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61.
Expanded metal mesh and polymer foams of appropriate pore or cell size and sufficient surface area per unit volume can suppress deflagrations of gas/vapor–air mixtures. This paper reviews the requirements that have been established for use of these materials in military aircraft fuel tanks. Extensions and generalizations of these requirements for other applications have been developed and incorporated into the 2008 edition of the NFPA 69 Standard for Explosion Prevention. The new NFPA 69 requirements for testing, evaluating, and installing these materials are summarized here along with an explanation of the basis and rationale for these requirements. 相似文献
62.
Anne Calmon F. Silvestre Véronique Bellon-Maurel Jean-Michel Roger Pierre Feuilloley 《Journal of Polymers and the Environment》1999,7(3):135-144
In the present project, twenty materials (e.g., polyhydroxybutyrate-hydroxyvalerate, polycaprolactone, cellulose acetate, polyacticacid, polyethylene), representing varied biodegradability levels were studied. An aerobic respirometric test, based on the CEN Draft, was setup. The biodegradability of each plastic film was evaluated by measuring the percentage of carbon converted into CO2 during 35 days. The values of the CO2 production were plotted versus days as a cumulative function. In order to reduce its number of points, the cumulative curve was modeled using a sigmoïd function (Hill sigmoïd). This model was compared to one found in the literature. A
i
2
test showed that the biodegradation curve was more accurately fitted with the model than the previous one. Three kinetic parameters were determined by this Hill model: one represents the maximal percentage of carbon converted into CO2, the second the half-life time in days of the degrading part of the material and the third one the curve radius.In addition, the following analyses were carried out on each sample: elemental analysis, thickness, hydrophobicity and surface free energy measurements. In order to compress the information and to keep only relevant pieces, these parameters were submitted to a Principal Component Analysis. PCA found linear combinations of variables that describe major trends in the data. The two principal components which separate groups of materials were closely related to a chemical and a physical axis respectively. Materials showing a high biodegradability were related to high oxygen (and nitrogen) contents and low hydrophobicity: Material thickness did not influence the likeliness to biodegradability described by the maximum biodegradation rate. Finally, this study established the correlation between the biodegradation and the structure of biopolymers. 相似文献
63.
以业(SO)4和PDMDAAC为原料进行了无机-有机复合絮凝剂的复合实验研制,确定其制备工艺条件,并对油田现场采集的钻井废水作絮凝沉降实验,所研制的PAS—PDMDAAC复合絮凝剂对COD的去除效率可大大提高。 相似文献