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Plantation transformation alternatives determine carbon sequestration capacity – a case study with Pinus massoniana in southern China

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Journal of Mountain Science 2020年第4期17卷 919-930页

作者： ruan lu-ping lu Yuan-chang MENG Jing-hui Research Center of Forest Management Engineering of National Forestry and Grassland Administration Beijing Forestry UniversityBeijing 100083China Institute of Forest Resource and Information Techniques Chinese Academy of ForestryBeijing 100091China

It is widely accepted that global warming, which results from the increase of carbon dioxide(CO2) in the atmosphere, has a negative impact on human beings. Forests are the largest terrestrial ecosystem and play an important role in carbon sequestration. Many studies have documented that a mixed-species forest can sequester more carbon than single species forests, depending on the site conditions. Therefore, uneven-aged mixed-species forest management has been receiving more and more attention. In 2008, an experiment with five silvicultural models for Pinus massoniana(Chinese red pine) plantation, i.e., four transformation treatments(A1-A4) and one control treatment(A5) was conducted in the Experimental Center of Tropical Forestry of Chinese Academy of Forestry in pingxiang City, in southwestern Guangxi Zhuang Autonomous Region, southern China. The four transformation treatments(A1-A4) enriched Castanopsis hystrix, Manglietia glance, Erythrophleum fordii and Quercus griffithii with differed richness and composition after thinning(removed 70% of trees), while no silvicultural treatment was used in the control treatment A5. In this study, we compared the carbon sequestration capacity of these five silvicultural models based on periodic annual increment and growth rate. Our results indicated that all the transformation treatments performed significantly better in carbon sequestration than the control treatment. A significant difference was also observed amongst the transformation treatments. Moreover, the transformation treatment A1 with enrichment species Castanopsis hystrix(350 trees·ha^-1) and Manglietia glance(350 trees·ha^-1) was determined to be the optimal model for maximum carbon sequestration because of its high tree-level growth rate and high economic value of enriched plantings, which could be popularized in other places. Our results further confirmed that management using mixed-species forests is a better approach to combat climate change than using monocult

关键词： Global warming Carbon sequestration Mixed-species forest Silvicultural model Singlespecies(monoculture)forest

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The CalderSn-Zygmund Decomposition and Interpolation on Weighted Hardy Spaces

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Acta Mathematica Sinica,English Series 2011年第10期27卷 1967-1978页

作者： Zhuo ping ruan Department of Mathematics Beijing Normal University Beijing 100875 P. R. China

We apply discrete Littlewood Paley Stein theory, developed by Han and lu, to establish Calderon Zygmund decompositions and interpolation theorems on weighted Hardy spaces Hp for w C A∞ in both the one-parameter and t... 详细信息

关键词： Calderdn Zygmund decomposition interpolation weighted Hardy spaces discrete Little- wood Paley analysis

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Bimagnetic metal constructed core-shell structure of Fe@Co nanowires for multi-band microwave absorption

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Progress in Natural Science:Materials International 2024年第2期34卷 354-361页

作者： ping-an Yang Rui Cai Haibo ruan Nanqing Zhang Xin Huang Rui Li Yuxin Zhang Yi lu Zhihao Zhou School of Automation Chongqing University of Posts and Telecommunications Chongqing Key Laboratory of Materials Surface & Interface Science Chongqing University of Arts and Sciences College of Engineering and Technology Zunyi Normal College College of Material Science and Engineering Chongqing University

Controlled fabrication of materials by surface modification techniques has been a hot research topic. In this paper,one-dimensional(1D) core-shell structure Fe@Co nanowires(NWs) were successfully prepared by anchoring 0-dimensional(0D) Co nanoparticles on 1D Fe NWs based on the in situ reduction method. The electromagnetic parameters of the specimens at a filler mass fraction of 25 wt% were tested and the microwave loss mechanism was deeply analyzed. Binary magnetic metals in a core-shell structure have excellent multi-band microwave absorption capability(S-band, X-band and Ku-band). This is due to the heterogeneous interface and magnetic coupling effects tuning the dielectric and magnetic loss. This study offers a workable plan for creating effective multi-band magnetic metal-based microwave absorbers.

关键词： Core-shell structure Interface Magnetic coupling Microwave absorption One-dimensional nanowires

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Researches on the Structure and Properties of Mullite Solid Solution Made from Industrial Waste

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Chinese Journal of Structural Chemistry 2006年第8期25卷 965-970页

作者： ruan Yu-Zhong YU Yan WU Ren-ping College of Materials Science and Engineering Fuzhou University Fuzhou 350002 China

The waste slag from aluminum profile factory and silicon fine powder from ferroalloy factory were utilized as the main raw materials to synthesize mullite solid solution Al4＋2xSi2-xO10-x/2, whose defect formation mechanism, crystalline phase composition, crystal cell parameters, microstructures and morphologies were characterized in detail by XRD and SEM. The results show that because of the ultrafine particle size of the materials, the content of mullite solid solution synthesized by this method is higher than that by regular method. Keywords： waste slag from aluminum factory, silicon fine powder, mullite, solid solution

关键词： waste slag from aluminum factory silicon fine powder mullite solid solution

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Studies on the Structure and Properties of Multiphase Al_2O_3 Abrasion-resistant Ceramics

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Chinese Journal of Structural Chemistry 2006年第7期25卷 805-810页

作者： WU Ren-ping YU Yan ruan Yu-Zhong College of Materials Science and Engineering Fuzhou University Fuzhou 350002 China

The Al2O3 abrasion-resistant ceramics is successfully prepared by using waste aluminum sludge as the main raw material with the addition of a little clay, talc and barium carbonate. The crystal structure and microstructure of ceramic are characterized by means of XRD, SEM, etc., and the physical and mechanical properties are also tested. The results show that besides the phase of corundum, a little mullite, Mg-Al spinel and hyalophane phases also exist in the product. These phases are produced via reaction in-situ, which can inhibit the overgrowth of Al2O3 grain in grain boundary, and improve the integral property of the material.

关键词： Al2O3 ceramic crystal structure property in-situ synthesis

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EMERGENCE ANGLE OF FLOW OVER AN AERATOR

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Journal of Hydrodynamics 2007年第5期19卷 601-606页

作者： WU Jian-hua ruan Shi-ping College of Water Conservancy and Hydropower Engineering Hohai University Nanjing 210098 China

Aerator is an important device for release works of hydraulic structures with high-speed flow in order to protect them from cavitation damage. This kind of protecting effect is related closely to cavity length below the aerator, while the cavity length is dominated by the emergence angle over the aerator. Therefore it is crucial to determine this angle accurately. In the present paper the affecting intensities of flow depth and the fluctuating velocity on this angle were analyzed through two introduced parameters. Furthermore, the improved expressions of emergence angle estimation, for both ramp-type and step-type aerators, were presented by means of 68 sets of experimental data from 6 projects based on error theory. The results showed that the present method has higher accuracy than the previously reported methods.

关键词： aerator cavitation damage cavity length,emergence angle flow depth fluctuating velocity

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The life-saving emergency thoracic endovascular aorta repair management on suspected aortoesophageal foreign body injury

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World Journal of Emergency Medicine 2020年第3期11卷 152-156页

作者： Wei-shuyi ruan Yuan-qiang lu Department of Emergency Medicine the First Affi liated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China Department of Geriatric Medicine the First Affi liated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China Zhejiang Provincial Key Laboratory for Diagnosis and Treatment of Aging and Physic-chemical Injury Diseases the First Affi liated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China

BACKGROUND:Fatal aortic rupture caused by esophageal foreign body(EFB),is associated with a high mortality,but can be prevented by thoracic endovascular aorta repair(TEVAR)that performed increasingly as technology *** study aims to investigate the cause,management and prognosis of suspected penetrating aortoesophageal foreign body ***:Twelve cases who met the criteria were enrolled in this *** demographic and clinical data were reviewed for evaluating the characteristics of ***:Among 12 cases enrolled,7 were males and 5 were females,with an age 27–86 *** distance of EFB from aorta(DFA)of 7 cases were less than or equal to 0 mm,5 cases were 0–2 *** cases were managed with TEVAR,only one case was with open surgery standby but finally treated by flexible endoscopy(FE)successfully,without *** group with TEVAR,EFB of 7 cases were successfully removed by rigid endoscopy(RE),and one of them was failed at the first RE *** of 2 cases were successfully removed by open surgery with TEVAR,and other 9 cases were managed by endoscopies with *** mean length of stay of hospitalization(LOS)and length of ICU stay of patients treated by open surgery with TEVAR(18.50±2.12 days and 5.50±0.71 days)was significantly longer than those of patients treated by endoscopy with TEVAR(7.00±2.74 days and 1.33±1.12 days,P<0.001 and P=0.001,respectively).Five cases had severe ***:Rational application of TEVAR can be a life-saving management for aortoesophageal foreign body injury,and jointed with endoscopy is safe and effective with a shorter length of ICU or total hospital stay.

关键词： Aortoesophageal foreign body injury Thoracic endovascular aorta repair

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GAEP:a comprehensive genome assembly evaluating pipeline

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Journal of Genetics and Genomics 2023年第10期50卷 747-754页

作者： Yong Zhang Hong-Wei lu Jue ruan Shenzhen Branch Guangdong Laboratory of Lingnan Modern AgricultureGenome Analysis Laboratory of the Ministry of Agriculture and Rural AffairsAgricultural Genomics Institute at ShenzhenChinese Academy of Agricultural SciencesShenzhenGuangdong 518120China State Key Laboratory of Rice Biology and Breeding China National Rice Research InstituteChinese Academy of Agricultural SciencesHangzhouZhejiang 311401China

With the rapid development of sequencing technologies,especially the maturity of third-generation sequencing technologies,there has been a significant increase in the number and quality of published genome *** emergence of these high-quality genomes has raised higher requirements for genome *** numerous computational methods have been developed to evaluate assembly quality from various perspectives,the selective use of these evaluation methods can be arbitrary and inconvenient for fairly comparing the assembly *** address this issue,we have developed the Genome Assembly Evaluating Pipeline(GAEP),which provides a comprehensive assessment pipeline for evaluating genome quality from multiple perspectives,including continuity,completeness,and ***,GAEP includes new functions for detecting misassemblies and evaluating the assembly redundancy,which performs well in our *** is publicly available at https://***/zyoptimistic/GAEP under the GPL3.0 *** GAEP,users can quickly obtain accurate and reliable evaluation results,facilitating the comparison and selection of high-quality genome assemblies.

关键词： Genome assembly Assembly quality Assembly metrics Assembly evaluation pipeline Misassembly detection Misassembly breakpoint Assembly redundancy

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Molecular Dynamics Simulation of the Evolution of Interfacial Dislocation Network and Stress Distribution of a Ni-Based SingleCrystal Superalloy

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Acta Metallurgica Sinica(English Letters) 2016年第7期29卷 689-696页

作者： Yun-Li Li Wen-ping Wu Zhi-Gang ruan Key Laboratory of Geotechnical and Structural Engineering Safety of Hubei Province School of Civil EngineeringWuhan University State Key Laboratory of Water Resources and Hydropower Engineering Science Wuhan University

The evolution of misfit dislocation network at γ/γ＇ phase interfaces and the stress distribution characteristics of Ni-based single-crystal superalloys under different temperatures of 0, 100 and 300 K are studied by molecular dynamics （MD） simulation. It was found that a closed three-dimensional misfit dislocation network appears on the γ/γ＇ phase interfaces, and the shape of the dislocation network is independent of the lattice mismatch. Under the influence of the temperature, the dislocation network gradually becomes irregular, a/2 [110] dislocations in the γ matrix phase emit and partly cut into the γ＇ phase with the increase in temperature. The dislocation evolution is related to the local stress field, a peak stress occurs at γ/γ＇ phase interface, and with the increase in temperature and relaxation times, the stress in the γ phase gradually increases, the number of dislocations in the γ phase increases and cuts into γ＇ phase from the interfaces where dislocation network is damaged. The results provide important information for understanding the temperature dependence of the dislocation evolution and mechanical properties of Ni-based single-crystal superalloys.

关键词： Ni-based single-crystal superalloy Molecular dynamics simulation Dislocation network Stress distribution

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Pseudo-capacitance of ruthenium oxide/carbon black composites for electrochemical capacitors

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Journal of University of Science and Technology Beijing 2008年第6期15卷 816-821页

作者： Xiaofeng Wang Dianbo ruan Peng Wang Yiqiang lu Department of Precision Instruments and Mechanics Tsinghua University Beijing 100084 China School of Applied Science University of Science and Technology BeiJing Beijing 100083 China

Hydrous ruthenium oxide was formed by a new process. The precursor was obtained by mixing the aqueous solutions of RuCl3xH2O and NaHCO3. The addition of NaHCO3 led to the formation of an oxide with extremely fine RuO2 particles forming a porous network structure in the oxide electrode. Polyethylene glycol was added as a controller to partly inhibit the sol-gel reaction. The rate capacitance of 530 F·g^-1 was measured for the powder formed at an optimal annealing temperature of 210℃. Several details concerning this new material, including crystal structure, particle size as a function of temperature, and electrochemical properties, were also reported. In addition, the rate capacitance of the composite electrode reached 800 F·g^-1 after carbon black was added. By using the modified electrode of a RuO2/carbon black composite electrode, the electrochemical capacitor exhibits high energy density and stable power characteristics. The values of specific energy and maximum specific power of 24 Wh·kg^-1 and 4 kW·kg^-1, respectively, are demonstrated for a cell voltage between 0 and 1 V.

关键词： electrochemical capacitor ruthenium oxide polyethylene glycol carbon black

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