Magnetorefractive Effect for Co/Ru Multilayer Film with Antiferromagnetic Interlayer Exchange Coupling

The spin‐dependent scattering of conduction electron in metallic magnetic multilayers was investigated to reveal the optical properties which corresponded to the magnetization state. From the measurement of magnetorefractive effect in antiferro‐magnetically exchange coupled Co/Ru multilayers, it was found that (1) the transmittance varied around 1% at wavelength of 1550 nm during the parallel/antiparallel spin alignment changes, (2) as a result of number of repetition and Co thickness for the multilayers, transmittance difference between the parallel and antiparallel spin alignment states had trade‐off relationship with the magnitude of transmittance, and (3) asymmetric Co/Ru/Co stacking structure brought different interlayer exchange coupling fields in each layer, which resulted in magnetic field sensitive transmittance.     

Mixed H2 /H∞ control under variance constraints

Dual problems, which we call output and input variance constrained H₂ /H_∞ controls, are considered. In these problems, we seek control-laws that satisfy mixed H₂ /H_∞ performance criteria, under multiple variance constraints on either outputs or inputs of time-invariant multivariable systems. The approach taken is to convert the problems into non-linear programming with both equality and inequality constraints. For both problems, the Kuhn-Tucker optimality condition is employed to obtain a first-order necessary condition for a regular point that minimizes an upper bound on the quadratic performance for the given H_∞ constraint. A second-order necessary condition and sufficiency for the strict local minimizer of the upper bound are investigated. Efficient algorithms for synthesizing the desired controllers are proposed.     

EFFECT OF HIGH PRESSURE ON THE ACCUMULATION OF IMP AND ON THE STABILITY OF AMP DEAMINASE IN RABBIT SKELETAL MUSCLE

This study evaluated the effect of high pressure on rabbit skeletal muscle, specifically on the production of inosinic acid (IMP), one of “umami” components, and on the activity of adenosine triphosphate (AMP) deaminase, which plays a role in the conversion of AMP to IMP. By increasing the pressure (0.1 to 300 MPa), nucleotide analysis showed that IMP content in muscle increased instantly with a concomitant decrease in ATP content. The IMP content of muscle at 300 MPa was approximately 15% higher than with lower pressures (0.1–200 MPa) when stored for 1 week at 4C after pressurization. These results suggested that the metabolism of nucleotides in muscle was not significantly impaired by pressure treatment. At 300 MPa, AMP deaminase maintained approximately 70% of the activity at 0.1 MPa. In contrast, the activity of purified AMP deaminase was completely lost at 200 MPa, and irreversible conformational changes were observed by in situ fluorescence spectroscopy. These results indicated that purified AMP deaminase was irreversibly denatured under pressure as high as 300–400 MPa.     

Evaluation of the Fatigue Characteristics of Laser-processed Hot Work Tool Steel Based on Reliability

It is reported that laser-processing is effective to repair the heat checks, which are fine shallow cracks on a surfaceof die-casting dies.     

Purification of Milk Catalase by Immunoaffinity Chromatography

Antiserum against commercially available bovine liver catalase was prepared in rabbits. Anti-catalase antibody in serum was prepared following 30% ammonium sulfate treatment and Sephacryl S-300 column chromatography. The anti-catalase antibody was coupled to cyanogen bromide-activated Sepharose 4B, and using this immunoadsorbent crude milk catalase was purified. About 7.0 mg pure catalase was produced from 10 kg milk. Activity of the purified products was about 2.58 × 10⁴ times as pure as cows' milk. The purified catalase was electrophoretically homogeneous, appearing as a single band.     

用热重分析法研究炭黑分解温度

利用热重(TG)分析法研究炭黑分解温度。结果表明:在相同升温速率下,炭黑粒径越大,炭黑外延起始分解温度越高;对于同一炭黑,升温速率越快,炭黑外延起始分解温度越高。在NBR/炭黑胶料中,随着NBR丙烯腈含量增大,炭黑外延起始分解温度呈降低趋势;随着炭黑用量增大,炭黑外延起始分解温度呈升高趋势,但炭黑用量超过一定值后,炭黑外延起始分解温度基本稳定。在NBR/炭黑/其他配合剂胶料中,炭黑外延起始分解温度受其他配合剂的影响较大。     

考虑脉动风影响的斜拉索在支点激励下的非线性振动

应用柔性拉索的非线性振动响应计算理论,提出考虑横向脉动风荷载作用及支点激励的拉索非线性振动计算方法。以力学特性不同的两种斜拉索为对象,通过数值方法分析横风作用和支点激励下的钢索、CFRP拉索非线性振动响应,比较支点激励频率、风速、阻尼器对参数振动响应的影响。结果表明,在拉索基频f1以及两倍基频2f1的支点位移激励下,脉动风虽然导致拉索出现不规则的竖向和横向水平振动轨迹,但不会改变拉索的参数振动特性;横向风荷载对参数振动具有空气阻尼力的效应;总体上CFRP拉索的参数振动振幅小于钢索,特别当拉索跨度比较大时,CFRP拉索的振幅将明显低于同跨度的钢索;黏性阻尼装置的减振效果与拉索的结构条件有关,当拉索的无量纲参数λ(Irvine参数)较大时,阻尼器的减振效果不明显,反之当λ较小时阻尼器有一定的减振效果。     

蒙药材止泻木子生物碱的分离与纯化

以夹竹桃科植物止泻木子的干燥种子为原材料,采用乙醇提取法对其生物碱类物质进行粗提取,通过硅胶柱层析和重结晶技术对生物碱粗提物进行分离和纯化。利用核磁共振波谱和质谱法对其一种生物碱单体进行化学结构和分子量鉴定。实验结果表明,用70%乙醇在60℃条件下静止浸取3次,每次提取6 h,得到止泻木子总生物碱提取物,其得率达到0.244%。经过硅胶柱分离和重结晶纯化,可获得3种生物碱单体。对HPLC检测纯度达到94.89%的2号生物碱单体进行核磁共振波谱和质谱检测,得知该生物碱单体是一个分子量为356.59的锥丝碱（conessine）。该结果有利于了解以止泻木子为主要成分的蒙药药剂作用机理。     

Subsolidus Phase Equilibria in the System Na2O-Bi2O3-TiO2 at 1000°C

Subsolidus phase relations in the system Na₂O-Bi₂O₃-TiO₂ at 1000°C were investigated by solid-state reaction techniques and X-ray diffraction methods. Five ternary compounds were observed in the system: Na_0.5Bi_4.5Ti₄O₁₅; Na_0.5Bi_0.5TiO₃; a cubic pyrochlore solid solution composed of xNa₂O.25Bi₂O₃.(75−;x) TiO₂ where x is 2.5 to 3.75; a new compound Na_0.5Bi_8.5Ti₇O₂₇ indexed with the orthorhombic cell of a = 5.45, b = 5.42, and c = 36.8 Å; and an unidentified phase with the probable composition NaBiTi₆O₁₄.     

纳米级超精密定位工作台的研究

研制了一套基于激光莫尔信号的超精密定位工作台,定位台以微型计算机为核心,采用激光莫尔传感器检测位置偏差,通过光、机、电的有机结合,可实现纳米级超精密自动定位.定位装置采用串联型粗、微双驱动的精密定位系统,粗动台由步进电动机通过精密丝杠机构直接驱动,可实现大行程微米级定位,微动台由压电陶瓷驱动器驱动,可实现纳米级定位.针...