76,227 research outputs found
Native p-type transparent conductive CuI via intrinsic defects
No full textThe ability of CuI to be doped p-type via the introduction of native defects has been investigated using first-principles pseudopotential calculations based on density functional theory. The Cu vacancy has a lower formation energy than any of the other native defects, which include I vacancy (V(I)), Cu interstitial (Cu(i)), I interstitial (I(i)), Cu antisite (Cu(I)), and I antisite (I(Cu)). Combined with its shallow acceptor level, it offers sufficient hole concentrations in CuI. The natural band alignments as compared to zinc-blende ZnS, ZnSe, and ZnTe have also been calculated in order to further identify the p-type dopability of CuI. It is found that CuI has a relatively high valence band maximum and conduction band minimum, which also makes it easy to dope CuI p-type in terms of the doping limit rule. In addition, the small effective mass of the light hole-about 0.303m(0)-can provide high mobility and p-type conductivity in CuI. All of these results make CuI an ideal candidate for native p-type materials (C) 2011 American Institute of Physics. [doi:10.1063/1.3633220
jj1bdx/wspr-cui: 20240214
No full text<ul>
<li>Fix clicking at the beginning and end of the transmission signal generated by wsprsimwav (see https://github.com/jj1bdx/wspr-cui/issues/5 for the details</li>
<li>Miscellaneous code fix based on WSJT-X 2.7.1 pre-release code</li>
</ul>
Impact damage of composite laminates with high-speed waterjet
No full textRain erosion may cause substantial damage to aircrafts during supersonic flight. Such event is investigated here via high-speed waterjet impact on composite laminates. An experimental setup is developed to produce waterjets with the speed up to 700m/s and a finite element model of the waterjet-composite impact event is established. The consistency of experiment and simulation results validates the adopted numerical methods. The distribution of the water-hammer pressure is non-uniform and the maximum pressure occurs near the contact periphery when the water is about to eject laterally. After a high-speed (300∼560m/s) waterjet impacts a composite laminate, the impacted surface depression is observed, and the typical surface damage presents a central region with no visible surface damage surrounded by a faded “failure ring” with resin removal, matrix cracking and minor fiber fracture. Delamination occurs at the interfaces of adjacent layers with unequal dimensions and longitudinal matrix cracking appears on the back surface. Both the velocity and the diameter of waterjets are crucial factors on CFRP damage extents. Water-hammer pressure, the stagnation pressure and propagation of stress waves are failure mechanisms for most matrix damage in CFRP impacted by waterjets.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.Structural Integrity & Composite
Meliniella nodula Li, Cui & Fan 1994
No full textnodula Li, Cui & Fan, 1994: 129 (Meliniella). Holotype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.14 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white label: “ Meliniella nodula sp.n. ”; (3) printed with handwritten inscriptions on white label: “ TYPE / Meliniella / nodula / Li, Cui et Fan ”. Preservation: pinned; specimen intact. Paratype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.14 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white label: “○2626”; (3) printed with handwritten inscriptions on white label: “ PARATYPE / Meliniella / nodula / Li, Cui et Fan ”. Preservation: pinned; genitalia dissected. Missing parts: genitalia. Current name: Chirosia nodula (Li, Cui & Fan, 1994).Published as part of ZHANG, XUFENG & ZHU, WEIBING, 2014, The types of Anthomyiidae (Diptera) in the Shanghai Entomological Museum, Chinese Academy of Science, China, pp. 1-67 in Zootaxa 3756 (1) on page 40, DOI: 10.11646/zootaxa.3756.1.1, http://zenodo.org/record/503313
Caecina sinica Cui, Li & Cai, sp. nov.
No full textCaecina sinica Cui, Li & Cai, sp. nov. (Figs. 1–9) Description. Color. Yellowish brown. Eyes blackish brown; irregular markings on head beneath reddish; membrane darkish brown. Structures. Body ovate, covered with closely long setae. Head rhombic in dorsal view. Vortex even. Transverse constriction slightly behind posterior margin of eyes. Interocellar space shorter than diameter of ocellus. Distance between ipsilateral ocellus and eye about 1.5 times as long as diameter of ocellus. Antenna with long setae, length of setae about 3–4 times diameter of corresponding antennal segment; first segment obviously longer than head, and slightly shorter than pronotum; second segment about 0.75 times as long as first. Eyes prominent, reniform. Anteocular portion shorter than postocular portion (excluding neck). First rostral segment extending beyond posterior margin of eye; first and second rostral segments subequal in length. Pronotum nearly triangular; anterior lobe with many stout, short, nearly same-sized spines; anterior angle of pronotum with a spine and another spine closely posterior to it; anterior margin with 2 medium-sized spines; posterior part of lateral margins of anterior lobe with obvious spines; posterior lobe coarse, with longitudinal depression not reaching posterior margin; lateral margins of posterior pronotal lobe smooth, lateral angles round. Legs clothed with long setae, third tarsomere slightly longer than first two tarsomeres combined. Scutellum trapezoidal, apical prongs of scutellum well separated basally. Membrane of hemelytron extending beyond apex of abdomen. Anterior region of each abdominal sternum with distinct, coarse transverse depression, this with many longitudinal crenulations (Fig. 3); lateral margins of second to sixth sterna each with a round depression. Sterna of third to sixth abdominal segments with shallow, longitudinal groove at middle. Pygophore stout, apex of median process rounded (Figs. 4–5); paramere clavate, inner side of apex with a process (Fig. 6); pedicel of phallus somewhat long and wide, basal plate shorter than pedicel (Fig. 7); phallosoma ovate, struts separated basally and fused distally (Figs. 8–9). Measurements [in mm., ♂ (n= 1)]. Body length 10.9, width 3. 0; length head 1.5, width 1.2; length antennal segments I: II: III: IV= 1.9: 1.5: 0.5: 0.4 (apical segments missing); length pronotum 2.9, width 2.4; length scutellum (excluding prongs) 0.65, width 1.3; length corium 4.6, width 1.5; length forewing 7.6, width 2.9; length rostral segments I: II: III = 1.1: 1.0: 0.4. Material examined. Holotype, ♂, China, Xizang, Motuo, Kabu, 1070 m, 7 -V- 2005. Distribution: China (Xizang). Etymology: The species name comes from the location of the holotype. Notes. It is easy to distinguish this species from its congeners. The pronotal collar of the new species is not distinct as it is in most species of this genus. The anterior margin of the collar has 2 medium-sized spines, whereas this margin is often smooth in most species of this genus.Published as part of Cui, Jianxin, Li, Hu & Cai, Wanzhi, 2008, The discovery of the genus Caecina Stål (Hemiptera: Reduviidae: Ectrichodiinae) from China, with the description of a new species, pp. 44-48 in Zootaxa 1727 on page 45, DOI: 10.5281/zenodo.18124
Ban dao ti yi zhi jie gou zai guang cui hua he guang dian cui hua zhong de yan jiu
No full textLi, Qian = 半導體异质结构在光催化和光電催化中的研究 / 李乾.Thesis Ph.D. Chinese University of Hong Kong 2015.Includes bibliographical references (leaves 145-162).Abstracts also in Chinese.Title from PDF title page (viewed on 30, December, 2016).Li, Qian = Ban dao ti yi zhi jie gou zai guang cui hua he guang dian cui hua zhong de yan jiu / Li Qian
Sweltsa brevihamula Dong & Cui & Li 2018, sp. nov.
No full textSweltsa brevihamula sp. nov. (Figs. 1–12) Adult habitus. General color greenish. Head with a large, quadrate, median dark area; compound eyes dark, ocelli with dark rings; antennae pale but distal flagella brown (Figs. 1–2). Pronotum with brown symmetrical medial pattern (Figs. 1–2). Meso- and metathoracic nota with brown U-shaped marks. Wings hyaline; legs pale. Abdominal terga 1–8 with median brown stripe; stigma of terga 2–7 trapezoidal, with tergum 1 being triangular and tergum 8 rounded (Fig. 1). Cerci pale with long setae. Male. Body length 9.4 mm; forewing length 8.0 mm; hindwing length 7.0 mm. Tergum 9 sclerotized, anteromedial portion membranous, transverse ridge sclerotized and band-shaped (Fig. 3), the ridge in lateral aspect forming triangular process (Figs. 4 –5). Epiproct: in dorsal view, parallel-sided for most of its length with apex narrowed; in lateral view the apex up-curved, ventral portion of the apex slightly swollen after KOH treatment (Figs. 3–7, 10–12). Aedeagus membranous without hairs, with a small triangular subapical lateral lobe, apical half tubular, much more slender than basal portion; basal portion bulbous, with conical basolateral and mesoventral lobes (Figs. 8–9). Female and larva. Unknown. Type material. Holotype male (HIST), CHINA: Sichuan Province, Mianyang City, Pingwu County, Laohegou National Nature Reserve, Xiaopiangou, 2377m, 32°30'37'' N, 104°38'33'' E, 2012. V.25, coll. Sipei Liu. Etymology. The specific epithet refers to the short (“brev”), up-curved hook-like apex (“ hamula ”) of the epiproct. Remarks. Sweltsa brevihamula can be recognized by the up-curved apex of the epiproct. Sweltsa brevihamula is similar to S. baiyunshana Li, Yang & Yao, 2014 in general habitus, but males can be distinguished from the latter species by the pronotum without a brown margin and an almost parallel-sided epiproct without an upraised, tongue-like cap apically (See Li et al. 2014, figs. 8–11), but with an up-turned apex. The new species is also related to S. longistyla (Wu, 1938), but the apex of the epiproct of S. brevihamula in lateral aspect is up-curved.Published as part of Dong, Wenbin, Cui, Jianxin & Li, Weihai, 2018, A new species of Sweltsa (Plecoptera: Chloroperlidae) from Sichuan Province of southwestern China, pp. 388-392 in Zootaxa 4418 (4) on page 388, DOI: 10.11646/zootaxa.4418.4.5, http://zenodo.org/record/124494
Phorbia morulella Fan, Li & Cui 1994
No full textmorulella Fan, Li & Cui, 1994: 133 (Phorbia). Holotype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.8 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white paper: “2727”; (3) handwritten on white label: “ Phorbia morulella / sp.n.”; (4) printed with handwritten inscriptions on red label: “ TYPE / Phorbia / morulella / Fan, Li et Cui ”. Preservation: pinned. Missing parts: left hind leg. Paratype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.8 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white label: “ Phorbia ”; (3) printed with handwritten inscriptions on red label: “ PARATYPE / Phorbia / morulella / Fan, Li et Cui ”. Preservation: pinned. Missing parts: left hind leg. Current name: Phorbia morulella Fan, Li & Cui, 1994.Published as part of ZHANG, XUFENG & ZHU, WEIBING, 2014, The types of Anthomyiidae (Diptera) in the Shanghai Entomological Museum, Chinese Academy of Science, China, pp. 1-67 in Zootaxa 3756 (1) on pages 38-39, DOI: 10.11646/zootaxa.3756.1.1, http://zenodo.org/record/503313
Pegohylemyia peltophora Li, Cui & Fan 1994
No full textpeltophora Li, Cui & Fan, 1994: 129 (Pegohylemyia). Holotype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.14 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white label: “No.Θ”; (3) handwritten on white label: “ Pegohylemyia / peltophora sp.n. ”; (4) printed with handwritten inscriptions on red label: “ TYPE / Botanophila / peltophora / (Li, Cui et Fan) ”. Preservation: pinned. Missing parts: left legs; right hind leg. Paratype male with labels: (1) printed with handwritten inscriptions on white label: “19 85.IV.16 / Lushi Xiaoqima River / collector Shujian Li ”; (2) handwritten on white label: “ Pegohylemyia ”; (3) printed with handwritten inscriptions on red label: “ PARATYPE / Botanophila / peltophora / (Li, Cui et Fan) ”. Preservation: pinned. Missing parts: tibia and tarsus of left mid leg. Current name: Botanophila peltophora (Li, Cui & Fan, 1994).Published as part of ZHANG, XUFENG & ZHU, WEIBING, 2014, The types of Anthomyiidae (Diptera) in the Shanghai Entomological Museum, Chinese Academy of Science, China, pp. 1-67 in Zootaxa 3756 (1) on pages 42-43, DOI: 10.11646/zootaxa.3756.1.1, http://zenodo.org/record/503313
Characteristics and trends of grassland degradation research
No full textPurpose Grasslands are the largest type of terrestrial ecosystem on the earth, providing rich and unique ecosystem services.
However, climate change and human activities have triggered a global degradation of grasslands, which has become a major
ecological crisis. In this study, a scientometric analysis was performed to explore the hotspots and frontiers of global grassland
degradation research.
Materials and methods Two methods involving visualization were used to analyze these data: document co-citation analysis
and burst analysis based on the papers indexed in the Web of Science (WOS) during 1970–2020.
Results and discussion A total of 3580 research papers related to grassland degradation research and 54,666 references were
included. The results showed that Harris’s paper in 2010 had the strongest burst value of 26.2, far larger than any other,
which shows that this paper was a turning point in the research process. The document co-citation network was divided into
14 main theme clusters. The most influential and emerging research theme clusters were including alpine meadow, grazing
exclusion, alpine region, and human activities. Alpine meadow was the largest cluster lasting from 2010 to 2020, indicating
that this topic is still active in grassland degradation research. Furthermore, research focus has transferred toward grasslands
in Qinghai-Tibetan Plateau. The topic of grazing exclusion is both classic and currently active as it lasted as a research hotspot
for 15 years (2004–2018). However, the extent and state of grazing effects research are unclear.
Conclusions As the first scientometric review on grassland degradation research, our study identified the research hotspots
and their shifts over the past 50 years, pointing to some potential research frontiers in the future. The scientometric analysis
is a useful tool for a quantitative evaluation of research hotspots and trends of global grassland degradation
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