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Evolution of Mechanical Properties of Ti–6Al–4V Alloy in the Temperature Range of 20 to − 196 °C
Wei Zhao,Wenjia Su,Liang Li,Ding Fang,Ni Chen 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.9
Cryogenic cooling is becoming an attractive method for machining difficult-to-cut materials to extend their machinability. However, it’s a challenging task to analyze the effect of cryogenic cooling on the machining. In order to better understandthe various physical phenomena in the cryogenic cutting process, cryogenic impact test, and tensile test of titanium alloyTi–6Al–4V were undertaken in this work. The impact and tensile properties of Ti–6Al–4V alloy in the temperature range of20 to − 196 °C were investigated. Later on, the macroscopic and microscopic morphology of the produced fractures wereanalyzed. Findings have depicted a decreasing impact toughness and an increase of tensile and yield strength of Ti–6Al–4Valloy in the temperature range from 20 to − 196 °C. The impact fracture appeared as a tendency of becoming material brittle. Meanwhile, three kinds of zones of shear-lip, fiber, and radiation were found on the fracture morphology. Those zonescorrespond to the shear fracture zone, crack initiation zone, and crack extension zone, respectively. With the temperaturedecrease, the proportion of fiber zone was decreased, while a gradual increase in the radiation zone was observed. Besides,the fiber zone was observed for the macroscopic morphology of the fracture under the temperature of − 196 °C. Somedimples were found in the tensile fracture at − 196 °C indicating the ability of Ti–6Al–4V alloy to deform plastically undersuch low temperature. This work is a fundamental support to analyze the behavior of Ti–6Al–4V alloy under cryogeniccooling conditions.
The effect of Zn(2+) on Pelodiscus sinensis creatine kinase: unfolding and aggregation studies.
Wang, Su-Fang,Lee, Jinhyuk,Wang, Wei,Si, Yue-Xiu,Li, Caiyan,Kim, Tae-Rae,Yang, Jun-Mo,Yin, Shang-Jun,Qian, Guo-Ying Adenine Press 2013 Journal of biomolecular structure & dynamics Vol.31 No.6
<P>We studied the effects of Zn(2+) on creatine kinase from the Chinese soft-shelled turtle, Pelodiscus sinensis (PSCK). Zn(2+) inactivated the activity of PSCK (IC(50)?=?.079??.004?mM) following first-order kinetics consistent with multiple phases. The spectrofluorimetry results showed that Zn(2+) induced significant tertiary structural changes of PSCK with exposure to hydrophobic surfaces and that Zn(2+) directly induced PSCK aggregation. The addition of osmolytes such as glycine, proline, and liquaemin successfully blocked PSCK aggregation, recovering the conformation and activity of PSCK. We measured the ORF gene sequence of PSCK by rapid amplification of cDNA end and simulated the 3D structure of PSCK. The results of molecular dynamics simulations showed that eight Zn(2+) bind to PSCK and one Zn(2+) is predicted to bind in a plausible active site of creatine and ATP. The interaction of Zn(2+) with the active site could mostly block the activity of PSCK. Our study provides important insight into the action of Zn(2+) on PSCK as well as more insights into the PSCK folding and ligand-binding mechanisms, which could provide important insight into the metabolic enzymes of P. sinensis.</P>
Zheng, Wei,Xu, Yuan-Ji,Qiu, Su-Fang,Zong, Jing-Feng,Huang, Ling-Ling,Huang, Chao-Bin,Lin, Shao-Jun,Pan, Jian-Ji Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10
Background: To explore the independent prognostic factors for the recurrence/metastasis of patients with locoregionally advanced nasopharyngeal carcinoma (LANPC). Materials and Methods: A total of 604 patients initially diagnosed as LANPC by pathohistology in Fujian Provincial Cancer Hospital were selected to analyze the relationship between the clinical pathological patterns, therapeutic protocols and clinical stages with the recurrence/metastasis of LANPC. Results: The 1-, 3- and 5-year locoregionally recurrent rates of LANPC patients were 2.0%, 9.5% and 12.9% respectively, with average recurrent period being 78 months. Univariate analysis results indicated that clinical stages had certain influence on the recurrent period of LANPC patients. However, COX regression models showed that ages, genders and clinical stages were not the independent prognostic factors influencing the recurrence. The 1-, 3- and 5-year metastatic rates of LANPC patients were 6.6%, 17.5% and 18.8% respectively, with average metastatic period of 73 months. Univariate analysis results demonstrated that ages, N stages, clinical stages, locations of lymph node, retropharyngeal lymph node and extracapsular invasion of lymph node had certain influence on the metastatic period of LANPC patients. Additionally, further COX regression analysis results suggested that T stages, reduction protocols and extracapsular invasion of lymph node were the independent prognostic factors influencing the metastasis of patients with LANPC, in which T stages and extracapsular invasion of lymph node were the pestilent factors while reduction protocols the protective factor. Conclusions: Induction chemotherapy is beneficial to LANPC patients with initial treatment, and the metastatic rate decreases greatly after the application of reduction chemotherapy.
Yu-Yu Ko,Su-Chen Fang,Wei-Chien Huang,Ming-Chyi Huang,Hu-Ming Chang 대한신경정신의학회 2024 PSYCHIATRY INVESTIGATION Vol.21 No.2
Objective The Penn Alcohol Craving Scale (PACS) is a five-item, single-dimension questionnaire that is used to measure a patient’s alcohol craving. We sought to develop the Chinese version of the PACS (PACS-C) and assess its reliability and validity.Methods A total of 160 Taiwanese patients with alcohol use disorder were enrolled in this study. The internal consistency and concurrent validity of the PASC-C with the visual analogue scale (VAS) for craving, the Yale–Brown Obsessive Compulsive Scale for heavy drinking (YBOCS-hd), and the Severity of Alcohol Dependence Questionnaire (SADQ) were assessed. The test–retest reliability of the PASC-C was evaluated 1 day after the baseline measurements. Confirmatory factor analysis (CFA) was performed to examine the psychometric properties of the PACS-C.Results The PACS-C exhibited good internal consistency (Cronbach’s α=0.95) and test–retest reliability (r=0.97). This scale showed high correlations with the VAS (r=0.81) and YBOCS-hd (r=0.81 and 0.79 for the obsession and compulsion subscales, respectively), and moderate correlation with the SADQ-C (r=0.47). Furthermore, CFA results revealed that the PACS-C had good fit indices under various models.Conclusion The PACS-C appears to be a reliable and valid tool for assessing alcohol craving in patients with alcohol use disorder in Taiwan.
Cui, Xiao-Bin,Peng, Hao,Li, Su,Li, Ting-Ting,Liu, Chun-Xia,Zhang, Shu-Mao,Jin, Ting-Ting,Hu, Jian-Ming,Jiang, Jin-Fang,Liang, Wei-Hua,Li, Na,Li, Li,Chen, Yun-Zhao,Li, Feng Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.22
Background: A number of studies have identified a shared susceptibility locus in phospholipase C epsilon 1 (PLCE1) for esophageal squamous cell carcinoma (ESCC) and gastric cardia adenocarcinomas (GCA). However, the results of PLCE1 expression in esophageal and gastric cancer remain inconsistent and controversial. Moreover, the effects on clinicopathological features remain undetermined. This study aimed to provide a precise quantification of the association between PLCE1 expression and the risk of ESCC and GCA through meta-analysis. Materials and Methods: Eligible studies were identified from PubMed, Wanfang Data, ISI Web of Science, and the Chinese National Knowledge Infrastructure databases. Using RevMan5.2 software, pooled odds ratios (ORs) with 95% confidence intervals (CIs) were employed to assess the association of PLCE1 expression with clinicopathological features relative to ESCC or GCA. Results: Seven articles were identified, including 761 esophageal and gastric cancer cases and 457 controls. Overall, we determined that PLCE1 expression was associated with tumor progression in both esophageal cancers (pooled OR=5.93; 95%CI=3.86 to 9.11) and gastric cancers (pooled OR=9.73; 95%CI=6.46 to 14.7). Moreover, invasion depth (pooled OR=3.62; 95%CI=2.30 to 5.70) and lymph node metastasis (pooled OR=4.21; 95%CI=2.69 to 6.59) were linked with PLCE1 expression in gastric cancer. However, no significant associations were determined between PLCE1 overexpression and the histologic grade, invasion depth, and lymph node metastasis in esophageal cancer. Conclusions: Our metaanalysis results indicated that upregulated PLCE1 is significantly associated with an increased risk of tumor progression in ESCC and GCA. Therefore, PLCE1 expression can be appropriately regarded as a promising biomarker for ESCC and GCA patients.
SF?와 제조공기(I-Air)의 압력별 절연파괴특성 비교
이창욱(Chang-Wook Lee),김영수(Young-Su Kim),方亞偉(Ya-Wei Fang),이창훈(Chang-Hun Lee),김도석(Do-Seok Kim),常超(Chao Chang),최은혁(Eun-Hyuck Choi),임창호(Chang-Ho Lim),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2006 한국조명·전기설비학회 학술대회논문집 Vol.2006 No.11월
본 연구는 현재 전력설비에 사용되고 있는 SF?가스의 대체 절연가스로 제조공기(Ⅰ-Air)의 절연파괴특성 연구를 위하여 모의 GIS 챔버와 AC 300[㎸] 전원장치로 교류전압을 인가하여 연구를 수행하였다. 침 전극 대 평판전극을 이용하여 SF?가스와 I-Air의 절연내력을 비교하기 위해서 3, 4 및 5[atm]까지 가스의 압력변화를 주었고 각 압력별 전극간거리(d)에 따른 절연파괴전압(V<SUB>B</SUB>)을 연구하였다.
Ji Cheng Zhang,Jin Hua Wang,Jun Yi Liu,Qi Wei Guo,Jia Lin,Yi Lin Shen,Ke Xin Jia,Jia Jing Cai,Guo Ming Su,Ding Zhi Fang 대한신경정신의학회 2023 PSYCHIATRY INVESTIGATION Vol.20 No.11
Objective To verify effects of rs1061622 at tumor necrosis factor-α receptor II (TNF-RII) gene (<i>TNF-RII</i>) on post-traumatic stress disorder (PTSD) and its interactive effects with PTSD on serum lipids levels in adolescents.Methods PTSD was measured by PTSD Checklist-Civilian Version (PCL-C) in 699 adolescent survivors at 6 months after Wenchuan earthquake in China. A polymerase chain reaction and restriction fragment length polymorphism assay were utilized for <i>TNF-RII</i> rs1061622 genotyping followed by verification using DNA sequencing. Serum triglycerides (TG), total cholesterol (TC), high-density lipoprotein cholesterol (HDL-C), and low-density lipoprotein cholesterol were tested using routine methods.Results G (deoxyguanine) allele carriers had higher PCL-C scores than TT (deoxythymidine) homozygotes in female subjects. Female adolescents had higher PCL-C scores than male subjects in TT homozygotes. Predictors of PTSD prevalence and severity were different between G allele carriers and TT homozygotes. Subjects with PTSD had lower TG, TG/HDL-C, TC/HDL-C, and higher HDL-C than adolescents without PTSD in male G allele carriers. G allele carriers had higher TG/HDL-C and TC/HDL-C than TT homozygotes in male adolescents without PTSD, and lower TG and TG/HDL-C in male PTSD patients. G allele carriers had higher TG than TT homozygotes only in female adolescents without PTSD.Conclusion These results suggest reciprocal actions of <i>TNF-RII</i> rs1061622 with other factors on PTSD severity, interplays of <i>TNF-RII</i> rs1061622 with PTSD on serum lipid levels, and novel treatment strategies for PTSD and comorbidities of PTSD with hyperlipidemia among adolescents with different genetic backgrounds of <i>TNF-RII</i> rs1061622 after experiencing traumatic events.