基于作业成本法的轮胎模具企业成本控制研究

根据现代模具制造的特征,分析了ABC法在模具企业内实施的可行性、必要性。结合模具制造过程。基于ABC法设置作业及作业中心,归集作业消耗的资源费用,确定成本动因、计算成本动因率,分配成本到各个相应作业,进而计算出产品成本,从而得到更为准确的产品成本,实现成本控制。     

Cu-Ni双金属催化剂的XPS研究

采用XPS方法研究了以不同方式引入Ni的Cu Ni/Al2 O3 双金属催化剂的表面结构及不同处理条件对催化剂表面结构的影响。发现催化剂表面存在表面铝酸盐物种 ,且Ni的存在会促进表面铝酸盐物种的生成。催化剂经H2 还原处理或经CO2 加氢反应后均要发生表面重构。Ni的存在会影响表面重构过程从而影响催化剂的活性和选择性 ,在所研究的含Ni催化剂上 ,CO2 加氢反应经历了生成双齿表面吸附中间物的过程。     

苯直接羟基化合成苯酚的研究进展

苯直接羟基化合成苯酚是有机合成中具有挑战性的课题之一,近年来对在固体催化剂的作用下,以H2O2、O2或N2O为绿色氧化剂,苯氧化羟基化的液相或气相反应研究均取得了不同程度的进展。3种氧化剂各有特点,其中N2O作氧化剂的气相反应,苯酚的收率和选择性均较高。     

毛竹的主要化学成分分析及热解

In recent years, great attention has been paid to the exploitation and use of biomass energy.Using bamboo as the raw material to produce energy and other chemicals is significantly important. A primary study was made on the pubescens, one kind of bamboo distributed broadly in China with fast growth rate. The contents of cellulose, hemi-cellulose, and lignin in different parts of pubescens with different growth ages, as major components of the cell wall, were determined. The analysis procedures were as follows, firstly the substances other than the above mentioned three were removed chemically,then the hydrolyzed cellulose liquid was oxidized with excess oxidants, and at last titrated. Pubescens powder was packed into the quartz tube reactor, then was heated from room temperature to 300, 350,400, 450, 500, 550℃ and 600℃ respectively in flowing N2. Pyrolysis was held at the final temperature for 10 h. The liquid products were analyzed with GC/MS. The main products in the liquid obtained were.acetic acid, 2,6-dimethoxy phenol, 2,3-dihydrobenzofuran, etc. The pyrolysis temperature exerted great effect on the composition of the liquid products. The distribution of the products could be regulated by controlling pyrolysis temperature.     

HY分子筛催化剂作用时机对毛竹热解的影响(英文)

A laboratory reactor was designed to test the effect of the interference instant of HY on the pyrolysis of pubescens. The time instant for intermediate species from pyrolysis to contact HY was controlled by varying the position of the catalyst bed relative to the pyrolytic cell. It was found that the effect of the interference instant was significant on the variation of different intermediate species, and the yield and quality of the products. The results also showed that, with the increase in the distance between the pyrolytic cell and the catalyst bed, the yield of liquid and relative content of the organics such as aldehyde, phenols, etc., decreased, while the yield of residue and relative content of acetic acid increased. The deoxygenation of the intermediate species was favored when the catalyst exerted its performance on them immediately after their formation.     

RuOx-PdO/Ti电极上活性氯的生成及甲基橙模拟废水降解研究

以钛基RuOx-PdO为阳极,钛网为阴极,Na2SO4和NaCl为支持电解质,研究了NaCl质量浓度、电流密度和pH对活性氯生成的影响及活性氯的生成与甲基橙模拟废水降解之间的关系.实验发现,以Na2SO4为支持电解质时,甲基橙模拟废水的有限降解是该阳极直接电催化氧化作用的结果.NaCl质量浓度和电流密度对活性氯的生成有明显的影响,酸性溶液中活性氯的生成量直接决定了甲基橙模拟废水的脱色程度,两者之间呈现较好的线性关系,碱性条件下不仅不利于活性氯的生成而且活性氯物种对甲基橙模拟废水的降解基本不起作用.     

含不同投放时间和重量的单熔炼炉批调度优化

单熔炼炉批调度中,熔炼批加工时间与批内任务需熔炼重量之和为单调递增函数关系。考虑不同任务投放时间和任务重量,建立了单熔炼炉最小化最大任务完工时间的优化模型。提出了基于任务序列的混合模拟退火算法(HSA)。HSA算法直接将任务分配到批,并通过BFF规则进行分批。仿真实验结果验证了HSA算法的有效性。     

面向大型生产车间的设备点检与巡检管理系统设计

为了解决大型生产车间的设备点检与巡检过程中点检巡检人员对任务的描述模糊不清、设备缺少个性化点检巡检服务和点检巡检信息难以得到有效利用等问题.利用"5W1H"方法、"ECRS"原则和信息化等技术对点检巡检流程进行了剖析,从传统流程优化、点检巡检策略个性化定制和信息高效利用3个角度设计了该设备点检与巡检管理系统.系统由Web端的管理系统和移动端的小程序共同组成,可优化现场点巡检任务执行的效率,提高设备点检巡检计划制定的科学性和企业设备管理水平,降低了后期设备维护成本和设备突发故障的几率,保证企业生产活动的高效和稳定.     

CO_2与CO在Ni／Al_2O_3催化剂上的吸附行为

对比研究了不同还原温度下ＣＯ２与ＣＯ在Ｎｉ／Ａｌ２Ｏ３催化剂上的吸附行为。结果表明，在５２３Ｋ、５７３Ｋ、６７３Ｋ和７２３Ｋ还原后形成的Ｎｉ物种均是良好的ＣＯ吸附中心，且随着还原温度的升高，ＣＯ吸附量增大。但当还原温度升高至７７３Ｋ时，催化剂对ＣＯ的吸附能力急剧下降。对ＣＯ２而言，仅当催化剂经５７３Ｋ还原时可获得良好的ＣＯ２活化吸附中心，７７３Ｋ还原时则与ＣＯ的吸附相似，催化剂几乎丧失对ＣＯ２的吸附能力。不同的还原温度，不仅造成催化剂上吸附中心数目的改变，同时催化剂上吸附中心的性质也要发生变化。对ＣＯ２的活化吸附需要与ＣＯ不同的吸附中心。