检索结果-南通市图书馆

Nano Research 2024年第4期17卷 2420-2428页

作者： guangyong liu Yumiao Lu JunFeng Lu Yanlei Wang Shijing Liang Hongyan He Lilong Jiang National Engineering Research Center of Chemical Fertilizer Catalyst Fuzhou UniversityFuzhou 350002China CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Multiphase Complex SystemsBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China Longzihu New Energy Laboratory Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450000China

Electrocatalytic depolymerization of lignin into value-added chemicals offers a promising technique to make biorefining ***,we report a robust trimetallic PdNiBi electrocatalyst for reductive C–O bond cleavage of different lignin model dimers and oxidized lignin under mild *** reduction reaction proceeds with complete substrate conversion and excellent yields toward monomers of phenols(80%–99%)and acetophenones(75%–96%)in the presence of an ionic liquid electrolyte with operational *** experimental investigations together with density functional theory(DFT)calculations reveal that the outstanding performance of the catalyst results from the synergistic effect of the metal elements,which facilitates the easier formation of a key Cαradical intermediate and the facile desorption of the as-formed products at the *** results open up new opportunities for lignin valorization through the green electrocatalytic approach.

关键词： electrocatalytic depolymerization lignin Ionic liquids density functional theory(DFT)calculation

Recent Advances in Biomass-derived Porous Carbon Materials:Synthesis,Composition and Applications

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2024年第1期40卷 3-19页

作者： ZHAI Ziqi LU Yumiao liu guangyong DING Wei-Lu CAO Bobo HE Hongyan CAS Key Laboratory of Green Process and Engineering State Key Laboratory of Mesoscience and EngineeringBeijing Key Laboratory of Ionic Liquids Clean ProcessInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Longzihu New Energy Laboratory Zhengzhou Institute of Emerging Industrial TechnologyZhengzhou 450000P.R.China

Porous carbon materials(PCMs)play a pivotal role in diverse applications,such as energy storage,adsorption,catalysis,environmental remediation,and microwave *** selection of carbon precursors,in particular,is crucial for tailoring porous structures with specific ***,with its rich carbon feedstock,abundant availability,renewability,and versatile structures,has emerged as a promising precursor for porous carbon material *** review comprehensively summarizes the recent advances in biomass-derived porous carbon materials(BPCMs)encompassing synthetic strategy,morphology,structural composition,and multiple *** first review synthetic approaches aiming at regulating porosity,followed by morphological and composition features of BPCMs,with a special emphasis on elucidating the dimensional clarification and heteroatom doping *** discussion then extends to the wide-ranging applications of BPCMs,covering energy-related applications and CO_(2) adsorption to environmental ***,the review outlines the existing challenges and prospects in the *** summary,this review systematically describes BPCMs and provides valuable guidance for researchers to select and synthesize BPCMs that meet specific functional requirements.

关键词： Biomass Porous carbon Pyrolysis Heteroatom-doping Supercapacitor CO_(2)adsorption

Smart ionic liquid/water mixture system with dual stimuli-response to temperature and CO_(2)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Nano Research 2023年第3期16卷 4152-4159页

作者： Xiaoqing Yuan Ju liu Jingyu Qin Weili Ma guangyong liu Yanlei Wang Hongyan He Beijing Key Laboratory of Ionic Liquids Clean Process State Key Laboratory of Multiphase Complex SystemsCAS Key Laboratory of Green Process and EngineeringInstitute of Process EngineeringChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Innovation Academy for Green Manufacture Chinese Academy of SciencesBeijing 100190China

Stimuli-responsive materials have important applications in chemistry and chemical ***,we synthesized five different polyetheramine-fatty acids(PEFA)ionic liquids(ILs),possessing the dual stimuli-responsive ability to temperature and CO_(2).These PEFA ILs have reversible lower critical solution temperature(LCST)phase behavior over a wide temperature range of 37-91℃,and reversible heterogeneous-homogeneous phase transition towards the addition and removal of CO_(2).Furthermore,the droplet size of the IL-water mixture system increased from 6.5 to 21.0 nm as the temperature increased from 25 to 56℃,and then recovered to 6.5 nm when the temperature decreased to 25℃.The addition and removal of CO_(2)also reversibly modulated the droplet size of the *** from nuclear magnetic resonance(NMR)and Fourier transform infrared(FTIR)spectra further showed that the temperature-dependent conformation of polyether amine chain in the cation dominates the temperature response,while the reversible formation of bicarbonate and fatty acids(FA)from CO_(2)and anion controls the CO_(2)-based reversible phase *** simulations revealed a microscopic response mechanism of the IL-water system to temperature and CO_(2),and a synergistic effect between the dual stimuli of temperature and CO_(2).These findings may provide a basis for the rational design and understanding of ILs-based stimuli-responsive materials and nanoreactors.

关键词： stimuli-responsive ionic liquids phase transitions temperature CO_(2)

系统免疫炎症指数联合中性粒细胞淋巴细胞比值检测在晚期胃癌免疫治疗中的意义

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

国际外科学杂志 2024年第1期51卷 16-21页

作者：王振峰常俊朋隋德岭刘广勇山东省聊城市第二人民医院普通外科聊城252601

目的分析系统免疫炎症指数(SII)联合中性粒细胞淋巴细胞比值(NLR)在晚期胃癌PD-1/PD-L1抑制剂治疗中的意义。方法回顾性分析2020年1月—2023年1月接受免疫治疗的90例Ⅳ期胃腺癌患者的病例资料,其中男性70例,女性20例,年龄36~80岁,平均年... 详细信息

目的分析系统免疫炎症指数(SII)联合中性粒细胞淋巴细胞比值(NLR)在晚期胃癌PD-1/PD-L1抑制剂治疗中的意义。方法回顾性分析2020年1月—2023年1月接受免疫治疗的90例Ⅳ期胃腺癌患者的病例资料,其中男性70例,女性20例,年龄36~80岁,平均年龄(53.76±15.58)岁。收集患者的临床病理特征及随访资料。采用SPSS 26.0软件进行统计学分析。计算NLR、SII、PLR和MLR的临界值,分析不同标志物水平患者的总生存期和无进展生存期(PFS),确定PFS和总生存期的独立预测因素,评估危险因素对胃癌患者PFS和总生存期的预测价值。结果所有患者中位随访时间为27.3个月,中位PFS和总生存期分别为10.0个月和17.7个月。NLR和SII预测PFS和总生存期的曲线下面积(AUC)均>0.7,临界值NLR分别为4.75和3.85,SII分别为1154.67和887.90。高NLR、高MLR、高PLR和高SII患者的PFS和总生存期均低于低水平患者。ECOG PS≥1、高NLR和高SII是疾病进展或死亡的独立影响因素。NLR、ECOG PS和SII组合的AUC为0.761,预测效能高于任何单因素,危险因素数量越少的患者PFS和总生存期越长。结论在接受免疫治疗的晚期胃癌患者中,NLR和SII是PFS和总生存期的有效预测因素,治疗前检测NLR和SII能够为晚期胃癌免疫治疗提供可靠指导。

关键词：血清反应因子预后胃肿瘤

Efficacy and safety of PD-1 blockade plus long-course chemoradiotherapy in locally advanced rectal cancer(NECTAR):a multi-center phase 2 study

在线全文

学校读者我要写书评

暂无评论

Signal Transduction and Targeted Therapy 2024年第4期9卷 1721-1729页

作者： Zhengyang Yang Jiale Gao Jianyong Zheng Jiagang Han Ang Li Gang liu Yi Sun Jie Zhang guangyong Chen Rui Xu Xiao Zhang Yishan liu Zhigang Bai Wei Deng Wei He Hongwei Yao Zhongtao Zhang Department of General Surgery Beijing Friendship HospitalCapital Medical UniversityState Key Lab of Digestive HealthNational Clinical Research Center for Digestive DiseasesBeijingChina Department of Gastrointestinal Surgery The First Affiliated Hospital of Air Force Medical UniversityXi'anChina Department of General Surgery Beijing Chaoyang HospitalCapital Medical UniversityBeijingChina Department of General Surgery Beijing Xuanwu HospitalCapital Medical UniversityBeijingChina Department of General Surgery Tianjin Medical University General HospitalTianjinChina Department of Anorectal Tianjin People's HospitalTianjinChina Department of Radiology Beijing Friendship Hospital Capital Medical UniversityBeijingChina Department of Pathology Beijing Friendship HospitalCapital Medical UniversityBeijingChina Department of Thoracic Surgery/Institute of Thoracic Oncology West China HospitalSichuan UniversityChengduChina

Adding PD-1 blockade in the neoadjuvant regimens for locally advanced rectal cancer(LARC)patients with microsatellite stable(MsS)/mismatch repair-proficient(pMMR)tumors is an attractive,but debatable *** phase 2,multicenter,prospective,single-arm study enrolled patients from 6 centers from June 2021 to November *** advanced rectal cancer(LARC,cT_(3-4a)N_(0)M_(0) and cT_(1-4a)N_(1-2)M_(0))patients aged≥18 years with the distance from distal border of tumor to anal verge≤10 cm(identified by Magnetic Resonance Imaging)were qualifed for *** patients received long-course radiotherapy(50 Gy/25 fractions,2 Gy/fraction,5 days/week)and three 21-day cycles capecitabine(850-1000 mg/m2,bid,po,day1-14)and three 21-day cycles tislelizumab(200 mg,***,day8)as *** mesorectal excision(TME)was 6-12 weeks after the end of radiotherapy to achieve radical resection.A total of 50 patients were enrolled in this *** pathological complete response rate was 40.0%[20/50,95%confidence interval(CI):27.61-53.82%],while 15(30.0%,95%CI:19.1-43.75%),9(18.0%,95%CI:9.77-30.8%),2(4.0%,95%CI:1.10-13.46%)patients respectively achieved grade 1,2,and 3 tumor ***-related adverse events(TRAEs)occurred in 28(56.0%)LARC patients,including 26(52.0%)with grade I-II and 2(4.0%)with grade II(1 with grade 3 immune-related colitis and 1 with grade 3 rash).PD-1 blockade plus long-course chemoradiotherapy(CRT)showed promising therapeutic effects according to pathological complete response rate and is well-tolerated in LARC patients.A larger randomized controlled study is desired to further validate the above findings.

关键词： rectal cancer phase

基于OFDR的采动覆岩铰接结构回转角度及“三带”变形表征研究

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

煤炭科学技术 2024年第3期52卷 63-73页

作者：刘奇刘相林曹广勇赵金海蒋长宝山东科技大学能源与矿业工程学院山东青岛266590 山东省矿山灾害预防控制省部共建国家重点实验室培育基地山东青岛266590 安徽建筑大学建筑结构与地下工程安徽省重点实验室安徽合肥230601 重庆大学资源与安全学院重庆400044

为了研究陕北某矿采动覆岩结构的光纤应变表征方法,基于12217工作面工程地质条件,分析了OFDR(光频域反射技术)的应变监测原理,在采动覆岩运动状态分区和分布式光纤应变监测原理基础上,建立了水平光纤应变表征采动覆岩铰接结构回转角度... 详细信息

为了研究陕北某矿采动覆岩结构的光纤应变表征方法,基于12217工作面工程地质条件,分析了OFDR(光频域反射技术)的应变监测原理,在采动覆岩运动状态分区和分布式光纤应变监测原理基础上,建立了水平光纤应变表征采动覆岩铰接结构回转角度的力学分析模型,推导出应变峰值宽度与岩层破断后所形成采动覆岩铰接结构回转角度的函数关系,定义了铰接结构回转临界角度的概念,提出了基于光纤应变特性和采动覆岩铰接结构回转角度的覆岩“三带”划分判据,并采用光纤应变表征方法对采动覆岩应变特征进行分析。结果表明:采动覆岩“三带”的不同变形程度与铰接结构回转角度的大小呈正比例关系,因此通过铰接结构回转角度划分“三带”范围是可行的;通过水平光纤应变峰值特性计算铰接结构回转角度,与二维物理相似模型试验的近景摄影测量角度相比,两者平均误差小于1°,验证了提出的光纤应变表征采动覆岩铰接结构回转角度的力学模型有效性。二维物理相似模型得到的垮落带高度和裂隙带高度与该工作面现场结果一致,与理论计算数值吻合,符合该矿实际情况。研究结果为分布式光纤监测技术表征采动覆岩变形特征的应用提供了新的研究思路。

关键词：采动覆岩光频域反射回转角度光纤应变采动“三带”

脱贫地区公共景区市场势力与公共产品悖论及门票价格分类规制

在线全文

学校读者我要写书评

暂无评论

旅游学刊 2024年第1期39卷 117-129页

作者：邹光勇刘明宇高翔上海商学院酒店管理学院上海201400 复旦大学企业发展与管理创新研究中心上海200433 上海商学院财务金融学院上海201400

公共景区兼具市场势力和公共产品特征,导致了效率与公平的内在冲突,而脱贫地区公共景区合适的定价机制对建立景区运营提升与地方经济发展的相互促进机制非常重要。基于此,文章对公共景区经济性质进行辨析,以属地最大化社会福利、最大化... 详细信息

公共景区兼具市场势力和公共产品特征,导致了效率与公平的内在冲突,而脱贫地区公共景区合适的定价机制对建立景区运营提升与地方经济发展的相互促进机制非常重要。基于此,文章对公共景区经济性质进行辨析,以属地最大化社会福利、最大化政府税收和最大化景区经营者激励三大规制动机为基础,比较得出规制效果及脱贫政策影响效应,并分类提出规制原则、策略及适用条件,以此揭示脱贫地区公共景区分类规制机制和原理。文章剖析了脱贫地区公共景区门票价格及规制动机与平均运营成本的关系,并提出动态定价、脱贫资金投入与规制协同建设、价格规制中区分市场势力和地方政府非经济强制力等建议,有助于建立更加激励相容的系统规制方案,完善公共景区分类规制体系。

关键词：公共景区门票价格市场势力公共产品脱贫地区

在线全文

学校读者我要写书评

暂无评论

橡胶帘线复合材料界面失效机制

高分子材料科学与工程 2022年第11期38卷 88-95页

作者：郭晓辉袁晓静张泽刘广永邱贺方崔帆帆火箭军工程大学作战保障学院陕西西安710025 青岛科技大学橡塑材料与工程教育部重点实验室山东青岛266042

为研究对称角度铺设的橡胶帘线复合材料界面失效机制,采用有限元方法建立了代表性体积元,仿真橡胶帘线复合材料细观层面的应力分布,采用基于能量的Power-law准则仿真帘线与橡胶界面的损伤演化,发现界面的损伤由接触剪切应力与接触压力... 详细信息

为研究对称角度铺设的橡胶帘线复合材料界面失效机制,采用有限元方法建立了代表性体积元,仿真橡胶帘线复合材料细观层面的应力分布,采用基于能量的Power-law准则仿真帘线与橡胶界面的损伤演化,发现界面的损伤由接触剪切应力与接触压力引起。界面初始刚度为影响界面损伤演化的重要粘接界面参数,初始刚度与界面损伤演化变量正相关。帘线夹角增大会引起帘线所受转矩增大,导致界面失效加剧。

关键词：橡胶/帘线对称角度铺设有限元代表性体积元内聚力接触损伤演化

湿法混炼丁腈橡胶/高岭土复合材料的流变特性和力学性能

在线全文

学校读者我要写书评

暂无评论

弹性体 2023年第1期33卷 35-39页

作者：刘苏苏王辉蒋兴旺刘广永青岛科技大学橡塑材料与工程教育部重点实验室山东青岛266042

采用湿法混炼制备了丁腈橡胶/高岭土(NBR/Kaolin)复合材料,同时与传统干法混炼进行对比,研究了NBR/Kaolin复合材料的硫化特性、流变特性以及力学性能。结果表明,湿法混炼得到的NBR/Kaolin复合材料的交联程度较大,硫化时间较短,拉伸强度... 详细信息

采用湿法混炼制备了丁腈橡胶/高岭土(NBR/Kaolin)复合材料,同时与传统干法混炼进行对比,研究了NBR/Kaolin复合材料的硫化特性、流变特性以及力学性能。结果表明,湿法混炼得到的NBR/Kaolin复合材料的交联程度较大,硫化时间较短,拉伸强度和断裂伸长率更优异,其中拉伸强度提升了147%、断裂伸长率提升了36%。通过专门设计的橡胶加工分析(RPA)测试程序测定了NBR/Kaolin复合材料的流变特性,证明了湿法混炼工艺使NBR和Kaolin之间的相互作用更强,对应的NBR/Kaolin复合材料的力学性能也更加优异。

关键词：湿法混炼流变特性橡胶-填料相互作用丁腈橡胶/高岭土复合材料

接枝反应温度和时间对NBR/CNC-g-AA复合材料性能的影响

在线全文

学校读者我要写书评

暂无评论

弹性体 2023年第2期33卷 72-76页

作者：刘苏苏王辉洪子通刘广永青岛科技大学橡塑材料与工程教育部重点实验室山东青岛266042

利用溶液法,以硝酸铈铵为引发剂,将丙烯酸(AA)接枝到纤维素纳米晶(CNC)上进行改性得到接枝产物丙烯酸接枝纤维素纳米晶(CNC-g-AA),并且与丁腈橡胶(NBR)共混,制备NBR/CNC-g-AA复合材料,研究接枝反应温度和反应时间对NBR/CNC-g-AA复合材... 详细信息

利用溶液法,以硝酸铈铵为引发剂,将丙烯酸(AA)接枝到纤维素纳米晶(CNC)上进行改性得到接枝产物丙烯酸接枝纤维素纳米晶(CNC-g-AA),并且与丁腈橡胶(NBR)共混,制备NBR/CNC-g-AA复合材料,研究接枝反应温度和反应时间对NBR/CNC-g-AA复合材料硫化特性、力学性能和耐磨性能的影响。结果表明,CNC-g-AA在1720 cm-1处出现红外吸收峰,说明CNC-g-AA制备成功;接枝反应温度和反应时间对NBR/CNC-g-AA复合材料的硫化特性无明显影响规律,但是对其拉伸性能和耐磨性能有着不同影响规律,并且当接枝反应温度为35℃、反应时间为60 min时,NBR/CNC-g-AA复合材料的拉伸性能和耐磨性能均达到最优值。

关键词：纤维素纳米晶丁腈橡胶接枝反应力学性能