VPF

The mechanical properties of viscous medium are one of main factors in VPF .

粘性介质的力学性能是粘性介质压力成形的主要影响因素，目前还缺少深入的理解和材料模型。

A New Technology of Viscous Pressure Forming ( VPF ) of Sheet Parts

板件粘性介质压力成形新工艺

Cost accounting system based on VPF

基于VPF数据库开发成本核算系统

Research on Viscous Pressure Forming ( VPF ) of Aluminum Alloy Ladder Parts

铝合金阶梯形件粘性介质压力成形的研究

Experimental research for viscous pressure forming ( VPF ) of hemispherical part is presented in this paper .

本文对半球形件的粘性介质胀形进行了实验研究。

Objective To study the expression and significance of vascular permeability factor ( VPF ) in nasal polyps .

目的探讨血管通透性因子（vascularpermeabilityfactor，VPF）在鼻息肉组织中的表达及意义。

Viscous pressure forming ( VPF ), a recently developed process , is an advanced approach in sheet metal forming .

粘性压力成形技术是金属板材成形领域里新近出现的一种先进的加工工艺。

Control on blank holder pressure ( BHP ) during viscous pressure forming ( VPF ) thin-walled sheet metal parts

薄板件粘性介质压力成形过程的压边力控制

Compared with multi stage rigid punch forming , aluminum alloy ladder sheet part can be formed in one stage with VPF ;

对于采用多道次刚模拉深成形的铝合金阶梯形板件，可以一次拉深成形；

A qualitative analysis on energy saving for VPF is made in this paper , points out actual saving depends on control mode and appropriate equipment .

对一次冷冻水变频节能效果定性分析，指出实际的节能效果取决于控制方式，而且对系统控制设备的选取也有一定的要求。

Viscous pressure forming ( VPF ) is a good sheet metal forming flexible method to manufacture high strength and difficult-to-form material parts .

粘性介质压力成形（Viscouspressureforming，VPF）适合于高强度难变形材料钣金零件的制造。

The basic principle and characteristics of VPF are described . Influences of viscous medium 's properties on sheet deformation are analyzed by finite element method .

介绍了粘性介质压力成形技术的基本原理，分析了粘性介质压力成形技术的特点，采用有限元方法数值模拟分析了粘性介质性质对板材变形的影响规律；

Conclusion Vascular permeability factor is elevated in patients with OHSS and the ovary may be a source of VPF secretion .

结论VPF在重度OHSS病人中明显升高，卵巢是VPF的重要来源。

Because of the coupled deformation between sheet metal and viscous medium , it is necessary to utilize FEM to analyze VPF .

由于粘性介质压力成形过程板材与粘性介质耦合变形特点，借助有限元分析方法进行分析是十分必要的，但是，现有的有限元方法均不能对这一变形行为进行分析。

In this paper , VPF used for forming automobile door outer with aluminum alloys is investigated , and the investigation used with numerical simulation and experimentation .

本文研究了铝合金车门外板缩比件粘性介质压力成形，采用实验与数值模拟相结合的方法对成形过程和结果进行了分析。

VEGF is termed VPF ( vascular permeability factor ), which is the strongest vascularization factor directly acting to vascular endothelial .

VEGF又称血管渗透因子（VPF），是目前所知道的最强烈的直接作用于血管的内皮细胞生长因子。

Based on study of the process of viscous pressure forming ( VPF ), a finit element method ( FEM ) model was developed to simulate the VPF .

基于粘性压力胀形工艺，建立了薄板粘性压力成形的有限元分析模型。

Viscous pressure forming ( VPF ), a new developed sheet flexible-die forming process , has been playing a good application on sheet metal forming in aerospace industry .

粘性介质压力成形作为一种近年来发展起来的板材软模成形方法，已经在航天等领域得到了较好的应用。

Compared with simulation results with metal punch forming , the necking and wall thickness reduction on smaller radius surface can be avoided or decreased with VPF .

与钢凸模成形相比较，可以避免局部较小半径曲面之间的严重颈缩；

Background : Vascular endothelial growth factor ( VEGF ) also named vascular permeability factor ( VPF ), is an important positive regulator for angiogenesis . This is one target of the anticancer research .

背景：血管内皮生长因子（VascularEndothelialGrowthFactor，VEGF），又名血管通透性因子（vascularpermeabilityfactor，VPF）是重要的血管生成正性调节因子，是目前抗癌治疗的研究靶点之一。

Vascular endothelial growth factor ( VEGF ) is also named as vascular permeability factor ( VPF ), which is a powerful angiogenesis and vascular diosmosis promoter discovered at present .

血管内皮生长因子（VEGF）又称血管通透因子（VPF），是目前发现的一种强有力的血管生成和血管渗透促进因子。

Restore the plug inside the unit by sliding the plug button while pressing it . Control on blank holder pressure ( BHP ) during viscous pressure forming ( VPF ) thin-walled sheet metal parts

边按压边向机内侧滑动，使插头按钮收藏在机内。薄板件粘性介质压力成形过程的压边力控制

In this paper , we advance the variable plaintext function ( VPF ) can be more sensitive to the avalanche effect , as to effectively prevent the differential analysis attack and increase the security of MD5 .

本文主要做了如下的研究工作：1.本文提出的动态明文变化函数来对MD5算法进行修改，能使其产生更敏感的雪崩效应，以此来有效防止差分分析攻击，提高MD5算法的安全性。

Using commercial finite element software Ansys , the numerical simulations of the forming processes of decorated rib and handle , which are key positions in the door outer are conducted and investigated the differences of VPF and tradition forming .

首先采用商用有限元分析软件Ansys对车门成形中的关键部位装饰筋和把手的成形进行了数值模拟，对比分析了粘性介质压力成形与刚性模成形的特点；

Results ( 1 ) The VEGF / VPF positivity in vascular endothelium and in glandular cell was significantly higher in nasal polyps than in middle turbinates ( P < 0.01 and P < 0.05 , respectively );

结果①VEGFVPF在鼻息肉组织的血管内皮细胞和腺体细胞的表达明显高于中鼻甲组织（P<0.01和P<0.05）；

By comparative analysis of VPF , using viscous media for flexible punch , and hydroforming ( HF ), using water for flexible die , some process characteristics in VPF are received , and the application of VPF in vehicle manufacturing is analyzed .

通过粘介质成形（VPF）实验与以水为介质的液压成形（HF）模拟的对比分析，得出了VPF过程中的一些工艺特点，并分析了VPF工艺在飞行器制造中的应用前景。

It was also shown that the formability can be improved with VPF . According to the simulation results , aluminum alloy ladder parts were manufactured successfully with VPF , which verifies that the simulation is as a good tool to guide the experiments .

根据模拟结果，采用VPF成功地制备了阶梯形件，这表明有限元法对VPF试验具有很好的指导意义。

Viscous pressure forming ( VPF ) is suitable for the forming of this kind of parts because of its unique characteristic . The main difference between VPF and the traditional sheet forming technology is that viscous pressure-carrying medium is used in VPF .

粘性介质压力成形（VPF）技术采用一种粘性介质作为传力介质，适合于成形该类零件。

The results showed that parameters Index of Diversity (ⅰ), Variance of Phenotypic Frequency ( VPF ), Variance of Phenotypic Value ( VPV ) and Coefficient of Variation ( CV ) are more effective on evaluating different methods for core collection selection among 8 studied parameters .

结果表明，在所选8个参数中，多样性指数、表型方差、表型频率方差及变异系数为对比不同核心种质取样方法间优劣的有效参数；

Objective To determine whether levels of vascular permeability factor ( VPF ) in serum , peritoneal fluid ( PF ) and follicular fluid ( FF ) are elevated in patients with ovarian hyperstimulation syndrome ( OHSS ) and to determine if ovary may be the source of VPF .

目的了解卵巢过度刺激综合征（OHSS）病人血清、腹腔液（PF）及卵泡液（FF）中血管渗透因子（VascularpermeabilityfactorVPF）水平、明确其来源。