聚丙烯腈纤维接枝丙烯酰胺亲水改性的研究

采用化学接枝法以丙烯酰胺（AH）为接枝单体、过氧化苯甲酰（BP0）为引发剂、三烯丙基异三聚氰酸酯（TAIC）为交联剂、丙酮和去离子水为溶剂,对聚丙烯腈（PAN）纤维进行了接枝亲水改性。用傅立叶红外光谱仪（FTIR）和热重分析仪（TGA）等技术手段对接枝样品进行了表征,研究了原料配比和反应条件对导入率的影响。结果表明,PAN纤维上接枝了AH,适宜的溶液配比为AM0．8mol／L、BPO3×10^-3mol／L、TAIC 1v01％,在85℃恒温水浴中反应2h,可得到导入率为l27．9％的接枝纤维,接枝改性后的纤维亲水性得到提高,断裂强度和断裂伸长率均有下降,纤维分解温度和高温下的热稳定性得到提高。     

力学不均匀性对焊接接头拉伸性能的影响研究

为了研究焊接接头力学不均一性对单向拉伸性能的影响,本文采用数字散斑相关方法（DSCM）研究了纯铝激光-电弧复合焊焊接接头在拉伸过程中的局部变形行为,获得了母材、热影响区和焊缝区的应变分布情况,发现应力43.6MPa时熔合线附近的热影响区首先进入屈服阶段,并且随着荷载的增加,总应变迅速增大,热影响区真实应变远大于名义应变,并导致最终断裂。硬度测试结果显示热影响区出现明显的退火软化现象,硬度最低,使其成为焊接接头拉伸过程中最薄弱区域。基于能量法和硬度测试结果提出了纯铝焊接接头各区域屈服强度的预测模型,预测值与实验结果吻合良好。     

Introduction of＂ Ke＂ Series of Spring Wheat Vrieties

“十一五”期间,黑龙江省农业科学院克山分院小麦研究所,依据大兴安岭沿麓优质小麦产业带及黑龙江省不同生态地区的自然条件,选育出了具有代表性的强筋、中强筋品质类型新品种,即克丰11、克丰12、克丰13、克旱21、克春1号和克春2号,在黑龙江省麦区品种的更换中发挥了重要的作用。该文着重介绍上述6个新品种的农艺性状、品质特性、产量水平以及栽培要点和适宜种植区域,期望有助于全面了解、快速推广应用。     

Variety Comparative Test of Direct - seeding Rape in Wenzhou City

通过田间试验对直播条件下8个油菜品种的产量、生育期和农艺性状进行考察,结果表明：浙油19、浙大619、浙油50和浙油18产量水平高,机收适应性好,建议进一步加大在温州市的示范推广规模。     

HDPE与PPR全切痕拉伸断裂过程银纹性能测试

通过对高密度聚乙烯(HDPE)和无规共聚聚丙烯(PPR)进行不同拉伸速率的全切痕拉伸测试,考察了两种材料在近似于平面应变条件的拉伸断裂性能。对其全切痕拉伸过程应力-位移曲线、位移-屈服应力曲线分析:HDPE和PPR的屈服应力均随着拉伸速率的增加而增大;在较高拉伸速率时,HDPE全切痕拉伸断裂可认为是由常临界位移控制的银纹断裂,PPR的全切痕拉伸断裂过程几乎无恒定的常拉伸位移。通过显微镜显示的断裂形貌观察揭示了沿拉伸方向上HDPE有微纤空穴产生;在全切痕拉伸断裂过程中,PPR的银纹化易于发生在非晶区的片晶间,银纹微纤可产生在任意方向上。     

Exergy Identification Of Energy Utilization Efficiency In an Industrial Process of Ozone Generation

The main objective of the paper is to establish an arrangement of sources of exergy losses (internal and external ones) and to estimate the value of the losses in an industrial ozone production installation. An exergetic model of industrial installation in a system approach corresponding to real conditions has been formulated.     

坨首站直馏柴油非加氢改质工艺的技术研究

优选出坨首站直馏柴油的最佳非加氢精制工艺。根据坨首站原油之直馏柴油的理化性质,制备SD化学精制剂及SD01络合捕集剂,并采用此项非加氢技术对原料油进行精制。通过考查精制后柴油的主要理化性质,并进行储存实验,确定直馏柴油的最佳精制工艺。得到最佳工艺条件：加剂量为1︰300,在温度为20～50℃下搅拌反应10 min,在此精制条件下,直馏柴油各项理化性质可达到国家标准GB252-2000的要求。与加氢精制相比,此方法适用于没有加氢能力的中小型炼厂。     

Hydrodynamic dispersion of reactive solute in a Hagen-Poiseuille flow of a layered liquid

An analysis of the solute dispersion in the liquid flowing through a pipe by means of Aris-Barton's ⒈method of moments',under the joint effect of some finite yield stress and irreversible absorption into the wall is presented in this paper.The liquid is considered as a three-layer liquid where the center region is Casson liquid surrounded by Newtonian liquid layer.A significant change from previous modelling exercises in the study of hydrodynamic dispersion,different molecular diffusivity has been considered for the different region yet to be constant.For all time period,finite difference implicit scheme has been adopted to solve the integral moment equation arising from the unsteady convective diffusion equation.The purpose of the study is to find the dependency of solute transport coefficients on absorption parameter,yield stress,viscosity ratio,peripheral layer variation and in addition with various diffusivity coefficients in different liquid layers.This kind of study may be useful for understanding the dispersion process in the blood flow analysis.     

Tailoring the Texture and Mechanical Anisotropy of Multi-cross Rolled Mg-Zn-Gd Alloy by Annealing

The unidirectional rolled Mg-Zn-Gd sheet usually exhibited non-basal texture with two peaks whose tilting angle were about 42° from normal direction to transverse direction (TD), which would cause the mechanical anisotropy. In this study, multi-cross rolling followed by annealing was used to tailor the texture and mechanical anisotropy for Mg-Zn-Gd alloy. With increasing annealing temperature, the rolled basal texture with two peaks gradually transformed into the circle texture with multi-peaks. In order to figure out different texture components evolution during annealing, the basal texture, R-texture and T-texture component were defined and studied. The results showed that the change of R-texture and T-texture component was asynchronous with increasing annealing temperature from 250 to 400 °C. The tilting angle of R-texture component increased slightly, while the tilting angle of T-texture component increased obviously, and this phenomenon was attributed to the preferential nucleation at grain nucleation stage rather than preferential grain growth. The yield strength along TD was more sensitive to annealing temperature compared with that along rolling direction (RD), resulting in different descending slopes and yield strength anisotropy with increasing annealing temperature. Annealing at 300 °C was the best annealing temperature due to low yield strength anisotropy, moderate strength and good elongation among these annealing temperatures. The Schmid factor for basal slip indicated that the activity of basal slip along RD increased slightly, while that along TD increased obviously with increasing annealing temperature from 250 to 400 °C, which should be caused by the asynchronous change of R-texture component and T-texture component, consequently resulting in the transformation from isotropic yield strength to anisotropic yield strength.     

试制X80输油气管线钢的包申格效应研究

研究某厂试生产的X80输油气管线钢的显微组织结构和常规力学性能。该钢板以针状铁素体组织为主 ,晶粒 12级。采用四点弯曲方法 ,模拟制管工艺进行钢板的包申格效应研究。在屈服变形阶段 ,随预变形量的增加 ,由包申格效应导致的屈服强度损失单调的增加 ,此现象与屈服过程中 ,钉扎位错的脱钉 ,形成大量有方向性的可动位错有关。按API标准 ,从试制的 610mm× 7.9mm螺旋钢管取样进行测试 ,结果发现钢管由包申格效应导致的屈服强度损失 ,除卷板头部和尾部略高外 ,沿板长平均在 5 5MPa至 75MPa之间。包申格效应的影响不可忽视