cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
The Computation of All 4R Serial Spherical Wrists With an Isotropic Architecture
Creators: name: Chablat, Damien
name: Angeles, Jorge
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: A spherical wrist of the serial type with n revolute (R) joints is said to be isotropic if it can attain a posture whereby the singular values of its Jacobian matrix are all equal to sqrt(n/3). What isotropy brings about is robustness to manufacturing, assembly, and measurement errors, thereby guaranteeing a maximum orientation accuracy. In this paper we investigate the existence of redundant isotropic architectures, which should add to the dexterity of the wrist under design by virtue of its extra degree of freedom. The problem formulation, for, leads to a system of eight quadratic equations with eight unknowns. The Bezout number of this system is thus 2^8=256, its BKK bound being 192. However, the actual number of solutions is shown to be 32. We list all solutions of the foregoing algebraic problem. All these solutions are real, but distinct solutions do not necessarily lead to distinct manipulators. Upon discarding those algebraic solutions that yield no new wrists, we end up with exactly eight distinct architectures, the eight corresponding manipulators being displayed at their isotropic postures.
Quasienergy anholonomy and its application to adiabatic quantum state manipulation
Creators: name: Tanaka, Atushi
name: Miyamoto, Manabu
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The parametric dependence of a quantum map under the influence of a rank-1 perturbation is investigated. While the Floquet operator of the map and its spectrum have a common period with respect to the perturbation strength $λ$, we show an example in which none of the quasienergies nor the eigenvectors obey the same period: After a periodic increment of $λ$, the quasienergy arrives at the nearest higher one, instead of the initial one, exhibiting an anholonomy, which governs another anholonomy of the eigenvectors. An application to quantum state manipulations is outlined.
description: 10pages, 1figure. To be published in Phys. Rev. Lett.
Ab initio relativistic many-body calculation of hyperfine splitting of ^{113}Cd^+
Creators: name: Dixit, Gopal
name: Nataraj, H. S.
name: Sahoo, B. K.
name: Chaudhuri, R. K.
name: Majumder, Sonjoy
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: Computational Physics (physics.comp-ph)
subject: FOS: Physical sciences

description: This work presents accurate ab initio determination of the hyperfine splitting for the ground state and few low-lying excited states of 113Cd+; important candidates for the frequency standard in the microwave region, using coupled-cluster theory (CC) in the relativistic framework. The calculated hyperfine splitting are well in agreement with recent experimental results. We have also carried out the lifetimes of the 5p2P1=2 and 5p2P3=2 states, which are in well agreement with recent experimental result (Moehring et al., PRA 73 023413, 2006). The roles of different electron correlation effects in the determination of these quantities are discussed and their contributions are presented in the CC terms.
description: 8 pages, 1 figure
การปรับตัวของเกษตรกรผู้ปลูกข้าวต่อสถานการณ์ภัยแล้งในอำเภอเมือง จังหวัดลพบุรี
Creators: name: เฉลิมพล  จตุพร
Publisher: name: คณะเทคโนโลยีการเกษตร  มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2017
Subjects: ภัยแล้ง
เกษตรกรผู้ปลูกข้าว
ลพบุรี
การถดถอยพหุคูณ

description: วารสารเกษตรพระวรุณ, 14, 2, 191-198
การปรับปรุงประสิทธิภาพการกำกับดูแลร้านจำหน่ายวัตถุอันตรายทางการเกษตรเพื่อลดปัญหาสารพิษตกค้างในสินค้าเกษตร
Creators: name: สรา  อาภรณ์
Publisher: name: คณะเทคโนโลยีการเกษตร  มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2017
Subjects: ร้านจำหน่ายวัตถุอันตรายทางเกษตร
การปนเปื้อนของสารเคมีเกษตร
การจัดการสารเคมี

description: วารสารเกษตรพระวรุณ, 14, 2, 199-207
ผลของสารสกัดสมุนไพรต่อการตายของตัวอ่อนพยาธิในกลุ่ม strongylesของแพะ
Creators: name: ดวงใจ บุญกุศล
Publisher: name: คณะเทคโนโลยีการเกษตร  มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2017
Subjects: แพะ
พยาธิตัวกลมในกลุ่ม strongyles
สารสกัดสมุนไพร

description: วารสารเกษตรพระวรุณ, 14, 2, 208-216
title: Mit dem Glasfaserkabel Erdbeben erfassen
Creators: name: Krawczyk, Charlotte M.
name: Jorzik, Oliver
Publisher: name: Deutsches GeoForschungsZentrum GFZ
Year: 2018

description: Durch das Verfahren des „Distributed Acoustic Sensing“ könnten weltweit Glasfasernetze genutzt werden, um Erdbeben zu erfassen und metergenau zu lokalisieren. Dies wäre eine kostengünstige Alternative gegenüber bisherigen Methoden, bei denen komplexe Seismometer-Netze verwendet werden. Zudem haben die erfassten Daten eine hohe Qualität.
Conformal Structures in Noncommutative Geometry
Creators: name: Baer, Christian
Publisher: name: arXiv
Year: 2007
Subjects: subject: Differential Geometry (math.DG)
subject: FOS: Mathematics
subject: 58B34; 53C27; 53A30

description: It is well-known that a compact Riemannian spin manifold can be reconstructed from its canonical spectral triple which consists of the algebra of smooth functions, the Hilbert space of square integrable spinors and the Dirac operator. It seems to be a folklore fact that the metric can be reconstructed up to conformal equivalence if one replaces the Dirac operator D by sign(D). We give a precise formulation and proof of this fact.
description: 8 pages, published version
Backward scattering of low-energy antiprotons by highly charged and neutral uranium: Coulomb glory
Creators: name: Maiorova, A. V.
name: Telnov, D. A.
name: Shabaev, V. M.
name: Tupitsyn, I. I.
name: Plunien, G.
name: Stöhlker, T.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Atomic Physics (physics.atom-ph)
subject: FOS: Physical sciences

description: Collisions of antiprotons with He-, Ne-, Ni-like, bare, and neutral uranium are studied theoretically for scattering angles close to 180$^{\circ}$ and antiproton energies with the interval 100 eV -- 10 keV. We investigate the Coulomb glory effect which is caused by a screening of the Coulomb potential of the nucleus and results in a prominent maximum of the differential cross section in the backward direction at some energies of the incident particle. We found that for larger numbers of electrons in the ion the effect becomes more pronounced and shifts to higher energies of the antiproton. On the other hand, a maximum of the differential cross section in the backward direction can also be found in the scattering of antiprotons on a bare uranium nucleus. The latter case can be regarded as a manifestation of the screening property of the vacuum-polarization potential in non-relativistic collisions of heavy particles.
description: 14 pages, 5 figures
Near-IR Spectra of Red Supergiants and Giants. I- Models with Solar and with Mixing-Induced Surface Abundance Ratios
Creators: name: Lançon, A.
name: Hauschildt, P. H.
name: Ladjal, D.
name: Mouhcine, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We provide a grid of PHOENIX spectra of red giant and supergiant stars, that extend through optical and near-IR wavelengths. For the first time, models are also provided with modified surface abundances of C, N and O, as a step towards accounting for the changes known to occur due to convective dredge-up (and to be enhanced in the case of rotation). The aims are (i) to assess how well current models reproduce observed spectra, (ii) to quantify the effects of the abundance changes on the spectra, and (iii) to determine how these changes affect estimates of fundamental stellar parameters. Observed giant star spectra can be fitted very well at solar metallicity down to about 3400K. Modified surface abundances are preferred in only a minority of cases for luminosity class II, possibly indicating mixing in excess of standard first dredge-up. Supergiant stars show a larger variety of near-IR spectra, and good fits are currently obtained for about one third of the observations only. Modified surface abundances help reproducing strong CN bands, but do not suffice to resolve all the difficulties. The effect of the abundance changes on the estimated Teff depends on the wavelength range of observation and can amount several 100K. Reasons for the remaining discrepancies are discussed.
description: To be published in A&A. 19 p., 35 postscript figures, uses aa.cls. Selected model spectra available through CDS
Nondecoupling of Heavy Fermions and a Special Yukawa Texture
Creators: name: Rebelo, M. N.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Talk based on work entitled ``Yukawa textures, new physics and nondecoupling,'' done in collaboration with G. C. Branco and J. I. Silva-Marcos, arXiv:hep-ph/0612252, to appear in Phys. Rev. D. In this work we pointed out that New Physics can play an important r\^ ole in rescuing some of the Yukawa texture zero ans\" atze which would otherwise be eliminated by the recent, more precise measurements of $V_{CKM}$. We have shown that the presence of an isosinglet vector-like quark which mixes with standard quarks, can render viable a particularly interesting four texture zero Yukawa ansatz. The crucial point is the nondecoupling of the effects of the isosinglet quark, even for arbitrary large values of its mass.
description: Invited talk at CTP Symposium on Supersymmetry at LHC: Theoretical and Experimental Prospectives, Cairo, Egypt, 11-14 Mar 2007
Justification of the coupled-mode approximation for a nonlinear elliptic problem with a periodic potential
Creators: name: Pelinovsky, Dmitry
name: Schneider, Guido
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Mathematical Physics (math-ph)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: Coupled-mode systems are used in physical literature to simplify the nonlinear Maxwell and Gross-Pitaevskii equations with a small periodic potential and to approximate localized solutions called gap solitons by analytical expressions involving hyperbolic functions. We justify the use of the one-dimensional stationary coupled-mode system for a relevant elliptic problem by employing the method of Lyapunov--Schmidt reductions in Fourier space. In particular, existence of periodic/anti-periodic and decaying solutions is proved and the error terms are controlled in suitable norms. The use of multi-dimensional stationary coupled-mode systems is justified for analysis of bifurcations of periodic/anti-periodic solutions in a small multi-dimensional periodic potential.
description: 18 pages, no figures
State-dependent diffusion: thermodynamic consistency and its path integral formulation
Creators: name: Lau, A. W. C.
name: Lubensky, T. C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: Statistical Mechanics (cond-mat.stat-mech)
subject: FOS: Physical sciences

description: The friction coefficient of a particle can depend on its position as it does when the particle is near a wall. We formulate the dynamics of particles with such state-dependent friction coefficients in terms of a general Langevin equation with multiplicative noise, whose evaluation requires the introduction of specific rules. Two common conventions, the Ito and the Stratonovich, provide alternative rules for evaluation of the noise, but other conventions are possible. We show the requirement that a particle's distribution function approach the Boltzmann distribution at long times dictates that a drift term must be added to the Langevin equation. This drift term is proportional to the derivative of the diffusion coefficient times a factor that depends on the convention used to define the multiplicative noise. We explore the consequences of this result in a number examples with spatially varying diffusion coefficients. We also derive path integral representations for arbitrary interpretation of the noise, and use it in a perturbative study of correlations in a simple system.
description: 18 pages, 8 figures, Accepted to PRE
Nonadditive quantum error-correcting code
Creators: name: Yu, Sixia
name: Chen, Qing
name: Lai, C. H.
name: Oh, C. H.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We report the first nonadditive quantum error-correcting code, namely, a $((9,12,3))$ code which is a 12-dimensional subspace within a 9-qubit Hilbert space, that outperforms the optimal stabilizer code of the same length by encoding more levels while correcting arbitrary single-qubit errors.
description: 1 eps figure
Dynamics of bacterial flow: Emergence of spatiotemporal coherent structures
Creators: name: Sambelashvili, Nicholas
name: Lau, A. W. C.
name: Cai, David
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: We propose a simple model of self-propelled particles to show that coherent structures, such as jets and swirls, can arise from a plausible microscopic mechanisms: (i) the elongated shape of the self-propelled particles with (ii) the hardcore interactions among them. We demonstrate via computer simulation that these coherent structures, which emerge at sufficiently high densities of particles, have characteristics that are similar to those observed in recent experiments in bacteria baths.
description: 5 pages, 4 figures
Moving gap solitons in periodic potentials
Creators: name: Pelinovsky, Dmitry
name: Schneider, Guido
Publisher: name: arXiv
Year: 2007
Subjects: subject: Analysis of PDEs (math.AP)
subject: Dynamical Systems (math.DS)
subject: Pattern Formation and Solitons (nlin.PS)
subject: FOS: Mathematics
subject: FOS: Physical sciences

description: We address existence of moving gap solitons (traveling localized solutions) in the Gross-Pitaevskii equation with a small periodic potential. Moving gap solitons are approximated by the explicit localized solutions of the coupled-mode system. We show however that exponentially decaying traveling solutions of the Gross-Pitaevskii equation do not generally exist in the presence of a periodic potential due to bounded oscillatory tails ahead and behind the moving solitary waves. The oscillatory tails are not accounted in the coupled-mode formalism and are estimated by using techniques of spatial dynamics and local center-stable manifold reductions. Existence of bounded traveling solutions of the Gross--Pitaevskii equation with a single bump surrounded by oscillatory tails on a finite large interval of the spatial scale is proven by using these technique. We also show generality of oscillatory tails in other nonlinear equations with a periodic potential.
description: 22 pages, 2 figures
ประสิทธิภาพของสารละลายน้ำมันกานพลูในการสลบปลาดุกรัสเซีย
Creators: name: พุทธชาติ อิ่มใจ
Publisher: name: คณะเทคโนโลยีการเกษตร  มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2017
Subjects: น้ำมันกานพลู
ยาสลบ
ปลาดุกรัสเซีย

description: วารสารเกษตรพระวรุณ, 14, 2, 217-224
The BFKL Pomeron Calculus in the dipole approach
Creators: name: Kozlov, M.
name: Levin, E.
name: Prygarin, A.
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: In this paper we continue to pursue a goal of finding an effective theory for high energy interaction in QCD based on the colour dipole approach, for which the BFKL Pomeron Calculus gives a low energy limit. The key problem, that we try to solve in this paper is the probabilistic interpretation of the BFKL Pomeron Calculus in terms of the colourless dipoles and their interactions. We demonstrate that the BFKL Pomeron Calculus has two equivalent descriptions : (i) one is the generating functional which gives a clear probabilistic interpretation of the processes of high energy scattering and also provides a Hamiltonian-like description of the system of interacting dipoles; (ii) the second is the Langevin equation with a specific noise term which is rather complicated. We found that at high energies this Langevin equation can be reduced to the Langevin equation for directed percolation in the momentum space if the impact parameter is large, namely, $b>> 1/k$, where $k$ is the transverse momentum of a dipole. Unfortunately, this simplified form of Langevin equation is not applicable for summation of Pomeron loops, where one integrates over all possible values of impact parameter. We show that the BFKL Pomeron calculus with two vertices (splitting $P\to P+P$ and merging $P+P\to P$ of Pomerons) can be interpreted as a system of colourless dipoles with two processes: the decay of one dipole into two and the merging of two dipoles into one dipole. However, a number of assumptions we have to make on the way to simplify the noise term in the Langevin equation and/or to apply the probabilistic interpretation, therefore, we can consider both of these approaches in the present form only as the QCD motivated models.
description: 28 pages, 3 figures
Spectropolarimetry of the Type Ib/c SN 2005bf
Creators: name: Maund, J. R.
name: Wheeler, J. C.
name: Patat, F.
name: Baade, D.
name: Wang, L.
name: Hoflich, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present spectropolarimetric observations of the peculiar Type Ib/c SN 2005bf, in MCG+00-27-005, from 3600-8550Å. The SN was observed on 2005 April 30.9, 18 days after the first B-band light-curve maximum and 6 days before the second B-band light-curve maximum. The degree of the Interstellar Polarization, determined from depolarized emission lines in the spectrum, is found to be large with $p_{max}(ISP)=1.6%$ and $θ(ISP)=149$\fdg$7\pm4.0$, but this may be an upper limit on the real value of the ISP. After ISP subtraction, significant polarization is observed over large wavelength regions, indicating a significant degree of global asymmetry, $\gtrsim 10%$. Polarizations of 3.5% and 4% are observed for absorption components of Ca II H&K and IR triplet, and 1.3% for He I 5876Åand Fe II. On the $Q-U$ plane clear velocity-dependent loop structure is observed for the He I 5876Åline, suggestive of departures from an axial symmetry and possible clumping of the SN ejecta. Weak High Velocity components of $\mathrm{Hα}$, $\mathrm{Hβ}$ and $\mathrm{Hγ}$ are observed, with velocities of -15 000\kms. The low degree of polarization observed at H$β$ suggests that the polarization observed for the other Balmer lines ($\sim 0.4%$ above the background polarization) may rather be due to blending of $\mathrm{Hα}$ and $\mathrm{Hγ}$ with polarized Si II and Fe II lines, respectively. We suggest a model in which a jet of material, that is rich in $\mathrm{^{56}Ni}$, has penetrated the C-O core, but not the He mantle. The jet axis is tilted with respect to the axis of the photosphere. This accounts for the lack of significant polarization of O I 7774Å, the delayed excitation and, hence, observability of He I and, potentially, the varied geometries of He and Ca.
description: 12 pages, 7 figures (3 colour), MNRAS accepted
Calculation of critical exponents by self-similar factor approximants
Creators: name: Yukalov, V. I.
name: Yukalova, E. P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Statistical Mechanics (cond-mat.stat-mech)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: The method of self-similar factor approximants is applied to calculating the critical exponents of the O(N)-symmetric phi^4 theory and of the Ising glass. It is demonstrated that this method, being much simpler than other known techniques of series summation in calculating the critical exponents, at the same time, yields the results that are in very good agreement with those of other rather complicated numerical methods. The principal advantage of the method of self-similar factor approximants is the combination of its extraordinary simplicity and high accuracy.
description: 17 pages, 2 tables
A design oriented study for 3R Orthogonal Manipulators With Geometric Simplifications
Creators: name: Zein, Mazen
name: Wenger, Philippe
name: Chablat, Damien
Publisher: name: arXiv
Year: 2007
Subjects: subject: Robotics (cs.RO)
subject: FOS: Computer and information sciences

description: This paper proposes a method to calculate the largest Regular Dextrous Workspace (RDW) of some types of three-revolute orthogonal manipulators that have at least one of their DH parameters equal to zero. Then a new performance index based on the RDW is introduced, the isocontours of this index are plotted in the parameter space of the interesting types of manipulators and finally an inspection of the domains of the parameter spaces is conducted in order to identify the better manipulator architectures. The RDW is a part of the workspace whose shape is regular (cube, cylinder) and the performances (conditioning index) are bounded inside. The groups of 3R orthogonal manipulators studied have interesting kinematic properties such as, a well-connected workspace that is fully reachable with four inverse kinematic solutions and that does not contain any void. This study is of high interest for the design of alternative manipulator geometries.
Strange stars and the cosmological constant problem
Creators: name: Bambi, Cosimo
Publisher: name: arXiv
Year: 2007
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The cosmological constant problem represents an evident tension between our present description of gravity and particle physics. Many solutions have been proposed, but experimental tests are always difficult or impossible to perform and present phenomenological investigations focus only on possible relations with the dark energy, that is with the accelerating expansion rate of the contemporary universe. Here I suggest that strange stars, if they exist, could represent an interesting laboratory to investigate this puzzle, since their equilibrium configuration is partially determined by the QCD vacuum energy density.
description: 15 pages, 3 figures. v2: reference added and typos corrected
Exercise, CaMKII, and type 2 diabetes
Creators: name: Joseph, Jitcy S.
name: Anand, Krishnan
name: Malindisa, Sibusiso T.
name: Oladipo, Adewale O.
name: Fagbohun, Oladapo F.
Publisher: name: IfADo - Leibniz Research Centre for Working Environment and Human Factors, Dortmund
Year: 2021
Subjects: exercise
type 2 diabetes
CaMKII
GLUT4
mitochondrial biogenesis
insulin resistance

description: Individuals who exercise regularly are protected from type 2 diabetes and other metabolic syndromes, in part by enhanced gene transcription and induction of many signaling pathways crucial in correcting impaired metabolic pathways associated with a sedentary lifestyle. Exercise activates Calmodulin-dependent protein kinase (CaMK)II, resulting in increased mitochondrial oxidative capacity and glucose transport. CaMKII regulates many health beneficial cellular functions in individuals who exercise compared with those who do not exercise. The role of exercise in the regulation of carbohydrate, lipid metabolism, and insulin signaling pathways are explained at the onset. Followed by the role of exercise in the regulation of glucose transporter (GLUT)4 expression and mitochondrial biogenesis are explained. Next, the main functions of Calmodulin-dependent protein kinase and the mechanism to activate it are illustrated, finally, an overview of the role of CaMKII in regulating GLUT4 expression, mitochondrial biogenesis, and histone modification are discussed.
description: EXCLI Journal; 20:Doc386; ISSN 1611-2156
Saddle-point van Hove singularity and the phase diagram of high-Tc cuprates
Creators: name: Storey, J. G.
name: Tallon, J. L.
name: Williams, G. V. M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Superconductivity (cond-mat.supr-con)
subject: FOS: Physical sciences

description: We examine the generic phase behavior of high-Tc cuprate superconductors in terms a universal van Hove singularity in the strongly overdoped region. Using a rigid ARPES-derived dispersion we solve the BCS gap equation and show that the pairing interaction or pairing energy cutoff must be a rapidly declining function of doping. This result is prejudicial to a phonon-based pairing interaction and more consistent with a magnetic or magnetically enhanced interaction.
description: 5 pages, 2 figures, submitted to Physical Review B
Geometric Invariant Theory and Generalized Eigenvalue Problem
Creators: name: Ressayre, Nicolas
Publisher: name: arXiv
Year: 2007
Subjects: subject: Algebraic Geometry (math.AG)
subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: Let $H$ be a connected reductive subgroup of a complex connected reductive group $G$. Fix maximal tori and Borel subgroups of $H$ and $G$. Consider the pairs $(V,V')$ of irreducible representations of $H$ and $G$ such that $V$ is a submodule of $V'$. We are interested in the cone $LR(G,H)$ generated by the pairs of dominant weights of such a pair of representations. Our main result gives a minimal set of inequalities describing $LR(G,H)$ as a part of the dominant chamber. In way, we obtain results about the faces of the Dolgachev-Hu's $G$-ample cone and variations of this cone.
description: comments welcome
The Eruption from a Sigmoidal Solar Active Region on 2005 May 13
Creators: name: Liu, Chang
name: Lee, Jeongwoo
name: Yurchyshyn, Vasyl
name: Deng, Na
name: Cho, Kyung-Suk
name: Karlicky, Marian
name: Wang, Haimin
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: This paper presents a multiwavelength study of the M8.0 flare and its associated fast halo CME that originated from a bipolar active region NOAA 10759 on 2005 May 13. The source active region has a conspicuous sigmoid structure at TRACE 171 A channel as well as in the SXI soft X-ray images, and we mainly concern ourselves with the detailed process of the sigmoid eruption as evidenced by the multiwavelength data ranging from Halpha, WL, EUV/UV, radio, and hard X-rays (HXRs). The most important finding is that the flare brightening starts in the core of the active region earlier than that of the rising motion of the flux rope. This timing clearly addresses one of the main issues in the magnetic eruption onset of sigmoid, namely, whether the eruption is initiated by an internal tether-cutting to allow the flux rope to rise upward or a flux rope rises due to a loss of equilibrium to later induce tether cutting below it. Our high time cadence SXI and Halpha data shows that the first scenario is relevant to this eruption. As other major findings, we have the RHESSI HXR images showing a change of the HXR source from a confined footpoint structure to an elongated ribbon-like structure after the flare maximum, which we relate to the sigmoid-to-arcade evolution. Radio dynamic spectrum shows a type II precursor that occurred at the time of expansion of the sigmoid and a drifting pulsating structure in the flare rising phase in HXR. Finally type II and III bursts are seen at the time of maximum HXR emission, simultaneous with the maximum reconnection rate derived from the flare ribbon motion in UV. We interpret these various observed properties with the runaway tether-cutting model proposed by Moore et al. in 2001.
description: 10 pages, 10 figures, The Astrophysical Journal, accepted July, 2007
Graphene bilayer with a twist: electronic structure
Creators: name: Santos, J. M. B. Lopes dos
name: Peres, N. M. R.
name: Neto, A. H. Castro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Electronic properties of bilayer and multilayer graphene have generally been interpreted in terms of AB or Bernal stacking. However, it is known that many types of stacking defects can occur in natural and synthetic graphite; rotation of the top layer is often seen in scanning tunneling microscopy (STM) studies of graphite. In this paper we consider a graphene bilayer with a relative small angle rotation between the layers and calculate the electronic structure near zero energy in a continuum approximation. Contrary to what happens in a AB stacked bilayer and in accord with observations in epitaxial graphene we find: (a) the low energy dispersion is linear, as in a single layer, but the Fermi velocity can be significantly smaller than the single layer value; (b) an external electric field, perpendicular to the layers, does not open an electronic gap
description: 4 pages, 3 eps figures
Velocity selection problem in the presence of the triple junction
Creators: name: Brener, E. A.
name: Hüter, C.
name: Pilipenko, D.
name: Temkin, D. E.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Melting of a bicrystal along the grain boundary is discussed. A triple junction plays a crucial role in the velocity selection problem in this case. In some range of the parameters an entirely analytical solution of this problem is given. This allows to present a transparent picture of the structure of the selection theory. We also discuss the selection problem in the case of the growth of a ``eutectoid dendrite'' where a triple junction is present because three phases are involved in the eutectoid reaction.
Carrier Statistics and Quantum Capacitance of Graphene Sheets and Ribbons
Creators: name: Fang, Tian
name: Konar, Aniruddha
name: Xing, Huili
name: Jena, Debdeep
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: In this work, fundamental results for carrier statistics in graphene 2-dimensional sheets and nanoscale ribbons are derived. Though the behavior of intrinsic carrier densities in 2d graphene sheets is found to differ drastically from traditional semiconductors, very narrow (sub-10 nm) ribbons are found to be similar to traditional narrow-gap semiconductors. The quantum capacitance, an important parameter in the electrostatic design of devices, is derived for both 2d graphene sheets and nanoribbons.
description: 3 pages, 3 figures, submitted to Applied Physics Letters
Transcripts: Exploring the contextual role of educational psychologists: an inductive thematic analysis.
Creators: name: Rogers, Helena
name: Jackson, James
name: Stivaros, Helen
Publisher: name: figshare
Year: 2021
Subjects: subject: 170103 Educational Psychology
subject: FOS: Psychology

description: Anonymised interviews with five educational psychologists (EPs) have been transcribed verbatim. The researchers aimed to capture how participants expressed themselves, as well as what they said, to provide context around dialogue. Transcripts were occasionally altered to protect anonymity, in cases where participants described distinguishing features such as names and places. Here, care was taken to avoid altering meanings, maintaining an ethical balance of anonymity and authenticity (Poland, 2002). The five participants were selected based on their range of backgrounds, covering four local authorities in the north of England and three training courses from across the country. Three participants were EPs and two were senior EPs, with years of practice ranging from three to 35 years. Participants undertook an individual, semi-structured interview lasting one hour. Informed by Bronfenbrenner (2006), open-ended questions prompted reflection on how nested contextual layers shape the practice of individual EPs. Interview themes (values; the role of others; success and challenge; change and stability; training and policy) supported conversations, though structure and focus were responsive to the participant. Ethical approval was granted by the Social and Health Sciences Ethics Committee, Leeds Trinity University (UK), and in line with the code of conduct of the British Psychological Society. Participants were made aware of the voluntary nature of their involvement, their right to stop or pause at any point during the interview or withdraw from the study up to ten working days following data collection. Participants (and others mentioned during the interview) have been anonymised.
Dissipative Dynamics of Matter Wave Soliton in Nonlinear Optical Lattice
Creators: name: Abdullaev, F. Kh.
name: Gammal, A.
name: da Luz, H. L. F.
name: Tomio, Lauro
Publisher: name: arXiv
Year: 2007
Subjects: subject: Other Condensed Matter (cond-mat.other)
subject: FOS: Physical sciences

description: Dynamics and stability of solitons in two-dimensional (2D) Bose-Einstein condensates (BEC), with low-dimensional (1D) conservative plus dissipative nonlinear optical lattices are investigated. In the case of focusing media (with attractive atomic systems) the collapse of the wave packet is arrested by the dissipative periodic nonlinearity. The adiabatic variation of the background scattering length leads to metastable matter-wave solitons. When the atom feeding mechanism is used, a dissipative soliton can exist in focusing 2D media with 1D periodic nonlinearity. In the defocusing media (repulsive BEC case) with harmonic trap in one dimension and one dimensional nonlinear optical lattice in other direction, the stable soliton can exist. This prediction of variational approach is confirmed by the full numerical simulation of 2D Gross-Pitaevskii equation.
description: 9 pages, 8 figures
Radio Lobes of Pictor A: an X-ray spatially resolved Study
Creators: name: Migliori, G.
name: Grandi, P.
name: Palumbo, G. G. C.
name: Brunetti, G.
name: Stanghellini, C.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A new XMM observation has made possible a detailed study of both lobes of the radio galaxy Pictor A. Their X-ray emission is of non thermal origin and due to Inverse Compton scattering of the microwave background photons by relativistic electrons in the lobes, as previously found. In both lobes, the equipartition magnetic field (Beq) is bigger than the Inverse Compton value (Bic), calculated from the radio and X-ray flux ratio. The Beq/Bic ratio never gets below 2, in spite of the large number of reasonable assumptions tested to calculate Beq, suggesting a lobe energetic dominated by particles. The X-ray data quality is good enough to allow a spatially resolved analysis. Our study shows that Bic varies through the lobes. It appears to increase behind the hot spots. On the contrary, a rather uniform distribution of the particles is observed. As a consequence, the radio flux density variation along the lobes appears to be mainly driven by magnetic field changes.
description: 15 pages, 3 figures, ApJ accepted
Enhancement of Carrier Mobility in Semiconductor Nanostructures by Dielectric Engineering
Creators: name: Jena, Debdeep
name: Konar, Aniruddha
Publisher: name: arXiv
Year: 2007
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We propose a technique for achieving large improvements in carrier mobilities in 2- and 1-dimensional semiconductor nanostructures by modifying their dielectric environments. We show that by coating the nanostructures with high-$κ$ dielectrics, scattering from Coulombic impurities can be strongly damped. Though screening is also weakened, the damping of Coulombic scattering is much larger, and the resulting improvement in mobilities of carriers can be as much as an order of magnitude for thin 2D semiconductor membranes, and more for semiconductor nanowires.
description: 5 Pages, 4 Figures
Adiabatic Pair Creation
Creators: name: Pickl, Peter
name: Duerr, Detlef
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: We give here the proof that pair creation in a time dependent potentials is possible. It happens with probability one if the potential changes adiabatically in time and becomes overcritical, that is when an eigenvalue enters the upper spectral continuum. The potential may be assumed to be zero at large negative and positive times. The rigorous treatment of this effect has been lacking since the pioneering work of Beck, Steinwedel and Suessmann in 1963 and Gershtein and Zeldovich in 1970.
description: 53 pages, 1 figure. Editorial changes on page 22 ff
XMMU J174716.1-281048: a "quasi-persistent" very faint X-ray transient?
Creators: name: Del Santo, M.
name: Sidoli, L.
name: Mereghetti, S.
name: Bazzano, A.
name: Tarana, A.
name: Ubertini, P.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: The X-ray transient XMMU J174716.1-281048 was serendipitously discovered with XMM-Newton in 2003. It lies about 0.9 degrees off the Galactic Centre and its spectrum shows a high absorption (~8 x 10E22 cm^(-2)). Previous X-ray observations of the source field performed in 2000 and 2001 did not detect the source, indicative of a quiescent emission at least two orders of magnitude fainter. The low luminosity during the outburst (~5 x 10E34 erg/s at 8 kpc) indicates that the source is a member of the ``very faint X-ray transients'' class. On 2005 March 22nd the INTEGRAL satellite caught a possible type-I X-ray burst from the new INTEGRAL source IGR J17464-2811, classified as fast X-ray transient. This source was soon found to be positionally coincident, within the uncertainties, with XMMU J174716.1-281048. Here we report data analysis of the X-ray burst observed with the IBIS and JEM-X telescopes and confirm the type-I burst nature. We also re-analysed XMM-Newton and Chandra archival observations of the source field. We discuss the implications of these new findings, particularly related to the source distance as well as the source classification.
description: 4 pages, 8 figures, accepted for publication in A&A Letters
Relativistic interaction of a high intensity photon beam with a plasma: a possible GRB emission mechanism
Creators: name: Barbiellini, G.
name: Galli, A.
name: Amati, L.
name: Celotti, A.
name: Landi, R.
name: Longo, F.
name: Omodei, N.
name: Tavani, M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: A long duration photon beam can induce macroscopic coherent effects on a plasma by single photon electron scattering if the probability of the interaction approaches 1 in a volume of unit surface and length equal to the plasma typical wavelength, and the induced electron oscillations become relativistic in few plasma cycles. A fraction of the plasma electrons is accelerated through the Wakefield mechanism by the cavities created by the photon-electron interactions and radiates through boosted betraton emission in the same cavities. The resulting emission in this framework is very similar to the typical GRB radiation. Several comparisons with GRB light curves and spectral-energy correlations will be presented.
description: 3 pages, no figure, to be published in "The Proceedings of the First International GLAST Symposium", February 5-8, 2007, Stanford University, AIP, Eds. S. Ritz, P. F. Michelson, and C. Meegan
The colour selection of distant galaxies in the UKIDSS Ultra-Deep Survey Early Data Release
Creators: name: Lane, K. P.
name: Almaini, O.
name: Foucaud, S.
name: Simpson, C.
name: Smail, Ian
name: McLure, R. J.
name: Conselice, C. J.
name: Cirasuolo, M.
name: Page, M. J.
name: Dunlop, J. S.
name: Hirst, P.
name: Watson, M. G.
name: Sekiguchi, K.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate colour selection techniques for high redshift galaxies in the UKIDSS Ultra Deep Survey Early Data Release (UDS EDR). Combined with very deep Subaru optical photometry, the depth (K_AB = 22.5) and area (0.62 deg^2) of the UDS EDR allows us to investigate optical/near-IR selection using a large sample of over 30,000 objects. By using the B-z, z-K colour-colour diagram (the BzK technique) we identify over 7500 candidate galaxies at z > 1.4, which can be further separated into passive and starforming systems (pBzK and sBzK respectively). Our unique sample allows us to identify a new feature not previously seen in BzK diagrams, consistent with the passively evolving track of early type galaxies at z < 1.4. We also compare the BzK technique with the R-K colour selection of Extremely Red Objects (EROs) and the J-K selection of Distant Red Galaxies (DRGs), and quantify the overlap between these populations. We find that the majority of DRGs, at these relatively bright magnitudes are also EROs. Since previous studies have found that DRGs at these magnitudes have redshifts of z ~ 1 we determine that these DRG/ERO galaxies have SEDs consistent with being dusty star-forming galaxies or AGN at z < 2. Finally we observe a flattening in the number counts of pBzK galaxies, similar to other studies, which may indicate that we are sampling the luminosity function of passive z > 1 galaxies over a narrow redshift range.
description: Accepted for publication in MNRAS Letters. 5 pages, 5 figures, 1 table. Higher-resolution figures available from the authors on request
MPEC 2024-T44 : 2010 SP3 = 2024 SU
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2010 SP3 = 2024 SU

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
A Subaru Weak Lensing Survey I: Cluster Candidates and Spectroscopic Verification
Creators: name: Miyazaki, Satoshi
name: Hamana, Takashi
name: Ellis, Richard S.
name: Kashikawa, Nobunari
name: Massey, Richard J.
name: Taylor, James
name: Refregier, Alexandre
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We present the results of an ongoing weak lensing survey conducted with the Subaru telescope whose initial goal is to locate and study the distribution of shear-selected structures or halos. Using a Suprime-cam imaging survey spanning 21.82 square degree, we present a catalog of 100 candidate halos located from lensing convergence maps. Our sample is reliably drawn from that subset of our survey area, (totaling 16.72 square degree) uncontaminated by bright stars and edge effects and limited at a convergence signal to noise ratio of 3.69. To validate the sample detailed spectroscopic measures have been made for 26 candidates using the Subaru multi-object spectrograph, FOCAS. All are confirmed as clusters of galaxies but two arise as the superposition of multiple clusters viewed along the line of sight. Including data available in the literature and an ongoing Keck spectroscopic campaign, a total of 41 halos now have reliable redshifts. For one of our survey fields, the XMM LSS (Pierre et al. 2004) field, we compare our lensing-selected halo catalog with its X-ray equivalent. Of 15 halos detected in the XMM-LSS field, 10 match with published X-ray selected clusters and a further 2 are newly-detected and spectroscopically confirmed in this work. Although three halos have not yet been confirmed, the high success rate within the XMM-LSS field (12/15) confirms that weak lensing provides a reliable method for constructing cluster catalogs, irrespective of the nature of the constituent galaxies or the intracluster medium.
description: To appear in ApJ, High resolution preprint available at http://anela.mtk.nao.ac.jp/suprime33/papers/p1.ps.gz
Two novel approaches for photometric redshift estimation based on SDSS and 2MASS databases
Creators: name: Wang, Dan
name: Zhang, Yan-Xia
name: Liu, Chao
name: Zhao, Yong-Heng
Publisher: name: arXiv
Year: 2007
Subjects: subject: Astrophysics (astro-ph)
subject: FOS: Physical sciences

description: We investigate two training-set methods: support vector machines (SVMs) and Kernel Regression (KR) for photometric redshift estimation with the data from the Sloan Digital Sky Survey Data Release 5 and Two Micron All Sky Survey databases. We probe the performances of SVMs and KR for different input patterns. Our experiments show that the more parameters considered, the accuracy doesn't always increase, and only when appropriate parameters chosen, the accuracy can improve. Moreover for different approaches, the best input pattern is different. With different parameters as input, the optimal bandwidth is dissimilar for KR. The rms errors of photometric redshifts based on SVM and KR methods are less than 0.03 and 0.02, respectively. Finally the strengths and weaknesses of the two approaches are summarized. Compared to other methods of estimating photometric redshifts, they show their superiorities, especially KR, in terms of accuracy.
description: accepted for publication in ChJAA
ความหนาแน่นที่เหมาะสมของการเลี้ยงปลานิลในระบบน้้าหมุนเวียนแบบอควาโปนิกส์
Creators: name: เหล็กไหล  จันทะบุตร
Publisher: name: คณะเทคโนโลยีการเกษตร  มหาวิทยาลัยราชภัฏมหาสารคาม
Year: 2017
Subjects: ปลานิล, ความหนาแน่น, อควาโปนิกส์, อัตรารอดและอัตราการแลกเนื้อ

description: วารสารเกษตรพระวรุณ, 14, 2, 225-230
MPEC 2024-T45 : 2024 TE
Creators: name: Minor Planet Center Staff
Publisher: name: The Minor Planet Center
Year: 2024
Subjects: subject: Small Solar System bodies
valueUri: http://astrothesaurus.org/uat/1469
subject: 2024 TE

description: The Minor Planet Electronic Circulars contain information on unusual minor planets, routine data on comets and natural satellites, and occasional editorial announcements.  They are published on behalf of Division F of the International Astronomical Union by the Minor Planet Center, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
"Phase Diagram" of the Spin Hall Effect
Creators: name: Hankiewicz, E. M.
name: Vignale, G.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: We obtain analytic formulas for the frequency-dependent spin-Hall conductivity of a two-dimensional electron gas (2DEG) in the presence of impurities, linear spin-orbit Rashba interaction, and external magnetic field perpendicular to the 2DEG. We show how different mechanisms (skew-scattering, side-jump, and spin precession) can be brought in or out of focus by changing controllable parameters such as frequency, magnetic field, and temperature. We find, in particular, that the d.c. spin Hall conductivity vanishes in the absence of a magnetic field, while a magnetic field restores the skew-scattering and side-jump contributions proportionally to the ratio of magnetic and Rashba fields.
description: Some typos corrected
Semi-classical buckling of stiff polymers
Creators: name: Emanuel, Marc
name: Mohrbach, Hervé
name: Sayar, Mehmet
name: Schiessel, Helmut
name: Kulić, Igor M.
Publisher: name: arXiv
Year: 2007
Subjects: subject: Soft Condensed Matter (cond-mat.soft)
subject: FOS: Physical sciences

description: A quantitative theory of the buckling of a worm like chain based on a semi-classical approximation of the partition function is presented. The contribution of thermal fluctuations to the force-extension relation that allows to go beyond the classical Euler buckling is derived in the linear and non-linear regime as well. It is shown that the thermal fluctuations in the nonlinear buckling regime increase the end-to-end distance of the semiflexible rod if it is confined to 2 dimensions as opposed to the 3 dimensional case. Our approach allows a complete physical understanding of buckling in D=2 and in D=3 below and above the Euler transition.
description: Revtex, 17 pages, 4 figures