cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Verbesserung der EMV mittels verlustbehafteter Bauelemente und Strukturen
Creators: name: Hampe, Matthias
name: Tieste, Karl-Dieter
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Resonanz
subject: Grenzwert
subject: elektromagnetische Verträglichkeit
subject: Bauelement
subject: Leiterplatte
subject: Abblockkondensator
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: In der Praxis werden Grenzwerte der elektromagnetischen Verträglichkeit (EMV) häufig aufgrund unerwünschter Resonanzen nicht eingehalten. Tatsächlich können sogar Komponenten, die zur Verbesserung der EMV angebracht werden, die EMV verschlechtern - es kommt nicht selten vor, dass diese mit weiteren Bauteilen in Resonanz geraten. Das wohl wichtigste Beispiel ist in diesem Zusammenhang der Abblockkondensator. Anhand einer einfachen Schaltung wurde im Rahmen dieser Arbeit gezeigt, dass sich diese unerwünschten Resonanzen durch gezieltes Erhöhen der Verluste vollständig vermeiden oder zumindest verringern lassen. Hier lässt sich letztlich von elektrischen Tilgern sprechen, die in den vergangenen Jahren bereits bei einigen praxisrelevanten Beispielen erfolgreich verwendet wurden. In dieser Arbeit wurde insbesondere auf die Bedämpfung von Resonanzen auf Leiterplatten und Leitungen eingegangen. In der Praxis werden Grenzwerte der EMV häufig aufgrund unerwünschter Resonanzen nicht eingehalten. Tatsächlich können sogar Komponenten, die zur Verbesserung der EMV angebracht werden, die EMV verschlechtern - es kommt nicht selten vor, dass diese mit weiteren Bauteilen in Resonanz geraten. Das wohl wichtigste Beispiel ist in diesem Zusammenhang der Abblockkondensator. Anhand einer einfachen Schaltung wurde im Rahmen dieser Arbeit gezeigt, dass sich diese unerwünschten Resonanzen durch gezieltes Erhöhen der Verluste vollständig vermeiden oder zumindest verringern lassen. Hier lässt sich letztlich von elektrischen Tilgern sprechen, die in den vergangenen Jahren bereits bei einigen praxisrelevanten Beispielen erfolgreich verwendet wurden. In dieser Arbeit wurde insbesondere auf die Bedämpfung von Resonanzen auf Leiterplatten und Leitungen eingegangen.
Laser-heated pedestal growth of cerium doped calcium scandate crystal fibers
Creators: name: Philippen, J.
name: Guguschev, C.
name: Bertram, R.
name: Klimm, D.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Ce3+ doped oxide materials are promising for optical emission in the green spectral range. The growth of CaSc2O4:Ce3+ single crystals is reported here for the first time. Laser heated pedestal growth (LHPG) proved to be suitable for this refractive material, if performed in nitrogen of 99.999% purity. If the oxygen content of the growth atmosphere is substantially larger, Ce4+ is formed, which shows no useful optical emission. If the oxygen content is substantially lower, severe evaporation of calcium impedes stable crystal growth. Thermodynamic equilibrium calculations allowed to describe evaporation of species and cerium dopant charging under different growth conditions. The evaporation could be investigated by quadrupole mass spectrometry of emanating gases and by chemical analysis of fibers with ICP-OES. The congruent melting point was confirmed by DTA at 2110 degrees centigrade. Photoluminescence spectrometry of fibers revealed the dependence of optical emission in the green spectral range on growth conditions.
description: 20 pages, 9 figures, 3 tables, submitted to J. Crystal Growth
Potamogeton friesii Rupr.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: P.Friesii Rupr. (P.mucronatus Schrader) Nicht im Wallis. Ein von E. THOMAS in Outre-Rhöne (Distr. l) gesammeltes, von BENNETT als P. mucronatus bestimmtes Exemplar gehörtnach E.BAUMANN zu P.pusillus var.mucronulatus.
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
Bayesian Analysis of ARMA and BSTS models for COVID-19 data using R and Stan
Creators: name: T., Muhammed Navas
name: Athar Ali Khan
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: BSTS
COVID-19
ARIMA
MCMC
LOOIC
WAIC
Stan

description: This study compares the performance of Bayesian ARIMA and BSTS models for COVID-19 data using Bayesian approach. Many studies in the literature have compared the BSTS model and classical ARIMA models for infectious disease modelling, and the BSTS model performs well. Apart from the literature, this study is trying to prove the Bayesian ARIMA model gives a better result than the BSTS model. This study uses a different modelling and model comparison method to compare widely used autoregressive integrated moving average (ARIMA) models with their Bayesian structural time series (BSTS) models for COVID-19 data using the Bayesian approach. It is essential to find the order of the ARIMA model before doing bayesian analysis. We find the order of the ARIMA model using measurement LOO information criteria , using the Hamiltonian Montecarlo algorithm and rstan estimate the parameters of ARIMA and BSTS models for COVID-19 data. Furthermore, compare both models using Looic and Waic values; Bayesian ARIMA models outperform in this study.
The color dependent morphology of the post-AGB star HD161796
Creators: name: Min, M.
name: Jeffers, S. V.
name: Canovas, H.
name: Rodenhuis, M.
name: Keller, C. U.
name: Waters, L. B. F. M.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: Context. Many protoplanetary nebulae show strong asymmetries in their surrounding shell, pointing to asymmetries during the mass loss phase. Questions concerning the origin and the onset of deviations from spherical symmetry are important for our understanding of the evolution of these objects. Here we focus on the circumstellar shell of the post-AGB star HD 161796. Aims. We aim at detecting signatures of an aspherical outflow, as well as to derive the properties of it. Methods. We use the imaging polarimeter ExPo (the extreme polarimeter), a visitor instrument at the William Herschel Telescope, to accurately image the dust shell surrounding HD 161796 in various wavelength filters. Imaging polarimetry allows us to separate the faint, polarized, light from circumstellar material from the bright, unpolarized, light from the central star. Results. The shell around HD 161796 is highly aspherical. A clear signature of an equatorial density enhancement can be seen. This structure is optically thick at short wavelengths and changes its appearance to optically thin at longer wavelengths. In the classification of the two different appearances of planetary nebulae from HST images it changes from being classified as DUPLEX at short wavelengths to SOLE at longer wavelengths. This strengthens the interpretation that these two appearances are manifestations of the same physical structure. Furthermore, we find that the central star is hotter than often assumed and the relatively high observed reddening is due to circumstellar rather than interstellar extinction.
description: Accepted for publication in A&A
Element Abundances in Solar Energetic Particles and the Solar Corona
Creators: name: Reames, Donald V.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: This is a study of abundances of the elements He, C, N, O, Ne, Mg, Si, S, Ar, Ca, and Fe in solar energetic particles (SEPs) in the 2 - 15 MeV amu-1 region measured on the Wind spacecraft during 54 large SEP events occurring between November 1994 and June 2012. The origin of most of the temporal and spatial variations in abundances of the heavier elements lies in rigidity-dependent scattering during transport of the particles away from the site of acceleration at shock waves driven out from the Sun by coronal mass ejections (CMEs). Variation in the abundance of Fe is correlated with the Fe spectral index, as expected from scattering theory but not previously noted. Clustering of Fe abundances during the "reservoir" period, late in SEP events, is also newly reported. Transport-induced enhancements in one region are balanced by depletions in another, thus, averaging over these variations produces SEP abundances that are energy independent, confirms previous SEP abundances in this energy region, and provides a credible measure of element abundances in the solar corona. These SEP-determined coronal abundances differ from those in the solar photosphere by a well-known function that depends upon the first ionization potential (FIP) or ionization time of the element.
description: submitted to Solar Physics, 21 pages, 12 figures
Pseudo Hermitian Generalized Dirac Oscillators
Creators: name: Dutta, D.
name: Panella, O.
name: Roy, P.
Publisher: name: arXiv
Year: 2013
Subjects: subject: Mathematical Physics (math-ph)
subject: High Energy Physics - Theory (hep-th)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study generalized Dirac oscillators with complex interactions in $(1+1)$ dimensions. It is shown that for the choice of interactions considered here, the Dirac Hamiltonians are $η$ pseudo Hermitian with respect to certain metric operators $η$. Exact solutions of the generalized Dirac Oscillator for some choices of the interactions have also been obtained. It is also shown that generalized Dirac oscillators can be identified with Anti Jaynes Cummings type model and by spin flip it can also be identified with Jaynes Cummings type model.
description: To appear in Annals of Physics (Elsevier)
The Influence of Saccade Predictability on Feature Binding after an Eye Movement (Exp 1)
Creators: name: Golomb, Julie
name: Tzu-Yao Chiu
name: Jaen, Isabel
Publisher: name: OSF Registries
Year: 2023
Subjects: subject: Cognitive Psychology
subject: Cognition and Perception
subject: Social and Behavioral Sciences
subject: Psychology
subject: FOS: Psychology
subject: Eye Movement
subject: Feature-Binding
subject: Mixture Modeling
subject: Saccade

description: This study investigates whether and how saccade predictability influences feature binding after an eye movement.
A Probabilistic Algorithm for Reducing Broadcast Redundancy in Ad Hoc Wireless Networks
Creators: name: Islam, Md. Nazrul
name: Hashem, M. M. A.
name: Rahman, A. M. Moshiur
Publisher: name: arXiv
Year: 2013
Subjects: subject: Networking and Internet Architecture (cs.NI)
subject: Data Structures and Algorithms (cs.DS)
subject: FOS: Computer and information sciences

description: In a wired network, a packet can be transmitted to a specified destination only, no broadcasting required. But in ad hoc wireless network a packet transmitted by a node can reach all neighbors due to broadcasting. This broadcasting introduces unnecessary retransmissions of same message. Therefore, the total number of transmissions (forward nodes) is generally used as the cost criterion for broadcasting. The problem of finding the minimum number of forward nodes is NP-complete. In this paper, the goal is to reduce the number of forward nodes which will reduce redundant transmission as a result. Thus some of approximation approaches are analyzed, especially dominant pruning and total dominant pruning which use 2-hop neighborhood information and a new approach: Probability based algorithm is proposed with a view to minimizing number of forward nodes. Simulation results of applying this algorithm shows performance improvements with compared to dominant pruning and total dominant pruning algorithms.
POPULATION STATUS OF TIGERS (PANTHERA TIGRIS) IN A PRIMARY RAINFOREST OF PENINSULAR MALAYSIA
Creators: name: Kawanishi, Kae
Publisher: name: Zenodo
Year: 2002
Subjects: Biodiversity
Mammalia
Chiroptera
Chordata
Animalia
bats
bat

description: (Uploaded by Plazi for the Bat Literature Project) No abstract provided.
Niederfrequente magnetische Störfelder: Beispiele, Messung, Maßnahmen
Creators: name: Hiebel, Stefan
name: Filistovich, Denis
name: Kühn, Michael
name: Weber, Thomas
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Störsignal
subject: magnetische Abschirmung
subject: niederfrequent
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Bei magnetischen Abschirmungen geht es entweder darum, empfindliche Geräte oder auch Personen vor niederfrequenten Magnetfeldern zu schützen (Abschirmung der Störsenke), oder die durch technische Geräte entstehenden Magnetfelder an ihrer Ausstreuung nach außen zu hindern (Abschirmung der Störquelle). „Niederfrequent“ bezeichnet in diesem Zusammenhang typischerweise den Frequenzbereich von 0 bis zu einigen kHz. Zumeist ist eine Abschirmung der Störsenke vorzuziehen, da die dort auftretenden Störfelder bereits durch den Abstand zur Störquelle reduziert sind. Zudem sind senkennahe Abschirmungen oft kleiner ausführbar und mit sinkender Größe einer magnetischen Abschirmung steigt ihre Wirksamkeit und ihre Empfindlichkeit gegen magnetische Sättigung des Abschirmmaterials sinkt. Häufig anzutreffende Situationen, die magnetische Abschirmmaßnahmen erfordern, sind z. B. wissenschaftliche Versuchsaufbauten, medizintechnische Geräte, empfindliche elektronische Komponenten in Maschinen, Fahr- und Flugzeugen, aber auch der Aufenthaltsbereich von Personen in der näheren Umgebung technischer Anlagen, insbesondere dort, wo große elektrische Ströme fließen.
BAYESIAN AND CLASSICAL ESTIMATIONS OF TRANSMUTED INVERSE GOMPERTZ DISTRIBUTION
Creators: name: T.M. Adegoke
name: K.O. Obisesan
name: O.M. Oladoja
name: G.K. Adegoke
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: Classical method
Bayesian method
Posterior distribution
Loss functions
Transmuted inverse Gompertz distribution

description: In this article, the use of the transmuted inverse Gompertz distribution in modeling lifetime data is investigated particularly in cases where standard probability distributions are not able to properly handle complex datasets. The quadratic rank transmutation map scheme is utilized to obtain the distribution. The study explores several characteristics of the transmuted inverse Gompertz model, including the estimation of parameters through classical approaches such as maximum likelihood estimation, least-squares estimation, Crammér-Von Misses estimation, and maximum product spacing estimation. Additionally, the Bayesian techniques is used under different loss functions, such as the Linex loss function, square error loss function, and general entropy loss function. The estimates obtained from both classical and Bayesian techniques are evaluated using simulation. To illustrate the potential benefits of the transmuted inverse Gompertz model, a dataset on the strength of aircraft window glass is employed. The results obtained from the application of the new distribution to the real-life dataset demonstrate that it yields superior fits in comparison to other well-known distributions. The study’s findings suggest that the transmuted inverse Gompertz model can provide a useful alternative for modeling lifetime data. The research offers valuable insights into the distribution’s properties and estimation techniques, as well as its superiority over other commonly used distributions. The new model can contribute to the development of more accurate and efficient models for analyzing lifetime dataset. Overall, the study highlights the importance of exploring new statistical models and techniques to improve data analysis and decision-making.
BAYESIAN INTERVAL ESTIMATION FOR THE PARAMETERS OF POISSON TYPE LENGTH BIASED EXPONENTIAL CLASS MODEL
Creators: name: Singh, Rajesh
name: Badge, Preeti A.
name: Pritee Singh
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: Length biased exponential distribution
Non informative priors
Software reliability growth model (SRGM)
Bayesian interval
average length
coverage probability

description: In this research paper, two sided Bayesian interval is proposed for Poisson type length biased exponential class software reliability growth model. The failure intensity function, mean time to failure function and likelihood function are derived. Bayesian interval estimation has been done for the parameters using non informative priors. The performance of proposed Bayesian interval is obtained by using Monte Carlo simulation technique. Average length and coverage probability of Bayesian interval for the parameters are calculated. From the obtained intervals it is concluded that Bayesian interval of parameters perform better for appropriate choice of execution time and certain values of parameters.
title: Erstickungsgefahr durch kleine Hartzucker-Bälle
Creators: name: Bundesinstitut Für Risikobewertung
Publisher: name: Bundesbehörden und Einrichtungen im Geschäftsbereich des Bundesministeriums für Ernährung und Landwirtschaft (BMEL)
Year: 2017
Subjects: subject: 000

description: BfR-Stellungnahmen, vol. 2017, no. 025, p. 9
SDMS-based Disk Encryption Method
Creators: name: An, Dokjun
name: Ri, Myongchol
name: Choe, Changil
name: Han, Sunam
name: Kim, Yongmin
Publisher: name: arXiv
Year: 2012
Subjects: subject: Cryptography and Security (cs.CR)
subject: FOS: Computer and information sciences

description: We propose a disk encryption method, called secure disk mixed system (SDMS) in this paper, for data protection of disk storages such as USB flash memory, USB hard disk and CD/DVD. It is aimed to solve temporal and spatial limitation problems of existing disk encryption methods and to control security performance flexibly according to the security requirement of system. SDMS stores data by encrypting with different encryption key per sector and updates sector encryption keys each time data is written. Security performance of SDMS is analyzed at the end of the paper.
Shear Transfer of Load From Main Beams to Intermediate Corrugations in Metal Sheet Covered Box Beams
Creators: name: Mellinger, George Rolland
name: Kurihara, Hisayuki
Publisher: name: California Institute of Technology
Year: 1938
Subjects: Aeronautics
Aeronautical Engineering

description: NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document.

A program of experimental investigation for three combinations of sheet reinforced with corrugations has been carried out.

An assumption has been made for the transverse neutral axis of such a system.

For an open section box beam, the conventional assumption of the neutral axis on the center of gravity plane indicates an error.

An attempt has been made to calculate the compressive stress in each corrugation due to shear transfer of load.

An effective shear modulus for each corrugation and its share of the skin under bending loads has been found by experimental methods.

For the combinations tested, it was found that the effective shear modulus, G/E, decreases with increasing τ, which corresponds to increasing G/E with distance from the free end of the panel.

Panel curvature was found to have a marked effect on G/E, in that the curved panel had a larger value of G/E for the same τ.

Contour maps of τ, the shearing stress, have been constructed for the three panels.
Combined Redundancy Optimization for a System Comprising Operative, Cold Standby and Warm Standby Units
Creators: name: Lalji Munda
name: Taneja, Gulshan
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: Cold Standby
Profit Analysis
Redundancy
Warm Standby

description: The company or industry can increase system reliability and provide stress-free operation by adding redundant equivalent subsystems to the active unit. The warm standby system is accessible if the operational unit malfunctions, and the cold standby system can take over. This paper aims to analyze a system comprised of one operative unit, cold standby unit, and one warm standby unit. Cold standby is activated to become warm standby when the operative unit fails, and warm standby becomes operational immediately. A minor defect causes the warm standby unit to fail, whereas a major fault causes the operational unit to fail. Such systems are used by many businesses, sectors, and facilities to prevent operational and reputational losses. Cut-off values for the failure rate, activation rate, revenue cost, and cost per repairman visit have been calculated to determine when the system is profitable. Various system performance measures have been defined by using the Markov process and regeneration point method.
Subjective Theories about ET
Creators: name: Döbler, Niklas A.
name: Raab, Marius
name: Carbon, Claus-Christian
Publisher: name: Zenodo
Year: 2023
Subjects: Exopsychology
Subjective theories
extraterrestrials
seti

description: Humans act according to theories. Noteworthy, theories are not only a matter of science. Instead, they structure and permeate virtually every aspect of human life. The Heidelberg Structure-Formation Technique is a qualitative method to visualize so-called subjective theories. It is not limited to a particular area. This technique was, for instance, adapted to gain insights into the needs of palliative care patients or engagement with alternative health measures. The inner logic is that subjective theories guide everyday action and comprise structured and relational beliefs and states of knowledge. Semi-structured interviews are followed by a cooperative theory visualization to clarify these theories. Based on the interview, expert rates try to identify the structure of a subjective theory which is then mirrored to the participant. The participant is now asked to comment and correct this proposal, leading to a harmonized version of the theory proposal. To aid this process, the specific parts of the theories are written down and arranged on paper cards. The result is the theory, expressed with a set of spatially ordered cards that reveal key concepts and underlying relationships. This talk reports findings on subjective theories about extraterrestrial intelligence. Theories of three laypeople reveal patterns of thinking, best described as a mixture of inadmissible and admissible anthropocentrism. Theories were somewhat complex and seriously contemplated the possibility of intelligent life beyond Earth. These findings provide a novel and in-depth perspective into how humans think about extraterrestrials. As the function of these theories is the guidance of action, they can be used to predict human reactions to first contact. Furthermore, they can be used to increase better attune science communication and address potential misconceptions.
DESIGNING OF ACCEPTANCE SAMPLING PLAN BASED ON PERCENTILES FOR TOPP-LEONE GOMPERTZ DISTRIBUTION
Creators: name: S. Jayalakshmi
name: Aleesha, A.
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: Acceptance sampling plan
Percentiles
Topp-Leone Gompertz (TL-G) distribution
Operating characteristic values
Producer‘s risk
Minimum sample size

description: Acceptance sampling is a statistical technique used to inspect the quality of a batch of products. An acceptance sampling plan under which sampling inspection is performed by conducting life test upon the sampled products is termed as reliability sampling plan. In this paper, a single acceptance sampling plan based on percentile is presented for Topp-Leone Gompertz (TL-G) distribution when the life test is truncated at a pre-specified time. The minimum sample size necessary to ensure the specified life percentile is obtained under a given consumer‘s risk. The operating characteristic values (and curves) of the sampling plans as well as the producer’s risk are presented.
Bestimmung der Exposition der Bevölkerung durch LTE- und TETRA BOS-Mobilfunkanlagen
Creators: name: Bornkessel, Christian
name: Schubert Markus
name: Wuschek, Matthias
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Immission
subject: Messpunkt
subject: Strahlenschutz
subject: Basisstation
subject: Grenzwert
subject: Mobilfunk
subject: Bevölkerung
subject: Funkanlage
subject: Feldstärke
subject: Sendeanlage
subject: Messtechnik
subject: LTE (Long-Term-Evolution)
subject: Mobilfunktechnik
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Der Beitrag fasst die Ergebnisse eines Forschungsprojektes für das Bundesamt für Strahlenschutz zur messtechnischen Analyse von Immissionen im Umfeld von Long Term Evolution (LTE-) und TETRA BOS-Basisstationen zusammen. LTE-Messungen an 102 systematisch und 75 zufällig ausgewählten Messpunkten ergaben auf maximale Anlagenauslastung extrapolierte Immissionen zwischen 0,002 und 7,28 % der Feldstärkegrenzwerte der 26. BImSchV (Median 0,70 %). Die TETRA BOSMessungen an 40 systematisch und 40 zufällig ausgewählten Messpunkten ergaben extrapolierte Immissionen zwischen 0,03 und 4,63 % des Feldstärkegrenzwertes (Median 0,46 %). LTE- und TETRA BOS-Immissionen sind von ihrer Größenordnung und ihrer örtlichen Verteilung vergleichbar zu den Immissionen durch GSM- und UMTSMobilfunkanlagen. Als Fazit lässt sich feststellen, dass mit den Basisstationen der neuen Mobilfunktechniken LTE und TETRA BOS eine Immissionszunahme für die Bevölkerung verbunden ist; die Gesamtimmission durch Sendeanlagen bewegt sich aber nach wie vor auf sehr geringem Niveau (Median kleiner als 2 % des Feldstärkegrenzwertes). An den untersuchten Mobilfunkanlagen ergab sich bei maximaler Anlagenauslastung im Mittel ein leistungsbezogener Zuwachs der Mobilfunkimmissionen von 37 % durch LTE bzw. 47 % durch TETRA BOS. Die Projektergebnisse sind im Detail unter [Bestimmung der Exposition der allgemeinen Bevölkerung durch neue Mobilfunktechniken. Studie im Auftrag des Bundesamtes für Strahlenschutz; http://www.emf-forschungsprogramm.de/akt_emf_forschung.html/dosi_HF_004.html] dokumentiert.
Ermittlung und Vergleich der elektromagnetischen Eigenschaften von Volumenleitern mittels analytischer und numerischer Verfahren
Creators: name: Wang, Xiaowei
name: Tkachenko, Sergey
name: Vick, Ralf
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Streuungskoeffizient
subject: numerische Simulation
subject: analytisches Verfahren
subject: Berechnungsverfahren
subject: Methode der kleinsten Quadrate
subject: Leitungstheorie
subject: Integralgleichung
subject: ebene Welle
subject: Rechenzeit
subject: Speicheranforderung
subject: Volumenleiter
subject: Problemstellung
subject: Leitungslänge
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: In diesem Beitrag wurde ein neues Verfahren zur Berechnung des eingekoppelten Stromes in einen Volumenleiter vorgestellt, das auf der asymptotischen Annäherungsmethode und der Methode der kleinsten Quadrate beruht. Als Anregung wurde eine ebene Welle angenommen. Um solche Problemstellungen zu untersuchen, existierte bisher nur eine verallgemeinerte Leitungstheorie mit modalen Parametern oder die Möglichkeit der numerischen Simulation. Der Vorteil der vorgestellten asymptotischen Annäherungsmethode ist offensichtlich, da die Streuungskoeffizienten unabhängig von der Leitungslänge sind. Daher ist es relativ einfach, die Berechnung der Streuungskoeffizienten für eine relativ lange Leitung, basierend auf den Ergebnissen von kurzen Leitungen, durchzuführen. Die beschreibende Integralgleichung mit gemischten Potentialen braucht nur über eine verminderte Konfiguration gelöst werden, wodurch man eine kurze Rechenzeit und kleine Speicheranforderungen erzielt [Farhad Rachidi, Sergey Tkachenko: EM Field Interaction with TL - From Classical Theory to HF Radiation Effects, Kapitel 4 und 5 (WIT Press 2008)].
Anwendung der Leitungssupertheorie auf verdrillte Leitungen
Creators: name: Magdowski, Mathias
name: Vick, Ralf
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Verdrillung
subject: Leitungstheorie
subject: Randbedingung
subject: Signalübertragung
subject: Verdrehwinkel
subject: elektrische Feldstärke
subject: magnetische Feldstärke
subject: Wellenvektor
subject: Frequenzbereich
subject: Informationstechnik
subject: Ladungsdichte
subject: Kreisfrequenz
subject: Vektorpotenzial
subject: Leitungsparameter
subject: Abstrahlungsverlust
subject: Leitungsgleichung
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Am Beispiel einer verdrillten Doppelleitung wurde die grundlegende Vorgehensweise der Leitungssupertheorie dargestellt. Die erhaltenen Leitungsparameter sind ortsabhängig und ändern sich entlang der Leitung entsprechend der Verdrillung. Die Lösung der Leitungsgleichungen erfolgt mit Hilfe des Matrixexponentials unter Einbeziehung von bestimmten Randbedingungen. Um das gesamte Konzept der Leitungssupertheorie umzusetzen, muss die retardierte Greensche Funktion benutzt werden, die zu komplexwertigen Leitungsparametern führt, welche die Abstrahlungsverluste der Leitung charakterisieren. Bei sehr hohen Frequenzen hängen die Leitungsparameter dann nicht mehr nur von den Abmessungen der Leitung, sondern auch vom Strom ab und müssen damit iterativ bestimmt werden.
Untersuchungen zur Störkopplung und Schirmdämpfung von Elektro- und Hybridfahrzeugen
Creators: name: Müller, Norman
name: Wunderlich, Tom
name: Winkler, Andre
name: Richter, Matthias
name: Jacob, Felix
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Bordnetz
subject: Elektrofahrzeug
subject: Hybridfahrzeug
subject: Kraftfahrzeug
subject: Schaltvorgang
subject: elektrisches Antriebssystem
subject: Fahrzeugelektronik
subject: Störsignal
subject: Umrichter
subject: DC-DC-Wandler
subject: Messverfahren
subject: Kontaktierung
subject: mechanische Beanspruchung
subject: Fahrzeugtest
subject: Steckverbinder
subject: Schirmdämpfung
subject: Hochvoltbordnetz
subject: Komponententest
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: In Elektro- und Hybridfahrzeugen wird das konventionelle 12 V-Bordnetz um ein Hochvoltbordnetz zur Realisierung des elektrischen Traktionssystems erweitert. Durch die Integration wird die Komplexität der Fahrzeugelektronik deutlich gesteigert und eine wesentlich höhere Spannungsebene (bis 1000 V) eingeführt. Aufgrund von funktionell bedingten, schnellen Schaltvorgängen erzeugen die neuen elektronischen Hochvoltkomponenten wie beispielsweise der leistungselektronische Umrichter oder der DC-DC-Wandler Störungen, die bisher im Kraftfahrzeug nicht auftraten. Damit diese Störsignale die fehlerfreie Funktion anderer Elektroniksysteme im Fahrzeug nicht beeinflussen, wird das gesamte Hochvoltsystem u. a. als vollständig geschirmtes System in das Fahrzeug integriert. Andernfalls bietet sich zwischen beiden koexistierenden Bordnetzen ein besonders hohes Verkopplungspotential. Im Mittelpunkt des Beitrags steht die Analyse des Störpotentials von elektrischen Antriebssystemen in elektrisch betriebenen Kraftfahrzeugen. Als Ergebnis zeigt sich, dass eine hochqualitative Schirmung des HV-Systems unabdingbar ist. Diese Schirmung kann dann durch Verlegungsoptionen beeinflusst werden. Daher soll im Beitrag u. a. gezeigt werden, wodurch die Schirmdämpfung real verlegter Leitungen abhängig ist. Es werden Erfahrungen mit verschiedenen Messverfahren vorgestellt, die mit Simulationen zu "worst case" Betrachtungen gegenübergestellt werden. Die EMV-Eigenschaften des Hochvoltsystems werden entscheidend durch die Leitungen und der dazugehörigen Kontaktierungen beeinflusst. Im Beitrag werden daher des Weiteren Ergebnisse und Erfahrungen zur messtechnischen Umsetzung der Untersuchungen, u. a. zur nominellen und realen Bestimmung der Transferimpedanz von Hochvoltleitungen vorgestellt. In den Vergleich werden dabei Einflüsse mechanischer Beanspruchung (Biegeradien), aufbau-bedingter Eigenschaften (Querschnitt, Schirmaufbau) sowie Steckverbindern einbezogen. Auf Basis der Leitungsuntersuchungen und Ergebnissen von Komponenten- sowie Fahrzeugtests steht im Fazit des Beitrages die Zusammenführung des Störpotentials zur Wirkung der Schirmung von Hochvoltleitungen bzw. kompletten Hochvoltsystemen in Elektro- und Hybridfahrzeugen.
Bewertung des Blitzschutzes von Schaltanlagen und Betriebsmitteln der Hoch- und Mittelspannung durch Simulationen
Creators: name: Petranovic, Ricard
Publisher: name: Berlin : VDE-Verlag
Year: 2014
Subjects: subject: Blitzschutz
subject: Hochspannung
subject: Isolationskoordination
subject: Prüfspannung
subject: Anlagensicherung
subject: gasisolierte Schaltanlage
subject: Freiluftanlage
subject: elektrisches Betriebsmittel
subject: Überspannungsableiter
subject: Hochspannungsmast
subject: Blitzeinschlag
subject: kritischer Strom
subject: Spannungswelle
subject: Schaltanlage
subject: Mittelspannung
subject: Stehspannung
subject: Restspannung
subject: Spannungsbelastung
subject: Konferenzschrift
subject: Dewey Decimal Classification::600 | Technik
subject: Dewey Decimal Classification::600 | Technik::620 | Ingenieurwissenschaften und Maschinenbau::621 | Angewandte Physik::621,3 | Elektrotechnik, Elektronik

description: Blitzeinschläge stellen für elektrische Betriebsmittel hinsichtlich der Isolationskoordination die höchsten auftretenden Belastungen dar. Trotz der Prüfung der Betriebsmittel mit einer Stehspannung, die nach der höchsten Spannung für Betriebsmittel Um ausgesucht wird, kann bei verschiedenen Konfigurationen von Schaltanlagen ein Überschreiten dieser Prüfspannung und somit ein Isolationsversagen erfolgen. Da es, speziell für die höheren Spannungsebenen (Um>245 kV), nicht wirtschaftlich ist alle wahrscheinlichen Überspannungen abzudecken, sollte man hier fallweise den nötigen zusätzlichen Anlagenschutz mit Hilfe von Simulationen ermitteln. Dafür kommen i.d.R. Überspannungsableiter zum Einsatz, die die einlaufende Blitzspannungswelle auf die Restspannung Ures des Ableiters begrenzen. Da Ableiter für gasisolierte Schaltanlagen, im Vergleich zu Ableitern in Freiluftschaltanlagen, in höheren Spannungsebenen teuer sind, sollte man diese zur Vermeidung von Kosten nur dort einsetzen, wo sie auch benötigt werden. Eine solche Bewertung wird am besten mit einer Simulation an einem entsprechenden Modell durchgeführt. Hierbei werden zuerst anhand der Mastgeometrie der direkt an der Anlage angrenzenden Hochspannungsmasten die kritischen Blitzströme ermittelt. Das Modell der Anlage wird dann mit diesen Blitzparametern beaufschlagt, um die auftretenden Spannungsbelastungen zu untersuchen. Dabei wird mit dem letzten Mast vor der Schaltanlage, dem sogenannten Abspannmast, begonnen. Mit der maximal zulässigen Überspannung der Betriebsmittel kann dann bewertet werden, bei welchen Einschlagorten noch unzulässig hohe Überspannungen auftreten und an welchen Stellen Ableiter zum Schutz notwendig sind. Im Folgenden werden die einzelnen Schritte anhand eines Beispiels näher erläutert und die Ergebnisse diskutiert.
DIFFERENT ESTIMATION METHODS FOR TOPP-LEONE-(A) MODEL: INFERENCE AND APPLICATIONS TO COMPLETE AND CENSORED DATASETS
Creators: name: Adubisi O.D.
name: Adubisi, C.E.
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: (A)-model
Censoring
Estimation methods
Simulation
Topp-Leone-G class

description: This work proposes a new two-parameter model, titled Topp-Leone (A) model. The main benefit of the new model is that it has an inverted bathtub shaped curve, increasing and decreasing hazard rate function quite dependent on the shape parameter. Its structural properties including the ordinary moments, quantiles, probability weighted moment, median, entropy and order statistics are derived. More so, the survival, failure rate, reversed failure rate and cumulative failure rate functions are also derived. Six classical estimation methods are discussed for estimating the parameters of the new model. Monte Carlo experiments and real datasets analyses are conducted to examine the classical estimators performance of this model. Finally, the usefulness of the Topp-Leone (A) model demonstrated with different applications to complete and type-II right censored data proves its more flexible when compared to well-known models in statistical literature.
Potamogeton pusillus L.
Creators: name: Becherer
Publisher: name: Zenodo
Year: 1956
Subjects: Biodiversity
Taxonomy

description: P.pusillus L. Cat. 333. l-2: In Outre-Rhoneund bei Fully nur in der var.mucronulatus G.Fischer (Gams).- 3:Lacde Chanrionim Val de Bagnes,2386m (Schröter1896); zwischenMartigny und Charrat (F.). Forma retifolius G.Fischer - l: Outre-Rhône (E. Thomas, J. Muret, Gams). Forma acutus G. Fischer - 2: Kanal Branson-Follateres (Garns).
description: Published as part of Becherer, 1956, Florae Vallesiacae Supplementum, pp. 1-556 in Denkschriften der Schweizerischen Naturforschenden Gesellschaft 71 on pages 1-556
An Experimental Investigation of the Stresses in Extruded Sections Commonly Used in Aircraft Construction
Creators: name: Dunn, Louis Gerhardus
Publisher: name: California Institute of Technology
Year: 1938
Subjects: Aeronautical Engineering
Aeronautics

description: The extensive use of reinforced duralumin sheet in aircraft construction makes it desirable to know the behaviour of such structures under load. This paper deals principally with the experimental results obtained by testing a large number of reinforced panels of various lengths under direct compression.

The main purpose of the investigation was to determine the ultimate stresses in the reinforcing members, which in this case were bulb-angles of a size commonly used in aircraft constrution. It was, however, felt that it would be desirable to obtain as much information from the tests as possible. Consequesntly the stresses in the bulb-angles were measured at intermediate loads for a number of panels. From this data it was possible to determine that portion of the total load carried by either the skin or the bulb-angles throughout the entire range of load.
On hvLif-like solutions in gauged Supergravity
Creators: name: Bueno, P.
name: Chemissany, W.
name: Shahbazi, C.S
Publisher: name: New York : Springer
Year: 2014
Subjects: subject: Gauge Coupling Constant
subject: Hamiltonian Constraint
subject: Scalar Field
subject: Hyperscaling Violation
subject: Attractor Point
subject: Extremal Black Hole
subject: Cosmological Constant
subject: Dyonic Solution
subject: Flat Direction
subject: Coupling Function
subject: Dilaton Field
subject: Energy-momentum Tensor
subject: Gravity Theory
subject: Negative Cosmological Constant
subject: black-holes
subject: hyperscaling violation
subject: supergravity
subject: Dewey Decimal Classification::500 | Naturwissenschaften::530 | Physik

description: We perform a thorough investigation of Lifshitz-like metrics with hyperscaling violation (hvLif) in four-dimensional theories of gravity coupled to an arbitrary number of scalars and vector fields, obtaining new solutions, electric, magnetic, and dyonic, that include the known ones as particular cases. After establishing some general results on the properties of purely hvLif solutions, we apply the previous formalism to the case of N=2, d=4 supergravity in the presence of Fayet–Iliopoulos terms, obtaining particular solutions to the t3-model, and explicitly embedding some of them in Type-IIB string theory.
Stability Derivatives of Helicopter Rotors
Creators: name: Dykes, John Christopher
Publisher: name: California Institute of Technology
Year: 1938
Subjects: Aeronautics
Aeronautical Engineering

description: At present there are only three published papers dealing with the stability of helicopters, all based on helicopters with rigid rotors.  Since all rotors are, in practice, constructed with the blades free to "flap", these analyses are not sufficiently general.

Below, the blade motion equation has been written in terms of small incremental accelerations and velocities; for which an approximate solution is obtained.  This is then used to calculate the actual forces and moments that are produced on the rotor; by taking suitable mean values, it has been found possible to express these forces and moments without reference to the actual position of the blades at that instant, but only as functions of the position of the whole helicopter.  The aerodynamic mechanism of the rotor has therefore been expressed in a a series of equations, and the stability of the helicopter now becomes solely a dynamical problem.

It appears that a helicopter is most likely to become unstable when hovering; this analysis is confined to this case.

Calculated values for a helicopter of the same size as the "C.30" autogyro, are given to show the dimensions of the various forces and moments.
Maximum sinking velocities of suspended particulate matter in a coastal transition zone
Creators: name: Maerz, Joeran
name: Hofmeister, Richard
name: Van Der Lee, Eefke M.
name: Gräwe, Ulf
name: Riethmüller, Rolf
name: Wirtz, Kai W.
Publisher: name: Göttingen : Copernicus GmbH
Year: 2016
Subjects: subject: algae
subject: Dewey Decimal Classification::500 | Naturwissenschaften::550 | Geowissenschaften

description: Marine coastal ecosystem functioning is crucially linked to the transport and fate of suspended particulate matter (SPM). Transport of SPM is controlled by, amongst other factors, sinking velocity ws. Since the ws of cohesive SPM aggregates varies significantly with size and composition of the mineral and organic origin, ws exhibits large spatial variability along gradients of turbulence, SPM concentration (SPMC) and SPM composition. In this study, we retrieved ws for the German Bight, North Sea, by combining measured vertical turbidity profiles with simulation results for turbulent eddy diffusivity. We analyzed ws with respect to modeled prevailing dissipation rates ϵ and found that mean ws were significantly enhanced around log10(ϵ (m2 s−3)) ≈ −5.5. This ϵ region is typically found at water depths of approximately 15 to 20 m along cross-shore transects. Across this zone, SPMC declines towards the offshore waters and a change in particle composition occurs. This characterizes a transition zone with potentially enhanced vertical fluxes. Our findings contribute to the conceptual understanding of nutrient cycling in the coastal region which is as follows. Previous studies identified an estuarine circulation. Its residual landward-oriented bottom currents are loaded with SPM, particularly within the transition zone. This retains and traps fine sediments and particulate-bound nutrients in coastal waters where organic components of SPM become remineralized. Residual surface currents transport dissolved nutrients offshore, where they are again consumed by phytoplankton. Algae excrete extracellular polymeric substances which are known to mediate mineral aggregation and thus sedimentation. This probably takes place particularly in the transition zone and completes the coastal nutrient cycle. The efficiency of the transition zone for retention is thus suggested as an important mechanism that underlies the often observed nutrient gradients towards the coast.
A Tertiary Mammalian Fauna From the Avawatz Mountains, California
Creators: name: Henshaw, Paul Carrington
Publisher: name: California Institute of Technology
Year: 1938
Subjects: subject: Geology
subject: FOS: Earth and related environmental sciences
subject: plutonic rocks
subject: alluvium
subject: metamorphic rocks
subject: fossil vertebrate
subject: Paleontology
subject: Avawatz Mountains
subject: basement complex
subject: sedimentary rocks

description: The Tertiary mammal occurrence in the Avawatz Mountains, discovered in 1932 by H. W. Nickerson of Yucca Grove, California, was first reported to the Los Angeles County Museum.  W. M. Strong, sent out by the Museum to make a preliminary survey in the area, assembled a small collection.  All of the material was so scrappy, however, that interest subsided.  Subsequently, in 1935, in the course of their archeological field studies, Mr. and Mrs. William H. Campbell of Twenty-Nine Palms rediscovered the fossiliferous locality on the south flank of the Avawatz Mountains.  Very kindly drawing the attention of Mr. E. L. Furlong to their find, Mr. and Mrs. Campbell accompanied Mr. Furlong to the locality.  During this first visit most of the material now in the collections of the California Institute of Technology was acquired.  Since then several brief collecting trips have been made to the area.
EMPIRICAL STUDY ON ROBUST REGRESSION ESTIMATORS AND THEIR PERFORMANCE
Creators: name: Lakshmi, R.
name: Sajesh, T.A.
Publisher: name: Reliability: Theory & Applications
Year: 2023
Subjects: robust Sn regression
influential observations
modelling
data analysis

description: Regression Analysis is statistical technique to model data. But the presence of outliers and influential points affect data modelling and its interpretation. Robust regression analysis is an alternative choice to this. Here we made an attempt to study different robust estimators and propose a new robust reweighted Sn covariance based regression estimator. We have evaluated the performance empirically and the simulation study shows our proposed estimator is preferable to OLS and other robust regression estimators in terms of the MSE criteria. Also, proposed robust Sn covariance regression estimator produce outperforming results for regression equivaraince and breakdown criterion. Robustness of the proposed estimator is proved empirically. The proposed method is innovatively used to model fluid data. R software is used for simulation and study.
Hidden Symmetries and Geodesics of Kerr spacetime in Kaluza-Klein Theory
Creators: name: Aliev, Alikram N.
name: Esmer, Goksel Daylan
Publisher: name: arXiv
Year: 2013
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The Kerr spacetime in Kaluza-Klein theory describes a rotating black hole in four dimensions from the Kaluza-Klein point of view and involves the signature of an extra dimension that shows up through the appearance of the electric and dilaton charges. In this paper, we study the separability properties of the Hamilton-Jacobi equation for geodesics and the associated hidden symmetries in the spacetime of the Kerr-Kaluza-Klein black hole. We show that the complete separation of variables occurs only for massless geodesics, implying the existence of hidden symmetries generated by a second rank conformal Killing tensor. Employing a simple procedure built up on an "effective" metric, which is conformally related to the original spacetime metric and admits a complete separability structure, we construct the explicit expression for the conformal Killing tensor. Next, we study the properties of the geodesic motion in the equatorial plane, focusing on the cases of static and rotating Kaluza-Klein black holes separately. In both cases, we obtain the defining equations for the boundaries of the regions of existence, boundedness and stability of the circular orbits as well as the analytical formulas for the orbital frequency, the radial and vertical epicyclic frequencies of the geodesic motion. Performing a detailed numerical analysis of these equations and frequencies, we show that the physical effect of the extra dimension amounts to the significant enlarging of the regions of existence, boundedness and stability towards the event horizon, regardless of the classes of orbits.
description: 25 pages, 5 figures; REVTeX