Effect of Al element in Zn-Al fillers on the corrosion resistance of Cu/Al brazed joints

Junlan Huang,Weimin Long,Sujuan Zhong 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.2

In this paper, we describe experimental torch welding 1061 aluminum alloy to T2 copper. The corrosion behavior and performance of Cu/Al brazed joints were systematically investigated. This investigation was conducted using an optical microscope (OM), scanning electron microscope (SEM), energy disperse spectroscopy (EDS) and other methodologies. The results showed that the corrosion resistance of brazed joints was closely associated with Al content in filler metal. The corrosion behavior in 3.5 % NaCl solution belonged to microelectrochemical corrosion and depended mainly on electrochemical imbalance between different phases. The excessive dissolution of Al atoms led to the occurrence of the corrosion of brazed joints and the corrosion product may be Al(OH) 3 , Zn(OH) 2 and ZnO. It can be also found that an increase of aluminum content controlled largely formation and distribution of α-Al phase and Al 2 O 3 protective film in brazing alloys, resulting in reducing the electrochemical corrosion current density and improving the corrosion resistance and shear strength of the joint.

崔致远、张乔送别诗比较研究

Zhang, Junlan 부산대학교 중국연구소 2019 Journal of China Studies Vol.22 No.1

During the process of comparing the farewell poems of Qiao Zhang, the poet during the late Tang dynasty, and Choi Chi-Won, the Silla poet, we can not only see the similarities and differences in farewell poems, but also the traits of the cultural communications between Silla and Tang dynasty. This article has compared the objects, forms and content of the fare poems of the two people. By connecting their social background, they have similarities and unique styles in creating farewell poems. The farewell objects of the farewell poems of Choi Chi-Won and Qiao Zhang are very diverse. By analyzing the identities of Silla people-the objects of Qiao Zhang’s farewell poems, including literati, monks and envoys, the literati, monks and envoys in this period play a very important role in the cultural communication of the two countries. Choi Chi-Won and Qiao Zhang are all good at using allusions during the process of creating farewell poems. Besides, the scope involved in is very broad. From the precise and broad application of allusions, it can be seen that the two people both have high literary attainments and outstanding creation capacity. From the poems, forms, the usage and options of the poems, it can be seen the characteristics of the two people in creating the farewell poems. Qiao Zhang appears more reserved and euphemistic in expressing emotions and Choi Chi-Won is more bold, unconstrained and direct. The forms of the titles of the poem of Qiao Zhang appear more single, most of which are of the five-character verse and pay attention to the natural sequencing of the scenery, in order to render the feeling of separation. The title of the poems of Choi Chi-Won is diverse, most of which are of the seven-character quatrain and are commonly used the ingenious numbers, or empty words and reiterative words.

The Comparative Studies on Farewell Poems between Choi Chi-Won and Qiao Zhang

Zhang, Junlan 부산대학교 중국연구소 2019 Journal of China Studies Vol.22 No.1

Risk of Death in Colorectal Cancer Patients with Multi-morbidities of Metabolic Syndrome: A Retrospective Multicohort Analysis

Qingting Feng,Lingkai Xu,Lin Li,Junlan Qiu,Ziwei Huang,Yiqing Jiang,Tao Wen,Shun Lu,Fang Meng,Xiaochen Shu 대한암학회 2021 Cancer Research and Treatment Vol.53 No.3

Purpose The prevalence of multi-morbidities with colorectal cancer (CRC) is known to be increasing. Particularly prognosis of CRC patients co-diagnosed with metabolic syndrome (MetSyn) was largely unknown. We aimed to examine the death risk of CRC patients according to the multiple MetSyn morbidities.Materials and Methods We identified CRC patients with MetSyn from the electronic medical records (EMR) systems in five independent hospitals during 2006-2011. Information on deaths was jointly retrieved from EMR, cause of death registry and chronic disease surveillance as well as study-specific questionnaire. Cox proportional hazards regression was used to calculate the overall and CRC-specific hazards ratios (HR) comparing MetSyn CRC cohort with reference CRC cohort.Results A total of 682 CRC patients in MetSyn CRC cohort were identified from 24 months before CRC diagnosis to 1 month after. During a median follow-up of 92 months, we totally observed 584 deaths from CRC, 245 being in MetSyn cohort and 339 in reference cohort. Overall, MetSyn CRC cohort had an elevated risk of CRC-specific mortality (HR, 1.49; 95% confidence interval [CI], 1.07 to 1.90) and overall mortality (HR, 1.43; 95% CI, 1.09 to 1.84) compared to reference cohort after multiple adjustment. Stratified analyses showed higher mortality risk among women (HR, 1.87; 95% CI, 1.04 to 2.27) and specific components of MetSyn. Notably, the number of MetSyn components was observed to be significantly related to CRC prognosis.Conclusion Our findings supported that multi-morbidities of MetSyn associated with elevated death risk after CRC. MetSyn should be considered as an integrated medical condition more than its components in CRC prognostic management.

신기능성 물질 탐색을 위한 침엽수잎의 특수성분 분석에 관한 연구 (Ⅰ) : 펙틴, 탄닌, 테르페노이드의 분석 Analysis of Pectin, Tannin and Terpenoids

황병호,이현종,강하영,유순희,조재현,조국란 江原大學校 森林科學硏究所 1997 Journal of Forest Science Vol.13 No.-

요 약 주요 소나무류잎의 특수성분을 분석하여 시판되고 있는 솔잎 가공식품의 기초데이터를 제공함과 동시에 임산화학 분야의 학문적 기초데이터를 축적하기 위하여 실시한 결과, 펙틴은 잣나무가 가장 높게 분석되었으며, 탄닌은 잣나무가 높게 분석되었고, 소나무와 해송은 유사하였다. 테르페노이드 성분중 α-pinene은 소나무와 잣나무에서, β-pinene은 리기다와 해송에서 높게 분석되었으며, 희귀성분으로는 잣나무에서 sabinene과 citronellol, 리기다에서는 α-pinene oxide 등이 분석되었다. 특히 소나무일체 다량 존재하는 성분은 α-pinene, β-caryophyllene, β-phellandrene, Δ3-carene, phytol 등 이었다. 향기성분의 주체인 α-pinene, limonene, bornylacetate들이 소나무와 잣나무에서 보다 많이 분석된 것으로 보아 삼림욕의 상쾌한 내용의 주체성분이라고 생각된다. ABSTRACT Pectin and tannin analysis were carried out to inverstigate any available components from Pinus densiflora, koraiensis, P. thunbergii and P. rigida. To analyze terpenoid components, the essential oils were extracted with steam distillation method from four kinds of pine needles. The essential oil was analyzed by GC and GC-MS spectroscopy.The results were summarized as follows: Pectin content was highest in P. koraiensis with 0.40%, and tannin content was highest in P koraiensis with 1.05. Major components of P. densiflora needles were α-pinene, β-caryophyllene, Δ3-carene and phytol. α-Pinene, Δ3-carene, β-caryophyllene, germacrene D, and camphene were found major components n P. koraiensis. Major components of P. thunbergii needles were β-pinene, α-pinene, β-caryophyllene and germacrene D. β-Pinene, α-pinene, humulene oxide and α-elemene were major components in P. rigida. Sabinene and citronellol were infrequent components in P. Koraiensis, and α-pinene oxide was present only in P. rigida. α-Pinene, limonene, and bornylacetate well known as the mail components of green air bath were found in P. densiflora and P. koraiensis.

Inhibition of glutathione metabolism attenuates esophageal cancer progression

Liang Peng,Ruixia Linghu,Demeng Chen,Jing Yang,Xiaoxue Kou,Xiang-Zhen Wang,Yi Hu,Yi-Zhou Jiang,Junlan Yang 생화학분자생물학회 2017 Experimental and molecular medicine Vol.49 No.-

Esophageal squamous cell carcinoma (ESCC) is a deadly malignancy with regard to mortality and prognosis, and the 5-year survival rate for all patients diagnosed with ESCC remains poor. A better understanding of the biological mechanisms of ESCC tumorigenesis and progression is of great importance to improve treatment of this disease. In this study, we demonstrated that the glutathione metabolism pathway is highly enriched in ESCC cells compared with normal esophageal epithelial cells in an in vivo mouse model. In addition, treatment with L-buthionine-sulfoximine (BSO) to deplete glutathione decreased the ESCC tumor burden in mice, thus demonstrating the critical role of glutathione metabolism in ESCC progression. BSO treatment also led to decreased cell proliferation and activation of cell apoptosis in ESCC. Finally, BSO treatment blocked NF-kB pathway activation in ESCC. Our study reveals a new pathway that regulates ESCC progression and suggests that inhibition of glutathione metabolism may be a potential strategy for ESCC treatment