VACUUM PACKAGING OF NEW ZEALAND HOPS

Three cultivars of New Zealand hops were packaged in two ways, vacuum and non-vacuum, and stored at two temperatures, 0°C and ambient. Over the 38 week test period the degradation of Lead Conductance Value was linear for all treatments with no difference between cultivars and no evidence of a ‘safe’ or ‘delay’ period. The degradation coefficient [Lead Conductance Value (%)/week] was highest for non-vacuum packed, ambient (?0·151), followed by non-vacuum packed refrigerated (?0·077), vacuum packed ambient (?0·039) and vacuum packed refrigerated (?0·012).     

Stability regions of Schur andG-stable polynomials

The paper presents a unified approach to calculation, for a given, nominal,G-stable polynomial, a corresponding stability region in the space of perturbed coefficientsOn leave from Institute of Electrical Engineering, 04-703 Warsaw, ul. Pozaryskiego 28, Poland.     

最大值原理在制导炸弹滑翔控制中的应用

结合最优控制理论,研究了控制变量和末端状态均有约束的条件下,为了满足某个性能指标最优的要求,制导炸弹的滑翔控制问题。首先,建立了制导炸弹滑翔的最优控制模型。然后,利用最大值原理,引入共轭变量,同时消去控制变量,将最优控制问题转换为微分方程两点边值问题。最后,针对制导炸弹滑翔控制的性能指标以及对末端状态和末端时刻的特殊要求,提出了一种改进的边值打靶法,并通过仿真算例验证了算法的可行性和有效性。     

Understanding individual defects in CdTe thin-film solar cells via STEM: From atomic structure to electrical activity

Here we review a systematic study of the structure-property correlations of a series of defects in CdTe solar cells. A variety of experimental methods, including aberration-corrected scanning transmission electron microscopy, electron energy loss spectroscopy, energy dispersive X-ray spectroscopy, and electron-beam-induced current have been combined with density-functional theory. The research traces the connections between the structures and electrical activities of individual defects including intra-grain partial dislocations, grain boundaries and the CdTe/CdS interface. The interpretations of the physical origin underlying the structure-property correlation provide insights that should further the development of future CdTe solar cells.     

陶瓷封装电路内部水汽的稳定性控制

简述了集成电路陶瓷封装内部水汽含量的不稳定性,主要是由粘接材料导电胶在高温下分解释放出的水汽所造成的.不同的封装温度内部水汽含量不一样.说明导电胶应充分固化,尽可能在较低的温度下进行封盖.     

变性淀粉在午餐肉中的应用效果研究

将木薯变性淀粉与玉米原淀粉在午餐肉中的应用效果进行了对比,结果表明,添加了变性淀粉的产品在弹性、组织状态、口感及贮存稳定性方面明显优于玉米原淀粉。     

刺桐花红色素的稳定性研究

研究了刺桐花红色素的提取方法和稳定性。结果表明：用酸醇溶液提取刺桐花红色素可得到较稳定的红色素,在60℃以下、pH小于5的酸性条件下稳定性好;对有机酸、碳水化合物、多种金属离子较稳定;但对光比较敏感;在中性和碱性条件下不稳定。     

Long-term thermal stability of Ti/Al/Mo/Au ohmic contacts on n-GaN

Improved performance of the ohmic contacts on n-GaN has been demonstrated with the use of MoAu as the capping layer on TiAl metallization. Contact resistance as low as 0.13 Θ-mm was achieved in these ohmic contacts when annealed at 850°C for 30 sec. We have studied the long-term thermal stability of these contacts at 500°C, 600°C, 750°C, and 850°C, respectively. The Ti/Al/Mo/Au metallization forms low contact-resistance ohmic contacts on n-GaN that are stable at 500°C and 600°C after 25 h of thermal treatment. The ohmic-contact performance degrades after 10 h of thermal treatment at 750°C, while the contacts exhibit nonlinear current-voltage (I-V) characteristics after 1 h of thermal treatment at 850°C with the formation of oxide on the surface of the contacts accompanied by surface discoloration. The intermetallic reactions taking place in the contacts during the long-term thermal treatments were studied using Auger electron spectroscopy (AES), and the surface morphology was characterized using atomic force microscopy (AFM).     

TTS语音单元边界的自动切分

语音单元边界的准确切分对基于波形拼接的语音合成系统至关重要。文章采用了两步切分方法，第一步中先由基于HMM模型的强制对齐方法得到初始的边界．在第二步中提出用基于前后音素的边界模型来修正初始边界。为解决训练数据不足的问题，提出用分类与衰退树将前后因素发音相近的边界模型进行聚类。这样可以根据训练数据的多少，动态调节边界模型的数目，以保证模型训练的可靠性。在对中文语音库的实验中，自动切分的准确度由78．7％提高到91．5％。     

Interaction of Fragrance Materials With 2-Hydroxypropyl-beta-Cyclodextrin by Static and Dynamic Head-space Methods

The stability constants for the inclusion of fragrance materials with 2-hydroxypropyl-beta-cyclodextrin (2HP-beta-C yD) in aqueous solution have been determined by the static head-space method. The 1:1 stability constants obtained by this method were in reasonable agreement with the corresponding values in the literature. In addition, the release profiles of fragrance materials from 2HP-beta-CyD aqueous solution were investigated using the dynamic head-space method. It was found that the suppression of the fragrance materials release was dependent on their stability constants.