110 research outputs found
RETRACTED ARTICLE: Effects of dexamethasone on foetal Doppler flow velocimetry
No full textWe, the Editor and Publisher of Journal of Obstetrics and Gynaecology, have retracted the following article: Ahmed M. Nofal, Tarek M. Sayyed, Hesham S. Mahmoud & Tamer Y. Atia (2021). Effects of dexamethasone on foetal Doppler flow velocimetry. Journal of Obstetrics and Gynaecology, 41 (3), 390–394. DOI: 10.1080/01443615.2020.1742677. Since publication, significant concerns have been raised about the statistical analysis in the article. When approached for an explanation, the authors fully cooperated and provided their data, but they have not sufficiently addressed the concerns raised, and concerns remain about the statistical methods in the article. As verifying the validity of published work is core to the integrity of the scholarly record, we are therefore retracting the article. The corresponding author listed in this publication has been informed. The authors do not agree with the retraction. We have been informed in our decision-making by our policy on publishing ethics and integrity and the COPE guidelines. The retracted article will remain online to maintain the scholarly record, but it will be digitally watermarked on each page as ‘Retracted’
Investigation of the carbon produced by methane pulsed discharge
No full text6th International Conference of the Balkan-Physical-Union -- AUG 22-26, 2006 -- Istanbul, TURKEYWOS: 000246647900406In this paper, we report the new production method amorphous carbon grown on sharpened tungsten electrode at atmospheric pressure by using high voltage pulsed methane discharge.Balkan Phys Union, Turkish Phys Soc, Istanbul Univ, Yildiz Tech Univ, Bogaz Univ, Dogus Univ, European Phys Soc, Govt Istanbul, Istanbul Metropolitan Municipal, Turkish Atomic Energy Author, Sci & Technol Res Council Turkey, United Natl Educ Sci & Cultutal Org, NEL ElectronikScientific Research Committee of ESKISEHIR OSMANGAZI UNIVERSITY [200319009]This research activity was supported by the Scientific Research Committee of ESKISEHIR OSMANGAZI UNIVERSITY (project number of 200319009). Present research has been realized in the frame of cooperation agreement between National Institute for Laser Plasma and Radiation Physics Bucharest, Romania and Ovidius University Constanta, Romania and Eskisehir Osmangazi University Eskisehir, Tiirkiye
On Bassian and generalized Bassian modules
No full textA right R-module M is called (generalized) Bassian if the existence of an injective homomorphism M -> M/N for some submodule N of M implies that N = {0} (N is a direct summand of M). We partially describe relationships between the classes of Bassian and generalized Bassian modules. In particular, we show that generalized Bassian abelian groups are precisely direct sums of Bassian and semisimple abelian groups, which is a positive answer for Conjecture 1.3 in [P. V. Danchev and P. W. Keef, Generalized Bassian and other mixed abelian groups with bounded p-torsion, J. Algebra 663(1) (2025) 1-19].IISER BerhampurWe sincerely thank the reviewer for their thoughtful, encouraging, and detailedfeedback, which we found both valuable and motivating. The first-named author is thankful to IISER Berhampur for providing facilities to carry out this work with a Postdoctoral Fellowship
Biological Testing and Toxicity Bioassays in Biodegradation: Toward Better Process Control
No full textBiofilm formation in enterococci: Genotype-phenotype correlations and inhibition by vancomycin
No full text© 2017 The Author(s). Enterococci are nosocomial pathogens that can form biofilms, which contribute to their virulence and antibiotic resistance. Although many genes involved in biofilm formation have been defined, their distribution among enterococci has not been comprehensively studied on a genome scale, and their diagnostic ability to predict biofilm phenotypes is not fully established. Here, we assessed the biofilm-forming ability of 90 enterococcal clinical isolates. Major patterns of virulence gene distribution in enterococcal genomes were identified, and the differentiating virulence genes were screened by polymerase chain reaction (PCR) in 31 of the clinical isolates. We found that detection of gelE in Enterococcus faecalis is not sufficient to predict gelatinase activity unless fsrAB, or fsrB alone, is PCR-positive (P = 0.0026 and 0.0012, respectively). We also found that agg is significantly enriched in isolates with medium and strong biofilm formation ability (P = 0.0026). Additionally, vancomycin, applied at sub minimal inhibitory concentrations, inhibited biofilm in four out of five strong biofilm-forming isolates. In conclusion, we suggest using agg and fsrB genes, together with the previously established gelE, for better prediction of biofilm strength and gelatinase activity, respectively. Future studies should explore the mechanism of biofilm inhibition by vancomycin and its possible use for antivirulence therapy
GHz half wavelength contact acoustic microscopy (HaWaCAM): A feasibility study
No full textThe semiconductor industry needs to fit ever more devices per unit area to improve their performance; hence a trend towards increasingly complex structures by varying material combinations and 3D geometries with increasing aspect ratios. The new materials used may be optically opaque, posing problems for traditional optical metrology methods. One solution is to use acoustical waves, which present the double advantage of not being hampered by optically opaque layers and allowing for penetration depths of 10's of μm at sub-μm wavelengths; which is considerably larger than most traditional optical methods (O(100 nm's - μm's)). Here, we present a novel acoustic metrology method using GHz ultrasound waves to measure deeply buried subsurface features (>5 μm). The concept consisted of a GHz acoustic transducer integrated above the tip of a custom designed probe, which is then scanned across a sample. The method uses non-damaging solid-solid contact without the need for liquid coupling layers - in contrast to conventional acoustical microscopy. This allows for the use of much higher acoustic frequencies, hence higher on-axis resolutions. The transducer is used in pulse-echo mode and a stage controller is used to move the probe for scanning. An experimental setup was built with a 4 GHz transducer and tested successfully on 1.5-2 μm size features buried below a 5 μm PMMA or 10 μm SiO2layer, respectively. A good match was further obtained between the measurements and the model predictions. These results demonstrated the feasibility of the new method, opening new opportunities for metrology and inspection applications.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.ImPhys/Medical Imagin
Corylus chinensis Franch.
No full text3. Corylus chinensis Franch. Journal de Botanique (Morot) 13: 197 (Franchet 1899). – C. colurna var. chinensis (Franch.) Burkill, The Journal of the Linnean Society. Botany 26: 503 (Burkill 1899). – Original citation: “ China occidentalis, provincia Yunnan, in silvis montanis faucium ad San thang kiou, in via e Tali ad Ho kin, alt. 2200 m (Delavey, nn. 197 et 212)”. – Type: China, Yunnan, San Tchang Kiou, Ho Kin, 2200 m a.s.l., 27 Aug. 1884, J.M. Delavay 197 [P212] (lecto-, designated here: P06811315!; isolecto-: B 10 0464027!, P06811316!, P06811317!, P06811318!, P06811319!, P06811320!, P06811321!, P06811335!, P06881735!). – Note: Corylus chinensis is recognized in the Flora of China (Li & Skvortsov 1999), Flora Sichuanica (Editorial Board of the Flora Sichuanica 2012), and World Checklist and Bibliography of Fagales (Govaerts & Frodin 1998). The specimen chosen as a lectotype here bears two numbers: “no. 197” (with the number circled) and “no. 212.” There are different numbering systems in Delavay’s collections (Holstein & Weigend 2016a), and the 197 is Delavay’s original number. The number “212” is apparently the specimen number placed on the sheet at the Paris herbarium, which is also found on specimen P06811321. C. papyracea Hickel, Bulletin de la Société Dendrologique de France 68: 94 (Hickel 1928). – Type: Cult. in Frutic. Vilmorinianum olim. cult., R. Hickel s.n. (lecto-, designated here: P06811311!). – Additional original material: Cult. in Frutic. Vilmorinian., Sep. 1910, R. Hickel s.n. (P06811310!). – Note: Corylus papyracea is listed as a synonym of C. chinensis in the Flora of China (Li & Skvortsov 1999), in the Flora Sichuanica (Editorial Board of the Flora Sichuanica 2012), and in the World Checklist and Bibliography of Fagales (Govaerts & Frodin 1998). The material for the description of this “species” was only observed in cultivation and according to the author, it already had disappeared 10 years before publication. Hickel mentions that Vilmorin believed that the seeds were from China and had been originally collected by P.G. Farges in 1904. The lectotype was chosen because the upper right leaf is the one shown in the illustration accompanying the protologue. The other specimen bears the unpublished name “ Corylus papyrifera ”, but does not differ from the lectotype. Possibly, that name was a working name. C. chinensis var. macrocarpa Hu, Bulletin of the Fan Memorial Institute of Biology, Botany 8: 32 (Hu 1937). – Type: China, Yunnan, Wai-Si Hsien, Yeh Chih wa-rung, 3400 m a.s.l., Aug. 1935, C.W. Wang 68308 (holo-: PE00802441!; iso-: A00033779!, PE00802422!, PE00802446!, PE00802445!, PE00802439!, PE00802430!). – Note: Corylus chinensis var. macrocarpa is listed as a synonym of C. chinensis in the Flora of China (Li & Skvortsov 1999), Flora Sichuanica (Editorial Board of the Flora Sichuanica 2012), and World Checklist and Bibliography of Fagales (Govaerts & Frodin 1998).Published as part of Holstein, Norbert, Tamer, Sarah el & Weigend, Maximilian, 2018, The nutty world of hazel names - a critical taxonomic checklist of the genus Corylus (Betulaceae), pp. 1-45 in European Journal of Taxonomy 409 on pages 16-17, DOI: 10.5852/ejt.2018.409, http://zenodo.org/record/378716
Guidance, control and estimation of autonomous vehicle systems
No full textThis research focuses on designing practical guidance, control and estimation algorithms for autonomous vehicle systems. The objective is to provide robust control
and estimation algorithms for both single and multiple autonomous vehicles under realistic motion, sensing, and communication conditions such as uncertain
dynamics, passive sensor, limited communication range, and the complicated coupling among them.
With that objective in mind, we start with designing vision-based guidance and estimation algorithms for small unmanned air vehicles (UAVs) to track a ground
target. The tracking task is for the UAV to maintain a horizontal orbit around the target with a predefined radius, so as to provide continuous visual surveillance
of the target with a desired resolution. We design simple vision-based guidance laws for the cases of both static target and moving target by controlling only the
turn rate of the UAV, and give rigorous proofs of the “almost global” asymptotic stability of the closed-loop systems. We extend the tracking algorithm for a single
UAV to the case of coordinated target tracking with multiple UAVs by controlling only the turn rates, where, in addition to orbiting about the target, each UAV is
required to maintain given phase differences from others. In order to provide continuous estimates of the target’s motion, including its position, velocity, and
heading angle, we formulate an estimation problem in a deterministic setup such that the recently developed fast estimator can be applied which yields guaranteed
transient performance.
The second part of this thesis is dedicated to the topic of distributed control of a group of unmanned vehicles, in the presence of realistic dynamical, sensing and
communication constraints. The objective is to drive a group of unmanned vehicles with uncertain dynamics from different initial conditions to aggregate towards
a moving target of interest and align their velocities with it, resulting in a moving flock. We develop a cascaded control framework to decouple the inter-agent
coordination from local uncertainty compensation for each single agent, such that existing algorithms in literature designed for simple ideal agent kinematics can be
used as the outer-loop, while L1 adaptive controllers are used for the inner-loop. Two different ideal agent model are considered, namely, the double integrator and
the nonholonomic model.
To better handle the uncertainty compensation under limited computation and sensing capability, which is a quite common case for cheap and small autonomous
vehicles, we develop a new L1 adaptive controller in the third part of this thesis. It features a modified piecewise constant adaptive law that imposes significantly
less stringent requirements on the computation and sensing frequencies. The main idea is to more efficiently exploit the information of the uncertainties from the
past samples and use this information to compensate for the uncertainty in the next sample period. We compare the performance and robustness trade-off of the
new and the existing L1 adaptive controllers.Item withdrawn by Laura Spradlin ([email protected]) on 2013-12-04T17:53:15Z
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The action for removal of copyright infringement to intellectual and artistic works
No full textTürk hukuk literatürü incelendiğinde, fikri hukuk bağlamında tecavüz kavramı ve tecavüzün niteliğiyle birlikte, mali ve manevi haklara tecavüze karşı bir koruma sağlayan tecavüzün ref'i davasını ele alan çalışmalar az sayıda bulunmaktadır. Çalışmamızın genel muhtevasını FSEK m. 66-68 hükümleri arasında düzenlenen tecavüzün ref'i davası teşkil edip, tecavüzün men'i davası (FSEK m. 69) ve tazminat davasına (FSEK m. 70) yer yer değinilse de, söz konusu bu hukuk davaları kapsam dışı tutulmuştur. Bu bağlamda, genel olarak eser kavramı, eser sahipliği, eser sahibinin hakları incelenmiş (birinci bölüm), fikri hukuk bağlamında tecavüz kavramı ve tecavüzün hukuki niteliği ortaya konulmuş, FSEK sistematiğine uygun olarak manevi ve mali haklara tecavüz halleri ile tecavüzü ortadan kaldıran haller yargı kararları ve öğretideki görüşler çerçevesinde irdelenmiş (ikinci bölüm), son olarak da tecavüzün ref'i davası incelenerek, tecavüzün ref'i davasının açılma koşulları, davanın tarafları, görevli ve yetkili mahkeme ile zamanaşımı konularına değinilmiş; tecavüzün ref'i davası kapsamında ileri sürülebilen talepler, özellikle üç kat bedel talebi tüm yönleriyle ve rekabet hukuku ile mukayeseli olarak ele alınmıştır (üçüncü bölüm).When Turkish Legal literaturere searched, it is seen that there are slightly few studies devoted to the notion and quality of copyright infringement in the context of intellectual rights and the action for removal of copyright infringement which ensures protection against the infringement of economic and moral rights. In order to fill this deficiency, the issue of this study is about the action for removal of copyright infringement. This study analyzes the action for removal of copyright infringement enacted in FSEK article 66 -68. Although the action for prohibition of infringement (FSEK Article 69) and the action for damages (FSEK Article 70) are mentioned briefly, the seactions are out of scope. In this regard the notion of work, authorship and the rights of author are analyzed (chapter one), the notion of copyright infringement and the legal characteristics of copyright infringement are set forth in the context of intellectual rights. The conditions for infringement of moral and economic rights and the conditions removing infringement are studied in the frame of judicial and doctrinal decisions in accordance with FSEK (chapter two), finally the action for removal of copyright infringement is analyzed conceptually, the conditions of bringing action for removal of copyright infringement, parties of action, component court, and lapse of time issues are handled; demands that can be asserted in the context of action for removal of copyright infringement and treble damages are handled in all parts and comparative with competition law (chapter three)
Influence of nanoparticles addition on the fatigue failure behavior of metal matrix composites : Comprehensive review
No full textAbstractLight-weight, high-strength metal matrix composites (MMCs) have been gaining prominence in various industrial applications in which the materials are exposed to static and dynamic loading conditions. Unfortunately, micron-sized MMCs frequently encounter challenges such as particle breakage and debonding at the reinforcement-matrix interface, resulting in premature failure due to the decline in their mechanical properties, making them impractical to be utilized in some crucial applications. On the other hand, metal matrix nanocomposites (MMNCs) have been proven to improve strength, ductility, and fracture toughness characteristics, which are greatly beneficial in various industrial applications such as automotive, aerospace structures, and biomaterials. This review provides a comprehensive insight into the effect of nanoparticle addition on the fatigue performance of metals and alloys. Firstly, special attention has been given to the factors influencing the fatigue life of MMNCs. Secondly, the effect of nanoparticle incorporation on the fatigue performance of common metal matrixes, including aluminum, magnesium, titanium, and steel alloys, is reviewed in detail. Finally, a summary of this review and the future aspects related to the behavior of metals with nanoparticles at cyclic loading is provided.Abstract
Light-weight, high-strength metal matrix composites (MMCs) have been gaining prominence in various industrial applications in which the materials are exposed to static and dynamic loading conditions. Unfortunately, micron-sized MMCs frequently encounter challenges such as particle breakage and debonding at the reinforcement-matrix interface, resulting in premature failure due to the decline in their mechanical properties, making them impractical to be utilized in some crucial applications. On the other hand, metal matrix nanocomposites (MMNCs) have been proven to improve strength, ductility, and fracture toughness characteristics, which are greatly beneficial in various industrial applications such as automotive, aerospace structures, and biomaterials. This review provides a comprehensive insight into the effect of nanoparticle addition on the fatigue performance of metals and alloys. Firstly, special attention has been given to the factors influencing the fatigue life of MMNCs. Secondly, the effect of nanoparticle incorporation on the fatigue performance of common metal matrixes, including aluminum, magnesium, titanium, and steel alloys, is reviewed in detail. Finally, a summary of this review and the future aspects related to the behavior of metals with nanoparticles at cyclic loading is provided
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