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Effects of soil amendments, foliar sprayings of silicon and selenium and their combinations on the reduction of cadmium accumulation in rice

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Pedosphere 2022年第4期32卷 649-659页

作者： demin li Hongyan liU Min GAO Jing ZHOU Jun ZHOU College of Agriculture Guizhou UniversityGuiyang 550025China Key Laboratory of Soil Environment and Pollution Remediation Institute of Soil ScienceChinese Academy SciencesNanjing 210008China University of Chinese Academy of Sciences Beijing 100049China National Engineering and Technology Research Center for Red Soil Improvement Red Soil Ecological Experiment StationChinese Academy of SciencesLiujiazhan PlantationYingtan 335211China

Agricultural soil contamination by cadmium (Cd) is becoming one of the most serious environmental issues and public concerns. In this study, factorial arrangements of treatments were designed to explore the effects of two soil amendments, sodium sulfide-biofuel ash (SSBA) and lime (0.1%), and three foliar applications, silicon (Si, 2.5 mmol L-1), selenium (Se, 40 mg L-1), and their combination (SS), on Cd reduction in rice (Oryza sativa L.) in a pot experiment, which were then verified in a field experiment. Compared with the control without amendment but with spraying of deionized water, both SSBA and lime significantly reduced concentrations of CaCl2-extractable Cd in soil by 30%–39% and 31%–40% and Cd in brown rice by 44%–63% and 53%–72% in the pot and field experiments, respectively. Foliar Si, Se, and SS applications significantly reduced Cd accumulation in brown rice by 62%–64%, 72%–83%, and 39%–73%, respectively, increased rice grain yield, and improved antioxidant enzyme activities in rice leaves but with different trends in the pot and field experiments. Combinations of SSBA and lime with Si, Se, and SS had a non-significant synergistic effect on Cd reduction in brown rice compared to only foliar spraying or soil amendment in both pot and field experiments, although SSBA + Se and SSBA + Si reduced Cd concentration in brown rice by 16%–34% and 14%–24% compared to only foliar Si and Se and soil SSBA applications, respectively. Soil lime application and foliar Si spraying were the most cost-effective strategies to reduce Cd accumulation in brown rice in the field and pot experiments, respectively. Although soil amendments and foliar treatments were individually effective, their combinations failed to generate a significant synergistic reduction of Cd concentration in brown rice.

关键词： antioxidant enzyme activity bioconcentration factor cadmium bioavailability rice yield soil contamination synergistic effect translocation factor

D-Tree Approach to Constructing Overlapping Location-Dependent Data Regions

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Tsinghua Science and Technology 2005年第z1期10卷 824-829页

作者： LAI liju li demin ZHANG Fan ZHU Ying XU Hao College of Information Science and Technology Donghua University Shanghai 200051 China College of Information Science and Technology Donghua University Shanghai 200051 China College of Information Science and Technology Donghua University Shanghai 200051 China College of Information Science and Technology Donghua University Shanghai 200051 China College of Information Science and Technology Donghua University Shanghai 200051 China

For the past few years, there has been an explosion in the number of individuals carrying wireless devices that are capable of conducting location-dependent information services (LDISs) and provide information based on locations specified in the queries. This paper examines the user's demand of vague queries, and then proposes system architecture of LDISs. In particular, based on D-tree index structure, it takes the method of membership function in fuzzy set theory to provide a more user-oriented approach to constructing overlapping location-dependent data regions, called complementary void overlapping data regions. This structure, carrying more information with less additional storage, brings balance between perceived usefulness and responsiveness, energy consumption, and bandwidth contention in wireless communications. The simulations show that this method is more flexible and practical in practice.

关键词： location-dependent information services (LDISs) index structure complementary void overlapping

Experimental Study on Interaction Between Degrees of Freedom in a Wave Buoy

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Journal of Ocean University of China 2019年第6期18卷 1256-1264页

作者： HUANG Shuting SHI Hongda CAO Feifei TAN Junzhe CHENG Haixun li demin liU Shangze GONG Haoxiang TAO Ji College of Engineering Ocean University of ChinaQingdao 266100China Shandong Provincial Key Laboratory of Ocean Engineering Qingdao 266100China

Increasing degrees of freedom(DOFs)is a useful way to raise the power capture efficiency of oscillating wave energy ***,this study proposes a buoy with three DOFs,which are surge,heave,and *** hydrodynamic performance and power capture efficiency of the buoy is physically *** of unidirectional and coupled motions are compared to analyze the interaction effect between freedoms under conditions with and without power take-off *** capture width ratio and corresponding growth rates are also *** show that the buoy makes a periodic sinusoidal(or approximate)movement in every *** effect can cause an increase in the amplitude in one DOF and a decrease in the amplitudes of the *** phenomenon shows that the kinematic energy of the buoy redistributes to all DOFs compared with the unidirectional *** DOFs can improve the power absorption of the buoy in most cases,but the number of DOFs is not the more the better.

关键词： wave energy oscillating buoy multiple degrees of freedom

Clinical significance of germline copy number variation in susceptibility of human diseases

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Journal of Genetics and Genomics 2018年第1期45卷 3-12页

作者： liwen Hu Xinyue Yao Hairong Huang Zhong Guo Xi Cheng Yang Xu Yi Shen Biao Xu demin li Department of Cardiothoracic Surgery Jinling Hospital School of Clinical Medicine Nanjing University Institute of Laboratory Medicine Jinling Hospital School of Clinical Medicine Nanjing University

Germline copy number variation （CNV） is considered to be an important form of human genetic poly- morphisms. Previous studies have identified amounts of CNVs in human genome by advanced technologies, such as comparative genomic hybridization, single nucleotide genotyping, and high-throughput sequencing. CNV is speculated to be derived from multiple mechanisms, such as nonallelic homologous recombination （NAHR） and nonhomologous end-joining （NHEJ）. CNVs cover a much larger genome scale than single nucleotide polymorphisms （SNPs）, and may alter gene expression levels by means of gene dosage, gene fusion, gene disruption, and long-range regulation effects, thus affecting individual phenotypes and playing crucial roles in human pathogenesis. The number of studies linking CNVs with common complex diseases has increased dramatically in recent years. Here, we provide a comprehensive review of the current understanding ofgermline CNVs, and summarize the association of germline CNVs with the susceptibility to a wide variety of human diseases that were identified in recent years. We also propose potential issues that should be addressed in future studies.

关键词： Copy number variation Susceptibility Risk Cancer Neuropsychological disorders

Channel Characteristics Based on Ray Tracing Methods in Indoor Corridor at 300 GHz

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Journal of Donghua University(English Edition) 2021年第3期38卷 221-230页

作者： ZHAI Kai ZHAI Menglin ZHANG Lei li demin College of Information Science and Technology Donghua UniversityShanghai 201620China Engineering Research Center of Digitized Textile and Apparel Technology Ministry of Education Donghua University Shanghai 201620 China

With the rapid development of communication technology,people's demand for ultra-high-speed wireless links becomes higher,among which terahertz spectra are considered as one of the most promising *** this paper,we analyze the channel characteristics at 300 GHz in indoor corridor based on ray tracing methods,including the large-scale and small-scale fading *** results show that it is suitable for short distance transmission due to its large path loss(PL).Firstly,compared with line-of-sight(LoS),the correlation of frequency components in non-line-of-sight(NLoS)is much better,but LoS has more abundant circle angular spread(CAS).Then,a stochastic model is well derived to describe the distance-dependent behaviour of root-mean-square delay spread(RMS-DS)as well as root-mean-square CAS(RMS-CAS).Besides,we find that the channel capacity can effectively increase by increasing the transmitted power in both LoS and ***,it can be seen that the RMS-DS can be significantly reduced in LoS and the channel capacity can increase by changing the position of the *** simulation results will provide references for future indoor communication.

关键词： terahertz channel characteristic ray tracing indoor corridor

A Hierarchical link Scheme in Multi-Hop VANETs with Delay Analysis for Congestion Scenario

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Journal of Computer and Communications 2016年第8期4卷 10-22页

作者： Yuanlin Yu demin li Guanglin Zhang Xiaolu Zhang College of Information Science and Technology Donghua University Shanghai China Engineering Research of Center of Digitized Textile and Apparel Technology Ministry of Education Shanghai China

Vehicular Ad-Hoc Networks (VANETs) as a part of intelligent transportation systems (ITS) are a new perspective to settle the traffic problem. Because of the high velocity, variational topology and such other characters, the link between VANETs and road side unit (RSU) is unstable. Besides, on account of the high cost of RSU, some places can’t be covered completely which make the Internet accessing difficult and accessing delay long. In this paper, we propose a hierarchical link scheme to help vehicles access the Internet based on delay analysis for congestion scenario. We select some moving accessing help points (AHPs) from vehicles in VANETs. Two different hierarchical schemes under the circumstances of whole road covered or not are proposed. When the RSUs are enough to cover the whole road fully, we propose the inward progressive hierarchical method. When the RSUs are not enough to cover the whole road, we propose the outward extend hierarchical method. According to the delay analysis, we can get the optimal hierarchy number. This hierarchical link scheme can decrease delay and make all vehicles access the Internet with delay guarantee. The simulation results indicate that our proposed hierarchical link scheme in VANETs can decrease the link delay effectively.

关键词： VANETs Hierarchical link Scheme Delay Congestion Scenario

多微电网系统的合作博弈模型及其优化调度策略

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中国电机工程学报 2022年第14期42卷 5140-5153页

作者：李得民吴在军赵波东南大学电气工程学院江苏省南京市210096 国网浙江省电力有限公司电力科学研究院浙江省杭州市310014

该文将多微电网系统中的所有微电网设为地位对等的能量管理实体,赋予每个微电网与其他微电网功率交易的定价权和交易电量决定权,构建不含中央管理单元的分布式能量管理架构。提出关于电价和功率交易量的约束协议,建立多微电网系统的合... 详细信息

该文将多微电网系统中的所有微电网设为地位对等的能量管理实体,赋予每个微电网与其他微电网功率交易的定价权和交易电量决定权,构建不含中央管理单元的分布式能量管理架构。提出关于电价和功率交易量的约束协议,建立多微电网系统的合作博弈模型,并提出效益妥协算法,使所有微电网通过效益妥协的方式接受彼此制定的能量调度策略,以统一多微电网系统的能量管理方案。结果表明,按照约束协议找到的电价策略是唯一不损害所有微电网利益的电价集合,基于该电价策略执行效益妥协过程得到的微电网间的功率交易方案是在兼顾所有微电网利益的前提下,唯一使所有微电网都接受的能量调度方案,验证了该文建立的合作博弈模型可有效实现多微电网系统的分布式能量管理。

关键词：多微电网分布式能量管理约束协议合作博弈效益

A Cooperative Location Management Scheme for Mobile Ad Hoc Networks

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International Journal of Communications, Network and System Sciences 2009年第8期2卷 732-741页

作者： demin li Jiacun WANG liping ZHANG Hao li Jie ZHOU 不详

A mobile ad hoc network (MANET) is a kind of wireless ad hoc network. It is a self-configuring network of mobile routers connected by wireless links. Since MANETs do not have a fixed infrastructure, it is a chal-lenge to design a location management scheme that is both scalable and cost-efficient. In this paper, we propose a cooperative location management scheme, called CooLMS, for MANETs. CooLMS combines the strength of grid based location management and pointer forwarding strategy to achieve high scalability and low signaling cost. An indepth formal analysis of the location management cost of CooLMS is presented. In particular, the total location management cost of mobile nodes moving at variable velocity is estimated using the Gauss_Markov mobility model for the correlation of mobility velocities. Simulation results show CooLMS performs better than other schemes under certain circumstances.

关键词： Ad hoc Network Grid Home Region Location Management Forwarding Pointer Cost Estimation

The Next-Hop Node Selection Based GPSR in Vehicular Ad Hoc Networks

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Journal of Computer and Communications 2016年第10期4卷 44-56页

作者： Zhaoyuan Cui demin li Guanglin Zhang Chang Guo Yong Sheng College of Information Science and Technology Donghua University Shanghai China Engineering Research of Center of Digitized Textile and Apparel Technology Ministry of Education Shanghai China

Vehicular Ad hoc Networks (VANETs) which is a special form of Mobile Ad hoc Networks (MANETs) has promising application prospects in the future. Due to the rapid changing of topology structure, how to find a route which can guarantee Quality of Service (QoS) is an important issue in VANETs. This paper presents an improved Greedy Perimeter Stateless Routing (GPSR) protocol based on our proposed next-hop node selection mechanism. Firstly, we define the link reliability in two cases which take the movement direction angle between two vehicles into consideration. Then we propose a next-hop node selection mechanism based on a weighted function which consists of link reliability between the sender node and next-hop candidate node, distance between next-hop candidate node and the destination, movement direction angle of next-hop candidate node. At last, an improved GPSR protocol is proposed based on the next-hop node selection mechanism. Simulation results are presented to evaluate the performance of the improved GPSR protocol, which shows that the performance including packet delivery ratio and average end-to-end delay of the proposed protocol is better in some situations.

关键词： VANETs GPSR Next-Hop Node Selection link Reliability Weighted Function