中国石油科技创新基地石油工程技术研发中心暖通空调系统设计

介绍了该项目的暖通空调系统设计,重点叙述了冰蓄冷冷源系统、热源系统、空调水系统、空调通风系统以及节能措施的设计。分析了冷热源的设置方式和实验室(含P2实验室)的通风方式,对该项目空调运行过程中出现的问题和解决方案进行了论述,给出了主要设计示意图。     

医学实验室空调通风系统能效提升技术研究

基于医学实验室负荷及其运行特点,分析了医学实验室空调通风系统的能效提升技术,包括排风能量回收、被动式新风机组、通风系统划分及控制等。重点围绕占实验室能耗比例较大的新风系统,结合项目案例,针对不同技术的特点、适用场合、节能效果评价及设计要点进行了分析。     

成都某城市综合体商业中心暖通空调设计

介绍了某城市综合体商业中心空调冷热源配置方案、空调系统形式、通风和防排烟设计、空调自控及空调节能措施,最后提出了该项目的设计体会.     

暖通空调低碳节能技术应用的案例分析

本文以某项目为例,探讨了在其空调系统中应用的低碳节能技术。从空调冷热源系统、变频调速、热回收、置换式通风、多元通风、可再生能源利用等方面,对其节能技术进行了具体的研究与分析。并对该项目的室内空气质量、能耗情况进行了分析,证明了其节能效果比较显著。     

广州某园区暖通空调设计的技术要点探析

针对广州某园区暖通空调设计过程,从系统冷热源、空调水系统、通风系统、防排烟系统及节能设计等方面详细介绍了暖通空调设计的技术要点,最终保证了设计的可行性和科学性,可为今后同类型项目提供参考.     

兰州某五星级酒店通风与空调系统设计与分析

五星级酒店的通风与空调系统往往规模大,要求高,设计内容多,是当前民用建筑空调系统设计中的重点和难点之一。本文从中央空调系统设计、通风与防排烟系统设计及空调系统节能与环保设计等方面,对兰州市某五星级酒店的通风与空调系统进行介绍,突出了该空调系统技术领先、运行高效、节能环保的特点,为同类空调系统设计提供一定的技术参考。     

某大学解剖实验室通风空调系统改造

通风空调系统对改善人体解剖实验室工作环境,有效控制甲醛污染起到了至关重要的作用,本文以某大学人体解剖实验室通风空调系统改造项目为例,介绍了该工程的空调设计方案、通风方式、气流组织形式、空气净化原理以及系统控制工艺,为类似项目的设计提供参考。     

某综合体建筑暖通空调设计简介

文章总结多个城市综合体项目暖通设计经验,分别从冷热源配置、空调水系统与风系统、通风防排烟设计等方面出发,介绍了该项目暖通空调设计要点,并简述了水蓄冷空调系统、空调热回收、免费供冷等空调节能在设计中的做法。     

变频节能技术在地铁通风空调系统中的应用研究

本文主要通过探索与寻求地铁通风空调系统所采用的变频调节的工作原理,研究与分析该技术在地铁通风空调系统中应用的有效性、科学性以及节能效果。随着我国科学技术的不断发展,目前已设计出了变风量空调通风系统,在变风量系统中排热风机、空调冷风机、水泵都使用变频控制,控制算法与地铁BAS深度融合,各机构协调运行,该节能技术有较好的经济效益和社会效益,可用于老线路的改造或新线路的设计建设,对我国地铁行业的发展起着至关重要的作用。     

东北大厦空调系统的绿色节能设计

通过东北大厦改造项目中空调系统的设计和使用,对中央空调冷热源、空调水系统、空调风系统、通风及防排烟系统等方面的绿色节能设计进行了论述,从而体现了绿色节能设计理念在实际工程中应用的可行性和实用性。     

Iodine-129 in thyroid and urine in Ukraine and Denmark

Human thyroids collected from Gomel in Belarus, sheep thyroid from Jutland and human urine from Zealand in Denmark were analysed for 129I and 127I concentrations. The ratios of 129I/127I in human thyroid in Gomel are 2.65-11.0 x 10(-9) with an average of 7.21 x 10(-9), which is one order of magnitude higher than those from Asia and South America (10(-10)), but significantly lower than those observed in west Europe (10(-8)). A weak negative correlation (P < 0.05) between 129I/127I ratio in human thyroid and the age of the subjects was observed in Gomel. The average ratio of 129I/127I in sheep thyroids from Jutland of Denmark is 1.81 x 10(-7), which is two orders of magnitude higher than those in south hemisphere, and Asia. It is also significantly higher than those observed in other west European countries before 1984 and that in human thyroid in Gomel. The high thyroid 129I level in Jutland is attributed to the release of reprocessing plants in France and UK. The 129I/127I ratios in human urine in Zealand of Denmark are 0.86-2.86 x 10(-8). The possibility of using urine 129I to evaluate the thyroid exposure to 129I is investigated.     

Vanadium in foods and in human body fluids and tissues

Using neutron activation analysis, vanadium was analysed in a range of foods, human body fluids and tissues. On the basis of these results and those of other workers, it was concluded that daily dietary intake amounts to some tens of micrograms. Analysis of body fluids (including milk, blood and excreta) and organs and tissues provided an estimate for the total body pool of vanadium in man of about 100 μg. Vanadium was not detectable in blood and urine at the level of 0.3 ng/g, while low levels were found in muscle, fat, bone, teeth and other tissues. The relationship between dietary intake to pulmonary absorption is discussed in relation to the occurrence of vanadium in man-made air particulates. The very low levels found in milks and eggs suggest minimal vanadium requirements in growth. The findings are discussed in the light of previous results and also in relation to the possible essentiality of vanadium.     

儿童青少年近视的防控研究进展

儿童青少年近视率一直处于高位并持续上升,严重影响了我国儿童青少年的学习和生活,本研究通过查阅国内外治疗儿童青少年近视相关著作及文献,针对目前儿童青少年近视防控手段的进展,对各治疗方案进行分析和研究。     

Perchlorate in raw and drinking water sources in England and Wales

A well‐known use of perchlorate is as a rocket fuel propellant; however, more widespread uses include in munitions and fireworks, and it also occurs naturally. Perchlorate suppresses the thyroid, which can lead to a variety of adverse effects. It is a widespread contaminant in the United States, but limited occurrence data in the United Kingdom exist, and even less for drinking water. Monitoring of 20 raw and treated drinking water sites in England and Wales, covering four seasonal periods, showed that perchlorate is a low‐level background contaminant of raw and treated drinking water. Low concentrations (treated drinking water: <0.020–2.073 μg/L, mean 0.747 μg/L) were detected at every higher‐risk site. The concentrations were comparable in each of the four sampling exercises and no significant trends were apparent relating to the time of year, the type of risk or the method of chlorination. Limited data showed that removal by ion exchange and granular‐activated carbon may occur.     

Lead and cadmium contents in cereals and pulses in north-eastern China

It is known that, unlike Japanese, Koreans or southern Chinese who depend on rice as a major source of energy for daily life, people in north-eastern China rely not only on rice, but on wheat and other cereals and to a lesser extent also on pulses. Cereal and pulse samples were collected from open markets in north-eastern China, and analyzed by inductively-coupled plasma spectrometry (ICP-MS) for two potentially hazardous heavy metals — lead (Pb) and cadmium (Cd). The average Pb level in cereals (31.3 ng Pb/g as a geometric mean) and that of pulses (25.7 ng Pb/g) were similar to each other with no significant difference. Among the cereals, Pb contents were higher in foxtail millet (54.3 ng/g) and lower in maize (35.4 ng Pb/g; grain and flour in combination), wheat flour (28.8 ng Pb/g) and rice flour (22.7 ng Pb/g). Lead levels in two important types of pulses, kidney bean and soybean (24.6 and 30.8 ng Pb/g, respectively), were comparable to the levels in rice and wheat. In contrast, Cd levels were substantially higher in pulses (55.7 ng Cd/g) than in cereals (9.2 ng Cd/g), and among the pulses, Cd in soybean (55.7 ng Cd/g) was significantly higher than that in kidney bean (23.8 ng Cd/g). The possible public health implication of the Pb and Cd levels, especially the high Pb level in foxtail millet (54.3 ng Pb/g) and the high Cd level in soybean (73.5 ng Cd/g), is discussed.     

广义文脉与规划设计教育

城市规划设计教育不仅应关注历史化,还应关注自然、社会和经济;不仅应关注地方和传统,还应关注全球和未来。城市规划教育应掌握正确的发展观和方法论,肩负起发展地万脉的历史使命,保护社会公众的利益,推动城市持续发展。     

德国城乡景观与中国景观问题

2003年,笔者获得德国DAAD(德国国际学术交流基金会)奖励资助,作为访问学者在德国逗留了4个月(4月～8月).在这期间,笔者还考察了法国、丹麦、瑞典和意大利,但我认为还是德国的景观最为优雅和美丽.     

大长度大高度大吨位现浇段支架设计与施工

针对世界最大跨径连续刚构桥——重庆石板坡长江复线桥3、4号现浇段超长、超高、超重的特点,介绍了现浇段支架方案设计、计算和预拉及混凝土浇筑施工工艺及组织、控制措施。     

中国菜——中美两国大不同

<正>中国食物很受美国人的青睐。有人说美国的中餐和中国本土的菜肴大相径庭。那么究竟不同在哪里呢?用餐的感受在中国的餐厅用餐与在美国的餐厅用餐的感受是不同的。两者的氛围与菜单完全相反。在中国的餐厅,你会发现菜单上布满了花花绿绿的诱人图片。中国人点餐通常是根据图片来点的。但在美国,人