气调包装对平菇贮藏内在品质的影响

为了解气调包装(MAP)对平菇贮藏内在品质的影响,研究了经MAP处理后平菇多酚氧化酶(PPO)特性以及质构的变化。PPO活性是影响平菇货架期的内在因素之一。采用硫酸铵沉淀法得到平菇多酚氧化酶粗提液。试验结果表明,亚硫酸氢钠、柠檬酸均能有效地抑制平菇多酚氧化酶的活性,氯化钙对其影响不大。低温能有效地抑制平菇质构品质的下降,2.0% CaCl2处理效果比较明显,能达到延缓果实成熟和衰老的目的。     

渤海湾盆地埕岛油田馆上段沉积相研究

渤海湾盆地埕岛油田是我国极浅海地区第一个投入开发的大油田。综合应用沉积岩石学、地质学等多学科理论,从岩心描述入手,结合区域地质背景、岩心分析和测井等资料,全面分析了埕岛油田馆上段的岩石学特征、沉积构造特征、测井曲线特征和古生物特征等,确定了该区馆上段砂岩为河流相沉积,并运用多种河相判别参数对埕岛油田馆上段储层进行判别,进一步确定了该储层的亚相类型为曲流河,在此基础上总结了4种沉积微相特征和主力小层古水流方向,并对不同沉积微相的开发特征和开发效果进行了评价。      

碱金属改性的钒-钾催化剂催化环己烷氧化脱氢制环己烯

以γ-Al₂O₃为载体,采用浸渍法制备了以V和K为主活性组分、碱金属为助剂的M-3%V-6%K/γ-Al₂O₃系列(M=Li、Na、K、Cs)催化剂,并考察助剂种类对环己烷氧化脱氢制环己烯催化活性的影响。采用XRD、BET、NH₃-TPD、H₂-TPR和SEM对催化剂进行物化表征。XRD结果显示各活性组分均以无定形态存在;NH₃-TPD、H₂-TPR和SEM结果显示,碱金属助剂种类影响样品的表面酸性、氧化还原能力、活性组分的粒径和分散度。活性评价结果显示,经碱金属助剂修饰后的Na-3%V-6%K/γ-Al₂O₃表现出较好的催化性能,环己烯选择性达53.5%。     

浅谈计算机系统安全

随着计算机在日常生活中的普及,人们对计算机的依赖越来越强,计算机系统安全、数据安全成了一个必须引起高度重视的问题。通过备份数据、安装系统补丁、安装杀毒软件可以有效地保障计算机系统安全和数据安全。     

DDoS攻击模拟实验的设计与实现

DDoS攻击数据流在发生网络拥塞的情况下并不降低他们的发送速率,充满了路由器的缓冲区,剥夺其他正常数据流的带宽。基于这一网络行为,在网络仿真器NS中设计并实现了DDoS攻击模拟实验。     

6-inch uniform vertically-oriented graphene on soda-lime glass for photothermal applications

Vertically-oriented graphene (VG) has many advantages over flat lying graphene, including a large surface area, exposed sharp edges, and non-stacking three-dimensional geometry. Recently, VG nanosheets assembled on specific substrates have been used for applications in supersensitive gas sensors and high-performance energy storage devices. However, to realize these intriguing applications, the direct growth of high-quality VG on a functional substrate is highly desired. Herein, we report the direct synthesis of VG nanosheets on traditional soda-lime glass due to its low-cost, good transparency, and compatibility with many applications encountered in daily life. This synthesis was achieved by a direct-current plasma enhanced chemical vapor deposition (dc-PECVD) route at 580 °C, which is right below the softening point of the glass, and featured a scale-up size ～6 inches. Particularly, the fabricated VG nanosheets/glass hybrid materials at a transmittance range of 97%–34% exhibited excellent solarthermal performances, reflected by a 70%–130% increase in the surface temperature under simulated sunlight irradiation. We believe that this graphene glass hybrid material has great potential for use in future transparent “green-warmth” construction materials.

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Switching Vertical to Horizontal Graphene Growth Using Faraday Cage‐Assisted PECVD Approach for High‐Performance Transparent Heating Device

Plasma‐enhanced chemical vapor deposition (PECVD) is an applicable route to achieve low‐temperature growth of graphene, typically shaped like vertical nanowalls. However, for transparent electronic applications, the rich exposed edges and high specific surface area of vertical graphene (VG) nanowalls can enhance the carrier scattering and light absorption, resulting in high sheet resistance and low transmittance. Thus, the synthesis of laid‐down graphene (LG) is imperative. Here, a Faraday cage is designed to switch graphene growth in PECVD from the vertical to the horizontal direction by weakening ion bombardment and shielding electric field. Consequently, laid‐down graphene is synthesized on low‐softening‐point soda‐lime glass (6 cm × 10 cm) at ≈580 °C. This is hardly realized through the conventional PECVD or the thermal chemical vapor deposition methods with the necessity of high growth temperature (1000 °C–1600 °C). Laid‐down graphene glass has higher transparency, lower sheet resistance, and much improved macroscopic uniformity when compare to its vertical graphene counterpart and it performs better in transparent heating devices. This will inspire the next‐generation applications in low‐cost transparent electronics.     

流式细胞仪在海洋无脊椎动物细胞学研究中的应用

简要概述了流式细胞仪的工作原理以及在海洋动物细胞学研究中流式细胞仪的应用。包括对海洋动物主要是无脊椎动物血细胞的分类及其功能的研究和海洋无脊椎动物多倍体育种中染色体倍性检测等。