349,555 research outputs found
Mechanisms for surface potential decay on fluorinated epoxy in high voltage DC applications
Full text linkEpoxy resin has been extensively used for decades as an insulation material in high voltage transmission systems. However, this insulation material does suffer from bulk and surface charging when used as insulating spacer, mainly in high voltage DC applications. By applying fluorination treatment, the surface of polymeric insulation is chemically treated and so modifies charge transport characteristics of the material. In doing so, excellent surface properties can be obtained without compromising the bulk characteristics of the polymeric insulation. In this paper, the authors investigate the surface potential decay performance of non-fluorinated and fluorinated epoxy resin samples. The surface decay performance of insulating material is a crucial parameter in dissipating accumulation of surface and bulk charge that can lead to premature breakdown of the insulating material. The epoxy samples were characterised by Energy Dispersive X-Ray (EDX) analysis to determine the changes in chemical composition of the samples before and after fluorination treatment. Surface potential decay measurement using positive corona discharging was then performed, followed by bulk DC conductivity measurement to further explain the mechanisms which govern the surface potential decay. The existence of surface-fluorinated layer on the treated samples had been found to play a major role in dictating the movement of charges away from the surface during the decay process. The influence of fluorination treatment on the decay mechanisms was discussed
Astragalus wui M. Idrees & Z. Y. Zhang 2021, nom. nov.
No full textAstragalus wui M. Idrees & Z.Y. Zhang, nom. nov. Replaced name:— Astragalus sylvaticus Y.H. Wu (2015: 718), nom. illeg., non A. sylvaticus (Pall.) Willd. (1802: 1300). Type:— CHINA. Xinjiang: Yecheng Country, Sukepiya, in border forest, alt. 3000 m, 15 Aug. 1987, Exped. Qinghai-Tibet Wu Yuhu 1067 (holotype: QTPMB, not seen). Etymology:—The specific epithet honours Prof. Dr. Wu Yuhu (Northwest Institute of Plateau Biology, Chinese Academy of Science, Xining, China), author of the replaced name, who first described this new species.Published as part of Idrees, Muhammad & Zhang, Zhiyong, 2021, Astragalus wui, a new replacement name for A. sylvaticus Y. H. Wu (Galegeae, Papilionoideae, Fabaceae), pp. 210-211 in Phytotaxa 524 (3) on page 210, DOI: 10.11646/phytotaxa.524.3.6, http://zenodo.org/record/564936
Observational data in 8 representative cities of Central-Eastern China
No full textArchived here are the input data for MIR calculation in 8 representative cities of Central-Eastern China in the paper: Zhang, Y., Xue, L., Mu, J., Chen, T., Li, H., Gao, J., and Wang W.: Developing the maximum incremental reactivity for volatile organic compounds in major cities of Central-Eastern China, Journal of Geophysical Research, in review, 202
Fistulatus Zhang, Zhang & Chen
No full textGenus Fistulatus Zhang, Zhang & Chen Type species: Fistulatus sinensis Zhang, Zhang & Chen, 1997: 237 Fistulatus Zhang, Zhang & Chen, 1997; Cen & Cai, 2002: 117 –119; Shang & Zhang, 2003: 21; Shang et al., 2006: 152 Diagnosis. Crown about as broad as pronotum; length shorter than half distance between eyes and slightly longer medially than next to eyes. Crown transversely depressed subapically with few transverse striations on anterior margin. Ocelli marginal, near corresponding eyes. Face broader than long; antenna longer than half body length, located at anterodorsal corner of eye; antennal pit deep and encroaching onto frontoclypeus; frontoclypeus narrow with median area slightly swollen; anteclypeus narrowed medially, expanded apically; lora large; genal sides nearly straight below eye. Pronotum with sides fairly short; transversely striate. Scutellum about same length as pronotum. Forewing with four apical cells and three subapical cells, first subapical cell open. Forefemur with single AV 1 seta, intercalary row with about 9 ~ 11 setae, subapical AM 1 present, stout, but the anterior ventral margin bearing 3 ~ 4 stout setae. Foretibia dorsal seta formula 1 + 4; hind femur apical spines 2 + 2 + 1. Pygofer with one or two lateral processes. Valve approximately rectangular. Connective with stem very short, Y-shaped with arms converging apically. Aedeagus large with basal part (socle) narrow; basal apodeme elongate; shaft tubular and elongate with paired processes or flanges, gonopore apical on posterior surface. Distribution. Oriental Region (China, Malaysia). Remarks. It is difficult to distinguish this genus from related genera because coloration and head structure are very similar. However, the characteristics of the male genitalia are clearly different; generally the aedeagal shaft is tubular and elongate with paired processes or flanges and the pygofer has processes. Fistulatus resembles the genus Kutara Distant but differs in having male pygofer processes. Fistulatus is related to the genus Carvaka Distant but differ from the latter by aedeagus usually lacking apical paired processes. This genus is also similar to Bhatia Distant but can be differentiated from the latter by lacking aedeagal basal process and appendages between aedeagus and connective.Published as part of Lu, Lin & Zhang, Yalin, 2014, Taxonomy of the Oriental leafhopper genus Fistulatus (Hemiptera: Cicadellidae: Deltocephalinae), with description of a new species from China, pp. 247-250 in Zootaxa 3838 (2) on pages 247-248, DOI: 10.11646/zootaxa.3838.2.10, http://zenodo.org/record/22609
Fotogramas de la Gran Transformación China: still life y 24 City de Jia Zhang-Ke
Full text linkEste artículo explora los vínculos entre cine y ciudad, enfocándose en los procesos de transformación acelerados y de gran envergadura. La intención es demostrar que algunas variantes del cine consiguen agregar piezas fundamentales de la experiencia de transformación urbana. A partir de un análisis de la Gran Transformación China, el artículo reflexiona sobre las intervenciones políticas y estéticas de dos películas de Jia Zhang-Ke: Still Life (2006) y 24 City (2008). La conversión de la economía de planificación en una economía de mercado, la urbanización de china, la desestructuración del comunismo, las migraciones, la ruptura de los vínculos familiares y la relación con el pasado son algunos de los tópicos abordados.This article explores the links between cinema and city, focusing on the processes of rapid and far-reaching transformation. The aim is to show that some variants of cinema get add key pieces of experience of urban transformation. From an analysis of the Great Transformation China, the article focuses on two films of Jia Zhang-Ke ’s political and aesthetic interventions: Still Life (2006) and 24 City (2008). The conversion of planned economy into a market economy, the urbanization of China, the failure of communism, migration, the breakdown of family ties and the relationship with the past are the discussed topics.Fil: Roldan, Diego Pablo. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Centro de Estudios Culturales Urbanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Cientifico Tecnológico Rosario; ArgentinaFil: Pascual, Cecilia María. Universidad Nacional de Rosario. Facultad de Humanidades y Artes. Centro de Estudios Culturales Urbanos; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Cientifico Tecnológico Rosario; Argentin
X-ray properties in massive galaxy clusters: XMM-Newton observations of the REFLEX-DXL sample (<i>Corrigendum</i>)
Full text linkhe article by Zhang et al. (2006, A&A, 456, 55) contains an error in Fig. 5 on page 64, in which we inadvertently re-called the mass distribution of RXCJ0528.9-3972. We note that this does not affect any results in Zhang et al. (2006). Nevertheless, we regret this error and provide an update of Fig. 5 here
Helium recombination lines as a probe of abundance and temperature problems
No full textThe paper presents a simplified formula to determine an electron temperature, T e(He I), for planetary nebulae (PNe) using the He I λ7281/λ6678 line flux ratio. In our previous studies of T e(He I) (Zhang et al. 2005), we used the He I line emission coeffcients given by Benjamin et al. (1999). Here we examine the results of using more recent atomic data presented by Porter et al. (2005). A good agreement is shown, suggesting that the effect of uncertainties of atomic data on the resultant Te(He I) is negligible. We also present an analytical formula to derive electron temperature using the He I discontinuity at 3421 Å. Our analysis shows that T e(He I) values are significantly lower than electron temperatures deduced from the Balmer jump of H I recombination spectra, T e(H I),and that inferred from the collisionally excited [O III] nebular-to-auroral forbidden line flux ratio, T e([O III]). In addition, T e(H I) covers a wider range of values than either T e(He I) or T e([O III]). This supports the two-abundance nebular model with hydrogen-deficient material embedded in diffuse gas of a "normal" chemical composition (i.e. ̃ solar). Copyright 2005: IA, UNAM.link_to_subscribed_fulltex
Synchronization on temporal networks
No full textThis release is part of the paper: Y. Zhang and S. H. Strogatz, "Designing temporal networks that synchronize under resource constraints". The provided code help to reproduce results that demonstrate the advantage of temporal networks in synchronization
Defect Chemistry Special Collection
No full textEngineering defects in materials to tune their properties for different applications has gained momentum in recent years. Chemistry - An Asian Journal and ChemNanoMat, together with Prof. Shuangyin Wang (Hunan University, China), Prof. Qiang Zhang (Tsinghua University, China), Prof. Wei Zhang (Shaanxi Normal University, China), and Prof. Yi Jia (Griffith University, Australia) are greatly honored to assemble a special collection of the latest works on Defect Chemistry, directed mainly towards electrocatalysis, photocatalysis, and electrochemical energy storage.No Full Tex
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