基于虚拟仿真的外流式压力机械设备的三维设计与加工

目前设计的外流式压力机械设备的三维设计与加工方法建立的三维模型得到的参数与实际参数相差较大,导致加工时间过长。为了解决上述问题,基于虚拟仿真研究了一种新的外流式压力机械设备的三维设计与加工方法。利用机械设备组件的管端托架、轴承、棒条、旋翼、主轴、螺栓、各个表面、机械转带型号以及机械各个组件之间的间隙参数,设计外流式压力机械设备三维模型。通过底面加工、螺纹加工、侧壁加工、正面加工、底面圆角加工、底面尖加工、正面圆角加工实现加工流程。实验结果表明,基于虚拟仿真的外流式压力机械设备的三维设计与加工方法能够有效提高三维模型得到的参数与实际参数的吻合度,降低加工时间。

新型外流式中浓压力筛在苇浆上的应用

介绍了外流式中浓压力筛的工作原理、基本结构、基本参数、实际运行参数及工艺管路安装,详细介绍了外流式中浓压力筛在苇浆上的运行情况及在运行过程中出现的问题及解决的办法,重点强调了压力筛在安装、运行过程中要注意的问题。

国产新型外流式压力筛使用情况探讨

本文介绍了沈阳轻机二厂新一代外流式压力筛的使用情况以及使用效果。

葡萄糖溶液板式外流降膜蒸发布液装置实验研究

以葡萄糖溶液为实验介质 ,比较了筛盘式布液装置和均流板式布液装置的布液性能 ,讨论了影响布液性能的主要因素。实验结果表明 ,均流板式布液装置优于筛盘式 ,其布液均匀 ,成膜稳定 。

外流板式降膜蒸发器的传热性能——人工神经网络方法研究

根据外流板式降膜蒸发器实验装置的传热实验数据，建立了传热元件板片温度分布的人工神经网络模型。在模拟结果的基础上，定义了一个蒸发侧液膜热阻在总热阻中的比率值Ｌｃ，此称为液膜热阻系数Ｌｃ值的分布，清楚地展示了传热元件板片上的热阻分布，并由此得出改善传热的若干启示。

000Cr30Mo2单板可拆式外流自由降膜板式蒸发器在硫化碱生产中的应用

介绍了 0 0 0 Cr30 Mo2材质制造的单板可拆式外流自由降膜板式蒸发器在强腐蚀环境中的应用 ,以及该蒸发器的结构、原理和性能特点。

油田井下外流道式电磁流量计电极的设计研究

油田井下外流道式电磁流量计在油田注水井和注聚井中应用广泛，电极作为电磁流量计的关键部件，它的设计非常重要。电极的设计要考虑的方面非常多，而油田井下被测介质成分又非常复杂，因此应根据具体的井下被测介质成分通过试验来确定与之相匹配的电极材料。

多室板式自由流降膜蒸发器的构造及其计算

本文介绍了多室板自由流降膜蒸发器分室的目的、用途、结构特征和工作原理 。

高合金不锈钢在降膜板式蒸发器上的应用

外流降膜板式蒸发器作为替代列管式蒸发器的新设备应用于氧化铝行业,其板片材质处于一个摸索选择的过程。本文就高合金不锈钢板片的失败事例进行分析,通过试验、试用,最终找到较为理想的材质。

仿真技术在机械设计制造过程中的应用

以外流式压力机械设备的三维设计与加工为例,研究仿真技术在机械设计制造过程中的应用。利用机械设备组件的管端托架、轴承、棒条、旋翼、主轴、螺栓、各表面、机械转带型号以及机械各个组件之间的间隙参数,设计外流式压力机械设备三维模型。通过底面加工、螺纹加工、侧壁加工、正面加工、底面圆角加工、底面尖加工、正面圆角加工实现加工流程。实验结果表明,虚拟仿真技术能够有效改进机械设备的设计与加工,为机械制造领域提供有益的参考。

套管井分层流量测井技术及其应用

监测注水井的注入剖面是油田开发中的一项重要工作。针对特高含水油田存在大孔道和注聚合物等问题,探索应用WDL-C型外流式电磁流量计录取注入剖面资料,该方法不受注入流体性质的影响,能够准确测量分层绝对流量。通过近200口井的矿场应用,该方法可以实现点测及连续流量测井,获取可靠的注入剖面资料,在认识注聚剖面、堵水调剖及井况监测等方面发挥重要作用。

锥阀空化现象研究及结构优化

为研究锥阀空化现象,运用ANSYS Fluent流体力学有限元计算软件,分析锥阀在内流和外流两种情形下的流场,得到锥阀在内流和外流两种流动方式下空化区域0~3s内气体的体积分数。计算对比发现,在液体流速和压力的突变区域空化现象明显,外流较内流空化区域大,空化程度比内流严重。为降低空化现象对锥阀型腔造成的损伤,优化锥阀型腔阀芯结构,优化模型1可避免内流时空化的发生,优化模型2在内流和外流情况下均能有效避免空化的发生,优化模型2的结构形式更为合理。研究成果可为锥阀设计提供参考。

电磁流量计测井在注入剖面测井中的应用

注入剖面测井是油气藏开发中的重要监测技术,充分发挥注入剖面测井资料解释的作用,可解决油藏、地质、工程等多方面的问题。结合直读外流式电磁流量测井资料应用实例,说明了该方法能为油田开发录取到更加准确可靠的注入剖面资料。可以在油田注采系统完善及油水井措施方案的准确制定等方面发挥重要作用,从而拓宽了注入剖面测井资料的应用领域。

The Interaction of Ribavirin and DII-18-2 with RNA

The aim of this study was to investigate the interaction between polymers polyApolyU (RNA) and two general anti-viral drugs with anti-HIV-1 activities. Tm experiment showed that the compounds had interacted with RNA, and CD spectra also observed the changes of RNA conformation induced by the compounds. Cytometric flow analysis indicated that ribavirin and DII-18-2 could decrease the percentage of hypodiploid cells, especially ribavirin.

筛选设备在制浆生产上的应用

针对目前草类浆在制浆生产中筛选设备、流程的更新换代后的成品浆的质量、物耗和废水排放量的比较 ,旧设备与新设备的优缺点 ,通过改造旧设备以适合目前的生产要求 ,提高产品的产量和质量。

Highly efficient differentiation of human ES cells and iPS cells into mature pancreatic insulin-producing cells

Human pluripotent stem cells represent a potentially unlimited source of functional pancreatic endocrine lineage cells. Here we report a highly efficient approach to induce human embryonic stem （ES） cells and induced pluripo- tent stem （iPS） cells to differentiate into mature insulin-producing cells in a chemical-defined culture system. The differentiated human ES cells obtained by this approach comprised nearly 25% insulin-positive cells as assayed by flow cytometry analysis, which released insulin/C-peptide in response to glucose stimuli in a manner comparable to that of adult human islets. Most of these insulin-producing cells co-expressed mature β cell-specific markers such as NKX6-1 and PDX1, indicating a similar gene expression pattern to adult islet β cells in vivo. In this study, we also demonstrated that EGF facilitates the expansion of PDXl-positive pancreatic progenitors. Moreover, our protocol also succeeded in efficiently inducing human iPS cells to differentiate into insuIin-producing ceils. Therefore, this work not only provides a new model to study the mechanism of human pancreatic specialization and maturation in vitro, but also enhances the possibility of utilizing patient-specific iPS cells for the treatment of diabetes.

万吨规模草浆厂黑液碱回收工艺设备选型探讨

草浆厂要生产、生存、发展,必须解决黑液污染问题。本文着重介绍了比较适用的万吨规模草浆厂黑液碱回收的设备选型及工艺条件,供同行参政。

Oscillating Propagation of Kink in Nondissipative Frenkel-Kontorova Chain Due to External DC Force

We report the oscillating propagation of kink in a nondissipative Frenkel-Kontorova （FK） chain driven by external DC force, which is different from the usual propagation of localized modes with equal speed. When the kink moves in the opposite direction of the external DC force, the kink will be accelerated and the potential of the FK chain in the external force field is transformed to be the kinetic energy of the kink. If the kink reaches the boundary of the FK chain, the kink will be bounced back and moves in the opposite direction, then the kink will be decelerated gradually and the kinetic energy of the kink ＆ transformed to be the potential of the FK chain in the external force field. If the speed of the kink reaches zero, the kink will move in the opposite direction again driven by the external DC force, and a new oscillating cycle begins. Simulation result demonstrates exactly the transformation between the kinetic energy of the kink and the potential of the FK chain in the external force field. The interesting energy exchange is induced by the special topology of kinks, and other localized modes, such as breathers and envelope solitons, have no the interesting phenomenon.

The(0,1)Type Green Form of a Complex Projective Space CP^n

In this paper,the(0.1)-form heat kernel of a complex projective space of dimensions n is constructed cxplicitely.As an application of the(0.1)-form heat kernel,the(0.1)type Green Form of CP~

Induction of apoptosis of human ovarian cancer cells by SGI-1776 combination with DDP in sub-toxic concentration in vitro

Objective： The aim of the study was to investigate the effect of SG1-1776 combination with DDP in sub-toxic concentration on induction of apoptosis of human ovarian cancer HO-8910 ceiis in vitro and to unravei the associated mechanisms. Methods： Human ovarian cancer HO-8910 cells were cultured in vitro. The inhibitory effect of SG1-1776 combination with DDP in sub-toxic concentration on induction on viability of human ovarian cancer HO-8910 cells was evaiuated by the MTT assay. Cell apoptosis rate was analyzed by flow cytometry. The proteins expression level related to apoptosis were analyzed by Western blot. Results： SG1-1776 combination with DDP in sub-toxic concentration significantiy inhibited the proliferation of human ovarian cancer HO-8910 cells, and proliferation inhibition rate was increased drastically compared with normai saline （NS） group or DDP group in sub-toxic concentration or SG1-1776 group in sub-toxic concentration （P 〈 0.01）. Apoptosis rate markedly increased after the treatment of SG1-1776 combination with DDP in sub-toxic concentration for 48 h. Western blot showed that the expression of bcl-2 protein was down-regulated and protein level of Bax and Cyto-c were depressed by SG1-1776 combination with DDP in sub-toxic concentration. Cenclusion： SG1-1776 combination with DDP in sub-toxic concentration could inhibit the cell proliferation and lead to cell apoptosis inhuman ovarian cancer HO-8910 cells, and its mechanism may be related to through mitochondrial apoptotic pathway.