检测黑洞双星的自转

基于旋转黑洞能量提取的两种机制,Blandford-Znajek(BZ)和magnetic coupling(MC)的共存模型,提出计算黑洞自转的一种新方法.利用该方法计算了既有射电喷流又有高频准周期振荡的黑洞双星的自转,发现其中心是一个与吸积盘旋转方向相同的快转黑洞,且黑洞自转范围很窄.该方法得到的计算结果与其他方法得到的结果很接近.     

基于MC33035的无刷直流电机控制器

本文介绍了美国Motorola公司的第2代无刷直流电机控制器专用芯片MC33035的基本原理,设计了一种以专用控制芯片MC33035、MC33039为核心构成的无刷直流电机控制器。     

Solvent effect on the syn/anti conformational stability: A comparison between conformational bias Monte Carlo and molecular dynamics methods

The solvent effect on the syn/anti population ratio of the mesityl oxide (MOx) was investigated using a new implementation of conformational bias Monte Carlo (CBMC) and molecular dynamics (MD) methods. It was observed by a previous theoretical work (Theor. Chem. Acc. (2012) 131:1214) that in gas-phase the MOx exists dominantly in syn-form and in aqueous solution in anti-form. The syn/anti free energy difference in the gas phase was used in the intramolecular parametrization and a rotational barrier of approximately 10 kcal mol⁻¹ was found. Molecular systems with barriers of this order of magnitude have been studied by experimental techniques. However, they have not been discussed yet comparing CBMC and MD simulations. In this work, we show that the intramolecular geometrical information such as bond lengths, angles and torsional angles sampled with CBMC and MD methods are equivalent. Nonetheless, only the CBMC simulations sample appropriately the syn/anti population ratio. With the CBMC configurations in gas phase, it was obtained 95% in syn-form and 5% in anti-form regardless the initial conformation. An inversion of the population was found in water, 25% in syn-form and 75% in anti-form. Comparing the gas phase and in-water CBMC sampling, it was observed that the MOx spends typically approximately 110 successive MC cycles in anti-form and approximately 2300 in syn-form in gas phase. While it was much larger with explicit water, approximately 400 times more for anti-form and approximately 6 times more for syn-form. We argue that this strong stabilization of the anti-form in aqueous solution, does not come from the MOx-water hydrogen bonds interactions, because they are the same for both conformations. Instead, the stabilization comes from the dipole-dipole interaction caused by a larger dipole moment of the MOx in the anti-form, 7.2 D, than in the syn-form, 5.2 D. With the MD sampled configurations in both conditions, we observe that the syn/anti conformational change is a very rare event due to the rotational barrier, which is approximately 17 times larger than the thermal energy. Therefore, the MD sampling of the MOx is not appropriated because it is strongly dependent on the initial conformation even for large simulations with 150 ns up to 400 ns for the isolated solute and for solute–solvent systems.     

序列图像的高精度面绘制方法

分析总结前人在面绘制方面工作的基础上,提出了一种极大地提高曲面绘制精度的数学方法——有理函数插值方法,可以有效的克服MC算法（Marching cubes）？MT算法（Marching tetrahedron）等由于采用线性插值而引起的在连接三角形面片时所造成的连接二义性问题以及拓扑不一致性问题。从实际数据的三维重建中可以看出使用该方法所绘制的等值面美观？光滑,具有很高的应用价值。     

基于ARM的移动手持终端的研究

针对当前缺乏适合的移动物流配送手持终端的状况,提出了一种基于ARM的嵌入式物流配送移动手持终端的设计方案.系统以三星公司的S3C2410为核心,使用WINDOWS CE操作系统,通过基于GPRS技术的无线通信方式实现主机与手持无线终端之间的数据交换,具有较高的实时性、可靠性.     

嵌入式Web Server中TCP/IP协议的实现

介绍了单片机MC68HC908AP64与以太网控制芯片RTL8019AS的硬件接口电路实现,以及在AP64中如何运用嵌入式Internet的基本理论实现一个瘦TCP/IP协议栈,并且应用瘦TCP/IP协议栈实现嵌入式Web Server。通过该系统可以将家电的控制信号转化成因特网上的信息进行传输,从而实现对设备的远程控制。     

用MC1496设计AM调制器

介绍了集成模拟乘法器MC1496的内部结构及原理,给出了用MC1496设计AM模拟调制器的方案及设计电路,分析了在幅度调制中对已调波形的影响因素.     

Effects of Quenching Temperature and Time on Pore Diameter of Poly（3-hydroxybutyrate-co-3-hydroxyhexanoate） Porous Scaffolds and MC3T3-E1 Osteoblast Response to the Scaffolds

Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) (PHBHHx) scaffolds were prepared by thermally inducing phase separation (TIPS) for bone reconstruction. Scanning electron microscopy and porosity measurements were used to analyze the structure and properties of the scaffolds. The pore diameter of the scaffolds could be easily controlled by changing the quenching temperature and time. The biocompatibility was assessed by examining the proliferation and morphology of MC 3T3-E1 osteoprogenitor cells seeded on the scaffolds. Cultures grown in the presence of a source of phosphate ions showed the formation of a mineralized extracellular matrix. The results indicate that PHBHHx scaffolds prepared using TIPS are a promising candidate for bone reconstruction.     

MC-DS/CDMA系统中最小均方误差检测器

如何抑制多址干扰 ,同时降低实现复杂度 ,是研究MC- DS/ CDMA系统的关键之一。论文在已有的联合最小均方误差 (MMSE)检测器的基础上 ,提出了两种基于单载波的MMSE检测器结构 ,即 MMSE- MRC结构和 MMSE- MMSE结构 ,比较了几种接收机的性能。仿真表明 :MMSE- MRC和 MMSE- EGC的性能与传统的解扩— MRC结构相近 ,不能有效地抑制多址干扰。当载波数较小或较大时 ,MMSE-MMSE的性能接近联合 MMSE检测器 ,而计算量只有O(N3/ M2 +M3) ,远小于联合 MMSE检测器的计算量 ,有利于工程实现。