安顺市市售果味饮料中合成色素现况调查

目的:通过对市售果味饮料的抽样检测分析,了解安顺市市售饮料中合成色素的添加情况,为饮料监管提供科学依据。方法 :在安顺市主城区采集171份饮料,使用高效液相色谱法对其中的合成色素进行检测,对相关数据进行汇总分析。结果:在抽检果味饮料中,合成色素总的检出率为72.5%。添加使用率最高的是柠檬黄为35.7%,最低的是靛蓝和亮蓝均为2.9%。同时添加2种及以上合成色素饮料的占35.7%。在不同销售场所中,中小型超市检出率最高为79.5%,大型超市检出率最低为38.9%,各销售场所检出率总体差异具有统计学意义(X~2=11.157,P 0.05)。外地和本地产果味饮料中合成色素检出率分别为72.3%和70.7%,两者检出率差异无统计学意义(X~2=0.038,P 0.05)。结论:安顺市售果味饮料中合成色素含量均在国家标准范围内,但添加使用率较高,建议相关部门继续加强监管和宣传,保障食品安全。     

Meat quality in pigs subjected to minimal preslaughter stress

The experiment compared meat quality in carcasses from pigs subjected to the absolute minimum of stress preslaughter with that from carcasses of pigs subjected to simulated commercial handling. A total of 120 pigs (85 kg) were used. They were a commercial hybrid and were processed in six equal batches. The minimal stress group were slaughtered with as little stress as possible. The simulated commercial handling group were mixed and transported for 2hr (80 km) and lairaged for 30 min. Simulated commercial handling increased plasma cortisol, plasma lactate, CPK and beta-endorphin. Muscle temperature measured in the m. longissimus dorsi (LD) at 45 min increased as did the ultimate pH in the m. adductor (AD). Overall eating quality was not affected. There were batch affects on most variables. Males were leaner and produced meat that had greater abnormal fat odour, darker cooked colour, poorer pork flavour, lower overall acceptability and was tougher.     

某钢筋混凝土连续箱梁裂缝成因分析及计算研究

为了分析某普通钢筋混凝土箱梁在运营一年多后即出现严重开裂的原因,根据规范对箱梁截面设计与裂缝宽度进行了复核校验,结果满足规范设计要求,但实际最大裂缝宽度远大于规范限值。为此,利用数值模拟方法从车辆超载、荷载偏心、裂缝宽度分布等多个角度对裂缝的成因进行了分析。结果表明,超载与偏心是导致裂缝出现的主要原因,而箱梁裂缝最大宽度计算理论不完善是导致裂缝严重超标的重要原因。     

电磁连铸和微合金化对5356铝合金组织性能的影响

研究了不同电源功率、拉坯速率和冷却水量等参数以及微量Sc元素对5356铝合金组织和性能的影响。结果表明,在电源功率10 k W,拉坯速率8 cm/min,冷却水量1.7 m3/h的工艺条件下,5356铝合金具有最优的表面和内部质量以及综合力学性能,抗拉强度、伸长率分别可达310.0 MPa和16.3%,且铸锭表面无明显铸造缺陷,边部组织基本为等轴晶,心部组织呈破碎枝晶形态,第二相分布均匀。5356铝合金合理的均匀化处理工艺参数为440℃,30 h,空冷,均匀化处理后合金元素Mg的微观偏析基本消除,在晶界连续分布的Al8Mg5相明显回溶。微量的Sc元素显著提高5356铝合金的强度和塑性。实验证明,5356Al+0.4%Sc(质量分数)合金晶粒明显细化,第二相数量减少,抗拉强度和伸长率达330.0 MPa和29.0%,分别提高6.5%和77.9%。     

油田用咪唑啉季铵盐缓蚀剂的合成及性能评价

以油酸、二乙烯三胺及季铵化试剂为主要原料,合成了适用于油田的眯唑啉季铵盐缓蚀剂。确定了该缓蚀剂的最佳合成条件：油酸和二乙烯三胺摩尔比为1：1．2,酰胺化反应温度160℃、反应时间1．5h,环化反应温度220℃、反应时间6．5h,季铵化试剂为硫酸二甲酯,其与咪唑啉中间体摩尔比为1：1,季铵化反应温度50℃、反应时间2．5h。性能评价表明,该咪唑啉季铵盐缓蚀剂在模拟油田现场盐水中具有良好的缓蚀性,当与OP-10、SDS、K1分别复配时,均显示良好的协同效应,并且具有较好的水溶性。     

高超纯乙炔中杂质含量的分析

采用气相色谱法、电化学法、露点法测定高纯、超纯乙炔中的各种杂质,从而对产品质量进行定量分析与及时有效的监控。     

633 nm激光辐射沿心包经脉线传输特性的实验测量

基于生物医学光学的原理与测量技术,设计了无损检测光波沿人体经脉线传输特性的实验方案,测量了633 nm光波沿心包经脉线和旁开非经脉线方向的光波辐出度特征,分析了光波调制频率对测量光信号的影响.实验对象为20例健康青年志愿者,实验结果采用医学统计软件SPSS13.0进行统计分析.研究初步表明:光波沿经脉线方向和非经脉线方向的光强度衰减差异明显(P＜0.01),且光波沿经脉线方向的衰减小于非经脉线方向;在低频范围内,光波调制频率越大,光波沿经脉线的衰减越快.     

PM+安全监理信息化系统探讨

在互联网时代,传统行业中的监理安全管控如何统一标准规范,运用大数据技术开展安全生产规律性、关联性特征分析,提高安全生产决策科学化水平将成为安全监理今后的发展方向。本文试图从目前安全监理管控的模式入手,以互联网的角度审视现阶段安全管控的弊端;以信息化管控的趋势分析安全管控发展的趋势,结合PM+安全管理信息化系统的运行,试图找到互联网时代安全监理管控的数据智能化管控方向。     

Influence of carbohydrate source and buffer on rumen fermentation characteristics, milk yield, and milk composition in late-lactation Holstein cows

The effects of concentrate-to-forage ratio and buffer on rumen fermentation and production parameters were examined in four rumen-cannulated cows (240 +/- 18 d in milk) fed a total mixed ration ad libitum in a 4 x 4 Latin square design. The treatments were a 50:50 concentrate to forage ratio with [1.2% of dry matter, (DM)] and without (0% of DM) buffer and a 75:25 concentrate to forage ratio with (1.2% of DM) and without (0% of DM) buffer. Rumen pH declined in response to increased concentrate but was not influenced by buffer. In the absence of the buffer, rumen acetate declined and propionate was elevated at the higher level of concentrate inclusion. The milk fat concentration was lower for cows fed the high concentrate diet without buffer; however, the addition of buffer to the diet prevented the milk fat depression. Milk fat depression was associated with elevated trans-C18:1 fatty acids in milk, which provides additional support for an inhibitory effect of these fatty acids on mammary fat synthesis. We concluded that the potential of nutrition as a tool to alter milk composition is greater in later lactation as these animals are better able to cope with the negative effects of high grain diets, and the treatment response is greater than in early lactation.