搜索结果: 1-15 共查到“工学 feed”相关记录36条 . 查询时间(0.207 秒)
Fallowing cattle-feed farmland simplest way to alleviate western water shortages（图）
Fallowing cattle-feed farmland simplest western water shortages
2020/3/6
The rate at which humans consume fresh water is now approaching or surpassing the rate at which water sources are naturally replenished, creating shortages for people and ecosystems.In the western U.S...
FAST INDOOR MAPPING TO FEED AN INDOOR DB FOR BUILDING AND FACILITY MANAGEMENT
3D Survey Mobile Mapping System SLAM Laser Scanner Spherical Images Point Cloud Facility Management
2019/3/1
Facility Management activities require to collect and organize a large amount of information about a building as, for example, geometry, MEP structures, lighting and antifire devices, typologies of fu...
QESST for solar power to feed an energy hungry world
QESST solar power energy hungry world
2015/9/18
Modern society is very much defined by its access to electricity. What if researchers could advance sustainable energy technologies to the point where everyone around the world had access to clean, ch...
A novel sorbent for solid-phase extraction coupling to high performance liquid chromatography for the determination of olaquindox in fish feed
HPCL molecular imprinting SPE olaquindox
2014/10/11
A new and hydrophilic molecularly imprinted polymer (MIP) selective for olaquindox was prepared by bulk polymerisation using methacrylic acid as the functional monomer and ethylene glycol dimethacryla...
Ultra-low-voltage Micro-ring Modulator Integrated with a CMOS Feed-forward Equalization Driver
Waveguide modulators Photonic integrated circuits
2015/5/26
We present an all-CMOS micro-ring modulator packaged with a feed-forward equalization driver circuit, operating in charge-injection mode at 8 Gbps with a drive voltage of only 50 mVp-p and a power con...
电动助力转向综合前馈和模糊PID反馈的电流控制算法（Feed-forward Integrated with Fuzzy PID Feedback Current Control Algorithm in Electric Power Steering）
车辆 电动助力转向 电流跟随 前馈控制
2010/12/29
针对电动助力转向中的电流跟随控制问题，通过建立系统数学模型，分析系统型别，研究了常规PID控制和模糊PID控制在电流控制中的不足，采用前馈和反馈综合控制的思想，提出了综合前馈和模糊PID反馈的电流控制算法。通过实验对比表明，前馈和模糊PID反馈的综合控制方法可显著提高电流跟随控制的稳定性、快速性和准确性。
考虑摩擦和间隙影响的机床进给伺服系统建模与分析（Modeling and Analysis of Machine Tool Feed Servo Systems with Friction and Backlash）
机床 进给伺服系统 摩擦
2010/12/28
进给伺服系统的性能对数控机床的跟踪及定位精度、加工质量等有着重要的作用。摩擦和间隙的非线性会导致系统的爬行、振荡等不稳定行为。针对闭环控制的直联式进给伺服系统，建立了考虑摩擦和间隙的综合力学模型和数学模型。研究了低速进给条件下摩擦和间隙非线性对工作台输出的影响，得出了工作台产生爬行现象的几种可能条件，并给出消除进给系统爬行现象的几种常见措施。所得结论为进给伺服系统的优化设计和性能预测提供了理论支持...
饲料粉碎机锤片磨损特征与自磨刃强化处理（Wearing Characteristics and Self-sharpening Enhanced Treatment of Feed Grinder Hammer）
粉碎机 锤片 气体渗碳
2010/12/28
在分析粉碎机锤片磨损钝化过程中形貌变化对加工效率影响的基础上，提出了锤片自磨刃强化处理的工艺方法。采用气体渗碳方法对粉碎机锤片两侧面进行渗碳处理，对锤片端面及轴孔作防渗处理，配合相应的热处理工艺，使锤片两侧刃和刃间形成不同的金相组织，两侧刃的硬度远大于刃间硬度。经生产试验证实，在锤片的整个工作过程中不形成断面圆角，保持了对物料的正面打击和棱角剪切作用。
Evaluation of Streptomyces as a Probiotic Feed for the Growth of Ornamental Fish Xiphophorus helleri
probiotics Actinobacteria Streptomyces ornamental fish Xiphophorus helleri
2011/2/24
The potential of Streptomyces as a probiotic feed for the growth of ornamental fish Xiphophorus helleri has been investigated. The Streptomyces strains used as probiotics were isolated from the marine...
Wavelet Neural Network Based on NARMA-L2 Model for Prediction of Thermal Characteristics in a Feed System
wavelet neural network NARMA-L2 model particle swarm optimization
2011/8/3
Research of thermal characteristics has been a key issue in the development of high-speed feed system. Most of the work carried out thus far is based on the principle of directly mapping the thermal e...
加工路径段进给速度的转接及加减速处理方法（Transiting and Acceleration/Deceleration Methods for Feed-speed of Machined Path Segments）
高速加工 进给速度 加减速
2010/1/28
针对高速高精加工对数控系统在进给速度控制方面的要求，根据相邻路径段间的转接角大小建立了可直接进行段间转接的条件,并研究了该条件不成立时对转接速度的修正问题。提出了段内加减速的处理基本原则,并在保持路径段长度不变的基础上对路径段内的进给速度重新进行规划，避免了以往插补前加减速方法中减速点和终点预测困难的问题。实际计算结果表明，相对零速度转接加减速处理方法，所提出的方法在同样保证加工精度等基础上提高了...
Mathematical model for feed drive system in microscopic motion area
Machine tool Feed drive system Driving torque Rolling element
2009/12/2
Purpose: Our objective is to develop an entirely new the feed drive system with the accuracy of tens nanometers and the stroke of tens millimetres achieved by only one mechanism.
Design/methodology/a...
基于NIRS的反刍动物饲料中肉骨粉判别（Discriminant Analysis of Meat and Bone Meal Content in Ruminant Feed Based on NIRS）
反刍动物饲料 肉骨粉 近红外反射光谱
2009/8/11
收集国内常用的、具有代表性的精料补充料和肉骨粉，制备定标集样品235个，外部验证集样品152个。在400～2498nm波长范围内进行近红外光谱扫描，选择合适的光谱预处理方法和光谱范围，采用SIMCA方法和DPLS方法分别建立判别分析模型。建立的SIMCA判别分析模型对外部验证集的正确判断率为96.1%，建立的DPLS判别分析模型对外部验证集的正确判断率为100%。与NIRS定量分析精料补充料中MB...
W-band 3.75-Gb/s 8PSK Wireless Signal Generation and Transmission via Optical Frequency Octupling and Bias Modulation of NBUTC-PD with Feed-Forward Equalizer
Wireless Signal Generation Optical Frequency Octupling NBUTC-PD Feed-Forward Equalizer
2015/7/17
Generation and transmission of a wireless W-band 8PSK signal with 3.75-Gb/s data rate are experimentally demonstrated. The W-band carrier is generated from millimeter-wave generation with frequency oc...
4HLB-2型半喂入花生联合收获机试验（Experiment on 4HLB-2 Type Half Feed Peanut Combine Harvester）
花生 联合收获机 试验 参数优化
2010/5/5
为了提高4HLB-2型半喂入花生联合收获机作业性能，通过单因素试验和两因素全试验，研究了土壤含水率、收获期、夹持高度、清土频率和振幅、摘果辊转速和夹持输送速度对收获损失和含土率的影响。结果表明：收获沙壤土花生的适宜土壤含水率为8％～15％；花生生长后期，清土落果损失率逐渐增加，当根茎拉断力小于5N时，落果损失率大于2％；机器收获的最佳夹持高度为150～200mm，此时清土和摘果效果最佳，其中果实总...