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相关概念视频

ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

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ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and...
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Xylem and Transpiration-driven Transport of Resources02:03

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The xylem of vascular plants distributes water and dissolved minerals that are taken up by the roots to the rest of the plant. The cells that transport xylem sap are dead upon maturity, and the movement of xylem sap is a passive process.
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ATP Driven Pumps II: P-type Pumps01:34

ATP Driven Pumps II: P-type Pumps

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The P-type pumps are a large family of integral membrane transporter ATPases. They are divided into five major types based on substrate specificity, from I to V.
A typical P-type pump has three cytosolic domains: nucleotide-binding (N), phosphorylation (P), and activator (A) domains. These domains are connected to the membrane-spanning helices by short amino acid segments. ATP hydrolysis and covalent phosphoenzyme intermediate formation are crucial parts of the catalytic cycle. At the highly...
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ATP Driven Pumps III: V-type Pumps01:30

ATP Driven Pumps III: V-type Pumps

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V-type pumps are ATP-driven pumps found in the vacuolar membranes of plants, yeast, endosomal and lysosomal membranes of animal cells, plasma membranes of a few specialized eukaryotic cells, and some prokaryotes. They are also known as the V1Vo-ATPase, that couple ATP hydrolysis to transport protons against a concentration gradient.
The peripheral or cytosolic V1 domain with eight subunits is involved in ATP hydrolysis. The integral or transmembrane V0 domain containing at least five subunits...
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Methods of Sterilization I: Physical Methods01:29

Methods of Sterilization I: Physical Methods

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As used in a healthcare facility, sterilization destroys all microorganisms through physical or chemical methods. The physical method includes steam, dry heat, boiling water, and radiation.
Steam sterilization uses non-toxic, low-cost moist heat in the form of saturated steam under pressure, which is fast, microbicidal, and sporicidal, and quickly warms and penetrates fabrics. Autoclaves, or steam sterilizers, expose each item to direct steam contact for a predetermined time at the necessary...
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Drug disposition in the body is a complex process and can be studied using two major approaches: the model and the model-independent approaches.
The model approach uses mathematical models to describe changes in drug concentration over time. Pharmacokinetic models help characterize drug behavior in patients, predict drug concentration in the body fluids, calculate optimum dosage regimens, and evaluate the risk of toxicity. However, ensuring that the model fits the experimental data accurately...
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Author Spotlight: Emerging Technologies and Advanced Tools for Decoding Metabolomics Data Analysis
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根据物理数据驱动的替代模型驱动的飞机组装中的ERS点布局的自适应规划方法.

Shuqiang Xu1, Xiang Huang1, Shuanggao Li1

  • 1College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.

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|February 13, 2026
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概括

本研究介绍了用于飞机组装中增强参考系统 (ERS) 点布局的适应性规划方法,提高了准确性和效率. 与传统方法相比,基于物理,数据驱动的方法显著减少了测量误差.

关键词:
在BP神经网络中,神经网络飞机组件组装机器人组装机器人的组装.坐标变换不确定性 坐标变换不确定性增强的参考系统 (ERS)激光追踪器是一个激光追踪器.

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科学领域:

  • 航空航天工程 航空航天工程
  • 计量学 计量学 计量学
  • 计算几何学的计算几何学

背景情况:

  • 在飞机组装中,增强参考系统 (ERS) 点的手动布局是低效的,容易导致堵塞.
  • 精确的ERS点空间布局对于数字测量辅助组装中的坐标转换精度和稳定性至关重要.

研究的目的:

  • 为ERS点布局提出适应性规划方法,克服手工限制.
  • 为了优化ERS点放置,考虑工程约束,转换灵敏度,空间均性和阻塞避免.

主要方法:

  • 使用测量不确定性表达指南 (GUM) 和加权最小方程构建了一个分析转换灵敏度模型.
  • 开发了一种高精度的BP神经网络替代模型,在蒙特卡洛样本上训练,用于毫秒级别的灵敏度预测.
  • 采用加权遗传算法与光线追踪阻塞检测相结合,以在可行的地面和工具区域内进行优化.

主要成果:

  • 适应性方法有效地避免了封闭,控制注册诱导错误 (RIE) 到大约0.002mm.
  • 注册诱导损失比率 (RILR) 保持在10%左右.
  • 与统一的基线相比,RIE大约减少了40%,证明了卓越的准确性.

结论:

  • 基于物理,数据驱动的优化方法显著提高了飞机组装中的测量可靠性.
  • 该方法遵循工程约束,为自动化数字双胞胎建设提供可靠的解决方案.
  • 该方法为改进数字测量辅助组装过程提供了坚实的理论基础.