A NONDESTRUCTIVE METHOD TO MEASURE RESIDUAL ADSORPTION CAPACITY OF CHARCOAL FILTERS

High surface area charcoal bed filters have been used for over a half a century to adsorb undesirable vapors from gas streams. One problem encountered when using these niter beds is that there is presently no simple, reliable, nondestructive method to measure their Residual Adsorption Capacity, RAC. This is particularly critical in situations where harmful vapors are being adsorbed.

An investigation has been underway to use pulses of weakly adsorbed gases such as ethane and/or methane to measure RAC. The hypothesis being that these weakly adsorbed gases will “count” unoccupied adsorption sites. In the present study, dimethyl methylphosphonate (DMMP) was used to “irreversibly” occupy available siles to various extents on different niters. The Reduced Retention Time. θ, (the ratio of the adjusted retention time to the space time) and the Resolution (R) between peaks of methane and ethane were found to correlate to RAC under dry and wet (humid) conditions.     

A NEW LOOK AT THE OPTIMUM DIMENSIONS OF CONVECTIVE SPINES

The optimum dimensions of spines of various profiles are reexamined by taking into account the profile curvature effects. Simple working formulas for the optimum dimensions are proposed. When the ratio of spine width to length, δ₀/b₀, is set equal to zero, the present results are reduced to the earlier findings which are obtained on the basis of employing the length-of-arc assumption.     

Relationships Between Physicochemical Properties of Nonfish Protein and Textural Properties of Protein-incorporated Surimi Gel

The physicochemical properties of nonfish proteins were correlated with textural properties of nonfish protein gels and nonfish protein-incorporated surimi gels. Both cold and thermal hydration ability (by centrifugation) of nonfish proteins strongly correlated with compressive force (cohesiveness) of nonfish protein-incorporated surimi gel (r = 0.94 for cold; r = 0.95 for thermal). Hydrophobic amino acid groups in nonfish protein inversely correlated with compressive force (r =?0.88) and penetration force (r =?0.78) of nonfish protein-incorporated surimi gel. Thermal behavior of nonfish protein affected the gel characteristics of nonfish protein and surimi with nonfish protein-incorporated.     

热轧带钢蛇行过程的动态模拟仿真

带钢在轧制过程中，由于一些因素影响会使带钢轧机左右受力不对称，从而产生蛇行现象。文中对影响蛇行的因素进行了分析，并应用Matlab软件对热轧带钢的蛇行过程进行模拟仿真，其结果与生产实际情况相符合。     

大脑快速 T1 图谱成像研究

大脑快速 T1图谱成像是一种量化磁共振成像技术,可以为帕金森、癫痫、肝脑病等脑部疾病的诊断提供重要参考依据。现有的大脑快速 T1图谱成像技术可以将成像速度提高到几秒/层,然而主磁场、发射场的不均性(尤其在高场下)以及大脑内部结构的磁化率差异,降低了成像精确性,限制了其在临床上的推广应用。针对上述缺点,文章提出一种基于 TurboFLASH技术的大脑快速 T1图谱成像方法,并先后在计算机仿真实验、仿体以及人体试验中进行验证。实验结果表明,文章提出的方法测得的大脑组织 T1值与金标准及文献中报导的值非常接近(误差＜3%),同时扫描速度提高到3秒/层,空间分辨率为1.1 mm×1.1 mm×4 mm,2分钟内即可完成全脑采集。     

稀疏近似最近特征空间嵌入标签传播

针对现有的基于图的半监督学习（graph-based semi-supervised learning,简称GSSL）方法存在模型参数敏感和数据空间判别信息不充分等问题,受最近特征空间嵌入和数据稀疏表示思想的启发,提出一种稀疏近似最近特征空间嵌入标签传播算法SANFSP（sparse approximated nearest feature space embedding label propagation）.SANFSP首先利用特征空间嵌入投影点来稀疏表示原始数据;然后,度量原始数据和稀疏近似最近特征空间嵌入投影间的相似性;进而提出稀疏近似最近特征空间嵌入正则化项;最后,基于传统GSSL 方法的标签传播算法,实现数据标签的平滑传播.同时,还将SANFSP 算法简单拓展到out-of-sample 学习.SANFSP 算法在人造和实际数据集（如人脸识别、可视物件识别以及手写数字分类等）上取得了有效的实验结果.     

冷成型钢截面残余应力的有限元分析

冷成型钢截面上的残余应力可能是决定其性能和强度的一个重要因素。通过破坏性的试验方法对残余应力进行测量不仅费时,精度也很有限。本文提出了一个预测压弯成形薄壁截面上残余应力的有限元方法,该方法克服了实验室测量的缺点,提供了一个有力的工具来考察不同的成形参数对残余应力的大小和分布的影响,并因此可以对这些成形参数进行优化。在该方法中,通过解析的方法考虑了成卷和开卷的影响,并将得到的残余应力作为随后的冷弯过程有限元模拟的初始应力。经比较,本文方法的数值结果和实验室实测值吻合很好,证明了该方法的可行性和精度。本文方法给出了整个截面残余应力的分布和沿壁厚的变化,并解释了两个相同截面中残余应力可能会存在很大差别的原因。