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Search Results: 1 - 10 of 2457 matches for " 闻靓 "
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基于图像法的刨花板钻孔粉尘尺寸和形态分布研究
邢成,丁涛,李智,高意君,,张晨
- , 2018, DOI: 10.13360/j.issn.2096-1359.2018.01.004
Abstract: 排钻开孔是板式家具生产中的一个关键环节,但排钻设备多数没有固定吸气罩,加工过程中产生的木粉尘难以收集,由此带来显著的环境影响。笔者采用图像法对刨花板排钻开孔加工过程中产生的粉尘进行尺寸和形态分析,讨论了粒度、粒形参数对粉尘流动性的影响,为排钻粉尘的有效治理提供基础数据。试验表明,排钻粉尘颗粒的尺寸分布较广,但多数粉尘的粒径小于100 μm,属于总悬浮颗粒物范畴,它们在空气中停留的时间较长,传播距离也因此较远。横纵比、圆度和凸度分析表明,排钻粉尘的形态随尺寸变化而产生显著差异,大颗粒总体上形态较不规则,而小颗粒则较为规整。排钻粉尘在产生、排屑和传播过程中相互碰撞和磨蚀是形成这种形态分布特征的主要原因。在收集和输送过程中,大颗粒排钻粉尘因形态不规则而容易相互接触咬合,并在颗粒间形成较多孔隙,小颗粒的形态特征虽然有利于流动,但相互间易发生团聚,当其填充在大颗粒间的孔隙时,流动性受到进一步限制,因而总体上看排钻粉尘的流动性较差。
Panel drilling is a key operation in the manufacturing of particleboard furniture. The dust emitted from this process is hard to collect due to the absence of dust collecting hood in the machine, resulting in the increased environmental concerns. In this study, the size and shape distribution of dust emitted from particleboard drilling was investigated by image analysis, and their effect on dust flowability was discussed. We aimed at providing the efficient dust collecting with data supports. The results showed that the dust sizes emitted from the drilling process were widely distributed. But most ISO area diameters of the particles were below 100 μm, making them fall into the category of total suspended particulates(TSP). The TSP can stay longer in the air and travel in a wider space, which is considered harmful to human health. The distribution of the aspect ratio, roundness and convexity showed that the dust shape changed significantly with the size change. The bigger particles exhibited more irregularity, while the smaller ones presented more homogeneous shape. This pattern was established by the collision and erosion among the particles during their generation and removal from the cutter and transmission in the air. With respect to dust collecting and conveying, bigger particles tended to interlock with each other, making them hard to move and leaving many voids between them. The smaller particles were easy to agglomerate although their regular shape indicated a good flowability. Besides, when falling into the inter-particle voids, their flowability was further restricted by the surrounding walls. It was therefore concluded that the overall flowability of the dust emitted from particleboard drilling was poor
静滴头孢呋辛钠导致静脉炎1例
,杨婷
天津医药 , 2012,
Abstract:
甘草酸二铵注射液引起失语1例

天津医药 , 2012,
Abstract:
乙醇利用菌株的分离鉴定及在低醇苹果酒中的应用

- , 2015, DOI: 10.13982/j.mfst.1673-9078.2015.6.040
Abstract: 随着人们对自身健康的关注,低醇酒越来越受到人们的欢迎。为获得利用乙醇的菌株,利用YPD以及乙醇唯一碳源的培养基,经过多次分离与筛选,得到3株乙醇利用菌株SJ01、SJ02、SJ03,并对筛选菌株进行乙醇耐受特性的测定及乙醇利用曲线的绘制。同时,通过菌株菌落形态,细胞形态特征,结合26S rDNA 序列分析和系统发育树的构建,确定了3株分离菌的遗传学位置。结果表明:SJ01、SJ02、SJ03三株菌株的乙醇耐受浓度分别为10%、8%、9%。在唯一碳源培养基中培养20 d后,其乙醇利用率分别为39.9%、35.7%、31.8%。菌株SJ01和SJ02为Pichia kudriavzevii,菌株SJ03为Candida ethanolica。最后根据菌株能够利用乙醇作为唯一碳源生长的特性,将菌株SJ01和SJ03加入至苹果酒中进行低醇苹果酒的酿造,苹果酒的酒精度分别降低了17.5%和27.8%,且苹果酒品质得到了改善。
The popularity of low-alcohol ciders has risen owing to increasing health awareness. Here, yeast strains were repeatedly isolated and screened using culture media with yeast extract peptone dextrose (YPD) and ethanol as the sole carbon source, which resulted in the isolation of three ethanol-utilizing strains, SJ01, SJ02, and SJ03. The ethanol tolerance and ethanol-utilizing curve of the three strains were measured. In addition, the colony and cell morphology was observed, and the phylogenetic tree based on 26S rDNA sequence analysis was constructed to determine the genetic location of the isolates. The results showed that after incubation in media containing ethanol as the sole carbon source for 20 days, the ethanol utilization rates of SJ01, SJ02, and SJ03 were 39.9%, 35.7%, and 31.8%, respectively, while ethanol tolerance was 10%, 8%, and 9%, respectively. SJ01 and SJ02 were identified as Pichia kudriavzevii and SJ03 as Candida ethanolica. Finally, based on the growth characteristics of the strains with ethanol as sole carbon source, SJ01 and SJ03 were selected for the brewing of low-alcohol apple cider. The alcohol contents of apple cider were reduced by 17.5% and 27.8%, respectively, and the quality of the ciders was improved.
投资者正向反馈、承销商缺位与创业板IPO资金超募

财会月刊 , 2012,
Abstract: 本文以2009年10月至2011年9月在创业板上市的公司为样本,研究了IPO资金超募现象的影响因素。研究表明,在新股发行制度敞开市盈率和对创业板的普遍高预期背景下,投资者的正向反馈效应和承销商的缺位共同造成了创业板市场高企的IPO发行市盈率和资金巨额超募,承销商并未起到降低信息不对称的作用。基于此,本文提出提升市场信息披露效率和完善承销商声誉机制的建议。【关键词】正向反馈承销商缺位创业板IPO资金超募自2009年6月新股发行重启以来,资金超募现象就一直伴随着新股发行,特别是创业板的资金超募数额最为巨大。与创业板资金超募相伴而生的是高发行价和高发行市盈率,而这“三高”现象的背后,我们看到的是大量超募资金闲置、“高管离职潮”、“新股破发潮”和“业绩变脸潮”,不仅造成资源浪费,而且加剧了创业板的投资风险。众所周知,发行市场是由发行企业、承销商、询价机构和投资人共同构成的,承销商即使有提高发行价的动机但没有询价机构和网上申购者的追捧以及二级市场强烈购买欲望所造成的火热发行环境是难以成形的。因此,要考察资金超募问题的影响因素还应该从多角度入手。本文拟运用行为财务学中的正向反馈效应和投机主义行为来解释创业板IPO资金超募现象。
基于认知科学的技术设计分析

科技进步与对策 , 2006,
Abstract: 技术设计以普遍性为基础来理解人与世界的关系,将认识和实践的出发点定位于客观实在。它带有强烈的功利性,是人类特有的一种强烈的精神倾向性和主观能动性。技术设计的认知结构有认知知识、认知体验和认知监控3个要素。认知科学技术设计认知结构认知模式
论高校院系办公室管理的改善

科技进步与对策 , 2000,
Abstract: 就高校院系办公室人员如何正确处理与领导、与其他部门的关系以及正确处理人际关系的问题进行了阐述。高等学院院系办公室关系
环境知情权的法律与经济分析

科技导报 , 2010,
Abstract:
食品防腐剂丙酸钙中杂质元素的光谱分析

食品科学 , 2013,
Abstract: ?采用电感耦合等离子体发射光谱(icp-oes)法同时测定食品防腐剂丙酸钙中mg、al、ti、cr、mn、fe、ni、cu、zn、as、cd、pb共12种杂质元素。样品用5%硝酸稀释后直接进行测定,对分析谱线、基体效应和等离子体参数等进行分析,确定仪器的最佳工作条件。结果表明:该方法的相对标准偏差均在3.9%以下,通过加标回收实验,各元素的回收率为91.2%~110.6%,与传统分析方法相比较,该方法具有良好的准确度和精密度,能同时进行多元素测定等优点,可用于丙酸钙的质量控制和安全评价。
八极杆碰撞/反应池-icp-ms法测定食品稳定剂cmc-na中的重金属元素

食品科学 , 2013,
Abstract: ?采用微波消解-八极杆碰撞/反应池(ors)-电感耦合等离子体质谱仪(icp-ms)测定食品稳定剂羧甲基纤维素钠(cmc-na)中cr、mn、co、ni、cu、as、cd、sb、hg、pb十种重金属元素的含量。样品用硝酸-双氧水分解后,试液直接用icp-ms法进行测定。应用ors技术,有效消除多原子离子对待测元素的干扰,选用sc、y、in、bi等元素作内标混合液校正基体效应和信号漂移,确定实验的最佳测定条件。结果表明,该方法对10种待测元素的检出限在0.003~0.043μg/l之间,相对标准偏差均小于3.06%。该方法简便、快速、准确,可以用于食品稳定剂cmcna的质量控制和安全评价。
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