合肥近地面折射率结构常数C_n~2分布特征及分析

本文通过对合肥郊区中科院安光所气象观测场1995年1～3月近地面层折射率结构常数C2n的统计分析，得到了C2n的日变化特征、概率分布等，同时对C2n和近地面气象要素的关系作了讨论。     

用火花电阻计算高压毫微秒脉冲放电参量

本文用火花电阻公式研究了高压毫微秒脉冲参量（脉冲幅值、前沿、宽度）与储能电容的关系。结果表明，用火花电阻等效亚纳秒脉冲放电管击穿后的状态是合适的。     

湍流两相流内弹道模型

采用双流体两相流模型,推导有粘的两相流内弹道基本方程,并且建立了两相相互作用的气固两相湍流数学模型。     

一种新型发射技术-冲压加速原理

介绍一种新型发射技术──冲压加速原理，它在仅仅利用化学能的条件下，可将弹丸加速到超过２ｋｍ／ｓ的非常规初速，加速效率很高，弹迫效率可高达３０％，是一种很有发展前途的超高速发射技术。     

大口径尾翼稳定脱壳穿甲弹全弹道优化设计

研究了应用现代最优化理论对弹炮系统进行多目标优化设计的基本方法和步骤。选用了约束变尺度法对高膛压滑炮配备尾翼稳定脱壳穿甲弹的装药结构和弹形结构参数进行多目标优化设计，得出了较满意的结果。     

弧厚不均火药在内弹道计算中的处理方法

根据所用粒状药内外弧厚不同的特点，推导了该粒状药二项式与三项式的形状函数，并进行了比较，建立了粒状药与管状药组成的混合装药的多相流内弹道理论模型，编制工程实用的软件系统，数值预报射击过程膛内物理量变化的详细结果，该研究结果对于指导装药设计，弹丸设计与身管设计都具有重要的理论参考价值与工程实际意义。     

K-band MMIC active band-pass filters

Two K-band active band-pass filters using 0.15-/spl mu/m GaAs pHEMT technology, with one fixed-frequency and the other tunable, are designed, fabricated, and tested. The fixed-frequency filter has its central frequency at 22.6 GHz, with 900-MHz bandwidth (4%). The tunable filter can be tuned from 19.5 to 21.5 GHz with the same bandwidth. Both circuits have a common size of 1 mm /spl times/ 1 mm. To our knowledge, the tunable filter is the highest frequency tunable active filter ever reported.     

对“相关原则”应用实例的分析

本文对“相关原则”中的最大实体原则(MMP)进行了分析,根据分析对GB1183—80中的有关内容提出了修改意见.     

嵌入式系统中USB总线的应用

详细阐述了一种用于嵌入式系统中的USB总线接口电路,该电路是基于USB专用芯片CH375实现的,并给出了系统硬件实现和应用程序。实验结果表明,该电路具有成本低、可靠性高等特点,可方便地集成到各种嵌入式系统中。     

Biomimetic Lamellar Chitosan Scaffold for Soft Gingival Tissue Regeneration

Mucogingival surgery has become a common procedure for soft gingival tissue reparation in dental clinical practice, which mainly relies on autograft or commercial collagen membranes (CM). However, the autograft faces grand challenges in source availability and long-term post-surgery pain management, and the CM is restricted by its poor mechanical properties in an aqueous environment. Here, it is reported that a bio-inspired lamellar chitosan scaffold (LCS) with long range ordered porous structure, manufactured through a bidirectional freezing method, can serve as a promising gingival tissue engineering material. The LCS not only exhibits excellent mechanical properties in the hydrated state but also accelerates vessel formation and soft tissue regeneration in vivo. Most interestingly, the LCS is found to be capable of inducing macrophage differentiation to M2 macrophages, which is thought to play an important role in tissue regeneration. These advantages combined with its easy and low-cost preparation process make the LCS a promising candidate for dental clinical applications.