380 research outputs found
Salvia changchuniana B. Y. Ding, Z. H. Chen & X. F. Jin 2023, sp. nov.
No full text<p> <b>Salvia changchuniana</b> B.Y. Ding, Z.H. Chen & X.F. Jin, <i>sp. nov.</i> Figs. 2 & 3</p> <p> This new species is similar to <i>S. liguliloba</i> Sun in having cauline leaves 3‒5-paired, simple, verticillasters extending to one side, but differs from the latter by having wider leaves, cauline leaf blade ovate-elliptic, ovate or broadly ovate, 10–20 cm long, 6–12 cm wide, corolla shorter, 1.3–1.5 cm long, tube outside densely pubescent, limb villous and glandular externally, middle lobe of lower lip compressed rounded-spathulate, larger than lateral lobes, ca. 3 mm long, ca. 2.5 mm wide, margin praemorse.</p> <p> <b>TYPE:</b> CHINA. Zhejiang: Fenghua, Chunhu, Jiufengshan, 106°23′28.85″E, 23°44′29.95″N, base of hill along stream, elev. 115 m, 10 Jun. 2019, <i>B. Y. Ding & Z. H. Chen 16357</i> (holotype: ZM; isotypes: IBK, ZJFC, ZM).</p> <p>Herbs perennial. Roots pale yellow-brown. Stems 50‒120 cm tall, unbranched, 4-angled, longitudinally grooved, densely recurved pubescent and sparsely spreading villous. Leaves simple, opposite. Basal leaves long-petiolate; petioles 5‒10 cm long; blades ovate-elliptic, ovate-oblong or broadly ovate, 7‒13 cm long, 4‒9 cm wide, apex obtuse, base shallowly cordate, margin crenate, adaxially green, abaxially purple-red, short-hispid on veins of both surfaces. Cauline leaves 3‒5-paired; petioles 3‒12 cm long; blades ovate-elliptic, ovate or broadly ovate, 9.5‒13(‒20) cm long, 4.5‒7(‒12) cm wide, apex acute or short-acuminate, base shallowly cordate, with same indumentum of basal leaves, adaxially dark green, abaxially pale green. Upper leaves short-petiolate or subsessile; blades smaller, ovate or ovate-lanceolate, apex acuminate, base rounded or truncate. Verticillasters 4‒8-flowered, in a terminal or axial 10‒30 cm long sub-racemes, extending to one side, sometimes base branched; lateral inflorescence with a 6‒10 cm long peduncle; rachis densely recurved pubescent and glandular. Calyx narrowly campanulate, ca. 7 mm long, glandular, sparsely hispid on veins, glabrous inside; posterior lip erect, obovate-elliptic, apex 3-lobed with minute teeth; anterior lip 2- lobed, lobes lanceolate. Corolla 1.3‒1.5 cm long, tube pale purple or white-purple, densely pubescent and glandular outside, obliquely pilose annulate near base inside, limb purple or white-purple, 2-lipped; posterior lip straight, ca. 2.5 mm long, 2-lobed; anterior lip horizontally spreading, ca. 5 mm long, 3-lobed, lateral lobes obliquely ovate-triangular, middle lobe spathulate, upper amplified to compressed round-spathulate, ca. 3 mm long, ca. 2.5 mm wide, margin praemorse, villous and glandular outside, sparsely pubescent inside. Fertile stamens 2; filaments ca. 2 mm long; connectives arcuate, villous, upper arms ca. 5 mm long; lower arms separated, ca. 2 mm long; anthers black-brown, ca. 2 mm long. Ovary ellipsoid, ca. 0.8 mm long, green; style ca. 14 mm long, glabrous; stigma 2.</p> <p> <b>Etymology</b>: The specific epithet ‘ <i>changchuniana</i> ’ is in honor of Prof. Chang-Chun Wu (1905‒1974), who was the founder of Herbarium of Zhejiang University (HZU) and devoted himself to the taxonomic study on the ferns and seed plants of Zhejiang Province.</p> <p> <b>Phenology</b>: Flowering and fruiting occurs from late May to mid-June.</p> <p> <b>Additional specimens examined</b>: CHINA. Zhejiang: Fenghua, Chunhu, Jiufengshan, base of hill along stream, elev. 118 m, 4 Jun. 2019, <i>B. Y. Ding & K. X. Lu 16355</i> (ZM); the same locality, introduced in Hangzhou, 6 Jun. 2019, <i>B. Y. Ding 16356</i> (ZM); Longtangshan, elev. 336 m, ravine forests, 10 Jun. 2019, <i>B. Y. Ding & Z. H. Chen 16359</i> (HHBG, HZU, ZM, ZJFC); the same locality, introduced in the campus of Jiyang College in Zhuji, 28 May 2019, <i>Y. L. Xu & B. Y. Ding Xu1322</i> (ZM).</p> <p> <b>Conservation status</b>: Near threatened(NT).The new species is currently known from the type locality, Jiufengshan in Fenghua County in the city of Ningbo in eastern Zhejiang and grows along a stream in forests. The habitat is declining because of human disturbance (IUNC 2019).</p>Published as part of <i>Jin, Xiao-Feng, Ding, Bing-Yang, Chen, Zheng-Hai, Xu, Yue-Liang & Lu, Kai-Xing, 2023, Salvia changchuniana (Lamiaceae), a new species from Zhejiang, East China, pp. 288-294 in Phytotaxa 616 (3)</i> on pages 292-293, DOI: 10.11646/phytotaxa.616.3.8, <a href="http://zenodo.org/record/10145547">http://zenodo.org/record/10145547</a>
Data assimilation in air pollution modelling
No full textElectrical Engineering, Mathematics and Computer Scienc
Magnetoelastic Coupling in Mn-Fe-P-Si Compounds
No full textMn-Fe-P-Si compounds are, to date, the most promising materials for refrigeration and energy conversion applications due to the combination of giant magnetocaloric effect (GMCE) and low material cost. The nature of magneto-elastic transition was studied on both length- and time-scales using neutron diffraction, muSR and Mӧssbauer spectroscopy techniques for Mn-Fe-P-Si compounds. The revealed strong spin-lattice coupling is responsible for the different magnetic orders, the tunability of the phase transition, and the excellent magnetocaloric properties in these compounds. This thesis contributes to a better understanding of the spin-lattice coupling and phase-transition behavior for Mn-Fe-P-Si compounds
Growth and Characterisation of Boron Rich Nanomaterials
No full textIn this study nanomaterials are grown in a solid state reaction at 1300C of boron, barium oxide and iron(II/III)oxide powders in an argon atmosphere. The nanomaterials are shown to be grown via vapour based method by growing the nanomaterials on a separate silicon wafer that has been sputtered with iron and placed downstream of the powders in the flow of argon. An area of the silicon wafer is kept free of iron by using a mask when sputtering the wafer. When nanomaterials are grown, the masked area remains free of nanomaterials. This shows that the presence of iron is vital for the nucleation of the nanomaterials and also indicates the possibility of growing these nanomaterials on targeted sites.
The nanomaterials produced are examined and it is found that we have a presence of amorphous, crystalline and multiple twinned nanowires. The evidence collected suggests that 70% of the nanowires are twinned. The single crystal nanowires can be identified as boron carbide by comparing to diffraction pattern simulations of a boron carbide unit cell. The twinned diffraction pattern is shown to be due to different segments of the nanowire being in different diffraction condition by using Dark Field imaging. The Twinned wires are also shown to have at least four segments in a cyclic [001] twinning orientation in simultaneous diffraction condition by comparing to a twinned structure constructed from simulations. Elemental analysis using Electron Energy Loss Spectroscopy and Energy Dispersive X-ray shows that the composition of the nanomaterials is mainly boron and carbon.
The role of the iron layer on the wafer is investigated to see how varying the thickness will affect the nanomaterials grown. It is successfully shown that an increase in the thickness of the iron layer results in a greater density of nanomaterials. However there is no great variation in the average diameter of the nanomaterials produced.
The absence of a visible signal for iron in the Elemental analysis of nanostructure covered silicon wafer shows that the amount of iron in the sample has decreased during the reaction. However iron is found in small amounts in droplet structures at the tips of nanomaterials this is different to work done on a similar system at 1100C. This suggests that the role of the iron in the growth of these nanomaterials at this temperature is not yet understood. However this work has confirmed that the iron is essential for the nucleation of the nanomaterials, but post nucleation growth that was previously assumed to be a conventional VLS growth may switch to an oxide assisted growth mode
SCI citation analysis and impact factor prediction of JZUS-B in 2008
No full textWe analysis the SCI citation of Journal of Zhejiang University-SCIENCE B, predict its 2008 Impact Factor in the range of 0.737~0.915, and list the top-10 SCI cited articles
Ground station user interface and data link: An implementation for unmanned aerial vehicles
No full textResearch on unmanned aerial vehicles (UAVs) has steadily increased over the last decades due to the wide range of military, civil and security applications. Within the larger framework of aerial vehicles, the high degree of autonomy of UAVs places constraints on data communication links. Many existing UAV systems include ground stations which allow users to retrieve data from the airborne unit during flight. Air-to-ground connections have been successfully implemented for both low data rates and high-capacity links. A broad variety of UAV applications therefore appears to be feasible. This thesis proposes a possible implementation of a graphical user interface and a ZigBee-based air-to ground communication link for sensor and graphical data transfer. This design is part of a ground vehicle tracking system for UAVs.Electronics Research LaboratoryMicroelectronicsElectrical Engineering, Mathematics and Computer Scienc
Structure – Property relationships for nanofluids
No full textThis paper was presented at the 3rd Micro and Nano Flows Conference (MNF2011), which was held at the Makedonia Palace Hotel, Thessaloniki in Greece. The conference was organised by Brunel University and supported by the Italian Union of Thermofluiddynamics, Aristotle University of Thessaloniki, University of Thessaly, IPEM, the Process Intensification Network, the Institution of Mechanical Engineers, the Heat Transfer Society, HEXAG - the Heat Exchange Action Group, and the Energy Institute.Nanofluids refer to dilute liquid suspensions of nanoparticles in commonly used heat transfer liquids. They triggered much excitement since mid 1990s mainly owing to the claims of anomalous enhancement of thermal conductivity even at very low nanoparticle concentrations. There have been
numerous attempts to interpret the mechanism(s) that drive the displayed enhancement. A long debate within the research community supported by experimental and theoretical evidence has highlighted the nanoparticle
structuring as the dominant underlying mechanism. On the other hand the viscosity increase as a result of nanoparticle structuring raises concerns about their suitability for certain applications. This paper mainly discusses the structure – property relationship for nanofluids in microscopically static conditions
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In-plane magnetic anisotropy of bcc Co on GaAs 001
No full textY. Z. Wu, H. F. Ding, C. Jing, D. Wu, G. L. Liu, V. Gordon (currently with UT Austin), G. S. Dong, and X. F. Jin are with
Fudan T. D. Lee Physics Laboratory and Surface Physics Laboratory, Fudan University, Shanghai 200433, China -- S. Zhu and K. Sun are with the
Beijing Laboratory of Electron Microscopy, Chinese Academy of Science, and Department of Material Engineering,
Dalian University of Technology, Dalian, ChinaEpitaxial growth of Co on GaAs(001) and its in-plane magnetic anisotropy are studied using reflection
high-energy electron diffraction, a high-resolution transmission electron microscope, and the magneto-optical
Kerr effect. In the initial and final stages of growth, Co exists in single-crystalline body-centered-cubic (bcc)
and hexagonal-closed-packed (hcp) phases, respectively, while in the middle stage the coexistence of the bcc
and hcp structures is observed. For the bcc Co thin films on GaAs(001), a fourfold in-plane magnetic anisotropy
with easy axes along the <100> directions is realized and discussed.Chemistr
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