cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Isolation and characterization of phytoconstituents from Myanmar medicinal plants
Creators: name: Khine, Myint Myint
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2006
Subjects: subject: Elektronische Publikation
subject: Hochschulschrift
subject: Online-Publikation
subject: Zsfassung in dt. Sprache
subject: 615.3

description: * Die vorliegende Arbeit beschäftigt sich mit der Isolierung und Charakterisierung von Inhaltsstoffen aus drei traditionellen Arzneipflanzen Streptocaulon tomentosum Wight & Arnott (Asclepiadaceae), Curcuma comosa Roxb. (Zingiberaceae) und Vitis repens Wight & Arm. (Vitaceae). * Triterpenoide, Cardenolide, Lignan, und Pregnane glycoside (3 neue Verbindungen) wurden aus Streptocaulon tomentosum (Wurzel) isoliert. * Curcuminoide und Sesquiterpenoide (davon 9 neue Verbindungen) wurden aus Curcuma comosa (Rhizome) characterisiert. * Polyphenole und Lignan wurden aus Vitis repens (Rhizome) characterisiert. * Vier Extrakten (n-Hexan, Ethylacetat und n-Butanol) der drei Pflanzen wurden auf eine mögliche fungizide Wirkung getestet (Testorganismus: Cladosporium cucumerinum). * Ausserdem wurden Gegenkrebswirkung (2 Zell Linien; L929 (Mausfibroblasten) und MCF-7 (humane Bustkrebszellinie) von sechs Cardenolide beim 100 μM schon untersucht. Davon 17α-H-periplogenin-3-O-β-D-digitoxoside und 17α-H-periplogenin-3-O-β-D-cymaroside haben Antiproliferative Aktivität (IC50 values, < 1μM) gegen MCF-7. Vier Cardenolide wurden Zelllebensfähigkeit (2 Zell linien tumor Zell und U 937) beim 100 μM, 10 μM, und 1 μM schon getestet. Alle vier Cardenolide zeigen Antiproliferative Aktivität beim 100 μM und 10 μM gegen beiden Zell Linien.
description: * This thesis describes the isolation, the characterization and pharmacological activities of phytoconstituents from the Myanmar medicinal plants Streptocaulon tomentosum Wight & Arnott (Asclepiadaceae), Curcuma comosa Roxb. (Zingiberaceae) and Vitis repens Wight & Arm. (Vitaceae). * Triterpenoids, cardenolides, lignanes, and steroidal saponines including three new substances were isolated from the roots of Streptocaulon tomentosum. * Curcuminoids and sesquiterpenoids including nine new sesquiterpenes were characterized from the rhizome of Curcuma comosa * Polyphenols, fatty acids, and lignanes were obtained from the rhizome of Vitis repens. * Four extracts of each plant were tested for their antifungal properties against Cladosporium cucumerinum Ell. & Arth. according to Gottstein et al. (1982). * Six cardenolides isolated from Streptocaulon tomentosum were tested for their antiproliferative activity in vitro against MCF-7 (human breast cancer cell line) and L 929 (mouse fibroblast cell line). Among six cardenolides, 17α-H-periplogenin-3-O-β-D-digitoxoside, and 17α-H-periplogenin-3-O-β-D-cymaroside exhibit significant antiproliferative activity (IC50 values, < 1μM) against MCF-7. Four cardenolides were examined for their cellular viability in the tumor cell and U 937 (human leukemic cell line) at concentrations 100 μM, 10 μM, and 1 μM. All these four cardenolides show the induction of apoptosis at 100 μM and 10 μM in both cell lines.
Closed Aspherical Manifolds with Center
Creators: name: Cappell, Sylvain
name: Weinberger, Shmuel
name: Yan, Min
Publisher: name: arXiv
Year: 2011
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics

description: We show that in all dimensions >7 there are closed aspherical manifolds whose fundamental groups have nontrivial center but do not possess any topological circle actions. This disproves a conjectured converse (proposed by Conner and Raymond) to a classical theorem of Borel.
description: 13 pages
A 2 GHz Fully Balanced Switching HBT Mixer
Creators: name: Tempel, Mike
name: Huber, Meik
name: Boeck, Georg
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: This paper describes a highly linear lowvoltage
2 GHz AlGaAs HBT fully balanced downconversion
mixer. The circuit is designed to operate with a supply
voltage from 4.2V down to 3.2V. Both input ports ( LO/RF )
are single ended and well matched to 50  . Our results show
a conversion gain of -7 dB and a third-order intercept point
of 7 dBm realized at 3.6 V.
The mixer utilizes 3 x 30  m2 single-finger HBTs fabricated
in an Infineon AlGaAs/GaAs bipolar process. The size of the
chip is 1 x 1 mm2.
Biodiversität der O- und H-Antigene von Escherichia coli - serologische und molekulare Identifizierung
Creators: name: Fruth, Angelika
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2005
Subjects: subject: Elektronische Publikation
subject: Zsfassung in engl. Sprache
subject: 571.964529342

description: Mit Hilfe eines "Mikrotiter-Agglutionationsassay" und eigen hergestellter Testseren, sowie der Einhaltung optimaler Kulturbedingungen für die Bildung der O- und H-Antigene von E. coli wurde eine Standard Operation Procedure (SOP) erstellt und an 235 Referenzstämmen für die Serotypie dieser Antigene der WHO-Zentrale für Klebsiella und E. coli, Kopenhagen, DK, sowie 4431 E. coli -Isolaten der Stammsammlung des Nationalen Referenzzentrum für Salmonellen und andere bakterielle Enteritiserreger, Robert Koch-Institut, Bereich Wernigerode, D, erprobt. Diese SOP wurde als wissenschaftlich gesichert in der Routinediagnostik des NRZ, sowie in Ringversuchen (EQA) erfolgreich eingeführt. Die Ergebnisse der standardisierten Serotypie wurden mit molekularen Techniken überprüft. Dazu kam die Analyse der LPS-Muster für die Bestimmung der O-Antigene und der fliC-PCR-RFLP für die H-Antigene zur Anwendung. Es konnte mit der molekularen Erfassung der LPS- und der fliC-Polymorphismen bestätigt werden, dass die Serotypie sichere und reproduzierbare Ergebnisse liefert. Daher bleibt die Serotypie als "Gold-Standard" der epidemiologischen Subdifferenzierung sozusagen als Klassenmerkmal von E. coli bestehen und nimmt einen ähnlichen Rang ein wie die Serotypie von Salmonella enterica. Mit Hilfe der angwendeten molekularen Techniken konnten darüber hinaus neue O- und H-Antigene charakterisiert und beschrieben werden. Durch Herstellung von entsprechenden Testseren ließen sich diese neuen Serotypen serologisch bestätigen.
description: By means of a "microtiter agglutination assay" and the application of a panel of own produced antisera which are specific for the detection of the E. coli antigens of O1- O181 and H1- H56, respectively, an standard operation procedure (SOP) for serotyping of strains of this species was established. Serotyping results achieved with this SOP at 235 reference strains of the strain collection for serotyping at the WHO Centre for Klebsiella and E. coli, Copenhagen, DK, and 4431 strains of E. coli from clinical specimens of the strain collection of the NRC for Salmonella and other enterics, Robert Koch Institute, Germany. These results were compared with the respective molecular data. These data were achieved with the LPS pattern analysis for O antigens and fliC-PCR-RFLP for the H antigens. The observations allow the conclusion that the phenotypical serotyping results are in good agreement with the molecular data. Therefore, serotyping remains the "Golden Standard" for subtyping of E. coli strains for epidemiological purposes and can be applied diagnostically similar to serotyping of Salmonella enterica, as a quasi taxonomic property. Moreover, by means of LPS pattern analysis and fliC-PCR-RFLPs new serotypes have been identified. By application of respective antisera they were confirmed as new serotypes.
Interactive Diachronic Semantic Maps of the WoPoss modal markers
Creators: name: , Marongiu
name: , Dell'Oro
Publisher: name: Zenodo
Year: 2021
Subjects: diachronic semantics
modality
Latin language

description: A collection of 75 interactive diachronic semantic maps of the lexical modal markers analyzed in the framework of the WoPoss project. The drawing of the maps is based on the descriptions of the lemmas in the Thesaurus Linguae Latinae combined with the personal analysis of the relevant Latin passages carried out by the authors.
Evaluation of respiratory motion-corrected cone-beam CT at end expiration in abdominal radiotherapy sites: a prospective study
Creators: name: Kincaid, Russell E.
name: Hertanto, Agung E.
name: Hu, Yu-Chi
name: J. Wu, Abraham
name: A. Goodman, Karyn
name: Pham, Hai D.
name: Yorke, Ellen D.
name: Zhang, Qinghui
name: Chen, Qing
name: Mageras, Gig S.
Publisher: name: Taylor & Francis
Year: 2018
Subjects: subject: Biophysics
subject: Physical Sciences not elsewhere classified
subject: Medicine
subject: Cell Biology
subject: Physiology
subject: FOS: Biological sciences
subject: Marine Biology

description: Background: Cone beam computed tomography (CBCT) for radiotherapy image guidance suffers from respiratory motion artifacts. This limits soft tissue visualization and localization accuracy, particularly in abdominal sites. We report on a prospective study of respiratory motion-corrected (RMC)-CBCT to evaluate its efficacy in localizing abdominal organs and improving soft tissue visibility at end expiration. Material and methods: In an IRB approved study, 11 patients with gastroesophageal junction (GEJ) cancer and five with pancreatic cancer underwent a respiration-correlated CT (4DCT), a respiration-gated CBCT (G-CBCT) near end expiration and a one-minute free-breathing CBCT scan on a single treatment day. Respiration was recorded with an external monitor. An RMC-CBCT and an uncorrected CBCT (NC-CBCT) were computed from the free-breathing scan, based on a respiratory model of deformations derived from the 4DCT. Localization discrepancy was computed as the 3D displacement of the GEJ region (GEJ patients), or gross tumor volume (GTV) and kidneys (pancreas patients) in the NC-CBCT and RMC-CBCT relative to their positions in the G-CBCT. Similarity of soft-tissue features was measured using a normalized cross correlation (NCC) function. Results: Localization discrepancy from the end-expiration G-CBCT was reduced for RMC-CBCT compared to NC-CBCT in eight of eleven GEJ cases (mean ± standard deviation, respectively, 0.21 ± 0.11 and 0.43 ± 0.28 cm), in all five pancreatic GTVs (0.26 ± 0.21 and 0.42 ± 0.29 cm) and all ten kidneys (0.19 ± 0.13 and 0.51 ± 0.25 cm). Soft-tissue feature similarity around GEJ was higher with RMC-CBCT in nine of eleven cases (NCC =0.48 ± 0.20 and 0.43 ± 0.21), and eight of ten kidneys (0.44 ± 0.16 and 0.40 ± 0.17). Conclusions: In a prospective study of motion-corrected CBCT in GEJ and pancreas, RMC-CBCT yielded improved organ visibility and localization accuracy for gated treatment at end expiration in the majority of cases.
Bildungsdisparitäten im Berliner Umland unter besonderer Betrachtung der MINT-Fachbereiche - eine Studie zur differenzierten Betrachtung öffentlicher und privater Gymnasien
Creators: name: Stein, André
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2018
Subjects: subject: 370

description: Der Arbeit liegen zwei Annahmen zugrunde. Erstens wird davon ausgegangen, dass es einen signifikanten Leistungsunterschied im Bereich des MINT-Fächerkanons zwischen Schüler-Innen der neunten Klassen an öffentlichen und privaten Gymnasien im Berliner Umland gibt. Diese Annahme kann mithilfe der Auswertung der erhobenen Daten bestätigt werden. Zweitens wird für das Berliner Umland eine Trennung der Schülerschaft in den neunten Klassen zwischen privaten und öffentlichen Gymnasien hinsichtlich ihres sozioökonomischen Hintergrundes angenommen. Dabei fokussiert diese Untersuchung Schulen in nur einem Bundesland. Das hat den Vorteil, dass Störfaktoren, die bei anderen Studien über Bundeslandgrenzen hinweg zu berücksichtigen sind, ausgeschlossen werden können, da durch die Eingrenzung der Untersuchung auf das Berliner Umland einheitliche Lehrplanvoraussetzungen, einheitliche Stundenkontingente und einheitliche Bewertungskriterien Grundlage dieser Studie sind. Die erhobenen Daten werden mithilfe von Mittelwertvergleichen, Varianzanalysen und partiellen Korrelationen analysiert. Mögliche Ursachen der in der Studie herausgearbeiteten Leistungsdisparitäten sowie die Disparitäten des sozioökonomischen Hintergrundes der SchülerInnen werden in der Arbeit diskutiert.
description: This thesis is based on two assumptions. Firstly, it is assumed that there is a significant difference regarding the performing level of year 9 students attending private and public schools in the vicinity of Berlin, affecting subjects such as mathematics, informatics, science and technology. This theory can be proven with the results of a survey which had been carried out earlier. Secondly, it is assumed that there is a distinction between the student’s socioeconomic background in private and public schools. Other than previous studies, this examination solely focuses on schools in one federal state. As a result confounders such as the number of lessons, curriculum and assessment criteria can be avoided as these factors are uniform in the area surrounding Berlin. Previous studies, carried out in more than one federal state, have failed to be based on the same preconditions ever since. Collected data will be analyzed using a comparison of means, analysis of variance and partial correlation. Both, possible reasons in performance disparities, as well as disparities reflected in the socioeconomic background of the students will be discussed in this thesis.
Weighted likelihood estimation under two-phase sampling
Creators: name: Saegusa, Takumi
name: Wellner, Jon A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Statistics Theory (math.ST)
subject: FOS: Mathematics

description: We develop asymptotic theory for weighted likelihood estimators (WLE) under two-phase stratified sampling without replacement. We also consider several variants of WLEs involving estimated weights and calibration. A set of empirical process tools are developed including a Glivenko-Cantelli theorem, a theorem for rates of convergence of M-estimators, and a Donsker theorem for the inverse probability weighted empirical processes under two-phase sampling and sampling without replacement at the second phase. Using these general results, we derive asymptotic distributions of the WLE of a finite-dimensional parameter in a general semiparametric model where an estimator of a nuisance parameter is estimable either at regular or nonregular rates. We illustrate these results and methods in the Cox model with right censoring and interval censoring. We compare the methods via their asymptotic variances under both sampling without replacement and the more usual (and easier to analyze) assumption of Bernoulli sampling at the second phase.
description: Published in at http://dx.doi.org/10.1214/12-AOS1073 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of Mathematical Statistics (http://www.imstat.org)
An Array-Based Design Methodology for the
Realisation of 94GHz MMMIC Amplifiers
Creators: name: Elgaid, K.
name: McLelland, H.
name: Ferguson, S.
name: Cao, Xin
name: Boyd, E.
name: Moran, D.
name: Thoms, S.
name: Zhou, H.
name: Wilkinson, C.D.W.
name: Stanley, C.R.
name: Thayne, I. G.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: In this paper we report an array-based
design methodology for the realisation of monolithic
millimetre-wave integrated circuits (MMMICs). This work
focuses on the realisation of a 94GHz MMMIC amplifier
using an array-based approach by integrating high
performance 50nm T-gate InP-HEMTs with an fT of
480GHz and a Si3N4 Metal Insulator Metal (MIM) capacitor
technology formed using room temperature inductively
coupled plasma chemical vapour deposition (ICP-CVD)
nitride deposition together with a range of more
conventional coplanar waveguide-based passive
components. A single stage amplifier, predicted to have a
gain of 8 dB and return loss of better than –10dB at 94 GHz,
demonstrated experimentally a gain of 8dB and a return
loss of better than -6dB across a bandwidth of 7GHz from
89GHz to 96GHz at the designed bias point . The use of a
room temperature nitride deposition process allows all
passive components to be realised after active device
realisation, and enables a mm-wave “sea-of-gates” arraybased
design methodology.
A Highly Integrated GaAs pHEMT Active
Mixer for Wideband SAR Systems
Creators: name: Johansen, Tom K.
name: Vidkjær, Jens
name: Krozer, Viktor
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: This paper presents the design and performance
of a GaAs pHEMT active mixer for wideband
Synthetic Apertur Radar (SAR) systems. The active mixer
is highly integrated and includes active baluns on the
RF/LO ports, active combiner on the IF port and a Gilbert
Cell mixer core. The active mixer demonstrates a 10 dB
conversion gain over a 9.5 GHz RF port bandwidth. A
conversion gain variation of ±0.25dB is achieved over
a 800 MHz signal bandwidth for frequency conversion
between C- and L-band making the active mixer suitable
for SAR systems.
Improved Performance of Flip Chip assembled MMIC Amplifiers
on LTCC using a Photonic Bandgap Structure
Creators: name: Ziroff, A.
name: Nalezinski, M.
name: Menzel, W.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: Further cost reduction in today’s microwave
frontends is strongly related to assembly technology as well
as module technology. Depending on the particular mix of
technologies, specific problems and chances can be
addressed. In case of flip-chip on LTCC, various effects of
performance degradation of the MMICs can be observed,
some of which can be related to unwanted internal coupling
of the microstrip IC due to the floating groundplane. For
some MMICs a periodic structure below the chip can help to
improve the characteristics of the assembled chip due to its
ability to suppress a particular class of unwanted modes
between the chip groundplane and the module ground. The
periodic structure is proposed and measured results are
given and discussed.
Strahlentherapie des sehr alten Tumorpatienten - Indikationen, klinische Ergebnisse und Lebensqualität
Creators: name: Kaufmann, Anne
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2016
Subjects: subject: 615

description: Die gesundheitsbezogene Lebensqualität (health-related quality of life- HRQOL) ist insbesondere bei sehr alten Tumorpatienten von Bedeutung, jedoch existiert ein Mangel an spezifischen Instrumenten und Referenzdaten. Daher wurden Patienten mit einem Alter von ≥ 80 Jahren, die aufgrund maligner Krebserkrankung strahlentherapeutisch behandelt wurden, analysiert. Gesamtüberleben, Therapiecharakteristika und Komorbidität wurden in einer retrospektiven Studie erfasst (n=115). Das mediane Überleben lag bei 7,9 Monaten. Prognosefaktoren wurden ermittelt. Weiterhin wurde in einer prospektiven Studie (n=50), unter Anwendung des neuen, validierten altersspezifischen Moduls „EORTC QLQ-ELD14“ die HRQOL zu Beginn, Ende und 6 Monate nach RT erfasst. Während der Therapie zeigten sich keine signifikanten Veränderungen der HRQOL, jedoch verschlechterte sich diese in allgemeinen und altersspezifischen Domänen nach 6 Monaten. Die Ergebnisse implizieren einen Interventionsbedarf für diese Altersgruppe.
description: In very elderly cancer patients, health-related quality of life (HRQOL) is a particularly important issue but has rarely been studied due to a lack of specific instruments and of reference data. Therefore patients with an age of ≥ 80 years undergoing radiotherapy (RT) due to cancer were analysed. Overall survival, medical intention, treatment characteristics and comorbidity were determined in a retrospective study (n=115). Median overall survival was 7.9 months. Predictive factors were ascertained. Furthermore we performed a prospective analysis of HRQOL (n=50) using the newly validated elderly-specific HRQOL module “EORTC QLQ-ELD14”. HRQOL was assessed at the start, end and 6 months after RT. No significant changes in any HRQOL domain were observed during the course of treatment, but deteriorated in general and elderly-specific areas thereafter, suggesting a need for specific supportive interventions for this age group.
Figure S2 from The histone deacetylase NlHDAC1 regulates both female and male fertility in the brown planthopper, Nilaparvata lugens
Creators: name: Zhang, Jin-Li
name: Yuan, Xiao-Bo
name: Chen, Sun-Jie
name: Chen, Hao-Hao
name: Xu, Nan
name: Xue, Wen-Hua
name: Fu, Sheng-Jie
name: Zhang, Chuan-Xi
name: Xu, Hai-Jun
Publisher: name: The Royal Society
Year: 2018

description: Histone acetylation is a specific type of chromatin modifications that serves as a key regulatory mechanism for many cellular processes in mammals. However, little is known about its biological function in invertebrates. Here, we identified 12 members of histone deacetylases (NlHDACs) in the brown planthopper (BPH), Nilaparvata lugens. RNAi-mediated silencing assay showed that the NlHdac1, NlHdac3 and NlHdac4 played critical roles in female fertility via regulating ovary maturation or ovipositor development. Silencing of NlHdac1 substantially increased acetylation level of histones H3 and H4 in ovaries, indicating NlHDAC1 is the main histone deacetylase in ovaries of BPH. RNA sequencing (RNA-seq) analysis showed that knockdown of NlHdac1 impaired ovary development via multiple signalling pathways including the TOR pathway. Acoustic recording showed that males with NlHdac1 knockdown failed to make courtship songs, and thus were unacceptable to wild-type females, resulting in unfertilized eggs. Competition mating assay showed that wild-type females overwhelmingly preferred to mate with control males over NlHdac1-knockdown. These findings improve our understanding of reproductive strategies controlled by HDACs in insects and provide a potential target for pest control.
Indirect Searches for Dark Matter: a status review
Creators: name: Cirelli, Marco
Publisher: name: arXiv
Year: 2012
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: I review in a schematic way the current status of indirect searches for Dark Matter: I list the main relevant experimental results of the recent years and I discuss the excitements and disappointments that their phenomenological interpretations in terms of almost-standard annihilating Dark Matter have brought along. I then try to individuate the main directions which have emerged from the recent very intense model-building activity. In passing, I list the main sources of uncertainties that affect this kind of searches.
description: 32 pages, several figures. Extended version of the text for the Proceedings of Lepton-Photon 2011, Mumbai. Comments and notifications of inaccuracies, oversights or omissions are welcome (except on ref. [154]). v2: refs added. v3: updated bounds and added short discussions of gamma-ray line claims. (v4: just a couple of corrections in refs.) v5: more refs & details added, updated neutrino bounds
Investigation of Thermal Crunching Effects in
Fishbone-Type Layout Power GaAs-HBTs
Creators: name: Rudolph, M.
name: Schnieder, F.
name: Heinrich, W.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2004
Subjects: ING-INF/01 Elettronica

description: Thermal current crunching in power HBTs is investigated
by numerical simulation. Compact electro-thermal models
are connected in parallel, thermal interaction is accounted for
by a thermal resistance matrix. It turnes out that the dominant effect in HBTs of fishbone-type layout is that half of the HBT is effectively switched off. This can only be simulated by a slightly
asymmetric model.
Study of Titanium Tungsten Nitride and Tungsten Nitride Schottky Diodes on n-GaN
Creators: name: Lee, C. S.
name: Chang, E. Y.
name: Biswas, D.
name: Chang, Li
name: Huang, J. S.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: The Schottky diode behaviors of the TiWNx and the WNx Schottky contacts to n-GaN were investigated at different annealing temperatures. Both TiWNx and WNx films were deposited by reactive dc sputtering method. The X-ray diffraction data and secondary ion mass spectroscopy analysis showed that no interfacial phases were formed during the thermal treatment process. The WNx/n-GaN contact exhibited excellent electrical characteristics even after rapid-thermal annealed up to 850? for 10 seconds. The ideality factor and barrier height remained 1.09 and 0.80 eV respectively after 850? annealing. However, the TiWNx/n-GaN contact was thermally stable only up to 650? annealing, the values of the ideality factor and the barrier height were 1.14 and 0.76 eV respectively after 650? annealing and started to degrade when annealed at higher temperatures. The deterioration of the TiWNx/n-GaN contact at higher temperatures was due to the inter-diffusion of the TiWN film and the GaN material.
Negative Uniaxial Optical Behaviour of Laminated Polarization Beam-splitters.
Creators: name: Massaro, A.
name: Di Donato, A.
name: Rozzi, T.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: In the construction of polarization beam-splitters (PBS) and switches a structure can be employed, that is based on the birefringence of periodically laminated dielectric thin films [2,7]. In this work we derive an estimate of the split angle in laminated polarization splitters behaving as negative uniaxial crystals, in the case of oblique incidence. This analysis has been applied to an artificial anisotropic dielectric medium realized by means of layers of a-Si:H and SiO2 [7].
Complex biochemical reactors for selenium and sulphate reduction : organic material biodegradation and microbial community shifts
Creators: name: Mirjafari, Parissa
Publisher: name: University of British Columbia
Year: 2014

description: Biochemical reactors using complex organic materials for treatment of mine-affected waters are attractive low-cost solutions, but their widespread adoption is severely limited by poor reliability and limited longevity. This is in part due to lack of guidance on which organic materials to use, their degradation over time, and how this affects the microbial community composition, which in turn influences reactor performance. Continuous-flow column bioreactors containing differing ratios of a wood, hay and manure mixture were operated for 159 to 430 days including successful and decline phases of performance. Reactor performance, detailed organic matter composition and microbial community structure were measured for reactors with different wood to hay ratios and after different times of operation. Reactors with more hay than wood reduced sulphate from 500 mg/L to less than 100 mg/L and selenium from 20.3 µg/L to less than 0.2 µg/L with a retention time of 14 days for the whole period of operation. Whereas reactors with a high wood to hay ratio operated successfully for 100-200 days after which their performance fluctuated. Increase in more readily available organic compounds with decrease in recalcitrant fibrous materials was charted over time and correlated with changes in microbial community composition. More hemicellulose and α-cellulose were consumed in the bioreactors with more hay content. Lignin content remained the same for the wood rich bioreactors, and increased in the hay-rich columns. Ash content in bioreactors with either organic mixture increased over time. The labile components, determined as neutral detergent and water soluble compounds, fluctuated cyclically. The microbial communities that evolved in the bioreactors were distinctly different from those present initially. At the early stages, the communities were rich in organic matter degraders classified in the Bacteroides, Parabacteroides and Ruminococcaceae taxonomic groups. There was a shift towards Methanogens and Mollicutes and Spirochaetes classified groups for the longer running bioreactors. Sulphate reducing bacteria were mostly Desulfobulbus and Desulfovibrio related and they were more prevalent in the presence of high sulphate throughout the reactor history.
Aperiodic tilings of manifolds of intermediate growth
Creators: name: Marcinkowski, Michał
name: Nowak, Piotr W.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Group Theory (math.GR)
subject: Dynamical Systems (math.DS)
subject: Geometric Topology (math.GT)
subject: Metric Geometry (math.MG)
subject: FOS: Mathematics

description: We give a homological construction of aperiodic tiles for certain open Riemannian surfaces admitting actions of Grigorchuk groups of intermediate growth.
description: Accepted for publication in Groups, Geometry and Dynamics
Beeinflussung der Konzentrationen männlicher und weiblicher Sexualhormone durch Hämodialyse und Kontinuierliche ambulante Peritonealdialyse
Creators: name: Böttcher, Frank
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2001
Subjects: Elektronische Publikation
Zsfassung in engl. Sprache

description: In der Literatur gibt es klinische und theoretische Daten darüber, dass bei niereninsuffizienten, mittels Hämo-oder Peritonealdialyse behandelten Patienten, Störungen der Sexualfunktionen auftreten. Bei dialysepflichtigen Frauen wurden gehäuft Zyklusstörungen beobachtet. Wir untersuchten die Konzentrationen ausgewählter Sexualhormone im Serum von 21 dialysepflichtigen Männern und Frauen über einen Zeitraum von 13 Monaten. Die zum Teil pathologisch veränderten Hormonserumkonzentrationen waren im Studienverlauf, trotz optimierter Dialysebehandlung, weitgehend konstant nachweisbar. Die Ursachen sind vielschichtig und noch unvollständig geklärt.
description: In the literature are clinical and theoretical facts to find about patients with chronic renal failure on regular haemo - or peritoneal dialysis with disturbances in sexual function. Woman with chronic renal failure have more dysfunctions in cycle. We investigated concentrations of special sexualhormons in the serum of 21uramic woman and men on regular haemo - or peritoneal dialysis over 13 mounts. We found partly pathological concentrations in the course of study nearly constant, in spite of optimize dialysis treatment. Reasons are complex and not quite understand.
Unitary Standard Model from Spontaneous Dimensional Reduction and Weak Boson Scattering at the LHC
Creators: name: He, Hong-Jian
name: Xianyu, Zhong-Zhi
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: General Relativity and Quantum Cosmology (gr-qc)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: Spontaneous dimensional reduction (SDR) is a striking phenomenon predicted by a number of quantum gravity approaches which all indicate that the spacetime dimensions get reduced at high energies. In this work, we formulate an effective theory of electroweak interactions based upon the standard model, incorporating the spontaneous reduction of space-dimensions at TeV scale. The electroweak gauge symmetry is nonlinearly realized with or without a Higgs boson. We demonstrate that the SDR ensures good high energy behavior and predicts unitary weak boson scattering. For a light Higgs boson of mass 125GeV, the TeV-scale SDR gives a natural solution to the hierarchy problem. Such a light Higgs boson can have induced anomalous gauge couplings from the TeV-scale SDR. We find that the corresponding WW scattering cross sections become unitary at TeV scale, but exhibit different behaviors from that of the 4d standard model. These can be discriminated by the WW scattering experiments at the LHC.
description: 38pp, Eur.Phys.J.(in Press); extended discussions for testing non-SM Higgs boson(125GeV) via WW scattering; minor clarifications added; references added; a concise companion is given in the short PLB letter arXiv:1301.4570
State Concentration Exponent as a Measure of Quickness in Kauffman-type Networks
Creators: name: Amari, Shun-ichi
name: Ando, Hiroyasu
name: Toyoizumi, Taro
name: Masuda, Naoki
Publisher: name: arXiv
Year: 2012
Subjects: subject: Disordered Systems and Neural Networks (cond-mat.dis-nn)
subject: Adaptation and Self-Organizing Systems (nlin.AO)
subject: FOS: Physical sciences

description: We study the dynamics of randomly connected networks composed of binary Boolean elements and those composed of binary majority vote elements. We elucidate their differences in both sparsely and densely connected cases. The quickness of large network dynamics is usually quantified by the length of transient paths, an analytically intractable measure. For discrete-time dynamics of networks of binary elements, we address this dilemma with an alternative unified framework by using a concept termed state concentration, defined as the exponent of the average number of t-step ancestors in state transition graphs. The state transition graph is defined by nodes corresponding to network states and directed links corresponding to transitions. Using this exponent, we interrogate the dynamics of random Boolean and majority vote networks. We find that extremely sparse Boolean networks and majority vote networks with arbitrary density achieve quickness, owing in part to long-tailed in-degree distributions. As a corollary, only relatively dense majority vote networks can achieve both quickness and robustness.
description: 6 figures
Temperature-Dependent Analysis and RF-Model of 10Gbps VCSELs
Creators: name: Nuttinck, S.
name: Gebara, E.
name: Maeng, M.
name: Laskar, J.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: 10Gbps Vertical Cavity Surface Emitting Lasers (VCSELs) are fully characterized and modeled at various temperatures of operation from DC to 15GHz. Studying devices under these conditions of operation enables one to acquire a better understanding of the device physics, and permits to build temperature-dependent VCSEL RF models necessary for accurate opto-electronic integrated circuit (OEIC) designs. The extracted model accurately predicts the reflection coefficient up to 15GHz above and below threshold at various biases and temperatures. This is the first time that a temperature-dependent RF model for VCSEL is presented.
Intransitivity and coexistence in four species cyclic games
Creators: name: Lütz, Alessandra F.
name: Risau-Gusman, Sebastián
name: Arenzon, Jeferson J.
Publisher: name: arXiv
Year: 2012
Subjects: subject: Populations and Evolution (q-bio.PE)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Biological sciences
subject: FOS: Physical sciences

description: Intransitivity is a property of connected, oriented graphs representing species interactions that may drive their coexistence even in the presence of competition, the standard example being the three species Rock-Paper-Scissors game. We consider here a generalization with four species, the minimum number of species allowing other interactions beyond the single loop (one predator, one prey). We show that, contrary to the mean field prediction, on a square lattice the model presents a transition, as the parameter setting the rate at which one species invades another changes, from a coexistence to a state in which one species gets extinct. Such a dependence on the invasion rates shows that the interaction graph structure alone is not enough to predict the outcome of such models. In addition, different invasion rates permit to tune the level of transitiveness, indicating that for the coexistence of all species to persist, there must be a minimum amount of intransitivity.
description: Final, published version
Fabrication, Testing, and Lumped Element Modeling of Planar Heterostructure Barrier Varactors
Creators: name: Saglam, M.
name: Leo, E.
name: Bozzi, M.
name: Perregrini, L.
name: Rodriguez-Gironés, M.
name: Hartnagel, H.L.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: In this paper we present a novel lumped element model of planar InGaAs/InAlAs/AlAs Heterostructure Barrier Varactors (HBVs) on InP substrate. HBVs with 30 and 40 ¹m anode diameters were fabricated as coaxial-type con¯guration to check the wafer quality and extract the intrinsic parameters. Planar HBVs mounted on a coplanar waveguide were fabricated and measured in the 0.5{26.5 GHz frequency range, at di®erent bias points up to 10 V. The measured S-parameters were ¯tted to the proposed equivalent circuit to extract the values of both the parasitic and intrinsic elements. Finally, the extracted equivalent circuit was used to calculate the theoretical tripling e±ciency at 450 GHz attainable with the fabricated HBVs.
A 43-Gbps Lithium Niobate Modulator Driver Module
Creators: name: Virk, R.S.
name: O'Neal, M.
name: Camargo, E.
name: Ragle, R.
name: Notomi, S.
name: Gentrup, M.
name: Franzwa, E.
name: Hicks, G.
name: Fukugawara, T.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: This paper describes the realization of a 43-Gbps Lithium Niobate modulator driver module. The NRZ driver module utilizes four stages of GaAs p-HEMT MMIC amplifiers integrated with an output level detector and feedback loop to provide thermal stability and external control of the output swing. The bias and loop control circuitry are contained in the housing on a PC board external to the sealed MIC section. The integrated module (50.8 x 73.4 x 9.5 mm 3) provides 6.0 Vp-p controllable single-ended output voltage while dissipating only 4 watt.
New Large Signal Model of AlGaAs P-HEMT and GaAs MESFET Under Optical Illumination
Creators: name: Zamanillo, J.M.
name: Navarro, C.
name: Perez-Vega, C.
name: Garcia, J.A.
name: Mediavilla, A.
name: Tazon, A.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2002
Subjects: ING-INF/01 Elettronica

description: As an extension of previous works in the optical-microwave interaction field, this paper shows the results of the research on large signal dynamic behaviour (Pulsed I/V curves) of AlGaAs P-HEMT (pseudomorphic high electron mobility transistor) devices, in the overall I/V plane, when the incident optical input power is changed. A complete bias and optical power dependence of the large signal model for a P-HEMT, is determined from experimental scattering parameters, DC and pulsed measurements. All derivatives of the model shown here are continuous for a realistic description of circuit distortion and intermodulation. The model is also valid for GaAs MESFET. experimental results show very good agreement with theoretical analysis.
A Novel Direct Extraction Method for Internal Equivalent Circuit Parameters of HBT Small-Signal Hybrid-Pi Model
Creators: name: Bousnina, S.
name: Ghannouchi, Fadhel M.
name: Surridge, R.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A novel and accurate method for the direct extraction of HBT small-signal hybrid-Pi model parameters is proposed. The main feature of this method is that a unique set of intrinsic parameters is calculated for the whole frequency range of operation using a least-squares data fitting algorithm. This algorithm consists of an estimation from measured S-parameters of a set of new analytical equations derived from the intrinsic HBT equivalent-circuit Y-parameters. Experimental validation on an HBT device with a 2x25 mm emitter was carried out, and excellent results were obtained up to 30 GHz.
Driving two atoms in an optical cavity into an entangled steady state using engineered decay
Creators: name: Reiter, Florentin
name: Kastoryano, Michael J.
name: Sørensen, Anders S.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We propose various schemes for the dissipative preparation of a maximally entangled steady state of two atoms in an optical cavity. Harnessing the natural decay processes of cavity photon loss and spontaneous emission, we use an effective operator formalism to identify and engineer effective decay processes, which reach an entangled steady state of two atoms as the unique fixed point of the dissipative time evolution. We investigate various aspects that are crucial for the experimental implementation of our schemes in present-day and future cavity quantum electrodynamics systems and analytically derive the optimal parameters, the error scaling and the speed of convergence of our protocols. Our study shows promising performance of our schemes for existing cavity experiments and favorable scaling of fidelity and speed with respect to the cavity parameters.
description: 37 pages, 14 figures
Indigenous struggles for land rights in Canada, Japan and Mexico : Delgamuukw, Nibutani Dam and Zirahuén
Creators: name: Ramirez-Espinosa, Naayeli Esperanza
Publisher: name: University of British Columbia
Year: 2014

description: This dissertation is an interpretive case study of the claims and decisions of three legal cases that were brought to the courts by Indigenous peoples with respect to their constitutional rights. The first is the Delgamuukw case in Canada; the second is the Nibutani Dam case in Japan; and the third is the Zirahuén case in Mexico. Even though, in these three cases, the courts seem to be sympathetic to the pleadings of the Indigenous plaintiffs, they all dismissed, rejected, or left their claims unresolved on procedural grounds. The focus of the study are the procedural standards used by the courts for the review of the plaintiffs’ claims in the three cases and focuses on four themes: 1) the paucity of suitable causes of action to challenge the interventions of the state and third parties by Indigenous communities; 2) the difficulties of proof; 3) the inadequacy of remedies corresponding to the rights established in national and international laws; and 4) legal language and uncertainty regarding the content and reach of the rights of Indigenous peoples in the three jurisdictions. The study also looks at the rationality behind such standards and the courts’ concerns with fairness, coherence and autonomy. This study indicates that the Indigenous plaintiffs’ constitutional claims were extremely difficult to frame within the causes of action available for them. The actions were extremely difficult to use either because there were no causes of action to protect their rights at a proper moment, the causes of action disregarded crucial characteristics of the legal and material realities of the communities, or the causes of action lacked corresponding remedies. These difficulties suggest that there was a redundant tension between the notion of sovereignty that courts used in their decisions and the rights of Indigenous peoples. The analysis also suggests that the plaintiffs’ constitutional rights are conditional to an issue of constitutional power that needs to be resolved.
Beeinflussung des Hirngewebsglucosestoffwechsels und der Glycerolkonzentration im Hirngewebe durch systemische Stoffwechselvariationen - eine explorative klinische Untersuchung mittels Hirngewebsmikrodialyse an Patienten mit einer Subarachnoidalblutung
Creators: name: Langer, Matthias Joachim
Publisher: name: Universitäts- und Landesbibliothek Sachsen-Anhalt
Year: 2005
Subjects: subject: Elektronische Publikation
subject: Hochschulschrift
subject: Online-Publikation
subject: Zsfassung in engl. Sprache
subject: 616.8

description: Hintergrund: Das Ausmaß des endgültigen neurologischen Defizites nach Subarachnoidalblutung (SAB) ergibt sich aus dem sekundären Schaden im weiteren Krankheitsverlauf. Wir untersuchten, ob die systemische Gabe von etabolischwirksamen Medikamenten oder Ernährungssubstraten die Werte im Hirngewebsdialysat beeinflusst. Material und Methode: Bei n=13 Patienten mit SAB wurde im Rahmen der operativen Versorgung ein Mikrodialysekatheter in das Abstromgebiet des betroffenen Gefäßes gelegt. Über den Katheter wurde Glucose, Lactat und Glycerol bestimmt. Gleichzeitig wurde die Katecholaminmenge und die Serumwerte für Triglyceride und Glucose erfasst. Ergebnisse: Es konnte lediglich ein Trend für höhere Glucosewerte im Hirngewebe bei hyperglykämischen Patienten festgestellt werden. Ein Zusammenhang zwischen den Messwerten im Hirngewebe und der Zufuhr von Katecholaminen oder den Serumwerten von Triglyceriden und Glucose konnte nicht festgestellt werden. Bei Patienten, die zusätzlich eine zerebrale Ischämie erlitten hatten, maßen wir signifikant höhere Glycerolwerte im Vergleich zur Kontrollgruppe.
description: Background: the extent of the final neurological deficit after subarachnoidal bleeding (SAB) is the result of the secondary damage in the further course of disease. We analysed if there exists an influence of the systemic supply of metabolic acting drugs or nutritional substrates on the measurements of the brain tissue dialysis. Material and methods: during the operation of the aneurysma we inserted a catheter for microdialysis in the perfusion area of the affected blood vessel at n=13 patients. Afterwards we measured the tissue values of glucose, lactate and glycerol. At the same time we recorded the amount of used catecholamines and the blood results of triglyceride and glucose. Results: Hyperglycemic patients trended non-significantly to higher glucose in brain tissue. We could not find a correlation between brain tissue measurements and the supply of catecholamines, triglycerides or lactate. The tissue glycerol was significantly higher in the subgroup suffering of an additional cerebral ischemia than in the control group.
Ledge Design of InGaP Emitter GaAs Based HBTs
Creators: name: Stevens, K.S.
name: Welser, R.E.
name: Chaplin, M.
name: Lutz, C.R.
name: Pan, N.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A wide range of emitter composition, thickness, and doping is studied via dc current gain measurements on large area GaAs based heterojunction bipolar transistors (HBTs) at both room and elevated temperatures. InGaP emitters offer the widest thickness and doping design window in terms of dc peak current gain, as compared with AlGaAs emitters. Remarkably, a 50 Å InGaP emitter HBT retains 50% gain of a more standard 500 Å emitter device. For state-of-the-art HBTs, a degraded peak gain is argued to be caused by an increased reverse hole injection current (IRHI). In light of previously published results which implicate IRHI as a mechanism for materials limited HBT reliability, we suggest dc current gain measurements on large-area HBTs give meaningful insights into the long term reliability of the structure. Specifically, the wider emitter thickness and doping design window offered by an InGaP emitter HBT could apply to reliability as well as to the demonstrated gain stability.
A straightforward method for determining SiGe HBTs intrinsic elements of hibrid PI and TEE small-signal circuit models for multibias operation
Creators: name: Zamanillo, J.M.
name: García, J.A.
name: Mediavilla, A.
name: Tazón, A.
name: Pérez-Vega, C.
Publisher: name: Alma Mater Studiorum - Università di Bologna
Year: 2000
Subjects: ING-INF/01 Elettronica

description: A new method to simultaneously determine the complete Tee and hybrid Pi equivalent circuit parameters of the SiGe HBT including parasitic intrinsic base resistance, is presented. This approach employs analytically derived expressions and is based on the analysis of measured scattering parameters over an adequate frequency range. This paper shows that a one-to-one correspondence exists between Tee and Pi topologies and very good fit between measured and simulated scattering parameters in the frequency range between 0.05 to 50 GHz is obtained.