检索结果-南通市图书馆

固体火箭技术 1986年第2期 1-9页

作者： t.a.boardman P.W.Hoekstra 单建胜张德雄

一种水下或面基巡航导弹的先进助推系统已研制成功,并于1981年7月30日通过静态试车。这种助推发动机代号为tU—915。研制的目的是大幅度提高原有的助推发动机性能,并显著降低研制和生产成本。该发动机主要设計特征有:球窝可动喷管,最大... 详细信息

一种水下或面基巡航导弹的先进助推系统已研制成功,并于1981年7月30日通过静态试车。这种助推发动机代号为tU—915。研制的目的是大幅度提高原有的助推发动机性能,并显著降低研制和生产成本。该发动机主要设計特征有:球窝可动喷管,最大预期工作压力为20.68MPa;全气动的喷管作动系统;允许喷管进行全轴摆动的发动机防护后盖。

关键词：推力向量控制系统成本作动系统封头可拆卸财政管理万向喷管可动喷管球窝喷管助推发动机飞航式导弹巡航导弹隔热层绝热层燃气舵

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

False codling moth thaumatotibia leucotreta （Lepidoptera, tortricidae） larvae are chill-susceptible

引用

Insect Science 2012年第3期19卷 315-328页

作者： Leigh boardman tim G. Grout John S. terblanche Department of Conservation Ecology and Entomology Faculty of Agrisciences Stellenbosch University Stellenbosch South Africa Citrus Research International Nelspruit South Africa

this study reports on the low temperature tolerance and cold hardiness of larvae of false codling moth, thaumatotibia leucotreta. We found that larvae have mean critical thermal minima （lower limits of activity） of 6.7℃ which was influenced by feeding status. the effects of low temperature exposure and duration of exposure on larval survival were assessed and showed that the temperature at which 50% of the population survives is -11.5 ± 0.3℃ after 2 h exposure. the supercooling point （SCP, i.e., freezing temperature） was investigated using a range of cooling rates and under different conditions （feeding and hydration status） and using inoculative freezing treatments （in contact with water or orange juice）. the SCP decreased significantly from -15.6℃ to -17.4℃ after larvae were fasted for 24 h. twenty-four hour treatments at either high or low relative humidity （95.9% or 2.4%） also significantly decreased SCP to -17.2℃ and -18.2℃ respectively. Inoculative freezing （by water contact） raised SCP from -15.6℃ to -6.8℃ which could have important implications for post-harvest sterilization. Cooling rates did not affect SCP which suggests that there is limited phenotypic plasticity of SCP during the larval life-stage, at least over the short time-scales investigated here. In conclusion, larvae of t. leucotreta are chill-susceptible and die upon freezing. these results are important in understanding this pest＇s response to temperature variation, understanding pest risk status and improving post-harvest sterilization efficacy

关键词： behavior chill injury cold hardiness disinfestations extracellular freezing,lethal limits life-stage

来源：

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

头痛的咨询与护理:谁在寻求,谁来给予?

引用

世界核心医学期刊文摘（神经病学分册） 2005年第2期1卷 14-15页

作者： thomas E. boardman H.F. Ogden H. 陈云春王英鹏 Prim. Care Sciences Research Centre Keele UniversityKeele No rth Staffordshire ST5 5BG United Kingdom Dr.

Using data from a cross sectional survey and a prospective record linkage stu dy the aims of this study were to: (i) determine sources of advice and care for headaches in a population survey of adults, and (ii) investigate prospectively t he influences of headaches on general practice consultation in a 12 month follo w up of the responders to the population survey. A population based cross sect ional survey was mailed to 4885 adults (aged ≥18 years) with an adjusted respon se rate of 56%(n = 2662). the main outcome measures of interest were (i) selfre port advice and care seeking in the survey (ii) consultation with general pract itioner for headache and for other conditions in 12 month period subsequent to the survey. Reporting a recent GP consultation for headache was associated with younger age (mean: 46 vs 48 years), female gender (68%vs 60%), and greater hea dache severity as measured by frequency, pain, and associated disability. the commonest sources of advice an d care in the past were GPs (27%), opticians (21%), and pharmacists (8%). Con sultations for headache were not common in the 12 months following the survey ( n = 144); however, those reporting a recent headache were almost 4 times more li kely to consult subsequently with a headache than those not (relative risk; 95% CI: 3.7; 1.9, 7.0). Recent reporting of headache was also associated with an inc reased risk of consulting for mental disorders (1.7; 1.2, 2.6), diseases of the digestive (1.6; 1.1, 2.3) and respiratory system (1.4; 1.1, 1.8), and a decrease d risk of consulting for circulatory diseases (0.8; 0.7, 1.0). Only a minority o f headache sufferers consult their GP, regardless of severity, with opticians an d pharmacists being other important sources of information. Headache appears to have an additional impact upon GP workload through increased rates of consultati ons for nonheadache conditions amongst headache sufferers. the interesting findi ngs regarding rates of consultation for digestive

关键词：全科医师反馈率横断面调查最近因前瞻性调查消化系统疾病精神疾患循环系统疾病呼吸系统疾病随访调查

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：