36,517 research outputs found
Special issue: Process safety in times of a pandemic
No full textGreen Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Safety and Security Scienc
Distributed human computation framework for linked data co-reference resolution
No full textDistributed Human Computation (DHC) is a technique used to solve computational problems by incorporating the collaborative effort of a large number of humans. It is also a solution to AI-complete problems such as natural language processing. The Semantic Web with its root in AI is envisioned to be a decentralised world-wide information space for sharing machine-readable data with minimal integration costs. There are many research problems in the Semantic Web that are considered as AI-complete problems. An example is co-reference resolution, which involves determining whether different URIs refer to the same entity. This is considered to be a significant hurdle to overcome in the realisation of large-scale Semantic Web applications. In this paper, we propose a framework for building a DHC system on top of the Linked Data Cloud to solve various computational problems. To demonstrate the concept, we are focusing on handling the co-reference resolution in the Semantic Web when integrating distributed datasets. The traditional way to solve this problem is to design machine-learning algorithms. However, they are often computationally expensive, error-prone and do not scale. We designed a DHC system named iamResearcher, which solves the scientific publication author identity co-reference problem when integrating distributed bibliographic datasets. In our system, we aggregated 6 million bibliographic data from various publication repositories. Users can sign up to the system to audit and align their own publications, thus solving the co-reference problem in a distributed manner. The aggregated results are published to the Linked Data Cloud
Intersystem soft handover for converged DVB-H and UMTS networks
No full textDigital video broadcasting for handhelds (DVB-H) is the standard for broadcasting Internet Protocol (IP) data services to mobile portable devices. To provide interactive services for DVB-H, the Universal Mobile Telecommunications System (UMTS) can be used as a terrestrial interaction channel for the unidirectional DVB-H network. The converged DVB-H and UMTS network can be used to address the congestion problems due to the limited multimedia channel accesses of the UMTS network. In the converged network, intersystem soft handover between DVB-H and UMTS is needed for an optimum radio resource allocation, which reduces network operation cost while providing the required quality of service. This paper deals with the intersystem soft handover between DVB-H and UMTS in such a converged network. The converged network structure is presented. A novel soft handover scheme is proposed and evaluated. After considering the network operation cost, the performance tradeoff between the network quality of service and the network operation cost for the intersystem soft handover in the converged network is modeled using a stochastic tree and analyzed using a numerical simulation. The results show that the proposed algorithm is feasible and has the potential to be used for implementation in the real environment
Beyond interfaces: A usability study of Chinese journal databases
No full textA presentation at the Council on East Asian Libraries (CEAL) annual meeting in Boston, MA on March 21, 2007
Rose Galaida and the Central China Relief Records, 1946: Discovery, Investigation, and Implications
No full textThe materials in the Central China Relief Records (CCRR) collection provide a window to the experiences of Rose Galaida in Hubei. The collection consists of about 100 documents totaling over 300 pages (excluding duplicate copies) and 5 photographs.Peer reviewedPublished in the Journal of East Asian Libraries and available from the journal at: https://scholarsarchive.byu.edu/jeal/vol2011/iss153/
Breaking New Ground in East Asia Library History
No full textReview of Peter X. Zhou. Collecting Asia: East Asian Libraries in North America (2010).Published in H-Net Reviews in the Humanities and Social Sciences and available at: http://www.h-net.org/reviews/showrev.php?id=32231March 201
Author Correction: A fast radio burst source at a complex magnetized site in a barred galaxy (Nature, (2022), 609, 7928, (685-688), 10.1038/s41586-022-05071-8)
No full textIn the version of this article initially published, an equal-contributor footnote was missing for authors H. Xu, J. R. Niu and P. Chen. The Author contributions section has been amended to read “H.X., J.R.N. and P.C. contributed equally and led the data analysis”. The changes have been made to the HTML and PDF versions of the article.link_to_subscribed_fulltex
One step preparation of pure tau-MnAl phase with high magnetization using strip casting method
No full textFerromagnetic phase of Mn-Al exhibits great potential in the rare-earth free permanent magnetic materials due to its high magnetocrystalline anisotropy, high magnetization, high Curie temperature and low cost. In this work, the strip casting technique was applied to prepare MnAl magnetic phase. X-ray diffraction and energy dispersive X-ray analyses indicate that the as-prepared Mn54Al46 strip sample consists of pure tau-MnAl magnetic phase. It is found that the composition of Mn54Al46 is suitable to prepare tau-MnAl phase during the strip casting process. The Mn54Al46 strip sample synthesized through the strip casting exhibits a fairly high magnetization of 114 emu/g under a field of 5 T, while the coercivity of iHc = 2.8 kOe, magnetization of M-5T = 63.9 emu/g at room temperature can be obtained for Mn54Al46 powder sample. This preparation method can produce a large amount of tau-phase MnAl alloy and promote mass industrialized production. (C) 2017 Author(s)
Bambusiphaga nigrigena Chen & Yang 2023, sp. nov.
No full textBambusiphaga nigrigena sp. nov. urn:lsid:zoobank.org:act: 64E81E1C-8DA9-4860-9A54-70754D78F966 Figs 5–7 Diagnosis Bambusiphaga nigrigena sp. nov. can be distinguished from the remaining species of the genus by having the vertex without any markings, the pronotum with dark brown markings on lateral areas, the mesonotum with dark brown markings, the forewings with a large black marking at the base, the anal segment with a long ventral process medially, and the pygofer without a medioventral process. Etymology The specific epithet is derived from a combination of the Latin root prefix ‘ nigr- ’ and ‘ gena ’, referring to the ‘genae’ being dark brown. Type material Holotype CHINA • ♂; Yunnan, Menghai County; 21°91′ N, 100°44′ E; 23 Jul. 2019; H.X. Li, S.Y. Xu and N. Gong leg.; on bamboo; GUGU-DE-BA-20190701. Paratypes CHINA • 7 ♂♂, 2 ♀♀; same collection data as for holotype; GUGU-DE-BA-20190702 to GUGU-DE-BA-20190710 • 5 ♂♂, 3 ♀♀; Yunnan, Ruili County; 24°05′ N, 97°96′ E; 21 Aug. 2016; L. Yang and X.S. Chen leg.; on bamboo; GUGU-DE-BA-20190711 to GUGU-DE-BA-20190718 • 6 ♂♂, 5 ♀♀; Yunnan, Mengla County; 21°93′ N, 101°26′ E; 30 Aug. 2017; Q. Luo and Z.X. Zhou leg.; on bamboo; GUGU-DE-BA-20190719 to GUGU-DE-BA-20190729 • 9 ♂♂, 6 ♀♀; Yunnan, Mengla County; 21°93′ N, 101°25′ E; 11 Aug. 2018; J.K. Long and X.S. Chen leg.; on bamboo; GUGU-DE-BA-20190730 to GUGU-DE-BA-20190744 • 27 ♂♂, 14 ♀♀; Yunnan, Ruili County; 24°07′ N, 97°82′ E; 23 Aug. 2018; H.X. Li, N. Gong, F.E. Li and Q. Luo leg.; on bamboo; GUGU-DE-BA-20190745 to GUGU-DE-BA-20190785 • 3 ♂♂, 1 ♀; Yunnan, Jinghong County; 21°57′ N, 100°67′ E; 17 Jul. 2019; H.X. Li, N. Gong, F.E. Li and S.Y. Xue leg.; on bamboo; GUGU-DE-BA-20190786 to GUGU-DE-BA-20190789 • 1 ♂; Yunnan, Mengla County; 21°21′ N, 101°71′ E; 18 Jul. 2019; H.X. Li leg.; on bamboo; GUGU-DE-BA-20190790. Description MEASUREMENTS. Body length including forewing: male 3.2–3.5 mm (N = 10), female: 3.4–3.8 mm (N = 10). COLORATION. General color yellowish white to yellowish brown, with dark brown markings (Fig. 5). Vertex, frons, rostrum and antennae lightly yellowish white. Genae dark brown. Clypeus (Fig. 5E) yellowish white, anteclypeus and lateral sides of postclypeus dark brown. Eyes and ocelli reddish brown. Pronotum (Fig. 5C) dark brown, central areas of lateral carinae mostly yellowish white. Mesonotum (Fig. 5C) yellow to dark brown, apex of scutellum yellowish white. Forewings (Fig. 5F) pale yellowish white, almost hyaline, with large dark brown marking at basal area. Legs (Fig. 5D–E) yellowish white, except femora of fore legs and median legs dark brown. Abdomen dark brown, except posterior margin of each segment yellowish brown. HEAD AND THORAX. Vertex (Figs 5C, 6A) at midline shorter than wide at base (1:1.84), width at apex narrower than at base (1:1.84), anterior margin truncate, lateral and submedian carinae distinct, median carina indistinct. Frons (Figs 5E, 6B) in middle line longer than wide, at widest part about 2.56: 1, widest at apex, median carina simple. Base of postclypeus (Figs 5E, 6B) as wide apex of frons. Antennae (Figs 5E, 6B) with basal segment 1.15 × as long as wide, shorter than second segment (1: 1.90). Pronotum (Figs 5C, 6A) longer than vertex medially (1.16: 1). Mesonotum (Figs 5C, 6A) 2.28 × as long as vertex and pronotum together in middle line. Forewings (Fig. 5F) longer in middle line than broad at widest part (2.70:1), transverse venation located in middle near base. MALE GENITALIA. Anal segment (Fig. 6C, F) ring-like, with a long ventral process medially. Pygofer (Fig. 6C–D) in profile with dorsal margin shorter than ventral margin, posterior margin slightly sinuate; opening in posterior view longer than wide, ventral margin broadly concave, without medioventral process. Genital styles (Fig. 6G–H) in posterior view very long and narrow, lateral margins subparallel, tapering apically, slightly divergent apically; in profile arched medially. Aedeagus without phyllobase. Phallus (Fig. 6I) stout, strongly curved dorsally at basal ⅓, thin and slightly curved ventrally at apical ⅓. Host plant Bambusoideae. Distribution China (Yunnan). Remarks This new species is similar to B. maculata Chen & Li, 2000 in general appearance, but differs in the following: (1) genae, anteclypeus and lateral sides of postclypeus (Fig. 5E) dark brown (vs genae and clypeus (Chen & Li 2000: fig. 2) pale yellowish white in B. maculata); (2) anal segment of male (Fig. 6C) with a ventral process medially (vs anal segment of male (Chen & Li 2000: fig. 4) with a ventral process laterally on left side in B. maculata); (3) pygofer (Fig. 6C) without medioventral process (vs pygofer (Chen and Li 2000: fig. 8) with medioventral process developed in B. maculata); (4) genital styles (Fig. 6G) with apex not forked (vs genital styles (Chen & Li 2000: fig. 7) with apex forked in B. maculata). This new species is also similar to B. kunmingensis Yang & Chen, 2011 in general appearance, but differs in the following: (1) forewings (Fig. 5F) with a hyaline macula at basal ⅓ (vs forewings (Yang & Chen 2011: fig. 3) with entire basal ⅓ dark brown in B. kunmingensis); (2) anal segment of male (Fig. 6C, F) with a long ventral process medially (vs ventral margin of anal segment (Yang & Chen 2011: fig. 6) without a process in B. kunmingensis); (3) genital styles (Fig. 6G) without a process (vs inner margin of genital styles (Yang & Chen 2011: fig. 8) with an angular process near apical ¼ in B. kunmingensis); (4) aedeagus (Fig. 6I) without phyllobase (vs aedeagus (Yang & Chen 2011: fig. 10) with phyllobase in B. kunmingensis).Published as part of Li, Hong-Xing, Chen, Xiang-Sheng & Yang, Lin, 2023, Three new species of the bamboo-feeding planthopper genus Bambusiphaga Huang & Ding from China (Hemiptera: Fulgoroidea: Delphacidae), pp. 142-158 in European Journal of Taxonomy 875 on pages 152-156, DOI: 10.5852/ejt.2023.875.2145, http://zenodo.org/record/808298
Turbulent skin-friction drag reduction by travelling waves induced by spanwise Lorentz force
No full textThe streamwise and spanwise travelling waves induced by spanwise Lorentz force are studied for skin-friction drag reduction in a turbulent channel. The streamwise travelling wave by spanwise Lorentz force on drag reduction is compared to the with the spanwise wall motion. The drag reduction map shows a drag reduction region and a drag increase region, depending on a time scale . For spanwise travelling wave, a large drag reduction appears at large oscillation frequencies and small spanwise wave numbers, while all stationary wave cases give a drag increase. When the wave travels at an oblique angle to the streamwise mean flow, the optimal drag reduction appears in backward travelling wave case. Generally, the backward streamwise travelling wave is found to be most efficient in drag reduction among all oblique travelling waves. Spanwise oscillation, forward streamwise travelling, spanwise travelling and backward streamwise travelling wave cases share a similar drag reduction mechanism: first, the spanwise motion directly breaks the near wall quasi-streamwise vortices structure array \cite{Jeong_etal1997}, which results in the shortening of streamwise streaks; second, the spanwise velocity layer maintains the asymmetry of the positive and negative quasi-streamwise vortices, which leads to a sustained drag reduction
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