液压机系统应用研究

以液压压力机的电气、液压联合控制系统设计为出发点深入对液压系统进行设计。液压系统的原理设计,从工况分析到拟定原理图再到压力机电气原理控制图,让读者清晰的认识到液压系统的设计步骤。对该液压压力机缸的设计与计算。并且对液压系统的计算和液压元件的选择,设计到计算再到液压元件的选择,对液压系统进行深入的分析,并验证系统的可靠性。     

斗轮堆取料机驱动液压系统设计

本文主要说明斗轮堆取料机斗轮驱动液压系统的设计,斗轮堆取料机斗轮驱动液压系统和斗轮驱动补油系统,以及该液压系统的主要参数的计算,液压系统原理图的拟定,液压泵、液压阀、液压马达和其它辅助装置等液压元件的选择。     

用于纺织机械设计的液压传动CAD系统

在AutoCAD平台环境下,开发了液压传动计算机辅助设计系统。提出了新的液压传动设计思想和方法,实现了液压传动设计的高效、高质及现代化。液压传动CAD系统用于纺织机械设计,包含了流体静力学计算、流体动力学计算、液压元件计算、液压元件查询、液压系统图绘制等功能,提高了纺织机械中液压设计的效率和设计质量,可为纺织机械企业带来极大的便利和经济效益。     

液压支架用高含水液压液的分析与应用

文章主要分析液压支架液压用高含水液压液,从其配制水质要求、原液选型及高含水液压液试验对比分析,液压支架用高含水液压液运行维护等方面分析,提升液压支架液压系统可靠性。     

常见液压现象与液压阀故障的探讨

在液压系统中使用最为广泛的一个元件就是液压阀,液压阀通过对液压系统中液体的流向、压力、流量等进行控制,实现液压系统工作的。但是在液压系统实际工作中,会出现一些故障影响液压系统的正常工作和运行,为此文章针对液压系统常见的液压现象以及液压阀常见故障进行分析研究,然后提出相关的解决对策。     

机床液压系统清洗方法的研究

液压油污染是导致数控机床液压系统故障的主要原因。大部分的液压系统故障是由液压油污染造成的,这不仅大大影响设备的工作性能,而且会带来较大的经济损失。由于液压系统在装配过程中必然会形成污染物,因此对液压系统在总装后进行冲洗是非常必要的。     

液压机系统应用研究

以液压压力机的电气、液压联合控制系统设计为出发点深入对液压系统进行设计。液压系统的原理设计,从工况分析到拟定原理图再到压力机电气原理控制图,让读者清晰的认识到液压系统的设计步骤。对该液压压力机缸的设计与计算。并且对液压系统的计算和液压元件的选择,设计到计算再到液压元件的选择,对液压系统进行深入的分析,并验证系统的可靠性。     

浅析装载机液压系统泄漏及防治

本文主要研究装载机液压系统的泄漏问题,针对装载机液压系统泄漏的主要影响因素进行分析,并提出装载机液压系统泄漏的简单防治措施,以促进液压系统工作安全性的改善,从而提高装载机液压系统的工作可靠性和使用寿命。     

试论混凝土搅拌机液压系统的维护及常见故障

目前,我国液压技术和液压元件的质量不断提高,混凝土搅拌机中液压系统的应用越来越普遍。不过在实际应用中,假如维护不当,混凝土搅拌机液压系统很容易出现故障,导致机械无法正常工作。一些修理人员或者操作工不熟悉液压系统的工作原理和构造,在液压系统出现故障时不能迅速查到故障原因并予以维修,这也制约了混凝土搅拌机中液压系统的使用。     

船舶液压甲板机械的常见故障及维护措施研究

随着液压技术水平的提升,液压机械设备广泛应用于船舶甲板中,有效提升了甲板机械的运行性能。如果液压甲板机械发生故障,不仅会影响到船舶航行的安全性和稳定性,同时还可能造成海水污染,所以要做好液压甲板机械的日常维护。文章首先阐述了船舶液压甲板机械的常见故障,然后对液压甲板机械的维护措施进行分析,为延长液压设备的使用寿命以及提高船舶运行的安全性和稳定性提供参考。     

Technical note: A simple rumen collection device for calves: An adaptation of a manual rumen drenching system

A limited amount of research is available related to the rumen microbiota of calves, yet there has been a recent spike of interest in determining the diversity and development of calf rumen microbial populations. To study the microbial populations of a calf's rumen, a sample of the rumen fluid is needed. One way to take a rumen fluid sample from a calf is by fistulating the animal. This method requires surgery and can be very stressful on a young animal that is trying to adapt to a new environment and has a depressed immune system. Another method that can be used instead of fistulation surgery is a rumen pump. This method requires a tube to be inserted into the rumen through the calf's esophagus. Once inside the rumen, fluid can be pumped out and collected in a few minutes. This method is quick, inexpensive, and does not cause significant stress on the animal. This technical note presents the materials and methodology used to convert a drenching system into a rumen pump and its respective utilization in 2 experiments using dairy bull calves.     

Molecular and immunological characterization of Mus a 5 allergen from banana fruit

Scope Banana fruit has become an important cause of fruit allergy in the recent years. Among the five registered IUIS allergens, Mus a 1 and Mus a 2 have been characterized in detail. In this study, molecular characterization and evaluation of the allergenic properties of β‐1,3‐glucanase from banana (Musa acuminata), denoted as Mus a 5, were performed Methods and results The gene of Mus a 5 was cloned and sequenced. The obtained cDNA revealed a novel Mus a 5 isoform with an open reading frame encoding a protein of 340 amino acids comprising a putative signal peptide of 28 amino acid residues. By MALDI‐TOF analysis Mus a 5 isolated from banana fruit revealed a molecular mass of 33451±67 Da. Two Mus a 5 isoforms (pI 7.7 and 8.0) were detected by 2D immunoblot with an identical N‐terminal sequence. By mass fingerprint, 76 and 83% of the primary structure was confirmed for the two mature Mus a 5 isoforms, respectively. IgE reactivity to Mus a 5 was found in 74% of patients sensitized to banana fruit. Upregulation of basophil activation markers CD63 and CD203c was achieved with Mus a 5 in a concentration‐dependent manner Conclusion Mus a 5 is a functional allergen and a candidate for the component‐resolved allergy diagnosis of banana allergy.     

The Effect of Additives on the Regain of Wool

The changes in pressure, velocity, and energy of a liquid particle emanating from a submerged jet and flowing towards and through a porous medium are predicted. An expression is developed for the volumetric rate of flow of a liquid from a jet entering a porous medium, and the rate is shown to vary less than 20% when the distance from the jet nozzle to the porous medium is doubled. The pressure at any level in a compressible porous medium subjected to an initial uniform flow is determined. The distribution of flow within a layer of wool that is impinged upon by a submerged jet is found to be Gaussian, and photographic evidence shows the spread of the flow as it emerges from the downstream surface.     

数字印刷系统中的免折页胶订技术

在数字印刷系统的配置中,在不配备折页机的情况下,要想完成单本或多本书籍和文件的成书,就需要寻找出一种特殊的排版、打印、裁切和装订工艺方法来进行处理.采用这种工艺方法,无须使用折页机,只通过切纸机的裁切和过胶装订,就能以最省纸张和最少的纸张印刷次数来完成一本书籍的印刷和装订成书.该技术是数字印刷机应用中一种全新的工艺方式.     

Cooperatives,wine clusters and territorial value: evidence from an Italian case study

The objective of the research is to investigate whether the strategic dynamics of wineries that operate in a wide homogeneous territorial system can result in a relational space and play the role of a wine cluster, and if so, how. For this purpose, a group of Italian wine cooperatives has been analysed through a framework that attempts to integrate all the most relevant quantitative and qualitative components of a local territorial system. The study has been carried out in three steps: identifying the elements of the wine cluster, bringing each element into a specific matrix of analysis and recreating the matrices within a synthesis framework. The results show that the cluster is not identified with the wine region. Instead, it is formed through the homogeneity of the businesses' strategic orientations, which has led to a specific territorial identity.     

Analysis of rate-dependent tensile properties of polypropylene fibres used in thermally bonded nonwovens

The stress–strain behaviour of polypropylene fibres is evaluated for various tensile strain rates. Fibre samples are extracted from a thermally bonded nonwoven and fixed in a low-load tensile test machine. A methodology is introduced to implement a constant true strain rate at high strain tests for conventional tensile test machines. The obtained results indicate that polypropylene fibres show a highly viscous behaviour, especially during the initial stage of load application. No significant difference in a tensile behaviour of fibres was observed for loading regimes with a constant true strain rate and a constant engineering strain rate.     

The nucleotide sequence of a 2·1 kb fragment from chromosome VI of Saccharomyces cerevisiae identifies a tRNAGly gene,part of a delta element and a palindromic sequence

The nucleotide sequence was determined of a 2·1 kb DNA fragment located at approximately 35 kb to the right of the centromere of chromosome VI from Saccharomyces cerevisiae. Analysis revealed the presence of a tRNA^GLy gene, part of a delta element and a remarkable palindromic sequence. The longest open reading frame found encodes a putative protein of 195 amino acids. Although the fragment was isolated by hybridization to a human diacylglycerol kinase cDNA, no evidence was obtained for the presence of a gene encoding diacylglycerol kinase.     

自动式汉堡制作机设计

为了减少汉堡制作过程对人工依赖程度高的现状,设计一种自动式汉堡制作机,该自动式汉堡制作机包括机械系统和控制系统两方面。机械系统包括:烤箱、天车系统、储肉柜、机械手、托盘小车、流水线、酱枪、加菜机构;控制系统包括:触摸屏、通讯系统和PLC。控制系统控制机械系统完成加面包、加肉、加汉堡酱、加生菜、加面包5个步骤,实现制作自动化、流水线化,解放劳动力。通过试验验证了自动式汉堡制作机设计的可行性和合理性。     

三角代数上的广义高阶Jordan导子

设F=(fi)i∈N是环(R)上的一族可加映射,如果a,b ∈(R)且存在一个高阶导子D=(di)i∈N,有fn(ab)=∑fi(a)dj(b),则称F是一个广义高阶导子;如果存在一个高阶Jordan导子D=(dj)i∈N,有fn(a2)=∑i+j=n fi(a)dj(a),则称F是一个广义高阶Jordan导子.证明了...