Broadband dielectric response of glycerol and propylene carbonate: a comparison

Dielectric data on glycerol and propylene carbonate covering 18 decades of frequency are presented and compared to each other. Both materials exhibit qualitatively similar behavior except for marked differences in the high-frequency region just below the boson peak. The results on both materials are consistent with the mode coupling theory of the glass transition.Comment: 8 pages including 4 figure

HUBUNGAN BEBERAPA FAKTOR AKSEPTOR DENGAN KEPATUHAN KB SUNTIK DI KELURAHAN TLOGOSARI KULON, KOTA SEMARANG JANUARI-JULI 2015

Kepatuhan merupakan ketepatan dan kesadaran akseptor dalam melakukan suntik ulang tanpa ada paksaan dari orang lain. Kepatuhan penggunaan KB suntik digunakan untuk dapat mencegah terjadi kehamilan karena di Indonesia pertambahan penduduk terus meningkat setiap tahunnya. Pertambahan penduduk berhubungan dengan jumlah kelahiran, pemerintah mempunyai target pada tahun 2015 angka Total Fertility Rate (TFR) yaitu 2,3. Berdasarkan SDKI 2012 angka TFR di Provinsi Jawa Tengah sekitar 2,6. Masalah ditemukan di Kelurahan Tlogosari Kulon adalah ketidakpatuhan ibu terhadap KB suntik dikarenakan tidak sesuai dengan jadwal yang sudah ditentukan petugas kesehatan Tujuan dari penelitian ini Menganalisis hubungan beberapa faktor akseptor dengan kepatuhan KB suntik di Kelurahan Tlogosari Kulon. Jenis penelitian yang digunakan adalah Explanatory Research dengan pendekatan Cross Sectional Study. Populasi penelitian adalah 1012 orang dengan proporsi teknik simple random sampling dengan sampel yang digunakan 101 orang. Analisis data terdiri dari analisis univariat, analisis bivariat deskriptif (crosstab), bivariat analitik (Koreksi Yate), serta analisis multivariate (Logistic Multiple Regression). Hasil analisis univariat menunjukkan bahwa persentase responden terbanyak yaitu pendidikan lanjut (82,2%),bekerja (53,5%),pengetahuan baik (59,4%), dukungan suami yang mendukung (71,3%),sikap mendukung (57,4%), dan kepatuhan KB suntik yang tidak patuh (52,5%). Hasil analisis bivariat menunjukkan bahwa ada hubungan pengetahuan (pvalue = 0,043; OR = 2,52), dukungan suami (pvalue = 0,020; OR = 3,28), sikap (pvalue = 0,001; OR = 9,72) dengan kepatuhan KB suntik. Hasil analisis multivariate menunjukkan bahwa diantara faktor-faktor yang diteliti yang berpengaruh hanya sikap dengan OR (Exp{B}) sebesar 9,72. Disarankan kepada petugas kesehatan untuk memberikan penyuluhan dan pendidikan kesehatan kepatuhan KB suntik dalam upaya meningkatkan pengetahuan pada akseptor, komunikasi interpersonal dan berdiskusi dengan lebih terbuka sehingga penerimaan dan pemahaman informasi di kalangan mereka akan lebih baik dan mengadakan KIE tentang kepatuhan KB suntik Kata Kunci: Kepatuhan KB suntik, Beberapa faktor aksepto

Top quark spin correlations at hadron colliders: Predictions at next-to-leading order QCD

The collider experiments at the Tevatron and the LHC will allow for detailed investigations of the properties of the top quark. This requires precise predictions of the hadronic production of $t\bar t$ pairs and of their subsequent decays. In this Letter we present for the reactions $p {\bar p}, p p \to t{\bar t} + X \to \ell^+\ell'^-X$ the first calculation of the dilepton angular distribution at next-to-leading order (NLO) in the QCD coupling, keeping the full dependence on the spins of the intermediate $t\bar{t}$ state. The angular distribution reflects the degree of correlation of the $t$ and $\bar t$ spins which we determine for different choices of $t$ and $\bar t$ spin bases. In the case of the Tevatron, the QCD corrections are sizeable, and the distribution is quite sensitive to the parton content of the proton.Comment: 9 pages, 2 figure

Top Quark Pair Production and Decay including Spin Effects at Hadron Colliders: Predictions at NLO QCD

Top quark-antiquark ($t\bar t$) pairs will be produced copiously at the Tevatron collider and in huge numbers at the LHC. This will make possible detailed investigations of the properties and interactions of this quark flavor. The analysis and interpretation of future data requires precise predictions of the hadronic production of $t\bar t$ pairs and of their subsequent decays. In this talk the reactions $p {\bar p}, p p \to t{\bar t} + X \to l^+ l'^- + X$ are considered and results are presented of our calculation of the dilepton angular distribution at next-to-leading order QCD, keeping the full dependence on the spins of the intermediate $t\bar{t}$ state. The angular distribution is determined for different choices of reference axes that can be identified with the $t$ and $\bar t$ spin axes. While the QCD corrections to the leading-order distribution turn out to be small in the case of the LHC, we find them to be sizeable in the case of the Tevatron and find, moreover, the angular distribution to be sensitive to the parton content of the proton.Comment: Talk given at 3rd Circum-Pan-Pacific Symposium on "High Energy Spin Physics", Beijing, China, 8-13, 200

A Survey on Retrieval of Mathematical Knowledge

We present a short survey of the literature on indexing and retrieval of mathematical knowledge, with pointers to 72 papers and tentative taxonomies of both retrieval problems and recurring techniques.Comment: CICM 2015, 20 page

Atomistic studies of transformation pathways and energetics in plutonium

One of the most challenging problems in understanding the structural phase transformations in Pu is to determine the energetically favored, continuous atomic pathways from one crystal symmetry to another. This problem involves enumerating candidate pathways and studying their energetics to garner insight into instabilities and energy barriers. The purpose of this work is to investigate the energetics of two transformation pathways for the delta to alpha' transformation in Pu that were recently proposed [Lookman et al., Phys. Rev. Lett. 100:145504, 2008] on the basis of symmetry. These pathways require the presence of either an intermediate hexagonal closed-packed (hcp) structure or a simple hexagonal (sh) structure. A subgroup of the parent fcc and the intermediate hexagonal structure, which has trigonal symmetry, facilitates the transformation to the intermediate hcp or sh structure. Phonons then break the translational symmetry from the intermediate hcp or sh structure to the final monoclinic symmetry of the alpha' structure. We perform simulations using the modified embedded atom method (MEAM) for Pu to investigate these candidate pathways. Our main conclusion is that the path via hcp is energetically favored and the volume change for both pathways essentially occurs in the second step of the transformation, i.e. from the intermediate sh or hcp to the monoclinic structure. Our work also highlights the deficiency of the current state-of-the-art MEAM potential in capturing the anisotropy associated with the lower symmetry monoclinic structure.Comment: 12 pages, 5 figures, accepted for publication in Philos. Ma

Half-integral weight p-adic coupling of weakly holomorphic and holomorphic modular forms

published_or_final_versio

Matching NLO QCD and parton showers in heavy flavour production

We apply the MC@NLO approach to the process of heavy flavour hadroproduction. MC@NLO is a method for matching next-to-leading order (NLO) QCD calculations and parton shower Monte Carlo (MC) simulations, with the following features: fully exclusive events are generated, with hadronisation according to the MC model; total rates are accurate to NLO; NLO results for distributions are recovered upon expansion in \as; hard emissions are treated as in NLO computations while soft/collinear emissions are handled by the MC simulation, with the same logarithmic accuracy as the MC; matching between the hard and soft regions is smooth, and no intermediate integration steps are necessary. The method was applied previously to the hadroproduction of gauge boson pairs, which at NLO involves only initial-state QCD radiation and a unique colour structure. In heavy flavour production, it is necessary to include contributions from final-state QCD radiation and different colour flows. We present illustrative results on top and bottom production at the Tevatron and LHC

Grey matter volume correlates with virtual water maze task performance in boys with androgen excess

Major questions remain about the specific role of testosterone in human spatial navigation. We tested 10 boys (mean age 11.65 years) with an extremely rare disorder of androgen excess (Familial Male Precocious Puberty, FMPP) and 40 healthy boys (mean age 12.81 years) on a virtual version of the Morris Water Maze task. In addition, anatomical magnetic resonance images were collected for all patients and a subsample of the controls (n=21) after task completion. Behaviourally, no significant differences were found between both groups. However, in the MRI analyses, grey matter volume (GMV) was correlated with performance using voxel-based morphometry (VBM). Group differences in correlations of performance with GMV were apparent in medial regions of the prefrontal cortex as well as the middle occipital gyrus and the cuneus. By comparison, similar correlations for both groups were found in the inferior parietal lobule. These data provide novel insight into the relation between testosterone and brain development and suggest that morphological differences in a spatial navigation network covary with performance in spatial ability. Published by Elsevier Ltd on behalf of IBRO