内轴

Simulative results show that the electron beam can be transported in the unmagnetized plasma-filled for two reasons. The first, the plasma neutralizes the majority of the space charge forces within the beam. The second, radial electric field generated by electron beam interaction with the plasma leads the beam to converge along axis. By PIC simulation, we find that atomic mass of the background ion effects on the Characteristics of the plasma-filled devices.

非磁化等离子体填充的RBWO-FEL的模拟表明只有在一较窄的背景等离子体密度范围内，电子注才能良好传输，产生泵波及激光功率输出，并都存在有峰值功率点，同实验观测到的结果完全吻合；该范围内，电子注的传输是由于背景离子中和了注中径向发散空间电荷力及注在等离子体中产生的径向的电场使注在轴向汇聚。

OBJECTIVE: To explore cervical adjacent zygapophyseal joint stress distribution following two level ADR and anterior cervical discectomy and fusion, so as to provide biomechanical reference for clinical application of two level ADR.

目的：观察轴向载荷对双节段颈椎人工椎间盘置换和前路椎间融合内固定对邻下位节段关节突关节内压力的影响，以期为双节段人工颈椎间盘置换的临床应用提供生物力学依据。

Department of orthopaedics, Xiangya Hospital, Central-south University, Changsha, China3 Objectives: To study cervical adjacent zygapophyseal joint stress distribution following two level ADR and ACDF on, in order to provide biomechanical reference for clinical application of two level ADR. Methods: Eleven healthy adult fresh-frozen multi-segmental cervical spine segments were utilized in this study and biomechanically evaluated under the following C4/5, C5/6 cervical disc conditions:⑴intact spine;⑵he Bryan Disc prosthesis implantation;⑶the intervertebral fusion.

取11具新鲜完整的成人下颈段标本，按实验先后分别制成C4/5、C5/6椎间盘完整、椎间盘置换、椎间融合三个模型组，在标本上施加轴向分级载荷，将微型阻电式压力传感器置入C5/6、C6/7关节突关节内，测量合组各分级载荷下C5/6、C6/7关节突关节内的压力。

Is a company specializing in the production of electricity of standard parts, steel standard parts, automobile standard parts, standard parts pipeline, railway standard parts, the new GB standard parts, building standard parts, stainless steel fasteners, high-precision standard parts, high precision fasteners, non-standard fasteners, non-standard fasteners, standard 4.8, 8.8 standard parts, standard parts 10.9, 12.9 standard, GB standard, the new GB standard, British standard standard parts , American standard standard parts, standard parts de superscript, subscript day standard parts, construction fasteners, building hardware, light bolt, square head bolts, hexagon bolt, hexagon bolt big, hot hit bolts, steel bolts, GB30-76 bolts, 5781 Bolt, Bolt 5782, Bolt 5783, Bolt 5784, 5785 bolts, steel structure with high strength bolts connecting deputy, steel torsional shear type high strength bolts used to connect deputy, steel structure with high strength bolts connecting deputy, high-strength steel large hexagon head bolts to connect the Deputy, high strength bolts, tower bolts, rail bolt, wheel bolts, wheel screws, carriage bolts, head bolts, stainless steel bolts, screws Terrier reduction, four wire, to the foot silk, silk double-headed, square head silk, bucket-type wire, fish wire, oval wire, full-profile wire, hook the first wire, the back wire, live wire section, expansion of silk, silk expansion implosion, implosion-type expansion of silk, expansion bolts, railway screw, nut , self-locking nut, hexagonal nut, locknut, galvanized nuts, weld screws, arc stud welding with welding cylinder head screws, weld stud, weld nails without a head, cylinder head welding nails, pin, fastener, standard parts, Yamagata card, u-type cards, special bolts, special-shaped standard parts, special fasteners professional production enterprises.

河北冀南标准件有限公司是一家专业生产电力标准件，钢结构标准件，汽车标准件，管道标准件，铁路标准件，新国标标准件，建筑标准件，不锈钢标准件，高精度标准件，高精度紧固件，非标标准件，非标紧固件，4.8级标准件，8.8级标准件，10.9级标准件，12.9级标准件，国标标准件，新国标标准件，英标标准件，美标标准件，德标标准件，日标标准件，建筑扣件，建筑五金，光螺栓，方头螺栓，六角螺栓，大六角螺栓，热打螺栓，钢结构螺栓， GB30-76螺栓，5781螺栓，5782螺栓，5783螺栓，5784螺栓，5785螺栓，钢结构用高强度螺栓连接副，钢结构用扭剪型高强度螺栓连接副，钢结构用高强度螺栓连接副，钢结构用高强度大六角头螺栓连接副，高强度螺栓，铁塔螺栓，铁道螺栓，轮毂螺栓，轮毂螺丝，马车螺栓，沉头螺栓，不锈钢螺栓，缩梗螺丝，四角丝，地脚丝，双头丝，方头丝，斗型丝，鱼尾丝，鹅蛋丝，全纹丝，钩头丝，靠背丝，活节丝，膨胀丝，内爆膨胀丝，内爆式膨胀丝，膨胀螺栓，铁道螺钉，螺母，自锁螺母，六角螺母，防松螺母，镀锌螺母，焊钉，电弧螺柱焊用圆柱头焊钉，焊接螺柱，无头焊钉，圆柱头焊钉，销轴，紧固件，标准件，山形卡，u型卡，异型螺栓，异型标准件，异型紧固件的专业生产企业。

For eccentric locking collar type bearing, rotating the eccentric locking collar to lock the shaft by hand in direction of the rotation. Then tighten the set screw which located at the eccentric locking collar.

对于带偏心紧固套的外球面球轴承，将偏心套套在轴承内圈的偏心台上，沿轴的旋转方向拧紧偏心套，再用内六角螺钉扳手拧紧偏心套上的紧定螺钉。

Mainly engaged in: stainless steel 202,304,316, copper, aluminum, high-strength carbon steel GB, American Standard, S Day, German standard of the outer hexagon, internal hexagon, Ping Cup, Yuan Cup screws, tight set (machine-processed rice) screws, open sale, axis with circlips, ring openings, flat pad, flexible sale, the Quartet nut, hexagonal nut, welding nut, pull rivet nut, rivet nut pressure, flange nut, nylon self-locking nuts, nut dish, cover type nut, flat keys Article teeth, the cylindrical pin, internal tooth, external tooth, double-headed screws, wood screws Festival, self-tapping screws, self drilling screws, machine screws , hexagonal key.

主要经营：不锈钢202、304、316、铜、铝、高强度碳钢国标，美标，日标，德标的外六角，内六角，平杯、元杯螺丝，紧定螺丝、开口销，轴用卡簧、开口挡圈，平垫，弹性销，四方螺母，六角螺母，焊接螺母，拉铆螺母，压铆螺母，法兰螺母，尼龙自锁螺母，碟型螺母，盖型螺母，牙条平键条，圆柱销，内齿，外齿，双头螺丝，活节螺丝，自攻螺丝，自钻螺丝，机螺丝，六角匙。

The results show that space finite analysis results are close to test ones, bottom chords suffer axial force and large in-plane bending, and the max stress is nearby each middle internode. The max stress of node crossbeams occurs in No.2 bottom flange, and that of internode crossbeams happens in ones lying in the middle of every internode. The concrete slab is in tension at the longitudinal direction, and also suffers bent at vertical loads. The degree of completely-composite model taking part in the combined actions is about 55%, while that of semi-composite model is 42%-43%. The combination of concrete slab and bottom chord increases the degree of floor system taking part in the combined actions, lightens the burden of bottom chord, and reduces out-of-plane bending of node crossbeams especially the ones near bridgehead. Stress and displacement of main truss can be evaluated by a equivalent plane rigid frame in preliminary design, and effective stiffness of bottom chords are composed of original ones and concrete slab, and the concentrated load from deck can be translated into uniform load.

研究结果表明：空间有限元分析结果与试验结果较吻合；下弦杆受到轴向拉力和较大的面内弯矩作用，各节间最大应力出现在节间中点附近；节点横梁最大应力发生在横梁2的下翼缘，节间横梁最大应力发生在位于端节间中部的小横梁上；混凝土板顺桥向整体受拉，并在竖向集中荷载作用下产生弯曲变形；全结合模型大部分节间内的桥面板参与主桁共同作用的程度为55%左右，半结合模型桥面板的参与程度为42%~43%；桥面板与下弦杆结合能够增加桥面板的参与程度，减轻下弦杆荷载，减少节点横梁尤其是靠近桥头横梁的面外弯曲；对桥梁进行初步设计时，主桁杆件的位移与内力可按照1个等效的平面刚架计算，下弦杆的等效刚度由原下弦杆截面和混凝土桥面板截面组合而成，桥面荷载可转化为均布荷载施加。

Double row tapered hole cylindrical roller bearings with inner ring and shaft are tapered 1:12, bearing lock nut with a round led a bearing in the axial displacement of the inner ring bearings and expansion, to reduce or eliminate Bearing radial clearance purposes.

圆锥孔双列圆柱滚子轴承的内圈和配合轴径均为1：12圆锥，用圆螺母锁紧轴承则使轴承在轴向产生一个位移并使轴承的内圈膨胀，从而达到减少或消除轴承径向游隙的目的。

As a downstream piping system when the valve opens, reflux valve, when closed, the main medium used to prevent backflow to prevent the pump and drive motor reversal, as well as a container medium discharge; currently the most commonly used is the valve flap around the body Swing Pin rotation flap valve and the valve body along the vertical axis to move lift check valve, but the above two kinds of structures exist in the valve closed, medium speed back quickly from the largest drop to zero, inlet side of the pipe resulted in the rapid pressure rise, resulting Proportional Pressure Reducing Valves in damaging effects on the piping system of water hammer phenomenon, it is generally a diameter of valve production of 50 ~ 500 mm.

止回阀作为管道系统顺流时开启，逆流时关闭的阀门，主要用于防止介质倒流，防止泵及驱动电机反转以及容器内介质泄放；目前使用最普遍的是阀瓣围绕阀体销轴旋转的旋启式止回阀和阀瓣沿着阀体垂直中心线移动的升降式止回阀，但以上2种结构的阀门均存在关闭时介质倒流速度从最大迅速降为零，致使管道进水管一侧内压迅速升高，从而产生对管路系统有破坏作用的水锤现象，所以一般止回阀生产口径为50～500 mm。

Nanostructured ZnO films with grain size of 28～35 nm have been prepared on quartz glass substrates by pulse laser ablation of Zn target in oxygen atmosphere. The structural and optical properties of the films were studied. ZnO thin films with typical c-axis (002) orientation were successfully deposited at a range of 100～250 ℃. The results obtained by X-ray diffraction and photoluminescence measurements show that the strong UV emission centering is about 378～385 nm and deep-level emission centering about 518～558 nm in the room temperature PL spectra of the ZnO films.

利用脉冲激光沉积法在氧气氛中烧蚀锌靶制备了纳米晶氧化锌薄膜，衬底为石英玻璃，晶粒尺寸约为28～35 nm.X射线衍射结果和光致发光光谱的测量表明，当衬底温度在100～250 ℃范围内时，所获得的ZnO薄膜具有c轴的择优取向，所有样品的强紫外发射中心均在378～385 nm范围内，深能级发射中心约518～558 nm，衬底温度为200 ℃时，得到了单一的紫外光发射。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。