Multi-walled carbon nanotubes-based magnetic solid-phase extraction for the determination of zearalenone and its derivatives in maize by ultra-high performance liquid chromatography-tandem mass spectrometry

A simple and rapid magnetic solid-phase extraction (M-SPE) procedure using multi-walled carbon nanotube-magnetic nanoparticles (MWCNT-MNPs) as sorbents was established for purification of zearalenone (ZEA), α-zearalenol (α-ZOL), β-zearalenol (β-ZOL), zearalanone (ZAN), α-zearalanol (α-ZAL) and β-zearalanol (β-ZAL) in maize. The main parameters affecting the clean-up efficiency were thoroughly investigated, and high purification efficiencies for all analytes were obtained. The resulting MWCNT-MNP-ultra-high performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS) method was validated for maize samples. The matrix effects were greatly minimized using the M-SPE approach, with signal suppression/enhancement values decreased from 69.9–127.6% to 92.1–103.8%. Consequently, complex matrix-matched calibration curves were not necessary and the calibrations constructed in acetonitrile could be applied for accurate quantification of the targeted mycotoxins in real samples. The average recoveries ranged from 75.8 to 104.1% and the inter- and intra-day precision values expressed as RSDs, were all lower than 14%. Limits of detection and quantification were in the range of 0.03–0.04 and 0.07–0.10 μg/kg, respectively. The analytical performance of the developed method was also successfully evaluated with maize samples, and this method was proved to be a powerful tool for monitoring ZEA and its derivatives in maize.     

准连续Ti~(3+):Al_2O_3可调谐激光的研究

本文给出了Ti~(3+):Al_2O_3的准连续可调谐激光的实验结果。采用Nd:YAG内腔倍频532nm的准连续输出作为泵浦源,得到Ti~(3+):Al_2O_3的连续可调谐输出。波长覆盖范围为685nm到821nm。最大输出功率为293mW,斜率效率为20％,在805nm处的窄谱输出功率达240mW,总体转换效举为26％。     

含孔隙富铝聚四氟乙烯/铝含能材料冲击温升规律

为研究孔隙度对富铝含量聚四氟乙烯/铝(PTFE/Al)含能材料冲击温升效应的影响,采用考虑熔化效应的一维粘塑性孔洞塌缩模型,对该材料的冲击温升进行了理论分析.建立孔隙度分别为10％、20％、30％的富铝PTFE/Al细观离散化模型,并借助非线性动力有限元软件AUTO-DYN开展细观数值模拟,对冲击加载下含孔隙富铝PTF...     

MoS3/Al2O3复合材料的合成及其用于制备加氢催化剂的研究

采用液相反应沉积法合成MoS3/Al2O3复合材料,考察了不同反应温度、反应物浓度、反应时间、体系pH值及不同类型分散剂对MoS3在γ Al2O3载体表面沉积量的影响,并采用MoS3/Al2O3复合材料为助剂Co的第2载体制备了CoMo硫化态加氢脱硫催化剂;采用XRF、XRD、XPS、TEM、BET等分析手段对MoS3/Al2O3复合材料及CoMo硫化态和氧化态催化剂进行了表征。结果表明,采用乙醇为分散剂,钼酸钠摩尔浓度为01~1 mol/L、在反应温度85~120℃、体系pH值1~2、反应8~24 h条件下,可以合成MoS3沉积量为628%~868%（以MoO3质量分数计）的MoS3/Al2O3复合材料;与常规氧化态催化剂相比,所制备的CoMo硫化态催化剂具有更高的加氢脱硫活性。     

REGIONAL 3D MODELLING OF THE PERMO‐CARBONIFEROUS AL KHLATA FORMATION IN THE RIMA AREA,EASTERN FLANK OF THE SOUTH OMAN SALT BASIN

The glaciogenic Al Khlata Formation (Late Carboniferous – Early Permian) contains important reservoir and seal intervals in oil fields in southern Oman. Here we describe a 3D regional geological model of the Al Khlata Formation and the underlying Misfar Group in a 1750 km² area in the Eastern Flank of the South Oman Salt Basin. The Misfar Group (Devonian‐Carboniferous?) was included in the model because it also contains glaciogenic facies in the study area. The 3D model is based on wireline logs from 42 wells, palynological zonation in 31 wells, cores from three wells, and a 2011 3D seismic dataset from which three horizons (top‐Huqf, top‐Rahab Shale and top‐Gharif) were interpreted throughout the study area. The combined Al Khlata and Misfar interval varies in thickness in the area from 20 to 730 m over relatively short distances. These large variations in thickness were due to the creation of accommodation in mini‐basins resulting from the removal of underlying Infracambrian salt at the basin margin. In places, some of the available accommodation was occupied by Cambrian sandstones of the Nimr Group and Haima Supergroup, influencing the location and thickness of the Al Khlata mini‐basins. These local depocentres vary in scale, shape and orientation relative to the present‐day salt edge: some are ovoid in plan‐view, others more linear and parallel to the salt edge, and one takes the form of a narrow graben almost perpendicular to the salt edge. By the Early Permian, towards the end of Al Khlata time, deposits become more blanket‐like and uniform, indicating an external or more regional control on base level. Four key lithofacies have been distinguished from wireline logs and were populated zone‐by‐zone through the geological model: sandstone (reservoir), shale (seal), and sandy and silty diamictite. Sandstones are most common towards the base of the Misfar – Al Khlata interval and shales towards the top. The Rahab Shale (Early Permian) at the top of the Al Khlata Formation forms an important seal for oil fields in South Oman, often in combination with seals in overlying intervals. The Rahab Shale was the first widespread seal to be deposited which may have trapped oil migrating from the South Oman Salt Basin during the Palaeozoic. The most common lithofacies in the Misfar – Al Khlata interval in the modelled area is diamictite (60%), which is normally considered to be a waste‐rock lithology. However thick silty diamictites of sufficient extent can seal hydrocarbon accumulations, and some sandy diamictites have the potential to be unconventional reservoir rocks. Even after 50 years of exploration and production of oil from the Al Khlata Formation, there remains potential for further discoveries and overlooked pay zones due to its heterogeneous character and the occurrence of intra‐formational seals.     

金属材料对连续波红外激光的热耦合系数

我们采用自行设计研制的积分球,测量了几种不同表面状况的LY12铝合金靶对CWCO2激光(功率40W左右)的热耦合系数.与理想条件下的经典理论值相比,热耦合系数的测量值偏大,文中对此进行了分析.结果表明,材料的表面缺陷将增强对入射激光的热耦合.     

核壳纳米复合粒子的结构设计、制备与表面反应功能化

以乳液聚合为主要手段,研究了制备高分子基纳米复合材料的高效而又具有较好普适性的方法,实现了聚合物对A l2O3,CaCO3,ZnO,T iO2无机纳米粒子的包覆。并通过引入交联结构、壳层使用亲水共聚物以及界面引入化学键等方式,克服了一般乳液聚合中产物结构严重依赖于核壳组分亲水性的缺点,大大提高了核壳纳米复合粒子结构设计的自由度。在得到各种纳米复合粒子乳液的基础上,对纳米复合粒子实现了表面反应功能化,赋予了产物高产率和高接枝效率、表面官能团种类及含量和粒子形态结构高度可控等特征。     

载体对钯基选择加氢催化剂性能的影响

以常规浸渍法制备了一系列Pd基催化剂，考察载体结构、织构及组成对其加氢性能的影响。采用程序升温技术（TPR-H2、TPDCO）对催化剂进行了表征和相应分析。结果表明，Al2O3载体中以高温1100℃焙烧后形成的占晶型具有更高的乙烯选择性。Pd基催化剂的Al2O3载体预先修饰MgO或CeO2后，能获得良好的金属分散度和适宜的反应物的吸附及产物的脱附特性，使得在高氢／炔体积比下催化剂样品上乙烯收率也维持在80％左右。在非Al2O3型载体制备的催化剂中，与金属Pd存在强相互作用的TiO2载体制备的催化剂的催化性能优越，最优样的乙烯收率达到95％。催化剂表面的Pd^hHx物种和Pd—C结合能在很大程度上影响着H2吸附活化和乙烯脱附能力，这对选择加氢性能有至关重要的作用。     

凝胶成型法制备加氢催化剂载体的研究与工业化生产

采用凝胶成型法制备加氢催化剂载体，并进行了工业放大试验。通过BET、NH3-TPD、H2-TPR等表征手段及实际的加氢反应性能评价对凝胶成型法制备的载体及加氢催化剂与常规方法进行对比分析，结果表明，采用凝胶成型法所制得的载体及催化剂均具有较高的孔体积和比表面积、较低的堆密度，其机械强度可满足工业要求，总酸量及中强酸酸量得到提升，催化剂活性组分与载体强结合力得到削弱，金属利用率提高，应用性能明显优于传统方法制备的加氢催化剂载体。通过该方法完成了加氢催化剂载体的工业生产，所生产的载体应用于天津院THDS-3加氢精制催化剂取得了良好的工业应用效果。     

氟聚物基活性材料释能及毁伤特性研究进展

氟聚物基活性材料是一种具有冲击反应释能特性的新型材料,在军事领域具有广泛的应用前景。为掌握氟聚物基活性材料的释能与毁伤特性,推进其在高效毁伤战斗部中的应用,研究梳理了氟聚物基活性材料冲击释能反应行为以及引燃引爆、侵爆耦合毁伤效应的研究现状,着重介绍了分离式霍普金森压杆实验、准密闭弹道实验和爆炸加载实验等在释能特性方面的研究进展;毁伤特性方面整理了反应弹丸、破片及反应射流的相关研究进展,重点说明了氟聚物基活性材料在聚能装药中的应用设计和反应射流成型的研究成果,及相关的反应模型和数值仿真的研究。在此基础上,讨论了未来研究方向：建立系统性反应模型与仿真方法;通过配方、工艺等参数对其性能进行调控;释能反应观测表征技术的创新与探索以及工程应用设计等。