检索结果-南通市图书馆

Wind-tunnel experimental studies of the spatial snow distribution over grass and bush surfaces

Journal of Hydrodynamics 2022年第1期34卷 85-93页

作者： Guang Li Jun-ming Qin hong-xiang yu Ning Huang Key Laboratory of Mechanics on Disaster and Environment in Western China The Ministry of Education of ChinaLanzhou UniversityLanzhou730000China School of Civil Engineering and Mechanics Lanzhou UniversityLanzhou730000China College of Atmospheric Science Lanzhou UniversityLanzhou730000China School of Architecture Civil and Environmental EngineeringSwiss Federal Institute of Technology LausanneLausanneSwitzerland

The snow is one of the most important water resources in grassland in northern and western China, while the wind blowing snow due to the strong wind there is a common phenomenon, which can lead to heavy disasters to harm the local animal husbandry and transportation. A reasonable arrangement of the snow protection forests is one of the most economical and effective methods to prevent the wind blowing snow, and a great number of investigations were carried out for its wind block effects. However, the deposition patterns of the snowfall and the blowing snow in the forests are still largely unknown. In this study, the wind tunnel experiments are performed to investigate the influences of the vegetation (grass and bush) on the wind speed profiles and the spatial distribution of the accumulated snow, by using the bran as the snow substitute. The snow blocking abilities of two bush models are analyzed to show the effects of different coverages. The results show that the grass and the bush have different effects on the wind speed profiles, and the snow-blocking abilities of the vegetation and the resulting spatial distribution are determined by the amount of the snowfall, the wind speed, and the height and the coverage of the vegetation. For the engineering design, if the snow is required on the windward side of the vegetation or in the vegetation, the densely arranged forest belts are needed, if the snow is required to accumulate on the leeward side of the vegetation, the sparse forest belts can be used. This work would be helpful as a reference to the reasonable arrangement of the snow-protection forests in pastoral areas.

关键词： Wind tunnel experiment wind speed profile vegetation snow-protection forest snow blocking ability

来源：

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

Difference between type 2 gastroesophageal varices and isolated fundic varices in clinical profiles and portosystemic collaterals

引用

World Journal of Clinical Cases 2022年第17期10卷 5620-5633页

作者： yu-Hu Song hong-yu xiang Ke-Ke Si Ze-Hui Wang yu Zhang Chang Liu Ke-Shu Xu Xin Li Department of Gastroenterology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina Department of Radiology Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina Hubei Province Key Laboratory of Molecular Imaging Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan 430022Hubei ProvinceChina

BACKGROUND There is significant heterogeneity between gastroesophageal varices(GOV2)and isolated gastric varices(IGV1).The data on the difference between GOV2 and IGV1 are *** To determine the etiology,clinical profiles,endoscopic findings,imaging signs,portosystemic collaterals in patients with GOV2 and *** Medical records of 252 patients with gastric fundal varices were retrospectively collected,and computed tomography images were *** Significant differences in routine blood examination,Child-Pugh classification and MELD scores were found between GOV2 and *** incidence of peptic ulcers in patients with IGV1(26.55%)was higher than that of GOV2(11.01%),while portal hypertensive gastropathy was more commonly found in patients with GOV2(22.02%)than in those with IGV1(3.54%).Typical radiological signs of cirrhotic liver were more commonly observed in patients with GOV2 than in those with *** patients with GOV2,the main afferent vessels were via the left gastric vein(LGV)(97.94%)and short gastric vein(SGV)(39.18%).In patients with IGV1,the main afferent vessels were via the LGV(75.61%),SGV(63.41%)and posterior gastric vein(PGV)(43.90%).In IGV1 patients with pancreatic diseases,spleno-gastromental-superior mesenteric shunt(48.15%)was a major collateral *** patients with fundic varices,the sizes of gastric/esophageal varices were positively correlated with afferent vessels(LGVs and PGVs)and efferent vessels(gastrorenal shunts).The size of the esophageal varices was negatively correlated with gastrorenal shunts in GOV2 *** Significant heterogeneity in the etiology and vascular changes between GOV2 and IGV1 is useful in making therapeutic decisions.

关键词： Gastrorenal shunt Spleno-gastroomental-superior mesenteric shunt Liver cirrhosis Pancreatic diseases

来源：

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

不同流动状态下98%硫酸的强化传热

引用

华南理工大学学报（自然科学版） 2011年第11期39卷 33-39页

作者：洪宇翔邓先和华南理工大学传热强化与过程节能教育部重点实验室广东广州510640

通过数值模拟,研究了98%硫酸在内插旋流片缩放管管内的传热与流阻特性,并与光滑管、缩放管空管的传热效果进行了对比,分析了不同流动状态和热物理性能对内插旋流片缩放管类换热器综合传热性能的影响,揭示了速度场与温度场之间的协同性.... 详细信息

通过数值模拟,研究了98%硫酸在内插旋流片缩放管管内的传热与流阻特性,并与光滑管、缩放管空管的传热效果进行了对比,分析了不同流动状态和热物理性能对内插旋流片缩放管类换热器综合传热性能的影响,揭示了速度场与温度场之间的协同性.结果表明:层流时内插旋流片缩放管的综合传热性能优于缩放管空管,湍流时则相反;小扭率有利于内插旋流片缩放管层流综合性能的提高,大扭率则有利于湍流综合性能的提高;层流条件下内插旋流片对传热场的协同增强的作用显著,湍流条件下的作用不显著;内插旋流片缩放管类换热器对于低黏度与高黏度的工质均有较好的强化传热效果.

关键词：强化传热缩放管旋流片硫酸场协同

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

面向业务流程的信息系统风险控制方法

引用

北京邮电大学学报 2016年第3期39卷 105-109页

作者：杨宏宇成翔中国民航大学计算机科学与技术学院天津300300

为有效控制信息系统中业务流程所面临的安全风险,提出一种基于业务流程的风险控制方法(WRCM).该方法包含风险量化和风险控制两部分,在风险量化部分为风险控制部分定义了11个风险量化参数.在风险控制部分,以线性规划方法为基础,通过控制... 详细信息

为有效控制信息系统中业务流程所面临的安全风险,提出一种基于业务流程的风险控制方法(WRCM).该方法包含风险量化和风险控制两部分,在风险量化部分为风险控制部分定义了11个风险量化参数.在风险控制部分,以线性规划方法为基础,通过控制效果最大化操作,将最小残余风险损失作为目标函数导出安全风险损失最小化部署方案;通过控制成本最小化操作,将最小控制成本作为目标函数,在不超过最小残余风险损失的前提下导出控制成本最小化部署方案.风险控制效果对比实验检测结果表明,WRCM具有较好的安全风险控制效果和较低的控制成本.

关键词：业务流程信息安全风险控制线性规划方法控制成本

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Quantum public-key crypto via EPR pairs

引用

Science China(Physics,Mechanics & Astronomy) 2025年第1期Mechanics & Astronomy) .卷 58-63页

作者： xiang-Qun Fu hong-Wei Li Jian-hong Shi Tan Li Wan-Su Bao Henan Key Laboratory of Quantum Information and Cryptography Information Engineering University Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China

With the development of quantum computing technology, quantum public-key cryptography is gradually becoming an alternative to the existing classical public-key cryptography. This paper designs a quantum trapdoor one-way function via EPR pairs and quantum measurements. Based on this, a new quantum public-key cryptosystem is presented, which offers forward security,and can resist the chosen-plaintext attack and chosen-ciphertext attack. Compared with the existing quantum public-key cryptos,eavesdropping can be automatically detected in this new quantum public-key cryptosystem under a necessary condition, which is also detailed in the paper.

关键词： quantum public-key crypto trapdoor one-way function EPR pairs

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

交流斩波器的新型谐波抑制脉宽调制技术(英文)

引用

中国电机工程学报 2005年第5期25卷 68-73页

作者：俞红祥纪延超林敏哈尔滨工业大学电气工程系黑龙江省哈尔滨市150001

提出了一种应用于交流斩波器的新型谐波抑制脉宽调制技术。它通过开环方式,对交流斩波器的输出占空比进行实时调节。和已有的恒定占空比控制相比,实现了对交流输入电压中低次谐波的完全消除,并且不要求计算相应的谐波分量,这简化了控制... 详细信息

提出了一种应用于交流斩波器的新型谐波抑制脉宽调制技术。它通过开环方式,对交流斩波器的输出占空比进行实时调节。和已有的恒定占空比控制相比,实现了对交流输入电压中低次谐波的完全消除,并且不要求计算相应的谐波分量,这简化了控制策略,同时显著降低了系统对控制器带宽的要求。文中分析和推导了调制函数的解析式,并给出了详细的实现方案。理论分析和仿真表明其在电压谐波消除中的优越性能。2kVA 样机的实验结果验证了该调制技术对交流系统侧谐波电压具有良好的抑制能力。

关键词：斩波器谐波抑制脉宽调制技术电压谐波次谐波谐波分量谐波电压占空比带宽开环

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Molecular Systematic Studies on Chinese Mandarina Silkworm (Bombyx mandarina M.) and Domestic Silkworm (Bombyx mori L.)

引用

Agricultural Sciences in China 2002年第3期1卷 349-358页

作者： LU Cheng, yu hong-shi and xiang Zhong-huai( The Key Sericultural Laboratory of Agricultural Ministry, College of Silkworm and Silk engineering , Southwest Agricultural University, Chongqing 400716) The Key Sericultural Laboratory of Agricultural Ministry College of Silkworm and Silk engineering Southwest Agricultural University Chongqing 400716

Molecular systematic studies on mandarina silkworm (Bombyx mandarina M.) in 11 regions in China and 25 representative strains of domestic silkworm (Bombyx mori L.) were conducted using molecular biology techniques. Results obtained from the analysis of DNA polymorphism and clustering of all the silkworm samples provide new evidence for the view that the domestic silkworm originated from the Chinese mandarina silkworm. On the basis of literature reviewing, a new hypothesis on the origin of the domestic silkworm was put forward. It was thought that the domestic silkworm was most probably domesticated from the Chinese mandarina silkworm of different ecotypes including monovoltinism, bivoltinism and multivoltinism; and that the domestic silkworm had the genetic background of monovoltinism, bivoltinism and multivoltinism at the very beginning of the domestication. The current strains of the domestic silkworm of different voltinism are the evolutionary results of thousands of years of rearing and artificial selections.

关键词： Bombyx mandarina M. Bombyx mori L. DNA polymorphism Systematic evolution

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Clinicopathologic analysis of 722 breast cancer patients who met the inclusion criteria of the TAILORx trial

引用

Chinese Medical Journal 2019年第24期132卷 2914-2919页

作者： hong-yu xiang Yin-Hua Liu hong Zhang Shuang Zhang Ling Xin Ling Xu Jing-Ming Ye Ting Li Xue-Ning Duan Qian Liu Breast Disease Center Peking University First HospitalBeijing 100034China Department of Pathology Peking University First HospitalBeijing 100034China

Background:The results of the Trial Assigning IndividuaLized Options for Treatment(TAILORx)suggested that approximately 70%of T1-2N0M0,hormone receptor-positive,human epidermal growth factor receptor 2(HER2)-negative breast cancer patients can avoid chemotherapy and receive only adjuvant endocrine *** conducted a retrospective analysis of the clinicopathologic features and prognostic factors of patients with breast cancer who met the inclusion criteria of the TAILORx ***:According to the enrollment criteria of the TAILORx trial,a retrospective analysis was performed on patients with breast cancer who were treated from January 2008 to December 2015 at Peking University First *** clinicopathologic characteristics of all patients were analyzed,and prognoses were calculated using the Kaplan-Meier method and a Cox proportionate hazards ***:A total of 2430 patients with early stage breast cancer who were admitted at our hospital had complete clinicopathologic data and follow-up *** these patients,722 met the inclusion criteria and were enrolled in the present study,accounting for 29.7%of all *** them,417(57.8%)patients received only adjuvant endocrine therapy(the non-chemo group),and 305(42.2%)patients received adjuvant chemotherapy followed by adjuvant endocrine therapy(the chemo group).No statistically significant difference was observed in overall survival(OS)between the two groups(non-chemo ***:5-year OS:97.9%vs.97.9%,χ^2=1.00,P=0.995;hazard ratio[HR]=1.00,95%confidence interval[CI]:0.46–2.21).A significant difference was observed in disease-free survival(DFS)between the two groups(non-chemo ***:5-year DFS:97.9%vs.94.7%,χ^2=8.65,P=0.003;HR=3.05,95%CI:1.40–6.67).The choice of adjuvant therapy was associated with clinicopathologic factors,such as the age at diagnosis,T stage,histologic grade,the Ki67 index,the presence of intravascular tumor thrombus(P<0.001),pathologic type,and menstrual status(P=0.014

关键词： Adjuvant therapy Early stage breast cancer Multigene detection Prognosis TAILORx trial

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

新型谐波消除交流电压调节器的研究

引用

电力系统自动化 2005年第17期29卷 76-80页

作者：俞红祥林敏纪延超哈尔滨工业大学电气工程系黑龙江省哈尔滨市150001

提出一种新型谐波消除交流电压调节器方案,采用斩波方式AC-AC降压变换器结合输出串联补偿升压变压器实现负载电压的双向调节。其中降压变换器应用先进的谐波消除脉宽调制技术以实现交流系统侧所有低次谐波成分在输出负载端的消除,且其... 详细信息

提出一种新型谐波消除交流电压调节器方案,采用斩波方式AC-AC降压变换器结合输出串联补偿升压变压器实现负载电压的双向调节。其中降压变换器应用先进的谐波消除脉宽调制技术以实现交流系统侧所有低次谐波成分在输出负载端的消除,且其调制函数可以根据简便的前馈方法从输入电压信号中直接求解,因此具有良好的动态响应特性和实践可行性。2kVA样机的实测结果表明,所提出的方案在交流电压精确调节以及谐波抑制方面具有良好的表现。

关键词：电力电子交流电压调节器脉宽调制谐波消除

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

AZD1775 synergizes with SLC7A11 inhibition to promote ferroptosis

引用

Science China Life Sciences 2025年第1期68卷 204-218页

作者： Chen Xiong hong Ling Yingdan Huang Hanzhi Dong Bangxiang Xie Qian Hao xiang Zhou Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences Fudan University Department of Oncology Shanghai Medical CollegeFudan University Department of Breast Surgery Fudan University Shanghai Cancer CenterFudan University Department of Oncology First Affiliated Hospital of Nanchang University Beijing Institute of Hepatology Beijing Youan HospitalCapital Medical University Beijing Engineering Research Center for Precision Medicine and Transformation of Hepatitis and Liver Cancer Key Laboratory of Breast Cancer in Shanghai Fudan University Shanghai Cancer CenterFudan University Shanghai Key Laboratory of Medical Epigenetics International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology)Institutes of Biomedical SciencesFudan University

Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies, including WEE1 inhibition. Considering that p53 activation can also lead to multiple types of cell death, the role of this tumor suppressor in WEE1 inhibitor-based therapies remains disputed. In this study, we reported that nucleolar stress-mediated p53 activation enhanced the WEE1 inhibitor AZD1775-induced ferroptosis to suppress lung cancer growth. Our findings showed that AZD1775 promoted ferroptosis by blocking cystine uptake, an action similar to that of Erastin. Meanwhile, inhibition of WEE1 by the WEE1 inhibitors or si RNAs induced compensatory upregulation of SLC7A11, which conferred resistance to ferroptosis. Mechanistically, AZD1775 prevented the enrichment of H3K9me3, a histone marker of transcriptional repression, on the SLC7A11 promoter by repressing the expression of the histone methyltransferase SETDB1, thereby enhancing NRF2-mediated SLC7A11 transcription. This finding was also validated using the H3K9me3 inhibitor BRD4770. Remarkably, we found that the nucleolar stress-inducing agent Actinomycin D(Act. D) inhibited SLC7A11 expression by activating p53, thus augmenting AZD1775-induced ferroptosis. Moreover, the combination of AZD1775 and Act. D synergistically suppressed wild-type p53-harboring lung cancer cell growth both in vitro and in vivo. Altogether, our study demonstrates that AZD1775 promotes ferroptosis by targeting cystine uptake but also mediates the adaptive activation of SLC7A11 through the WEE1-SETDB1 cascade and NRF2-induced transcription, and inhibition of SLC7A11 by Act. D boosts the anti-tumor efficacy of AZD1775 by enhancing ferroptosis in cancers with wild-type p53.

关键词： p53 NRF2 SLC7A11 WEE1 AZD1775 ferroptosis nucleolar stress

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：