共查询到19条相似文献,搜索用时 140 毫秒
1.
材料多因素对24mm滤嘴长卷烟烟气递送量及过滤效率的影响 总被引:1,自引:0,他引:1
采用正交试验设计的方法研究24mm滤嘴长卷烟之卷烟纸、成型纸、接装纸及嘴棒组合搭配对卷烟焦油量、烟气烟碱量、烟气一氧化碳量、烟气水分及过滤效率的影响.结果表明:接装纸透气度、嘴棒吸阻分别是影响卷烟烟气递送量、过滤效率的显著因素及重要因素.重点对其进行调整和控制,可以很好地实现24mm滤嘴长卷烟烟气递送量及过滤效率的控制,减少产品质量波动,降低产品成本.使用该方法可快捷、高效、经济、准确地确定卷烟材料多因素对卷烟烟气递送量及过滤效率的影响规律. 相似文献
2.
为筛选用于考察外源添加剂对卷烟常规烟气指标影响的样品制备关键控制因子,采用L_8(2~7)正交试验设计进行香兰素及乙基麦芽酚的添加实验.卷烟常规烟气指标变化数值通过极差分析、方差分析,结果显示:参比卷烟种类是影响卷烟烟气总粒相物、焦油、水分的高度显著因子,就试验采用的1R5F和3R4F参比卷烟而言,添加剂在高焦油3R4F卷烟中对常规烟气指标的影响比其在低焦油1R5F卷烟中的影响大;添加剂种类与浓度的交互作用不仅对卷烟烟气总粒相物有高度显著影响,而且对总粒相物中的水分也有显著影响;因此,规范样品制备,可减少误差、保证后续外源添加剂加入对卷烟常规烟气指标影响评价结果和推断的可靠性及科学性. 相似文献
3.
通过水稳定性试验,采用二次回归正交设计建立多因素交互作用下土凝岩改良粉质粘土水稳系数的简化预报模型,并对各敏感因素进行逐步回归分析,明确影响土凝岩改良粉质粘土水稳定性敏感因素的量化指标.基于试验条件,结果表明:影响土凝岩改良粉质粘土水稳定性的因素权重依次为压实度0.414、掺量与压实度交互作用0.342、掺量0.147、养护龄期0.034;土凝岩掺量和压实度的交互作用较为明显,实际工程中应综合考虑固化剂掺量和压实度的影响;养护龄期对水稳定性影响较小,因此应重点做好路基前期养护工作;建立了土凝岩改良粉质粘土水稳系数的简化预报模型,并通过与实测值进行对比验证了模型的准确性,为固化剂改良土水稳定性的研究提供了一种简洁的方法. 相似文献
4.
沙市荆轮饮料厂86年4月建厂投产时,橙汁汽水是市场上最受欢迎的饮料之一.据报道,它的销量占其它饮料的70%以上.在既无经验、又无资料的情况下,如何尽快设计出该产品配方,向市场推出俏销的合格产品,就成为迫在眉睫的事情.由于橙汁汽水是由多种原料组合而成,所以影响汽水成品的因素是多因素的,而考核汽水的合格又是多指标的.在时间紧、任务急的情况下,怎样找到多因素的合理搭配,来提高汽水风味.(本文只着重讨论精度、酸度两个指标)当然成本愈低愈好. 我们用正交表LS(2 7)作了六因素两位级[1]的八次试验,其因素、位级、试验计划及试验结果见表… 相似文献
5.
6.
发展了一种适用于二元翼型试验洞壁干扰特性的评估和修正方法.基于Prandtl-Glauert速度势方程和布置在模型及洞壁表面的线性涡,采用迭代方法计算了风洞孔壁对翼型表面压力分布特性的影响,分析了不同孔壁透气特性参数的影响规律和量值,利用与国外参考结果及风洞试验结果的对比确定了该方法的准确性.结果表明,孔壁对翼型绕流的影响主要反映在上翼面吸力峰和最大厚度位置之间,使压力系数减小,积分后的升力系数降低,且随着孔壁透气特性参数的增大,洞壁干扰由实壁特性向开口特性发展,洞壁干扰、影响量急剧增大.与传统方法相比,该方法计算快速,结果可靠,同时具备试验前评估的能力,可用于亚临界范围内翼型表面压力的快速估算,以及翼型试验的洞壁干扰修正. 相似文献
7.
8.
通过运用四阶段DEA的方法,首先分析环境变量对各地区技术效率的影响,并得到过滤掉环境因素影响的技术效率;再运用Bootstrap技术,得到各地区纠偏后的技术效率.结果分析表明:可节约劳动的调整对东中部地区效率变动产生较大的影响,资本调整仅起次要作用;可节约资本与劳动的调整对西部地区效率变动都产生重要影响.环境变量的作用表现为:民营资本、基础设施、产业升级、FDI等因素对提升地区技术效率起重要作用. 相似文献
9.
《数学的实践与认识》2017,(21)
随着航班起降架次的不断增长,许多大中型机场在高峰小时出现了不同程度的拥堵,机坪俨然成为继空域和跑道之后又一个制约机场容量、降低机场地面运行效率的瓶颈.通过问卷调查方法对机坪容量的影响因素进行统计分析,运用集成的DEMATEL-ISM方法对各因素的重要程度进行定量化计算.为得到科学合理、层次简明的解释结构模型,引入阈值入,将整体影响矩阵简化为邻接矩阵,进而确定影响因素之间的联系及层次关系,找出影响机坪容量的关键因素,最后结合中心度和原因度的计算结果对各影响因素的重要程度进行验证分析.机坪容量影响因素分析为机场规划设计、机场运行管理人员合理确定机坪容量、提高机坪使用效率提供科学决策的依据. 相似文献
10.
金属泡沫材料的压缩响应是微结构相关的,低无序时以单一塌缩带的形核和扩展为主,高无序度时,主要是扩展能力很弱的弥散塌缩带形核所控制。基于考虑材料微结构Weibull分布的应变梯度塑性模型,探究了胞孔塑性屈曲时,相对强度改变和相对密度改变对变形模式转捩的影响。研究发现:当相对密度改变量为定值时,随相对强度改变量的增大,变形模式的转变在较低的无序度下发生。而强度改变量为定值时,相对密度改变量的变化对多孔材料压缩变形模式转变的临界无序度无确定的影响规律,但变形模式转捩点的应力水平随相对密度改变量的减小而下降。 相似文献
11.
12.
13.
Many of the current generation of high speed manufacturing machines are fitted with detection systems to monitor the quality of every item produced. Loose end fault and paper damage are two major defects in cigarette manufacturing. It is known that the proportion of defects is related to the cigarette tobacco content. These defects are monitored by a screening variable (tobacco weight) at the making machine and are inspected by an optical device at the packing machine. We investigate the optimal production plan (mean input tobacco weight) and the quality control design (control limits) of a maker-packer production system. The inspection error is considered in the analysis. 相似文献
14.
A three-dimensional (3D) model based on the first principles of mass, momentum and energy was developed that numerically simulates the processes of static and forward smoldering in a porous packed bed of plant materials. The packed bed contains cellulose material or tobacco (cigarette) wrapped in a porous paper and surrounded by an ambient air. Other major characteristics of the model are including the effects of buoyancy forces in the flow field, separate treatment of solid and gas in a thermally non-equilibrium environment, and use of multi-precursor kinetic models for the pyrolysis of staring material and oxidation of char. The changes in porosity due to pyrolysis and char oxidation and the effect of porosity on the bed permeability and gas diffusivity are included. The mass, momentum, energy, and species transport equations are solved in a discretized computational domain using a commercially available computational fluid dynamics (CFD) code. The simulation results show that the model reasonably reproduces the major features of a burning cigarette during smoldering and puffing and are in a good agreement with the existing experimental results for cigarettes. Results include the velocity profiles, gas and solid temperatures, coal shape, burn rates, profile and transport of gas and vapor species throughout the packed bed, dilution through the wrapper paper and ventilation in the filter section, and the mass fraction of some pyrolysis and oxidation products in the mainstream and sidestream flows. 相似文献
15.
Brian Straughan 《Mathematical Methods in the Applied Sciences》2019,42(6):2098-2108
A model is presented involving non‐smokers, tobacco cigarette smokers, and those who smoke electronic cigarettes. The transfer from the tobacco smoker class to the e‐cigarette class is via a peer pressure term. It is shown that there are three distinct equilibria. One involves no smokers of any kind. A second has only non‐smokers and smokers of tobacco cigarettes. The third has a steady state with all three categories. Conditions are derived under which each equilibrium state will be stable. Numerical simulations are given that show the convergence to steady state for the third equilibrium. Simulations are also performed for a more general model where the peer pressure term in the tobacco to e‐cigarette transition involves also a conformity bias. 相似文献
16.
Using a modified Lanchester model, this article demonstrates that the policy of constant advertising spending is superior to a cyclic counterpart, provided that the advertising response functions of competing firms are concave. The competitive model is estimated using filter and non-filter cigarette data. The empirical results suggest the presence of over-advertising and that the relative effectiveness and elasticity of filter cigarette advertising are both higher than those of non-filter cigarette advertising. 相似文献
17.
运用粗糙集属性约简算法对初始因素指标进行约简,运用熵值法确定指标权重并建立综合评价模型,对贵州省各地区卷烟消费市场潜力进行综合评价,得出各地区消费潜力排序.应用实例表明两种方法结合使用将有效提高评价质量. 相似文献
18.
针对卷烟企业生产中的批量计划和柔性流水车间调度集成问题,构建了整数规划模型,目标函数由卷烟生产时间、生产线调整次数、卷烟质量、库存成本四部分组成。鉴于该问题的NP-hard性,设计遗传算法进行求解,通过合理设计遗传算子,避免不可行解出现。应用某卷烟企业数据得到优化排产结果,与该企业之前依照经验排产方案进行对比,发现优化排程结果在减少品牌转换次数,提高生产的连续性方面具有明显优势。该算法已作为某卷烟企业排产人员的排产参考,应用于排产决策中,取得了良好的效果,对卷烟企业制定排产计划具有一定的实际指导意义。 相似文献
19.
We study a maker-packer production system in cigarette manufacturing where two different types of detectors are installed on the making and packing machines to maintain the product quality. The making machine detector has a continuously adjustable setting which determines the proportion of defective cigarettes removed. The packing machine detector has only discrete settings. We develop an economic model to derive the optimal settings for these detectors to achieve a specified average outgoing quality. The proposed maker-packer model is useful in other industries. 相似文献