共查询到20条相似文献，搜索用时 93 毫秒
1.
本文以汽车发动机润滑油作为研究目标,通过分析车用发动机润滑油的选择和使用过程,探讨了在环保理念的指导下车用发动机润滑油的使用措施。 相似文献
2.
1车用润滑油的作用对于发动机来说,润滑油就象血液一样重要,它具有以下几个主要作用:1.1润滑提高发动机的燃烧效率,改变发动机燃油经济性,为发动机提供磨损保护,减小发动机的磨损,延长使用寿命。 相似文献
3.
分析了车用发动机燃油消耗率随转速和负荷变化的特征；给出了无发动机万有特性曲线状况下的燃油消耗率计算模型；提出了一种简单、有效的预测车辆燃油经济性的分析方法。 相似文献
4.
为了提高车用发动机运行过程经济性,采用编写的通信类在Visual C 中开发了串行通信程序,并与ODBC技术相结合,开发了车用发动机热工状况在线监测系统,动态显示测点的温度、压力等参数.实验结果表明,该系统能较好地实现车用发动机热工状况主要特征参数的采集、查询、异常报警、历史趋势图和热效率显示. 相似文献
5.
6.
为什么说使用点燃式汽油发动机的车辆和机械都可以使用车用乙醇汽油？
答：E10车用乙醇汽油的使用性能优于无铅汽油，国家试验和国内外实践证明，使用乙醇含量为10％以下的车用乙醇汽油．无论是电喷或化油器发动机的车辆和机械，无需进行任何改动，都可以使用，且性能相当，并有所改进。 相似文献
7.
以某型车用发动机为研究对象,基于发动机仿真软件Gt-Suite建立了发动机工作过程及其冷却系统全耦合数值仿真模型,利用台架热平衡试验对该型发动机在外特性工况点下的功率、燃油消耗率和本体传热量进行了验证,结果表明该仿真模型具有良好的计算精度.通过改变模型环境边界条件,计算并分析了大气压力变化对该型发动机在最大扭矩工况和额定工况下本体传热量的影响.该研究可为提高车用发动机高原环境适应性及其技术改进研究提供理论依据. 相似文献
8.
通过分别称量在酸性废齿轮油环境下汽车用原位VCp/Fe复合材料和45钢的质量,并分别观察其形态对比分析研究其耐腐蚀性。试验表明,在发动机正常工作温度(80℃-95℃)的变质酸性润滑油介质中,车用VCp/Fe复合材料作为发动机材料比45钢具有更好的耐腐蚀性能。 相似文献
9.
10.
发动机冷却液俗称"防冻液",是车用发动机正常运转不可缺少的散热介质,直接影响其使用寿命.最初在各种车用发动机冷却系统使用酒精等溶液,其目的就是为了防冻.由此在人们心中建立了一个约定俗成的观念,认为车用防冻液的作用仅仅是防冻,只有在冬季使用,这个概念是不正确的. 相似文献
11.
Overland water and salt flows in a set of rice paddies 总被引：1，自引：0，他引：1
E. Playn O. Prez-Coveta A. Martínez-Cob J. Herrero P. García-Navarro B. Latorre P. Brufau J. Garcs 《Agricultural Water Management》2008,95(6):645-658
Cultivation of paddy rice in semiarid areas of the world faces problems related to water scarcity. This paper aims at characterizing water use in a set of paddies located in the central Ebro basin of Spain using experimentation and computer simulation. A commercial field with six interconnected paddies, with a total area of 5.31 ha, was instrumented to measure discharge and water quality at the inflow and at the runoff outlet. The soil was classified as a Typic Calcixerept, and was characterized by a mild salinity (2.5 dS m−1) and an infiltration rate of 5.8 mm day−1. The evolution of flow depth at all paddies was recorded. Data from the 2002 rice-growing season was elaborated using a mass balance approach to estimate the infiltration rate and the evolution of discharge between paddies. Seasonal crop evapotranspiration, estimated with the surface renewal method, was 731 mm (5.1 mm day−1), very similar to that of other summer cereals grown in the area, like corn. The irrigation input was 1874 mm, deep percolation was 830 mm and surface runoff was 372 mm. Irrigation efficiency was estimated as 41%. The quality of surface runoff water was slightly degraded due to evapoconcentration and to the contact with the soil. During the period 2001–2003, the electrical conductivity of surface runoff water was 54% higher than that of irrigation water. However, the runoff water was suitable for irrigation. A mechanistic mass balance model of inter-paddy water flow permitted to conclude that improvements in irrigation efficiency cannot be easily obtained in the experimental conditions. Since deep percolation losses more than double surface runoff losses, a reduction in irrigation discharge would not have much room for efficiency improvement. Simulations also showed that rice irrigation performance was not negatively affected by the fluctuating inflow hydrograph. These hydrographs are typical of turnouts located at the tail end of tertiary irrigation ditches. In fact, these are the sites where rice has been historically cultivated in the study area, since local soils are often saline-sodic and can only grow paddy rice taking advantage of the low salinity of the irrigation water. The low infiltration rate characteristic of these saline-sodic soils (an experimental value of 3.2 mm day−1 was obtained) combined with a reduced irrigation discharge resulted in a simulated irrigation efficiency of 60%. Paddy rice irrigation efficiency can attain reasonable values in the local saline-sodic soils, where the infiltration rate is clearly smaller than the average daily rice evapotranspiration. 相似文献
12.
13.
赵国杰 《农业机械化与电气化》2011,(4):106-107
乡（镇）农技推广体系是农业发展的关键。介绍朝阳市农业技术推广体系的现状,针对目前体制及运行机制、服务手段等方面存在的问题,提出适合朝阳市乡（镇）农技推广体系改革与发展的对策,以期对全省农技推广体系改革和发展起到一些借鉴作用。 相似文献
14.
苑庆刚 《农业机械化与电气化》2010,(3):52-54
草莓果味酸甜爽口,营养价值高,为人们所喜爱的应市鲜果之一。由于草莓易受损伤和微生物侵染,因此其采收、贮藏过程极为重要。介绍草莓采收过程中的注意事项以及11种贮藏保鲜技术的实施步骤和操作方法,推介9种加工方式,为草莓产业化提供技术支持。 相似文献
15.
瓦房店市是我国重要的水果生产基地,在国内水果生产领域占有重要地位。随着水果市场化的不断深入,如何满足和适应国内外市场需求成为瓦房店市水果生产的关键问题。从瓦房店市水果生产实际出发,阐述了实施水果生产标准化的必要性,提出了发展水果生产标准化的具体措施。 相似文献
16.
对引进的谷子新品种金谷子耐旱TG118进行品种比较试验和多点试种。结果表明：该品种抗旱、耐瘠、适应性强,稳产、高产、抗病抗风抗倒伏强,品质优良,粮草兼用,种植简单,省工易管;一般产量在6000kg/hm2以上,比当地主栽品种增产20%以上。最高产量达9450kg/hm2,适于在辽西北地区推广应用。 相似文献
17.
对《种子法》存在问题的探讨 总被引：1，自引：0，他引：1
李鹏 《农业机械化与电气化》2011,(6):129-130
《种子法》是我国种植业第一部法律。自实施以来,为依法加强种子管理提供了有力的法律支撑,促进我国种子产业发生翻天覆地的变化。但随着依法管理工作的深入和种子产业的快速发展,《种子法》及配套规章的一些问题逐步显现出来。对《种子法》及配套规章存在的问题进行深入分析,对需要进一步补充的章节以及需要调整的内容进行深入探讨,以求更加完善和明确。 相似文献
18.
在新世纪,面对机遇和挑战,党的十六大把“社会更加和谐”作为全面建设更高水平的小康社会的一个重要目标。中国人素有社会和谐的理想;西方人自古也向往社会和谐;借鉴东西方两种和谐社会思想的经验、教训,构建社会主义和谐社会理论。 相似文献
19.
About 30 years have passed since the Government of Egypt embarked on implementing a series of large scale drainage projects. At present, about 3.8 million acres have been provided with drainage systems on the basis of systematic pre-drainage investigations and designs. The target is to provide drains in approximately 6.4 million acres in the Nile Valley and Delta.The implementation of the subsurface drainage system is carried out by the public sector and private contractors under direct supervision of governmental regional departments. The implementation process depends on many factors related to the drainage material, machinery, manpower, site requirements, farmers and organizations involved. Problems and constraints are sometimes challenging, however, the annual rate of implementation has gradually increased to 170,000 acre/year.This paper discusses the different aspects involved in the implementation process of drainage systems. The development in materials, machinery and construction technologies will be reviewed. Institutional and management factors are going to be also considered. 相似文献
20.
M. G. Bos H. van den Bosch H. Diemont H. van Keulen J. Lahr G. Meijerink A. Verhagen 《Irrigation and Drainage Systems》2007,21(1):1-15
The rural sustainability index is a scientifically based tool to quantify the performance of agriculture. The sustainability
of crop production is quantified from three perspectives; people, planet and profit. Within each perspective, one condition
was selected that must be met to warrant agriculture. These are: No hazardous work should be used within the crop production
chain; agricultural crops should not be grown on land allocated to nature by national law or regulations and, when a GM-crop
is present or is introduced in a region, it should not harm development opportunities of other farmers. If these excluding
conditions are met, the sustainability of agriculture is assessed through five performance indicators on school attendance,
water use and consumption, fertilizer use, pesticide use, and farm income. For each of the five indicators, critical values
and target values have been given that limit the transition range between non-sustainable and sustainable production. The
five indicators are combined into a sustainability index. The index aims at improving the socio-economic position of farmers
while protecting the environment.
相似文献
| M. G. BosEmail: |