自新冠肺炎疫情以来,全球对一次性医用口罩(disposable medical masks,DMMs)等医疗物资的需求不断攀升,根据流行性传染病专家预判,在未来很长一段时间内,通过佩戴口罩阻隔细菌和病毒等将成为生活常态.如何处理大量废弃DMMs,是全球各个...自新冠肺炎疫情以来,全球对一次性医用口罩(disposable medical masks,DMMs)等医疗物资的需求不断攀升,根据流行性传染病专家预判,在未来很长一段时间内,通过佩戴口罩阻隔细菌和病毒等将成为生活常态.如何处理大量废弃DMMs,是全球各个国家和地区面临的重要课题.本综述从化学升级再造(chemical upcycling)的角度出发,综述和展望了废弃DMMs的主体材料(聚丙烯,PP)回收的现状和未来升级再造的途径,包括机械共混、化学改性、可控降解、物理加工改性等,并分析了各种途径的优劣势,指出将废弃PP通过化学方法有选择性地转换为产品种类单一的相关化学品、燃料和高附加值的相关材料,是实现将废弃DMMs变“废”为“宝”和可持续发展的根本方法.展开更多
OBJECTIVE： Traditional Chinese medicine （TCM） is regarded as an important treatment for gastric cancer patients, especially for those in advanced stage. To evaluate the effects of TCM treatment on gastric cancer pa...OBJECTIVE： Traditional Chinese medicine （TCM） is regarded as an important treatment for gastric cancer patients, especially for those in advanced stage. To evaluate the effects of TCM treatment on gastric cancer patients, the authors performed a retrospective study to report the result of the integrated treatment of TCM with chemotherapy for stage IV non-surgical gastric cancer. METHODS： In this study, 182 patients with stage IV and non-surgical gastric cancer were retrospectively analyzed to evaluate the effects of TCM integrated with chemotherapy. Among the 182 cases, 88 cases received integrated therapy consisting of TCM and chemotherapy, while 94 cases received chemotherapy alone. The overall survival and Karnofsky performance status （KPS） score were measured as the main outcome. RESULTS： The median overall survival of the integrated therapy group and chemotherapy group were 16.9 and 10.5 months, respectively. The 1-, 3- and 5-year survival rates of integrated therapy group vs. chemotherapy group were 70% vs. 32%, 18% vs. 4%, and 11% vs. 0%, respectively. There was a significant difference between the two groups （x2 = 42.244, P 〈 0.001 ）. After six-month treatment, KPS scores of the integrated therapy group and the chemotherapy group were 75.00 ± 14.78 and 60.64 ± 21.39, respectively （P 〈 0.001）. The Cox regression analysis showed that TCM treatment is a protective factor for patients＇ overall survival. CONCLUSION： This study demonstrated that TCM integrated with chemotherapy may prolong overal survival and improve survival rate and life quality of patients with stage IV non-surgical gastric cancer展开更多
The effect of copper addition to 2205 duplex stainless steel（DSS） on its resistance against pitting corrosion by the Pseudomonas aeruginosa biofilm was investigated using electrochemical and surface analysis techniq...The effect of copper addition to 2205 duplex stainless steel（DSS） on its resistance against pitting corrosion by the Pseudomonas aeruginosa biofilm was investigated using electrochemical and surface analysis techniques. Cu addition decreased the general corrosion resistance, resulting in a higher general corrosion rate in the sterile medium. Because DSS usually has a very small general corrosion rate, its pitting corrosion resistance is far more important. In this work, it was shown that 2205-3%Cu DSS exhibited a much higher pitting corrosion resistance against the P. aeruginosa biofilm compared with the 2205 DSS control, characterized by no significant change in the pitting potential and critical pitting temperature（CPT） values. The strong pitting resistance ability of 2205-3%Cu DSS could be attributed to the copper-rich phases on the surface and the release of copper ions, providing a strong antibacterial ability that inhibited the attachment and growth of the corrosive P. aeruginosa biofilm.展开更多
Black holes(BHs)exhibiting coordinate singularities but lacking essential singularities throughout the spacetime are referred to as regular black holes(RBHs).The initial formulation of RBHs was presented by Bardeen,wh...Black holes(BHs)exhibiting coordinate singularities but lacking essential singularities throughout the spacetime are referred to as regular black holes(RBHs).The initial formulation of RBHs was presented by Bardeen,who considered the Einstein equation coupled with a nonlinear electromagnetic field.In this study,we investigate the gravitational perturbations,including the axial and polar sectors,of the Bardeen(Anti-)de Sitter black holes.We derive the master equations with source terms for both axial and polar perturbations and subsequently compute the quasinormal modes(QNMs)through numerical methods.For the Bardeen de Sitter black hole,we employ the 6thorder WKB approach.The numerical results reveal that the isospectrality is broken in this case.Conversely,the QNM frequencies are calculated using the HH method for the Bardeen Anti-de Sitter black hole.展开更多
文摘自新冠肺炎疫情以来,全球对一次性医用口罩(disposable medical masks,DMMs)等医疗物资的需求不断攀升,根据流行性传染病专家预判,在未来很长一段时间内,通过佩戴口罩阻隔细菌和病毒等将成为生活常态.如何处理大量废弃DMMs,是全球各个国家和地区面临的重要课题.本综述从化学升级再造(chemical upcycling)的角度出发,综述和展望了废弃DMMs的主体材料(聚丙烯,PP)回收的现状和未来升级再造的途径,包括机械共混、化学改性、可控降解、物理加工改性等,并分析了各种途径的优劣势,指出将废弃PP通过化学方法有选择性地转换为产品种类单一的相关化学品、燃料和高附加值的相关材料,是实现将废弃DMMs变“废”为“宝”和可持续发展的根本方法.
基金supported by the Natural Science Foundation of Shanghai Science and Technology Commission (No. 17ZR1438800, for Dr. Xuan Liu)Traditional Chinese Medicine Guiding Project of Shanghai Science and Technology Commission (No . 13401907500 , for Zhi-feng Qin)+1 种基金Shanghai Municipal Commission of Health and Family Planning Program (No. ZY3-CCCX-3-3056, for Dr. Li-juan Xiu)National Natural Science Foundation Youth Program (No. 81603434, for Dr. Li-juan Xiu)
文摘OBJECTIVE： Traditional Chinese medicine （TCM） is regarded as an important treatment for gastric cancer patients, especially for those in advanced stage. To evaluate the effects of TCM treatment on gastric cancer patients, the authors performed a retrospective study to report the result of the integrated treatment of TCM with chemotherapy for stage IV non-surgical gastric cancer. METHODS： In this study, 182 patients with stage IV and non-surgical gastric cancer were retrospectively analyzed to evaluate the effects of TCM integrated with chemotherapy. Among the 182 cases, 88 cases received integrated therapy consisting of TCM and chemotherapy, while 94 cases received chemotherapy alone. The overall survival and Karnofsky performance status （KPS） score were measured as the main outcome. RESULTS： The median overall survival of the integrated therapy group and chemotherapy group were 16.9 and 10.5 months, respectively. The 1-, 3- and 5-year survival rates of integrated therapy group vs. chemotherapy group were 70% vs. 32%, 18% vs. 4%, and 11% vs. 0%, respectively. There was a significant difference between the two groups （x2 = 42.244, P 〈 0.001 ）. After six-month treatment, KPS scores of the integrated therapy group and the chemotherapy group were 75.00 ± 14.78 and 60.64 ± 21.39, respectively （P 〈 0.001）. The Cox regression analysis showed that TCM treatment is a protective factor for patients＇ overall survival. CONCLUSION： This study demonstrated that TCM integrated with chemotherapy may prolong overal survival and improve survival rate and life quality of patients with stage IV non-surgical gastric cancer
基金support of the program of Outstanding Young Scholars, the National Natural Science Foundation of China (No. 51371182)financially supported by Shenzhen Science and Technology Research funding (JCYJ20160608153641020)+3 种基金the National Basic Research Program of China (973 Program Project No. 2014CB643300)the National Natural Science Foundation (No. 51501203 and U1660118)the National Environmental Corrosion Platform (NECP)the “Young Merit Scholars” program of the Institute of Metal Research, Chinese Academy of Sciences
文摘The effect of copper addition to 2205 duplex stainless steel（DSS） on its resistance against pitting corrosion by the Pseudomonas aeruginosa biofilm was investigated using electrochemical and surface analysis techniques. Cu addition decreased the general corrosion resistance, resulting in a higher general corrosion rate in the sterile medium. Because DSS usually has a very small general corrosion rate, its pitting corrosion resistance is far more important. In this work, it was shown that 2205-3%Cu DSS exhibited a much higher pitting corrosion resistance against the P. aeruginosa biofilm compared with the 2205 DSS control, characterized by no significant change in the pitting potential and critical pitting temperature（CPT） values. The strong pitting resistance ability of 2205-3%Cu DSS could be attributed to the copper-rich phases on the surface and the release of copper ions, providing a strong antibacterial ability that inhibited the attachment and growth of the corrosive P. aeruginosa biofilm.
基金Supported by the the Natural Science Foundation of Hunan Province,China (2022J40262)the National Natural Science Foundation of China (12375046,12205254)。
文摘Black holes(BHs)exhibiting coordinate singularities but lacking essential singularities throughout the spacetime are referred to as regular black holes(RBHs).The initial formulation of RBHs was presented by Bardeen,who considered the Einstein equation coupled with a nonlinear electromagnetic field.In this study,we investigate the gravitational perturbations,including the axial and polar sectors,of the Bardeen(Anti-)de Sitter black holes.We derive the master equations with source terms for both axial and polar perturbations and subsequently compute the quasinormal modes(QNMs)through numerical methods.For the Bardeen de Sitter black hole,we employ the 6thorder WKB approach.The numerical results reveal that the isospectrality is broken in this case.Conversely,the QNM frequencies are calculated using the HH method for the Bardeen Anti-de Sitter black hole.
基金supported by the National Natural Science Foundation of China(21975132 and 21991143)the Fundamental Research Funds for the Central Universities(63196006)the PhD Candidate Research Innovation Fund of the School of Materials Science and Engineering,Nankai University。
基金supported by the National Key Research and Development Program of China(2020YFA0712102)the National Natural Science Foundation of China(52022094,22020102003,and 52072142)+1 种基金the Program of Science and Technology Development Plan of Jilin Province of China(20210101111JC and 20230508071RC)the Youth Innovation Promotion Association of Chinese Academy of Sciences(2019232)。
