电光双向强度调制器的隔离度研究

设计和制作了应用于微波全双工收发系统的马赫-曾德尔型电光双向强度调制器。根据电光调制器中电信号对光信号的调制叠加原理,通过计算和仿真,分析了因调制电极设计电场与实际电场分布差异导致的器件隔离度劣化。通过对比不同调制电极结构的分析设计和仿真优化结果,得到3.5GHz以上频段隔离度优于-30dB的电光双向强度调制器设计结构。制备出的电光双向强度调制器在5~17GHz范围内隔离度优于-30dB。     

中国锂离子电池质量安全状况分析

阐述了世界锂离子电池产业的发展状况,总结了我国锂离子电池的整体质量安全状况和存在的主要质量问题,并从技术和行业角度简要分析了目前我国锂离子电池产业存在的主要问题。     

金属外壳封接用双层玻坯的研制

以BH—G/K玻璃为基体,以添加Al2O3粉的DM—308玻璃为表层区研制出与金属外壳封接的双层玻坯。分析了Al2O3粒度及添加量对熟坯致密化和线收缩率的影响。结果表明,表层区使用添加质量分数为20%和30%0.5μm粒径Al2O3粉的DM—308玻璃可以实现熟坯的匹配收缩,用于UP2113—14外壳熔封。电镀后外壳气密性、绝缘电阻均有数量级提高,玻璃沿引线上爬高度只为BH—G/K玻璃的1/3,显著降低外壳盐雾试验后引线根部易锈蚀和引线受力后绝缘子开裂的风险。     

A Novel Approach to Open “Dead Space” and Modify Interfacial Features of Carbon Nanotube Assemblies by a Microwave Shock

Despite 30-year development of carbon nanotube (CNT) based materials, harnessing the outstanding nanoscale properties of individual CNT for macroscale applications remains challenging. High specific surface area, a crucial feature of CNTs, often suffers from the formation of tightly packed bundles with inaccessible “dead space”. Herein, a novel “microwave shock” approach to open the “dead space” trapped within bundles is reported. Employing N₂ ambient during microwave irradiation, CNT bundles undergo an efficient structural alteration and interfacial modification simultaneously due to the strong radiative coupling, while the graphitic structure remains undamaged. In this way, a 15-fold increase (from 42 to 648 m² g⁻¹) in the interstitial surface area as well as the lithiophilic functionalization (≈1 atom% nitrogen doping) are achieved without the degradation of other properties. Furthermore, to highlight the merits of this microwave shock process, the treated CNT films are applied as a host material for the anode in a lithium metal battery and demonstrate the suppression of dendritic lithium growth and improve cycling stability. This microwave shock approach provides an efficient avenue to modify nanocarbon-based materials for further applications.     

A Boronate Ester Driven Rechargeable Antibacterial Membrane for Fast Molecular Sieving

Membrane decorated with biocides is an effective way to suppress biofilm growth. However, their immediate biocidal effect usually suffers from a significant decline due to the irreversible consumption of the biocides. Here, a smart nanofiltration membrane is reported with rechargeable antibacterial capability that is fabricated by a facile interfacial polymerization via 3-aminophenylboronic acid and trimesoyl chloride on a polysulfone substrate. Biocides bearing diol groups can be grafted onto the membrane surface under neutral/alkaline condition and then released from the surface under acidic environment, due to the pH-responsive feature of boronate ester complexes. The resultant membrane exhibits integrated properties of fast bacterial inactivating efficiency, rechargeable antibacterial capability, and impressive stability. In addition, the achieved membrane shows remarkable separation efficiency to dye/monovalent salt system. The successful fabrication of the membrane with rechargeable anti-bacterial property provides new insights into the development of pH-responsive and sustainable antibacterial membranes.     

叶轴形状对旋风子性能影响的研究

对一种高浓度盐雾分离装置——旋风子进行研究,并对3种叶轴形状的旋风子进行了额定工况下的数值模拟,模型一为叶轴形状为空心圆柱形、模型二为细长实心圆台形、模型三为短粗实心圆台形,给出了相应模型的阻力特性和不同颗粒直径下的分离效率特性。同时在专门风洞实验台上进行了3种模型的阻力和分离效率特性实验,实验结果表明模型二分离效率较稳定,且阻力损失相对也较小,总体性能优于其它两种形式。将实验结果与数值模拟结果进行比较,吻合情况良好,为进一步的研究提供了参考资料。     

渤海湾盆地沾化凹陷渤南洼陷古近系深层优质储层形成机制

随着勘探程度的提高,渤海湾盆地渤南洼陷油气勘探的主要对象逐渐由中浅层转向中深层。深层勘探的关键问题是优质储层,其发育取决于沉积充填和地层流体的相互作用。古近系沙河街组四段沉积时期,该区发育了咸化环境湖相碎屑岩与膏盐层沉积。利用钻井、实验等基础资料,分析储层沉积环境、地层水特征、岩石学特征及成岩作用类型,探讨深层优质储层发育演化机制。研究结果表明：(1)在分布面积广、沉积厚度大的膏盐层的封闭下,咸化湖泊环境的沙四段碎屑岩,早成岩期经历了碱性成岩环境,形成的碳酸盐胶结物充填原生孔隙,并有效阻滞压实作用的发生;(2)随着烃源岩中的有机质趋于成熟,中成岩期有机酸在异常高压的驱动下向地层中运移,早期碳酸盐胶结物以及长石、岩屑普遍被溶蚀,形成次生孔隙,酸碱交替作用是深层优质储层发育的主要机制;(3)优质储层的发育受到膏盐层分布、烃源岩发育、断裂体系与碎屑沉积体展布的控制,受酸碱流体影响强烈的缓坡扇三角洲和陡坡近岸水下扇中前端砂体,是渤南洼陷沙四段优质储层发育区。     

Fracture gradient prediction: an overview and an improved method

Abstract The fracture gradient is a critical parameter for drilling mud weight design in the energy industry. A new method in fracture gradient prediction is proposed based on analyzing worldwide leak-off test (LOT) data in offshore drilling. Current fracture gradient prediction methods are also reviewed and compared to the proposed method. We analyze more than 200 LOT data in several offshore petroleum basins and find that the fracture gradient depends not only on the overburden stress and pore pressure, but also on the depth. The data indicate that the effective stress coefficient is higher at a shallower depth than that at a deeper depth in the shale formations. Based on this finding, a depth-dependent effective stress coefficient is proposed and applied for fracture gradient prediction. In some petroleum basins, many wells need to be drilled through long sections of salt formations to reach hydrocarbon reservoirs. The fracture gradient in salt formations is very different from that in other sedimentary rocks. Leak-off test data in the salt formations are investigated, and a fracture gradient prediction method is proposed. Case applications are examined to compare different fracture gradient methods and validate the proposed methods. The reasons why the LOT value is higher than its overburden gradient are also explained.     

东濮凹陷古近系沙河街组烃源岩生烃底限及其差异探讨

随着油气勘探不断向地层深部拓展,弄清烃源岩层生烃底限对于确定含油气盆地有效勘探领域范围和评价油气资源潜力都具有十分重要的意义。为此,以渤海湾盆地东濮凹陷古近系沙河街组烃源岩为研究对象,根据烃源岩层生排烃机理,采用有机元素变化分析法、生烃潜力法、残留烃量法和排烃量法4类7种方法对该区烃源岩的生烃底限进行了研究。结果表明:1用不同方法确定的沙河街组烃源岩生烃底限相差不大,全区生烃底限对应的镜质体反射率值(Ro)介于3.23%~3.97%,平均为3.71%,全区生烃底限对应的深度H值介于5 244~5 525m,平均为5 433 m;2凹陷北部生烃底限Ro介于3.61%~3.97%,平均为3.81%,其生烃底限H值介于5 415~5 545m,平均为5 488 m;3凹陷南部生烃底限Ro介于3.20%~3.74%,平均为3.48%,其生烃底限H值介于5 265~5 375m,平均为5 278 m。结论认为:该区南、北地区生烃底限存在差异,北部地区生烃底限对应的热演化程度(Ro)值和深度值明显高于南部地区,这与凹陷北部沙河街组发育巨厚膏盐层有关,主要体现为南、北地区在有机质类型、地层温度和压力等方面存在着差异性。     

石墨烯作为锂基润滑脂添加剂的摩擦学性能研究

利用四球机研究了石墨烯和石墨作为锂基润滑脂添加剂的摩擦学性能。采用扫描电镜和X射线光电子能谱研究了磨损表面的微观形貌和表面元素含量及化合态。结果表明石墨烯的添加使锂基润滑脂的摩擦学性能得到的显著的提升,摩擦过程中,摩擦副表面形成了石墨烯的吸附膜和层积膜以及由FeO, Fe2O3, FeOOH和LiOH组成的反应膜,正是这些复合膜的综合作用,使得润滑脂的摩擦性能得到了进一步的提升。