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Microstructure and mechanical properties of Ti/Al/Ti clad plates prepared via powder-in-tube method

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Journal of Iron and Steel Research International 2024年第3期31卷 670-687页

作者： xian-lei Hu Qin-cheng Xie Yi Yuan ying Zhi State Key Laboratory of Rolling and Automation Northeastern UniversityShenyang 110819LiaoningChina Suzhou Dongbao Haixing Metal Material Technology Co. Ltd.Suzhou 215600JiangsuChina School of Material Science and Engineering Northeastern UniversityShenyang 110819LiaoningChina

The Ti/Al/Ti clad plates exhibit a broad spectrum of potential ***,the conventional techniques of hot-pressing composite and explosive composite are intricate and environmentally hazardous.A novel method was introduced for preparing clad plates,namely,the powder-in-tube *** method involves a combination of cold rolling,annealing at a temperature of 550℃,and double *** morphology of the intermetallic compound layer was analyzed through the utilization of interface stripping test,tensile test,and microscopic *** interface morphology,interface bonding properties,tensile fracture structures,and properties of plates under the first and second rolling were compared,along with the effects of intermetallic compounds on the interface *** results indicate that the powder-in-tube method,when annealed at 550℃,can produce a composite plate featuring a complete and uniform Ti/Al *** obtained plate exhibits a peeling strength of 21.5 N/mm,tensile strength of 424 MPa,and elongation of 11.5%.Furthermore,a systematic analysis was conducted to determine the causes of performance degra-dation observed during annealing at temperatures of 600 and 650℃.

关键词： Powder-in-tube method-Ti/Al/Ti clad plate Annealing Cold rolling-Mechanical property

Modulation of Soil Particle Size and Nutrient Availability in the Maize Rhizosheath

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Pedosphere 2011年第4期21卷 483-490页

作者： MA Wei LI Xue-xian LI chun-Jian Department of Plant Nutrition China Agricultural University Beijing 100193 (China)

Root exudates,microorganism colonization and soil aggregates together form the rhizosheath,a special cylinder of micro-ecosystem adhering to the root *** study how the rhizosheath affects soil structure and nutrient distribution,we analyzed the impact of maize rhizosheath on soil particle size and nutrient availability in pot and field *** results showed that there was a significant size decrease of soil particles in the ***,the soil mineral nitrogen in the rhizosheath was significantly higher than that in the rhizosphere or bulk soil at tasseling and maturity stages of *** contents of Fe and Mn were also differentially altered in the *** development,indicated by a dry weight ratio of rhizosheath soil to the root,was relatively independent of root development during the whole experimental *** formation of maize rhizosheath contributed to the modulation of soil particle size and nutrient *** subtle local changes of soil physical and chemical properties may have profound influence on soil formation,rhizospheric ecosystem initiation,and mineral nutrient mobilization over the long history of plant evolution and domestication.

关键词： micronutrient mineral nitrogen mucilage rhizosphere root exudates

Chemiluminescence Sensor for the Determination of Hydroxylamine by Electrostatically Immobilizing Luminol and Periodate

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Chemical Research in Chinese Universities 2003年第2期19卷 155-159页

作者： ZHANG Si chun ZHOU Guo jun JU Huang xian Department of Chemistry Institute of Analytical ScienceState Key Laboratory of Coordination ChemistryNanjing UniversityNanjing 210093P.R.China

A novel chemiluminescence(CL) sensor, which can be used for hydroxylamine determination in combination with flow injection analysis, was developed by electrostatically immobilizing luminol and periodate on anion exchange resin respectively. Hydroxylamine was sensed by its enhancing effect on the weak CL reaction between luminol and periodate, which were eluted from the ion exchange column. The response of the sensor to hydroxylamine was linear in the concentration range of 8.0×10^(-8)-2.0×10^(-6)mol/L with a detection limit of 4.0×10^(-8)mol/L hydroxylamine(3σ).The relative standard deviation(RSD) was 2.0% for 9 repetitive determinations at a hydroxylamine concentration of 5.0×10^(-7) mol/L. The sensor could be reused for over 400 times with a good reproducibility and was used to determine hydroxylamine in wastewater.

关键词： Chemical sensor Chemiluminescence Luminol Periodate Hydroxylamine

Simultaneous removing SO_2 and NO by a new system containing cobalt complex

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Journal of Environmental Sciences 2006年第3期18卷 567-571页

作者： ZHOU chun-qiong DENG xian-he PAN Zhao-qun School of Chemical and Energy Engineering South China University of Technology Guangzhou 510640 China

Absorption and catalytic oxidation of nitric oxide can be achieved by using cobalt（Ⅲ） ethylenediamine （Co（en）3^3＋. When simultaneous absorbing SO2 and NO, the precipitation of Co2（SO3）3 will be yielded and the NO removal will be decreased. A new catalyst system using Co（en）3^3＋ coupled with urea has been developed to simultaneous remove NO and SO2 in the flue gas. NO is absorbed and catalytically oxidized to nitrite and nitrate by Co（en）3^3＋. The dissolved oxygen in scrubbing solution from the feed stream acts as oxidant. Urea restrains the precipitation of Co2（SO3）3 by oxidizing SO3^2-to SO4^2- as COSO4 is more soluble in water. The experimental results proved that nearly all SO3^2- can be oxidized to SO4^2- and the high NO and SO2 removal could be obtained with the new system. The NO removal is influenced by gas flow rate, the concentration of Co（en）3^3＋ and urea in the absorption solution, the temperature of the scrubbing solution and the content of oxygen in the flue gas. The low gas flow rate is favorable to increase the NO removal. The experiments proved that the NO removal could be maintained at more than 95% by the system of 0.02 mol/L Co（en）3^3＋ and 1% urea at 50℃ with 10% O2 in the flue gas.

关键词： simultaneous removing SO2 and NO, Co(en)33+ urea SO32- oxidation

Protocol of Jidong Women Health Cohort Study: Rationale, Design, and Baseline Characteristics

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Biomedical and Environmental Sciences 2019年第2期32卷 144-152页

作者： QIU Meng Si WANG xian Wei YAO Yan GE Si Qi LIU Hua Min DAI ying chun ZHOU Yong Department of Epidemiology School of Public Health Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research) Sanbo Brain Institute Sanbo Brain Hospital Capital Medical University Department of Cardiology Beijing Anzhen Hospital Capital Medical University Department of Neuroepidemiology Beijing Neurosurgical Institute Capital Medical University School of Public Health Taishan Medical University

Objective The Jidong Women Health Cohort Study is a prospective cohort study on female-specific characteristics and risks of chronic diseases in Chinese women and focuses on the potential association between menopause and risks of cardiovascular disease(CVD). Methods The study includes 4,179 female participants with an age of older than 18 years from Caofeidian district, Tangshan city, northern China. Baseline information on female-specific characteristics and potential cardiovascular risk factors was collected and all the participants underwent a physical examination with blood samples collected in 2013. To establish a better risk assessment tool of female CVD, updated information from questionnaire investigation, physical examinations and occurrence of outcome events will be collected through a longitudinal follow-up annually up to the year 2024. Results At baseline, Mean age of the participants was 42.3 ± 12.8 years. Reproduction occurred in 2,948 participants(70.5%), menopausal transition in 173(4.3%), and postmenopause in 1,058(25.3%). The incidence of arterial hypertension, dyslipidemia, and diabetes showed significant difference across different groups stratified by Stage of Reproductive Aging Workshop(STRAW) system(P < 0.05). Conclusion The Jidong Women Health Cohort Study will contribute to the scientific evidence on association between female-specific characteristics and cardiovascular risks, and will also be helpful to provide a new path for early detection and prevention of CVD.

关键词： Cardiovascular disease Menopause Women Protocol Chinese population-based

Parametric estimation for the simple linear regression model under moving extremes ranked set sampling design

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Applied Mathematics(A Journal of Chinese Universities) 2021年第2期36卷 269-277页

作者： YAO Dong-sen CHEN Wang-xue LONG chun-xian Department of Mathematics and Statistics Jishou UniversityJishou 416000China

Cost effective sampling design is a major concern in some experiments especially when the measurement of the characteristic of interest is costly or painful or time *** set sampling(RSS)was first proposed by McIntyre[1952.A method for unbiased selective sampling,using ranked *** Journal of Agricultural Research 3,385-390]as an effective way to estimate the pasture *** the current paper,a modification of ranked set sampling called moving extremes ranked set sampling(MERSS)is considered for the best linear unbiased estimators(BLUEs)for the simple linear regression *** BLUEs for this model under MERSS are *** BLUEs under MERSS are shown to be markedly more efficient for normal data when compared with the BLUEs under simple random sampling.

关键词： simple linear regression model best linear unbiased estimator simple random sampling ranked set sampling moving extremes ranked set sampling

Correlation between expression of human telomerase subunits and telomerase activity in esophageal squamous cell carcinoma

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World Journal of Gastroenterology 2003年第11期9卷 2395-2399页

作者： chunLi Ming-YaoWu xian-yingWu ying-RuiLiang DepartmentofPathology MedicalCollegeShantouUniversityShantou515031GuangdongProvinceChina DepartmentofPathology FoshanFirstPeople'sHospitalFoshan528000GuangdongProvinceChina

AIM: To investigate telomerase activity and hTERT, TP-1 expression and their relationships in esophageal squamouscell carcinoma (ESCC).METHODS: Telomerase activity was measured in 60 ESCCtissues using telomeric repeat amplification protocol (TRAP)assay by silver staining. In situ hybridization was used for detecting hTERT and ***: The telomerase activity was detected in 83.3 % of ESCC tissues. The difference of telomerase activity was significant between well and poorly cancer differentiated lesions (P<0.05). The positive rate of telomerase activity was higher in patients with lymphatic metastasis than in patients without lymphatic metastasis. In cancer tissues hTERT mRNA expression was 75 % and TP-1 mRNA expression was 71.7 %. The expression of hTERT, TP-1 mRNA in well and poorly differentiated carcinoma was not significant. The expression of hTERT mRNA was correlated with telomerase activity, but TP-1 mRNA expression was not correlated with ***: Telomerase activity and hTERT, TP-1 mRNA expression are up-regulated in ESCC. Telomerase activity in ESCC is correlated with lymphatic metastasis and cancer differentiation. Telomerase activity may be used as a prognostic marker in ESCC. hTERT mRNA expression is correlated with telomerase activity. Enhanced hTERT mRNA expression may initially comprehend the telomerase activity level, but it is less sensitive than TRAP assay.

关键词：食道鳞状细胞癌端粒酶肿瘤生物学 hTERT TP-lmRNA 淋巴结转移

Environmental Mn(Ⅱ) enhances the activity of dissimilatory arsenate-respiring prokaryotes from arsenic-contaminated soils

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Journal of Environmental Sciences 2023年第3期125卷 582-592页

作者： Yan Wu Weiwei Wu Yifan Xu Yanxia Zuo xian-chun Zeng State Key Laboratory of Biogeology and Environmental Geology&School of Environmental Studies China University of Geosciences(Wuhan)Wuhan 430074China Institute of Hydrobiology the Chinese Academy of SciencesWuhan 430072China

Many investigations suggest that dissimilatory arsenate-respiring prokaryotes (DARPs) play a key role in stimulating reductive mobilization of As from solid phase into groundwater,but it is not clear how environmental Mn(Ⅱ) affects the DARPs-mediated reductive mobilization of *** resolve this issue,we collected soil samples from a realgar tailingsaffected *** found that there were diverse arsenate-respiratory reductase (arr) genes in the *** microbial communities had high arsenate-respiring activity,and were able to efficiently stimulate the reductive mobilization of *** to the microcosms without Mn(Ⅱ),addition of 10 mmol/L Mn(Ⅱ) to the microcosms led to 23.99%-251.79% increases in the microbial mobilization of As,and led to 133.3%-239.2% increases in the abundances of arr *** further isolated a new cultivable DARP,Bacillus sp.F11,from the arseniccontaminated *** completely reduced 1 mmol/L As(V) in 5 days under the optimal reaction *** further found that it was able to efficiently catalyze the reductive mobilization and release of As from the solid phase;the addition of 2 mmol/L Mn(Ⅱ) led to 98.49%-248.78% increases in the F11 cells-mediated reductive mobilization of As,and70.6%-104.4% increases in the arr gene *** data suggest that environmental Mn(Ⅱ) markedly increased the DARPs-mediated reductive mobilization of As in arseniccontaminated *** work provided a new insight into the close association between the biogeochemical cycles of arsenic and manganese.

关键词： dissimilatory arsenate-respiring prokaryote Arsenic mobilization Arsenic-contaminated groundwater Arsenate reduction Mn(II)

Interplay between entanglement and crosslinking in determining mechanical behaviors of polymer networks

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International Journal of Smart and Nano Materials 2023年第4期14卷 474-495页

作者： Yuhao Liu Weikang xian Jinlong He ying Li Department of Mechanical Engineering University of Wisconsin-MadisonMadisonWIUSA

In polymer physics,the concept of entanglement refers to the topological constraints between long polymer chains that are closely packed *** theory and experimentation suggest that entanglement has a significant influence on the mechanical properties of *** indicates its promise for materials design across various ***,understanding the relationship between entanglement and mechanical properties is complex,especially due to challenges related to length scale constraints and the diffculties of direct experimental *** research delves into how the polymer network structure changes when *** specifically examine the relationship between entanglement,crosslinked networks,and their roles in stretching both entangled and unentangled polymer *** unentangled polymers,our findings underscore the pivotal role of crosslinking bond strength in determining the system's overall strength and resistance to *** for entangled polymers,entanglement plays a pivotal role in load bearing during the initial stretching stage,preserving the integrity of the polymer *** the stretching continues and entanglement diminishes,the responsibility for bearing the load increasingly shifts to the crosslinking network,signifying a critical change in the system's *** noted a linear correlation between the increase in entanglement and the rise in tensile stress during the initial stretching ***,the destruction of the network correlates with a decrease in tensile stress in the later *** findings provide vital insights into the complex dynamics between entanglement and crosslinking in the stretching processes of polymer networks,offering valuable guidance for future manipulation and design of polymer materials to achieve desired'mechanical properties.

关键词： Entanglement crosslinking networks mechanical property microstructure evolution molecular dynamics simulation