检索结果-南通市图书馆

水平微肋管内基于分层流流型的沸腾传热理论模型

在线全文

学校读者我要写书评

暂无评论

工程热物理学报 2005年第2期26卷 249-252页

作者：王跃社白博峰陈永利 hiroshi honda 西安交通大学动力工程多相流国家重点实验室陕西西安710049 日本九州大学

本文提出了基于气液分层流的水平螺旋微肋管内沸腾传热理论预测模型。在模型建立过程中,采用了与开发微肋管冷凝分层流模型类似的理论处理方法。在气液分界面以上区域,相邻微肋之间的沟槽内的半月形液面形状取决于重力和表面张力之间的... 详细信息

本文提出了基于气液分层流的水平螺旋微肋管内沸腾传热理论预测模型。在模型建立过程中,采用了与开发微肋管冷凝分层流模型类似的理论处理方法。在气液分界面以上区域,相邻微肋之间的沟槽内的半月形液面形状取决于重力和表面张力之间的静力平衡关系,其中半月形液面中的薄液膜区域的传热特性由先前提出的薄液膜蒸发模型预测;分层流液体中的传热特性由Mori等建立的基于实验数据的关联式确定。将模型理论预测值与已由的四种不同结构的微肋管、三种有机工质下得到的实验数据进行了比较,结果表明,只要不发生管内部分烧涸现象,在Fr0<2.5时,理论预测值和实验数据符合得相当好。

关键词：微肋管沸腾分层流理论分析有机工质

Tiglic Acid as Male Sex Pheromone of the Yellow Peach Moth,Conogethes punctiferalis (Lepidoptera:Pyralidae)

在线全文

学校读者我要写书评

暂无评论

Tiglic Acid as Male Sex Pheromone of the Yellow Peach Moth,C...

Image quality and diagnostic performance of free-breathing diffusion-weighted imaging for hepatocellular carcinoma

The First Asia—Pacific Conference on Chemical Ecology

作者： hiroshi honda Takayoshi Kimur Institute of Agriculture and Forestry University of Tsukuba1-1-1Ten-nodaiTsukubaIbaraki3058572 Japan

Male hairpencil scent of the yellow peach moth,Conogethes punctiferalis was analyzed and its function was studied.A component detected by GC-EAD,was identified as(E)-2-methyl-2-butenoic acid(tiglic acid) by GC,*** had no tiglic acid right after emergence but tiglic acid concentrations increased to an average of 1-2 g/male by 2 *** with hairpencils from which tiglic acid was washed away by hexane and with removed haiipencils showed significantly lower mating success than control *** mating success

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

World Journal of Hepatology 2017年第14期9卷 657-666页

作者： Yukihisa Takayama Akihiro Nishie Yoshiki Asayama Kousei Ishigami Daisuke Kakihara Yasuhiro Ushijima Nobuhiro Fujita Ken Shirabe Atsushi Takemura hiroshi honda Department of Radiology Kitakyushu Municipal Medical Center Department of Clinical Radiology Graduate School of Medical SciencesKyushu University Department of Hepatobiliary and Pancreatic Surgery Gunma UniversityGraduate School of Medicine Philips Electronics Japan

AIM To retrospectively evaluate the diagnostic performance of free-breathing diffusion-weighted imaging(FB-DWI) with modified imaging parameter settings for detecting hepatocellular carcinomas(HCCs).METHODS Fifty-one patients at risk for HCC were scanned with both FB-DWI and respiratory-triggered DWI with the navigator echo respiratory-triggering technique(RTDWI).Qualitatively,the sharpness of the liver contour,the image noise and the chemical shift artifacts on each DWI with b-values of 1000 s/mm2 were independently evaluated by three radiologists using 4-point *** the image quality scores of each observer between the two DWI methods,using the Wilcoxon signed-rank ***,we compared the signal-to-noise ratios(SNRs) of the liver parenchyma and lesion-to-nonlesion contrast-to-noise ratios(CNRs) after measuring the signal intensity on each DWI with a b-factor of 1000 s/*** average SNRs and CNRs between the two DWI methods were compared by the paired *** detectability of HCC on each DWI was also analyzed by three *** detectability provided by the two DWI methods was compared using Mc Nemar's *** For all observers,the averaged image quality scores of FB-DWI were:Sharpness of the liver contour [observer(Obs)-1,3.08 ± 0.81;Obs-2,2.98 ± 0.73;Obs-3,3.54 ± 0.75],those of the distortion(Obs-1,2.94 ± 0.50;Obs-2,2.71 ± 0.70;Obs-3,3.27 ± 0.53),and the chemical shift artifacts(Obs-1,3.38 ± 0.60;Obs-2,3.15 ± 1.07;Obs-3,3.21 ± 0.85).The averaged image quality scores of RTDWI were:Sharpness of the liver contour(Obs-1,2.33 ± 0.65;Obs-2,2.37 ± 0.74;Obs-3,2.75 ± 0.81),distortion(Obs-1,2.81 ± 0.56;Obs-2,2.25 ± 0.74;Obs-3,2.96 ± 0.71),and the chemical shift artifacts(Obs-1,2.92 ± 0.59;Obs-2,2.21 ± 0.85;Obs-3,2.77 ± 1.08).All image quality scores of FB-DWI were significantly higher than those of RT-DWI(P < 0.05).The average SNR of the normal liver parenchyma by FB-DWI(11.0 ± 4.8) was not significantly different from that shown b

关键词：散开加权成像肝磁性的回声成像 Hepatocellular 癌免费呼吸的技术

Fibrosis in nonalcoholic fatty liver disease: Noninvasive assessment using computed tomography volumetry

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

World Journal of Gastroenterology 2016年第40期22卷 8949-8955页

作者： Nobuhiro Fujita Akihiro Nishie Yoshiki Asayama Kousei Ishigami Yasuhiro Ushijima Yukihisa Takayama Daisuke Okamoto Ken Shirabe Tomoharu Yoshizumi Kazuhiro Kotoh Norihiro Furusyo Tomoyuki Hida Yoshinao Oda Taisuke Fujioka hiroshi honda Department of Clinical Radiology Graduate School of Medical Sciences Kyushu University Department of Advanced Imaging and Interventional Radiology Graduate School of Medical Sciences Kyushu University Department of Radiology Informatics and Network Graduate School of Medical Sciences Kyushu University Department of Surgery and Sciences Graduate School of Medical Sciences Kyushu University Department of Medicine and Bioregulatory Science Graduate School of Medical Sciences Kyushu University Department of General Internal Medicine Graduate School of Medical Sciences Kyushu University Department of Anatomic Pathology Graduate School of Medical Sciences Kyushu University CT Application Philips Electronics Japan Medical Systems

AIM To evaluate the diagnostic performance of computed tomography(CT) volumetry for discriminating the fibrosis stage in patients with nonalcoholic fatty liver disease(NAFLD).METHODS A total of 38 NAFLD patients were enrolled. On the basis of CT imaging, the volumes of total, left lateral segment(LLS), left medial segment, caudate lobe, and right lobe(RL) of the liver were calculated with a dedicated liver application. The relationship between the volume percentage of each area and fibrosis stage was analyzed using Spearman's rank correlation coefficient. A receiver operating characteristic(ROC) curve analysis was performed to determine the accuracy of CT volumetry for discriminating fibrosis *** The volume percentages of the caudate lobe and the LLS significantly increased with the fibrosis stage(r = 0.815, P < 0.001; and r = 0.465, P = 0.003, respectively). Contrarily, the volume percentage of the RL significantly decreased with fibrosis stage(r =-0.563, P < 0.001). The volume percentage of the caudate lobe had the best diagnostic accuracy for staging fibrosis, and the area under the ROC curve values for discriminating fibrosis stage were as follows: ≥ F1, 0.896; ≥ F2, 0.929; ≥ F3, 0.955; and ≥ F4, 0.923. The best cut-off for advanced fibrosis(F3-F4) was 4.789%, 85.7% sensitivity and 94.1% *** The volume percentage of the caudate lobe calculated by CT volumetry is a useful diagnostic parameter for staging fibrosis in NAFLD patients.

关键词：不含酒精的脂肪肝疾病计算断层摄影术容量测定纤维变性舞台不含酒精的 steatohepatitis

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

大正时期日本民主运动的发展及其影响因素

宁波大学学报（人文科学版） 2022年第2期35卷 125-132页

作者：陶信达本田洋清华大学社会科学学院北京100084 东京大学人文社会系研究科东京1130033

在"天皇机关说"与"民本主义"的理论指导下,大正民主运动向藩阀专制发起前所未有的攻击,提出了"拥护宪政"的口号。以"大正政变"为起点的反对专制主义和扩军备战的群众运动,揭开了大正民主运动的序幕。由于大正天皇对政治体制的控制相对宽... 详细信息

在"天皇机关说"与"民本主义"的理论指导下,大正民主运动向藩阀专制发起前所未有的攻击,提出了"拥护宪政"的口号。以"大正政变"为起点的反对专制主义和扩军备战的群众运动,揭开了大正民主运动的序幕。由于大正天皇对政治体制的控制相对宽松,在资产阶级民主派的推动下,民主自由思想迅速传播开来,青年运动、学生运动、工农运动等相继而起,打破了藩阀势力独占政治阵地的局面。大正民主运动作为日本资产阶级民主派登上政治舞台的第一次表演,从实现"建立政党内阁"与"推行普选制度"两大政治课题的方面来说,它是具有划时代意义的历史事件。但是,由于资产阶级民主派本身的软弱性和客观条件的限制,"护宪三派"组成的政党内阁未能对枢密院、贵族院、军部等特权机构进行实质性的改革,日本仍旧在天皇制军国主义的压迫之下,民主革命的任务并没有完成。

关键词：大正天皇民主运动政党政治藩阀专制

Contrast-Enhanced CT Colonography Features of Rectal Carcinoid Tumors

在线全文

学校读者我要写书评

暂无评论

Advances in Computed Tomography 2014年第2期3卷 24-30页

作者： Daisuke Tsurumaru Satoshi Kawanami Yusuke Nishimuta Mitsutoshi Miyasaka Yoshiki Asayama hiroshi honda Department of Clinical Radiology Graduate School of Medical Sciences Kyushu University Fukuoka Japan

Purpose: The purpose of this study was to retrospectively assess the detectability and enhancement pattern of rectal carcinoid tumors on contrast-enhanced computed tomography colonography (CE-CTC). Methods: The study sample consisted of 12 lesions in nine patients of rectal carcinoid tumors. To evaluate the detectability, two radiologists reviewed axial and 3D images including air enema (AE), virtual endoscopy (VE), and virtual colon dissection (VCD). To determine the contrast enhancement pattern of the tumors, the CT attenuation value of each lesion was measured in three phases. Results: Four of the 12 lesions (33%) were detected on axial images in patients in both the prone and supine positions, the sizes of which were 6 mm or larger. Seven lesions (58%), including the four lesions mentioned above, were detected on 3D images including AE and VE in patients in the prone position, the sizes of which were 5 mm or larger. The ranges of CT attenuation values of the lesions at 40 s, 70 s and 240 s were 112 - 147, 116 - 140 and 82 - 97 HU, respectively. Conclusion: Rectal carcinoid tumors are challenging to detect on CE-CTC. They demonstrated enhancement at the early phase and washout at the delayed phase on CE-CTC.

关键词： Carcinoid Tumors Rectum Contrast Enhancement CT Colonography

Full Penetration Welding of Thick Steel Plates Using 20 kW CO2 Laser

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

Full Penetration Welding of Thick Steel Plates Using 20 kW C...

第二届先进钢铁结构材料国际会议

作者： TSUKAMOTO Susumu ARAKANE Goro honda hiroshi KAWAGUCHI Isao Steel Research Center National Institute for Materials Science Tsukuba Ibaraki Japan

Full penetration laser welding of thick steel plates has been carried out using a 20 kW CO laser facility. Dynamic keyhole behaviour has been observed using an x-ray transmission imaging system to elucidate the formation mechanism of the weld defects. Relatively wide optimum power range to prevent the porosity can be attained when the back surface is shielded by inert gas. However, hot cracking susceptible weld sections are formed due to significant perturbation of the keyhole caused by indissoluble back shielding gas. The keyhole is stabilised if the back surface is not shielded by inert gas. However, large porosities are easily formed near the bottom due to super saturation of nitrogen, which is supplied from the plasma formed on the back surface. A small amount of aluminium addition in the base metal is effective to prevent the porosity due to denitrification effect of aluminium, even if the back surface is not shielded.

关键词： Laser Welding Porosity Hot Cracking Keyhole Denitrification

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

微结构表面上FC-72的强化沸腾换热研究

工程热物理学报 2006年第2期27卷 247-250页

作者：魏进家本田博司西安交通大学动力工程多相流国家重点实验室陕西西安710049 九州大学日本福冈8168580

针对电子器件的高效冷却问题,对表面加工有微结构的硅片上FC-72的池沸腾换热性能进行了实验研究。测试了四种表面微结构,采用化学蒸汽沉积法在芯片表面生成-SiO2薄层所形成的亚微米粗糙面(Chip CVD),采用溅射方法在芯片表面生成-SiO2薄... 详细信息

针对电子器件的高效冷却问题,对表面加工有微结构的硅片上FC-72的池沸腾换热性能进行了实验研究。测试了四种表面微结构,采用化学蒸汽沉积法在芯片表面生成-SiO2薄层所形成的亚微米粗糙面(Chip CVD),采用溅射方法在芯片表面生成-SiO2薄层,然后再对SiO2层进行湿式腐蚀技术处理形成的亚微米粗糙面(Chip E),采用一系列微电子加工技术生成的微米级双重入口洞穴(Chip CAVITY)以及采用干式腐蚀方法生成的方柱微结构(Chip PF)。实验所得的沸腾曲线表明,所有微结构表面与光滑面(Chip S)相比都显示出较大的强化沸腾换热效果,临界热流密度按芯片 S、E、CVD、CAVITY和PF的顺序增大。对于芯片PF来说,随着壁面过热度的增加,热流量呈剧烈的增加趋势且临界热流密度时芯片的表面温度低于芯片回路正常工作的临界上限温度85℃,最大临界热流密度可达80 W／cm2。

关键词：电子器件冷却微结构强化沸腾换热

在线全文

学校读者我要写书评

暂无评论

自然循环回路内芯片的强化沸腾换热研究

工程热物理学报 2007年第Z1期28卷 225-228页

作者：魏进家权晓波本田博司西安交通大学动力工程多相流国家重点实验室陕西西安710049 北京宇航系统工程研究所北京100076 九州大学日本福冈8168580

针对电子器件的高效冷却问题,对自然循环回路系统内表面加工有方柱形微结构的硅片上FC-72的强化沸腾换热性能进行了实验研究。测试了两个芯片,其表面上的方柱形微结构的边长均为30μm,但高度分别为60μm和200μm。沸腾介质的过冷度设为1... 详细信息

针对电子器件的高效冷却问题,对自然循环回路系统内表面加工有方柱形微结构的硅片上FC-72的强化沸腾换热性能进行了实验研究。测试了两个芯片,其表面上的方柱形微结构的边长均为30μm,但高度分别为60μm和200μm。沸腾介质的过冷度设为10 K、25 K和35 K。随着壁面过热度的增加,微结构表面芯片上的热流密度急剧增加且临界热流密度时芯片的表面温度低于芯片回路正常工作的临界上限温度85℃,这与其在池沸腾换热中的特点一样。但临界热流密度值与池沸腾情况相比有所降低。

关键词：芯片冷却方柱形微结构强化沸腾换热自然循环