GaN HFET沟道中的电子状态转移和非线性研究

从自洽求解薛定谔方程和泊松方程出发研究了大栅压摆动下的沟道电子状态,发现高栅压下电子波函数向势垒层的渗透和激发子带向势垒层的转移是导致跨导下降、线性变差的主要原因。分别研究了势垒层和沟道结构对波函数渗透和电子态转移的影响。通过势垒层和沟道结构的综合设计获得了在大栅压摆动下保持高跨导和线性的优化结构。提出了剪裁二维能带结构的新工艺方案。     

ZnO Hard Templating for Synthesis of Hierarchical Porous Carbons with Tailored Porosity and High Performance in Lithium‐Sulfur Battery

Hierarchical porous carbon (HPC, DUT‐106) with tailored pore structure is synthesized using a versatile approach based on ZnO nanoparticles avoiding limitations present in conventional silica hard templating approaches. The benefit of the process presented here is the removal of all pore building components by pyrolysis of the ZnO/carbon composite without any need for either toxic/reactive gases or purification of the as‐prepared hierarchical porous carbon. The carbothermal reduction process is accompanied by an advantageous growing of distinctive micropores within the thin carbon walls. The resulting materials show not only high internal porosity (total pore volume up to 3.9 cm³ g^?1) but also a large number of electrochemical reaction sites due to their remarkably high specific surface area (up to 3060 m² g^?1), which renders them particularly suitable for the application as sulfur host material. Applied in the lithium‐sulfur battery, the HPC/sulfur composite exhibits a capacity of >1200 mAh g^?1‐sulfur (>750 mAh g^?1 electrode) at a high sulfur loading of ≥ 3 mg cm^?2 as well as outstanding rate capability. In fact, this impressive performance is achieved even using a low amount of electrolyte (6.8 μl mg^?1 _sulfur) allowing for further weight reduction and maintenance of high energy density on cell level.     

AlGaN/GaN异质结构中的极化工程

从自洽求解薛定谔方程和泊松方程出发,研究了AlGaN/GaN量子阱电子气密度随Al组份比、势垒层厚度和栅压的变化,比较了能带带阶和极化电荷对沟道阱能带和电子气特性的影响,研究了在势垒层和缓冲层中夹入AlN及InGaN薄层的作用,计算了AlGaN/GaN/AlGaN双异质结的能带,最后探讨了势垒层能带的优化设计,提出了剪裁势垒层能带来钝化表面的新方法。     

视频质量增强模型加速算法

提出了一种应用于视频质量增强算法的动态结构性剪裁算法Maskcut,它可以有效提高基于深度学习的视频质量增强算法的运行速度。Maskcut是一种通用的剪裁思路,支持绝大多数的基于卷积神经网络(CNN)深度学习网络模型的剪裁加速。基于原模型中已经训练好的参数数据,Maskcut使用一种针对剪裁加速的二次训练策略来进一步微调参数,从而在保证模型有效性损失不大的同时,缩短模型运行时间。以一种先进的视频质量增强算法——多帧质量增强2.0(MFQE 2.0)为目标,Maskcut剪裁后可以快速达到峰值信噪比(PSNR)指标损失低于1%、时间缩短10%以上的加速指标。     

嵌入式Linux裁剪研究

阐述了嵌入式Linux要解决的问题，给出了嵌入式Linux的裁剪的方法及过程。     

Rational Design of Nanostructured Electrode Materials toward Multifunctional Supercapacitors

As an intermediate step during energy usage, supercapacitors with superior power density, long‐term cycling stability, and moderate energy density have attracted immense interest as a facile route to use energy in a clean, efficient, and versatile manner in smart grid applications, as well as portable devices and other applications. Currently, the major drawback of supercapacitors is the low energy density. Electrode materials are the key components determining the cell performance. Great research efforts are made to develop nanostructured electrode materials with high performance. On the other hand, integrating supercapacitors with other applications have led to the emergence of many new types of multifunctional supercapacitors, which are attractive for a myriad of applications. The current understanding on charge/discharge mechanisms of electric double layer capacitors and pseudo‐capacitors is discussed along with recent development in designing nanostructured electrode materials by structure/morphology engineering, doping, and crystal structure controlling. Achievements in multifunctional supercapacitors like flexible supercapacitors, all‐solid‐state supercapacitors, self‐healing supercapacitors, electrochromic supercapacitors, self‐chargeable supercapacitors, and supercapacitors integrated with sensors are illustrated. Finally, opportunities and challenges in developing high performance and multifunctional supercapacitors are proposed.     

NiTiO3纳米棒的制备及表征

结合溶胶-凝胶法和微乳液化学剪裁技术,以钛酸丁酯和N iC l2制备凝胶,在SDS/正丁醇/正庚烷/水形成的微乳液体系中,对凝胶进行化学剪裁并与KBH4反应,经500℃煅烧30 m in,制备出直径40~100 nm,长度150~700 nm,长径比为4~7的N iTiO3纳米棒。用XRD、ED、EDS、IR、TEM、TGA和DSC等方法对产物的组成、结构及纳米棒的形成过程进行了研究。实验表明,凝胶的陈化时间、煅烧温度和煅烧时间对纳米N iTiO3的组成、粒径和形貌均有影响。研究认为,前驱物不均匀地吸附有机物,导致煅烧过程中,颗粒在不同方向上以不同的速度生长,是N iTiO3纳米棒形成的原因。     

不同加载方式下硬质合金应力状态的有限元模拟研究

硬质合金中存在分布不均匀的残余热应力,在承载过程中残余热应力与外加载荷产生复杂的交互作用,影响材料的力学性能。现有的实验和模拟方法均为统计性分析方法,难以在微观组织尺度分析应力分布的细节和特征。本工作利用有限元模拟的方法研究了硬质合金的残余热应力分布特征,分析了不同载荷方式下硬质合金内的应力状态,研究了残余热应力和外加载荷之间的相互作用。基于应力分析,提出了提高硬质合金承载能力的组织结构设计方法和理论依据。该方法也可应用于其他多种多相复合材料的应力分析和微观组织优化。     

AlPO_4-5负载溴化铝催化酮的Baeyer-Villiger氧化反应

以异丙醇铝为铝源,正磷酸为磷源,三乙胺作模板剂,采用水热反应合成了AlPO4-5分子筛。应用不同浓度氢溴酸对AlPO4-5分子筛进行化学剪裁,制备AlPO4-5-AlBr3催化剂。FESEM、XRD、N2吸附-脱附等表征结果表明,合成的AlPO4-5是规整的微孔六方棱柱,化学剪裁制备的担载型催化剂AlPO4-5-AlBr3依然保持规整的六方棱柱。催化氧化实验表明,质量分数30%双氧水作为氧化剂,在乙酸乙酯溶剂中,催化剂AlPO4-5-AlBr3对部分环酮具有较好的催化活性。