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CuMn_(2)O_(4)/石墨炔S型异质结上锚定氧化助催化剂促进曙红敏化光催化析氢

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Chinese Journal of Catalysis 2024年第1期56卷 88-103页

作者：杨成李鑫李梅梁桂杰靳治良北方民族大学化学与化学工程学院宁夏太阳能化学转化技术重点实验室国家民委化学工程与技术重点实验室宁夏银川750021 华南农业大学能源植物资源与利用农业农村部重点实验室生物质工程研究所广东广州510642 湖北文理学院低维光电材料与器件湖北省重点实验室湖北襄阳441053

半导体光催化剂有效的电荷分离及利用是光催化制氢的关键.单一半导体催化剂由于光生电子-空穴对的快速复合导致低的光催化活性,构建异质结是提高光生电荷分离以及电子转移效率的有效方法.此外,助催化剂的引入同样能够促进光催化剂表面... 详细信息

半导体光催化剂有效的电荷分离及利用是光催化制氢的关键.单一半导体催化剂由于光生电子-空穴对的快速复合导致低的光催化活性,构建异质结是提高光生电荷分离以及电子转移效率的有效方法.此外,助催化剂的引入同样能够促进光催化剂表面电子和空穴的分离,并且其协同效应可促使更多载流子流向相应的助催化剂位点而增强光催化性能.因此,同时构建异质结及合适的氧化位点成为解决光生电子-空穴对有效分离及利用的重要研究方向.本文报道了一种同时构建S型异质结和氧化位点促进CuMn_(2)O_(4)光生电子-空穴对有效分离及利用的可行性策略.虽然在制备CuMn_(2)O_(4)的过程中通过调控制备温度能够自身诱导生成具有氧化能力的Mn_(2)O_(3)来作为氧化位点,但是只存在氧化位点时不能很好地克服光生电子-空穴对的重组现象而导致光催化活性较低.基于此,本文巧妙地利用CuMn_(2)O_(4)自身诱导生成氧化位点的特性并引入石墨炔还原端而构建S型异质结,在氧化位点及S型异质结同时存在的情况下增强光生电子的有效转移.此外,在自身诱导生成氧化位点和S型异质结的协同作用下,促进了复合光催化剂中的光生电子和光生空穴精确定向迁移到相应的还原位点和氧化位点.傅里叶变换红外光谱和拉曼光谱证实成功制备了石墨炔.X射线衍射(XRD)、X射线光电子能谱(XPS)、扫描电子显微镜(SEM)和高分辨透射电子显微镜(TEM)等结果表明,成功制备了600-CuMn_(2)O_(4)/GDY-40%(6-CG-40%)样品(600°C焙烧,石墨炔质量百分含量为40%).经过组分优化的复合光催化剂6-CG-40%的催化性能达到1586.54μmol g^(‒1)h^(‒1),是CuMn_(2)O_(4)(106.73μmol g^(‒1)h^(‒1))和石墨炔(70.57μmol g^(‒1)h^(‒1))产氢活性的13.86倍和21.48倍高.利用UV-vis光谱、电化学性能和接触角测试等分析6-CG-40%复合光催化剂产氢性能提升的原因,并通过密度泛函理论计算和相关实验表征验证Mn_(2)O_(3)作为氧化助催化剂的合理性.结果表明,原位诱导生成的Mn_(2)O_(3)氧化助催化剂和引入石墨炔构建的S型异质结有效抑制了光生电子-空穴对的复合,从而优化了光生载流子转移效率,最终增强了曙红敏化6-CG-40%光催化析氢性能.综上所述,在控制诱导因子原位生成Mn_(2)O_(4)氧化助催化剂的基础上引入石墨炔还原端构建了S型异质结,在助催化剂与异质结两者的协同作用下极大程度地改善了光生电子-空穴对的严重复合现象,这项工作为解决光催化制氢领域中制约光催化剂制氢能力的关键问题提供了可行性思路.

关键词：石墨炔氧化助催化剂电荷分离 S型异质结光催化制氢

Vonoprazan-amoxicillin dual therapy for Helicobacter pylori eradication in Chinese population:A prospective,multicenter,randomized,two-stage study

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World Journal of Gastroenterology 2024年第27期30卷 3304-3313页

作者： Xue-Ping Huang Zhi-Hui Lin Yi-Juan Liu Shao-Wei Lin Yan-Feng Shao Feng Qiu Qing-Wu Qiu Zhang-Kun Xu jin-Xian Chen Liang-Huo Chen Zhen-Qun Lin Wen-Hua Dai Ming-Qing Zhang Qi Jiang Zhong-Qin Xiao Xian-Xing cheng Xiang-Fei Zhang Wen-Bin You Wei Chen Long-Qin Li Wei-Xing Lin Yong-Fu Wang Fu-jin Lai Long-Qun Chen Zhong-Hua Huang Wen-Qi Zheng jin-Qi Wei Department of Gastroenterology Shengli Clinical Medical College of Fujian Medical UniversityFuzhou 350000Fujian ProvinceChina Department of Gastroenterology Fujian Provincial HospitalFuzhou 350001Fujian ProvinceChina Department of Gastroenterology The First Affiliated Hospital of Fujian Medical UniversityFuzhou 350000Fujian ProvinceChina School of Public Health Fujian Medical UniversityFuzhou 350000Fujian ProvinceChina Department of Gastroenterology The Third People’s Hospital of Fujian ProvinceFuzhou 350000Fujian ProvinceChina Department of Gastroenterology Fujian Provincial Hospital North Brance Fujian Provincial Geriatric HospitalFuzhou 350000Fujian ProvinceChina Department of Gastroenterology Xiaoao HospitalFuzhou 350000Fujian ProvinceChina Department of Gastroenterology The General Hospital of Fujian Energy GroupFuzhou 350000Fujian ProvinceChina Department of Gastroenterology The Second Hospital of ZhangzhouZhangzhou 363000Fujian ProvinceChina Department of Gastroenterology Anxi Country HospitalQuanzhou 362000Fujian ProvinceChina Department of Gastroenterology Zhangzhou Municipal Hospital of TCMZhangzhou 363000Fujian ProvinceChina Department of Gastroenterology Zhangpu HospitalZhangzhou 363000Fujian ProvinceChina Department of Gastroenterology The Affiliated Dongnan Hospital of Xiamen UniversityZhangzhou 363000Fujian ProvinceChina Department of Gastroenterology First Hospital of Nanping CityNanping 353000Fujian ProvinceChina Department of Gastroenterology Fujian Nanping Second HospitalNanping 353000Fujian ProvinceChina Department of Gastroenterology Wuyishan Municipal HospitalNanping 353000Fujian ProvinceChina Department of Gastroenterology Fuzhou Changle District HospitalFuzhou 350000Fujian ProvinceChina Department of Gastroenterology Changle City Second HospitalFuzhou 350000Fujian ProvinceChina Department of Gastroenterology Jinjiang Municipal HospitalQuanzhou 362000Fujian ProvinceChina Department of Gastroenterology Fuding Hospital Affiliated to Fuj

BACKGROUND The efficacy of Vonoprazan-amoxicillin dual therapy(VAT)in the treatment of Helicobacter pylori(***)is *** To evaluate the efficacy of VAT in the Chinese *** This prospective,multicenter,randomized,open-label,and two-stage study was conducted at 23 centers in Fujian,China(May 2021-April 2022).***-infected patients were randomized to bismuth quadruple therapy(BQT),BQT-Vonoprazan(BQT-V),seven-day VAT(VAT-7),ten-day VAT(VAT-10),and fourteen-day VAT(VAT-14)*** primary endpoint was the *** eradication *** secondary endpoint was the frequency of adverse *** study was registered with the Chinese Clinical Trial Registry,*** In the first stage,VAT-7 and BQT-V groups were selected for early termination because less than 23 among 28 cases were *** the second stage,the eradication rates for BQT,VAT-10,and VA-14 were 80.2%[95%confidence interval(95%CI):71.4%-86.8%],93.2%(86.6%-96.7%),92.2%(85.3%-96.0%)in the intention-to-treat(ITT)analysis,and 80.9%(95%CI:71.7%-87.5%),94.0%(87.5%-97.2%),and 93.9%(87.4%-97.2%)in the per-protocol *** ITT analysis showed a higher eradication rate in the VAT-10 and VAT-14 groups than in the BQT group(P=0.022 and P=0.046,respectively).The incidence of adverse events in the VAT-10 and VAT-14 groups was lower than in the BQT group(25.27%and 13.73%vs 37.62%,respectively;P<0.001).CONCLUSION VAT with a duration of 10 or 14 days achieves a higher eradication rate than the BQT,with a more tolerable safety profile in ***-infected patients in *** XP et *** for *** eradication.

关键词： Helicobacter pylori Vonoprazan Amoxicillin Dual therapy Bismuth quadruple therapy

基于探究社区理论的高职学生在线学习投入实证研究

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职业技术教育 2024年第17期45卷 39-44页

作者：黄志刚靳诚常州工业职业技术学院常州213164 南京师范大学南京210023

对378位高职生问卷调查的数据分析,结果显示,三种临场对高职生在线学习投入分别具有显著的正向影响;班级氛围在社会临场和认知临场对在线学习投入影响中分别起部分中介效应,在教学临场对在线学习投入影响中起完全中介效应;性别在社会临... 详细信息

对378位高职生问卷调查的数据分析,结果显示,三种临场对高职生在线学习投入分别具有显著的正向影响;班级氛围在社会临场和认知临场对在线学习投入影响中分别起部分中介效应,在教学临场对在线学习投入影响中起完全中介效应;性别在社会临场、认知临场与在线学习投入之间分别起调节效应,男生比女生的影响程度均更大;性别在教学临场对在线学习投入影响中不具有调节效应。基于此提出:利用平台大数据,完善学生学习投入和教师教学设计综合评价;扩大在线学习活动参与性,提高学业自我效能感;梳理多元化生源特点,提升在线学习投入效果。

关键词：探究社区理论高职生在线学习投入班级氛围

Experimental investigation of vibration pretreatment-microwave curing process for carbon fiber reinforced resin matrix composites

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Journal of Central South University 2024年第6期31卷 1838-1855页

作者： ZHANG De-chao ZHAN Li-hua MA Bo-lin YAO Shun-ming GUO jin-zhan GUAN cheng-long LIU Shu Light Alloys Research Institute Central South UniversityChangsha 410083China College of Mechanical and Electrical Engineering Central South UniversityChangsha 410083China School of Mechanical Engineering and Automation Fuzhou UniversityFuzhou 350108China

The vibration pretreatment-microwave curing process is an efficient,low energy consumption,and high-quality out-of-autoclave curing process for carbon fiber resin matrix *** study aims to investigate the impact of vibration pretreatment temperature on the fiber weight content,microscopic morphology and mechanical properties of the composite laminates by using optical digital microscopy,universal tensile testing machine and thermo-gravimetric ***,the combined mode of Bragg fiber grating sensor and temperature measurement fiber was employed to explore the effect of vibration pretreatment on the strain process during microwave *** study results revealed that the change in vibration pretreatment temperature had a slight impact on the fiber weight content when the vibration acceleration remained *** metallographic and interlaminar strength of the specimen formed at a vibration pretreatment temperature of 80℃ demonstrated a porosity of 0.414% and a 10.69% decrease in interlaminar shear strength compared to autoclave ***,the introduction of the vibration energy field during the microwave curing process led to a significant reduction in residual strain in both the 0°and 90°fiber directions,when the laminate was cooled to 60℃.

关键词： vibration microwave curing porosity interlaminar shear strength thermo-gravimetric analysis curing strain

Limonin inhibits the stemness of cancer stem-like cells derived from colorectal carcinoma cells potentially via blocking STAT3 signaling

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World Journal of Clinical Oncology 2024年第2期15卷 317-328页

作者： Wei-Feng Zhang cheng-Wei Ruan Jun-Bo Wu Guo-Liang Wu Xiao-Gan Wang Hong-jin Chen Department of Colorectal Surgery The Affiliated Hospital of Nanjing University of Chinese MedicineNanjing 210029Jiangsu ProvinceChina Department of Anorectal Section The Affiliated Hospital of Xuzhou Medical UniversityXuzhou 221000Jiangsu ProvinceChina Department of Colorectal Surgery Hengyang Central HospitalHengyang 421000Hunan ProvinceChina The First College for Clinical Medicine Nanjing University Of Chinese MedicineNanjing 210023Jiangsu ProvinceChina

BACKGROUND Limonin is one of the most abundant active ingredients of Tetradium *** exerts antitumor effects on several kinds of cancer ***,whether limonin exerts antitumor effects on colorectal cancer(CRC)cells and cancer stem-like cells(CSCs),a subpopulation responsible for a poor prognosis,is *** To evaluate the effects of limonin on CSCs derived from CRC *** CSCs were collected by culturing CRC cells in serum-free *** cytotoxicity of limonin against CSCs and parental cells(PCs)was determined by cholecystokinin octapeptide-8 *** effects of limonin on stemness were detected by measuring stemness hallmarks and sphere formation *** As expected,limonin exerted inhibitory effects on CRC cell behaviors,including cell proliferation,migration,invasion,colony formation and tumor formation in soft agar.A relatively low concentration of limonin decreased the expression stemness hallmarks,including Nanog andβ-catenin,the proportion of aldehyde dehydrogenase 1-positive CSCs,and the sphere formation rate,indicating that limonin inhibits stemness without presenting ***,limonin treatment inhibited invasion and tumor formation in soft agar and in nude ***,limonin treatment significantly inhibited the phosphorylation of STAT3 at Y705 but not S727 and did not affect total STAT3 *** of Nanog andβ-catenin expression and sphere formation by limonin was obviously reversed by pretreatment with 2μmol/L *** Taken together,these results indicate that limonin is a promising compound that targets CSCs and could be used to combat CRC recurrence and metastasis.

关键词： Limonin Colorectal cancer STAT3 signaling Cancer stem-like cells STAT3 Aldehyde dehydrogenase 1

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宋代明州碶水利工程考析

宁波大学学报（人文科学版） 2024年第4期37卷 61-69页

作者：金城淮南师范学院马克思主义学院

宋代明州碶水利工程多以石材修筑而成,既可以防止河湖泛滥、治理内涝,又可以利用淡水冲洗滨海卤壤,降低碱卤浓度,具有显著的水利效益。碶水利工程与海塘、湖泊、堰闸等中小型水利工程共同构成有效水利网络,为当地农田灌溉提供了有力保障... 详细信息

宋代明州碶水利工程多以石材修筑而成,既可以防止河湖泛滥、治理内涝,又可以利用淡水冲洗滨海卤壤,降低碱卤浓度,具有显著的水利效益。碶水利工程与海塘、湖泊、堰闸等中小型水利工程共同构成有效水利网络,为当地农田灌溉提供了有力保障,促进了农业生产力水平的提高,为宋代明州社会经济发展奠定基础。

关键词：宋代明州碶水利工程经济效益

Preparation of new hyper cross-linked chelating resin for adsorption of Cu^(2+) and Ni^(2+) from water

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Chinese Chemical Letters 2012年第2期23卷 245-248页

作者： cheng cheng jin Nan Wang Li Xu ai Min Li State Key Laboratory of Pollution Control and Resource Reuse Nanjing UniversityNanjing 210046China School of the Environment Nanjing UniversityNanjing 210046China

The new hyper cross-linked chelating resin NDWJN2 modified with carboxyl groups was prepared for removal of Cu^（2＋） and Ni^（2＋） from ***2 was characterized using BET,SEM and FT-IR *** with commercial resins D113 and IRC84,NDWJN2 could remove Cu^（2＋） and Ni^（2＋） from water more *** model could fit adsorption isotherms well.

关键词： Preparation Hyper cross-linked chelating resin Adsorption Cu^(2+) Ni^(2+)

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高气压下三维旋转滑动弧放电光谱特性分析

光谱学与光谱分析 2024年第6期44卷 1571-1577页

作者：张磊张登成于锦禄赵兵兵徐哲霖程伟达中国人民解放军空军工程大学航空工程学院陕西西安710038

为探究气体压力对滑动弧放电稳定性的影响规律,在高气压放电实验平台上,开展了滑动弧放电光谱特性研究。利用发射光谱法对滑动弧放电过程中的激发态物质进行诊断,并对不同气体压力条件下滑动弧放电的电子密度、振动温度、转动温度进行... 详细信息

为探究气体压力对滑动弧放电稳定性的影响规律,在高气压放电实验平台上,开展了滑动弧放电光谱特性研究。利用发射光谱法对滑动弧放电过程中的激发态物质进行诊断,并对不同气体压力条件下滑动弧放电的电子密度、振动温度、转动温度进行了计算。在滑动弧放电发射光谱中观测到氮气第二正带系N_(2)(C^(3)Π_(u)→B^(3)Π_(g))和氮气第一负带系N^(+)_(2)(B^(2)Σ^(+)_(u)→X^(2)Σ^(+)_(g))的发射谱线,随着气体压力升高,氮气第二正带系谱线发射强度增强,氮气第一负带系的发射强度变化幅度较小。当气体压力超过0.26 MPa之后,在滑动弧放电发射光谱中发现了氮气Gaydon s Green带系507.4 nm的发射谱线,其发射强度为3508.49 arb,随气体压力升高其谱线发射强度无明显变化。利用Stark展宽法对滑动弧放电过程中的电子密度进行了计算,得到电子密度在1023量级,并且随着气体压力的增加,滑动弧放电的电子密度呈线性增加。针对氮气分子第二正带系的5条谱线,采用玻尔兹曼图解法对滑动弧放电的振动温度进行计算,振动温度随气体压力的变化并非单调变化,在0.3 MPa之前振动温度变化幅度较小,气体压力超过0.3 MPa之后振动温度迅速增加。对氮气分子第一负带系390~391.6 nm处的发射谱线进行拟合计算滑动弧放电的转动温度,结果表明在0.24 MPa之前转动温度随气体压力升高变化幅度较大,气体压力超过0.24 MPa之后转动温度增长幅度变小。

关键词：滑动弧等离子体高气压放电电子密度振动温度转动温度

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人工智能多元研发模式研究

科学学研究 2024年第9期42卷 1897-1906,1927页

作者：施锦诚王迎春上海人工智能实验室治理研究中心上海200232

人工智能科技突破亟须探究研发模式系统布局。本文从研发组织方式和战略导向两个维度构建人工智能研发模式理论分析框架,运用多案例比较法,研究发现:人工智能研发组织聚焦创新链不同环节,在理论原创、关键核心技术攻关、开放生态建设、... 详细信息

人工智能科技突破亟须探究研发模式系统布局。本文从研发组织方式和战略导向两个维度构建人工智能研发模式理论分析框架,运用多案例比较法,研究发现:人工智能研发组织聚焦创新链不同环节,在理论原创、关键核心技术攻关、开放生态建设、行业前沿探索上各有侧重,形成“创新探索者”“攻关主导者”“生态赋能者”“行业引领者”四类研发角色。通过对研发角色的画像分析,发现研发主体间存在角色差异性。研究结论对我国从国家创新体系层面推进人工智能研发系统布局、提升人工智能科技创新体系协同效能具有参考意义。

关键词：人工智能研发组织研发模式国家创新体系