Four-Quasiparticle High-K States in Neutron-Deficient Lead and Polonium Nuclei

Configuration-constrained potential energy surface calculations have been performed to investigate four-quasiparticle high-K configurations in neutron-deficient lead and polonium isotopes. A good agreement between the calculations and the experimental data has been found for the excitation energy of the observed Kπ = 19- state in 188Pb. Several lowly excited high-K states are predicted, and the large oblate deformation and low energy indicate high-K isomerism in these nuclei.     

用DPT-35-Ⅰ开发一位机

复旦大学计算机系设计、江苏启东电子仪器厂生产的DPT-35-Ⅰ简易开发装置,对一位机可以进行在线开发,软硬件同时调试,一次成型,简易、方便、迅速。 DPT-35-Ⅰ简易开发装置或称“EPROM仿真器”,除连续运行外,其余对8035的开发功能对5G14500均适用。需要5G14500连续运行时,可将开发装置放在设断点运行状态,断点地址送非一位机运行地址。例一位机指令存放在000～2FF单元,此时断点     

一种高性能电流调节器的设计

基于0.5μm CMOS工艺,设计了一种能够在较大范围内工作的电流调节器。该电路通过适当地利用NMOS和PMOS差分输入对的各自特性,以及改进的差分结构,实现了工作范围的扩展和共阴极LED的驱动。该电流调节器采用的运算放大器都是一级的自补偿结构,从而简化了电路的稳定性设计,提高了物理实现的成功率。仿真结果表明,该电流调节器在整个工作范围内的精度可以达到80%以上。     

一种适用于降压型DC-DC转换器的过零检测电路

本文提出了一种新颖的过零检测电路。该电路的特点在于,结构简单,易于实现,且由于所用管子较少,极大地节省了版图面积,功耗也随之降低。基于0.35μm BCD工艺,利用Hspice对该电路进行了验证。仿真结果表明,该电路在给定的工艺和温度波动范围内(-40℃-125℃)都能够实现高精度的过零检测,具有较强的鲁棒性;且电路消耗的电流仅为24μA。     

一种高性能快速响应比较器电路

基于0.5μmCMOS工艺设计了一种具有快速瞬态响应的高性能比较器电路。利用大带宽前级放大器与后级高增益放大器的有机结合,实现高精度比较的同时保证比较器具有快速的瞬态响应。此外,提出了一种有源箝位电路,通过对比较器中间结点电压的变化范围加以限制,从而进一步提升了比较器的瞬态响应速度。仿真验证结果表明,该比较器电路仅需10μA电流即可实现33ns以内的瞬态响应时间,增益高达110dB,分辨率在1.5μV左右。     

New Soft x-ray PHA Diagnostic in the HT-7 Tokamak

A soft x-ray Pulse Height Analysis (PHA) diagnostic with the recently introduced Silicon Drift Detector (SDD) and a new MCA system has been installed in HT-7 for the measure-ments of electron temperature. With the SDD detector, the x-ray emission can be detected in the energy range from 1 keV up to 20 keV. The extremely low anode capacity of SDD allows very high counting rates of x-ray above 200 kHz and short shaping times below 0.25μs to be measurede. In routine operation a counting rate of 120 kHz has been normally obtained with an energy resolution of better than 180 eV at 5.9 keV. The assembly is equipped with six SDD detectors measuring the soft x-ray emission integrated along six chords of the upper half plasma cross section. The preliminary results from the new soft x-ray PHA diagnostic are also presented in this paper.     

一种高性能欠压封锁电路

基于0.6μm BiCMOS工艺设计了一种无需基准电压源和比较器的高性能欠压封锁电路(UVLO)。利用带隙基准电压源的原理,实现了欠压封锁的阈值点和迟滞量;而且带隙基准电压源结构自身的稳定性决定了欠压封锁能够稳定工作。仿真验证结果表明,该欠压封锁电路的翻转阈值点几乎不随温度变化。     

白鲢鱼骨蛋白酶水解工艺研究

以白鲢鱼骨蛋白为对象,研究Alcalase、Flavorzyme两种蛋白酶的适宜水解条件,并采用正交试验对Alcalase与Flavorzyme分步水解白鲢鱼骨蛋白的工艺进行了优化。结果表明:Alcalase、Flavorzyme的适宜反应温度分别为55和50℃,适宜反应pH值分别为7.5和6.0。分步酶水解的适宜条件是在料液比1:4(W/V),起始pH8.0时,用1500U/g、PrAlcalase于55℃水解2h后,再用1500U/g、PrFlavorzyme水解2h,水解度达30.05%,氮收率达79.80%;比单独用Alcalase或Flavorzyme水解时,鱼骨蛋白的水解度分别提高了10.05%和10.07%,氮收率分别提高了4.54%和12.54%。     

一种低功耗高稳态电平位移电路

提出了一种新型低功耗、高稳态电平位移电路。该电路能将5 V输入电压转换为10 V输出电压,在电路的初态和电平转换过程中均保持高稳态。采用瞬态增强结构,能加速电平信号之间的转换,有效地减小了传输延迟,提高了电路稳定性。瞬态增强结构在稳定状态时不发挥作用,减小了静态功耗,获得了低功耗。基于标准0.35 μm BCD工艺和多5 V LDMOS耐压器件,对该电平位移电路在5 MHz频率下进行验证。结果表明,动态功耗仅为24.8 μA,上升沿响应速度仅为12.7 ns,下降沿响应速度仅为22.8 ns。该电路具有可靠性高、功耗低的优点。     

Shape Co-Existence in the Transitional Nuclide 157yb

High-spin states in 157yb have been populated in the 144Sm(16O, 3n)157yb fusion-evaporation reaction at a beam energy of 85 MeV, and two rotational bands have been established for the first time. Within the framework of the triaxial particle-rotor model, the energy spectra and single-particle configurations of 157yb are investigated. The calculated energy spectra agree well with the experimental data. The newly observed vf7/2 band, and the previously known vi13/2 band in 157yb, are also discussed by means of Total-Routhian-Surface methods. The structural characters observed in 157Yb provide evidence for the shape coexistence of three distinct shapes: prolate, triaxial and oblate. At higher spins, both the vf7/2 band and the vi13/2 band in 157yb undergo a shape evolution with sizable alignments occurring.