轴管

Methods Eighty-two MR VEs were performed using navigator softwareon the workstation(Advantage windows 2.0, GE Medical Systems) based on 2D or 3D source image data sets of MR hydrography of urinary tract(n=33), cholangiopancreatic duct(n=16), spinal canal (n=8) and ventricle(n=5), and MR angiography intracranial (n=10) and abdominal (n=10) on 1.5T MR scanner.

将62例MR水成像(尿路33例，胰胆管16例，椎管8例，脑室5例)和20例MR血管造影(脑、腹部各10例)二维或三维扫描数据传输至工作站，用导航软件选择适当成像方式、阈值、视角及方向和人工伪彩色重建沿管腔长轴行进的内表面图像。

Further oxidation treatment or reduction treatment of molybdenum dioxide nanowire arrays resulted in molybdenum trioxide nanowire arrays and molybdenum nanowire arrays. We fabricated WO3 nanowire arrays successfully by further oxidizing W18O49 nanowire arrays. Based on the vertical aligned zinc oxide nanowire arrays, we prepared the aligned zinc oxide/silicon core-shell nanowire arrays, zinc oxide nanowire-zinc silicate nanotube heterojunction arrays and zinc silicate nanotube arrays by adjusting the size of the templates as well as the annealing temperature.

我们通过氧化和还原处理二氧化钼纳米线阵列，分别合成了三氧化钼纳米线阵列和单质钼纳米线阵列；通过氧化W18O49纳米线阵列合成了三氧化钨纳米线阵列；利用氧化锌纳米线阵列作为模板，通过调节氧化锌纳米线模板的尺寸和退火温度，合成了氧化锌－硅同轴纳米线阵列、氧化锌纳米线－硅酸锌纳米管异质结阵列和硅酸锌纳米管阵列。

Neuroectoderm; neural crest; neural plate; floor plate; neural tube; neuraxis; neurulation; neuroblasts; neural stem cells; neuroprogenitor cells; stem cells; differentiation; ontogeny; morphogenesis; histogenesis; organogenesis; synaptogenesis; gangliogenesis; embryogenesis; axonogenesis; retinogenesis; gliogenesis; glial progenitor cells; oligodendrocyte progenitor cells; retinal progenitor cells; nerve growth factor; neurotrophic factors; trophic factors; growth factors; neural tube defects; anencephaly; spina bifida; neuroblastoma cells; neurogenesis; development; developmental stages

神经外胚层；神经脊；神经板；底板；神经管；轴索；神经胚形成；成神经细胞；神经干细胞；神经母细胞；干细胞；分化；个体发生；形态发生；组织发生；器官发生；突触发生；gangliogenesis；胚胎发生；axonogenesis；retinogenesis；gliogenesis；神经胶质祖细胞；少突神经胶质细胞祖细胞；视网膜祖细胞；神经生长因子；神经营养因子；营养因子；生长因素；神经管故障；无脑；脊柱裂；成神经细胞瘤细胞；神经发生；发展；发展进程

Neuroectoderm; neural crest; neural plate; floor plate; neural tube; neuraxis; neurulation; neuroblasts; stem cells; differentiation; ontogeny; morphogenesis; histogenesis; organogenesis; synaptogenesis; gangliogenesis; embryogenesis; axonogenesis; retinogenesis; gliogenesis; glial progenitor cells; oligodendrocyte progenitor cells; retinal progenitor cells; nerve growth factor; neurotrophic factors; trophic factors; growth factors; neural tube defects; anencephaly; spina bifida; neuroblastoma cells; cell migration; neurogenesis; development; developmental stages

神经外胚层；神经脊；神经板；底板；神经管；轴索；神经胚形成；成神经细胞；干细胞；分化；个体发生；形态发生；组织发生；器官发生；突触发生；gangliogenesis；胚胎发生；axonogenesis；retinogenesis；gliogenesis；神经胶质祖细胞；少突神经胶质细胞祖细胞；视网膜祖细胞；神经生长因子；神经营养因子；营养因子；生长因素；神经管故障；无脑；脊柱裂；成神经细胞瘤细胞；细胞迁移；神经发生；发展；发展进程首页上一页下一页末页共有 22 条记录，本页从第 11 到第 20 条。

With the combination of heat pipe technology and catalytic reactor,a novel-style ophidian loop heat pipe chemical reactor was established,by which an industrial sidetrack experiment with methyl tert-butyl ether synthesis was carried out.

将热管技术与催化反应器结合，构建了蛇形回路热管反应器。利用该反应器，进行了轻烃醚化工业侧线试验，考察了进料温度、液相体积空速、冷却水流量、进料浓度对反应结果的影响；测定了催化床层的轴向温度分布。

Axial insulation structure was optimized to reduce potential gradient in DC high-voltage accelerating tubes of 500 mA.

为了降低500 mA直流高压加速管高梯度区的电位梯度，对加速管轴向绝缘结构进行优化设计。

An upper base (1) of the reaction device is coaxially arranged into a water cooling sleeve (2); the connection of the upper base and the water cooling sleeve is welded and sealed to form a water cooling chamber; an anode current collecting Pt net (12) is used for collecting current from the anode of a button-typed solid oxide fuel battery (16); two ends of an anode current collecting Pt wire (15) are respectively used as an reference electrode and a testing electrode; the temperature measuring point of a temperature measuring thermal-couple (17) and the button-typed solid oxide fuel battery (16) keep in the same height; the bottom of an anode chamber pipe (6) is inserted into the upper hole of a lower base (43); the lower surface of a quartz sand sintering plate (42) is provided with a carbon fuel thermal-couple (56); all pipes and sealing heads (46) are hermetically connected with each other.

该反应装置上底座(1)同轴放入上水冷套(2)中并对连接处焊接密封形成水冷腔体；阳极集流铂网(12)用于从纽扣式固体氧化物燃料电池(16)阳极上收集电流，阳极集流铂丝(15)两头分别用作参比电极和测试电极；测温热电偶(17)测温点与纽扣固体氧化物燃料电池(16)保持同一高度；阳极腔体管(6)底部插入下底座(43)上部孔中；石英砂烧结板(42)下面布置碳燃料热电偶(56)；所有管件与封头(46)连接密封。

The number and distribution of the singular points of streamlines in the cross section of steady flow through a curved tube are discussed by using the method of topological structure analysis.

利用拓扑结构分析方法，分析了弯曲圆管内定常流在横截面上流线的奇点个数及分布规律，给出了二次流的漩涡数目由 2个变为 4个，流态结构发生分叉现象的理论判据·进而，利用Galerkin方法，得到了弯曲圆管内定常流的流函数和轴向速度的半解析表达式，给出了流态结构发生分叉现象的临界Dean数，所得结果与理论判则一

A fuel injector includes a tube member and a valve element to slide axially in the tube member.

燃料喷射器包括管件和阀元件，所述阀元件在管件中轴向上滑动。

Experimental study was conducted on flow characteristics of catalyst in a standpipe with f108 mm4 mm and height of 10 m.

对垂直立管中催化剂的流动性能进行了实验研究，测定了各种操作条件下立管中的轴向压力分布、催化剂循环速率以及附加吹气的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。