检索结果-南通市图书馆

American Journal of Plant Sciences 2020年第2期11卷 201-213页

作者： Clyde douglas Boyette Robert e.Hoagland Charles T.Bryson Mark A.Weaver Kenneth C.Stetina USDA-ARS Biological Control of Pests Research UnitStonevilleMSUSA USDA-ARS Crop Production and Systems Research UnitStonevilleMSUSA

A mycelial formulation of the bioherbicidal fungus Myrothecium verrucaria (Alb. & Schwein.) Ditmar: Fr. (MV) was tested alone and in combination with a commercially available glyphosate [N-(phosphonomethyl)glycine] (GLY) product for controlling the invasive vines, redvine [Brunnichia ovata (Walt.) Shinners], and trumpet creeper [Campsis radicans (L.) Seem. ex Bureau] in field experiments conducted near Stoneville, MS. Several application timing regimens were evaluated (Fall, Spring, Fall + Spring, and Spring + Fall). We found that a Fall + Spring application of MV + GLY controlled redvine and trumpet creeper by 95%, 12 days after the second treatment, through a synergistic interaction of the fungus and glyphosate. Disease symptomatology was characterized by rapid necrosis of leaf and stem tissues, with mortality occurring within 72 h. Neither glyphosate alone, nor MV alone, effectively controlled either weed species under any application timing regimen. No visual disease or herbicide damage occurred on glyphosate-resistant soybean plants in the treated test plots. These results suggest that some formulations of glyphosate, mixed with the bioherbicide MV, can effectively control redvine and trumpet creeper, two of the most troublesome weeds in the row crops of the Mississippi Delta region in the mid-southern U.S.

关键词： Bioherbicide Interaction Mycelial Formulation Myrothecium verrucaria Campsis radicans Brunnichia ovata

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

生态旅游:加勒比的未来?

产业与环境 1993年第3期15卷 64-66页

作者： Joy e.douglas 李忠城市与区域规划师

生态旅游正在作为加勒比海国家保护环境与通过吸引生态游客来赚取外汇的一种手段加以提倡。这些国家的政府已经制订了有关旅游与环境的一般政策和有关生态旅游的具体政策。例如多米尼加已制订了一项基于广大公众充分参与的旅游政策,以... 详细信息

生态旅游正在作为加勒比海国家保护环境与通过吸引生态游客来赚取外汇的一种手段加以提倡。这些国家的政府已经制订了有关旅游与环境的一般政策和有关生态旅游的具体政策。例如多米尼加已制订了一项基于广大公众充分参与的旅游政策,以期改善总体生活质量,创造就业机会,赚取外汇,增强和保存文化与自然资源。多米尼加偏爱那些欣赏这个国家原貌的游客,而不喜欢那些想要改变它的游客。由于加勒比海岛屿规模都较小,需要精心的旅游规划与管理,才能保证资源不被破坏,也才能保证（生态）旅游对当地居民产生积极的社会—经济影响。

关键词：生态旅游环境保护加勒比海地区

维普期刊数据库

国际机械振动与冲击标准社会作用的变化(下)

在线全文

学校读者我要写书评

暂无评论

中国设备工程 2002年第2期 51-53页

作者： B.e.douglas ,李敏

四、标准化中的技术覆盖--一个案例:机械的状态监测一项'良好的'技术标准,它的重要特征之一是具有宽广的应用覆盖面.但是,标准的适用范围愈广,它和其它技术委员会所制定的标准之间出现彼此覆盖的几率就愈大.

关键词：机械振动 TC ISO 名词术语工作组状态监测国际标准化组织

effects of Myrothecium verrucariaon Ultrastructural Integrity of Kudzu (Pueraria montana var. lobata) and Phytotoxin Implications

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

American Journal of Plant Sciences 2012年第11期3卷 1513-1519页

作者： Robert e. Hoagland C. douglas Boyette Kevin C. Vaughn Neal D. Teaster Ken Stetina United States Department of Agriculture-Agricultural Research Service (USDA-ARS) Crop Production Systems Research Unit Stoneville USA USDA-ARS Biological Control of Pests Research Unit Stoneville USA.

The fungus Myrothecium verrucaria (Alb. & Schwein.) (MV), originally isolated from diseased sicklepod (Senna obtusifolia L.), has bioherbicial activity against kudzu and several other weeds when applied with low concentrations of the surfactant Silwet L-77. To more fully understand the initial events of MV infection or disease progression, and to improve knowledge related to its mechanism of action, the effects of MV and its product (roridin A) on kudzu seedlings were examined at the ultrastructural level. Ultrastructural analysis of MV effects on kudzu seedlings revealed a rapid (~1 h after treatment) detachment of the protoplast from the cell wall and plasmodesmata appeared to be broken off and retained in the wall. These symptoms occurred well in advance of the appearance of any fungal growth structures. Some fungal growth was observed after severe tissue degeneration (24 to 48 h after treatment), but this occurred primarily at the extra-cellular location with respect to the kudzu tissues. Kudzu seedlings treated with roridin A, a trichothecene produced by the fungus, exhibited some symptoms similar to those induced by the fungus applied in spore formulations with surfactant. The overall results are the first to report the ultrastructural effects of this bioherbicide on plants and suggest that penetration of a phytotoxic substance(s) in the fungal formulation was facilitated by the surfactant, and that roridin A exerts phytotoxicity toward kudzu.

关键词： Bioherbicide Biological Weed Control Kudzu Myrothecium verrucaria Ultrastructure Trichothecene

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

商品种子工业在农业发展中的关键作用

种子 1986年第2期 62-63页

作者： J·e·douglas,蔡士宾国际热带农业中心种子室主任

种子不只是农民种植的东西,它还带有促进农业发展的潜力。今天,种子工作者和技术人员肩负的担子比历史上任何时候都要重。对作物的精深研究是商品种子工业的基础公有和私有组织的作物研究计划都在培育

关键词：商品种子企业企业管理种子工业农业

国际机械振动与冲击标准社会作用的变化(上)

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

中国设备工程 2002年第1期 49-51页

作者： B.e.douglas 李敏美

随着先进技术日益深入地渗透到对全世界许多人的日常生活至关重要的各个系统中,为了更好地保证实际业务得以公平合理地进行、保护公共安全和保护环境,对高质量技术标准的需要已变得愈来愈迫切。本文涉及机械振动与冲击领域中技术标准化... 详细信息

随着先进技术日益深入地渗透到对全世界许多人的日常生活至关重要的各个系统中,为了更好地保证实际业务得以公平合理地进行、保护公共安全和保护环境,对高质量技术标准的需要已变得愈来愈迫切。本文涉及机械振动与冲击领域中技术标准化的诸多问题,重点为机器和结构的状态监测。文中谈到的具体问题包括:(1)机械振动与冲击领域中标准化的社会目标;(2)各方赞助者的经济利害关系和潜在的冲突方面;(3)ISO/TC108的组织结构、工作过程和业务计划;(4)这些标准广泛应用于机器和结构的状态监测的例子。

关键词：机械振动冲击机器技术标准国

维普期刊数据库

在线全文

学校读者我要写书评

暂无评论

科技型创新区人本化构建的国际实践及启示

地理研究 2018年第4期37卷 834-846页

作者：林静蔡建明 douglas WeBSTeR Larissa MULLeR 中国科学院地理科学与资源研究所北京100101 中国科学院区域可持续发展分析与模拟重点实验室北京100101 中国科学院大学资源与环境学院北京100049 亚利桑那州立大学地理科学与城市规划学院美国坦佩85287 卡尔加里大学环境设计学院加拿大卡尔加里T2N1N4

创新和创新区已日益成为城市经济发展和城市竞争力的重要元素,在科技和人才日渐成为激发城市创新型经济,及促进城市活力的主导甚至决定性因素的当今时代,尤为如此。通过对欧洲、北美和亚洲三个不同类型的科技型创新区国际最佳实践的系... 详细信息

创新和创新区已日益成为城市经济发展和城市竞争力的重要元素,在科技和人才日渐成为激发城市创新型经济,及促进城市活力的主导甚至决定性因素的当今时代,尤为如此。通过对欧洲、北美和亚洲三个不同类型的科技型创新区国际最佳实践的系统梳理,甄别出用以打造一个科技型创新区的共通性要素、标准和原则。国际最佳实践证明,科技型创新区的人本化构建正在成为一种主流趋势,即综合考虑人在各阶段、各层次等多样化需求的基础上,通过对文化要素的有效鉴别和这些要素之间的作用机理,使它们有机融合并系统嵌入到创新区的空间打造中。结论表明:要成功打造一个科技型创新区,必须考虑并重视七大要素,即创意人才、企业集群、能动设施、资金保障、运营管理、空间结构和文化氛围。基于此,提出对中国科技型创新区建设与发展的五大启示,即愿景导向下的持续培育、前瞻性定位、人本化空间布局、创新激发型活动安排和多利益群体参与。最后,还提出要从四个方面进行互动关联研究,以构建空间/地方人本化打造的完整理论体系。

关键词：科技型创新区人本化国际最佳实践地方构建启示理论机制

维普期刊数据库

Health Professionals’ Attitudes towards electronic Psychosocial Assessments in Youth Mental Healthcare

在线全文

学校读者我要写书评

暂无评论

Health 2014年第14期6卷 1822-1833页

作者： Sally Bradford Debra Rickwood douglas Boer Faculty of Health University of Canberra Canberra Australia

Psychosocial assessments can help mental health professionals establish good therapeutic relationships while simultaneously conducting holistic assessments of their young clients. Using technology to conduct assessments may increase disclosure by young people;however, the uptake of new technologies into current face-to-face practice has been slow. In the current study, we were interested in exploring the attitudes of mental health workers to using an electronic psychosocial assessment tool (e-tool) within face-to-face service delivery with adolescents and young adults. An exploratory design was used to identify and qualitatively describe the views of 46 mental health workers from services across the ACT and Victoria, Australia. Data were coded using an inductive thematic approach. Comments indicated that mental health workers held both positive and negative views about the e-tool. Some participants believed that it would allow disclosure to occur in a stepped process, normalize questions, give youth greater input, and be time efficient. However, the majority believed that the e-tool would infringe on their work because they needed to respond to their clients immediately, it would not provide an accurate representation of the client, young people did not have the necessary capabilities to engage in the process, they would miss non-verbal cues from the young person, and they were more likely to gain information from organic conversations. The results suggest that many mental health professionals may be fearful of incorporating new technologies in current practice. Specific training and supportive implementation guidelines must be developed to support use of these new technologies and change practice.

关键词： Psychosocial Assessments Young People Information Communication Technologies Mental Healthcare

Cumulative Risk Assessment Framework for Waterborne Contaminants

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of environmental Protection 2012年第5期3卷 400-413页

作者： douglas Crawford-Brown Sean Crawford-Brown Cambridge Centre for Climate Change Mitigation Research University of Cambridge Cambridge UK Cambridge Science and Policy Consulting Cambridge UK

A framework is developed and applied for semi-quantitative estimation of cumulative risk from complex mixtures of compounds in water supplies. The framework places these risks onto the unifying metric of Disability Adjusted Life Years (DALYs), and harmonizes cancer and non-cancer, morbidity and mortality, effects. The framework can be used to: 1) calculate a measure of cumulative risk for a given supply, and compare this measure across supplies or across the same supply with candidate treatments applied;2) identify those compounds contributing most significantly to cumulative risk, so risk management measures can be applied most effectively;and 3) quantify the influence of different regulatory limits, for specific compounds, on the cumulative risk from drinking water. Results of application to a hypothetical water supply in which all compounds are at their existing Maximum Contaminant Level (MCL) show the cumulative risk for even a complex mixture may be dominated by a few compounds. In this application, that risk was dominated by as few as 10% of the compounds. The analysis also shows that establishing MCLs based on compounds for which there is an oral slope factor, but where no cancer-based limit has yet been established, probably will have little influence on the relative cumulative risk (as measured by Total Weighted DALY) of different water supplies. This arises primarily because the non-cancer-based MCL is usually more restrictive than the one based on cancer for target probabilities of cancer equal to 1e–4 or 1e–5.

关键词： Risk Water Cumulative Risk

Minimum Requirements for Taxicab Security Cameras

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Transportation Technologies 2014年第3期4卷 216-255页

作者： Shengke Zeng Harlan e. Amandus Alfred A. Amendola Bradley H. Newbraugh douglas M. Cantis Darlene Weaver Division of Safety Research National Institute for Occupational Safety and Health Centers for Disease Control and Prevention Morgantown WV USA

Problem: The homicide rate of taxicab-industry is 20 times greater than that of all workers. A NIOSH study showed that cities with taxicab-security cameras experienced significant reduction in taxicab driver homicides. Methods: Minimum technical requirements and a standard test protocol for taxicab-security cameras for effective taxicab-facial identification were determined. The study took more than 10,000 photographs of human-face charts in a simulated-taxicab with various photographic resolutions, dynamic ranges, lens-distortions, and motion-blurs in various light and cab-seat conditions. Thirteen volunteer photograph-evaluators evaluated these face photographs and voted for the minimum technical requirements for taxicab-security cameras. Results: Five worst-case scenario photographic image quality thresholds were suggested: the resolution of XGA-format, highlight-dynamic-range of 1 eV, twilight-dynamic-range of 3.3 eV, lens-distortion of 30%, and shutter-speed of 1/30 second. Practical Applications: These minimum requirements will help taxicab regulators and fleets to identify effective taxicab-security cameras, and help taxicabsecurity camera manufacturers to improve the camera facial identification capability.

关键词： Taxicab Homicide Facial Identification Photographic Resolution Dynamic Range Lens Distortion Motion Blur