检索结果-南通市图书馆

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

肝硬化门静脉高压相关血清学指标研究进展

兰州大学学报（医学版） 2024年第5期50卷 87-94页

作者：蒋彤邓悦陈灵文皓石国庆遵义医科大学附属医院消化内科贵州遵义563000 遵义医科大学第五附属(珠海)医院消化内科广东珠海519100

门静脉高压(PH)是最常见的由肝硬化引起的一组临床综合征,其发生与肝纤维化、肝内血流阻力及血管生成等密切相关。肝硬化PH时,一些炎症介质、血管活性物质等血清学指标发生变化。近年来,这些指标逐渐被作为PH无创诊断的血清学标志物,可... 详细信息

门静脉高压(PH)是最常见的由肝硬化引起的一组临床综合征,其发生与肝纤维化、肝内血流阻力及血管生成等密切相关。肝硬化PH时,一些炎症介质、血管活性物质等血清学指标发生变化。近年来,这些指标逐渐被作为PH无创诊断的血清学标志物,可预测PH及肝硬化并发症的发生、发展。因此,本文就肝硬化PH相关血清学指标研究进展进行综述。

关键词：肝硬化门静脉高压血清学无创诊断

Theoretical and Experimental Study on Plug Shape Parameter of Press Piercing Mill

在线全文

学校读者我要写书评

暂无评论

Journal of Iron and Steel Research International 2003年第4期10卷 33-37页

作者： SUN deng-yue DU Feng-shan XU Shi-min Yanshan University

The characteristics of some elements in inoculant were analyzed. The effect of the morphology of instantaneous inoculant on its melting velocity was studied. When the inoculants pass through the same sieve number, the volume and the ratio of surface area to volume are different. It is evident from the theoretical analysis and experiment under some conditions that the melting velocity of inoculant depends on the morphology of inoculant. The morphology of inoculant during production should be controlled carefully.

关键词： instantaneous inoculant morphology melting velocity melted iron

Performance improvement of 5G positioning utilizing multi-antenna angle measurements

在线全文

学校读者我要写书评

暂无评论

Satellite Navigation 2022年第3期3卷 193-206,I0005页

作者： Wenfei Guo yue deng Chi Guo Shufeng Qi Jingrong Wang Wuhan University WuhanHubeiChina

Time delay-based the 5th Generation Mobile Communication Technology(5G)positioning is a main method to perform high-precision positioning in Global Navigation Satellite System(GNSS)denied ***,in practical applications,the occlusion of signals in a complex environment results in few observable base stations,which affects the reliability and accuracy of *** aim of this study is to improve the performance of the 5G positioning in complex environments with an insufficient number of observable base ***,the Angle of Departure(AOD)capability of multi-antennas is integrated into Multi-Round-Trip-Time(Multi-RTT)positioning,establishing a novel 5G RTT/AOD positioning ***,the influencing factors of positioning performance,including the Dilution of Precision(DOP)and the accuracy of the AOD measurements,is *** relationship between DOP and RTT/AOD positioning accuracy is ***,simulation experiments are performed on 5G positioning with the Multi-RTT and RTT/AOD methods in two scenarios with good and complex *** theoretical analysis and experimental results show that 5G positioning with the RTT/AOD method increases the horizontal and vertical accuracies by approximately 25 and 65%,respectively,compared with the Multi-RTT *** positioning reliability is also greatly *** proposed model can well solve the inefficiency of 5G positioning with the RTT method in scenarios where the number of base stations is less than three.

关键词： 5G positioning Angle of departure Positioning accuracy Positioning reliability

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

油气行业人工智能大模型应用研究现状及展望

石油勘探与开发 2024年第4期51卷 910-923页

作者：刘合任义丽李欣邓岳王勇涛曹倩雯杜金阳林志威汪文洁多资源协同陆相页岩油绿色开采全国重点实验室黑龙江大庆163000 中国石油勘探开发研究院北京100083 北京航空航天大学北京100191 北京大学北京100871 中国石油大学(北京) 北京102249

阐述了大模型技术的概念,总结了大模型技术的国内外研究现状,综述了大模型在垂直领域的应用现状,梳理了油气行业大模型应用面临的挑战,并对油气行业大模型应用进行了展望。现有大模型可粗略分为3类,即大语言模型、视觉大模型和多模态大... 详细信息

阐述了大模型技术的概念,总结了大模型技术的国内外研究现状,综述了大模型在垂直领域的应用现状,梳理了油气行业大模型应用面临的挑战,并对油气行业大模型应用进行了展望。现有大模型可粗略分为3类,即大语言模型、视觉大模型和多模态大模型。油气行业大模型应用刚刚起步,部分油气企业基于开源大语言模型,利用微调、检索增强等方式发布大语言模型产品,部分学者尝试利用视觉/多模态基础模型研发面向油气业务的场景模型,还有少数学者构建地震资料处理解释、岩心分析等领域的预训练基础模型。油气行业大模型应用面临数据量和数据质量难以支撑大模型训练、研发投入成本高、难以实现算法自主可控等挑战。油气行业在应用大模型时应始终聚焦油气主营业务需求,以大模型应用为契机,加强数据全生命周期管理,提升数据治理能力,推动融合算力建设,加强“人工智能+能源”复合团队建设,推动大模型技术自主可控。

关键词：基础模型大语言模型视觉大模型多模态大模型油气行业大模型预训练微调

同方期刊数据库

针刺通过增加前额叶皮层突触蛋白的表达对两种抑郁症动物模型的快速抗抑郁作用

在线全文

学校读者我要写书评

暂无评论

World Journal of Acupuncture-Moxibustion 2024年第2期34卷 117-129页

作者：宁百乐王志芳杨晴吴倩邓启粤高静傅文邓颖吴炳鑫黄熙畅王聪符文彬广州中医药大学第二附属医院广州510120 广州中医药大学广州510006 河南中医药大学第一附属医院郑州450006

Objective:To investigate the effect of acupuncture onset time and synaptic structure in two different models of ***:A total of 150 healthy male adult SPF C57BL/6J mice were divided into five time-point groups:1 h,3 h,6 h,12 h and 24 *** time-point group was further divided into three groups:the model,scopolamine and acupuncture groups with 10 rats *** were given forced swimming stimulation(15 min,once)before the intervention.A total of 200 healthy male adult specific pathogen-free(SPF)Sprague-Dawley(SD)rats were divided into 30 normal rats,and 170 modelling ones.A total of 90 rats were successfully modeled,and were randomly divided into three time-point groups:1 h,6 h and 24 *** each time-point group was further divided into the normal,model,scopolamine,and acupuncture *** unpredictable mild stress(CUMS)combined with individual feeding was used to establish the depressed rat *** sucrose preference test(SPT)and open field test(OFT)were used to evaluate the success of the *** were 10 rats in each *** acupuncture intervention was performed once for 20 min on"Baihui(GV20)","Yintang(GV29)","Hegu(LI4)",and"Taichong(LR3)"without any other operations for the corresponding *** groups were given corresponding *** to different time points,the forced swimming test(FST)was conducted in mice,and the FST and novelty-suppressed feeding test(NSFT)were measured in *** neurotransmitters(NE,DA,DOPAC,5-HT,5-HIAA,HVA)in the prefrontal cortex and hippocampus were detected with high performance liquid chromatography(HPLC).The expression of synapsin I,PSD95,p-mTOR,mTOR,and BDNF in the prefrontal cortex and hippocampus was determined by western ***:At the 1 h time point,compared with the model group,the immobility time was significantly decreased in the acupuncture group(P<0.05).At 3 h,6 h,12 h,and 24 h,compared with the model group,the immobility time was significantly reduced in both sco

关键词： Depression Acupuncture Rapidantidepressanteffect Synaptic proteins Prefrontal cortex

Mathematical foundation of turbulence generation-From symmetric to asymmetric Liutex

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2019年第3期31卷 632-636页

作者： Jian-ming Liu yue deng Yi-sheng Gao Sita Charkrit Chaoqun Liu School of Mathematics and Statistics Jiangsu Normal University Xuzhou 221116 China Department of Mathematics University of Texas at Arlington Arlington 76019 Texas USA Department of Physics University of Texas at Arlington Arlington 76019 Texas USA

Vortices have been regarded as the building blocks and muscles of turbulence for a long time. To better describe and analyze vortices or vortical structures, recently a new physical quantity called Liutex (previously named Rortex) is introduced to present the rigid rotation part of fluid motion (Liu et al. 2018). Since turbulence is closely related to the vortex, it can be postulated that there exists no turbulence without Liutex. According to direct numerical simulations (DNS) and experiments, forest of hairpin vortices has been found in transitional and low Reynolds number turbulent flows, while one-leg vortices are predominant in full developed turbulent flows. This paper demonstrates that the hairpin vortex is unstable. The hairpin vortex will be weakened or lose one leg by the shear and Liutex interaction, based on the Liutex definition and mathematical analysis without any physical assumptions. The asymmetry of the vortex is caused by the interaction of symmetric shear and symmetric Liutex since the smaller element of a pair of vorticity elements determines the rotational strength. For a 2-D fluid rotation, if a disturbance shear effects the larger element, the rotation strength will not be changed, but if the disturbance shear effects the smaller element, the rotation strength will be immediately changed due to the definition of the Liutex strength. For a rigid rotation, if the shearing part of the vorticity and Liutex present the same directions, e.g., clockwise, the Liutex strength will not be changed. If the shearing part of the vorticity and Liutex present different directions, e.g., one clockwise and another counterclockwise, the Liutex strength will be ***, the hairpin vortex could lose the symmetry and even deform to a one-leg vortex. The one-leg vortex cannot keep balance, and the chaotic motion and flow fluctuation are doomed. This is considered as the mathematical foundation of turbulence formation. The DNS results of boundary laye

关键词： Turbulence generation mathematical principle Liutex/Rortex asymmetry

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

四种融合降水产品在广西适用性评估

河南科学 2024年第5期42卷 705-713页

作者：卓健任晓炜黄珩白龙邓悦广西壮族自治区气象信息中心南宁530022 广西河池市气象局广西河池547000

基于2022年汛期广西陆面的降水资料,对国家气象信息中心的中国区域多源融合实况分析产品(RT1、RT2和NRT)和广西壮族自治区气象信息中心的二源融合降水产品(GXPAS)等四种融合降水产品进行适用性评估,评估指标为统计误差和技巧评分.非独... 详细信息

基于2022年汛期广西陆面的降水资料,对国家气象信息中心的中国区域多源融合实况分析产品(RT1、RT2和NRT)和广西壮族自治区气象信息中心的二源融合降水产品(GXPAS)等四种融合降水产品进行适用性评估,评估指标为统计误差和技巧评分.非独立检验结果表明,融合降水产品与自动站点吻合度高,在观测或估测有降水的情况下,表现最优的NRT产品有89.73%样本实况值等于观测值.独立检验结果表明,GXPAS综合表现稍优,特别是小时雨强[10,20)mm·h^(-1)区间.用最近邻法分析自动站与其邻近自动站的统计误差,分析得出在广西区域,水平距离自动站超过0.01°的位置,融合降水产品优于使用附近自动站观测数据.融合降水产品适用在无观测站区域或自动站数据未能及时上传时,作为降水的“真值”开展业务服务.

关键词：融合降水产品广西陆面检验评估独立检验

结膜入路睑袋整复术切口缝合处理和未缝合处理的疗效分析研究

在线全文

学校读者我要写书评

暂无评论

中国医疗美容 2024年第6期14卷 1-4页

作者：邓乐曲陈威乔冠群蔡薇南京医科大学第二附属医院医疗美容科江苏南京210000

目的探讨结膜入路睑袋整复术后切口缝合处理与未缝合处理与切口并发症的关系。方法回顾性分析2018年-2022年南京医科大学第二附属医院医疗美容科160例接受结膜入路睑袋整复术的患者,对比术后切口缝合处理与切口未缝合处理的切口并发症... 详细信息

目的探讨结膜入路睑袋整复术后切口缝合处理与未缝合处理与切口并发症的关系。方法回顾性分析2018年-2022年南京医科大学第二附属医院医疗美容科160例接受结膜入路睑袋整复术的患者,对比术后切口缝合处理与切口未缝合处理的切口并发症发生情况及术后6个月恢复情况。切口并发症如延迟愈合、感染、手术3天后渗血、切口内软组织疝出、切口过长导致的对合不良、错位愈合及瘢痕不平整等。结果结膜入路睑袋整复术后切口进行缝合处理的患者缝合并未出现角膜磨损等不良反应,并且切口并发症发生率显著低于未行缝合处理的患者。结论结膜入路睑袋整复术后切口缝合与切口不缝合相比,无角膜损伤,且切口并发症发生率更低,术后6个月的愈合效果更佳,有临床推广应用价值。

关键词：睑袋结膜入路睑袋整复术结膜愈合切口缝合

唐山市PM_(2.5)和O_(3)的演变特征及其对大气复合污染的协同影响

在线全文

学校读者我要写书评

暂无评论

环境科学 2024年第8期45卷 4385-4397页

作者：韩力慧兰童程水源王迎澳齐超楠田健王海燕韩登越王慎澳北京工业大学环境与生命学部北京100124 区域大气复合污染防治北京市重点实验室北京100124

通过采集唐山市2015~2021年7年间大气污染物PM_(2.5)、O_(3)、SO_(2)、NO_(2)CO浓度,以及气象要素温度(T)、相对湿度(RH)、风速等相关数据,结合相关性分析和后向轨迹聚类分析技术,分析研究了唐山市近7年间PM_(2.5)和O_(3)不同时段的变... 详细信息

通过采集唐山市2015~2021年7年间大气污染物PM_(2.5)、O_(3)、SO_(2)、NO_(2)CO浓度,以及气象要素温度(T)、相对湿度(RH)、风速等相关数据,结合相关性分析和后向轨迹聚类分析技术,分析研究了唐山市近7年间PM_(2.5)和O_(3)不同时段的变化特征,及其影响因素,探讨了气团传输对PM_(2.5)和O_(3)污染的贡献,揭示了PM_(2.5)和O_(3)对大气复合污染的协同影响机制.结果表明,唐山市2015~2021年间PM_(2.5)浓度呈逐年下降的趋势,而O_(3)浓度则呈现出单峰态变化趋势,峰值出现在2017年.PM_(2.5)和O_(3)浓度均呈现出明显的季节变化,其中PM_(2.5)表现为冬季最高夏季最低的特征,而O_(3)则表现为夏季最高而冬季最低的特征.此外,PM_(2.5)的日变化呈双峰态分布,峰值分别发生在工作日早高峰和晚高峰期间.O_(3)日变化则呈单峰态分布,峰值出现在下午紫外线照射较强时段.PM_(2.5)主要受SO_(2)、NO_(2)和CO的正向影响,而O_(3)则主要受太阳辐射强度和温度的正向影响.在不同污染背景下,PM_(2.5)和O_(3)会受到来自不同方向气团传输的影响.PM_(2.5)和O_(3)对大气复合污染的协同作用在诸多因素的共同影响下,呈现出冬季明显的负向影响,而春、夏和秋季则明显的正向影响.在不同污染背景下,当PM_(2.5)浓度超过150μg·m^(-3)时,PM_(2.5)和O_(3)的协同作用则表现为明显的负向作用.

关键词： PM_(2.5) O_(3) 协同作用复合污染气团传输