bluuebunny/crossref_metadata_2025_split huggingface dataset:
A four kinetic model for delayed coking process of Qingdao vacuum residues
Authors: Li Na , Wang Yonggang , Zhao Dan 
Published: July 2020

Abstract
Batch coking reaction experiments of Qingdao vacuum residues were carried out in the temperature range of 420–480 °C and at reaction times in the range of 5–90 min. A four lump kinetic model was developed for delayed coking process of Qingdao vacuum residues. The feedstock and products were considered as a unique and three separated lumps, respectively, in the model. The product lumps were included gas (C1~C4), distillate (C5+~500 °C) and coke (toluene insoluble and 500+ °C). Reactions were assumed in first order and based on Arrhenius reaction rates. The kinetic model was developed to predict unconverted feed values and product yields. The results showed a very good agreement between the experimental yield and predicted yield of different pseudocuts was obtained.
Radial seepage characteristics of polymer solution in microfractured reservoir based on a fractal network model
Authors: Liu Guangwei , Yang Xipu , Guo Liwen , Zhang Xin , Liu Jun , Kang Botao 
Published: July 2020

Abstract
Accurate assessment of polymers’ flow behaviour is one of the key task for polymer flooding design in micro-fractured reservoir. In this paper, a fractal net model is developed for characterizing polymer flow in the micro-fractured reservoir based on straight capillary model, generalized Darcy’s law and constitutive equation for power-law fluids. A mathematical model for predicting the variation of pressure drop and effective permeability of polymer flow in porous media with network microstructure parameters and polymer power index is proposed. The developed model will help to calculate and characterize effective permeability alteration during polymer solutions seepage in micro-fractured media.
Research on Well-seismic Characterization of Multi-layer Sandstone Reservoir
Authors: Chen Changkui , Zhang Pan , Nian Bin , Huang Dongan 
Published: July 2020

Abstract
Multi-layer sandstone reservoirs are one of the important types of A dilute oil reservoirs. They have reached the middle and later stages of development, with the following characteristics: controlled by multiple multi-level faults, many faults, small fault blocks, small fault block reservoir area; affected by sedimentation, the distribution of sand bodies is discontinuous and the connectivity is poor, resulting in serious reservoir heterogeneity; after long-term water injection scouring, the reservoir properties and oil-water properties have changed, and the remaining oil distribution is complicated. These characteristics determine that the research focus of this type of reservoir is to carry out fine characterization of reservoir well-seismic joints, establish the isochronous stratigraphic framework of the reservoir unit, analyze the characteristics of small faults and microstructures in the reservoir, and describe various sand bodies between wells. The internal heterogeneity and the three-dimensional spatial distribution regularity of the oilfield are used to establish a fine three-dimensional reservoir geological model, which provides strong technical support for revealing the spatial distribution characteristics and laws of the remaining oil.
Reservoir classification and evaluation of Yan'an formation in Xifeng Oilfield
Authors: Sun Ning , Zhang Zhipeng , Li Zhenhua , Chen Zhanjun 
Published: July 2020

Abstract
According to reservoir lithology and the combination of pore throat, this paper takes porosity, permeability, pore throat diameter and displacement pressure as evaluation parameters to classify and evaluate the reservoir. Yan'an Formation reservoir in Xifeng Oilfield is divided into four types, I, II, III and IV, which correspond to four types of good, medium, poor and non reservoir respectively.From class I to class IV reservoir, the reservoir performance changes from good to bad, the porosity and permeability decrease, and the heterogeneity increases. The results of geological analysis show that the classification results are reasonable and have certain guiding significance for the exploration and development of oil and gas in the oilfield.
Application of Water Exchange Physical Model in Artificial New Port Town
Authors: Liu Guozhen , Zhang Qinfeng , Wang Yazheng , Liu Pei 
Published: July 2020

Abstract
The water exchange capacity of artificial river system in the new town formed by reclamation in the coastal water is studied by means of water exchange tidal physical model test. The model test results show that the water exchange capacity of Lake Wood area with good hydrodynamic condition is best and except for the top of the curve and the north port, the water exchange capacity of meandering canal is better, while that of south port is the weakest. Through comprehensive analysis, it is found that water exchange capability is mainly depend on the unidirectional flow velocity and duration. Taking prototype current data as reference, it indicates that long time unidirectional flow exists in the artificial river system which is conducive to the water exchange of the artificial river system. The results of typical tide water exchange test point out that the Lake Wood, north port and Strolling Canal can meet the requirement of fulfilling one exchanging per week, but the south port which is semi-closed and weakest in hydrodynamic can’t meet the water exchange requirement. So it is suggested that the south port should be modified to meet the requirement of water exchange.
Hiking to Well-being: Leisure Benefits for Personal and Social Development
Authors: Zhang Caihong 
Published: July 2020

Abstract
In recent years, hiking has developed rapidly, but research on the leisure benefits of hiking is still ignored. This research takes the Ancient Tea-Horse Road in Pu’er Yunnan Province as an example, and adopts a qualitative research method to conduct in-depth interviews with 21 interviewees. On this basis, the paper analyzes the motivation of the Ancient Tea-Horse Road hikers and reveals the main significance of hiking. The results show that the Ancient Tea-Horse Road hiking is a valuable option for an economical and enjoyable activity. High popularity, low-cost consumption and being able to meet the participants' experience demand are the key factors to attract the hikers. Two key themes related to leisure benefits emerged. Firstly, for the person, hiking can bring the participants relaxation, challenge oneself, identify cultural quality, enhance interpersonal feelings and develop social relations as well as other positive effects. Secondly, for the society, hiking can enrich tourism leisure products, inherit historical and cultural heritage, and improve the quality of tourism and leisure industry. Finally, the leisure benefits generation mechanism model of the Ancient Tea-Horse Road hiking and implications are discussed.
The reflection on architectural form caused by global issues such as population and ecology
Authors: Liu Yang 
Published: July 2020

Abstract
In 2011, Singapore held the Asian vertical city project design competition. Saudi Arabia is building the Jeddah tower, which is expected to be completed in 2020 and will be the world’s first skyscraper with a height of 1,000 meters. Jeddah tower perfectly embodies the concept of “vertical city”, which maximizes the living space and can accommodate the increasing urban population. The vertical scheme is an alternative to the horizontal land consumption, so the appearance of high-rise buildings significantly changes the urban environment.
Biodegradation of Fluoranthene Contaminated Soil by Different Combinations of Bacteria
Authors: Wang Mingzhe , Zhang Haonan , Li Guangchun 
Published: July 2020

Abstract
In this study, different combinations of three fluoranthene degrading bacteria YN420, YN1, E420 complex microorganisms were constructed through orthogonal experiment, and applied to the biodegradation of fluoranthene contaminated soil to determine the optimal combination of complex microorganism. The results showed that the degradation rate of fluoranthene in a soil slurry of different combinations of complex bacteria was higher than that of three strains inoculated alone. The optimal combination ratio of complex microorganism was YN420: YN1:E420=2:1:1, and different ratios of complex microorganism could be enhanced to the bioremediation of fluoranthene in contaminated soil.
Adsorption characteristics of Pb (II) onto red clay, bentonite and bone char
Authors: Li Gang , Zhang Jinli , Liu Jia 
Published: July 2020

Abstract
The adsorption characteristics of red clay, bentonite, bone char, modified red clay (97% red clay+3% bone char) and modified bentonite (97% bentonite+3% bone char) on Pb(II) were studied by batch test. Based on the experimental results, the Langmuir model and quasi second-order kinetic model were used to fit the experimental data. The results showed that the adsorption of Pb(II) by red clay, bentonite, and bone char is a rapid reaction process, and the adsorption capacity of bone char is significantly greater than that of red clay and bentonite. Langmuir model and quasi second-order kinetic model can be used to describe the isotherm adsorption and kinetic characteristics of red clay, bentonite and bone char, respectively. The adsorption capacity of the modified red clay or bentonite is significantly increased, and the adsorption capacity of the bentonite with 3% bone char is the best liner filler for Pb(II) pollutants.
Risk Evaluating of Chongqing Yangtze River Highway Tunnel Environment
Authors: Wang Yu , Zhao Yan , Li Yongyu , Ge Xiaoyan , Wang Shihua 
Published: July 2020

Abstract
The quantitative description on risk analysis is the assumption of risk management. Traditional risk assessment methods of engineering project are often affected by subjective factors. Fuzzy comprehensive evaluation by entropy weight model serve as a tool provide us a way to assess the risk. This new method could reduce or avoid the effect of subjective factors and fuzzy factors. This article introduce the basic theory of the method and analyze the risk of Chongqing Yangtze River Highway Tunnel environment, then calculates various risks factor using the entropy power the weight, and combines fuzzy mathematics method to establish evaluation model by combining qualitative analysis and quantificational computability, to evaluate the risk factor and to draw the conclusion. The practical analysis has proven that this method is preferable and feasible.
Analysis and Optimization of Garbage Removal System in Jiamusi City
Authors: Jia Xiaoqian , Sun Yanbin , Wen Bin , Zhang Yuehua , Guan Jinqiu , Li Lan 
Published: July 2020

Abstract
With the development of the social environment, the amount of urban domestic garbage has increased rapidly, and garbage removal has become particularly important, which severely affects social-environmental resources. At present, the level of waste disposal Jiamusi City, far behind the rate of discharge of garbage, removal of garbage, and recycling efficiency is not high. To reduce environmental damage and waste of resources, it is necessary to improve the efficiency of waste removal and recycling. This paper analyses the current situation of the garbage removal and transportation system in Jiamusi City, establishes a mathematical model to solve it in mat lab, and uses genetic algorithm and particle swarm optimization to obtain the optimal path for garbage transportation. Combined with example verification, the results of the two algorithms are obtained and compared respectively, and an algorithm suitable for optimizing the waste removal path is derived.
Uptake of uranyl (UO2
2+) in water body by sago pondweed
Authors: Yi Zhengji , Liu Jian , Liu Xing , Zeng Rongying , Cui Ying 
Published: July 2020

Abstract
Uranium pollution is posing severe threat to the human environment. In the current research, we studied the applicability of Stuckenia pectinata (sago pondweed) powder as a new sort of biosorbent for uranyl removal from effluent. A series of batch experiments were conducted to explore impact of shaking time, solution pH, and initial U(VI) level upon U(VI) biosorption onto Stuckenia pectinata powder. The results show that the biosorption process is highly dependent upon pH value in the range of 3.0-6.5. The pH value of 5.5 is preferable to uranium elimination. The U(VI) biosorption equilibrium can be achieved after 60 min. The Stuckenia pectinata has a maximum uranium biosorption capacity of 268.82 mg·g−1. In brief, the obtained results suggest that Stuckenia pectinata may be utilized as a promising biosorbent for efficient removal of U(VI) from effluent.
The Effect of Environmental Engineering on Existing Venues and Operation Management: A Case Study of Minxiong Township
Authors: Liang Chou-fu , Li Xin-yu , Lin Tzu-Yun , Lin Hsiao-Hsien 
Published: July 2020

Abstract
This study investigated the effect of environmental engineering on existing venues and fields and operation management. By using a literature review, questionnaire, and qualitative methods, we interviewed 9 residents and collected 420 questionnaires. Subsequently, the collected data was analyzed using multiple examinations and discussed. Environmental engineering can promote economic, social, and environmental development. However, a lack of consensus regarding numerous challenges among decision makers and businesses can reduce the number of visitors and affect the efficiency of facility management. Challenges include reducing dust emissions, revising fence planning, adjusting transportation lines, improving site survey accuracy, and reducing construction errors. These problems can affect visitor numbers and operation management even if businesses are effective in operation, marketing, and management and maintain professional teaching and service quality.
Study and development of emergent dispatching system for sudden water pollution accidents
Authors: Chai Fuxin , Xie Xinmin , Li Jianxun 
Published: July 2020

Abstract
Because of the frequent incidents of water pollution in China, the ecological environment and the socio-economic along the river are threatened seriously. In order to improve the ability of dealing with sudden water pollution accidents, the emergency dispatching system of sudden water pollution accidents is constructed by using data mining, database, GIS and other technologies combined with reservoir operation model, hydrodynamic model and water quality model. The main functions of the system include that the information management, scheme generation, simulation of water quality and quantity, emergency dispatch, and three-dimensional simulation. Applied research is carried out in Songhua River basin, which can provide technical support and decision-making platform for sudden water pollution accidents.
Study on Eco-health Evaluation of Ledum-Larixgmelinii Forest in Cold Temperate Zone
Authors: Gu Ye , Shen Penglin , Ren Guoli , Zhang Wu , Zhang Yuehua , Guan Jinqiu , Li Lan 
Published: July 2020

Abstract
Field surveys set standard measurement indicators, use principal component analysis to screen indicators, determine weights, construct evaluation models, and use cluster analysis to classify Durian larch forest health grades. Three types of Ledum-Larixgmelinii forest in the clearcut forest were studied for health evaluation. The results of the study show that: forest stand productivity, soil nutrients, organizational structure, resistance, and resilience have identified 19 indicators that are more important for the health of Duxiang-Xing’an larch forest. A forest health assessment index system of Ledum-Larixgmelinii forest was established. The principal component analysis method was used to select comprehensive indexes such as comprehensiveness, resilience, plant diseases, and insect pests, plant species diversity, fire disturbance degree, structural rationality, soil nutrients and natural disturbance, as the evaluation indicators of Ledum-Larixgmelinii larch forest. Although the overall health status of the Ledum-Larixgmelinii forest is generally good, there are still areas of forest with health problems. Through analysis, the primary forest has the highest health index and the best health status. It can be seen that the forest grown in the original state has a stable structure, high vitality, strong resistance, and strong sustainability. The health level of the declining forest is second only to that of the primary forest. In clearing forests, there are two kinds of clearing forests in the study area. Among them, 2/3 of the forest are poor, and 1/3 of the forest are in the middle, but the health of the clear cutting forest is the lowest overall.
A Study on the Evaluation of Urban Tourism Competitiveness in Guangdong-Hong Kong-Macao Greater Bay Area
Authors: Yang Liang , Yu Li 
Published: July 2020

AbstractAiming at the shortcomings in the existing research on tourism competitiveness, the article adjusted the regional tourism competitiveness evaluation index system and used the entropy method to quantitatively evaluate the tourism competitiveness of 11 cities in the Guangdong-Hong Kong-Macao Greater Bay Area from 2012 to 2018. The results show that the regional tourism competitiveness of Guangdong-Hong Kong-Macao Greater Bay Area differs significantly and can be divided into three levels. Hong Kong, Macau, Guangzhou, and Shenzhen generally have higher tourism competitiveness and are in the first rank; Zhuhai, Foshan, Huizhou, and Dongguan have average tourism competitiveness and are in the second rank; The tourism competitiveness of Zhongshan, Jiangmen and Zhaoqing is relatively weak, ranking third. Based on the conclusions of the study, the article puts forward relevant suggestions to enhance the tourism competitiveness of the Guangdong-Hong Kong-Macao Greater Bay Area, hoping to provide a reference for enhancing the tourism competitiveness of the Guangdong-Hong Kong-Macao Greater Bay Area and promote the construction of international tourism destinations in the Guangdong-Hong Kong-Macao Greater Bay Area.
Optimization of Extraction Process of Valeriana officinalis L. Root Essential Oil and Study on Its Anti-Free Radical Activity
Authors: Miao Tianlin , Zheng Hongjuan , Wang Xue , Lan Ying , Zhang Yuehua , Song Yujun , Li Lan 
Published: July 2020

Abstract
Taking Valerianrhizome as raw material and the yield of volatile oil of Valerian as an index, the extraction process of valerian volatile oil was analyzed by microwave assisted steam distillation, and optimized by Box-Behnken response surface test. The effects of scavenging capacity of Li, DPPH and hydroxyl radicals on their antioxidant capacity were studied. The results showed that the optimal process conditions of microwave extraction of volatile oil of Valerian were 350W microwave power, extraction time 25min, liquid-to-material ratio 8.8mL: 1.0g, and the yield of volatile oil of Valerian extracted under this condition was 5.88%. Microwave-extracted volatile oil of Valerian has strong scavenging ability and high reducing power to DPPH free radicals and hydroxyl free radicals. Compared with steam distillation, it has obvious differences, which can provide reference for the development of antioxidant products of Valerian oil.
Study on the Influence of Premix Uniformity on NOx Emission Concentration in 9E Gas Turbine Combustion Chamber
Authors: Ding Yang 
Published: July 2020

Abstract
In this paper, a numerical simulation is performed on the basis of a combustion chamber of 9E gas turbine, to study the effect of premix uniformity on the NOx emission concentration. The results show that when the 9E gas turbine is working under the baseload with a fuel flow ratio of the primary nozzle R
fuel deviates within an optimal interval of 78 % to 84 %, an increment in the number of secondary nozzle fuel injection points leads to a decline in NOx emission concentration. Since purge air nozzles of DLN are placed in upstream of swirl generator while the nozzles are placed downstream of swirl generator in LEC, the impact of the purge airflow rate on the NOx emission in the DLN has an opposite trend with that in the LEC. Besides, the increment of the mixed air proportion R
air leads to a distinct enhancement in the local equivalence ratio peak value of the primary combustion zone outlet. Also, the distribution of the equivalence ratio changes. The NOx emission concentration is influenced as a result.
Analysis on the Influence of Different Setting Conditions on the Short Circuit Current Calculation Results of PSD-SCCP
Authors: Wu Jianbin , Zheng Xiaoming , Gao Yi , Zhao Haibo , Wu Zhong , Wang Peng 
Published: July 2020

Abstract
The result of power system short circuit calculation and verification is important reference for power system relay protection, electrical automatic device setting, transient process research, electrical planning and design and equipment selection. In the process of short circuit calculation, different conditional combination mode may lead to different results. The aggressive conditional combination mode will lead to the decline of power grid security performance, on the contrary, the conservative conditional combination mode will lead to the rapid increase of investment cost, resulting in a certain amount of investment waste. At present, there is no unified short circuit current calculation standard in the industry. Based on the actual power grid calculation example of a province in China, the short circuit current results of six condition combination modes is calculated and analyzed in this paper, expecting to provide an important reference for the setting of short circuit current calculation conditions.
Study on Gas Recovery Program Optimization in Deep Water Gas Reservoir
Authors: Li Zhong , Zhi Ji-qiang , Meng Wen-bo , Zhang Chong , Dong Zhao 
Published: July 2020

Abstract
LS-17 gas field is China’s first self-operated deep-water gas field in the south China sea. Located in the southeast of hainan island, the gas field has a depth of 1220-1560 meters. According to the gas reservoir characteristics of ls-17 gas field, the gas reservoir model and numerical model of water control process of ls-17 gas field are established, the productivity of existing wellhead gas reservoir is predicted, the gas production plan of gas reservoir is optimized, and the optimal solution of recovery rate of compressed gas reservoir is given under different system changes, different processes and different development modes. In this paper, the gas production rate and recovery rate at different gas production rates are predicted, and the gas recovery rate is optimized. The development method of intermittent gas production is put forward, and the parameters of intermittent gas production are not optimized. The deep water gas reservoir is characterized by high energy and serious water intrusion. This paper compares and evaluates the recovery efficiency under different water control technologies, and proposes a method for selecting water control technology measures in the process of gas reservoir development. The research ideas and methods in this paper effectively support the scientific decision-making of gas recovery program in LS-17 gas field and have certain guiding significance for the development of deepwater gas reservoirs in the south China sea.