Direct evidence for the electron–hole pair mechanism by studying the organic magneto-electroluminescence based on charge-transfer states

Organic magneto-electroluminescence (MEL) based on the charge-transfer (CT) states was investigated to clarify the electron-hole (e-h) pair mechanism for the organic magnetic field effects. The CT state is an ideal object because its emission is a direct intermolecular recombination process without forming intramolecular exciton. We found that the MEL of the CT states is not only greater than that of the exciton, but also exhibits almost no high-field decrease at low temperatures. Our results directly prove the e-h pair mechanism. Meanwhile, the transient electroluminescence measurements with and without magnetic fields confirm that magnetic field has no effect on the charge mobility but on the charge recombination process, implying the charge mobility-related mechanisms may be less dominant above the turn-on voltage.     

基于TD-SCDMA的嵌入式Internet接入平台设计

本文以C3220处理器为核心,利用CYIT的TD通信模块构建了一个嵌入式Internet接入平台,对其硬件构成及工作流程进行了讨论,描述了其软件层次结构,并详细讲解了基于该平台的通用通信接口（GCI）的实现,从而满足3G网络出现的各种新业务和新要求,比如MBMS多媒体业务、CMMB手机电视等等。本方案的实现使得嵌入式产品实施网络化更容易和更廉价,具有较强的实用价值及广泛的推广意义。     

Code Design for MIMO Broadcast Channels

Recent information-theoretic results show the optimality of dirty-paper coding (DPC) in achieving the full capacity region of the Gaussian multiple-input multiple-output (MIMO) broadcast channel (BC). This paper presents a DPC based code design for BCs. We consider the case in which there is an individual rate/signal-to-interference-plus-noise ratio (SINR) constraint for each user. For a fixed transmitter power, we choose the linear transmit precoding matrix such that the SINRs at users are uniformly maximized, thus ensuring the best bit-error rate performance. We start with Cover's simplest two-user Gaussian BC and present a coding scheme that operates 1.44 dB from the boundary of the capacity region at the rate of one bit per real sample (b/s) for each user. We then extend the coding strategy to a two-user MIMO Gaussian BC with two transmit antennas at the base-station and develop the first limit-approaching code design using nested turbo codes for DPC. At the rate of 1 b/s for each user, our design operates 1.48 dB from the capacity region boundary. We also consider the performance of our scheme over a slow fading BC. For two transmit antennas, simulation results indicate a performance loss of only 1.4 dB, 1.64 dB and 1.99 dB from the theoretical limit in terms of the total transmission power for the two, three and four user case, respectively.     

Transmission electron microscopy investigation of acicular ferrite precipitation in γ′-Fe4N nitride

Acicular-shaped crystals precipitate from γ'-Fe₄N nitride in an iron–nitrogen alloy and were identified by electron microdiffraction as α-ferrite. Acicular ferrite develops both the Nishiyama–Wassermann and the Kurdjumov–Sachs orientation relationships with γ'-Fe₄N nitride. These orientation relationships were discussed in terms of the symmetry theory. The driving force for acicular ferrite formation was related to the increasing nitrogen content of γ'-Fe₄N, in equilibrium with α-ferrite, with decreasing temperature. The passage from lamellar to acicular structure in Fe–N system was proposed.     

Thermal Diffusivity and Speed of Sound of Saturated Pentane from Light Scattering

Transport and thermodynamic properties of pentane are necessary for the design and verification of reactors in pentane isomerization and degradation processes. However, there are few experimental data of these properties, especially in the high-temperature region. In this work, the thermal diffusivity and the sound speed of pentane have measured by dynamic light scattering and Brillouin light scattering, respectively. Pentane has been investigated under saturated conditions over a wide temperature range, from about 300 K up to the liquid–vapor critical point. It is estimated that: the standard uncertainty of temperature is \(u(T) = 0.01\)  K for the hydrodynamic region and \(u(T) = 0.026\)  K for the critical region; the relative expanded uncertainty in the thermal diffusivity is \(U_\mathrm{r}(a) = 0.03\) and the relative expanded uncertainty in the speed of sound is \(U_\mathrm{r}(c_\mathrm{s}) = 0.005\) with a coverage factor of \(k = 2\) . The thermal diffusivity and the sound-speed experimental data are also represented as functions of temperature. Finally, the results are discussed in detail in comparison with literature results and various prediction methods.     

Study of protein adsorption on octacalcium phosphate surfaces by molecular dynamics simulations

This study numerically studies absorption of human serum albumin (HSA) and basic protein lysozyme (LSZ) on crystallographic planes of octacalcium phosphate (OCP), an essential bioactive calcium phosphate. The molecular simulations include constructing atomic structure of OCP crystallographic planes and representative segments of HSA and LSZ with three different initiate orientations respect to OCP planes. The simulation reveals the dynamic process of the protein absorption. The absorption behavior of proteins is quantified by the interaction energy between proteins and OCP planes and the strain energy of proteins in absorption. The results show that absorption interaction energy of basic LSZ is higher than that of acidic HSA, which indicates that LSZ is more favorable to adsorb onto OCP surface than HSA. The interaction energies change with the OCP crystallographic planes, the trend of changes for both proteins are similar, that is OCP (001) > OCP (111) > OCP (110) > OCP (100), which is corrected with surface energy variation of crystallographic planes. The strain energy strongly depends on the orientations of the proteins before absorption, but weakly depends on crystallographic planes. The simulation results provide useful significant information for predicting/designing interface between bioceramic materials and organic tissues as well as for understanding the mechanism of the osteoinductivity at an atomic level.     

生活垃圾分类直运模式探究

随着社会的不断发展,人们的生活水平也在不断提升,而生活中产生的垃圾也越来越多,对垃圾的运输成为当前社会考虑的重要内容.在提倡垃圾分类过程中,生活垃圾的直运模式成为当前的一种新型垃圾收运模式,该模式具有成本低、环保等特点,能够更好地满足城市垃圾分类的需求.本文了解了转运模式的现状和问题,说明垃圾直运模式的意义,提出生活垃圾直运模式策略,为生活垃圾分类直运模式的发展提供参考.     

蒸煮工艺对米饭蛋白质及氨基酸的影响

采用四种蒸煮工艺蒸煮米饭,研究不同的蒸煮工艺对米饭蛋白质及氨基酸的影响,确定基于蛋白类营养的最佳蒸煮工艺,为米饭的蛋白类物质的营养评价及新型烹饪工具的开发提供实验数据.结果表明,蒸煮工艺对米饭粗蛋白含量影响不大,对水溶性蛋白和游离氨基酸含量有显著影响;大米蒸煮后水溶性蛋白和游离氨基酸含量有不同程度的提高,采用较长时间低温(50～60℃,20～30 min)处理并以较高温度(110～12℃)蒸煮的工艺制作的米饭的水溶性蛋白和游离氨基酸含量最高.     

从精细电子印刷看网印制版技术进展

网版印刷模版简称网版,它是影响网版印刷质量的最重要的因素之一。对于高精度的网版印刷作业而言,高精度的网版就显得尤为关键,从这一个层面上讲,网版质量的好坏、     

Multicomposition analysis and pattern recognition of Chinese geographical indication product: vinegar

Multicomposition fingerprints with several chemical compositions containing inorganic elements and organic compounds (amino acids, polyhydric alcohols, organic acids) were measured to distinguish two geographical indication-protected vinegars (GIs) from general vinegars (nGIs). The two of GIs were named Shanxi extra aged vinegar and Zhenjiang vinegar from Shanxi and Jiangsu province, respectively. Principal component analysis and Fisher linear discriminant methods were applied for the pattern recognition and classification of GI product. It was not suitable by simply using one kind of composition to make a distinction between GIs and nGIs. However, by using multicomposition to build a classify model, the classification of SXVs was described by Co, As, Al, Mg, Ca, erythritol, arabitol, sorbitol, proline, lysine and pyruvic acid, while ZJVs classification was described by threonine, serine, glycine, lysine, Ba, erythritol, xylitol and lactic acid. The GI samples can be classified with high accuracy according to the discriminant model, of which the false rate is 3.88 % in SXVs model and 10.85 % in ZJVs model. This method can be a useful method for protecting the geographical indication vinegars from the fake or adulterate vinegar commodities.