检索结果-南通市图书馆

Journal of Wuhan University of Technology(Materials Science) 2025年第1期40卷 232-239页

作者： liu Peng mao Junpeng FANG Yanfeng YU Yunwu CHEN Changxiu TANG Ning WAN ye GU Yaxin liu Yunxue WANG Lihua School of Materials Science and Engineering Shenyang Jianzhu UniversityShenyang 110168China

A new modified blend ultrafiltration(UF)membrane with good hydrophilicity,high porosity and excellent anti-fouling performance was developed by using carboxylic multi-walled carbon nanotube(CMWCNT)as casting solution ***,a composite nanofiltration(NF)membrane with large water flux and good retention rate was fabricated by using the PVDF/CMWCNT blend UF membrane as the substrate,and polyvinyl alcohol(PVA),β-cyclodextrin(β-CD)and polyethylenimine(PEI)as the coating *** results show that with the appropriate addition of CMWCNT in the casting solution,the surface roughness,porosity and recovery rate of the PVDF/CMWCNT blend UF membrane is obviously *** water flux of blend UF membrane is significantly improved when the CMWCNT content increases from 0 wt%to 0.2 wt%.The water flux of blend UF membrane with 0.2 wt%CMWCNT is 162.7 L/(m^(2)·h),which is 44.3%higher than that of the pure PVDF ***β-CD content is 0.8 wt%,the retention rate of Congo red by PVDF/CMWCNT/β-CD composite NF membrane reaches 98.7%,which is 28.3%higher than that of single PVA/PEI modified *** research will provide a new idea and simple method for developing novel high-performance composite NF membranes.

关键词： CMWCNT cyclodextrin nanofiltration membrane

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

基于快速地标采样的大规模谱聚类算法

电子与信息学报 2017年第2期39卷 278-284页

作者：叶茂刘文芬解放军信息工程大学郑州450002 数学工程与先进计算国家重点实验室郑州450002

为避免传统谱聚类算法高复杂度的应用局限,基于地标表示的谱聚类算法利用地标点与数据集各点间的相似度矩阵,有效降低了谱嵌入的计算复杂度。在大数据集情况下,现有的随机抽取地标点的方法会影响聚类结果的稳定性,k均值中心点方法面临... 详细信息

为避免传统谱聚类算法高复杂度的应用局限,基于地标表示的谱聚类算法利用地标点与数据集各点间的相似度矩阵,有效降低了谱嵌入的计算复杂度。在大数据集情况下,现有的随机抽取地标点的方法会影响聚类结果的稳定性,k均值中心点方法面临收敛时间未知、反复读取数据的问题。该文将近似奇异值分解应用于基于地标点的谱聚类,设计了一种快速地标点采样算法。该算法利用由近似奇异向量矩阵行向量的长度计算的抽样概率来进行抽样,同随机抽样策略相比,保证了聚类结果的稳定性和精度,同k均值中心点策略相比降低了算法复杂度。同时从理论上分析了抽样结果对原始数据的信息保持性,并对算法的性能进行了实验验证。

关键词：地标点采样大数据谱聚类近似奇异值分解

维普期刊数据库

Overview and Prospect of Distributed Energy P2P Trading

在线全文

学校读者我要写书评

暂无评论

Energy Engineering 2025年第1期122卷 379-404页

作者： Jiajia liu Mingxing Tian Xusheng mao School of Automation and Electrical Engineering Lanzhou Jiaotong UniversityLanzhou730070China

After a century of relative stability in the electricity sector,the widespread adoption of distributed energy resources,along with recent advancements in computing and communication technologies,has fundamentally altered how energy is consumed,traded,and *** change signifies a crucial shift as the power system evolves from its traditional hierarchical organization to a more decentralized *** the heart of this transformation are innovative energy distribution models,like peer-to-peer(P2P)sharing,which enable communities to collaboratively manage their energy *** effectiveness of P2P sharing not only improves the economic prospects for prosumers,who generate and consume energy,but also enhances energy resilience and *** allows communities to better leverage local resources while fostering a sense of collective responsibility and collaboration in energy ***,there is still no extensive implementation of such sharing models in today’s *** on distributed energy P2P trading is still in the exploratory stage,and it is particularly important to comprehensively understand and analyze the existing distributed energy P2P trading *** paper contributes with an overview of the P2P markets that starts with the network framework,market structure,technical approach for trading mechanism,and blockchain technology,moving to the outlook in this field.

关键词： Distributed energy P2P market mechanisms classification and comparison

Three-dimensional fracture of UO2 ceramic pellets by phase field modeling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 169-180页

作者： Wei Xiong Xuan ye Hongzhang Cheng Xiaoming liu Institute of Nuclear and New Energy Technology Collaborative Innovation Center of Advanced Nuclear Energy Technology Key Laboratory of Advanced Reactor Engineering and Safety of Ministry of Education Tsinghua University State Key Laboratory of Nonlinear Mechanics Institute of Mechanics Chinese Academy of Sciences School of Engineering Science University of Chinese Academy of Sciences

Fracture is the primary failure type for the UO2ceramic pellets,which are operated under irradiation and thermal processes,and physically confined by the *** this work,by combining closely coupled physical processes of heat conduction,heat transfer,and mechanical deformation with the cohesive phase field framework,we proposed a high-precision modeling of quasistatic cracking of three-dimensional （3D） UO2ceramic fuel pellets under high temperature and *** simulation results agree well with the experimental results,indicating that the proposed method has the potential to capture 3D crack modes in the interested time ***,we studied the relation of the 3D fracture patterns of fuel pellets with the peak power *** was found that the power level plays a critical role in determining the competition between radial and circumferential cracks,as well as transverse penetrating cracks.

关键词： phase field method nuclear fuel pellet coupled thermo-mechanical model thermal fracture

Robust Asymptotic Inference for Mean and Covariance Structure Model.

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Robust Asymptotic Inference for Mean and Covariance Structur...

The burden of upper motor neuron involvement is correlated with the bilateral limb involvement interval in patients with amyotrophic lateral sclerosis:a retrospective observational study

江苏省现场统计研究会第11次学术年会

作者： ye-mao Xia and Yin-An liu Department of applied mathematics The Nanjing Forestry University

＜正＞Mean and covariance structure model is widely applied in behavioral,educational, medical,social and psychological *** classic maximum likelihood estimate is vulnerable to outliers and distributional *** this paper,robust estimate based on the minimizing the objective function is proposed,and M-ratio test based on the robust deviance is suggested to assess the model *** results are illustrated by simulation studies and a real example.

关键词： Mean and covariance structure model Good-of-fitness Robust deviance

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第5期20卷 1505-1512页

作者： Jieying Wu Shan ye Xiangyi liu Yingsheng Xu Dongsheng Fan Department of Neurology Peking University Third HospitalBeijingChina Beijing Municipal Key Laboratory of Biomarker and Translational Research in Neurodegenerative Diseases BeijingChina Key Laboratory for Neuroscience National Health Commission/Ministry of EducationPeking UniversityBeijingChina

Amyotrophic lateral sclerosis is a rare neurodegenerative disease characterized by the involvement of both upper and lower motor *** bilateral limb involvement significantly affects patients'daily lives and may lead them to be confined to ***,the effect of upper and lower motor neuron impairment and other risk factors on bilateral limb involvement is *** address this issue,we retrospectively collected data from 586 amyotrophic lateral sclerosis patients with limb onset diagnosed at Peking University Third Hospital between January 2020 and May 2022.A univariate analysis revealed no significant differences in the time intervals of spread in different directions between individuals with upper motor neuron-dominant amyotrophic lateral sclerosis and those with classic amyotrophic lateral *** used causal directed acyclic graphs for risk factor determination and Cox proportional hazards models to investigate the association between the duration of bilateral limb involvement and clinical baseline characteristics in amyotrophic lateral sclerosis *** factor analyses revealed that higher upper motor neuron scores(hazard ratio[HR]=1.05,95%confidence interval[CI]=1.01–1.09,P=0.018),onset in the left limb(HR=0.72,95%CI=0.58–0.89,P=0.002),and a horizontal pattern of progression(HR=0.46,95%CI=0.37–0.58,P<0.001)were risk factors for a shorter interval until bilateral limb *** results demonstrated that a greater degree of upper motor neuron involvement might cause contralateral limb involvement to progress more quickly in limb-onset amyotrophic lateral sclerosis *** findings may improve the management of amyotrophic lateral sclerosis patients with limb onset and the prediction of patient prognosis.

关键词： amyotrophic lateral sclerosis bilateral limb involvement Cox proportional hazards regression model horizontal spread restricted cubic spline analysis time interval upper motor neuron vertical spread

维普期刊数据库

Constraints on what controls millennial-scale basin-wide denudation across mountain belts, Asia

在线全文

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 74-93页

作者： ye YANG Steven A.BINNIE Sheng XU Cong-Qiang liu Tibor J.DUNAI Institute of Surface-Earth System Science School of Earth System Science Tianjin University Institute of Geology and Mineralogy University of Cologne

The terrestrial cosmogenic nuclide dataset consisting of 123310Be measurements of fluvial sediment samples across the Asian mountain belts is used to constrain the influence of climate,tectonics and topography on Earth-surface denudation processes.10Be-derived basin-wide denudation rates were recalculated using a Monte Carlo simulation approach that relied on pixel-by-pixel production *** rates derived span four orders of magnitude,from 7.4±0.7 mm kyr-1（1σ;Central Tibetan Plateau） to 9,646744+777mm kyr-1（1σ;Southern Tibetan Plateau）,with a median of 186 mm *** our results with the traditional basin-wide production rate scaling model using a centroid coordinate and mean elevation,suggests that 96.6%of production rates will be underestimated using the latter method,especially for basins with a large *** bias between both methods reaches as large as 40%,caused by basin hypsometry and the nonlinear scaling of production rate with elevation and *** of the correlations between uniformly recalculated denudation rates and tectonics,climate,topography and rock lithology will facilitate the extrapolation of denudation rates in unknown basins using available *** the perspective of local scales,precipitation coupled with neotectonics-driven landslides is likely the most influential factor in subtropical Taiwan Island,while topography primarily constrains surface denudation rates in the eastern Tibetan Plateau within a narrow range of *** highland regions with glacier coverage,such as the Pamir,central and southern Tibetan Plateau high denudation rates are affected by glaciation,whereas lower precipitation and high erosion base level may limit river incision and evolving relief in the Central Tibetan *** contrast to local-scale findings highlighting a dominant factor constraining denudation rate,our large-scale quantitative analyses across the Asian mountain belts finds that （1） topographic metrics including

关键词： 10Be-derived denudation rate Climate change Tectonic uplift Topographic gradient Asian mountains

Poly(lactic acid)/Poly(butylene adipate-co-terephthalate)films with simultaneous high oxygen barrier and fast degradation properties

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Green Energy & Environment 2025年第1期10卷 1-10页

作者： Mengjing Yang Yuxi mao Penghui Zhang Jie Li Zeming Tong Zhenguo liu Yanhui Chen Institute of Flexible Electronics Northwestern Polytechnical UniversityXi'an710072China Key Laboratory of Flexible Electronics of Zhejiang Province Ningbo Institute of Northwestern Polytechnical University218 Qingyi RoadNingbo315103China School of Chemistry and Chemical Engineering Shaanxi Key Laboratory of Macromolecular Science and TechnologyKey Laboratory of Special Functional and Smart Polymer Materials of Ministry of Industry and Information TechnologyNorthwestern Polytechnical UniversityXi'an 710072China

Although poly(lactic acid)(PLA)is a good environmentally-friendly bio-degradable polymer which is used to substitute traditional petrochemical-based polymer packaging films,the barrier properties of PLA films are still insufficient for high-barrier packaging *** this study,oxygen scavenger hydroxyl-terminated polybutadiene(HTPB)and cobalt salt catalyst were incorporated into the PLA/poly(butylene adipate-co-terephthalate)(PLA/PBAT),followed by melting extrusion and three-layer co-extrusion blown film process to prepare the composite *** oxygen permeability coefficient of the composite film combined with 6 wt%oxygen scavenger and 0.4 wt%catalyst was decreased significantly from 377.00 cc·mil·m^(-2)·day^(-1)·0.1 MPa^(-1) to 0.98 cc·mil·m^(-2)·day^(-1)·0.1 MPa^(-1),showing a remarkable enhancement of 384.69 times compared with the PLA/PBAT composite ***,the degradation behavior of the composite film was also accelerated,exhibiting a mass loss of nearly 60%of the original mass after seven days of degradation in an alkaline environment,whereas PLA/PBAT composite film only showed a mass loss of 32%.This work has successfully prepared PLA/PBAT composite films with simultaneously improved oxygen barrier property and degradation behavior,which has great potential for high-demanding green chemistry packaging industries,including food,agricultural,and military packaging.

关键词： Barrier property Oxygen scavenging Blow molding Eco-packaging Degradable composite film

No significant association between dipeptidyl peptidase-4 inhibitors and adverse outcomes of COVID-19

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Clinical Cases 2020年第22期8卷 5576-5588页

作者： Jiang-Hua Zhou Bin Wu Wen-Xin Wang Fang Lei Xu Cheng Juan-Juan Qin Jing-Jing Cai Xiao-Jing Zhang Feng Zhou ye-mao liu Hao-Miao Li Li-Hua Zhu Zhi-Gang She Xin Zhang Juan Yang Hong-Liang Li Department of Cardiology Renmin Hospital of Wuhan UniversityBasic Medical SchoolWuhan UniversityWuhan 430071Hubei ProvinceChina Basic Medical School Institute of Model AnimalWuhan UniversityWuhan 430071Hubei ProvinceChina Department of Cardiology the 3rd Xiangya HospitalCentral South UniversityChangsha 410013Hunan ProvinceChina Medical Science Research Center Zhongnan Hospital of Wuhan UniversityInstitute of Model AnimalWuhan UniversityWuhan 430072Hubei ProvinceChina Department of Cardiology Renmin Hospital of Wuhan UniversityInstitute of Model Animal of Wuhan UniversityWuhan 430071Hubei ProvinceChina Institute of Model Animal Wuhan UniversityDepartment of GastroenterologyWuhan Third HospitalTongren Hospital of Wuhan UniversityWuhan 430072Hubei ProvinceChina

BACKGROUND Dipeptidyl peptidase-4(DPP4)is commonly targeted to achieve glycemic control and has potent anti-inflammatory and immunoregulatory *** structural analyses indicated a potential tight interaction between DPP4 and severe acute respiratory syndrome coronavirus 2(SARS-CoV-2),raising a promising hypothesis that DPP4 inhibitor(DPP4i)drugs might be an optimal strategy for treating coronavirus disease 2019(COVID-19)among patients with ***,there has been no direct clinical evidence illuminating the associations between DPP4i use and COVID-19 *** To illuminate the associations between DPP4i usage and the adverse outcomes of *** We conducted a multicenter,retrospective analysis including 2563 patients with type 2 diabetes who were hospitalized due to COVID-19 at 16 hospitals in Hubei Province,*** excluding ineligible individuals,142 patients who received DPP4i drugs and 1115 patients who received non-DPP4i oral anti-diabetic drugs were included in the subsequent *** performed a strict propensity score matching(PSM)analysis where age,sex,comorbidities,number of oral hypoglycemic agents,heart rate,blood pressure,pulse oxygen saturation(SpO2)<95%,CT diagnosed bilateral lung lesions,laboratory indicators,and proportion of insulin usage were ***,111 participants treated with DPP4i drugs were successfully matched to 333 non-DPP4i ***,a linear logistic model and mixed-effect Cox model were applied to analyze the associations between inhospital DPP4i use and adverse outcomes of *** After rigorous matching and further adjustments for imbalanced variables in the linear logistic model and Cox adjusted model,we found that there was no significant association between in-hospital DPP4i use(DPP4i group)and 28-d allcause mortality(adjusted hazard ratio=0.44,95%CI:0.09-2.11,P=0.31).Likewise,the incidences and risks of secondary outcomes,including septic shock,acute respiratory distress synd

关键词： COVID-19 SARS-CoV-2 DPP4 inhibitors Diabetes Glucose control Adverse effects

Simulations of electron zebra stripes in the inner radiation belt using a composite empirical electric field model

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Science China Earth Sciences 2025年第1期68卷 27-38页

作者： Ziyang WANG Ying liu Qiugang ZONG Hong ZOU Yuguang ye Xuzhi ZHOU Chao YUE Shan WANG Institute of Space Physics and Applied Technology Peking University State Key Laboratory of Lunar and Planetary Science Macau University of Science and Technology

The phenomenon termed “zebra stripes” manifests as regular patterns in the energy-space(L shell) spectrum of energetic electrons(ranging from tens to hundreds ke V) within the inner radiation belt. These structures exhibit drift-periodic behavior and commonly arise from large-scale electric field perturbations near the substorm onsets. In this study, we introduce a composite electric field model and replicate the formation, structure, and evolution of zebra stripes using a bounce-averaged test particle code under this electric field model. High-resolution measurements of energetic electrons obtained from the Van Allen Probes and the recently launched Macao Science Satellites-1 are used as initial conditions and served to validate our test particle simulations. Comparative analyses between observed data and simulations demonstrate our test particle method's efficacy in capturing zebra stripes' general behavior. Moreover, the composite model proves capable of reproducing realistic variations in the electric field within the inner radiation belt to a certain extent. Nevertheless, subtle differences emerge in the flux strength and the positions of stripes. These disparities primarily stem from limitations inherent in the electric field model and the initial conditions of the simulation. Acknowledging that the model represents an average case, it is conceivable that real-world scenarios may deviate from the average, thereby introducing variations in the observed phenomena.

关键词： Zebra stripes Inner radiation belt Large-scale electric fields Van Allen Probes Macao Science Satellite