4,407 research outputs found
Complete structural characterization of single carbon nanotubes by Rayleigh scattering circular dichroism
No full textFunding Information: This work was supported by the National Natural Science Foundation of China under grant numbers 52021006 (J. Zhang), 52025023 (K.L.) and 51991342 (K.L.); the Key R&D Programme of Guangdong Province with grant numbers 2020B010189001 (K.L.), 2019B010931001 (K.L.) and 2018B030327001 (K.L.); the National Key R&D Programme of China under grant numbers 2016YFA0300903 (K.L.), 2017YFA0303800 (K.L.) and 2016YFA0300804 (P.G.); the Strategic Priority Research Programme of Chinese Academy of Sciences with grant number XDB33000000 (K.L.); Beijing Natural Science Foundation under grant number JQ19004 (K.L.); Beijing Graphene Innovation Programme under grant number Z181100004818003 (K.L.); the Pearl River Talent Recruitment Programme of Guangdong Province with grant number 2019ZT08C321 (K.L.); National Equipment Programme of China under grant number ZDYZ2015-1 (X.B.); National Postdoctoral Programme for Innovative Talents under award number BX20190016 (C.L.) and China Postdoctoral Science Foundation under award numbers 2019M660280 (C.L.) and 2019M660281 (R.Q.). Publisher Copyright: © 2021, The Author(s), under exclusive licence to Springer Nature Limited.Non-invasive, high-throughput spectroscopic techniques can identify chiral indices (n,m) of carbon nanotubes down to the single-tube level1–6. Yet, for complete characterization and to unlock full functionality, the handedness, the structural property associated with mirror symmetry breaking, also needs to be identified accurately and efficiently7–14. So far, optical methods fail in the handedness characterization of single nanotubes because of the extremely weak chiroptical signals (roughly 10−7) compared with the excitation light15,16. Here we demonstrate the complete structure identification of single nanotubes in terms of both chiral indices and handedness by Rayleigh scattering circular dichroism. Our method is based on the background-free feature of Rayleigh scattering collected at an oblique angle, which enhances the nanotube’s chiroptical signal by three to four orders of magnitude compared with conventional absorption circular dichroism. We measured a total of 30 single-walled carbon nanotubes including both semiconducting and metallic nanotubes and found that their absolute chiroptical signals show a distinct structure dependence, which can be qualitatively understood through tight-binding calculations. Our strategy enables the exploration of handedness-related functionality of single nanotubes and provides a facile platform for chiral discrimination and chiral device exploration at the level of individual nanomaterials.Peer reviewe
Development of polyion-complex hydrogels as an alternative approach for the production of bio-based polymers for food packaging applications : a review
Full text linkDevelopment of packaging materials from renewable resources has for a long time been desirable for sustainability reasons, but with recent explosion in prices of petroleum products, this now becomes also more economically viable. This paper shows how fundamental chemistry underlying three forms of hydrogels—physical hydrogels, chemical hydrogels, and interpenetrating polymer networks (IPN)—can be integrated to produce a new family of food packaging materials from biopolymers, illustrated here using gelatin and low-methoxyl pectin as examples. Application of this technique to create hydrogels from bio-based materials offers the potential for developing novel, biodegradable packaging applications, particularly for foods, that meet the ever-increasing demands for natural and environmentally compatible material
Author Correction: Long-range chiral exchange interaction in synthetic antiferromagnets
Full text linkIn the version of this Article originally published, the sentence ‘D.-S.H. wrote the paper with K.L., J.H. and M.K.’ in the author contributions was incorrect; it should have read ‘D.-S.H. wrote the paper with K.L., J.H., M.-H.J. and M.K.’ This has been corrected in the online versions of the Article
Cyclical Rs-A-Rsh I-V Curve Fitting MATLAB program with I-V curve experimental measurements
No full textMeasurement datasets are attached in Microsoft workbook format, entitled as:
1)Mono70W 999 Irradiance
2)Poly70W 1000 Irradiance
which are the experimentally measured I-V curves for both mono- and poly- crystalline silicon PV modules. The datasets are obtained by connecting the PV Analyzer towards the targetted PV module, placing the PV module directly under the sun, in which such experiment is conducted in the afternoon. The generated reports from the PV Analyzer's software are filtered, and two of the datasets are selected to present in this paper.
Other than the measured specification of the PV module, the datasets also consist three columns of data, which are the voltage, current and power. By plotting these data points accordingly towards x- and y- axis, the experimentally measured I-V and/or P-V curve is obtained.
Total of 2 main programs developed through MATLAB platform are attached, entitled as:
1)IV_Curve_Characterization_Proposed_Model
2)IV_Curve_Characterization_Traditional_Model
which are the I-V curve fitting parameterization algorithm respectively for proposed and traditional mathematical model. The rest of the .m files are coded to complement the features provided in the main programs.
The program entitled "WinOnTop" is obtained from https://www.mathworks.com/matlabcentral/fileexchange/42252-winontop, thus cited as:
Igor (2020). WinOnTop (https://www.github.com/i3v/WinOnTop), GitHub. Retrieved June 6, 2020.
By executing the programs in MATLAB, press the "Load File" button to select the I-V curve dataset. The user can adjust the Rs, A, and Rsh parameters by pressing the interface button, or pressing the "Auto" button to execute the Cyclical Rs-A-Rsh parameterization algorithm that programmed by the author targeting the objective of minimizing the MAEP error between measured and modeled I-V curve. While the three parameters are adjusting, the information will be updated accordingly. When the "Auto" curve-fitting is completed, a report can be generated showing the successive MAEP iteration throughout the curve fitting if the user presses the "OK" button on the generated window.
A folder entitled "Result" is attached, including four .m files and eight .fig files, which all of these are presented in the result section of the paper.
Two main programs entitled:
1)MAEP_Plotter_Mono
2)MAEP_Plotter_Poly
are attached to compare the obtained results. Comparisons are made between the traditional and proposed mathematical models
Agent Angus by K.L. Denman
No full textDenman, K.L. Agent Angus. Victoria: Orca Book Publishers, 2012. Print. An Orca Currents book for reluctant middle school readers, the story follows Angus and his best friend Shahid on their mission to solve a mysterious theft. Canadian author K.L. Denman writes in her usual first-person narrative style with characteristic elements of mystery, science and romance. The story takes place at a school where a stink bomb incident has led to all the students gathering on the front lawn. Right from the book’s introduction (“I’m not a lucky guy. Today luck has chosen to place me next to the one and only Ella Eckles”), readers are taken inside Angus’ head and will be rooting for him along the way. When his crush’s cherished sketchbook goes missing, Angus poses as a mentalist who can solve the crime by reading people. He ‘proves’ his abilities to Ella by pointing out the shifty stink bomb perpetrator right before he is nabbed by the principal. Humorous elements run throughout such as when the boys consider various spy devices (Gordon the ‘too obvious’ robot, a rocket pack launched from a plane, pricey video cameras hidden in smiley face buttons or baseball hats which are not allowed in school, and affordable but oversized rear view sunglasses). Suspense builds as the various suspects are considered. Is the thief their fellow classmate, their art teacher or someone they least suspected? And what could their motive be? This quick read full of spying and intrigue will have readers flipping pages to solve the mystery of the sketchbook and find out if Angus will finally confront the truth. The fluid writing style with varying sentence lengths adds to the drama and pace of the story. This light-hearted story makes a great choice for reluctant readers but lacks deep meaning. It may not appeal to readers who are looking to be challenged. Those looking for a light, easy read will find it enjoyable.Recommended: 3 out of 4 stars Reviewer: Lori Williams Lori Williams has been teaching at Forest Grove School in British Columbia for the past 6 years and feels lucky to be part of a wonderful team of colleagues and students. This year she is teaching grade 5 at Forest Grove and is also a graduate student in the University of Alberta’s Teacher-Librarianship by Distance Learning program
DATS reduces LPS-induced iNOS expression, NO production, oxidative stress and NF-κB activation in RAW 264.7 macrophages
No full textMosses new to Hong Kong (1)
No full textTen moss species - Garkea flexuosa (Griffith) Marg. & Nork., Campylopus laxitextus Lac., Fissidens dubius P. Beauv., Fissidens ceylonensis Dozy & Molk, Fissidens maceratus Mitt., Philonotis thwaitesii Mitt., Isopterygium minutirameum (C. Muell.)Jaeg., Homalia trichomanoides (Hedw.) B.S.G., Pogonatum neesii (C. Muell.) Dozyand Polytrichum formosum Hedw. are reported new to Hong Kong. Among them, five are new to Guangdong Province of China
sj-docx-1-jdr-10.1177_00220345221123256 – Supplemental material for TRAF3IP2–IL-17 Axis Strengthens the Gingival Defense against Pathogens
No full textSupplemental material, sj-docx-1-jdr-10.1177_00220345221123256 for TRAF3IP2–IL-17 Axis Strengthens the Gingival Defense against Pathogens by J. Zhang, L. Sun, M.H.H. Withanage, S.M. Ganesan, M.A. Williamson, J.T. Marchesan, Y. Jiao, F.R. Teles, N. Yu, Y. Liu, D. Wu, K.L. Moss, A.K. Mangalam, E. Zeng, Y.L. Lei and S. Zhang in Journal of Dental Research</p
Letter from J.P. Bradley to Mr. [William] S. Martin The Dominguez Estate Company, June 28, 1940
No full textRegarding attached payment by Mr. K.L. Schaap settling his account
K.L. 3-8-55
Full text linkA description of the different studies within the Perceptual Form of the City, a research project investigating the individual’s perception of the urban landscape
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