Differential Scanning Calorimetry of Fish Muscle: The Effect of Processing and Species Variation

Differential Scanning Calorimetry (DSC) has been used to study the thermal properties of fish muscle proteins and to measure the extent of their denaturation under various processing conditions. Fish myosin was susceptible to denaturation by frozen storage and dehydration. Denaturation of certain fish proteins was partially reversible. Although fish myosin was very unstable, its thermal stability was found to increase in species adapted, to higher environmental temperatures.     

Evaluation of epoxy underfill materials for solder flip-chip technology

Abstracts are not published in this journal This revised version was published online in November 2006 with corrections to the Cover Date.     

EARLY-STAGE EVOLUTION OF PARTICLE SIZE DISTRIBUTION DUE TO GRAVITATIONAL COAGULATION

ABSTRACT

Evolution of the particle size distribution of an aerosol undergoing gravitational coagulation in early time stages was numerically investigated. The moment method was also applied in initiating a simple approach to the changes of particle size distribution parameters. Finally, an analytical solution was developed approximating the collision kernel into a form suitable for the analysis. The results underwent analysis by comparison. The derived analytical solution was found to be in good agreement with the numerical moment method. However, the results of the moment method do not exactly coincide with the results of the direct numerical integration because the particle size distribution does not attain the log-normal size distribution form.     

Bi_(0.5)Na_(0.5)TiO_3-SrZrO_3无铅陶瓷的铁电和压电性能(英文)

采用固相反应法制备Bi0.5Na0.5TiO3-SrZrO3(BNT-SZ100x,x=0-0.15)无铅陶瓷,通过XRD、SEM和电致应变等手段对其进行表征。XRD分析表明样品的第二相为纯钙钛矿型。铁电致应变曲线表明:当SZ添加到BNT陶瓷中,铁电顺序被破坏。当添加5%(摩尔分数)SZ时,剩余极化强度和压电常数的最大值分别为32μC/cm2和102 pC/N。BNT-SZ9样品的电致应变(Smax)和归一化应变(Smax/Emax=d*33)的最大值分别为0.24%和340 pm/V。     

Strategies to suppress grain growth of nanocrystalline aluminum

The grain growth behaviors of nanocrystalline aluminum, alloy and composite are compared. First, nanocrystalline aluminum is fabricated by consolidation of ball-milled powder. Second, nanocrystalline aluminum alloy is designed to have elements such as Mn, Zr, and Misch metals, which can form thermally stable second phases at grain boundaries and also drag the movement of grain boundaries. Third, nanocrystalline aluminum-based composites containing multi-walled carbon nanotubes (MWCNTs) are also prepared because MWCNTs are expected to be located at grain boundaries and to suppress the grain growth of nanocrystalline aluminum. These three types of samples are annealed at 550 °C for up to 5 d and the effect of annealing time on Vickers hardness of the samples is compared. As a result, MWCNTs are found to be most effective to impede grain growth of nanocrystalline aluminum.     

DIFFUSIONAL MODEL WITH AND WITHOUT SHRINKAGE DURING SALTED FISH MUSCLE DRYING

Abstract

The drying process of salted pieces of shark muscle (Carckarhinus limbatus) was accomplished using three air conditions (20 ^°C -40 %RH; 30 ^°C - 30 %RH; 40 ^°C - 45 %RH) and two air velocities (0.5 m/s; 3.0 m/s). Shrinkage of material during drying was correlated as a linear function between linear dimension and moisture content. The experimental drying data were obtained using both the diffusional model with moisture content parameter (considering no shrinkage) and the diffusional model with moisture concentration parameter (considering shrinkage). The values of effective diffusivity varied between 1.50×l0^?10m²/s and 2 85×l0^?10m²/s for drying process considering no shrinkage and between 0.87×l0^?10m²/s and 1.61×l0^?10m²/s for process considering shrinkage. The activation energy was calculated assuming an Arrhenius' type equation. The values were 17.94 KJ/mol with the air velocity of 0.5 m/s and 21.94 kJ/mol with the air velocity of 3,0 m/s for effective diffusivity without shrinkage. The values were 2.04 kJ/mol with the air velocity of 0.5 m/s and 16.12 kJ/mol with the air velocity of 3.0 m/s for effective diffusivity with shrinkage. These low activation energy values, calculated considering the shrinking effect, show that the side effects during drying reduces the effective diffusivity dependence on temperature     

铸造Mg-2%Ca合金的拉伸蠕变和抗腐蚀性能(英文)

对分别添加Zn和Al的Mg-2%Ca合金的拉伸蠕变和抗腐蚀性能进行比较。结果表明:添加Zn比添加Al能更加显著地提高Mg-2%Ca合金在170°C下的蠕变性能。然而,添加Al对提高合金的耐腐蚀性能更为有效。由于添加Zn的合金的凝固区间更为宽大,因此,为了生产高质量的铸件产品,对铸造工艺的控制要求更加严格。