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Positive periodic solutions of higher-dimensional nonlinear functional difference equations

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Journal of Central South University of Technology 2005年第Z1期12卷 274-277页

作者： DAI Bin-xiang ZOU jie-zhong ZHANG Na School of Mathematical Science and Computing Technology Central South University Changsha 410075 China School of Mathematical Science and Computing Technology Central South University Changsha 410075 China College of Mathematics and Econometrics Hunan University Changsha 410082 China

In this paper, we apply a cone theoretic fixed point theorem to obtain sufficient conditions for the existence of multiple positive periodic solutions to the higher-dimensional functional difference equations of the f... 详细信息

关键词： positive periodic solution difference equations cone fixed point theorem

阿南德氏链霉菌FXJ-25的鉴定及对烟草靶斑病的防效

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中国烟草科学 2024年第2期45卷 56-63页

作者：苏家恩杨志娟董天学赵英佑王显跃费明亮陈颐钟杰云南省烟草公司大理市公司云南大理671000 云南省烟草公司曲靖市公司云南曲靖655000 云南省烟草农业科学研究院昆明650031 湖南农业大学植物保护学院长沙410128

为筛选烟草靶斑病菌拮抗菌,丰富烟草靶斑病生防资源,采用稀释涂布法和平板对峙法进行放线菌分离,筛选得到一株具有明显拮抗效果的菌株FXJ-25。基于培养特性、生理生化特性及16S rDNA基因序列分析相结合的方法对该菌株进行鉴定,分析了其... 详细信息

为筛选烟草靶斑病菌拮抗菌,丰富烟草靶斑病生防资源,采用稀释涂布法和平板对峙法进行放线菌分离,筛选得到一株具有明显拮抗效果的菌株FXJ-25。基于培养特性、生理生化特性及16S rDNA基因序列分析相结合的方法对该菌株进行鉴定,分析了其诱导烟草抗性的能力,并通过盆栽试验对其防效进行了研究。结果表明,拮抗菌FXJ-25对烟草靶斑病菌的抑菌率为74.14%,可引起菌丝畸形,经鉴定该菌株为阿南德氏链霉菌(Streptomyces anandii)。FXJ-25具有广谱抗真菌活性,对瓜类蔓枯病菌(Stagonosporopsis cucurbitacearum)、烟草喀斯特炭疽菌(Colletotrichum karstii)和小麦赤霉病菌(Fusarium graminearum)等15种植物病原真菌均具有较好的拮抗作用,抑菌率在53.43%~100%之间。菌株发酵液还可显著提高烟苗苯丙氨酸解氨酶(PAL)、过氧化物酶(POD)、多酚氧化酶(PPO)和过氧化氢酶(CAT)等防御相关酶的活性。盆栽防效中,菌株FXJ-25活菌液(108孢子/mL)对烟草靶斑病具有78.81%的防效。因此,FXJ-25可作为烟草靶斑病的生防材料进一步开发利用。

关键词：阿南德氏链霉菌生物防治烟草靶斑病抑菌谱

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Mg-doped,carbon-coated,and prelithiated SiO_(x) as anode materials with improved initial Coulombic efficiency for lithium-ion batteries

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Carbon Energy 2024年第3期6卷 204-214页

作者： Bin Liu jie Liu Cheng zhong Wenbin Hu Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education) School of Materials Science and EngineeringTianjin UniversityTianjinChina Tianjin Key Laboratory of Composite and Functional Materials School of Materials Science and EngineeringTianjin UniversityTianjinChina Joint School of National University of Singapore and Tianjin University TianjinChina International Campus of Tianjin University Binhai New CityFuzhouChina

Silicon suboxide(SiO_(x),x≈1)is promising in serving as an anode material for lithium-ion batteries with high capacity,but it has a low initial Coulombic efficiency(ICE)due to the irreversible formation of lithium silicates during the first *** this work,we modify SiO_(x) by solid-phase Mg doping reaction using low-cost Mg powder as a reducing *** show that Mg reduces SiO_(2) in SiO_(x) to Si and forms MgSiO_(3) or Mg_(2)SiO_(4).The MgSiO_(3) or Mg_(2)SiO_(4) are mainly distributed on the surface of SiO_(x),which suppresses the irreversible lithium-ion loss and enhances the ICE of SiO_(x).However,the formation of MgSiO_(3) or Mg_(2)SiO_(4) also sacrifices the capacity of SiO_(x).Therefore,by controlling the reaction process between Mg and SiO_(x),we can tune the phase composition,proportion,and morphology of the Mg-doped SiO_(x) and manipulate the *** obtain samples with a capacity of 1226 mAh g^(–1) and an ICE of 84.12%,which show significant improvement over carbon-coated SiO_(x) without Mg *** the synergistical modification of both Mg doping and prelithiation,the capacity of SiO_(x) is further increased to 1477 mAh g^(–1) with a minimal compromise in the ICE(83.77%).

关键词： initial Coulombic efficiency lithium-ion batteries magnesium doping prelithiation silicon suboxide

Construction of digital 3D magic-cube organization structure for innovation-driven manufacturing

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工程管理前沿:英文版 2023年第3期10卷 373-390页

作者： Qiao XIANG You ZHANG jie zhong Guoxuan WANG Lirong LONG Aero Engine Corporation of China(AECC) Beijing 100097China Chengdu Holy Industry&Commerce Corp. Ltd.(Group)Pengzhou 611936China School of Management Huazhong University of Science and TechnologyWuhan 430074China

Owing to the heterogeneity between functional units and resource scarcity,manufacturing firms have been struggling with intra-organizational coordination for productivity and *** organizational structures,such as linear-functional and matrix,may cause responsibility division and independent goals(Shahani,2020),and are more difficult to be adopted by large-sized innovative manufacturing firms for quantity *** is based on a review of several new forms of organization(i.e.,network organization,multiteam system,and platform organization)compared with the traditional forms of organization(i.e.,linear,matrix,and business unit organization,among others).This study proposes a three-dimensional(3D)magic-cube organizational structure,considering the product dimensions,business,and ***,the characteristics,propositions of system operation,system dynamic model,and working model of the 3D magic-cube organization are ***,the 3D model is applied in a Chinese manufacturing firm to test its *** redesigning the post and pay system,the pilot organization establishes a project-driven and cross-functional coordination mechanism,positively affecting the firm’s financial profit,output value,labor productivity,and income of per *** proposed 3D model can be adopted by large-or medium-sized manufacturing firms for product development and *** implications of both practice and theory are also discussed in this study.

关键词： innovation manufacturing 3D magic-cube organization structure coordination

EXPERIMENTAL RESEARCH ON THE SHAPE CHARACTERS OF NATURAL AND VENTILATED SUPERCAVITATION

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Journal of Hydrodynamics 2007年第5期19卷 564-571页

作者： ZHANG Xue-wei WEI Ying-jie ZHANG Jia-zhong WANG Cong YU Kai-ping School of Astronautics Harbin Institute of Technology Harbin 150001 China

A series of projectile and water-tunnel experiments were conducted to investigate the shape characters of natural and ventilated supercavitation. It was found that the shape and dimensions of both the natural supercavitation and the ventilated supercavitation are similar through the comparison of them when the cavitation number is small and equal, and the contour of both the natural supercavitation and the ventilated supercavitation can be calculated effectively with the Savchenko formula. The gravity effect can induce the asymmetry of ventilated supercavitation, and the asymmetry is more apparent as the Froude number is smaller. The empirical formula for calculating the axial deformation of ventilated supercavitation was corrected and expanded based on experiment data. The evolution rules of both the natural supercavitation and the ventilated supercavitation were described, and the vortex frequency of natural cavitation was obtained. In addition, the hysteretic aspect was observed between the development and the fall process of ventilated cavitation.

关键词： natural cavitation ventilated cavitation shapecharacters water tunnel experiment projectile experiment

Liquidus Temperatures of System Na_3AlF_6-K_3AlF_6-AlF_3 for Aluminum Electrolysis at Lower Temperature

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Chemical Research in Chinese Universities 2011年第6期27卷 1019-1022页

作者： WEI Chen-juan LAI Yan-qing LI jie TIAN zhong-liang WANG Jia-wei ZOU zhong LIU Ye-xiang School of Metallurgical Science and Engineering Central South University Changsha 410083 P. R. China

Liquidus temperatures in the molten salt system Na3AlF6-K3AlF6-AlF3 of interest for aluminum electrolysis were determined by thermal analysis method. The results were presented and an empirical equation describing liquidus temperatures for primary crystallization was derived t=1003.5–0.081×A2.3159–5.87×B0.657–0.024×A2.22×B1.14＋ 0.035×A2.17×B1.084, where t is the liquidus temperature in degree Celsius, A denotes the mass fraction of AlF3 in system Na3AlF6-K3AlF6- AlF3, and B denotes K3AlF6/（Na3AlF6＋K3AlF6 ） in mass（%, the value was defined as KR in this paper）. The composition limitations are 0w（AlF3）30%, and 0KR50%. The isothermal diagram of molten salt system Na3AlF6-K3AlF6-AlF3 was obtained in this composition limitation.

关键词： Liquidus temperature Na3AlF6-K3AlF6-AlF3 system Empirical equation

Meta-analysis of the success rate of heartbeat recovery in patients with prehospital cardiac arrest in the past 40 years in China

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Military Medical Research 2020年第4期7卷 430-443页

作者： Xiang-Min Gu Shi-Bin Yao zhong-jie He Yong-Gang Wang Zhi-Hui Li Tianjin Binhai New Area Center for Disease Control and Prevention Tianjin 300450China Emergency Department Affiliated Hospital of Chifeng CollegeChifeng 024005Inner MongoliaChina The Fourth Medical Center of Chinese PLA General Hospital Beijing 100048China Beijing Platinum Ten Minutes Time-effect Emergency Technology Research Academy Beijing 100039China Beijing Chaoyang District Jiangtai Community Health Service Center Beijing 100016China

Background:Systematic evaluation of the successful heartbeat recovery rate(HRR)in patients during the platinum ten minutes after cardiac ***:The databases of CNKI(January 1979–March 2019),Chongqing VIP(January 1989–March 2019),Wanfang(January 1990–March 2019)and Web of Science(January 1900-May 2020)were *** collect the clinical data of patients with cardiac arrest before hospitalization and analyze the cardiopulmonary resuscitation(CPR)at different *** selection and data extraction were carried out by two researchers independently,and the meta package of R software(version 3.61)was used for ***:A total of 116 papers met the inclusion criteria,including 37,181 *** these patients,3367 had their heartbeats successfully *** results showed a high degree of heterogeneity(χ2=6999.21,P15 min *** HRR were 0.417(0.341–0.496),0.143(0.104–0.193),0.049(0.034–0.069),and 0.022(0.009–0.051),*** HRR was higher in the 0 to≤5 min group than in the 5 to≤10 min group,the 10 to≤15 min group and the>15 min *** was no difference between the 10 to≤15 min group and the>15 min group.(3)When the groups were stratified with the cutoff of 10 min,the≤10 min group HRR[0.250(0.202–0.306)]was higher than the>10 min group rate[0.041(0.029–0.057)].(4)The HRR of the telephone guidance group was[0.273(0.227–0.325)]lower than that of the 0 to≤5 min group[0.429(0.347–0.516)]but higher than that of the 5 to≤10 min group,the 1

关键词： Sudden cardiac arrest Cardiopulmonary resuscitation Peri-cardiac arrest period Platinum 10 min Meta-analysis

Effects of low-frequency electromagnetic field on the surface quality of 7050 aluminum alloy ingots during the hot-top casting process

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International Journal of Minerals,Metallurgy and Materials 2011年第2期18卷 165-168页

作者： Xiang-jie Wang Jian-zhong Cui Yu-bo Zuo Zhi-hao Zhao Hai-tao Zhang Key Lab of Electromagnetic Processing of Materials （Ministry of Education） Northeastern University Shenyang 110004 China

To improve the quality of 7050 aluminum alloy ingots, low-frequency electromagnetic （LFE） field was applied during the conventional hot-top casting process. Macrostructures and microstructures of the ingots by the conventional and LFE hot-top casting processes were studied. The experimental results show that when the LFE field is turn off during the hot-top casting process, cold folding appears, and the as-cast structure becomes very coarse. Additionally, the thickness of the shell zone is much thinner during the low-frequency electromagnetic hot-top casting process than that during the conventional hot-top casting process. Some reasons for low-frequency electromagnetic field improving the surface quality, refining the structure of the ingot, and minimizing the thickness of the shell zone have been studied.

关键词： aluminum alloys solidification surface quality electromagnetic field

Proboscipedia and Sex combs reduced are essential for embryonic labial palpus specification in Bombyx mori

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Journal of Integrative Agriculture 2020年第6期19卷 1482-1491页

作者： ZHANG Ru ZHANG zhong-jie YU Ye HUANG Yong-ping QIAN Ai-rong TAN An-jiang Faculty of Life Sciences Northwestern Polytechnical UniversityXi'an 710072P.R.China Key Laboratory of Insect Developmental and Evolutionary Biology CAS Center for Excellence in Molecular Plant SciencesShanghai Institute of Plant Physiology and EcologyChinese Academy of SciencesShanghai 200032.P.R.China

Hox genes of proboscipedia(pb)and Sex combs reduced(Scr)and their cofactors are required for determi nation of in sect mouthpart identity and play important roles in in sect orga n morphoge ***,i n the lepidoptera n in sects,in cludi ng many agricultural and forest pests,the roles of these genes in determi nation of mouthpart morphogenesis are un *** we report that both BmPB(Gene ID:101740380)and BmSCR(Gene ID:692761)are essential for labial palpus specification in a lepidoptera n model in sect,the silkworm,Bombyx *** embry onic morphoge nesis,CRISPR/Cas9-mediated mutagenesis of BmPB induced transformation of labial palpus into thoracic leg and BmSCR mutation transformed labial palpus into *** of Hox-related cofactor extradenticle(BmEXD;Gene ID:692478)and its nuclear localization factor homothorax(BmHTH;Gene ID:576938425)also induced distortion of embryonic labial ***,mutagenesis of each of the four genes induced severe degeneration of spigot morphogenesis,an important part of spinneret *** real-time PCR analysis further revealed that the transcriptional interaction among these *** data thus provide no vel evidence for Hox gene regulati on of in sect embry onic patterning.

关键词： Bombyx mori Hox genes CRISPR/Cas9 embryonic patterning