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A micro-crosslinked amphoteric hydrophobic association copolymer as high temperature-and salt-resistance fluid loss reducer for water-based drilling fluids

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Petroleum Science 2024年第3期21卷 1980-1991页

作者： jian Li Yu-Xi ji Xiao-Xiao Ni Kai-He Lv Xian-Bin Huang jin-Sheng sun School of Petroleum Engineering China University of Petroleum(East China)Qingdao266580ShandongChina Key Laboratory of Unconventional Oil&Gas Development China University of Petroleum(East China)Qingdao26650ShandongChina Inspection and Testing Center of Huabei Oil Field Company PetroChinaRenqiu062552HebeiChina Drilling Fluid Research Institute CNPC Engineering Technology R&D Company LimitedBeijing102206China

During ultradeep oil and gas drilling,fluid loss reducers are highly important for water-based drilling fluids,while preparing high temperature-and salt-resistance fluid loss reducers with excellent rheology and filtration performance remains a ***,a micro-crosslinked amphoteric hydrophobic association copolymer(i.e.,DADC)was synthesized using N,N-dimethyl acrylamide,diallyl dimethyl ammonium chloride,2-acrylamido-2-methylpropane sulfonic acid,hydrophobic monomer,and pentaerythritol triallyl ether *** to the synergistic effects of hydrogen bonds,electrostatic interaction,hydrophobic association,and micro-crosslinking,the DADC copolymer exhibited outstanding temperature-and *** rheological experiments have shown that the DADC copolymer had excellent shear dilution performance and a certain degree of salt-responsive viscosity-increasing *** DADC copolymer could effectively adsorb on the surface of bentonite particles through electrostatic interaction and hydrogen bonds,which bring more negative charge to the bentonite,thus improving the hydration and dispersion of bentonite particles as well as the colloidal stability of the drilling ***,the drilling fluids constructed based on the DADC copolymer exhibited satisfactory rheological and filtration properties(FLHTHP=12 m L)after aging at high temperatures(up to200℃)and high salinity(saturated salt)***,this work provided new insights into designing and fabricating high-performance drilling fluid treatment agents,demonstrating good potential applications in deep and ultradeep drilling engineering.

关键词： Fluid loss reducer Temperature-and salt-resistance Hydrophobic association Amphoteric Micro-crosslinking

Enzymatic C1 reduction using hydrogen in cofactor regeneration

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Frontiers of Chemical Science and Engineering 2024年第7期18卷 33-40页

作者： Ruishuang sun Chenqi Cao Qingyun Wang Hui Cao Ulrich Schwaneberg Yu ji Luo Liu Haijun Xu Beijing Bioprocess Key Laboratory Beijing University of Chemical TechnologyBeijing 100029China Institute of Biotechnology Rheinisch-Westfälische Technische Hochschale(RWTH)AachenAachen 52074Germany

Carbon dioxide fixation presents a potential solution for mitigating the greenhouse gas *** carbon dioxide fixation,C1 compound reduction requires a high energy *** calculations suggest that the energy source for cofactor regeneration plays a vital role in the effective enzymatic C1 *** utilizes renewable hydrogen to achieve the regeneration and supply cofactor nicotinamide adenine dinucleotide(NADH),providing a driving force for the reduction reaction to reduce the thermodynamic barrier of the reaction cascade,and making the forward reduction pathway thermodynamically *** on the regeneration of cofactor NADH by hydrogenase,and coupled with formaldehyde dehydrogenase and formolase,a favorable thermodynamic mode of the C1 reduction pathway for reducing formate to dihydroxyacetone(DHA)was designed and *** resulted in accumulation of 373.19μmol·L^(-1) DHA after 2 h,and conversion reaching 7.47%.These results indicate that enzymatic utilization of hydrogen as the electron donor to regenerate NADH is of great significance to the sustainable and green development of bio-manufacturing because of its high economic efficiency,no by-products,and environment-friendly ***,formolase efficiently and selectively fixed the intermediate formaldehyde(FALD)to DHA,thermodynamically pulled formate to efficiently reduce to DHA,and finally stored the low-grade renewable energy into chemical energy with high energy density.

关键词： [NiFe]-hydrogenase SH formolase NADH regeneration C1 compound reduction thermodynamic calculation

The Effect and Mechanism of Fructus lycii on Improvement of Exercise Fatigue Using a Network Pharmacological Approach with in vitro Experimental Verification

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Biomedical and Environmental Sciences 2024年第1期37卷 42-53页

作者： ji Xiao Ning LIU Zhao ping ZHANG Chao Zheng CHEN Min LIANG jiang LU jiang ZHANG Lei National Resource Center for Chinese Materia Medica China Academy of Chinese Medical SciencesBeijing 100700China China National Center for Food Safety Risk Assessment Beijing 100022China Chinese Center for Disease Control and Prevention Beijing 102206China

Objective This study aimed to investigate the effect and underlying mechanism of Fructus lycii in improving exercise *** A network pharmacological approach was used to explore potential mechanisms of action of Fructus *** muscle C2C12 cells and immunofluorescence were employed to verify the effect and mechanism of the representative components in Fructus lycii predicted by network pharmacological *** Six potential active components,namely quercetin,β-sitosterol,stigmasterol,7-Omethylluteolin-6-C-beta-glucoside_qt,atropine,and glycitein,were identified to have potency in improving exercise fatigue via multiple pathways,such as the PI3K-Akt,neuroactive ligand-receptor interaction,IL-17,TNF,and MAPK signaling *** immunofluorescence results indicated that quercetin,a significant active component in Fructus lycii,increased the mean staining area of 2-NBDG,TMRM,and MitoTracker,and decreased the area of CellRox compared to the ***,the protein expression levels of p-38 MAPK,p-MAPK,p-JNK,p-PI3K,and p-AKT markedly increased after quercetin *** Fructus lycii might alleviate exercise fatigue through multiple components and *** these,quercetin appears to improve exercise fatigue by enhancing energy metabolism and reducing oxidative *** PI3K-AKT and MAPK signaling pathways also appear to play a role in this process.

关键词： Fructus lycii Exercise fatigue Network pharmacology

Development and technology status of energy storage in depleted gas reservoirs

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International Journal of Coal Science & Technology 2024年第2期11卷 198-221页

作者： jifang Wan Yangqing sun Yuxian He Wendong ji jingcui Li Liangliang jiang Maria Jose Jurado China Energy Digital Technology Group Co. Ltd.Beijing 100044China School of Mechanical Engineering Yangtze UniversityJingzhou 434023China Department of Chemical and Petroleum Engineering The University of CalgaryCalgaryAlbertaCanada Geosciences Barcelona CSIC Spanish National Research Council08028 BarcelonaSpain

Utilizing energy storage in depleted oil and gas reservoirs can improve productivity while reducing power costs and is one of the best ways to achieve synergistic development of"Carbon Peak–Carbon Neutral"and"Underground Resource Utiliza-tion".Starting from the development of Compressed Air Energy Storage(CAES)technology,the site selection of CAES in depleted gas and oil reservoirs,the evolution mechanism of reservoir dynamic sealing,and the high-flow CAES and injection technology are *** focuses on analyzing the characteristics,key equipment,reservoir construction,application scenarios and cost analysis of CAES projects,and sorting out the technical key points and existing *** devel-opment trend of CAES technology is proposed,and the future development path is scrutinized to provide reference for the research of CAES projects in depleted oil and gas reservoirs.

关键词： Depleted gas reservoirs Technology and development Siting analysis Safety evaluation Compressed air energy storage

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贵州特有药用植物的种类与分布

中国中药杂志 2005年第10期30卷 735-738页

作者：孙济平何顺志贵阳中医学院药学系贵州贵阳550002

目的:介绍贵州特有药用植物的种类、地理分布,为种质资源的收集、保护及合理开发利用提供依据。方法:通过野外考察、资料收集及标本鉴定进行研究。结果:发现贵州特有药用植物80余种。结论:贵州特有药用植物种类多,多数种分布区狭窄,种... 详细信息

目的:介绍贵州特有药用植物的种类、地理分布,为种质资源的收集、保护及合理开发利用提供依据。方法:通过野外考察、资料收集及标本鉴定进行研究。结果:发现贵州特有药用植物80余种。结论:贵州特有药用植物种类多,多数种分布区狭窄,种群数量稀少,部分种类具有较高的药用价值和科研价值。

关键词：特有药用植物贵州合理开发利用地理分布种质资源标本鉴定资料收集植物种类种群数量科研价值药用价值分布区

Adaptive Predefined-Time Backstepping Control for Grid Connected Photovoltaic Inverter

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Energy Engineering 2024年第8期121卷 2065-2083页

作者： jiarui Zhang Dan Liu Kan Cao ping Xiong Xiaotong ji Yanze Xu Yunfei Mu Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin300072China State Grid Hubei Electric Power Research Institute Wuhan430077China State Grid Hubei Electric Power Co. Ltd.Wuhan430077China

The system performance of grid-connected photovoltaic(PV)has a serious impact on the grid *** improve the control performance and shorten the convergence time,a predefined-time controller based on backstepping technology and dynamic surface control is formulated for the inverter in the grid-connected *** time-varying tuning functions are introduced into state-tracking errors to realize the predefined-time control *** address the“computational explosion problem”in the design process of backstepping control,dynamic surface control is adopted to avoid the analytical calculations of virtual *** disturbances of the PV system are estimated and compensated by adaptive *** control parameters are chosen and the global stability of the closed-loop is ensured by Lyapunov *** results confirm the effectiveness of the proposed controller and ensure the predefined time control in the photovoltaic inverter.

关键词： Photovoltaic inverter system backstepping technology predefined-time control adaptive control

Data-Driven Adaptive Predictive Control Method With Autotuned Weighting Factor for Nonlinear Systems Using Triangular Dynamic Linearization

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IEEE/CAA Journal of Automatica Sinica 2024年第8期11卷 1880-1882页

作者： Zhong-Hua Pang Yumo Zhang Xueyuan sun Shengnan Gao Guo-ping Liu Key Laboratory of Fieldbus Technology and Automation of Beijing North China University of TechnologyBeijing 100144China School of Data Science Capital University of Economics and BusinessBeijing 100070China Center for Control Science and Technology Southern University of Science and TechnologyShenzhen 518055China

Dear Editor,In this letter,a novel data-driven adaptive predictive control method is proposed using the triangular dynamic linearization *** proposed method only contains one time-varying parameter with explicit physical meaning,which can prevent severe deviation in parameter ***,a triangular dynamic linearization(TDL)data model is employed to predict future system outputs,and then to correct inaccurate predictive outputs,a feedback regulator is *** autotuned weighing factor is introduced to alleviate the computational burden in practical applications and further improve output tracking ***-loop stability conditions are derived by rigorous *** results are provided to demonstrate the efficacy of the proposed method.

关键词： estimation technique method

Design and test of the key components for a combing-type tobacco harvester

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International Journal of Agricultural and Biological Engineering 2024年第1期17卷 145-153页

作者： Chaoran sun Shaohui Tan Songling sun Mingtao Xiao Limei Chen Wenke Ai Zhihua Qiu ping jiang Yang He School of Mechanical and Electrical Engineering Hunan Agricultural UniversityChangsha 410128China Truking Technology Limited Ningxiang 410600HunanChina Construction of tobacco leaf production infrastructure of Hunan Province Company of China National Tobacco Corporation office Changsha 410009China

In response to the problems of low efficiency,high labor intensity,and low mechanization in manual tobacco harvesting,a comb-off tobacco picking device for southern hilly tobacco areas was designed following the agronomic requirements and the principle of manual picking of tobacco harvesting in southern *** device was composed of the power chassis,picking mechanism,and storage *** study involved the theoretical analysis,structural design,and modeling of the key components,such as chassis structure,combing-type picking mechanism,and power synchronization *** results of the motion analysis and calculation of the picking process demonstrated that the adjustment range of the comb chain elevation angles was from 12.4°to 20.9°,the comb rod installation distance was 76.2 mm,and the synchronizing mechanism transmission ratio was 3:***-factor test and three-factor three-level orthogonal test was performed with the forward speed of the chassis,the distance between the picking device baffles and the elevation angle of the chain with the combing bar as test factors,and the rate of broken and missed tobacco picking as evaluation *** was revealed that the optimal combination of the forward speed of the chassis,the distance between the baffles,and the chain elevation angle were 1.5 km/h,75 mm,and 12.4°,***,verification tests suggested that the breakage rate of tobacco leaves was 9.99%,and the probability of missed tobacco picking was 7.31%,both of which satisfy the agriculture requirements and the operational requirements in the agricultural machinery certification syllabus.

关键词： harvesting machinery leaf tobacco combing-type tiered harvest synchronizing mechanism

Quantitative characterizations of anisotropic dynamic properties in organic-rich shale with different kerogen content

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Petroleum Science 2024年第2期21卷 855-865页

作者： jian-Yong Xie Yan-ping Fang Xing-Hua Wu jian'er Zhao Jun-Cheng Dai Jun-Xing Cao ji-Xin Deng State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation Chengdu University of TechnologyChengdu610059SichuanChina Key Lab of Earth Exploration&Information Techniques of Ministry of Education Geophysical InstituteChengdu University of TechnologyChengdu610059SichuanChina PetroChina Southwest Oil&Gasfield Company Chengdu610017SichuanChina

Understanding the quantitative responses of anisotropic dynamic properties in organic-rich shale with different kerogen content(KC)is of great significance in hydrocarbon exploration and *** controlled experiments with a single variable is challenging for natural shales due to their high variations in components,diagenesis conditions,or pore *** employed the hot-pressing technique to construct 11 well-controlled artificial shale with varying *** artificial shale samples were successive machined into prismatic shape for ultrasonic measurements along different *** revealed bedding perpendicular P-wave velocities are more sensitive to the increasing KC than bedding paralleling velocities due to the preferential alignments of *** elastic stiffnesses except C_(13)are generally decreasing with the increasing KC,the variation of C_(1) and C_(33)on kerogen content are more sensitive than those of C_(44)and C_(66).Apparent dynamic mechanical parameters(v and E)were found to have linear correlation with the true ones from complete anisotropic equations independent of KC,which hold value towards the interpretation of well logs consistently across formations,Anisotropic mechanical parameters(ΔE and brittlenessΔB)tend to decrease with the reducing KC,withΔB showing great sensitivity to KC *** the range of low KC(10%)shale,compilation of data from natural organic rich-shales globally verified the similar systematic relationships that can be empirically used to predict the fraction of KC in shales.

关键词： Elastic properties Organic shale Anisotropy Kerogen content Physical modeling