螺栓螺母在3D软件中的装配方法的研究

以UG为载体,用几种不同的方法,详细介绍机械设计中螺栓、螺母的装配方法,这些装配方法,也可以应用于其他机械设计的3D软件。     

铝合金阀杆螺母的应用及研究

介绍了铝合金阀杆螺杆材料耐磨损、耐腐蚀、耐高温及力学性能试验的结果和使用情况。给出并证明了铝合金阀杆螺母替代铜合金材料的适用工况及低成本实际作用和意义。     

Factors affecting the shelf stability of sunflower nuts

Dehulled, raw, whole sunflower kernels of high-oleic acid (HOA) and high-linoleic acid (HLA) types were shelf-stable at 23 and 37°C for over one year. Dry-roasted HOA kernels were more stable than dry-roasted HLA kernels. Oilroasted HLA kernels were more stable than dry-roasted ones. Stability of roasting oil and storage temperature had no appreciable effect on shelf stability of kernels.     

Aflatoxin evaluation in ready-to-eat brazil nuts using reversed-phase liquid chromatography and post-column derivatisation

A high-performance liquid chromatography-fluorescence (HPLC-FD) method for aflatoxin quantification in brazil nuts was developed. Samples of brazil nuts collected in Brazilian markets were extracted with methanol:water and cleaned using an immunoaffinity column. Aflatoxins were eluted with methanol and a post-column derivatisation was performed with bromine, using a Kobra Cell system. The optimised method for total aflatoxins was sensitive, with detection and quantification limits of 0.05 and 0.25 µg kg^–1, respectively. The method was accurate, with recovery values of 87.6%; 85.3% and 85.0% for 0.5, 5.0 and 14.6 µg kg^–1 spiked levels, respectively. It was shown that the method was applicable to brazil nuts. From a total of 95 brazil nut samples analysed from 21 São Paulo supermarket samples and 51 Manaus and 23 Belém street markets samples, 37.9% showed detectable levels of aflatoxins and three exceeded the recommended Codex Alimentarius limit of 10 µg kg^–1 for ready-to-eat brazil nuts.     

Improvement of a sample preparation procedure for multi-elemental determination in Brazil nuts by ICP-OES

Various sample preparation procedures, such as common wet digestions and alternatives based on solubilisation in aqua regia or tetramethyl ammonium hydroxide, were compared for the determination of the total Ba, Ca, Cr, Cd, Cu, Fe, Mg, Mn, Ni, P, Pb, Se, Sr and Zn contents in Brazil nuts using inductively coupled plasma optical emission spectrometry (ICP-OES). For measurement of Se, a hydride generation technique was used. The performance of these procedures was measured in terms of precision, accuracy and limits of detection of the elements. It was found that solubilisation in aqua regia gave the best results, i.e. limits of detection from 0.60 to 41.9 ng ml^?1, precision of 1.0–3.9% and accuracy better than 5%. External calibration with simple standard solutions could be applied for the analysis. The proposed procedure is simple, reduces sample handling, and minimises the time and reagent consumption. Thus, this can be a vital alternative to traditional sample treatment approaches based on the total digestion with concentrated reagents. A phenomenon resulting from levels of Ba, Se and Sr in Brazil nuts was also discussed.     

麦胚银杏饮料的研制

研究了麦胚银杏饮料的工艺流程，确定了最佳配方和操作要点，该饮料风味浓郁、口感柔和、具有保健功效。     

纳米金生物条形码技术检测坚果中的黄曲霉毒素B_1

利用金纳米颗粒、黄曲霉毒素B1(AFB1)多抗和互补纳米金探针链、条形码DNA链制备纳米金探针(NP),纯化后进行透射电子显微镜(TEM)、紫外-可见光谱(UV-vis)和浓度鉴定。将其与黄曲霉毒素B1单抗修饰的磁性微球探针(MMP)通过抗原抗体作用连接,制备MMP-AFB1-NP三明治复合物结构,利用实时荧光定量PCR(FQ-PCR)检测在高温低盐条件下解链的条形码DNA,通过考察反应结束后每个反应管内的荧光信号到达设定的域值时所经历的循环数值与相应起始模板拷贝数之间的线性相关程度,建立黄曲霉毒素B1的生物条形码检测方法,并对检测体系进行了方法学评价。结果表明,本实验所建立的方法具有快速灵敏、特异性高等特点,每个模板的循环数值与该模板的起始拷贝数的对数具明显的线性关系y=-2.9054x+54.581,r=0.9991,检测灵敏度远远超过酶联免疫吸附法(ELISA)可达10-8 ng/m L,批间批内差值匀小于5%,用建立的生物条形码检测方法(BCA)对结构类似物进行特异性交叉试验,特异性良好。本法可用于花生、腰果等坚果类食品中AFB1的痕量检测。     

电子自旋共振波谱法对干果类辐照食品的鉴定

研究电子自旋共振波谱法对干果类辐照食品的鉴定。分析开心果、核桃、桂圆的电子自旋共振波谱特征和样品干燥温度对信号强度的影响。结果表明：电子自旋共振特征峰信号强度与吸收剂量呈正相关,检测限为0.5kGy;进一步干燥时,开心果和核桃的最佳温度为40℃,桂圆的最佳温度为55℃;电子自旋共振特征峰的信号强度受微波功率影响,检测开心果、核桃、桂圆最佳的微波功率依次为0.59、0.37、0.24mW。通过电子自旋共振特征峰可判定干果是否经过辐照处理。     

Nutritional approach for designing meat-based functional food products with nuts

Meat and meat products are essential components of diets in developed countries and despite the convincing evidence that relate them to an increased risk for CVD, a growing consumption of meat products is foreseen. Epidemiological studies show that regular consumption of nuts, in general, and walnuts in particular, correlates inversely with myocardial infarction and ischaemic vascular disease. We assess the nutritional basis for and technological approach to the development of functional meat-based products potentially relevant in cardiovascular disease (CVD) risk reduction. Using the available strategies in the meat industry (reformulation processes) and a food-based approach, we address the design and development of restructured beef steak with added walnuts, potentially functional for CVD risk reduction. Its adequacy as a vehicle for active nutrients is confirmed by a pharmacokinetic pilot study in humans using gamma-tocopherol as an exposure biomarker in chylomicrons during the post-prandial state. Effect and potential "functionality" is being assessed by a dietary intervention study in subjects at risk and markers and indicators related to CVD are being evaluated. Within the conceptual framework of evidence-based medicine, development of meat-based functional products may become a useful approach for specific applications, with a potential market and health benefits of great importance at a population level.