47,329 research outputs found
Molecular Insight into Microstructural and Dynamical Heterogeneities in Magnesium Ionic Liquid Electrolytes
No full textIonic liquids (ILs) are promising designer solvents for multivalent electrolytes, enabling the modulation of molecular-level interactions of solvate species. The molecular mechanism of multivalent-ion clustering and its impact on electrolytes properties is far less studied than that of ion pairs. Herein, we explore the effect of ion clusters on the transport and electrochemical behavior of IL-based electrolytes for Mg batteries. Simulation and small-angle X-ray scattering results indicate that ILs with higher denticity effectively suppress ion agglomeration and parasitic reactions of the Mg electrolytes. Although ion clustering reduces the diffusivity of Mg2+, the Coulombic efficiency for the reversible Mg deposition/stripping process is improved, highlighting the importance of microstructural and dynamical heterogeneities in the rational design of enhanced multivalent electrolytes
Datasets for the data collection method and examples of the material flows at city level
No full textTwo excel files serve as the datasets for the publication “H. Gao et al., 2021. Standardized method for material flow data collection at city level, Data in Brief.” It provided the detailed instructions of how to use the standardized method to obtain the material flow data with the general data sources at city level. For the application of this method in case of 16 cities in Shandong Province, China, as well as more illustrations of the results based on these datasets of the material flows, they can be found in the publication “H. Gao, X. Tian, Y. Zhang, L. Shi, F. Shi, 2021. Evaluating circular economy performance based on ecological network analysis: A framework and application at city level. 105257. Resources, Conservation & Recycling,https://doi.org/10.1016/j.resconrec.2020.105257.
A 2 h periodic variation in the low-mass X-ray binary Ser X-1
No full textSpectroscopy of the low-mass X-ray binary Ser X-1 using the Gran Telescopio Canarias have revealed a ?2 h periodic variability that is present in the three strongest emission lines. We tentatively interpret this variability as due to orbital motion, making it the first indication of the orbital period of Ser X-1. Together with the fact that the emission lines are remarkably narrow, but still resolved, we show that a main-sequence K dwarf together with a canonical 1.4 M? neutron star gives a good description of the system. In this scenario, the most likely place for the emission lines to arise is the accretion disc, instead of a localized region in the binary (such as the irradiated surface or the stream-impact point), and their narrowness is due instead to the low inclination (?10°) of Ser X-1
Three New Species of Indigofera (Leguminosae) from China
No full textThree new species of Indigofera L (Leguminosae) are described from Sichuan and Yunnan provinces in China. Indigofera shipingensis X. F. Gao, known only from a single specimen collected in 1961 from Shiping County, Yunnan, has unifoliolate leaves and is most similar to L caloneura Kurz from southern Yunnan and Southeast Asia. Indigofera megaphylla X. F. Gao, described from Yuanjiang County and also endemic to neighboring Shilling County in southern Yunnan, resembles I. dichroa Craib and I. balfourians Craib from western to northern Yunnan, Sichuan, and southern Xizang, although these two species have much smaler leaflets. Indigofera pseudoheterantha X. F. Gao & Schrire is described from Sichuan County and occurs from the Daocheng to Miyi counties in Southwestern Sichuan to the Zhongdian region of northwestern Yunnan, and appears closely related to I. heterantha Wallich ex Brandis from northwestern Yunnan to southern Xizang, westward to the Himalayas
Rubus neohunanensis X. H. Xiong & X. F. Gao 2022, nom. nov.
No full textRubus neohunanensis X. H. Xiong & X. F. Gao, nom. nov. (Fig. 1: B) ≡ R. buergeri Miquel (1867: 36) var. viridifolius Handel-Mazzetti (1933: 497). Type:— CHINA. Hunan: Wukang [Wugang], Yun-schan [Yunshan], Tempel Gwanyin-go [Guanyin Temple], 1190 m, 13 July 1918, Handel-Mazzetti 12289 (holotype WU!; isotypes A!, E!). — R. hunanensis auct. non Handel-Mazzetti (1933: 497): Lu & Yu (1985: 171), Lu & Boufford (2003: 258). Etymology: —The specific epithet is derived from the prefix neo-, meaning new, and hunanensis, the epithet of HandelMazzetti (1933), meaning Hunan Province of China. Distribution: —The species is endemic to China, occurring in Chongqing, Guizhou, Guangxi, Guangdong, Hunan, Hubei, Jiangxi, Fujian, Zhejiang. It was observed to grow in montane valleys, forests and grasslands at elevations from 300 m to 2500 m. Notes: — Rubus neohunanensis is morphologically similar to R. buergeri Miquel (1867: 36) (Fig. 1: D) in shrubs low, climbing or prostrate, leaves abaxially tomentose and gradually deciduous. However, R. neohunanensis can be distinguished from R. buergeri by the following morphological characters: branchlets, petioles and inflorescences thinly pubescent (vs. tomentose-villous); sepals broadly ovate (vs. lanceolate or ovate-lanceolate); outer sepals pinnate-laciniate on margin (vs. only apically lobed); leaf blade relatively larger, 8–15 cm in diam. (vs. 4–11 cm). Additional specimens examined: — CHINA. Chongqing: Wulong, C. L. Li et al. 0461 (PE). Guizhou: Qingzhen, S. W. Teng 1419 (IBSC). Guangxi: Bin long, Miu shan, R. C. Ching 6061 (PE). Damiaoshan, S. Q. Chen 14437 (IBK). Guangdong: Lechang, Nanling Exped. 4128 (IBSC). Ruyuan, Z. Huang 44050 (IBSC). Hunan: Sangzhi, L. Q. Li 128 (PE). Wugang, Y. F. Deng 0034 (PE). Hubei: Xuan’en, Y. M. Wang 4807 (PE). Jiangxi: Jiujiang, Mt. Lushan, X. H. Xiong 1595 (CDBI). Fujian: Taining, X. L. Hou 90928 (AU). Wuyishan, Wuyi Exped. 00093 (PE). Zhejiang: Qingyuan, X. H. Xiong 1955 (CDBI). Wencheng, X. H. Xiong 1833 (CDBI).Published as part of Xiong, Xian-Hua & Gao, Xin-Fen, 2022, Rubus neohunanensis, a new name for a bramble taxon misidentified as R. hunanensis in previous Chinese taxonomic literature, pp. 117-120 in Phytotaxa 561 (1) on page 119, DOI: 10.11646/phytotaxa.561.1.12, http://zenodo.org/record/705276
Exploring the apparent properties and Q-markers for quality control of Cornus officinalis
No full textCornus officinalis Siebold & Zucc. has a high nutritious value and is widely used in food fields. To distinguish the quality of cornus in different areas, this research provided a new strategy for comprehensively evaluating cornus. As a result, 12 iridoid glycosides and 7 polyphenols were identified and quantified by UHPLC-Q-TOF/MS in 13 batches of samples from five different origins. Chromaticity analysis pointed out that pelargonidin-3-O-galactoside, total iridoids, and total polyphenols performed high relation with 1365*. Antioxidant activity and inhibition of α-glucosidase effect correlated with the chemical analysis suggested that iridoid glycosides and
polyphenols should represent bioactivity of total extracts. Among these compounds, loganic acid, 7-ketologanin, cornuside I, and pelargonidin-3-O-glucoside were regarded as quality markers of cornus, which displayed the highest correlation with appearance. Above all, this paper contributed to establishing standards of external character and internal components for quality control of cornus
Asian dust storm observed at a rural mountain site in southern China : chemical evolution and heterogeneous photochemistry
No full textAuthor name used in this publication: Nie, W.Author name used in this publication: Wang, T.Author name used in this publication: Xue, L. K.Author name used in this publication: Wang, X. F.Author name used in this publication: Gao, X. M.Author name used in this publication: Zhang, Q. Z.Author name used in this publication: Wang, W. X.2012-2013 > Academic research: refereed > Publication in refereed journalVersion of RecordPublishedC
Synthesis, magnetic and luminescent properties of Nd[1–x]La[x]GaO[3] (0.7 ≤ х ≤ 1.0) solid solutions
No full textNd[1–x]La[x]GaO[3] (0.7 < х < 1.0) solid solutions were synthesized by the ceramic method, their crystal structure, magnetic and luminescent properties were investigated. The solid solutions investigated behave as paramagnetics in temperature region of 5–300 K. Calculated values of Nd{3+} ion effective magnetic moment in solid solutions investigated are lower than theoretical. There probably exists „partial freezing” of orbital moment of Nd{3+} ions by the crystal field of the orthorhombically distorted perovskite structure of Nd[1–x]La[x]GaO[3] gallates. It is shown that Nd[0.1]La[0.9]GaO[3] is an efficient phosphor with IR-emission, so it is prospective for use in IR-LEDs
Synthesis, magnetic and luminescent properties of Nd[1–x]La[x]GaO[3] (0.7 ≤ х ≤ 1.0) solid solutions
No full textNd[1–x]La[x]GaO[3] (0.7 < х < 1.0) solid solutions were synthesized by the ceramic method, their crystal structure, magnetic and luminescent properties were investigated. The solid solutions investigated behave as paramagnetics in temperature region of 5–300 K. Calculated values of Nd{3+} ion effective magnetic moment in solid solutions investigated are lower than theoretical. There probably exists „partial freezing” of orbital moment of Nd{3+} ions by the crystal field of the orthorhombically distorted perovskite structure of Nd[1–x]La[x]GaO[3] gallates. It is shown that Nd[0.1]La[0.9]GaO[3] is an efficient phosphor with IR-emission, so it is prospective for use in IR-LEDs
Relations between x-ray timing features and spectral parameters of galactic black hole x-ray binaries
No full textWe present a study of correlations between spectral and timing parameters for a sample of black hole X-ray binary candidates. Data are taken from GX
339-4, H 1743-322, and XTE J1650-500, as the Rossi X-ray Timing Explorer
(RXTE) observed complete outbursts of these sources. In our study we investigate outbursts that happened before the end of 2009 to make use of the high-energy coverage of the HEXTE detector and select observations that
show a certain type of quasi-periodic oscillations (type-C QPOs). The spectral parameters are derived using the empirical convolution model simpl to model the Comptonized component of the emission together with a disc blackbody for the emission of the accretion disc. Additional spectral features, namely a reflection component, a high-energy cut-off, and excess emission at 6.4 keV, are taken into account. Our investigations confirm the known positive
correlation between photon index and centroid frequency of the QPOs and reveal an anti-correlation between the fraction of up-scattered photons and the QPO frequency. We show that both correlations behave as expected in the “sombrero”
geometry. Furthermore, we find that during outburst decay the correlation between photon index and QPO frequency follow a general track, independent of individual outbursts
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