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Advanced Search Results For "pump drill"

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 "pump drill"
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Determining In-Situ Stress State by Anelastic Strain Recovery Method Beneath Xiamen: Implications for the Coastal Region of Southeastern China.

Publication Type:Academic Journal

Source(s):Rock Mechanics & Rock Engineering; Sep2022, Vol. 55 Issue 9, p5687-5703, 17p

Abstract:Copyright of Rock Mechanics & Rock Engineering is the property of Springer Nature and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print...

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组合型孔排种器双充种室结构对充种性能的影响.

Publication Type:Academic Journal

Source(s):Transactions of the Chinese Society of Agricultural Engineering. 2018, Vol. 34 Issue 12, p8-15. 8p.

Abstract:为研究组合型孔排种器的双充种室结构对充种性能的影响,该文对组合型孔排种器的充种起始角和限种机构参 数进行了理论计算和试验验证。理论计算和以充种起始角为单因素变量的试验结果表明,组合型孔排种器在-40°左右的位 置开始充种。以型孔大小、充种起始角度和排种器工作转速为变量的多因素试验结果表明,最佳充种起始角为-20°;与-10° 和0 相比,充种起始角为-20°的平均穴粒数受排种器工作转速影响的变化更小,变异系数也更小。限种机构距离排种轮中 心40 mm 时最佳,解决了毛刷甩种的情况;以型孔大小、水稻品...

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间歇式自动取样条播排种器排种性能检测试验台研制. (Chinese)

Publication Type:Academic Journal

Source(s):Transactions of the Chinese Society of Agricultural Engineering; 2019, Vol. 35 Issue 24, p10-19, 10p

Abstract:Copyright of Transactions of the Chinese Society of Agricultural Engineering is the property of Chinese Society of Agricultural Engineering and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright hol...

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On the design of deep-hole drills with non-traditional ejectors.

Publication Type:Academic Journal

Source(s):International Journal of Production Research. Nov91, Vol. 29 Issue 11, p2297. 15p.

Abstract:This work deals with the development of design criteria for deep-hole drills with non-traditional ejectors of circular and plain type. An analytical method for design on non-traditional ejectors with circular jet was developed. The experimental investi...

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The ground stone components of drills in the ancient Near East: Sockets, flywheels, cobble weights, and drill bits

Publication Type:Academic Journal

Source(s):Journal of Lithic Studies, Vol 3, Iss 3 (2016)

Abstract:Three types of drills are known from antiquity: the bow drill, the pump drill and the crank drill. Each type often included ground stone components - sockets, weights and flywheels. However, these components are inconspicuous; on their own they are alm...

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Approaching prehistoric skills: experimental drilling in the context of bead manufacturing

Publication Type:Academic Journal

Source(s):Българско е-Списание за Археология, Vol 3, Iss 2, Pp 201-221 (2013)

Abstract:From the very Early Neolithic in the Balkans two categories of objects are recognized as having been involved in prehistoric drilling activities. The first is beads and other decorative and prestigious items made of bone, shell, pottery and various min...

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Optimizing long lateral completions with advanced stick pipe drill outs.

Publication Type:Periodical

Source(s):World Oil; Jul2019, Vol. 240 Issue 7, p29-32, 4p

Abstract:The article discusses the use of stick pipes as a preferred option for extended reach completions. It identifies the benefits of utilizing stick pipes, including streamlined drill outs as services providers reduce the number of vendors on site. Operato...

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Design and experiment of an air-suction potato seed metering device.

Publication Type:Academic Journal

Source(s):International Journal of Agricultural & Biological Engineering. Sep2016, Vol. 9 Issue 5, p33-42. 10p.

Abstract:An air-suction potato seed metering device was designed to improve the performance of the large-size seed crops planting equipment and provide a solution for problems on the mechanical potato seeder, such as high multiple-seeding index, high missing-se...

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Borehole stability analysis: Considering the upper limit of shear failure criteria to determine the safe borehole pressure window.

Publication Type:Academic Journal

Source(s):Journal of Petroleum Science & Engineering. May2022, Vol. 212, pN.PAG-N.PAG. 1p.

Abstract:The issue of borehole stability has attracted great attention worldwide but serious downhole problems still exist. The influences of various factors on borehole stability have been extensively studied in the literature. It is usually believed the lower...

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