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Improvement of comprehensive performance of compound green soil in sponge city
Lei Zhang,Zhicheng Li,Tianliang Yang,Ping Yang 대한환경공학회 2021 Environmental Engineering Research Vol.26 No.5
Large-scale constructions of urbanization increase the impervious areas of city, leading to the urban hydrological effects such as urban waterlogging and rainwater runoff pollution. To this end, China proposed to adopt the measure to build sponge cities. However, the existing green soil cannot meet the comprehensive needs of sponge city. In order to quickly evaluate the comprehensive performance of the soil in sponge city, a comprehensive evaluation criterion was designed, which is related to the characteristics of greening soil permeability, porosity, pH, salinity and fertility. Based on the criterion, a new type of composite green soil was obtained with the silt soil: medium sand: sawdust ratio of 72.5%: 20%: 7.5%. Finally, compared with the existing soil, the new green soil not only meets the comprehensive performance requirements of the green soil’s fertility, pH, permeability and other factors, but also has higher permeability and water retention. It was proved that the new green soil has apparent advantages in the control of rainwater.
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Qingming Cao,Jianye Yan,Zhicheng Sun,Limin Gong,Hongnian Wu,Shihan Tan,Yating Lei,Bo Jiang,Yuanqing Wang 한국식품과학회 2021 Food Science and Biotechnology Vol.30 No.1
The asparagus of Triarrhena lutarioriparia (TL)is a popular vegetable with abundant chemical compoundsin China. This study aims to optimize the ultrasound-assistedextraction (UAE) method for its content of totalflavonoid and antioxidant activities by response surfacemethodology (RSM). Box-Behnken design was adopted toevaluate the influences of ethanol concentration, extractiontime and solvent-to-sample ratio on the extraction yield oftotal flavonoid and the antioxidant activity. Considering themaximum content of extracted total flavonoids andantioxidant activity, the optimal extraction conditions wereacquired with 70% (v/v) ethanol by UAE for 60 min at asolvent-to-sample ratio of 40 mL/g. The proportion of theextraction of total flavonoid was 15.88 mg/g and antioxidantactivity reached 79.53%. The RSM would be recommendedas an appropriate model for simultaneousoptimization of the UAE conditions for the content of totalflavonoid and the antioxidant activity of asparagus of TL.
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The game strategy of the enterprise reliability development
Kun Tian,Chang"an Zhu,Xia Ge,Zhicheng Yao,Lei Li 인하대학교 정석물류통상연구원 2009 인하대학교 정석물류통상연구원 학술대회 Vol.2009 No.10
Due to the increasing importance of equipment reliability and asymmetric information between the military and military enterprises, it is of great practical significance to study equipment reliability. This paper first reviews the current prevalent game model of both entities, and points out its insufficiency. Then, to resolve the problem, the paper constructs a game model based on penalty mechanism and obtains an optimum equilibrium. Finally, this paper makes a detailed analysis on the game strategies of both participants, which provides useful suggestions to the equipment reliability improvement.
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Junwei Zhao,Huaimin Xu,Cui He,Lin Li,Zhen Yi,Huijing Fang,Zhicheng Lei 한국지질과학협의회 2017 Geosciences Journal Vol.21 No.2
The Junggar basin is rich in oil and gas resources, and recently, unconventional oil and gas reservoirs have become important targets. Significant amounts of oil and gas are located in Permian formations in the Shazhang–Dajing area, however, fewer studies have focused on unconventional oil and gas reservoirs, particularly on the factors controlling the distribution of unconventional reservoirs. In this study, a sequence stratigraphic framework of the study area was developed based on cores, well logs and seismic data. Source rock samples were analyzed, including tests of kerogen, vitrinite reflectance, chloroform bitumen, organic carbon and group composition. The physical properties and pore characteristics of reservoir samples were also analyzed using scanning electron microscope and high resolution electron microscope. The Permian Pingdiquan Formation comprises three thirdorder sequences in which individual sequence can be divided into a low-stand system tract (LST), a transgression system tract (TST), an early high-stand system tract (E-HST), and a late high-stand system tract (L-HST). Several source rock lithologies have high total organic carbon (TOC), and are matured, having excellent hydrocarbon generation potential. Clastic and dolomitic rocks are the main reservoirs, and nanometer-scale pores are the main reservoir space in the tight reservoirs. The distribution of tight oil is controlled by the sequence stratigraphy, palaeogeomorphic units, and sedimentary facies. The fine sediments, which were generally deposited near the initial flooding surface (FFS) and the maximum flooding surface (MFS), are favorable zones for tight oil. The distributions of the hydrocarbon source rocks are controlled by the depositional environment, depending on the palaeogeomorphic units; the deep depression in the Huoshaoshan area and the moderately-deep depression in the Shishugou area are two distinct hydrocarbon generating centers. The distribution of tight oil is clearly controlled by the sedimentary facies; the tight oil is mainly located in the fan delta front and lacustrine depositional environments. The distribution of tight oil in this area is summarized, and favorable areas of tight oil are proposed.
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