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Influence of Dowel Center Spacing on Chamfered-Joint Components Made byCupressus funebris Wood

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Journal of Renewable Materials 2023年第1期11卷 309-319页

作者： Jianhua Lyu Jialei Wang ziqiang chen Ming chen College of Forestry Sichuan Agricultural UniversityChengdu611130China Wood Industry and Furniture Engineering Key Laboratory of Sichuan Provincial Department of Education Chengdu611130China Sichuan Provincial Forestry Survey Design and Research InstituteChengdu610084China

The traditional tenon and mortise joint has low processing efficiency and a weak theoretical basis,making the structure easy to deform and damage,reducing the safety,and increasing waste of *** study aims to determine the optimum dowel center spacing parameter for chamfered-joint components and the maximum value of the strength of joints loaded into bending strength and tensile *** this study,an integrated opti-mization method combining the single-factor test and one-way ANOVA analysis was proposed to study the influ-ence of the dowel center spacing on the bending strength and the tensile strength of chamfered-joint components made by Cupressus funebris *** results revealed that the bending strength of chamfered-joint components decreases linearly with the increase of the dowel center *** addition,the tensile strength of chamfered-joint components increases first and then decreases with the increase of the dowel center spacing,showing para-bola *** relational expression between dowel center spacing,the bending strength,dowel center spacing and the tensile strength were obtained.

关键词： Dowel center spacing chamfered-joint bending strength tensile strength Cupressus funebris wood

G protein-coupled receptors(GPCRs):advances in structures,mechanisms,and drug discovery

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Signal Transduction and Targeted Therapy 2024年第5期9卷 1938-1980页

作者： Mingyang Zhang Ting chen Xun Lu Xiaobing Lan ziqiang chen Shaoyong Lu Key Laboratory of Protection Development and Utilization of Medicinal Resources in Liupanshan AreaMinistry of EducationPeptide&Protein Drug Research CenterSchool of PharmacyNingxia Medical UniversityYinchuan 750004China Medicinal Chemistry and Bioinformatics Center Shanghai Jiao Tong University School of MedicineShanghai 200025China Department of Cardiology Changzheng HospitalAffiliated to Naval Medical UniversityShanghai 200003China Department of Orthopedics Changhai HospitalAffiliated to Naval Medical UniversityShanghai 200433China

G protein-coupled receptors(GPCRs),the largest family of human membrane proteins and an important class of drug targets,play a role in maintaining numerous physiological *** or antagonist,orthosteric effects or allosteric effects,and biased signaling or balanced signaling,characterize the complexity of GPCR dynamic *** this study,we first review the structural advancements,activation mechanisms,and functional diversity of *** then focus on GPCR drug discovery by revealing the detailed drug-target interactions and the underlying mechanisms of orthosteric drugs approved by the US Food and Drug Administration in the past five ***,an up-to-date analysis is performed on available GPCR structures complexed with synthetic small-molecule allosteric modulators to elucidate key receptor-ligand interactions and allosteric ***,we highlight how the widespread GPCR-druggable allosteric sites can guide structure-or mechanism-based drug design and propose prospects of designing bitopic ligands for the future therapeutic potential of targeting this receptor family.

关键词： steric designing mechanisms

A Pricing-Based Cooperative Relay Selection Scheme for Reliable Communications

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China Communications 2024年第8期21卷 30-44页

作者： Xiao Yulong Wu Yu Amr Tolba chen ziqiang Li Tengfei School of Communications and Information Engineering Chongqing University of Posts and TelecommunicationsChongqing 400065China School of Cyber Security and Information Law Chongqing University of Posts and TelecommunicationsChongqing 400065China Department of Computer Science Community CollegeKing Saud UniversityRiyadh 11437Saudi Arabia

With the rapid development and application of energy harvesting technology,it has become a prominent research area due to its significant benefits in terms of green environmental protection,convenience,and high safety and ***,the uneven energy collection and consumption among IoT devices at varying distances may lead to resource imbalance within energy harvesting networks,thereby resulting in low energy transmission *** enhance the energy transmission efficiency of IoT devices in energy harvesting,this paper focuses on the utilization of collaborative communication,along with pricing-based incentive mechanisms and auction *** propose a dynamic relay selection scheme,including a ladder pricing mechanism based on energy level and a Kuhn-Munkre Algorithm based on an auction theory employing a negotiation mechanism,to encourage more IoT devices to participate in the collaboration *** results demonstrate that the proposed algorithm outperforms traditional algorithms in terms of improving the energy efficiency of the system.

关键词： cooperative communication edge net-work energy harvesting relay selection

Design and characterization of metallic glass/graphene multilayer with excellent nanowear properties

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Friction 2022年第11期10卷 1913-1926页

作者： Qing ZHOU Dawei LUO Dongpeng HUA Wenting YE Shuo LI Qiguang ZOU ziqiang chen Haifeng WANG State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal MaterialsNorthwestern Polytechnical UniversityXi’an 710072China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

The excellent properties of metallic glass(MG)films make them perfect candidates for the use in miniature systems and ***,their high coefficients of friction(COFs)and poor wear resistance considerably limit their long-term performance in nanoscale *** report the fabrication of a MG/graphene multilayer by the repeated deposition of Cu_(50)Zr_(50) MG with alternating layers of *** microstructure of the multilayer was characterized by the transmission electron microscopy(TEM).Its mechanical and nanotribological properties were studied by nanoindentation and nanoscratch tests,respectively.A molecular dynamics(MD)simulation revealed that the addition of graphene endowed the MG with superelastic recovery,which reduced friction during *** comparison with the monolithic MG film,the multilayer exhibited improved wear resistance and a low COF in repeated nanowear tests owing to the enhanced mechanical properties and lubricating effect caused by the graphene *** work is expected to motivate the design of other novel MG films with excellent nanowear properties for engineering applications.

关键词： metallic glass(MG) multilayer nanowear properties molecular dynamics(MD)simulation

Flexible and ultrathin dopamine modified MXene and cellulose nanofiber composite films with alternating multilayer structure for superior electromagnetic interference shielding performance

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Frontiers of physics 2023年第3期18卷 155-166页

作者： Qiugang Liao Hao Liu ziqiang chen Yinggan Zhang Rui Xiong Zhou Cui Cuilian Wen Baisheng Sa Multiscale Computational Materials Facility and Key Laboratory of Eco-materials Advanced TechnologyCollege of Materials Science and EngineeringFuzhou UniversityFuzhou 350100China College of Materials Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryXiamen UniversityXiamen 361005China

With the development of modern electronics,especially the next generation of wearable electromagnetic interference(EMI)shielding materials requires flexibility,ultrathin,lightweight and robustness to protect electronic devices from radiation *** this work,the flexible and ultrathin dopamine modified MXene@cellulose nanofiber(DM@CNF)composite films with alternate multilayer structure have been developed by a facile vacuum filtration induced self-assembly *** multilayered DM@CNF composite films exhibit improved mechanical properties compared with the homogeneous DM/CNF *** adjusting the layer number,the multilayered DM3@CNF2 composite film exhibits a tensile strength of 48.14 MPa and a toughness of 5.28 MJ·m^(–3) with a thickness about 19μ*** that,the DM@CNF film with annealing treatment achieves significant improvement in conductivity(up to 17264 S·m^(–1))and EMI properties(SE of 41.90 dB and SSE/t of 10169 dB·cm^(2)·g–1),which still maintains relatively high mechanical *** is highlighted that the ultrathin multilayered DM@CNF film exhibits superior EMI shielding performance compared with most of the metal-based,carbon-based and MXene-based shielding materials reported in the *** results will offer an appealing strategy to develop the ultrathin and flexible MXene-based materials with excellent EMI shielding performance for the next generation intelligent protection devices.

关键词： MXene dopamine cellulose nanofibers electromagnetic interference shielding performance mechanical properties

Rice sl-MH-1 mutant induces cell death and confers blast resistance via the synergistic roles of signaling systems

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The Crop Journal 2022年第6期10卷 1755-1766页

作者： Dagang Tian Yan Lin Shengping Li Yiyang Cao Gang Li Xinrui Guo ziqiang chen Zaijie chen Feng Wang Zonghua Wang Fujian Key Laboratory of Genetic Engineering for Agriculture Biotechnology Research InstituteFujian Academy of Agricultural SciencesFuzhou 350003FujianChina State Key Laboratory of Ecological Control of Fujian-Taiwan Crop Pests Key Laboratory of Ministry of Education for GeneticsBreeding and Multiple Utilization of CropsPlant Immunity CenterFujian Agriculture and Forestry UniversityFuzhou 350003FujianChina

Serotonin is ubiquitous across all forms of life and functions in responses to biotic and abiotic *** rice,the conversion of tryptamine to serotonin is catalyzed by Sekiguchi lesion(SL).Previous studies have identified an sl mutation(a null mutation of SL)in several rice varieties and confirmed its increase of resistance and cell ***,a systematic understanding of the reprogrammed cellular processes causing cell death and resistance is *** performed a multi-omics analysis to clarify the fundamental mechanisms at the protein,gene transcript,and metabolite *** found that cell death and Magnaporthe oryzae(***)infection of the sl-MH-1 mutant activated plant hormone signal transduction involving salicylic acid(SA),jasmonic acid(JA),and abscisic acid(ABA)in multiple regulatory *** characterized the dynamic changes of several key hormone levels during disease progression and under the cell death conditions and showed that SA and JA positively regulated rice cell death and disease ***-overexpressing lines confirmed that the sl-MH-1 mutant positively regulated rice resistance to *** studies shed light on cell death and facilitate further mechanistic dissection of programmed cell death in rice.

关键词： Sekiguchi lesion Cell death Phytohormone M.oryzae Rice

Enhancing hydrogen evolution reaction performance of transition metal doped two-dimensional electride Ca_(2)N

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Chinese Chemical Letters 2023年第6期34卷 487-491页

作者： Baoyu Liu ziqiang chen Rui Xiong Xuhui Yang Yinggan Zhang Teng Xie Cuilian Wen Baisheng Sa Multiscale Computational Materials Facility and Key Laboratory of Eco-materials Advanced TechnologyCollege of Materials Science and EngineeringFuzhou UniversityFuzhou 350100China College of Environmental Science and Engineering Fujian Key Laboratory of Pollution Control&Resource ReuseFujian Normal UniversityFuzhou 350007China College of Materials Fujian Provincial Key Laboratory of Theoretical and Computational ChemistryXiamen UniversityXiamen 361005China

Two-dimensional electride Ca_(2)N has strong electron transfer ability and low work function,which is a potential candidate for hydrogen evolution reaction(HER)*** this work,based on density functional theory calculations,we adopt two strategies to improve the HER catalytic activity of Ca_(2)N monolayer:introducing Ca or N vacancy and doping transition metal atoms(TM,refers to Ti,V,Cr,Mn,Fe,Zr,Nb,Mo,Ru,Hf,Ta and W).Interestingly,the Gibbs free energyΔG_(H*)of Ca_(2)N monolayer after introducing N vacancy is reduced to-0.146 e V,showing good HER catalytic *** is highlighted that,the HER catalytic activity of Ca_(2)N monolayer can be further enhanced with TM doping,the Gibbs free energyΔG_(H*)of single Mo and double Mn doped Ca_(2)N are predicted to be 0.119 and 0.139 e V,*** present results will provide good theoretical guidance for the HER catalysis applications of two-dimensional electride Ca_(2)N monolayer.

关键词： Two-dimensional electride Ca_(2)N Density functional theory calculations Hydrogen evolution reaction Transition metal doping

Characteristics of sulfate in atmosphere over Xiamen waters and its fluxes to waters

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Acta Oceanologica Sinica 1993年第4期12卷 585-595页

作者： Huang ziqiang, Zhang Yuanhui and chen Liqi Third Institute of Oceanography, State Oceanic Administration, Xiamen 361005, China

One hundred and seven marine aerosol samples were collected during December 1988 to March 1990, and 3 dry deposition samples, 16 rain samples and 2 Cascade Impacter samples were collected from March to May 1990 at the southeast coast of the Xiamen Island. All the samples were analyzed for SO42-, NO3-, Cl-, Na+ , NH4+, using ion *** results indicate that the concentration of sulfate in marine aerosols over the Xiamen waters appears to be of seasonal variation, in an order of winter > spring > autumn > summer. The mean sulfate concentration lor the total marine aerosol samples over the Xiamen waters is 9. 37 μg/m3, respectively 0. 89 and 8. 48 μg/m3 for the seasalt and non-sea-salt sulfate. The distribution of sulfate shows a bimodal form with a peak in the coarse particle range which is derived from the sea-salt sulfate, and a peak in the fine particle range which is derived from the non-sea-salt sulfate. The total deposition of sulfate to the Xiamen waters is estimated to be 4. 68g/m2 · a, with dry and wet depositions being approximately 2.19 and 2. 49g/m2 · a respectively.

关键词： Sulfate marine aerosol Xiamen waters

iTRAQ-based protein profiling and functional identification of four genes involved in rice basal resistance against Magnaporthe oryzae in two contrasting rice genotypes

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Stress Biology 2023年第1期3卷 428-436页

作者： chenchen Li ziqiang chen Yun Deng Shuyu Jiang Yan Su Shaohua Yang Yan Lin Dagang Tian Biotechnology Research Institute Fujian Academy of Agricultural SciencesFuzhou 350003FujianChina College of Agriculture College of Life ScienceFujian Agricultural and Forestry UniversityFuzhou 350002China Nanping Institute of Agricultural Sciences FujianChina.

Rice blast,caused by Magnaporthe oryzae,is one of the most destructive rice *** blast-resistant rice cultivars represents the most economical and environmentally friend strategy for managing the *** our previous study,an isobaric tags for relative and absolute quantitation(iTRAQ)-based comparative protein quantification was carried out to investigate the resistance gene Piz-t gene-mediated resistance response to infection in two contrasting rice genotypes of the Piz-t transgenic Nipponbare line(NPB-Piz-t)and its wild-type Nipponbare(NPB).Here,from the comparisons of differentially expressed proteins(DEPs)of NPB-Piz-t to the avirulent isolate KJ201(KJ201-Piz-t)and the virulent isolate RB22(RB22-Piz-t)with mock-treated NPB-Piz-t(Mock-Piz-t),NPB to the virulent isolate KJ201(KJ201-NPB)and RB22(RB22-NPB)with mock-treated NPB(Mock-NPB),1,1,and 6 common DEPs were,respectively,identified at 24,48 and 72 h post-inoculation(hpi)in the susceptible comparisons of RB22-Pizt/Mock-Piz-t,KJ201-NPB/Mock-NPB,and RB22-NPB/Mock-NPB,involving in gi|54,290,836 and gi|59,800,021 were identified in the resistance comparison KJ201-Piz-t/Mock-Piz-t at 48 and 72 hpi ***,four genes of Os01g0138900(gi|54,290,836),Os04g0659300(gi|59,800,021),Os09g0315700(gi|125,563,186)or Os04g0394200(gi|21,740,743)were knocked out or overexpressed in NPB using gene over-expression and CRISPR/Cas9 technology,and results verified that the Os01g0138900 obviously affected the rice blast ***,expression and targeted metabolomics analysis illuminated the resistance response of cysteine-containing substances as gi|59,800,021 under blast *** results provide new targets for basal resistance gene identification and open avenues for developing novel rice blast resistant materials.

关键词： Rice iTRAQ CRISPR/Cas9 Rice blast Basal resistance gene