网状铝合金抑爆材料抑爆性能研究

为评价网状铝合金材料的阻隔防爆性能,基于多孔材料的阻隔防爆机理,采用抑爆材料抑爆性能测试装置和可燃气体爆炸箱及高速摄像机,研究材料在不同填充密度、不同留空率下对液化石油气的燃爆压力的影响,及液化石油气火焰在填充材料的爆炸箱中的传播过程。试验结果表明:填充密度为35 kg/m3、留空率为5%时,材料抑爆性能最好;当抑爆材料在容器内的填充密度一定时,其燃爆压力随留空率增加而增加;与未填充材料相比,填充材料后火焰衰减;此外,得到填充密度、留空率和燃爆压力间的数学拟合公式。降低留空率、增加填充密度能够更好地提高阻隔防爆性能。     

Identification of cadmium-induced genes in maize seedlings by suppression subtractive hybridization

A maize variety, Huatian-1, had an unusually low translocation rate of cadmium (Cd) (59.6 mg·kg^-1 in the roots and 0.093 mg·kg^-1 in the grain) compared to 24 other varieties while being grown in soils with 16.50 mg·kg^-1 Cd. This indicates that this particular species may have special mechanisms that affect the absorption and translocation pattern of Cd. In this paper, the technique of suppression subtractive hybridization (SSH) was used to isolate and identify Cd-induced genes from Huatian-1 hydroponically ?exposed? to? 0.1 mM ?CdCl₂ ?for? 1 h,? 12 h, 24 h, and 48 h. We found a total of 15 differentially expressed genes in the four groups; 2, 3, 4, and 6 genes were from the groups of 1 h, 12 h, 24 h, and 48 h treatment, respectively. Phospholipase PLDb1 mRNA, adenosine triphosphate (ATP) phosphoribosyl transferase 2, and Sp17 were turned on in the maize in response to Cd stress, and it might provide new clues to explain the mechanism of maize tolerance to Cd.     

彩虹粉引燃危险性实验研究

为了研究彩虹粉引燃危险性,应用固体燃烧速率试验仪初步甄别了彩虹粉传播燃烧能力,发现堆垛状彩虹粉固体火焰传播危险性较低;采用粉尘爆炸筛选装置,判定彩虹粉具有爆炸性;应用最小点火能测定装置测定彩虹粉粉尘云的最小点火能在24~60 mJ之间,最优爆炸浓度为1 167 g/m3;应用快速筛选量热仪测试,彩虹粉在227℃开始分解;固体自燃点测试仪显示彩虹粉在250℃附近会发生自燃。向彩虹粉内添加不同比例相近粒径分布的食用盐粉体进行抑爆研究,结果证明食用盐对彩虹粉具有明显的抑爆效果。     

Will climate change overwhelm fire management capacity?

Using anomalies calculated from General Circulation Model (GCM) climate predictions we developed scenarios of future fire weather, fuel moisture and fire occurrence and used these as the inputs to a fire growth and suppression simulation model for the province of Ontario, Canada. The goal of this study was to combine GCM predictions with the fire growth and suppression model to examine potential changes in area burned in Ontario due to climate change, while accounting for the large fire suppression activities of the Ontario Ministry of Natural Resources (OMNR). Results indicate a doubling of area burned in the Intensive and Measured fire management zones of Ontario by the decade of 2040 and an eightfold increase in area burned by the end of the 21st century in the Intergovernmental Panel on Climate Change Special Report on Emissions Scenarios (IPCC SRES) A2 scenario; smaller increases were found for the A1b and B1 scenarios. These changes are driven by increased fire weather conducive to large fire growth, and increases in the number of fires escaping initial attack: for the Canadian GCM's business-as-usual (A2) scenario, escaped fire frequency increased by 34% by 2040 and 92% by the end of the 21st century. Incorporating more detail on large fire growth than previous studies, our model predicts higher area burned under climate change than do these previous studies, as large numbers of high-intensity fires overwhelm suppression capacity.     

含氯化亚铁添加剂细水雾灭火有效性的实验研究

为了提高常规细水雾的灭火有效性,拓展其应用范围,本文采用小尺度实验的方法,研究了含氯化亚铁添加剂细水雾在不同燃料种类、添加剂浓度、压力下扑灭池火的有效性。实验结果表明：向细水雾中添加氯化亚铁,显著地影响了它的灭火性能;细水雾的灭火时间随着加入的氯化亚铁的质量浓度变化而发生改变,而且存在一个最短灭火时间浓度;细水雾喷头的工作压力和燃料的类型也对细水雾的灭火性能有影响,喷头工作压力越大,细水雾的平均灭火时间越短;在相同的实验条件下,细水雾灭煤油火的时间要短于灭乙醇火的时间。     

覆盖法控制城市河涌底泥磷释放研究

建立了一套包含有城市河涌底泥、覆盖材料及上覆水的小试装置,采用粉煤灰、水泥、沸石、河砂、玻璃珠等不同物质作为覆盖材料,在厌氧条件下,覆盖材料对城市河涌底泥磷释放的控制效果进行了研究.结果表明,在培养温度为25℃,覆盖材料用量为6.0kg·m-2时,玻璃珠、河砂、沸石、粉煤灰、水泥对PO43-释放的抑制率分别为40.0%、46.7%、60.0%、75.6%、88 9%;覆盖材料对PO43-的抑制作用可归结为覆盖材料的覆盖效应、化学效应和吸附效应;覆盖材料对PO43-释放的抑制率均随着温度的升高而降低;覆盖材料用量对PO43-抑制率影响较大,对于水泥、粉煤灰、沸石、河砂,要达到约50%的PO43-释放抑制率,其用量分别为2.0、2.0、6.0、10.0 kg·m-2,选用粉煤灰作为覆盖材料较合适;从重金属毒理学方面讲,覆盖材料不会对底泥及区域土壤造成影响.     

化学药剂抑尘方法的工业应用

论述了化学药剂抑尘方法的工业应用,大量的试验测试数据表明:该除尘方法投资省、运营费用低、除尘效果好、简单易操作。     

淋洗模拟研究有机盐膜抑制黄铁矿的生物氧化效果

经有机难溶盐包膜后的黄铁矿矿石接菌下间歇循环淋洗一年后其循环收集液中SO4^2-含量点供试样品中总SO4^2量的0.16%，较对照的下降了97％，pH从初始6.82下降至5.48，但对照pH却从初始的7.57下降至2.35，矿石样品经扫描电子显微镜显示：包膜的矿石样品表面仍呈光洁状，而对照的表面布满细小洞穴，清楚指出：笔者首次提出的有机盐膜能有效地抑制T．F菌对黄铁矿的氧化作用。     

新型防冻抑尘剂性能研究

在对CMl、CM2型防冻抑尘剂的抗冻性能、在自然环境中昼夜周期吸湿和放湿的行为进行了测定的基础上．为提高性能，对这两种防冻抑尘进行了复配。其研究结果对卤化物抑制路面、地面和各种散体堆放场的扬尘具有实际意义。     

电磁干扰噪声抑制片应用介绍

针对电子设备发展带来的严峻电磁兼容问题,介绍了多家国外公司新开发的电磁兼容产品--电磁干扰噪声抑制片在电磁兼容方面的应用,并通过应用实例表明该产品具有广泛的应用场合和良好的电磁噪声抑制效果,最后根据IEC 62333标准采用微带型模型分析了其应用机理.