Results 21 to 30 of about 16,679 (163)
Research on Structural Design and Mechanical Behavior of Double Arc Tooth Profile Harmonic Drive [PDF]
, 2015 谐波齿轮减速器是一种传动精度高、减速比大并能够在密闭空间传动的齿轮传动机构，应用领域广泛，尤其在航空航天领域有不可替代的优势。常用的渐开线齿廓齿根处会出现应力集中以及齿顶产生尖点啮合现象，影响其承载性能和啮合质量。双圆弧齿形谐波齿轮以其良好的承载能力与啮合性能逐渐成为研究热点，本文根据谐波齿轮设计理论设计了双圆弧谐波齿轮装置，并对其结构性能、接触特性以及动力学等方面的分析，探索相关规律，为后续在结构优化、增强啮合性能提供了一定的理论依据。 论文主要包括以下几方面内容： 1 ...
王萌萌
core
Conservation Biology, EarlyView.Abstract Despite the crucial role of human impacts on biodiversity loss, many assessments of this loss focus on single metrics, such as species richness, and overlook the multidimensional effects of human activities. Because of its importance to ecosystem functioning, we investigated the functional diversity of medium‐ and large‐sized mammal ...
Xueyou Li +8 more
wiley +1 more source
Study on pressure relief and permeability enhancement effect of cutting coal seam with diamond-bead wire saw [PDF]
In order to explore the pressure relief and permeability enhancement effect around coal seam slot cut by diamond-bead wire saw, firstly, the mechanical model of a doubly clamped roof beam based on the stress of the slot roof was established to analyze ...
Chen WANG +8 more
core +1 more source
Conservation Biology, EarlyView.Abstract Constructed value of information (CVoI) is an expert elicitation decision‐analytic tool used to prioritize sources of uncertainty based on their potential to improve decision outcomes if resolved. Despite increased application of CVoI, the robustness of CVoI prioritization of sources of uncertainty relative to differences in expert elicitation
Kristin P. Davis +7 more
wiley +1 more source
Study on Preparation and Application of Adhesive for Polyolefin Film [PDF]
, 2015 由于具有较高的机械强度、良好的化学稳定性、较好的电绝缘性、优良的加工性等优势，聚烯烃塑料广泛应用于社会生活中。在众多的聚烯烃塑料制品中，最为常见的产品是薄膜制品，包括聚乙烯薄膜、聚丙烯薄膜、多层共挤聚烯烃薄膜等。为了获得更优异的性能，实际应用中一般将聚烯烃薄膜与自身或者其他薄膜（如铝箔、聚酰胺薄膜、聚酯薄膜等）进行复合使用。目前，在复合过程中常用的聚烯烃薄膜粘结剂存在以下两个问题：1、环保问题：目前国内广泛使用的酯溶型聚氨酯粘结剂可能含有异氰酸酯单体的残留，而水性粘结剂由于干燥速度慢 ...
谢东权
core
Mechanism of rock burst induced within the fully mechanized top coal caving face with overlying knife-shape-like gob and hard thick roof [PDF]
Irregular upper gobs may increase the risk of rock burst incidents in coal mines. Investigating the rock burst mechanism in the complex mining spatial structure of multi-seam rock bursts is essential for ensuring the safe extraction of coal resources ...
Chao ZHOU +6 more
core +1 more source
Multi-factor coupling analysis of large-energy events in a kilometer deep mine [PDF]
, 2023 Based on the research background of Shandong Lilou Coal Mine, this paper used methods such as on-site investigation, engineering comparison, and on-site monitoring to research on the high-energy events that have occurred in Lilou Coal Mine since 2020 ...
Cheng ZHAO +10 more
core +1 more source
Biodiversity‐driven spatial conservation planning to delineate temporally stable regions
Conservation Biology, EarlyView.Abstract The accelerating loss of biodiversity underscores the critical need for effective conservation strategies, particularly in the face of climate change and anthropogenic pressures. We devised a conservation planning framework that adopts a temporal stacking approach to species distribution models and landscape connectivity analyses. These models
Mattia Iannella +5 more
wiley +1 more source
Study on the stress evolution law of surrounding rock and cooperative control technology in coal seam group mining [PDF]
Aiming at addressing the challenges encountered in roadway support during coal seam group mining, this project focuses on the 212 main return-air cross-cut in Tucheng Mine, Guizhou Province.
Jitao ZHANG +8 more
core +1 more source
Defining and identifying relevant stakeholders to advance effective conservation
Conservation Biology, EarlyView.The challenge of defining stakeholders in environmental science and an approach for refining existing definitions. Abstract Stakeholder is a contested term that has spawned a multitude of ad hoc definitions. The ambiguity of these definitions has oftentimes impeded transdisciplinary research in environmental governance and conservation science because ...
Milan Büscher +5 more
wiley +1 more source