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Search Results: 1 - 10 of 490143 matches for " M. F. Newman "
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Graded Lie Algebras of Maximal Class II
A. Caranti,M. F. Newman
Mathematics , 1999,
Abstract: We describe the isomorphism classes of infinite-dimensional graded Lie algebras of maximal class, generated by elements of weight one, over fields of odd characteristic.
On complexity of multiplication in finite soluble groups
M. F. Newman,Alice C. Niemeyer
Mathematics , 2014,
Abstract: We determine a reasonable upper bound for the complexity of collection from the left to multiply two elements of a finite soluble, or polycyclic, group by restricting attention to certain polycyclic presentations of the group.
Influence of Peer Pressure and Self-Efficacy for Alcohol Self-Regulation on Chinese University Physical Education Students’ Drinking Behaviors  [PDF]
Lanyan Ding, Ian M. Newman, Eric S. Buhs, Duane F. Shell
Advances in Physical Education (APE) , 2018, DOI: 10.4236/ape.2018.81006
Abstract: This study examined peer group influence on university student drinking in China and the indirect effects of peer pressure and self-efficacy for alcohol self-regulation. A total of 951 undergraduate university students (first, second and third year) from a university in central China completed questionnaires asking about perceived peer pressures, self-efficacy for alcohol self-regulation, and drinking frequency. Analysis of their answers showed that the drinking frequency among physical education (PE) students was higher than among the comparison group (History students). The PE students perceived greater peer pressure, and had lower self-efficacy for alcohol self-regulation, both of which contributed directly to drinking frequency. Path analysis indicated indirect effects of peer pressure and self-efficacy for alcohol self-regulation on the association between peer group membership and drinking frequency. This?suggested that skills training to increase self-efficacy for alcohol self-regulation in culturally-specific settings have the potential to both directly and indirectly lower drinking rates in peer groups with high peer pressure and higher than normal drinking.
Effect of a Comprehensive Health Education Program to Increase Physical Activity among Primary School Students in China  [PDF]
Ling Qian, Lok-Wa Yuen, Yonghua Feng, Ian M. Newman, Duane F. Shell, Weijing Du
Advances in Physical Education (APE) , 2018, DOI: 10.4236/ape.2018.82018
Abstract: China’s National Physical Fitness and Health Surveillance (NPFHS) survey revealed high levels of sedentary behavior among primary school-aged children. Sedentary behavior is linked to both short-term and long-term physical and mental health conditions. A comprehensive school health education program was designedand its effectiveness to raise physical activity levels in Grade 4 primary school children was evaluated. Twelve schools (6?of?program, 6?of?control) from six cities in two economically different provinces were selected. Students at program schools received physical activity instruction both in and out of school. Control schools carried on with their usual level of physical activity for students, as required by national educational standards. Program effectiveness was assessed by comparing students’ physical activity behaviors at pre- and post-program, and by comparing students’ physical activity scores at program schools with students’ scores at control schools. The pre-program survey of students’ behaviors was done at the end of Grade 3, and the post-program survey was done at the end of Grade 4. Multi-level modeling was used to evaluate program effectiveness to allow for missing data.Results from 4472 students showed at pre-program there was no difference in control and program schools’ student physical activity scores. At post-program students in program schools did significantly more physical activity compared to students in control schools. Students in program schools were more physically active after the comprehensive school health education program.A school-based comprehensive health education program would effectively increase childrens physical activity level in China. There is a potential to reduce sedentary behavior among children by implementing school programs that are environmental in nature; that is, activities involve not only the students,?but also the school administration, teachers, parents, and community?members.
The Scaling Limit Geometry of Near-Critical 2D Percolation
F. Camia,L. R. G. Fontes,C. M. Newman
Mathematics , 2005, DOI: 10.1007/s10955-005-9014-6
Abstract: We analyze the geometry of scaling limits of near-critical 2D percolation, i.e., for $p=p_c+\lambda\delta^{1/\nu}$, with $\nu=4/3$, as the lattice spacing $\delta \to 0$. Our proposed framework extends previous analyses for $p=p_c$, based on $SLE_6$. It combines the continuum nonsimple loop process describing the full scaling limit at criticality with a Poissonian process for marking double (touching) points of that (critical) loop process. The double points are exactly the continuum limits of "macroscopically pivotal" lattice sites and the marked ones are those that actually change state as $\lambda$ varies. This structure is rich enough to yield a one-parameter family of near-critical loop processes and their associated connectivity probabilities as well as related processes describing, e.g., the scaling limit of 2D minimal spanning trees.
Two-Dimensional Scaling Limits via Marked Nonsimple Loops
F. Camia,L. R. G. Fontes,C. M. Newman
Mathematics , 2006,
Abstract: We postulate the existence of a natural Poissonian marking of the double (touching) points of SLE(6) and hence of the related continuum nonsimple loop process that describes macroscopic cluster boundaries in 2D critical percolation. We explain how these marked loops should yield continuum versions of near-critical percolation, dynamical percolation, minimal spanning trees and related plane filling curves, and invasion percolation. We show that this yields for some of the continuum objects a conformal covariance property that generalizes the conformal invariance of critical systems. It is an open problem to rigorously construct the continuum objects and to prove that they are indeed the scaling limits of the corresponding lattice objects.
Clusters and Recurrence in the Two-Dimensional Zero-Temperature Stochastic Ising Model
F. Camia,E. De Santis,C. M. Newman
Mathematics , 2001,
Abstract: We analyze clustering and (local) recurrence of a standard Markov process model of spatial domain coarsening. The continuous time process, whose state space consists of assignments of +1 or -1 to each site in ${\bf Z}^2$, is the zero-temperature limit of the stochastic homogeneous Ising ferromagnet (with Glauber dynamics): the initial state is chosen uniformly at random and then each site, at rate one, polls its 4 neighbors and makes sure it agrees with the majority, or tosses a fair coin in case of a tie. Among the main results (almost sure, with respect to both the process and initial state) are: clusters (maximal domains of constant sign) are finite for times $t< \infty$, but the cluster of a fixed site diverges (in diameter) as $t \to \infty$; each of the two constant states is (positive) recurrent. We also present other results and conjectures concerning positive and null recurrence and the role of absorbing states.
Viability of Titanium-Titanium Boride Composite as a Biomaterial
F. M. Makau,K. Morsi,N. Gude,R. Alvarez,M. Sussman,K. May-Newman
ISRN Biomaterials , 2013, DOI: 10.5402/2013/970535
Abstract: The use of reinforcements to enhance mechanical properties of titanium such as hardness has been adopted by many researchers. Of these reinforcements, titanium boride has emerged as one of the most suitable reinforcements for titanium which is both chemically and mechanically compatible with the titanium matrix. Despite the extensive work conducted on these types of composites, very little is known about their biocompatibility which has so far precluded their use in bioapplications. The present paper investigates, for the first time, the biocompatibility of powder-processed titanium-titanium boride ( ) composites for use in medical and dental implants and basic studies on fibroblast attachment conducted to assess for this application. The work is intended to serve as an initial step towards understanding the bioresponse of these composites by evaluating cytotoxicity, cellular attachment and morphology, and hemolytic potential. Results indicate that fibroblasts attach, proliferate, and achieve confluency when in contact with the composites, exhibiting normal morphology. Furthermore, the cells show a favorable growth rate when cultured with the composite for 48 hours. The composite demonstrated excellent blood biocompatibility, with a low hemolysis level (0.12% ) when compared with CP Ti (0.17%) and Ti-6Al-4V (0.36%). These findings suggest that composite is biocompatible and further investigation into its suitability as a biomaterial should be considered. 1. Introduction Medical implants present a challenging set of mechanical and biocompatibility requirements. These devices must withstand large torques, compressive and shear forces during their normal loading conditions and require strong wear-resistant materials for good mechanical force transfer. Biological integration of the implant requires biocompatibility with both hard and soft tissues and prevention of bacterial adhesion, infection, and blood hemolysis [1]. Titanium (Ti) alloys such as Ti-6Al-4V and commercially pure titanium (CP Ti) have been widely used in medical implants due to their excellent biocompatibility and mechanical properties [2]. However, problems such as wear particle generation and the associated inflammatory response present a need for further improvement for biomedical applications [3]. Titanium composites present a viable solution and provide many benefits in terms of property improvements compared with unreinforced Ti. However, the search for a suitable reinforcement material for the titanium matrix that is both mechanically and chemically compatible had been a major
The extracellular matrix, p53 and estrogen compete to regulate cell-surface Fas/Apo-1 suicide receptor expression in proliferating embryonic cerebral cortical precursors, and reciprocally, Fas-ligand modifies estrogen control of cell-cycle proteins
Zulfiqar F Cheema, Daniel R Santillano, Stephen B Wade, Joseph M Newman, Rajesh C Miranda
BMC Neuroscience , 2004, DOI: 10.1186/1471-2202-5-11
Abstract: Flow-cytometric analyses identified two distinct neural sub-populations that expressed Fas on their cell surface at high (FasHi) or moderate (FasMod) levels. The anti-apoptotic protein FLIP further delineated a subset of Fas-expressing cells with potential apoptosis-resistance. FasMod precursors were mainly in G0, while FasHi precursors were largely apoptotic. However, birth-date analysis indicated that neuroblasts express the highest levels of cell-surface Fas at the end of S-phase, or after their final round of mitosis, suggesting that Fas expression is induced at cell cycle checkpoints or during interkinetic nuclear movements. FasHi expression was associated with loss of cell-matrix adhesion and anoikis. Activation of the transcription factor p53 was associated with induction of Fas expression, while the gonadal hormone estrogen antagonistically suppressed cell-surface Fas expression. Estrogen also induced entry into S-phase and decreased the number of Fas-expressing neuroblasts that were apoptotic. Concurrent exposure to estrogen and to soluble Fas-ligand (sFasL) suppressed p21/waf-1 and PCNA. In contrast, estrogen and sFasL, individually and together, induced cyclin-A expression, suggesting activation of compensatory survival mechanisms.Embryonic cortical neuronal precursors are intrinsically heterogeneous with respect to Fas suicide-sensitivity. Competing intrinsic (p53, cell cycle, FLIP expression), proximal (extra-cellular matrix) and extrinsic factors (gonadal hormones) collectively regulate Fas suicide-sensitivity either during neurogenesis, or possibly during neuronal migration, and may ultimately determine which neuroblasts successfully contribute neurons to the differentiating cortical plate.The developing cerebral cortex and other brain regions undergo substantial cell suicide during the period of neurogenesis and early differentiation [1-10], to generate a mature brain. Mechanisms that control the survival or death of neuroblasts and neurons in the de
Laboratory evaluation on the sensitivity and specificity of a novel and rapid detection method for malaria diagnosis based on magneto-optical technology (MOT)
Petra F Mens, Raphael J Matelon, Bakri YM Nour, Dave M Newman, Henk DFH Schallig
Malaria Journal , 2010, DOI: 10.1186/1475-2875-9-207
Abstract: Blood samples of confirmed malaria patients from different regions of Africa, patients with other diseases and healthy non-endemic controls were used in the present study. The samples were analysed with two reference tests, i.e. an histidine rich protein-2 based rapid diagnostic test (RDT) and a conventional Pan-Plasmodium PCR, and the MOT as index test. Data were entered in 2 × 2 tables and analysed for sensitivity and specificity. The agreement between microscopy, RDT and PCR and the MOT assay was determined by calculating Kappa values with a 95% confidence interval.The observed sensitivity/specificity of the MOT test in comparison with clinical description, RDT or PCR ranged from 77.2 - 78.8% (sensitivity) and from 72.5 - 74.6% (specificity). In general, the agreement between MOT and the other assays is around 0.5 indicating a moderate agreement between the reference and the index test. However, when RDT and PCR are compared to each other, an almost perfect agreement can be observed (k = 0.97) with a sensitivity and specificity of >95%.Although MOT sensitivity and specificity are currently not yet at a competing level compared to other diagnostic test, such as PCR and RDTs, it has a potential to rapidly screen patients for malaria in endemic as well as non-endemic countries.Initiation of malaria treatment largely depends on good, laboratory confirmed diagnosis. However, in many disease endemic countries clinical diagnosis is the only method used to decide whether or not to treat, since laboratory techniques to confirm the clinical suspicion are considered to be too labour-intensive or not sensitive enough [1,2]. In general, screening of blood slides by microscopy is still considered to be the "gold standard". This method is cheap and simple but labour intensive, time consuming and requires well-trained personnel that can differentiate between the different Plasmodium species [3]. In recent years, a variety of rapid diagnostic tests (RDTs), detecting circulating P
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