检索结果-南通市图书馆

Journal of Thermal Science 2024年第2期33卷 591-601页

作者： WANG Zhaowen ZHOU Hao LUO Jiawei LI Yawei FANG Hao liu tianxiao State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

This paper studied the thermal physical properties of foundation materials in the molten salt tank of thermal energy storage system after molten salt leakage by Transient plane source experiment and X-ray computed microtomography simulation *** microstructure,thermal properties and pressure resistance with different particle diameters were *** measured heat conductivities from Transient plane source experiment for three cases are 0.49 W/(m·K),0.48 W/(m·K),and 0.51 W/(m·K),and the porosity is 30.1%,30.7%,and 31.2% *** heat conductivity simulating results of three cases are 0.471 W/(m·K),0.482W/(m·K),and 0.513 W/(m·K).The ratio of difference between the results of simulation and Transient plane source measurement is as low as 1.2%,verifying the reliability of experimental and simulation results to a certain *** with the heat conductivity of 0.097-0.129 W/(m·K) and porosity of 71.6%-78.9% without leaking salt,the porosity is reduced by more than 50% while the heat conductivity increased by 4 to 5 times after molten salt *** significant increase in heat conductivity has a great impact on security operation,structure design,and modeling of the tank foundation for solar power plants.

关键词： heat conductivity X-ray computed microtomography foundation materials three-phase threshold algorithm molten salt leakage

Efficient and stable organic solar cells enabled by a poly(carbazole phosphonic acid)hole transporter

在线全文

学校读者我要写书评

暂无评论

Science China Chemistry 2024年第6期67卷 1941-1945页

作者： Zhijun Ren Siwei Luo Xiaoyu Shi Yunjie Dou tianxiao liu Lingyuan Wang Kwok Kiu Tsang Feifei Wang Yu Zhao Yangyang liu Xiaodong Hu Xiaoxiao Peng Wei liu He Yan Shangshang Chen State Key Laboratory of Coordination Chemistry MOE Key Laboratory of High Performance Polymer Materials&TechnologySchool of Chemistry and Chemical EngineeringNanjing UniversityNanjing210023China Department of Chemistry Guangdong-Hong Kong-Macao Joint Laboratory of Optoelectronic and Magnetic Functional MaterialsEnergy Institute and Hong Kong Branch of Chinese NationalEngineering Research Center for Tissue Restoration and ReconstructionHong Kong University of Science and TechnologyHong Kong999077China

Conventional self-assembled monolayer(SAM)hole transporters in organic solar cells(OSCs)generally suffer from poor uniformity and limited thickness tolerance,hindering their large-scale *** overcome these limitations,we introduce a novel polymeric hole transporter synthesized by polymerizing carbazole phosphonic acid(PACz).The resultant Poly-2PACz material exhibits exceptional conductivity,high tolerance for variations in layer thickness,and improved film uniformity compared with conventional ***,the OSCs utilizing Poly-2PACz achieve a remarkable power conversion efficiency of 19.1%and a high fill factor of 81.2%,surpassing the devices based on ***,Poly-2PACz-based OSCs demonstrate excellent operational stability,retaining over 80%of their initial efficiency after 1,400 h of continuous light exposure in ambient *** work presents a novel strategy for designing hole transporters,paving the way for more efficient and stable OSCs.

关键词： organic solar cells hole transporters poly(carbazole phosphonic acid) stability

Flow Stealer: lightweight load balancing by stealing flows in distributed SDN controllers

在线全文

学校读者我要写书评

暂无评论

Science China(Information Sciences) 2017年第3期60卷 123-138页

作者： Ping SONG Yi liu tianxiao liu Depei QIAN Sino-German Joint Software Institute Beihang University Beijing Key Laboratory of Network Technology

Software-defined networking(SDN) introduces centralized controllers to increase network programmability drastically. Distributed control planes, in which multiple SDN controllers work together to manage a network, have been proposed to satisfy the requirements of large-scale networks, and different kinds of load-balancing approaches have been proposed to balance the workloads among these controllers. Current load-balancing approaches generally use switch migration, which adjusts the mapping between switches and controllers dynamically according to controller workloads. These switch migration-based approaches face challenges under burst traffic as a result of their overhead and longer detection periods. This paper proposes Flow Stealer,a lightweight load-balancing method for distributed SDN controllers. Flow Stealer uses a low-cost flow-stealing method, in which idle controllers share workloads temporarily with overloaded controllers by stealing flow events from them. The flow-stealing method not only can react to changes of network traffic more quickly, but can also reduce the frequency of switch migration. In addition, Flow Stealer incorporates both flow stealing and switch migration to adapt to burst traffic and long-term traffic changes. Experimental results show that Flow Stealer can balance the workloads among controllers more efficiently, especially under burst traffic.

关键词： software defined networking load balancing flow stealing distributed controller switch migration

乳腺AI与钼靶在乳腺结节定性诊断及术前指导中的应用价值

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国医学创新 2024年第24期21卷 139-142页

作者：李琪李丰章刘天笑萍乡市人民医院影像科江西萍乡337000

目的:观察乳腺人工智能(AI)与钼靶在乳腺结节定性诊断及术前指导中的应用价值。方法:选取2019年1月—2023年6月萍乡市人民医院收治的乳腺结节患者164例,对所有患者行乳腺AI检查及乳腺钼靶检查,以病理诊断结果为金标准,比较乳腺AI、钼靶... 详细信息

目的:观察乳腺人工智能(AI)与钼靶在乳腺结节定性诊断及术前指导中的应用价值。方法:选取2019年1月—2023年6月萍乡市人民医院收治的乳腺结节患者164例,对所有患者行乳腺AI检查及乳腺钼靶检查,以病理诊断结果为金标准,比较乳腺AI、钼靶及两者联合对乳腺结节定性诊断及术前指导的价值。结果:164例患者中,经手术病理结果发现174个乳腺结节,共136个良性病变(纤维腺瘤54例,乳腺病26例,肉芽肿性小叶性乳腺炎52例,单纯性囊肿4例),38个恶性病变(浸润性导管癌14例,乳头状癌12例,导管原位癌12例)。乳腺AI检查定性诊断乳腺结节的敏感度、特异度及准确性分别为73.68%、91.17%及87.36%;乳腺钼靶检查为57.89%、85.29%及79.31%;两者联合敏感度及准确性分别为89.47%、91.95%,均显著高于单独诊断,差异均有统计学意义(P<0.05)。结论:乳腺AI联合钼靶检测能显著提高乳腺结节定性诊断效能,对于乳腺结节术前评估价值较高。

关键词：乳腺AI 乳腺钼靶乳腺结节定性诊断术前指导

Analysis of Flowing and Heat Transfer of Commercial Molten Nitrate in Porous Foundation Material

在线全文

学校读者我要写书评

暂无评论

Journal of Thermal Science 2023年第4期32卷 1455-1465页

作者： SHI Hua ZHOU Hao MENG Hanxiao LV Laiquan liu tianxiao ZUO Yuhang CEN Kefa State Key Laboratory of Clean Energy Utilization Institute for Thermal Power EngineeringZhejiang UniversityHangzhou310027China

The leakage accident of molten salt in the thermal storage tank will cause the shutdown and enormous economic losses of Concentrated Solar Power *** study investigates the heat transfer and flow characteristic of commercial molten nitrates leaking in the thermal state porous foundation *** migration width and depth of three molten nitrates,Solar Salt(60 wt%NaNO_(3)-40 wt%KNO_(3)),Hitec XL(7 wt%NaNO_(3)-45 wt%KNO_(3)-48 wt%Ca(NO_(3))_(2))and Hitec(7 wt%NaNO_(3)-53 wt%KNO_(3)-40 wt%NaNO_(2)),are obtained at different operating *** results indicate that the temperature rising rate of foundation material in the nitrate leaking process has a trend of first increasing rapidly and then decreasing,and then it increases slightly as the depth *** temperature rising rate increases obviously with increasing operating temperature of the molten *** the increase of the operating temperature,the distances from the storage tank bottom to solid salt in foundation and the total migration depths both increase obviously,while the average migrating widths change *** the same operating temperature,the temperature rising rate of the foundation material where Hitec XL and Hitec salt leak is significantly greater than that with Solar Salt,which is closely related to the melting points of molten *** migration depth of Hitec is 95.03%greater than that of Solar Salt and 19.11%larger than that of Hitec XL at the operating temperature of 300℃.Compared with Hitec XL,the leakage of Hitec with a smaller viscosity has a larger temperature rising rate and a wider and deeper transporting range during the leakage *** work could guide the installation locations of the leak detection devices for high temperature storage tank and the environmental treatment of leaking accident.

关键词： nitrate foundation material leaking flow heat transfer

Dynamic regulation of the irrigation-nitrogen-biochar nexus for the synergy of yield,quality,carbon emission and resource use efficiency in tomato

在线全文

学校读者我要写书评

暂无评论

Journal of Integrative Agriculture 2024年第2期23卷 680-697页

作者： Ping’an Zhang Mo Li Qiang Fu Vijay PSingh Changzheng Du Dong liu tianxiao Li Aizheng Yang School of Water Conservancy&Civil Engineering Northeast Agricultural UniversityHarbin 150030China Key Laboratory of Effective Utilization of Agricultural Water Resources Ministry of Agriculture and Rural Affairs/Northeast Agricultural UniversityHarbin 150030China Department of Biological and Agricultural Engineering&Zachry Department of Civil&Environmental Engineering Texas A&M UniversityTX 77843-117USA National Water and Energy Center UAE UniversityAI Ain999041United Arab Emirates Heilongjiang Agricultural Engineering Vocational College Harbin 150030China

Integrated water and fertilizer management is important for promoting sustainable development of facility agriculture,and biochar plays an important role in guaranteeing food production,as well as alleviating water shortages and the overuse of *** field experiment had twelve treatments and a control(CK)trial including two irrigation amounts(I1,100%ETm;I2,60%ETm;where ETm is the maximum evapotranspiration),two nitrogen applications(N1,360 kg ha^(−1);N2,120 kg ha^(−1))and three biochar application levels(B1,60 t ha^(−1);B_(2),30 t ha^(−1)and B3,0 t ha^(−1)).A multi-objective synergistic irrigation-nitrogen-biochar application system for improving tomato yield,quality,water and nitrogen use efficiency,and greenhouse emissions was developed by integrating the techniques of experimentation and ***,a coupled irrigation-nitrogen-biochar plot experiment was ***,tomato yield and fruit quality parameters were determined experimentally to establish the response relationships between irrigation-nitrogen-biochar dosage and yield,comprehensive quality of tomatoes(TCQ),irrigation water use efficiency(IWUE),partial factor productivity of nitrogen(PFPN),and net greenhouse gas emissions(NGE).Finally,a multi-objective dynamic optimization regulation model of irrigation-nitrogen-biochar resource allocation at different growth stages of tomato was constructed which was solved by the fuzzy programming *** results showed that the application of irrigation and nitrogen to biochar promoted increase in yield,IWUE and PFPN,while it had an inhibitory effect on *** addition,the optimal allocation amounts of water and fertilizer were different under different *** yield of the S1 scenario increased by 8.31%compared to the B_(1)I_(1)N_(2) treatment;TCQ of the S2 scenario increased by 5.14%compared to the B_(2)I_(2)N_(1) treatment;IWUE of the S3 scenario increased by 10.01%compared to the B1I2N2 treatment;PFPN of the S4 scenario increased by

关键词： irrigation-nitrogen-biochar dynamic regulation multi-dimensional target collaboration tomato sustainability

Glycogen metabolism-mediated intercellular communication in the tumor microenvironment influences liver cancer prognosis

在线全文

学校读者我要写书评

暂无评论

Oncology Research 2024年第3期32卷 563-576页

作者： YANG ZHANG NANNAN QIN XIJUN WANG RUI LIANG QUAN liu RUOYI GENG tianxiao JIANG YUNFEI liu JINWEI LI Graduate School Kunming Medical UniversityKunming650000China Depatment of Vascular Surgery Fuwai Yunnan Cardiovascular HospitalAfliated Cardiovascular Hospital of Kunming Medical UniversityKunming650000China Department of Neurosurgery West China HospitalSichuan UniversityChengdu610000China Department of Neurosurgery The Fourth Afiliated Hospital of Guangxi Medical UniversityLiuzhou545000China Depatment of Gynecology Oncology The Fourth Afliated Hospital of Guangxi Medical UniversityLiuzhou545000China School of Basic Medical Sciences Xianning Medical CollegeHubei University of Science and TechnologyXianning437100China College of Bioengineering Chongqing UniversityChongqing400030China Department of General Visceraland Transplant SurgeryLudwig Maximilians University MunichMunich81377Germany

Glycogen metabolism plays a key role in the development of hepatoellular carcinoma(HCC),but the function of glycogen metabolism genes in the tumor microenvironment(TME)is still to be *** cell RNA-seq data were obtained from ten HCC tumor samples totaling 64,545 cells and 65 glycogen metabolism genes were analyzed bya nonnegative matrix factorization(NMF).The prognosis and immune response of new glycogen TME cell dusters were predicted by using HCC and immunotherapy cohorts from public *** single cell analysis was divided into fibroblasts,NT T cells,macrophages,endothelial clls,and B cells,which were separately divided into new cell clusters by glycogen metabolism gene *** temporal trajectory analysis demonstrated the temporal differentiation trajectory of different glycogen subtype cell *** communication analysis revealed extensive interactions between endothelial cells with glycogen metabolizing TME *** subtypes and diferent glycogen subtype cell *** analysis of transcription factors upstream of TME cell clusters with different glycogen *** addition,TME cell dusters of glycogen metabolism were found to be enriched in expression in CAF subtypes,CD8 depleted,M1,and M2 *** seq analysis showed the prognostic signifcance of glycogen *** TME cell dusters in HCC,while a significant immune response was found in the immunotherapy cohort in patients treated with immune checkpoint blockade(ICB),especially for CAFs,T cells,and macrophages In summary,our study reveals for the first time that glycogen metabolism mediates intercellular communication in the hepatocellular carcinoma microenvironment while elucidating the anti-tumor mechanisms and immune prognostic responses of different subtypes of cell dusters.

关键词： Glycogen metabolism Metabolic map Single cell Tumor microenvironment Liver cancer Prognosis Immunotherapy

COVID-19,the Pandemic of the Century and Its Impact on Cardiovascular Diseases

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

Cardiology Discovery 2021年第4期1卷 233-258页

作者： Yuanyuan Zhang Mingjie Wang Xian Zhang tianxiao liu Peter Libby Guo-Ping Shi Department of Medicine Brigham and Women’s Hospital and Harvard Medical SchoolBostonMassachusetts 02115USA

COVID-19 caused by severe acute respiratory syndrome coronavirus 2(SARS-CoV-2)infection likely ranks among the deadliest diseases in human *** with other coronaviruses,SARS-CoV-2 infection damages not only the lungs but also the heart and many other organs that express angiotensin-converting enzyme 2(ACE2),a receptor for ***-19 has upended lives *** behaviors have been altered such that they favor metabolic and cardiovascular complications,while patients have avoided hospital visits because of limited resources and the fear of infection,thereby increasing out-hospital mortality due to delayed diagnosis and *** observations show that sex,age,and race all influence the risk for SARS-CoV-2 infection,as do hypertension,obesity,and pre-existing cardiovascular *** hospitalized COVID-19 patients suffer cardiac injury,acute coronary syndromes,or cardiac ***-CoV-2 infection may lead to cardiomyocyte apoptosis and necrosis,endothelial cell damage and dysfunction,oxidative stress and reactive oxygen species production,vasoconstriction,fibrotic and thrombotic protein expression,vascular permeability and microvascular dysfunction,heart inflammatory cell accumulation and activation,and a cytokine *** data indicate that COVID-19 patients with cardiovascular diseases should not discontinue many existing cardiovascular therapies such as ACE inhibitors,angiotensin receptor blockers,steroids,aspirin,statins,and PCSK9 *** review aims to furnish a framework relating to COVID-19 and cardiovascular pathophysiology.

关键词： COVID-19 Severe acute respiratory syndrome coronavirus 2 Cardiovascular disease Angiotensin-converting enzyme 2 Hypertension Risk factor

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

高应力大变形巷道卸压让压联合控制技术

煤炭科学技术 2020年第S2期48卷 269-276页

作者：刘天啸闫帅韩力新汶矿业集团有限责任公司山东泰安271219 中国矿业大学矿业工程学院江苏徐州221116

为解决深井高应力巷道持续大变形问题,以某矿深部水平11采区轨道巷为工程背景,采用数值模拟、理论分析及实验室试验等方法,研究了不同层位关系下巷道围岩应力分布规律,分析了不同扰动下浅部围岩变形特点,探讨了支护构件破断失效的原因... 详细信息

为解决深井高应力巷道持续大变形问题,以某矿深部水平11采区轨道巷为工程背景,采用数值模拟、理论分析及实验室试验等方法,研究了不同层位关系下巷道围岩应力分布规律,分析了不同扰动下浅部围岩变形特点,探讨了支护构件破断失效的原因。以围岩高应力转移和持续大变形控制为主要思路,分析了合理的钻孔卸压方位、时机以及主要参数的取值范围,基于不同规格让压管的载荷-变形曲线及其特征参数选择了合理规格的让压管,并结合工程实际明确了钻孔卸压及让压支护具体参数,最终提出了"卸压+让压"联合控制技术并应用于现场。结果表明:帮部水平卸压钻孔能够有效改善围岩应力环境,减缓支护初期锚杆轴力上升速度,显著控制围岩变形,减少围岩变形对锚固效果的影响;在锚杆轴力达到让压点时,让压锚杆能够通过让压管压缩实现围岩变形能的有控卸载,从而改善杆体受力,更好地适应围岩变形。研究结果对类似条件下的巷道围岩控制具有借鉴意义。

关键词：高应力持续大变形钻孔卸压让压支护

渠道渗漏HYDRUS模拟验证及影响因素分析

在线全文

学校读者我要写书评

暂无评论

农业工程学报 2017年第16期33卷 112-118页

作者：付强李玥李天霄崔嵩刘东东北农业大学水利与土木工程学院哈尔滨150030

渠道渗漏影响灌溉水利用效率,分析影响渗漏的主要因素,评估各影响因素对渠道渗漏的影响程度,可以为提高灌溉水利用效率提供理论参考。为了得到渠道渗漏的主要影响因素,进行了渠道渗漏室内模拟试验,观测不同边坡系数、入渗水头、渠道底... 详细信息

渠道渗漏影响灌溉水利用效率,分析影响渗漏的主要因素,评估各影响因素对渠道渗漏的影响程度,可以为提高灌溉水利用效率提供理论参考。为了得到渠道渗漏的主要影响因素,进行了渠道渗漏室内模拟试验,观测不同边坡系数、入渗水头、渠道底宽下的累积入渗量和湿润锋推进过程,建立试验条件下的土壤水分运动模型,选用HYDRUS-2D软件求解所建模型,并将求解得到的模拟值与实测值进行比较,结果表明,模型模拟R2均高于0.9、均方根误差为0.43~4.99 L,检验了所建模型可以用于模拟渠道渗漏的土壤水分入渗过程。模拟表明,边坡系数对湿润锋运移距离和累积入渗量的影响很小,渠道底宽对渠道土壤水分入渗过程的影响较大,通过双因素方差分析,渠道底宽对累积入渗量和湿润锋运移距离的影响极显著(P0.05)。研究结果可以为提高灌溉水利用效率、对灌溉渠道防渗提供技术参考。

关键词：渠道入渗数值分析 HYDRUS-2D 湿润锋渗漏