对氧化物熔体浮区中重力对流的数值模拟

利用有限元分析方法数值模拟了界面形状对氧化物高温熔体碟形浮区中的温度分布和重力对流速率的影响，发现界面形状对重力对流速率有较大的影响，对于凸面，相对于炉圈平面5％的偏离使重力对流速率增大25％，偏离越大，重力对流速度越大，对于凹面，5％的偏离使重力对流速率减小15．7％，偏离越大，重力对流速度越小。     

Characteristics of profiled lightly-doped drain MOSFETs

Profiled lightly-doped drain (PLDD) MOSFETs are fabricated. Their characteristics are compared with those of other device structures. The current driving capability and transconductance of LDD devices can be increased with PLDD structures.     

A self-tuning controller for systems with unknown or varying time delays†

A SISO self-tuning controller with a Smith-predictor type of time delay compensator (STC-TDC) is proposed to handle open-loop stable processes with unknown or varying time delays. Two numerical examples comparing PI control, the standard STC of Clarke and Gawthrop, the self-tuning Dahlin algorithm of Vogel and Edgar, and the STC-TDC show that the new approach performs best for both set-point and load changes when process time delay changes occur. A third example shows that the STC-TDC matches the extended stability characteristics of the alternative approach due to Kurz and Goedecke but is computationally much simpler.     

黏土层中深基坑挡土墙最大变形量简易评估法

利用数值分析，研究影响黏土层中基坑挡土墙最大变形量的参数，根据参数研究的结果，利用复回归分析，给出挡土墙最大变形量的简易评估法。然后利用简易评估法，预测4个台北基坑案例的连续墙最大变形量，并与现场监测结果进行比较。结果显示：预测的最大变形量在0.85～1.15倍监测值范围内。因此，本文给出的简易评估法，可为初步预测、设计及最后检核设计成果提供参考。     

CHANGES OF POLYAMINE CONTENT IN CHINESE CABBAGE DURING STORAGE IN AIR OR LOW OXYGEN ATMOSPHERE

Endogenous levels of polyamines, including putrescine, spermidine, and spermine, were determined in the outer laminae, outer midribs, inner laminae, and inner midribs of Chinese cabbage (Brassica campestris L. Pekinensis group) during storage at 0°C in air or in 1% O₂ atmosphere. In the outer laminae where tissues were more mature, polyamines declined linearly with storage at 0°C. The content declined more slowly in low oxygen-stored samples than in air-stored samples. In the inner laminae where tissues were still meristematic, polyamines in both air- and low oxygen-stored samples showed a quadratic response and increased during the first 6 weeks of storage. Thereafter, the level of polyamines decreased under both treatments, but a higher level was maintained in the low oxygen-stored samples.     

基于数据挖掘的制造过程合格率管理体系研究

在半导体自动化制造过程中产生大量的数据,为应用数据挖掘技术进行有效的过程监控提供了条件。提出在运用数据挖掘技术中聚类分析方法的基础上,对不合格批产品的加工路径进行分析,从而准确地将控制对象定位于某些问题设备,并结合统计过程控制的手段加强监控。     

海床砂土应力分析及动态强度特性

探讨了海床土壤与陆上土壤应力状态的差异,在三轴试验中利用反水压力作为静水压力以模拟原海床水深,回复海床土壤在原海域环境中的应力状态,并探讨水深对海床砂土动态强度的影响。另外,探讨了海床砂土受到长、短波浪周期作用时,其动态强度特性。研究结果显示,水深越大,海床砂土的液化阻抗强度越低;海床土壤在长周期的波浪作用下,有较高的液化阻抗强度,同时引起海床砂土液化有一最低的门坎值。     

METHYL JASMONATE IMPROVES QUALITY OF STORED ZUCCHINI SQUASH

Freshly harvested zucchini squash (Cucurbita pepo L., cv. Elite) were pressure infiltrated (82. 7 kPa for 3 min) with an aqueous suspension solution of 0.1 mM methyl jasmonate, while control fruit were similarly infiltrated with distilled water. All fruit were then stored at a chilling temperature of 5C. Chilling injury symptoms developed in the control fruit after 4 days of storage. However, the onset of chilling injury was significantly delayed by methyl jasmonate treatment. The methyl jasmonate treatment not only retarded the development of chilling symptoms in zucchini squash, but also maintained higher levels of carbohydrates and organic acids during storage compared with the controls. Fructose and glucose were major carbohydrates, and malic acid was the predominant organic acid in zucchini squash. Methyl jasmonate reduced the losses of these sugars and organic acids, and thus helped maintain better internal quality of zucchini squash during cold storage.     

Detinning Factors from the Shoots of Bamboo Leleba oldhami

Concentrated fresh juice of bamboo shoots was filtered through a Sephadex G-75 column under aseptic and anaerobic conditions. The detinning activity in the filtrate was assayed by an oxygen monitor in the presence of tin powder. A large amount of peptides with molecular weights about 1300, some nucleotides and p-hydroxybenzaldehyde were identified as the detinning substances. Twenty peptides were isolated by means of cation and anion exchange chromatography. The primary structures of these peptides were elucidated by the subtractive Edman degradation, in which a high performance liquid chromatograph was used for amino acid and sugar analysis.