隔膜泵故障检修及分析     

黄文龙  刘业玉 《排灌机械》2006,24(2):33-34

德国ABEL公司的HMD-G-32-0250型隔膜泵是板框污泥脱水系统中的关键设备之一。针对A-BEL隔膜泵运行中频繁振动损坏的问题。运用现代控制技术分析了其主要原因是因泵转速过快造成、而转速过快又是由于PLC控制程序存在缺陷所造成的。PIE控制程序使隔膜泵压力在1．0-L3MPa时．变频器输出频率维持在40Hz的振动区域。通过修改控制程序模块，使压力在0．75-1．4MPa的区间内，变频器输出频率从80Hz线性下降到8Hz直至停止。修改后消除了泵及管道的震动，泵运行正常。  相似文献   

Factors Associated with Survival in Septicemic Foals: 65 Cases (1988–1995)     

J'mai M. Gayle  Noah D. Cohen  M. Keith Chaffin 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》1998,12(3):140-146

In order to identify variables obtained at admission that could be used to predict survival in septicemic foals, medical records of 65 foals diagnosed with septicemia were reviewed. Initially, variables were analyzed independently (univariate analysis) for association with survival. Of the physical examination and historical data examined using univariate analysis, the ability to stand at admission, respiratory rate ≥ 60 breaths per minute (bpm), and normal-appearing mucous membranes were significantly associated with survival. Foals with history of induced parturition were significantly less likely to survive. The following hematologic and serum biochemical variables determined at admission were significantly associated with survival: white blood cell count a 6,000 cells/μL, neutrophil count <4,000 cells/μL, serum albumin concentration <2.2 g/dL, serum glucose concentration <120 mg/ dL, blood pH ≥ 7.35, and positive base excess. The administration of plasma at admission was significantly associated with survival. Stepwise multiple logistic regression analysis was performed to evaluate the association between survival and variables identified as significantly associated with survival in bivariate analysis. The final multivariate model selected included the variables standing, duration of clinical signs (24-hour intervals) prior to admission, respiratory rate a 60 bpm, neutropenia (> 4,000 cells/μL), and neonatal age category. The probability of survival was significantly increased for foals that were standing, had a respiratory rate a 60 bpm, and that had a neutrophil count <4,000 cells/μL at admission. Probability of survival was significantly decreased for foals that had a longer duration of clinical signs prior to admission. For each 24 hours of duration, the estimated risk of death was increased by 5.8-fold.  相似文献   

Failure of passive transfer in foals: incidence and outcome on four studs in New South Wales     

CM TYLER-McGOWAN  JL HODGSON  DR HODGSON 《Australian veterinary journal》1997,75(1):56-59

Objective To determine the regional incidence and effectiveness of treatment of failure of passive transfer (FPT) in foals. Design A study of disease incidence. Animals Eighty-eight foals and 57 mares from four studs in the practice area of the Rural Veterinary Centre were tested. Procedure Foals were tested for their serum IgG and total serum protein (TSP) concentration within the first 72 hours of life. Colostrum was collected from mares and specific gravity determined. FPT and partial failure of passive transfer (PFPT) of immunoglobulins was diagnosed when serum IgG concentrations were < 4 g/L and 4 to 8 g/L respectively. Owners of foals diagnosed with FPT were offered treatment with 1 to 2 L plasma (TSP > 70 g/L); 9 (64%) of the affected foals were treated. Results Fourteen foals (16%) had FPT whereas 15 (17%) had PFPT. There were significant differences between the mean TSP concentration in foals with FPT (42.6 ± 4.2 g/L), PFPT (48.1 ± 3.9 g/L) and those acquiring adequate passive immunity (58.9 ± 5.5 g/L) (P < 0.01). Sixteen (29%) mares had pre-suck colostral specific gravity < 1.060 and 12 (71%) foals raised by these mares had FPT or PFPT. The incidence of severe disease (categorised by a sepsis score > 11, positive culture of bacteria from blood or disease requiring hospitalisation) in all foals in the first 2 months of life was 10%. However, none of the nine foals with FPT that received plasma experienced severe disease. In contrast, foals with PFPT had an increased susceptibility to severe disease (P < 0.001) when compared with normal foals. Conclusion Treatment of foals with FPT may reduce the subsequent incidence of severe disease. Pre-suck colostral specific gravity and foal TSP may be used to predict the likelihood of FPT and PFPT. Even though the number of foals studied is small the results highlight the importance of optimal management practices in reducing the incidence of FPT and disease associated with this process.  相似文献   

Use of Fourier‐Transform Infrared Spectroscopy to Quantify Immunoglobulin G Concentrations in Alpaca Serum     

J. Burns  S. Hou  C.B. Riley  R.A. Shaw  N. Jewett  J.T. McClure 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2014,28(2):639-645

Background

Rapid, economical, and quantitative assays for measurement of camelid serum immunoglobulin G (IgG) are limited. In camelids, failure of transfer of maternal immunoglobulins has a reported prevalence of up to 20.5%. An accurate method for quantifying serum IgG concentrations is required.

Objective

To develop an infrared spectroscopy‐based assay for measurement of alpaca serum IgG and compare its performance to the reference standard radial immunodiffusion (RID) assay.

Animals

One hundred and seventy‐five privately owned, healthy alpacas.

Methods

Eighty‐two serum samples were collected as convenience samples during routine herd visits whereas 93 samples were recruited from a separate study. Serum IgG concentrations were determined by RID assays and midinfrared spectra were collected for each sample. Fifty samples were set aside as the test set and the remaining 125 training samples were employed to build a calibration model using partial least squares (PLS) regression with Monte Carlo cross validation to determine the optimum number of PLS factors. The predictive performance of the calibration model was evaluated by the test set.

Results

Correlation coefficients for the IR‐based assay were 0.93 and 0.87, respectively, for the entire data set and test set. Sensitivity in the diagnosis of failure of transfer of passive immunity (FTPI) ([IgG] <1,000 mg/dL) was 71.4% and specificity was 100% for the IR‐based method (test set) as gauged relative to the RID reference method assay.

Conclusions and Clinical Importance

This study indicated that infrared spectroscopy, in combination with chemometrics, is an effective method for measurement of IgG in alpaca serum.  相似文献   

恒温恒湿检定系统日常维护与故障分析     

张佳佳  封皖 《安徽农业科学》2014,(30):10487-10488

简述了伟思富奇恒温恒湿箱以及与之配套使用的神荣露点仪日常维护与保养的注意事项,指出以预防故障为前提的日常维护工作的必要性.分析了设备可能出现的故障情况,并列举排除故障的方法和维修措施.  相似文献   

削片机主轴的断裂与研制     

王建平  方广盛 《东北林业大学学报》1990,18(1):107-113

削片机是木材废料和林区剩余物综合利用的重要机械设备,给林区带来了显著的经济效益和社会效益。黑龙江省友好木材综合加工厂Ⅱ号削片机,使用43个月后其主轴完全破断。本文在实地调查分析的基础上,对主轴进行了受力分析和断裂失效分析,研制了新主轴。投产一年来,通过对主轴的径向跳动测试和刀盘端面跳动测试表明,新主轴较原主轴的结构合理,工作正常,给工厂带来了较大的经济效益。  相似文献   

高龄大熊猫多器官衰竭的病理学观察     

郭定宗  周诗其  李家奎  胡薛英  杨世锦  汪民权  杜有顺  余汉成 《畜牧兽医学报》2002,33(3):295-298

本文观察了1只38岁高龄的大熊猫多器官衰竭的病理学变化。病理剖检显示，该熊猫主要表现为实质器官充血、水肿和出血性变化；组织病理学检查发现，全身实质器官（除心、肺、脑外）均发生明显萎缩，胃、肠、肝、胰、肾等发生水肿变性或出血；此外，还观察到心肌纤维坏死后的瘢痕形成。结果表明，老龄大熊猫的多器官衰竭的病理学变化与其他动物相似；高龄大熊猫也易患心血管系统疾病，且具有较经的组织修复能力。  相似文献   

A Method of Modelling Pig Breeding Schemes     

Dan Olsen  Erling Sehested 《Acta Agriculturae Scandinavica, Section A - Animal Sciences》2013,63(1):1-11

Optimal use of limited resources as nucleus and testing capacity is important when organizing crossbreeding schemes in pigs. This paper introduces a method of modelling pig crossbreeding schemes consisting of nucleus, multiplier and commercial tiers. As an efficient alternative to the gene flow method (Hill, W.G. 1974. Anim. Prod. 18, 117-139), lag, original genetic level and annual genetic improvement for each line and cross are combined into one single evaluation criterion, the average discounted revenues of the breeding scheme. An optimum allocation of nucleus and testing capacity within breeding schemes, as well as an optimum solution between schemes can be found. As an example, the optimization of a four-way crossbreeding scheme is shown. the optimum allocation of nucleus capacity was 35% and 15% in each dam line and sire line, respectively. The corresponding figures for testing capacity were 23% and 27%.  相似文献   

农用运输车可靠性分析评价研究     

郑殿旺  高德  鲁立刚  王耀斌 《农业机械学报》1999,30(1):89-92

以ＹＬ２２０８ＣＷ型四轮农用运输车可靠性试验为依据,参照有关的国家和前机械工业部标准,对该车可靠性进行了分析,计算和评价,并开发了农用运输车可靠性评价计算机系统,提出了提高和改进其可靠性的途径。  相似文献   

毛竹/杉木层积复合材弯曲与剪切破坏的微观形变过程   总被引：1，自引：0，他引：1  

王戈  江泽慧  于文吉 《东北林业大学学报》2008,36(2):27-29

利用扫描电镜在位拉伸方法(ISL-SEM),研究了毛竹/杉木层积复合材在受到外力作用下3点弯曲和剪切破坏的微观形变过程;结合扫描电镜所观测的形貌图,分析了该情况下层积材的典型破坏规律;总结了气干和水湿处理后,竹杉层积复合材剪切破坏模式以及气干条件下弯曲破坏模式。  相似文献