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相关概念视频

Rolling Resistance: Problem Solving01:17

Rolling Resistance: Problem Solving

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Rolling resistance, also known as rolling friction, is the force that resists the motion of a rolling object, such as a wheel, tire, or ball, when it moves over a surface. It is caused by the deformation of the object and the surface in contact with each other, as well as other factors like internal friction, hysteresis, and energy losses within the materials. Rolling resistance opposes the object's motion, requiring additional energy to overcome it and maintain movement. In practical...
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Distributed Loads: Problem Solving01:21

Distributed Loads: Problem Solving

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Beams are structural elements commonly employed in engineering applications requiring different load-carrying capacities. The first step in analyzing a beam under a distributed load is to simplify the problem by dividing the load into smaller regions, which allows one to consider each region separately and calculate the magnitude of the equivalent resultant load acting on each portion of the beam. The magnitude of the equivalent resultant load for each region can be determined by calculating...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

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Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
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Design Example: Alignment of a Road Line Using GIS01:17

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The alignment of a road line using Geographic Information Systems (GIS) is a critical process in civil engineering, combining advanced technology with practical decision-making. This methodology begins with the collection of geospatial data, including information on land cover, geomorphology, drainage patterns, slope, and contour details. Such data is typically acquired through satellite imagery and GIS tools, offering a comprehensive understanding of the terrain.Once the data is gathered, it...
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Short-distance Transport of Resources02:12

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Short-distance transport refers to transport that occurs over a distance of just 2-3 cells, crossing the plasma membrane in the process. Small uncharged molecules, such as oxygen, carbon dioxide, and water, can diffuse across the plasma membrane on their own. In contrast, ions and larger molecules require the assistance of transport proteins due to their charge or size. Transport across membranes also occurs within individual cells, playing a variety of essential roles for the plant as a whole.
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The maximum power flow for lossy transmission lines is derived using ABCD parameters in phasor form. These parameters create a matrix relationship between the sending-end and receiving-end voltages and currents, allowing the determination of the receiving-end current. This relationship facilitates calculating the complex power delivered to the receiving end, from which real and reactive power components are derived.
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Updated: May 23, 2025

Spatial Multiobjective Optimization of Agricultural Conservation Practices using a SWAT Model and an Evolutionary Algorithm
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绿色车辆路由优化基于动态约束选择共进化的算法.

Lu-Jie Zhou1, Hai-Fei Zhang2, Jun-Hao Fu3,4

  • 1School of Automobile and Transportation, Tianjin University of Technology and Education, Tianjin, 300222, China.

Scientific reports
|May 21, 2025
PubMed
概括
此摘要是机器生成的。

本研究引入了绿色车辆路线的新模型,考虑实时流量和交付时间窗口. 开发的算法有效地降低了物流运营的成本和排放.

关键词:
共同进化的算法.动态约束选择选择动态约束选择物流分销物流分销物流分销多目标优化多目标优化时间变化的财产.

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科学领域:

  • 运营研究 运营研究
  • 运输 运输 物流 后勤
  • 环境可持续性 环境可持续性

背景情况:

  • 现有的绿色车辆路线模型往往缺乏单一目标的解决方案,并且无法考虑实时速度变化.
  • 变化速度和容量等动态因素对物流中的碳排放产生重大影响.

研究的目的:

  • 建立一个多目标绿色车辆路由问题,在时间变化的条件下 (MOGVRPTW-TV) 设有时间窗口限制.
  • 为解决MOGVRPTW-TV.TV提出一个基于共进化的框架的受约束的多目标进化算法.

主要方法:

  • 开发了一个模型,包括时间变化的速度和容量变化影响碳排放.
  • 提出了一种共同进化的算法,其中包括用于解决方案多样性的转移拥挤距离,以及用于优化动态约束选择策略.

主要成果:

  • 该算法有效地避免了交通拥堵时期.
  • 证明了总体分销成本的大幅降低.
  • 实现了车辆更低的燃料消耗和碳排放.

结论:

  • 拟议的MOGVRPTW-TV模型及其相关算法为复杂的物流挑战提供了有效的解决方案.
  • 该方法平衡了融合和多样性,从而提高了绿色物流的效率和环境效益.