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71.
72.
Ke Wu Zhe Li Jibo Tang Xianglong Lv Hailing Wang Ruichun Luo Pan Liu Lihua Qian Shunping Zhang Songliu Yuan 《Nano Research》2018,11(8):4123-4132
Photoluminescence (PL) of transition metal dichalcogenides (TMDs) can be engineered by controlling the density of defects, which provide active sites for electron-hole recombination, either radiatively or non-radiatively. However, the implantation of defects by external stimulation, such as uniaxial tension and irradiation, tends to introduce local damages or structural non-homogeneity, which greatly degrades their luminescence properties and impede their applicability in constructing optoelectronic devices. In this paper, we present a strategy to introduce a controllable level of defects into the MoS2 monolayers by adding a hydrogen flow during the chemical vapor deposition, without sacrificing their luminescence characteristics. The density of the defect is controlled directly by the concentration of hydrogen. For an appropriate hydrogen flux, the monolayer MoS2 sheets have three times stronger PL emission at the excitonic transitions, compared with those samples with nearly perfect crystalline structure. The defect-bounded exciton transitions at lower energies arising in the defective samples and are maximized when the total PL is the strongest. However, the B exciton, exhibits a monotonic decline as the defect density increases. The Raman spectra of the defective MoS2 reveal a redshift (blueshift) of the in-plane (out-of-plane) vibration modes as the hydrogen flux increases. All the evidence indicates that the generated defects are in the form of sulfur vacancies. This study renders the high-throughput synthesis of defective MoS2 possible for catalysis or light emitting applications. 相似文献
73.
Molecular dynamic model of nanofluid between flat plates under shear flow conditions was built. The nanofluid model consisted
of 12 spherical copper nanoparticles with each particle diameter of 4 nm and argon atoms as base liquid. The Lennard–Jones
(LJ) potential function was adopted to deal with the interactions between atoms. Thus, the motion states of nanoparticles
during the process of flowing were obtained and the flow behaviors of nanofluid between flat plates at different moments could
be analyzed. The simulation results showed that an absorption layer of argon atoms existed surrounding each nanoparticle and
would accompany with the particle to move. The absorption layer contributed little to the flow of nanoparticles but much to
the heat transferring in nanofluids. Another phenomenon observed during shear flowing process was that the nanoparticles would
vibrate and rotate besides main flowing with liquid argon and these micro-motions could strengthen partial flowing in nanofluids. 相似文献
74.
Radio frequency identification (RFID) systems suffer many security risks because they use an insecure wireless communication
channel between tag and reader. In this paper, we analyze two recently proposed RFID authentication protocols. Both protocols
are vulnerable to tag information leakage and untraceability attacks. For the attack on the first protocol, the adversary
only needs to eavesdrop on the messages between reader and tag, and then perform an XOR operation. To attack the second protocol
successfully, the adversary may execute a series of carefully designed challenges to determine the tag’s identification. 相似文献
75.
本文介绍了公交优先策略的概念和分类,阐述了绿灯延长、绿灯提前、相位倒转、相位插入、公交通行专用相位等主动优先控制策略的基本原理,并对其进行了适应性和优缺点分析。 相似文献
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78.
为有效控制污水处理设施的恶臭污染问题,设计了一种废气处理装置的监控系统;下位机采用西门子S7-300PLC,运用STEP7编程软件编制了现场PLC控制程序;上位机选用工控机,采用WinCC组态软件对上位机监控功能进行组态,实现现场数据实时记录和监控,并利用WinCC全局脚本开发了模糊自适应PID控制算法,实现了对生物滴滤池循环水pH值的模糊自适应PID控制;实际应用结果表明,该控制系统响应速度快、超调量小,大大改善了pH中和过程的控制效果. 相似文献
79.
信任模型是整个网络安全体系的基础,决定了在网络上采用信任的形式与采用该形式带来的信任风险,并提供了建立和管理信任关系的框架。可见,对于信任模型的研究在网络安全中非常重要。文章着重分析了基于PKI的各类信任模型的信任机制、认证过程及其存在优缺点,指出了各类信任模型对网络信息安全产生影响的主要原因。通过总结与对比,指出了PKI信任模型的设计策略与发展趋势。 相似文献
80.
A neural network approach is presented for solving mathematical programs with equilibrium constraints (MPEC). The proposed neural network is proved to be Lyapunov stable and capable of generating approximal optimal solution to the MPEC problem. The asymptotic properties of the neural network are analyzed and the condition for asymptotic stability, solution feasibility and solution optimality are derived and the transient behavior of the neural network is simulated and the validity of the network is verified with numerical examples. 相似文献