检索结果-南通市图书馆

Journal of Forestry Research 2020年第6期31卷 2181-2191页

作者： Erik c.berg Stanley J.Zarnoch W.Henry McNab University of Montana Bureau of Business and Economic ResearchMissoulaMT 59812USA USDA Forest Service Southern Research Station AshevilleNC 28806USA

Little is known of the tree and stand dynamics of varied species of planted Paulownia left unmanaged until harvest in the southeastern United *** sought to remedy this lack of information needed by land managers to make informed decisions by investigating diff erences in survivorship,attained diameter breast height(DBH),diameter at ground level,total height,tree volume and standlevel volume yields of planted ***,***,and *** in the cool-moist environment of the southern Appalachian *** 9 years,combined-species survivorship was only 27.3%.Low survivorship was likely related to several inclement weather *** was signifi cantly smaller in DBH and total *** combined-species stem(bole)volume models were developed as functions of(1)DBH squared,(2)the product DBH squared and total height,and(3)the product diameter ground line squared and total *** total volume production of unmanaged stands was greatest for *** and *** 4 years after planting;by the 9th year,total volume of *** was greater than the other two *** of our study provide managers information on productivity of three species of Paulownia that can be used for estimating plantation yields.

关键词： Diameter Tree height Stand structure Stem volume Paulownia

在线全文

学校读者我要写书评

暂无评论

禽流感及其它接触性传染病对家禽福利的影响

中国家禽 2010年第4期32卷 36-37页

作者： c.berg 朱云芬(译) 瑞典农业大学不详

现代规模化家禽生产结构，使得传染性病毒病、细菌病及寄生虫病能够在很短的时间内感染大量禽只。最近几年，高致病性禽流感（HPAI）已经在世界多个地区相继暴发。禽流感、新城疫以及其它严重疾病的暴发，不但造成了严重的经济损失，同... 详细信息

现代规模化家禽生产结构，使得传染性病毒病、细菌病及寄生虫病能够在很短的时间内感染大量禽只。最近几年，高致病性禽流感（HPAI）已经在世界多个地区相继暴发。禽流感、新城疫以及其它严重疾病的暴发，不但造成了严重的经济损失，同时也带来了大量的家禽福利问题。本文将重点以禽流感为例，阐述相关传染性疾病对家禽福利造成的影响。

关键词：高致病性禽流感福利问题接触性传染病家禽传染性疾病生产结构寄生虫病经济损失

在线全文

学校读者我要写书评

暂无评论

半球视域天线用轻型天线罩的设计与制造

系统工程与电子技术 1979年第2期 64-67页

作者： Michael costagliola ,Roy c.berg ,王勤

本文叙述了一种独特的介质天线罩的设计与制造。这种天线罩不仅可提供环境保护,而且还能准确地将25000个无源相位延迟模件置于其表面上。该天线罩的直径为113英寸,高为99英寸,内蒙皮上连接106条圆形棱边作为模件的定位沟槽。研制了一种... 详细信息

本文叙述了一种独特的介质天线罩的设计与制造。这种天线罩不仅可提供环境保护,而且还能准确地将25000个无源相位延迟模件置于其表面上。该天线罩的直径为113英寸,高为99英寸,内蒙皮上连接106条圆形棱边作为模件的定位沟槽。研制了一种新式工装,即用一种廉价的“易碎”的熟石膏模制造圆顶。最后制成的部件符合全部尺寸要求,其重量仅有330磅。

关键词：天线罩模件天线辅助设备模块介质天线圆顶半球视域

Status and prospects for symmetric organic redox flow batteries

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy chemistry 2025年第1期100卷 125-143页

作者： Md Al Raihan c.Adam Dyker Department of chemistry University of New Brunswick

As environmental concerns from fossil fuel consumption intensify, large-scale energy storage becomes imperative for the integration of renewable sources like wind, hydro, and solar with the electrical *** flow batteries, particularly those employing organic molecules, are positioned as a key technology for this purpose. This review explores the growing field of symmetric organic redox flow batteries(ORFBs) within this context. Unlike traditional asymmetric designs based on unique active materials for each electrode, symmetric ORFBs involve a single bipolar species for both electrodes. This review highlights the benefits of a symmetric design, and categorizes five distinct classes of organic bipolar molecules used in both aqueous and non-aqueous solvents. By providing a comprehensive overview of their cell cycling and performance characteristics, the strengths and weaknesses of the diverse categories of bipolar molecules are highlighted for both solvent systems, as are opportunities for future development. This should guide new research directions and advance the development of practical symmetric ORFBs.

关键词： Redox flow battery Symmetric battery Organic battery Aqueous electrolyte Non-aqueous electrolyte

Decision support model for effects estimation and proportionality assessment for targeting in cyber operations

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Defence Technology（防务技术） 2021年第2期17卷 352-374页

作者： c.Maathuis W.Pieters J.van den berg Delft University of Technology Jaffalaan 52628 BXDelftNetherlands TNO Military Operations Oude Waaldorperweg 632597 AKDen HaagNetherlands Netherlands Defense Academy De la Reyweg 1204818 BBBredaNetherlands Open University of the Netherlands Valkenburgerweg 1776419 ATHeerlenNetherlands

cyber operations are relatively a new phenomenon of the last two *** that period,they have increased in number,complexity,and agility,while their design and development have been processes well kept under *** a consequence,limited data(sets)regarding these incidents are *** various academic and practitioner public communities addressed some of the key points and dilemmas that surround cyber operations(such as attack,target identification and selection,and collateral damage),still methodologies and models are needed in order to plan,execute,and assess them in a responsibly and legally compliant *** on these facts,it is the aim of this article to propose a model that i))estimates and classifies the effects of cyber operations,and ii)assesses proportionality in order to support targeting decisions in cyber *** order to do that,a multi-layered fuzzy model was designed and implemented by analysing real and virtual realistic cyber operations combined with interviews and focus groups with technical e military *** proposed model was evaluated on two cyber operations use cases in a focus group with four technical e military *** the design and the results of the evaluation are revealed in this article.

关键词： cyber operations cyber warfare cyber weapons Artificial intelligence Fuzzy logic Targeting

Acquired sensorineural hearing loss,oxidative stress,and microRNAs

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第9期20卷 2513-2519页

作者： Desmond A.Nunez Ru c.Guo Division of Otolaryngology–Head&Neck Surgery Department of SurgeryFaculty of MedicineThe University of British ColumbiaVancouverBCCanada Division of Otolaryngology–Head&Neck Surgery Gordon&Leslie Diamond Health Care CentreVancouver General HospitalVancouverBCCanada Faculty of Medicine–The University of British columbia VancouverBCCanada

Hearing loss is the third leading cause of human ***-related hearing loss,one type of acquired sensorineural hearing loss,is largely responsible for this escalating global health ***-induced,ototoxic,and idiopathic sudden sensorineural are other less common types of acquired hearing *** etiology of these conditions is complex and multi-fa ctorial involving an interplay of genetic and environmental *** stress has recently been proposed as a likely linking cause in most types of acquired sensorineural hearing *** non-coding RNA sequences known as microRNAs(miRNAs)have increasingly been shown to play a role in cellular hypoxia and oxidative stress responses including promoting an apoptotic *** hair cell death is a central histopathological finding in sensorineural hearing *** these cells do not regenerate in humans,it underlies the irreversibility of human age-related hearing *** EMBASE,Ovid MEDLINE,Web of Science core collection,and *** databases over the period August 1,2018 to July 31,2023 were searched with"hearing loss,""hypoxamiRs,""hypoxia,""microRNAs,""ischemia,"and"oxidative stress"text words for English language primary study publications or registered clinical *** red clinical trials known to the senior author we re also assessed.A total of 222studies were thus *** excluding duplicates,editorials,retra ctions,secondary research studies,and non-English language articles,39 primary studies and clinical trials underwent full-text *** resulted in 11 animal,in vitro,and/or human subject journal articles and 8 registered clinical trial database entries which form the basis of this narrative *** miR-34a and miR-29b levels increase with age in *** miRNAs were demonstrated in human neuroblastoma and murine cochlear cell lines to target Sirtuin 1/peroxisome proliferato r-activated receptor gamma coactivator-1-alpha(SIRT1/P Gc-1α),SIRT

关键词： hearing loss hypoxia microRNAs oxidative stress sensorineural

Multiple sclerosis is at a checkpoint: advancing the program

在线全文

学校读者我要写书评

暂无评论

Neural Regeneration Research 2025年第3期20卷 811-812页

作者： Brandon c.Smith Jessica L.Williams Department of Neurosciences Lerner Research InstituteCleveland ClinicClevelandOHUSA Department of Biological Geologicaland Environmental SciencesCleveland State UniversityClevelandOHUSA

Multiple sclerosis(MS) is a chronic inflammatory and demyelinating disease of the central nervous system(cNS). Patients with MS experience sensory and motor function loss due to myelin and/or axon damage perpetuated b... 详细信息

关键词： Hauser sclerosis damage

A cALcULUS FOR SERVIcES INNOVATION

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Science and Systems Engineering 2007年第2期16卷 129-165页

作者： James M. TIEN Daniel berg Department of Decision Sciences and Engineering Systems Rensselaer Polytechnic Institute Troy New York USA

Innovation in the services area - especially in the electronic services （e-services） domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers （i.e., collaboration, customization, integration and adaptation）, three business foci （i.e., creation-focused, solution-focused and competition-focused）, six business principles （i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy）, eight technical enablers （i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization）, and six attributes of decision informatics （i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive）. It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the gro

关键词： Services innovation decision informatics software algorithms automation globalization collaboration customization integration adaptation standardization telecommunication organization business principles

ON SERVIcES RESEARcH AND EDUcATION

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

Journal of Systems Science and Systems Engineering 2006年第3期15卷 257-283页

作者： James M.TIEN Daniel berg Department of Decision Sciences and Engineering Systems Rensselaer Polytechnic Institute

The importance of the services sector can not be overstated; it employs 82.1 percent of the U. S. workforce and 69 percent of graduates from an example technological university. Yet, university research and education have not followed suit. clearly, services research and education deserve our critical attention and support since services - and services innovation - serve as an indispensable engine for global economic growth. The theme of this paper is that we can and should build services research and education on what has occurred in manufacturing research （especially in regard to customization and intellectual property） and education; indeed, services and manufactured goods become indistinguishable as they are jointly co-produced in real-time. Fortunately, inasmuch as manufacturing concepts, methodologies and technologies have been developed and refined over a long period of time （i.e., since the 1800s）, the complementary set of concepts, methodologies and technologies for services are more obvious. However, while new technologies （e.g., the Internet） and globalization trends have served to enable, if not facilitate, services innovation, the same technologies （e.g., the Internet） and 21st century realities （e.g., terrorism） are making services innovation a far more complex problem and, in fact, may be undermining previous innovations in both services and manufacturing. Finally, there is a need to define a ＂knowledge-adjusted＂ GDP metric that can more adequately measure the growing knowledge economy, one driven by intangible ideas and services innovation.

关键词： Services manufacturing customization innovation education intellectual property

Developments in Humidity Standards and the Psychrometer Equation

在线全文

学校读者我要写书评

暂无评论

chinese Journal of chemical Engineering 2004年第6期12卷 792-800页

作者： Ian c.Kemp carl-Gustav berg Hyprotech UK Aspen Technology Gemini Building Fermi Avenue Harwell Business Centre Didcot Oxfordshire OX11 0QR U.K.Process Design Laboratory Faculty of Chemical Engineering Abo Akademi University Biskopsgatan 8 FIN-20500 Abo FINLAND

Determination of the wet-bulb temperature at the surface of a material is the basis of one class ofhumidity measuring instruments, and is important in industrial applications such as dryer modelling and simula-tion. The psychrometer equation is a frequently used method of estimating wet-bulb temperature, and contains apsychrometer 'constant'. Analysis shows that this is in fact a variable coefficient affected by temperature, pressure,radiation and conduction effects, and the identity of the gas and vapour. Radiation and conduction affect the dif-ference between adiabatic saturation temperature and indicated wet-bulb temperature. Inconsistencies in currentlyrecommended values for the psychrometer coefficient, including published international standards, are identifiedand explained. Particular problems arise when the enhancement factor is applied to vapour pressure to accountfor non-ideality of gases. Special considerations are also needed for wet-bulb temperatures approaching the boilingpoint, where the psychrometer coefficient tends to zero. Self-consistent recommendations recently published in thenew British Standard BS1339 are given, which cover both the air-water system and a general vapour-gas system.

关键词： psychrometry humidity standards convection diffusion enhancement factor