24 stations in the coastal waters of the Yangtze River Estuary, Hengsha Island （inland） waters and the waters near the Yangtze River Estuary Chinese sturgeon reserve were collected from October to November 2021, and the content of diuron in the surface water samples of each station was analyzed by solid phase extraction and high performance liquid chromatography tandem mass spectrometry. According to the test results, the mass concentration of diuron was detected in the water samples of 24 stations in three different regions. Among them, the detection range of diuron mass concentration at 10 stations along the Yangtze River Estuary in Shanghai was 182.43-439.38 ng/L, and the detection rate was 100%. The detection range of diuron mass concentration at 9 stations in Hengsha Island （inland） water area is 83.48-369.25 ng/L, and the detection rate is 100%. The detection range of diuron mass concentration at 5 stations near the Chinese sturgeon reserve is 1.97-2.85 ng/L, and the detection rate is 100%. The spatial distribution of diuron is mainly affected by factors like water transport, ship maintenance, agricultural activities, tides and seawater dynamics. Besides, the ecological risk assessment shows that the coastal waters along the Yangtze River Estuary in Shanghai are potentially at medium risk. Farming areas in Hengsha inland waters are at medium risk, and the nearby waters of the Nature Reserve are at low risk. The results show that the environment in the coastal waters of the Yangtze River Estuary in Shanghai is being threatened by the diuron, especially in the major ports and docks along the Yangtze River Estuary in Shanghai as well as the agricultural areas and river intersections in the Hengsha Island area. Although it will not threaten the Chinese sturgeon reserve in the short run, it still deserves attention. [ABSTRACT FROM AUTHOR]

Copyright of Geology & Exploration is the property of Geology & Exploration Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Beijing University of Technology is the property of Journal of Beijing University of Technology, Editorial Department and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Construction of urban tunnel engineering in mountainous karst regions involves a plethora of uncertain geological risk factors. Due to cost and schedule constraints, hydrogeological and engineering geological risk sources cannot be identified in detail, leading to frequent disasters. Expert scoring, which is influenced by human subjectivity, is a common method for disaster evaluation in tunnel engineering, and some evaluation indicators are difficult to quantify. In order to address these issues, Guiyang rail transit line 2 Phase I project was selected as a case study to establish a risk disaster evaluation system for urban tunnel engineering in mountainous karst regions. The location and type of the disasters during construction were recorded for 26 running tunnels, and geological risk factors that were significantly correlated were selected as evaluation factors. The coupling relationship between the frequency of disaster occurrence and the geological risk factors was inverted, leading to the establishment of the risk disaster evaluation system of urban tunnel engineering in mountainous karst region. The evaluation results demonstrate that the degree of consistency between the frequency of disaster occurrence and the segmentation results of the evaluation system is more than 69%, indicating that the evaluation system is capable of predicting the frequency of disaster occurrence effectively.

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Landscape ecological risk can be attributed to the cumulative effect of long-term disturbance in the regional landscapes by various risk sources. Fortunately, zoning control strategy can be expected to optimize the regional ecological risk using the dynamic perspective of the "history-present-trend" of risk occurrence. This study aims to scientifically understand the spatial differentiation pattern of landscape ecological risks, and then formulate spatial zoning management and control strategies. A systematic investigation was also made on the dynamic risk management and control needs of rapidly urbanized areas. The new framework was established for the landscape ecological risk assessment and management zoning from the spatiotemporal dynamic perspective of "history-present-trend". Taking the Jiangyin City of Jiangsu Province as the research area, the differentiated management and control strategy of risks was proposed to explore the spatiotemporal process, evolution characteristics, and future trends of landscape ecological risk. The combination characteristics of landscape risk levels were obtained from the coupling perspective of "history-current period and trend". The results showed that: 1) The cultivated land decreased by 12.76% from 2005 to 2020, whereas the construction land increased by 13.53% with the evolution of urbanization. There was a drastic transformation of landscape types, where the landscape fragmentation continued to increase. Among them, there was the more serious conversion of cultivated and ecological land into construction land. The fragmentation and uneven distribution were found in the landscape of cultivated and ecological land, with a significant trend in the agglomeration distribution of construction land. 2) The ecological risk presented a spatial distribution pattern of "low in the north and high in the south". The low-risk areas were distributed in the northern waters and the core area of township construction land, whereas, the high-risk areas were distributed in the southern waters, along the river, and the marginal area of township construction land expansion. Therefore, Jiangyin City was focused mainly on the expansion of construction land in the process of rapid urbanization. The high intensity and scattered construction caused the fragmentation landscape of cultivated and forest land, indicating the high risk. 3) The landscape ecological risks were categorized as the maintenance, upgrading, mitigation, and fluctuation types, according to the dynamic process of risks. The proportion of risk maintenance type was the highest, followed by upgrading and easing types, while the fluctuation type shared the lowest proportion. Furthermore, the control needs and trends of risks were further analyzed in the different regions to determine the specific prevention areas, according to the current situation and future trends of risks. There were also significant variations in the urgency of risk prevention for the management and control in different regions. Among them, much attention should be paid to the high-risk areas with serious out-of-control or a basic level of control. In summary, the risk assessment and management framework with the perspective of a "history-present-trend" landscape is beneficial to understanding the complex interaction between landscape and external disturbances in the urbanized areas from the dynamic process of time and space. The findings can also provide the decision support for the urban ecological risk management for the optimization of regional territorial spatial layout. [ABSTRACT FROM AUTHOR]

Copyright of Oil Drilling & Production Technology / Shiyou Zuancai Gongyi is the property of Shiyou Zuancai Gongyi Bianjibu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Reclaimed water reuse is an important way to solve the water crisis, but the presence of a large number of conditionally pathogenic bacteria in the secondary effluent of wastewater plants poses a potential risk to human health. The combined coagulation-precipitation-UF-NaClO disinfection process was used as a deep treatment process for secondary effluent to investigate the efficacy of the combined process in removing conditionally pathogenic bacteria ( Legionella, Pseudomonas aeruginosa, Mycobacterium avium) and Escherichia coli, and the reclaimed water landscape reuse (boating and lake tour, children playing in the water, stacked water flower platform viewing) was used as an evaluation scenario to evaluate the health risk of conditionally pathogenic bacteria and the sensitivity analysis of parameter uncertainty factors was performed. The results show that the combined coagulation-precipitation-UF-NaClO disinfection process has a good effect on the removal of three conditional pathogens and Escherichia coli in the water, and the removal rate can reach more than 98%, but there is no significant correlation between the concentration of Escherichia coli and the three conditional pathogens in the effluent, and its content can not completely indicate the content of the three conditional pathogens. The single infection probability of the three conditionally pathogenic bacteria in the secondary effluent treated by the combined process and reused in urban landscape recreational activities is low, and the safety guarantee rate for human health can reach 70. 9% ~ 100% . The results of sensitivity analysis show that the annual health risk values of infection with Legionella and Mycobacterium avium in all three exposure routes are most influenced by the uncertainty of annual exposure frequency (f). The annual risk values of infection with Pseudomonas aeruginosa in two exposure routes, boating and children playing in water, are more influenced by the uncertainty of exposure volume (v) and Pseudomonas aeruginosa concentration value (C). In conclusion, the combined coagulation-precipitation-UF-NaClO process can effectively control the concentration of conditionally pathogenic bacteria in the secondary effluent, and the microbial health risk in the reuse for landscape recreation activities is low. [ABSTRACT FROM AUTHOR]

Copyright of Industrial Minerals & Processing / Huagong Kuangwu yu Jiagong is the property of Industrial Minerals & Processing Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Construction of urban tunnel engineering in mountainous karst regions involves a plethora of uncertain geological risk factors. Due to cost and schedule constraints, hydrogeological and engineering geological risk sources cannot be identified in detail, leading to frequent disasters. Expert scoring, which is influenced by human subjectivity, is a common method for disaster evaluation in tunnel engineering, and some evaluation indicators are difficult to quantify. In order to address these issues, Guiyang rail transit line 2 Phase I project was selected as a case study to establish a risk disaster evaluation system for urban tunnel engineering in mountainous karst regions. The location and type of the disasters during construction were recorded for 26 running tunnels, and geological risk factors that were significantly correlated were selected as evaluation factors. The coupling relationship between the frequency of disaster occurrence and the geological risk factors was inverted, leading to the establishment of the risk disaster evaluation system of urban tunnel engineering in mountainous karst region. The evaluation results demonstrate that the degree of consistency between the frequency of disaster occurrence and the segmentation results of the evaluation system is more than 69%, indicating that the evaluation system is capable of predicting the frequency of disaster occurrence effectively. [ABSTRACT FROM AUTHOR]

The eastern Himalayan syntaxis is one of the regions having the most intense tectonic activities, the most complex geological conditions, and the most frequent geohazards in the world. The planning and construction of engineering projects are faced with four types of catastrophic geo-safety risks, including tectonic faulting in the plate tectonic belt, disaster occurrence of the deep-buried tunnels, instability of loose mountains, and regional geological disaster chain. It is a critical topic in the field of engineering geology how to select relatively stable and safe sites in active tectonic zones to minimize the geo-safety risks of planning, construction, and operation of engineering projects. This paper summarized the major geo-safety problems in the eastern Himalayan syntaxis. Accordingly, it revealed that traditional site selection theories hardly satisfy the requirements of the engineering projects in the eastern Himalayan syntaxis area. The site selection encounters geo-safety challenges caused by unclear geological evolution process and construction, prominent disaster risk of tectonic activity and strong earthquake, weak research on the deep tectonic stress field and disaster evaluation, and severe ultra-high-elevation and ultra-long-runout geological disaster chain. Thus, this paper suggested the main research directions of the site selection from five aspects: (1) regional geological evolution and engineering geological problems, (2) active fault and engineering safety risk, (3) complex in-situ stress field and engineering disaster risk, (4) engineering risk of regional geological disaster chain, and (5) theory and method of site selection in eastern Himalayan syntaxis. This paper provides ideas for improving the risk assessment and prevention methods of site selection of engineering projects.

The geological body management of gas storage is essential for the integrity management of Underground Gas Storage (UGS). However, the integrity management of geological body of gas storage is unclear in concept with fuzzy interface and incomplete system at present, and it is also limited to the integrity evaluation of gas reservoir UGS. Therefore, the concept of geological body of salt-cavern gas storage was defined based on the analysis of research results related to the geological body of gas reservoir UGS, and an integrity management system for geological body of salt-cavern gas storage was established. The results indicate that (1) the integrity management system for geological body of gas storage comprises 4 items, which are based on the hazard identification and data analysis and centered on the risk evaluation and integrity evaluation. (2) The risk analysis for geological body of salt-cavern gas storage focuses on the analysis of the 3 indicators, i.e., salt cavern shrinkage, gas leakage and land subsidence. (3) The salt-cavern storage integrity evaluation is composed of 3 major evaluation technologies, i.e., stability evaluation of salt cavern and surface, fault stability evaluation, and integrity evaluation of interbed and caprock. In conclusion, the establishment of the integrity management system for geological body of salt-cavern storage complements the shortage of geological body management in UGS integrity management, and also provides technical support and new application direction for the safe operation management.

Based on the analysis of the relevant literature on the risk evaluation of the owner of the water conservancy and hydropower EPC project before the contract award, combined with expert consultation and investigation and research of the water conservancy and hydropower EPC project, four decisive factors affecting the risk evaluation of the owner of the water conservancy and hydropower EPC project before the contract award were established, including the project achievement risk, the consulting achievement risk, the supervision achievement risk and the owner’s own situation risk and the entropy weight method was used to determine the weight of each risk index. Finally, the cloud model method was used to comprehensively evaluate the risk of the owner of a water conservancy and hydropower EPC project before the contract awarding, and the risk level of the owner of the water conservancy and hydropower EPC project before the contract awarding was reasonably determined. Therefore, the owner could reasonably control the risk of the water conservancy and hydropower EPC project before the contract awarding. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Guangdong Architecture Civil Engineering is the property of Guangdong Architecture Civil Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Proper management of vesicoureteral reflux (VUR) has remained one of the most controversial and complex issues in pediatric urology. Selecting management strategies and surgical indications of VUR should be based upon age, gender, grading, etiology, bladder function, heredity, urinary tract infection and renal status. And VUR patients should be stratified into different risk levels. And according to individual differences and risk factors, optimal treatments are devised to effectively improve the patient outcomes. [ABSTRACT FROM AUTHOR]

In order to comprehensively and objectively evaluate the risks faced by the underground comprehensive pipe corridor with large investment, wide coverage and long operation cycle, this paper takes a pipe corridor in Beijing as the object, based on the whole life cycle theory, identifies the risk factors in six stages of the whole life cycle of the pipe corridor, and establishes a risk index system consisting of 6 second-level and 43 third-level risk indicators. The comprehensive evaluation model of pipeline corridor risk based on AHP and Fuzzy was established, and the results were verified by weighted distribution method. The research results show that the overall risk of the whole life cycle of the studied pipe gallery belongs to the medium risk, of which the risk of abandonment stage is the highest, followed by construction and completion stage, operation stage, design stage, bidding stage and decision-making stage, and put forward targeted management measures.

Copyright of Journal of Agro-Environment Science is the property of Journal of Agro-Environment Science Editorial Board and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Fly Ash Comprehensive Utilization is the property of Hebei Fly Ash Comprehensive Utilization Magazine Co., Ltd. and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Urban fire risk assessment plays an important role in reducing fire losses, but establishing a simple and efficient risk assessment model has always been a difficult and hot issue. The fire risk assessment index system was established on the basis of full investigation and analysis of fire hazard, regional characteristics, and disaster prevention and mitigation capacity in Lintong District of Xi’an City. Ten evaluation indicators including fire load density, spatial distribution of major hazard sources, key firefighting unit area, and fire water supply capacity were selected, and the weight of each evaluation indicator was determined by using the analytic network process (ANP) structural operation. The 500 m×500 m fishing net was used as the evaluation unit to construct a fire risk assessment model, and the ArcGIS spatial analysis function was used to perform index quantification, evaluation unit division, and evaluation model operation, and finally the fire risk assessment map of Lintong District was obtained. As the evaluation result show that the overall fire risk in Lintong District is higher in the south and lower in the north, high-risk areas accounted for 1.81%, medium-risk areas accounted for 5.82%, sub-risk areas accounted for 16.85%, and low-risk areas accounted for 75.53%, high fire risk areas are mainly concentrated in the five sub-district offices of Lishan, Xiekou, Daiwang, Xinfeng and Beitian. According to the actual investigation on site, these sub-district offices are densely populated and have many major danger sources, indicating that the established risk assessment model is accurate, reliable, simple and efficient, and can provide a useful reference for fire risk assessment in other cities with similar fire-pregnancy environments. [ABSTRACT FROM AUTHOR]

The risk evaluation of tailing ponds is characterized by randomness, fuzziness and numerous uncertainties in the evaluation process. In order to effectively guarantee the operational safety of tailing ponds, a tailing pond risk evaluation method based on a combined assignment-cloud model is proposed. From a system analysis perspective, this paper applies the physical-substance-human-reason (WSR) system theory to explore the factors affecting the safe operation of tailings ponds from three aspects; subject factors, object factors and organisational forms, and constructs a WSR-based tailings pond risk evaluation index system. Secondly, the improved G1 method and CRITIC method are used to assign subjective and objective weights to the evaluation indicators respectively, and the game theory algorithm calculates the combination coefficients with the best weights to derive the combination weights. Finally, the cloud model theory is combined to calculate the relative affiliation and comprehensive characteristic value of each indicator, and the risk level is classified based on the principle of maximum affiliation, and the visualisation effect is presented in the form of a cloud chart. The evaluation method is validated using a tailings pond in Yunnan Province as an example, and the results are consistent with the actual situation, and compared with unknown measures and other methods. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Zhengzhou University: Engineering Science is the property of Editorial Office of Journal of Zhengzhou University: Engineering Science and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In the aftermath of power disturbance in power grid with high-penetration renewable integration， the frequency response trajectory is more likely to present large frequency deviation and high rate of change， which leads to a significant effect on frequency protection action. In order to accurately predict the frequency response characteristics of the system under the strong random operation mode， this paper uses the fast kernel learning algorithm based on the pseudo-inverse of the kernel matrix and integrates the key feature quantities obtained from the common mode frequency analysis to propose a frequency risk assessment method for power grid with high-penetration renewable integration. This method uses a set of mutually independent sample data to directly construct the regular term function through the pseudo-inverse operation of the kernel matrix， avoiding the convergence problems caused by the iterative solution of general machine learning algorithms without reducing the generalization ability of the learning results. The analysis of an example in the IEEE 39-node system verifies the effectiveness of the proposed method.

The existing research on flight test risk control techniques related to flutter/ASE test is not systematic enough,and has limited consideration of civil fly-by-wire aircraft characteristic and onboard flight test engineer.The flutter/ASE flight test risk control technique is systematically studied,which includes the theoretical evaluation,test modification,flight test method,flight test risk analysis,risk mitigation measures and emergency procedures formulation. Aiming at three identified hazards including flutter/ASE instability,adverse handling quality and local structure damage,a new technique is proposed for onboard flight test engineers to cutoff the excitation when the vibration limit is exceeded or abnormal. The dedicated ground monitor software is developed to perform the margin quantitative analysis of flutter/ASE in real time. The technique is applied to a certain model flight test for flutter/ASE flight test verification. The results show that the risk control technique can reduce the flight test risk and cost effectively,the manual cutoff technique can stop the excitation within 1 second to protect the aircraft structure safety,and the real-time analysis technique can calculate the stability margin quickly and improve the flight test efficiency.

Copyright of Geography & Geographic Information Science is the property of Geography & Geo-Information Science Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

The communication network is a highly interconnected system, and each risk has the potential to cause a chain reaction. Communication system security risk research focuses primarily on mobile terminal security, application security, and network information security, with no overall assessment of mobile communication system security. To address this issue, the Analytic Hierarchy Process-Fuzzy Comprehensive Evaluation (AHP-FCE) method was applied for the de overall security risk assessment of communication systems. Mobile communication system risks were classified into four first-level indicator categories: mobile terminal security risk, mobile network security risk, environmental risk, and human risk, which were further subdivided to eighteen second-level indicators. To avoid the problem of experts with different levels of experience having the same weight in the scoring method, the expert weight calculation method based on Fuzzy-AHP was applied, and the index weights were determined by combining the AHP with the expert weight calculation method. Moreover, a comprehensive risk factor evaluation matrix using the fuzzy evaluation method was established to derive the affiliation degree and risk range of each risk indicator of the mobile communication system. Finally, the risk assessment of the example was performed using the method introduced in this paper. The assessment results agreed with the manual research and evaluation results. Also, for various types of risk, the corresponding prevention and control measures were developed, providing new ideas for the risk assessment of communication systems. [ABSTRACT FROM AUTHOR]

Copyright of Acta Geoscientica Sinica is the property of Acta Geoscientica Sinica Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Qinghai Province is located in the northeastern part of the Qinghai Tibet Plateau and is deeply affected by global changes. Collapse, landslide, debris flow and permafrost geological disasters have attracted widespread attention. Comprehensive, systematic and comprehensive geological disasters evaluation is very important. Firstly, this study evaluates the susceptibility of geological disasters based on random forest (RF)algorithm. Then, the vulnerability of geological disasters is evaluated based on particle swarm analytic hierarchy process (PSO⁃AHP）. Next, on the basis of the susceptibility evaluation results, combined with the rainfall conditions of different years and the peak acceleration of ground motion minus the disasters resistance capacity, the geological disasters risk evaluation is carried out. Finally, the risk assessment of geological disasters is carried out from three aspects. The results show that the evaluation of geological disasters in Qinghai Province based on multi source remote sensing da⁃ ta and intelligent algorithm is accurate and reliable. The overall geohazard evaluation is not only helpful to grasp the overall law of disaster causing, but also can serve the production practice of disaster prevention and mitigation. The erbasin in northeastern Qinghai Province has a more active geological environment and a dense population distribution as a high prone and high risk area. Therefore, in the future geological disaster monitoring and early warning work, we should focus on the geological disaster monitoring and early warning of the Yellow River basin. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Railway Science & Engineering is the property of Journal of Railway Science & Engineering Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

In order to establish a more objective and more accurate assessment model of debris flow risk, the influencing factors of debris flow risk were analyzed. The dynamic weight system under different rainfall conditions was constructed by the analytic hierarchy process, and the fuzzy comprehensive evaluation method was used. The results show that with the change of rainfall intensity, the index weight presents the characteristics of nonlinear dynamic change. The membership degree of debris flow risk to each risk level in the study area changes continuously, which shows that the risk increases step by step with the increase of rainfall. The analysis shows that on the basis of considering the impact of the change of rainfall index value on the evaluation results, the proposed debris flow risk dynamic evaluation method takes into account the response of index weight to rainfall conditions, and the evaluation results are more accurate and more in line with the objective reality than the traditional methods. [ABSTRACT FROM AUTHOR]

Copyright of Journal of Engineering Management / Gongcheng Guanli Xuebao is the property of Journal of Engineering Management Editorial Office and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Copyright of Electric Power Automation Equipment / Dianli Zidonghua Shebei is the property of Electric Power Automation Equipment Press and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)