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Search Results: 1 - 10 of 1499 matches for " Marius Schwerg "
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Renal Denervation Therapy: Indications and Success Factors
Karl Stangl,Verena Stangl,Marius Schwerg,Julia Searle,Martin M?ckel
Conference Papers in Science , 2013, DOI: 10.1155/2013/804764
Abstract: Arterial hypertension is a common and an increasing health care problem. In Germany and other Western countries, prevalence rates are as high as 50%. Of these, 13% of patients suffer from refractory hypertension, where the target blood pressure is not achievable with >3 antihypertensive substances. Renal denervation therapy (RDT) is a relatively new, catheterization-based intervention to treat patients with refractory hypertension. The rationale of RDT is the mechanical destruction with high frequency ablation of renal sympathetic fibers, which can be easily accessed via the renal artery. The first clinical trials evaluating effect and safety of the procedure have been promising, and RDT is being routinely used in specialized centers. 1. Introduction Arterial hypertension is one of the most important and prevalent risk factors for cardiovascular diseases. In Germany and other Western industrialized countries, a double-digit million number of patients suffer from arterial hypertension. Unfortunately, in the past, perception of arterial hypertension as a major risk factor was poor, as expressed in citations by John Hay: “The greatest danger to a man with high blood pressure lies in its discovery, because then some fool is certain to try and reduce it” [1] and Paul D White in 1931: “The treatment of the hypertension itself is a difficult and almost hopeless task … we know the hypertension may be an important compensatory mechanism” (Paul D White. Heart Disease (1st edn.) McMillan, New York (1931)). This perception was of political relevance: US President Franklin Delano Roosevelt died “unexpecteditly” at the end of World War II from a hemorrhagic stroke caused by exorbitantly increased arterial blood pressure as recorded by his personal physician during the Yalta Conference. Since then, the attitude towards arterial hypertension has changed. Today, we know that the blood pressure significantly correlates with the incidence of cardiovascular events; reduction of only 20 and 10?mmHg in systolic and diastolic blood pressure, respectively, results in an almost 50% decrease of death caused by cardiovascular events, independent of the patient’s age [2]. Today, cut-off values for a detailed definition of hypertension are available. Gold standard is the 24-hour blood pressure measurement, which should not exceed 125–130/80?mmHg. Most clinical trials use the office blood pressure, where the threshold is set at 140/90?mmHg. Cut-off values for day, night, and home measurement have also been defined [3]. Using these cut-offs, the prevalence of arterial hypertension in
Symbolical Analysis of RF-Network Problems using Mason’s Rule
N. Schwerg
Radioengineering , 2012,
Abstract: We briefly review Mason’s rule for the computation of RF-network problems and show its implementation into the software package freeMASON. This tool solves symbolically Mason’s rule for any wave quantity and allows to derive analytical expressions as well as their functional evaluation. We demonstrate our approach studying the effect of an unbalanced magictee on the RF power distribution to two accelerating cavities.
Exploring the Nature of Information Systems Development Methodology: A Synthesized View Based on a Literature Review  [PDF]
Daniela Mihailescu, Marius Mihailescu
Journal of Service Science and Management (JSSM) , 2010, DOI: 10.4236/jssm.2010.32033
Abstract: New Information Systems Development Methodologies (ISDMs) are suggested in the belief that their deployment would be beneficial to consultants in their work. A large number of ISDMs already exist but their value has been questioned and at the same time new methodologies continue to be introduced in an attempt to support and improve the practice of information systems development work. What is not always clear from current studies is that ISDM is a multi-perspective and cross-discipline phenomenon. Although a large amount of knowledge of ISDM is available, different disciplinary interests have resulted in fragmented assessments of it. This paper intends to identify theoretical perspectives applied in the conceptualization of ISDM. A review of the literature on ISDM was conducted and four different theoretical perspectives were identified: 1) system, 2) structure, 3) innovation, and 4) knowledge. While each perspective provides various overarching depictions of ISDM, the synthesized view of ISDM provided in this study reveals the complexities and ambiguities of a multifaceted phenomenon such as ISDM. Suggestions for an alternative conceptualization of ISDM are provided in an attempt to facilitate the investigation of ISDM.
Quantum Tic-Tac-Toe: A Genuine Probabilistic Approach  [PDF]
Marius Nagy, Naya Nagy
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.331243
Abstract: We propose a quantum version of Tic-Tac-Toe which accurately reflects the inherent probabilistic nature of the measurement principle in quantum mechanics. We then formulate a quantum strategy which allows a quantum player to consistently win over a classical player, with a certain probability. This result can be seen as another proof of the superior computational power of a quantum system with respect to a classical one. Our investigation also reveals that the non-determinism and complexity introduced by the principles of quantum mechanics into even the most simple games make brute-force strategies considerably more difficult to implement. Consequently, games in which machines have gained the upper hand over humans may be made fair again by upgrading them to a quantum level.
On a Discrete Version of the Mohr-Mascheroni Theorem  [PDF]
Marius Munteanu, Laura Munteanu
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.411A4002
Abstract:

We introduce a new geometric tool called n-compass and show that the famous theorem of Mascheroni and Mohr remains valid if the traditional compass is replaced by the newly introduced tool.

Rational Equiangular Polygons  [PDF]
Marius Munteanu, Laura Munteanu
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.410197
Abstract:

The main purpose of this note is to investigate equiangular polygons with rational edges. When the number of edges is the power of a prime, we determine simple, necessary and sufficient conditions for the existence of such polygons. As special cases of our investigations, we settle two conjectures involving arithmetic polygons.

Local exact controllability of the diffusion equation in one dimension
Marius Beceanu
Abstract and Applied Analysis , 2003, DOI: 10.1155/s1085337503303033
Abstract: This paper establishes the local exact null controllability of the diffusion equation in one dimension using distributed controls in the case of the Dirichlet boundary value problem. Most of the techniques used in the course of the proof are borrowed from Barbu (2002).
Dani l 2 as satire
Marius Nel
HTS Theological Studies/Teologiese Studies , 2012,
Abstract: Daniel 2 as satire. Readers use intuitive and acquired knowledge about genres in interpreting what they read and hear, underlining the importance of establishing the genre of a specific piece of literature. The genre of the tales in the Book of Daniel (1–6) has been researched over a long period, without leading to a consensus. In this article it is suggested that the genre of the tales in Daniel may be described in terms of satire, used as a means of resistance to foreign political oppression. Especially humor and irony are utilised in the satire to describe Jewish perception of the oppression and oppressor, and to make suggestions for acting in the crisis situation of Antiochus’ suppression of the Jewish religion. This is demonstrated in terms of the tale in Daniel 2, and specifically in the depiction of the indirect characters in the tale – the God of the Jews in Daniel 2, in contrast to the powerlessness of the gods of the mighty heathen king. In this way the true nature of Jewish oppression is pictured in a humorous way when the Babylonian gods are at the mercy of the Jewish God. HTS Teologiese Studies/Theological Studies, 68(1), 2012
“Note on sex for the aged widower”: On André Brink's The Rights of Desire
Marius Crous
Tydskrif vir letterkunde , 2006,
Abstract: This article examines the representation of masculinity in André Brink's novel, The Rights of Desire. Following a remark in Roger Boylan's review of the novel in the Boston Review; this analysis concentrates on Brink's depiction of Afrikaner masculinity and the idea that the character Ruben Olivier represents Brink's conception of the contemporary Afrikaner male, in particular the older Afrikaner male. This is an attempt at determining the validity of Robert Morrell's thesis on masculinity, namely that it is about “men making and remaking masculinity, about challenging hegemonic masculinity and reconstituting it.” The question is whether Brink's portrayal of Afrikaner masculinity confronts the hegemonic and patriarchal power structures associated with Afrikaner men, and whether it provides the reader with a new perspective on Afrikaner masculinity. This article investigates Brink's representation of firstly, the ways Afrikaner men relate to other men, and secondly, the depiction of Afrikaner men in relation to their social class and to women.
PRINCIPLE OF PROPORTIONALITY, CRITERION OF LEGITIMACY IN THE PUBLIC LAW
Marius ANDREESCU
Lex et Scientia , 2011,
Abstract: A problem of essence of the state is the one to delimit the discretionary power, respectively the power abuse in the activity of the state’s institutions. The legal behavior of the state’s institutions consists in their right to appreciate them and the power excess generates the violation of a subjective right or of the right that is of legitimate interest to the citizen. The application and nonobservance of the principle of lawfulness in the activities of the state is a complex problem because the exercise of the state’s functions assumes the discretionary powers with which the states authorities are invested, or otherwise said the ‘right of appreciation” of the authorities regarding the moment of adopting the contents of the measures proposed. The discretionary power cannot be opposed to the principle of lawfulness, as a dimension of the state de jure. In this study we propose to analyze the concept of discretionary power, respectively the power excess, having as a guidance the legislation, jurisprudence and doctrine in the matter. At the same time we would like to identify the most important criterions that will allow the user, regardless that he is or not an administrator, a public clerk or a judge, to delimit the legal behavior of the state’s institutions from the power excess. Within this context, we appreciate that the principle of proportionality represents such a criterion. The proportionality is a legal principle of the law, but at the same time it is a principle of the constitutional law and of other law branches. It expresses clearly the idea of balance, reasonability but also of adjusting the measures ordered by the state’s authorities to the situation in fact, respectively to the purpose for which they have been conceived. In our study we choose theoretical and jurisprudence arguments according to which the principle of proportionality can procedurally be determined and used to delimit the discretionary power and power abuse.
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