65,042 research outputs found
Fagus chienii W. C. Cheng 1935
No full text<p> <i>Fagus chienii</i> W.C.Cheng (1935: 70).</p> <p> Type:— CHINA. Sichuan [Szechuan]: W. Pingwu Xian [Pingwu hsien], elev. ca. 1300 m, 17 August 1931, <i>W. C. Cheng 2903</i> (lectotype designated here, NAS00070338; isolectotypes A00033870, CQNM0017387, E00098603, IBSC0001170, K000832761, MICH1109337, NAS00070339, NY00248568, PE00022177, PE00022178, PE00022179, PE00022180, PE00022181, PE00022182, PE00022180, SYS00054972, US 00409518).</p> <p> <b>Note</b>:—In the protologue, Cheng indicated <i>W.C. Cheng 2903</i> as the type, but he did not specify the herbarium where the type is deposited. In searching in various herbaria, 18 duplicates were traced and all of them are syntypes since no holotype was designated under Art. 9.6 (Turland <i>et al</i>. 2018). Most duplicates bear cupules and the identification annotation of W. C. Cheng and are well preserved. NAS00070338 is designated here as the lectotype for the reason Cheng used to work in NAS. In the protologue, Cheng (1935) stated the locality of the type at a place near “Yao-erpa” in West of Pingwu Xian; however, none of the duplicates with a label bearing this locality, and it is also uncertain whether “Pingwuhsien” means the present Pingwu Town. For efforts to trace this type locality has not been successful, the identity of this tree species is still uncertain (e.g. Huang <i>et al</i>. 1999).</p>Published as part of <i>Chen, Feng & He, Hai, 2022, The historical relics in Chongqing Natural History Museum: An annotated checklist of original materials for 37 names of Chinese seed plants, pp. 38-52 in Phytotaxa 530 (1)</i> on page 40, DOI: 10.11646/phytotaxa.530.1.3, <a href="http://zenodo.org/record/5823939">http://zenodo.org/record/5823939</a>
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
Molecular engineering of copolymers with donor-acceptor structure for bulk heterojunction photovoltaic cells toward high photovoltaic performance
No full textA series of donor-acceptor (D-A) conjugated copolymers with benzo[1,2-b:4,5-b-]dithiophene (BDT) as donor and two different electron-accepting groups bithiophenevinyl-2-pyran-4-ylidenemalononitrile (TVM) and benzothiadiazole (BT) moieties as acceptors is designed and synthesized. The optical and electrochemical properties show that the band gaps of the copolymers are in the range of 1.70-1.84 eV, and the HOMO and LUMO energy levels can be tuned effectively by controlling the varied ratios between TVM and BT because of the change of the ICT interaction between donor and acceptor, the electron delocalization degree, and the electron cloud density distribution of the copolymers. Bulk heterojunction photovoltaic devices are fabricated by using the copolymers as donors and (6,6)-phenyl-C61-butyric acid methyl ester (PC61BM) or (6,6)-phenyl-C71-butyric acid methyl ester (PC71BM) as acceptors. The optimized photovoltaic performances show that the open-circuit voltage (Voc) was gradually increased from 0.7 to 0.94 V when decreasing the HOMO energy levels of copolymers, and the short-circuit current density (Jsc) is greatly improved by increasing the absorption spectrum in the visible region, increasing the hole mobility and optimizing the morphologies of blend films between copolymers and PCBM. The optimized photovoltaic performance with a Voc of 0.78 V, J sc of 5.47 mA/cm2, fill factor (FF) of 0.40, and power conversion efficiency (PCE) of 1.67% under simulated AM 1.5 solar irradiation of 100 mW/cm2 is obtained by the copolymer PM50 (PM50:PC 61BM, 1:3 w/w, in CB solution). This is due to its high hole mobility and interpenetrating network morphology of PM50:PC61BM blend film. The photovoltaic device based on PM50:PC71BM shows a Jsc of 8.32 mA/cm2 and a PCE of 2.89%
Bishop Odoric Simon Cheng Hede, OFM
No full textBishop Odoric Simon Cheng Hede, OFM. China. B/W Photo.https://digitalcommons.whitworth.edu/cmh_friars_minor/1029/thumbnail.jp
Ochrona wód powierzchniowych w lubuskiem w kontekście realizacji polityki UE
No full textIn this article author – based on literature, documents and statistical data - attempted to analyze the problem of protection surface waters in Lubuskie in the context of the implementation of European Union policy. A review of concepts relating to the EU Water Framework Directive and integrated water management was made. Investment activities in the field of water and wastewater were compared with environmental data in order to obtain a synthetic evaluation of the scale of the province. In summary applied conclusions.W opracowaniu podjęto – na podstawie literatury, dokumentów oraz danych statystycznych – próbę analizy problemu ochrony wód powierzchniowych w województwie lubuskim w kontekście realizacji polityki Unii Europejskiej. Dokonano przeglądu pojęć dotyczących Ramowej Dyrektywy Wodnej UE i zintegrowanego zarządzania wodami. Działania inwestycyjne w zakresie gospodarki wodno-ściekowej porównano z danymi środowiskowymi w celu uzyskania syntetycznej oceny w skali omawianego województwa. W podsumowaniu opracowania zawarto wnioski
Many-electron theory of resonant charge transfer: Role of surface states in He and He+ scattering off Si(100)
No full textA many-electron theory of resonant charge transfer, originally formulated for the scattering of an atom with an empty valence orbital from a surface, is extended to treat the case where the valence orbital is initially occupied by one or two electrons. The scattering of He and He+ from the Si(001) surface is investigated. The interaction is assumed to be with the narrow band of surface states, and not the much wider bulk band. As a result, considerable oscillations are found in the ionization and/or neutralization probabilities as a function of the incident energy.PT: J; CR: AMOS AT, 1989, ADV CHEM PHYS, V76, P335 AMOS AT, 1989, SOLID STATE COMMUN, V71, P449 BLOSS W, 1978, SURF SCI, V72, P277 BRAKO R, 1981, SURF SCI, V108, P253 BURROWS BL, 1984, Q APPL MATH, V42, P73 BURROWS BL, 1990, J PHYS A-MATH GEN, V23, P1101 BURROWS BL, 1991, SURF SCI, V253, P365 CHADI DJ, 1975, PHYS STATUS SOLIDI B, V68, P405 HAGSTRUM HD, 1954, PHYS REV, V96, P336 HAGSTRUM HD, 1961, PHYS REV, V122, P83 HERMAN F, 1963, ATOMIC STRUCTURE CAL IHM J, 1980, PHYS REV B, V21, P4592 MUDA Y, 1980, SURF SCI, V97, P283 MUDA Y, 1988, NUCL INSTRUM METH B, V33, P388 MUDA Y, 1988, PHYS REV B, V37, P7048 PAULING L, 1935, INTRO QUANTUM MECHAN ROBERTS N, 1990, SURF SCI, V236, P112 SOUDA R, 1985, SURF SCI, V150, L59 SOUDA R, 1986, NUCL INSTRUM METH B, V15, P114 SOUDA R, 1986, NUCL INSTRUM METH B, V15, P138 SOUDA R, 1986, SURF SCI, V176, P657 SULSTON KW, 1988, PHYS REV B, V37, P9121 SULSTON KW, 1988, SURF SCI, V197, P555 SULSTON KW, 1989, SURF SCI, V244, P543 WEAKLIEM PC, 1990, SURF SCI, V232, L219 WEISENDANGER R, 1990, SURF SCI, V232, P1; NR: 26; TC: 4; J9: PHYS REV B; PG: 11; GA: HZ245Source type: Electronic(1
Myocardial Infarction Is Coupled with the Activation of Cyclins and Cyclin-Dependent Kinases in Myocytes
No full textTo determine whether the molecular components implicated in the regulation of the cell cycle are activated in myocytes after infarction, the expression of cyclins E, A, and B and the levels of their associated kinase activity were measured at 1 and 7 days following surgery. The quantity of cdk2 and cdc2 and the level of their kinase activity were also determined. Myocardial infarction was characterized by an increase in cyclins E, A, and B and cdc2 proteins in the surviving myocytes at 1 and 7 days. Cyclin E, A, and B and cdk2 and cdc2 kinase activity also increased. The quantity of cyclins E and A and the level of cyclin E-associated kinase activity in myocytes after infarction were comparable with those measured in neonatal myocytes. Moreover, cdc2 protein and cdc2 kinase activity in myocytes reached levels after infarction which were similar to those in neonatal myocytes. Thus, myocytes react to myocardial infarction by activating cyclins and cyclin- dependent kinases which may be coupled with the regeneration of muscle mass and recovery of ventricular function
Acute upper airway obstruction from acquired angioedema
No full textC1 esterase inhibitor deficiency is an unusual cause of acute upper airway angioedema. This case of angioedema is secondary to acquired C1 esterase inhibitor deficiency associated with neoplastic disease and triggered by the use of angiotensin converting enzyme inhibitors. It was sufficiently severe to require emergency airway management. A guide to the evaluation and management of angioedema is presented.William YC Cheng, William B Smith and W John Russel
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