连铸中间包内三维湍流流动的数值模拟

连铸中间包的操作条件决定了其内流动现象的复杂性，为此，本文选择两种不同的湍流模型ｋ－ε和ＬＥＳ（Ｌａｒｇｅｅｄｄｙｓｉｍｕｌａｔｉｏｎ），建立了描述连铸中间包内三维湍流流动的数学模型，并实施了数值计算和模型验证，对单流中间包内的流动现象进行了描述，考察了有，无流动控制情况下中间包内的流动特征和湍流模型的合理性，结果表明，合理的流动控制有利于中间包内非金属夹杂的上浮和吸附，用ｋ－ε模型基本上能够描述     

Chaotic synchronization using monolithic Chua oscillators†

This paper presents experimental evidence of the synchronization between two monolithic chaotic oscillators. These oscillators have been fabricated using g_m — C design techniques in a 2-4 μm double-poly n-well CMOS technology. The circuit realizes an oscillator from Chua's circuit family and features electrical control of the parameters in the piecewise-linear function and on-chip tuning of the oscillator natural frequencies. The area of the circuit including pads is 5 mm² and the power dissipation is less than l-8mW for a symmetrical biasing of ±2.5V.     

Texture of Yeast Breads Containing Soy Protein Isolates: Sensory and Objective Evaluation

Three soy protein isolates were substituted on an equal protein basis for soy flour in a yeast bread formula. The consumer texture profile technique was used for sensory evaluation of the breads. A compression cage attached to an Instron was used for objective evaluation of textural characteristics. Panelists noted differences in smoothness, uniformity of cell distribution, chewiness, greasiness and crumbliness among the soy-containing breads. Deviations from the perceived ideal bread were shown for most textural characteristics. Soy isolates influenced volume, specific volume, hardness, springiness, gumminess and chewiness of the breads.     

吹氩精炼钢包内三维流动和混合现象的研究

利用开发的三维适体数值计算软件对吹气精炼钢包内的流动和混合过程进行了数学模拟，考察了操作参数对钢包内流动方式和混合的影响，提出了描述钢包内混合时间的代数表达式和合理的喷吹位置．数值模拟结果与实测值在定量上吻合较好．     

EFFECTS of CONTROLLED ATMOSPHERE ON QUALITY of MINIMALLY PROCESSED APPLE (cv. JONAGORED)

Controlled atmosphere (2% O₂+ 4% to 12% CO₂) storage was found to be advantageous over air storage in terms of overall preservation of fresh-cut apple (cv. Jonagored). After 3 days, CA-stored apple cubes were firmer, showed better color and higher content of fructose and soluble solids content than air-stored cubes. In relation to color preservation this benefit was increased when CO₂ in the atmosphere was increased to 12% CO₂. Controlled atmosphere storage showed no advantage over air storage in relation to sensory evaluation of firmness and flavor.     

修复“救”不同

储水修复 ——急救"假老化" 在令人困扰的秋季,夏日紫外线所造成的伤害尚来消退,肌肤又要面对换季的新压力.面对骤降的气温和湿度,肌肤最容易干燥、缺水.此时的暗沉、粗糙,如果不及时修复,就会让这种"假老化"变成真老化,成为无法修复的"永久牌"暗沉、粗糙.想让肌肤保持水润柔滑的状态,轻松舒适地度过换季期,就要好好地为肌肤储存水分——时刻不间断地给肌肤补水,正是急救修复的第一要义. 虽然道理如此,可要真正达到目标,人类一直在为此不懈努力.     

Accurate Modeling of the Spiral Bevel and Hypoid Gear with a New Tooth Profile

Distinguishing with traditional tooth profile of spiral bevel and hypoid gear, it proposed a new tooth profile namely the spherical involute. Firstly, a new theory of forming the spherical involute tooth profile was proposed. Then, this theory was applied to complete parametric derivation of each part of its tooth profile. For enhancing the precision, the SWEEP method used for formation of each part of tooth surface and G1 stitching schema for obtaining a unified tooth surface are put forward and made the application in the accurate modeling. Lastly, owing to the higher accuracy of tooth surface of outputted model, it gave some optimization approaches. Given numerical example about the model can show that this designed gear with spherical involute tooth profile can achieve fast and accurate parametric modeling and provide a foundation for tooth contact analysis （TCA） in digitized design and manufacture.