The effect of post-meal walking on 24-hour central blood pressure in young women with and without excess adiposity

Post-meal walking (PMW) performed after breakfast, lunch, and dinner has been demonstrated to reduce blood glucose. However, no studies have examined the potential additive benefits of post-meal walking exercise on daytime central blood pressure (BP) in young women. METHODS: Thirteen physically inactive, non-hypertensive women (Age: 20±1 years; percent body fat: 28.2±13%) completed the study during the early follicular or placebo phase of their contraceptive cycle. Participants completed a control day (CON; no exercise/excess physical activity) and PMW day (3 bouts x 15 minutes of brisk walking) over five days in random order. Daytime ambulatory BP and accelerometry data (to estimate METs) were measured and compared. RESULTS: PMW increased metabolic expenditure (PMW= 35.8±1.44 vs. CON= 33.7±0.94 METs, p0.05 for all). CONCLUSION: PMW does not lead to reductions in central BP in young, physically inactive women

Integrable Systems in Stringy Gravity

Static axisymmetric Einstein-Maxwell-Dilaton and stationary axisymmetric Einstein-Maxwell-Dilaton-Axion (EMDA) theories in four space-time dimensions are shown to be integrable by means of the inverse scattering transform method. The proof is based on the coset-space representation of the 4-dim theory in a space-time admitting a Killing vector field. Hidden symmetry group of the four-dimensional EMDA theory, unifying T and S string dualities, is shown to be Sp(2, R) acting transitively on the coset Sp(2, R)/U(2). In the case of two-parameter Abelian space-time isometry group, the hidden symmetry is the corresponding infinite-dimensional group of the Geroch-Kinnersley-Chitre type.Comment: 8 pages, LATEX, MSU-DTP-94/21, October 9

Twisted Self-Duality of Dimensionally Reduced Gravity and Vertex Operators

The Geroch group, isomorphic to the SL(2,R) affine Kac-Moody group, is an infinite dimensional solution generating group of Einstein's equations with two surface orthogonal commuting Killing vectors. We introduce another solution generating group for these equations, the dressing group, and discuss its connection with the Geroch group. We show that it acts transitively on a dense subset of moduli space. We use a new Lax pair expressing a twisted self-duality of this system and we study the dressing problem associated to it. We also describe how to use vertex operators to solve the reduced Einstein's equations. In particular this allows to find solutions by purely algebraic computations.Comment: 33 pages, LaTeX, Bonne Ann\'e

PELATIHAN PENGEMBANGAN CONTENT E-LEARNING UNTUK GURU IPA SE-JALUKO

ABSTRAKDalam proses pembelajaran, guru dituntut dalam memilih metode yang tepat. Apabila metode pembelajaran yang digunakan bersifat konvensional maka dapat menurunkan semangat dan minat belajar siswa di sekolah. Permasalahan dalam pembelajaran di sekolah sering ditemui khususnya ketika siswa mengalami kesulitan dalam belajar. Solusi dari permasalahan tersebut adalah dengan melaksanakan pembelajaran yang lebih menarik menggunakan media e-learning berbasis edmodo.Tujuan utama dari media ini adalah untuk meningkatkan aktivitas dalam pembelajaran karena edmodo hampir sama dengan facebook sehingga diharapkan dengan penggunaan edmodo siswa akan lebih merasa senang dalam pembelajaran fisika dan materi akan lebih mudah untuk dipahami. Tahap persiapan dimulai dari observasi di beberapa sekolah di Kecamatan Jambi Luar Kota untuk mengetahui sejauh mana penggunaan media pembelajaran oleh guru IPA serta koordinasi dengan MGMP IPA Rayon Jaluko Kab. Muaro Jambi, Provinsi Jambi. Tahap pelaksanaan yaitu pelatihan pengembangan content e-learning untuk pembelajaran IPA menggunakan edmoda. Hasil pengabdian memperlihatkan guru antusias dalam mengikuti pelatihan pengembangan content e-learning. Beberapa pertanyaan diajukan guru terkait bagimana cara penggunaan edmoda. Secara keseluruhan dapat dikatakan tujuan pengabdian tercapai yaitu dengan ditandai dengan antusias guru, berbagai masalah pengembangan content e-learning dapat diselesaiakan dan guru dapat menggunakan edmoda dengan baik dan benar. Kata kunci: e-learning, edmodo, Pembelajaran IPA. ABSTRACTIn the learning process, teachers are required to choose the right method. If the learning method used is conventioanl, it can reduce student’s enthusiasm and interest in learning at school. Problem in learning at school are often encountered especially when students experience learning difficulties. The solution to these problem is to carry out more interesting learning using edmodo based e-learning media. The main pupose of this media is to increase learning activities because edmodo is almost the same as facebook so hopefully with use of edmodo students will be more happy in physics learning and material will be easier to understand. The preparation phase start from obeservation in several school in the district of Jambi Luar Kota to find out the extent of the use of learning media by science teachers as well as coordination with the MGMP IPA Rayon Jaluko Districts Muaro Jambi, Jambi  Province. The implementation phase is training in developing e-learning content for science learning using edmodo. The result of community service show that the teacher is enthusiastic in participating in training in developing e-learning content. Some questions were raised by teacher regarding how to use edmodo. As a whole, it can be said that purpose of community service is achieved, which is marked by the enthusiasm of the teacher, various problem in developing e-learning content can be completed and the the teacher can be use edmodo properly and correcly. Keywords: e-learning, edmodo, science learnin

Geroch--Kinnersley--Chitre group for Dilaton--Axion Gravity

Kinnersley--type representation is constructed for the four--dimensional Einstein--Maxwell--dilaton--axion system restricted to space--times possessing two non--null commuting Killing symmetries. New representation essentially uses the matrix--valued $SL(2,R)$ formulation and effectively reduces the construction of the Geroch group to the corresponding problem for the vacuum Einstein equations. An infinite hierarchy of potentials is introduced in terms of $2\times 2$ real symmetric matrices generalizing the scalar hierarchy of Kinnersley--Chitre known for the vacuum Einstein equations.Comment: Published in ``Quantum Field Theory under the Influence of External Conditions'', M. Bordag (Ed.) (Proc. of the International Workshop, Leipzig, Germany, 18--22 September 1995), B.G. Teubner Verlagsgessellschaft, Stuttgart--Leipzig, 1996, pp. 228-23

Harrison transformation of hyperelliptic solutions and charged dust disks

We use a Harrison transformation on solutions to the stationary axisymmetric Einstein equations to generate solutions of the Einstein-Maxwell equations. The case of hyperelliptic solutions to the Ernst equation is studied in detail. Analytic expressions for the metric and the multipole moments are obtained. As an example we consider the transformation of a family of counter-rotating dust disks. The resulting solutions can be interpreted as disks with currents and matter with a purely azimuthal pressure or as two streams of freely moving charged particles. We discuss interesting limiting cases as the extreme limit where the charge becomes identical to the mass, and the ultrarelativistic limit where the central redshift diverges.Comment: 20 pages, 9 figure

Regular solutions to higher order curvature Einstein--Yang-Mills systems in higher dimensions

We study regular, static, spherically symmetric solutions of Yang-Mills theories employing higher order invariants of the field strength coupled to gravity in $d$ dimensions. We consider models with only two such invariants characterised by integers $p$ and $q$. These models depend on one dimensionless parameter $\alpha$ leading to one-parameter families of regular solutions, obtainable by numerical solution of the corresponding boundary value problem. Much emphasis is put on an analytical understanding of the numerical results.Comment: 34 pages, 12 figure

Integrability in Theories with Local U(1) Gauge Symmetry

Using a recently developed method, based on a generalization of the zero curvature representation of Zakharov and Shabat, we study the integrability structure in the Abelian Higgs model. It is shown that the model contains integrable sectors, where integrability is understood as the existence of infinitely many conserved currents. In particular, a gauge invariant description of the weak and strong integrable sectors is provided. The pertinent integrability conditions are given by a U(1) generalization of the standard strong and weak constraints for models with two dimensional target space. The Bogomolny sector is discussed, as well, and we find that each Bogomolny configuration supports infinitely many conserved currents. Finally, other models with U(1) gauge symmetry are investigated.Comment: corrected typos, version accepted in J. Phys.

Two-loop finiteness of D=2 supergravity

We establish two-loop (on shell) finiteness of certain supergravity theories in two dimensions. Possible implications of this result are discussedComment: 11 page

Chiral models in dilaton-Maxwell gravity

We study symmetry properties of the Einstein-Maxwell theory nonminimaly coupled to the dilaton field. We consider a static case with pure electric (magnetic) Maxwell field and show that the resulting system becomes a nonlinear sigma-model wich possesses a chiral representation. We construct the corresponding chiral matrix and establish a representation which is related to the pair of Ernst-like potentials. These potentials are used for separation of the symmetry group into the gauge and nongauge (charging) sectors. New variables, which linearize the action of charging symmetries, are also established; a solution generation technique based on the use of charging symmetries is formulated. This technique is used for generation of the elecricaly (magneticaly) charged dilatonic fields from the static General Relativity ones.Comment: 9 pages in LaTex; published in Gen. Rel. Grav. 32 (2000) pp 1389-139