Pb(Zn1/3Nb2/3)O3基复相陶瓷的室温介电老化行为

研究了Ｐｂ（Ｚｎ１／３Ｎｂ２／３）Ｏ３基复相陶瓷的室温介电老化行为与材料烧成制度的关系,性机和介电常数与老化时间的对数值成线性关系,随烧成温度提高和保温时间延长,老化速率增大,老化速率对频率的依存性增加。低温短时间烧结的复相陶瓷的介电老化行为类似于正常铁电体,其老化起因于畴壁运动;而高温长时间烧结的复相陶瓷表现为典型弛豫电体的老化行为,起因于缺陷偶极子与极性微区的相互作用。     

热分析在橡胶工业中的应用

评述了热分析在测定硫化胶的基本组成,配方设计中增塑剂和防老剂的选择,监控股料老化和硫化等方面的应用。热分析具有灵敏度高、快速、可靠和使用方便等特点。     

变形铝及铝合金状态代号体系研究

论述了我国变形铝及铝合金状态代号体系的状态,采用美国状态的依据,可行性及国外状态的发展趋势。并结合生产实际,对热处理状态和加工硬化状态进行了研究,为今后生产同类状态的产品提供生产实践依据。     

Tensile properties and fatigue crack propagation of solution-annealed and aged superaustenitic stainless steel

The effect of aging in air at 650°C for 100~1000 h on the tensile properties of superaustenitic stainless steel in the range RT-750°C and the fatigue crack growth behaviour at RT and 650°C was studied. Yield strength and ultimate tensile strength were almost the same between the as-received and the aged specimen. The fracture strain, however, decreased significantly from aging, and the fracture surface of the aged specimen at RT test was intergranular. The fatigue crack growth rate at RT is enhanced by aging at the high stress intensity factor range. This is due to the occurrence of an intergranular fracture in the aged specimen. At 650°C the fatigue crack growth behaviour of both the as-received and the aged specimen was almost same with no intergranular fracture.     

"Age-linked declines in retrieving orthographic knowledge: Empirical, practical, and theoretical implications": Correction to MacKay and Abrams (1998).

Reports an error in "Age-linked declines in retrieving orthographic knowledge: Empirical, practical, and theoretical implications" by Donald G. MacKay and Lise Abrams (Psychology and Aging, 1998[Dec], Vol 13[4], 647-662). The article contained an error. In Table 1 on page 652, the values for rated spelling ability at age 20 and at current age were reversed for older and oldest adults. The corrected table is included in the erratum, with values that have been changed in bold. (The following abstract of the original article appeared in record 1998-11674-011.) This study developed and tested a Transmission Deficit hypothesis of how aging affects retrieval of orthographic knowledge. Young, older, and very old adults heard a tape-recorded series of difficult-to-spell words of high and low frequency, spoken slowly, clearly and repeatedly, and wrote down each word at their own pace. With perceptual errors and vocabulary differences factored out, misspellings increased with aging, especially for high-frequency words. In addition, data from a metamemory questionnaire indicated that the oldest adults were aware of their declining ability to spell. These findings were not due to general slowing, educational factors, hours per week spent reading, writing, or solving crossword puzzles, or age-linked declines in monitoring or detecting self-produced errors. However, the results fit Transmission Deficit predictions, and suggested an age-linked decline in retrieval of orthographic knowledge that resembles age-linked declines in spoken word retrieval observed in many other studies. Practical implications of this age-linked decline for conceptions of normal aging are noted. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

浅谈电解系统设备备件的改进

本文针对电解槽上部结构以及多功能天车中的气动元件改进加以论述,所做的改进在实践中得到充分验证,并取得明显的经济效益。此项改进可在同行业中加以推广运用。     

SiCw／6061Al复合材料时效机制的研究

研究了ＳｉＣ晶须增６０６１铝基复合材料及基体合金在１７０℃和１９０℃时效时的析出行为,结果表明：复合材料达到峰时效的时间均较基体合金有所提前。ＴＥＭ观察发现：复合材料基体中的位错密度明显高于相应铝合金;达到峰时效时前者析出相的数量明显少于后者,而前者析出相的尺寸却明显大于后者,分析了复合材料基体中高密度位错析出相形核和长大的影响。     

影响光纤温度传感器应用的两个主要因素

从光纤温度传感器出生,并在我们长期实验的基础上,分析了大多数光纤传感器难以走向实用化的原因,并提出了一定的处理方法和建议。我们认为,光纤传感器在推广应用上受到制约的重要原因是其长期稳定性和可靠性存在着问题,影响稳定性和可靠性的两个主要因素是光源输出光功率的漂移和光纤保护层的老化,尤其是位于待测区域的探头、敏感光纤和接续光纤的保护层老化问题限制了光纤传感器的应用。     

埋地钢质管道石油沥青防护层老化机理猜想

以猜想方式描述分析了埋地长输管道石油沥青防护层的老化机理,解释了石油沥青防护层老化过程中实际存在的一些现象,为研究探讨长输管道石油沥青防护层老化过程提供了思路.     

Age-Related Changes in the Matrisome of the Mouse Skeletal Muscle

Aging is characterized by a progressive decline of skeletal muscle (SM) mass and strength which may lead to sarcopenia in older persons. To date, a limited number of studies have been performed in the old SM looking at the whole, complex network of the extracellular matrix (i.e., matrisome) and its aging-associated changes. In this study, skeletal muscle proteins were isolated from whole gastrocnemius muscles of adult (12 mo.) and old (24 mo.) mice using three sequential extractions, each one analyzed by liquid chromatography with tandem mass spectrometry. Muscle sections were investigated using fluorescence- and transmission electron microscopy. This study provided the first characterization of the matrisome in the old SM demonstrating several statistically significantly increased matrisome proteins in the old vs. adult SM. Several proteomic findings were confirmed and expanded by morphological data. The current findings shed new light on the mutually cooperative interplay between cells and the extracellular environment in the aging SM. These data open the door for a better understanding of the mechanisms modulating myocellular behavior in aging (e.g., by altering mechano-sensing stimuli as well as signaling pathways) and their contribution to age-dependent muscle dysfunction.