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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

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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

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

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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

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

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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

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

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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

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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

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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

Pipeline Embolization Device for intracranial aneurysms presenting with mass effect:a large Chinese cohort

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Stroke & Vascular Neurology 2024年第1期9卷 50-58页

作者： Yang Zhao Junlin Lu Hongqi Zhang tianxiao LI Donglei Song Sheng Guan Aisha Maimaitili Yunyan Wang Wenfeng Feng Yang Wang Jieqing Wan Guohua Mao Huaizhang Shi Xinjian Yang Jianmin liu Yuanli Zhao Department of Neurosurgery Beijing Tiantan HospitalCapital Medical UniversityBeijingChina Department of Neurosurgery Peking University International HospitalBeijingChina Department of Neurosurgery West China HospitalSichuan UniversityChengduSichuanChina Department of Neurosurgery Xuanwu HospitalCapital Medical UniversityBeijingChina Department of Interventional Neuroradiology Zhengzhou University People's HospitalZhengzhouHenanChina Department of Neurosurgery Shanghai Donglei Brain HospitalShanghaiChina Department of Interventional Neuroradiology The First Affiliated Hospital of Zhengzhou UniversityZhengzhouHenanChina Department of Neurosurgery The First Affiliated Hospital of Xinjiang Medical UniversityUrumqiXinjiangChina Department of Neurosurgery Qilu Hospital of Shandong University QingdaoJinanShandongChina Department of Neurosurgery Nanfang HospitalSouthern Medical UniversityGuangzhouGuangdongChina Department of Neurosurgery The First Affiliated Hospital of Nanchang UniversityNanchangJiangxiChina Department of Neurosurgery Renji HospitalSchool of MedicineShanghai Jiao Tong UniversityShanghaiChina Department of Neurosurgery The Second Affiliated Hospital of Nanchang UniversityNanchangJiangxiChina Department of Neurosurgery The First Affiliated Hospital of Harbin Medical UniversityHarbinHeilongjiangChina Department of Neurosurgery Changhai HospitalNaval Medical UniversityShanghaiChina

Background Unruptured intracranial aneurysm treatment aims to reduce the risk of aneurysm rupture and bleeding,relieves symptoms and improve the quality of life for *** study aimed to assess the safety and efficacy of Pipeline Embolization Device(PED,Covidien/Medtronic,Irvine,CA)treatment for intracranial aneurysms presenting with mass effect in real-world *** We selected patients from the PED in China Post-Market Multi-Center Registry Study with mass effect *** study endpoints included postoperative mass effect deterioration and mass effect relief at follow-up(3–36 months).We conducted multivariate analysis to identify factors associated with mass effect *** analyses by aneurysm location,size and form were also *** This study included 218 patients with a mean age of 54.3±11.8 years and a female predominance of 74.0%(162/218).The postoperative mass effect deterioration rate was 9.6%(21/218).During a median follow-up period of 8.4 months,the mass effect relief rate was 71.6%(156/218).Notably,immediate aneurysm occlusion following treatment was significantly associated with mass effect relief(OR 0.392,95%CI,0.170 to 0.907,p=0.029).Subgroup analysis demonstrated that adjunctive coiling contributed to mass effect relief in cavernous aneurysms,while dense embolism impeded symptom relief in aneurysms<10mm and saccular *** Our data confirmed the efficacy of PED in relieving mass *** findings of this study provide support for endovascular treatment to alleviate mass effect in unruptured intracranial *** registration number NCT03831672.

关键词： aneurysm intracranial Irvine

多层螺旋CT三低技术在肺动脉栓塞中的应用研究

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当代医学 2023年第32期29卷 167-170页

作者：刘天笑李丰章萍乡市人民医院影像科江西萍乡337000

目的探讨多层螺旋CT(MSCT)三低技术在肺动脉栓塞中的应用效果。方法选取2020年12月至2021年12月萍乡市人民医院收治的80例怀疑肺动脉疾病且接受肺动脉检查螺旋CT血管成像患者作为研究对象,根据MSCT扫描方式分为常规组与三低组,每组40例... 详细信息

目的探讨多层螺旋CT(MSCT)三低技术在肺动脉栓塞中的应用效果。方法选取2020年12月至2021年12月萍乡市人民医院收治的80例怀疑肺动脉疾病且接受肺动脉检查螺旋CT血管成像患者作为研究对象,根据MSCT扫描方式分为常规组与三低组,每组40例。常规组行普通方案扫描,三低组行三低技术扫描,比较两组图像质量主观评价、图像质量客观评价[肺动脉CT值、信噪比(SNR)、对比噪声比(CNR)]、辐射剂量[剂量长度乘积(DLP)、有效剂量(ED)]、造影剂外渗率。结果两组图像评分均>3分,图像质量较好;两位阅片医师对两组图像质量的主观评分比较差异无统计学意义;两位医师评分结果一致性较好(Kappa=0.854)。三低组肺动脉干及左右肺动脉、左右各叶肺动脉CT值均高于常规组,差异有统计学意义(P<0.05);两组肺动脉干及左右肺动脉、左右各叶肺动脉SNR、CNR比较差异无统计学意义。三低组DLP小于常规组,ED少于常规组,差异有统计学意义(P<0.05)。三低组造影剂外渗率低于常规组,但差异无统计学意义。结论MSCT三低技术在临床肺动脉栓塞检查中具有一定的应用价值,其图像质量满意,且能减少对比剂用量、辐射剂量,降低造影剂外渗率。

关键词：肺动脉栓塞多层螺旋CT 三低技术

近十年中美开放获取论文发展情况分析——基于InCites数据库的比较

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中国科技期刊研究 2024年第1期35卷 110-120页

作者：康飞刘琪张涵高天晓北京建筑大学城市经济与管理学院北京市102616 中国科学院科技战略咨询研究院北京市100190 国家自然科学基金委员会科学传播与成果转化中心北京市100085

【目的】甄别中美2013—2022年开放获取(OA)论文在数量及影响力等方面的差异,提出对中国OA论文现阶段发展的建议,以推动开放科学发展。【方法】基于InCites数据库,对2013—2022年中美OA论文相关指标进行分析,统计中美研究人员发表OA论... 详细信息

【目的】甄别中美2013—2022年开放获取(OA)论文在数量及影响力等方面的差异,提出对中国OA论文现阶段发展的建议,以推动开放科学发展。【方法】基于InCites数据库,对2013—2022年中美OA论文相关指标进行分析,统计中美研究人员发表OA论文的数量、类型与学科分布,以及论文影响力相关引证指标,使用文献计量学方法进行对比分析。【结果】中国OA论文的数量和占比基本与美国持平,但类型分布不如美国均衡;学科分布上,医学与生命科学领域的OA论文数量远超其他学科;在影响力方面,无论是高被引论文数量还是学科规范化引文影响力指数,中国都与美国存在差距。【结论】中国OA论文发展在类型和学科上都有所失衡,未来应搭建OA平台,严格把关OA论文质量,完善相关制度。

关键词：开放获取学科规范化引文影响力开放科学中美比较 InCites数据库