2,689 research outputs found
A historical comment about the GVT in short interval
No full textIn this article, the author introduces the history, progress and method in the Goldbach-Vinogradov Theorem in short interval by which every sufficiently large odd integer could be expressed as the sum of three almost equal prime numbers.http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000183488400018&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=8e1609b174ce4e31116a60747a720701MathematicsCPCI-S(ISTP)
Investigation on the DC CB Performance during a Current Interruption Failure at First Current Zero
No full textThe vacuum interrupter is used as the key component of an active DCCB due to its excellent interruption and dielectric recovery characteristics after current zero. The vacuum interrupter can only interrupt the fault currents below the limitation of a critical di/dt and TIV, otherwise it causes a reignition and the interruption failure. In this paper, a detailed active injection DC CB model is developed, considering operation delay of switches, parasitic parameters of switches and thorough control logic. The limitation dielectric strength between the vacuum gap is defined by the cold break down voltage. Based on the numerical modelling, investigation will be performed to see the performance of DC CB with a failure interruption on the first current zero. The simulation results can help to optimize the injection circuit parameters when DC CB has a failure on the first current zero and has to interrupt in the next current zeros. This algorithm will consider predefined threshold of di/dt, chopping current and variable operation time in different scenarios.Green 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.Intelligent Electrical Power Grid
Technical performance of different DC CB technologies for future HVDC Grids
No full textMultiterminal dc (MTDC) network is preferred due to its reliability, security of supply and flexibility. However, MTDC network also comes with the protection challenges resulting from dc faults. Hence, the dc circuit breaker (DC CB) is imperative in such a network. In these recent years, several DC CB technologies have been proposed and demonstrated by different manufacturers. Besides, these DC CB technologies differ from each other in terms of the speed of operation, interruption capability and costs. Hence, for the optimal performance of the MTDC network, a study of the co-ordinative operation of different DC CB technologies is required. In this thesis, two typical types of DC CBs are modelled in detail and implemented in a 4-terminal MTDC network in PSCAD environment, by considering operation time, interruption capability and interruption characteristics. The obtained results are used for DC CB’s selection optimization methodology for the future MTDC networks. Similarly, a scaled model of DC CB has to be analysed in terms of its interruption capability in MTDC network considering various scenarios. Therefore, in this master thesis, technical performance of DC CB technologies is conducted for a test and multiterminal dc network in EMT based software environment.The DC CB is the key to unlock the reliable operation of a Multi-terminal direct current network, whereas fast, effective and accurate models are frequently needed for system-level studies. Due to higher subsystem components in DC CB, a detailed DC CB model creates a bottleneck in the network analysis. This thesis also proposes and compares, an average model with a detailed model of Voltage source converter Assisted Resonant Current (VARC) and Mechanical DC CB in MTDC Network in terms of their performance and computation time for two typical simulation cases. The average and detailed model is modelled and simulated on the PSCAD/EMTDC electromagnetic transient platform. Decisively, this thesis concludes by presenting an accurate response of the average model during the fast transient event, showing additional computational advantage.<br/
The characteristics of the polish CB-language
No full textThe paper analyzes the language used by drivers on the Citizens’ Band radio (CB radio). The
users of the radio communicate only in speech, their communication is highly pragmatic and
based on partnership. The utterances alternate between formal and informal ones, which
determines the range and register of vocabulary. Drivers often use diminutives and polite
addresses thus creating the atmosphere of mutual respect and cordiality, which can be
comforting and reassuring for strangers who happen to establish a casual contact. The specific
language used on the CB radio fulfils two basic functions: it creates a sense of community
among drivers and protects the information passed on as warnings. At the end of the paper,
the author appends a comprehensive glossary of the CB language
CB[7]•4 uptake and intracellular stability of CB[7] in RAW264.7 cells.
No full text<p>Both the dose titration and time course assays used RAW264.7cells incubated with CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>4</b> for 20 mins prior to analysis. (A) Dose titration assay used CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>4</b> concentrations of 3.2 (green) and 32 µM (red). (B) Statistical analysis of the percentage of cells positive for fluorescence. (C) Timecourse assay was conducted using 32 µM of CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>4</b>. After incubation with the fluorescent container, cells were chased for 15 (green), 45 (red) and 120 min (blue) (D) Statistical analysis of the percentage of cells positive for fluorescence.</p
Modelling of GO/PPy/CB and rGO/PPy/CB nanocomposite supercapacitors using an electrical equivalent circuit
No full textIn this study, supercapacitor device performances of graphene oxide (GO), reduced graphene oxide (rGO), polypyrrole (PPy), and ternary nanocomposites of GO, PPy, and carbon black (CB) as GO/PPy/CB and rGO/PPy/CB were firstly prepared using the in situ polymerization method. The obtained composite materials were characterized by scanning electron microscopy energy–dispersive X-ray (SEM–EDX), Fourier-transform infrared-attenuated transmission reflectance (FTIR-ATR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA), atomic force microscopy (AFM), Brunauer–Emmett–Teller (BET) surface area analysis, cyclic voltammetry (CV), galvanostatic charge–discharge (GCD), and electrochemical impedance spectroscopic (EIS) methods. The highest specific capacitance (Csp) of the rGO/PPy/CB nanocomposite was obtained as Csp = 39, 48, and 27.86 F × g?1 by three methods of CV, GCD, and EIS, respectively. Two equivalent circuit models of Rs(CdlRct) and LRs(QRct) were presented to compare equivalent circuit parameters. Theoretical and experimental values are compatible with each other. Graphical abstract: [Figure not available: see fulltext.]. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.Trakya ÜniversitesiThis work is a part of the research project NKUBAP.01.?NAP.19.213 approved by the Scientific and Research Project Unit (Tekirdag Namik Kemal University). This research grant is gratefully acknowledged. We thank Prof. Dr. Murat Turkyilmaz and Ozan Yoruk (PhD student) for TGA and BET measurements (TUTAGEM, Trakya University, Turkey)
Odorrana mutschmanni Pham & Nguyen & Le & Bonkowski & Ziegler 2016, sp. nov.
No full textOdorrana mutschmanni sp. nov. (Figs. 2, 3) Holotype: IEBR 3723 (Field No. CB 2015.12), adult male, collected by T.Q. Nguyen on 22 April 2015 in the karst forest near Coong Village (22o42.712’N, 106o40.075’E, at an elevation of 447 m), Duc Quang Commune, Ha Lang District, Cao Bang Province, Vietnam. Paratypes: IEBR 3724 (Field No. CB 2012.77), adult males, collected on 15 April 2012; IEBR 3725 (Field No. CB 2012.89), adult female and IEBR 3726–3729 (Field No. CB 2012.90–93), adult males, collected on 16 April 2012, by T.Q. Nguyen et al.; ZFMK 97329, 97330 (Field No. CB 2012.139, 2012.140), adult males, collected on 3 May 2012, by H. T. An, S. Herbst and T. Lehmann; IEBR 3730 (Field No. CB2014.16), adult female, collected by C.T. Pham et al. on 10 June 2014, IEBR 3731 (Field No. CB 2015.11), adult female, collected by T.Q. Nguyen on 22 April 2015, the same data as the holotype. Diagnosis. The new species was strongly supported as a member of Odorrana based on molecular analyses (Fig. 1) and is distinguishable from its congeners by a combination of the following morphological characters: (1) size large (SVL 85.9–91.6 mm in males, 108.7–110.1 mm in females); (2) head longer than wide; (3) vomerine teeth present; (4) external vocal sacs absent; (5) snout short (SL/SVL 0.16–0.17); (6) tympanum large (TD/ED 0.70 in males, 0.68 in females); (7) dorsal surface of head and anterior part of body smooth, posterior part of body and flanks with small tubercles; (8) supratympanic fold present; (9) dorsolateral fold absent; (10) webbing formula I0– 0II0–0III0–1/ 2IV 1/2–0V; (11) in life, dorsum green with dark brown spots; (12) flanks greyish brown with dark brown spots; (13) throat and chest grey, underside of limbs with large dark brown spots, edged in white, forming a network. Description of holotype. Adult male; SVL 85.9 mm; head longer than wide (HL 33.6 mm, HW 29.9 mm); snout round anteriorly in dorsal view, projecting beyond lower jaw; nostril lateral, closer to the snout tip than to eye (NS 6.2 mm, EN 7.5 mm); canthus rostralis distinct; pupil horizontally oval; loreal region slightly concave and oblique; snout length greater than eye diameter (SL 14.0 mm, ED 9.9 mm); internarial distance wider than interorbital distance and upper eyelid (IND 10.5. mm, IOD 9.7 mm, UEW 6.6 mm); tympanum distinct, round, 70% eye diameter (TD 6.9 mm); vomerine teeth in two oblique ridges; tongue cordiform, deeply notched posteriorly; vocal sac absent. Forelimbs: Forelimb length (FLL 16.6 mm), hand length (HAL 44.4 mm); relative finger lengths: II 2 times of the width of phalanges and about 40% the diameter of tympanum; subarticular tubercles round, formula 1, 1, 2, 2; inner metatarsal tubercle oval, elongate; outer metatarsal tubercle small; finger I with nuptial pad, elongate. Hindlimbs: Tibia longer than thigh (FeL 38.1 mm, TbL 46.9 mm), approximately five times longer than wide (TbW 9.8 mm); tips of toes expanded into discs, with circummarginal grooves; width of toe IV disc narrower than width of finger III disc, approximately two times of the width of phalanges; relative length of toes: I 2 times base of phalanges (vs. ≤ 2 times base of phalanges in O. andersonii), and different egg color (wholly unpigmented vs. pigmented in O. andersonii); from O. jingdongensis by having a higher ratio of TD/ED 0.70 in males and 0.68 in females (vs. 0.54 in males and 0.51 in females in O. jingdongensis), different ventral color pattern (large dark spots vs. immaculate white in O. jingdongensis), males without spines on chest (vs. present in O. jingdongensis), and the disc of finger III> 2 times base of phalanges (vs. ≤ 2 times base of phalanges in O. jingdongensis); from O. margaretae by having large dark spots on belly (vs. small dark spots in O. margaretae), males without spines on chest (vs. present in O. margaretae), the disc of finger III> 2 times base of phalanges (vs. ≤ 2 times base of phalanges in O. margaretae), more developed toe webbing (complete to disc on I vs. as narrow fringe to disc on I in O. margaretae), and different egg color (wholly unpigmented vs. pigmented in O. margaretae); from O. kuangwuensis by having a larger body size (SVL 87–92 mm in males and 108–110 mm in females vs. 57 mm in males and 69–71 mm in females in O. kwangwuensis), a higher ratio of TD/ED 0.70 in males and 0.68 in females (vs. 0.55 in males and 0.5 in females in O. kwangwuensis), different ventral color pattern (large black spots vs. white with some black spots in O. kwangwuensis), and the disc of finger III> 2 times base of phalanges (vs. ≤ 2 times base of phalanges in O. kwangwuensis); from O. grahami by having a higher ratio of TD/ED 0.70 in males and 0.68 in females (vs. 0.53 in males and 0.48 in females in O. grahami), different ventral color pattern (large black spots vs. immaculate white in O. grahami), males without spines on chest (vs. present in O. grahami), the disc of finger III> 2x base of phalanges (vs. finger III without disc in O. grahami), and different egg color (wholly unpigmented vs. pigmented in O. grahami); from O. junlianensis by having a higher ratio of TD/ED 0.70 in males and 0.68 in females (vs. 0.47 in males and 0.46 in females in O. junlianensis), the absence of external vocal sacs (vs. present in O. junlianensis), and males without spines on chest (vs. white spinules present on the chest in O. junlianensis), the disc of finger III> 2 times base of phalanges (vs. ≤ 2 times base of phalanges in O. junlianensis), and different egg color (wholly unpigmented vs. pigmented in O. junlianensis); from O. wuchuanensis by having a larger size (SVL 87–92 mm in males and 108–110 mm in females vs. 71–77 mm in males and 76–90 mm in females in O. wuchuaensis), a smaller ratio TD/ED (0.70 in males and 0.68 in females vs. 0.83 in males and 0.8 in females in O. wuchuaensis), dorsal surface of head and anterior part of body smooth (vs. shagreened in O. wuchuanensis), different color pattern of flank and limbs (brown vs. green in O. wuchuanensis), and males without white spines on dorsal surface of arm (vs. present in O. wuchuanensis). Odorrana mutschmanni sp. nov. differs from O. absita, O. anlungensis, O. ammaiensis, O. aureola, O. bacboensis, O. banaorum, O. bolavensis, O. chloronota, O. exiliversabilis, O. fengkaiensis, O. gigatympana, O. graminea, O. hainanensis, O. heatwolei, O. hejingensis, O. hosii, O. huanggangensis, O. khalam, O. lipuensis, O. lungshengensis, O. macrotympana, O. monjerai, O. morafkai, O. nanjingensis, O. narina, O. nasica, O. nasuta, O. orba, O. rotodora, O. schmakeri, O. sinica, O. tiananensis, O. tianmuii, O. tormota, O. yentuensis, O. yizhangensis, and O. zhaoi, by having a larger size (SVL 87–92 mm in males vs. ≤ 70 mm in males in other species). Odorrana mutschmanni sp. nov. further differs from O. absita, O. amamiensis, O. aureola, O. banaorum, O. chloronota, O. exiliversabilis, O.gigatympana, O. graminea, O. hosii, O. indeprensa, O. khalam, O. leporipes, O. livida, O. morafkai, O. nasica, O. nasuta, O. orba, O. swinhoana, O. tormota, O. trankieni, O. versabilis, O. yentuensis, and O. zhaoi by the presence of black bars on lips (vs. absent in the latter). Odorrana mutschmanni sp. nov. differs from O. absita, O. alungensis, O. banaorum, O. bolavensis, O. exiliversabilis, O. hosii, O. indeprensa, O. khalam, O. leporpes, O.monjerai, O. narina, O. nasica, O. supranarina, O. tormota, O. trankieni, O. utsunomiyaorum, O. versabilis, O. yentuensis, and O. zhaoi by lacking dorsolateral folds (vs. present in the latter). Odorrana muschmanni sp. nov. differs from O. amamiensis, O. bacboensis, O. bolavensis, O.chapaensis, O. exiliversabilis, O. geminata, O. gigatypana, O. hainanensis, O. heatwolei, O. lipuensis, O. macrotympana, O. nasica, O. orba, O. utsunomiyaorum, O. supranarina, O. tiannanensis, O. tormota, O. versabilis, and O. yentuensis by having a green dorsum (vs. brown, light brown, olive-brown, reddish-brown, gray-blue, iridescent blue or grassgreen in the latter). Odorrana mutschmanni sp. nov. differs from O. absita, O. aureola, O. bacboensis, O. banaorum, O. bolavensis, O. chapaensis, O. chloronota, O. fengkaiensis, O. geminata, O. graminea, O. gigatympana, O. heatwolei, O. indeprensa, O. ishikawae, O. khalam, O. lungshengensis, O. morafkai, O. nasica, O. orba, O. swinhoana, O. tinananensis, O. tormota, O. trankieni, O. yentuensis, O. yizhangensis, and O. zhaoi by the absence of vocal sacs in males (vs. present in the latter)Published as part of Pham, Cuong The, Nguyen, Truong Quang, Le, Minh Duc, Bonkowski, Michael & Ziegler, Thomas, 2016, A new species of Odorrana (Amphibia: Anura: Ranidae) from Vietnam, pp. 421-435 in Zootaxa 4084 (3) on pages 423-430, DOI: 10.11646/zootaxa.4084.3.7, http://zenodo.org/record/105221
„Misiek z okularami na hulajnodze”, czyli o CB-polszczyźnie
No full textThe paper analyzes the language used by drivers on the Citizens’ Band radio (CB radio). The users of the radio communicate only in speech, their communication is highly pragmatic and based on partnership. The utterances alternate between formal and informal ones, which determines the range and register of vocabulary. Drivers often use diminutives and polite addresses thus creating the atmosphere of mutual respect and cordiality, which can be comforting and reassuring for strangers who happen to establish a casual contact. The specific language used on the CB radio fulfils two basic functions: it creates a sense of community among drivers and protects the information passed on as warnings. At the end of the paper, the author appends a comprehensive glossary of the CB language
Intracellular localization of CB[7] in RAW264.7 cell.
No full text<p>Cell incubated with Dextran-647 and CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>5</b> showed intracellular localization of CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a> through the endosomal pathway. RAW264.7cells were incubated with Dextran-647 (green) overnight and CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>5</b> (red) for 20 min the following day. Cells were chased for 15 (A), 45 (B) and 120 min (not shown) after incubation with CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>•<b>5</b>. Arrows indicate co-localization.</p
RAW264.7 toxicology assays using CB[7].
No full text<p>These results signified high cell tolerance at concentrations of up to 1 mM of CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a>. RAW264.7cells were incubated with the CB<a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone.0010514-Challa1" target="_blank">[7]</a> and camptothecin for two days before conducting both MTS (A) and AK (B) assays. Both assays were conducted following the procedure indicated in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010514#pone-0010514-g002" target="_blank">Fig 2</a>.</p
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