1,290 research outputs found
Entrainment studies in cloud-like flows using novel scanning tomography technique
No full textClouds are one of the major sources of uncertainty in climate prediction.The present work is to study the dynamics of orographic clouds. We considered a planar turbulent wall jet with off source volumetric heating as an appropriate low order fluid-dynamical model for studying the turbulence and entrainment in orographic-clouds. Entrainment was found to reduce drastically with the off-source volumetric heat addition. We found that the reduction of entrainment started at a bulk-Richardson number which was an order of magnitude smaller than that seen in earlier experiments [1] on free standing cumulus clouds. This is consistent with observations in real orographic clouds which develop as a thin sheet rising along the mountain slope. We have developed a novel scanning tomography technique for getting concentration field in turbulent shear flows. This technique is being applied on cloud-like flow to understand the entrainment characteristics. Detailed results will be presented at the conference
Voice Compression and Communications: Principles and Applications for Fixes and Wireless Channels
No full textUp-to-date, expert coverage of topics in wireless voice communications Voice communication is the most important facet of mobile radio service. Even when the predicted surge of wireless data and Internet services becomes a reality, voice will remain the most natural means of human communication. Voice Compression and Communications details issues in wireless voice communications and treats compression, channel coding, and wireless transmission as a joint subject. Part I covers background material, whereas Part II provides detailed information on both proprietary and standardized analysis-by-synthesis codecs, including the speech codecs of virtually all existing wireline-based and wireless systems. Parts III and IV discuss mainly research-based wideband, audio, as well as very low-rate schemes likely to find their way into future standards. Voice Compression and Communications describes fundamental concepts in a non-mathematical way early in the book for those with only a background knowledge of signal processing and communications. More advanced readers will find detailed discussions of theoretical principles, future concepts, and solutions to various specific wireless voice communications problems
Collaboration and interconnectivity: Nottinghamshire Fire and Rescue Services and higher education institutions in Nottingham
No full textThis paper will describe the developing relationship between Nottinghamshire Fire and Rescue Services and the two Higher Education Institutions in Nottingham. It will chronicle how a very traditional relationship has been transformed, initially by a simple consultancy project, into a much closer working relationship characterised by a much richer variety of collaborative projects. It demonstrates the potential mutual benefits that greater trust and reciprocity between the institutions can bring to both academia and to practice and the impact it has already had on curriculum development, teaching and learning in Nottingham
Current treatment modalities for certain urogenital infections in pregnancy
No full text
K.R. Bondarenko, Yu.E. Dobrokhotova
Pirogov Russian National Research Medical University, Moscow, Russian Federation
This article critically reviews paradigm shift in obstetrics over the last three decades regarding the diagnosis and treatment of some infections of female reproductive system during pregnancy. Screening algorithms and treatment approaches to vulvovaginal candidiasis and asymptomatic bacteriuria in the course of gestation approved by clinical protocols worldwide are compared. The article provides the basis for topical application of 2% clotrimazole cream in pregnant women with manifest vulvovaginal candidiasis or asymptomatic vaginal colonization with Candida spp. Novel findings demonstrate that this treatment potentially reduces the rate of preterm birth. Despite conflicting views on the screening for infections in pregnancy, the author argues the tests for asymptomatic bacteriuria after week 14 of pregnancy to prevent severe infections of the upper and lower urinary system and to reduce the risk of preterm birth. 3 g of per os fosfomycin trometalol (Fosfomycin Esparma) is re commended as the first-line choice for asymptomatic bacteriuria in pregnancy. This medication meets the requirements for drug safety and efficacy.
Keywords: pregnancy, preterm birth, vulvovaginal candidiasis, urinary infections, asymptomatic bacteriuria, clotrimazole, fosfomycin trometalol.
For citation: Bondarenko K.R., Dobrokhotova Yu.E. Current treatment modalities for certain urogenital infections in pregnancy. Russian Journal of Woman and Child Health. 2019;2(3):168–172.
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Aspects of self-adaptive control using parameter perturbation techniques
No full textThis thesis is concerned with the performance of a method of simultaneous identification and optimization of a control system, employing a parameter perturbation technique.
The work is divided into four parts:
(i) The evaluation of several techniques for the identification and gain-estimation of plants having one "input" and one "output", in the presence of noise, where the "input is a controllable parameter, and the "output" is a criterion of the cost of the plant, which is some function of the plant variables. The slope of the cost-function is then given by the "gain" of the plant.
(ii) The optimization of plants having more than one dynamic path between input and output.
(iii) The optimization of multi-parameter plants.
(iv) A general consideration of optimization strategies.
The first part of the thesis is based on the well known
technique of obtaining the step response of a plant by applying a pseudo-random binary sequence (or "chain code") at the input, crosscorrelating this with the output, and integrating. A technique equivalent to this, using a multiplier and running-averager, is analysed, and it is shown that significant errors can be caused by any
d.c. -- bias inherent in the plant output. The performance of the system when band-limited noise is present at the output of the plant is determined, and it is found that if the parameters of the identification process are chosen so as to reduce the variance of the gain-estimate to a minimum, the error due to d.c.-bias may be large. Practical results are given, which support the theory.
An alternative scheme is considered which enables the d.c. error to be effectively removed. Various methods of implementing this scheme in practice are proposed for use with and without a digital process-control computer. The scheme is analysed under the same noise conditions as before. The signal and noise components of the gain-estimate are evaluated in terms of the parameters of the system, and a design procedure for the choice of optimal values for these parameters is formulated. A method of gain-estimation using sine-wave perturbations is then analysed under similar noise conditions, and compared with the chain-code method.
The second part of the work is devoted to the optimization of plants having more than one dynamic path between input and output, with a different cost-function in each path. It is shown that the estimated position of the optimum varies with perturbation frequency when using sine-wave perturbation, or chain-codes. The theory is supported by the experimental analysis of a simplified model based on a steam-generating plant.
In the third part, various methods of identification of multichannel plants are considered, based on the use of chain-codes. The extent of cross-coupling between channels is examined, and ways of reducing this are evaluated. It is found that the best solution is to use time-shifted versions of the same chain-code, applied to the different inputs of the plant. Practical methods of implementing this are discussed, and a multi-channel optimization program is built up for use with an on-line digital computer. The performance of this program is evaluated for a four-parameter system simulated on an analog computer, with and without compensation for the effect that previous changes in parameter have on the estimate of the gradient of the cost-function.
In the last part of the thesis, the basic limitations on speed of optimization are investigated. Various strategies for rapid hill-climbing are discussed, and a technique for minimizing the number of optimization steps is developed
K.R. Popper’s critical rationalism
No full textAccording to the author, Popper’s critical rationalism can be seen as critical
theory and gnoseology of human cognition. Cognition, which is not the
goal, and instrument by which we can know the conditions of our lives
Effects of hydrodynamic and chemical/osmotic stress on plant cells in a stirred bioreactor
No full textApplied Science
Archaeological excavations in Phanagoria in 1852-1855 (based on an excavation journal of Begichev K.R.)
No full textИстория археологического изучения Фанагории насчитывает уже более двух столетий и изобилует неизвестными широкому кругу исследователей подробностями. Так, долгое время считался утраченным полевой дневник К.Р. Бегичева, в который исследователь заносил информацию о своих раскопках на территории Керченского и Таманского полуостровов в 1852-1855 гг. Относительно недавно подлинник дневника был найден в Архиве Керченского музея. В настоящее время этот документ готовится к публикации и недоступен для исследователей. В 2012 г. в Научно-ведомственном архиве ГИМа автором была обнаружена копия фрагмента дневника К.Р. Бегичева о раскопках городища и некрополей Фанагории. Эта копия была сделана в 1927-1928 гг. сотрудниками исследовательской группы Л.П. Харко в рамках возобновления археологического исследования «столицы» Азиатского Боспора. Поскольку под руководством К.Р. Бегичева были впервые предприняты раскопки городища и открыты уникальные погребальные комплексы, то информация из его полевого дневника представляется крайне важной для отечественного боспороведения.Історія археологічного вивчення Фанагорії нараховує вже більш двох століть та рясніє невідомими широкому колу дослідників подробицями. Так, довгий час вважався втраченим польовий щоденник К.Р. Бегічева, в який дослідник вносив інформацію про свої розкопи на території Керченського та Таманського півостровів у 1852 - 1855 рр. Відносно недавно оригінал щоденника був знайдений у Архіві Керченського музею. Нині цей документ готується до публікації та недоступний для дослідників. У 2012 р. у Науково-відомчому архіві ГІМу автором була виявлена копія фрагменту щоденника К.Р. Бегічева про розкопи городища та некрополів Фанагорії. Ця копія була зроблена у 1927-1928 рр. співробітниками дослідницької групи Л.П. Харко в рамках відновлення археологічного дослідження «столиці» Азіатського Боспору. Оскільки під керівництвом К.Р. Бегічева були вперше вжиті розкопи городища та відкриті унікальні похоронні комплекси, інформація з його польового щоденника представляється вкрай важливою для вітчизняного боспорознавства.The history of archaeological research of Phanagoria has more than two centuries and abounds details unknown to a wide range of researchers. So, a great while an excavation journal of Begichev K.R., in which the scientists recorded information about his excavations in the Kerch and Taman peninsulas in 1882-1855, was considered to have been lost. Relatively recently, the original journal has been found in the archives of the Kerch Museum. Currently, this document is being prepared for publication and is not available to researchers. In 2012, the author found a copy of a fragment of Begichev’s journal on excavation of the settlement and necropoleis of Phanagoria in the Scientific and departmental archives of the State Historical Museum. This copy was made in 1927-1928 by members of the research group of Kharco L.P., under renewed archaeological research the «capitals» of the Asian Bosporus. As Begichev K.R. made his first attempts to excavate the settlement and discovered unique funerary complexes, the information of his excavation journal is extremely important for the domestic studies of the Bosporus
Des données numériques aux connaissances pluridisciplinaires : enjeux de documentation et de formalisation
No full textContributeurs : Violette Abergel, Pierre Arese, Florent Comte, Iwona Dudek, Anaïs Guillem, Antoine Gros, Kévin Réby, Livio De Luca, Aurore Pfitzmann, Pascal Bénistant //Author contributions : Conceptualization: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.; Data curation: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.; Formal analysis: ; Funding acquisition: L.D.L.; Investigation: ; Methodology: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.; Project administration: L.D.L., A.P.; Resources: P.B.; Software: ; Supervision: L.D.L.; Validation: L.D.L.; Visualization: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.; Writing – original draft: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.; Writing – review & editing: V.A., P.A., F.C., I.D., A.Gu., A.Gr., K.R.International audiencePrésentation des procédés de gestion et de structuration des données acquises lors du Chantier Scientifique de Notre-Dame de Pari
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