浅谈圆型粮仓的通风设计

浅谈圆型粮仓的通风设计林业部大兴安岭管理局勘察设计院朱振刚大兴安岭地区建委韩鹏一、前言目前我国的粮食贮存主要还是以粮仓仓贮为主，其它形式为辅，这样粮仓通风设计就显得尤为重要了，我国粮仓主要有两种形式。一种为圆型粮仓，其内外均为圆型，粮仓较高，占地面积...     

矿井通风安全管理与通风事故防范研究

矿井通风不仅是煤矿开采中的一个重要组成部分,也是保障矿井安全生产的一个基本条件。矿井通风对井下工人的健康安全和矿井的经济效益与生产效益都有很大的影响。对矿井通风进行了简单的介绍,分析了矿井通风事故隐患管理,探讨了如何建立矿井通风信息管理系统。     

热电厂机械通风除尘系统设计

通过对机械通风除尘系统设计要点、抽风量的确定及除尘设备的选择几方面，论述了热电厂机械通风除尘系统的设计。     

煤矿通风系统改造技术分析

煤矿通风技术是煤矿生产系统的重要组成部分,为了确保煤矿的生产安全,提高生产效益,必须使得通风系统处于良好的运行状态。以目前煤矿业开采技术的发展,通风系统是制约产能升级的关键,煤矿通风系统的改造将具有重要的意义,为煤矿企业的更好发展打下了坚实的基础。     

浅谈诱导通风系统的优越性

本文对诱导通风的原理及其优越性进行了论述,阐明该系统用于地下车库中,可使地下车库层高降低,从而节约土建造价;另外,使用诱导通风系统可取消传统通风系统的风道,且通风效果良好。     

对煤矿通风安全制约因素的探讨

煤矿通风作为排除煤矿粉尘、瓦斯最为有效可靠的方法,其不仅是确保矿井安全作业的重要基础,也是为矿井营造一个良好工作环境的必要途径。也正因如此,进一步做好煤矿通风安全则显得尤为重要。结合多年从事煤矿通风管理的实际工作经验,对抑制煤矿通风安全的几点要素进行粗浅的探讨,提出提高煤矿通风安全,防范煤矿通风事故的几点建议,以供参考。     

加强煤矿通风安全隐患管理的措施

煤矿生产集中在井下,这一区域瓦斯和粉尘容易积累,极易导致中毒和爆炸事件,当前煤矿企业一般应采用煤矿通风系统,利用煤矿通风设备实现井下生产过程中环境质量和空气质量的改善。而煤矿通风系统在运行中会出现各类问题,导致煤矿通风出现各种安全方面的隐患,不利于煤矿生产和安全目标的实现。文章列举了排除煤矿通风系统安全隐患的措施,提供了煤矿通风加强管理的方法,希望对煤矿通风系统安全运行有所帮助。     

中天山隧道施工通风数值模拟

中天山隧道在施工中的通风布置方式及通风设备,按规范方法对其风量的各相关参数进行了计算,采用国际流行的计算流体力学有限元程序CFDesign对隧道通风系统中几个重要组成部分进行多维数值模拟研究。阐述了通风过程中遇到的一些问题及解决方法,以取得良好的隧道通风效果,为施工创造了舒适、高效的工作环境。     

浅谈地下室通风与排烟设计

从通风排烟系统划分、通风方式及通风排烟风机选择方面,介绍了高层建筑地下室通风系统和排烟系统相结合,以充分利用地下室上部空间的设计方法,包括解决从平时运行到火灾运行的可靠转换的做法。强调了风机的选择、布置及设计中需注意的问题。     

解析高瓦斯煤矿通风技术要点

大量的高瓦斯存在于煤炭矿井之中,遇到明火就会发生非常严重的安全事故,对煤矿企业的安全生产造成影响。所以,必须采取安全有效的通风技术对瓦斯进行排放,保证高瓦斯煤矿生产的安全。文章首先介绍了高瓦斯煤矿的特点与加强通风的重要性,然后介绍了均压通风技术与"B"型通风技术。     

大学体育馆空调通风系统监控设计

根据大学体育馆使用的特殊性,提出大学体育馆空调通风系统自监控的设计思想、原则、监控内容和目标,并选择合适的监控系统,采取适当的节能措施,进行空调通风系统监控设计,这里介绍了建筑设备监控系统、系统的构成、本监控系统采取的节能措施。     

松褐天牛蛹期生物学特性和有效积温的研究

松褐天牛Ｍｏｎｏｃｈａｍｕｓａｌｔｅｒｎａｔｕｓ（Ｈｏｐｅ）蛹室通气性对幼虫化蛹有显著影响;蛹室透光性对化蛹无显著影响;蛹室通气性和透光性对蛹羽化均无显著影响。经测定,在４月下旬至７月中旬,蛹的发育历期随气温升高而缩短,蛹发育的起始温度为１１．０８±０．７２℃,有效积温为１６７±１０．６８日度。     

城市污水处理厂能耗分析及节能措施

指出了城市污水处理是高能耗产业之一,其中污水提升、曝气系统和污泥处理是主要能耗源。通过分析污水处理过程中的能耗构成,指出了各阶段的节能降耗途径,并提出了污水处理厂节能管理机制。     

组合式污水处理设备在湖滨带中的应用探讨

指出了组合式污水处理设备是针对我国目前的分散型生活污水的收集和处理的实际进行开发和设计的,采用2级厌氧和2级好氧的完全混流曝气技术。从处理效率高、抗冲击负荷强、占地面积小等方面分析了组合式污水处理设备的优势,探讨了其在洱海湖滨带污水治理中的应用。     

简析重庆永川城市生活污水处理厂调试过程中的问题及对策

城市生活污水处理厂的处理效果受诸多因素影响，本文总结了重庆市永川区城市生活污水处理厂（A^2O一体化氧化沟工艺）调试中出现的问题，并逐个分析了温度、BOD5负荷、水量、曝气量、除磷剂用量等五个因素对污水处理效果的影响，并提出了相应的对策。     

Environmental influences on nitrogen transformation of different quality tree litter under submerged and aerobic conditions

Trees in farming systems can improve fertility of soils through mineralization of N in their litter. This study was to determine the quality parameters (i.e., chemical composition) of organic residues that are associated with N mineralization in soils under submerged and aerobic conditions, and to demonstrate that aeration conditions should be taken into account in categorization of organic residues as N sources in farming systems. Incubation experiments were conducted in Aeric Paleaquult soil under submerged and Oxic Paleustult soil under aerobic conditions. Treatments included litter and some fresh materials from trees as well as rice straw available in farming systems of Northeast Thailand. S. grandiflora and L. leucocephala (32 g kg⁻¹ N) had the highest net N mineralization in both conditions. Some lower-quality (< 20 g kg⁻¹ N) residues did exhibit low net N mineralization during the 16-week period under submerged conditions, but displayed almost no net N mineralization in aerobic conditions. Under submerged conditions, their net N mineralization was higher and more rapid. The nitrogen content of the residues was the most important factor controlling N mineralization under both conditions. Polyphenols exerted the highest negative influence on N mineralization in aerobic conditions, but exhibited no negative effect in submerged conditions. In categorizing organic residues for their effective use in soil fertility management, soil aeration conditions, as well as other environmental factors, should be taken into consideration in addition to residue quality.     

Soil–water content and air-filled porosity affect height growth of Scots pine in afforested arable land in Finland

We examined the soil–water content (SWC) and air-filled porosity (AFP) of afforested arable land in situ and related them with tree growth, which was expressed as the total length of 5-year-height growth above 2.5 m stem height. A total of 34 randomly selected sites in western Finland afforested with Scots pine (Pinus sylvestris L.) were sampled and SWC was measured using time domain reflectometry (TDR). Increasing AFP up to 30% and correspondingly decreasing SWC significantly increased tree growth while concentrations of foliar nutrients and contents of soil nutrients had no effect. Increasing organic matter content (OMC) and decreasing bulk density (BD) were accompanied by increasing SWC and decreasing AFP in the 0–10 cm soil layer. SWC values above 70% indicated critical AFP below 10%. It was found that 44% of the studied sites had mean AFP lower than 10%. The results obtained indicate that the afforested Finnish arable land with high soil OMC is commonly characterized by high SWC and low soil aeration, which can limit tree growth.     

Comparison of effectiveness of introduced barn owls,Tyto javanica javanica,and rodenticide treatments on rat control in oil palm plantations

Journal of Pest Science - In Peninsular Malaysia, barn owls (Tyto javanica javanica) have been utilized as biological control of rats since the 1960s. In this study, the impact of introduced barn...     

Irrigation regime affects water and aeration conditions in peat growth medium and the growth of containerized Scots pine seedings

Containerized Scots pine seedlings growing in light Sphagnum peat growth medium in a greenhouse were subjected to three irrigation treatments. The seedlings were irrigated by saturating the growth medium with a nutrient solution (i) daily or when (ii) –5 or (iii) –10 kPa medium matric potential was achieved. In general, the nutrient concentrations in the foliage of the seedlings were rather similar for all irrigation treatments. In the wet (daily) irrigation treatment, however, the foliar concentration of N was lower and the foliar concentrations of P, Ca, S, Mn and Na were higher than in the other two treatments. In the wet irrigation treatment, height growth was lower than that in the other treatments. In this treatment the shoot to root ratio and several other morphological characteristics were also reduced, while the number of root lenticels and seedling mortality were increased compared to the other treatments. Rapid growth was obtained by irrigating at –5 to –10 kPa matric potential. In the wet irrigation treatment, the median matric potential and air-filled porosity of the peat medium were –0.4 kPa and 11%, respectively, which indicated waterlogging and very suboptimal aeration to the seedlings. The respective values for the irrigations at –5 and –10 kPa were –2.7 to –3.3 kPa and 39 to 43%, which were considered to cover the range from optimum to slightly suboptimum for average water availability and aeration.