在水泵制造企业中应用成组技术

通过水泵生产企业现状的调查分析，在为某水泵厂开发计算机辅助企业现代化管理系统的基础上，提出了水泵生产企业运用成组技术，强化企业内部管理的内容和方法。     

电动助力转向系统直流伺服技术的研究

针对电动转向系统原有单一控制方式的不足，根据直流脉宽调制伺服系统工作原理，提出了一种带有助力和阻尼两种模式的综合控制方式。通过对两种模式分别进行分析计算，提出了一种针对占空比和控制模式的修正方法。台架性能试验验证表明，采用这种伺服控制方式，电动助力转向系统快速回正时的平稳性有所提高。     

基于Pro/E Wildfire的水泵叶轮精确建模

基于传统的叶片加工方式，从现有的二维水力木模图的型值点出发，基于Pro／E Wildfire软件，采用从点到线、从线到曲面、再从曲面到实体的方法，实现了泵叶轮空间扭曲叶片和圆柱形叶片的三维实体造型，利用制造模具的常用方法实现了泵叶轮和流道的造型，造型方法精确，为后续的流场数值模拟和数控加工奠定了基础。     

基于组件技术的开放式数控系统体系结构

为实现开放式数控系统的可移植性、可扩展性及可互换性等特性,引进软件工程学思想,提出了基于组件技术的开放式数控系统体系结构。阐述了组件技术的原理及实现技术。软件设计采用双层面设计方式,利用CORBA组件模型并使用星式通讯机制,建立各组件之间的组成及通讯方式。以自主研发的混联式虚拟轴研抛机床为平台,进行了三维曲线加工轨迹仿真实验,表明基于该体系结构的数控系统具有良好的开放性及动态性能。     

In vitro ruminal fermentation parameters and methane production of Marandu palisadegrass (Urochloa brizantha) in a silvopastoral system associated with levels of protein supplementation

The addition of protein supplementation in a silvopastoral system can contribute to improved forage intake and digestibility. Our objective was to evaluate in vitro ruminal parameters, digestibility and gas production of Marandu palisadegrass [Urochloa brizantha (Hochst. ex A. Rich.) R. D. Webster] in a silvopastoral system and compare this to parameters obtained from diets with protein supplementation. Forage was sampled during the growing season (November to April) in 2016/17 and 2017/18. In vitro incubation treatments consisted of four levels of protein supplement (20% of crude protein; CP) in the diet (0.1, 0.2, 0.3 and 0.4 g/kg of body weight). The neutral detergent fibre, acid detergent fibre and indigestible neutral detergent fibre concentrations were highest in the first year. In the second year, CP concentration was 21% greater than in the first year. There was a linear increase for digestion rate, a quadratic effect for lag time and a linear decrease for average digestion time as supplementation levels were increased. The least lag time and digestion time occurred in the second year. There was no supplementation effect on ruminal pH, acetate and butyrate concentrations. Second-year in vitro dry matter digestibility (IVDMD) was greater than in the first year. Increases in supplementation levels linearly enhanced IVDMD and reduced methane (CH₄) production. The inclusion of a protein supplement contributed to reduced CH₄ and increased volatile fatty acids production; therefore, we recommended the supplement inclusion of >0.28 g/kg of BW for animals grazing in well-managed palisadegrass pastures.     

Comparison of Chemical Composition and Biological Properties of Essential Oils Obtained by Hydrodistillation and Steam Distillation of Laurus nobilis L.

Plant Foods for Human Nutrition - The purpose of this study was to compare the yield, chemical composition, antimicrobial and antioxidant properties of essential oils isolated from leaves of Laurus...     

Biological Activities of Chickpea in Human Health (Cicer arietinum L.). A Review

Plant Foods for Human Nutrition - Chickpea is one of the most consumed legumes worldwide. Among their benefits are the high protein concentration that reflects not only at the nutritional level but...     

Sorghum Pasta and Noodles: Technological and Nutritional Aspects

Plant Foods for Human Nutrition - Sorghum is a major cereal crop with various agronomic advantages, contains health-promoting compounds and is gluten-free. There is a growing tendency to use...