检索结果-南通市图书馆

Effects of bottom bracings on torsional dynamic characteristics of horizontally curved twin I-girder bridges with different curvatures

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Earthquake Engineering and Engineering Vibration 2012年第2期11卷 149-162页

作者： Robiul Awall Toshiro Hayashikawa Takashi matsumoto Graduate School of Engineering Hokkaido University Faculty of Engineering Hokkaido University

Curved twin I-girder bridges (CTIGBs) have low torsional stiffness that makes them vulnerable to dynamic loads. This study investigates the effects of bottom bracings on the torsional dynamic characteristics of CTIGBs. Five types of bottom bracings are designed to investigate their effects on the dynamic characteristics of CTIGBs with different curvatures under free and forced vibrations. To perform numerical investigations, three-dimensional (3-D) finite element (FE) bridge and vehicle models are established using commercial ANSYS code, and then a vehicle-bridge interaction analysis approach is proposed. Road roughness profiles generated from power spectral density and cross spectral functions are also taken into account in the analyses. The numerical results show that torsional frequencies increase significantly after providing bottom bracings, and the increasing rate depends on the type of bottom bracings and their locations of installation. Bottom bracings can act as load transmitting members from one main girder to the others. Large negative bearing forces that have occurred in bridges with small radii of curvatures can be remarkably reduced by providing bottom bracing systems. It is found that the performances of several bottom bracing systems are effective in improving the torsional dynamic characteristics of the bridges in this study.

关键词： bottom bracing CTIGB FE model torsional stiffness dynamic response negative bearing force

Urban climate in the Tokyo metropolitan area in Japan

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Sciences 2017年第9期29卷 54-62页

作者： Jun matsumoto Fumiaki Fujibe Hideo Takahashi Research Center for Climatology Department of Geography Tokyo Metropolitan University Department of Coupled Ocean-Atmosphere-Land Processes Research JAMSTEC

Long-term climate changes related with urbanization in Tokyo, Japan, and recent temperature and heavy rainfall distribution in the Tokyo metropolitan area are reviewed. A relatively high temperature increase in annual mean temperature at the rate of 3.0°C/century was detected in Tokyo for the period 1901–2015. Some observational evidence showed the existence of both thermal and mechanical effects of urbanization on recent heavy rainfall occurrences, and modeling studies also support precipitation enhancement. Urban influences were recognized in other climatological elements, such as number of fog days, relative humidity, and wind circulation.

关键词： Heat island Cool island Heavy rainfall Fog Humidity Sea breeze

IMPROVEMENT OF BUBBLE MODEL FOR CAVITATING FLOW SIMULATIONS

在线全文

学校读者我要写书评

暂无评论

Journal of Hydrodynamics 2009年第1期21卷 41-46页

作者： TAMURA Y. matsumoto Y. Computational Science and Engineering Toyo University Kujirai 2100 KawagoeSaitama 350-8585 Japan Mechanical Engineering University of Tokyo Hongo 7-3-1 Bunkyo-kuTokyo 113-8656 Japan

In the present research, a bubble dynamics based model for cavitating flow simulations is extended to higher void fraction region for wider range of applications. The present bubble model is based on the so-called Rayleigh-Plesset equation that calculates a temporal bubble radius with the surrounding liquid pressure and is considered to be valid in an area below a certain void fraction. The solution algorithm is modified so that the Rayleigh-Plesset equation is no more solved once the bubble radius （or void fraction） reaches at a certain value till the liquid pressure recovers above the vapor pressure in order to overcome this problem. This procedure is expected to stabilize the numerical calculation. The results of simple two-dimensional flow field are presented compared with the existing bubble model.

关键词： cavitation model Computational Fluid Dynamics (CFD) cavitation flow Rayleigh-Plesset equation

Noninvasive Fetal Lung Maturity Prediction Based on Amniotic Fluid Turbidity Using Ultrasonic Histogram Measurement Function

在线全文

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2023年第1期13卷 26-36页

作者： Kensuke matsumoto Kaoru Yamawaki Kazufumi Haino koji Nishijima Department of Obstetrics and Gynecology Niigata University Medical and Dental Hospital Niigata Japan

Background: Amniotic fluid turbidity increases with fetal lung maturation due to vernix and lung surfactant micelles suspended in the amniotic fluid. This study focused on this phenomenon and evaluated the presence or absence of respiratory distress syndrome (RDS)/transient tachypnea of the newborn (TTN) by quantitatively assessing the brightness of the amniotic fluid turbidity using a noninvasive ultrasound histogram measurement function. Methods: We included cases of singleton pregnancies managed at the Niigata University Medical and Dental Hospital between November 2020 and March 2022. Histograms of amniotic fluid turbidity were measured at the center of the amniotic fluid depth, avoiding the fetus, placenta, and umbilical cord, with the gain setting set to 0, and the average value was obtained after three measurements. Histograms of fetal urine in the bladder were measured similarly. The value obtained by subtracting the fetal bladder brightness value from the amniotic brightness value based on histogram measurements was used as the final amniotic fluid brightness value. Results: We included 118 cases (16 of RDS/TTN and 102 of control). The gestational age of delivery weeks was correlated with amniotic fluid brightness (Spearman’s rank correlation coefficient was 0.344;p = 0.00014). Amniotic fluid brightness values were significantly lower in the RDS/TTN group than in the control group (RDS/TTN: 16.2 ± 13.5, control: 26.3 ± 16.3;p = 0.020). The optimal cutoff value of amniotic fluid brightness to predict RDS/TTN was 20.3. For predicting RDS/TTN, the sensitivity, specificity, positive predictive value, and negative predictive value were 91.7%, 69.6%, 26.2%, and 94.1%, respectively. Conclusions: The quantitative value of the amniotic fluid brightness by histogram measurements may provide an easy and objective index for evaluating the presence or absence of RDS/TTN.

关键词： Amniotic Fluid Brightness Fetal Lung Histogram Turbidity

Tracing founder haplotypes of Japanese apple varieties: application in genomic prediction and genome-wide association study

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Horticulture Research 2021年第1期8卷 614-627页

作者： Mai FMinamikawa Miyuki Kunihisa koji Noshita Shigeki Moriya Kazuyuki Abe Takeshi Hayashi Yuichi Katayose Toshimi matsumoto Chikako Nishitani Shingo Terakami Toshiya Yamamoto Hiroyoshi Iwata Laboratory of Biometry and Bioinformatics Department of Agricultural and Environmental BiologyGraduate School of Agricultural and Life SciencesThe University of Tokyo1-1-1 YayoiBunkyoTokyo 113-8657Japan Institute of Fruit Tree and Tea Science National Agriculture and Food Research Organization(NARO)2-1 FujimotoTsukubaIbaraki 305-8605Japan Division of Apple Research Institute of Fruit Tree and Tea ScienceNARO92-24 Shimokuriyagawa NabeyashikiMoriokaIwate 020-0123Japan Institute of Crop Science NARO2-1-2 KannondaiTsukubaIbaraki 305-8518Japan Institute of Agrobiological Sciences NARO1-2 OwashiTsukubaIbaraki 305-8634Japan

Haplotypes provide useful information for genomics-based approaches,genomic prediction,and genome-wide association *** a small number of superior founders have contributed largely to the breeding history of fruit trees,the information of founder haplotypes may be relevant for performing the genomics-based approaches in these *** this study,we proposed a method to estimate 14 haplotypes from 7 founders and automatically trace the haplotypes forward to apple parental(185 varieties)and breeding(659 F 1 individuals from 16 full-sib families)populations based on 11,786 single-nucleotide polymorphisms,by combining multiple ***,92%of the single-nucleotide polymorphisms information in the parental and breeding populations was characterized by the 14 founder *** use of founder haplotype information improved the accuracy of genomic prediction in 7 traits and the resolution of genome-wide association study in 13 out of 27 fruit quality traits analyzed in this *** also visualized the significant propagation of the founder haplotype with the largest genetic effect in genome-wide association study over the pedigree tree of the parental *** results suggest that the information of founder haplotypes can be useful for not only genetic improvement of fruit quality traits in apples but also for understanding the selection history of founder haplotypes in the breeding program of Japanese apple varieties.

关键词： breeding varieties prediction

Kinetic Studies of Solvent and Pressure Effects on the Thermal Isomerization of Palladium Dithizonate

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2000年第2期16卷 141-145页

作者： Yoshimi Sueishi Kazumi matsumoto Okayama University 日本 Okayama 70 0 -8530

The isomerization of mercury bisdithizonate having tetrahedral stereochemistry occurs in each ligand independently and is unaffected by the presence of the second ligand attached to the same central metal. The effects of solvent and pressure on the thermal isomerization of the square-planar Pd dithizonate complex were studied to determine the influence of ligand on the isomerization rate. The results were compared to those obtained with Hg(HDz)2. The mechanistic implications for the thermal isomerization of Pd(HDz)2 were presented.

关键词： Metal dithizonate Kinetic study Solvent effect Pressure effect

Helicobacter pylori and gastric mucosa-associated lymphoid tissue lymphoma:Recent progress in pathogenesis and management

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2013年第45期19卷 8181-8187页

作者： Shotaro Nakamura Takayuki matsumoto Department of R/D for Surgical Support System Center for Advanced Medical Innovation Kyushu University Fukuoka 812-8582 Japan Department of Medicine and Clinical Science Graduate School of Medical Sciences Kyushu UniversityFukuoka 812-8582 Japan Division of Gastroenterology Department of Internal Medicine Iwate Medical University Morioka 020-8505 Japan

Recent progress in the research regarding the molecular pathogenesis and management of gastric mucosa-associated lymphoid tissue (MALT) lymphoma is reviewed. In approximately 90% of cases, Helicobacter pylori (H. pylori) infection plays the causative role in the pathogenesis, and H. pylori eradication is nowadays the first-line treatment for this disease, which leads to complete disease remission in 50%-90% of cases. In H. pylori-dependent cases, microbe-generated immune responses, including interaction between B and T cells involving CD40 and CD40L co-stimulatory molecules, are considered to induce the development of MALT lymphoma. In H. pylori-independent cases, activation of the nuclear factor-κB pathway by oncogenic products of specific chromosomal translocations such as t(11;18)/API2-MALT1, or inactivation of tumor necrosis factor alpha-induced protein 3 (A20) are considered to contribute to the lymphomagenesis. Recently, a large-scale Japanese multicenter study confirmed that the long-term clinical outcome of gastric MALT lymphoma after H. pylori eradication is excellent. Treatment modalities for patients not responding to H. pylori eradication include a “watch and wait” strategy, radiotherapy, chemotherapy, rituximab immunotherapy, and a combination of these. Because of the indolent behavior of MALT lymphoma, second-line treatment should be tailored in consideration of the clinical stage and extent of the disease in each patient.

关键词： Gastric lymphoma, Mucosa-associated lymphoid tissue lymphoma, Helicobacter pylori, Nuclear factor κ B

Combined disturbance-observer-based control and iterative learning control design for pulsed superconducting radio frequency cavities

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nuclear Science and Techniques 2021年第6期32卷 11-22页

作者： Feng Qiu Shinichiro Michizono Toshihiro matsumoto Takako Miura High Energy Accelerator Research Organization 1-1 OhoTsukubaIbaraki 305-0801Japan The Graduate University for Advanced Studies HayamaKanagawa 240-0193Japan Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China

The development of iterative learning control combined with disturbance-observer-based(DOB)control for the digital low-level radio frequency(LLRF)system of the International Linear Collider project is *** objective of this study is to compensate for both repetitive(or predictable)and unpredictable disturbances in a radio frequency system(e.g.,beam loading,Lorentz force detuning,and microphonics).The DOB control approach was verified using the LLRF system at the Superconducting Test Facility(STF)at KEK in the absence of a *** method comprising DOB control combined with an iterative learning control algorithm was then demonstrated in a cavity-simulator-based test bench,where a simulated beam was *** results showed that the performance of the LLRF system was improved,as expected by this combined control *** plan to further generalize this approach to LLRF systems at the STF and the future International Linear Collider project.

关键词： Low-level radio frequency Disturbance observer Iterative learning control

Selection of appropriate endoscopic therapies for duodenal tumors: An open-label study, single-center experience

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2014年第26期20卷 8624-8630页

作者： Satohiro matsumoto Yukio Yoshida Department of Gastroenterology Saitama Medical CenterJichi Medical University

AIM: To determine an appropriate compartmentalization of endoscopic submucosal dissection (ESD) or endoscopic mucosal resection (EMR) for duodenal tumors.

关键词： Duodenal tumor Endoscopic submucosal dissection Endoscopic mucosal resection Cancer Adenoma Neuroendocrine tumor