EVG-3D墙板耐火性能研究

针对建筑材料EVG-3D板的防火隔热问题,通过试验检测EVG-3D板的保温隔热性能。结果表明:背火面单点最高温升为162.8℃,平均温升139.3℃,都符合现有规范要求,EVG-3D板试样无烟火冒出,且在实验结束后试件完整。由试验数据和试验现象得出EVG-3D板的保温隔热性能良好,并且环保性能也尤为突出。     

XOR-ed visual secret sharing scheme with robust and meaningful shadows based on QR codes

Quick response (QR) codes are becoming increasingly popular in various areas of life due to the advantages of the error correction capacity, the ability to be scanned quickly and the capacity to contain meaningful content. The distribution of dark and light modules of a QR code looks random, but the content of a code can be decoded by a standard QR reader. Thus, a QR code is often used in combination with visual secret sharing (VSS) to generate meaningful shadows. There may be some losses in the process of distribution and preservation of the shadows. To recover secret images with high quality, it is necessary to consider the scheme’s robustness. However, few studies examine robustness of VSS combined with QR codes. In this paper, we propose a robust (k, n)-threshold XOR-ed VSS (XVSS) scheme based on a QR code with the error correction ability. Compared with OR-ed VSS (OVSS), XVSS can recover the secret image losslessly, and the amount of computation needed is low. Since the standard QR encoder does not check if the padding codewords are correct during the encoding phase, we replace padding codewords by initial shadows shared from the secret image using XVSS to generate QR code shadows. As a result, the shadows can be decoded normally, and their error correction abilities are preserved. Once all the shadows have been collected, the secret image can be recovered losslessly. More importantly, if some conventional image attacks, including rotation, JPEG compression, Gaussian noise, salt-and-pepper noise, cropping, resizing, and even the addition of camera and screen noises are performed on the shadows, the secret image can still be recovered. The experimental results and comparisons demonstrate the effectiveness of our scheme.

     

新夹心楼板耐火性能及火灾修复后抗弯性能试验研究

对一种新型夹心板的耐火性能及火宅修复后楼板的抗弯性能进行试验研究,试件的耐火性能主要体现在构件的承载力、完整性和隔热性上.基于试验结果,重点分析夹心板的耐火极限和加固试件的承载力、变形能力、破坏形态和破坏机理等,得出板材在弹性、带裂缝、破坏阶段的钢丝网架和混凝土之间的相互作用,从而得到楼板在破坏时的最大承载力.结果表明...     

酶解法制备核桃谷蛋白-1 ACE抑制肽的工艺优化

为获得优质的核桃蛋白血管紧张素转化酶(ACE)抑制肽的制备原料及优化其制备工艺,采用连续提取法从脱脂核桃粕中依次分离出清蛋白、球蛋白、醇溶蛋白、谷蛋白-1和谷蛋白-2 5种组分蛋白,测定5种组分蛋白的占比及ACE抑制率,以ACE抑制率最大的组分蛋白作为原料采用酶解法制备ACE抑制肽,在筛选出最适酶解用酶基础上,采用单因素试验与响应面试验优化酶解制备核桃蛋白ACE抑制肽的工艺。结果表明：5种组分蛋白中谷蛋白-1占比仅次于谷蛋白-2,且其ACE抑制率最高,以核桃谷蛋白-1为原料,在筛选出胃蛋白酶作为酶解用酶基础上,经工艺优化得到最优的酶解法制备核桃谷蛋白-1 ACE抑制肽的工艺条件为酶解温度46℃、酶解时间6 h、酶用量4.2%(以底物质量计)、酶解pH 1.6,在该条件下所得核桃谷蛋白-1酶解液的ACE抑制率为(50.08±2.34)%。因此,核桃谷蛋白-1经胃蛋白酶酶解可生产ACE抑制活性较高的核桃多肽。