翻转犁限位块形状的反求分析与设计

以JD型液压翻转犁为模型机 ,运用反求工程技术 ,对其限深轮换位机构的限位块进行反求分析和研究 ,建立了其结构形状优化设计的数学模型 ,为零件的形状优化提供了一种新的思路和方法。同时将反求结果用于1LF— 335液压翻转犁 ,该犁已投入批量生产 ,限位块工作性能良好。     

立体分子伴侣-脂肪酶特异折叠酶

细菌脂肪酶是一类重要的工业用酶,尤其以来源于假单孢杆菌Pseudomonas与伯克霍尔德菌Burkholderia的脂肪酶应用最为广泛。然而,这类脂肪酶折叠过程中存在一个巨大的能障而无法自发正确折叠。研究发现,这类脂肪酶的编码基因所在操纵子中往往存在一个与其折叠相关的基因,编码一种脂肪酶特异折叠酶。该类蛋白为脂肪酶的立体分子伴侣,可与脂肪酶的折叠中间体相互作用,帮助脂肪酶越过折叠过程中的能量障碍,为其获得正确构象提供必要的空间信息。详细阐述了脂肪酶特异折叠酶的发现、分类、作用机制与应用前景。     

汽车电工电子技术课程的教学改革研究

作为汽车专业的一门专业基础课,汽车电工电子技术是后续汽车类专业课程的理论基础.文章通过分析该课程的主要特点,以及传统教学方法存在的不足,主要从课程内容的整合、教学方式的改变、考核制度的完善等方面实施教学改革,课堂教学实践表明该教学改革能够取得良好教学效果.     

Optimal preventive maintenance interval period of CNC

On the basis of failure data gathered from 5 NC machine tools of one type in one year,a two-parameter Weibull distribution model is established,and this model has passed linear correlation test and hypothesis testing. On the principle of the most effectiveness,the best preventive maintenance intervals model on the state of reparative maintenance is brought forward,and the best preventive maintenance intervals of this type have been calculated. In the end,an appropriate maintenance plan is brought forward according to the best preventive maintenance intervals,and the maintenance cost is greatly reduced and the availability of this type of NC machine tool are kept at the same time.     

Removal of Dmethyl Phthalate from Water with Enhanced Coagulation Technology

The removal of Phthalate Esters (PAEs) from water was measured by using enhanced coagulation technology.Cationic coagulant poly-diallyl-dimethyl-ammonium-chloride (PDMDAAC) and polyacrylamide (CPAM) were employed to remove the dimethyl phthalate (DMP),and the residual concentration of DMP is determined by the high performance liquid chromatography (HPLC).During the coagulation/flocculation process,parameters such as coagulant dosage,pH value,and sedimentation time are investigated.The results show the use of coagulant PDMDAAC/CPAM together has better coagulation effect than PDMDAAC.DMP removal rate is 99.87% when initial DMP concentration is 0.50 mg/L,the addition of a PDMDAAC dosage 50 mg/L,the addition of a CPAM dosage 2.5 mg/L,pH value 6.0 and sedimentation time 3 hours.Therefore,the removal of PAEs by coagulation is effective,and the application of coagulation by PDMDAAC/CPAM in water supply will enhance the removal of PAEs and at the same time reduce the water turbidity.     

番茄果实不同发育期种子生活力研究

根据四唑(2,3,5-Tripheny Tetrazolium Chloride,TTC)染色法测定种子生活力的原理,结合种子萌发试验,研究普通番茄果实不同发育期种子的生活力。结果表明,TTC染色法最优条件为:30 ℃条件下1.0% TTC染色24 h;番茄种子在果实绿熟期(MG)前4 d开始具有生活力;在转色期(LR,59 d)具有较高的生活力,同时种子千粒重达到成熟标准,说明转色期种子已完全成熟,可用作育种材料。     

Sludge Treatment and Application in Greening

Sludge is a very good fertilizer source and has higher value in use as nutrients for greening, whereas sludge also contains higher concentration of heavy metals, with which urban underground water would be suffered secondary pollution. A test of greening with sedium lineare and modified fly ash passivation sludge was carried out to study the impacts of different mixture ratio and dosage of modified fly ash on the plant’s growth and leachate. It was shown that 20% mixture ratio of modified fly ash was the optimum for sludge treatment and 80% of heavy metals pollution can be removed.     

德国沼肥利用的安全性与生态卫生

本文介绍德国沼肥利用安全性和生态卫生方面的研究成果、农业养殖和种植资源的利用技术,沼肥农用安全的管理制度与我国沼肥安全利用技术及法规建设的比较.     

园林绿化中的大树移栽及养护管理技术

大树移栽是园林绿化种植施工中难度较大的栽植T程,费T费时且费用也大,所以确保大树移栽成活率尤为重要.从大树移栽的基本原理、移栽前的准备工作、移栽中的技术措施以及移栽后的养护管理等方面进行探讨.以求最大限度地提高新植大树的成活率和移栽质量.     

小管出流条件下树莓耗水规律试验研究

利用防雨棚和测坑进行小管出流条件下树莓的耗水特性及土壤水分变化情况的试验研究。结果表明:树莓在现蕾—花期阶段的耗水量明显高于其他生育阶段,该阶段的耗水强度为2.43～2.80mm/d;增加开花时期的灌水量有利于作物产量的提高。