检索结果-南通市图书馆

维普期刊数据库博看期刊

Theoretical and experimental studies on high-power laser-induced thermal blooming effect in chamber with different gases

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2022年第8期31卷 530-535页

作者： Xiangyizheng wu Jian Xu Keling Gong Chongfeng Shao Yang Kou Yuxuan Zhang Yong bo Qinjun Peng Key Laboratory of Solid-State Laser Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Key Laboratory of Functional Crystal and Laser Technology Technical Institute of Physics and ChemistryChinese Academy of SciencesBeijing 100190China Institute of Optical Physics and Engineering Technology Qilu ZhongkeJinan 250000China University of Chinese Academy of Sciences Beijing 100190China

High-power laser induced thermal blooming effects in a closed chamber with three different gases are investigated theoretically and experimentally in this work. In the theoretical treatment, an incompressible gas turbulent model is *** the numerical simulation the gas refractive index as a function of both the temperature and pressure is taken into consideration. In the experimental study the pump-probe technology is adopted. A high-power 1064-nm fiber laser with maximum output power of 12 k W is used to drive the gas thermal blooming, and a 50-m W high-beam-quality 637-nm laser diode(LD)is used as a probe beam. The influences of the gas thermal blooming in the chamber on the probe beam wavefront and beam quality are analyzed for three different gases of air, nitrogen, and helium, respectively. The results indicate that nitrogen is well suitable for restraining thermal blooming effect for high-power laser. The measured data are in good agreement with the simulated results.

关键词： laser radiation numerical simulation propagation thermal blooming

Assessment of hepatic functional reserve by cirrhosis grading and liver volume measurement using CT

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2007年第29期13卷 3956-3961页

作者： rong Tu Li-Ping Xia An-Le Yu Ling wu Department of Radiology of Affiliated Hospital of Hainan Medical College Cancer Research Center of Hainan Medical College Haikou 571101 Hainan Province China Department of Surgery of Affiliated Hospital of Hainan Medical College Haikou 571101 Hainan Province China Department of Statistics of Hainan Medical College Haikou 571101 Hainan Province China

AIM： To explore a method for quantitative assessment of hepatic functional reserve by combining computed tomography （CT） volumetry with CT grading of liver cirrhosis before liver resection in patients with hepatocellular carcinoma. METHODS： CT images of 55 patients undergoing liver resection were studied prospectively. The degree of liver cirrhosis was referred as ＂CT grade＂ and the percentage of remnant liver volume （PRLV） [PRLV = predicted RLV/predicted total liver volume （PTLV） × 100%; PTLV （mL） = 121.75 ＋ 16.49 × body mass （kg）] were calculated by adding slice by slice of CT liver images. The postoperative RLV, pathologic stages of liver fibrosis in non-tumor area and survival time in these cases were analyzed. RESULTS： There was a significant difference in survival time between the group with PRLV ≤ 50% and the group with PRLV 〉 50% （X^2= 4.988, P = 0.026）, and between the group with CT grade 0/1 and the group with CT grade 2/3 （X^2= 5.429, P = 0.026）. With combination of the both parameters, an oblique line was identified according to the distribution of 32 survivors versus 23 deceased subjects. The mortality rate above the line was 7.1% （1/14）, and that below the line was 53.7% （22/41）, indicating a significant difference between the two rates （X^2 = 9.281, P = 0.002, P 〈 0.05）. CONCLUSION： PRLV and CT grades are significantly correlated with hepatic functional reserve. The predicted line using these two parameters is useful in candidates undergoing liver resection for judging hepatic functional reserve.

关键词： Hepatic functional reserve Liver cirrhosis Computed tomography Hepatocellular carcinoma

AFP阴性肝硬化肝癌MRI与CEUS表现及诊断价值分析

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

中国CT和MRI杂志 2024年第1期22卷 94-96页

作者：潘家琦李强马献武王思博于强齐齐哈尔市中医医院影像科黑龙江齐齐哈尔161000

目的分析甲胎蛋白(AFP)阴性肝硬化肝癌磁共振成像(MRI)与超声造影(CEUS)表现及诊断价值。方法选取2020年6月~2022年6月我院AFP阴性肝硬化肝癌患者62例为肝癌组,同期选取肝硬化结节患者44例为结节组。均行MRI、CEUS检查。比较两组临床资... 详细信息

目的分析甲胎蛋白(AFP)阴性肝硬化肝癌磁共振成像(MRI)与超声造影(CEUS)表现及诊断价值。方法选取2020年6月~2022年6月我院AFP阴性肝硬化肝癌患者62例为肝癌组,同期选取肝硬化结节患者44例为结节组。均行MRI、CEUS检查。比较两组临床资料、MRI表现、CEUS表现,分析MRI、CEUS及MRI联合CEUS对增生结节及早期肝癌的诊断价值。结果肝癌组与结节组性别、年龄、体质量指数、肝硬化病程、AFP、AST、ALT、病灶直径比较,P>0.05,因此不具有统计学意义。MRI表现:两组在T1WI、T2WI以及DWI等方面的信号没有明显差异;而在动态增强扫描中,肝癌组的动脉期存在显著强化,门脉期及延迟期造影剂迅速廓清,而结节组表现各异,无明显规律;肝癌组病灶ADC值低于结节组(P<0.05)。CEUS表现:不同时相增强程度:肝癌组与结节组CEUS动脉期、门脉期、延迟期增强强度比较,差异有统计学意义(P<0.05);肝癌组CEUS起始时间、达峰时间短于结节组,峰值强度、曲线下面积、曲线尖度高于结节组(P<0.05)。以病理结果为金标准,MRI、CEUS对AFP阴性肝癌及肝硬化结节均具有较高的诊断一致性,MRI联合CEUS诊断敏感性为98.39%(61/62),特异性为88.64%(39/44),准确性为94.34%(100/106),阳性预测值为92.42%(61/66),阴性预测值为97.50%(39/40),Kappa值为0.863;MRI联合CEUS诊断敏感性、Kappa值高于单独诊断(P<0.05)。结论AFP阴性肝硬化肝癌具有一定特征的MRI与CEUS表现,二者联合可提高对AFP阴性肝硬化肝癌的鉴别诊断价值。

关键词：肝硬化磁共振成像超声造影增生结节甲胎蛋白早期肝癌诊断

意大利蜜蜂工蜂幼虫肠道发育过程中lncRNA的表达谱和调控作用

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

昆虫学报 2024年第8期67卷 1050-1062页

作者：赵浩东臧贺叶道有陈颖王宁吴鹰蒋海宾冯睿蓉陈大福熊翠玲郭睿福建农林大学蜂学与生物医药学院福州350002 天然生物毒素国家地方联合工程实验室福州350002 福建省蜂疗研究所福州350002 吉林省养蜂科学研究所吉林132000 福建农业职业技术学院福州350000

【目的】解析意大利蜜蜂Apis mellifera ligustica工蜂幼虫肠道发育过程中的长链非编码RNA(long non-coding RNA,lncRNA)差异表达谱,并揭示差异表达lncRNA(differentially expressed lncRNA,DElncRNA)在幼虫肠道发育中的调控作用。【方法】基于前期获得的意大利蜜蜂工蜂4,5和6日龄幼虫肠道转录组数据(分别为Am4,Am5和Am6),利用相关软件筛选Am4 vs Am5比较组和Am5 vs Am6比较组中的DElncRNA,分析DElncRNA和两个比较组中共同上调和下调lncRNA的顺式调控作用及竞争性内源RNA(competing endogenous RNA,ceRNA)的调控作用。通过RT-qPCR验证转录组数据的可靠性。【结果】在Am4 vs Am5比较组中筛选出214条上调和251条下调lncRNA,在Am5 vs Am6比较组中筛选出141条上调和332条下调lncRNA;两个比较组共有的上调和下调lncRNA分别为7和16条。Am4 vs Am5比较组中的DElncRNA潜在调控250个邻近基因,涉及细胞进程等28个GO条目及Wnt信号通路等58条KEGG通路;Am5 vs Am6比较组中的DElncRNA潜在调控295个邻近基因,涉及细胞部分等35个GO条目及FoxO信号通路等73条KEGG通路;上述两个比较组中共有的7个上调lncRNA潜在调控10个邻近基因,涉及1个GO条目及代谢通路、谷胱甘肽代谢和核质转运等7条KEGG通路。共有的16个下调lncRNA潜在调控27个邻近基因,涉及8个GO条目及精氨酸生物合成、谷胱甘肽代谢和代谢通路等13条KEGG通路。此外,Am4 vs Am5比较组中的49条DElncRNA可靶向16个差异表达miRNA(differentially expressed miRNA,DEmiRNA)进而靶向122条差异表达mRNA(differentially expressed mRNA,DEmRNA),可注释到代谢进程等24个GO条目和Wnt信号通路等21条KEGG通路。Am5 vs Am6比较组中的38条DElncRNA可靶向8条DEmiRNA进而靶向67条DEmRNA,可注释到催化活性等21个GO条目和FoxO信号通路等10条KEGG通路;上述两个比较组共有的1条下调lncRNA MSTRG.10589.2可靶向ame-miR-6052和miR-511-y,进而靶向29条DEmRNA。RT-qPCR结果显示随机选取的7条DElncRNA的相对表达量与测序数据一致,证实了所用转录组数据的可靠性。【结论】意大利蜜蜂工蜂幼虫肠道发育过程伴随着lncRNA的动态差异表达,DElncRNA可通过顺式作用和ceRNA网络潜在参与对幼虫肠道发育的调控,在幼虫肠道发育中潜在发挥重要的调控作用。

关键词：意大利蜜蜂工蜂幼虫长链非编码RNA 肠道发育

在线全文

学校读者我要写书评

暂无评论

隧道施工针梁台车设计与有限元分析

机械研究与应用 2024年第2期37卷 56-58页

作者：魏波彭学军陈武林刘丽燕盈萍中铁五局集团第一工程有限责任公司湖南长沙410117 长沙理工大学汽车与机械工程学院湖南长沙410114

针梁台车作为圆形隧洞衬砌的一种专用设备,在隧道施工过程中发挥着不可或缺的作用。该文主要针对针梁台车在隧道拐弯处存在的问题进行结构的改进设计,应用SolidWorks软件对针梁台车各部件进行建模,并通过SolidWorks Simulation平台对针... 详细信息

针梁台车作为圆形隧洞衬砌的一种专用设备,在隧道施工过程中发挥着不可或缺的作用。该文主要针对针梁台车在隧道拐弯处存在的问题进行结构的改进设计,应用SolidWorks软件对针梁台车各部件进行建模,并通过SolidWorks Simulation平台对针梁结构进行有限元分析。结果显示:改进后的针梁台车满足使用的强度要求,所得结论可为针梁台车的后续特性研究提供理论指导。

关键词：针梁台车结构设计有限元分析 SolidWorks

甘蓝型油菜 BnWSD 家族基因鉴定及其在干旱胁迫下的表达特征

在线全文

学校读者我要写书评

暂无评论

江苏农业学报 2024年第7期40卷 1170-1181页

作者：万军斌王旺田孙万仓马骊武军艳刘丽君蒲媛媛张岩李治忠周蓉甘肃农业大学生命科学技术学院/甘肃省干旱生境作物学重点实验室甘肃兰州730070 甘肃省油菜工程技术研究中心甘肃兰州730070

干旱胁迫能诱导作物蜡酯合成酶/二酰甘油酰基转移酶基因WSD(wax synthase/diacylglycerol acyltransferase)的表达。为明确甘蓝型油菜BnWSD家族基因的理化性质及其对干旱胁迫的响应特征,本研究基于甘蓝型油菜转录组数据库,利用生物信息... 详细信息

干旱胁迫能诱导作物蜡酯合成酶/二酰甘油酰基转移酶基因WSD(wax synthase/diacylglycerol acyltransferase)的表达。为明确甘蓝型油菜BnWSD家族基因的理化性质及其对干旱胁迫的响应特征,本研究基于甘蓝型油菜转录组数据库,利用生物信息学方法从甘蓝型油菜基因组中筛选BnWSD家族基因并对其结构、染色体定位、系统进化树及其编码蛋白质的理化性质、结构、保守基序、顺式作用元件等进行分析,并以陇油10号为试验材料,通过干旱胁迫处理明确BnWSD家族基因成员的表达特性。结果表明,甘蓝型油菜基因组中共鉴定到36个BnWSD家族基因,可分为3个亚家族,其编码蛋白质的氨基酸数量为105~538个,等电点为6.32~9.63;36个BnWSD家族基因共有8个保守基序,每个基因含有2~8个保守基序,motif 2是该家族共有的功能基序,在进化上较为保守;甘蓝型油菜BnWSD基因启动子区域存在11个与光响应、激素应答、干旱胁迫应答等相关的顺式作用元件。甘蓝型油菜不同器官中BnWSD基因的相对表达量存在差异,叶和茎中相对表达量较高,而根和花中的相对表达量较低或不表达。随着干旱程度加深,甘蓝型油菜叶片中BnWSD1-1、BnWSD2、BnWSD8、BnWSD9、BnWSD12、BnWSD18-1、BnWSD20-1、BnWSD24-1等基因的相对表达量呈增加趋势。综上,BnWSD基因与甘蓝型油菜抗旱性能密切相关,本研究结果为进一步解析甘蓝型油菜抗旱机制、明确BnWSD基因家族在表皮蜡质累积中的作用及甘蓝型油菜抗旱性品种选育提供了依据。

关键词：甘蓝型油菜 WSD基因家族鉴定干旱胁迫

维普期刊数据库博看期刊

Up-conversion luminescence tuning in Er^3+ -doped ceramic glass by femtosecond laser pulse at different laser powers

在线全文

学校读者我要写书评

暂无评论

Chinese Physics B 2018年第12期27卷 224-230页

作者： Wen-Jing Cheng Guo Liang Ping wu Shi-Hua Zhao Tian-Qing Jia Zhen-rong Sun Sift-An Zhang School of Electronic &Electrical Engineering Shangqiu Normal UniversityShangqiu 476000China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

The up-conversion luminescence tuning of rare-earth ions is an important research topic for understanding luminescence mechanisms and promoting related applications. In this paper, we experimentally study the up-conversion luminescence tuning of Er3+-doped ceramic glass excited by the unshaped, V-shaped and cosine-shaped femtosecond laser field with different laser powers. The results show that green and red up-conversion luminescence can be effectively tuned by varying the power or spectral phase of the femtosecond laser field. We further analyze the up-conversion luminescence tuning mechanism by considering different excitation processes, including single-photon absorption(SPA), two-photon absorption(TPA), excited state absorption(ESA), and energy transfer up-conversion(ETU). The relative weight of TPA in the whole excitation process can increase with the increase of the laser power, thereby enhancing the intensity ratio between green and red luminescence(I547/I656). However, the second ETU(ETU2) process can generate red luminescence and reduce the green and red luminescence intensity ratio I547/I656, while the third ESA(ESA3) process can produce green luminescence and enhance its control efficiency. Moreover, the up-conversion luminescence tuning mechanism is further validated by observing the up-conversion luminescence intensity, depending on the laser power and the down-conversion luminescence spectrum under the excitation of 400-nm femtosecond laser pulse. These studies can present a clear physical picture that enables us to understand the up-conversion luminescence tuning mechanism in rare-earth ions, and can also provide an opportunity to tune up-conversion luminescence to promote its related applications.

关键词： rare-earth ions up-conversion luminescence pulse shaping two-photon absorption

Fatal progressive ascending encephalomyelitis caused by herpes B virus infection:first case from China

在线全文

学校读者我要写书评

暂无评论

World Journal of Emergency Medicine 2022年第4期13卷 330-333页

作者： Tian-peng Zhang Zhen Zhao Xue-lian Sun Miao-rong Xie Feng-kui Liu Yong-bo Zhang Lu-xi Shen Guo-xing Wang Department of Emergency Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China Department of Neurology Beijing Friendship HospitalCapital Medical UniversityBeijing 100050China

Dear editor,Herpes B virus(BV),also known as Macacine herpesvirus 1(family:Herpesviridae,subfamily:Alphaherpesvirinae,genus:Simplexvirus),officially designated by the International Committee on the Taxonomy of Viruses,exhibits serologic cross-reactivity with other members of the genus Simplexvirus,namely HSV type 1(HSV-1),the causative agent of oral herpetic ulcers(cold sores)in humans and HSV type 2(HSV-2),the agent of human genital herpes.[1]

关键词： agent editor Alpha

Emergence of photoluminescence on bulk MoS2 by laser thinning and gold particle decoration

在线全文

学校读者我要写书评

暂无评论

Nano Research 2018年第9期11卷 4574-4586页

作者： Lili Gong Qi Zhang Liangjun Wang Jianfeng wu Cheng Han bo Lei Wei Chen Goki Eda Kuan Eng Johnson Goh Chorng Haur Sow Department of Physics National University of Singapore Singapore 117542 Singapore Department of Chemistry National University of Singapore Singapore 117542 Singapore Centre for Advanced 2D Materials and Graphene Research Centre National University of Singapore 6 Science Drive 2 Singapore 117546 Singapore Institute of Materials Research and Engineering Agency for Science Technology and Research (A＊STAR) 2 Fusionopolis Way Innovis #08-03 Singapore 138634 Singapore

We demonstrate a facile and effective approach to significantly improve the photoluminescence of bulk MoS2 via laser thinning followed by gold particle decoration. Upon laser thinning of exfoliated bulk MoSz photoluminescence emerges from the laser-thinned region. After further treatment with an AuCl3 solution, gold particles self-assemble on the laser-thinned region and thick edges, further increasing the fluorescence of bulk MoS2 28 times and the Raman response 3 times. Such fluorescence enhancement can be attributed to both surface plasmon resonance and p-type doping induced by gold particles. The combination of laser thinning and AuCl3 treatment enables the functionalization of bulk MoS2 for optoelectronic applications. It can also provide a viable strategy for mask-free and area-selective p-type doping on single MoS2 flakes.

关键词： bulk MoS photoluminescence laser thinning gold particle plasmonic effect doping