高加速应力试验及极限应力试验综述

介绍了高加速应力试验(HAST)及极限应力试验(limit test)的基本概念和相关背景,列举了当前国内外一些常用的技术方法、工程应用状况、试验模型及分析方法、试验剖面的建立及失效机理的确定等。指出了高加速应力试验及极限应力试验要注意的问题,并对它们的发展动向作了简单的预测。     

金铝键合寿命评价方法研究

由于金属间化合物的生成,会使金铝键合的接触电性能受到影响.从金属间化合物生成这一单一失效机理出发,以失效物理为理论基础,通过恒定高温加速和高温步进加速试验,针对不同温度下的金铝键合寿命做出评价,并给出键合寿命评价流程.     

栅氧化层TDDB可靠性评价试验及模型参数提取

采用恒定电压和恒定电流试验方法对20nm栅氧化层进行了TDDB可靠性评价试验，并完成了1／E模型参数提取，给出了恒定电流应力下描述氧化层TDDB退化的统计模型，较好地解释了试验结果。     

电子元器件的贮存可靠性及评价技术

综述了国内外元器件的贮存可靠性研究现状,分析了元器件贮存失效模式及原因,表明减少元器件自身缺陷、改善固有可靠性是提高其贮存可靠性的关键。并从应用性角度出发,对现场贮存、长期自然贮存试验、极限应力、加速贮存寿命试验等贮存可靠性评价技术进行了对比分析。     

一种高精度超声测距方法的研究

本文介绍了一种基于超声波循环反射测量原理的高精度超声测距方法 ,并给出了以单片机为核心的测距系统的组成 .本测量法克服了多次反射法中对回波脉冲个数的限制 ,经温度补偿后测量精度得到了明显改善 .     

Head trauma: CT scan interpretation by radiology residents versus staff radiologists

The determination of diagnostic features in recorded heart sounds was investigated with Carpentier-Edwards (CE) bioprosthetic valves. Morphological features, extracted using the Choi-Williams distribution, achieved between 96 and 61% correct classification. The time-scale wavelet-transform feature set achieved 100% correct classification with native valve populations, and 87% with the CE replacements.     

Status of cerebral circulation in patients with hemiplegia of vascular and traumatic origin treated with decimeter therapy and an alternating magnetic field

Results of treating 181 patients for hemiparesis after a cerebral stroke or a craniocerebral injury by local exposure of the pathological focus to decimeter electromagnetic waves (DW) and alternating magnetic field (AMF) are presented. It is shown that these treatment methods improve the cerebral circulation and contribute to earlier restoration of the motor functions, especially, if used in combination with sulfide baths, therapeutic physical exercises and massage. The therapeutic effectiveness of the DW- and AMF-therapy is confirmed objectively by so informative examination methods, as rheoencephalography, ultrasonic dopplerography, and thermography.     

Metastasis of malignant melanoma of the nasal mucosa to the small intestine

Malignant melanoma of the mucous membranes is rare and has a very poor prognosis. When localized in the nose, the tumor becomes apparent late in the course of the disease with nasal obstruction and epistaxis. Distant metastases are uncommon, but any organ of the body can be involved. A case of a malignant melanoma of the nasal mucosa with metastasis to the small intestine is presented, and the natural history of the metastatic disease is discussed.     

Urinary excretion of vanilmandelic acid in the glossalgia syndrome

Under observation there were 78 patients aged 41 to 70 years suffering from the glossalgia syndrome, as well as 25 clinically healthy subjects. An activation of the sympathoadrenal system was revealed in the patients. This was ascertained on the basis of the data on vanillylmandelic acid excretion with the urine. The excretion of that acid is known to be dependent on the intensity of the paraesthesias, the duration of the ailment and the character of concurrent visceral diseases. The results obtained are regarded as evidences of the participation of the vegetative nervous system in the mechanism of the glossalgia syndrome development.