除氧器液位控制及控制器输入异常影响浅析

除氧器正常运行时给蒸汽发生器提供水源,除氧器液位的稳定对保证堆芯的冷却意义重大。本文通过介绍除氧器液位控制器三冲量控制的原理,分析在液位控制器输入参数异常情况下的系统响应和应对措施。     

巧用“最小系统法”排除不能启动故障

<正>车型:捷达教学用车(出租退役车)故障现象:整车拆装实习后出现无法启动现象,偶尔能有启动迹象。诊断仪与ECU无法通讯。原因:启动电源输出电压过高(达到15.4V),导致ECU过压保护。最小系统法通常用于判断计算机故障,指的是当电脑出现故障无法确定具体部位时,采用最小系统(电源、主板、内存)启动来确定这三大部件是否正常。在最小系统正常的情况下,逐步添加各个元件(如硬     

除氧器液位波动原因分析及处理措施

除氧器正常运行时给蒸汽发生器提供水源,除氧器液位的稳定对保证堆芯的冷却具有重要的意义。本文通过介绍除氧器液位控制的原理,从理论上分析了可能导致除氧器液位异常波动的原因,并在此基础上分析了其响应的处理措施。     

海富HEUFTVX能在线检测不正确的灌装和封盖

【本刊讯】如果生产商冒着风险将液位不足的瓶子、易拉罐或者包装箱投入市场，那么他将丢失客户。这是商界公认的普遍真理。而液位过高与增加成本，因此不能被长期忽视。另外，容器中完全有可能产生过高的压力，严重的可能导致爆瓶。     

关于汽车润滑系统压力过低故障的诊断探讨

润滑系统是汽车的重要组成部分,会对汽车的正常运行及日常行驶产生重要影响。本文首先对有关润滑系统工作原理进行讲解,对润滑系统压力过低的危害进行分析,对压力过低故障进行诊断,以期对于汽车加工工艺的发展以及汽车性能的提升,起到重要的理论指导意义。     

粉碎机常见故障及处理对策分析

在饲料厂制配饲料的过程中,粉碎机直接影响着生产效率,其作用不可代替。为了保证生产的正常进行,分析出现故障的原因并掌握相对应的解决方法就变得尤为重要。粉碎机系统由粉碎机和电动机组成,因此发生的故障也应分为机械故障和电气故障两种。机械故障通常包括振动、堵塞、轴承发热、筛网破烂等;常见的电气故障有电机升温过高、电动机绕组以及控制回路的问题。     

全自动洗衣机进水量不准的处理对策

故障一:进水量未达到设定水位时就停止进水。分析与检修:此故障主要是水压开关性能不良,使集气室内空气压力尚未达到规定压力时,其触点便提前由断开状态转换为闭合状态而停止进水,具体原因和处理方法是:(1)水压开关水位控制弹簧预压缩量变小,只要旋入调节螺钉增加水位控制弹簧的预压缩量即可解决。若是水位控制弹簧弹力变小或失去弹性,则要更换水位控制弹簧。(2)水压开关凸轮上凹     

民机液压系统压力测点改装技术探讨

民机液压系统在研制取证过程中需要对系统重要的压力参数(通常包括压力脉动、压力冲击和背压等)进行测量和分析,以便确定液压系统满足合适的功能和性能设计指标。本文分析了液压压力测点改装的常用方法,从改装需求出发,到详细设计过程和方案实现,系统阐述了液压压力测点改装的关键技术和工作思路,给出了可供相似民机液压系统研制借鉴和参考的方法和流程。     

多效降膜式蒸发器蒸发温度过高的原因

牛乳是热敏性物料，蒸发器蒸发温度过高会破坏其有益元素。多效降膜式蒸发器蒸发温度过高的主要原因是：物料与热量计算不守恒；设备漏气严重；冷凝器换热面积小、冷却水量不足或冷却水温过高；冷凝器结垢严重：真空泵吸气量不足。     

浅析往复式压缩机排气温度过高的原因

往复式压缩机排气温度过高是一种常见的设备故障,造成频繁换机检修,导致设备无法长周期平稳运行。本文简要介绍了排气温度过高的危害,分析了导致排气温度过高的原因,并分析了压缩机变工况运行对排气温度的影响,提出了机组现场使用过程中应注意的一些问题。     

Heartworm in dogs in Canada in 1984

In late December 1984, 1853 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1984 and 35% of them responded. Veterinarians reported that 97,794 dogs were blood-tested to check for microfilariae and 1417 dogs (1.45% of those tested) were found with heartworm. Another 34 dogs were amicrofilaremic, but were diagnosed as having heartworm disease, to give the total number diagnosed in 1984 as 1451 (1.48%). Heartworm was reported from all provinces except Prince Edward Island and Newfoundland but most (1310) of the cases were in Ontario. In Quebec, 126 cases were reported mostly from west of Montreal.

Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 27% of the cases were observed with clinical signs of heartworm disease and 72% had a history of not having left Canada. Southwestern Ontario continued to be the primary focus of the infection.

     

Heartworm in dogs in Canada in 1983

In late December 1983, 2 800 veterinarians across Canada were sent a questionnaire in order to assess the status of heartworm disease in Canada in 1983 and 26% of them responded. Veterinarians reported that 59 504 dogs were blood-tested to check for microfilariae and 771 dogs (1.30% of those tested) were found with Dirofilaria immitis. Heartworm disease was diagnosed in all provinces except New Brunswick and Newfoundland but most (733) of the cases were in Ontario.

Heartworm disease was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 31% of the cases were observed with clinical signs of heartworm disease and 64% had a history of not having left Canada. Southwestern Ontario continues to be the focus of the infection and most of the dogs there had not left the province previously.

     

Heartworm in dogs in Canada in 1991

In late November 1991, 1883 clinics in Canada were sent a questionnaire to assess the status of Dirofilaria immitis in dogs in 1991 and there was a 60.0% response. There were 344,031 dogs tested for heart-worm (HW), 627 were found infected and the prevalence of HW infection was 0.18%. There were 417 dogs with HW in Ontario, 116 in Manitoba, 38 in Quebec, 53 in British Columbia, three in Alberta, and one in Nova Scotia. In British Columbia, all of the infected dogs but one were from the Okanagan valley which, as from 1991, is a new focus of infection in Canada. Most dogs with HW had not been on preventive medication in 1990, and the prevalence among dogs tested and unprotected was 0.59%. That prevalence was considerably higher in endemic areas. Companion dogs, over three years of age and maintained primarily outdoors in rural areas, were most frequently infected. One cat was diagnosed with D. immitis and 33 dogs had Dipetalonema reconditium.     

Heartworm in dogs in Canada in 1985

In late December 1985, 1485 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1985 and 44% of them responded. Veterinarians reported that 137,300 dogs were blood-tested to check for microfilariae and 1210 dogs were found with heartworm. Another 36 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number diagnosed in 1985 as 1247 (0.91%).

Heartworm was reported from all provinces except Prince Edward Island, Newfoundland and Saskatchewan but most (1126) of the cases were in Ontario. Southwestern Ontario continued to be the primary focus of the infection in Canada. From Quebec, 91 cases were reported mostly from and around Montreal. From Manitoba, 19 cases were reported from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 28% of the cases were observed with clinical signs of heartworm disease and 78% had a history of not having left Canada.

     

Heartworm in dogs in Canada in 1988

In late November 1988, 1581 small and mixed animal clinics and institutional veterinarians across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1988, and 46% of them responded. Veterinarians reported that 181,577 dogs were blood-tested for heartworm disease and 367 dogs were found with D. immitis microfilariae. Another 60 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1988 as 441 (0.24%).     

Heartworm in dogs in Canada in 1989

In late November 1989, 1732 clinics and institutional veterinarians were sent a questionnaire to assess the status of Dirofilaria immitis, and 51.7% responded. Of 247,716 dogs tested, 394 had D. immitis microfilariae and 51 were amicrofilaremic for a total of 445 cases and heartworm prevalence of 0.17%. Most (408) of these dogs had no preventive medication and the prevalence among dogs tested and unprotected was 1.01%. That prevalence was considerably higher in endemic areas. Thirty-seven dogs with heartworm had preventive medication. Heartworm was most frequent in companion dogs over three years of age maintained outdoors in rural areas. About 75% of the cases had never left Canada, 26% had clinical signs and 125 were not treated.

Heartworm was reported from British Columbia, Manitoba, Ontario, Quebec, Nova Scotia and Newfoundland, but 383 cases were in Ontario. South-western Ontario was the primary focus of infection. There were 33 cases in Quebec and 24 in Manitoba, mainly found in and around Metropolitan Montreal and Winnipeg respectively.

     

Heartworm in dogs in Canada in 1987

In late November 1987, 1246 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1987, and 50% of them responded. Veterinarians reported that 165,428 dogs were blood tested for heartworm disease and 511 dogs were found with D. immitis microfilariae. Another 78 dogs were amicrofilaremic but diagnosed with heartworm disease to give the total number of cases diagnosed in 1987 as 589 (0.35%).     

Heartworm in dogs in Canada in 1986

In late December 1986, 1224 institutional veterinarians and small and mixed animal clinics across Canada were sent a questionnaire in order to assess the status of Dirofilaria immitis in Canada in 1986; 46% of them responded. Veterinarians reported that 150,989 dogs were blood-tested for microfilariae and 869 dogs were found with heartworm. Another 65 dogs were amicrofilaremic but diagnosed with heartworm disease and one was found with heartworm at necropsy to give the total number diagnosed in 1986 as 935 (0.62%).

Heartworm was reported from Manitoba, New Brunswick, Ontario and Quebec, but most (810) of the cases were from Ontario. South-western Ontario continued to be the primary focus of the infection in Canada. There were 103 cases reported from Quebec, mostly from and around Montreal, and 21 cases from Manitoba, from Winnipeg and surrounding areas. Heartworm was found most frequently in companion dogs over three years of age maintained mainly outdoors in rural areas. About 33% of the cases were observed with clinical signs of heartworm disease and 81% had a history of not having left Canada.