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cylinder-
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     WATER CYLINDER
     水柱体
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     SEAL OF HYDRAULIC CYLINDER
     浅谈液压缸的密封
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     Dual-action Telescopic Cylinder
     双作用伸缩式液压缸
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     Renovating Technology of Hydro-cylinder
     液压油缸的修复工艺
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  cylinder-
Infinitesimal rigidity of cone-like and cylinder-like frameworks
      
This study investigates the tribological properties of the coatings by conducting wear tests against an AISI 1045 steel counterbody under a cylinder-on-disk line contact wear mode using an oscillating friction and wear tester.
      
Evaluation of properties of the cases obtained comprised hardness measurements and wear tests, carried out by the 3 cylinder-cone method.
      
Two contact geometries were used: cylinder-on-flat and flat-on-flat.
      
Polyimide is slid against steel on a cylinder-on-plate tribotester at 50-200 N and 0.3 m/s.
      
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A right hallow circular cylinder of quartz having its generator parallel to the principal axis liberates electricity when subjected to torsion about its axis. Charges of opposite signs appear on the inner and outer surfaces. When torsion is applied in the same sense as that of the optical rotation, positive electricity is developed on the outer surface, and vice versa. The quantity of electricity produced by the action of a couple of moment C on a hollow quartz cylinder of external diameter d0, internal...

A right hallow circular cylinder of quartz having its generator parallel to the principal axis liberates electricity when subjected to torsion about its axis. Charges of opposite signs appear on the inner and outer surfaces. When torsion is applied in the same sense as that of the optical rotation, positive electricity is developed on the outer surface, and vice versa. The quantity of electricity produced by the action of a couple of moment C on a hollow quartz cylinder of external diameter d0, internal diameter di and length l is klC/do do-di), where k is equal to 9.2x10-8 in absolute C. G. S. electrostatic units.

割水晶成一圆柱,圆柱之轴即为晶体之光轴,在圆柱之中心穿一孔道,使成一空心圆柱壳,以金属箔敷於圆柱壳内外侧面成两电极。当圆柱之一端固定,一端被扭,则两电极发生异号而等量之电荷,扭转之方向既易,内外两极电荷之号亦互易。若扭力偶矩左旋,则左旋水晶柱之外极得正电;若扭力偶矩右旋则右旋水晶柱之外极得正电。 吾人曾由实验测定水晶圆柱之长短l,内外直径d_i及d_0之大小,与由扭偶矩C所生电量q之关系式如次: q=k(l/(d_0(d_0-d_i)))C式中K为一常数,在C.G.S.绝对静电单位制中等於9.2×10~(-8)。

The circumferential vibration of a hollow quartz cylinder has been thoroughly studied. The empirical relation connecting the dimensions of the cylinder and the frequency of vibration has been formulated, and the temperature coefficients of the frequency determined. The temperature coefficient is practically zero for a wide range of temperature, when the ratio of the internal radius to the external radius of the cylinder approaches a value which is very close to 0.5.

以纯粹水晶割成空心圆柱,令圆柱之轴平行於晶体之光轴。于其里外二面,敷以铜质管状电极、置诸最简单之Pierce式振荡线路中,即能自生振动其振动之方式繁多,俱经吾人详细阐求,已在另文发表,茲不复赘。 各种振动方式中,以绕周振动发生最易。设圆柱内径与外径之比小于一去0.5极近之数,则绕周分三段而振动;设大于此数,则分六段而振动, 绕周振动之温度系数,亦经测定其法置圆柱於一特制之电炉中,连其二电极於振荡电路,令生振动。以所生高周率电流与一周率甚近之水晶片所生之高周率电流相干涉,由 是而生之低周率音差,复与一低周率振荡器相比较,若是则加热后圆柱振动周率之变化,可在该低周率振荡器上直接读之。 若是所得之结果绕周振动之温度系数,随其内外径之比而异。圆柱之绕周分三段而振动者,其温度系数常为正;内外径之比率增加,则温度系数减少。圆柱之线周分六段而振动者,其温度系数常为负;内外径之比率愈高,则温度系数愈大。惟适当三段振动告终六段振动肇端之时,则亘十馀度其周率几不以温度而变合二十馀度而平均计之其温度系数约为0.5×10~(-6)/C,小於寻常水晶片者五十馀倍。割制此种圆柱,并无繁难,且电极简单,装置便利以之控制振荡,校准周率,对无...

以纯粹水晶割成空心圆柱,令圆柱之轴平行於晶体之光轴。于其里外二面,敷以铜质管状电极、置诸最简单之Pierce式振荡线路中,即能自生振动其振动之方式繁多,俱经吾人详细阐求,已在另文发表,茲不复赘。 各种振动方式中,以绕周振动发生最易。设圆柱内径与外径之比小于一去0.5极近之数,则绕周分三段而振动;设大于此数,则分六段而振动, 绕周振动之温度系数,亦经测定其法置圆柱於一特制之电炉中,连其二电极於振荡电路,令生振动。以所生高周率电流与一周率甚近之水晶片所生之高周率电流相干涉,由 是而生之低周率音差,复与一低周率振荡器相比较,若是则加热后圆柱振动周率之变化,可在该低周率振荡器上直接读之。 若是所得之结果绕周振动之温度系数,随其内外径之比而异。圆柱之绕周分三段而振动者,其温度系数常为正;内外径之比率增加,则温度系数减少。圆柱之线周分六段而振动者,其温度系数常为负;内外径之比率愈高,则温度系数愈大。惟适当三段振动告终六段振动肇端之时,则亘十馀度其周率几不以温度而变合二十馀度而平均计之其温度系数约为0.5×10~(-6)/C,小於寻常水晶片者五十馀倍。割制此种圆柱,并无繁难,且电极简单,装置便利以之控制振荡,校准周率,对无线电通讯,裨益实多也。

The present paper reports on two lamellicorn beetles: Adoretus tennuimacu-latus Waterh. and Liocola brevitarsis Lew. The former belongs to the subfamilyRutelinae and the later Cetoniinae. Adoretus tennuimaculatus has two generations per year at Lientang. Thefirst active period of adults mostly occured in June and the second period inAugust. After 7: 30 at night, the adults went out and stayed on various hostplant leaves feeding or copulating and then back into earth at dawn. Larvaewere not strict in selecting...

The present paper reports on two lamellicorn beetles: Adoretus tennuimacu-latus Waterh. and Liocola brevitarsis Lew. The former belongs to the subfamilyRutelinae and the later Cetoniinae. Adoretus tennuimaculatus has two generations per year at Lientang. Thefirst active period of adults mostly occured in June and the second period inAugust. After 7: 30 at night, the adults went out and stayed on various hostplant leaves feeding or copulating and then back into earth at dawn. Larvaewere not strict in selecting the soil but most of them lived in the garden soil,mound soil and. clay landside. Liocola brevitarsis has only one generation per year at Lientang. The adultperiod was from June to September and some of them lengthened out mid-Octo-ber. Adults flied out at day time and sucked the different part of hosts: as theflesh of fruit, the juice of tree and the corn ear, once in a few days. Larvaeselected the soils more strictly. They concentrated in compost and rich humussoil. Controlling methods: (1) To spray 0.5%γ666 or 25% DDT emulsion (250water:1 emulsion) once to the host leaves was effective in protecting against theadults of Adoretus till its last period of activity. (2) To shake the tree to makethe adults of Adoretus fall down and then unroll a piece of white cloth underthe tree to gather the adults. (3) To make a bamboo cylinder, 12-16 in. long,which was filled with rotten fruits and nectar, and trap all the adults of Liocolain this cylinder. (4) To clean out the compost before June in order to kill mostof the larvae and pupae of Liocola.

1.本文所述的两种金龟子,其一为茶色金龟子,属鞘翅目,金龟子科中的Rutelinae亚科,其二为铜色白纹金龟子,属Cetoniinae亚科。 2.茶色金龟子在莲塘一年发生二代。其第1次成虫盛期多在6月。第2次则在8月;铜色白纹金龟子,一年仅发生一代,其成虫出现期为6至9月,少数可延长到10月中旬。 3.茶色金龟子的成虫,为夜出性,傍晚7时半后,即开始出土,停息在多种寄主植物的叶片上,取食或交配,拂晓时飞返土中。铜色白纹金龟子的成虫,为日出性,取食成熟果子,玉米苞穗及多种树木的浆汁,亦喜取食。既钻入后,可连续数日不出。 4.两种金龟子的幼虫,都栖息在土中。茶色金龟子幼虫以在菜园土中、丘陵黄土地及属于粘壤性质的田塍内为多,对于土壤性质选择,较不严格。铜色白纹金龟子幼虫则多集中在腐熟的堆肥及腐殖质极丰富的土中,对于土壤,有比较严格的选择性。 5.关于防治方法:茶色金龟子在成虫期曾试用了0.5%γ体666粉及25%DDT乳剂(1份加水250份〕喷撒,第1种药适用于叶面较粗糙的植物,第2种则可用于叶面较光滑的植物,只要喷撒1次,便能在整个成虫发生期中,避免其飞来取食。铜色白纹金龟子的成虫,则可采用竹筒诱杀,筒高12—1...

1.本文所述的两种金龟子,其一为茶色金龟子,属鞘翅目,金龟子科中的Rutelinae亚科,其二为铜色白纹金龟子,属Cetoniinae亚科。 2.茶色金龟子在莲塘一年发生二代。其第1次成虫盛期多在6月。第2次则在8月;铜色白纹金龟子,一年仅发生一代,其成虫出现期为6至9月,少数可延长到10月中旬。 3.茶色金龟子的成虫,为夜出性,傍晚7时半后,即开始出土,停息在多种寄主植物的叶片上,取食或交配,拂晓时飞返土中。铜色白纹金龟子的成虫,为日出性,取食成熟果子,玉米苞穗及多种树木的浆汁,亦喜取食。既钻入后,可连续数日不出。 4.两种金龟子的幼虫,都栖息在土中。茶色金龟子幼虫以在菜园土中、丘陵黄土地及属于粘壤性质的田塍内为多,对于土壤性质选择,较不严格。铜色白纹金龟子幼虫则多集中在腐熟的堆肥及腐殖质极丰富的土中,对于土壤,有比较严格的选择性。 5.关于防治方法:茶色金龟子在成虫期曾试用了0.5%γ体666粉及25%DDT乳剂(1份加水250份〕喷撒,第1种药适用于叶面较粗糙的植物,第2种则可用于叶面较光滑的植物,只要喷撒1次,便能在整个成虫发生期中,避免其飞来取食。铜色白纹金龟子的成虫,则可采用竹筒诱杀,筒高12—16寸,筒内盛腐熟果子及蜜,贴靠枝杆悬挂,能将圆内所有成虫,全部诱入筒中。此外,前一种成虫,并可利用外出?

 
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