Efficient,Selective, and Reversible SO2 Capture with Highly Crosslinked Ionic Microgels via a Selective Swelling Mechanism

SO₂ capture through physisorption is a promising environmental benign technology to eliminate the emission of SO₂. However, designing an efficient adsorption material with high capacity and selectivity of SO₂ as well as excellent reversibility remains challenging. Here, a class of highly crosslinked nonporous poly(ionic liquid)s (PILs) xerogels is prepared with high ionic density by photopolymerization of Gemini IL monomers and a microfluidic technology is further explored to prepare the corresponding monodisperse PIL microgels with uniform and controllable sizes at the diameter range from 43 to 250 µm. This kind of novel dense nonporous ionic xerogels/microgels completely exclude the adsorption of common gases (CO₂, CH₄, etc.), but exhibit very high SO₂ adsorption capacity (498 mg g^?1) via selective swelling mechanism. Unprecedented SO₂/CO₂ and SO₂/CH₄ uptake selectivities with the value up to 614 and 1992, respectively, are achieved. The selective swelling mechanism is validated by optical microscope and differential scanning calorimetry measurements. More importantly, these kinds of xerogels show excellent reversibility in adsorption–desorption cycles. Column breakthrough experiments confirm the excellent performance of these PIL xerogels in SO₂ capture. This work demonstrates that designing a nonporous material that has specific swelling interactions with certain molecules can be an effective strategy for realizing extremely high selectivity.     

中波发射台自动化监控系统的实践和完善

为了加快推动发射台管理模式现代化的进程．2004年国家广电总局科技委会议明确提出,加大发射台自动化监控程序．以先进的科学技术完善发射台的管理,代替以往的“人管机器”的管理模式,以先进的监测设备为基础,科学的管理理念为平台,有效地提高发射台安全播出的成功率。随着广电总局关于发射台自动化改造精神的进一步落实．发射台自动播出监测技术的运用已成为台站管理的发展方向。本文通过详细介绍肇庆中波转播台的播出自动化监控系统,探讨了利用先进的计算机控制和科学的管理模式实现对中波发射机的自动控制,     

基于ARM9的嵌入式WEB服务器的研究与设计

详细分析了嵌入式Web服务器在网络应用方面的前景,深入研究了嵌入式Web服务器的原理,并给出了基于ARM9的嵌入式Web服务器的设计方法及关键技术的实现。     

Speech enhancement using harmonics regeneration based on multiband excitation

This paper proposes an algorithm that adopts the harmonic regeneration as post-processing to improve the performance of speech enhancement using traditional Short Time Spectral Amplitude (STSA). The proposed algorithm aims to alleviate the distortion of the high harmonics of enhanced speech via the traditional STSA, and consequently improves the speech quality. We first detect the pitch, or fundamental frequency, of the enhanced speech via the traditional STSA, and then, divide the whole spectrum into multiple sub-bands which center on each harmonic. After that, a series of specially designed windows centered on each harmonic are applied to all the sub-bands, in order to redistribute the energy in the sub-bands. The results of experiment demonstrate that the method has both theoretical and practical basis.     

REPAIR: fragile watermarking for encrypted speech authentication with recovery ability

Telecommunication Systems - Confidentiality and integrity are fundamental requirements when transmitting and storing data. In order to guarantee the confidentiality and integrity of speech signal,...     

Effects of disorder on charge transport in semico++ nducting polymers

Polaron transport process in semiconducting polymers with disordered structure and morphology is simulated using a nonadiabatic evolution method. The simulations are performed within the framework of an extended version of the Su–Schrieffer–Heeger model modified to include diagonal disorder, off-diagonal disorder and an external electric field. It is found that the polaron transport mechanism is determined by the competition between the disorder and the electric field. For the case of pure diagonal disorder, the polaron transport undergoes a crossover from adiabatic drift to nonadiabatic hopping under a large scope of electric field (E < 2.0 mV/Å), whereas the field-assisted tunneling dominates charge transport for a higher electric field. For the combined disorder, it is demonstrated that the competition effects and the synergetic effects between the diagonal and off-diagonal disorder are equally important. The effects of diagonal disorder are negative in most cases, and the energetically easier pathways for charge transport are mainly opened by the off-diagonal disorder.     

信息时代校园文化视域下武术文化的传承与发展

随着时代的发展,武术在高校得以广泛发展,并越来越受到大学生的喜爱,大学生日渐增强了对武术文化内涵的认同感。本文通过采用文献资料法、逻辑分析法、专家访谈法等研究方法,在分析武术文化特点的基础上,结合武术在当今高校的开展和大学生教育特点,深入探讨武术文化在高校教育中的功能和价值,为武术文化在高校的发展提供理论依据,并提出相应的发展策略。     

GPSMAP 276C手持GPS在地震勘探中的应用

随着石油物探技术的不断发展,手持GPS因其轻便、灵活、功能强大等特点在地震勘探中得到越来越广泛的应用.本文在介绍了手持GPS的地图功能、偏移功能、陆海导航功能及坐标转换的基础上,以沙特阿拉伯工区为例,简要论述了GPSMAP 276C在地震勘探行业尤其是海洋石油勘探中的应用.     

我国高岭土行业的发展前景

我国高岭土行业与先进国家比有一定差距，特别是优质高岭土储量及产量都很低，供需矛盾很大。但在硬质高岭土的开发利用方面，已取得十分可喜的成就。文中以充分的论据阐述了我国高岭土行业具有广阔的发展前景。     

Calculation and evaluation of narcissus for diffractive surfaces in infrared systems

In infrared optical systems, the narcissus effect for diffractive surfaces should be calculated with specific diffraction orders based on the diffraction efficiency. It is shown in this work that the diffraction order of maximum diffraction efficiency varies with the change of the incident angle and wavelength of the backward-traced narcissus flux. Meanwhile, yni, which is the paraxial evaluation criterion of narcissus intensity for a refractive surface, is modified considering diffraction when a ray passes through diffractive surfaces, and a practical example has been given. The analysis can be used to calculate and control the narcissus intensity in infrared optical systems with diffractive surfaces.