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

低排放柴油机燃烧的新概念

汽车与新动力 1998年第3期 3-11页

作者： Haruyuki Yokota yugo Kudo Hiroshi Naka jima 杨寿藏

为了降低柴油机NOx和颗粒排放,用数值模拟发动机试验和观察燃烧过程方法研究了柴油机燃烧的一种新概念。该概念（HiMICS:均质合理的多次喷射燃烧系统）为预混合压缩着火燃烧与多次喷射相结合的方式。用与标准的单次喷射和先导喷射的比... 详细信息

为了降低柴油机NOx和颗粒排放,用数值模拟发动机试验和观察燃烧过程方法研究了柴油机燃烧的一种新概念。该概念（HiMICS:均质合理的多次喷射燃烧系统）为预混合压缩着火燃烧与多次喷射相结合的方式。用与标准的单次喷射和先导喷射的比较方法研究了HiMICS方式的燃烧特性。HiMICS方式要求在从进气行程早期到压缩行程中期这一时期内完成预先喷油形成预混合气。采用改进的KIVA-Ⅱ程序分析了每一种喷油模式对发动机性能和排放量的影响。模拟结果表明,HiMICS燃烧系统的燃油耗与NOx排放量之间的折衷关系可获得显著的改进。为了证实模拟计算的结论,在一台装有共轨喷油系统的单缸试验机上完成了发动机试验。与模拟计算结论相反,试验表明,在正常喷油定时范围内,与标准喷油系统或先导喷油系统比较,HiMICS燃烧系统的NOx和燃油耗之间以及NOx和炭烟排放之间的折衷关系更为恶化。然而,从另一方面来说,当喷油定时相当大地推迟时,HiMICS燃烧系统在燃油耗和炭烟排放方面占优势,同时NOx排放也相当低。需进一步解决的问题:预混合不够均匀,预混合气着火过早以及HC和CO排放量偏高。

关键词：燃烧概念排放柴油机研究

Vaginal Carriage of Group B Streptococcus in Pregnant Women in Rural Areas in Senegal

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Open Journal of Medical Microbiology 2023年第3期13卷 207-219页

作者： Babacar Ndiaye Fatoumata Diene Sarr Mam Coumba Diouf Rokhaya Diop Hamidou Thiam Mohamed Abass yugo Rose Mbaye Amadou Alpha Sall Cheikh Loucoubar Abdoulaye Seck Medical Biology Laboratory Pasteur Institute of Dakar Dakar Senegal Epidemiology Clinical Research and Data Science Unit Pasteur Institute of Dakar Dakar Senegal Virology Unit Pasteur Institute of Dakar Dakar Senegal

Vaginal carriage of Group B Streptococcus (GBS) is a maternal and child health issue. Our objective was to determine the prevalence of GBS carriage;identify the factors associated with this carriage and determine the antibiotic sensitivity of the isolated strains. We conducted a cross-sectional and prospective study in rural Senegal (in the health district of Sokone). Socio-demographic, clinical and gynaeco-obstetrical data were collected. Vaginal swabs were taken by the midwives on specific settings in order to test for GBS and other High Risk Vaginal Bacteria (HRVB). Antibiotic susceptibility testing was done according to the recommendations of the CA SFM/EUCAST 2020. In total, 100 pregnant women were targeted and 97 pregnant women were included. Their age ranged from 18 to 40 years with 64.9% (63/97) of participants belonging to the “20 - 30” age group. The overall prevalence of Group B Streptococcus carriage was 15.5% (15/97). However, the proportion of women with at least one high risk infectious bacteria was 29.89% (29/97). No statistically significant differences were found between GBS carriage and the potential factors studied. However, the study also looked for the presence of other high-risk bacteria and coinfections were indeed found between GBS and E. coli and Staphylococcus aureus. Antibiotic susceptibility testing shows that GBS strains were fully susceptible to penicillin G, erythromycin, clindamycin, chloramphenicol, rifampicin and vancomycin. Sensitivities to norfloxacin and gentamycin were 73.3% and 86.7% respectively. In contrast, high resistance to tetracycline (86.7%) was observed. GBS carriage remains a major public health issue because of its consequences for the mother and the newborn. Correct screening and proper monitoring of strain susceptibility remain one of the most effective means of patient management and care.

关键词： Group B Streptococcus (Streptococcus agalactiae) Vaginal Carriage Antibiotic Susceptibility Senegal

运用方阵样地进行森林资源清查的基本原理与有关问题

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

林业科学 1989年第3期25卷 276-281页

作者：梅山姜孟霞李裕国黑龙江省森林资源调查管理局

黑龙江省森林资源管理局根据瑞典林学家哈格伦德教授的建议,于1984年在通河、山河屯两林业局建立了132个方阵样地与原有森林连续清查的系统抽样(相隔8×8km)设计进行对比(见图1)。试验数据在VAX小型机上进行了处理。结果表明,方阵无论... 详细信息

黑龙江省森林资源管理局根据瑞典林学家哈格伦德教授的建议,于1984年在通河、山河屯两林业局建立了132个方阵样地与原有森林连续清查的系统抽样(相隔8×8km)设计进行对比(见图1)。试验数据在VAX小型机上进行了处理。结果表明,方阵无论从蓄积、面积估计,还是时间效率都较原方案好得多。因此1986年及以后的省级森林连续清查体系中,我们设计了部分重复替换系统群团抽样新方案。

关键词：方阵森林资源调查替换抽样

Recent Advances in Japanese Fisheries Science in the Kuroshio-Oyashio Region through Development of the FRA-ROMS Ocean Forecast System: Overview of the Reproducibility of Reanalysis Products

在线全文

学校读者我要写书评

暂无评论

Open Journal of Marine Science 2017年第1期7卷 62-90页

作者： Hiroshi Kuroda Takashi Setou Shigeho Kakehi Shin-ichi Ito Takeshi Taneda Tomonori Azumaya Denzo Inagake Yutaka Hiroe Kenji Morinaga Makoto Okazaki Takashi Yokota Takeshi Okunishi Kazuhiro Aoki yugo Shimizu Daisuke Hasegawa Tomowo Watanabe Hokkaido National Fisheries Research Institute Japan Fisheries Research and Education Agency Kushiro Japan National Research Institute of Fisheries Science Japan Fisheries Research and Education Agency Yokohama Japan Tohoku National Fisheries Research Institute Japan Fisheries Research and Education Agency Shiogama Japan Atmosphere and Ocean Research Institute University of Tokyo Kashiwa Japan Seikai National Fisheries Research Institute Japan Fisheries Research and Education Agency Nagasaki Japan National Research Institute of Far Seas Fisheries Japan Fisheries Research and Education Agency Yokohama Japan Hokkaido National Fisheries Research Institute Japan Fisheries Research and Education Agency Akkeshi Japan Headquaters Japan Fisheries Research and Education Agency Yokohama Japan

To address various fisheries science problems around Japan, the Japan Fisheries Research and Education Agency (FRA) has developed an ocean forecast system by combining an ocean circulation model based on the Regional Ocean Modeling System (ROMS) with three-dimensional variational analysis schemes. This system, which is called FRA-ROMS, is a basic and essential tool for the systematic conduct of fisheries science. The main aim of FRA-ROMS is to realistically simulate mesoscale variations over the Kuroshio-Oyashio region. Here, in situ oceanographic and satellite data were assimilated into FRA-ROMS using a weekly time window. We first examined the reproducibility through comparison with several oceanographic datasets with an Eulerian reference frame. FRA-ROMS was able to reproduce representative features of mesoscale variations such as the position of the Kuroshio path, variability of the Kuroshio Extension, and southward intrusions of the Oyashio. Second, using a Lagrangian reference frame, we estimated position errors between ocean drifters and particles passively transported by simulated currents, because particle tracking is an essential technique used in applications of reanalysis products to fisheries science. Finally, we summarize recent and ongoing fisheries studies that use FRA-ROMS and mention several new developments and enhancements that will be implemented in the near future.

关键词： ROMS 3D-Var Objective Analysis Reanalysis Data Fisheries Science Particle-Tracking Experiment

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

碳材料吸附脱除二氧化硫性能的影响因素

化工进展 2022年第9期41卷 4963-4972页

作者：李兴黄宏宇大坂侑吾呼和涛力肖林发李军南京工业大学机械与动力工程学院江苏南京211816 中国科学院广州能源研究所广东广州510640 南方海洋科学与工程广东省实验室(广州) 广东广州511458 日本金泽大学金泽9201192 常州大学城乡矿山研究院江苏常州213164

选用了7种不同物理化学特性的碳材料,分别为活性炭-1(比表面积1779m^(2)/g)、活性炭-2(比表面积970m^(2)/g)、多孔纳米炭-1(平均孔径14nm)、多孔纳米炭-2(平均孔径85nm)、多孔纳米炭-3(平均孔径4.7nm,掺氮)、多孔纳米炭-4(平均孔径4.1nm... 详细信息

选用了7种不同物理化学特性的碳材料,分别为活性炭-1(比表面积1779m^(2)/g)、活性炭-2(比表面积970m^(2)/g)、多孔纳米炭-1(平均孔径14nm)、多孔纳米炭-2(平均孔径85nm)、多孔纳米炭-3(平均孔径4.7nm,掺氮)、多孔纳米炭-4(平均孔径4.1nm,不掺氮)和纳米碳纤维。在对比这7种不同的碳材料的物理化学特性与其脱硫性能的基础上,研究材料的物理化学特性、脱硫温度、反应空速等因素对碳材料吸附脱除SO_(2)性能的影响。结果表明,碳材料吸附脱除SO_(2)的性能受材料的比表面积、孔隙结构、表面官能团、脱硫温度和反应空速的综合影响。不同的碳材料中,材料的孔隙结构和表面官能团对材料的脱硫性能影响很大,以微孔结构为主的碳材料SO_(2)去除率较高,以介孔结构为主的碳材料脱硫容量较高;随着脱硫温度升高,碳材料的吸附脱硫性能降低;随着反应空速降低,碳材料的吸附脱硫性能升高。本研究中,多孔纳米炭NCP-10的吸附脱除SO_(2)性能最好,能在室温下保持100%的SO_(2)去除率持续1h,且在室温下1h内累积的脱硫容量最高可达108mg(SO_(2))/g(材料)。

关键词：环境碳材料吸附剂二氧化硫脱除固定床脱硫性能

Evolving concepts in bone infection: redefining “biofilm”,“acute vs. chronic osteomyelitis”, “the immune proteome” and “local antibiotic therapy”

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

Bone Research 2019年第3期7卷 225-242页

作者： Elysia A. Masters Ryan P. Trombetta Karen L. de Mesy Bentley Brendan F Boyce Ann Lindley Gill Steven R. Gill Kohei Nishitani Masahiro Ishikawa yugo Morita Hiromu Ito Sheila N. Bello-Irizarry Mark Ninomiya James D. Brodell Jr. Charles C. Lee Stephanie P. Hao Irvin Oh Chao Xie Hani A. Awad John L. Daiss John R. Owen Stephen L. Kates Edward M. Schwarz Gowrishankar Muthukrishnan Center for Musculoskeletal Research University of Rochester Medical Center Rochester NY USA Department of Biomedical Engineering University of Rochester Medical Center Rochester NY USA Department of Pathology and Laboratory Medicine University of Rochester Medical Center Rochester NY USA Department of Orthopaedics University of Rochester Medical Center Rochester NY USA Department of Microbiology & Immunology University of Rochester Medical Center Rochester NY USA Department of Orthopaedic Surgery Kyoto University Kyoto Japan Department of Orthopaedic Surgery Virginia Commonwealth University Medical Center Richmond VA USA

Osteomyelitis is a devastating disease caused by microbial infection of bone. While the frequency of infection following elective orthopedic surgery is low, rates of reinfection are disturbingly high. Staphylococcus aureus is responsible for the majority of chronic osteomyelitis cases and is often considered to be incurable due to bacterial persistence deep within bone. Unfortunately, there is no consensus on clinical classifications of osteomyelitis and the ensuing treatment algorithm. Given the high patient morbidity,mortality, and economic burden caused by osteomyelitis, it is important to elucidate mechanisms of bone infection to inform novel strategies for prevention and curative treatment. Recent discoveries in this field have identified three distinct reservoirs of bacterial biofilm including: Staphylococcal abscess communities in the local soft tissue and bone marrow, glycocalyx formation on implant hardware and necrotic tissue, and colonization of the osteocyte-lacuno canalicular network(OLCN) of cortical bone. In contrast, *** intracellular persistence in bone cells has not been substantiated in vivo, which challenges this mode of chronic osteomyelitis. There have also been major advances in our understanding of the immune proteome against S. aureus, from clinical studies of serum antibodies and media enriched for newly synthesized antibodies(MENSA), which may provide new opportunities for osteomyelitis diagnosis, prognosis, and vaccine development. Finally, novel therapies such as antimicrobial implant coatings and antibiotic impregnated 3D-printed scaffolds represent promising strategies for preventing and managing this devastating disease. Here, we review these recent advances and highlight translational opportunities towards a cure.

关键词： disease caused by soft tissue necrotic tissuel

MnO_2/NaY复合材料的制备及其对SO_2脱除性能

在线全文

学校读者我要写书评

暂无评论

化工进展 2019年第5期38卷 2284-2292页

作者：陈林涛大坂侑吾刘学成何兆红李兴黄宏宇中国科学院广州能源研究所广东广州510640 中国科学院大学北京100049 中国科学院可再生能源重点实验室广东广州510640 广东省新能源和可再生能源研究开发与应用重点实验室广东广州510640 日本金泽大学日本金泽9201192 重庆工商大学重庆400000

以NaY分子筛为载体,MnO_2为活性组分,采用沉淀法制备MnO_2/NaY复合脱硫材料;通过X射线衍射(XRD)、扫描电子显微镜(SEM)、氮气吸附脱附法(N2-吸附脱附)、X射线光电子能谱(XPS)、热重分析(TG)等手段进行材料的物理化学结构表征;使用容量... 详细信息

以NaY分子筛为载体,MnO_2为活性组分,采用沉淀法制备MnO_2/NaY复合脱硫材料;通过X射线衍射(XRD)、扫描电子显微镜(SEM)、氮气吸附脱附法(N2-吸附脱附)、X射线光电子能谱(XPS)、热重分析(TG)等手段进行材料的物理化学结构表征;使用容量法装置测试复合材料的脱硫性能;考察MnO_2不同负载量及不同反应温度对MnO_2/NaY复合材料脱硫性能的影响。结果表明:MnO_2/NaY复合材料的孔容越大,其脱硫性能越好;多孔珊瑚状MnO_2脱硫性能优于棒状MnO_2;随着MnO_2负载量及反应温度的增加,MnO_2/NaY的脱硫性能先增加后降低,MnO_2/NaY-41%在400℃时的脱硫性能最好,第1h脱硫量达到114.56mgSO_2/g材料;500℃时复合材料脱硫性能下降,是由于脱硫反应过程中MnO_2分解生成Mn_3O_4;MnO_2/NaY比纯MnO_2拥有更好的脱硫性能,反应温度为300℃和400℃时,MnO_2/NaY-41%较纯MnO_2的第1h脱硫量分别提高28.3%和56.1%。MnO_2/NaY-41%复合材料在中低温下的高效脱硫性能有望应用于船舶尾气的深度脱硫。

关键词：烟道气二氧化硫吸附剂二氧化锰分子筛

在线全文

学校读者我要写书评

暂无评论

低温驱动沸石-水吸附式制冷机的性能研究

制冷学报 2016年第1期37卷 65-69页

作者：王南南刘再冲邓立生何兆红窪田光宏大坂侑吾黄宏宇陈颖中国科学院广州能源研究所广州510640 中国科学院大学北京100049 广东工业大学材料与能源学院广州510006 日本名古屋大学名古屋4648603 日本金泽大学金泽9201192

本文研究的合成沸石-水吸附式制冷机采用FAMZ01沸石作为吸附剂,吸附床选择翅片涂抹式吸附床,通过实验研究该制冷机的制冷功率、制冷性能系数(COP)随热源温度、冷冻水进口温度的变化规律。结果表明,该吸附式制冷机在55℃的热源下就可以... 详细信息

本文研究的合成沸石-水吸附式制冷机采用FAMZ01沸石作为吸附剂,吸附床选择翅片涂抹式吸附床,通过实验研究该制冷机的制冷功率、制冷性能系数(COP)随热源温度、冷冻水进口温度的变化规律。结果表明,该吸附式制冷机在55℃的热源下就可以稳定输出制冷量,并在驱动热源为65℃左右展现其较佳的性能。

关键词：吸附式制冷机涂抹式吸附床 COP 热源温度

在线全文

学校读者我要写书评

暂无评论

热化学蓄热系统研究进展

新能源进展 2015年第4期3卷 289-298页

作者：王智辉漥田光宏杨希贤刘学成何兆红大坂侑吾黄宏宇中国科学院广州能源研究所日本名古屋大学日本金泽大学

热化学蓄热通过可逆化学反应来储存和释放热量,其蓄热密度高于显热蓄热和相变蓄热,且能够实现能量的长期储存,在未来能源利用领域具有广阔前景。根据热化学蓄热系统的结构,可将其分为开式系统和闭式系统。本文针对开式系统和闭式系统,... 详细信息

热化学蓄热通过可逆化学反应来储存和释放热量,其蓄热密度高于显热蓄热和相变蓄热,且能够实现能量的长期储存,在未来能源利用领域具有广阔前景。根据热化学蓄热系统的结构,可将其分为开式系统和闭式系统。本文针对开式系统和闭式系统,对蓄热材料、环境气氛条件、反应过程优化以及反应器设计等影响系统性能的重要因素进行概述与讨论,为热化学蓄热系统的发展和实际应用提供参考。

关键词：热化学蓄热开式系统闭式系统系统性能