Nuclear chart in covariant density functional theory with dynamic correlations: From oxygen to tin

Nuclear masses of even-even nuclei with the proton number 8≤Z≤50(O to Sn isotopes)from the proton drip line to neutron drip line are investigated using the triaxial relativistic Hartree-Bogoliubov theory with the relativistic density functional PC-PK1.Further,the dynamical correlation energies(DCEs)associated with the rotational motion and quadrupole-shaped vibrational motion are taken into account by the five-dimensional collective Hamiltonian(5DCH)method.The root-mean-square deviation with respect to the experimental masses reduces from 2.50 to 1.59 MeV after the consideration of DCEs.The inclusion of DCEs has little influence on the position of drip lines,and the predicted numbers of bound even-even nuclei between proton and neutron drip lines from O to Sn isotopes are 569 and 564 with and without DCEs,respectively.     

多状态寿命表逗留时间期望长度的渐近理论的一个注记(英语)

本文运用计数过程技术,给出了多状态寿命表的平均逗留时间的一个估计及其方差估计,讨论了这些估计量的均匀相合性与弱收敛性。     

The Neighbourhood of Dihedral 2-Groups

We examine two particular constructions that derive from a 2-group G=G() another 2-group G(*) for the case when G() is one of , , . The constructions (cyclic and dihedral) have the property that x*y=xy for exactly 3/4 of all pairs (x,y)G×G. Work supported by by Grant Agency of Charles University, grant number 269/2001/B-MAT/MFF. The second and the third authors were also supported by the institutional grants MSM 113200007 and MSM 210000010, respectively.Mathematics Subject Classifications (2000) primary: 20D60, secondary: 05B15.     

杨氏模量的两种测试方法

本文介绍了对杨氏模量测定仪的改进方法，并与使用原装置测得的数据进行了对比，拓宽了实验的内容。     

Bayesian graduation of FHA/HUD single-family home mortgage insurance contracts — Section 203

In this paper we will describe a procedure used to construct the survivorship (or double-decrement) table for FHA Section 203 mortgage insurance contracts on single-family home mortgages having a 30-year term. The methodological approach is based on a procedure known in the actuarial literature as Bayesian graduation. This procedure has been described by Kimeldorf and Jones (1967) and Hickman and Miller (1977).     

多元智力理论在大学物理实验学习评价中的应用

霍华德·加德纳的多元智力理论是影响美国和西方国家教育改革指导思想的一种重要理论．根据多元智力理论分析了学生在大学物理实验学习评价中的智力构成的表现,并据此表现设计实施评价的可行性量表,这将有助于提高实验教学效果．     

Quantum stochastic differential equation for squeezed light

In this paper, the quantum stochastic differential equation (QSDE) is derived which is based on explanatory for interaction of open quantum system with squeezed quantum noise. This equation describes the stochastic evolution of unitary operator and is used to compute the evolution of quantum observable and output field. Our QSDE has complete form with respect to previous QSDE for squeezed light, because it bears three fundamental quantum noises for its evolution and the scattering between quantum channels is included. Meanwhile, when squeezed noise reduces to vacuum noise, our QSDE reveals the famous Hudson-Parthasarathy QSDE. Our equations may have application for quantum network analysis of squeezed noise interferometer for gravitational wave detection.     

Truth‐table Schnorr randomness and truth‐table reducible randomness

Schnorr randomness and computable randomness are natural concepts of random sequences. However van Lambalgen’s Theorem fails for both randomnesses. In this paper we define truth‐table Schnorr randomness (defined in 6 too only by martingales) and truth‐table reducible randomness, for which we prove that van Lambalgen's Theorem holds. We also show that the classes of truth‐table Schnorr random reals relative to a high set contain reals Turing equivalent to the high set. It follows that each high Schnorr random real is half of a real for which van Lambalgen's Theorem fails. Moreover we establish the coincidence between triviality and lowness notions for truth‐table Schnorr randomness. © 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim     

The 13-modular character table of 2.Suz.2

We compute the 13-modular character table of the bicyclic extension 2.Suz.2 given in the Atlas. This completes the last unknown modular character table of a bicyclic extension of the sporadic simple group Suz. We explain an issue of compatibility between different modular tables and partially recompute the 7-modular table of 2.Suz.2 in order to avoid such problems.     

Consideration of data load time on modern processors for the Verlet table and linked-cell algorithms

Neighbor search algorithms are widely used in molecular dynamics for the direct computation of short‐range pairwise interatomic potentials. These algorithms are based on the Verlet table (VT) and linked‐cell (LC) methods. It is widely believed that the VT is more efficient than the LC. The analysis of these methods shows that in case when the average number of interactions per particle is relatively large, or more specifically, the particle density ρ and skin radius r_skin meet the condition (4π/6) ρr/27 ? 1, which may be true for most simulations of liquids, the number of memory data load operations in the LC is much less than that in the VT. Because memory access on modern processors is a bottleneck, this advantage of the LC should be and was in fact used, and a code outperforming the VT by a factor of almost 2 was obtained. Some modifications of the VT were proposed to reduce its disadvantage concerning memory data loading. The key modifications included automated skin radius tuning during simulations and compression of the VT to minimize duplications of atom identifiers in its nearby rows. Although these modifications had improved the performance, the VT failed to regain the superiority over the LC. The methods were tested in the MOLKERN simulation software by using SIMD and multithreading. © 2011 Wiley Periodicals, Inc. J Comput Chem, 2011