查询词典 screw

Firstly, velocity expression of translational parallel manipulator was presented based on the screw theory. Secondly, the actuated screw, the actively unactuated screws and idle screws of each limb were determined according to the reciprocal screw theory. Then, all basic kinematic chains were enumerated by means of the number of limb connectivity and the limbs containing closed-loops were obtained by replacing the passive prismatic joints in the basic kinematic chains with planar closed-loop structures.

首先基于螺旋理论给出移动并联机构的速度表达式，然后根据互易螺旋理论确定出分支的主动螺旋、可动非主动螺旋和惰性螺旋，再依照分支连接度的不同列举出所有可行的基本分支运动链，并通过运动副替换得到分支中含有闭回路结构的运动链，最后利用所综合出的支链按照主动副的配置要求将动平台和静平台连接起来即可实现预期的机构。

Stainless steel concave end knurling;DIN915 Stainless steel cylindrical end; DIN914 Stainless steel pointed end; DIN916 Stainless steel concave end; DIN913 Stainless steel flat end; DIN551 Stainless steel slotted point; DIN906 Stainless steel oil plug,semi-circular; Stainless steel two-end hexagonal non-standard; Brass internal hexagonal,cross,non-standard; Brass wobbler,nickel-plated; Stainless steel ,alloy steel heat-resistant; Alloy steel zinc-plated; Alloy steel semi-circular; DIN915 Alloy steel cylindrical end, Philips screw non-standard; DIN916 Alloy steel concave end;DIN914 Alloy steel pointed end;DIN906 Alloy steel oil plug; Corrugated ball; Two-end internal hexagonal non-standard; Textile machine screw-nail; Tool-post screw-nail

不锈钢凹端滚花；DIN915 不锈钢柱端；DIN914 不锈钢尖端；DIN916 不锈钢凹端；DIN913 不锈钢平端；DIN551 不锈钢一字槽；DIN906 不锈钢油塞、半圆；不锈钢2头内六角非标；黄铜内六角、十字槽、非标；黄铜梅花头、镀镍；不锈钢、合金钢耐落；合金钢镀锌；合金刚半圆；DIN915 合金钢柱端、十字槽、非标；DIN916 合金钢凹端；DIN914 合金钢尖端；DIN906 合金钢油塞；波珠；2头内六角非标；纺织机螺钉；刀架螺钉。

Our products are tapping screw、machine screw, wood screw, and wire rod.

主导产品为各种自攻钉、机螺钉、木螺钉和线材改制。

A mixing performance analysis on the different screw configuration in the process of twin screw codirectional extrusion;2. The filling ratios in the main reactive zones were estimated by clam barrel for different screw configuration s.

研究了不同螺杆构型下的充满度以及低密度聚乙烯熔融接枝马来酸酐的过程，探讨了不同螺杆构型下充满度与接枝反应挤出过程的关系。

The screw entry point was located at the tip of transverse process. The average inclination angle should be 10°-20° headward and 30°-40° toward neutral line respectively. The screw was inserted and entered into the vertebral body along the external cortex of pedicle. The integrity of cortical bone around screws, the distance to segmental blood vessels and the penetration of cortex were observed after operation to evaluate the accuracy and safety of screw placement. Among 160 thoracic pedicle screws that were implanted in 34 cases, 148 screws (92.5%) were accurately inserted inside the costotransverse unit, and 12 screws (7.5%) were misplaced according to the image of X-ray and CT thin-slice scan.

应用椎弓根外内固定技术2004/2007年在中山大学附属第三医院骨科治疗34例患者，固定前采用CT加密扫描测量进钉点、进钉点至椎体前缘的深度、进钉角度和直径，固定中椎弓根钉入点为横突尖，进钉方向为平均向头侧倾斜10°~ 20°、与中线成角30°~40°，顺椎弓根外侧皮质进入椎体，固定后CT加密扫描观察螺钉周围的皮质骨是否完整、是否靠近节段血管、是否穿透皮质骨，评价置入钉的准确性和安全性。34例患者共置入160枚胸椎椎弓根螺钉，固定后CT加密扫描和X射线片观察到148枚(92.5%)螺钉置入准确，12枚(7.5%)螺钉发生错置。

Finally heat the starch to 80℃dextrinize 2h,keep warm 0.5h,then cooled to 40℃,add 2.8%CAN initiator,7.5%MMA monomer,sealed and stir 3.3hours of the nitrogen atmosphere,using the screw rod center distance is 32mm,expects the tube diameter phi300mm major axis compared to L/D is 12.5 double screw rods extruding machines,controls the screw rod rotational speed 100rpm sample water content when 20%squeezes out,and the results indictated that the sample may bear 302℃within the high temperature,the water resistance is 14.7%,buried in the simple earth passes through about 180 day to be allowed to achieve the nearly 60%weightlessness rate, and can be basically completely degrades.

因此将淀粉80℃糊化2h，保温0.5h，40℃添加2.8%引发剂，7.5%MMA单体，通氮气密封搅拌反应3.3小时后的接枝产物，利用螺杆中心距为32mm，料筒直径f300mm长径比L/D为12.5的双螺杆挤出机，控制螺杆转速100rpm样品含水量20%时挤出，测定知道样品可以耐302℃以内的高温，耐水性为14.7%，在简单土埋的情况下，经过180天左右可以达到近60%的失重率，可以说基本上完全降解。

Adopting special lantern gear to minify the drive error of the screw drive chain on CA6140 lathe,high-precision inch-system lead screw and modulus lead screw can be processed.

采用专用挂轮，减小了CA6140螺纹传动链的传动误差，可加工出高精度英制丝杠和模数丝杠。

METHODS: The stability of intact specimens in flexion, extension, lateral bending and torsion was examined. A fracture model was created using dropping technique. The fracture model was instrumented with short-segment pedicular screw fixation (4-screw construct) or the intermediate screws structure (6-screw construct).

测量完整标本前屈-后伸、侧屈及旋转的稳定性后，通过重物撞击技术制造伤椎骨折模型，然后对每个标本行传统短节段椎弓根螺钉固定（4枚螺钉固定）及增加骨折椎椎弓根螺钉固定（6螺钉固定）。

［Objective］To study the biomechanical stability of slidable pedicle screw system with the comparison of slidable pedicle screw system and universal pedicle screw system in intensity,rigidity and other biomechanical functions.

［目的］对滑动椎弓根钉系统与通用椎弓根钉系统在脊柱侧凸固定强度、刚度和稳定性等方面进行生物力学比较，以测试滑动椎弓根螺钉内固定系统稳定性的生物力学性能。

［Objective］To study the biomechanical stability of slidable pedicle screw system with the comparison of slidable pedicle screw system and universal pedicle screw system in intensity,rigidity and other biomechanical functions.［Method］Twelve spinal specimens of the pig were randomly divided into two groups and the schubweg on the vertebra of T12 were measured in different conditions.In the end the intensity and rigidity of two groups were compared which were computed by the schubweg.

［目的］对滑动椎弓根钉系统与通用椎弓根钉系统在脊柱侧凸固定强度、刚度和稳定性等方面进行生物力学比较，以测试滑动椎弓根螺钉内固定系统稳定性的生物力学性能［方法］采用12具猪新鲜脊柱标本，随机分成两组分别测量不同工况下T12椎体的位移，并计算其强度和刚度进行比较。

A historical region of southwest France between the Pyrenees and the Garonne River. The duchy of Aquitaine was joined with France after the marriage of Eleanor of Aquitaine to King Louis VII in1137, but its possession was disputed after her subsequent marriage to Henry II of England.

阿基坦法国西南部一个历史地区，位于比利牛斯山和加隆河之间，在1137年阿基坦的埃莉诺与国王路易斯七世结婚之后阿基坦公国加入法国，但当她再嫁英国亨利二世后，其归属权便受到争议

There are moments when I look at the smiling , happy faces of my expectant staff and wonder how they will cope when confronted by an outraged housemaster along with an unrepentant and recalcitrant bleached blond teenager in 18 years ' time .

有时候，我看着那些满怀期待的员工微笑，幸福的脸，想着当他们遇到一位愤怒的宿舍管理员和一位不知悔改，叛逆，而且将头发染成白色的18岁少年时，他们会如何处理。