中小型转炉补炉后喷渣冒火原因分析与控制

分析了中小型转炉油砂补炉后喷渣冒火事故的形成原因,提出了预防控制对策。     

Multivariate analysis of trace metal levels in tannery effluents in relation to soil and water: a case study from Peshawar, Pakistan

Tannery effluents and relevant ground water and soil samples collected from various tanning industries of Peshawar were analyzed for Na, Ca, K, Mg, Fe, Mn, Cr, Co, Cd, Ni, Pb and Zn by the AAS method. The metal concentration data for the three media are reported in terms of basic statistical parameters, metal-to-metal correlations and linear regression analyses. Metal distributions in the three media were quite divergent and showed non-normal distributions with high standard deviation and skewness parameters. Sodium exhibited the highest mean levels of 1,277mg/L, 881mg/L and 12,912mg/kg in the effluent, ground water and soil samples, respectively. Among other metals, Cr concentrations were 410mg/L, 0.145mg/L, 100mg/kg and Ca, 278mg/L, 64.8mg/L, and 2,285mg/kg in the effluent, ground water and soil samples, respectively. Some significant correlations were observed between effluent and soils in terms of Na, Cr, Ni, Co and Pb. The ground water-soil interrelationship suggested that Na levels in the soil and ground water were significantly correlated with each other (r=0.486, P<0.01). Similarly, Cr in the soil is strongly correlated with Ca in ground water (r=0.486, P<0.01). These results were duly supported by the linear regression analysis of data. The source identification studies conducted using Principal Component Analysis (PCA) and Cluster Analysis (CA) evidenced that ground water and soil were being contaminated by the toxic metals emanating from the tannery effluents.     

松花江水污染同江段水中硝基苯、苯分析

本文通过对双苯污染带流经松花江和黑龙江的同江断面、同江东港（下列）断面及八岔断面监测分析,对同江段水质受硝基苯污染的状况作出了科学的分析评价。     

浮桶式乙炔器爆炸原因分析

指出了浮桶式乙炔器发生爆炸的 3种原因 ,提出从事该行业的人员应了解这些知识 ,以防止类似事故发生。     

煤矿液压提升机的安全功能与安全隐患分析

液压提升机是较为复杂的机电液一体化产品 ,是煤矿井下作业提升物料和运送人员的关键设备 ,素有矿井咽喉之称。液压提升机的防爆、提升过程中的超速、过卷保护、液压系统的高、低压保护及升降与制动工作协同性是其安全性设计的核心与关键。笔者概要介绍了液压提升机的主要安全保护功能 ,分析并探讨了液压提升机存在的安全隐患与对策     

Diurnal variation of number concentration and size distribution of ultrafine particles in the urban atmosphere of Beijing in winter

Number concentration and distribution of airborne particles in the size range 5.6 to 560 um diameter were measured in Beijing for a 15-d period in winter 2005.Daily average number concentrations of nucleation mode(5.6-20 nm),Aitken mode(20-100 nm), and accumulation mode(100-560 nm)particles,and total particles were 17500,32000,4000,and 53500 cm~(-3),respectively.Average particle size distribution was monomodal with a mode diameter of about 40 um at night and bimodal with mode diameters of about 10 and about 40 nm during the daytime.New particle formation events,which were connected to diurnal variation of nucleation mode particles,were observed in more than half of the observation days.The events often started around 10:00-11:00 Chinese Standard Time (CST)and ended up after 3-4 h.Concentrations of Aitken and accumulation mode particles increased from midnight and reached their maxima at about 10:00 CST,and then decreased and became the lowest in the afternoon.Analysis of diurnal cycles in traffic volume and meteorological parameters revealed that the accumulation of the particles in Aitken and accumulation modes in the morning was influenced by formation of an inversion and increase in vehicle emission,and dispersion of such particles in the afternoon was associated with more effective vertical mixing and higher wind speed.     

吉林省冰雹灾害时空分布规律及特征分析

利用吉林省５３ 个气象站１９６０～１９９６ 年的冰雹资料, 对其冰雹天气发生的气候规律、时空分布特征、地理分布差异以及冰雹直径、路径、强度等方面进行了详尽分析, 旨在为此类天气的分析预报提供背景依据     

农业气象灾害分析网络服务系统

以大量翔实的农业气象灾害资料为基础,结合实时农业气象灾情分析,在ｗｉｎｄｏｗｓＮＴＳｅｒｖｅｒ网络环境下,研制出具有网络功能的农业气象灾害分析服务系统,系统在Ｉｎｔｅｒｎｅｔ的ＮｅｔｓｃａｐｅＮａｖｉｇａｔｏｒ或Ｅｘｐｌｏｒｅｒｔｏ览器下运行,简便实用．系统以灾害服务为宗旨,体现了信息量大、服务迅速的特点。内容包括农业气象灾害类型库、逐年农业气象灾害评判库、实时农业气象灾害分析及灾情服务流程．     

人为失误原因分析与控制对策研究

研究了人为失误对系统安全的影响，分析了人为失误产生的原因及其影响因素，并就煤矿安全管理中人为失误的控制提出了针对性措施     

唐山市大气中硫酸盐化速率与SO2相关性分析

通过对唐山市１９９２－１９９４年大气硫酸盐化速率与ＳＯ２的监测数据进行分析，结果表明，两者之间显著的正相关关系，利用１０８对数据建立了线性回归分析方程，ｒ值大于０．６。