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Quantifying individual tree growth and tree competition using bi-temporal airborne laser scanning data:a case study in the Sierra Nevada Mountains,California

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International Journal of Digital Earth 2018年第5期11卷 485-503页

作者： Qin Ma Yanjun Su Shengli tao Qinghua Guo School of Engineering Sierra Nevada Research InstituteUniversity of California at MercedMercedCAUSA State Key Laboratory of Vegetation and Environmental Change Chinese Academy of SciencesInstitute of BotanyBeijingPeople’s Republic of China Department of Ecology College of Urban and Environmental Sciencesand Key Laboratory for Earth Surface Processes of the Ministry of EducationPeking UniversityBeijingPeople’s Republic of China

Improved monitoring and understanding of tree growth and its responses to controlling factors are important for tree growth *** Laser Scanning(ALS)can be used to enhance the efficiency and accuracy of large-scale forest surveys in delineating three-dimensional forest structures and under-canopy *** study proposed an ALSbased framework to quantify tree growth and ***-temporal ALS data were used to quantify tree growth in height(ΔH),crown area(ΔA),crown volume(ΔV),and tree competition for 114,000 individual trees in two conifer-dominant Sierra Nevada *** analyzed the correlations between tree growth attributes and controlling factors(*** sizes,competition,forest structure,and topographic parameters)at multiple *** the individual tree level,ΔH had no consistent correlations with controlling factors,ΔA andΔV were positively related to original tree sizes(R>0.3)and negatively related to competition indices(R0.7),ΔV was positively related to original tree sizes(|R|>0.8).Multivariate regression models were simulated at individual tree level forΔH,ΔA,andΔV with the R2 ranged from 0.1 to *** ALS-based tree height estimation and growth analysis results were consistent with field measurements.

关键词： Airborne Laser Scanning change detection tree growth tree competition Sierra Nevada

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Dexmededomidine in pediatric unilateral internal inguinal ring ligation

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World Journal of Clinical Cases 2022年第21期10卷 7376-7385页

作者： Guang Liu Ling Zhang Hui-Se Wang Yi Lin Hong-Quan Jin xiao-Dan Wang Wei-Na Qiao Ya-tao Zhang Jiao-Qian Sun Zhi-Na Liu Department of Anesthesiology Baoding Children's HospitalBaoding 071000Hebei ProvinceChina

BACKGROUND Safe and effective analgesia strategy remains one of the priorities for pediatric inguinal hernia *** To explore safety and efficacy of dexmededomidine monotherapy for postoperative analgesia in children who received laparoscopic unilateral internal inguinal ring *** This randomized single-center controlled trial included 390 children(aged 1-3 years,ASA grade I-II),randomly divided into a dexmededomidine group(D group),a dexmededomidine+sufentanil group(DS group),and a sufentanil group(S group).The primary endpoint was percentage of children with the Face,Legs,Activity,Cry,and Consolability(FLACC)score≤3 points 2 h after *** The comparisons of the FLACC scores at 2,4,6,8,12,and 24 h were not significantly different among the three groups(P>0.05).The sedative effects in the D group were significantly better than those in the S group(P>0.05),but not significantly different from those in the DS *** incidence of nausea and vomiting was significantly lower in the D group than in the S group and DS group(P>0.05).CONCLUSION Analgesic effects of dexmededomidine monotherapy are comparable to those of sufentanil alone or in combination with dexmededomidine for children who underwent laparoscopic unilateral internal inguinal ring ligation,with better sedative effects and a lower incidence of adverse events.

关键词： Child Dexmededomidine Inguinal hernia Pain management Laparoscopy Analgesics

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Analysis of Dimer Impurity in Polyamidoamine Dendrimer Solutions by Small-angle Neutron Scattering

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Chinese Journal of Polymer Science 2019年第8期37卷 827-833页

作者： Tian-Fu Li Yi-Yun Cheng Yu Wang Hui Wang Dong-Feng Chen Yun-tao Liu Li Zhang Wen-Ze Han Rong-Deng Liu Zi-Jun Wang chun-Ming Yang Charl J. Jafta Daniel Clemens Uwe Keiderling China Institute of Atomic Energy Beijing 102413 China Key Laboratory of Regulatory Biology School of Life Sciences East China Normal University Shanghai 200062 China Shanghai Synchrotron Radiation Facility Shanghai Institute of Applied Physics Chinese Academy of Sciences Shanghai 201204 China Helmholtz-Zentrum Berlin fürMaterialien und Energie Lise-Meitner-Campus Berlin 14109 Germany

Dimer impurity in the solution of a generation five(G5) polyamidoamine(PAMAM) dendrimer has been investigated by small-angle neutron scattering(SANS). The existence of dimer impurity in dendrimer solution was evidenced by indirect Fourier transform(IFT) analysis of the SANS data, in which the maximum dimension of particles in solution was found to be about twice the diameter of G5 dendrimer. We then developed an analytical model which accounts for the scattering contribution from both dendrimer monomer and dimer. The experimental data were well fitted by using the established model. The results showed that the amount of dimer impurities is significant for the measured three batches of G5 PAMAM dendrimers.

关键词： PAMAM dendrimer Dimer impurity Small-angle neutron scattering Scattering model

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Optimal transmission mode proportion for heterogeneous networks of cellular and device-to-device communications

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The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 21-27页

作者： LIU Zi-yang PENG tao WANG Wen-bo Key Laboratory of Universal Wireless Communications Beijing University of Posts and Telecommunications

This paper discusses about the optimal mode allocation for the heterogeneous networks, in which the network can schedule users working in the device-to-device （D2D） mode or cellular mode. The D2D user is allowed to reuse the uplink resource of cellular system and the problem is formed as a sum-capacity optimization issue with outage constraints for both cellular and D2D links. The method for the optimal user proration is proved to be divided into three cases according to the total user density： when the total user density is small, the optimal proration trends to all users utilizing one mode; when the total user density is large, the optimal proration is all of users choosing D2D mode; and when the total user density situates in the between, there is a unique optimal transmission mode proportion for the hybrid networks to maximize its sumcapacity. The simulation results demonstrate the validity of the conclusions in the analysis part.

关键词： device-to-device mode proration sum-capacity optimization

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Flexible strain sensors fabricated using aligned carbon nanofiber membranes with cross-stacked structure for extensive applications

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International Journal of Smart and Nano Materials 2022年第3期13卷 432-446页

作者： tao Yan Yuting Wu Jian Tang Zhijuan Pan College of Textile and Clothing Engineering Soochow UniversitySuzhouP.R.China National Engineering Laboratory for Modern Silk SuzhouP.R.China

Carbon nanofibers(CNFs)with excellent conductivity and stability have become a promising material to design the strain sensing *** date,however,the effect of the stacked structure of CNF membrane on the sensing performance has rarely been *** this work,we reported a high-performance sensor based on the cross-stacked aligned CNF *** effects of crossstacked structures on the sensing characteristics were systemati-cally *** flexible strain sensor could capture low detection limit(0.998),excellent durability and quick response time(<200 ms)were *** excellent com-prehensive performances were simultaneously *** sen-sor could be used in extensive applications,such as monitoring body movements and distinguishing the track of writing.

关键词： Electrospinning carbon nanofiber membrane crossstacked structure strain sensor extensive applications

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Kindlin-2 regulates skeletal homeostasis by modulating PTH1R in mice

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Signal Transduction and Targeted Therapy 2021年第1期6卷 131-143页

作者： Xuekun Fu Bo Zhou Qinnan Yan Chu tao Lei Qin xiaohao Wu Sixiong Lin Sheng Chen Yumei Lai Xuenong Zou Zengwu Shao Meiqing Wang Di Chen Wenfei Jin Youqiang Song Huiling Cao Ge Zhang Guozhi xiao School of Medicine Guangdong Provincial Key Laboratory of Cell Microenvironment and Disease Researchand Shenzhen Key Laboratory of Cell MicroenvironmentSouthern University of Science and Technology1088 Xue Yuan Road518055 ShenzhenGuangdongChina Law Sau Fai Institute for Advancing Translational Medicine in Bone and Joint Diseases School of Chinese MedicineHong Kong Baptist University999077 Hong KongSARChina Department of Biology Southern University of Science and Technology518055 ShenzhenChina School of Biomedical Sciences University of Hong Kong21 Sassoon RoadHong KongChina Department of Spine Surgery Orthopedic Research InstituteThe First Affiliated Hospital of Sun Yat-sen UniversityGuangdong Provincial Key Laboratory of Orthopedics and Traumatology510080 GuangzhouChina Department of Orthopedics Union HospitalTongji Medical CollegeHuazhong University of Science and Technology430022 WuhanChina Department of Orthopedic Surgery Rush University Medical CenterChicagoIL 60612USA State Key Laboratory of Military Stomatology National Clinical Research Center for Oral DiseasesShanxi International Joint Research Center for Oral DiseasesDepartment of Oral Anatomy and Physiology and TMDSchool of Stomatologythe Fourth Military Medical University145 Changle West RoadXi’anChina Research Center for Human Tissues and Organs Degeneration Shenzhen Institutes of Advanced TechnologyChinese Academy of Sciences518055 ShenzhenChina

In vertebrates,the type 1 parathyroid hormone receptor(PTH1R)is a critical regulator of skeletal development and homeostasis;however,how it is modulated is incompletely *** we report that deleting Kindlin-2 in osteoblastic cells using the mouse 10-kb Dmp1-Cre largely neutralizes the intermittent PTH-stimulated increasing of bone volume fraction and bone mineral density by impairing both osteoblast and osteoclast formation in murine adult ***-cell profiling reveals that Kindlin-2 loss increases the proportion of osteoblasts,but not mesenchymal stem cells,chondrocytes and fibroblasts,in non-hematopoietic bone marrow cells,with concomitant depletion of osteoblasts on the bone surfaces,especially those stimulated by ***,haploinsufficiency of Kindlin-2 and Pth1r genes,but not that of either gene,in mice significantly decreases basal and,to a larger extent,PTH-stimulated bone mass,supporting the notion that both factors function in the same genetic ***,Kindlin-2 interacts with the C-terminal cytoplasmic domain of PTH1R via aa 474–475 and Gsα.Kindlin-2 loss suppresses PTH induction of cAMP production and CREB phosphorylation in cultured osteoblasts and in ***,PTH promotes Kindlin-2 expression in vitro and in vivo,thus creating a positive feedback regulatory ***,estrogen deficiency induced by ovariectomy drastically decreases expression of Kindlin-2 protein in osteocytes embedded in the bone matrix and Kindlin-2 loss essentially abolishes the PTH anabolic activity in bone in ovariectomized ***,we demonstrate that Kindlin-2 functions as an intrinsic component of the PTH1R signaling pathway in osteoblastic cells to regulate bone mass accrual and homeostasis.

关键词： homeostasis Kindlin skeletal

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Effects of different resuscitation fluid on severe acute pancreatitis

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World Journal of Gastroenterology 2013年第13期19卷 2044-2052页

作者： Gang Zhao Jun-Gang Zhang He-Shui Wu Jin tao Qi Qin Shi-Chang Deng Yang Liu Lin Liu Bo Wang Kui Tian Xiang Li Shuai Zhu chun-You Wang Pancreatic Disease Institute Union HospitalTongji Medical CollegeHuazhong University of Science and Technology

AIM: To compare effects of different resuscitation fluid on microcirculation, inflammation, intestinal barrier and clinical results in severe acute pancreatitis (SAP). METHODS: One hundred and twenty patients with SAP were enrolled at the Pancreatic Disease Institute between January 2007 and March 2010. The patients were randomly treated with normal saline (NS group), combination of normal saline and hydroxyethyl starch (HES) (SH group), combination of normal saline, hydroxyethyl starch and glutamine (SHG group) in resuscitation. The ratio of normal saline to HES in the SH and SHG groups was 3:1. The glutamine (20% glutamine dipeptide, 100 mL/d) was supplemented into the resuscitation liquid in the SHG group. Complications and outcomes including respiratory and abdominal infection, sepsis, abdominal hemorrhage, intra-abdominal hypertension, abdominal compartment syndrome (ACS), renal failure, acute respiratory distress syndrome (ARDS), multiple organ dysfunction syndrome (MODS), operation intervention, length of intensive care unit stay, length of hospital stay, and mortality at 60 d were compared. Moreover, blood oxygen saturation (SpO 2 ), gastric intramucosal pH value (pHi), intra-abdominal pressure (IAP), inflammation cytokines, urine lactulose/mannitol (L/M) ratio, and serum endotoxin were investigated to evaluate the inflammatory reaction and gut barrier. RESULTS: Compared to the NS group, patients in the SH and SHG groups accessed the endpoint more quickly (3.9 ± 0.23 d and 4.1 ± 0.21 d vs 5.8 ± 0.25 d, P < 0.05) with less fluid volume (67.26 ± 28.53 mL/kg/d, 61.79 ± 27.61 mL/kg per day vs 85.23 ± 21.27 mL/kg per day, P < 0.05). Compared to the NS group, incidence of renal dysfunction, ARDS, MODS and ACS in the SH and SHG groups was obviously lower. Furthermore, incidence of respiratory and abdominal infection was significantly decreased in the SH and SHG groups, while no significant difference in sepsis was seen. Moreover, less operation time was needed in t

关键词： Microcirculation Intestinal barrier Inflammatory reaction Intra-abdominal hypertension Capillary leakage syndrome

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Dependability analysis of the data communication system in train control system

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Science China(Technological Sciences) 2009年第9期52卷 2605-2618页

作者： XU TianHua TANG tao GAO chunHai CAI BaiGen State Key Laboratory of Rail Traffic Control and Safety Beijing Jiaotong UniversityBeijing 100044China

Communication based train control (CBTC) system is based on mobile communication and overcomes fixed blocks in order to increase track utilization and train safety. The data communication system (DCS) between trains and wayside equipment is a crucial factor for the safe and efficient operation of CBTC system. The dependability under various transmission conditions needs to be modeled and evaluated. In this paper,a stochastic reward net (SRN) model for DCS based IEEE 802.11 standard was developed,which captures all relevant failure and failure recovery behavior system aspects in a concise way. We compared the reliability,availability for DCS with and without access point (AP) and antenna redundant configuration. We also quantitatively evaluated and compared the frame loss probability for three DCS configurations with different train velocities and train numbers in one radio cell. Fixed-point iteration was adopted to simplify the analysis. Numerical results showed the significant improvement of the reliability,availability and the frame loss probability index for the full redundant configuration.

关键词： dependability analysis data communication system (DCS) stochastic reward net (SRN) communication based train control (CBTC)

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原位合成Al_2O_3颗粒增强双相TiAl基复合材料的组织与性能

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中国有色金属学报 2007年第11期17卷 1849-1854页

作者：艾桃桃王芬冯小明郭从盛陕西理工学院材料科学与工程学院汉中723003 陕西科技大学材料科学与工程学院西安710021

以Ti-Al-TiO2反应体系为基础,添加不同含量的Nb2O5粉,采用压力协助原位合成Al2O3颗粒增强的双相TiAl基复合材料,对复合材料的组织和力学性能进行了分析讨论,并探讨了其增韧机制。结果表明:Nb2O5的掺杂使复合材料的相对密度和硬度得到提... 详细信息

以Ti-Al-TiO2反应体系为基础,添加不同含量的Nb2O5粉,采用压力协助原位合成Al2O3颗粒增强的双相TiAl基复合材料,对复合材料的组织和力学性能进行了分析讨论,并探讨了其增韧机制。结果表明:Nb2O5的掺杂使复合材料的相对密度和硬度得到提高,抗弯强度和断裂韧性在Nb2O5掺杂量为6%(质量分数)时达到最大,分别为398.38 MPa和6.992 MPa.m1/2。微观组织分析表明,获得了双相组织,Al2O3颗粒分布于基体晶界处;随Nb2O5的掺杂量增大,Al2O3颗粒呈细小弥散分布,同时基体晶粒尺寸也减小。双相基体晶粒的细化及Al2O3颗粒的弥散分布是赋予材料高韧性的主要增韧机制。

关键词：双相TiAl合金 Al2O3 原位反应组织结构力学性能增韧机制

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Simple Minimum(K_4-e)-coverings of Complete Multipartite Graphs

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Acta Mathematica Sinica,English Series 2019年第5期35卷 632-648页

作者： Yu Feng GAO Yan Xun CHANG tao FENG Institute of Mathematics Beijing Jiaotong University College of Mathematics Tonghua Normal University

A decomposition of K_(n(g))∪Γ, the complete n-partite equipartite graph over gn vertices union a graph Γ(called the excess) that is a subgraph of K_(n(g)), into edge disjoint copies of a graph G is called a simple minimum group divisible covering of type g^n with G if Γ contains as few edges as possible. We examine all possible excesses for simple minimum group divisible(K_4-e)-*** and sufficient conditions are established for their existence.

关键词： Group divisible covering (K4-e)-covering excess graph

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