改扩建项目经济评价浅议

本文论述了改扩建项目经济评价中的盈利能力和清偿能力分析。     

石油焦作为粉煤气化原料的可行性分析

为了验证石油焦作为粉煤气化原料的可行性,对其基本性质、疏水性、挥发性和流动性进行了分析,并与3种典型的煤进行了对比。结果表明:石油焦性质与晋城无烟煤最为相近,具有热量高、含碳质量分数高的特点;石油焦中主要包含芳香烃、烷烃、双键烃基等疏水基团,不易与水互溶;石油焦粉在制粉干燥过程中无挥发性有机物析出,不易吸湿结团,能够满足粉煤气化制粉单元的需求;石油焦粉的流动性优于煤粉,在加压输送单元不易发生架桥现象。     

Financial risk and resiliency on US dairy farms: Measures,thresholds, and management implications

Given the revenue and cost volatility with resulting tight profit margins in dairy farming, it is increasingly important to measure, monitor, and understand farm financial risk. Solvency, liquidity, debt repayment capacity, and financial efficiency measures can reveal potential problem areas and assist in financial risk management. Financial risk is defined as uncertainty about interest rates, willingness of lender to keep or put money into the business, ability to meet cash flow needs, and the market value of collateral. Financial resilience is defined as the ability to withstand events that impact firm net income. Solvency was measured by equity to asset ratio. Liquidity was measured by current ratio. Repayment capacity was measured by debt coverage ratio. Financial efficiency was measured by operational expense ratio and net farm income ratio. Critical thresholds for these farm financial measures include those determined by US agricultural lenders since maintaining access to outside capital is important for farm financial management. To demonstrate these concepts and measure financial risk and resilience, this research uses farm data from a balanced panel of 105 New York dairy farms from 2010 through 2019. Results reveal that there were 4 average, 2 good, and 4 poor financial years for these operations on average as measured by farm profitability. Solvency positions were relatively stable being based on long-term asset and liability values. During the poor years, the percent of farms below danger thresholds for liquidity and debt repayment capacity spiked.     

我国A-H股溢价的问题研究

在证券市场上,由市场分割引起的同股同权不同价的现象是当代金融的重要问题之一。在我国市场上,A股和H股之间亦存在着溢价现象。信息不对称、流动性差异、需求差异和风险差异是影响我国A-H股溢价的主要因素。本文选取同在A股和H股上市的5家公司为代表,检验4个影响因素在2007年初至2012年底对我国A-H股溢价的影响。经过实证检验得出,信息不对称和需求差异对我国A-H溢价有影响,而流动性差异与风险差异则无显著影响。     

加工泵体车胎的设计与分析

以加工采煤机上的泵体孔车胎为例 ,简述了各机构的设计过程及机构分析。从理论上详细论述了液性塑料弹性定心夹紧机构中薄壁套筒的受力、变形情况。     

安钢150t钢包管理与生产实践

安钢第二炼轧厂150t钢包烘烤质量、周转状况、底吹合格率和钢包自开率等关键指标对保障整个炼钢区生产顺行有着极其重要的作用。为此从不同方面展开关于钢包的使用管理研究,采取多种有效措施,基本保证了钢包红包周转,钢包自开率提高到98．3％以上,底吹合格率提高到99．8％以上,有效的保障了炼钢区的生产顺行。     

聚甲醛的注塑成型加工工艺及特性研究

主要阐述工程塑料聚甲醛的基本结构,通过其注塑成型,并分析其工艺特点来进一步改善加工工艺。     

PE80级聚乙烯管材的工业试生产

讨论了PE80级聚乙烯管材HD3902EX生产过程中存在的熔体流动指数偏低、粒料和粉料的熔体流动指数偏差大及预聚物流动性差等问题。根据熔体流动指数和催化剂活化温度及聚合反应温度的关系,并参照典型密度下聚合物的初熔点,将催化剂活化温度及聚合反应温度分别升至670~720℃和99~101℃,聚合物的熔体流动指数明显改善。分析了粉料经挤压造粒后熔体流动指数降低的原因,调整挤压机螺杆转速后,粉料和粒料的熔体流动指数偏差减小。将每批催化剂投料量减少10%~20%,每批预聚合的乙烯量不变,预聚物收率增大10%~20%,降低了预聚物中的细粉含量。通过合理选择催化剂活化温度,使预聚物活性不变。经过调整优化操作参数,产品各项指标达到要求。     

铝合金铸造中影响薄壁流动性的因素分析

铝合金铸造工艺在很多领域得到较好应用,为航天制造、汽车制造等提供了新的发展方向。铝合金铸造中最重要的问题就是解决薄壁流动性的影响因素问题,将从铝合金铸造当中对薄壁产生影响的因素以及填充条件对薄壁流动性产生影响的因素等方面着手,对铝合金铸造中影响薄壁流动性的因素进行了分析。     

开放式证券投资基金流动性风险预测和控制的一种方法

投资者的流动性是影响开放式证券投资基金业绩的重要因素，流动性风险也是开放式基金管理过程中的主要风险之一．本文通过对投资者的随机流动性分析，利用停时和鞅的定义及性质给出了一个预测和控制开放式证券投资基金流动性风险的方法，为开放式基金管理者提供了一个决策依据．