60 research outputs found
Emeline Renz, CSCJ Supplemental Assignments, Spring 2020
No full textCSCJ Supplemental Assignments, Spring 2020. Submitted by Emeline Renz, GIS Coordinator, Sociology and Criminal Justice Department, Clark Atlanta University
Emeline Renz, Clark Atlanta University, April 20, 2020
No full textStatement submitted by Emeline Renz, GIS Coordinator (Faculty/Staff), Sociology and Criminal Justice Department, Clark Atlanta University
Cobalt- and rhodium-corrole-triphenylphosphine complexes revisited: the question of a noninnocent corrole
No full textA reinvestigation of cobalt-corrole-triphenylphosphine complexes has yielded an unexpectedly subtle picture of their electronic structures. UV-vis absorption spectroscopy, skeletal bond length alternations observed in X-ray structures, and broken-symmetry DFT (B3LYP) calculations suggest partial CoII-corrole•2- character for these complexes. The same probes applied to the analogous rhodium corroles evince no evidence of a noninnocent corrole. X-ray absorption spectroscopic studies showed that the Co K rising edge of Co[TPC](PPh3) (TPC = triphenylcorrole) is red-shifted by ∼1.8 eV relative to the bona fide Co(III) complexes Co[TPC](py)2 and Co[TPP](py)Cl (TPP = tetraphenylporphyrin, py = pyridine), consistent with a partial CoII-corrole•2- description for Co[TPC](PPh3). Electrochemical measurements have shown that both the Co and Rh complexes undergo two reversible oxidations and one to two irreversible reductions. In particular, the first reduction of the Rh corroles occurs at significantly more negative potentials than that of the Co corroles, reflecting significantly higher stability of the Rh(III) state relative to Co(III). Together, the results presented herein suggest that cobalt-corrole-triphenylphosphine complexes are significantly noninnocent with moderate CoII-corrole•2- character, underscoring - yet again - the ubiquity of ligand noninnocence among first-row transition metal corroles.</p
New experimental methods for the characterization of diffusion processes in battery electrode materials with high spatial resolution based on atomic force microscopy
No full textBatteriebasierte Energiespeicher – darunter insbesondere die Lithiumionenbatterie – stellen eine Schlüsseltechnologie zur erfolgreichen Bewältigung der Energiewende dar. Moderne Lithiumionenbatterien sind hochkomplexe, partikulär aufgebaute Systeme, deren Materialdesign ein tiefgehendes Verständnis der involvierten Transportprozesse erfordert. Bisher mangelt es an Analytikmethoden zur Untersuchung dieser Transportprozessen mit räumlicher Hochauflösung, um einzelne, nanoskopisch kleine Bestandteile einer Batterie zu charakterisieren und somit mögliche Schwachstellen exakt identifizieren zu können. In der vorliegenden Arbeit soll ein Beitrag zur Schließung dieser Lücke aufgezeigt werden. Es werden zwei neuartige Methoden zur nanoskaligen Analytik an Batteriematerialien entwickelt und vorgestellt. Beide Methoden basieren auf dem Einsatz der Rasterkraftmikroskopie. Der Fokus der Untersuchungen liegt dabei insbesondere auf der räumlich hochaufgelösten Quantifizierung der ambipolaren Diffusion in Batterie-Elektrodenmaterialien, welche einen fundamental wichtigen Transportprozess in Lithiumionenbatterien darstellt.Battery-based energy storage systems - including the lithium ion battery in particular - represent a key technology for successfully mastering the energy transition. Modern lithium ion batteries are highly complex, particulate systems whose material design requires an in-depth understanding of the transport processes involed. Until now, there has been a lack of analytical methods to investigate transport processes with high spatial resolution in order to characterize individual, nanoscopically small components of a battery and thus accurately identify potential bottlenecks. In the present work, a contribution to fill this gap is demonstrated. Two novel methods for nanoscale analysis on battery materials are developed and presented. Both methods are based on the atomic force microscopy. The focus of the investigations is in particular on the spatially high-resolution quantification of ambipolar diffusion in battery electrode materials, which is a fundamentally important transport process in lithium ion batteries
Studies in the subtribe Habenariinae (Orchidaceae). IV. Habenaria, Peristylus, and Cynorkis from the Fiji Islands
No full textThe following seven Habenaria species have been reported from the Fiji Islands: H. aliformis C. Schweinf., H. cynosorchidacea C. Schweinf., H. maculifera C. Schweinf., H. scrotiformis L.O. Williams, H. superflua Reichb. f., H. supervacanea Reichb. f. and H. tradescantifolia Reichb. f. A critical study has demonstrated that only two of this list – H. superflua and H. supervacanea — show the essential characters of the genus. The following three – namely H. aliformis, H. maculifera and H. scrotiformis – have to be transferred to Peristylus. It is noteworthy that among the subtribe Habenariinae the genus Peristylus is dominating in the Polynesian region.
The situation of H. tradescantifolia Reichb. f. is somewhat confused: the type quoted by the author (‘ Seemann no. 608, ex parte’) does not correspond with the published description. From this inhomogeneous entity, the component deviating from Reichenbach‘s diagnosis has been separated by Schlechter as H. cyrtostigma, which is, according to our findings, conspecific with Peristylus papuanus (Krzl.) J.J. Smith from New Guinea. No authentic specimen has been found in herbaria matching H. tradescantifolia Reichb. f., s.str. (in conformity with the description); the nature of this taxon remains therefore obscure.
Finally H. cynosorchidacea turned out to be identical with Cynorkis fastigiata Thou, from the Mascarenes. The disjunct dispersal of this plant is discussed.
According to our present knowledge the following members of the Habenariinae can be recognized for the Flora of Fiji: Habenaria superflua Reichb. f., H. supervacanea Reichb. f., Peristylus aliformis (C. Schweinf.) Renz & Vodonaivalu, P. maculiferus (C. Schweinf.) Renz & Vodonaivalu, P. papuanus (Krzl.) J.J. Smith, P. scrotiformis (L.O. Williams) Renz & Vodonaivalu, and Cynorkis fastigiata Thou
Design
No full textIn this chapter, a CBIR design based on previous work of the author (Pein, 2008) is presented. The available system already allows for a retrieval by a query string (Pein, Lu, & Renz, 2008a). In the context of this investigation, the system has been extended to support alternative user interfaces as well as a testing module used in the case studies below. Being a pure research prototype, the retrieval engine is optimized for generating accurate results in order to have a reliable data foundation. Further, the query language syntax and the constraints for a practical application of the learning algorithm are presented.AlternativeReviewe
Review Dying A Transition by Monika Renz Prabuddha Bharata December 2018
No full textThe very thought of death brings to mind fear and the prospect of facing something unknown. The average person is seldom prepared for death. Encountering death is the worst nightmare for most, only this is the last nightmare. We have funny notions about death. We feel it is alright if a person dies at an advanced age, particularly if without any long-term illness. We call this a ‘good’ death. Deaths after prolonged illnesses or at a young age in tragic circumstances like accidents or suicides are considered ‘bad’ deaths. We associate goodness with less suffering. With the knowledge of impending death, the idea of ego gets attenuated. We take less and less interest in possessing or performing. Our sense of worldly attachments weans away. This book first came into being in the form of a paper in a journal on palliative medicine. The original book in German has been translated as the present book. Monika Renz, the author, has a rich experience of attending to terminally ill patients, and giving them counselling and spiritual guidance
Determination of Lithium Diffusion Coefficients in Single Battery Active Material Particles by Using an AFM-Based Steady-State Diffusion Depolarization Technique
No full textSelf-Knowledge in Kierkegaard
No full textThroughout his authorship, Kierkegaard shows an intense fascination with Socrates and Socratic self-knowledge. This chapter traces, in roughly chronological order: (1) the young Kierkegaard’s autobiographical reflections on self-knowledge, when first coming to understand his task as an author; (2) Socrates as a negative figure in The Concept of Irony - where self-knowledge is understood in terms of separation from others and the surrounding society - and the contrast with the Concluding Unscientific Postscript’s treatment of Socrates as an exemplary “subjective thinker”; (3) in Either/Or, the connection between self-knowledge and self-transparency, and the link between self-knowledge and “choosing oneself”, understood as willing receptivity; (4) in writings such as The Concept of Anxiety and The Sickness Unto Death, the importance of sin and our utter dependence upon God for the question of whether self-knowledge is ever really possible; and (5) in Judge for Yourself! and related journal entries, a more precise specification of what Christian self-knowledge might amount to. I aim to show that, in his account of self-knowledge as much as elsewhere, treatments of Kierkegaard as a proto-existentialist risk misleadingly downplaying the deeply and explicitly Christian nature of his thought
What Spending Clause? (Or the President\u27s Paramour): An Examination of the Views of Hamilton, Madison, and Story on Article I, Section 8, Clause 1 of the United States Constitution
No full textThis article tests three interpretations of the General Welfare Clause that persisted prior to the U.S. v. Butler decision against the text of the Constitution and discusses historical conditions that add to the understanding of that clause of the U.S. Constitution. Specifically, the author examines: the strong Hamiltonian interpretation, the Madison interpretation, and the weak Hamiltonian or Story interpretation. The author concludes that in the course of testing each hypothesis, a surprising conclusion was reached: all interpretations failed to survive
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