Effects of salt-induced changes in protein network structure on the properties of surimi gels: computer simulation and digestion study

Surimi is considered a new base ingredient in special dietary foods because of its excellent gel formation properties and nutritional value. Cross-linked network structures are the basis for the formation of protein hydrogels. In this work, protein network structure induced by NaCl was investigated to evaluate its effects on texture property and digestibility of surimi gels. Micro-protein frameworks were investigated by scanning electron microscope combined with computer simulation, which indicated that the network structure became fine and smooth as a result of salt treatment. The digestibility of surimi with NaCl was higher than that of blank samples in simulated gastric juice in first 30 min, whereas the digestibility showed no significant difference (P = 0.257) in intestinal juice after 180 min. This work aids in understanding of the contribution of salt to the mechanism of surimi gels formation, and its effects on digestion, thus supporting potential applications in special dietary food.     

Origin of (103) plane of ZnO films deposited by RF magnetron sputtering

(103) diffraction has been observed at X-ray diffraction (XRD) patterns of columnar Al-doped ZnO (AZO) thin films grown along [001] direction deposited by RF magnetron sputtering. As the X-ray incidence angle employed in grazing incidence XRD increased, the ratio of I(103)/I(002) became smaller. Similar results have also been observed when the films became thicker, which induced that the origin of the (103) diffraction might be related to the surface structure of AZO film. The surface structure could be affected by the movement or diffusion of atoms at the final stage of the sputtering process.     

GB 28481-2012《塑料家具中有害物质限量》标准解读

2012年颁布实施的GB 28481-2012《塑料家具中有害物质限量》是一部针对家具中有毒有害物质测定的限量标准,标准的出台完善了我国家具有毒有害物质检测方法标准体系。本文对标准的邻苯二甲酸酯、重金属、苯并{a}和多环芳总量、多溴联苯和多溴联苯醚等有毒有害物质前处理和检测方法以及同分异构体的限量值进行了较详细的介绍,并对确立技术指标的依据和来源进行了分析,为该标准发布后得以更好地贯彻实施提供了可行的指导和参考。     

退火时间对FeCuSiBAl纳米晶/非晶复合材料的纳米压痕力学行为的影响

采用充氩气的电弧熔炼加单辊甩带法制备一种FeCuSiBAl非晶合金,然后在831K下恒温退火,研究退火时间对非晶合金的显微组织与纳米压痕力学行为的影响。结果表明,FeCuSiBAl非晶合金退火时在非晶基体中产生纳米晶,纳米晶化程度随退火时间延长而增加。在60min退火时间内,合金的硬度随退火时间延长而增大,退火时间超过60min后,硬度开始下降。退火以及降低载荷都导致合金的弹性模量增大。     

Spatio-temporal analysis of precipitable water vapour over northwest china utilizing MERSI/FY-3A products

Northwest China is considered as the arid and semi-arid temperate continental climate, where the precipitation is closely related to precipitable water vapour (PWV) content. In this paper, the Medium-Resolution Spectral Imager (MERSI) water vapour products were first used to study the spatial and temporal characteristics of water vapour over Northwest China, which were developed by the National Satellite Meteorological Center of China from the Chinese second-generation polar orbit Meteorological Satellite Fengyun 3A (FY-3A). In order to utilize the MERSI water vapour products, the MERSI 5 min water vapour product is compared respectively with global positioning system (GPS), Aerosol Robotic Network (AERONET) and Radiosonde water vapour data in situ datasets. The results show that the water vapour values of the MERSI product are a slightly lower than referenced data, and the accuracy of MERSI product compared with GPS water vapour is the most agreeable, with a mean absolute percentage error (MAPE) of 22.83%. The PWV content displays a typical spatial distribution pattern in Northwest China that it is the highest in the southeast, the second for the northwest and the lowest in the south-centre. The water vapour content over each province in a descending order is Shaanxi, Ningxia, west of Inner Mongolia, Xinjiang, Gansu and Qinghai. The seasonal variation of water vapour content over Northwest China appears to be lowest in winter, followed by spring, then for autumn, and highest in summer. The PWV content of each province in Northwest China shows the periodic inner-annual variation, that is, the PWV content is lowest in January, and gradually increases with time till it peaks in July, and then decreases monthly afterwards, which agrees with the quadratic polynomial model by months. The standard deviation of the water vapour content in summer is 0.533–1.027 mm, while that in winter is 0.262–0.527 mm.     

浅析水泥混凝土路面沥青罩面施工工艺及质量控制

结合柳州市潭中西路试验路段的施工实例,提出采用改性沥青混合料作为应力吸收层,并通过外掺改性工艺来提高路面抗车辙能力的新工艺,以及对旧水泥混凝土路面板的缺陷修复处理措施,为混凝土路面沥青罩面施工方法提供技术参考。     

LS-SVM and Monte Carlo methods based reliability analysis for settlement of soft clayey foundation

A method which adopts the combination of least squares support vector machine (LS-SVM) and Monte Carlo (MC) simulation is used to calculate the foundation settlement reliability. When using LS-SVM, choosing the training dataset and the values for LS-SVM parameters is the key. In a representative sense, the orthogonal experimental design with four factors and five levels is used to choose the inputs of the training dataset, and the outputs are calculated by using fast Lagrangian analysis continua (FLAC). The decimal ant colony algorithm (DACA) is also used to determine the parameters. Calculation results show that the values of the two parameters, γ and δ² have great effect on the performance of LS-SVM. After the training of LS-SVM, the inputs are sampled according to the probabilistic distribution, and the outputs are predicted with the trained LS-SVM, thus the reliability analysis can be performed by the MC method. A program compiled by Matlab is employed to calculate its reliability. Results show that the method of combining LS-SVM and MC simulation is applicable to the reliability analysis of soft foundation settlement.     

大型重载矿用卡车转向节有限元分析

用Pro/E软件对转向节进行三维建模,详细研究三种基本危险工况及两种组合工况下转向节的受力情况,并用有限元法分析危险工况下转向节的强度,得到各种工况下的应力-应变图。计算结果表明,转向节设计方案完全满足技术要求,为转向节进一步结构优化提供依据。     

凹山选矿厂多碎少磨工艺探讨

介绍了高效破碎技术——高压辊磨机对凹山选厂细碎产品进行半工业试验及阶段磨选试验研究的情况。试验结果表明，原矿入磨粒度和入磨量可大幅度降低，可提高选厂技术指标和生产能力，从节能、提质、环保等方面均可产出很大效益，具有较好的应用前景。