STUDY ON THE SYNTHESIS AND APPLICATION OF SELFFIXED SIZING AGENT

INTRODUCTIONThe conversion from acid to neutral papermaking will bring about great economic and environmental benefit. A new kind of neutral sizing agent with fine quality and low price can accelerate the conversation.WSF-Sizing Agent is a new kind of waterproof agent especially for paper tableware. It is a high polymer waterproof material coming from the polymerization of methyl methacrylate, propenyl nitrile and cation monomer. The uses of technology focus on the emulsion polymerizati…     

Makisterone A and 24-methylenecholesterol from the ovaries of the honey bee,Apis mellifera L

Summary Makisterone A, a 28-carbon ecdysteroid (molting hormone) has been isolated from the ovaries of queen bees. Analysis by reversed-phase and silica high performance liquid chromatography (HPLC) in conjunction with a radioimmune assay (RIA) revealed about 11 ng of makisterone A present per gram of ovaries on a fresh weight basis. No C₂₇ ecdysteroids were detected. The predominant neutral sterol present was 24-methylenecholesterol.     

单机多道次异步连轧力参数计算

本文提出了单机多道次异步连轧机各道次间前、后张力ｑ＿ｈ、ｑ＿Ｈ的关系式和计算各道次在全异步轧制（ＰＶ轧制）、不完全异步轧制（ＩＰＶ轧制）或普通轧制（Ｎｏｒｍａｌ轧制）时单位压力、轧制力、中性面高的方法，并以汤氏３５０单机三道次异步连轧机为例，用计算机辅助设计的方法计算了其各道次的力参数．计算结果说明：轧制力在ＰＶ轧制时最小，在Ｎｏｒｍａｌ轧制时最大．     

基于随机森林与时空聚类的共享单车站点需求量预测

为方便准确地预测出城市共享单车站点的需求量,根据站点需求量的随机性和时变性,提出了一种基于随机森林和时空聚类的共享单车站点需求量预测模型;该模型研究了时间因子、气象因子以及关联站点对需求量的影响;应用分层聚类对站点进行了时空分析;结合对数优化后的随机森林作为预测器。面向湾区共享单车出行数据进行需求量预测。结果表明:该模型相比极限学习机、支持向量机与随机森林等经典机器学习算法在需求量预测方面有较好的预测结果,可为实际车辆调度提供参考依据。     

预应力混凝土梁疲劳挠度计算的神经网络模型

在分析多种疲劳损伤累积准则的基础之上,针对混凝土材料疲劳损伤发展受多种因素影响,损伤累积过程表现出非线性,难以用较准确的数学函数模型对其进行描述和分析的问题,建立了基于神经网络的预应力混凝土梁疲劳挠度计算的仿真模型,提出了3种仿真模拟方法,并在结合预应力混凝土梁疲劳实验结果分析的基础上,分析了各方法的精度、优势和适用范围.结果表明,3种仿真模型误差范围在5%~15%之间,可用于预应力混凝土桥梁结构抗疲劳设计及疲劳耐久性评估.建议根据不同情况需求选取合理高效的仿真模拟方法.     

时间测度链上二阶非线性动力方程的振动准则

研究了时间测度链上的一类具有非线性中立项的二阶非线性变时滞动力方程的振动性,利用时间测度链上的理论,结合Riccati变换和一些不等式技巧,得到了该方程振动的几个新的充分条件,其结果不仅推广和改进了现有文献中的某些已知结果,而且在时间测度链上统一了具有非线性中立项的二阶变时滞微分方程和差分方程的振动性质.     

1995~2010年中国钢铁工业能源消耗影响因素分析

基于1995~2010年中国钢铁工业能源消耗及钢产量数据,采用对数平均迪氏分解法对中国钢铁工业能源消耗进行因素分解,包括能源消费结构、吨钢能耗和钢产量.结果显示,1995~2010年中国钢铁工业能源消耗总体上升了3596700tce,其中钢产量变化对其影响作用最大,贡献率为15750%,吨钢能耗的影响次之,为-5753%,能源消费结构对其影响作用最小,仅为003%.降低吨钢能耗是降低钢铁工业能源消耗的关键措施,2010年吨钢能耗较1995年降低40435kgce/t钢,其中钢比系数贡献率为2937%,工序能耗贡献率高达7063%.     

高阶非线性时滞中立型微分方程解的渐近性态

本文研究一类高阶非线性时滞中立型微分方程的解的渐近性态,给出了该方程的解是振动的,或者趋于零,或者趋于无穷的条件.并推广了J.R.Graef等的工作.     

Induction of apoptosis and CD10/neutral endopeptidase expression by jaspamide in HL-60 line cells

Jaspamide (jasplakinolide) is a natural peptide isolated from marine sponges of Jaspis species and has fungicidal and growth-inhibiting activities. We characterized the jasplakinolide-induced loss of viability by programmed cell death in the HL-60 human promyelocytic leukemia cell line and found that this process was accompanied by neutral endopeptidase (NEP)/CD10 expression on the surface of the apoptotic cells. HL-60 cells do not normally express detectable amounts of NEP/CD10 on their surface or intracytoplasmically, but upon jaspamide treatment, CD10 was synthesized de novo, its expression being inhibited by cycloheximide pretreatment. Once synthesized, NEP/CD10 interfered with the jasplakinolide signal delivered to HL-60 cells. Inhibition of NEP/CD10 by the NEP inhibitor phosphoramidon or by an anti-CD10 monoclonal antibody significantly increased apoptosis induction. The appearance of CD10 on the cell surface was blocked by preincubation of the cells with the monocytic/macrophage-differentiating agents vitamin D3 and phorbol 12-myristate 13-acetate, but not by the granulocytic differentiating agents retinoic acid or dimethyl sulfoxide. Moreover, in the promonocytic U937 and mature monocytic THP-1 cell lines, jaspamide induced apoptosis but not CD10 expression. In HL-60 cells, CD10 expression was partially but not totally blocked by the broad-spectrum caspase inhibitor benzyloxacarbonyl-Val-Ala-Asp-fluoromethylketone, indicating a connection between apoptosis induction and CD10 synthesis. Our findings suggest that the CD10 expression is related to the programmed cell death induction by jaspamide, and also with the process of granulocytic differentiation in HL-60 cells. Received 22 April 2002; received after revision 8 June 2002; accepted 10 June 2002     

图像识别的一个综合网络模型及其应用

综合集成技术是为解决开放的复杂巨系统问题而提出的一种方法论，强调开放的系统观和人－机集成的重要性。提出一个多层的带有反馈信息的综合网络模型，在染色体图像识别中使用该模型，达到较好的识别效果。