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Study on gob-side entry retaining in fully-mechanized longwall with top-coal caving and its application

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International Journal of Mining Science and Technology 2015年第3期25卷 503-510页

作者： Su Hai Bai Jianbiao Yan shuai Chen yong Zhang Zizheng School of Resources and Safety Engineering China University of Mining and Technology Yuwu Coal Co. Ltd Shanxi Lu’an Mining Group School of Mines China University of Mining and Technology State Key Laboratory of Coal Resources and Safe Mining China University of Mining and Technology

Based on the engineering background of gob-side entry retaining in fully-mechanized longwall with top coal caving(GER-FLTC) on N2105 working face of Yuwu coal mine, by adopting the methods of theoretical analysis and numerical calculation, the control techniques of surrounding rocks in GER-FLTC working face are studied in this paper. The two main difficulties of stability of surrounding rocks at gob-side retained entry in fully-mechanized longwall working face are the stability control of top coal and control of large deformation of GER-FLTC working face. Interaction mechanical model between roofing and roadside backfilling in GER-FLTC is established and the equations for the calculation of roof-cutting resistance of roadside backfilling are derived. Results of numerical calculation show that the damage zones of top coal can be categorized into the delaminating zone of top coal above the backfilling, tensile damage zone of top coal above the retained roadway and shear damage zone of the upper rib of the solid coal. Stability control of top coal is the critical part to success of GER-FLTC. With consideration of large deformation of surrounding rocks of gob-side retained entry in fully-mechanized longwall, the support technique of‘‘roofing control and wall strengthening'' is proposed where high strength and highly prestressed anchor rods and diagonal tensile anchor cables support are used for top coal, high strength and highly prestressed yielding anchor rod support is used for solid coal and roadside prestressed load-carrying backfilling is constructed by high-water material, in order to maintain the integrity of the top coal, transfer load, high resistance yielding load-carrying of solid coal, roof-cutting of roadside backfilling and support,and to achieve GER-FLTC. Results from this study are successfully applied in engineering practice.

关键词： Gob-side entry retaining in fully-mechanized longwan with top coal caving Stability control of top coalLarge deformation control Roofing control and wall strengthening

Mechanical Force Remodeling the Adult Brain

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Neuroscience Bulletin 2023年第5期39卷 877-879页

作者： Chen Zhang shuai Liu yong-Chun Yu Qingjian Han State Key Laboratory of Medical Neurobiology and MOE Frontiers Center for Brain Science Institutes of Brain ScienceFudan UniversityShanghai 200032China

The interactions between neural stem cells(NSCs)and their niche are essential for their maintenance,proliferation,differentiation,and migration,which contribute to brain plasticity,learning and memory,and cognition[1].As one of the key components of the NSC niche,astrocytes are vital in regulating the processes underlying brain development such as neuro-/gliogenesis,angiogenesis,axonal outgrowth,synaptogenesis,and synaptic pruning[2].Chemical and electrical signals mediated by adhesion molecules,the extracellular matrix,paracrine secretion.

关键词： vital maintenance migration

Synthesis of Dialkyl-substituted Terminal Olefin

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Chinese Chemical Letters 2005年第9期16卷 1213-1216页

作者： shen yong REN Bao Jian shen Qiao Xia GUO State Key Laboratory of Heavy Oil Processing The Key Laboratory of Catalysis of CNPC andFaculty of Chemical Science and Engineering China University of Petroleum Beijing 102249

Dialkyl-substituted terminal olefins were synthesized from the coupling reaction of a-olefins which were catalyzed by zirconocene dichloride/methylalumoxane （MAO） catalyst system under mild condition. High yield was gained and no other oligmer was detected. It was found that the ratio of AI/Zr is responsible for the selectivity of product.

关键词： Zirconocene dichloride methylalumoxane dialkyl-substituted terminal olefin coupling reaction

Stability prediction of underground entry-type excavations based on particle swarm optimization and gradient boosting decision tree

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Underground Space 2023年第2期9卷 234-249页

作者： Jian Zhou shuai Huang Ming Tao Manoj Khandelwal yong Dai Mingsheng Zhao School of Resources and Safety Engineering Central South UniversityChangsha 410083China Institute of Innovation Science and SustainabilityFederation University AustraliaBallaratVIC 3350Australia Poly Xinlian Blasting Engineer Limited Corp GuiyangGuizhou 550002China Re

The stability of underground entry-type excavations will directly affect the working environment and the safety of *** critical span graphs and traditional statistics learning methods can not meet the requirements of high accuracy for stability assessment of entry-type ***,this study proposes a new prediction method based on machine learning to scientifically adjust the critical span ***,the particle swarm optimization(PSO)algorithm is used to optimize the core parameters of the gradient boosting decision tree(GBDT),abbreviated as ***,the classification performance of eight other classifiers including GDBT,k-nearest neighbors(KNN),two kinds of support vector machines(SVM),Gaussian naive Bayes(GNB),logistic regression(LR)and linear discriminant analysis(LDA)are also applied to compare with the proposed *** revealed that compared with the other eight models,the prediction performance of PSO-GBDT is undoubtedly the most reliable,and its classification accuracy is up to ***,this model has great potential to provide a more scientific and accurate choice for the stability prediction of underground *** addition,each classification model is used to predict the stability category of several grid points divided by the critical span graph,and the updated critical span graph of each model is discussed in combination with previous *** results show that the PSO-GBDT model has the advantages of being scientific,accurate and efficient in updating the critical span graph,and its output decision boundary has strict theoretical support,which can help mine operators make favorable economic decisions.

关键词： Stability Entry-type excavations Critical span graph Gradient boosting decision tree Particle swarm optimization

High mass loading Ni_(4)Co_(1)-OH@CuO core-shell nanowire arrays obtained by electrochemical reconstruction for alkaline energy storage

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Nano Research 2022年第1期15卷 685-693页

作者： Yawei Yu Xiulan Hu shuai Wang Handan Qiao Zeyu Liu Kefan Song Xiaodong shen College of Materials Science and Engineering Nanjing Tech UniversityPuzhu South Road No.30Nanjing 211816China The Synergetic Innovation Center for Advanced Materials Nanjing Tech UniversityPuzhu South Road No.30Nanjing 211816China Jiangsu Collaborative Innovation Center for Advanced Inorganic Function Composites Nanjing Tech UniversityPuzhu South Road No.30Nanjing 211816China

The design of three-dimensional(30)core-shell hetercistructures is an efficient method to achieve high mass specific capacity of electroactive materials under high mass *** this work,porous Ni_(4)Co1-0H nanosheets with a mass loading of 7.7 mg·cm^(-2) are obtained by using Ni_(4)Cor(NO_(3))_(2)(0H)_(4) supported on the CuO nanowires as precursors via an unavoidable electrochemically induced phase *** the electrochemical reconstruction process,the N03-anions in Ni_(4)Cor(N0_(3))_(2)(0H)_(4) are easily replaced by OH-anions in the *** phase reconstruction is accompanied by the decrease of ionic diffusion.:resistance and the increase of pore volume,and the shift of binding *** obtained Ni4Co1-0H nanosheets show a high:mass specific capacity of 363.6 mAh·g^(-1) at 5 mA·cm^(-2).The as-fabricated alkaline hybrid supercapacitor and Ni-Zn battery deliver high energy density of 293.1 and 604.9 Wh·kg^(-1),respectively,*** alkaline energy storage performance.

关键词： electrochemical reconstruction core-shell heterostructure high mass loading alkaline hybrid supercapacitor Ni-Zn battery

Quantitative evaluation of extrinsic factors influencing electrical excitability in neuronal networks： Voltage Threshold Measurement Method(VTMM)

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Neural Regeneration Research 2018年第6期13卷 1026-1035页

作者： shuai An yong-Fang Zhao Xiao-Ying Lu Zhi-Gong Wang State Key Laboratory of Bioelectronics Southeast University Nanjing Jiangsu Province China Institute of RF- & OE-ICs Southeast University Nanjing Jiangsu Province China Co-innovation Center of Neuroregeneration Nantong University Nantong Jiangsu Province China

The electrical excitability of neural networks is influenced by different environmental factors. Effective and simple methods are required to objectively and quantitatively evaluate the influence of such factors, including variations in temperature and pharmaceutical dosage. The aim of this paper was to introduce ‘the voltage threshold measurement method＇, which is a new method using microelectrode arrays that can quantitatively evaluate the influence of different factors on the electrical excitability of neural networks. We sought to verify the feasibility and efficacy of the method by studying the effects of acetylcholine, ethanol, and temperature on hippocampal neuronal networks and hippocampal brain slices. First, we determined the voltage of the stimulation pulse signal that elicited action potentials in the two types of neural networks under normal conditions. Second, we obtained the voltage thresholds for the two types of neural networks under different concentrations of acetylcholine, ethanol, and different temperatures. Finally, we obtained the relationship between voltage threshold and the three influential factors. Our results indicated that the normal voltage thresholds of the hippocampal neuronal network and hippocampal slice preparation were 56 and 31 m V, respectively. The voltage thresholds of the two types of neural networks were inversely proportional to acetylcholine concentration, and had an exponential dependency on ethanol concentration. The curves of the voltage threshold and the temperature of the medium for the two types of neural networks were U-shaped. The hippocampal neuronal network and hippocampal slice preparations lost their excitability when the temperature of the medium decreased below 34 and 33°C or increased above 42 and 43°C, respectively. These results demonstrate that the voltage threshold measurement method is effective and simple for examining the performance/excitability of neuronal networks.

关键词： nerve regeneration threshold voltage microelectrode array electrical excitability of neural networks acetylcholine alcohol temperature hippocampal neuronal network hippocampal slice electrical stimulation action potentials neural regeneration

Exciting broadband thermochromic transmission property opposite to vanadium dioxide in the atmospheric window

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Science China(Technological Sciences) 2024年第7期67卷 2244-2254页

作者： GONG YiQuan GUO YanMing CHEN ShuNi LI Meng PAN QingHui shuai yong Ministry of Industry and Information Technology Key Laboratory of Aerospace Thermophysics School of Energy Science and EngineeringHarbin Institute of TechnologyHarbin 150001China

The traditional telecommunications band performs poorly in harsh weather conditions due to atmospheric absorption. In recent years, researchers have begun to study optical communication through atmospheric windows, and optical switches are an essential component of optical communication. A broadband atmospheric window optical switch was proposed based on Vanadium dioxide and magnetic polaritons(MP). It is formed by the stacking of two metal-dielectric-metal structures. The simulation results show that the modulation depth can reach 98.38%, and the extinction ratio is 17.93 dB. By calculating the magnetic field, we confirmed that the reason for the “off” mode is the coupling between the different MP modes, while the “on”mode is the excitation of MP. The optical switch we proposed may be applied to radiation cooling and optical satellite communication.

关键词： optical communication thermochromic property atmospheric window optical switch magnetic polariton

Putative Phosphatase UvPsr1 Is Required for Mycelial Growth, Conidiation, Stress Response and Pathogenicity in Ustilaginonidea virens

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Rice science 2020年第6期27卷 529-536页

作者： Xiong Meng Meng shuai Qiu Jiehua Shi Huanbin shen Xiangling Kou Yanjun Key Laboratory of Three Gorges Regional Plant Genetics&Germplasm Enhancement/Biotechnology Research Center China Three Gorges UniversityYichang 443000China State Key Laboratory of Rice Biology China National Rice Research InstituteHangzhou 310006China

Ustilaginoidea virens is the causal agent of rice false smut,which can be a highly destructive disease of *** plasma membrane phosphatase Psr1 proteins,which act as a regulator of the salinity stress response in yeast,are widely distributed across fungi,but their functional characterization is *** this study,we characterized the functions of Psr1 protein,UvPsr1,in *** of the AUvpsr1 and its complementation strain showed that UvPsr1 is required for normal mycelial growth,conidiation and tolerance to oxidative,osmotic and cell wall *** rice panicles were inoculated with the AUvpsr1 strains,no symptoms of false smut disease developed,showing that UvPSR1 also contributes to the pathogenicity of the *** deletion mutant of UvPSR1 also appeared to produce a smaller titer of toxic compounds able to inhibit elongation of the germinated *** conclusion,our results indicated that UvPsr1 is a new pathogenic factor of ***.

关键词： Psr1 rice false smut disease pathogenic factor clavicipitaceae Ustilaginoidea virens

Palladium/Xu-Phos-catalyzed enantioselective arylalkoxylation reaction ofγ-hydroxyalkenes at room temperature

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Chinese Chemical Letters 2024年第11期35卷 355-360页

作者： shuai Zhu Mingjie Chen Haichao shen Hanming Ding Wenbo Li Junliang Zhang State Key Laboratory of Petroleum Molecular&Process Engineering Shanghai Key Laboratory of Green Chemistry and Chemical ProcessesSchool of Chemistry and Molecular EngineeringEast China Normal UniversityShanghai 200062China School of Chemistry and Molecular Engineering East China Normal UniversityShanghai 200241China Department of Chemistry Fudan UniversityShanghai 200438China

Metal-catalyzed alkene arylalkoxylation is a powerful complexity-building strategy for the synthesis of oxygen heterocycles from simpleγ-unsaturated alcohols,but only a few examples of catalytic enantioselective methods ***,an efficient palladium-catalyzed enantioselective arylalkoxylation ofγ-hydroxyalkenes with aryl halides is *** salient features of this transformation include a remarkable broad substrate scope,mild reaction conditions,and good functional group tolerance,delivering a series of chiral tetrahydrofurans containing a tertiary or quaternary stereocenter in good yields with up to 95%*** Xu10 ligand with a suitable side-arm was responsible for the high reactivity and good enantioselectivity of this transformation.

关键词： Palladium-catalysis Xu-Phos Enantioselective Arylalkoxylation γ-Hydroxyalkenes