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网口
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  net mouth
     With the dimensions and shapes of the trawls unchanged,the experimental results show that the average water resistance of the high strength polyethylene trawl nets was reduced by 6.5%~16.2%; the vertical opening of net mouth increased by 0.9%~25.7%,and the energy consuming rate reduced by 14.5%~33.5%.
     结果表明,在其它条件不变的前提下,应用高强度聚乙烯网线的拖网与原生产网相比,在2.5~4.5kn拖速下,网具阻力可平均下降6.5%~16.2%,网口垂直扩张可提高0.9%~25.7%,能耗系数下降14.5%~33.5%。
短句来源
     From 1993 to 1995 a rope trawl with different mesh sizes of 6 m,8 m and 10.8 m in the part of the net mouth was designed. In the fishing test its catch increased by 20%.
     1993~1995年,先后设计和试验了网口目大6m、8m、10.8m3种规格拖网,普遍增产20%以上。
短句来源
     The test showed: 1.By curve cutting in the top and bottom parts of the net mouth, net drag decreased by 3. 9% averagely,vertical opening and horizontal spreading averagely increased by 4. 7% and 7. 2% respectively.
     试验表明,(1)背腹网网口网衣弧形剪裁后,背腹网网衣受力均匀程度明显改善,网具阻力平均下降3.9%,网口垂直扩张平均增加4.7%,水平扩张平均增加7.2%。
短句来源
     According to the statistics,the net mouth circumference of rope trawl is 1.16 to 1.43 times as long as that of the macromesh trawl used in the same class of fishing vessels and is 1.88 to 2.16 times as long as that of the small mesh trawl,while the resistance of the gear reduced by 30%~34% and 40%~45% respectivly.
     据几顶有代表性的网具统计,绳拖网网口周长比同级渔船使用的疏目拖网增大1.16~1.43倍,比小目拖网增大1.88~2.16倍。
短句来源
     A DESIGN FOR THE STRUCTURE OF THE NET MOUTH OF ROPE TRAWL AND ITS RIGGING TECHNICS
     绳拖网网口结构设计和装配工艺
短句来源
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  net opening
     When the tow speed was 3.5kn,the resistance of 4-panel trawl was 44.57 kN,the vertical net opening was 5.9 m,the hydrodynamic coefficient was 2.32 m2/kN and the energy consumption coefficient was 1.20 kW.
     当拖速为3.5 kn时,四片式拖网的阻力仅为44.57 kN,网口高度达5.9 m,水动力性能系数为2.32 m2/kN,能耗系数为1.20 kW.
短句来源
     The height of the net opening is 12.6 meters. Trawling speed is increased io 3.0 - 3. 8 knots.
     网口高度达12.6m,拖速提高到3.0~3.8节。
短句来源
     RELATIONSHIP BETWEEN THE HEIGHT AND THE CIRCUMFERENCE OF NET OPENING IN 441 KW BOTTOM PAIR TRAWLERS
     441千瓦双船底拖网网口高度与网口周长的关系
短句来源
     The real time fishing measurement of the trawl performance shows that the height of the net opening of the new desigend trawl with large mesh(80 mesh× 3 000 mm and 66 mesh×3 000mm)were 14.2~15.1m,were more than double the contrast net.
     拖网作业性能通过海上实测表明 ,新设计的 80目× 30 0 0 mm和 6 6目× 30 0 0 mm大网目拖网网口高度达14 .2~ 15.1m,比普通生产网提高 2倍以上。
短句来源
     The results of real tests of the height of net opening for bottom trawls at sea by using 441 kW fishing boats during the period of 1986 to 1992 are reported.
     本文报道了1986~1992年期间对441kW渔船使用的11顶底拖网网口高度的海上实测结果。
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  “网口”译为未确定词的双语例句
     Height of trawl mouth H = 37. 93 V-0.618;
     网口高度H=37.93V-0.618;
短句来源
     Ratio of vertical opening Ch = 16. 22 V-0. 618;
     网口垂直扩张率Ch=16.22V-0.618;
短句来源
     Four standard WP2 zooplankton sets (0. 5 mm mesh size) were mounted at four levels on a stainless steel chassis: 10-40, 45-75, 80-110 and 115-145 cm from the bottom.
     4个标准WP2浮游生物网(网目0.5mm)嵌接在不锈钢架上,网口与海底距离分别为10—40,45—75,80—110,115—145cm。
短句来源
     Designs of Network Interface for ARM Network Program for Bootloader and Their Test Methods
     ARM网口、Bootloader中网络程序的设计及其测试方法
短句来源
     This reach adopt layered design of QoS control scheme which divide into user layer application layer and net interface layer.
     文章采用QoS控制分层设计方案,总共分为用户层、应用层、网口层。 提出了QoS分层模型中的过滤器的设计,以保障视频音频数据的顺利传输。
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  net mouth
The open area of mesh in each net, from largest to smallest mesh opening, was 3.7, 5.7 and 8.0 times the area of the net mouth.
      
Dye studies indicated that the number 20 net became progressively clogged from the cod end to the net mouth.
      
  net opening
Further inquiries may include acoustic and visual stimuli provided by an advancing net opening.
      
This trawling fleet fishes water 50 to 130 m deep, using double-rig nets with a net opening about 24 m.
      


Two-boat trawl is generally in use for fishing prawn (Penaeus orientalis) at Po Haiarea in autumn. Po Hai is not only the main fishing ground for prawns, but is also thespawning and nursery ground of many commercial fishes. Unfortunately, a considerablenumber of young fishes have been destroyed in the prawn trawing every autumn. It is avery serious problem for the fish stock, so that, a new two-boat long square prawn trawlwas designed in 1974--1977, in order to increase catching efficiency and to reduce thedamage...

Two-boat trawl is generally in use for fishing prawn (Penaeus orientalis) at Po Haiarea in autumn. Po Hai is not only the main fishing ground for prawns, but is also thespawning and nursery ground of many commercial fishes. Unfortunately, a considerablenumber of young fishes have been destroyed in the prawn trawing every autumn. It is avery serious problem for the fish stock, so that, a new two-boat long square prawn trawlwas designed in 1974--1977, in order to increase catching efficiency and to reduce thedamage on young fishes. The characterstics of this newly designed trawl are: its square was twice as largeas that of the original one, the side panels were added to increase the covered net moutharea and the height of trawl, in order to prevent prawn in jumping over the headline ofthe net when they touc on the ground rope, and its cod-end mesh size was increased to50 mm. Consequently it saves a large quantity of young fishes from escape. The experimental results are satisfactory. In comparing with the old trawl model inwater tank, the principal advanges of new trawl model are the lower resistance, the higherheadline and the larger area of the covered mouth. The fishing operations have provedthat the eatching efficiency is increased over 40% and the damage to young fishes redu-ced over 60%.

为合理利用我国北方海区对虾资源,每年秋季在渤海使用机动渔船双拖网捕捞生产。由于渤海既是主要的对虾渔场,又是多种经济鱼类产卵繁殖和幼鱼生长的良好场所。在拖网捕虾的同时,大量捕到当年的幼鱼,损害渔业资源。因此,在1974—1977年研究一种能够多捕对虾、大量释放幼鱼的新型双拖网。 新型网的主要特点如下:它的天井网比原型网长—倍左右,并增加侧网使网口的覆盖面积和网高相应扩大,防止对虾接触网具后弹跳逃逸;将囊网网目放大到50毫米,以释放网内的幼鱼。 试验效果较为满意。在模型网水槽试验中,新型网的主要优点是阻力较小、网口较高和网口前方覆盖面积较大。捕捞生产试验证明可以增产对虾40%以上,少捕幼鱼不少于60%。

A Iarge mumber of fishes in the East China Sea have the behavior of verticalmigration. In attempting to increase the fishing efficiency, a large-mesh trawlhas been designed for catching the fish in the higher level above than the normaltrawl can reach. From December 1977 to July 1978, the large--mesh trawl has beentested in comparison with the normal trawl. The result indicates that the large-meshtrawl has some advantages, such as higher trawl net mouth, less resistance, morecatches, etc.

东,黄海底拖网渔业的主要捕捞对象,大多具有垂直洄游或者栖息水层变动的习性。为了提高现有拖网渔轮的作业成绩,我们针对捕捞对象栖息水层较高的习性,设计了疏目拖网。在1977年12月至1978年7月期间,同原有网具作渔捞对比试验。试验结果表明,疏目拖网具有网口较高,阻力较小和产量较高等优点。

This paper describes a design for the structure of the net mouth of the two-panelbottom rope trawl, the method calculating the lengths of the headline, footrope andhanging line, and the rigging technics. According to the different working conditions between the headline and footrope,the following formulas are adopted. The headline (assuming the parabolic form): y =a_0x~2; s=integral from x_1 to x_2 (1+y'~3)~(1/2)dx The footrope (assuming the catenary form): y=a/2(e~(x/a)+e~(-x/a)); s=a/2(e~(x/a)-e~(-x/a)) Where...

This paper describes a design for the structure of the net mouth of the two-panelbottom rope trawl, the method calculating the lengths of the headline, footrope andhanging line, and the rigging technics. According to the different working conditions between the headline and footrope,the following formulas are adopted. The headline (assuming the parabolic form): y =a_0x~2; s=integral from x_1 to x_2 (1+y'~3)~(1/2)dx The footrope (assuming the catenary form): y=a/2(e~(x/a)+e~(-x/a)); s=a/2(e~(x/a)-e~(-x/a)) Where y-rope length; x-horizontal distance; a,a_0-parameter; s-headline orfootrope length The rigging technology for the headline, footrope and hanging line was designedin accordance with the characteristics of China's bottom trawl. It has been proved thatthe design and rigging described above are useful.

本文主要阐述适用于我国东海和黄海渔场的双船两片式底层绳拖网网口结构设计,上、下纲和悬纲长度计算方法及其装配工艺。根据绳拖网的上纲和下纲的工况特点,上纲呈抛物线状;下纲呈悬链线状,分别依据其各自的曲线方程组求算。关于悬纲和上、下纲之间的装配工艺,是按我国底层拖网特点设计的。经生产实践,证实这些设计和装配都是合适的。

 
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