Strain distributions in lattice-mismatched semiconductor core-shell nanowires

The authors study the elastic deformation field in lattice-mismatched core-shell nanowires with single and multiple shells. The authors consider infinite wires with a hexagonal cross section under the assumption of translational symmetry. The strain distributions are found by minimizing the elastic energy per unit cell using the finite element method. The authors find that the trace of the strain is discontinuous with a simple, almost piecewise variation between core and shell, whereas the individual components of the strain can exhibit complex variations.Comment: 4 pages, 3 figure

Holographic dark energy model with non-minimal coupling

We find that holographic dark energy model with non-minimally coupled scalar field gives rise to an accelerating universe by choosing Hubble scale as IR cutoff. We show viable range of a non-minimal coupling parameter in the framework of this model.Comment: 7 pages, no figure, corrected some typos, to be published in Europhys. Let

Composite vertices that lead to soft form factors

The momentum-space cut-off parameter $\Lambda$ of hadronic vertex functions is studied in this paper. We use a composite model where we can measure the contributions of intermediate particle propagations to $\Lambda$. We show that in many cases a composite vertex function has a much smaller cut-off than its constituent vertices, particularly when light constituents such as pions are present in the intermediate state. This suggests that composite meson-baryon-baryon vertex functions are rather soft, i.e., they have \Lambda considerably less than 1 GeV. We discuss the origin of this softening of form factors as well as the implications of our findings on the modeling of nuclear reactions.Comment: REVTex, 19 pages, 5 figs(to be provided on request

Overpartitions and Bressoud's conjecture, I

In this paper, we introduce a new partition function $\overline{B}_j$ which could be viewed as an overpartition analogue of the partition function $B_j$ introduced by Bressoud. By constructing a bijection, we showed that there is a relationship between $\overline{B}_1$ and $B_0$ and a relationship between $\overline{B}_0$ and $B_1$. Based on the relationship between $\overline{B}_1$ and $B_0$ and Bressoud's theorems on the Rogers-Ramanujan-Gordon identities and the G\"ollnitz-Gordon identities, we obtain the overpartition analogue of the Rogers-Ramanujan-Gordon identities due to Chen, Sang and Shi and a new overpartition analogue of the Andrews-G\"ollnitz-Gordon identities. On the other hand, by using the relation between $\overline{B}_0$ and $B_1$ and Bressoud's conjecture for $j=1$ proved by Kim, we obtain an overpartition analogue of Bressoud's conjecture for $j=0$, which provides overpartition analogues of many classical partition theorems including Euler's partition theorem. The generating function of the overpartition analogue of Bressoud's conjecture for $j=0$ is also obtained with the aid of Bailey pairs

Overpartitions and Bressoud's conjecture, II

The main objective of this paper is to prove Bressoud's conjecture for $j=0$. The case for $j=1$ has been recently proved by Kim. We first obtain an overpartition analogue of Bressoud's conjecture for $j=1$ by using a bijective method. We then show that Bressoud's conjecture for $j=0$ can be derived from the overpartition analogue of Bressoud's conjecture for $j=1$ with the aid of the relation between the partition function $B_0$ in Bressoud's conjecture and the partition function $\bar{B}_1$ established in our previous paper

Using Joint Utilities of the Times to Response and Toxicity to Adaptively Optimize Schedule–Dose Regimes

Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/101836/1/biom12065-sm-0001-SuppData.pdfhttp://deepblue.lib.umich.edu/bitstream/2027.42/101836/2/biom12065.pd

Contamination from magnetic starting materials in flux-grown single crystals of RFeAsO superconductors

While the flux growth often provides the best method for obtaining single crystals of new-novel materials, the process is prone to producing crystals with trapped second-phase inclusions. In the case of NdFeAsO single crystals grown out of NaAs flux under ambient pressure, some crystals show a lambda anomaly in the specific heat curve at ~12 K. This anomaly is missing in other crystals from the same batch. We show that the lambda anomaly at 12 K is from residual NdAs starting material which is mainly on the edges of the crystals. The isothermal magnetization of LaFeAsO at 300 K clearly illustrates the effect of ferromagnetic impurities on the magnetic properties of LaFeAsO crystals

Mindfulness meditation targets transdiagnostic symptoms implicated in stress-related disorders: Understanding relationships between changes in mindfulness, sleep quality, and physical symptoms

Mindfulness-Based Stress Reduction (MBSR) is an 8-week meditation program known to improve anxiety, depression, and psychological well-being. Other health-related effects, such as sleep quality, are less well established, as are the psychological processes associated with therapeutic change. This prospective, observational study (n=213) aimed to determine whether perseverative cognition, indicated by rumination and intrusive thoughts, and emotion regulation, measured by avoidance, thought suppression, emotion suppression, and cognitive reappraisal, partly accounted for the hypothesized relationship between changes in mindfulness and two health-related outcomes: sleep quality and stress-related physical symptoms. As expected, increased mindfulness following the MBSR program was directly correlated with decreased sleep disturbance (r=-0.21, p=0.004) and decreased stress-related physical symptoms (r=-0.38, p<0.001). Partial correlations revealed that pre-post changes in rumination, unwanted intrusive thoughts, thought suppression, experiential avoidance, emotion suppression, and cognitive reappraisal each uniquely accounted for up to 32% of the correlation between the change in mindfulness and change in sleep disturbance and up to 30% of the correlation between the change in mindfulness and change in stress-related physical symptoms. Results suggest that the stress-reducing effects of MBSR are due, in part, to improvements in perseverative cognition and emotion regulation, two “transdiagnostic” mental processes that cut across stress-related disorders

Experimental Quantum Cryptography with Qutrits

We produce two identical keys using, for the first time, entangled trinary quantum systems (qutrits) for quantum key distribution. The advantage of qutrits over the normally used binary quantum systems is an increased coding density and a higher security margin. The qutrits are encoded into the orbital angular momentum of photons, namely Laguerre-Gaussian modes with azimuthal index l +1, 0 and -1, respectively. The orbital angular momentum is controlled with phase holograms. In an Ekert-type protocol the violation of a three-dimensional Bell inequality verifies the security of the generated keys. A key is obtained with a qutrit error rate of approximately 10 %.Comment: New version includes additional references and a few minor changes to the manuscrip

Radiation measurements from polar and geosynchronous satellites

June 1978.Includes bibliographical references.This is the Annual report for period 1 November 1976-31 October 1977 and the Final report, 10 October 1970-31 July 1978 for National Aeronatuics and Space Administratin grant NGR-06-002-102.National Aeronatuics and Space Administratin grant NGR-06-002-10