检索结果-南通市图书馆

在线全文

学校读者我要写书评

暂无评论

蠕变退化对镍基合金钢硬度的影响

水钢科技 2019年第4期 52-61页

作者： Nobuhiko SAITO Kazuki ISHIYAMA Tomiko YAMAGUCHI fujimitsu masuyama 高长益(译) 叶雅妮(译) 张东升(译) 吴学林(译) 刘立德(译) 日本三菱重工株式会社研究与创新中心日本日新钢铁有限公司日本九州工业大学首钢水钢制造管理部贵州六盘水553028

在日本,为了减少CO2排放量和提高发电效率,我们正在研究开发超临界动力锅炉用钢,该钢在700益的超临界温度下服役。镍基合金,UNS N06674(ASME 2826、47Ni-23Cr-23Fe-7W、HR6W)和UNS N06617(52Ni-22Cr-13Co-9Mo、617合金)是用于高温超临... 详细信息

在日本,为了减少CO2排放量和提高发电效率,我们正在研究开发超临界动力锅炉用钢,该钢在700益的超临界温度下服役。镍基合金,UNS N06674(ASME 2826、47Ni-23Cr-23Fe-7W、HR6W)和UNS N06617(52Ni-22Cr-13Co-9Mo、617合金)是用于高温超临界动力锅炉的候选材料。在本研究中,为了评价硬度法在蠕变寿命评估中的应用潜力,我们研究了蠕变退化对两种镍基合金硬度变化的影响。研究结果表明,在蠕变寿命的后期,由于材料的硬化和软化,使得硬度值更加分散。这是因为,随着蠕变变形的增加,位错密度增大,材料发生硬化,另一方面,伴随蠕变空洞的形成,析出物变粗,材料发生软化。这一趋势与蠕变寿命分数有很好的相关性。因此,这为蠕变寿命评估提供了有用的工具。另外,我们发现,HR6W钢的硬度变化可表示为温度、应力和蠕变寿命分数的函数。因此,通过多元分析,建立了硬度的回归方程。把服役温度、服役应力和测量的硬度代入多元回归方程中,能够计算出蠕变寿命分数。这些发现表明,这种硬度方法对于镍基合金钢的蠕变寿命评估是有用的。

关键词：现代超临界动力锅炉镍基合金钢蠕变寿命评估硬度多元分析

A hydrochemical study of the Hammam Righa geothermal waters in north-central Algeria

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Acta Geochimica 2016年第3期35卷 271-287页

作者： Mohamed Belhai Yasuhiro fujimitsu Fatima Zohra Bouchareb-Haouchine Abdelhamid Haouchine Jun Nishijima Department of Earth Resources Engineering GraduateSchool of EngineeringKyushu UniversityFukuoka 819-0395Japan Department of Earth Resources Engineering Faculty ofEngineeringKyushu UniversityFukuoka 819-0395Japan Laboratoire de Geo-Environnement FSTGAT/USTHB BP 32El-Alia16000 AlgiersAlgeria

This study focuses on the hydrochemical characteristics of 47 water samples collected from thermal and cold springs that emerge from the Hammam Righa geothermal field, located in north-central Algeria. The aquifer that feeds these springs is mainly situated in the deeply fractured Jurassic limestone and dolomite of the Zaccar Mount. Measured discharge temperatures of the cold waters range from 16.0 to 26.5 ℃ and the hot waters from 32.1 to 68.2 ℃. All waters exhibited a near-neutral pH of 6.0-7.6. The thermal waters had a high total dis- solved solids （TDS） content of up to 2527 mg/l, while the TDS for cold waters was 659.0-852.0 mg/l. Chemical analyses suggest that two main types of water exist： hot waters in the upflow area of the Ca-Na-SO4 type （Ham- mam Righa） and cold waters in the recharge zone of the Ca-Na-HCO3 type （Zaccar Mount）. Reservoir tempera- tures were estimated using silica geothermometers and fluid/mineral equilibria at 78, 92, and 95℃ for HR4, HR2, and HRI, respectively. Stable isotopic analyses of the δ18O and δD composition of the waters suggest that the thermal waters of Hammam Righa are of meteoric origin. We conclude that meteoric recharge infiltrates through the fractured dolomitic limestones of the Zaccar Mount and is conductively heated at a depth of 2.1-2.2 km. The hotwaters then interact at depth with Triassic evaporites located in the hydrothermal conduit （fault）, giving rise to the Ca-Na-SO4 water type. As they ascend to the surface, the thermal waters mix with shallower Mg-rich ground- water, resulting in waters that plot in the immature water field in the Na-K-Mg diagram. The mixing trend between cold groundwaters from the recharge zone area （Zaccar Mount） and hot waters in the upflow area （Hammam Righa） is apparent via a chloride-enthalpy diagram that shows a mixing ratio of 22.6 〈 R 〈 29.2 %. We summa- rize these results with a geothermal conceptual model of the Hammam Righa geothermal field.

关键词： Thermal waters North-central Algeria Geochemistry Geothermometry Geothermal conceptualmodel Cold groundwaters

Characteristics of In-Hospital Patients with Congenital Heart Disease Requiring Rapid Response System Activations: A Japanese Database Study

在线全文

学校读者我要写书评

暂无评论

Congenital Heart Disease 2022年第1期17卷 31-43页

作者： Taiki Haga Tomoyuki masuyama Yoshiro Hayashi Takahiro Atsumi Kenzo Ishii Shinsuke Fujiwara Department of Pediatric Critical Care Medicine Osaka City General HospitalOsaka534-0021Japan Department of Emergency and Critical Care Medicine Jichi Medical University Saitama Medical CenterSaitama330-8503Japan Department of Intensive Care Medicine Kameda Medical CenterChiba296-8602Japan Department of Emergency Medicine Seirei Hamamatsu General HospitalShizuoka430-8558Japan Department of Anesthesiology Intensive Care UnitFukuyama City HospitalHiroshima721-8511Japan Department of Emergency Medicine NHO Ureshino Medical CenterSaga843-0393Japan

Objectives:This study aimed to study the characteristics of in-hospital deterioration in patients with congenital heart disease who required rapid response system activation and identify risk factors associated with 1-month ***:We retrospectively analysed data from a Japanese rapid response system registry with 35 participating *** included consecutive patients with congenital heart disease who required rapid response system activation between January 2014 and March *** regression analyses were performed to examine the associations between 1-month mortality and other patient-specific ***:Among 9,607 patients for whom the rapid response system was activated,only 82(0.9%)had congenital heart *** few patients with congenital heart disease were being treated at the cardiology and cardiovascular surgery departments(12.3%and 9.9%,respectively).Moreover,the incidences of rapid-response events after intensive care unit discharge or surgery were low(6.8% and 12.2%,respectively).The most common reason for rapid response system activation was respiratory dysfunction(desaturation:35.4%,tachypnoea:25.6%,and new dyspnoea:19.5%).Rapid response system interventions and intensive care unit transfers were required for 65.9% and 20.7%of patients,*** mortality rate was 1.2% at the end of the rapid response system intervention and 11.0% after 1 ***,decreased respiratory rate and decreased heart rate at rapid response system activation were associated with increased 1-month *** adjusted odds ratio was 1.10(95% confidence interval 1.02–1.19)and 1.02(95% confidence interval,1.00–1.04) for respiratory rate and heart rate,***:Rapid response systems were rarely activated after cardiac surgery and intensive care unit discharge,which were situations with a high risk of sudden deterioration in patients with congenital heart ***,encouraging the use of the rapid response sys

关键词： Heart defects congenital emergencies clinical deterioration hospital rapid response team critical care This

Clinical importance of colonoscopy in patients with gastric neoplasm undergoing endoscopic submucosal dissection

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 2017年第23期23卷 4262-4269页

作者： Chieko Tsuchida Naoto Yoshitake Hitoshi Kino Yoshihito Kaneko Masakazu Nakano Kohei Tsuchida Keiichi Tominaga Takako Sasai Hironori masuyama Hidetsugu Yamagishi Yasuo Imai Hideyuki Hiraishi Department of Gastroenterology Dokkyo Medical University Department of Diagnostic Pathology Dokkyo Medical University

To evaluate the usefulness of total colonoscopy (TCS) for patients undergoing gastric endoscopic submucosal dissection (ESD) and to assess risk factors for colorectal *** the 263 patients who underwent ESD at our department between May 2010 and December 2013, 172 patients undergoing TCS during a one-year period before and after ESD were targeted. After excluding patients with a history of surgery or endoscopic therapy for colorectal neoplasms, 158 patients were analyzed. Of the 868 asymptomatic patients who underwent TCS during the same period because of positive fecal immunochemical test (FIT) results, 158 patients with no history of either surgery or endoscopic therapy for colorectal neoplasms who were matched for age and sex served as the control group for *** revealed adenoma less than 10 mm in 53 patients (33.6%), advanced adenoma in 17 (10.8%), early colorectal cancer in 5 (3.2%), and advanced colorectal cancer in 4 (2.5%). When the presence or absence of adenoma less than 10 mm, advanced adenoma, and colorectal cancer and the number of adenomas were compared between patients undergoing ESD and FIT-positive patients, there were no statistically significant differences in any of the parameters assessed. The patients undergoing ESD appeared to have the same risk of colorectal neoplasms as the FIT-positive patients. Colorectal neoplasms were clearly more common in men than in women (P = 0.031). Advanced adenoma and cancer were significantly more frequent in patients with at least two of the following conditions: hypertension, dyslipidemia, and diabetes mellitus (P = 0.019).CONCLUSIONIn patients undergoing gastric ESD, TCS appears to be important for detecting synchronous double neoplasms. Advanced adenoma and cancer were more common in patients with at least two of the following conditions: hypertension, dyslipidemia, and diabetes mellitus. Caution is therefore especially warranted in patients with these risk factors.

关键词： Colonoscopy Colorectal neoplasm Gastric neoplasm Endoscopic submucosal dissection Fecal immunochemical test

Takotsubo cardiomyopathy: Pathophysiology,diagnosis and treatment

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 Cardiology 2014年第7期6卷 602-609页

作者： Kazuo Komamura Miho Fukui Toshihiro Iwasaku Shinichi Hirotani Tohru masuyama Cardiovascular Division Department of Internal MedicineHyogo College of Medicine

In 1990,takotsubo cardiomyopathy(TCM)was first discovered and reported by a Japanese cardiovascular *** then,this heart disease has gained worldwide acceptance as an independent disease *** is an important entity that differs from acute myocardial *** occurs more often in postmenopausal elderly women,is characterized by a transient hypokinesis of the left ventricular(LV)apex,and is associated with emotional or physical *** motion abnormality of the LV apex is generally transient and resolves within a few days to several *** prognosis is generally ***,there are some reports of serious TCM complications,including hypotension,heart failure,ventricular rupture,thrombosis involving the LV apex,and torsade de *** has been suggested that coronary spasm,coronary microvascular dysfunction,catecholamine toxicity and myocarditis might contribute to the pathogenesis of ***,its pathophysiology is not clearly understood.

关键词： Cardiomyopathy Catecholamine Heart failure Myocardial Infarction Stress

Different Fetal and Neonatal Growth between Early- and Late-Onset Preeclampsia

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2015年第9期5卷 516-521页

作者： Takashi Mitsui Hisashi masuyama Eriko Eto Etsuko Nobumoto Kei Hayata Yuji Hiramatsu Department of Obstetrics and Gynecology Okayama University Graduate School of Medicine Dentistry and Pharmaceutical Sciences Okayama Japan

Preeclampsia is a heterogeneous disease, and there are major differences in severity, fetal growth and poor placentation between early- and late-onset preeclampsia. Here, we examined the effect of onset period on fetal and neonatal growth in preeclampsia with a cross-sectional study including 102 pregnant women with preeclampsia visited Okayama University Hospital from 2009 to 2013. The subjects were retrospectively compared in terms of body mass index (BMI), weight gain during pregnancy, complications, weeks of delivery, neonatal body weight and BMI at birth, fetal growth restriction (FGR), small for gestational age (SGA), pathological findings in the placenta, and infant’s weight at 1 month after birth. Neonatal body weight and BMI at birth were significantly lower and the extent of FGR and the frequency of SGA were higher in early-onset group compared with late-onset group. Mean daily weight gain during the neonatal period was significantly lower in the early-onset group compared with the late-onset group, however the weight gain rate during the neonatal period in the early-onset group was higher than that in late-onset group. In conclusions, there are significant differences in fetal and neonatal growth between early- and late-onset preeclampsia and the catch up for growth might start during neonatal period.

关键词： Body Mass Index Fetal Growth Restriction Onset Period Preeclampsia

Conservative management of cervical pregnancy: The utility of methotrexate treatment and uterine artery embolization

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Obstetrics and Gynecology 2013年第10期3卷 711-716页

作者： Hisashi masuyama Seiji Inoue Etsuko Nobumoto Kei Hayata Tomonori Segawa Yuji Hiramatsu Department of Obstetrics and Gynecology Okayama University Graduate School of Medicine Dentistry and Pharmaceutical Science Okayama Japan

The aim of this retrospective case series report is to evaluate systemic methotrexate therapy in conjunction with uterine artery embolization (UAE) in the conservative management of cervical pregnancy. We examined clinical presentations, treatments, and therapeutic outcomes in fifteen patients with a cervical pregnancy who wished for preservation of fertility, treated at Okayama University Hospital between 1998 and 2012. Twelve patients received systemic methotrexate including five treated with UAE. One was treated with UAE alone. Two patients received neither UAE nor methotrexate because of a low human chorionic gonadotropin (hCG) level and poor blood flow around the gestational sac (GS). An increased GS size and the elevated hCG level during methotrexate therapy might be risk factors for emergent UAE. Two of six patients treated with UAE had subsequent confirmed viable pregnancies. In patients with a cervical pregnancy, methotrexate therapy in combination with UAE can be considered as an option before performing a hysterectomy with suitable counseling about the risk of loss of fertility. Careful observation of the GS size and hCG level during methotrexate therapy might be important for management.

关键词： Cervical Pregnancy Methotrexate Uterine Artery Embolization Dilatation and Curettage Human Chorionic Gonadotropin

经胸与开胸背向散射积分测量的比较——经胸心肌超声组织定征的验证

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

上海生物医学工程 1997年第3期18卷 30-33页

作者： Naito J masuyama T Mano T 王志刚

为研究是否能经胸壁进行心肌背向散射的测量,用新近开发的与血液散射相关的背向散射积分(IB)影像系统,对5例成年杂狗的心肌参数进行了测量。以了解用2.5或3.5MHz频率探头,于心室间隔或心室后壁在开胸和经胸时的IB定标测值有否显著性差... 详细信息

为研究是否能经胸壁进行心肌背向散射的测量,用新近开发的与血液散射相关的背向散射积分(IB)影像系统,对5例成年杂狗的心肌参数进行了测量。以了解用2.5或3.5MHz频率探头,于心室间隔或心室后壁在开胸和经胸时的IB定标测值有否显著性差异。实验结果发现,不论探头频率不同或在开胸与经胸的条件下,背向散射积分在心动周期中的变异幅度均无显著性差异。这些研究资料提示,经胸壁对IB定征,不仅可以测量IB在心动周期中的变异幅度,而且可以用2.5或3.5MHz的探头对心肌IB定标检测进行精确的测量。这些资料可以验证人体经胸壁对IB参数的检测。

关键词：胸壁心肌疾病背向散射积分超声组织定征

前、后负荷及心肌收缩力对用背向散射积分进行超声组织定征的影响

在线全文

学校读者我要写书评

暂无评论

上海生物医学工程 1997年第3期18卷 38-40,47页

作者： Naito J masuyama T Mano T 王志刚

研究26只杂狗前负荷、后负荷和心肌收缩力等血流动力学变化对心肌背向散射积分(IB)的影响。用血流散射作心肌IB测量的定标,对容量灌注(前负荷改变)期间、主动脉收缩(后负荷改变)期间和多巴酚丁胺胺及普萘洛尔灌注(收缩力改变)期间的心... 详细信息

研究26只杂狗前负荷、后负荷和心肌收缩力等血流动力学变化对心肌背向散射积分(IB)的影响。用血流散射作心肌IB测量的定标,对容量灌注(前负荷改变)期间、主动脉收缩(后负荷改变)期间和多巴酚丁胺胺及普萘洛尔灌注(收缩力改变)期间的心肌IB进行测量。通过在室间隔、心室后壁的检测发现,前、后负荷和心肌收缩力对定标心肌的IB没有显著性影响。前负荷、后负荷的变化对IB的心动周期的变异幅度无显著影响。但多巴酚丁胶产生的IB的周期性变异幅度有显著增加,而普萘洛尔引起的IB的周期性变异幅度显著降低。这些资料显示,定标的心肌IB不受前、后负荷及心肌收缩力的影响,但IB的周期性变异幅度受心肌收缩力的影响。我们用血液散射作心肌IB的定标测量,结合IB的周期性变异幅度,可以精确地估测心肌的静力学(与纤维化、水肿、坏死等组织学改变有关)和动力学(与肌节长度、肌纤维方向等收缩力因素有关)性质。

关键词：心肌疾病背向散射积分超声组织定征收缩