bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Alberta hip and knee replacement project: A model for health technology assessment based on comparative effectiveness of clinical pathways
Authors: Gooch Katherine L. , Smith Douglas , Wasylak Tracy , Faris Peter D. , Marshall Deborah A. , Khong Hoa , Hibbert Julie E. , Parker Robyn D. , Zernicke Ronald F. , Beaupre Lauren , Pearce Tim , Johnston D. W. C. , Frank Cyril B. 
Published: April 2009

Background:The Alberta Hip and Knee Replacement Project developed a new evidence-based clinical pathway (NCP) for total hip (THR) and knee (TKR) replacement. The aim was to facilitate the delivery of services in a timely and cost-effective manner while achieving the highest quality of care for the patient across the full continuum of care from patient referral to an orthopedic surgeon through surgery, recovery, and rehabilitation. The purpose of this article is to provide an overview of the study design, rationale, and execution of this project as a model for health technology assessment based on comparative effectiveness of alternative clinical pathways.Methods:A pragmatic randomized controlled trial study design was used to evaluate the NCP compared with the standard of care (SOC) for these procedures. The pragmatic study design was selected as a rigorous approach to produce high quality evidence suitable for informing decisions between relevant interventions in real clinical practice. The NCP was evaluated in three of the nine regional health authorities (RHAs) in Alberta with dedicated central intake clinics offering multidisciplinary care teams, constituting 80 percent of THR and TKR surgeries performed annually in Alberta. Patients were identified in the offices of twenty orthopedic surgeons who routinely performed THR or TKR surgeries. Evaluation outcome measures were based on the six dimensions of the Alberta Quality Matrix for Health (AQMH): acceptability, accessibility, appropriateness, effectiveness, efficiency and safety. Data were collected prospectively through patient self-completed questionnaires at baseline and 3 and 12 months after surgery, ambulatory and inpatient chart reviews, and electronic administrative data.Results:The trial design was successful in establishing similar groups for rigorous evaluation. Of the 4,985 patients invited to participate, 69 percent of patients consented. A total of 3,434 patients were randomized: 1,712 to SOC and 1,722 to the NCP. The baseline characteristics of patients in the two study arms, including demographics, comorbidity as measured by CDS and exposure to pain medications, and health-related quality of life, as measured by Western Ontario and McMaster Universities Osteoarthritis Index and Short Form-36, were similar.Conclusions:The Alberta Hip and Knee Replacement Project demonstrates the feasibility and advantages of applying a pragmatic randomized controlled trial to ascertain comparative effectiveness. This is a model for health technology assessment that incorporates how clinical pathways can be effectively evaluated.
Health technology assessment: A comprehensive framework for evidence-based recommendations in Ontario
Authors: Johnson Ana P. , Sikich Nancy J. , Evans Gerald , Evans William , Giacomini Mita , Glendining Murray , Krahn Murray , Levin Les , Oh Paul , Perera Charmaine 
Published: April 2009

Objectives:This study describes the development of a framework for health technology decisions, for Ontario Health Technology Advisory Committee (OHTAC) in Ontario, Canada.Methods:OHTAC convened a “Decision Determinants Sub-Committee” in January 2007, which undertook a systematic literature review and conducted key informant interviews to develop an explicit decision-making framework.Results:The “Decision Determinants Sub-Committee” offered recommendations about decision criteria, and the process by which decisions are made. Decision criteria include (i) overall clinical benefit, (ii) consistency with societal and ethical values, (iii) value for money, and (iv) feasibility of adoption into the health system. The decision process should be transparent and fair and should use a deliberative process in delivering recommendations.Conclusions:This methodology is currently being pilot tested in a live environment: OHTAC. It will be evaluated and revised according to its feasibility, acceptability, and perceived usefulness.
Cost-effectiveness of human papillomavirus vaccination in Belgium: Do not forget about cervical cancer screening
Authors: Thiry Nancy , De Laet Chris , Hulstaert Frank , Neyt Mattias , Huybrechts Michel , Cleemput Irina 
Published: April 2009

Objectives:The cost-effectiveness of adding a human papillomavirus (HPV) vaccination program in 12-year-old females to the recommended cervical cancer screening in Belgium is examined. Moreover, the health and economic consequences of a potential decline in screening uptake after initiation of a HPV vaccination program are investigated.Methods:A static Markov model is developed to estimate the direct effect of vaccination on precancerous lesions and cervical cancers.Results:Vaccination is estimated to avoid 20 percent of the cervical cancers occurring in a 12-year-old girls' cohort and to cost €32,665 per quality-adjusted life-year (QALY) gained (95 percent credibility interval [CrI]: €17,447 to €68,078), assuming a booster injection after 10 years, a limited duration of protection and discounting costs and effects at 3 percent and 1.5 percent, respectively. Assuming lifelong protection, HPV vaccination is estimated to cost €14,382 (95 percent CrI: €9,238 to €25,644) per QALY gained, while avoiding 50 percent of the cervical cancer cases. In the base-case, a 10 percent reduction in screening compliance after vaccination obliterates the effect of vaccination on cervical cancer cases avoided, whereas further declines in the level of screening compliance even turned out to be detrimental for the cohort's health, inducing a mean loss in QALYs and life-year gained compared with the situation prevaccination.Conclusions:An HPV vaccination program should only be considered if the level of screening after vaccination can be maintained.
Hölder-differentiability of Gibbs distribution functions
Authors: KESSEBÖHMER MARC , STRATMANN BERND O. 
Published: April 2009

AbstractIn this paper we give non-trivial applications of the thermodynamic formalism to the theory of distribution functions of Gibbs measures (devil's staircases) supported on limit sets of finitely generated conformal iterated function systems in ℝ. For a large class of these Gibbs states we determine the Hausdorff dimension of the set of points at which the distribution function of these measures is not α-Hölder-differentiable. The obtained results give significant extensions of recent work by Darst, Dekking, Falconer, Li, Morris and Xiao. In particular, our results clearly show that the results of these authors have their natural home within the thermodynamic formalism.
On indecomposable decompositions of CS-modules
Authors: Dung Nguyen V. 
Published: April 2009

AbstractIt is shown that, over any ring R, the direct sum M = ⊕i∈IMi of uniform right R-modules Mi with local endomorphism rings is a CS-module if and only if every uniform submodule of M is essential in a direct summand of M and there does not exist an infinite sequence of non-isomorphic monomorphisms , with distinct in ∈ I. As a consequence, any CS-module which is a direct sum of submodules with local endomorphism rings has the exchange property.
Universal and proximately universal limits
Authors: Čerin Zvonko , Sanjurjo Jóse M. R. 
Published: April 2009

AbstractWe present sufficient conditions on an approximate mapping F: X → Y of approximate inverse systems in order that the limit f: X → Y of F is a universal map in the sense of Holsztyński. A similar theorem holds for a more restrictive concept of a proximately universal map introduced recently by the second author. We get as corollaries some sufficient conditions on an approximate inverse system implying that the its limit has the (proximate) fixed point property. In particular, every chainable compact Hausdorif space has the proximate fixed point property.
Hilbert C*-modules and conditional expectations on crossed products
Authors: Khoshkam Mahmood 
Published: April 2009

AbstractIn this paper, we study the structure of certain conditional expectation on crossed product C*-algebra. In particular, we prove that the index of a conditional expectation E: B → A is finite if and only if the index of the induced expectation from B ⋊ G onto A ⋊ G is finite where G is a discrete group acting on B.
On the vanishing problem of string classes
Authors: Kuribayashi Katsuhiko 
Published: April 2009

AbstractThe ordinary string class is an obstruction to lift the structure group LSpin(n) of a loop group bundle LQ → LM to the universal central extension of LSpin(n) by the circle. The vanishing problem of the ordinary string class and generalized string classes are considered from the viewpoint of the ring structure of the cohomology H*(M; R).
An extension theorem for integral representations
Authors: Knapp Wolfgang , Schmid Peter 
Published: April 2009

AbstractBy a fundamental theorem of Brauer every irreducible character of a finite groupGcan be written in the field Q(εm) ofmth roots of unity wheremis the exponent ofG. Is it always possible to find a matrix representation over its ring Z[εm] of integers? In the present paper it is shown that this holds true provided it is valid for the quasisimple groups. The reduction to such groups relies on a useful extension theorem for integral representations. Iwasawa theory on class groups of cyclotomic fields gives evidence that the answer is at least affirmative when the exponent is replaced by the order, and provides for a general qualitative result.
Some characterizations of partial exchangeability
Authors: Ivanoff B. G. , Weber N. C. 
Published: April 2009

AbstractKallenberg [2] introduced the concept of F-exchangeable sequences of random variables and produced some characterizations of F-exchangeability in terms of stopping times. In this paper ways of extending the concept of F-exchangeability to doubly indexed arrays of random variables are explored and some characterizations obtained for row and column exchangebale arrays, weakly exchangeable arrays and separately exchangeable continuous processes.
Varieties of distributive lattices with unary operations I
Authors: Priestley H. A. 
Published: April 2009

AbstractA unified study is undertaken of finitely generated varieties HSP () of distributive lattices with unary operations, extending work of Cornish. The generating algebra () is assusmed to be of the form (P; ∧, ∨, 0, 1, {fμ}), where eachfμis an endomorphism or dual endomorphism of (P; ∧, ∨, 0, 1), and the Priestly dual of this lattice is an ordered semigroup N whose elements act by left multiplication to give the maps dual to the operationsfμ. Duality theory is fully developed within this framework, into which fit many varieties arising in algebraic logic. Conditions on N are given for the natural and Priestley dualities for HSP () to be essentially the same, so that,inter alia, coproducts in HSP () are enriched D-coproducts.
Locally finite affine complete varieties
Authors: Kaarli Kalle 
Published: April 2009

AbstractThe main results of the paper are the following: 1. Every locally finite affine complete variety admits a near unanimity term; 2. A locally finite congruence distributive variety is affine complete if and only if all its algebras with no proper subalgebras are affine complete and the variety is generated by one of such algebras. The first of these results sharpens a result of McKenzie asserting that all locally finite affine complete varieties are congruence distributive. The second one generalizes the result by Kaarli and Pixley that characterizes arithmetical affine complete varieties.
Certain extensions and factorizations of α-complete homomorphisms in archimedean lattice-ordered groups
Authors: Hager Anthony W. , Kizanis Ann 
Published: April 2009

AbstractAs a consequence of general principles, we add to the array of ‘hulls’ in the category Arch (of archimedean ℓ-groups with ℓ-homomorphisms) and in its non-full subcategory W (whose objects have distinguished weak order unit, whose morphisms preserve the unit). The following discussion refers to either Arch or W. Let α be an infinite cardinal number or ∞, let Homα; denote the class of α-complete homomorphisms, and let R be a full epireflective subcategory with reflections denoted rG: G → rG. Then for each G, there is rαG ∈ Homα (G, R) such that for each ϕ ∈ Homα (G, R), there is unique with . Moreover if every rG is an essential embedding, then, for every α and every G, rαG = rG, and every Homα. If and R consists of all epicomplete objects, then every Homw1. For α = ∞, and for any R, every Hom∞.
Lattice embeddings of abelian prime power groups
Authors: Schmidt Roland 
Published: April 2009

AbstractWe solve the following problem which was posed by Barnes in 1962. For which abelian groups G and H of the same prime power order is it possible to embed the subgroup lattice of G in that of H? It follows from Barnes' results and a theorem of Herrmann and Huhn that if there exists such an embedding and G contains three independent elements of order p2, then G and H are isomorphic. This reduces the problem to the case that G is the direct product of cyclic p-groups only two of which have order larger than p. We determine all groups H for which the desired embedding exists.
Construction of mixed automorphic forms
Authors: Choie Youngju 
Published: April 2009

AbstractIt has been known that mixed automorphic forms arise naturally as holomorphic forms on elliptic varieties and that they include classical automorphic forms as a special case. In this paper, we show how to construct mixed automorphic forms of type (k, l) from elliptic modular forms to give nontrivial examples of mixed automorphic forms.
The orders of nonsingular derivations
Authors: Shalev Aner 
Published: April 2009

AbstractNonsingular derivations of modular Lie algebras which have finite multiplicative order play a role in the coclass theory for pro-pgroups and Lie algebras. We study the orders of nonsingular derivations of finite-dimensional non-nilpotent Lie algebras of characteristicp> 0. The methods are essentially number-theoretic.1991Mathematics subject classification (Amer. Math. Soc): primary 17B50; secondary 12E20.
Second order Dehn functions and HNN-extensions
Authors: Wang X. , Pride S. J. 
Published: April 2009

AbstractIn previous work [2] calculations of subquadratic second order Dehn functions for various groups were carried out. In this paper we obtain estimates for upper and lower bounds of second order Dehn functions ofHNN-extensions, and use these to exhibit an infinite number of different superquadratic second order Dehn functions. At the end of the paper several open questions concerning second order Dehn functions of groups are discussed.
The depth of centres of maps on dendrites
Authors: Kato Hisao 
Published: April 2009

AbstractXiong proved that if f: I → I is any map of the unit interval I, then the depth of the centre of f is at most 2, and Ye proved that for any map f: T → T of a finite tree T, the depth of the centre of f is at most 3. It is natural to ask whether the result can be dendrites. In this note, we show that there is dendrite D such that for any countable ordinal number λ there is a map f: D →D such that the depth of centre of f is λ. As a corollary, we show that for any countable ordinal number λ there is a map (respectively a homeomorphism) f of a 2-dimensional ball B2 (respectively a 3-dimensional ball B3) such that the depth of centre of f is λ.
Generalized functions associated with self-adjoint operators
Authors: Shangping Liu 
Published: April 2009

AbstractIn this paper, from several commutative self-adjoint operators on a Hilbert space, we define a class of spaces of fundamental functions and generalized functions, which are characterized completely by selfadjoint operators. Specially, using the common eigenvectors of these self-adjoint operators, we give the general form of expansion in series of generalized functions
Medial idempotent groupoids III
Authors: Cho Jung R. , Dudek Józef 
Published: April 2009

AbstractAs a sequel to the previous two papers of the second author, we investigate the structure of medial idempotent groupoids byPn-sequences. To complete the series of research, this paper has theree purposes. First, we summarize some results in the previous papers so that this paper can cover the materials presented there. Secondly, using earlier results, we prove a few theorems which show the importance of the medial law in controlling the growth ofPn-sequences of groupoids. Finally, we state some problems and conjectures raised during the series of research.
Rationality of the generalized binomial coefficients for a multiplicity free action
Authors: Benson Chal , Ratcliff Gail 
Published: April 2009

AbstractLetVbe a finite dimensional Hermitian vector space andKbe a compact Lie subgroup ofU(V) for which th representation ofKonC[V] is multiplicity free. One obtains a canonical basis {pα} for the spaceC[VR]kofK-invariant polynomials on VRand also a basis {q's. The polynomialpα's yields the homogeneous component of highest degree inqα. The coefficient that express theqα's in terms of thepβ's are the generalized binomial coeffficients of Yan. The main result in this paper shows tht these numbers are rational.
Some Properties on Isologism of Groups
Authors: Moghaddam Mohammad Reza R. , Salemkar Ali Reza 
Published: April 2009

AbstractIn this paper a necessary and sufficient condition will be given for groups to be ν-isologic, with respect to a given variety of groups ν. Its is also shown that every ν-isologism family of a group contains a ν-Hopfian group. Finally we show that ifGis in the variety ν, then every ν-covering group ofGis a Hopfian group.
Locally Convex Spaces with Toeplitz Decompositions
Authors: Paúl Pedro J. , Sáez Carmen , Virués Juan M. 
Published: April 2009

AbstractA Toeplitz decomposition of a locally convez spaceEinto subspaces (Ek) with continuous projections (Pk) is a decomposition of everyx ∈ Easx = ΣkPkxwhere ordinary summability has been replaced by summability with respect to an infinite and row-finite matrix. We extend to the setting of Toeplitz decompositions a number of results about the locally convex structure of a space with a Schauder decomposition. Namely, we give some necessary or sufficient conditions for being reflexive, a Montel space or a Schwartz space. Roughly speaking, each of these locally convex properties is linked to a property of the convergence of the decomposition. We apply these results to study some structural questions in projective tensor products and spaces with Cesàro bases.
On the Connectedness of the Real Part of Moduli Spaces of Vector Bundles on Real Algebraic Surfaces
Authors: Ballico Edoardo 
Published: April 2009

AbstractLet X be a smooth projective surface with q(X) = 0 defined over R and M(X;r;c1;c2;H) the moduli space of H-stable rank r vector bundles on X with Chern classes c1 and c2. Assume either r = 3 and X(R) connected or r = 3 and X(R) =ø or r=2 and X(R) = ø. We prove that quite often M is connected.
An Lp Version of the Hardy Theorem for Motion Groups
Authors: Eguchi Masaaki , Koizumi Shin , Kimahara Keisaku 
Published: April 2009

AbstractWe describe a generalization of the Hardy theorem on the motion group. We prove that for some weight functions νω growing very rapidly and a measurable function f, the finiteness of the Lp-norm of vf and the Lq-norm of ωf implies f=0 (almost everywhere).
Hyperbolic Groups are Hyperhopfian
Authors: Daverman Robert J. 
Published: April 2009

AbstractThe main result indicates that every finitely generated, residually finite, torsion-free, cohopfian group having on free Abelian subgroup of rank two is hyperhopfian. The argument relies on earlier work and ideas of Hirshon. As a corollary, fundamental groups of all closed hyperbolic manifolds are hyperhopfian.
Multiplicative isogeny estimates
Authors: Masser David 
Published: April 2009

AbstractThe theory of isogeny estimates for Abelian varieties provides ‘additive bounds’ of the form ‘d is at most B’ for the degrees d of certain isogenies. We investigate whether these can be improved to ‘multiplicative bounds’ of the form ‘d divides B’. We find that in general the answer is no (Theorem 1), but that sometimes the answer is yes (Theorem 2). Further we apply the affirmative result to the study of exceptional primes ℒ in connexion with modular Galois representations coming from elliptic curves: we prove that the additive bounds for ℒ of Masser and Wüstholz (1993) can be improved to multiplicative bounds (Theorem 3).
Products of spherical derivatives and normal functions
Authors: Huaihui Chen , Lappan Peter 
Published: April 2009

AbstractChen and Gu [1] have given some results relating to normal families, and, in this paper, we give versions of these results valid for normal functions. In the process, we improve some of our previous results involving products of certain spherical derivatives as they relate to normal functions. Some examples are given to show the sharpness of our results.
On strings of consecutive integers with no large prime factors
Authors: Balog Antal , Wooley Trevor D. 
Published: April 2009

AbstractWe investigate conditions which ensure that systems of binomial polynomials with integer coefficients are simultaneously free of large prime factors. In particular, for each positive number ε, we show that there are infinitely many strings of consecutive integers of size about n, free of prime factors exceeding nε, with the length of the strings tending to infinity with speed log log log log n.
Direct products of automatic semigroups
Authors: Campbell C. M. , Robertson E. F. , Ruškuc N. , Thomas R. M. 
Published: April 2009

AbstractIt is known that the direct product of two automatic groups is automatic. The notion of automaticity bas been extended to semigroups, and this for groups has been generalized to automatic monoids. However, the direct product of two automatic semigroups need not be finitely generated and hence not automatic.Robertson, Ruškuc and Wiegold have determined necessary and sufficient conditions for the direct product of two finitely generated semigroups to be finitely generated. Building on this, we prove the following. Let S and T be automatic semigroups; if S and T are infinite, then S × T is automatic if and only if S2 = S and T2 = T; if S is finite and T is infinite, then S × T is automatic if and only if S2 = S. As a consequence, we have that, if S and T are automatic semigroups, then S × T is automatic if and only if S × T is finitely generated.
Associativity of the regular semidirect product of existence varieties
Authors: Billhardt Bernd , Szendrei Mária B. 
Published: April 2009

AbstractThe associativity of the regular semidirect product of existence varieties introduced by Jones and Trotter was proved under certain condition by Reilly and Zhang. Here we estabilsh associativity in many new cases. Moreover, we prove that the regular semidirect product is right distributive with respect to the join operation. In particular, both associativity and right distriutivity yiel within the varieties of completely simple semigroups. Analogous results are obtainedj for e-pseudovarieties of finite regular semigroups.
Diagrammatically reducible complexes and Haken manifolds
Authors: Corson J. M , Trace B. 
Published: April 2009

AbstractWe show that diagrammatically reducible two-complexes are characterized by the property: every finity subconmplex of the universal cover collapses to a one-complex. We use this to show that a compact orientable three-manifold with nonempty boundary is Haken if and only if it has a diagrammatically reducible spine. We also formulate an nanlogue of diagrammatic reducibility for higher dimensional complexes. Like Haken three-manifolds, we observe that ifn≥ 4 andMis compact connectedn-dimensional manifold with a traingulation, or a spine, satisfying this property, then the interior of the universal cover ofMis homeomorphic to Euclideann-space.