青泽紧密纺纱机技术特点及应用实践

探讨德国青泽700型紧密纺纱装置以及相关工艺参数配置.介绍了紧密纺纱机的结构与性能特点.通过合理配置前纺各工序纺纱工艺及采取有关技术措施,并对紧密纺纱机集聚负压和粗纱横动等工艺参数进行了试验与优选,结果使CJ 7.3 tex紧密纺纱质量达到了较好的水平.     

The relative neighbourhood graph of a finite planar set

The relative neighbourhood graph (RNG) of a set of n points on the plane is defined. The ability of the RNG to extract a perceptually meaningful structure from the set of points is briefly discussed and compared to that of two other graph structures: the minimal spanning tree (MST) and the Delaunay (Voronoi) triangulation (DT). It is shown that the RNG is a superset of the MST and a subset of the DT. Two algorithms for obtaining the RNG of n points on the plane are presented. One algorithm runs in 0(n²) time and the other runs in 0(n³) time but works also for the d-dimensional case. Finally, several open problems concerning the RNG in several areas such as geometric complexity, computational perception, and geometric probability, are outlined.     

具有时滞的耦合Hindmarsh-Rose神经元系统的放电模式

基于在无时滞的情况下,非全同的Hindmarsh-Rose耦合神经元达到几乎完全同步的放电模式,通过数值模拟的方法,研究了时滞对耦合Hindmarsh-Rose神经元同步后放电模式的影响.结果表明时滞使得神经元的放电模式发生改变,同时时滞的增加能够诱导簇中的峰逐渐地减小或消失.这一研究将有助于我们更深入地了解时滞对耦合神经元系统行为的影响.     

梳棉机加装梳针分梳板对涤纶纱质量的影响

探讨梳棉机刺辊下加装梳针分梳板对涤纶纱质量的影响。在梳棉机刺辊下分别加装小漏底和梳针分梳板,在820 r/min、1 054 r/min和1 290 r/min三档刺辊速度条件下,分别对其所加工的纱进行了条干和强力的检测。结果表明:与刺辊下配置小漏底相比,加装梳针分梳板更有利于成纱条干的改善,对降低成纱千米细节效果较为明显,在刺辊速度为1 054 r/min时对成纱千米棉结有十分明显的改善作用,但对成纱千米粗节并没有改善作用。认为:加装梳针分梳板对成纱强力和强力不匀率在刺辊速度较低时有一定的改善作用。     

Influence of adjuncts as a debittering aids in encountering the bitterness developed in cheese slurry during accelerated ripening

An attempt was made to accelerate the flavour development in cheese base with the help of exogenous proteolytic and lipolytic enzymes (1:1 proportion, each at the rate of 0.025% by weight of cheese‐base) and ripening at elevated temperatures (i.e. 20 ± 1 °C) for up to 12 days. To counter the bitterness developed, adjunct cultures were used: viable or attenuated (freeze‐shocked or heat shocked). Study of biochemical characteristics, electrophoretic pattern and sensory evaluation of the product were carried out. An acceptable enzyme‐modified, lightly salted cheese base was obtained using 0.025% each of proteolytic and lipolytic enzymes, along with 5% starter culture and adjuncts followed by ripening up to 12 days. Freeze‐shocked adjunct Lactobacillus helveticus produced enzyme‐modified cheese base with no detectable bitterness. The usage of exogenous enzymes, temperature of ripening, ripening period and interactions amongst these parameters had significant (P < 0.01) influence on all of the biochemical characteristics monitored.     

CHARACTERIZATION OF BREWING YEAST STRAINS BY NUMERICAL ANALYSIS OF TOTAL SOLUBLE CELL PROTEIN PATTERNS

Total soluble cell proteins from 33 yeast strains from the brewing industry were extracted and subjected to polyacrylamide gel electrophoresis. Yeast strains were grouped by computerized numerical analysis of protein banding patterns. Three clusters were obtained at r>0.90. Cluster I contained 21 Saccharomyces cerevisiae lager beer strains. Cluster II comprised two strains isolated from beer with a phenolic off flavour and a third strain used for lager beer brewing. Cluster III consisted of two bottom ale yeasts. Protein patterns of yeast strains within each cluster corresponded closely or were identical. However, the intensity of certain bands often varied and the number of peaks recorded was not identical. These minor differences were reproducible and regarded as characteristic for the specific strains. Protein patterns can therefore be used to characterize or fingerprint individual yeast strains.     

Developing English domestic occupancy profiles

ABSTRACT

Occupancy patterns are necessary to estimate energy demand and evaluate thermal comfort in households. Because of this, many European countries are developing representative domestic schedules to replace outdated criteria. This paper evaluates the state of knowledge of UK domestic occupancy patterns and develops new domestic occupancy profiles for England. The presented research (1) characterizes methods for collecting occupancy data and inferring patterns; (2) identifies and assesses the quality of categories of occupancy patterns used in building simulation; and (3) develops updated occupancy profiles. A systematic scoping review identified social and monitoring surveys as the most deployed data-collection methods. A systematic literature review also established that the occupancy categories most frequently used in UK building simulation are (a) a family with dependent children where the parents work full time; and (b) a retired elderly couple who spend most of their time indoors. The interview sample from the English Housing Survey 2014–15 was used to map household typologies. Results show that categories (a) and (b) combined amount to only 19% of England’s households, which suggest models are over-reliant on these groups. Considering this result, the paper develops occupancy patterns for England derived from 2015 UK Time Use Survey diaries for each household typology previously identified.     

Turbidity control and fisheries enhancement in a bottomland hardwood backwater system in Louisiana (U.S.A.)

In response to a noticeable decline in recreational fishing in the formerly productive Larto—Saline backwater complex of east central Louisiana, a study was begun to identify causative factors for the decline and to determine effective methods to remedy the problem. To this end, water quality and fisheries surveys were conducted in the system for the study period 1 July, 1981 to 30 June, 1989. Data collected during the early years of the study indicated chronically high turbidity (> 100 FTU) to be the major factor limiting game fish production. The high turbidity can be related to man-made alterations of natural flood patterns that had changed the major source of backwater flooding from Black River to the highly turbid Red River. In September, 1986, a construction project was undertaken to restore flood patterns to approximate natural conditions. Sampling subsequent to this construction has shown a significant decrease in turbidity and an increase in game fish production.     

基于不定长系统调用序列模式的入侵检测方法

提出了一种不定长序列模式的寻找算法,目标是从训练序列中找出一组基本的、相对独立的不定长序列模式。并在模式集的更新过程中自动定义了模式间的前后次序关系,以此构建了一个描述进程执行模式的DFA。针对已有基于不定长序列模式的模式匹配算法需要向前预测若干个系统调用号的缺点,文章设计了一个更好的模式匹配算法。实验结果表明,算法在模式寻找过程中是稳定的,并在保持一组规模很小的模式集的情况下,取得了很低的误报率和漏报率。