物探电测深在低阻松散层中找水的应用

信阳制药厂水源地电测深资料的解释表明,第四系、第三系松散低阻沉积地层之间的电阻率差别较小,以单层的砂层或粘土层直接作为电性层进行测深曲线的解释是困难的。应根据工作区的水文地质特点,结合已知钻井资料,划分出含水层组—以砂石为主的层段和隔水层组—以粘土为主的层段,以此作为电性层,对电测深曲线采用计算作图法定量解释,效果较好。     

大功率激电在南京市凤凰山铜矿地质构造特征研究中的应用研究

利用大功率激电对南京市凤凰山铜矿勘查区进行电测深工作,采用等比对称四极装置进行测深工作,在勘查区内布置两条测线进行探测。对激电测深采集的数据进行分析,利用计算机软件得到视极化率反演剖面图和视电阻率反演剖面图。对图形分析认为:采用大功率激电进行勘测取得了较好的勘测结果,但实际操作过程中应考虑勘查区地形、电网的分布影响因素,对激电勘测到的异常区建议采用钻探验证。     

如何寻找新顾客

(一)分辨可能的顾客 如果你想招揽新顾客,关键在于确认潜在的顾客。这些人是:有购买意向者、有购买资金或筹措资金能力者、具有购买意思与能力者。以这些标准对购买者进行分辨,切忽把时间与精力耗费在既无购买意思,又无购买能力的顾客身上。     

浅部地下水勘查中可控源音频大地电磁测深的运用分析

随着经济的发展和社会的进步,科学技术水平不断提高,地下勘察方式不断丰富和更新.可控源音频大地电磁测深作为电磁法的一类,其利用人工场源进行测深,对剖面进行计量,依照不同地区状况和特点,估计合理的赋水点,以帮助勘查工作有参考数据,且应用广泛到山东省的不同地区.本研究通过对可控源音频大地电磁测深在山东省浅部地下水勘查的运用分析,更好地掌握此方法和技术,以提高勘察水平,更多地发展和开采水资源.     

四级电测深法在探查地质构造中的应用

结合工程案例,介绍了电测深法在工程地质中的应用结果,说明了四级电测深法对工程地质的勘察有着一定的指导效果,在实际工程中是非常必要的,并对经济、技术等各方面都起着很大的帮助。     

落盘式测定法在云南亚热带人工草地产量估测中的应用

在云南亚热带人工刈割草地上,选用落盘式测产仪对草地产草量进行测产试验。分析草层压缩高度与鲜草产量、干物质产量之间的相关性,建立并验证草地产量的估测模型。结果表明,草层压缩高度与鲜草产量、干物质产量之间均存在显著的线性关系,草产量估测值与实测值之间显著相关。利用落盘式测产仪能够对云南亚热带人工刈割草地草产量进行快速而准确的估测。     

多波束数据检查标准化若干建议

多波束测深系统应用非常广泛,数据质量控制也非常重要。本文通过笔者多年的工作经验总结多波束数据检查的流程、内容及方法     

压电超声换能器匹配层的数值分析研究

压电超声换能器是一种能量转换器件,可将电声信号互相转换,匹配层作为超声导波换能器的重要组成部分,能实现声阻抗匹配或过渡,使压电晶片与被测物体之间的声强透射率大幅度提高,匹配层的声阻抗应该在压电晶片与被测物体的声阻抗之间。本文利用数值分析的方法,分析了两种不同材料的匹配层在不同频率下对声强透射率的影响,为换能器的匹配层设计提供了一定的理论基础。     

改进自动测调工艺技术 提高测试效率

随着注水井注水层级别的增加,常规测调技术已经很难满足高级别注水井的测调。自动测调技术的应用与推广势在必行,在不久的将来,必将取代传统的常规测调技术。     

地质工程勘测中高密度电法勘探的应用

运用温纳剖面法、施伦贝尔测深法对下洞室进行勘测,从测量结果来看,施伦贝尔测深法在接地条件较差时,所测得数据偏离较大,不能采用。温纳剖面法所测数据虽然可以采用,但是在反演过程中误差较大。在实际应用中宜改善接地条件并选择合适的勘测方法。     

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 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 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 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.

     

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.