水源热泵在户式中央空调系统的应用前景

水源热泵广泛应用在大中型的中央空调中,但在户式中央空调的应用中受到了一些因素的制约。为此,通过工程实例技术性和经济性的比对分析,指出了水源热泵技术应用于户式中央空调的可行性,对水源热泵技术的发展前景进行了展望。     

Geographical Distribution of African Mammals

This is a report of a marine predator (the white shark) being threatened by a member of the species on which it preys (a male Cape fur seal). Although these events may be rarely observed or occur infrequently, they may have important implications for the predator and its prey.We suggest that shark mobbing by adult male Cape fur seals is adaptive for the reduction of risk of predation by sharks. Mobbing of sharks is likely to alert conspecifics to the presence of a predator, and/or reduce the shark's hunting motivation near the mobbing site.     

国际航站楼空调机组冬季供暖存在的问题和解决措施

指出了机场国际楼商务空调机组存在的问题,分析了这些问题的成因,提出了解决问题的措施。     

赤桉半干材的窑干与调湿处理工艺

针对移行材和早材皱缩等主要气干缺陷,拟定出赤桉半干材的干燥工艺,窑干前进行回复皱缩和减小表面硬化的汽蒸处理,窑干至目标含水率时进行终了调湿处理.结果表明:汽蒸预处理可以有效地回复皱缩材和显著地减小表面硬化;5 d内将试材的平均含水率25.61%下降到11.72%;3 h的汽蒸处理和24 h的湿空气处理均可有效地减小含水率梯度和残余塑性变定,但后者效果更佳;板材干燥质量达到国家标准二级质量的要求.     

Assessment of hygroscopic conditioning performance of interior decorative materials IV: Sorption characteristics of wood under high relative humidity condition

The equilibrium moisture content (EMC) of six wood species under desorption conditions of 20°C and 100% 0% relative humidity (RH), and the rate of adsorption at various depths of three wood species blocks under 98% RH at 22.5°C were studied. There were no significant differences among the EMC values for these six wood species over the RH range 40% 0%, but there were highly significant differences over the RH range 100% 50% at constant 20°C. The amount of moisture absorbed in the wood decreased curvilinearly with the increase of depth in the specimens as sorption time increased, and their relation could be represented by a semilogarithmic equation. Time-dependent adsorption behavior at various depths of the wood specimens could be represented by an exponential equation as a function of the product of the difference between moisture contents at equilibrium and initial conditions and the term (1 – e^–t/). The value of of various wood species was found to increase linearly with the increased depth of the specimen and showed the following trend: hard maple (Acer sp.) > China fir (Cunninghamia lanceolata) > Japanese cedar (Cryptomeria japonica D. Don).Part of this report was presented at the 47th annual meeting of the Japan Wood Research Society, Kochi, April 1997.     

膜肩网蝽的一种新天敌—异绒螨

异绒螨(Allotrombium sp.) 在北京、山东临沂地区每年发生一代,以成螨越冬。成螨和若螨可捕食膜肩网蝽(Hegesidemus habrus Drake)若虫,对膜肩网蝽种群数量有控制作用。异绒螨越冬前不产卵,翌年春产卵,幼螨营寄生生活。菜蚜是室内饲养异绒螨的好饲料,可缩短生活历期,有利于林间释放。在杨树幼林中,以若螨与膜肩网蝽1:50释放,膜肩网蝽虫口减退率达76.01％。人工助迁成螨,在林间亦易定居。     

暴猎蝽形态特征和生物学特性的研究*

据在四川省大邑县和北京室内饲养观察，暴猎蝽１ａ发生一代，以５龄若虫越冬。卵期２７．０８±１．００ｄ。若虫共５龄，历期３３４．７５±４．３０ｄ。成虫羽化后１６～１８ｄ交配，交配后１８～１９ｄ开始产卵。描述了各虫态形态特征。记述了生物学特性。试验表明该虫是舞毒蛾、杨扇舟蛾、春尺蠖、北京杨锉叶蜂、柳毒蛾、刺槐蚜等多种林木害虫的捕食性天故。     

Analysis on Influencing Factors of Indoor Air Quality and Measures of Improvement

Nowadays,IAQ(Indoor Air Quality) becomes a topic of general interest.This paper discusses the definition and influencing factors of IAQ and puts forward some measures for improving indoor air quality.     

浅析污泥水热深度脱水滤液的处理

采用普通的Fenton方法以及UV-Fenton方法分别对污泥水热深度脱水滤液进行了处理实验。在反应条件及药剂投加量都相同的情况下,研究表明:UV-Fenton方法对这种高浓度有机废水的处理效果更佳,去CODcr次日除率达到85%以上,而且BOD5也有所下降,反应后出水的B/C值小于0.3。