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Case History of the Disastrous Debris Flows of Tianmo Watershed in Bomi County, Tibet, China: Some Mitigation Suggestions

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Journal of Mountain Science 2014年第5期11卷 1253-1265页

作者： GE yong-gang CUI peng SU Feng-huan ZHANG jian-qiang CHEN Xing-zhang Key Laboratory of Mountain Hazards and Earth Surface Processes / Institute of Mountain Hazards and Environment Chinese Academy of Sciences School of Environment and Resources Southwest University of Sciences and Technology

Debris flows and landslides, extensively developing and frequently occurring along Parlung Zangbo, seriously damage the Highway from Sichuan to Tiebt(G318) at Bomi County. The disastrous debris flows of the Tianmo Watershed on Sept. 4, 2007, July 25, 2010 and Sept. 4, 2010, blocked Parlung Zangbo River and produced dammed lakes, whose outburst flow made 50 m high terrace collapse at the opposite bank due to intense scouring on the foot of the terrace. As a result, the traffic was interrupted for 16 days in 2010 because that 900 m highway base was destructed and 430 m ruined. These debris flows were initiated by the glacial melting which was induced by continuous higher temperature and the following intensive rainfall, and expanded by moraines along channels and then blocked Parlung Zangbo. At the outlet of watershed,the density, velocity and peak discharge of debris flow was 2.06 t/m3, 12.7 m/s and 3334 m3/s, respectively. When the discharge at the outlet and the deposition volume into river exceeds 2125 m3/s and 126×103 m3, respectively, debris flow will completely blocked Parlung Zangbo. Moreover,if the shear stress of river flow on the foot of terrace and the inclination angel of terrace overruns 0. 377 N/m2 and 26°, respectively, the unconsolidated terrace will be eroded by outburst flow and collapse. It was strongly recommended for mitigation that identify and evade disastrous debris flows, reduce the junction angel of channels between river and watershed, build protecting wall for highway base and keep appropriate distance between highway and the edge of unconsolidated terrace.

关键词： Debris Flow Characteristics Hazard Chain Formation Condition Tianmo Watershed

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A method of determining nonlinear large strain consolidation parameters of dredged clays

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Water Science and Engineering 2014年第2期7卷 218-226页

作者： Yu-peng CAO Xue-song Wang Long DU jian-wen Ding yong-feng DENG Institute of Geotechnical Engineering Southeast University Municipal Facilities Authority Weifang Economic Development Zone

A method of obtaining the large strain consolidation parameters of dredged clays considering the influence of the initial water content is investigated in this study. According to the test results of remolded clays with high initial water contents reported by Hong et al. （2010）, a relationship between the void ratio （e） and effective stress （a3 is established. Furthermore, based on the available permeability data from the literature, a new relationship between the permeability coefficient （k） and the ratio （e/eL） of the void ratio to the void ratio at the liquid limit （eL） is proposed. The new proposed expression considering the initial water content improves the e-k equation established by Nagaraj et al. （1994）. Finally, the influence of the initial void ratio and effective stress on the large strain consolidation coefficient g（e） defined by Gibson et al. （1981） and k/（1 ＋e） in large strain analysis is discussed. The results show that, under a constant effective stress, the value of k/（1 ＋e） increases with the initial void ratio. The large strain consolidation coefficient shows the law of segmentation change, which decreases with the increase of the effective stress when the effective stress is less than the remolded yield stress, but increases rapidly with the effective stress when the effective stress is larger than the remolded yield stress.

关键词： initial void ratio permeability large strain consolidation parameter remolded yieldstress dredged clay

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Removal of PCDDs/Fs from municipal solid waste incineration by entrained-flow adsorption technology

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Journal of Zhejiang University-Science A(Applied Physics & Engineering) 2006年第11期7卷 1896-1903页

作者： YAN jian-hua peng Zheng LU Sheng-yong LI Xiao-dong CEN Ke-fa State Key Laboratory of Clean Energy Utilization Zhejiang University Hangzhou 310027 China

Entrained flow adsorption using activated carbon as the adsorbent is widely adopted for PCDDs/Fs-abatement in municipal solid waste incineration (MSWI) process. The effects of operating parameters including flue gas temperature, feeding rate of activated carbon, polychlorinated dibenzodioxins and polychlorinated dibenzofurans (PCDDs/Fs) concentration at the inlet of the air pollution control device (APCD), filter materials, pressure drop on PCDDs/Fs removal efficiency are reviewed and commented upon in this paper. Evaluation on the various mechanistic models for entrained flow adsorption is carried out based on the computational simulation in terms of the actual operating condition and theoretical analysis. Finally, an advancement of en- trained flow adsorption in combination of dual bag filter is introduced.

关键词： PCDDs/Fs Entrained flow adsorption Operating parameters Mechanistic model Dual bag filters

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Temperature-Dependent SRS Behavior of 316L and Its Constitutive Model

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Acta Metallurgica Sinica(English Letters) 2018年第3期31卷 234-244页

作者： jian peng jian peng Kai-Shang Li Jun-Feng Pei Chang-Yu Zhou School of Mechanical Engineering Changzhou UniversityChangzhou 213164 China jiangsu Key Laboratory of Green Process Equipment Changzhou University Changzhou 213164 China School of Mechanical and Power Engineering Nanjing TechUniversity Nanjing 210009 China

The strain rate sensitivity（SRS）and temperature sensitivity（TS）of 316L austenitic stainless steel were investigated by constant strain rate test（CSRT）and strain rate jump test（SRJT）under four temperatures（293,373,473 and 573 K）and four strain rates（5 ×10^-4/s,1 × 10^-3/s,5 × 10^-3/s and 1 × 10^-2/s）.The results show that temperature sensitivity（TS）indexes at different strain rates are coincidence to be negative,related to temperature *** the contrary,SRS indexes change from positive to negative with the increase in temperature associated with dynamic strain aging（DSA）.Moreover,based on the comparison between CSRT and SRJT,SRS and TS indexes obtained by two methods agree *** proves that the SRJT can describe the SRS and TS phenomenon of 316L ***,the effects of tem-perature and strain rate on fracture mechanism were *** last,an improved Johnson-Cook model was proposed to consider the temperature-dependent SRS behavior of 316L.

关键词： Strain rate sensitivity Strain rate jump test Improved Johnson-Cook model

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Multi-biological defects caused by lead exposure exhibit transferable properties from exposed parents to their progeny in Caenorhabditis elegans

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Journal of Environmental Sciences 2007年第11期19卷 1367-1372页

作者： WANG Da-yong YANG peng Department of Genetics and Developmental Biology Southeast University Nanjing 210009 China Key Laboratory of Developmental Genes and Human Disease Ministry of Education of China Nanjing 210009 China

Whether the multi-biological toxicity from lead exposure could be transferred to progeny has not been clarified. In the present study, we explored the Caenorhabditis elegans to analyze the multiple toxicities from lead exposure and their possibly transferable properties. The lead exposure could cause series of severe multi-biological defects with a concentration-dependent manner by affecting the endpoints of life span, development, reproduction and locomotion behaviors in nematodes. Moreover, most of these toxicities could be transferred to progeny from lead exposed animals and some of the defects in progeny appeared even more severe than in their parents, such as the body sizes and mean life spans. We summarized the defects caused by lead exposure into three groups according to their transferable properties or rescue patterns. That is, the defects caused by lead exposure could be largely, or partially, or became even more severe in progeny animals. Therefore, our results suggest that lead exposure can cause severely multi-biological defects, and most of these multiple toxicities can be considered as transferable for exposed animals in C. elegans.

关键词： lead exposure toxicity transferable phenotype behavior Caenorhabditis elegans

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Numerical experimental study on the potential climatic impacts oflarge-scale wind farms in China

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Advances in Climate Change Research 2019年第3期10卷 143-149页

作者： HUANG jian-Bin LOU peng-Kang SUN Hong-Wei LUO yong ZHAO Zong-Ci Ministry o f Education Key Laboratory for Earth System Modeling Department o f Earth System ScienceTsinghua University100084BeijingChina

Wind energy has been rapidly developed in China during the past decades and the installed capacity has been the largest in the world. In the future, utilization of wind power is still expected to carry out in China mainly with a large-scale centralized layout. Here, we examine the potential climatic impacts of large-scale windfarms associated with deployment scale in China using numerical experiments, in which four deployment scenarios were designed. These four scenarios represented relatively small- (484 GW), medium- (2165 GW) and large-scale (3490 GW and 5412 GW) installed wind power capacities, respectively. Results showed that turbulent kinetic energy, wind velocity, and air temperature varied consistently within those windfarms with the largest changes in turbine hub heights. Moreover, the above relatively large- scale windfarms could induce regional wanning with a maximum of above 0.8 °C in North China. This regional warming may be linked to an anomalous circulation pattern with a negative pressure anomaly center in Northeast China and a positive pressure anomaly center in the middle and lower reaches of the Yangtze-Huaihe River Basin.

关键词： Climatic impact Large-scale windfarms Wind energy China WRF model

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Multi-reservoir joint operating rule in inter-basin water transfer-supply project

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Science China(Technological Sciences) 2015年第1期58卷 123-137页

作者： peng AnBang peng yong ZHOU HuiCheng ZHANG Chi School of Hydraulic Engineering Dalian University of Technology

The joint operation of inter-basin water transfer-supply(IBWTS)project can be more complex when there is joint water demand in multi-reservoir system and multi-importing reservoirs simultaneously transferring water from exporting *** this study,a joint operating rule is proposed for the purpose of solving such complex operation *** rule is composed of a set of sub-rules,including hedging rule curves of virtual aggregation reservoir(*** reservoir)and other individual reservoirs,water-transfer rule curves of each individual reservoir,as well as some of important assisted *** assisted rules refer to allocation models for water *** the proposed rule,an equivalent reservoir is established to determine under what condition the water supply should be reduced and specify the total supplied water for joint water demand(*** method).Allocation models are developed to distribute the total transferred water into each importing reservoir and determine the water releases for joint water demand by each member reservoir of the aggregation system(*** method).And these models are integrated with a set of influence factors such as hydrologic characteristics,reservoir storage or vacant storage,regulating ability,water-supply pressure,and so *** aggregation of multi-reservoirs and the disaggregation of water quantities are taken into a whole consideration to reduce the complexity in reallocation of water target storage or water ***,the proposed rule is applied to the North-line IBWTS Project in Liaoning Province,*** results indicate that the proposed rule can take full advantage of hydrologic compensation in basins and capacity compensation in *** it can improve the utilization efficiency of water resources in system.

关键词： inter-basin water transfer joint operating rule equivalent reservoir water-transfer allocation water-supply allocation

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Magnetically recoverable Cu2O/Fe_3O_4 composite photocatalysts:Fabrication and photocatalytic activity

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Chinese Chemical Letters 2014年第2期25卷 287-291页

作者： Zuo-peng Li Ya-Qiong Wen jian-peng Shang Mei-Xia Wu Long-Fei Wang yong Guo Institute of Applied Chemistry Shanxi Datong University

A magnetically separable Cu2O/Fe3O4 magnetic composite photocatalyst was synthesized in large quantities by a fast and simple route. The as-prepared photocatalysts were characterized by scanning electron microscopy （SEM）, transmission electron microscopy （TEM）, X-ray photoelectron spectroscopy （XPS） and X-ray diffraction （XRD）. Furthermore, the Cu2O/Fe3O4 composite photocatalysts were tested using methyl orange （MO） degradation reaction under visible light irradiation （100 mW/cm2） and demonstrated to have a high photocatalytic efficiency toward the decomposition of MO under visible light irradiation with good recyclability.

关键词： Magnetic Photocatalyst Cu2O Degradation

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Denitrification potential enhancement by addition of external carbon sources in a pre-denitrification process

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Journal of Environmental Sciences 2007年第3期19卷 284-289页

作者： peng yong-zhen MA yong WANG Shu-ying School of Municipal and Environmental Engineering Harbin Institute of Technology Harbin 150090 China Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering Beijing University of Technology Beijing 100022 China

The aim of this study is to investigate the denitrification potential enhancement by addition of external carbon sources and to estimate the denitrification potential for the predenitrification system using nitrate utilization rate （NUR） batch tests. It is shown that the denitrification potential can be substantially increased with the addition of three external carbon sources, i.e. methanol, ethanol, and acetate, and the denitrification rates of ethanol, acetate, and methanol reached up to 9.6, 12, and 3.2 mgN/（g VSS.h）, respectively, while that of starch wastewater was only 0.74 mgN/（g VSS,h）. By comparison, ethanol was found to be the best external carbon source. NUR batch tests with starch wastewater and waste ethanol were carried out. The denitfification potential increased from 5.6 to 16.5 mg NO3-N/L owing to waste ethanol addition. By means of NUR tests, the wastewater characteristics and kinetic parameters can be estimated, which are used to determine the denitrification potential of wastewater, to calculate the denitrification potential of the plant and to predict the nitrate effluent quality, as well as provide information for developing carbon dosage control strategy.

关键词： predenitrification process external carbon addition ethanol denitrification potential

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Numerical simulation of the mechanical behavior of superconducting tape in conductor on round core cable using the cohesive zone model

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Applied Mathematics and Mechanics(English Edition) 2023年第9期44卷 1511-1532页

作者： Shengyi TANG Xubin peng Huadong yong Department of Mechanics and Engineering Sciences College of Civil Engineering and MechanicsLanzhou UniversityLanzhou 730000China Key Laboratory of Mechanics on Disaster and Environment in Western China Ministry of Education of ChinaLanzhou UniversityLanzhou 730000China Faculty of Civil Engineering and Mechanics Jiangsu UniversityZhenjiang 212013Jiangsu ProvinceChina

Cables composed of rare-earth barium copper oxide(REBCO)tapes have been extensively used in various superconducting *** recent years,conductor on round core(CORC)cable has drawn the attention of researchers with its outstanding current-carrying capacity and mechanical *** REBCO tapes are wound spirally on the surface of CORC *** extreme loadings,the REBCO tapes with layered composite structures are vulnerable,which can lead to degradation of critical current and even quenching of superconducting *** this paper,we simulate the deformation of CORC cable under external loads,and analyze the damage inside the tape with the cohesive zone model(CZM).Firstly,the fabrication and cabling of CORC are simulated,and the stresses and strains generated in the tape are extracted as the initial condition of the next ***,the tension and bending loads are applied to CORC cable,and the damage distribution inside the tape is *** addition,the effects of some parameters on the damage are discussed during the bending simulations.

关键词： high temperature superconducting(HTS)tape superconducting cable finite element simulation cohesive zone model(CZM) damage

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