Academic literature on the topic 'Group F(2'
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Journal articles on the topic "Group F(2"
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Akhmedov, Azer, Melanie Stein, and Jennifer Taback. "Free limits of Thompson’s group F." Geometriae Dedicata 155, no. 1 (2011): 163–76. http://dx.doi.org/10.1007/s10711-011-9583-2.
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KOBERDA, THOMAS, and YASH LODHA. "2-chains and square roots of Thompson’s group." Ergodic Theory and Dynamical Systems 40, no. 9 (2019): 2515–32. http://dx.doi.org/10.1017/etds.2019.14.
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We study 2-generated subgroups $\langle f,g\rangle <\operatorname{Homeo}^{+}(I)$ such that $\langle f^{2},g^{2}\rangle$ is isomorphic to Thompson’s group $F$, and such that the supports of $f$ and $g$ form a chain of two intervals. We show that this class contains uncountably many isomorphism types. These include examples with non-abelian free subgroups, examples which do not admit faithful actions by $C^{2}$ diffeomorphisms on 1-manifolds, examples which do not admit faithful actions by $PL$ homeomorphisms on an interval, and examples which are not finitely presented. We thus answer questions due to Brin. We also show that many relatively uncomplicated groups of homeomorphisms can have very complicated square roots, thus establishing the behavior of square roots of $F$ as part of a general phenomenon among subgroups of $\operatorname{Homeo}^{+}(I)$.
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BAMBERG, JOHN, SAUL D. FREEDMAN, and LUKE MORGAN. "ON -GROUPS WITH AUTOMORPHISM GROUPS RELATED TO THE CHEVALLEY GROUP." Journal of the Australian Mathematical Society 108, no. 3 (2020): 321–31. http://dx.doi.org/10.1017/s1446788719000466.
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Let $p$ be an odd prime. We construct a $p$-group $P$ of nilpotency class two, rank seven and exponent $p$, such that $\text{Aut}(P)$ induces $N_{\text{GL}(7,p)}(G_{2}(p))=Z(\text{GL}(7,p))G_{2}(p)$ on the Frattini quotient $P/\unicode[STIX]{x1D6F7}(P)$. The constructed group $P$ is the smallest $p$-group with these properties, having order $p^{14}$, and when $p=3$ our construction gives two nonisomorphic $p$-groups. To show that $P$ satisfies the specified properties, we study the action of $G_{2}(q)$ on the octonion algebra over $\mathbb{F}_{q}$, for each power $q$ of $p$, and explore the reducibility of the exterior square of each irreducible seven-dimensional $\mathbb{F}_{q}[G_{2}(q)]$-module.
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Fiore, Marcelo, and Tom Leinster. "An abstract characterization of Thompson’s group F." Semigroup Forum 80, no. 2 (2010): 325–40. http://dx.doi.org/10.1007/s00233-010-9209-2.
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Chaudhry, Humayun J., Paul E. Schoch, and Burke A. Cunha. "Flavimonas oryzihabitans (CDC Group Ve-2)." Infection Control & Hospital Epidemiology 13, no. 8 (1992): 485–88. http://dx.doi.org/10.1086/646578.
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Flavimonas oryzihabitansis an uncommon organism with distinctive microbiological and biochemical features that is infrequently isolated from humans. The presence of foreign material, including indwelling intravascular catheters and artificial grafts, or various surgical procedures appear to predispose patients with underlying disease to bacteremic infection withFlavimonas. A gram-negative bacillus,F oryzihabitansis sensitive to most antibiotics except first- and second-generation cephalosporins.F oryzihabitansisolated from blood should be considered pathogenic in patients with indwelling catheters or prosthetic materials.Previously designatedPseudomonas oryzihabitansand also known as Centers for Disease Control (CDC) Group Ve-2,F oryzihabitansis an unusual gram-negative, nonfermenting, oxidase-negative bacillus that is uncommonly associated with serious illness in humans.’ First described by Dresel and Stickl in 1928 and initially assigned the nameBacterium typhiflavumbecause of its similarity to the typhoid bacillus, the organism has been isolated from a variety of human sources, including blood, wounds, and abscesses, and (in mixed cultures) from sputum, urine, and cervical cultures.
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Feshchenko, Bohdan. "Deformations of smooth functions on 2-torus." Proceedings of the International Geometry Center 12, no. 3 (2019): 30–50. http://dx.doi.org/10.15673/tmgc.v12i3.1528.
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Let $f$ be a Morse function on a smooth compact surface $M$ and $\mathcal{S}'(f)$ be the group of $f$-preserving diffeomorphisms of $M$ which are isotopic to the identity map. Let also $G(f)$ be a group of automorphisms of the Kronrod-Reeb graph of $f$ induced by elements from $\mathcal{S}'(f)$, and $\Delta'$ be the subgroup of $\mathcal{S}'(f)$ consisting of diffeomorphisms which trivially act on the graph of $f$ and are isotopic to the identity map. The group $\pi_0\mathcal{S}'(f)$ can be viewed as an analogue of a mapping class group for $f$-preserved diffeomorphisms of $M$. The groups $\pi_0\Delta'(f)$ and $G(f)$ encode ``combinatorially trivial'' and ``combinatorially nontrivial'' counterparts of $\pi_0\mathcal{S}'(f)$ respectively. In the paper we compute groups $\pi_0\mathcal{S}'(f)$, $G(f)$, and $\pi_0\Delta'(f)$ for Morse functions on $2$-torus $T^2$.
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Gogineni, V. K., and A. Modrykamien. "Lung Abscesses in 2 Patients With Lancefield Group F Streptococci (Streptococcus milleri Group)." Respiratory Care 56, no. 12 (2011): 1966–69. http://dx.doi.org/10.4187/respcare.01316.
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Deaconescu, Marian. "On a special class of finite 2-groups." Glasgow Mathematical Journal 34, no. 1 (1992): 127–31. http://dx.doi.org/10.1017/s0017089500008624.
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In the course of classifying those finite groups F which have exactly five maximal subgroups, R. W. van der Waall [4] proved that one encounters the following situation. One class of such groups F is described by F = SP, where S = O2(F)∈Syl2(F), P ∈ Syl3(F), S/Φ(S) ≅ Z2 × Z2, P is cyclic and P operates via conjugation on 5 as a group of order 3, because in this case F/Φ(F) ≅ A4.
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Brown, Kenneth A. "Class groups and automorphism groups of group rings." Glasgow Mathematical Journal 28, no. 1 (1986): 79–86. http://dx.doi.org/10.1017/s0017089500006376.
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This paper is a sequel to [2]. A polycyclic-by-finite group G was there called dihedral free if G contains no subgroup isomorphic to 〈b, a:ba = b-1 a2 = 1〉 whose normalizer has finite index in G. It was shown in [2, Theorem F] that, if R is a commutative Noetherian domain, the group ring RG is a prime Noetherian maximal order if and only if R is integrally closed, G is dihedral free, and G has no non-trivial finite normal subgroups. Throughout, R and G will be assumed to satisfy these hypotheses. The main aim of the paper is to study the class group of the maximal order RG.
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Li, Yufang, and Zhe Dong. "P-Tensor Product for Group C*-Algebras." Mathematics 8, no. 4 (2020): 627. http://dx.doi.org/10.3390/math8040627.
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In this paper, we introduce new tensor products ⊗ p ( 1 ≤ p ≤ + ∞ ) on C ℓ p * ( Γ ) ⊗ C ℓ p * ( Γ ) and ⊗ c 0 on C c 0 * ( Γ ) ⊗ C c 0 * ( Γ ) for any discrete group Γ . We obtain that for 1 ≤ p < + ∞ C ℓ p * ( Γ ) ⊗ m a x C ℓ p * ( Γ ) = C ℓ p * ( Γ ) ⊗ p C ℓ p * ( Γ ) if and only if Γ is amenable; C c 0 * ( Γ ) ⊗ m a x C c 0 * ( Γ ) = C c 0 * ( Γ ) ⊗ c 0 C c 0 * ( Γ ) if and only if Γ has Haagerup property. In particular, for the free group with two generators F 2 we show that C ℓ p * ( F 2 ) ⊗ p C ℓ p * ( F 2 ) ≇ C ℓ q * ( F 2 ) ⊗ q C ℓ q * ( F 2 ) for 2 ≤ q < p ≤ + ∞ .
Dissertations / Theses on the topic "Group F(2"
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Österlund, Camilla. "Activation of lung epithelial cells by group 2 mite allergens." Doctoral thesis, Umeå universitet, Lungmedicin, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-51619.
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Throughout many parts of the world house dust mites (HDM) are considered as a major source of indoor aeroallergens and they are powerful inducers of allergic diseases. Proteolytic HDM allergens are recognised as being able to directly activate respiratory epithelial cells and thereby actively participate in innate immune responses. Although several major HDM allergens lack proteolytic activity, their possible ability to similarly interact with epithelial cells is not known. The overall aim of this thesis was therefore to elucidate if and how major non-proteolytic group 2 allergens from different mite species interact with respiratory epithelial cells. The effects of the structurally related Der p 2, Der f 2 and Eur m 2 from different HDM species as well as the storage mite allergen Lep d 2 were studied in vitro using human respiratory epithelial cells. Also the non-proteolytic, but structurally dissimilar, Fel d 1 from cat, Can f 2 from dog, Bet v 1 from birch and Phl p 5a from timothy were studied. In this thesis evidence that major group 2 mite allergens activate bronchial epithelial cells is presented. Following allergen exposure the secreted amount of the inflammatory mediators G-CSF, GM-CSF, IL-6, IL-8, MCP-1, MIP-3α and sICAM-1 was increased. Surface expression of ICAM-1 was also increased following allergen exposure. Moreover, Fel d 1 and Can f 2 induced secretion of the same mediators from bronchial epithelial cells, representing two additional protein structures being able to directly induce cell activation. In experiments using specific inhibitors and siRNA transfection, it was shown that the mite allergens engage TLR4 and activation through MyD88, MAPK and NF-κB signal transduction pathways. In conclusion, the novel findings in this thesis provide knowledge on how major aeroallergens, in addition to their ability to provoke specific adaptive immune responses, may aggravate a respiratory airway disease by adjuvant-like activation of inflammatory responses in bronchial epithelial cells. This differs from previously reported allergen-induction of epithelial cells by the clear independency of proteolytic activation.
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Bond, Nell G. "Understanding the Emergence of HIV-2 Group F, a Novel, Pathogenic HIV-2 Indigenous to Sierra Leone." Thesis, Tulane University, School of Public Health and Tropical Medicine, 2015. http://pqdtopen.proquest.com/#viewpdf?dispub=3734417.
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<p> Background: AIDS is caused by infection with pathogenic strains of HIV-1 or 2. HIV-2 is broken into 9 groups, A-I. Groups A and B are epidemic in West Africa while the remaining groups are individual cases and are not known to be pathogenic. HIV-2F is an exception being both pathogenic and found in 2 persons, suggesting transmissibility. HIV's origins have been widely studied, however, questions remain. The simian ancestry of HIV is well established yet exactly how SIV adapted to HIV in humans is still unknown. Several theories have been put forth to explain HIV emergence from SIV including the serial passage theory of HIV emergence. Here we conduct an HIV survey in northern Sierra Leone (SL) to assess the public health threat of HIV-2F and also model the serial passage theory of emergence both in vivo and in vitro to elucidate mechanisms of adaptation.</p><p> Materials and methods: For the human HIV study in northern SL, we enrolled persons presenting for a voluntarily HIV test following education and outreach activities and those referred for an HIV test. This is a targeted, higher risk population than the general population. Commercial HIV-1/2 rapid tests were used in the field. Proviral DNA was amplified with PCR methods and sequenced with Sanger methods. Parallel pigtailed (PTM) and rhesus macaque in vivo and in vitro models were used to test the serial passage theory of HIV emergence. Virus was detected with an HIV-2F specific qPCR and commercial SIV p27 Antigen ELISA. Illumina methods were used to deep sequence day 3 samples with peak virus loads. A SNP analysis was conducted to investigate virus variation over serial passage.</p><p> Results: To date we have found the prevalence of HIV in the targeted sample population to be 6.36%. HIV-2 rates in the targeted sample were 0.50%, HIV-1 was 4.81% and apparent co-infections were seen in 1.06% of those tested. Two HIV-1 samples have been sequenced and typed to CRF02_AG. Attempts to PCR amplify proviral DNA from HIV-2 antibody positives were negative, possibly due to low virus load. In vitro, over serial passage, peak virus load decreased to undetectable, the opposite of what was expected. In fact, the in vitro serial passage results exactly contradict what was observed in a parallel in vivo serial passage experiment. In vivo we saw an increase in PVL over serial passage in the PTMs and viral escape in passages 2 and 3. SNP analysis showed mutations over serial passage allowing the virus to adapt to a new host in vivo.</p><p> Conclusion: In this study we asked two main research questions. First, is HIV-2F a public health threat? This question remains unanswered due to our inability to sequence the HIV-2 samples collected in this study. However, the samples remain preserved for applying different techniques. We described HIV burden in a self-selected, at risk population in northern Sierra Leone providing the first HIV-2 data in 20 years. We also provided the first HIV-1 sequence data from Sierra Leoneans living in Sierra Leone, all previous data are from SL immigrants to Europe or the USA. The second question was, can the serial passage hypothesis of HIV emergence be modeled to elucidate the role of serial passage in HIV cross-species transmission, adaptation and diversity? We successfully showed that this can be done through the in vivo serial passage experiment in pigtailed macaques. Together the data from the field studies along with the in vivo and in vitro models presented in this thesis provide a better understanding of mechanisms of HIV emergence as well as much needed information about HIV distribution and genetic diversity in northern Sierra Leone.</p>
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Brinkmann, Christine. "Heavier group 2 metals : application to intermolecular hydroamination, C-F activation and intramolecular hydroalkoxylation." Thesis, Imperial College London, 2011. http://hdl.handle.net/10044/1/9155.
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This thesis describes the reactivity of different heavier alkaline earth catalysts [M{X(SiMe3)2}2(THF)n]m (M = Ca, Sr, Ba; X = N, CH; n= 0, 2; m= 1, 2) in the intermolecular hydroamination of styrene derivatives. The scope of these reactions with respect to the substrate was determined and detailed kinetic studies to establish rate law and temperature dependence of the hydroamination reactions reported were conducted. Overall, it was found that [Ca{N(SiMe3)2}2]2 is favoured enthalpically (Ca: ΔH‡ = 51 kJ∙mol-1, Sr: ΔH‡ = 71 kJ∙mol-1) however the corresponding strontium bis(amide) proved a significantly better catalyst, likely due to a favourably high entropy of activation value (Ca: ΔS‡ = -168 J/mol-1 ·K-1, Sr: ΔS‡ = -92 J∙mol-1∙K-1). Large kinetic isotope effects of 4.1 and 7.9 at 55 °C for the intermolecular hydroamination of styrene with piperidine mediated by [Ca{N(SiMe3)2}2]2 and [Sr{N(SiMe3)2}2]2, respectively, suggest a rate-determining alkene insertion into the M-N bond with immediate or concerted protonolysis. The methodology used in these hydroamination reactions was extended to simple dienes, diphenylacetylene and an activated enyne. The catalyst initiation of the metal bis(amides) with piperidine was shown to be reversible and the equilibrium constant solvent dependent. Novel calcium and strontium dialkyl complexes [M{CH(SiMe3)2}2(THF)2] (M= Ca, Sr) were used to overcome the problem of catalyst initiation and showed a different solvent dependence. An enhanced reactivity was found for the dialkyl complexes compared to the metal bis(amides). This increased reactivity allowed the application in new reactions such as the C-F activation of fluorobenzenes. Furthermore, the use of these catalytic systems was successfully extended to intramolecular hydroalkoxylation reactions of alkynyl alcohols in the formation of five- and six-membered enol ethers. In this case, [Ba{N(SiMe3)2}2]2 displayed significant reactivity although the “catalyst of choice” for these reactions proved to be strongly dependent on substrate substitution pattern. Through detailed kinetic studies the catalyst, substrate and temperature dependence of the cyclisation reaction were established and an unusual rate law with inverse substrate dependence proposed.
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Edeson, Margaret, and n/a. "Investigations in coset enumeration." University of Canberra. Information Sciences & Engineering, 1989. http://erl.canberra.edu.au./public/adt-AUC20050712.083514.
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The process of coset enumeration has become a significant factor in
group theoretical investigations since the advent of modern computing
power, but in some respects the process is still not well understood.
This thesis investigates some features of coset enumeration, working
mainly with the group F(2,7).
Chapter 1 describes the characteristics of coset enumeration and
algorithms used for it. A worked example of the method is provided.
Chapter 2 discusses some features which would be desirable in computer
programs for use in investigating the coset enumeration process itself,
and reviews the Havas/Alford program which to date best meets the
requirements.
Chapter 3 deals with the use of coset ammeration in proofs, either in
its own right or as a basis for other workings. An example of one
attempt to obtain a proof by coset enumeration is given.
Chapter 4 reviews techniques designed to reduce the length of coset
enumerations and proposes the 'equality list' technique as a way to
reduce enumeration length for some groups. Extra insights obtainable
using the equality list method are also discussed.
Chapter 5 summarises the factors by which the success of different
coset enumerations can be compared and proposes an algorithm for making
systematic comparisons among enumerations.
Chapter 6 reports five coset enumerations, obtained manually by three
main methods on the group F(2,7). All these enumerations were shorter
than is so far obtainable by machine and one is shorter than other
known hand enumerations. The enumerations were compared by applying
the process developed in Chapter 5.
Chapter 7 presents a shorter proof of the cyclicity of the group F(2,7)
than was hitherto available. The proof derives from the workings for
one of the coset enumerations described in Chapter 6.
There are eight appendices and an annotated bibliography. The
appendices contain, inter alia, edited correspondence between
well-known coset-enumerators, a guide to the Havas/Alford program,
further details on the equality list method and listings of various
enumerations.
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Chung, Chiang-hon. "An empirical investigation of the effects of the social skills training on a group of F.2 students." Click to view the E-thesis via HKUTO, 1991. http://sunzi.lib.hku.hk/HKUTO/record/B38627140.
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Chung, Chiang-hon, and 叢蔣漢. "An empirical investigation of the effects of the social skills training on a group of F.2 students." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1991. http://hub.hku.hk/bib/B38627140.
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Xu, Guozhou. "Crystal structures of the Fanconi anemia proteins : structure of the interstrand cross-linking repair protein Fanconi anemia protein I (FANCI); structure of the human FANCF C-terminal domain; reconstitution and crystallilzation of the sub-complexes in the Fanconi anemia core complex /." Access full-text from WCMC, 2009. http://proquest.umi.com/pqdweb?did=1692100351&sid=1&Fmt=2&clientId=8424&RQT=309&VName=PQD.
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Katona, Gregory. "Field Theoretic Lagrangian From Off-Shell Supermultiplet Gauge Quotients." Doctoral diss., University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5958.
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Recent efforts to classify off-shell representations of supersymmetry without a central charge have focused upon directed, supermultiplet graphs of hypercubic topology known as Adinkras. These encodings of Super Poincare algebras, depict every generator of a chosen supersymmetry as a node-pair transformtion between fermionic / bosonic component
fields. This research thesis is a culmination of investigating novel diagrammatic sums of gauge quotients by supersymmetric images of other Adinkras, and the correlated building of field theoretic worldline Lagrangians to accommodate both classical and quantum venues. We find Ref [40], that such gauge quotients do not yield other stand alone or ”proper” Adinkras as afore sighted, nor can they be decomposed into supermultiplet sums, but are rather a connected ”Adinkraic network”. Their iteration, analogous to Weyl's construction for producing all finite-dimensional unitary representations in Lie algebras, sets off chains of algebraic paradigms in discrete-graph and continuous-field variables, the links of which feature distinct, supersymmetric Lagrangian templates. Collectively, these Adiankraic series air new symbolic genera for equation to phase moments in Feynman path integrals. Guided in this light, we proceed by constructing Lagrangians actions for the N = 3 supermultiplet YI /(iDI X) for I = 1, 2, 3, where YI and X are standard, Salam-Strathdee superfields: YI fermionic and X bosonic. The system, bilinear in the component fields exhibits a total of thirteen free parameters, seven of which specify Zeeman-like coupling to external background (magnetic) fluxes. All but special subsets of this parameter space describe aperiodic oscillatory responses, some of which are found to be surprisingly controlled by the golden ratio, ? ? 1.61803, Ref [52]. It is further determined that these Lagrangians allow an N = 3 ? 4 supersymmetric extension to the Chiral-Chiral and Chiral-twisted-
Chiral multiplet, while a subset admits two inequivalent such extensions. In a natural progression, a continuum of observably and usefully inequivalent, finite-dimensional off-shell
representations of worldline N = 4 extended supersymmetry are explored, that are variate
from one another but in the value of a tuning parameter, Ref [53]. Their dynamics turns
out to be nontrivial already when restricting to just bilinear Lagrangians. In particular, we
find a 34-parameter family of bilinear Lagrangians that couple two differently tuned supermultiplets to each other and to external magnetic fluxes, where the explicit parameter dependence is unremovable by any field redefinition and is therefore observable. This offers the evaluation of X-phase sensitive, off-shell path integrals with promising correlations
to group product decompositions and to deriving source emergences of higher-order background flux-forms on 2-dimensional manifolds, the stacks of which comprise space-time volumes. Application to nonlinear sigma models would naturally follow, having potential use in M- and F- string theories.<br>Ph.D.<br>Doctorate<br>Physics<br>Sciences<br>Physics
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Zhang, Zhensheng. "Oxygen Bridged Metal Systems: Heterometallic Compounds Containing Main Group Metal, Transtion Metal and f-Elements." Doctoral thesis, 2010. http://hdl.handle.net/11858/00-1735-0000-0006-AEC9-2.
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Lv, Guohua. "Protein Structure Characterization by Solid-State NMR: Structural Comparison of Mouse and Human alpha-Synuclein Fibrils, Sparse 13C Labeling Schemes, and Stereospecific Assignment of Val and Leu Prochiral Methyl Groups." Doctoral thesis, 2013. http://hdl.handle.net/11858/00-1735-0000-0015-983C-F.
Full textBooks on the topic "Group F(2"
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Kenneth, Hardy, Carleton University. Dept. of Mathematics and Statistics., and University of Ottawa. Dept. of Mathematics., eds. Table of the relative class numbers h*(K) of imaginary cyclic quartic fields K with h*(K)=2(MOD4) and conductor f < 416,000. Carleton University, Mathematics and Statistics, 1987.
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Dritev – Drivetrain For Vehicles 2018. VDI Verlag, 2018. http://dx.doi.org/10.51202/9783181023280.
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Die Dritev 2018, ein internationaler VDI Kongress, der es in sich hat: 3 Veranstaltungen an 2 Tagen! Neben der „Drivetrain for Vehicles“ fanden auch noch die „EDrive“ sowie die „Transmission in mobile machines“ statt. … und hier in diesem Band erhalten Sie alle Vorträge und Präsentationen. Inhalt (Auszüge): AT/DCT The all-new 8-speed AT for the Opel Grandland X 1 G. Bednarek, K. Geratz, Opel Automobile GmbH, Rüsselsheim, H. Chariou, Groupe PSA, La Garenne Colombes, France The new BMW automatic transmission – Challenges in development 11 M. Roßhuber, G. Schromm, K. Kranz, BMW AG, München Third Generation of ZF’s 8-speed automatic transmission – Reducing CO2 emissions in the 8HP transmission 23 C. Sibla, A. Donges, F. Jauch, ZF Friedrichshafen AG, Friedrichshafen Enhancement of a dual clutch transmission kit – AUDI S tronic – Version for All-Wheel Drive, Increase of Torque and HV Electrification 33 A. Schmidt, H.-P. Fleischm...
Book chapters on the topic "Group F(2"
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Aigner, Martin. "The Free Group F 2." In Markov's Theorem and 100 Years of the Uniqueness Conjecture. Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-00888-2_6.
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Villars, P., K. Cenzual, R. Gladyshevskii, et al. "{[K(H2O)2]4H8PW12O44}F∙8H2O." In Landolt-Börnstein - Group III Condensed Matter. Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-22847-6_343.
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Mattina, Liborio. "Bentley A. F. – A Failed Attempt to Build a Group Theory." In The Palgrave Encyclopedia of Interest Groups, Lobbying and Public Affairs. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-13895-0_130-2.
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Villars, P., K. Cenzual, J. Daams, et al. "KMg3AlSi3O10(OH,F)2 trigonal." In Structure Types. Part 8: Space Groups (156) P3m1 – (148) R-3. Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-70892-6_294.
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Kamran, N., and W. F. Shadwick. "The solution of the cartan equivalence problem for $$\frac{{d^2 y}}{{dx^2 }} = F(x,y,\frac{{dy}}{{dx}})$$ under the pseudo-group $$\bar x = \varphi (x),\bar y = \psi (x,y)$$." In Field Theory, Quantum Gravity and Strings. Springer Berlin Heidelberg, 1988. http://dx.doi.org/10.1007/3-540-16452-9_20.
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Groß, Thomas. "Statistical Reliability of 10 Years of Cyber Security User Studies." In Lecture Notes in Computer Science. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-79318-0_10.
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AbstractBackground. In recent years, cyber security user studies have been appraised in meta-research, mostly focusing on the completeness of their statistical inferences and the fidelity of their statistical reporting. However, estimates of the field’s distribution of statistical power and its publication bias have not received much attention.Aim. In this study, we aim to estimate the effect sizes and their standard errors present as well as the implications on statistical power and publication bias.Method. We built upon a published systematic literature review of 146 user studies in cyber security (2006–2016). We took into account 431 statistical inferences including t-, $$\chi ^2$$ χ 2 -, r-, one-way F-tests, and Z-tests. In addition, we coded the corresponding total sample sizes, group sizes and test families. Given these data, we established the observed effect sizes and evaluated the overall publication bias. We further computed the statistical power vis-à-vis of parametrized population thresholds to gain unbiased estimates of the power distribution.Results. We obtained a distribution of effect sizes and their conversion into comparable log odds ratios together with their standard errors. We, further, gained funnel-plot estimates of the publication bias present in the sample as well as insights into the power distribution and its consequences.Conclusions. Through the lenses of power and publication bias, we shed light on the statistical reliability of the studies in the field. The upshot of this introspection is practical recommendations on conducting and evaluating studies to advance the field.
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Cleary, Sean. "Thompson’s Group." In Office Hours with a Geometric Group Theorist. Princeton University Press, 2017. http://dx.doi.org/10.23943/princeton/9780691158662.003.0016.
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This chapter considers the Thompson's group F. Thompson's group F exhibits several behaviors that appear paradoxical. For example: F is finitely presented and contains a copy of F x F, indicating that F contains the direct sum of infinitely many copies of F. In addition, F has exponential growth but contains no free groups of rank 2. After providing an overview of the analytic definition and basic properties of the Thompson's group, the chapter introduces a combinatorial definition of F and two group presentations for F, an infinite one and a finite one. It also explores the subgroups, quotients, endomorphisms, and group action of F before concluding with an analysis of several geometric properties of F such as word length, distortion, dead ends, and growth. The discussion includes exercises and research projects.
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"The general linear group GL(2, F)." In Groups. Cambridge University Press, 1985. http://dx.doi.org/10.1017/cbo9781139163590.014.
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Schweitzer, George K., and Lester L. Pesterfield. "The Fluorine Group." In The Aqueous Chemistry of the Elements. Oxford University Press, 2010. http://dx.doi.org/10.1093/oso/9780195393354.003.0013.
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The Fluorine Group of the Periodic Table, whose elements are known as halogens (Greek halos and genes, meaning salt-forming), consists of fluorine F, chlorine Cl, bromine Br, iodine I, and astatine At. The outer electron structure ns2np5 characterizes all five of the elements, with n representing principal quantum numbers 2, 3, 4, 5, and 6, respectively. The ns2np5 indicates that oxidation number possibilities are −I, I, III, V, and VII with F showing only −I (except for the unstable HOF). The bonding in the oxidation state of −I is sometimes ionic and sometimes covalent, while that in the other states is covalent. Fluorine is the most electronegative element in the Periodic Table, and as one descends the group, the electronegativities decrease. Fluorine stands out as considerably different from the other elements, there being numerous discontinuities in properties between it and Cl. Astatine also differs from the other elements in that all its isotopes are radioactive, the longlived At-210 having a half life of 8.1 days. Covalent radii in pm are as follows: F(71), Cl(99), Br(114), I(133), and At (147). Ionic radii in pm are as: F−(119), Cl−(167), Br−(182), and I−(206). a. E–pH diagram. Figure 11.1 depicts the E–pH diagram for F with the soluble species (except H+) at 10−1.0 M. The diagram is valid only in the absence of substances with which F forms soluble complexes or insoluble compounds. The species which have been considered are F2, OF2, F−, HF, and HF2−. This last species is not very stable and will appear on the diagram only at higher F− concentrations. It shows up in between HF and F−. The E–pH diagram emphasizes the very strong oxidizing power of F2 and indicates that it will easily attack HOH to produce OF2. The species oxygen fluoride OF2 is also unstable but persists in solution longer than F2.
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Fox, Renée C. "Introduction to the Metabolic Research Group and Ward F-Second." In Experiment Perilous. Routledge, 2020. http://dx.doi.org/10.4324/9780429334092-2.
Full textConference papers on the topic "Group F(2"
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Akelaitis, Arturas. "Development Of Emotional Skills Among 15–16-Year-Old Adolescents In Physical Education Classes." In 12th International Conference on Kinanthropology. Masaryk University Press, 2020. http://dx.doi.org/10.5817/cz.muni.p210-9631-2020-24.
Full textAbstract:
Background: The aim of this study was to investigate the effectiveness of the 16 weeks educational program of emotional skills in physical education classes on development of emotional skills among 15–16-year-old adolescents in physical education classes. Study hy-pothesis – the application of 16 weeks educational program would allow expecting more de-veloped emotional skills among 15–16-year-old adolescents in physical education classes. Subjects and methods: Participants in the study were 51 pupils of the ninth grade (15.15±0.36). Experimental group consisted of 25 and the control group of 26 adolescents. The measures of emotional skills were evaluated using Emotional Intelligence Questionnaire – Short Form (TEIQue – SF), Social Emotional School Readiness Scale (BUSSESR), and self-confidence methodology, developed by Stolin (Пантилеев, Столин, 1989). Educational experiment was used as a method to verify the eficiency of the educational program. Repeated measures (RM) multivariate analysis of variance (2 × 2 (Group × Time) MANOVA) was used in order to analyze the effects of the educational program. Results: After the 16-weeks educational program (structural physical education classes), a significant improvement was found in emotional skills scores for the experimental group compared with the control group, which had a statistically significant effects: adolescents in the experimental group had more developed self-awareness (F (1,49) = 5.86; p < .05; η 2 = .11), self-confidence (F (1,49) = 5.28; p < .05; η 2 = .10) skills, and the abilities to express emotions (F (1,49) = 5.95; p < .05; η 2 = .11) in physical education classes. These results indi-cated that the structural physical education classes had a positive influence on adolescents’ emotional skills. Conclusions: It was found that during the 16 weeks educational experiment the applied mea-sures of educational impact had a statistically significant effect on the components of exper-imental group 15–16-year-old adolescents’ self-awareness, self-confidence skills, and the abilities to express emotions in physical education classes.
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Yoshioka, A., M. Shima, I. Tanaka, T. Fujiwara, H. Nakai, and H. Fukui. "ANALYSIS OF HUMAN FACTOR VIII INHIBITOR EPITOPES TO FACTOR VIII POLYPEPTIDES BY IMMUNOBLOTTING." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644029.
Full textAbstract:
In order to clarify human factor VIII inhibitor epitopes to factor VIII (F. VIII), we analyzed the inhibitor IgG developed in the patients with hemophilia A and autoimmune disease using immunoblotting of purified F. VIII and thrombin-degraded F. VIII. IgG fractions were obtained from 6 cases of severe hemophilia A and one autoimmune disease. The titer of the inhibitor plasma ranged from 50 to 3,000 Bethesda units/ml. Purification of F. VIII from commercial F. VIII concentrate was performed by immunoadsorbent column chromatography using anti-von Willebrand factor monoclonal antibody and anti-fibrinogen, anti-fibronectin and anti-IgM goat antibodies and subsequently by Aminohexyl Sepharose column chromatography essentially according to the method of Fulcher et al.. The specific activity of the purified F. VIII was 2,700 units/mg. On sodium-dodecylsulfate (SDS) 5 to 10% gradient polyacrylamide gel electrophoresis (PAGE), 80 kDa of a main fragment and a series of 90 to 210 kDa fragments were visualyzed by Coomassie blue staining. Immunoblotting of 5-10 ug of each of unreduced purified F. VIII and thrombin-degraded F. VIII. followed by reaction with inhibitor IgG samples, monoclonal antihuman IgG-3 and IgG-4 antibodies and radiolabeled rabbit antimouse IgG.All inhibitor IgG samples reacted with both purified F. VIII and thrombin-degraded F. VIII. The pattern of reactivity of inhibitor antibodies was divided into three groups; 1) inhibitor IgG which reacted with 80 and 70 kDa derived from carboxy-terminus of the F. VIII molecule, 2) inhibitor IgG which reacted with 90 to 210 kDa and 54 and/or 44 kDa derived from amino-terminus of the F. VIII, and 3) inhibitor IgG which reacted with both of N- and C-terminus of the F. VIII. One inhibitor IgG belonged to group 3 strongly reacted with a series of higher molecular polypeptides of F. VIII ranged from 180 .to 210 kDa. One autoantibody IgG from the patient with autoimmune disease was also belonged to group 3. There was no relationship between the titer and the pattern of reactivity of each inhibitor plasma. In summary, there is a heterogeneity of F. VIII inhibitor epitopes to F. VIII molecules.
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Schramm, W., L. G. Gürtler, H. Pohlmann, I. Weigel, J. Eberie, and F. Deinhardt. "INCIDENCE OF HIV-1 AND HIV-2 ANTIBODIES IN HEMOPHILIACS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1644142.
Full textAbstract:
The presence of antibodies to HIV-1 (anti-HIV-1) was tested in 167 hemophiliacs surveyed and treated at Munich hemophilia center. Increasing numbers of HIV infected patients were observed in the years 1981 to 1986 from 0% to 51,5% (86 positive patients in January 1987 of 167 followed patients). Most of the seroconver-sions occured between 1982 and 1984. The 150 clinically severe affected hemophiliacs (F-VIII-levels up to 5% and need of replacement therapy) showed positive HIV-test results in 55,3% (83 patients) and negative results in 44,7% (67 patients). 5 patients died since 1981, one because of AIDS. 17 patients were not seen since 1984, 14 of those belong to the severly affected group, 12 of them were negative. Since spring 1985 only heat or chemically treated clotting factor preparations are used for substitution. Despite this still 5 seroconversions were observed. Two may be attributed to the use of a preparation heat inactivated in dry state, this preparation is no longer used. The other 3 seroconversions possibly were caused by an occasional use of an noninactivated preparation in the beginning of the change to inactivated clotting factor preparations. 38 of the anti-HIV-1 positive sera were tested for the presence of HIV-2 antibodies also. The methods were ELISA,immunofluorescence and immunoblot. HIV-2 (LAV-2) for these tests was kindly provided by L. Montagnier. Antibodies specific for HIV-2 antigens were not detected, but crossreactions were observed between anti-HIV-1 with HIV-2 antigens particularly epitopes on HIV-2-p27.The data indicate that the use of adequately inactivated clotting factors can prevent infection of hemophilia patients by this route and that HIV-2 was not present in the clotting factor preparations used for the substitution of this group of patients. The incidence of full blown AIDS since 1981 in our group of hemophiliacs is still low (1,2%).
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Dames, C. "A Broad Range of Phonon Mean Free Paths Is Important for Heat Conduction." In ASME 2008 First International Conference on Micro/Nanoscale Heat Transfer. ASMEDC, 2008. http://dx.doi.org/10.1115/mnht2008-52270.
Full textAbstract:
The thermal conductivity is modeled with a spectral form of kinetic theory k=13∫CωνLdω(1) where ω is the angular frequency, Cω is the specific heat per unit frequency, ν = ∂ω/∂q is the group velocity, and L is the effective mean free path (MFP) which combines bulk and boundary scattering using Matthiessen’s rule: Cω=ħωDOS∂f/∂T(2)L−1=Lbulk−1+Lboundary−1.(3) Here q is the wavevector, DOS is the density of states (acoustic modes only), T is the temperature, and f is the Bose-Einstein distribution function.
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Anichina, K. "SYNTHESIS AND ANTINEMATODAL ACTIVITY STUDIES OF SOME FUSED TRIAZINOBENZIMIDAZOLES." In International Trends in Science and Technology. RS Global Sp. z O.O., 2020. http://dx.doi.org/10.31435/rsglobal_conf/30122020/7351.
Full textAbstract:
4-Aryl-3,4-dihydro[1,3,5]triazino[1,2-a]benzimidazole-2-amines 3a-f were synthesized in the reaction of cyclocondensation between 2-guanidinobenzimidazole and versatilebenzaldehydes. Structures of all prepared compounds were confirmed by IR, 1H NMR spectroscopyand elemental analysis.Antinematodal activity in vitro of the substances was investigated using isolated Trichinella spiralis muscle larvae. The tested triazonobenzimidazoles showed different activity depending on the substituent R in their moleculeas the derivatives substituted with a hydroxyl group demonstrated the best anti-Trichinella spiralis activity in the series.
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Petitou, M., J. C. Lormeau, and J. Choay. "AT III BINDING SITE OF HEPARIN. DETERMINATION OF THE ROLE OF SULFATE GROUPS AT THE REDUCING-END DISACCHARIDE THROUGH NEW SYNTHETIC PENTASACCHARIDES." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1642826.
Full textAbstract:
A unique sequence is required in heparin for binding to antithrombin III (AT III) and eliciting anti-factor Xa activity. We have previously synthesized a pentasaccharide containing all the structural features of this sequence. It binds to AT III with the same affinity as high affinity heparin. The complex thus formed has a high anti-factor Xa activity. We have now synthesized a new series of α-methylated pentasaccharides which better mimic the naturally occurring configuration at C1 of the reducing-end glucosamine unit. The synthesis of the inactive pentasaccharide II allowed us to confirm in this series the essential role of the 3-sulfate group borne by glucosamine unit F. Wehave also particularly addressed the still unanswered question regarding the role of the 2-sulfate group borne by iduronic acid G and of the 6-sulfate group borne by glucosamine unit H. Pentasaccharides III and IV elicit the same anti-factor Xa activity which is substantially decreased as compared to I. A similar decrease has been recently reported for pentasaccharide V (T. Beetz & C.A.A. van Boeckel, Tetrahedron Lett., 1986, 27, 5889). We therefore conclude that the presence of both these sin fate groups is required for full expression of the antifactor Xa activity.
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Townsend, Dennis P. "Improvement in Surface Fatigue Life of Hardened Gears by High-Intensity Shot Peening." In ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0082.
Full textAbstract:
Abstract Two groups of carburized, hardened, and ground spur gears that were manufactured from the same heat of vacuum-induction-melted vacuum-are-remelted (VIM-VAR) AISI 9310 steel were endurance tested for surface fatigue. Both groups were manufactured with a standard ground 16-rms surface finish. One group was subjected to a shot-peening intensity of 7 to 9A, and the second group was subjected to a shot-peening intensity of 15 to 17A. All gears were honed after shot peening to a surface finish of 16 rms. The gear pitch diameter was 8.89 cm (3.5 in.). Test conditions were a maximum Hertz stress of 1.71 GPa (248 ksi), a gear temperature of 350 K (170 °F), and a speed of 10 000 rpm. The lubricant used for the tests was a synthetic paraffinic oil with an additive package. The following results were obtained: The 10-percent surface fatigue (pitting) life of the high-intensity (15 to 17A) shot-peened gears was 2.15 times that of the medium-intensity (7 to 9A) shot-peened gears, the same as that calculated from measured residual stress at a depth of 127 μm (5 mil). The measured residual stress for the high-intensity-shot-peened gears was 57 percent higher than that for the medium-intensity-shot-peened gears at a depth of 127 μm (5 mil) and 540 percent higher at a depth of 51 μm (2 mil).
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Morani, A., F. Gianese, and P. Bianchini. "KINETICS OF EXPERIMENTAL ANTITHROMBOTIC ACTIVITY OF MF 701 DERMATAN SULFATE." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643244.
Full textAbstract:
In order to evaluate the intensity and duration of the prophylactic activity of dermatan sulfate against thrombosis induced by ligature of the inferior vena cava (Reyers'model), we treated 6 groups of rats at increasing intervals of time before ligature (1 min, 30 min, 45 min, 2 h, 16 h). Within each group the rats were injected subcutaneously with saline solution (controls) or increasing doses (2.5, 5, 10 and 20 mg/kg) of MF 701, dermatan sulfate (Mediolanum Farmaceutici, Milan, Italy). Two hours after ligature the presence of thrombi and their weight were recorded.A significant, dose-dependent antithrombotic effect was observed for all the treatment times. The maximum effect occured when the compound was administered 45 min before ligature (total abolition of thrombosis at the dose of 5 or more mg/kg). Total inhibition was also observed at 2 h (with 10 mg/kg) and at 4 h (with the same dose). A significant antithrombotic effect, over 50% com pared with the controls, was still found at 16 h at the dose of 20 mg/kg.These results confirm the experimental antithrombotic efficacy of dermatan sulfate already reported in a different animal model by F. Fernandez et al. (Br J. Haematol. 64, 309, 1986) and demonstrate the long duration of the prophylactic effect of the compound.
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Kobayashi, Hiro, and Yoshio Urabe. "Study on Strain Rate Effect on Dynamic Strain Aging and Safety Margin of Pipe Elbow at Seismic Event." In ASME 2009 Pressure Vessels and Piping Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/pvp2009-78134.
Full textAbstract:
This paper presents the technical reasoning and justification for using the B2′ = (2/3)*B2 in Paragraphs NB-3656(b) and NC/ND-3655(b) of Section III. ASME revised the rules for piping subjected to seismic and other building filtered loads in the 1994 addenda to the 1992 Code to provide an alternative to the existing rules. The purpose of the revision was to recognize the results of significant testing and experience that supported a decrease in the multiplier (B index) of the moment term, among other changes. The use of a B2′ index set equal to 2/3 of the current B2 index effectively raised the Level D allowable 50%. As part of its review in 10CFR50.55a, the NRC noted that use of the new rules was not permitted, due to disagreements in the approach. Since the 1994 addenda were published, the NRC and ASME have worked together to revise the changes. At this time, it is ASME’s understanding that the rules proposed for inclusion in the 2007 Code will be accepted by the NRC, with the exception of the use of a B2′ index equal to 2/3 of B2 for bends and tees. For those items, the NRC believes a multiplier of 3/4 is more appropriate for ferritic steels at temperatures above 300°F, due to dynamic strain aging. Concern has been expressed that since the tests that form part of the basis for setting B2′ = (2/3)*B2 were conducted at ambient temperature, the effect of dynamic strain aging of carbon steels could reduce the seismic margins at temperatures in excess of 300°F (150°C). In response to this concern, the authors prepared this paper as a team working under the Piping Seismic Task Group, ASME Code Committee. This paper demonstrates that: 1) In order to investigate this possibility, authors collected test data at room temperature, and then benchmarked its analytical work against both its tests and data from the EPRI test program since dynamic testing of components at elevated temperature and high stress levels can be quite difficult. From its analytical and test work on components, plus elevated temperature and strain rate work on small specimens, it was concluded that strain rate effects at typical seismic strain rates and amplitudes are not a concern. 2) For typical carbon steel under seismic strain rate loading, at elevated temperature [(above 300°F (150°C)] and at stress levels permitted by the alternative Code equation [NB-3556(b)(2) and NB-3556(b)(3)], the margin to failure is at least 1.5, as recommended by Dr. R.P. Kennedy(1). Thus, the use of B2′ = (2/3)*B2 results in a component with acceptable margin. This is a part of the paper prepared as a team working under the Piping Seismic Task Group under ASME Sec. III, Subgroup Design.
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Ûsterud, B., J. B. Hansen, J. O. Olsen, and L. Wilsgård. "THE EFFECT OF PHYSICAL EXERCISE ON MONOCYTE FUNCTION, COAGULATION FACTORS, FIBRINOLYSIS AND PLATELETS." In XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643171.
Full textAbstract:
Over a 2 years period, the Norwegian national team of cross country skiers, have been tested after strenous championships as well as before and after regular training.Finishing a 50 km race generated a rise of white cells from 5.4 ± 1.0 to 19.3 ± 3.7 × 109 /I (n=14). The mobilization of new and more sensitive white cells may explain the resultant rise in monocyte response to stimuli in vitro after the race. Thus, monocytes from blood incubated with 2 ng/ml blood, drawn from the athletes just after finishing the 50 km race, possessed 6-7 fold higher specific activity of thromboplastin than monocytes from blood drawn and stimulated in a rest-period. There was a positive correlation between the inverse level of F. VII in plasma of the skiers after the race and the monocyte response to stimuli in vitro as expressed by the level of thromboplastin. Activated monocytes with exposed thromboplastin are probably pulling out F. VII from the circulation just as seen in patients with gram negative septicaemia.A group of long distance runners were also tested after strenous jogging. High monocyte response to stimuli in vitro was associated with extremely active platelets that aggregated spontaneously after drawing the blood into heparin and tested it in a whole blood aggregometer. Those individuals with very active monocytes and platelets had also an extremely activation of their fibrinolytic system as judged by whole blood clot lysis. In contrast, everyone with low cell activation had hardly any change in their fibrinolytic activity after strenous running.The clear trend in this study was that almost everyone of our top athletes had a very depressed blood-cell activation system as compared to non athletes. Low blood cell activation in vivo was also associated with a low induction of the fibrinolytic system.