钢铁工业废渣制备玻璃陶瓷的研究

以CaO-Al2O3-SiO2系统为基础玻璃成分，钢铁工业废渣为主要原料，CaF2，Fe2O3，Cr2O3，ZrO2作为复合晶核剂，采用熔融法制备了钢铁工业矿渣玻璃陶瓷，运用DTA，XRD和SEM等测试方法对材料工艺制度和晶相进行了分析和观察，测定了材料的主要物理和化学性能，并对晶核剂的作用机理、材料性能以及工艺制度进行了分析和研究。实验表明：所制玻璃陶瓷的主晶相为普通辉石[Ca(Mg，Fe，Al)(Si，Al)2O6]和透辉石[CaMg(SiO3)2]，其化学稳定性较好，密度达到3.02g／cm^3，吸水率低于0.04％，抗弯强度达250MPa。     

MO对B2O3-Al2O3-SiO2系统玻璃析晶性能的影响

研究了添加BaO、CaO、MgO对B2O3-Al2O3-SiO2系统玻璃析晶性能的影响。用DSC测试了玻璃的析晶温度，用XRD分析了玻璃析晶后的晶相组成，用SEM观察了析出晶粒的形貌特征。结果表明：BaO、CaO均可有效促进BAS玻璃的形成，而MgO易导致玻璃分相。MO-BAS玻璃的析晶温度在770～810℃之间。添加BaO时析出的主晶相为硼酸铝（Al18B4O33）和少量勃来石（Al16B6Si2O37），以针柱状晶为主。用CaO替代BaO，析出的主晶相不变，但析晶能力增加，以细小的粒状晶为主。添加MgO时析出的主晶相为偏硼酸铝（Al4B2O9）和勃来石，晶粒较粗大。     

提高上海粘土强度的加筋试验研究

为解决因大孔隙与高压缩引起土的强度降低问题,采用棕榈加筋上海粘土来提高其强度。选择棕榈加筋率、加筋尺寸作为影响因素,对其进行直剪慢剪、CBR及无侧限抗压强度的试验研究。试验结果表明:棕榈加筋土能够显著提高上海粘土抗剪强度、抗压强度及抗变形能力。最适宜的棕榈加筋尺寸为6 mm×12 mm。直剪慢剪试验的最佳加筋率为0.6%,CBR及无侧限抗压强度试验的最佳加筋率为0.8%。同时通过试验研究,分析加筋土强度变化的原因,掌握棕榈加筋对上海粘土影响的变化规律。     

Concrete made from ceramic industry waste: Durability properties

Concrete which contains waste products as aggregate is called ‘Green’ concrete. Use of hazardous waste in concrete-making will lead to green environment and sustainable concrete technology and so such concrete can also be called as ‘Green’ concrete. Concrete made with ceramic electrical insulator waste as coarse aggregate shows good workability, compressive, tensile and flexural strengths and modulus of elasticity. Further, study of its durability will ensure greater reliability in its usage. Permeation characters are used widely to quantify durability properties of concrete. This paper presents an experimental investigation on the permeation characteristics [volume of voids and water absorption (ASTM C642-06), chloride penetration (ASTM C1202-10), and sorption] of concrete with ceramic electrical insulator waste coarse aggregate (hereafter it is called recycled aggregate concrete) of six different water–cement ratios in comparison with those of corresponding conventional concrete mixes. From the results it has been observed that there is no significant change in the basic trend of permeation characteristics of this recycled aggregate concrete when compared to the conventional concrete. This recycled aggregate concrete possesses higher permeation characteristic values than those of conventional concrete. These values decrease with decrease in water–cement ratio for both the recycled aggregate concrete and the conventional concrete.     

Vector Image Segmentation by Piecewise Continuous Approximation

In this article we present an approach to the segmentation problem by a piecewise approximation of the given image with continuous functions. Unlike the common approach of Mumford and Shah in our formulation of the problem the number of segments is a parameter, which can be estimated. The problem can be stated as: Compute the optimal segmentation with a fixed number of segments, then reduce the number of segments until the segmentation result fulfills a given suitability. This merging algorithm results in a multi-objective optimization, which is not only resolved by a linear combination of the contradicting error functions. To constrain the problem we use a finite dimensional vector space of functions in our approximation and we restrict the shape of the segments. Our approach results in a multi-objective optimization: On the one hand the number of segments is to be minimized, on the other hand the approximation error should also be kept minimal. The approach is sound theoretically and practically: We show that for L ²-images a Pareto-optimal solution exists and can be computed for the discretization of the image efficiently.     

Telseis Star采集站振动和冲撞引发的故障机理、维修与预防

Telseis Star无线遥测地震仪采集站故障率较高，检修中分析发现许多故障是由振动和冲撞引发的。我们对振动和冲撞引发的采集站故障机理进行了研究，论述了振动频率和最大振幅与重力加速度的关系，介绍了常见故障的判断、维修与预防方法。     

GLUT4 and transferrin receptor are differentially sorted along the endocytic pathway in CHO cells

The trafficking of GLUT4, a facilitative glucose transporter, is examined in transfected CHO cells. In previous work, we expressed GLUT4 in neuroendocrine cells and fibroblasts and found that it was targeted to a population of small vesicles slightly larger than synaptic vesicles (Herman, G.A, F. Bonzelius, A.M. Cieutat, and R.B. Kelly. 1994. Proc. Natl. Acad. Sci. USA. 91: 12750-12754.). In this study, we demonstrate that at 37 degrees C, GLUT4-containing small vesicles (GSVs) are detected after cell surface radiolabeling of GLUT4 whereas uptake of radioiodinated human transferrin does not show appreciable accumulation within these small vesicles. Immunofluorescence microscopy experiments show that at 37 degrees C, cell surface-labeled GLUT4 as well as transferrin is internalized into peripheral and perinuclear structures. At 15 degrees C, endocytosis of GLUT4 continues to occur at a slowed rate, but whereas fluorescently labeled GLUT4 is seen to accumulate within large peripheral endosomes, no perinuclear structures are labeled, and no radiolabeled GSVs are detectable. Shifting cells to 37 degrees C after accumulating labeled GLUT4 at 15 degrees C results in the reappearance of GLUT4 in perinuclear structures and GSV reformation. Cytosol acidification or treatment with hypertonic media containing sucrose prevents the exit of GLUT4 from peripheral endosomes as well as GSV formation, suggesting that coat proteins may be involved in the endocytic trafficking of GLUT4. In contrast, at 15 degrees C, transferrin continues to traffic to perinuclear structures and overall labels structures similar in distribution to those observed at 37 degrees C. Furthermore, treatment with hypertonic media has no apparent effect on transferrin trafficking from peripheral endosomes. Double-labeling experiments after the internalization of both transferrin and surface-labeled GLUT4 show that GLUT4 accumulates within peripheral compartments that exclude the transferrin receptor (TfR) at both 15 degrees and 37 degrees C. Thus, GLUT4 is sorted differently from the transferrin receptor as evidenced by the targeting of each protein to distinct early endosomal compartments and by the formation of GSVs. These results suggest that the sorting of GLUT4 from TfR may occur primarily at the level of the plasma membrane into distinct endosomes and that the organization of the endocytic system in CHO cells more closely resembles that of neuroendocrine cells than previously appreciated.     

NaF potentiates a K(+)-selective ion channel in G292 osteoblastic cells

In a previous study, isoelectrofocusing of serum from liver-diseased and healthy dogs revealed three different types of the acute phase protein, alpha-1-antitrypsin: Pi (protease inhibitor) F, Pi I and Pi S. Moreover, accumulated alpha-1-antitrypsin was found immunohistochemically in liver sections from dogs with chronic liver disease, predominantly in association with Pi I in serum. The present study was made to further the relationship between alpha-1-antitrypsin and the pathogenesis of chronic liver disease in dogs. Aliquots of samples of purified canine Pi F, Pi I and Pi S were examined for elastase inhibitory capacity, the main function of alpha-l-antitrypsin, and for polymerization tendency, a possible cause of accumulation of alpha-1-antitrypsin in the liver. These parameters were studied after incubation of the proteins at different temperatures (4, 37 and 42 degrees C) and pH values (6.8, 7.8 and 8.5) and for different periods (< or = 24 h and 5 days). In contrast to findings with Pi Z, the human alpha-1-antitrypsin variant associated with liver disease, polymers of canine Pi F, Pi I or Pi S could not be detected under any of the conditions tested. However, Pi I was sensitive to pH, as was demonstrated by reduced elastase inhibitory capacity after incubation at pH 6.8 for < or = 24 h or 5 days, or at pH 8.5 for 5 days. However, after incubation at pH 7.8 for < or = 24 h or 5 days at 4, 37 or 42 degrees C, Pi I was completely stable. Pi F retained its elastase inhibitory capacity, even after prolonged incubation, at all pH values and temperatures tested. Due to low yield, Pi S was tested only after incubation for < or = 24 h at pH 6.8 and at 4 degrees C; under these conditions its elastase inhibitory capacity was equal to that of Pi F. Taken together, these findings indicate molecular and functional differences between Pi I and Pi F and further support a role for alpha-1-antitrypsin in the pathogenesis of canine liver disease.