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Energy Storage of Polyarylene Ether Nitriles at High Temperature
Xiaohe Tang,Yong You,Hua Mao,Kui Li,Renbo Wei,Xiaobo Liu 대한금속·재료학회 2018 ELECTRONIC MATERIALS LETTERS Vol.14 No.4
Polyarylene ether nitrile (PEN) was synthesized and used as film capacitors for energy storage at high temperature. Scanningelectron microscopy observation indicated that the films of PEN have pinholes at nanoscales which restricted the energystorage properties of the material. The pinhole shadowing effect through which the energy storage properties of PEN wereeffectively improved to be 2.3 J/cm3 was observed by using the overlapped film of PEN. The high glass transition temperature(Tg) of PEN was as high as 216 °C and PEN film showed stable dielectric constant, breakdown strength and energy storagedensity before the Tg. The PEN films will be a potential candidate as high performance electronic storage materials used athigh temperature.
Activation of persulfate by UV and Fe<sup>2+</sup> for the defluorination of perfluorooctanoic acid
Song, Zhou,Tang, Heqing,Wang, Nan,Wang, Xiaobo,Zhu, Lihua Techno-Press 2014 Advances in environmental research Vol.3 No.3
Efficient defluorination of perfluorooctanoic acid (PFOA) was achieved by integrating UV irradiation and $Fe^{2+}$ activation of persulfate ($S_2O{_8}^{2-}$). It was found that the UV-$Fe^{2+}$, $Fe^{2+}-S_2O{_8}^{2-}$, and UV-$S_2O{_8}^{2-}$ processes caused defluorination efficiency of 6.4%, 1.6% and 23.2% for PFOA at pH 5.0 within 5 h, respectively, but a combined system of UV-$Fe^{2+}-S_2O{_8}^{2-}$ dramatically promoted the defluorination efficiency up to 63.3%. The beneficial synergistic behavior between $Fe^{2+}-S_2O{_8}^{2-}$ and UV-$S_2O{_8}^{2-}$ was demonstrated to be dependent on $Fe^{2+}$ dosage, initial $S_2O{_8}^{2-}$ concentration, and solution pH. The decomposition of PFOA resulted in generation of shorter-chain perfluorinated carboxylic acids (PFCAs), formic acid and fluoride ions. The generated PFCAs intermediates could be further defluorinated by adding supplementary $Fe^{2+}$ and, $S_2O{_8}^{2-}$ and re-adjusting solution pH in later reaction stage. The much enhanced PFOA defluorination in the UV-$Fe^{2+}-S_2O{_8}^{2-}$ system was attributed to the fact that the simultaneous employment of UV light and $Fe^{2+}$ not only greatly enhanced the activation of $S_2O{_8}^{2-}$ to form strong oxidizing sulfate radicals ($SO{_4}^{\cdot-}$), but also provided an additional decarboxylation pathway caused by electron transfer from PFOA to in situ generated $Fe^{3+}$.
Zeeshan Nawaz,Tang Xiaoping,Xiaobo Wei,Fei Wei 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.5
To process the solid particulates in fluidized bed and slurry phase reactors, attrition is an inevitable consequence and is therefore one of the preliminary parameters for the catalyst design. In this paper, the mechanical degradation propensity of the zeolite catalysts (particles) was investigated in a bimodal distribution environment using a Gas Jet Attrition - ASTM standard fluidized bed test (D-5757). The experimentation was conducted in order to explore parameters affecting attrition phenomena in a bimodal fluidization. In a bimodal fluidization system, two different types of particles are co-fluidized isothermally. The air jet attrition index (AJI) showed distinct increases in the attrition rate of small particles in a bimodal fluidization environment under standard operating conditions, in comparison with single particle. A series of experiments were conducted using particles of various sizes, with large particles of different densities and sizes. Experimental results suggest that the relative density and particle size ratio have a significant influence on attrition behavior during co-fluidization. Therefore a generalized relationship has been drawn using Gwyn constants;those defined material properties of small particles. Moreover, distinct attrition incremental phenomenon was observed during co-fluidization owing to the change in collision pattern and impact, which was associated with relative particle density and size ratios.
Jieju Yue,Canming Tang,Yan Ren,Suijie Wu,Xiaobo Zhang,Huazhong Wang 한국유전학회 2014 Genes & Genomics Vol.36 No.4
Pollen development is disturbed in the microsporedevelopment stage of the double-recessive nuclearmale-sterile line ms5ms6 (Gossypium hirsutum L.). Thisstudy aimed to identify differentially expressed antherproteins and their potential roles in pollen development andmale sterility. We compared the proteomes of sterile andfertile anthers of the double recessive nuclear male-sterileline ms5ms6. Approximately 1,390 protein spots weredetected by two-dimensional differential gel electrophoresis. Proteins with altered accumulation levels in sterileanthers compared with fertile anthers were identified bymass spectrometry and the NCBInr and Viridiplantae ESTdatabases. Down-regulated proteins in the sterile anthersincluded cytosolic ascorbate peroxidase 1 and glutaminyltRNAsynthetase (glutamine-tRNA ligase). Several carbohydratemetabolism- and photosynthesis-related enzymeswere also present at lower levels in the mutant anthers. Bycontrast, ATP-dependent RNA helicase eIF4A-13, NADHdehydrogenase subunit 1, enolase, gibberellin 20-oxidase,gibberellin 3-hydroxylase 1, alcohol dehydrogenase 2d,3-ketoacyl-CoA synthase, and trehalose 6-phosphate synthasewere expressed at higher levels in sterile anthers thanin fertile anthers. The regulation of upland cotton pollendevelopment involves a complex network of differentiallyexpressed genes. This study provides the foundation forfuture investigations of gene function in upland cottonpollen development and male sterility.
3.2-kW 9.7-GHz Polarization-maintaining Narrow-linewidth All-fiber Amplifier
Hang Liu,Yujun Feng,Xiaobo Yang,Yao Wang,Hongming Yu,Jue Wang,Wanjing Peng,Yanshan Wang,Yinhong Sun,Yi Ma,Qingsong Gao,Chun Tang 한국광학회 2024 Current Optics and Photonics Vol.8 No.1
We present a Yb-doped narrow-linewidth polarization-maintaining (PM) all-fiber amplifier that achieves a high mode-instability (MI) threshold, high output power, and 9.7-GHz spectral linewidth. Six wavelength-multiplexed laser diodes are used to pump this amplifier. First, we construct a high-power fiber amplifier based on a master oscillator-power amplifier (MOPA) configuration for experiments. Subsequently, we examine the MI threshold by individually pumping the amplifier with wavelengths of 976, 974, 981, 974, and 981 nm respectively. The experimental results demonstrate that the amplifier exhibits a high MI threshold (>3.5 kW) when pumped with a combination of wavelengths at 974 and 981 nm. Afterward, we inject an optimized phase-modulated seed with a nearly flat-top spectrum into this amplifier. Ultimately, laser output of 3.2 kW and 9.7 GHz are obtained.
Modified Adaptive Gaussian Filter for Removal of Salt and Pepper Noise
( Zuoyong Li ),( Kezong Tang ),( Yong Cheng ),( Xiaobo Chen ),( Chongbo Zhou ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.8
Adaptive Gaussian filter (AGF) is a recently developed switching filter to remove salt and pepper noise. AGF first directly identifies pixels of gray levels 0 and 255 as noise pixels, and then only restored noise pixels using a Gaussian filter with adaptive variance based on the estimated noise density. AGF usually achieves better denoising effect in comparison with other filters. However, AGF still fails to obtain good denoising effect on images with noise-free pixels of gray levels 0 and 255, due to its severe false alarm in its noise detection stage. To alleviate this issue, a modified version of AGF is proposed in this paper. Specifically, the proposed filter first performs noise detection via an image block based noise density estimation and sequential noise density guided rectification on the noise detection result of AGF. Then, a modified Gaussian filter with adaptive variance and window size is used to restore the detected noise pixels. The proposed filter has been extensively evaluated on two representative grayscale images and the Berkeley image dataset BSDS300 with 300 images. Experimental results showed that the proposed filter achieved better denoising effect over the state-of-the-art filters, especially on images with noise-free pixels of gray levels 0 and 255.