共查询到18条相似文献,搜索用时 281 毫秒
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详细介绍了电冰箱的工作原理和其使用方法,并且得出只有正确使用电冰箱才能延长其使用寿命,节约自然资源、电力和财力。 相似文献
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电热式自控恒温消毒干燥过滤器的消毒方法与目前采用的蒸汽及高压容器消毒方法相比,省工省时、操作方便,且使用间隔期限延长10倍以上,增强了生产时间的连续性,使白僵菌孢子粉产品合格率明显提高。 相似文献
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利用声波团聚的预处理原理,设计了一种针对汽车尾气中的悬浮颗粒物的过滤器处理装置。阐述了声波团聚与各可控因素间的关系,并提出利用声波、雾化水蒸气的联合作用,提高声波作用下的微尘颗粒团聚率。并利用已有的实验数据,预计这种基于声波团聚与预处理的车用尾气过滤器能够过滤汽车尾气中99%以上的PM10,以及50%以上的PM2.5,设计理念主要是将颗粒通过声波频率将颗粒直径增大,达到净化的目的。在该过滤器的广泛应用基础上,预测城市空气质量,尤其是基于可吸入颗粒的PM10、PM2.5值将会有质的改善,提高生活品质。 相似文献
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白液压力过滤器的使用及改进(150822)黑龙江省方正林业造纸厂鲁守权关艳白液压力过滤器是用于造纸碱回收车间苛化工段的新型设备,具有运行周期长、维护方便、占地面积小、白液固形物含量低、设备全封闭运行,及能改善车间操作环境和运行弹性大等优点。该设备自1... 相似文献
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与原有的滤清器不同,奔驰开发的这款滤清器将不使用燃料添加剂。
旧式滤清器虽然可以提高过滤器中颗粒的燃烧率,却无法处理残存在过滤器管道中的粒子状物质。久而久之,就会引起过滤器堵塞,导致发动机背压加大、二氧化碳产生量增加、发动机输出功率降低等诸多毛病。 相似文献
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针对受虫害的杨树叶片图像,分别采用均值滤波和中值滤波方法进行分析,最后通过MATLAB仿真,得出最佳的方法。 相似文献
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主要探讨了曝气生物滤池在低浓度进水条件时的调试策略,包括停止预处理预曝气系统运行,改造CN滤池曝气控制,调整滤池反冲洗周期等。结合调试期间的运行情况,对部分设备及工艺参数进行了改造优化,总结经验,为类似工艺的运行提供借鉴。 相似文献
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遥感图像会因成像系统和地理环境而产生噪音,这些噪音将会影响从TM图像中提取森林信息的精确性和有效性.消除噪音对图像的分类十分重要.本研究的目的是评估应用Landsat 5 TM 图像提取森林相关信息时,目前所使用的空间滤波处理方法的有效性.对低通滤波、中值滤波、均值滤波、求和滤波、增强型自适应滤波五种空间滤波方法做以检验.通过设计一系列的评估指数,分析每种噪音消除方法的平滑能力、边界保持和增强能力.基于所设计的评价指数和图片对比表明,对林区土地利用和森林类型分类而言,求和滤波(D=1)和增强型自适应滤波是消除Landsat 5 TM图像噪音的最有效的方法. 相似文献
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采用内生菌常规分离法从云南榧的新鲜茎与叶中分离得到10株内生真菌和5株内生放线菌,通过滤纸片扩散法研究了内生菌对小麦雪腐病菌、辣椒炭疽病菌、三七丝核病菌等10种植物病害病原真菌的抑菌活性。结果显示,云南榧内生真菌粗提物对10种植物病原真菌具有较广泛的抑制作用,其中,菌株TY3对棉花枯萎病菌具有较强的抑菌活性;菌株TY7对辣椒炭疽病菌、三七丝核病菌及番茄灰霉病菌具有较强的抑菌活性。5株内生放线菌中,菌株FTY1、 FTY5、 FTY7无抑菌活性,而菌株FTY2对10株植物病原真菌均表现出了较强的抑菌活性, FTY6对辣椒炭疽病菌、棉花枯萎病菌、梨黑星病菌表现出了很强抑菌活性。该实验结果为云南榧内生菌的进一步开发利用奠定了基础。 相似文献
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In boreal black-spruce forests of Eastern Canada, a cohort model of ecosystem management has been proposed whereby a combination of both partial and more intensive cutting are used to emulate old-growth stands and the re-establishment of stands following severe wildfire. As with other approaches to coarse filter conservation, partial cutting is hypothesized to maintain and potentially recreate plant and animal assemblages consistent with a range of natural variability. In this study, we used ground-dwelling spiders (Araneae) to evaluate whether partial cutting and a cohort model of ecosystem management are sufficient to preserve biodiversity found in mature and over-mature boreal black spruce stands prone to paludification. We compared the spider fauna (11,628 individuals representing 136 species) in replicated partial cuts, clear cuts and uncut control stands with a chronosequence of mature and over-mature naturally regenerated stands (94-288 years since the last fire) [25 stands in total] in the same region of the northern Clay belt in Québec (Canada). In stands that were old-growth prior to cutting, harvesting had strong repercussions on spider assemblages that were not attenuated by less intensive, partial cutting. The most obvious changes in spider assemblages were related to increased recruitment of species that were nearly absent in uncut stands. Several cosmopolitan species that were widely distributed among stands prior to harvest increased in cut stands. Spider assemblages collected following either cutting methods were not consistent with assemblages found within the chronosequence and thus fell outside the observed range of natural variability. However we did not observe a similar recruitment effect for spider species in younger stands with relatively higher levels of retention. We demonstrate that the interaction between stand age prior to cutting, the degree of paludification as well as remnant basal area are important considerations when evaluating the efficacy of partial cutting to maintain forest spider assemblages and biodiversity at large in black-spruce stands. “We also suggest that retention levels in partial cuts will have to be substantially increased to maintain spider communities within their range of natural variation in managed forested landscapes.” However partial cutting with higher levels of retention, particularly in younger stands, may be useful in coarse filter management particularly for establishing or accelerating spider assemblages towards those found in old-growth stands. 相似文献