搜索结果: 1-15 共查到“screw”相关记录33条 . 查询时间(0.066 秒)
This soft robotic gripper can screw in your light bulbs for you（图）
soft robotic gripper screw in your light bulbs for you
2017/10/25
How many robots does it take to screw in a light bulb? The answer: just one, assuming you’re talking about a new robotic gripper developed by engineers at the University of California San Diego.The en...
Luttinger Liquid in the Core of a Screw Dislocation in Helium-4
Monte carlo simulation hexagonal shaft screw crystals superfluids screw dislocation
2014/12/20
On the basis of first-principles Monte Carlo simulations we find that the screw dislocation along the hexagonal axis of an hcp 4He crystal features a superfluid (at T→0) core. This is the first exampl...
Binding of a 3He Impurity to a Screw Dislocation in Solid 4He
Based on simulation the probability density solid atom the nucleus
2014/12/19
Using first-principles simulations for the probability density of finding a 3He atom in the vicinity of the screw dislocation in solid 4He, we determine the binding energy to the dislocation nucleus E...
Evaluation of Screw Reinforcement on Bearing Performance of Wood Depending on Screw Position
Screw Reinforcement FEM Partial Compression Bearing
2013/1/31
In this study, the reinforcement of wood by screws for partial compression perpendicular to the grain was studied. For the estimation of stiffness and strength, the reinforcement effect of screws depe...
Prediction of Reinforcement Effect by Screw on Triangular Embedment Perpendicular to the Grain with Variation of Screw Locations
Screw Reinforce FEA Rotational Performance Timber Structure
2013/1/31
In this study, the reinforcement by screws for the wood perpendicular to the grain subjected to a rotational moment has been studied. For the estimation of rotational stiffness and yield moment, the r...
螺杆挤压式生物质成型机优化设计与试验（Optimal Design and Experiment of Screw Briquetting Biomass Fuel Machine）
生物质 成型机械 优化设计
2010/12/28
在对螺杆挤压式生物质成型机成型物料的受力及运动进行分析的基础上，将整体螺杆分拆为螺杆头和螺杆主体，将成型套筒拆分为成型活套和保型套筒，对成型机螺杆头部的设计参数螺旋体叶片直径D、叶片螺距S、螺旋轴直径d和套筒数据进行优化设计。试验表明，通过更换螺杆头和成型活套能够降低磨损，螺杆头和螺杆主体的使用寿命可达到90h和1000h，提高了生物质成型燃料的生产量，生产效率与原成型机相比提高了66.12...
食品双螺杆挤出机比能耗定量化研究（Quantitative Study on the Specific Energy Consumption of Food Twin-screw Extruder）
食品 双螺杆挤出机 比能耗
2010/12/28
采用有限元技术，对食品双螺杆挤出机中流体的速度场、压力场进行了仿真研究。通过后处理计算，得到了各种工况下的比能耗。采用可旋转的中心组合设计方法进行了试验，分析仿真与试验结果存在差异的原因，并对仿真计算结果进行了修正。以修正后的仿真计算结果和试验结果为基础，对所建立的BP神经网络进行训练，建立了食品双螺杆挤出机挤压系统模型，此模型可用于挤出机比能耗的定量预测。
A Comparison between Unreamed Locked Intramedullary Nailing and Plate-Screw Fixation in the Treatment of Tibial Diaphyseal Fractures
Close fracture Tibial diaphysis Undreamed tibial nailing Plate Screw
2015/9/21
Background: Tibial diaphyseal fracture is the most common fracture of long bones. In Iran plating and undreamed tibial nailing (UTN) are the most commonly used methods and because of paucity of equipm...
A SIMPLE METHOD OF IN-VITRO CULTURE OF PLASMODIUM FALCIPARUM IN SCREW-CAPPED VIALS1
In-vitro culture techniques multiplication rates
2009/12/30
In a preliminary study carried out in a simple field laboratory in Bandar-Abbas, southern Iran, five isolates of P. falciparum collected from the patients was cultured in RPMI 1640 medium with human s...
A COMPARISON OF PULLOUT STRENGTH OF PEDICULAR SCREWS BETWEEN DIFFERENT METHODS OF SCREW INSERTION IN POSTERIOR FIXATION OF THORACIC SPINE
Pedicle screw spine thoracic intratransverse process pullout strength
2009/12/18
Pedicle screws provide rigid fixation for instabilities in the lumbar and lumbosacral spine. Anatomical consideration and potential risk of neurologic complications are the reasons to hesitate using p...
Biomechanical analysis of tibia – double threaded screw fixation
Numerical techniques Finite Elements Methods Biomaterials
2009/12/2
Purpose: The aim of the work was determination of biomechanical characteristics of a tibia – double threaded
screw system with the use of finite element method.
Design/methodology/approach: Geometr...
把机床传动丝杠简化为承受预拉伸力和移动力作用的旋转Timoshenko梁，综合考虑了陀螺效应、预拉伸力和移动力对丝杠振动的影响，以及丝杠两端轴承的支承作用，建立了弹性支承条件下丝杠的频率方程，利用拉格朗日方程建立了丝杠的动力学模型，利用振型叠加原理和隆格-库塔法求解，分析了系统参数对丝杠涡动转速和横向振动的影响。
Influence of lateral-oblique cyclic loading on abutment screw loosening of internal and external hexagon implants
Screw loosening Preload Abutment screw
2009/9/11
To date, there is no evidence that internal anti-rotation configurations are better than external ones. The purpose of this study was to evaluate the effect of eccentric cyclic loading on abutment scr...
设计了一种应用滚珠丝杠传动、直流电动机驱动的恒速(30mm/s)土壤圆锥指数测量装置。将电动机驱动滚珠丝杠传动方式应用于土壤参数测量装置，具有较高的运行控制精度和机械传动效率。在机电一体化设计方面，研制的专用微控制器既负责协调土壤坚实度信息与纵向行进深度动态信息的实时获取和运行状态监控，又同时与GPS模块和PDA连接。充分利用PDA提供的软硬件资源，可实现农田数据的大容量存储和智能化信息处理。田间...
三螺杆挤压机熔体输送段功耗特性的数值分析（Numerical Simulation of Power Consumption Characteristics in Conveying Element in Triple Screw Extruder）
三螺杆挤压机 熔体输送段 功耗
2009/8/11
利用CFD技术，采用三维流—热耦合模型对三螺杆挤压机流场、温度场、压力场和粘性生热分布进行了研究。在此基础上，考虑熔体粘性耗散生热和压力升高的影响，研究了螺杆转速、螺纹头数、压力差和挤出量等参数对三螺杆挤压机挤出功耗和比能产量的影响，并和常规双螺杆挤压机进行了对比分析。结果表明，随着螺杆转速、流道两端压力差和挤出量的增加，三螺杆挤压机的挤出功耗逐渐增加，而比能产量却逐渐减小。随着螺杆螺纹头数的增加...