基于CAPE-OPEN标准的复杂吸收塔单元模块开发

吸收过程的模拟计算在化工流程模拟中具有重要地位。单独一种算法很难适用不同类型吸收过程的计算,因此,开发能计算不同类型吸收过程的复杂吸收塔单元模块具有重要意义。基于CAPE-OPEN标准,对复杂吸收塔单元模块进行开发,首先明确复杂吸收塔的功能,根据流量加和法、新松弛流量加和法建立数学模型及求解算法;其次,采用C++语言,通过COM组件技术开发吸收塔单元模块;最后,分别通过非极性体系和极性体系两个吸收实例对所开发单元模块进行测试。将计算出的各塔板温度、汽液相流量、组成与Aspen Plus计算结果进行对比,结果表明,除个别含量很小的组分组成相对误差较大外,其余各塔板温度、汽液相流量、组成相对误差均在0.3%以内,表明该单元模块计算结果准确可靠,对于吸收过程的模拟与优化具有重要的实际意义。

畜禽企业组织复杂性与绩效关系研究

组织复杂性是影响企业绩效的重要因素,规避还是发展、吸收还是还原组织复杂性,是当前新型农业经营组织成为理论和实践热点背景下,业界不可回避的理论和现实问题。以畜禽业企业为研究对象,基于结构、关系、行为三个维度,对农业组织复杂性全面深入阐述的基础上,回归分析组织复杂性与组织绩效间关系。研究结果显示,农业企业组织复杂性与组织绩效间呈显著正相关,农业企业面临的环境复杂性超过企业组织复杂性,农业企业可通过还原组织复杂性提升组织业绩。研究表明,国有单一股权结构和多元化程度较高的企业绩效显著低于混合所有制和非多元化企业组织绩效。为我国农业企业复杂性选择、治理结构及多元化等问题研究提供理论依据。

Analysis of complicated structure seismic wave fields

In western China seismic wave fields are very complicated and have low signal to noise ratio.In this paper,we focus on complex wave field research by forward modeling and indicate that density should not be ignored in wave field simulation if the subsurface physical properties are quite different.We use the acoustic wave equation with density in the staggered finite-difference method to simulate the wave fields.For this purpose a complicated geologic structural model with rugged surfaces,near-surface low-velocity layers,and high-velocity outcropping layers was designed.Based on the instantaneous wave field distribution,we analyzed the mechanism forming complex wave fields.The influence of low velocity layers on the wave field is very strong.A strong waveguide occurs between the top and base of a low velocity layer,producing multiples which penetrate into the earth and form strong complex wave fields in addition to reflections from subsurface interfaces.For verifying the correctness of the simulated wave fields,prestack depth migration was performed using different algorithms from the forward modeling.The structure revealed by the stacked migration profile is same as the known structure.