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Recent progress and application of materials life cycle assessment in China

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Progress in Natural Science:Materials International 2011年第1期21卷 1-11页

作者： Zuo-ren NIE,Feng GAO,xian-zheng gong,Zhi-hong WANG,Tie-yong ZUO College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China College of Materials Science and Engineering Beijing University of Technology Beijing 100124 China

Life cycle assessment(LCA) is a technique for systematically analyzing the environmental impacts and resources used throughout a target’s life cycle,*** raw material acquisition,via production and use phases,to waste *** is an effective tool that gives a detailed information of environmental profiles of a material or a *** importantly,the value of life cycle thinking lies in its ability to provide the decision-making basis for sustainable development,making the products, industries and even the whole industry chain act more in line with the principles of sustainable *** recent developments of LCA methods and applications of materials life cycle assessment in China were *** the sections on LCA methodology,the data quality analysis,the impact of land use and abiotic resource depletion as well as the weakness in life cycle impact assessment were *** relation to the applications,the Chinese materials database(SinoCenter Database) and several representative case studies such as life cycle analysis of civilian buildings and metal production in China were introduced.

关键词： materials life cycle assessment LCIA methodology

Hypoxia-preconditioned bone marrow-derived mesenchymal stem cells protect neurons from cardiac arrest-induced pyroptosis

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Neural Regeneration Research 2025年第4期20卷 1103-1123页

作者： Xiahong Tang Nan zheng Qingming Lin Yan You zheng gong Yangping Zhuang Jiali Wu Yu Wang Hanlin Huang Jun Ke Feng Chen Shengli Clinical Medical College of Fujian Medical University Fujian Medical UniversityFuzhouFujian ProvinceChina Department of Emergency Fujian Provincial HospitalFuzhouFujian ProvinceChina Fujian Provincial Key Laboratory of Emergency Medicine FuzhouFujian ProvinceChina The Second Department of Intensive Care Unit Fujian Provincial Hospital South BranchFuzhouFujian ProvinceChina

Cardiac arrest can lead to severe neurological impairment as a result of inflammation,mitochondrial dysfunction,and post-cardiopulmonary resuscitation neurological *** preconditioning has been shown to improve migration and survival of bone marrow–derived mesenchymal stem cells and reduce pyroptosis after cardiac arrest,but the specific mechanisms by which hypoxia-preconditioned bone marrow–derived mesenchymal stem cells protect against brain injury after cardiac arrest are *** this end,we established an in vitro co-culture model of bone marrow–derived mesenchymal stem cells and oxygen–glucose deprived primary neurons and found that hypoxic preconditioning enhanced the protective effect of bone marrow stromal stem cells against neuronal pyroptosis,possibly through inhibition of the MAPK and nuclear factor κB ***,we transplanted hypoxia-preconditioned bone marrow–derived mesenchymal stem cells into the lateral ventricle after the return of spontaneous circulation in an 8-minute cardiac arrest rat model induced by *** results showed that hypoxia-preconditioned bone marrow–derived mesenchymal stem cells significantly reduced cardiac arrest–induced neuronal pyroptosis,oxidative stress,and mitochondrial damage,whereas knockdown of the liver isoform of phosphofructokinase in bone marrow–derived mesenchymal stem cells inhibited these *** conclude,hypoxia-preconditioned bone marrow–derived mesenchymal stem cells offer a promising therapeutic approach for neuronal injury following cardiac arrest,and their beneficial effects are potentially associated with increased expression of the liver isoform of phosphofructokinase following hypoxic preconditioning.

关键词： bone marrow–derived mesenchymal stem cells cardiac arrest cardiac resuscitation hypoxic preconditioning liver isoform of phosphofructokinase mitochondria neuroinflammation oxidative stress pyroptosis reactive oxygen species

黄土高原森林林下植被物种多样性及其影响因素

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东北林业大学学报 2025年第2期53卷 66-74页

作者：宫正黄河文明与可持续发展研究中心(河南大学) 开封475001

以黄土高原不同密度刺槐(Robinia pseudoacacia)林为研究对象,通过调查样地的地形及土壤理化性质,利用方差分析、线性拟合、冗余分析等方法,分析林下植被物种多样性特征,探究影响林下植被物种多样性的因素。结果表明:不同林分密度的刺... 详细信息

以黄土高原不同密度刺槐(Robinia pseudoacacia)林为研究对象,通过调查样地的地形及土壤理化性质,利用方差分析、线性拟合、冗余分析等方法,分析林下植被物种多样性特征,探究影响林下植被物种多样性的因素。结果表明:不同林分密度的刺槐林林下植被物种多样性存在显著差异(P<0.05)。刺槐林下灌木Margalef丰富度指数随坡向的增大而减小,林下草本植物Margalef丰富度指数随坡度的增加而减小。刺槐林下灌木植物物种多样性的主要影响因素是密度、坡向、土壤全氮质量分数、土壤铵态氮质量分数,草本植物物种多样性的主要影响因素是土壤速效磷质量分数。

关键词：刺槐林物种多样性影响因素冗余分析黄土高原

The low-latitude sodium layer:comparative data from lidar observations at Hainan,China and São Paulo,Brazil

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Earth and Planetary Physics 2025年第1期9卷 39-53页

作者： Fang Wu Jing Jiao GuoTao Yang LiFang Du zhengKuan Liu HaoRan zheng JiXin Guo ShaoHua gong YaJun Zhu State Key Laboratory of Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China Hainan National Field Science Observation and Research Observatory for Space Weather National Space Science CenterChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China China-Brazil Joint Laboratory for Space Weather NSSC/INPESão Josédos Campos 12227-010Brazil School of Physics and Electronics Engineering Hainan Normal UniversityHaikou 571158China

Physical and chemical processes observed in the mesosphere and thermosphere above the Earth’s low latitudes are complex and highly interrelated to activity in the low-latitude *** sodium detected by lidar can yield clues to dynamic and chemical processes in these spatial layers above the Earth’s *** paper is based on sodium layer data collected at two low-latitude stations,one in the northern hemisphere and one in the *** low-latitude sodium layer exhibits conspicuous seasonal variations in shape,density,and altitude;these variations are similar between Earth’s hemispheres:sodium layer density at both stations reaches its seasonal maximum in autumn and minimum in ***,maximal Na density over Brazil is greater than that over *** variations of Na density above the two low-latitude stations are also similar;at both,maxima are observed before *** variations of the Na layer over Brazil that differ from those observed in the northern hemisphere may be related to the South Atlantic Magnetic Anomaly(SAMA)or fountain *** suggest that low-latitude Na layer data may provide useful additional evidence that could significantly improve the low-latitude part of the WACCM-Na model.

关键词： metallic sodium layer seasonal variation nocturnal variation lidar

Tailoring coercive field in rare earth giant magnetostrictive materials byα-Fe precipitation

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Rare Metals 2023年第2期42卷 606-613页

作者： Fang-xian Zhang Peng-Qiang Hu zheng-Ming Zhang Jian-Hu gong Dun-Hui Wang Division of Microelectronic Materials and Devices Hangzhou Dianzi UniversityHangzhou310018China National Laboratory of Solid State Microstructures Nanjing UniversityNanjing210093China

Rare earth giant magnetostrictive materials(GMMs)Tb_(1-x)Dy_(x)Fe_(2±δ)(Tb-Dy-Fe)have been successfully employed in many microelectromechanical devices due to their excellent magnetostrictive properties at room ***,Tb-Dy-Fe still shows a relatively large coercivity with high hysteresis,which inevitably limits its application ***,micromagnetic simulations are performed to investigate the size effect of precipitated phase(α-Fe)on coercivity in *** results demonstrate that the coercivity is reduced from 31.46 to 12.48 mT with increasing the size ofα-Fe from 4 to 50 nm in Tb-Dy-Fe since the precipitated phase ofα-Fe can act as a magnetization reversal *** decreasing trend of coercivity can be well fitted with an inverse square relationship,which agrees well with the nucleation *** study highlights that the coercivity of Tb-Dy-Fe can be tailored by tuning the size ofα-Fe precipitation.

关键词： Giant magnetostrictive material(GMM) Precipitation Coercivity Micromagnetic simulation

Laser-Induced Distortions and Disturbance Propagation of Delocalized Electronic States in Monatomic Carbon Chains

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Chinese Physics Letters 2012年第6期29卷 219-222页

作者： YANG gong-xian gong Xiu-Fang School of Materials Science and Engineering Xi’an University of TechnologyXi’an 710048 Dongfang Turbine Co. LtdDeyang 618000

Tight-binding electron-ion dynamics of carbon chains pumped by intense laser pulses are performed to study the interactions between monatomic carbon chains and ***-induced distortions of carbon chains,which are enhanced by a long wavelength laser,are *** carbon chains with a strong laser beam focused on one terminal are simulated to study the disturbance of electronic *** the superposition of delocalized π band states,the disturbance propagates from the illuminated area to the non-illuminated area in a velocity ofabout 106 m/s at 0 K,and this velocity is weakened at room temperature due to the localization effect of thermal fluctuation.

关键词： pumped chains atomic

Freezing the kinase signaling of breast cancer with transformable peptide nanoparticles

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Science China Chemistry 2020年第8期63卷 1021-1022页

作者： Di-Wei zheng xian-zheng Zhang Key Laboratory of Biomedical Polymers of Ministry of Education&Department of Chemistry Wuhan UniversityWuhan 430072China

Protein kinases have been recognized as dominant regulators of all aspects of tumor progression,including tumorigenesis,proliferation,invasion,and metastasis[1].During the activation of protein kinases,the binding of ligands(e.g.,epidermal growth factor,transforming growth factor-α,and amphiregulin)can cause dimerization,which promotes the cell growth and triggers a cascade of downstream signaling pathways.

关键词： invasion metastasis breast

Nonlinear robust control of a quadrotor helicopter with finite time convergence

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Control Theory and Technology 2018年第2期16卷 133-144页

作者： Guozhou zheng Bin xian School of Electrical and Information Engineering Tianjin University Tianjin 300072 China

In this paper, the control problem for a quadrotor helicopter which is subjected to modeling uncertainties and unknown external disturbance is investigated. A new nonlinear robust control strategy is proposed. First, a nonlinear complementary filter is developed to fuse the raw data from the onboard barometer and the accelerometer to decrease the negative effects from the noise associated with the low-cost onboard sensors Then the adaptive super-twisting methodology is combined with a backstepping method to formulate the nonlinear robust controller for the quadrotor＇s attitude angles and the altitude position. Lyapunov based stability analysis shows that finite time convergence is ensured for the closed-loop operation of the quadrotor＇s roll angle, pitch angle, row angle and the altitude position. Real-time flight experimental results, which are performed on a quadrotor flight testbed, are included to demonstrate the good control performance of the proposed control methodology.

关键词： Quadrotor nonlinear control finite time convergence real-time experiment

The Hamilton-Connectivity with the Degree Sum of Non-adjacent Subgraphs of Claw-free Graphs

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Acta Mathematicae Applicatae Sinica 2019年第3期35卷 580-590页

作者： Wei zheng Li-gong WANG Department of Applied Mat hem a tics School of ScienceNorthwes tern Polytechnical Univers计yXi5an 710072China Xi'an-Budapest Joint Research Center for Combinatorics Northwestern Polytechnical UniversityXi'an 710129China

The degree d(H)of a subgraph H of a graph G is|u∈∪V(H)N(u)-V(H)|,where N(u)denotes the neighbor set of the vertex u of *** this paper,we prove the following result on the condition of the degrees of *** G be a 2-connected claw-free graph of order n with minimum degreeδ(G)≥*** for any three non-adjacent subgraphs H1,H2,H3 that are isomorphic to K1,K1,K2,respectively,there is d(H1)+d(H2)+d(H3)≥n+3,then for each pair of vertices u,v∈G that is not a cut set,there exists a Hamilton path between u and v.

关键词： Claw-free graph non-adjacent subgraph degree of subgraph Hamilton path