含磺酸异丁酯单元的热敏树脂及其成像性能研究

为了构筑高亲和性变化成像体系,合成了p乙烯基苯磺酸异丁酯单体（IBSS）,并将其与苯乙烯（St）,甲基丙烯酸（MAA）共聚得到一种热敏树脂,通过IR1、H NMR、GPC、DSC、TG分别确认了其结构、组成、分子量、热分解和热稳定性,并采用该树脂与红外染料匹配构筑热敏成像体系。结果表明,该树脂在100℃以下具有较好的热稳定性,由该树脂构筑的热敏成像体系经过曝光、显影后能够发生较大的亲和性变化,得到较清晰的图像。     

超临界CO2萃取法和乙醇回流提取法提取大高良姜中1''''-乙酰氧基胡椒酚乙酸酯的比较

本实验采用CO2超临界流体萃取法(CO2-SFE)和乙醇回流法提取大高良姜的有效成分1'-乙酰氧基胡椒酚乙酸酯(ACA),通过硅胶柱纯化前后TLC图谱、HPLC图谱、有效成分ACA的含量及萃取物的物理指标为指标评价两种方法。结果表明:CO2-SFE提取物所含杂质较少,萃取的挥发油中ACA的含量达72.11%。CO2-SFE法得到ACA的净含量是乙醇回流法的5.6倍。用CO2-SFE提取大高良姜中的ACA明显优于乙醇回流法。     

选择不同提取剂制备斑点叉尾鲴鱼皮胶原蛋白的研究

选择不同提取剂对斑点叉尾鲴鱼皮胶原蛋白进行制备,并对胶原蛋白进行了部分定性研究。实验结果表明,4℃条件下,鲴鱼鱼皮先用0．1mol／LNaOH浸泡6h再用2．5％NaCl浸泡6h,比单独或同时使用NaOH、NaCl能更好的去除杂蛋白,用10％的异丙醇溶液去除脂肪,用0．1mol／L柠檬酸浸提3d能较好的提取胶原蛋白,无色无味,提取率可达34．67％。获得的胶原蛋白中甘氨酸含量丰富,质量分数为21．19％,其变性温度为50．2℃。SDS．PAGE实验结果表明,提取的鲴鱼皮酸溶胶原具有较高的纯度,含有两条α链,β链含量较高。鱼皮胶原蛋白溶液具有较高的黏度,且随着蛋白浓度的增大而增大。     

Dry Fractionation Approach in Concentrating Tocopherols and Tocotrienols from Palm Fatty Acid Distillate: A Green Pretreatment Process for Vitamin E Extraction

Palm fatty acid distillate (PFAD) is a rich source of vitamin E. As compared to other vegetable oil, PFAD has higher tocotrienol (70–80%) over tocopherol content, which makes it a valuable source for vitamin E extraction. Current vitamin E extraction methods are not sustainable due to the intensive usage of chemical and high operational cost. Hence, the present study investigated for the first time using dry fractionation process as a green and economical pretreatment method for separating solid fraction (stearin) and liquid fraction (olein) in order to concentrate vitamin E from PFAD in olein fraction. We examined the dry fractionation conditions: crystallization ending temperature (36–44 °C), cooling rate (0.3 and 1.5°C min⁻¹), stirring speed (20–125 rpm), and holding time (0–60 min) on the composition of unsaturated and saturated fatty acids as well as vitamin E content in liquid fraction (olein) and solid fraction (stearin) using gas chromatography and high performance liquid chromatography, respectively. In most of these conditions, vitamin E was ultimately higher in olein fraction as compared to stearin fraction, which is correlated with the high degree of unsaturation. Under a cooling rate of 0.3°C min⁻¹, 90 rpm stirring speed, and ending crystallization of 38 °C, the highest vitamin E rich olein fraction was attained with 1479 ± 10.51 ppm in 50 g olein fraction as compared to 1366 ± 7.94 ppm in 500 g of unfractionated PFAD.     

大红山铜矿285中段连续开采中胶结矿柱经济分析

大红山铜矿285中段铜铁合采区原矿品位较低,采用胶结充填体置换矿柱开采可能亏损,矿山未建立胶结充填体置换矿柱开采的利润测算方法。利用285中段铜铁合采区标准矿块测算胶结矿柱开采的直接成本,结合中段建设费用分摊和销售费用,建立胶结矿柱开采的利润测算方法,最终完成285中段胶结矿柱开采的利润测算,为胶结矿柱开采提供指导依据。     

针阀体压力室去毛刺工艺方法研究

就喷油器总成的核心零件——针阀体压力室去毛刺的各种方法,进行了分析研究,提出了针阀体喷孔去毛刺切实可行的方法。     

12.5 μm碲镉汞长波红外探测器暗电流研究

随着红外探测器技术的发展,延长探测器的工作波长成为重要的发展方向之一。由于工作波长随x值的变化而带隙可调,碲镉汞材料得到了广泛应用。随着波长增长,暗电流成为限制红外探测器发展的主要因素。以12.5 μm碲镉汞长波红外探测器为例,通过仿真研究了工作温度和固定电荷对其暗电流的影响,并对77 K和60 K下不同种类的暗电流进行了分析。该研究使我们对12.5 μm探测器的暗电流具有更深入的了解,为提高12.5 μm探测器的制备水平提供了方向。     

URLLC技术研究及其在智能网联行业的应用探讨

URLLC其低时延高可靠的特性为智能网联业务的实现提供了强有力的支撑。首先简要概括URLLC技术研究的背景,随后针对URLLC实现的重点关键技术进行描述,最后给出基于URLLC技术的智能网联应用的网络架构和部署建议。     

基于移动网数据的城市交通分析研究

传统的智慧交通数据采集方式,包括交通调查、定点监测、摄像机摄像等,技术成熟且精度较高,然而其缺点也非常明显,采集范围小、成本高、施工周期长。而电信行业的大数据具有实时性强、数据量大、覆盖人群广、成本低廉、信息丰富等特点,可为城际交通和市内交通提供丰富的数据支持。基于移动网用户侧计费账单、计费详单以及XDR数据,给出了典型交通应用场景下的分析方法及应用案例。     

Physicochemical stability of calcium alginate beads immobilizing TiO2 nanoparticles for removal of cationic dye under UV irradiation

Recently, there have been considerable interests to immobilize photocatalyst in alginate beads for removing pollutants from water sources. However, the feasibility of using alginate beads in industry largely depends on its long‐term stability during operation. This study investigated the physicochemical stability of alginate/titanium dioxide beads (Alg/TiO₂) when exposed to UV irradiation in aqueous environment. The degradation of Alg/TiO₂ beads was evident because the diameter and mass of the beads was reduced by 12% and 40%, respectively, after 120 h of irradiation. A substantial amount of TiO₂ was leached into the external medium. Consequently, the removal efficiency of model cationic dye was found to reduce after every process cycle. Morphological analysis showed the formation of cavities on the surface of the Alg/TiO₂ beads. Interestingly, the blank alginate beads degraded more rapidly than the Alg/TiO₂ beads, confirming the UV‐shielding effect of TiO₂. Nevertheless, this study reveals the need to improve the UV stability of alginate‐based beads before they can be considered for practical application. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017 , 134, 45002.