Design and development of novel single multiplex system incorporating 26 rapidly mutating Y-STRs; 26 RM Yplex

This article details the development of a single multiplex system amplifying 26 rapidly mutating Y-STR markers. A sequenced allelic ladder, constructed for calling alleles of all loci, is introduced. The multiplex system shows the ability to address the limitations of Y-STRs commercial kits in differentiating closely related males. The multiplex performed well in the prevalidation tests and showed great potential to be used in forensic casework.     

利用Fe^3＋与SCN^—的显色反应检测内燃机车冷却液中的亚硝酸钠

1　引言内燃机车冷却液中NaNO2(18～22gL)的测定是采用KMnO4容量滴定法[1]。该方法重现性差、误差大[2]。作者改用稀乙酸调节冷却液酸度,以硫脲作还原剂,在波长476nm下[3]测其吸光度可求出NaNO2的含量。2　试验21　主要仪器和试剂752C型紫外可见分光光度计。标样(NaNO2标?..     

化学气相沉积金刚石薄膜探测器对α粒子的电荷收集效率

 实验测量了自行研制的三明治电极结构化学气相沉积(CVD)金刚石薄膜探测器在室温下对241Am, 243Am 与244Cm α粒子的能谱响应,得到了其α粒子响应电荷收集效率随偏压的变化关系;获得了不同偏压下其相对平均电荷收集效率及响应谱下降沿10%处的相对电荷收集效率。结果表明：所研制的CVD金刚石薄膜探测器性能稳定,对α粒子响应的电荷收集效率随偏压的增加而趋于饱和,对α粒子平均电荷收集效率达33.5%,谱下降沿10%处的电荷收集效率达57%。     

On the absence of rapidly decaying solutions for parabolic operators whose coefficients are non-Lipschitz continuous in time

We find minimal regularity conditions on the coefficients of a parabolic operator, ensuring that no nontrivial solution tends to zero faster than any exponential.

     

Homogenization of the variational inequality corresponding to a problem with rapidly varying boundary conditions

In the present paper, we investigate the asymptotic behavior of the solution of a variational inequality with one-sided constraints on ?-periodically located subsets G _ε belonging to the boundary ?Ω of the domain Ω ? ?³. We construct a limit (homogenized) problem and prove the strong (in H ₁(Ω)) convergence of the solutions of the original inequality to the solution the limit nonlinear boundary-value problem as ? → 0 in the so-called critical case.     

Averaging the trajectory attractor of a nonlinear wave equation with rapidly oscillating right-hand side

We consider a nonlinear nonautonomous hyperbolic equation with dissipation and with a small parameter multiplying the highest derivative with respect to time. This equation also involves a rapidly oscillating external force. Using a standard technique for constructing the trajectory attractor, we can prove the convergence of the attractor of a nonlinear nonautonomous hyperbolic equation with dissipation to the attractor of the corresponding parabolic equation.     

n维有向de Bruijn图和无向de Bruijn图上的随机游动

本文对有向和无向de Bruijn图上的随机游动进行了研究，得出了有向de Bruijn图上简单随机游动任意两点之间平均击中时间的显式表达式，并证明了有向和无向de Bruijn图上随机游动的快速收敛性。     

利用激光技术对材料表面缺陷进行自动测量的研究

就激光光热辐射技术测量材料缺陷的原理、实验技术进行了研究，设计了硬件与软件，实现了测量自动化，并对复合材料样品进行了测量．     

A staggered conservative scheme for every Froude number in rapidly varied shallow water flows

This paper proposes a numerical technique that in essence is based upon the classical staggered grids and implicit numerical integration schemes, but that can be applied to problems that include rapidly varied flows as well. Rapidly varied flows occur, for instance, in hydraulic jumps and bores. Inundation of dry land implies sudden flow transitions due to obstacles such as road banks. Near such transitions the grid resolution is often low compared to the gradients of the bathymetry. In combination with the local invalidity of the hydrostatic pressure assumption, conservation properties become crucial. The scheme described here, combines the efficiency of staggered grids with conservation properties so as to ensure accurate results for rapidly varied flows, as well as in expansions as in contractions. In flow expansions, a numerical approximation is applied that is consistent with the momentum principle. In flow contractions, a numerical approximation is applied that is consistent with the Bernoulli equation. Both approximations are consistent with the shallow water equations, so under sufficiently smooth conditions they converge to the same solution. The resulting method is very efficient for the simulation of large‐scale inundations. Copyright © 2003 John Wiley & Sons, Ltd.     

Picosecond optical parametric amplification of stimulated Raman as high peak-power source and ultra-sensitive preamplifier

We report the characteristics of the amplified stimulated Raman scattering (SRS) pulses generated in liquid benzene by a picosecond (ps) β-barium borate (BBO) optical parametric amplifier (OPA). When the OPA system was used as an energy amplifier for SRS pulses, with a pump energy of 2.4 mJ at 355 nm for the OPA, the maximum output energy of the amplified SRS was about 0.73 mJ for the signal and 0.18 mJ for the idler, the energy conversion efficiency was 30.4% from the pump beam to the amplified third order Stokes component at 635.1 nm. The total efficiency would be as high as 37.9% if the output of the idler is also included. The corresponding spectral line width of the amplified Raman pulse was 11.8 cm⁻¹ with a pulse width of 10.9 ps and a peak power of 67 MW. The OPA system was also used as an amplifier for very weak Raman signal, the slope gain factor of this amplifier was found to be as high as 4.1 × 10⁷ and the energy detection limit was as low as 14.8 aJ per pulse, or 48 photons at 635.1 nm, in particular. Such a detection limit corresponds to approximately 0.5 photons per pulse if the time-gate of the OPA is reduced to 150 fs and it is about the same as or even better than a recently report on the 0.75 photons detection limit for a 150-fs OPA of coherent signal at 800 nm.