Results 61 to 70 of about 24,333 (149)
Jixie chuandong, 2005 换档性能是湿式摩擦片离合器的诸多重要特性之一。换档转矩是离合器的一个重要的特征值。相对应于各种摩擦面组合,滑动速度、比压、温度等参数均影响换档转矩-时间曲线。设计离合器时应注意这几个参数应不超过本文中所列的极限值;对不同的摩擦面制造方式,摩擦面的松开时间不同,对转矩的影响也不同;离合器加压的时间进程快慢,摩擦面的数目多少,冷却油粘度大小,均不同程度影响了换挡品质;油中不同添加剂对摩擦性能会产生不同影响;油温太高,油的老化均会对换档性能产生不利影响。根据离合器的应用工况,合理确定各个参数,可使换挡性能最佳。
李科花, 周卜生
doaj
World Food Policy, Volume 12, Issue 2, November 2026.ABSTRACT Prevailing levels of hunger, malnutrition, and food insecurity—driven by conflict, global economic crises, and ecological destruction—are threatening fulfillment of the right to adequate food. The integration of human rights in food systems policies can address these challenges; however, progress in the adoption of human rights–based ...
Ellen Johnson +4 more
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Policy Studies Journal, Volume 54, Issue 4, November 2026.ABSTRACT The intersection of immigration and welfare has taken a central stage in the politics of social policy and garnered increasing scholarly attention in welfare politics research. While prior research has examined how immigration affects welfare support and welfare generosity in the US, less is known about the determinants of immigrant‐related ...
Ping Xu, Ling Zhu, Sebastian Ege
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Review of Policy Research, Volume 43, Issue 6, November 2026.ABSTRACT Nature conservation conflicts increasingly extend beyond ecological objectives to disputes over decision‐making legitimacy, institutional authority, and competing understandings of landscape and expertise. This article examines the conflict over the proposed designation of Křivoklátsko as a national park in the Czech Republic between 2021 and ...
Filip Simon
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Zhendong Ceshi yu Zhenduan为了实现液体火箭发动机组件在地面力学环境试验中的响应与其实际工作状态下的响应特征一致，提升组件试验考核的有效性，从边界映射途径出发，讨论了组件力学环境响应一致的边界映射问题的理论求解，提出了通过设计优化进行组件试验边界映射的工程解决方法。基于二代非支配排序遗传算法（non‑dominated sorting genetic algorithms‑II，简称NSGA‑II）和有限元联合仿真，对某型发动机推力装置组件地面力学环境试验的边界约束结构进行优化设计，获得了满足响应特征要求的组件试验边界约束结构形式，
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Systematic studies on the fatigue deformation and damage mechanisms of nickel‐based single‐crystal superalloys (Ni‐SXs) under combined thermal and mechanical conditions remain limited, particularly regarding the influence of strain amplitude on the relative contributions of fatigue and oxidation damage.
Liyin Zhang +7 more
wiley +1 more source
Shuitu Baochi Xuebao, 2023 探究不同人为管理措施坡耕地地表微地形变化特征,阐明地表微地形变化对渗流响应,以期为紫色土坡耕地水土流失的有效防治与人为管理措施的合理布设提供科学依据。以平整坡面、穴播坡面和垄作坡面为研究对象,基于室内人工模拟渗流试验,开展5°和15°紫色土坡面微地形变化特征研究。结果表明:(1)渗流试验前后平整坡面、垄作坡面和穴播坡面微地形半方差函数在0~135°和180°~315°方向上呈中心对称分布,随地表坡度的增加分布范围逐渐缩小,且具有明显的方向性。渗流条件下,平整坡面和穴播坡面微地形各向异性的变化趋势较为一致,
杨斐雄 +3 more
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Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Developing rapid, precise gas sensors for Listeria monocytogenes (LM) biomarker detection faces challenges due to suboptimal gas‐solid interactions. Herein, we report the rational synthesis of amino‐functionalized mesoporous SiO2 hollow nano‐doughnuts (MS‐2‐NH2‐2) via modification with (3‐aminopropyl) trimethoxysilane (AAPTMS), which enables ...
Xingyu Wang +7 more
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Zhongguo shiyan zhenduanxue, 2015 目的应用响应曲面分析法建立最佳的舒芬太尼复合氟比洛芬酯静脉术后镇痛模型,获得满意的镇痛效果,降低副作用的发生。方法选择ASAI-II级的肿瘤患者,年龄18-70岁,行胸腹部手术70例,随机分为对照组和实验组。对照组术后给予静脉镇痛泵舒芬太尼200μg+氟比洛芬酯150mg+生理盐水到250ml,实验组通过建立舒芬太尼与氟比洛芬酯相互作用响应曲面模型,获得理想的药物配置浓度,与常规配比方案进行效果和副作用发生率的比较。结果通过应用响应曲面分析法获得的舒芬太尼复合凯纷镇痛浓度方案 ...
刘文涛, 关雷
doaj
Ultrasonic Vibration Assisted Laser Processing: A Hybrid Paradigm for Extreme Surface Enhancement
Rare Metals, Volume 45, Issue 10, October 2026.ABSTRACT Traditional laser processing techniques offer many advantages, but they often encounter limitations such as heat‐affected zones, recast layers, residual tensile stresses, and poor surface finish. The integration of ultrasonic vibration (UV) presents a promising hybrid approach to overcome these challenges by introducing beneficial effects like
Aziz Ul Hassan Mohsan +6 more
wiley +1 more source