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Rock fracture mechanism of buffer blasting with cushion layer at the borehole bottom

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International Journal of Minerals,Metallurgy and Materials 2025年第2期32卷 325-334页

作者： Xinguang Zhu Chenxi Ding zhe sui Hong su Xu Guo School of Civil and Resources Engineering University of Science and Technology BeijingBeijing 100083China Key Laboratory for Mechanics in Fluid Solid Coupling Systems Institute of MechanicsChinese Academy of SciencesBeijing 100190China School of Mechanics and Civil Engineering China University of Mining and Technology(Beijing)Beijing 100083China School of Chemical and Blasting Engineering Anhui University of Science and TechnologyHuainan 232001China

This study primarily investigates the rock fracture mechanism of bottom cushion layer blasting and explores the effects of the bottom cushion layer on rock *** involves analyses of the evolution patterns of blasting stress,characteristics of crack distribution,and rock fracture features in the ***,blasting model experiments were carried out using the dynamic caustics principle to investigate the influence of bottom cushion layers and initiation methods on the integrity of the bottom rock *** experimental results indicate that the combined use of bottom cushion layers and inverse initiation effectively protects the integrity of the bottom rock ***,the process of stress wave propagation and dynamic crack propagation in rocks was simulated using the continuum-discontinuum element method(CDEM)and the Landau explosion source model,with varying thicknesses of bottom cushion *** numerical simulation results indicate that with increasing cushion thickness,the absorption of energy generated by the explosion becomes more pronounced,resulting in fewer cracks in the bottom rock *** illustrates the positive role of the cushion layer in protecting the integrity of the bottom rock mass.

关键词： bottom cushion layer blasting crack propagation continuum-discontinuum element method dynamic stress intensity factor

Effect of zinc supplementation on infants with severe pneumonia

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World Journal of Pediatrics 2016年第2期12卷 166-169页

作者： Xiao Yuan su-Yun Qian zheng Li zhe-zhe Zhang Pediatric Department of Beijing Friendship Hospital Capital Medical UniversityBeijingChina PICU Beijing Children's HospitalCapital Medical UniversityBeijingChina

Background:Pneumonia is a common respiratory infectious disease in *** work shows controversial results on the benefit of zinc supplementation in patients with *** conducted this study to investigate serum zinc status amongst infants with severe pneumonia and the clinical impact that zinc supplementation has on those patients with low serum zinc ***:This study design was a non-blinded prospective randomized controlled *** study is approved by the Ethics Committees of Beijing Children's Hospital.A total of 96 infants diagnosed with severe pneumonia and hospitalized in the pediatric intensive care unit between November 2011 and January 2012 were *** patients were divided into low serum zinc and normal serum zinc *** low serum zinc group was randomized into treatment and control *** the treatment group received zinc supplementation within 48-72 hours after ***:The prevalence of zinc defi ciency on admission was 76.0%.The low zinc level was most apparent in infants between 1 and 3 months of *** serum zinc level increased in the zinc treatment group and returned to a normal level(median,53.20μmol/L)on day 12±*** was no statistical difference in the pediatric critic illness score,lung injury score,length of hospital stay,and duration of mechanical ventilation between the zinc treatment group and control ***:Zinc deficiency is common in infants with severe *** of zinc levels with zinc supplementation did not improve clinical outcomes of infants with pneumonia.

关键词： infant pneumonia supplementation zinc

Research on adaptive dual task offloading decision algorithm for parking space recommendation service

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The Journal of China Universities of Posts and Telecommunications 2019年第6期26卷 30-42页

作者： Peng Weiping su zhe Song Cheng Jia Zongpu School of Computer Science and Technology Henan Polytechnic UniversityJiaozuo 454000China

In order to improve the efficiency of tasks processing and reduce the energy consumption of new energy vehicle(NEV), an adaptive dual task offloading decision-making scheme for Internet of vehicles is proposed based on information-assisted service of road side units(Rsus) and task offloading theory. Taking the roadside parking space recommendation service as the specific application Scenario, the task offloading model is built and a hierarchical self-organizing network model is constructed, which utilizes the computing power sharing among nodes, Rsus and mobile edge computing(MEC) servers. The task scheduling is performed through the adaptive task offloading decision algorithm, which helps to realize the available parking space recommendation service which is energy-saving and environmental-friendly. Compared with these traditional task offloading decisions, the proposed scheme takes less time and less energy in the whole process of tasks. Simulation results testified the effectiveness of the proposed scheme.

关键词： parking space recommendation service Internet of vehicles Rsu adaptive dual task offloading

Biodegradation of benzo[a]pyrene in soil by Mucor ***06 and Bacillus ***02 co-immobilized on vermiculite

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Journal of Environmental Sciences 2006年第6期18卷 1204-1209页

作者： su Dan LI Pei-jun FRANK Stagnitti XIONG Xian-zhe Institute of Applied Ecology Chinese Academy of Sciences Shenyang 110016 China Graduate University of Chinese Academy of Sciences Beijing 100049 China School of Life and Environmental Science Faculty of Science and Technology P. O Box 423 Warmambool Victoria 3280 Australia

Two indigenous microorganisms, Bacillus sp. SB02 and Mucor sp. SF06, capable of degrading polycyclic aromatic hydrocarbons （PAHs） were co-immobilized on vermiculite by physical adsorption and used to degrade benzo[a] pyrene （BaP）. The characteristics of BaP degradation by both free and co-immobilized microorganism were then investigated and compared. The removal rate using the immobilized bacterial-fungal mixed consortium was higher than that of the freely mobile mixed consortium. 95.3% of BaP was degraded using the co-immobilized system within 42 d, which was remarkably higher than the removal rate of that by the free strains. The optimal amount of inoculated co-immobilized system for BaP degradation was 2%. The immobilized bacterial-fungal mixed consortium also showed better water stability than the free strains. Kinetics of BaP biodegradation by co-immobilized SF06 and SB02 were also studied. The results demonstrated that BaP degradation could be well described by a zero-order reaction rate equation when the initial BaP concentration was in the range of 10--200 mg/kg. The scanning electronic microscope （SEM） analysis showed that the co-immobilized microstructure was suitable for the growth of SF06 and SB02. The mass transmission process of co-immobilized system in soil is discussed. The results demonstrate the potential for employing the bacterial-fungal mixed consortium, co-immobilized on vermiculite, for in situ bioremediation of BaP.

关键词： biodegradation Bacillus sp. SB02 Mucor sp. SF06 benzo[a]pyrene immobilization soil pollution

Study of ZrO_2 nanopowders based stearic acid phase change materials

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Particuology 2010年第4期8卷 394-397页

作者： Desheng Ai Lizan su zhe Gao ,Changsheng Deng Xiaming Dai Beijing Fine Ceramics Lab Institute of Nuclear and New Energy Technology Tsinghua University Haiclian District Beijing 100084 China School of Materials Sci. Er Eng. Seoul National University Seoul 151-742 Republic of Korea

ZrO2 nanopowders based stearic acid phase change materials （PCMS） were prepareo oy mgn-energy milling. The concept of heat capacity factor （HCF） was used to analyze the thermal properties of the materials. The heat storage property of PCMs, containing the same content of stearic acid （23~ by mass） in the starting materials but synthesized by different technical processes, was investigated by using HCE It was found that there were vast influences of different dispersants on the heat capacity. The samples orelaared with chloroform provided the best heat storage ability in all samples tested.

关键词： Heat capacity factor (HCF) High-energy millingPhase change materials (PCMs)

Effect of aberrometry in diagnosis of isolated spherophakia

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International Journal of Ophthalmology(English edition) 2022年第2期15卷 367-370页

作者： zhe Zhang su-Hua Zhang Shanxi Eye Hospital Taiyuan 030002Shanxi ProvinceChina

Dear Editor,We present two case reports about isolated spherophakia without systemic disorder and the essential role of ray tracing aberrometry in isolated spherophakia diagnosing.

关键词： isolated diagnosis of

Control Strategy of Wind Turbine Based on Permanent Magnet Synchronous Generator and Energy Storage for Stand-Alone Systems

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Chinese Journal of Electrical Engineering 2017年第1期3卷 51-62页

作者： Fujin Deng Dong Liu zhe Chen Peng su Department of Electrical Engineering Southeast UniversityNanjing210096China Department of Energy Technology Aalborg UniversityAalborg9220Denmark

This paper investigates a variable speed wind turbine based on permanent magnet synchronous generator and a full-scale power converter in a stand-alone *** energy storage system(ESS)including battery and fuel cell-electrolyzer combination is connected to the DC link of the full-scale power converter through the power electronics *** is the primary power source of the system,the battery and FC-electrolyzer combination is used as a backup and a long-term storage system to provide or absorb power in the stand-alone system,*** this paper,a control strategy is proposed for the operation of this variable speed wind turbine in a stand-alone system,where the generator-side converter and the ESS operate together to meet the demand of the *** control strategy is competent for supporting the variation of the loads or wind speed and limiting the DC-link voltage of the full-scale power converter in a small range.A simulation model of a variable speed wind turbine in a stand-alone system is developed using the simulation tool of PSCAD/*** dynamic performance of the stand-alone wind turbine system and the proposed control strategy is assessed and emphasized with the simulation results.

关键词： Variable speed wind turbine(VSWT) permanent magnet synchronous generator(PMSG) stand-alone system energy storage system(ESS).

Enterovirus D68 infection upregulates SOCS3 expression to inhibit JAK-STAT3 signaling and antagonize the innate interferon response of the host

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Virologica Sinica 2023年第5期38卷 755-766页

作者： Yuling Zhang Leling Xu zhe Zhang Xin su Zhiyun Wang Tao Wang School of Life Sciences Tianjin UniversityTianjin300072China School of Environmental Science and Engineering Tianjin UniversityTianjin300072China Institute of Tianjin Key Laboratory of Function and Application of Biological Macromolecular Structures Tianjin300072China

Enterovirus D68(EV-D68)can cause respiratory diseases and acute flaccid paralysis,posing a great threat to public *** are cytokines secreted by host cells that have broad-spectrum antiviral effects,inducing the expression of hundreds of interferon-stimulated genes(ISGs).EV-D68 activates ISG expression early in infection,but at a later stage,the virus suppresses ISG expression,a strategy evolved by EV-D68 to antagonize ***,we explore a host protein,suppressor of cytokine signaling 3(SOCS3),is upregulated during EV-D68 infection and antagonizes the antiviral effects of type I *** subsequently demonstrate that the structural protein of EV-D68 upregulated the expression of RFX7,a transcriptional regulator of SOCS3,leading to the upregulation of SOCS3 *** exploration revealed that SOCS3 plays its role by inhibiting the phosphorylation of signal transducer and activator of transcription 3(STAT3).The expression of SOCS3 inhibited the expression of ISG,thereby inhibiting the antiviral effect of type I interferon and promoting EV-D68 transcription,protein production,and viral ***,a truncated SOCS3,generated by deleting the kinase inhibitory region(KIR)domain,failed to promote replication and translation of *** on the above studies,we designed a short peptide named SOCS3 inhibitor,which can specifically bind and inhibit the KIR structural domain of SOCS3,significantly reducing the RNA and protein levels of *** summary,our results demonstrated a novel mechanism by which EV-D68 inhibits ISG transcription and antagonizes the antiviral responses of host type I interferon.

关键词： Enterovirus D68(EV-D68) Interferon ISG SOCS3 STAT3

An ion-released MgI_(2)-doped separator inducing a LiI-containing solid electrolyte interphase for dendrite-free Li metal anodes

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Journal of Energy Chemistry 2022年第12期75卷 83-94,I0003页

作者： Shan Yi zhe su Wanyu Zhang Hongli Chen Yayun Zhang Bo Niu Donghui Long State Key Laboratory of Chemical Engineering East China University of Science and TechnologyShanghai 200237China Key Laboratory for Specially Functional Materials and Related Technology of the Ministry of Education East China University of Science and TechnologyShanghai 200237China

Lithium metal batteries are among the strong contenders to satisfy the ever-increasing needs of energy storage systems,which however suffer from poor composition of the solid electrolyte interphase(SEI)layer and uncontrolled Li dendrites *** this regard,we report on the design of an ionreleased MgI_(2)-doped polyacrylonitrile(PAN)based nanofiber(MPANF)separator,which can lead to conducive SEI layer and dendrite-free Li *** combination of the lithophilic MgI_(2)nanoparticles with polarized PAN matrix comprehensively functions as a high-compatible interpenetrating network to homogenize ionic transportation and confront dendrite *** released I ions introduce the highion-conductivity LiI into SEI layer,which could induce the formation of favorable and protective interface layer in the early stage,as embodied in the enrichment of advantageous components such as LiN_(x)O_(y),Li_(2)O,LiF,and Li_(3)*** from the high-affinity MPANF separator,the Li||Li symmetric cell achieves an ultralow voltage hysteresis of 46 mV with an extended lifespan of 580 *** a prolonged lifetime of 590cycles with an enhanced specific capacity of 140.1 m Ah g^(-1)and the Coulombic efficiency of 96.2%at 1C can be obtained in full *** work may offer a facile and high-affinity alternative to traditional polymeric separators for high-performance and dendrite-free Li metal batteries.

关键词： Lithium metal anode LiI-containing layer Dendrite-free anode Electrospun nanofiber separator