金刚石刀具在木材加工中的应用   总被引：2，自引：0，他引：2  

曹平祥 《木材工业》2003,17(5):14-16,28

本文概述了金刚石复合刀片的发展、种类和性能，详细介绍了金刚石刀具在木材加工中的应用，如裁板锯的金刚石圈锯片、双端铣用粉碎刀、封边机用修圈刀，及在强化木地板加工中的应用。  相似文献   

Comparison of two cleaning and sterilization protocols of diamond burr tips used in debridement for canine superficial chronic corneal epithelial defects     

Kayla C. Banks  David E. Stalla  Filiz E. Bunyak  Tommi A. White  Loren G. Schultz  Elizabeth A. Giuliano 《Veterinary ophthalmology》2019,22(5):614-622

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珠三角九市都市农业产业竞争力评价     

杨震宇  马力  梁俊芬  方伟  洪少朋  林伟君 《热带作物学报》2015,(506):27-29

为衡量珠三角地区都市型农业的发展水平与竞争力，构建了珠三角都市农业产业竞争力指标体系，采用选择灰色关联度分析法，对珠三角9个城市的都市农业产业竞争力问题进行定量比较分析。研究结果表明：珠三角九市的都市农业竞争力由大到小依次为：佛山＞深圳＞珠海＞江门＞肇庆＞东莞＞深圳＞中山＞广州，各个指标中关联度最大的是相关与支持行业。从总体竞争力水平看，佛山、惠州和珠海在珠三角地区的排名靠前，说明这几个市的都市农业产业竞争力处于中上游水平，总体竞争力较强。  相似文献   

东北垄作区耦合仿生镇压轮设计与试验     

毕世英  刘伟达  郭丽君 《农机化研究》2021,(4):134-140

针对东北垄作地区春播时风大、雨少、温度高等造成的土壤水分蒸发快、缺苗严重等现象,借鉴现有镇压方式对种子周围土壤的压实研究,以蜗牛和扇贝触土外凸曲面为仿生对象,设计了耦合仿生镇压轮。耦合仿生镇压轮可以从两侧挤压土壤,使湿润的土壤压缩,保持土壤含水率和土壤温度,促进种子生长。采用耦合仿生方法,提取了蜗牛触土横面外凸曲线与扇贝纵向横面外凸曲线,在AutoCAD中对曲面逆向重构,获得轮子表面的凸包体,并遵循横向受力均匀和径向等间隔的原则,将凸包体排列在镇压轮表面,设计了耦合仿生镇压轮。离散元仿真试验结果表明:耦合仿生镇压轮作业时无明显壅土现象,耕作阻力较传统刚性镇压轮降低了8.7%。田间试验结果表明:相比于传统刚性镇压轮,耦合仿生镇压轮作业后平均土壤硬度增加17.7%,土壤含水率增加15.15%,土壤温度升高15.4%,出苗率提高2.9%,出苗时间平均缩短1.68天,耦合仿生镇压轮结构合理,作业性能优良。  相似文献   

生物基单宁树脂砂轮切割片的制备     

刘博文  周照玲  周云霞  张俊  陈谦  周晓剑  杜官本 《西北林学院学报》2021,36(6):230-236

用三乙氧基硅烷和丙烯酸正丁酯与缩合单宁和糠醇共缩聚制备一款高硬度、抗压、切割性好的热固性树脂基砂轮切割片来替代酚醛树脂砂轮切割片。通过扫描电子显微镜（SEM）对切割片的外观进行分析，通过万能力学试验机和电动角磨机对砂轮片的硬度、压缩强度和切割性能进行综合评价，采用电喷雾质谱（ESI-MS）对其结构进行定性分析。结果表明，在酸性条件下，三乙氧基硅烷和丙烯酸正丁酯与单宁和糠醇发生了不同程度的共缩聚反应，所制备的砂轮片表面平滑、孔隙少，固化后砂轮切割片的硬度和抗压强度值分别达到了13.56 daN·mm^-2和159 MPa，且具有较好的切割性能，切割金属5 s后的质量损失低于自制酚醛树脂基砂轮片。  相似文献   

基于虚拟样机技术的林用单轨车仿真研究     

王文君  姚立红  刘凯 《林业机械与木工设备》2012,(6):24-26

针对林地货物运输困难等问题,设计制造了区别于传统运输方式的林用单轨运输车。利用ADAMS与ANSYS数据接口实现虚拟设计,通过对简化模型的仿真研究得到单轨车部分构件的运动学与动力学性能参数,仿真结果表明这些性能参数达到了机构及功能的设计要求。  相似文献   

‘Eating Quality’ of Fish—A Review     

《Journal Of Aquatic Food Product Technology》2013,22(3-4):125-141

Abstract

The quality of fish is a very complex concept. Quality is frequently described using terms related to nutritional, microbiological, biochemical and physiochemical characteristics alone, but none of these terms serve as adequate indices of quality-sensory perception and consumer acceptability must be included. This paper discusses some of the sensory methods that can be used for fish as objective markers of quality in the chain from catch to consumer with focus on methods used for evaluation of whole raw fish and suggest methods and systems that can build a bridge between research and development, industry, marketing and consumer.  相似文献   

Theoretical Approach of Influence of Ion Bombardment on Forming Energy of Diamond Nucleus     

XU Xing zi  LIU Tian mo  WANG Bi ben 《保鲜与加工》2001,(5):107-110

Diamond nucleation is the key of synthesizing diamond films. At present, the negative bias is the most effective method of enhancing diamond nucleation. In this work, the forming energy is emphatically calculated that a diamond nucleus is built up on a micro defect (pit) produced on the substrate surface by ion bombardment in the process of negative bias enhanced diamond nucleation. The analytic function between nucleation energy of diamond, nucleation density, nucleation speed and pit density is given in some reasonable formulas. The results indicate that descent of the nucleation energy of diamond with the pit density resulted in enhancement of nucleation density and nucleation speed, and the results are in agreement with experimental results in conferences. The reason of the pit reduced the nucleation energy is analyzed.  相似文献   

Optimization of Structure Parameters in Ultra-precision Plane Honing     

GUO Yin biao  HUANG Yuan qing  LIANG Xi chang 《保鲜与加工》2002,(2):8

The structure parameters of honing wheel have effects on machining accuracy in ultra-precision plane honing. This paper put forward to the optimization of structure parameters. By calculating the machining accuracy coefficient and wear coefficient of triangle radial structure honing wheels, it is obvious that the suitable triangle radial structure honing wheel can improve machining accuracy of workpiece.  相似文献   

Jet with Diamond Port and Interaction Shock Structure in a Supersonic Flow     

FAN Huai-guo 《保鲜与加工》2004,(9):115-118128

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