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Stochastic prediction and control to methane in coalmine

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Journal of Coal Science & Engineering(China) 2011年第3期17卷 321-325页

作者： wu wen-zhong College of Energy Science and Engineering Xi＇an University of Science and Technology Xi＇an 710054 China

The ventilation system plays an essential role in underground workings, and improvements in dilution effect to stochastic methane build-up at cul-de-sac of a coalmine require the installation of mixed ventilation system. For 4-12-1 I N02.8A centrifugal ventilation fan, the characteristic operating function of its mixed ventilation system is calculated from ventilation quantity and total pressure in the actual working status. At cul-de-sac of the reference coalmine, the evolution of methane concentration is a compound Poisson process and equivalent to a Brownian motion for Gaussian distributed increments. Solution of stochastic differential equation driven by mixed ventilation system, with dilution equation for its closure, provides parameters of mine ventilation system for keeping methane concentration within the permissible limit at cul-de-sac of the reference coalmine. These results intend to shed some light on application of blowing-sucking mixed ventilation systems in underground workings, and establish stochastic trends to consider methane control in coalmines.

关键词： mine ventilation coalmine methane control stochastic prediction

Optimization of control parameters for petroleum waste composting

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Journal of Environmental Sciences 2001年第4期13卷 385-390页

作者： MA Ying ZHANG Jia yao WONG Ming Hung wu wen zhong Department of Biology and Institute for Natural Resource and Waste Management Hong Kong Baptist UniversityKowloon TongHong KongChina Department of Environmental Science Wuhan UniversityWuhan 430072China State Key Laboratory for Freshwater Ecology and Biotechnology Institute of HydrobiologyChinese Academy of SciencesWuhan 430072China

Composting is being widely employed in the treatment of petroleum waste. The purpose of this study was to find the optimum control parameters for petroleum waste in-vessel composting. Various physical and chemical parameters were monitored to evaluate their influence on the microbial communities present in composting. The CO2 evolution and the number of microorganisms were measured as the activity of composting. The results demonstrated that the optimum temperature, pH and moisture content were 56.5 - 59.5 degreesC, 7.0 - 8.5 and 55 % - 60%, respectively. Under the optimum conditions, the removal efficiency of petroleum hydrocarbon reached 83.29% after 30 days composting.

关键词： optimization control parameters petroleum waste composting

障眼明片治疗轻中度非增殖性糖尿病视网膜病变的疗效

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中国药物经济学 2024年第1期19卷 59-62页

作者：武文忠王延超肖婷婷河南省人民医院(河南省立眼科医院)眼科郑州450000

目的探讨障眼明片治疗轻中度非增殖性糖尿病视网膜病变的疗效。方法选取2020年1月至2022年8月河南省人民医院(河南省立眼科医院)收治的86例非增殖性糖尿病视网膜病变患者作为研究对象,以抽签法分为对照组与观察组,每组43例。对照组予... 详细信息

目的探讨障眼明片治疗轻中度非增殖性糖尿病视网膜病变的疗效。方法选取2020年1月至2022年8月河南省人民医院(河南省立眼科医院)收治的86例非增殖性糖尿病视网膜病变患者作为研究对象,以抽签法分为对照组与观察组,每组43例。对照组予以胰激肽原酶肠溶片治疗,观察组在对照组基础上采用障眼明片进行治疗。比较两组中医证候积分、视力变化、眼部血流动力学、新生血管荧光素渗漏面积与生命质量。结果治疗后观察组中医证候积分、视力指标、新生血管荧光素渗漏面积低于对照组(P<0.05),视网膜血管血流动力学指标、生命质量评分高于对照组(P<0.05)。结论障眼明片能够减轻轻中度非增殖性糖尿病视网膜病变程度,改善眼底血管血液循环,提高视力与生命质量。

关键词：糖尿病视网膜病变非增殖期障眼明片

A new interacting capillary bundle model on the multiphase flow in micropores of tight rocks

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Petroleum Science 2024年第2期21卷 1099-1112页

作者： wen-Quan Deng Tian-Bo Liang wen-zhong Wang Hao Liu Jun-Lin wu Fu-Jian Zhou National Key Laboratory of Petroleum Resources and Engineering China University of Petroleum(Beijing)Beijing102249China

Surfactants are widely used in the fracturing fluid to enhance the imbibition and thus the oil recovery rate. However, current numerical models cannot capture the physics behind capillary imbibition during the wettability alteration by surfactants. Although the interacting capillary bundle(ICB) model shows potential in characterizing imbibition rates in different pores during wettability alteration, the existing ICB models neglect the influence of wettability and viscosity ratio on the imbibition behavior, making it difficult to accurately describe the oil-water imbibition behavior within the porous media. In this work,a new ICB mathematical model is established by introducing pressure balance without assuming the position of the leading front to comprehensively describe the imbibition behavior in a porous medium under different conditions, including gas-liquid spontaneous imbibition and oil-water *** the pore size distribution of a tight rock is known, this new model can predict the changes of water saturation during the displacement process in the tight rock, and also determine the imbibition rate in pores of different sizes. The water saturation profiles obtained from the new model are validated against the waterflooding simulation results from the CMG, while the imbibition rates calculated by the model are validated against the experimental observations of gas-liquid spontaneous imbibition. The good match above indicates the newly proposed model can show the water saturation profile at a macroscopic scale while capture the underlying physics of the multiphase flow in a porous medium at a microscopic scale. Simulation results obtained from this model indicate that both wettability and viscosity ratio can affect the sequence of fluid imbibition into pores of different sizes during the multiphase flow, where less-viscous wetting fluid is preferentially imbibed into larger pores while more-viscous wetting fluid tends to be imbibed into smaller pores. Fur

关键词： Imbibition Multiphase flow Tight rock Interacting capillary bundle model Wettability

Direct synthesis of α-hydroxyketone phosphates from terminal alkynes and H-phosphine oxides in the presence of PhI(OAc)2 and H2O

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Chinese Chemical Letters 2016年第11期27卷 1691-1695页

作者： Dong-Yan Hu Meng-Shun Li wen-wu zhong Jian-Xin Ji Jin Zhu Wei Wei Qiang Zhang Ming Cheng Chengdu Institute of Organic Chemistry Chinese Academy of Sciences Chengdu 610041 China Chengdu Institute of Biology Chinese Academy of Sciences Chengdu 610041 China University of the Chinese Academy of Sciences Beijing 100049 China School of Chemistry and Chemical Engineering Qufu Normal University Qufu 273165 China

A simple and highly efficient one-pot method for the construction of α-hydroxyketone phosphates from terminal alkynes and H-phosphine oxides has been developed in the presence of PhI（OAc）2 and H20. The present protocol provides an attractive approach to α-hydroxyketone phosphates in good to high yields, with the advantages of operation simplicity, the use of commercially available materials, broad substrate scope, high atom efficiency and good tolerance to scale-up synthesis.

关键词： α-Hydroxyketone phosphates Alkynes H-Phosphine oxides Water Phenyliodine diacetate

A mixed-coordination electron trapping-enabled high-precision touch-sensitive screen for wearable devices

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Bio-Design and Manufacturing 2024年第4期7卷 413-427页

作者： Xi Zhang Junchi Ma Hualin Deng Jinming zhong Kaichen Xu Qiang wu Bo wen Dongfeng Diao Guangdong Provincial Key Laboratory of Micro/Nano Optomechatronics Engineering College of Mechatronics and Control EngineeringShenzhen UniversityShenzhen 518060China State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical EngineeringZhejiang UniversityHangzhou 310058China Shenzhen University General Hospital Shenzhen 518055China Research Center of Medical Plasma Technology Shenzhen UniversityShenzhen 518060China

Touch-sensitive screens are crucial components of wearable *** such as reduced graphene oxide(rGO),carbon nanotubes(CNTs),and graphene offer promising solutions for flexible touch-sensitive ***,when stacked with flexible substrates to form multilayered capacitive touching sensors,these materials often suffer from substrate delamination in response to deformation;this is due to the materials having different Young’s modulus *** results in failure to offer accurate touch screen *** this work,we demonstrate an induced charge-based mutual capacitive touching sensor capable of high-precision touch *** is enabled by electron trapping and polarization effects related to mixed-coordinated bonding between copper nanoparticles and vertically grown graphene ***,we used an electron cyclotron resonance system to directly fabricate graphene-metal nanofilms(GMNFs)using carbon and copper,which are firmly adhered to flexible *** being subjected to 3000 bending actions,we observed almost no change in touch *** screen interaction system,which has a signal-to-noise ratio of 41.16 dB and resolution of 650 dpi,was tested using a handwritten Chinese character recognition trial and achieved an accuracy of 94.82%.Taken together,these results show the promise of touch-sensitive screens that use directly fabricated GMNFs for wearable devices.

关键词： Flexible touch-sensitive screen Graphene-metal nanofilms Mixed coordination Wearable device

Coercivity Ageing Effect on FePt Nanoparticles in Mesoporous Silica via Stepwise Synthesis Strategy

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Chinese Physics Letters 2018年第6期35卷 94-97页

作者： Tian-Le Wang Zhi-Gang Li Li Zhang Wei-Ping Chen Shang-Shen Feng wen-wu zhong College of Physics and Electronic Engineering Taizhou UniversityTaizhou 318000 Zhejiang Provincial Key Laboratory for Cutting Tools Taizhou UniversityTaizhou 318000

FePt nanoparticles in mesoporous silica are fabricated by a simple stepwise synthesis strategy.A pre-annealing temperature-dependent coercivity-ageing effect in FePt nanoparticles is observed at room *** facecentered cubic（fcc）structured FePt nanoparticles,the ageing effect is sensitive to the pre-annealing temperature,especially when the temperature is close to the *** special magnetic behavior of FePt nanoparticles reveals that the physical properties gradually change between fee and face-centered tetragonal structures,and will deepen our understanding of the mechanism of such magnetism in FePt nanoparticles.

关键词： Coercivity Ageing Effect on FePt Nanoparticles in Mesoporous Silica via Stepwise Synthesis Strategy

Smart Phones——A New Platform for Language Learning

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海外英语 2013年第1X期 73-74页

作者： wu wen-zhong WANG Na Hubei Normal University

Smart phones are a kind of phone installed with a corresponding open operating system that can make a phone work like a *** and more students are showing their dependence on *** on the smart phone platform,we can design many kinds of applicants for our phones that generate these suggestions,exploit a distant learning for M-learning on smart *** is a good way for people to learn a language and we should make good use of it.

关键词： Smart phone language learning exploitation

Recent advances and key perspectives of in-situ studies for oxygen evolution reaction in water electrolysis

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Green Energy & Environment 2024年第10期9卷 1497-1517页

作者： Yi Wang Zichen Xu Xianhong wu zhong-Shuai wu State Key Laboratory of Catalysis Dalian Institute of Chemical Physics Chinese Academy of Sciences University of Chinese Academy of Sciences Shijingshan District Dalian National Laboratory for Clean Energy Chinese Academy of Sciences

Electricity-driven water splitting to produce hydrogen is one of the most efficient ways to alleviate energy crisis and environmental pollution problems, in which the anodic oxygen evolution reaction(OER) is the key half-reaction of performance-limiting in water splitting. Given the complicated reaction process and surface reconstruction of the involved catalysts under actual working conditions, unraveling the real active sites, probing multiple reaction intermediates and clarifying catalytic pathways through in-situ characterization techniques and theoretical calculations are essential. In this review, we summarize the recent advancements in understanding the catalytic process, unlocking the water oxidation active phase and elucidating catalytic mechanism of water oxidation by various in-situ characterization techniques. Firstly, we introduce conventionally proposed traditional catalytic mechanisms and novel evolutionary mechanisms of OER, and highlight the significance of optimal catalytic pathways and intrinsic stability. Next, we provide a comprehensive overview of the fundamental working principles,different detection modes, applicable scenarios, and limitations associated with the in-situ characterization techniques. Further, we exemplified the in-situ studies and discussed phase transition detection, visualization of speciation evolution, electronic structure tracking, observation of reaction active intermediates, and monitoring of catalytic products, as well as establishing catalytic structure–activity relationships and catalytic mechanism. Finally, the key challenges and future perspectives for demystifying the water oxidation process are briefly proposed.

关键词： In-situ studies Water splitting Oxygen evolution reaction Catalytic mechanism