Results 81 to 90 of about 37,717 (232)
Correlation between ECD Spectra and Absolute Configuration of Chiral N2O2-Type Schiff Base Metal Complexes [PDF]
, 2015 手性席夫碱配体及其金属络合物因其容易制备、结构上的易修饰性、多变的配位几何构型、高度不对称的配位环境、独特的电子态和多种金属配位的普适性，具有广泛的基础研究和实际应用价值。本论文以基于salen的含四齿(N2O2)手性席夫碱配体的Ni(II)络合物和Cu(II)络合物为研究对象，对其手性配位立体化学结构、圆二色(ECD)光谱及其绝对构型关联进行了概述。根据晶体结构、固体和溶液ECD光谱表征和ECD光谱理论计算着重探讨了手性[Ni(salen)]衍生物的固态结构和溶液中的绝对构型和优势构象 ...
曾丽丽
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Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity
Conservation Biology, EarlyView.Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca +23 more
wiley +1 more source
Design and Implementation of Parts Managerment System for Sales Chanel [PDF]
, 2015 随着市场经济的多样化发展，企业的经营管理逐渐由粗放式管理，逐渐转入精细化管理的阶段。企业要生存、要发展，需要获得市场的认可，在细分市场中获取足够的市场份额。及时掌握市场终端的动向，是销售企业的一个重要课题。在中国当前高速发展的过程中，许多企业都在积极、快速地争夺市场占有率，通过开设分公司、寻找加盟商、代理商，快速开拓市场渠道，推广产品，获得市场份额。尤其在机电行业领域，配件是提供产品服务重要的战略支柱。而配件数量往往过于繁多，采用既有的邮件、传真、电话等信息传输/共享形式，耗时、耗力，精度 ...
林华伟
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Regulatory compliance and support for altered management of the exotic pet trade
Conservation Biology, EarlyView.Abstract Globally, the exotic pet trade has contributed to species invasion, disease, and animal welfare risks. Although scientists have advocated for increased trade regulation, the success of management and regulatory efforts depends on compliance by participants in the exotic pet trade. We used a regulatory compliance framework to investigate exotic
Elizabeth N. Pratt +3 more
wiley +1 more source
Study on Visual Location System and Trajectory Planning for Industrial Robots [PDF]
, 2015 机器人技术是集机械学、控制理论、电子技术、传感技术、人工智能以及计算机技术等多学科于一体的高新技术，随着机器人技术研究的不断深入，工业机器人在自动化生产中得到了广泛的应用。 目前，机器人的主要研究领域有机器人定位技术、轨迹规划与优化技术、机器人运动学与动力学分析、机器人智能化、机器人控制语言与离线编程等，如何通过对机器人技术的研究以提高其性能与应用价值，是研究人员十分关注的内容。本文针对工业现场中对机器人定位精度与工作效率的要求，对机器人定位技术、轨迹规划与优化技术展开研究 ...
黄文明
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Conservation Biology, EarlyView.Abstract Although significant biodiversity has been safeguarded by protected areas (PAs), biodiversity trends continue downward. Within the frameworks of the EU Biodiversity Strategy for 2030 and the new EU Restoration Regulation (2024), conserving critical biodiversity areas is essential.
George Kefalas +14 more
wiley +1 more source
Dianci bileiqi, 2021 受电容器充放电时间常数、电磁式机械翻牌动作时间的限制,以及放电电流的波形差异的影响,实际运行放电计数器存在不可靠动作的问题,尤其是难以记录多重雷击作用下的动作情况,给过电压分析、避雷器动作状态的评估带来困难。因此,笔者在分析传统放电计数器动作特性基础上,提出改进计数器动作特性的脉冲电流提取方法,设计了相应的脉冲电流测量线圈和信号提取电子电路,实测了信号测量线圈和电子电路的准确性。试验证明,该电流提取线圈能可靠还原冲击电流陡波、标准雷电波和操作波电流波形,误差小于0.2 ...
安志国 +6 more
doaj
, 2016 在隧道建设的桥梁方案、桥隧结合方案、全隧道方案等既有方案各有利弊、选择难以定夺的困惑下,提出一个进一步优化的“蛙泳式”的设计方案,将最大限度地集成各方案的优点、规避其弊端,使通道项目既充分利用了渤海口的各种有利条件,又能够最大限度地保护环境、降低成本、提高安全性。该方案将为项目的可行性提供又一坚实证据,对决策者最终下定“开建”决心具有重要参考价值。
姚中杰, 杨鸿章
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A more‐than‐human political ecology of Indonesian songbird trade
Conservation Biology, EarlyView.Abstract Since its inception, conservation science has considered wildlife trade a problem. In focusing on conservation outcomes, conservationists almost completely ignore the welfare of traded animals and plants and the harms they endure. We developed a political ecology approach that incorporates the interconnectedness of people with animals and ...
Sicily Fiennes +9 more
wiley +1 more source
不同水热调控方式对苹果—大豆间作系统土壤温度和根系分布的影响
Shuitu Baochi Xuebao, 2023 为探究适于黄土区果农间作系统的水热调控方式,选取该区典型的苹果—大豆间作系统为对象,分析不同水热调控方式对间作系统耗水量、土壤温度及根系分布的影响。试验设置3个灌水量上限:田间持水量的50%(W1),65%(W2)和80%(W3);2个覆膜时间:大豆播种至结荚期(M1)和全生育期覆膜(M2)。结果表明:灌水处理的耗水量与灌水量呈正相关,其耗水量较对照提高1.02%~79.11%。土壤温度在分枝和结荚期随土层深度的增加先增后减,最大值出现在15 cm,而在鼓粒期却呈减小趋势。覆膜在生长前期可增温1.13 ...
罗成威 +7 more
doaj