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Binder-free Li-O_(2)battery cathodes using Ni-and PtRu-coated vertically aligned carbon nanofibers as electrocatalysts for enhanced stability

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Nano Research Energy 2023年第2期2卷 229-239页

作者： Syed Shoaib Hassan Zaidi Sabari Rajendran Archana sekar Ayyappan Elangovan Jun Li Xianglin Li Department of Mechanical Engineering University of KansasLawrenceKS 66045USA Department of Chemistry Kansas State UniversityManhattanKS 66506USA Department of Mechanical Engineering and Materials Science Washington University in St.LouisSt.LouisMO 63130USA

The development of an ideal cathode for Li-O_(2)battery(LOB)has been a great challenge in achieving high discharge capacity,enhanced stability,and *** formation of undesired and irreversible discharge products on the surface of current cathode materials limit the life span of the *** this study,we report the systematic electrochemical study to compare the performance of LOB employing a unique graphitic nanostructured carbon architecture,i.e.,vertically aligned carbon nanofiber(VACNF)arrays,as the cathode *** metal(Ni)and noble metal alloy(PtRu)are further deposited on the VACNF array as electrocatalysts to improve the discharge/charge processes at the *** structure of as-prepared electrodes was examined with the field emission scanning electron microscopy,high-resolution transmission electron microscopy,and X-ray photoelectron spectroscopy(XPS).The LOB with VACNF-Ni electrode delivered the highest specific and areal discharge capacities(14.92 Ah·g^(−1),4.32 mAh·cm^(−2))at 0.1 mA·cm^(−2)current density as compared with VACNF-PtRu(9.07 Ah·g^(−1),2.62 mAh·cm^(−2)),bare VACNF(5.55 Ah·g^(−1),1.60 mAh·cm^(−2))and commercial Vulcan XC(3.83 Ah·g^(−1),1.91 mAh·cm^(−2)).Cycling stability tests revealed the superior performance of VACNF-PtRu with 27 cycles as compared with VACNF-Ni(13 cycles),VACNF(8 cycles),and Vulcan XC(3 cycles).The superior cycling stability of VACNF-PtRu can be attributed to its ability to suppress the formation of Li2CO3 during the discharge cycle,as elucidated by XPS analysis of discharged *** also investigated the impact of carbon cloth and carbon fiber as cathode electrode substrate on the performance of LOB.

关键词： lithium oxygen battery vertically aligned carbon nanofibers Ni PtRu cathodes stability

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A novel preoperative inflammatory marker prognostic score in patients with localized and metastatic renal cell carcinoma

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Asian Journal of Urology 2017年第4期4卷 230-238页

作者： Rishi R.sekar Dattatraya Patil Yoram Baum Jeffrey Pearl Anna Bausum Mehmet A.Bilen Omer Kucuk Wayne B.Harris Bradley C.Carthon Mehrdad Alemozaffar Christopher P.Filson John G.Pattaras Peter T.Nieh Kenneth Ogan Viraj A.Master Department of Urology Emory University School of MedicineAtlantaGAUSA Department of Hematology and Medical Oncology Emory University School of MedicineAtlantaGAUSA Winship Cancer Institute of Emory University Emory University School of MedicineAtlantaGAUSA The Atlanta VA Medical Center Emory University School of MedicineAtlantaGAUSA

Objective:Several inflammatory markers have been studied as potential biomarkers in renal cell carcinoma(RCC),however few reports have analyzed their prognostic value in aggregate and in non-clear cell *** hypothesize that a combination of specific inflammatory markers into an RCC Inflammatory Score(RISK)could serve as a rigorous prognostic indicator of overall survival(OS)in patients with clear cell and non-clear cell ***:Combination of preoperative C-reactive protein(CRP),albumin,erythrocyte sedimentation rate(ESR),corrected calcium,and aspartate transaminase to alanine transaminase(AST/ALT)ratio was used to develop *** was developed using grid-search methodology,receiver-operating-characteristic(ROC)analysis,and sensitivity-specificity trade-off *** value of RISK was analyzed using the KaplaneMeier method and Cox proportional regression *** accuracy was compared with RISK to Size,Size,Grade,and Necrosis(SSIGN)score,University of California-LOS Angeles(UCLA)Integrated Staging System(UISS),and Leibovich Prognosis Score(LPS).

关键词： Renal cell carcinoma Inflammation Prognosis Biomarker

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脑内出血后的远期死亡率

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世界核心医学期刊文摘（神经病学分册） 2006年第9期2卷 15-16页

作者： Flaherty M. L. Haverbusch M. sekar P. 张慧(译) University of Cincinnati Medical Center MSB 231 Albert Sabin Way Cincinnati OH 45267-0525 United States 不详

Objective: To characterize long-term mortality following intracerebral hemorrhage (ICH) in two large population-based cohorts assembled more than a decade apart. Methods: All patients age ≥18 hospitalized with nontraumatic ICH in the Greater Cincinnati/Northern Kentucky area were identified during 1988 (Cohort 1) and from May 1998 to July 2001 and August 2002 to April 2003 (Cohort 2). Mortality was tabulated using actuarial methods and compared with a log-rank test. Results: There were 183 patients with ICH in Cohort 1 and 1,041 patients in Cohort 2. Patients in Cohort 1 were more likely to be white (p = 0.024) and undergo operation for their ICH (p = 0.002), whereas patients in Cohort 2 were more commonly on anticoagulants (p < 0.001). Among patients in Cohort 1, mortality at 7 days, 1 year, and 10 years was 31, 59, and 82%. Among patients in Cohort 2, mortality at 7 days and 1 year was 34 and 53%. Mortality rates did not differ between cohorts by logrank test (p = 0.259). Conclusions: Intracerebral hemorrhage (ICH) mortality did not improve significantly between study periods. Operation for ICH became less frequent, whereas anticoagulant-associated ICH became more common.

关键词：远期死亡率脑内出血手术治疗时序检验资料收集非外伤性检验结果 ICH

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探索BS25999国际性营运持续管理标准(BCM)

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电器 2008年第3期 36-36页

作者： JC sekar Frederick Sy Henry Ee

BS25999-2007是英国标准协会（BSI）所提出的国际性营运持续管理规范标准，其前身是2006年发布的BS25999-1。企业在营运活动中断后的复原能力已被公认为营运策略的重要一环，因此，许多企业希望了解新的营运持续管理标准BS25999-2007及... 详细信息

BS25999-2007是英国标准协会（BSI）所提出的国际性营运持续管理规范标准，其前身是2006年发布的BS25999-1。企业在营运活动中断后的复原能力已被公认为营运策略的重要一环，因此，许多企业希望了解新的营运持续管理标准BS25999-2007及该标准所界定的BCM（业务持续管理管理）流程。本文根据已发布的文件草案，列出相关信息，以协助读者更快地掌握该标准的精髓。

关键词：持续管理规范标准国际性营运英国标准协会相关信息 BCM 企业

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