97,145 research outputs found
Dataset for: Widely-tunable synchronisation-free picosecond laser source for multimodal CARS, SHG and two-photon microscopy
No full textThis dataset supports the publication: Xu, D, Price, J, Xu, L & Richardson, 'Widely-tunable synchronisation-free picosecond laser source for multimodal CARS, SHG and two-photon microscopy', Biomedical Optics Express. https://doi.org/10.1364/BOE.411620</span
B->Xs,d gamma and B->Xs,d l+l-
No full textFlavour Changing Neutral Current transitions B
→ Xs/d γ and B → Xs/d l
+
l − provide an excellent
laboratory for the search for physics beyond the Standard Model and for the study of the dynamics
of b-quark inside B mesons.
B
→ Xs/d γ and B → Xs/d l
+
l − decays are selected from the samples of events collected by the
BaBar, Belle and CDF detectors by means of several strategies.
Standard Model tests are performed through measurements of inclusive BR(B
→ Xs/d γ ), BR(B →
Xs/d l +l −), CP and isospin asymmetries, and the study of the relevant angular distributions in
B
→ Xs/d l
+
l − decays.
A
|Vt d /Vt s | measurement with reduced theoretical uncertainties is obtained from the branching
fraction ratio BR(b
→ d γ )/BR(b → sγ ).
The most precise
|Vcb | determination is extracted by global fits to the moments of inclusive dis-
tributions in B
→ Xc l ν and B → Xs γ using the kinetic mass scheme. Uncertainties on shape
functions in the measurement of
|Vub | using inclusive semileptonic decays B → Xu l ν are limited
by comparing the partial rates for B
→ Xu l ν and B → Xs γ in restricted phase space regions
First observation of B → D ̄_1 (→ D ̄ π+π-) l+ν l and measurement of the B → D ̄(∗) π l+ νl and B → D ̄(∗) π+ π- l+ νl branching fractions with hadronic tagging at Belle
No full textWe report measurements of the ratios of branching fractions for B→D ̄(∗)πl+νl and B→D ̄(∗)π+π-l+νl relative to B→D ̄∗l+νl decays with l=e, μ. These results are obtained from a data sample that contains 772×106BB ̄ pairs collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric energy e+e- collider. Fully reconstructing both B mesons in the event, we obtain B(B0→D ̄0π-l+νl)B(B0→D∗-l+νl)=(7.23±0.36±0.14)%, B(B+→D-π+l+νl)B(B+→D ̄∗0l+νl)=(6.78±0.24±0.18)%, B(B0→D ̄∗0π-l+νl)B(B0→D∗-l+νl)=(11.10±0.48±0.23)%, B(B+→D∗-π+l+νl)B(B+→D ̄∗0l+νl)=(9.50±0.33±0.34)%, B(B0→D-π+π-l+νl)B(B0→D∗-l+νl)=(2.91±0.37±0.26)%, B(B+→D ̄0π+π-l+νl)B(B+→D ̄∗0l+νl)=(3.10±0.26±0.22)%, B(B0→D∗-π+π-l+νl)B(B0→D∗-l+νl)=(0.99±0.43±0.20)%, B(B+→D ̄∗0π+π-l+νl)B(B+→D ̄∗0l+νl)=(1.25±0.27±0.15)%, where the uncertainties are statistical and systematic, respectively. These are the most precise measurements of these branching fraction ratios to date. The invariant mass spectra of the Dπ, D∗π, and Dππ systems are studied, and the branching fraction products B(B0→D2∗-l+νl)×B(D2∗-→D ̄0π-)=(0.157±0.015±0.005)%, B(B+→D ̄0∗0l+νl)×B(D ̄0∗0→D-π+)=(0.054±0.022±0.005)%, B(B+→D ̄2∗0l+νl)×B(D ̄2∗0→D-π+)=(0.163±0.011±0.008)%, B(B0→D1-l+νl)×B(D1-→D ̄∗0π-)=(0.306±0.050±0.029)%, B(B0→D1′-l+νl)×B(D1′-→D ̄∗0π-)=(0.206±0.068±0.025)%, B(B0→D2∗-l+νl)×B(D2∗-→D ̄∗0π-)=(0.051±0.040±0.010)%, B(B+→D ̄10l+νl)×B(D ̄10→D∗-π+)=(0.249±0.023±0.015)%, B(B+→D ̄1′0l+νl)×B(D ̄1′0→D∗-π+)=(0.138±0.036±0.009)%, B(B+→D ̄2∗0l+νl)×B(D ̄2∗0→D∗-π+)=(0.137±0.026±0.009)%, B(B0→D1-l+νl)×B(D1-→D-π+π-)=(0.102±0.013±0.009)%, B(B+→D ̄10l+νl)×B(D ̄10→D ̄0π+π-)=(0.105±0.011±0.009)%, are extracted. This is the first observation of the decays B→D ̄1l+νl with D1→Dπ+π-
Preparation, Foaming and Characterization of Poly(l-lactic acid))/Poly(d-lactic acid)-Grafted Graphite Oxide Blends
No full textCommercial poly(l-lactic acid) (PLLA) was blended with different contents of graphene oxide-graft-poly(d-lactic acid) (GO-g-PDLA), which was synthesized via ring-opening polymerization using modified GO as initiator. PLLA and PLLA/GO-g-PDLA blend foams were prepared in a batch process via varying-temperature mode using supercritical carbon dioxide as physical foaming agent. The results showed that the addition of GO-g-PDLA in PLLA leads to the formation of stereocomplex (sc)-crystallites. Increase in the GO-g-PDLA content enhances the IR absorption, diffraction peak and melting peak corresponding to the sc-crystallites. The addition of GO-g-PDLA to PLLA leads to the decrease of the cell diameter, increase of the cell density and to a little change in expansion ratio, which is attributed to the fact that the enhancement of PLLA crystallization restricts cell growth and GO-g-PDLA acts as nucleation point
Arxiella longispora Yue Xu, T. Qiu, S. Gao, W. Meng & L. J. Xu. 2023, sp. nov.
No full text<i>Arxiella longispora</i> Yue Xu, T. Qiu, S. Gao, W. Meng & L.J. Xu. <i>sp</i>. <i>nov</i>. (FIGURE 3) <p>Mycobank No.: MB838820</p> <p> <b>Type:</b> — CHINA. HEILONGJIANG: Greater Hinggan Mountains, 52.33°N, 124.7°E, alt. Ex leaves <i>(Populus davidiana</i>., <i>Betula platyphylla</i>, <i>Larix gmelinii</i>. and <i>Pinus Sylvestris</i>) litter (MEFL706), 10 Oct, 2017, J. Liang, B. Liu, W. Meng, Q. Wang & L. Xu, HMPHU 1245 (holotype). Ex-type living culture CCTCC M 2021101 (SGSF 303). GenBank: ITS = MT 921658; LSU = MW 519910; <i>rpb2</i> = MW 717995; <i>tef1</i> = MW 883564.</p> <p> <i>Colonies</i> on PDA, and MEA, reaching 22.00– 22.33 mm after 12 d, smooth, velvet, firstly off-white hyphae, becoming grayish-brown on PDA or grayish-green on MEA after 1 wk; reverse amber, with off-white, smooth, even margin; exudate clear. <i>Colonies</i> on OA reaching 22.00 mm after 12 d, smooth with white hyphae, light yellow to light brown plaques; aerial hyphae sparse, with wavy edge after 3 wk; reverse milk white (Fig. S1). <i>Colonies</i> on CMA reaching 16 mm after 12 d; aerial hyphae dense, becoming grayish towards the outside with black secretions; reverse dark gray (FIGURE S1).</p> <p> <i>Hyphae</i> septate, branched, hyaline to brown, 1.5–5 μm diam. <i>Conidiophores</i> filamentous, smooth, unbranched, or dichotomously branched, ovoid, clavate, cylindrical or irregular. <i>Conidia</i> (13–)14–22(–24) × 3–4 μm (x̄ = 17.8 × 3.5 μm, n = 100), reniform or cylindrical, hyaline, smooth, guttulate, solitary or occasionally interconnected, medianly 1-septate or no septate, inner plane with apical and basal horn-like appendages, with or without a slightly raised hilum near the base of one of the appendages. <i>Chlamydospores</i> absent. <i>Sexual morph</i> absent.</p> <p>The optimal temperatures for the colony growth of SGSF 303 on PDA were in the range of 20 ℃ to 25 ℃ where the colony reached around 22 mm diam. in 12 d (FIGURE S2). Growth rates were similar between pH 5 and 10 on PDA for 12 d, but at the pH 4 the fungus had significantly reduced growth speed (5.67 mm, FIGURE S2).</p> <p> <b>Diagnosis:</b> — <i>Colonies</i> grayish brown on surface; <i>conidiophore</i> hyaline, dichotomously branched; <i>conidia</i> up to more than 20 μm long, hyaline, reniform or cylindrical, inner plane with apical and basal horn-like appendages, medianly 1-septate.</p> <p> <b>Etymology:</b> —Referring to its long spores.</p> <p> <b>Habitat:</b> —Forest litters.</p> <p> <b>Known Distribution:</b> —Greater Hinggan mountains, Heilongjiang province, China.</p> <p> <b>Additional isolates examined:</b> — CHINA, Heilongjiang province, Maoershan, leaves (<i>Populus davidiana</i>, <i>Betula platyphylla</i>) litter and soil, September 2018, Siyu Gao SGSF411, <i>ibid.</i> SGSF573.</p> <p> <b>Notes:</b> — <i>Arxiella longispora</i> is distinct from three asexual morphs in <i>Arxiella</i>, <i>A. dolichandrae</i>, <i>A. lunata</i>, and <i>A. terrestris</i>, by having longer conidia (up to 24 μm long) with a larger length-to-width ratio (>5) (TABLE 2). The closest taxa of <i>A. longispora</i> is <i>A. terrestris</i> based on the similarity of different DNA sequences. The ITS, <i>rpb2</i> and <i>tef1</i> sequences of <i>A. longispora</i> showed 97.73%, 94.42%, and 98.61% similarity to <i>A. terrestris</i>, respectively (TABLE S2). Morphologically, <i>A. longispora</i> is closer to <i>A. terrestris</i> and <i>A. dolichandrae</i> due to shape of the conidia which have a straight inner side. In comparison, <i>A. lunata</i> has conidia with a curved inner side. The black-brown colonies of <i>A. longispora</i> on PDA was different with <i>A. terrestris</i>, which shows black-green colonies on PDA. In addition, <i>A. longispora</i> produces unique conidia as mentioned above, but <i>A</i>. <i>celtidis</i> as the only sexual morph do not produce any asexual morph in the culture.</p>Published as part of <i>Xu, Yue, Du, Tingting, Liu, Yao, Qiu, Tianyi, Gao, Siyu, Meng, Wei & Xu, Lijian, 2023, Arxiella longispora (Muyocopronaceae), a new fungal species from forest litters in Northeast China, pp. 160-168 in Phytotaxa 616 (2)</i> on pages 164-166, DOI: 10.11646/phytotaxa.616.2.5, <a href="http://zenodo.org/record/8389607">http://zenodo.org/record/8389607</a>
Pulsatilla saxatilis L. Xu & T. G. Kang 2022, sp. nov.
No full textPulsatilla saxatilis L. Xu & T.G. Kang, sp. nov., Figs. 1–3. Type:— CHINA. Liaoning, Fengcheng, Baiyun Mountain, on rocky cliffs, ca. 1100 m, 26 May 2015, L. Xu et al. 210682150526013 LY (holotype LNCM, isotypes IFP, IMD, LNCM, PE). Fig. 1. Diagnosis: From its putative closest ally, Pulsatilla chinensis (Fig. 4), the new species P. saxatilis is distinguishable by having light blue, whitish-blue or white (vs. violet) sepals and persistent styles 2–2.5 cm (vs. 3.5–6.5 cm) long (see Table 1). Description:—Perennial herb, 9–20 cm tall. Rhizome 0.5–1 cm in diameter. Basal leaves 6–11, leaf blade ovate, 2–3.5 × 1.5–3 cm, 3–foliolate or ternate-pinnate. Central leaflet long petiolulate, 0.5–2 cm long, cordate, 3–foliolate, central segment stipitate and deeply 3–lobed, ultimate lobes cuniform, 0.3–0.6 cm wide, apically 2–or 3–toothed, abaxially sparsely long pilose, adaxially glabrous; petiole 2–7.5 cm, densely white villose. Scapes solitary or 2, occasionally 3, erect, white villose. Involucral bracts 3 or 4, 1– 2.4 cm long, connate and tubular at base, apically palmately 3–lobed, apical palmate lobes lanceolate, abaxially densely long pilose. Flowers solitary, erect, 2–4 cm in diameter; sepals 6–11, light blue, whitish–blue or white, oblong-ovate, 1.5–2.5 × 0.4–1.4 cm, abaxially puberulent; stamens numerous, ca. 1/2 as long as sepals; carpels numerous, style yellow-green, stigma pale violet. Achenes 2.5–3 mm long, long pilose. Persistent styles 2–2.5 cm long, sparsely long pilose. Phenology:—Flowering in May; fruiting in June. Pollen morphology:—Pollen grains of Pulsatilla saxatilis are spheroidal and pantoporate, having 9–12 apertures (Fig. 5A, B). The pollen surface is rough and spinulate, and the spinules are unevenly distributed. The bases of the spinules are cushion-like, and the tops are acuminate. The spinules in the apertures are larger than those on the surface. In its putative closest ally, P. chinensis, pollen grains are tricolpate (Fig. 5C, D). Pollen morphology, therefore, lends strong support for the description of P. saxatilis as new. Distribution and habitat:— Pulsatilla saxatilis is currently known only from its type locality, i.e. Baiyun Mountain in Fengcheng, Liaoning province, north-east China (Fig. 6). It grows on rocky cliffs at an altitude of ca. 1100 m. Etymology:—The specific epithet, “ saxatilis ”, which means “dwelling or found among rocks”, refers to the habitat of the new species. Additional specimens examined (paratypes):— CHINA. Liaoning, Fengcheng, Baiyun Mountain, ca. 1100 m, on rocky cliffs, 22 May 2016, L . Xu et al. 210682160522032 LY (PE); the same locality, 22 May 2016, L . Xu et al. 210682160522032 LY (IFP, IMD, LNCM). Conservation status:— Pulsatilla saxatilis is currently known only from its type locality, with its distribution area being very small, although the population we observed in 2015 consisted of numerous individuals, and the habitat was in good condition, not disturbed by human activities. The conservation status of P. saxatilis may better be considered as “Endangered” (IUCN Standards and Petitions Committee 2019).Published as part of Zhang, Ting-Ting, Zhang, Shu-Mei, Xu, Liang & Kang, Ting-Guo, 2022, Pulsatilla saxatilis (Ranunculaceae), a new species from north-east China, pp. 195-202 in Phytotaxa 539 (2) on pages 195-200, DOI: 10.11646/phytotaxa.539.2.6, http://zenodo.org/record/635819
Dataset for High beam quality, watt-level, widely tunable, mid-infrared OP-GaAs optical parametric oscillator
No full textData supporting the publications: Fu, Q., Xu, L., Liang, S., Shardlow, P., Shepherd, D., Alam, S-U., & Richardson, D. (Accepted/In press). High beam quality, watt-level, widely tunable, mid-infrared OP-GaAs optical parametric oscillator. Optics Letters. </span
Istiochrysis Rosa & Xu, gen. nov.
No full textIstiochrysis Rosa & Xu, gen. nov. (Figs 1 A– 1 F, 2 A– 2 D, 3 A– 3 D, 4 A– 4 F) Type species: Istiochrysis ziliolii Rosa, Feng & Xu, sp. nov. Diagnosis. Istiochrysis Rosa & Xu, gen. nov. is similar to the Nearctic and Neotropical genus Caenochrysis Kimsey & Bohart, 1981, and the Palaearctic and Oriental genera Chrysidea Bischoff, 1913 and Trichrysis Lichtenstein, 1876. However, this new genus can be separated from Caenochrysis, Chrysidea and Trichrysis by male genitalia with extended longitudinal crest on aedeagus (Figs 1 A– 1 C); apex of aedeagus enlarged and folded laterally (Figs 1 A, 1 B) (not enlarged in the other genera and tapering in Caenochrysis); facial fovea between antennal socket and lower margin of eye hardly visible and shallowly depressed and finely punctate (Figs 2 A, 2 B) (usually deeply depressed in Caenochrysis); pronotum without sublateral carina (Fig. 3 A) (usually with sublateral carina in Trichrysis); fore wing discoidal cell with thin and completely sclerotised outer vein (faint in Chrysidea); apex of T 3 without teeth (laterally dentate and medially undulate in Chrysidea, tridentate in Trichrysis); S 2 with large, subrectangular, black spots extending to lateral margins (Fig. 3 B), somehow similar to those in the genus Praestochrysis Linsenmaier, 1968 (small, suboval, not extending to lateral margins in Caenochrysis; suboval and separated in Chrysidea (Fig. 3 D), subtriangular and medially fused or nearly so in Trichrysis (Fig. 3 C)) (Bohart & Kimsey 1982; Linsenmaier 1984; Rosa & Xu 2015; Rosa et al. 2016 a) (Fig. 2 D). Description. Male. Head broader than high. Scapal basin with shallow depression on each side between antennal socket and lower margin of eye; depression visible only under certain angle (Figs 2 A, 2 B); bottom of depression filled with micro-punctures and densely setose. Scapal basin topped by TFC (Figs 2 A, 4 B); scapal basin with white setae, especially along lateral sides (Fig. 2 A). F 1 l/w> 3; MS= 1 MOD. Genal carina developed from gena to mandible. Subgenal area well defined. Median ocellus not lidded. Vertex without posterior depression beneath posterior ocellus. Mandible unidentate. Pronotum nearly as long as mesoscutellum with deep lateral depression, without sublateral carina. Mesopleuron with large episternal sulcus and scrobal sulcus (Fig. 4 D); area between episternal sulcus and scrobal sulcus large and subtriangular. Metanotum with raised median area. Fore wing with thin but completely sclerotized outer veins of discoidal cell (Fig. 3 A). T 2 and T 3 with shallow median longitudinal carinae (Fig. 4 E). Apex of T 3 without teeth, but with shallow concavity, thus appearing bilobate (Fig. 4 F); pit row well developed with enlarged and partly fused pits (Fig. 4 F). Black spots on S 2 elongate, fused along lateral margins (Fig. 3 B) and distinctly separated mesally. Male genitalia with gonostyle of gonocoxa elongate and slender, aedeagus with enlarge longitudinal crest, well visible in lateral view (Fig. 1 C). Female. Unknown. Biology. Unknown. Distribution. China (Yunnan). Etymology. From Greek noun istion (= sail), referring to the unique subsidiary structure longitudinally placed on aedeagus, looking like a sail in lateral view. The gender is feminine.Published as part of Rosa, Paolo, Feng, Jun & Xu, Zai-Fu, 2016, Istiochrysis gen. nov., a new chrysidid genus from Oriental China (Hymenoptera, Chrysididae), pp. 591-597 in Zootaxa 4111 (5) on page 592, DOI: 10.11646/zootaxa.4111.5.5, http://zenodo.org/record/26366
Application of the Tikhonov tomography method for the gas electron multiplier (GEM) system on experimental advanced superconducting tokamak
No full textA novel GEM (Gas Electron Multiplier) system has been installed on experimental advanced superconducting tokamak (EAST) which is used for collecting the line integral of the soft X-ray radiation (SXR) through a pinhole-collimated Beryllium window. The sightline of the 2-D GEM system is tangential to the toroidal field. To obtain the local SXR emission, the Tikhonov algorithm is applied for the imaging of the poloidal cross section emission in the vacuum vessel. In the meanwhile, the L-curve method is used to find an optimized solution of the regularization parameters. The tomography reliability has been tested with a known emission function where the error is also discussed. The tomography method has been coded as a graphic user interface for the fast analysis of GEM experimental data. The typical tomography results have been shown for the EAST shot (#79282) in this paper
Elastic electromagnetic form factors of vector mesons
No full textA symmetry-preserving approach to the two valence-body continuum bound-state
problem is used to calculate the elastic electromagnetic form factors of the
-meson and subsequently to study the evolution of vector-meson form
factors with current-quark mass. To facilitate a range of additional
comparisons, form factors are also computed. The analysis reveals
that: vector mesons are larger than pseudoscalar mesons; composite vector
mesons are non-spherical, with magnetic and quadrupole moments that deviate
% from point-particle values; in many ways, vector-meson properties
are as much influenced by emergent mass as those of pseudoscalars; and vector
meson electric form factors possess a zero at spacelike momentum transfer.
Qualitative similarities between the electric form factors of the and
the proton, , are used to argue that the character of emergent mass in
the Standard Model can force a zero in . Morover, the existence of a
zero in vector meson electric form factors entails that a single-pole vector
meson dominance model can only be of limited use in estimating properties of
off-shell vector mesons, providing poor guidance for systems in which the
Higgs-mechanism of mass generation is dominant
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