121,881 research outputs found
Fig. 2 in New Trematode Collyriclum Faba (Plagiochiida, Collyriclidae) Detected In The Birds Of Uzbekistan
No full textFig. 2. Collyriclum faba (Bremser in Schmalz, 1831), extracted from subcutaneous cysts in an infected individual of Sylvia althaea Hume, 1878.Published as part of Azimov, D. A., Akramova, F. D., Shakarbaev, U. A. & Azimov, N. N., 2021, New Trematode Collyriclum Faba (Plagiochiida, Collyriclidae) Detected In The Birds Of Uzbekistan, pp. 339-342 in Zoodiversity 55 (4) on page 341, DOI: 10.15407/zoo2021.04.339, http://zenodo.org/record/637787
Dual Hierarchy for Gravitational n-body
No full textThe n-body problem is the simulation of pair-wise interactions between n objects. This problem appears in many forms, with the classic example being the modeling of gravitational forces between point masses, necessary for cosmological simulations. Many approximation approaches have been devised to reduce the complexity of this problem.t-SNE is a data visualization method that requires repeatedly solving a variant of the n-body problem. A recent paper (An Efficient Dual-Hierarchy t-SNE Minimization, van de Ruit et. al.) proposes a novel algorithm that outperforms other t-SNE minimization methods on medium-scale datasets. The report proves the viability of a dual-traversal method that uses an embedding tree to emit forces and an independent field tree to collect forces. Because the embedding tree is a Linear-BVH and the field tree is an orthtree built to a fixed depth, the overall algorithm has linear complexity.This thesis demonstrates how the dual-tree approach can be adapted for gravitational n-body simulations. Following this, it measures the performance against similar implementations of other algorithms and shows that while the adapted Dual Hierarchy approach is faster than Barnes-Hut, it is outperformed by the Fast Multipole Method on realistic large-scale cosmological datasets.https://github.com/JacksonCampolattaro/n-body Git repository containing an implementation of the adapted Dual Hierarchy algorithm for Gravitational n-body, as well as implementations of several other common algorithms compared against during benchmarking.Computer Engineerin
A note on mapping class group actions on derived categories
No full textLet Xnbe a cycle of n projective lines and Tn a symplectic torus with n punctures. Using the theory of spherical twists introduced by Seidel and Thomas, the author will define an action of the pure mapping class group of Tn on Db(Coh(Xn)). The motivation comes from homological mirror symmetry for degenerate elliptic curves, which was studied by the author with Treumann and Zaslow
Reactions of n,n-dibromobenzenesulfonamide with alcohols and mercaptans, 1971
No full textN,N-Dibromobenzenesulfonamide reacts with primary alcohols in a 1:2 molar ratio to yield the esters of the alcohols. The reaction is believed to proceed via a free radical mechanism to generate the reac-tive acylbromide species which then reacts with another mole of the alcohol to yield the ester as the final product. Benzyl alcohol and short chain primary alcohols give the corresponding aldehydes as side reactions. NNDBS reacts with secondary alcohols to give ketones and alpha bromoketones. No reaction takes place with tertiary alcohols. N,N-Dibromobenzenesulfonamide reacts with primary, secondary and tertiary mercaptans to yield the disulfide of the mercaptans in each case. When molecular bromine was used as the brominating agent, the alcohols did not react but the corresponding disulfide was obtained from each mercaptan
Experimental investigation into the effect of substrate clamping on the piezoelectric behaviour of thick-film PZT elements
No full textThis paper details an experimental investigation of the clamping effect associated with thick-film piezoelectric elements printed on a substrate. The clamping effect reduces the measured piezoelectric coefficient, d33, of the film. This reduction is due to the influence of the d31 component in the film when a deformation of the structure occurs, by either the direct or indirect piezoelectric effect. Theoretical analysis shows a reduction in the measured d33 of 62%, i.e. a standard bulk lead zirconate titanate (PZT)-5H sample with a manufacturer specified d33 of 593pC/N would fall to 227.8pC/N. To confirm this effect, the d33 coefficients of five thin bulk PZT-5H samples of 220µm thickness were measured before and after their attachment to a metallized 96% alumina substrate. The experimental results show a reduction in d33 of 74% from 529pC/N to 139pC/N. The theoretical analysis was then applied to existing University of Southampton thick-film devices. It is estimated that the measured d33 value of 131pC/N of the thick-film devices is the equivalent of an unconstrained d33 of 345pC/N
On ternary monoid of hypersubstitutions of type ? = (n)
No full textA ternary monoid of hypersubstitutions of type ? = (n) is the set Hyp(n) of all hypersubstitutions of type ? = (n) with a ternary operation which satis es the associative law, and has the identity element ?id . For n = 2 , the idempotent and regular elements, the ideals of submonoids and some algebraic-properties of this monoid were studied by author. In this present paper, we study the algebraic-structural properties of Hyp(n), n > 2 and characterize the idempotent and regular elements. In particular, we describe the relationships between some submonoids of this monoid under the ideal of this submonoids
After seven years in Key West, Florida, author John N. Cole learned to appreciat
No full textAfter seven years in Key West, Florida, author John N. Cole learned to appreciate Maine winters for their beauty and power
Hypergolic ignition by head-on collision of N,N,N',N'-tetramethylethylenediamine and white fuming nitric acid droplets
No full text
Hypergolic ignition by the head-on collision of a smaller N,N,N',N' tetramethylethylenediamine (TMEDA) droplet and a larger white fuming nitric acid (WFNA) droplet was experimentally investigated by using a droplet collision experimental apparatus equipped with a time-resolved shadowgraph, a photodetector and an infrared detector. The investigation was focused on understanding the influence of droplet collision and mixing, which vary with the collisional Weber number (We = 20-220) and the droplet size ratio (Delta = 1.2-2.9) while have a fixed Ohnesorge number (Oh = 2.5x10(-3)), on the hypergolic ignitability and the ignition delay times. The hypergolic ignition was found to critically rely on the heat release from of the liquid-phase reaction of TMEDA and nitric acid, which is subsequent to and enhanced by the effective mixing of the droplets of proper size ratios. Consequently, the ignitability regime nomogram in the We-A space shows that the hypergolic ignition favors small Delta s and large Wes; the ignition delay times tend to decrease with either decreasing Delta, or increasing We, or both. A non-monotonic variation of the ignition delay times with We was observed and attributed to the non-monotonic emergence of jet-like mixing patterns that enhance the droplet mixing and hence the liquid-phase reaction. (C) 2016 The Combustion Institute. Published by Elsevier Inc. All rights reserved.</p
Getting Started as a Medical Teacher in Times of Change
No full textMedical school teaching is a skill that is very often learned on the job. The faculty comprised of researchers and clinicians are expert in many biomedical disciplines, but familiarity with learning theories and pedagogy are usually not included in their knowledge and skill sets. The pressure to see patients and acquire extramural funding leaves little time for faculty to learn how to teach. When coupled with the natural attrition of senior faculty it is necessary to start junior faculty on the correct path to being effective medical educators who are capable of lecturing and facilitating. Institutions cannot afford to have medical educators learn through trial and error. The standards set by the Liaison Committee on Medical Education (LCME) are also creating an urgency to produce competent teachers as quickly as possible. Novice teachers need to be able to use these standards to align their teaching with goals, objectives and the appropriate pedagogy. This article is designed to be a self-directed guide describing some essentials that a newly hired faculty member can quickly use to get started. An institutional faculty development program can then serve to build upon and enrich the experience for the new faculty member.This is the authors' accepted manuscript of the article. The final publication is available at Springer via http://dx.doi.org/doi:10.1007/s40670-014-0098-y.Peer reviewe
Turkmen Language Scholar Pigam Azimov and His Chronological References
No full textTürkmen Türkçesi üzerine yapılan bilimsel çalışmaların tarihi 19. yüzyılın ikinci yarısına kadar gitmektedir. Türkmenistan’da Türkmen edebî dilinin araştırılması tarihi, 1917 Ekim Devrimi’nden önce ve sonra olmak üzere iki dönemde ele alınmaktadır. Türkmen Türkçesinin Ekim Devrimi’nden önceki dönemde A. Starçevski, P. Şimkeviç, S. A. Ağabekov, A. B. Alıyev, İ. A. Belyayev ve A. N. Samoyloviç’in yaptığı çalışmalar bulunmaktadır Ekim Devrimi’nden sonraki dönemde ise A. P. Potseluyevki, N. A. Baskakov, A. N. Kononov, V. N. Filyuşina, O. Vepayev, M. Geldiyev, K. Böriyev, G. Sopıyev, H. Deryayev, M. Hıdırov, P. Azımov, H. Baylıyev, M. Ya. Hamzayev, A. Gurbanov, G. Sarıyev, C. Amansarıyev, S. Kürenov, M. Atacanov, B. Çarıyarov, T. Täçmıradov, R. Berdiyev gibi âlimler çalışmalar yapmışlardır. Ekim Devrimi’nden sonraki dönemde Türkmen Sovyet dil bilimi alanında Türkmen dilcisi Pıgam Azımov’un çalışmaları dikkate değerdir. Pıgam Azımov, Türkmenistan’da Sovyet döneminde yetişmiş ve Türkmen dili üzerine çalışmalar yapmış Türkmen âlimlerden biridir. Azımov, Türkmenistan’da dilciliğinin kurulması ve geliştirilmesinde önemli rol oynamış bir akademisyendir. Azımov, Moskova’daki Sovyet Bilimler Akademisinin Şarkiyat Enstitüsünden “filoloji ilimleri doktoru” unvanını alan ilk Türkmen dilcisidir. Azımov’un, Türkmen dili üzerine bilimsel çalışmalar yapması yanında, filoloji alanında millî kadroların yetiştirilmesi, Türkmen dili ve edebiyatı için standart okul kitaplarının yazılması yolunda emekleri büyüktür. Azımov, Türkmenistan’da 1936 yılında düzenlenen 1. Lengüistik Kurultayı’ndan itibaren bilimsel faaliyetler içinde bulunmuş, 1994’te elim bir trafik kazasındaki vefatına kadar Türkmen edebî dili, alfabesi, kısaltmalar, yazım kuralları, sentaksı, morfolojisi, leksikolojisi, ağızları, Türkmen dilinin meseleleri, Türkmen dilcileri ve Türkmen edebiyatı gibi birçok konuda çalışmalar yapmıştır. Azımov aynı zamanda Türk Dil Kurumunun muhabir üyeliğini de yapmıştır.Bu çalışmada meşhur Türkmen dilcisi Pıgam Azımov’un hayatı (1915-1994) ve onun Türkmen Türkçesi üzerine yaptığı çalışmaların kronolojik kaynakçası verilecektir. Kaynakça için Pıgam Azımov hakkında Türkmenistan’da 1990 yılında Soltanşa Atanıyazov tarafından yayımlanan Pıgam Azımov - Biyobibliyografiya kitabı kullanılmıştır. Çalışmamızdaki kaynakçaya Azımov’un yalnız Türkmen dili ve edebiyatıyla ilgili çalışmaları alınmıştır. Çünkü P. Azımov akademisyen olmasının yanı sıra eğitimci, idareci ve teşkilatçı olduğu için yararlanılan kaynakta onun bu alanlarla ilgili çalışmaları da bulunmaktadır. Çalışmanın Türkmenceyle ilgilenen araştırmacılara faydalı olacağı kanaatindeyiz.The history of scientific studies on Turkmen Turkish dates back to the second half of the 19th century. The study of the Turkmen literary language in Turkmenistan is discussed in two periods: before and after the 1917 October Revolution. The period before the October Revolution includes Starchevsky, Shimkevic, Ağabekov, Aliyev, Belyayev, and Samoylovich. After the October Revolution, scholars such as Potseluyevski, Baskakov, Kononov, Filyushina, Vepayev, Geldiyev, Boriyev, Sopiyev, Deryayev, Khidirov, Azimov, Bayliyev, Hamzayev, Gurbanov, Sariyev, Amansariyev, Kurenov, Atacanov, Chariyarov, Tachmiradov, Berdiyev etc. conducted studies.The contributions of the Turkmen linguist Pigam Azimov in Turkmen Soviet linguistics are notable for the post-October Revolution period. Pigam Azimov is one of the Turkmen scholars who grew up in Turkmenistan during the Soviet period and dealt with the Turkmen language. He was a key figure in the growth and establishment of linguistics in Turkmenistan. Azimov was the first Turkmen linguist to receive the title of "doctor of philological sciences" from the Oriental Institute of the Soviet Academy of Sciences in Moscow. Azimov not only carried out scientific studies on the Turkmen language but also made efforts to train national philologists and to write standard textbooks for the Turkmen language and literature.Azimov, who had been involved in scientific activities since the 1st Linguistic Congress held in Turkmenistan in 1936, passed away in a tragic traffic accident in 1994. During this period, he worked on many subjects such as the Turkmen literary language, alphabet and abbreviations, as well as spelling rules, syntax, morphology, lexicology, and dialects of the Turkmen Language. He also focused on the issues of the Turkmen language, Turkmen linguists, and Turkmen literature. Azimov was also a correspondent member of the Turkish Language Association. This paper focuses on the life of the famous Turkmen linguist Pigam Azimov (1915-1994) and the chronological bibliography of his studies on Turkmen Turkish. The study is based on the book titled “Pıgam Azimov – Biobibliography” published by Soltansha Ataniyazov in Turkmenistan in 1990. P. Azimov was not only a scholar but also an educator, administrator, and founder, so the resource also includes his contributions in these areas. However, this article only deals with Azimov's works on Turkmen language and literature. We believe that this study will be useful to researchers working on Turkmen Turkish
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