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Xu Hui-jun 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.7
Because of its high heat transfer efficiency, compact structure and many kinds of heat transfer characteristics, the plate fin heat exchanger has been widely used in the field of natural gas liquefaction. The interior of the plate fin heat exchanger, mainly composed of many small rectangular channels, and the heat transfer of hydrocarbon mixed refrigerant in the interior. For the research on the rectangular of hydrocarbon mixed refrigerant flow boiling and heat transfer in the minichannels of plate fin heat exchanger, explore the related mechanism of hydrocarbon mixed refrigerant boiling flow and heat transfer in the interior, which will assist in liquefied natural gas field of plate fin heat exchanger thermal performance design; at the same time, it is also driven by the China natural gas liquefaction systems for large thermal equipment, improve the energy saving of heat equipment or system is the key.
Xu, Xiao-Hua,Peng, Xue-Hong,Yu, Ping,Xu, Xiao-Yuan,Cai, Er-Hui,Guo, Pi,Li, Ke Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1
Neoadjuvant chemotherapy for resectable esophageal carcinoma has been a focus of study, but no agreement has been reached on clinical randomized controlled trials and relevant systematic evaluation. The purpose of this study was to perform a meta-analysis on published randomized controlled trials (RCTs) that compared neoadjuvant chemotherapy and surgery with surgery alone for resectable esophageal carcinoma. Medline and manual searches was conducted in PubMed, ASCO (American Society of Clinical Oncology) meeting summary, Embase, the Cochrane Library (up to October 2010), Chinese Biomedical Literature Database, China National Knowledge Infrastructure, VIP Database, Wanfang Database. The selection contents were to identify all published and unpublished RCTs that compared neoadjuvant chemotherapy and surgery with surgery alone for resectable esophageal carcinoma. Sixteen RCTs which included 2,594 patients were selected. The risk ratio (RR) (95% confidence interval [CI]; P value), expressed as neoadjuvant chemotherapy and surgery versus surgery alone (treatment versus control), was 1.02 (0.95, 1.10; P=0.54) for 1-year survival, 1.29 (1.13, 1.47; P=0.0001) for 3-year survival, 1.31 (1.13, 1.51; P=0.0003) for 5-year survival, 1.00 (0.95, 1.04; P= 0.85) for rate of resection and 0.89 (0.64, 1.23; P=0.48) for operative mortality. The results showed that neoadjuvant chemotherapy for resectable esophageal carcinoma can raise the overall survival rate of patients with esophageal carcinoma, but it does not affect treatment-related mortality.
Xu, Han-Feng,Chen, Lei,Liu, Xian-Dong,Zhan, Yun-Hong,Zhang, Hui-Hui,Li, Qing,Wu, Bin Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.7
Renal cell carcinoma (RCC) is the most lethal of all urological cancers and tumor angiogenesis is closely related with its growth, invasion, and metastasis. Recent studies have suggested that epidermal growth factor-like domain multiple 7 (EGFL7) is overexpressed by many tumors, such as colorectal cancer and hepatocellular carcinoma; it is also correlated with progression, metastasis, and a poor prognosis. However, the role of EGFL7 in RCC is not clear. In this study, we examined how EGFL7 contributes to the growth of RCC using a co-culture system in vitro and a xenograft model in vivo. Downregulated EGFL7 expression in RCC cells affected the migration and tubule formation of HMEC-1 cells, but not their growth and apoptosis in vitro. The level of focal adhesion kinase (FAK) phosphorylation in HMEC-1 cells decreased significantly when co-cultured with 786-0/iEGFL7 cells compared with 786-0 cells. After adding rhEGFL7, the level of FAK phosphorylation in HMEC-1 cells was significantly elevated compared with phosphate-buffered saline (PBS) control. However, FAK phosphorylation was abrogated by EGFR inhibition. The average size of RCC local tumors in the 786-0/iEGFL7 group was noticeably smaller than those in the 786-0 cell group and their vascular density was also significantly decreased. These data suggest that EGFL7 has an important function in the growth of RCC by facilitating angiogenesis.
Hui Xu,Yichun Zhang,Bin Rong 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.3
In this study, a combination of experiments and fi nite element analyses was conducted to investigate the eff ect of initial imperfections on the axial compression of the 7A04-T6 aluminum alloy columns. Prior to the loading tests, measurement of the initial geometric imperfections for the columns were performed by optical theodolite and vernier calipert. The failure modes of 10 extruded circular columns were investigated. Meanwhile, the ultimate strengths, defl ections and surface strains in whole process under axial compression were recorded. The fi nite element (FE) models of the tested columns were developed using the non-linear fi nite element analysis (FEA) software ABAQUS, and the imperfections and material nonlinearities were considered in the FE models. The validation of the FE models was performed against the test results; it was observed that the proposed FE models are suffi ciently accurate to predict the ultimate strengths and buckling behaviors of the tested columns.
An Integrated Approach for Monitoring Service Level Parameters of Software-Defined Networking
Hui Xu,Hongwei Chen 보안공학연구지원센터 2015 International Journal of Future Generation Communi Vol.8 No.6
Software-Defined Networking (SDN) is a new-generation network that decouples the control plane and the data plane, and an additional management plane still lacks a mature implementation solution. In this case, monitoring service level parameters is of great significance to study issues related to service management for SDN. This paper then aims to apply the queuing theory and the extension theory to monitor service level parameters of SDN and propose an integrated approach based on both two theories from the formalization point of view. Simulation result and scenario analysis validate that, the proposed integrated approach prospects a feasible way of formalizing the solution to monitor service level parameters of SDN.
Xu, Wei,Ma, Wei-Wei,Zeng, Hui-Hui Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.17
Background: In this study, we aimed to evaluate the growth inhibitory effect of the combination of ethaselen (BBSKE) and low fixed dose of selenite against A549 human non-small cell lung cancer cells in vitro. Materials and Methods: Growth inhibitory effects against A549 cells were determined by SRB assay. Combination index (CI) values were calculated based on Chou-Talalay median-effect analyses. Dose reduction index (DRI) values were applied to calculate dose reduction of selenite. Contents of free thiols and GSH were determined by DTNB assay and intracellular ROS levels by DCFH-DA fluorescence labeling. Results: Compared with BBSKE or selenite single treatment, the combined application of ethaselen and a low fixed dose of selenite shortened the onset time of sodium selenite, reduced $IC_{50}$ values, and increased the maximum inhibition rates, suggesting a possible molecular mechanism of the synergism. Obvious synergistic effects were observed after different times of combination treatment, especially after 24 h. Compared with selenite single treatment, dosage of selenite could be remarkably reduced in combination therapy to gain the same inhibitory effect on cell proliferation. Compared with BBSKE single treatment, the content of free thiols and GSH were significantly reduced and ROS levels greatly elevated in the combination group. For the combination treatment, cell viability increased as greater concentrations of GSH were added. Conclusions: All these results indicate that the combination treatment of BBSKE and selenite showed synergism to inhibit A549 cell proliferation in vitro, and also reduced the selenite dosage to mitigate its toxicity which is very meaningful for combination chemotherapy of lung cancer. The synergism was probably caused by the accelerated exhaustion of intracellular reductive substances, such as free thiols and GSH, which ultimately leads to enhanced oxidative stress and apoptosis.
Hui-hui Xie,Lin Chen,Fa-qing Xu,Wan-sheng Guo,Shui Wang,Zhong-Nan Yang,Sen Zhang 한국식물학회 2017 Journal of Plant Biology Vol.60 No.4
Pollen exine, mainly composed of sporopollenin,plays important roles during microspore development. It hasbeen reported that Acyl-CoA Synthetase5 (ACOS5) is requiredfor sporopollenin biosynthesis in Arabidopsis. Here we showthat ACOS5 is essential for primexine formation duringArabidopsis microspore development. Through genetic screen,we identified a point mutation of ACOS5 allele, acos5-2,showing abnormal microspore development. Its microsporeswere degenerated and aborted after released from the tetrads. Transmission electron microscopy showed that primexineformation was reduced in acos5-2 mutant as compared tothat of the wild-type. Consequently, sporopollenin wasaggregated and randomly deposited on the microspores. Insitu hybridization indicated that the key regulators of tapetumdevelopment, DYT1 and TDF1, are required for the expressionof ACOS5 in tapetum. Furthermore, the GUS reporter showedthat the 593-bp promoter sequence was sufficient for theexpression of ACOS5 in the anther. Our data provide evidencethat ACOS5 is required for primexine formation andsporopollenin deposition during microspore development.