A construction of a perfect set of Euler tours of K2k + I

In this article we define a perfect set of Euler tours of K_2k + I, I a 1-factor of K_2k, to be a set of Euler tours of K_2k + I that partition the 2-paths of K_2k, with the added condition that if ab ∈ I, then each Euler tour contains either the digon a b a or b a b. We prove for all k > 1 that K_2k + I has a perfect set of Euler tours, and, as a corollary, that L(K_2k) has a Hamilton decomposition. © 1998 John Wiley & Sons, Inc. J Combin Designs 6: 183–211, 1998     

New agitated and thermostatized cell for in situ monitoring of fast reactions by synchrotron SAXS

A thermostatized and agitated sample cell for synchrotron small‐angle X‐ray scattering (SAXS) measurements of liquid samples (homogeneous or heterogeneous) has been developed. The cell is composed of a compact main body with inlet and outlet windows for the beams of light. The volume of the cell is approximately 0.8 ml and the distance between the windows is 5 mm to allow accurate SAXS measurements. The cell is thermostatized by means of a jacket that surrounds the sample holder and it is connected to a thermostatic bath. In addition, the cell has a top and a bottom lid that allow easy cleaning and maintenance without demounting the optical windows. The cell has been used to run SAXS measurements of liquid samples and, for the first time, a mini‐emulsion polymerization reaction has been monitored by SAXS.     

偏心圆等值线族

根据定义给出偏心圆线族方程和共轴圆族方程，利用文献[2]方法验证了偏心圆线族等势性，给出偏心圆线族与共轴圆线族的等势线和场线关系．     

International linear collider simulations using BDSIM

Power loss simulations for the 2, 14, and 20 mrad extraction line designs using the BDSIM toolkit are presented. A preliminary study on the backgrounds from the beam losses along the extraction line in the case of 20 mrad with high luminosity parameters is also given.      

Optimization of the filter technique

A technique of the resonant filtering is used in the Mössbauer spectroscopy for receiving polarized radiation. Two main contributions suppress the filter quality: unwanted small absorption line located at the resonance energy and large unwanted absorption line located far from the resonance energy. Both contributions can be parametrized by a single small parameter r. The optimal effective thickness is proportional to 1?/?r ², while the departure of the maximum polarization degree from the unity is proportional to r.     

考虑交易成本的一种新型资本市场线模型研究

本文利用均值 -方差模型 ,通过引进优良资产 ,在考虑了交易成本的前提下 ,利用优良资产特性推导出一种新的资本市场线     

Exact analytical formula for Voigt spectral line profile

An analytical formula for the Voigt spectral line profile has been derived. The obtained formula is the solution of the second-order differential equation of the Voigt profile. The obtained results using the new analytical formula are in perfect agreement with the published results obtained by numerical calculation methods for a wide range of the line damping parameter (a) . The accuracy of the obtained formula is found to be 100% for all ranges of the line damping parameter (a).     

线结构光共焦显微成像技术的实验研究

激光共焦扫描显微镜大多采用点共焦扫描成像形式,扫描机构复杂,成本高。新型的线结构光共焦显微成像技术是对样品进行线共焦成像,只需对样品进行一维扫描就可以得到整个平面的像。设计了线结构光共焦成像实验装置,进行了线结构光共焦显微成像实验。实验结果证明了线结构光共焦成像的可行性,杂散光明显地减少,提高了成像清晰度,并且有光学层析能力。采用低照度高分辨率CCD代替价格昂贵的像增强器大大降低了系统成本。     

A comparison of heuristic algorithms for cost-oriented assembly line balancing

Two new heuristic algorithms for solving cost-oriented assembly line balancing problems -the Wage-Rate-Method (WR) and the Wage-Rate-Smoothing-Method (WRS) — are presented and compared with two known heuristics — the Positional-Weight-Method (PW) and the Positional-Weight-Wage-Rate-Difference-Method (PWWD) with respect to their solution qualities. Firstly, the heuristics are outlined and their computational effort is stated. Then, a theoretical worst-case bound for the solution quality is given and the results of an extensive performance study are reported. In the study the heuristics were investigated with respect to their solution quality by solving randomly generated line balancing problems and problems from literature. It can be concluded that PWWD and WRS are generally superior to PW and WR.Parts of this research have been supported by the Stiftung Industrieforschung.     

On ηc line shape in charmonium transitions

The line shapes to observe ηc in charmonium transitions, I.e.,ψ(2S), J/ψ→γηc, are investigated. The ηc line shapes in exclusive decays or by observing the inclusive photon spectrum are given. The sensitivities to measure the ηc resonance parameters are also evaluated. With more than two thousand ηc events observed, the precision of the ηc decay width measurement will be improved by better than 3%. However, the uncertainties associated with the ηc modified line shapes will dominate the systematic errors and this will prohibit precision mass and width measurements.