阴极弧离子镀磁过滤器

在真空阴极弧离子镀的过程中,在阴极材料表面阴极斑点处的电流密度很大、斑点温度很高,发射出来的物质中包含有很多宏观粒子团（ＭＰ＇ｓ：ｍａｃｒｏｐａｒｔｉｃｌｅｓ）,构成对成膜表面的污染,人们采用了磁过滤器对ＭＰ＇ｓ进行过滤。采用的型式一般有直线结构,曲线型结构两种。本文介绍了ＭＰ＇ｓ的形成机理,各种磁过滤器的基本结构和工作原理,并着重介绍９０°弯曲弧磁过滤器的特点及离子分布规律。最后,概括介绍了阴极弧离子镀磁过滤器适用范围。     

用MCs^＋—SIMS技术研究Ti／Al2O3界面的组分分布

将ＭＣｓ＾＋－－ＳＩＭＳ技术应用扩展到了金属／绝缘体（Ｔ ｉ／Ａｌ２Ｏ３）界面分析。实验表明，选用ＭＣｓ＾＋进行分析时，克服了界面效应，取得了较好的组分分布的分析结果。随退火温度升高（室温，３００，６００，８５０℃）界面逐渐展宽，说明界面两边存在互扩散或发生了反应，且互扩散随退火温度升高而逐渐加强。随着退火温度升高，ＡｌＣｓ＾＋的信号逐步进入Ｔｉ层相应区域中，并形成两层平台，表明Ａｌ逐渐扩散到Ｔｉ     

La0.67Ca0.33Mno3—δ体材料的巨磁电阻特性

利用高温烧结法制备了多晶立方结构的Ｌａ０．６７Ｃａ０．３３ＭｎＯ３－δ体材料。材料的居里温度（Ｔｃ）为２８０Ｋ，其金属－半导体转变温度（Ｔｐ）为２７０Ｋ，接近于Ｔｃ。外加磁场下的磁电阻（ＭＲ）峰值温度与Ｔｐ十分接近。外加磁场为０．６Ｔ和５Ｔ时，材料的ＭＲ峰置分别过到４０％和７６％，材料具有显著的巨磁电阻效应，在液氮温度附近，也观察到了相当大的磁电阻效应。     

Tb0.5Dy0.5（Fe1-x）1.91（x=0～0.15）合金的温度性能研究

研究了Mn元素掺杂及热处理工艺对超磁致伸缩材料Tb0.5Dy0.5（Fe1-x）1.91（x=0～0.15）合金温度性能的影响，实验结果表明Mn掺杂对该材料居里温度影响较大，随Mn掺杂量的增加居里温度降低：在无预压应力时，Mn掺杂提高了合金的低温、低场磁致伸缩应变性能；热处理工艺对进一步提高磁致伸缩性能无明显作用。     

离子注入法增强YIG单晶薄膜的磁光效应

利用离子注入技术，将Ｃｅ￣（＋３）离子注入到ＹＩＧ单晶薄膜中，剂量为１０￣（１４）～１０￣（１６）ｉｏｎｓ／ｃｍ￣２，能量为５００ｋｅＶ。对注入前后的样品进行光吸收谱测量，发现注入后的样品光吸收有明显的增加，且样品颜色变深，对样品进行高温退火，可有效地降低光损耗。离子注入样品磁光特性测量表明Ｃｅ￣（＋３）薄膜有很大的磁光增强作用，且法拉第旋转角随注入剂量增加而增大。     

磁编码器多极磁鼓材料的研究

通过分析磁编码器磁鼓的结构和制作工艺，研究采用粘结磁性材料做磁编码器用磁鼓材料。粘结磁体采用硅烷为偶联剂，环氧树脂为粘合剂。研究了不同组份的配方对磁鼓材料的影响。制备出了Ｂｒ＝１２７７Ｇｓ，Ｈｃ＝１０７９Ｏｅ，（ＢＨ）ｍａｘ＝０．５３ＭＧＯｅ的磁鼓材料。     

磁场调制直接重写磁光存储介质的记录特性研究

用直流共溅射方法制备了富稀土－过渡族金属非晶态合金薄膜，用数值计算的方法计算了激光照射下多层膜结构盘片的温度场分布，分析了盘片材料成分和结构对热磁记录的影响，对盘片结构进行了优化设计并选定了合适的磁光层和电介质层厚度。实验盘片可在低偏场和低激光功率下记录，盘片的读写性能基本符合２．５英雨可擦重写磁光盘（ＭｉｎｉＤｉｓｋ）的使用要求。     

定向凝固稀土超磁致伸缩材料的制备及组织性能研究

采用自制的高梯度定向凝固装置制备了晶粒取向的稀土超磁致伸缩材料并考察了定向凝固和热处理工艺参数对材料组织、性能的影响规律。在本实验工艺条件下（定向温度１３７０℃），抽拉速度１２ｍｍ／ｍｉｎ，热处理温度９５０℃，保温６ｈ，炉冷）材料的磁致伸缩值可达到１８００ｐｐｍ（压自力１２．５ＭＰａ）。组织分析表明，定向凝固使得材料沿凝固方向形成了［１１０］取向组织从而使磁致伸缩值明显提高，而热处理对性能的进一步     

NdFe7—xMox薄膜的制备和磁性研究

利用对向靶溅射，同时对基片进行退火进行处理的方法，在玻璃基片上成功地制备出了ＮｄＦｅ７－ｘＭｏｘ（ｘ＝０，０．５）薄膜，并对其进行了磁性研究，ＶＳＭ测量结果表明，，Ｍｏ掺入导致了材料矫顽力ＨＣ的增大，却相应降低了饱和磁化强度Ｍｓ。随着退火温度Ｔ 提高，Ｈ随之增大，当Ｔ－５７３Ｋ时，出现一极大值为３７．８ｌＡ／ｍ，此时的热磁测量表明，样品具有最高居里温度，ＴＣ＝７７５Ｋ。     

■ SPECTROSCOPY STUDY OF THE CRYSTALLIZATION OF AMORPHOUS Fe_(77)Cr_7B_(16)

测量了Ｆｅ７７Ｃｒ７Ｂ１６非晶晶化过程周期温度Ｔｃ变化和Ｍｏｅｓｓｂａｕｅｒ秀射谱，计算了磁超精细场发布Ｐ（Ｈ）讨论了Ｆｅ７７Ｃｒ７Ｂ１６非晶晶化过程中非晶基体交换作用的变化。     

How dependent basic events with interval-valued probabilities affect fault tree analysis

This paper studies the effect of the dependence state between basic events (BEs) on fault tree analysis (FTA) when the probabilities of events are characterized by interval values. The well-known Frèchent bounds are extended for modeling six different types of dependence states between BEs. Three indices, called average dependence effect (ADE), location effect (LE) and size effect (SE), are defined for evaluating the effect of the dependence states between BEs on the probability of top event (TE) and identifying influential and non-influential dependence states. Then, the proposed method is applied to fault tree (FT) examples, thereby explaining the dependence problem in FTA. To further verify the practicability of the method, FTA of the unilateral asymmetric movement failure of an aircraft flap mechanism is performed. The results show that: (i) the opposite and negative dependence contribute to the reliability of a parallel system while the perfect and positive dependence reduce it, (ii) the perfect and positive dependence contribute to the reliability of a series system while the opposite and negative dependence reduce it, and (iii) parallel systems are more reliable than series systems regardless of the dependence between BEs.     

Prevalence and correlates of functional dependence among maintenance dialysis patients

Functional dependence is an important determinant of longevity and quality of life. The purpose of the current study was to determine the prevalence and correlates of functional dependence among patients with end‐stage renal disease (ESRD) receiving maintenance dialysis. We enrolled 148 participants with ESRD from five clinics. Functional status, as measured by basic and instrumental activities of daily living (ADL, IADL), was ascertained by validated questionnaires. Functional dependence was defined as needing assistance in at least one of seven IADLs or at least one of four ADLs. Demographic characteristics, chronic health conditions, anthropometric measurements, and laboratories were assessed by a combination of self‐report and chart review. Cognitive function was assessed with a neurocognitive battery, and depressive symptoms were assessed by questionnaire. Mean age of the sample was 56.2 ± 14.6 years. Eighty‐seven participants (58.8%) demonstrated dependence in ADLs or IADLs, 70 (47.2%) exhibited IADL dependence alone, and 17 (11.5%) exhibited combined IADL and ADL dependence. In a multivariable‐adjusted model, stroke, cognitive impairment, and higher systolic blood pressure were independent correlates of functional dependence. We found no significant association between demographic characteristics, chronic health conditions, depressive symptoms or laboratory measurements, and functional dependence. Impairment in executive function was more strongly associated with functional dependence than memory impairment. Functional dependence is common among ESRD patients and independently associated with stroke, systolic blood pressure, and executive function impairment.     

Noise assessment of a Fourier transform infrared spectroradiometer subject to the stability of a conventional laboratory blackbody source

A method is described for the measurement of the noise-equivalent spectral radiance (NESR) of Fourier transform infrared (FTIR) spectroradiometers at all wave numbers of a selected range. The method requires minimal detailed knowledge of the sensor and no support equipment beyond a blackbody source. The NESRs of the FTIR spectroradiometer are determined at every wave-number increment in the 700-1300 cm(-1) range, for six resolutions, with a conventional blackbody source and ensembles of differential spectra. The NESRs are well behaved and consistent with the expected dependence on resolution; however, they depend on source temperature at the highest (1 cm(-1)) and lowest (32 cm(-1)) resolutions, with little or no statistical dependence at intermediate resolutions. Residual source drift is shown to be the likely cause of the dependence at 1 cm(-1); the dependence on the source at 32 cm(-1) resolution is shown to be most probably due to photon noise. At intermediate resolutions the sensor noise is dominant.     

Ultrasonic study of sintered SiC at low temperatures

We investigated the temperature dependence, at low temperaturs, of sound velocity in sintered silicon carbide samples, containing three different sintering additives, boron or beryllium oxide or aluminum nitride. It was found that samples containing AlN or B showed lnT dependence (T is the temperature) of sound velocity but the one with BeO did not. The slope of the lnT dependence, which is proportional to the density of states of two level tunneling systems (TLS), is much larger for SiC with AlN than that with B. This sequence and no lnT dependence in BeO, correlate with the solubility of these additives into SiC, suggesting that the TLS, at least in this case, are created by the additives in solid solutions in the crystals. The samples containing B were heat treated to allow grain growth as well as densification. The density of states of TLS in these samples (measured by the slope of the lnT dependence of velocity) increased as the grain size increased. This suggests that the TLS do not reside in grain boundaries and that B migrates from the grain boundaries (where it originally segregated) into the bulk, thus creating more TLS inside the grains.     

Polarization dependence of readout signals from periodic one-dimensional arrays of magnetic domains in magneto-optical media and crystalline-amorphous line pairs in phase-change media of optical recording

Polarization dependence of signals from periodic one-dimensional arrays of magnetic domains in magneto-optical (MO) media and crystalline domains in amorphous phase-change (PC) media has been studied by theoretical calculation and experiment. The MO signal in the small-period regime depends on the direction of incident polarization. The relative strength of the E(?) and E(?) signals changes depending on the period of the pattern, the wavelength of the light, and the numerical aperture of the objective lens. For PC media, the reflected signal has similar polarization dependence, but this dependence is weak.     

Dislocation Vibration, Morse Potential Function and Temperature Dependence of Critical Resolved Shear Stress of Some Single Crystals

1.IntroductionDislocationsincrystalsrelatet0mechanicalpr0p-ertiesclosely.Usingthedislocationthe0ry,0necanunderstandtheatomicpr0cessesinvolvedinslipincrystals.Slipbegins0nagivensysternwhentheshearstressbeingresolvedonthissystemreachesacriticalvalue.Thiscriticalvalueiscal1edthecriticalresolvedshearstress(CRSS).Themagnitude0fCRSSfortheslipisveryvari-able,beingaffectedbythepurity0fcrystal,strainrateandtemperatureetc.Ofalltheaffectingconditi0ns,thetemperaturedependenceofCRSS0fcrystalhasalways…     

Polarization dependence of two-photon absorption in an AlGaAs waveguide autocorrelator

We have obtained the complete polarization dependence of the two-photon absorption coefficient beta by measuring the orientational dependence and the contrast ratio of the photocurrent in an Al(0.2) Ga(0.8) As waveguide autocorrelator at an optical frequency far above the half-bandgap. The measured polarization dependence is consistent with theory and previous picosecond nonlinear transmission experiments. The cubic symmetry of the nonlinearity provides a contrast ratio that exceeds 2, which is larger than would be obtained assuming an isotropic medium and Kleinmann symmetry. This device was used to obtain an autocorrelation of a mode-locked Nd:YLF laser.     

Dependence of the magnetic Barkhausen emission with carbon content in commercial steels

In this work, the dependence of the magnetic Barkhausen Effect (MBE) with carbon content in commercial steels has been studied. The dependence of the MBE amplitude, root mean square voltage and the parameters that characterize the form of the MBE Jumps with different carbon content were obtained. The cause of this dependence was analyzed on the base of domain walls theory.