144,112 research outputs found
Oreocharis speciosa Mich. Moller & W. H. Chen, comb. nova
No full textOreocharis speciosa (Hemsl.) Mich. Möller & W. H. Chen, comb. nova (Fig.1 A-E). Ξ Didissandra speciosa Hemsl. in J. Linn. Soc., Bot. 26: 228. 1890. Ξ Briggsia speciosa (Hemsl.) Craib in Notes Roy. Bot. Gard. Edinburgh 11: 264. 1920. Lectotypus (designated here): CHINA. Prov. Hubei (Hupeh): Hsingshan, A. Henry 6411A (K [K000858093]!; iso-: E [E00396435]!). Distribution and habitat. – Oreocharis speciosa is distributed in W Hubei (Enshi city), SW Hunan (Hongjiang county), and S Chongqing [previously E Sichuan] (Nanchuan county). The species grows on shady, damp rocks on slopes, at an altitude ranging from 300 to 1600 m. Observations. – In the protologue of Didissandra speciosa, HEMSLEY (1890) lists A. Henry collections in Hubei from Patung, Nanto, Hsingshan and Tunghu, all deposited at K without designating an holotype. Four collections mounted on two herbarium sheets of A. Henry are currently deposited at K: A. Henry 6356 from Nanto [K000858092] and A. Henry 6411A from Hsingshan [K000858093], both mounted on one sheet, and A. Henry 3951 from Nanto [K000858094] and A. Henry 7668 from Patung [K000858095], mounted on another. The specimens of A. Henry 6411A [K000858093] and A. Henry 6356 [K000858092] are annotated by Skog as syntypes of D. speciosa. A slightly smaller and atypical plant mounted on the second sheet was annotated “ Oreocharis ? sp. C. B. Clarke”. Another duplicate collection of A. Henry 6411A [E 00396435] deposited at E is also annotated by Skog as a syntype of D. speciosa. Overall, A. Henry 6411A represents the more complete and accurate collection of this species and is here designated as the lectotype. Conservation status. – Oreocharis speciosa has a wide distribution range across three provinces in South China. Only two populations have been observed by two of the authors (YMS, WHC), one situated in S Chongqing in the Jinfoshan Mountain and one in W Hubei in Enshi in the Suo Bu Ya Stone Forest park (Fig. 1 F-H). There are around hundred mature individuals and many immature plants in each known population, and the total number of individuals would be around 5000. The “Extent of Occurrence” (EOO) in Suo Bu Ya is around 100 m 2 and both locations receive some protection due to their occurrence in National Parks. We have not enough information for a definitive conservation assessment, but the species has been proposed by WEI & al. (2010) to be categorized as “Vulnerable” [VU A1c] following IUCN Red List Categories and Criteria (IUCN, 2012).Published as part of Chen, Wen-Hong, Shui, Yu-Min & Möller, Michael, 2014, Two new combinations in Oreocharis Benth. (Gesneriaceae) from China, pp. 179-182 in Candollea 69 (2) on pages 180-182, DOI: 10.15553/c2014v692a10, http://zenodo.org/record/571880
INNOVATIVE PILLAR[6]ARENE-BASED STATIONARY PHASES FOR HIGH-RESOLUTION GAS CHROMATOGRAPHIC ANALYSES
No full textIn this work, the synthesis, fabrication, and characterization of new stationary phases based on pillar[6]arene derivative modified by long alkyl chains (P6A-C10) for high-resolution gas chromatographic (GC) analyses are reported. Pillar[n]arenes are a new class of macrocyclic hosts that can accommodate specific guests due to their highly symmetrical and rigid pillar architectures with π-electron rich cavities. Quantum chemistry calculations have been performed, showing a difference in non-covalent interactions with the P6A-C10 pillar framework, which leads to specific selectivity for aromatic compounds. The GC columns prepared with these innovative stationary phases exhibited a medium polarity, and good reproducibility for run-to-run, day-to-day, and column-to-column analyses [1], demonstrating great potential as new stationary phases in separation science. Furthermore, peculiar advantages are achieved if compared with the commercial HP-5, HP-35, DB-17, and PEG-20M columns, showing unmatched resolving capabilities toward chloroaniline, bromoaniline, iodoaniline, toluidine, and xylene isomers [2].
References:
1. Sun, T., Chen, R., Huang, Q., Ba, M., Cai, Z., Hu, S., Liu, X., Nardiello, D., & Quinto, M., ACS Appl. Mater. Interfaces 14 (2022) 56132−56142.
2. Sun, T., Chen, R., Huang, Q., Ba, M., Cai, Z., Chen, H., Qi, Y., Chen, H., Liu, X., Nardiello, D., & Quinto, M., Anal. Chim. Acta 1251 (2023) 340979
A scalable top-down strategy toward practical metrics of Ni-Zn aqueous batteries with total energy densities of 165 W h kg -bar(1) and 506 W h L-bar(1)
No full textResearch interest in alkaline aqueous batteries has surged worldwide due to their merits of low cost and high safety. However, the development of practical high-energy Ni–Zn batteries has been beset by the bias between industrial application with gravimetrical energy limits and scientific research with volumetrical shortages. Herein, we propose a facile top-down strategy to prepare low-cost and ultra-dense Co-free microscale cathodes for Ni–Zn batteries. Based on the anion exchange and Kirkendall effect, this commercially viable technology is capable of permeating the matrix of microspheres with uniform and robust adherence of NiS nanodots and abundant mesopores. The enhanced proton-diffusion kinetics endows the Ni–Zn battery with impressive areal capacity (41.3 mA h cm−2) and a fast power response of 715 mW cm−2, together with 80 000 transient pulse cycles. A best practice for systematic measuring of aqueous batteries in a more practical metric is proposed. As a proof of concept, we demonstrate a commercial-grade 3.5 A h Ni–Zn pouch battery, which concomitantly presents record-high energy densities of 165 W h kg−1 gravimetrically and 506 W h L−1 volumetrically based on the whole battery. The cost is estimated conservatively at US $32.8 kW h−1 on a device scale. These results provide a new opportunity to advance high-energy Ni–Zn batteries and should be of immediate benefit toward low-cost, practical energy storage and grid-scale applications.Wanhai Zhou, Ding Zhu, Jian He, Jinchi Li, Hui Chen, Yungui Chen and Dongliang Cha
ISOMER SEPARATIONS BY INNOVATIVE GAS CHROMATOGRAPHY STATIONARY PHASES
No full textThe chromatographic separation of aromatic amines and xylenes isomers represents a big issue in chemical and petroleum industries, owing to their high similarity in terms of molecular sizes, polarity, and boiling points: as a result, commercial columns very often do not allow their complete peak separation. For this reason, several typologies of materials with different structures and properties have been developed and proposed as gas chromatography stationary phases in recent years. Macrocycles and ionic liquid-based chain-typed copolymers have emerged, due to their special chromatographic selectivity and separation mechanisms, resulting from their three-dimensional structures and outstanding thermal stability. Very recently, innovative stationary phases based on functionalized calixarene-polyethylene glycol (C4A-mPEG) [1], and amphiphilic triblock copolymer bonded with benzimidazolium ionic liquid (TCP-Bim) [2] were designed, characterized, and used for GC separations of aromatic isomers. The separation features of the C4A-mPEG stationary phase, resulting from multiple molecular recognition processes with analytes, including π-π, H-bonding, dipole-dipole, and van der Waals interactions, allowed to obtain high-resolution performances for a wide range of compounds and their isomers, especially benzaldehydes, phenols, and anilines. Moreover, compared with 4-tertbutyl calix[4]arene (C4A) and polyethylene glycol (PEG) stationary phases, a higher resolving capability was also observed for the separation of toluidine and xylidine isomers. The separation capabilities of the TCP-Bim columns are attributable to different analyte-stationary phase interaction mechanisms, arising from the particular TCP-Bim structure that combines ionic liquid and copolymer peculiarities, showing stronger retention towards aromatic compounds. The high-resolution capabilities of the TCP-Bim column were also tested with different aliphatic cis-/trans-isomers; the excellent separation performances for analytes with very similar properties demonstrated the good potential of these innovative materials as new classes of stationary phases for high-resolution GC separations.
References:
1. Chen, R., Cai, Z., Li, W., Huang, Q., Nardiello, D., Quinto, M., Liu, X., Hu, S., & Sun, T., Chem. Biodiversity 19 (2022) e202200829.
2. Huang, Q., Cai, Z., Chen, R., Zhang, W., Nardiello, D., Quinto, M., Liu, X., Hu, S., & Sun, T., Microchemical Journal 183 (2022) 108084
author = {M. Friendly}, title = {A Brief History of Data Visualization},
No full textyear = {2006}, publisher = {Springer-Verlag}, address = {Heidelberg}, booktitle = {Handbook of Computational Statistics: Data Visualization}, volume = {III}, editor = {C. Chen and W. H\"ardle and A Unwin}, pages = {???--???}, note = {(In press)}, © copyright by the author(s
Supplemental material for Combination immunosuppressant therapy and lupus nephritis outcome: a hospital-based studyY.M.C. and W.T.H. contributed equally to this work.
No full textSupplemental Material for Combination immunosuppressant therapy and lupus nephritis outcome: a hospital-based study Y.M.C. and W.T.H. contributed equally to this work. by Y M Chen, W T Hung, Y W Liao, C Y Hsu, T Y Hsieh, H H Chen, C W Hsieh, C T Lin, K L Lai, K T Tang, C W Tseng, W N Huang and Y H Chen in Lupus</p
Hetero-arm Star Polystyrene -block-Poly(4-vinylpyridine) (PS-b-P4VP) :Multiple Morphologies in Dilute Solutions
No full text
Orthogonal least squares methods and their application to non-linear system identification
No full textIdentification algorithms based on the well-known linear least squares methods ofgaussian elimination, Cholesky decomposition, classical Gram-Schmidt, modifiedGram-Schmidt, Householder transformation, Givens method, and singular valuedecomposition are reviewed. The classical Gram-Schmidt, modified Gram-Schmidt,and Householder transformation algorithms are then extended to combinestructure determination, or which terms to include in the model, and parameterestimation in a very simple and efficient manner for a class of multivariablediscrete-time non-linear stochastic systems which are linear in the parameters
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