检索结果-南通市图书馆

Contrast-Induced Nephropathy--Time for Western Medicine and Chinese Medicine to Team Up

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2018年第1期24卷 3-5页

作者： Svante Norgren gong xue-zhong Children's and Women's Health Theme Karolinska University Hospital SE-171 76 Stockholm Sweden Department of Nephrology Shanghai Municipal Hospital of Traditional Chinese Medicine Shanghai University of Traditional Chinese MedicineShanghai 200071 China

The cornerstones of the clinical management are prevention and identification of patients at risk, e.g. patients with diabetes, renal failure or heart *** therapy is the main line of prevention, and in addition severa... 详细信息

关键词： Contrast-Induced Nephropathy--Time Western Medicine and Chinese Medicine to Team Up

Cooperative beamforming design for physical-layer security of multi-hop MIMO communications

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2016年第6期59卷 153-166页

作者： Shiqi gong Chengwen XING Zesong fei Jingming KUANG School of Information and Electronics Beijing Institute of Technology

The security issue is critically important for wireless communications, especially for multi-hop communications. In this paper, we propose a cooperative secrecy beamforming scheme for a multi-hop MIMO communication network, in which there is a single-antenna source, multiple multi-antenna relays and a singleantenna destination. Moreover, two types of eavesdroppers exist in the network, one of which has known channel state information(CSI), while the other not. To achieve security communications, in our work null-space beamforming and artificial noise beamforming are jointly optimized to improve the secrecy rate of the multi-hop network. In nature, the joint optimization is nonconvex and challenging. Exploiting its structure, the considered optimization problem is decoupled into a series of subproblems that can be efficiently solved based on convex optimization theory. Finally, some numerical experiment results are provided to assess the performance of the proposed secrecy beamforming design.

关键词： MIMO physical layer security multi-hop network null-space beamforming artificial noise

Asymmetric chlorophyll responses enhanced by internal waves near the Dongsha Atoll in the South China Sea

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Oceanology and Limnology 2023年第2期41卷 418-426页

作者： Meilin WU Huijie xue fei CHAI State Key Laboratory of Marine Environmental Science College of Ocean and Earth SciencesXiamen UniversityXiamen 361102China State Key Laboratory of Tropical Oceanography South China Sea Institute of OceanologyChinese Academy of SciencesGuangzhou 510301China Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) Guangzhou 511458China Innovation Academy of South China Sea Ecology and Environmental Engineering Chinese Academy of SciencesGuangzhou 510301China

Internal waves(IWs)are small-scale physical processes that occur frequently in stratified marginal *** are ubiquitous and well documented in the northern South China Sea(n SCS),but few studies have explored the ecosystem responses to the *** chlorophyll-a(Chl-a)data from 2002 to 2014 were used to examine the distribution of Chl a near the Dongsha Atoll(DSA).Composite Chl a from about 40 IWs during spring and summer showed stronger response on the northern side than on the southern side of the *** day after the passage of IWs,composite surface Chl a on the northern side increased from 0.11 mg/m3 to a maximum mean value of 0.18 mg/*** decreased to 0.13 mg/m3 after two days and maintained that level for several days after the passage of *** enhanced surface Chl a likely caused subsurface Chl-a maximum and nutrients in the surface *** 64%of the increase in surface Chl a was due to the uplift of the subsurface Chl-a maximum one day after the passage of IWs,while nutrient-induced new phytoplankton growth contributed about 18%of the increase a few days *** the IWs occurred frequently in spring and summer,Chl-a level on the northern side was about 30%higher than that on the southern *** dissipation and its impact on nutrients and chlorophyll were stronger on the northern side of the DSA than on the south,which caused a north-south asymmetric distribution of Chl a in the region.

关键词： internal waves(IWs) phytoplankton nutrients Dongsha Atoll northern South China Sea

Investigations on Fluid Resonance Within A Narrow Gap Formed by Two Fixed Bodies with Varying Breadth Ratios

在线全文

学校读者我要写书评

暂无评论

China Ocean Engineering 2023年第6期37卷 962-974页

作者： gong Shu-kai GAO Jun-liang MAO Hong-fei School of Naval Architecture and Ocean Engineering Jiangsu University of Science and TechnologyZhenjiang 212100China State Key Laboratory of Hydraulic Engineering Intelligent Construction and Operation Tianjin UniversityTianjin 300350China College of Ocean Engineering and Energy Guangdong Ocean UniversityZhanjiang 524000China Guangdong Provincial Key Laboratory of Intelligent Equipment for South China Sea Marine Ranching Guangdong Ocean UniversityZhanjiang 524088China

The resonant motion of the fluid inside a narrow gap between two fixed boxes induced by incident regular waves with various wave heights is investigated by adopting a two-dimensional numerical wave flume based on an opensourced CFD package,*** two boxes have identical draft and height,but the upstream box has a variable *** article focuses on the influences of the breadth ratio,defined as the ratio of the breadth of the upstream box to that of the downstream box,on the following three aspects of hydrodynamic characteristics of gap resonance:(1)the wave height amplifications inside the gap,and in front and at the rear of the structure system,(2)the reflection,transmission,and energy loss coefficients of the structure system,and(3)the response and damping time of the fluid *** is found that the fluid resonant frequency,the amplification factor of the resonant wave height inside the gap and the maximum energy loss coefficient of the structure system are shown to gradually decrease with the increase of the breadth *** response time of gap resonance is shown to first increase and then decrease with the breadth ratio overall,regardless of the incident wave height,and the configuration that the two boxes have the same breadth would bring the largest response time of gap resonance.

关键词： gap resonance wave amplification varying breadth ratios OpenFOAM

Molecular dynamics study on surface formation and phase transformation in nanometric cutting of β-Sn

在线全文

学校读者我要写书评

暂无评论

Advances in Manufacturing 2022年第3期10卷 356-367页

作者： Zhi-Fu xue Min Lai fei-fei Xu Feng-Zhou Fang State Key Laboratory of Precision Measuring Technology and Instruments Laboratory of Micro-Nano Manufacturing TechnologyTianjin UniversityTianjin 300072People's Republic of China

Atomic motion and surface formation in the nanometric cutting process ofβ-Sn are investigated using molecular dynamics(MD).A stagnation region is observed that changes the shape of the tool edge involved in nanometric cutting,resulting in a fluctuation in the cutting *** is found that single-crystal tin releases the high compressive stress generated under the tool pressure through slip and phase *** tin transformation proceeds from aβ-Sn structure to a bct-Sn *** effects of the cutting speed,undeformed chip thickness(UCT)and tool edge radius on material removal are also explored.A better surface is obtained through material embrittlement caused by a higher *** addition,a smaller UCT and sharper tool edge help reduce subsurface damage.

关键词： β-Sn Molecular dynamics(MD) Nanometric cutting Surface formation Phase transformation

Effect of tempering on bonding characteristics of cross wedge rolling 42CrMo/Q235 laminated shafts

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2020年第10期27卷 1170-1178页

作者： Shuai Zhu Wen-fei Peng xue-dao Shu Zhejiang Provincial Key Laboratory of Part Rolling Technology Ningbo UniversityNingbo 315211ZhejiangChina

To further improve the comprehensive properties of 42CrMo/Q235 laminated shafts produced by cross wedge *** treatment of the shafts was *** and bending tests were carried out to compare the changes in mechanicalproperties before and after heat *** results showed that the interfacial bonding strength increased most aftertempering at 350℃for 45 *** microstructure of the interface was observed using a digital *** resultsshowed that the dispersed oxides on the interface were basically eliminated by using the scheme of tempering at 350 cand holding for 45 *** reasons for the change in mechanical properties were explained from the point of theinterfacial *** electron microscopy was used to analyze the micro-morphology of the tensile *** was observed that after tempering at 350℃and holding for 45 min,the dimple holes became larger and deeper,and thestructure of fracture became more uniform and *** the point of the tensile fracture *** reasons for thechange in mcchanical propcrties wcrc explained as well.

关键词： Heat treatment Cross wedge rolling Interface Microstructure Fracture morphology

Novel Incentive Scheme to Motivate Flexible Customers for Phase Balancing

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

CSEE Journal of Power and Energy Systems 2022年第4期8卷 1048-1059页

作者： Lurui Fang Kang Ma Furong Li fei xue Xi'an Jiaotong-liverpool University Suzhou 215123Chin University of Bath BathUK

Phase imbalance is a significant and widespread problem in low voltage(LV,415V)*** paper develops a novel incentive scheme that encourages flexible customers to engage in phase *** the technical side,this incentive scheme is based on a centralized control algorithm utilizing the inherent fexibility of customers'AC/DC converters to achieve phase balancing at the substation side of LV *** the incentive side,first,this paper calculates the benefits from phase *** then defines a rebalancing contribution index that quantifies the flexible customer's contribution to addressing the predominant imbalance-induced consequence,e.g,capacity wastes,and energy *** to the contribution indices and the benefits,the incentive scheme rewards flexible customers correspondingly and guides them to prioritize the predominant consequence of phase *** studies demonstrate that:1)the remunerations paid to the flexible customers primarily depends on their contributions to addressing the predominant imbalance-induced consequences for the network in question;2)the incentive scheme does not discriminate against small/medium-sized flexible customers who are dedicated to phase balancing,thus promoting inclusiveness.

关键词： Competition-based contribution index low voltage incentive scheme phase imbalance power distribution

A 3-D numerical simulation of the characteristics of open channel flows with submerged rigid vegetation

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2021年第4期33卷 833-843页

作者： Jun-tao Ren xue-fei Wu Ting Zhang School of Environment and Resource Southwest University of Science and TechnologyMianyang621010China

This paper applies the Flow-3D to investigate the impacts of different flow discharge and vegetation scenarios on the flow velocity (including the longitudinal, transverse and vertical velocities). After the verification by using experimental measurements, a sensitivity analysis is conducted for the vegetation diameter, the vegetation height and the flow discharge. For the longitudinal velocity, the greatest impact on the flow structure originates from the vegetation diameter, rather than the discharge. The vegetation height, however, determines the inflection point of the vertical distribution. Comparing the transverse velocities at two positions in the vegetated area, i.e., the upstream and the downstream, a symmetric pattern is identified along the water depth. The same pattern is also observed for the vertical velocity regardless of the flow or vegetation scenario, including both transverse and vertical fluid circulation patterns in the vegetated area. Moreover, the larger the vegetation diameter is, the more evident these patterns become. The upper circulation occurs near the vegetation canopy. These findings regarding the circulations along the transverse and vertical directions in the vegetated region shed light on the 3-D flow structure through the submerged vegetation.

关键词： Submerged rigid vegetation longitudinal velocity transverse velocity vertical velocity open channel

A Fusion Kalman Filter and UFIR Estimator Using the Influence Function Method

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IEEE/CAA Journal of Automatica Sinica 2022年第4期9卷 709-718页

作者： Wei xue Xiaoli Luan Shunyi Zhao fei Liu IEEE the Key Laboratory of Advanced Process Control for Light Industry(Ministry of Education) Institute of AutomationJiangnan University

In this paper,the Kalman filter(KF)and the unbiased finite impulse response(UFIR)filter are fused in the discrete-time state-space to improve robustness against *** avoid the problem where fusion filters may give up some advantages of UFIR filters by fusing based on noise statistics,we attempt to find a way to fuse without using noise *** fusion filtering algorithm is derived using the influence function that provides a quantified measure for disturbances on the resulting filtering outputs and is termed as an influence finite impulse response(IFIR)*** main advantage of the proposed method is that the noise statistics of process noise and measurement noise are no longer required in the fusion process,showing that a critical feature of the UFIR filter is *** numerical example and a practice-oriented case are given to illustrate the effectiveness of the proposed *** is shown that the IFIR filter has adaptive performance and can automatically switch from the Kalman estimate to the UFIR estimates according to operating ***,the proposed method can reduce the effects of optimal horizon length on the UFIR estimate and can give the state estimates of best accuracy among all the compared methods.

关键词： Fusion filter influence function Kalman filter(KF) robustness unbiased finite impulse response(FIR)