检索结果-南通市图书馆

铋纳米颗粒负载的氮掺杂石墨毡用于稳定高效的铁铬液流电池

在线全文

学校读者我要写书评

暂无评论

新型炭材料（中英文） 2024年第1期39卷 131-141页

作者：车航欣高宇飞杨家辉洪崧郝磊端徐亮 Sana Taimoor Alex WRobertson 孙振宇北京化工大学化学工程学院有机-无机复合材料国家重点实验室北京100000 桂林电子科技大学机电工程学院广西桂林541000 Department of Physics University of WarwickCoventry CV47ALUK

铁铬氧化还原液流电池(ICRFB)是一种具有成本效益的可规模化储能系统,其利用资源丰富、低成本的铬和铁作为电解液的活性物质。然而,ICRFB存在Cr^(3+)/Cr^(2+)电化学活性低、负极易产生严重的析氢反应(HER)等问题。本文报道了一种简单的... 详细信息

铁铬氧化还原液流电池(ICRFB)是一种具有成本效益的可规模化储能系统,其利用资源丰富、低成本的铬和铁作为电解液的活性物质。然而,ICRFB存在Cr^(3+)/Cr^(2+)电化学活性低、负极易产生严重的析氢反应(HER)等问题。本文报道了一种简单的合成策略,即通过自聚合和湿化学还原方法结合煅烧处理,在氮掺杂石墨毡(GF)表面沉积了非晶态铋(Bi)纳米颗粒(NPs),其作为ICRFB的负极材料时可展示出高效的电化学性能。生成的BiNPs与H+形成中间体,极大地抑制了HER副反应。此外,Bi的引入和GF表面的N掺杂通过协同作用显著提高了Fe^(2+)/Fe^(3+)和Cr^(3+)/Cr^(2+)的电化学活性,降低了电荷传递电阻,提高了反应传质速率。在不同的电流密度下,经25次循环,库仑效率仍高达97.7%。在60.0 mA cm^(-2)电流密度下,能量效率达到85.8%,超过了许多其他报道的材料。循环100次后容量达到862.7 mAh/L,约为GF的5.3倍。

关键词：铁铬液流电池 Bi 负极氮掺杂石墨毡

人力资源服务业高质量发展与新质生产力培育——逻辑机理、实施路径和关键举措

在线全文

学校读者我要写书评

暂无评论

中国劳动 2024年第1期 64-75页

作者：战梦霞高雨菲中国劳动和社会保障科学研究院北京100029 武汉大学弘毅学堂武汉430072

新质生产力作为引领新时代经济发展的新范式,是实现中国式现代化的重要手段。为了加快培育新质生产力,必须以产业创新为内生动力来推动构建现代化产业体系。其中,人力资源服务业作为典型的现代服务业,不仅是实施创新驱动发展战略、就业... 详细信息

新质生产力作为引领新时代经济发展的新范式,是实现中国式现代化的重要手段。为了加快培育新质生产力,必须以产业创新为内生动力来推动构建现代化产业体系。其中,人力资源服务业作为典型的现代服务业,不仅是实施创新驱动发展战略、就业优先战略和人才强国战略的重要抓手,而且还能与战略性新兴产业、未来产业实现融合发展来共同构建现代化产业体系。然而,当前人力资源服务业与高质量发展的要求相比还存在一定差距,需要立足产业内部“质的提升”以及与其他产业“量的加成”来共同推进产业创新,并通过采取加大改革力度,深化与实体经济协同发展,建立高标准服务市场体系,推进“多链”深度融合,优化人力资源市场配置,以及开展“数字双创”活动等措施来满足高质量发展的要求,才能为新质生产力培育提供有力支撑。

关键词：人力资源服务业新质生产力高质量发展创新现代化产业体系

A Novel Plasticizer for the Preparation of Thermoplastic Starch

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第1期17卷 133-136页

作者： Jin Hui YANG Jiu gao yu Xiao fei MA School of Science Tianjin University Tianjin 300072

in this paper, ethylenebisformamide was synthesized and used as a novel plasticizer for cornstarch to prepare thermoplastic starch （TPS）. FT-IR expressed that ethylenebisformamide formed stronger and stable hydrogen bond with starch molecules compared to the native cornstarch. X-ray diffraction （XRD） showed that the typical A-style crystallinity in the native starch has been destructed. By scanning electron microscope （SEM） native cornstarch granules were proved to transfer to a homogeneous system. After being stored for one week at RH=33%, the mechanical properties of EPTPS was also studied. The elongation reached to 264% utmost. As a novel plasticizer, ethylenebisformamide would be practical to extend TPS application scopes.

关键词： Thermoplastic starch ethylenebisformamide novel plasticizer.

An efficient and facile procedure for synthesis of octyl polyglucoside

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2007年第10期18卷 1173-1175页

作者： Ying Wu Jiu gao yu Xiao fei Ma Jian She Zhang Department of Chemistry School of Science Tianjin University Tianjin 300072 China

Nonionic surfactant alkyl polyglucoside （APG） was prepared by direct glycosidation of alkyl alcohol with glucose in the presence of sulfate acid-silica gel （H2SO4/SiO2） as solid acidic catalyst. The quantity of catalyst was only of 1 wt%, based on the glucose, and the conversion of glucose was close to 100% at 110 ℃ in 1.5 h. The product was characterized by FT-IR, mass and ^1H NMR spectra. The degree of polymerization （DP） of the glucose in the product was 1.37, and critical micelle concentration （CMC） of product was only 0.0104 wt%.

关键词： Alkyl polyglucoside Sulfate acid-silica gel Solid acidic Catalyst

Expression of RNA Editing Deaminase on Human Glioma Cell Lines

在线全文

学校读者我要写书评

暂无评论

Chemical Research in Chinese Universities 2006年第2期22卷 233-235页

作者： TIAN yu PAN yu-zuo gao yu-fei LI Gui-lin ZHAO Xing-li gao Jun LI Gui-ying ZHANG Xing-yi WANG Ren-zhi Chinese-Japan Friendship Hospital School of Basic Medical Sciences Jilin University Changchun 130012P. R. China Department of Neurosurgery Peking Union Medical College Hospital Beijing 100070P. R. China Key Laboratory for Molecular Enzymology and Engineering of Ministry of Education The Second Hospital of Jilin University Changchun 130012 P. R. China

To study the expression of RNA editing deaminases ADAR2 and ADAR3 in different malignant glioma cell lines and the effect of phenylacetate on the expression of these genes, the primarily glial cells of human brain tissue were isolated and cultured. The human glioma SHG-44, U-251, BT-325 cell lines were maintained in culture. The expressions of ADAP,.2 and ADAR3 mRNA were detected by the semiquantitative reverse transcription-polymerase chain reaction（RT-PCR）. The changes in ADAR2 mRNA expression before and after phenylacetate treatment were detected by RT-PCR and image analysis. The level of ADAR gene expression is expressed as the ratio expression rate（RER） of ADAR gene to β-actin according to computer image analysis. ADAR2 displays moderate expression in glial cells, low expression in low-grade malignant glioma SHG-44 cells, and high level expression in high-grade malignant glioma U-251and BT-325 cells. The expression of ADAR2 can be decreased by phenylacetate treatment in glioma U-251 cells. ADAR3 is not expressed in normal brain glial cells, or glioma SHG-44, U-251 and BT-325 cells before and after phenylacetate treatment. The enhanced expression of ADAR2 may be involved in the tumor progression of malignant glioma. Phenylacetate can decrease the expression of ADAR2 in glioma cells, suggesting that it may act on the RNA editing process in glioma.

关键词： Glioma ADAR RT-PCR RNA editing deaminase

Urinary metabonomics of stomach cancer assessed by rapid resolution liquid chromatography/time-of-flight mass spectrometry

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2013年第10期126卷 1930-1933页

作者： ZHANG Yan REN Hui JIANG Yang gao yu- fei LIU Shu-ying Department of General Surgery Second Hospital of Jilin UniversityChangchun Jilin 130000 China Department of Colorectal and Anal SurgeryChina-Japan Union-Hospital of JilinUniversity Changchun Jilin 130033 China Departmentof NeurosurgeryChina-Japan Union-Hospital of JilinUniversity Changchun Jilin 130033 China Department of Jilin Ginseng Academy Changchun University ofChinese Medicine Jilin 13 0117 China

Background Stomach cancer is among the most commonly occurring malignancies worldwide. It would be beneficial to develop a urine-based assay whereby patients with undiagnosed stomach cancer could be screened and their cancer detected in the eadiest stages. Methods A urinary metabonomics method based on ultra-performance liquid chromatography combined with quadruple time-of-flight mass spectrometry was used to analyze urine samples from patients with stomach cancer and healthy controls. Results Statistical analysis revealed a clear separation of patients and healthy controls using the aforementioned methodology. Some significantly changed metabolites were identified. Conclusions Use of the metabonomics method in patients with stomach cancer could effectively detect distinct changes in urinary metabolites and had the capacity to detect cancer; therefore, it may be a valuable tool in earlier diagnosis. Furthermore, the detection and identification of altered metabolites in the current study may help elucidate possible mechanisms involved in stomach cancer.

关键词： stomach cancer, metabonomics rapid resolution liquid chromatography-quadruple time of flight massspectrometry, biomarker

Strain-enhanced polarization sensitivity inβ-Ga_(2)O_(3)photodetector

在线全文

学校读者我要写书评

暂无评论

Science China(Physics,Mechanics & Astronomy) 2024年第4期67卷 126-137页

作者： Yonghui Zhang Huili Liang fei Xing Qiqian gao yu Feng yuping Sun Zengxia Mei School of Physics and Optoelectronic Engineering Shandong University of TechnologyZibo 255000China Songshan Lake Materials Laboratory Dongguan 523808China Institute of Physics Chinese Academy of SciencesBeijing 100190China

Polarization-sensitive photodetection and imaging have great application value in fields such as polarization division multiplexing optical communication,remote sensing,near-field imaging and military *** a high polarization ratio has always been the research hotspot in polarization-sensitive *** this paper,we report a compression strain enhanced polarization ratio inβ-gallium oxide(β-Ga_(2)O_(3))single crystal flake.A rigorous crystallographic analysis confirmed its high crystalline quality and ***-resolved polarization Raman spectroscopy(ARPRS)was adopted to study the anisotropy of its optical *** ARPRS measurements and theoretical calculation consistently demonstrate the strong optical anisotropy in the high-qualityβ-Ga_(2)O_(3)flake.A polarization ratio of 0.96 was obtained in the flatβ-Ga_(2)O_(3)***,mechanical strain of±0.7%was introduced intoβ-Ga_(2)O_(3).An increased polarization ratio of 0.98 was achieved in the case of 0.7%compression strain,which is,to the best of our knowledge,the highest value for UVC polarization-sensitive *** corresponds to an improved polarization rejection ratio of *** work proposed a new path towards improving polarization sensitivity by applying strain engineering in the active material.

关键词： gallium oxide polarization photodetector anisotropy strain

Local hypothermia and optimal temperature for stroke therapy in rats

在线全文

学校读者我要写书评

暂无评论

Chinese Medical Journal 2009年第13期122卷 1558-1563页

作者： WU Hao JIANG Li-dan Karsten H. Wrede JI Xun-ming ZHAO Xi-qing TIAN Xin gao yu-fei LING Feng Department of Neurosurgery Xuan Wu Hospital Capital Medical University Beijing 100053 China Departement of Neurosurgery International Neuroscience Institute Rudolf Pichlmayr Str. 4 30625 Hannover Germany Department of Neurosurgery the People Hospital of Tangshan Tangshan Hebei 063000 China Central Lab Xuan Wu Hospital Capital Medical University Beijing 100053 China Department of Neurosurgery China-Japan Union Hospital Ji Lin University Changchun Jilin 130033 China

Background Local hypothermia induced by intravascular infusion of cold saline solution effectively reduces brain damage in stroke. We further determined the optimal temperature of local hypothermia in our study. Methods Seventy-eight adult male Sprague Dawley rats （260-300 g） were randomly divided into 3 groups： group A, ischemia/reperfusion without cold saline infusion （n=26）（control group）; group B, infusion with 20℃ saline before reperfusion （n=26）; group C： infusion with 10℃ saline before reperfusion （n=26）. In each group, we chose 15 rats for monitoring physical indexes and the temperature of the brain （cortex and striatum） and body （anus）, measurement of brain infarction volume, assessment of neurological deficits and the survival rate of reperfusion at 48 hours. Another 8 rats from each group was chosen for examining brain edema, another 3 from each group for histological observation by electron microscopy （EM） and light microscopy （LM） at 48 hours after reperfusion. Results There was no significant difference among the 3 groups for physical indexes during the examination （F（2. 45）= 0.577, P=0.568; F（2.45）= 0.42, P=0.78 for blood pressure and blood gas analysis, respectively）. The brain temperature was significantly reduced in the group C compared to the other groups （F（2.45）=37.074, P=0.000; F（2.45）=32.983, P=0.000, for cortex and striatum temperature respectively）, while the difference in rectal temperature between group A and B or C after reperfusion was not significant （F（2.45）= 0.17115,P=0.637）. And the brain infarct volume was significantly reduced in group C （from 40%±10% in group A, 26%±8% in group B, to 12%±6% in group C, F（2.45）=43.465, P=0.000） with the neurological deficits improving in group C （Х^2=27.626, P=0.000）. The survival rate at 48 hours after 10℃ and 20℃ saline reperfusion was increased by 132.5% and 150%, respectively, as compared to the control group （Х^2=10.489, P=0.005）. The extent of the brain edema showed no significant difference

关键词： rat middle cerebral artery occlusion intra-arterial hyperthermia ischemia/reperfusion injury

Engineering molecular regulation for SiO_(x) with long-term stable cycle and high Coulombic efficiency as lithium-ion battery anodes

在线全文

学校读者我要写书评

暂无评论

Rare Metals 2024年第2期43卷 588-598页

作者： fei Wang Han gao Zhao-yu Niu Yao-Peng Zheng Ming-Yan Chuai Jia-Nan Xu State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun130022China University of Science and Technology of China Hefei230026China

In the current situation where the practical application of silicon anode materials encounters great challenges,silicon oxide(SiO_(x),0≤x≤2)has attracted the attention of researchers due to its relatively small volume expansion,stable cycling performance,and low cost,which is possible to realize commercial applications earlier than silicon ***,it remains a challenge to prepare SiO_(x)materials with long-term stable cycling performance and high Coulombic efficiency using low-cost *** this work,SiO_(x)anode material with high Coulombic efficiency and good long-term cycling stability was prepared at a low cost by hydrolysis of siloxane and in situ polymerization of phenolic *** hydrolysis of siloxane was further regulated by different silane coupling agents to regulate the size and microstructure of prepared SiO_(x)materials,which displayed the substantially improved electrochemical *** excellent electrochemical performance of SiO_(x)prepared by regulated hydrolysis of siloxane with silane coupling agents is attributed to the effect of silane coupling agent on size and microstructure of SiO_(x),revealing that the strategy of modulating the hydrolysis of siloxane by silane coupling agent is a potential method to prepare high-performance SiO_(x)materials.

关键词： Hydrolysis Silane coupling agent Long cycle SiO_(x) anode Lithium-ion battery(LIB)