WX型可调喷射器在炼油厂污水浮选中的应用

本文介绍了采用WX型可调喷射器后可使炼油厂污水处理的传统浮选工艺流程大为简化。试运行结果表明：这项新措施既提高了浮选效果又降低了能耗，并且能够长周期平稳运行，从而提高了浮选后的水质，确保污水处理正常运行，同时经济效益可观。     

An event study on the concealment of the blending ratio of waste paper

We conducted an event study on the concealment of the blending ratio of waste paper with virgin pulp in Japan. By investigating 10 companies in the paper industry between May 30, 2007 and January 18, 2008, we clearly show that stock prices of the relevant companies were affected by the news on the concealment of the blending ratio of waste paper. In addition, the impact of the second event was found to be greater than that of the first event. Therefore, the concealment of major companies negatively affects the stock prices of non-major companies, which did not conceal information during this period. Thus, bad news is negatively assessed by the market, and this influence has spread in the paper industry in general.     

文氏管除尘器碗形喷嘴的试验研究及工作特性的预测

本文根据流体动力学的流体流阻定律，对三种规格的碗形喷嘴试验数据进行分析研究，找出了预测喷嘴工作压强（Ｐ）与喷射流量（Ｑ）关系的两种方法。同时也给出了喷射角（β）和水力效率的计算公式。另外，对改进喷嘴结构提出了初步设想。     

如何加强劳防用品的监督管理

加强劳防用品的监督管理，保障从业人员的安全与健康，是国务院赋予国家安全生产监督管理总局(以下简称“总局”)的职责。2004年，随着国家机构改革的推进，国家对劳防用品的监管制度进行了调整，取消了自上个世纪80年代末以来国家实行的“特种劳防用品安全生产许可证”制度，给一直负责劳防用品监管的安全生产监管部门的监管工作带来了影响。     

Fluorescence immunoassay using an optical fiber for determination of Dermatophagoides farinae (Der f1)

Immunoassay methods are generally used for measuring of allergenic substances. However, they need special facilities, skilled handling, and time-consuming procedure. In this work, a fiber-optic immunoassay system which could measure allergen by fluorescent intensities of immune complexes formed by allergens and fluorescently labeled antibodies was established. Immune complexes absorbed on the optical fiber probe surface, and excitation light was injected into the probe, then evanescent field is created in the proximity of the probe. The fluorophores were excited by the evanescent light, and fluorescence was detected by a photo diode. The target allergen detected by our system was Der f1 derived from Dermatophagoides farinae that is one of the house dust mite and major source of inhaled allergens. The fluorophore used labeling on detecting antibody was cyanine 5. The system enabled to detect and quantitatively determine of Der f1. The measurement range was from 0.24 to 250?ng/ml, and the result competes with ELISA. The measurement time was 16?min/sample. The immunoassay system was applied to measurement of Der f1 from actual dust samples. Calculated values of Der f1 showed good correlations between the fiber-optic fluoroimmunoassay and ELISA.     

Degradation of dibromophenols by UV irradiation

We examined the degradation of dibromophenols （DBPs）, i.e. 2,4-DBP, 2,6-DBP and 3,5-DBP by ultraviolet （UV） irradiation and estimated the relationship between degradability and molecular orbital properties of each dibromopbenol. The removal of DBPs under a UV lamp system was successfully performed in an aqueous solution. After 5 min of irradiation, the initial DBPs concentration of 20 mg/L was decreased to below 1 mg/L, and about 60% of bromide ion was released. A decrease in the concentration of dissolved organic carbon （DOC） suggested the mineralization of DBPs, The mineralization may occur after release of bromide ions because the decrease of DOC was slower than the release of bromide ions. The degradability of 3,5-DBP was slightly lower than 2,6-DBP and 2,4-DBE Molecular orbital calculation suggested that the electrophilic frontier density and the highest occupied molecular orbital （HOMO） energy may be related to the degradability of DBPs.     

Concentrations of chlorine, bromine and iodine in Japanese rivers

Concentrations of halogens (Cl, Br and I) in 30 Japanese rivers were measured by ion chromatography and inductively coupled plasma mass spectrometry to understand their behavior in the terrestrial environment. Concentrations of Cl, Br and I in each river, obtained at 10 sampling points from the upper stream to the river mouth, tended to increase near the river mouth. The ranges of geometric means of Cl, Br and I in each river were 1.0–19.4 mg l⁻¹, 2.5–67.9 μg l⁻¹, and 0.18–8.34 μg l⁻¹, respectively. To compare halogen behavior, the concentration ratios, Br/Cl and I/Cl, were calculated. The Br/Cl range was (2.3–7.8) × 10⁻³ (geometric mean: 3.74 × 10⁻³), and it was nearly constant except for the Yoneshiro river. It was estimated that 60–80% of total Br in the middle to lower parts of this river was the excess Br. The Br chemical form in all the rivers is generally considered to be Br⁻. The I/Cl ratios had different trends in rivers flowing into the Japan Sea and Pacific Ocean, possibly due to the different geological features in the river catchments.     

生物接触氧化预处理对强化后续常规工艺的试验研究

研究了生物接触氧化预处理对后续常规处理工艺(混凝、沉淀和砂滤)除污染作用的强化效果.试验结果表明生物接触预处理的后续沉淀池和砂滤池均有较好的除污染效果;常规处理工艺对CODMn、TOC(总有机碳)、UV254(254nm紫外吸收)和氨氮的平均去除率分别为33.63%、32.17%、33.66%和79.41%;当原水氨氮不超过5mg/L,可以控制最终出水的氨氮浓度在0.5mg/L以下;砂滤池的出水浊度平均值小于1NTU,适当的含氯水反冲洗对砂滤池的除污染效果没有明显的影响.生物接触预处理出水的溶解氧一般在5.46～8.0mg/L,可以保证后续工艺中微生物的正常生命代谢活动需要.     

Assays of PCB congeners and organochlorine insecticides with the transgenic Arabidopsis and tobacco plants carrying recombinant guinea pig AhR and GUS reporter genes

Certain congeners of polychlorinated biphenyls (PCBs) and organochlorine insecticides are ligands of aryl hydrocarbon receptors (AhRs) in animals. A recombinant guinea pig (g) AhR, XgDV, was constructed by fusing the ligand-binding domain of gAhR, the DNA-binding domain of LexA, and the transactivating domain of VP16. Then, the expression unit of β-glucuronidase (GUS) reporter gene regulated by XgDV was introduced into Arabidopsis and tobacco plants. When the transgenic Arabidopsis XgDV plants were cultured on Murashige-Skoog (MS) medium containing PCB congeners, the GUS activity in the plants increased toxic equivalent (TEQ)-dependently. The GUS activity in the transgenic Arabidopsis XgDV plants cultured on MS medium containing the organochlorine insecticide dieldrin was also induced. On the other hand, in the case of DDT, the GUS activity induced by 3-methylcholanthere in the plants decreased. The transgenic Arabidopsis XgDV plants detected 1000 ng g(-1) PCB126 in 1 g of soils. Thus the XgDV plants seemed to be useful for convenient assays of PCB congeners and organochlorine insecticides, without any extraction and purification steps.