浅谈沥青混合料搅拌设备选型问题

通过对目前各种沥青搅拌设备性能的比较和分析,确认设备选型的方法。     

创建学习型图书馆的实践与思考

文章分析了创建学习型图书馆的意义 ,论述了创建学习型图书馆的途径 ,提出了创建学习型图书馆中应注意的几个问题     

Characterization of normal tidal breathing flow-volume loops for Thoroughbred horses

The purpose of this study was to characterize the normal equine tidal breathing flow-volume loop (TBFVL). The study was performed using 18 healthy Thoroughbred horses. TBFVLs constructed from data collected from resting horses had a typical biphasic inspiratory and expiratory phase. The interindividual variability of the indices used to describe TBFVLs was in the range 16–32%, which is comparable to the variability of other measures of equine pulmonary mechanics. The large variability of these data probably limits the value of resting TBFVL indices for detecting subclinical respiratory conditions in individual horses. Factor analysis of these data revealed that in excess of 90% of the variance of the initial response variables could be explained in terms of three common factors. Varimax rotation of these three common factors provided three subsequent factors that were readily identifiable as (1) a factor describing the time-volume relationships of TBFVLs, responsible for 81% of the total variance, (2) a factor explaining the expiratory portion of the TBFVL, explaining 12% of the variance, and (3) a factor describing the inspiratory portion of the loops, responsible for the remaining 7% of the variance. The analysis also provided standardized factor scoring coefficients for use in subsequent studies using similar experimental techniques.Abbreviations EF₂₅ expiratory flow at expiratory volume plus 25%V _E - EF₅₀ midtidal expiratory flow - f respiratory rate - IF₂₅ inspiratory flow at 25% of inspiratory volume - IF₅₀ midtidal inspiratory flow - MSA measure of sampling adequacy - PEF peak expiratory flow - PIF peak inspiratory flow - TBFVL tidal breathing flow-volume loop - T _E expiratory time - T _I inspiratory time - USPTM ultrasonic pneumotachometer - V _E expiratory volume - V _I inspiratory volume     

锅炉房设备布置及锅炉型号、台数选择

介绍了锅炉房的布置要求以及锅炉型号、台数的选择。     

猪链球菌2型纤连蛋白/血纤蛋白原结合蛋白 全基因的克隆及融合表达

采用发表的引物对,以猪链球菌2型（Streptococcus suis type 2）江苏分离株HA9801的基因组DNA为模板,采用PCR方法扩增纤连蛋白/血纤蛋白原结合蛋白基因fbps（GenBank登录号为AY565303）克隆于pMD-T18载体构建成载体pMD-T-fbps.经内切酶酶切和测序鉴定后,将由pMD-T-fbps内切酶切下的片段定向克隆于表达载体pET-32a（＋）,得到重组质粒pfbps.将重组质粒pfbps转化大肠杆菌（Escherichia coli）BL21株,经IPTG诱导,可高水平地表达相对分子量为83 kD的融合蛋白.配体印迹结合试验表明,表达的融合蛋白可与人纤连蛋白结合.     

旱作红豆草人工草地建植管理利用技术的研究

在天山北坡山地草原和山地荒漠草原过渡地带,进行旱作红豆草人工草地的研究和大田生产结果表明:在建植中对地形选择、抓苗、保苗的管理和刈割技术等措施的配套实施,是保证稳产高产的关键。     

SC-2053对小麦不同基因型杀雄效果研究

２ａ田间试验表明， 杀雄剂ＳＣ－２０５３对小麦具有良好的杀雄效果，但不同基因型所需的杀雄剂量、杀雄时期及杀雄效果不同，敏感基因型所需剂小，适宜时间长、杀雄效果好且稳定，适宜做化杀母本；普通基因型需较高的药物剂量和准确喷药时间，不宜用化杀母本。     

混合型锯链的研究

混合型锯链是由直齿式锯链的切齿和刨齿与刨刀式锯链的刨旋齿组合而成。在东北林区使用多年,受到普遍欢迎。本文利用T-2型链锯切削试验台对这种锯链进行了试验和测定。试验表明,混合型锯链横截红松和槭木时,锯截效率高于刨刀式;横截紫椴和硬桦时,前者低于后者,但高于直齿式锯链。斜截时,混合型锯链的跑偏量大于刨刀式,小于直齿式,但锯截效率下降很小。可见混合型锯链优于直齿式锯链,适于伐木作业。混合型锯链有各种功能的锯齿,故平均每齿受力小。     

Problems of Breeding for Improved Standing Ability in Dried Peas, Pisum sativum L.

Standing ability is a major component of combining ability and yield stability in dried peas. In performance trials during 1986–1988 commercial varieties and new breeding lines were evaluated for standing ability at one location. Standing ability was measured by visual scores, crop height and standardized crop height (crop height in percent of plant length) at several observation dates during the generative phase. Visual scoring proved to be the most suitable method for the measurement of standing ability as far as time requirement and precision are concerned.
Considerable differences between years and varieties were found for both the course of lodging during the generative phase and the standing ability shortly before harvest. Several, at least three or four measurements of standing ability should be done during the generative phase. Also highly significant variety x year interactions were observed. Heritability values estimated for different parameters of standing ability were medium to high as compared to plant length and maturity date (high) or grain yield (low).
In general, standing ability of the semi-leafless varieties proved to be much better than standing ability of the conventional ones. However, the semi-leafless plant type was not always associated with an improved standing ability.
Problems relating to the methods of measurement of standing ability, its phenotypic expression and variability are discussed.     

Changes in ripening behavior of ‘d'Anjou’ pears (Pyrus communis L.) after cold storage

‘d'Anjou’ pear fruit, harvested at optimum maturity with flesh firmness of 6.8 kg, were stored at ?1.1°C. Fruit were ripened at 20°C for 15 days following storage for 1–8 months. Dessert qualities were evaluated organoleptically on Day 10 of each ripening period. Changes in fruit firmness, extractable juice, titratable acids, solubl solids, respiration, ethylene production and internal ethylene were determined daily during each ripening period. Fruit firmness declined continually from 6.8 kg at harvest to 4.5 kg after 8 months of storage. Fruit stored for 2–8 months softened with a similar pattern during a 15-day ripening period at 20°C, while fruit stored for 1 month softened at a slower rate during ripening to 3.2 kg, with a coarse and dry texture after 15 days at 20°C. Fruit stored for 2–4 months ripened with the desirable buttery and juicy texture, while those stored for more than 5 months ripened with a coarse or mealy and dry texture. The buttery and juicy texture was highly correlated with a lower extractable juice, which could be used for quantitative determination of storage life based on ripened fruit quality. Changes in titratable acids and soluble solids during each ripening period were not associated with changes in dessert qualities of the ripened pears. Rates of respiration, ethylene production and internal ethylene during ripening at 20°C varied with duration of storage, but were not associated with changes in dessert qualities of the ripened fruit.