期刊文献+
共找到416篇文章
< 1 2 21 >
每页显示 20 50 100
Anti-terrorism and Human Rights Protection: Africa in Perspective
1
作者 Paul Andrew GWAZA 《The Journal of Human Rights》 2015年第2期167-177,共11页
The relation between Anti-terrorism and human rights Protection is rather complicated. Based on the practices in Africa, this article analyses the conflicts and contradictions between the two. While countering terrori... The relation between Anti-terrorism and human rights Protection is rather complicated. Based on the practices in Africa, this article analyses the conflicts and contradictions between the two. While countering terrorism, governments have to take the duty of human rights protection as well. Rights are of key importance in preventing and countering terrorism. Integrating human rights construction into antiterrorism mechanism is rather helpful in eliminating various moods of dissatisfaction which are easy to breed terrorism. 展开更多
关键词 anti-terrorism Human Rights protection AFRICA
下载PDF
Targeting the body to protect the brain:inducing neuroprotection with remotely-applied near infrared light
2
作者 Daniel M.Johnstone John Mitrofanis Jonathan Stone 《Neural Regeneration Research》 SCIE CAS CSCD 2015年第3期349-351,共3页
The incidence of intractable age-related neurodegenerative conditions such as Alzheimer's and Parkinson's diseases and age-related macular degeneration is projected to increase substantially over the coming decades ... The incidence of intractable age-related neurodegenerative conditions such as Alzheimer's and Parkinson's diseases and age-related macular degeneration is projected to increase substantially over the coming decades with the ageing of the global population. While the burden of disease associ- ated with other chronic conditions has decreased in recent times due to improved diagnosis and treatment, current therapies for neurodegenerative diseases still fall short in that they are only effective in treating signs and symptoms - they do little to slow or prevent disease progress. Thus, there is an urgent need for treatments that address disease progression. 展开更多
关键词 body MPTP targeting the body to protect the brain MSCs
下载PDF
Bone morphogenetic protein signaling:a promising target for white matter protection in perinatal brain injury
3
作者 Jill Chang Robert W.Dettman Maria L.V.Dizon 《Neural Regeneration Research》 SCIE CAS CSCD 2018年第7期1183-1184,共2页
Prematurely born newborns,as well as those born at term,may suffer from several types of brain injury including hypoxic-ischemic injury,intracranial hemorrhage,both intraventricular and parenchymal,and injury that is ... Prematurely born newborns,as well as those born at term,may suffer from several types of brain injury including hypoxic-ischemic injury,intracranial hemorrhage,both intraventricular and parenchymal,and injury that is the consequence of intrauterine growth restriction(IUGR).Injury of all types can impact the motor and cognitive abilities of survivors.The mechanisms leading to disability are not completely understood. 展开更多
关键词 In Bone morphogenetic protein signaling:a promising target for white matter protection in perinatal brain injury
下载PDF
Targeted Antimicrobial Therapy Against Streptococcus mutans Establishes Protective Non-cariogenic Oral Biofilms and Reduces Subsequent Infection 被引量:5
4
作者 Li-na Li Li-hong Guo +5 位作者 Renate Lux Randal Eckert Daniel Yarbrough Jian He Maxwell Anderson Wen-yuan Shi 《International Journal of Oral Science》 SCIE CAS CSCD 2010年第2期66-73,共8页
Aim Dental biofilms are complex communities composed largely of harmless bacteria. Certain pathogenic species including Streptococcus mutans (S. mutans) can become predominant when host factors such as dietary sucro... Aim Dental biofilms are complex communities composed largely of harmless bacteria. Certain pathogenic species including Streptococcus mutans (S. mutans) can become predominant when host factors such as dietary sucrose intake imbalance the biofilm ecology. Current approaches to control S. mutans infection are not pathogen-specific and eliminate the entire oral community along with any protective benefits provided. Here, we tested the hypothesis that removal of S. mutans from the oral community through targeted antimicrobial therapy achieves protection against subsequent S. mutans colonization. Methodology Controlled amounts of S. mutans were mixed with S. mutans-free saliva, grown into biofilms and visualized by antibody staining and cfu quantization. Two specifically-targeted antimicrobial peptides (STAMPs) against S. mutans were tested for their ability to reduce S. mutans biofilm incorporation upon treatment of the inocula. The resulting biofilms were also evaluated for their ability to resist subsequent exogenous S. mutans colonization. Results S. mutans colonization was considerably reduced (9 ± 0.4 fold reduction, P=0.01) when the surface was preoccupied with saliva-derived biofilms. Furthermore, treatment with S. mutans-specific STAMPs yielded S. mutans-deficient biofilms with significant protection against further S. mutans colonization (5 minutes treatment: 38 ± 13 fold reduction P=0.01; 16 hours treatment: 96 ± 28 fold reduction P=0.07). Conclusion S. mutans infection is reduced by the pre- sence of existing biofilms. Thus maintaining a healthy or "normal" biofilm through targeted antimicrobial therapy (such as the STAMPs) could represent an effective strategy for the treatment and prevention of S. mutans colonization in the oral cavity and caries progression. 展开更多
关键词 targeted antimicrobial therapy antimicrobial peptide BIOFILM Streptococcus mutans protective colonization CARIES
下载PDF
Pre-B-cell colony-enhancing factor as a target for protecting against apoptotic neuronal death and mitochondrial damage in ischemia 被引量:6
5
作者 Xiaowan Wang Shinghua Ding 《Neural Regeneration Research》 SCIE CAS CSCD 2016年第12期1914-1915,共2页
Focal ischemic stroke(FIS)results from the lack of blood flow in a particular region of the brain and accounts for about 80%of all human strokes.Although tremendous efforts have been made in translational research,t... Focal ischemic stroke(FIS)results from the lack of blood flow in a particular region of the brain and accounts for about 80%of all human strokes.Although tremendous efforts have been made in translational research,the treatment strategies are still limited.Tissue plasminogen activator is the only FDA-approved drug currently available for acute stroke treatment, 展开更多
关键词 PBEF Pre-B-cell colony-enhancing factor as a target for protecting against apoptotic neuronal death and mitochondrial damage in ischemia NAD cell AIF MCAO
下载PDF
Can we protect the brain via preconditioning?Role of microRNAs in neuroprotection 被引量:1
6
作者 Sean Quinlan Eva M.Jimenez-Mateos 《Neural Regeneration Research》 SCIE CAS CSCD 2016年第3期388-389,共2页
Preconditioning stimulus:Preconditioning is an adaptive response,whereby a small dose of a harmful substance protects the brain from a subsequent damaging insult(Dirnagl et al.,2009).The concept of preconditioning ... Preconditioning stimulus:Preconditioning is an adaptive response,whereby a small dose of a harmful substance protects the brain from a subsequent damaging insult(Dirnagl et al.,2009).The concept of preconditioning was first described in an ischemic heart model,it was observed that brief ischemic episodes protect against a subsequent ischemic insult(Murry et al., 1986). 展开更多
关键词 subsequent protect harmful brief targeting synaptic stimulus epileptic targeted RNA
下载PDF
Water resources optimization and eco-environmental protection in Qaidam Basin
7
作者 FANG Chuang-lin~1, BAO Chao~2 (1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 2. Dept. of Geography, Peking University, Beijing 100871, China) 《Journal of Geographical Sciences》 SCIE CSCD 2001年第2期231-238,共8页
In order to realize sustainable development of the arid area of Northwest China, rational water resources exploitation and optimization are primary prerequisites. Based on the essential principle of sustainable develo... In order to realize sustainable development of the arid area of Northwest China, rational water resources exploitation and optimization are primary prerequisites. Based on the essential principle of sustainable development, this paper puts forward a general idea on water resources optimization and eco-environmental protection in Qaidam Basin, and identifies the competitive multiple targets of water resources optimization. By some qualitative methods such as Input-output Model & AHP Model and some quantitative methods such as System Dynamics Model & Produce Function Model, some standard plans of water resources optimization come into being. According to the Multiple Targets Decision by the Closest Value Model, the best plan of water resources optimization, eco-environmental protection and sustainable development in Qaidam Basin is finally decided. 展开更多
关键词 water resources optimization Multiple targets Decision by the Closest Value Model eco-environmental protection Qaidam Basin
下载PDF
Conserving plants within and beyond protected areas-still problematic and future uncertain 被引量:2
8
作者 Vernon H.Heywood 《Plant Diversity》 SCIE CAS CSCD 2019年第2期36-49,共14页
Against a background of continuing loss of biodiversity, it is argued that for the successful conservation of threatened plant species we need to ensure the more effective integration of the various conservation actio... Against a background of continuing loss of biodiversity, it is argued that for the successful conservation of threatened plant species we need to ensure the more effective integration of the various conservation actions employed, clarify the wording of the CBD targets and provide clearer operational guidance as to how they are to be implemented and their implementation monitored. The role and effectiveness of protected areas in conserving biodiversity and in particular plant species in situ are discussed as are recent proposals for a massive increase of their extent. The need for much greater effort and investment in the conservation or protection of threatened species outside protected areas where most plant diversity occurs is highlighted. The difficulties involved in implementing effective in situ conservation of plant diversity both at an area-and species/population-based level are discussed. The widespread neglect of species recovery for plants is noted and the desirability of making a clearer distinction between species recovery and reintroduction is emphasized. Key messages from a global overview of species recovery are outlined and recommendations made, including the desirability of each country preparing a national species recovery strategy. The projected impacts of global change on protected areas and on species conservation and recovery, and ways of addressing them are discussed. 展开更多
关键词 Plant CONSERVATION CBD targetS protected areas Species recovery CONSERVATION approaches
下载PDF
Protective effect of fu-qi granule on carbon tetrachloride-induced liver fibrosis in rats
9
作者 Lin Zhong Yan-Ling Sun +8 位作者 Wen-Li Shi Xiao Ma Zhe Chen Jia-Bo Wang Rui-Sheng Li Xue-Ai Song Hong-Hong Liu Yan-Ling Zhao Xiao-He Xiao 《World Journal of Pharmacology》 2015年第2期227-235,共9页
AIM: To investigate the effcacy of fu-qi granule (FQG) on carbon tetrachloride (CCl4) induced liver fbrosis in rats and the underlying mechanisms. METHODS: Sixty rats were randomly divided into six groups: norm... AIM: To investigate the effcacy of fu-qi granule (FQG) on carbon tetrachloride (CCl4) induced liver fbrosis in rats and the underlying mechanisms. METHODS: Sixty rats were randomly divided into six groups: normal control group, CCl4 induced liver fbrosis group, AnluoHuaxianWan group and three treatment groups of FQG. Treatment of rats with intraperitoneal injection of carbon tetrachloride solution at 0.3 mL per 100 g body weigh twice a week for 8 wk. The normal control group the rats were given the media (olive oil) at the same time. In the frst 2 wk, rats were raised with feedstuff (80% corn meal, 20% lard, 0.5% cholesterol). Serum samples were collected for alanine transaminase, aspartate aminotransferase, alkaline phosphatase, albumin, total protein assay and typical histopathological changes was observed in Hematoxylin-eosin staining sections. Smooth muscle alpha actin (α-SMA) was analyzed with immunohistochemistry. Mammalian target of rapamycin (mTOR) and hypoxia-inducible factor-1 (HIF-1α) expressions were detected by Western blot-ting. Tissue inhibitor of matrix metalloproteinases-1 (TIMP-1) and matrix metalloproteinases-9 (MMP-9) were measured with semi-quantitative reverse transcriptase-polymerase chain reaction.RESULTS: FQG significantly reduced the serum levels of alanine transaminase, aspartate aminotransferase, alkaline phosphatase and increased the serum contents of albumin, total protein in rats with liver fibrosis. Moreover, FQG promoted extracellular matrix degradation by increasing MMP-9 and inhibiting TIMP-1 and α-SMA. mTOR and HIF-1α expression in liver significantly decreased in the rats treated with FQG. CONCLUSION: The results indicated that FQG signi-fcantly reverse fbrosis induced by CCl4, which should be developed as a new and promising preparation for the prevention of liver fbrosis. 展开更多
关键词 protective effect Fu-qi granule Carbon tetrachloride Mammalian target of rapamycin/p70S6K signal pathway Liver fbrosis
下载PDF
对称故障下变流器控制对差动保护影响及优化策略
10
作者 黄涛 谢华 +1 位作者 徐晓春 赵青春 《中国电机工程学报》 EI CSCD 北大核心 2024年第13期5063-5072,I0004,共11页
变流器输出故障特征的强可控性给交流系统继电保护带来了严峻挑战。该文分析并网线路发生对称故障时跟网型变流器的控制响应过程,从故障期间变流器电流控制目标不能自动匹配故障回路功率需求的角度,分析推导变流器网侧电压相位发生跳变... 变流器输出故障特征的强可控性给交流系统继电保护带来了严峻挑战。该文分析并网线路发生对称故障时跟网型变流器的控制响应过程,从故障期间变流器电流控制目标不能自动匹配故障回路功率需求的角度,分析推导变流器网侧电压相位发生跳变并不断旋转的变化特征。受故障回路阻抗约束,变流器输出短路电流相位与网侧电压相位同步变化,造成并网线路差动保护性能严重下降。基于变流器网侧电压相位变化机理,从电流控制目标与锁相环控制两个维度,提出兼顾保护需求和供电需求的变流器控制优化策略。仿真结果表明,并网线路对称故障时所提策略能有效抑制两侧电流相位差,显著提升了差动保护动作性能。 展开更多
关键词 变流器 差动保护 相位受控 控制目标 锁相环
下载PDF
基于联邦学习的分布式电采暖互动模式设计与展望 被引量:2
11
作者 李彬 白雪峰 +3 位作者 李志超 王仕俊 刘淳 程紫运 《综合智慧能源》 2024年第1期56-64,共9页
随着“双碳”目标的提出,以及“以电代煤”政策的贯彻落实,大量电采暖设备取代传统燃煤取暖投入运行并接入电网将成为必然趋势。大量电采暖设备可以作为需求侧可调资源进行新能源消纳,但是分布式电采暖所处地理区域较为分散,传统集中式... 随着“双碳”目标的提出,以及“以电代煤”政策的贯彻落实,大量电采暖设备取代传统燃煤取暖投入运行并接入电网将成为必然趋势。大量电采暖设备可以作为需求侧可调资源进行新能源消纳,但是分布式电采暖所处地理区域较为分散,传统集中式管理的方式又存在隐私泄露、数据孤岛等问题。联邦学习作为一种分布式技术可在保护隐私的前提下支撑电采暖负荷互动,在分布式电采暖互动领域具有较强的适用性。分析了基于联邦学习的分布式电采暖互动需求,以及边缘缓存、隐私防护、通信传输优化和异构资源融合等技术在基于联邦学习的电采暖互动场景中的应用方式,并展望了未来基于联邦学习的分布式电采暖互动前景。 展开更多
关键词 “双碳”目标 电采暖互动 联邦学习 边缘缓存 隐私保护 通信传输优化 异构融合技术 可再生能源消纳
下载PDF
油泥污染土壤处理技术研究进展
12
作者 金玉 张钰莹 沙基罗维奇 《节能与环保》 2024年第5期22-29,共8页
“双碳”背景下,环境保护受到前所未有的关注,油泥污染土壤作为一种重要的行业危险废物,由于其产量大、污染重、具有资源回收价值等特点,其处理和回用已成为目前国内外亟待解决的环保难题,油泥污染土壤处理技术也成为了当前从业者的研... “双碳”背景下,环境保护受到前所未有的关注,油泥污染土壤作为一种重要的行业危险废物,由于其产量大、污染重、具有资源回收价值等特点,其处理和回用已成为目前国内外亟待解决的环保难题,油泥污染土壤处理技术也成为了当前从业者的研究热点。本文基于当前油泥污染土壤的污染现状和处理现状,综述了油泥污染土壤处理技术方法中热化学清洗法、萃取法、热解法和电化学生物耦合处理技术的应用现状和研究进展,围绕这几类技术的优缺点以及改进性研究展开分析,列举了一些较为前沿的研究工作及其研究成果。文末,对油泥污染土壤处理技术进行了展望,并总结了油泥污染土壤处理技术的未来发展趋势,以期为相关研究者进行油泥污染土壤处理研究带来一定的参考。 展开更多
关键词 双碳目标 油泥污染土壤 土壤修复 环境保护 资源回收
下载PDF
基于非靶向代谢组学和肠道菌群探究经典名方泻白散对过敏性哮喘大鼠的保护作用 被引量:1
13
作者 杨宗统 徐东川 +4 位作者 刘瑾 李晓晶 张会敏 王雯慧 隋在云 《中国实验动物学报》 CAS CSCD 北大核心 2024年第2期177-189,共13页
目的本研究拟从宿主-肠道菌群-代谢的角度探讨泻白散保护过敏性哮喘大鼠可能的微观机制。方法将SPF级SD大鼠分为正常对照组(NC组)、过敏性哮喘模型组(M组)和泻白散组(Xiebaisan组)。通过卵清白蛋白(OVA)诱导建立大鼠过敏性哮喘模型;HE... 目的本研究拟从宿主-肠道菌群-代谢的角度探讨泻白散保护过敏性哮喘大鼠可能的微观机制。方法将SPF级SD大鼠分为正常对照组(NC组)、过敏性哮喘模型组(M组)和泻白散组(Xiebaisan组)。通过卵清白蛋白(OVA)诱导建立大鼠过敏性哮喘模型;HE染色观察大鼠肺组织病理学变化;取结肠内容物进行16S rDNA高通量测序,观察肠道菌群结构与功能的变化;采用超高效液相色谱-四级杆飞行时间串联质谱法(UHPLC-Q-TOF/MS)分别进行血清样本和肺组织样本非靶向代谢组学检测。结果HE染色显示:与NC组相比,Xiebaisan组可以在一定程度上改善哮喘大鼠肺部组织形态结构;16S rDNA高通量测序结果显示:M组肠道菌群多样性降低,与M组相比,Xiebaisan组肠道菌群多样性增加,肠道微生态得以改善;血清非靶向代谢组学检测结果显示:Xiebaisan组能够调节氨基酸代谢、mTOR等通路,且部分回调M组引起的差异代谢物表达;肺组织样本非靶向代谢组学检测结果显示,Xiebaisan组能够调节碳代谢、血管平滑肌收缩信号通路和cAMP等信号通路,且部分回调M组引起的差异代谢物表达。结论泻白散可能通过改善肺组织形态结构、肠道菌群的多样性以及调控mTOR通路、血管平滑肌收缩信号通路和cAMP等信号通路影响氨基酸代谢、碳代谢等途径发挥对过敏性哮喘大鼠的保护作用。 展开更多
关键词 泻白散 过敏性哮喘 肠道菌群 非靶向代谢组学 保护机制
下载PDF
面向电力生产精细化风险解译的高度相似防护工具智能检测技术研究 被引量:2
14
作者 马富齐 王波 +2 位作者 董旭柱 冯磊 贾嵘 《中国电机工程学报》 EI CSCD 北大核心 2024年第3期971-980,I0010,共11页
电力生产通常面临高低电压、强弱电流等复杂工作环境转换,不同作业场景有严格的防护工具使用标准,因此,研究生产作业过程防护工具的精细辨识对保障人员安全及电网安全意义重大。已有研究可实现安全帽、工作服等基础着装类检测,而实际生... 电力生产通常面临高低电压、强弱电流等复杂工作环境转换,不同作业场景有严格的防护工具使用标准,因此,研究生产作业过程防护工具的精细辨识对保障人员安全及电网安全意义重大。已有研究可实现安全帽、工作服等基础着装类检测,而实际生产中存在大量形态高度相似的实体防护工具,如绝缘手套与线手套、绝缘杆与验电杆等。为此,该文提出一种基于深度代表性度量学习的相似防护工具智能检测方法。将目标类别特征学习转换为以差异化表达不同目标特征距离为目的的嵌入式空间特征学习,得到表征不同目标的深度代表性特征向量,通过计算未知目标与代表性特征向量的距离进行类别判断,最后以现场图像进行试验验证。试验结果表明:所提方法实现了对形态相似防护工具的特征差异表达和精准辨识,相比于常见目标检测模型具有更优越的辨识性能,从而提高电力生产安全风险辨识的精细化水平。 展开更多
关键词 生产安全防护 安全影像解译 电力深度视觉 高度相似目标 深度度量学习 嵌入特征空间
下载PDF
植保无人机对水稻病虫害防治应用效果分析 被引量:2
15
作者 杨华 沈亮 +8 位作者 杜木军 吕海杰 程亨曼 程建波 邓宇 韩喜军 窦钰程 彭君峰 王晋 《农机使用与维修》 2024年第6期120-122,共3页
植保无人机通过搭载各类传感器和作业设备,实现对农田作物的病虫害监测、识别和防治,与传统人工施药和检测方式相比,植保无人机具有作业效率高、作业范围广、作业精度高等优点,正逐渐在农业生产中发挥重要作用。该文通过对植保无人机在... 植保无人机通过搭载各类传感器和作业设备,实现对农田作物的病虫害监测、识别和防治,与传统人工施药和检测方式相比,植保无人机具有作业效率高、作业范围广、作业精度高等优点,正逐渐在农业生产中发挥重要作用。该文通过对植保无人机在水稻病虫害防治中的应用效果进行综述分析,总结了现存问题,并对未来发展趋势进行展望,得到植保无人机在病虫害防治过程中具有作业效率高、施药精准、环境友好等特点,可为实现精准农业、提高农业产值提供参考。 展开更多
关键词 植保无人机 病虫害防治 监测 定点防治 挑战
下载PDF
刚性弹体侵彻混凝土和花岗岩数值模拟研究
16
作者 刘兵 郭瑞奇 +1 位作者 康雨嫣 董杰 《湘潭大学学报(自然科学版)》 CAS 2024年第4期28-39,共12页
为了研究混凝土靶板和花岗岩靶板的抗侵彻能力,通过ANSYS/LS-DYNA有限元分析软件,对刚性弹体侵彻Holmquist-Johnson-Cook(HJC)模型混凝土靶板和花岗岩靶板的过程进行数值模拟,通过数值模拟结果与试验结果及理论公式计算结果的对比,验证... 为了研究混凝土靶板和花岗岩靶板的抗侵彻能力,通过ANSYS/LS-DYNA有限元分析软件,对刚性弹体侵彻Holmquist-Johnson-Cook(HJC)模型混凝土靶板和花岗岩靶板的过程进行数值模拟,通过数值模拟结果与试验结果及理论公式计算结果的对比,验证数值模拟结果的有效性.结果表明,在相同条件下,刚性弹体在花岗岩靶板中受到的阻力大于相应的混凝土靶板,而且在刚性弹体同样的初始侵彻速度下,弹体侵彻混凝土靶板后的残余速度明显高于弹体侵彻花岗岩靶板后的残余速度,混凝土靶板的侵彻深度也明显高于花岗岩靶板的侵彻深度.针对刚性弹体正侵彻两种靶板结果的分析表明,花岗岩靶板相比混凝土靶板在抗击弹体侵彻能力方面更显著,可为防护工程结构设计提供支撑和依据. 展开更多
关键词 刚性弹体 混凝土靶 花岗岩靶 HJC模型 残余速度 侵彻深度 防护工程
下载PDF
强噪声中检测微弱目标信号特征的量子信号处理算法 被引量:1
17
作者 庾天翼 李舜酩 +2 位作者 陆建涛 马会杰 龚思琪 《计算机集成制造系统》 EI CSCD 北大核心 2024年第2期482-495,共14页
随着噪声功率的增强,微弱目标信号的特征受噪声污染变得模糊且难以区分,导致微弱信号检测算法失效,提出一种可以保护目标信号特征的量子信号处理方法——局域半经典信号分析算法。详细介绍了算法实现量子化的原理和在量子域中保护目标... 随着噪声功率的增强,微弱目标信号的特征受噪声污染变得模糊且难以区分,导致微弱信号检测算法失效,提出一种可以保护目标信号特征的量子信号处理方法——局域半经典信号分析算法。详细介绍了算法实现量子化的原理和在量子域中保护目标信号特征的性质;给出算法步骤以及重要参数的计算方式;将所提算法与奇异值分解、小波阈值降噪算法结合进行了仿真分析和实验验证。结果表明,所提算法保护目标信号特征的能力可以帮助降噪算法检测极低信噪比的微弱信号,与其他方法结合可极大改善信噪比,准确提取信噪比为-30 dB的微弱目标信号,算法性能优越。 展开更多
关键词 微弱信号检测 量子信号处理 保护特征 局域半经典信号分析 奇异值分解 小波阈值降噪
下载PDF
一种乳腺钼靶检查辐射防护服的研发和设计
18
作者 黄夏珺 梁红 李博 《中国医学装备》 2024年第5期191-193,共3页
乳腺钼靶检查是一种常见的乳腺疾病筛查手段,但传统的乳腺钼靶检查用防护服存在问题,如配件组合繁琐、暴露部位多防护不到位、尺寸不合适等问题。为此,研发设计一款新型的乳腺钼靶检查辐射防护服,针对上述问题进行改良与优化,通过魔术... 乳腺钼靶检查是一种常见的乳腺疾病筛查手段,但传统的乳腺钼靶检查用防护服存在问题,如配件组合繁琐、暴露部位多防护不到位、尺寸不合适等问题。为此,研发设计一款新型的乳腺钼靶检查辐射防护服,针对上述问题进行改良与优化,通过魔术贴的粘贴切换,对未拍侧乳腺、甲状腺、胸腺、性腺等对X射线敏感的组织和器官进行有效防护。改进后的防护服能够提高乳腺钼靶检查者穿着防护服的舒适度和穿着体验,还可提高检查效率,为临床应用提供辐射防护安全保障。 展开更多
关键词 乳腺X线摄影 乳腺钼靶摄影 辐射防护 防护服
下载PDF
改进YOLOv5的棉田杂草检测
19
作者 杨明轩 陈琳 《现代电子技术》 北大核心 2024年第24期60-67,共8页
针对复杂环境下棉田杂草检测与识别困难等问题,提出一种改进YOLOv5的棉田杂草检测算法——CSTYOLOv5。首先,通过数据增强算法解决棉田杂草样本分布不均匀导致的模型训练效果不充分问题;其次,考虑到通道信息和方向位置信息,在主干网络中... 针对复杂环境下棉田杂草检测与识别困难等问题,提出一种改进YOLOv5的棉田杂草检测算法——CSTYOLOv5。首先,通过数据增强算法解决棉田杂草样本分布不均匀导致的模型训练效果不充分问题;其次,考虑到通道信息和方向位置信息,在主干网络中加入了坐标注意力机制;最后,在颈部网络中将Swin Transformer Block引入C3模块,得到新的C3STR模块,以保留全局上下文信息和多尺度特征。实验结果表明,CST-YOLOv5模型的mAP值达到95.1%,F1值达到90.4%,比原YOLOv5模型提高了4.8%、3.2%。所设计算法具有良好的鲁棒性,能精确识别多类杂草。 展开更多
关键词 杂草检测 YOLOv5 深度学习 目标检测 注意力机制 棉花保护
下载PDF
护肝片联合抗感颗粒治疗EBV肝损伤的网络药理学分析
20
作者 张馨慧 刘松涛 +1 位作者 王先滨 王海 《黑龙江医学》 2024年第3期376-382,共7页
目的:通过网络药理学联合分子对接技术探讨护肝片联合抗感颗粒治疗EB病毒(Epstein-Barr virus,EBV)肝损伤的分子机制。方法:利用TCMSP、HERB数据库和Swiss Target Prediction平台筛选和预测护肝片联合抗感颗粒的活性成分及潜在靶点。通... 目的:通过网络药理学联合分子对接技术探讨护肝片联合抗感颗粒治疗EB病毒(Epstein-Barr virus,EBV)肝损伤的分子机制。方法:利用TCMSP、HERB数据库和Swiss Target Prediction平台筛选和预测护肝片联合抗感颗粒的活性成分及潜在靶点。通过GeneCards数据库检索EBV肝损伤的相关基因。运用Cytoscape 3.9.1软件构建药物活性成分-靶点网络,并筛选出关键成分。对护肝片联合抗感颗粒治疗EBV肝损伤的潜在作用靶点进行GO及KEGG通路富集分析,并将其导入STRING平台,构建PPI网络,利用MCC和MNC算法筛选出核心靶点。最后,利用CB-Dock对关键成分与核心靶点进行分子对接。结果:共收集护肝片联合抗感颗粒的活性成分96个,护肝片联合抗感颗粒治疗EBV肝损伤的作用靶点57个。GO和KEGG通路富集分析结果主要与细胞因子受体结合、细胞因子活性、人巨细胞病毒感染等功能和通路相关。分子对接结果证实核心靶点STAT3、AKT1、JUN、TP53能稳定地与关键成分槲皮素、山柰酚、木犀草素、金合欢素、异鼠李素结合。结论:护肝片联合抗感颗粒主要通过槲皮素、山柰酚、木犀草素、金合欢素和异鼠李素等关键成分作用于STAT3、AKT1、JUN和TP53等核心靶点,参与细胞因子相关生物细胞过程的调节,最终起到治疗EBV肝损伤的作用。 展开更多
关键词 护肝片 抗感颗粒 EB病毒 肝损伤 网络药理学 分子对接 通路 靶点
下载PDF
上一页 1 2 21 下一页 到第
使用帮助 返回顶部