栈桥框架结构梁的破坏原因分析

就某煤矿栈桥框架结构梁的破坏进行了深入分析,并针对其中可能产生破坏的两个主要因素建立起相应的力学模型,分别进行计算分析,求得各自可产生的作用。最后,通过进行比较,得出梁破坏的真正原因。从而为栈桥的修复提供了可靠的力学依据,并且可供类似工程参考。     

电感耦合等离子体原子发射光谱(ICP-AES)法测定硒片中的硒、铁、钙和锌

用HNO_3-HClO_4(4∶1)溶解硒片,电感耦合等离子体原子发射光谱(ICP-AES)法测定其中的硒、铁、钙和锌,实验表明硒片中硒、铁、钙和锌的含量较为丰富,与外包装承诺的含量一致。方法灵敏可靠,测量相对标准偏差3%,加标回收率在96.5%~101%,实验结果为探讨硒片对人体的保健作用提供了参考数据。     

Adaptive coupled synchronization of non-autonomous systems in ring networks

The adaptive coupled synchronization method for non-autonomous systems is proposed. This method can avoid estimating the value of coupling coefficient. Under the uniform Lipschitz assumption, we derive the asymptotical synchronization for a general coupling ring network with N identical non-autonomous systems~ even when N is large enough. Strict theoretical proofs are given. Numerical simulations illustrate the effectiveness of the present method.     

民族地区旅游型小城镇规划刍议——以甘肃省东乡族自治县河滩镇为例

小城镇作为民族地区旅游业发展的重要载体,发展旅游业是很多民族地区小城镇实现跨越发展的必然选择.以东乡族自治县河滩镇为例,探讨了民族地区旅游型小城镇规划的编制理念和策略,主要讨论在民族地区小城镇总体规划中利用小城镇资源优势,完善旅游功能的手段和方法.     

师法自然

大自然有着许多自己的法则,这些法则充满智慧,亘古不变。大自然,她坦荡阔大,淡定从容。无论沧海桑田如何激变,星移斗转如何迷离,却永远有风花雪月四季的流转如歌的行板。     

Signatures of strong interlayer coupling in γ-InSe revealed by local differential conductivity

Interlayer coupling in layered semiconductors can significantly affect their optoelectronic properties. However, understanding the mechanisms behind the interlayer coupling at the atomic level is not straightforward. Here, we study modulations of the electronic structure induced by the interlayer coupling in the γ-phase of indium selenide (γ-InSe) using scanning probe techniques. We observe a strong dependence of the energy gap on the sample thickness and a small effective mass along the stacking direction, which are attributed to strong interlayer coupling. In addition, the moiré patterns observed in γ-InSe display a small band-gap variation and nearly constant local differential conductivity along the patterns. This suggests that modulation of the electronic structure induced by the moiré potential is smeared out, indicating the presence of a significant interlayer coupling. Our theoretical calculations confirm that the interlayer coupling in γ-InSe is not only of the van der Waals origin, but also exhibits some degree of hybridization between the layers. Strong interlayer coupling might play an important role in the performance of γ-InSe-based devices.     

关于实习教学中素质教育的探讨

文章阐述了在实习教学过程中进行素质教育的优势，素质教育的主要内容，以及如何在实习教学过程中循序渐进、潜移默化地实施素质教育的一些方法和措施。     

Impulsive synchronization and control of directed transport in chaotic ratchets

The impulsive synchronization problem of two identical chaotic ratchets is investigated in this paper. We demonstrate that the impulsive method to control directed transport is applicable when there are multiple co-existing attractors in phase space transporting particles in different directions. Numerical simulations are carried out to illustrate the effectiveness of the proposed method.