142 research outputs found
Stopped-Flow Kinetic Investigation of Manganese-based Chemiluminescence Oxidation Reactions
No full textIn order to better understand the mechanism of solution manganese-based chemilumines-cence, the kinetics of a number of chemiluminescent oxidations by manganese species were studied using stopped-flow spectrophotometry. Both the kinetics of the decay of the oxi-dant and the chemiluminescence emission were followed for oxidations by permanganate, manganese dioxide sol and Mn3+(aq) of a range of organic compounds.
The most detailed studies were carried out on the oxidation of the relatively simple compounds including glyoxylic acid and glyoxal under pseudo first order conditions and an acidic medium at 25oC. For permanganate under these conditions, the decay is sigmoidal consistent with autocatalysis and for managanese dioxide sol and Mn3+ pseudo first order. Simple mechanisms are suggested and compared with the experimental kinetic data. For per-manganate CL system, the following chemical kinetic model was considered:
MnO4- + xsR MnO2 (k1)
MnO2 + xsR Mn3+ (k2)
MnO4- + 3Mn3+ 4MnO2 (k3)
Mn3+ + xsR (Mn2+)
Class Origin, Family Culture, and Intergenerational Correlation of Education in Rural China
No full textThis paper examines the intergenerational correlation of education in rural China. The focus is on the influence of family class origin (jiating chengfen), the political label hung on every family throughout the Maoist era. A nationally representative cross-sectional household survey for 2002 is used. It is shown that the effects of family class origin on family members' educational attainment varies across historical periods. Regarding the educational level of male heads of household with landlord/rich peasant background, we found a drop caused by the class-based discrimination in the Maoist era and a rebound in the postreform era. It was also found that family class origin remains significant for the educational achievement of the current younger generation. Children aged 16-18 who are of landlord/rich peasant and middle peasant origins are more likely to achieve higher educational attainment. We conclude that a class-specific, education-oriented family culture has been shaped first as a mixture of family cultural capital inherited from the pre-Maoist era and surfacing again in the postreform era, and, second, as intergenerational cultural reaction against class-based discrimination during the Maoist era.education, intergenerational correlation, class origin, family culture, social discrimination
偏振透雾成像系统的设计与实验分析
No full textIn view of the requirement of image quality, integration level and real;time application of the imaging systems under fog weather, this paper reports a polarization imaging system with a dehazing ability. The differential signal is converted by FPGA, and a highly integrated CMOS imaging circuit is built based on the internal PLL of the image sensor and the CamLink protocol. The obtained image is inversed by stokes equations, and the real;time dehazing algorithm is realized by the built;in DSP module. The total size of the polarization imaging system is 117 mm×117 mm×126 mm, and the weight of the system is 1.2 kg. An imaging experiment was made under fog weather, and the dehazing ability of the imaging system is proved by the contrast of the original image and the dehazed image's histogram and RGB distribution. Experimental results show that the imaging system can stably obtain a color dehazed image at 2 048×2 048 @ 180 Hz. © 2016, Science Press. All right reserved
Peratophyga bifasciata Warren 1905
No full textPeratophyga bifasciata Warren, 1905 Figs. 13–15, 25, 32, 39 Peratophyga bifasciata Warren, 1905, Novit. zool., 12: 13. Holotype 3, China: Hainan, Cheng Mai (BMNH). Diagnosis. The diagnostic characters are given under the previous species. Material examined. CHINA: Hainan (BMNH): 1 Ƌ (holotype), Cheng-Mai, VIII. 1902, Rothschild Bequest, B.M. 1939 - 1, BMNH (E)# 1008409. Hainan (IZCAS): 1 Ƥ, Baisha, Yinggezui, 611 m, 6–7.V. 2009, coll. Yan Keji; 1 Ƌ 3 Ƥ, Baisha, Hongkan Shuiku, 553 m, 3–5.V. 2009, coll. Chen Fuqiang and Yan Keji; 2 Ƌ, Baisha, Yuanmen, Hongkan Shuiku, 531 m, 23–25.XI. 2009, coll. Yang Chao; 1 Ƥ, Wanning, 60 m, 21.V. 1963, coll. Zhang Baolin; 1 Ƌ, Wuzhishan, Shuiman, 730–900 m, 9.V. 2007, coll. Han Hongxiang; 1 Ƥ, Jianfengling, 31.V. 1984, coll. Gu Maobin. Guangxi (IZCAS): 1 Ƌ, Wuzhou, Hebin, 8.VI. 1989, coll. Yang Shenping; 1 Ƥ, Luchuan, Wenquan, Zhongxing, 198 m, 10.IV. 2011, coll. Yang Xiushuai. Yunnan (IZCAS): 1 Ƌ, Xishuangbanna, Bubang, 700 m, 14.IX. 1993, coll. Xu Huanli. Distribution. China (Hainan, Guangxi, Yunnan).Published as part of Jiang, Nan, Xue, Dayong & Han, Hongxiang, 2012, A review of Peratophyga Warren, 1894 in China, with descriptions of two new species (Lepidoptera: Geometridae, Ennominae), pp. 403-415 in Zootaxa 3478 on pages 412-413, DOI: 10.5281/zenodo.28229
Tridrepana fulvata subsp. brevis Watson 1957
No full textTridrepana fulvata brevis Watson, 1957 Figs 1–4, 59, 83, 106–107, 130 Tridrepana fulvata brevis Watson, 1957, Bull. Br. Mus. nat. Hist. (Ent.), 4, 423, figs 4–6, 9. Holotype ♂, India: Assam: Khasis. (BMNH) Tridrepana emina Chu & Wang, 1988, Acta Entom. Sinica, 31 (2), 205. (part) Diagnosis. This subspecies is different from the nominate subspecies in that: both forks of the male uncus bend outwards; the valva is shorter and not reaching the apex of the uncus as in T. fulvata fulvata; the eighth sternite is not deeply concave as in T. fulvata fulvata; in the female genitalia, the dorsal lobe of the ostial segment is broader than that of T. fulvata fulvata. Material examined. INDIA, Assam: Khasis, IX.1896, 1♂ (Holotype), 1♀ (Allotype) (BMNH, photographs examined). CHINA, Shanghai: no data, 1♂ (IZCAS). Fujian: Mt. Wuyi, 21. V.1983, coll. Wang Linyao, 1♂; Mt. Wuyi, 14. V.1983, coll. Wang Linyao, 1♀ (Allotype of T. emina); Zhangzhou, V.1980, coll. Huang Bangkan, 1♂; Nanjing, Huboliao, Xiangxi, 195 m, 22–24.XI.2008, coll. Chen Fuqiang, 8♂ (IZCAS). Hainan: Baoting, 80 m, 24. V.1973, coll. Chen Yixin, 1♂ (Paratype of T. emina); Baoting, 80 m, 23–24. V.1973, coll. Chen Yixin, 2♂; Touyuan, Hougang, Hongshulin, 1 m, 23–24. V.2009, coll. Chen Fuqiang & Yan Keji, 3♂ 1♀; Qiongzhong, Limuling, 620 m, 15. V.2007, coll. Lang Songyun, 1♂; Lingshui, Diaoluoshan, 929 m, 11–12.XII.2007, coll. Li Jing, 1♂; Ledong, Jianfengling, 934 m, 14–17.XII.2007, coll. Li Jing, 1♂; Ledong, Jianfengling, 828 m, 26–27.III.2008, coll. Lang Songyun, 2♂; Ledong, Jianfengling, Tianchi, 982 m, 23–26.XI.2008, coll. Li Jing, 6♂; Ledong, Jianfengling, Yulingu, 746 m, 19. V.2009, coll. Yan Keji, 1♂; Ledong, Jianfengling, Tianchi, 828 m, 20. V.2009, coll. Yan Keji, 1♂; Ledong, Jianfengling, Mingfenggu, 983 m, 6.XII.2009, coll. Yang Chao, 1♂ (IZCAS). Yunnan: Xishuangbanna, Bubang, 700 m, 14.IX.1993, coll. Cheng Xinyue, 4♂ (IZCAS). Distribution. China (Shanghai, Fujian, Guangdong, Hainan, Hong Kong, Yunnan), India, Myanmar.Published as part of Song, Wenhui, Xue, Dayong & Han, Hongxiang, 2011, A taxonomic revision of Tridrepana Swinhoe, 1895 in China, with descriptions of three new species (Lepidoptera, Drepanidae), pp. 39-62 in Zootaxa 3021 on pages 42-4
MBSE modeling and reliability evaluation method for complex System
No full textTo solve the problem of lack of early reliability evaluation in complex System design process, a MBSE (model-based System engineering) method was proposed to support the design and reliability evaluation of complex Systems. With the characteristics of complex System developmenl, a MBSE modeling method based on MOFLP-R(mission, Operation, function, logic, physics and reliability) was proposed to support design and reliability assessment of complex System. KARMA, a System modeling language based on COPPRR (graph, object, property, point,relationship and role), was used to express the MOFLP-R process. Then, in order to evaluate the reliability of the complex System, the code generation was used to map the diagram to the numerical model. Finally, the method was applied to a hydraulic System case and the results showed lhat the proposed method is elfeclive for complex System design and evaluation.EPF
Novel Efficient HEVC Decoding Solution on General-Purpose Processors
No full textAlthough the emerging video coding standard High Efficiency Video Coding (HEVC) successfully doubles the compression efficiency of H. 264/AVC, its growing computational complexity makes real-time decoding of high-definition HEVC videos a very challenging issue for the existing personal computers and mobile devices. In this paper, a systematical, efficient HEVC decoding solution on general processors is provided, consisting of structure-level, data-level, and task-level approaches. First, a redesigned overall structure of a HEVC decoder with data redundancy reduction mechanism is introduced, which cuts down basic data operation cost and achieves an average decoding speedup of compared to the HM 10.0 decoder. On this basis, novel single-instruction multiple-data (SIMD) algorithms such as low-complexity motion compensation, transpose-free transform, symmetric deblocking filter, and parallel-index sample adaptive offset are developed, which further parallelize the data operations of each decoding task and bring another decoding speedup. Finally, a frame-based task-level parallel framework is employed with a flexible entry scheme to efficiently support the simultaneous processing of multiple decoding tasks for different HEVC parallel strategies. The overall solution achieves decoding fps of 40-75 for 4k HEVC videos on the Intel i7-2600 3.4 GHz quad-core processor (4-thread decoding) and 35-55 for 720p videos on the ARM Cortex-A9 1.2 GHz duo-core processor (2-thread decoding). This proposal is the recommended cross-platform HEVC decoding solution of Intel, AMD, and Cisco, and has provided HEVC service to over 1500 million people in China via the Xunlei Kankan video client.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000344720300010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701Computer Science, Information SystemsComputer Science, Software EngineeringTelecommunicationsSCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]
Erratum: Novel efficient HEVC decoding solution on general-purpose processors (IEEE Transactions on Multimedia (2014) 16:7 (1915-1928))
No full texthttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000348210500010&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701SCI(E)[email protected]; [email protected]; [email protected]; [email protected]; [email protected]
SWI/SNF-mediated chromatin remodeling induces Z-DNA formation on a nucleosome
No full textAbstract Background Z-DNA is a higher-energy, left-handed form of the double helix. A primary function of Z-DNA formation is to facilitate transcriptional initiation and activation. Sequences favoring Z-DNA formation are frequently located in promoter regions and Z-DNA is stabilized by torsional strain resulting from negative supercoiling, such as that generated by an actively transcribing polymerase or by a nucleosome remodeling event. We previously have shown that activation of the CSF1 gene by a chromatin remodeling event in the promoter results in Z-DNA formation at TG repeats within the promoter. Results We show that remodeling of a mononucleosome by the human SWI/SNF complex results in Z-DNA formation when the DNA within the mononucleosome contains Z-DNA favoring sequence. Nuclease accessibility patterns of nucleosome core particle consisting of Z-DNA are quite different from counterpart nucleosomes containing classic B-DNA. Z-nucleosomes represent a novel mononucleosome structure. Conclusions We present evidence that Z-DNA can form on nucleosomes though previous observations indicate the occlusion of nucleosome formation from Z-DNA.</p
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