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  • Author: Yong-jian Wang x
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Hou-lin Liu, Jian Wang, Yong Wang, Hua Zhang and Haoqin Huang

Abstract

The phenomenon of cavitation is an unsteady flow, which is nearly inevitable in pump. It would degrade the pump performance, produce vibration and noise and even damage the pump. Hence, to improve accuracy of the nu¬merical prediction of the pump cavitation performance is much desirable. In the present work, a homogenous model, the Zwart-Gerber-Belamri cavitation model, is considered to investigate the influence of the empirical coefficients on predicting the pump cavitation performance, concerning a centrifugal pump. Three coefficients are analyzed, namely the nucleation site radius, evaporation and condensation coefficients. Also, the experiments are carried out to validate the numerical simulations. The results indicate that, to get a precise prediction, the approaches of declining the initial bubble radius, the condensation coefficient or increasing the evaporation coefficient are all feasible, especially for de¬clining the condensation coefficient, which is the most effective way.

Open access

Jiu-chuan Lin, Yong-jian Wang, Rong-rong Xi, Lei Cui and Zhi-yu Hao

Open access

Zhang Yong, Liping Wang, Jian Chen and Yongze Zhuang

Abstract

Background: Antiphospholipid antibodies (aPL) are associated with an increased risk of venous thrombosis and can occur in patients without any associated conditions, or in those with autoimmune disorders, such as systemic lupus erythematosus (SLE). Mesenteric venous thrombosis (MVT) is one of the clinical manifestations of antiphospholipid syndrome (APS), and it has rarely been reported in patients with SLE.

Objective: To report a case of SLE complicated by APS and MVT.

Method: A 28-year-old woman with a history of SLE and lupus nephritis was admitted with nonspecific abdominal symptoms. The working diagnosis was severe SLE and paralytic ileus because of primary peritonitis.

Result: Nine days after she did not respond to symptomatic treatment, exploratory laparotomy revealed MVT and further coagulation work-up was diagnostic for APS. Despite treatment, she died because of complications of SLE and APS.

Conclusion: Though rare, MVT should be considered in patients with SLE and/or APS. The diagnosis of MVT requires a high index of suspicion, and early aPL testing for SLE patients is highly recommended to reduce the morbidity and mortality associated with the condition.

Open access

Ya-Li Liu, Yao-Zhong Ding, Jun-Fei Dai, Bing Ma, Ji-Jun He, Wei-Min Ma, Jian-Liang Lv, Xiao-Yuan Ma, Yun-Wen Ou, Jun Wang, Yong-Sheng Liu, Hui-Yun Chang, Yong-Lu Wang, Qiang Zhang, Xiang-Tao Liu, Yong-Guang Zhang and Jie Zhang

Abstract

Introduction

The extremely high genetic variation and the continuously emerging variants of foot-and-mouth disease virus (FMDV) of Southern African Territory (SAT) serotypes including SAT1, SAT2, and SAT3 make it necessary to develop a new RT-PCR for general use for monitoring viruses based on the updated genome information.

Material and Methods

A FMDV SAT-D8 one-step RT-PCR was established based on the 1D2A2B genes of the SAT serotype viruses with a multiplex primer set. FMDV A, O, C, and Asia 1 serotypes, other vesicular disease viruses, inactivated SAT viruses, and 125 bovine, ovine, caprine and porcine tissue samples collected from the Chinese mainland were included for evaluating the assay.

Results

The new RT-PCR was proven to be specific without cross-reactions with Eurasian FMDV, swine vesicular disease virus (SVDV), Seneca valley virus (SVV), or other common viral pathogens of cattle, sheep, goat, and pig. An around 257 bp-sized amplicon clearly appeared when the inactivated SAT viruses were detected. However, all 125 samples collected from FMDV-susceptible animals from the Chinese mainland which has not known SAT epidemics showed negative results.

Conclusions

A FMDV SAT-D8 one-step RT-PCR is a promising method for primary screening for FMDV SAT serotypes.