23 results on '"SUWEN CHEN"'
Search Results
2. Preparation of porous amidoximated nanofibers with antibacterial properties, and experiments on uranium extraction from seawater
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Ziyao Du, Chang Qu, Xiangjian Meng, Ziyang Wang, Huilian Mo, Chao Jiang, Ruopei Sun, Jing Wang, Tianle Gong, and Suwen Chen
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Nuclear Energy and Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Radiology, Nuclear Medicine and imaging ,Pollution ,Spectroscopy ,Analytical Chemistry - Published
- 2023
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3. Preparation and performance of amidoximated silver-silica core–shell nanoparticles for uranium extraction from seawater
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Huilian Mo, Ruopei Sun, Chang Qu, Chao Jiang, Ziyao Du, Jing Wang, Ziyang Wang, Xiangjian Meng, and Suwen Chen
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Nuclear Energy and Engineering ,Health, Toxicology and Mutagenesis ,Public Health, Environmental and Occupational Health ,Radiology, Nuclear Medicine and imaging ,Pollution ,Spectroscopy ,Analytical Chemistry - Published
- 2022
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4. Improved Tribological Properties of Poly(methyl methacrylate) Based Composites by the Synergistic Effect of Incorporating Ultra-High Molecular Weight Polyethylene and Heat Treatment
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Dapeng Gu, Shuaibing Wang, Jingchao Zhang, Ke Liu, Suwen Chen, Xiaofan Chen, Zibo Wang, and Jintu Liu
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Mechanics of Materials ,Mechanical Engineering ,General Materials Science - Published
- 2022
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5. Inactivation of EGLN3 hydroxylase facilitates Erk3 degradation via autophagy and impedes lung cancer growth
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Ying Jin, Yamu Pan, Shuang Zheng, Yao Liu, Jie Xu, Yazhi Peng, Zemei Zhang, Yadong Wang, Yulian Xiong, Lei Xu, Kaiyu Mu, Suwen Chen, Fei Zheng, Ye Yuan, and Jian Fu
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Mice ,Cancer Research ,Lung Neoplasms ,Autophagy ,Tumor Microenvironment ,Genetics ,Animals ,Humans ,Lysosomes ,Molecular Biology ,Hypoxia-Inducible Factor-Proline Dioxygenases ,Mitogen-Activated Protein Kinase 6 ,Mixed Function Oxygenases - Abstract
EGLN3 is critically important for growth of various cancers including lung cancer. However, virtually nothing is known about the role and mechanism for EGLN3 hydroxylase activity in cancers. EGLN3 catalyzes the hydroxylation of extracellular signal-regulated kinase 3 (Erk3), a potent driver of cancers. The role and mechanism for EGLN3-induced stabilization of Erk3 remain to be defined. Here, we show that Erk3 interacts with heat shock cognate protein of 70 kDa (HSC70) and lysosome-associated membrane protein type 2 A (LAMP2A), two core components of chaperone-mediated autophagy (CMA). As a consequence, Erk3 is degraded by the CMA-lysosome pathway. EGLN3-catalyzed hydroxylation antagonizes CMA-dependent destruction of Erk3. Mechanistically, hydroxylation blunts the interaction of Erk3 with LAMP2A, thereby blocking lysosomal decay of Erk3. EGLN3 inactivation inhibits macrophage migration, efferocytosis, and M2 polarization. Studies using EGLN3 catalytically inactive knock-in mice indicate that inactivation of EGLN3 hydroxylase in host cells ameliorates LLC cancer growth through reprogramming the tumor microenvironment (TME). Adoptive transfer of macrophages with inactivated EGLN3 restrains tumor growth by mounting anti-tumor immunity and restricting angiogenesis. Administration of EGLN3 hydroxylase pharmacologic inhibitor to mice bearing LLC carcinoma impedes cancer growth by targeting the TME. LLC cells harboring inactivated EGLN3 exhibit reduced tumor burden via mitigating immunosuppressive milieu and inducing cancer senescence. This study provides novel insights into the role of CMA in regulating Erk3 stability and the mechanism behind EGLN3-enhanced stability of Erk3. This work demonstrates that inactivation of EGLN3 in malignant and stromal cells suppresses tumor by orchestrating reciprocal interplays between cancer cells and the TME. This work sheds new light on the role and mechanism for EGLN3 catalytic activity in regulating cancer growth. Manipulating EGLN3 activity holds promise for cancer treatment.
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- 2022
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6. Preparation and performance of silver-incorporated antibacterial amidoximated electrospun nanofiber for uranium extraction from seawater
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Chang Qu, Chao Jiang, Jing Wang, Huilian Mo, Suwen Chen, Ziyao Du, and Ruopei Sun
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Materials science ,Health, Toxicology and Mutagenesis ,Extraction (chemistry) ,Public Health, Environmental and Occupational Health ,chemistry.chemical_element ,Uranium ,Pollution ,Analytical Chemistry ,Nuclear Energy and Engineering ,chemistry ,Electrospun nanofibers ,Radiology, Nuclear Medicine and imaging ,Seawater ,Spectroscopy ,Nuclear chemistry - Published
- 2021
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7. Sorption of U(VI) on Schiff-base functionalized metal–organic frameworks UiO-66-NH2
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Bolin Li, Ziyao Du, Ruopei Sun, Suwen Chen, and Chao Jiang
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Schiff base ,Oscillation ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Sorption ,010403 inorganic & nuclear chemistry ,01 natural sciences ,Pollution ,0104 chemical sciences ,Analytical Chemistry ,chemistry.chemical_compound ,Adsorption ,Nuclear Energy and Engineering ,chemistry ,Salicylaldehyde ,Ionic strength ,Kinetic equations ,Radiology, Nuclear Medicine and imaging ,Metal-organic framework ,Spectroscopy - Abstract
A metal–organic framework, UiO-66-NH2, was designed, synthesized and characterized in this study. By conducting solvothermal method, Salicylaldehyde (Sal) and 2,4-dihydroxybenzaldehyde (MHBA) were grafted onto UiO-66-NH2 via post-treatment to obtain the functionalized material UiO-66-Sal and UiO-66-MHBA. The three materials above were characterized, and the effects of solid–liquid ratio, pH, ionic strength, and oscillation time on U(VI) adsorption were studied. The relevant experimental results fitted well with pseudo-second-order kinetic equation and thermodynamic adsorption model.
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- 2021
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8. A Highly Efficient BODIPY Based Turn-off Fluorescent Probe for Detecting Cu2+
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Wangsuo Wu, Ruopei Sun, Suwen Chen, Lusheng Wang, Chao Jiang, and Ziyao Du
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Detection limit ,Sociology and Political Science ,010405 organic chemistry ,Chemistry ,Metal ions in aqueous solution ,Clinical Biochemistry ,chemistry.chemical_element ,010402 general chemistry ,Photochemistry ,01 natural sciences ,Biochemistry ,Copper ,Fluorescence ,0104 chemical sciences ,Ion ,Clinical Psychology ,chemistry.chemical_compound ,Emission spectrum ,BODIPY ,Absorption (chemistry) ,Law ,Spectroscopy ,Social Sciences (miscellaneous) - Abstract
Based on boron-dipyrromethene (BODIPY), taking 2-hydroxy-N-(2-hydroxyphenyl)benzamide as recognition site, a new fluorescent probe HHPBA-BODIPY aimed at sensitively detecting Cu ions was designed, synthesized and characterized.The emission spectra of HHPBA-BODIPY exhibited an intensive green fluorescence around 510 nm, with a maximum absorption near 500 nm. When Cu2+ ions are present, the fluorescence at 510 nm can be quenched with a good linearity between the copper ion concentrationand the fluorescence intensity and the detection limit is 0.35 μM. HHPBA-BODIPY is also selective toward Cu2+, while other metal ions show no interfere except Fe3+ and Cr3+ ions. In addition, HHPBA-BODIPY also proved efficient to detect Cu2+ in water samples which offers the possibility to detect trace amount of Cu2+ for environmental monitoring. Copper ions; BODIPY; fluorescent probe.
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- 2020
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9. Effects of light quality and photoperiod on growth and photosynthetic pigment content of a Rhodophyta, Gloiopeltis furcata
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Changbo Zhu, Zhang Wenwen, and Suwen Chen
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0106 biological sciences ,photoperiodism ,biology ,010604 marine biology & hydrobiology ,Phycobiliprotein ,04 agricultural and veterinary sciences ,Photosynthetic pigment ,Aquatic Science ,biology.organism_classification ,01 natural sciences ,Thallus ,chemistry.chemical_compound ,Gloiopeltis furcata ,Pigment ,Horticulture ,chemistry ,Algae ,visual_art ,040102 fisheries ,visual_art.visual_art_medium ,0401 agriculture, forestry, and fisheries ,Growth rate - Abstract
The objective of the present study was to determine the optimal incubation conditions for Gloiopeltis furcata culture. Three experiments, each lasting 30 days, were conducted to study the effects of photoperiod (6:18, 8:16, 12:12, 14:10, and 16:8 h light/dark), different wavelengths of LED light (blue, green, yellow, red, and white), and solar radiation filtered through different plastic films (blue, green, yellow, red, and white) on the growth and photosynthetic pigment content of G. furcata. The results of these experiments demonstrated that the growth rate of G. furcata was significantly higher under 14:10 and 16:8 light/dark than under 6:18 and 8:16 light/dark, while the pigment content of G. furcata was significant higher under 6:18 and 8:16 than under 14:10 and 16:8 light/dark. The growth rate of G. furcata was the lowest when the algae were exposed to blue LED and the highest under yellow LED illumination, while the phycobiliprotein content was the highest under blue LED and the lowest under yellow LED. Solar radiation filtered through different plastic films had no significant effect on the growth rate of G. furcata, but affected its pigment content. The results indicate that a photoperiod of 12 h or more of light and yellow LED are the optimal parameters for culturing of G. furcata thalli on land.
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- 2020
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10. Correction to: Clinical analysis of second-trimester pregnancy termination after previous caesarean delivery in 51 patients with placenta previa and placenta accreta spectrum: a retrospective study
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Qiaofei Hu, Changdong Li, Lanrong Luo, Jian Li, Xiaofeng Zhang, Suwen Chen, and Xiaokui Yang
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Adult ,China ,Cesarean Section ,Abortifacient Agents, Steroidal ,Placenta Previa ,Correction ,Obstetrics and Gynecology ,Abortion, Induced ,Gynecology and obstetrics ,Placenta Accreta ,Vaginal Birth after Cesarean ,Mifepristone ,Young Adult ,Pregnancy ,Pregnancy Trimester, Second ,RG1-991 ,Humans ,Female ,Labor, Induced ,Hysterotomy ,Misoprostol ,Retrospective Studies - Abstract
Pregnancy termination during the second trimester in patients with placenta previa and placenta accreta spectrum (PAS) is a complex and challenging clinical problem. Based on our literature review, there has been a relative increase in the number of such cases being treated by hysterotomy and/or local uterine lesion resection and repair. In the present study, a retrospective analysis was conducted to compare the clinical outcomes when different management strategies were used to terminate pregnancy in the patients with placenta previa and PAS.A total of 51 patients who underwent pregnancy termination in the second trimester in Beijing Obstetrics and Gynecology Hospital between June 2013 and December 2018 were retrospectively analyzed in this study. All patients having previous caesarean delivery (CD) were diagnosed with placenta previa status and PAS.① Among the 51 patients, 16 cases received mifepristone and misoprostol medical termination, 15 cases received mifepristone and Rivanol medical termination, but 1 of them was transferred to hysterotomy due to failed labor induction, another 20 cases were performed planned hysterotomy. There was no placenta percreta cases and uterine artery embolization (UAE) was all performed before surgery.② There were 31 cases who underwent medical termination and 30 cases were vaginal delivery. Dilation and evacuation (DE) were used in 20 cases of medical abortion failure and in all 30 cases of difficult manual removal of placental tissue. ③ A statistically significant difference was found among the three different strategies in terms of gestational weeks, the type of placenta previa status, main operative success rate and β-HCG regression time (P 0.05). ④ There were 4(7.8%) cases who were taken up for hysterectomy because of life-threatening bleeding or severe bacteremia during or after delivery and hysterotomy. The uterus was preserved with the implanted placenta partly or completely left in situ in 47(92.2%) cases. Combined medical and/or surgical management were used for the residual placenta and the time of menstrual recovery was 52(range: 33 to 86) days after pregnancy termination.Terminating a pregnancy by vaginal delivery through medical induction of labor may be feasible if clinicians have an overall understanding of gestational age, the type of placenta previa status, the type of placenta accreta, and patients concerns about preserving fertility. A collaborative team effort in tertiary medical centers with a very experience MDT and combined application of multiple methods is required to optimize patient outcomes.
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- 2021
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11. Glass and Extreme Events
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Suwen Chen, Stefan Kolling, and Johannes Kuntsche
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Architecture ,Building and Construction ,Civil and Structural Engineering - Published
- 2022
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12. Clinical analysis of second-trimester pregnancy termination after previous caesarean delivery in 51 patients with placenta previa and placenta accreta spectrum: a retrospective study
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Lanrong Luo, Suwen Chen, Changdong Li, Jian Li, Qiao-Fei Hu, Xiaofeng Zhang, and Xiaokui Yang
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medicine.medical_specialty ,Pregnancy ,Obstetrics ,Vaginal delivery ,Placenta accreta ,business.industry ,Research ,medicine.medical_treatment ,Placenta Percreta ,Obstetrics and Gynecology ,Second-trimester pregnancy termination ,Placenta previa ,Gynecology and obstetrics ,medicine.disease ,RG1-991 ,medicine ,Hysterotomy ,Dilation and evacuation ,business ,Management strategy ,Misoprostol ,medicine.drug - Abstract
Backgrounds Pregnancy termination during the second trimester in patients with placenta previa and placenta accreta spectrum (PAS) is a complex and challenging clinical problem. Based on our literature review, there has been a relative increase in the number of such cases being treated by hysterotomy and/or local uterine lesion resection and repair. In the present study, a retrospective analysis was conducted to compare the clinical outcomes when different management strategies were used to terminate pregnancy in the patients with placenta previa and PAS. Methods A total of 51 patients who underwent pregnancy termination in the second trimester in Beijing Obstetrics and Gynecology Hospital between June 2013 and December 2018 were retrospectively analyzed in this study. All patients having previous caesarean delivery (CD) were diagnosed with placenta previa status and PAS. Results ① Among the 51 patients, 16 cases received mifepristone and misoprostol medical termination, 15 cases received mifepristone and Rivanol medical termination, but 1 of them was transferred to hysterotomy due to failed labor induction, another 20 cases were performed planned hysterotomy. There was no placenta percreta cases and uterine artery embolization (UAE) was all performed before surgery.② There were 31 cases who underwent medical termination and 30 cases were vaginal delivery. Dilation and evacuation (D&E) were used in 20 cases of medical abortion failure and in all 30 cases of difficult manual removal of placental tissue. ③ A statistically significant difference was found among the three different strategies in terms of gestational weeks, the type of placenta previa status, main operative success rate and β-HCG regression time (P Conclusions Terminating a pregnancy by vaginal delivery through medical induction of labor may be feasible if clinicians have an overall understanding of gestational age, the type of placenta previa status, the type of placenta accreta, and patients concerns about preserving fertility. A collaborative team effort in tertiary medical centers with a very experience MDT and combined application of multiple methods is required to optimize patient outcomes.
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- 2021
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13. Circular RNA circIKBKB promotes breast cancer bone metastasis through sustaining NF-κB/bone remodeling factors signaling
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Libing Song, Suwen Chen, Ziwen Li, Jun Li, Xincheng Li, Ruyuan Yu, Man Li, Meisongzhu Yang, Yingru Xu, Mudan Huang, Xingui Wu, Miaoling Tang, Shuxia Zhang, Xinyi Liao, and Yameng Hu
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0301 basic medicine ,Cancer Research ,Bone Neoplasms ,Breast Neoplasms ,Osteolysis ,In situ hybridization ,Biology ,Models, Biological ,NF-κB ,Bone resorption ,Bone remodeling ,DEAD-box RNA Helicases ,Mice ,03 medical and health sciences ,Breast cancer ,0302 clinical medicine ,NF-KappaB Inhibitor alpha ,Osteogenesis ,Circular RNA ,Cell Line, Tumor ,Bone remodeling factor ,medicine ,Animals ,Humans ,RC254-282 ,Research ,NF-kappa B ,Neoplasms. Tumors. Oncology. Including cancer and carcinogens ,Cancer ,Bone metastasis ,RNA, Circular ,medicine.disease ,Xenograft Model Antitumor Assays ,I-kappa B Kinase ,Gene Expression Regulation, Neoplastic ,Disease Models, Animal ,IκBα ,030104 developmental biology ,Oncology ,circIKBKB ,030220 oncology & carcinogenesis ,Eukaryotic Initiation Factor-4A ,Cancer research ,Molecular Medicine ,Female ,Bone Remodeling ,RNA extraction ,Signal Transduction - Abstract
Background Breast cancer (BC) has a marked tendency to spread to the bone, resulting in significant skeletal complications and mortality. Recently, circular RNAs (circRNAs) have been reported to contribute to cancer initiation and progression. However, the function and mechanism of circRNAs in BC bone metastasis (BC-BM) remain largely unknown. Methods Bone-metastatic circRNAs were screened using circRNAs deep sequencing and validated using in situ hybridization in BC tissues with or without bone metastasis. The role of circIKBKB in inducing bone pre-metastatic niche formation and bone metastasis was determined using osteoclastogenesis, immunofluorescence and bone resorption pit assays. The mechanism underlying circIKBKB-mediated activation of NF-κB/bone remodeling factors signaling and EIF4A3-induced circIKBKB were investigated using RNA pull-down, luciferase reporter, chromatin isolation by RNA purification and enzyme-linked immunosorbent assays. Results We identified that a novel circRNA, circIKBKB, was upregulated significantly in bone-metastatic BC tissues. Overexpressing circIKBKB enhanced the capability of BC cells to induce formation of bone pre-metastatic niche dramatically by promoting osteoclastogenesis in vivo and in vitro. Mechanically, circIKBKB activated NF-κB pathway via promoting IKKβ-mediated IκBα phosphorylation, inhibiting IκBα feedback loop and facilitating NF-κB to the promoters of multiple bone remodeling factors. Moreover, EIF4A3, acted acting as a pre-mRNA splicing factor, promoted cyclization of circIKBKB by directly binding to the circIKBKB flanking region. Importantly, treatment with inhibitor eIF4A3-IN-2 reduced circIKBKB expression and inhibited breast cancer bone metastasis effectively. Conclusion We revealed a plausible mechanism for circIKBKB-mediated NF-κB hyperactivation in bone-metastatic BC, which might represent a potential strategy to treat breast cancer bone metastasis.
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- 2021
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14. Investigation of U(VI), Th(IV), and Eu(III) ions’ sorption behavior onto silica gel modified with anhydride
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Lijuan Qian, Yi Zhong, Suwen Chen, Wenya Tai, Qiang Shan, Tonghuan Liu, Zhiwei Lei, Yu Nan, and Peizhuo Hu
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Aqueous solution ,Sorbent ,Chemistry ,Silica gel ,Health, Toxicology and Mutagenesis ,Enthalpy ,Potentiometric titration ,Public Health, Environmental and Occupational Health ,Langmuir adsorption model ,Sorption ,010403 inorganic & nuclear chemistry ,01 natural sciences ,Pollution ,0104 chemical sciences ,Analytical Chemistry ,chemistry.chemical_compound ,symbols.namesake ,Adsorption ,Nuclear Energy and Engineering ,symbols ,Radiology, Nuclear Medicine and imaging ,Spectroscopy ,Nuclear chemistry - Abstract
Modification of silica gel by butanedioic anhydride (SiO2–BDAH) results in efficient adsorbents for removal of U(VI), Th(IV), and Eu(III) from aqueous solutions. SiO2–BDAH was characterized by Fourier Transform infrared spectroscopy, elemental analysis, N2 adsorption–desorption isotherms, thermogravimetic analysis, and potentiometric titration. The effect of contact time, pH, and initial concentration of radioactive solutions and temperature on the adsorption capacity of the sorbent was investigated. The sorption equilibrium times of U(VI), Th(IV), and Eu(III) onto SiO2–BDAH were 1.5, 2, and about 10 h. The sorption percentages of U(VI), Th(IV), and Eu(III) increased with increased pH from 1 to 5. The sorption process of U(VI), Th(IV), and Eu(III) can be described by the Langmuir model, with sorption capacities of 5.10 × 10−5, 5.06 × 10−5, and 3.44 × 10−5 mol/L, respectively. The enthalpy and entropy changes were all positive, whereas the free energy changes were negative. This study indicated that SiO2–BDAH can remove U(VI) and Th(IV) at the same time in the presence of multiple ions from waste water quickly.
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- 2019
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15. Optimal design and dynamic impact tests of removable bollards
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Liu Tianyi, Liu Qing, Suwen Chen, Guo-Qiang Li, and Jianyun Sun
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Optimal design ,Flexibility (engineering) ,Computer simulation ,Explosive material ,Computer science ,business.industry ,Mechanical Engineering ,02 engineering and technology ,Building and Construction ,Structural engineering ,021001 nanoscience & nanotechnology ,Geotechnical Engineering and Engineering Geology ,Residual ,Collision ,Finite element method ,020303 mechanical engineering & transports ,0203 mechanical engineering ,0210 nano-technology ,business ,Rotation (mathematics) ,Civil and Structural Engineering - Abstract
Anti-ram bollard systems, which are installed around buildings and infrastructure, can prevent unauthorized vehicles from entering, maintain distance from vehicle-borne improvised explosive devices (VBIED) and reduce the corresponding damage. Compared with a fixed bollard system, a removable bollard system provides more flexibility as it can be removed when needed. This paper first proposes a new type of K4-rated removable anti-ram bollard system. To simulate the collision of a vehicle hitting the bollard system, a finite element model was then built and verified through comparison of numerical simulation results and existing experimental results. Based on the orthogonal design method, the factors influencing the safety and economy of this proposed system were examined and sorted according to their importance. An optimal design scheme was then produced. Finally, to validate the effectiveness of the proposed design scheme, four dynamic impact tests, including two front impact tests and two side impact tests, have been conducted according to BSI Specifications. The residual rotation angles of the specimen are smaller than 30o and satisfy the requirements of the BSI Specification.
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- 2017
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16. Orthogonal analysis and optimization of a K4-rating auto-lifting anti-ram bollard system
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Yu Zhang, Suwen Chen, Hu Bo, Guo-Qiang Li, and Cao Ke
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Optimal design ,Engineering ,Computer simulation ,Explosive material ,business.industry ,02 engineering and technology ,Structural engineering ,010501 environmental sciences ,01 natural sciences ,Stiffening ,020303 mechanical engineering & transports ,0203 mechanical engineering ,Solid mechanics ,Substructure ,Boundary value problem ,Orthogonal array ,business ,0105 earth and related environmental sciences ,Civil and Structural Engineering - Abstract
The anti-ram bollard system (ABS) is installed around the perimeter of buildings and infrastructures to prevent the penetration of unauthorized vehicles and reduce the blast and debris caused by the vehicle-borne improvised explosive devices (VBIED). Comparing with the fixed anti-ram bollard system (FABS), the auto-lifting anti-ram bollard system (AABS) has the advantage to be set down automatically to allow authorized vehicles passing on. In this paper, a configuration of K4-rating AABS is proposed and a finite-element model is developed to simulate its performance. Differences between vehicle model and real vehicle, effects of boundary conditions are both taken into account. The effectiveness and accuracy of the numerical simulation are validated through predicting the results of relevant experiments. Based on the verified numerical model, 32 groups of numerical experiments of K4-rating AABS are investigated using an orthogonal array L32 (48×81). The order and significant levels of nine affecting factors are identified on the basis of the range analysis and variance analysis, respectively. It shows that gaps between substructure and outer sleeve, wall thickness of substructure, wall thickness of steel tube, diameter of steel tube and thickness of stiffening ribs have significant influences on the behavior of AABS. The optimal design is proposed according to the orthogonal analysis.
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- 2016
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17. Slab analysis of large cylindrical shell rolling considering mixed friction
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Suwen Chen, Yan Peng, Jian-liang Sun, and Hong-Min Liu
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Physics::Fluid Dynamics ,Materials science ,Shear (geology) ,Mechanics of Materials ,business.industry ,Mechanical Engineering ,Rolling resistance ,Coulomb ,Slab ,Torque ,Structural engineering ,Physics::Classical Physics ,business - Abstract
Large cylindrical shell rolling is an advanced plastic-forming technique that has unequal speed and radius of both its upper and lower rolls. A theoretical model for a large cylindrical shell rolling that is based on the slab method is proposed, in which the non-uniform normal and shear stresses that act on the vertical sides are considered. A mixed friction model of combined Coulomb and sticking friction is used to present interface friction, to improve the accuracy of the proposed model. The rolling pressure, rolling force, and torque as well as friction stress can be rapidly and easily calculated through the proposed model at different rolling conditions. The predicted rolling force is consistent with the experimental result. The research results provide valuable guidelines for both the design and optimization of rolling product, process, and equipment.
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- 2014
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18. A facile way to fabricate a superamphiphobic surface
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Xiaoyan Zhou, Bo Ge, Wang-Suo Wu, Suwen Chen, Xiaotao Zhu, and Yuan Li
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Surface (mathematics) ,chemistry.chemical_compound ,chemistry ,Coating ,Dodecane ,engineering ,General Materials Science ,Nanotechnology ,General Chemistry ,Organic liquids ,Wetting ,engineering.material ,Hybrid material - Abstract
Compared to superhydrophobic surfaces, superamphiphobic surfaces possess more potential applications but are difficult to fabricate. Herein, to address this problem, we describe a simple method to fabricate a superamphiphobic surface based on a CNTs–SiO2 hybrid material. The CNTs–SiO2 hybrid material obtained by a sol–gel approach was sprayed onto glass slides to form coatings. After surface fluorination, the sprayed coating displayed superamphiphobicity toward water and a number of organic liquids, such as dodecane. It was found that the time of fluorination slightly influenced the surface wettability of the sprayed coating. We also investigated the role of CNTs and SiO2 on superamphiphobicity establishment separately, and such information allowed us to engineer surfaces with specific wettability.
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- 2014
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19. Surface modification to improve the sorption property of U(VI) on mesoporous silica
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Lu Zhu, Suwen Chen, Yu-Long Wang, Lijuan Song, Wangsuo Wu, and Bo-Long Guo
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Langmuir ,Materials science ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Sorption ,Mesoporous silica ,Pollution ,Analytical Chemistry ,Mesoporous organosilica ,Adsorption ,Nuclear Energy and Engineering ,Ionic strength ,Radiology, Nuclear Medicine and imaging ,Freundlich equation ,Mesoporous material ,Spectroscopy ,Nuclear chemistry - Abstract
Polyoxometalates K7[α-PW11O39]·14H2O (PW11) modified mesoporous silica (MCM-48) with cubic structure, was prepared by impregnation and calcination methods. The modified mesoporous silica sorbent (PW11/MCM-48) was studied as a potential adsorbent for U(VI) from aqueous solutions. MCM-48 and PW11/MCM-48 were confirmed by X-ray diffraction and nitrogen physisorption techniques. The results indicate the original keggin structure of PW11 and mesoporous structure of MCM-48 are maintained after supporting PW11 on mesoporous silica MCM-48. The effects of contact time, solid-to-liquid ratio (m/V), solution pH and ionic strength on U(VI) sorption behaviors of the pure and modified mesoporous silicas were also studied. Typical sorption isotherms such as Langmuir and Freundlich isotherms were determined for sorption process. The results suggest that the sorption of U(VI) on MCM-48 or PW11/MCM-48 are strongly dependent on pH values but independent of ionic strength. The sorption capacity of PW11/MCM-48 for U(VI) is about ten times more than that of MCM-48.
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- 2014
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20. Study on sorption of U(VI) onto ordered mesoporous silicas
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Bo-Long Guo, Lijuan Song, Yuan Li, Suwen Chen, and Yu-Long Wang
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Langmuir ,Aqueous solution ,Chemistry ,Exothermic process ,Health, Toxicology and Mutagenesis ,Inorganic chemistry ,Public Health, Environmental and Occupational Health ,Analytical chemistry ,Langmuir adsorption model ,Sorption ,Pollution ,Analytical Chemistry ,symbols.namesake ,Nuclear Energy and Engineering ,Ionic strength ,symbols ,Radiology, Nuclear Medicine and imaging ,Freundlich equation ,Mesoporous material ,Spectroscopy - Abstract
The mesoporous silicas (MCM-41 and MCM-48) are synthesized by hydrothermal method, which are characterized by XRD and BET techniques. The application of mesoporous silicas for the sorption of U(VI) from aqueous solution are studied by using batch technique under ambient condition. The effects of contact time, solid-to-liquid ratio (m/V), solution pH, ionic strength and temperature are determined, and the results indicate that the sorption of U(VI) to MCM-41 or MCM-48 are strongly dependent on pH values but independent of ionic strength. Compared with Langmuir model, the sorption isotherms can be simulated by Freundlich model well according to the high relative coefficients. The parameters for Langmuir and Freundlich sorption isotherms are calculated from the temperature at 298, 318 and 338 K, respectively, and the results suggest that the sorption of U(VI) on MCM-41 or MCM-48 is a spontaneous and exothermic process. In contrast to its sorption capacity for U(VI), MCM-48 is a suitable material for the preconcentration of U(VI) from large volumes of aqueous solutions.
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- 2012
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21. A novel fabrication of superhydrophobic surfaces for universal applicability
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Bo-Long Guo, Wang-Suo Wu, and Suwen Chen
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Fabrication ,Scanning electron microscope ,Composite number ,chemistry.chemical_element ,Nanotechnology ,General Chemistry ,Copper ,Furfuryl alcohol ,Contact angle ,chemistry.chemical_compound ,chemistry ,Stearate ,General Materials Science ,Powder diffraction - Abstract
The present work reports a novel and facile approach to fabricate stable superhydrophobic surfaces for universal applicability in practice. Poly(furfuryl alcohol)/copper composite coatings were prepared on substrates via a brush-painting method; after being immersed in a stearic acid solution, the superhydrophobic surfaces were obtained due to the formation of copper stearate on the substrates. These products were characterized by field-emission scanning electron microscopy, Fourier transform infrared spectrometry, X-ray powder diffraction and the X-ray photoelectron spectrum. Results demonstrate that the superhydrophobic surfaces formed originally on copper substrates can also be generated on other substrates without the copper element. Furthermore, this work will provide a simple and universal method to create large-scale superhydrophobic surfaces on various substrates.
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- 2011
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22. Effects of light and temperature on the attachment and development of Gloiopeltis tenax and Gloiopeltis furcata tetraspores
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Changbo Zhu, Chen Lixiong, Jinfeng Wu, and Suwen Chen
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photoperiodism ,Gloiopeltis furcata ,Germination ,Botany ,Tenax ,Maximum density ,Plant Science ,Aquatic Science ,Biology ,Thallus ,Spore ,Sprouting - Abstract
Two 60-day experiments were conducted to study the influence of photon flux density (PFD) and temperature on the attachment and development of Gloiopeltis tenax and Gloiopeltis furcata tetraspores. In the first experiment, tetraspores of the two Gloiopeltis species were incubated at five temperature ranges (8°C, 12°C, 16°C, 20°C, 24°C) under a constant PFD of 80 μmol photons m−2 s−1 with a photoperiod of 12:12. In a second experiment, tetraspores were incubated under five PFD gradients (30, 55, 80, 105, 130 μmol photons m−2 s−1) at a constant temperature of 16°C with a photoperiod of 12:12. Maximum density of attached tetraspores was observed at 16°C for both species. Maximum per cent of spore germinating into disc was recorded at 12–16°C for G. tenax and 8–12°C for G. furcata. Maximum per cent of discs producing erect axes for G. tenax and G. furcata were recorded at 24°C and 20°C, respectively. Light had no significant effect on tetraspore attachment and developing into disc, but it affected the growth, sprouting and survival of its discs. Under 30–55 μmol photons m−2 s−1, the discs of the two species of Gloiopeltis did not form thallus until the end of the experiment. Optimum PFD range for G. tenax discs was 80–105 μmol photons m−2 s−1, whilst it was 80–130 μmol photons m−2 s−1 for G. furcata. Results presented in this study are expected to assist the progress of artificial seeding of Gloiopeltis.
- Published
- 2011
- Full Text
- View/download PDF
23. Introduction to enhanced protective film systems
- Author
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Guo-Qiang Li, David Palermo, Chunlin Liu, Jianyun Sun, and Suwen Chen
- Subjects
Engineering ,Multidisciplinary ,business.industry ,Mechanical engineering ,Structural engineering ,Explosive blast ,Engineering principles ,business ,Sheet steel - Abstract
An explosive blast mitigation alternative has increased the safety of structures by using “catcher” systems. These systems “catch” or repel the failure of the window or in-fill wall protecting life and property from ballistic shards or fragments. They can be designed to be standalone in new construction and structural retrofits or used to augment structural hardening techniques. Cables, fabrics, and thin gauge sheet steel are examples of catcher systems used in the past. A new and evolving category of catcher systems are based on polymeric materials that can be used for both wall and window upgrades. These products are a proven blast mitigation concept and K&C Protective Technologies Pte Ltd (KCPT) together with Sherwin-Williams(SW) use KCPT’s blast engineering capacity and SW’s material engineering principles to create engineered systems for even greater in-use performance.
- Published
- 2008
- Full Text
- View/download PDF
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