cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Tunable internal quantum well alignment in rationally designed oligomer-based perovskite films deposited by resonant infrared matrix-assisted pulsed laser evaporation
Creators: name: Dirkes, D.
name: Vazquez-Mayagoitia, A.
name: Blum, V.
name: Liu, C.
name: Kanai, Y.
name: Mitzi, D.B.
name: Du, K.-Z.
name: You, W.
name: Huhn, W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: Hybrid perovskites incorporating conjugated organic cations enable unusual charge carrier interactions among organic and inorganic structural components, but are difficult to prepare as films due to disparate component chemical/physical characteristics (e.g., solubility, thermal stability). Here we demonstrate that resonant infrared matrix-assisted pulsed laser evaporation (RIR-MAPLE) mitigates these challenges, enabling facile deposition of lead-halide-based perovskite films incorporating variable-length oligothiophene cations. Density functional theory (DFT) predicts suitable organic and inorganic moieties that form quantum-well-like structures with targeted luminescence or exciton separation/quenching. RIR-MAPLE-deposited films enable confirmation of these predictions by optical measurements, which further display excited state behavior transcending traditional quantum-well models-i.e., with appropriate selection of specially synthesized organic/inorganic moieties, intercomponent carrier transfer efficiently converts excitons from singlet to triplet states in organics for which intersystem crossing cannot ordinarily compete with recombination. These observations demonstrate the uniquely versatile excited-state behavior in hybrid perovskite quantum wells, and the value of integrating DFT, organic synthesis, RIR-MAPLE and spectroscopy for screening/preparing rationally devised complex structures.
(101886) Jane Scholl
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
Teachers’ perception of online teaching and its effects on learning outcome during Covid-19: an India based mixed method study
Creators: name: Kaur, Jaswinder
name: Kumar, Pushpender
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: The purpose of this study was to explore the perceptions of teachers regarding online teaching whether they are comfortable and confident while delivering online content to students during this tough time of pandemic? Online teaching is not new in India, but many teachers are experiencing this first time due to emergency and sudden closure of institutions of higher education due to COVID 19. Teachers and students all are engaged in online teaching/learning and combat with several challenges i.e. lack of resources, expertise, anxiety, etc. This study is an attempt to determine the problems and issues pertained to teachers during online teaching. Efforts have been also made to find out teachers’ perceptions about students' learning outcomes. This study explored advantages/disadvantages as well as barriers of online instructions as perceived by teachers of various colleges affiliated to Guru Nanak Dev University (GNDU), Amritsar, Punjab, India. There is the significant importance of the type of online teaching experiences i.e. faculty members who were having positive online teaching experiences significantly differ from their colleagues who experienced the negative or no online teaching experiences. Results obtained from this study indicate those faculty members who were trained and having sufficient exposure towards the technology are more comfortable as well as successful while implementing online teaching, therefore, it is strongly recommended that sufficient training must be provided to the teaching fraternity. Our “New Education Policy 2020 also support this view and recognize the importance of online/blended/digital education.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 2 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 2/2022
title: Differential diagnosis of diseases with ocular muscles involvement.
Creators: name: Soares, Vinicius
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Neoplasia
subject: Lymphoma
subject: Abscess
subject: Contrast agent-intravenous
subject: Biopsy
subject: MR
subject: CT
subject: Neuroradiology brain
subject: Head and neck
subject: Eyes

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: This work aims to address the main differential diagnoses of diseases with involvement of the extrinsic ocular...
Self-directed learning and assessment in a crisis context: the COVID-19 pandemic as a case study
Creators: name: Tlili, Ahmed
name: Burgos, Daniel
name: Olivier, Jako
name: Huang, Ronghuai
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: The COVID-19 pandemic has forced schools to close and shift to remote education. However, this might create new challenges, as students might have poor self-directed learning skills to keep up with the learning process from home. Although many studies have focused on remote education during said pandemic, there is limited information on the strategies implemented to support and encourage self-directed learning and assessment. Therefore, in this study – focusing on a case in China – focus group interviews were conducted to collect data from different stakeholders on the implemented self-directed learning strategies during the COVID-19 pandemic. The results might help different education stakeholders in future to effectively maintain education in crises, leading to better learning outcomes.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 2 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 2/2022
Synthetic control over orientational degeneracy of spacer cations enhances solar cell efficiency in two-dimensional perovskites
Creators: name: Lin, Y.
name: Ade, H.
name: Nahid, M.M.
name: Moran, A.M.
name: Huang, J.
name: Stuard, S.J.
name: Yang, Z.
name: Chen, Z.
name: Zhou, N.
name: Xiao, X.
name: Hu, H.
name: Hu, J.
name: Yan, L.
name: You, W.
name: Guo, Z.
name: Oswald, I.W.H.
name: Neilson, J.R.
name: Williams, O.F.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: Two-dimensional perovskites have emerged as more intrinsically stable materials for solar cells. Chemical tuning of spacer organic cations has attracted great interest due to their additional functionalities. However, how the chemical nature of the organic cations affects the properties of two-dimensional perovskites and devices is rarely reported. Here we demonstrate that the selection of spacer cations (i.e., selective fluorination of phenethylammonium) affects the film properties of two-dimensional perovskites, leading to different device performance of two-dimensional perovskite solar cells (average n = 4). Structural analysis reveals that different packing arrangements and orientational disorder of the spacer cations result in orientational degeneracy and different formation energies, largely explaining the difference in film properties. This work provides key missing information on how spacer cations exert influence on desirable electronic properties and device performance of two-dimensional perovskites via the weak and cooperative interactions of these cations in the crystal lattice.
Annual Report Investigation Of In Situ Physical Properties Of Surface And Subsurface Site Materials By Engineering Geophysical Techniques Project Part 1
Creators: name: Watkins, J. S.
Publisher: name: U.S. Geological Survey
Year: 1966
Subjects: Planetary Science

description: This report includes the first substantive body of in situ density, bearing strength, shear strength, and moisture content data measured by Project personnel. Emphasis in this fiscal year's measurements was on low-density materials since available data suggest that the upper meter or so of the lunar surface consists of low-density material.
The project-based method to promote competence-based education. A case study in teaching computer science in Italian secondary school
Creators: name: Giaffredo, Silvio
name: Mich, Luisa
name: Ronchetti, Marco
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: Many researchers and institutions in the field of education are striving to align the different levels of the education system to the growing needs and requirements of society. A meaningful part of these attempts has been concentrated on a systematic introduction of the competence-based education approach. Some countries adopted it and reshaped the school systems accordingly. Introduced in Italian secondary schools in 2010 by the Ministry for Education, the competence-based approach has been only partially adopted in classes. Our research aims at investigating solutions to support its adoption for teachers in Italian secondary schools. As student projects are frequently proposed in computer science classes, the project-based learning method was identified as a potential solution and investigated in an empirical study including two parts: (a) An action research training course on project-based learning; (b) A collective case-study involving six student projects. The empirical study highlighted some critical issues to be dealt with to foster the adoption of the competence-based teaching approach. Results confirmed a weak commitment of teachers to the competence-based approach, but also that exploiting student projects towards the project-based learning method may encourage teachers to adopt a competence-based approach, provided the projects are carefully designed and subsequently managed. To this end the paper offers a schema to check if a project is compliant with the project-based learning approach and some guidelines to support teachers in their activity during the student projects.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022
Alcohol mediated degenerate chain transfer controlled cationic polymerisation of: Para -alkoxystyrene
Creators: name: Tanaka, J.
name: Hu, H.
name: You, W.
name: Prasher, A.
name: Nicewicz, D.A.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2019

description: In this report we demonstrate methanol as an effective degenerative chain transfer agent to control the cationic polymerisation (initiated by triflic acid) of electron rich p-alkoxy-styrenes, such as p-methoxystyrene (p-MOS). Kinetic analysis revealed that an induction period occurs initially during which free cationic polymerisation occurs at low monomer conversion before proceeding through the pseudo first order rate, analogous to the RAFT mechanism. Ethanol and isopropanol also demonstrated excellent control (> 1.30), however, with an apparent increase in experimental molecular weight. Furthermore, methanol controlled polymers were successfully chain extended upon sequential monomer addition, demonstrating the 'livingness' of the alcohol mediated cationic polymerisation.
Pristomyrmex fossulatus
Creators: name: Santschi, F.
Publisher: name: Zenodo
Year: 1923
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Pristomyrmex
Pristomyrmex fossulatus

description: 49. - Pristomyrmex fossulatus (For.) Sants. (1916).
= Xiphomyrmex fossulatus For. (1918).
J'avais deja signale cette mutation dans le Bull. Soc. Ent. France p. 51 (1916) mais cela avait echappe a Mr. Emery dans ses " Myrmicinae " du Genera Insectorum et dans Wheeler dans ses "Ants of Belgian Congo". Le genre Pristomyrmex n'etait pas encore connu en Afrique.
description: Published as part of Santschi, F., 1923, Descriptions de nouveaux formicides Ethiopiens et notes diverses. - I., pp. 259-295 in Revue de Zoologie Africaine 11 on page 286
Effect of Replacing Alkyl Side Chains with Triethylene Glycols on Photovoltaic Properties of Easily Accessible Fluorene-Based Non-Fullerene Molecular Acceptors: Improve or Deteriorate?
Creators: name: Wang, W.
name: Shi, Z.
name: Zhan, C.
name: Zhang, S.
name: Xiao, S.
name: Gao, J.
name: You, W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Hydrophilic oligo(ethylene glycol) (OEG) side chains are more flexible than alkyl chains and can facilitate the π-π stacking of conjugated polymer backbones, which has been proven to be a key structural feature leading to better device performance in polymer:fullerene blend polymer solar cells (PSCs). So far, little has been known about the influence of OEG side chains on the performance of non-fullerene acceptors in polymer:non-fullerene acceptor blends. Based on an easily accessible conjugated backbone of dicyanomethylene indanone-thiophene-fluorene-thiophene-dicyanometnylene indanone (DICTF), two non-fullerene molecular acceptors were synthesized with decyl (DICTF-C10) and triethylene glycol monoether (DICTF-TEG) side chains to blend with the polymer donor of PTB7-Th for PSCs. Replacing the decyl side chains with the TEGs on DICTF does improve the π-π stacking between the conjugated backbones as expected. For DICTF-TEG, nevertheless, forming the BHJ blend with the PTB7-Th donor leads to unfavorable film morphology structure of the active blend and deteriorated device performance with much lower PCE of 3.09% compared to the blend of PTB7-Th:DICTF-C10 with the maximum PCE of 6.93% at optimized conditions. It is found that charge generation, transport, and recombination within the PSC devices of the two acceptors were greatly impacted by introducing TEG side chains instead of alkyls into the conjugated backbone of DICTF. This comparative study on understanding the side chain effect on device performance allows the establishment of guidance on molecular engineering of non-fullerene molecular acceptors to obtain high performance PSCs.
Effective triage training for nurses: comparison of face to face, pamphlet, and multimedia training
Creators: name: Hosseini, Ali
name: Mojtahedzadeh, Rita
name: Aeen Mohammadi
name: Gharib, Mitra
name: Asadzandi, Shadi
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: Emergency Severity Index version4 is the standard triage method in Iran. Effectiveness of training by lecture or e-Learning was investigated. But its effect on nurse performance in triage unit was not studied. The aim of this research is to study the impact of triage training by lecture, multimedia, and pamphlet on triage nurse performance and comparison of them. 21 triage nurses from three general hospitals in Kermanshah in three groups of 5, 6, and 10 persons were included. In each hospital only one method of training was introduced. Pre training variances of percentages of performance accuracy in three groups were homogeneous and pre training triage accuracy was similar in these groups. Post training performance was statistically improved in lecture group and multimedia group but in pamphlet group this improvement was not seen. According to study results multimedia training can be suggested as a good substitute for traditional lectures to improve triage nurse performance. Multimedia training offers the learner freedom to study in their preferred time and place and is more compatible to nurse shift work.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022
Racial and Sex Inequities in the Use of and Outcomes After Left Ventricular Assist Device Implantation Among Medicare Beneficiaries
Creators: name: Cascino, Thomas M.
name: Somanchi, Sriram
name: Colvin, Monica
name: Chung, Grace S.
name: Brescia, Alexander A.
name: Pienta, Michael
name: Thompson, Michael P.
name: Stewart II, James W.
name: Sukul, Devraj
name: Watkins, Daphne C.
name: Pagani, Francis D.
Publisher: name: American Medical Association
Year: 2022
Subjects: subject: healthcare disparities
subject: Social Work
subject: FOS: Sociology
subject: Social Sciences

description: Background: Racial disparities in access to advanced therapies for heart failure (HF) patients are well documented, although the reasons remain uncertain. We sought to determine the association of race on utilization of ventricular assist device (VAD) and transplant among patients with access to care at VAD centers and if patient preferences impact the effect. Methods: We performed an observational cohort study of ambulatory chronic systolic HF patients with high-risk features and no contraindication to VAD enrolled at 21 VAD centers and followed for 2 years in the REVIVAL study (Registry Evaluation of Vital Information for VADs in Ambulatory Life). We used competing events cause-specific proportional hazard methodology with multiple imputation for missing data. The primary outcomes were (1) VAD/transplant and (2) death. The exposures of interest included race (Black or White), additional demographics, captured social determinants of health, clinician-assessed HF severity, patient-reported quality of life, preference for VAD, and desire for therapies. Results: The study included 377 participants, of whom 100 (26.5%) identified as Black. VAD or transplant was performed in 11 (11%) Black and 62 (22%) White participants, although death occurred in 18 (18%) Black and 36 (13%) White participants. Black race was associated with reduced utilization of VAD and transplant (adjusted hazard ratio, 0.45 [95% CI, 0.23–0.85]) without an increase in death. Preferences for VAD or life-sustaining therapies were similar by race and did not explain racial disparities. Conclusions: Among patients receiving care by advanced HF cardiologists at VAD centers, there is less utilization of VAD and transplant for Black patients even after adjusting for HF severity, quality of life, and social determinants of health, despite similar care preferences. This residual inequity may be a consequence of structural racism and discrimination or provider bias impacting decision-making.
title: Acute adverse reactions to contrast media in computed tomography and magnetic resonance imaging in 5-year-long observation
Creators: name: Szczurowska, Agata
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Drugs / Reactions
subject: Acute
subject: Safety
subject: Contrast agent-intravenous
subject: MR
subject: CT
subject: Contrast agents

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The learning objectives are to present acute adverse reactions (AARs) to contrast media (CM) based on iodine and gadolinium with emphasis on severity of the symptoms, affected population and seasonal variation of AARs to CM on the base of...
title: Acute aortic syndrome – posttherapy CT findings.
Creators: name: Salwa, Anna
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Acute
subject: Surgery
subject: Stents
subject: CT-Angiography
subject: CT
subject: Vascular

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The purpose of this study was to evaluate expected findings and complications after open thoracic aortic surgery on CT angiography. The aim of this study was to review the spectrum of CT findings after thoracic endovascular aortic repair...
Does teaching metacognitive skills through peer-conducted flipped classroom improve high school students’ self-regulation?
Creators: name: Mohammadi, Aeen
name: Mohammadi, Melika
name: Keshvari, Nazanin Zahra
name: Mojtahedzadeh, Rita
name: Asadzandi, Shadi
name: Rahimifar Tehrani, Bahareh
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: Obtaining metacognitive skills is crucial for enhancing self-regulation. So, this quasi-experimental study aimed to assess the effect of teaching metacognition through peer-conducted flipped classroom on high school students' self-regulation. 107 students filled out Self-Regulation Questionnaire as the pre-test. Both control and intervention groups received a package of four-session multimedia e-content about metacognition during four weeks. Each week, the students in the intervention group participated in a face-to-face session during which peers handled the instruction, while participants in the control group had teacher conducted sessions. Finally, the same questionnaire was answered as the post-test. The results showed a significant increase from pre to post-test scores in the intervention group, in contrast to the control one with no significant increase. Between groups comparison of post-test scores resulted in a significant higher score in the intervention group. So, the findings showed the positive effect of teaching metacognition through this method on students’ self-regulation.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022
The mechanisms of GLI-mediated repression and its establishment during embryonic development
Creators: name: Lex, Rachel Kristine
Publisher: name: The University of Texas at Austin
Year: 2022
Subjects: Hedgehog
GLI
Chromatin
Development
Transcriptional repression
Limb

description: The dynamic nature of embryonic development requires integration of multiple temporal, spatial, and quantitative signals to specify cells progressively into their ultimate fate. A crucial input is the transcriptional regulation that promotes cell specification and tissue patterning. The Hedgehog (HH) signaling pathway, which is essential for embryonic development, regulates target genes through GLI transcription factors. The HH pathway primarily serves to relieve transcription repression of GLI proteins to activate its target genes. Despite decades of research studying HH signaling and GLI proteins, the mechanisms by which GLI represses transcriptional activity remain incompletely understood. The goal of this research is to identify the mechanisms of GLI-mediated transcriptional repression and elucidate how GLI repression is established during embryonic development. In investigating how GLI proteins modulate chromatin at enhancers to repress HH target, I identify a subset of GLI enhancers that are activated in the developing limb only in the presence of HH signaling, through de-repression of a histone deacetylase (HDAC)-containing GLI repression complex (Lex et al., 2020). These HH-responsive GLI enhancers drive tissue-specific gene expression in response to HH signaling. After finding that HH signaling activates GLI enhancers through de-repression, I then determine if enhancers are able to be repressed by GLI prior to HH activation. I test the hypothesis that GLI repression would be established prior to HH signaling, to allow for coordinated, synchronized activation upon HH signal induction. Contrary to this model, I find that GLI repression is not established prior to HH signaling, as loss of GLI repressor is unable to activate enhancers or target genes prematurely. This model contradicts a longstanding model whereby GLI repression pre-patterns the anterior-posterior axis of the limb. Based on my findings, I propose an alternative model for limb polarity where pre-patterning begins in the lateral plate mesoderm with active GLI repression. Additionally, my research suggests that multiple HH-independent levels of regulation may be imposed in the early limb to prevent premature activation of HH target genes. Collectively, this research highlights the complexity of transcriptional regulation that drives development and prompts a reevaluation of a longstanding limb pre-patterning model.
Sensitivity of Molecular Packing and Photovoltaic Performance to Subtle Fluctuation of Steric Distortions within D-A Copolymer Backbones
Creators: name: You, W.
name: Liu, S.
name: Xiao, S.
name: Gao, J.
name: Wang, W.
name: Lu, X.
name: Zhan, C.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: How molecular conformation variation due to the existence of steric torsions within the conjugated backbones plays a role in molecular packing and resultant polymer solar cell (PSC) performance was investigated by synthesizing two isomeric alternating D-A copolymers. In these copolymers, poly{3′,4′-dihexyl-(2,2′:5′,2′′-terthiophene)-5,5′′-diyl-alt-[4′,7′-di-2-(4-(2′-ethylhexyl))thienyl-(5′,6′-difluorobenzo[c][1′,2′,5′]thiadiazole)]-5,5-diyl} (PTDTffBT(C6/EH)) and poly{3′,4′-di(2′-ethylhexyl)-(2,2′:5′,2′′-terthiophene)-5,5′′-diyl-alt-[4′,7′-di-2-(4-hexyl) thienyl-(5′,6′-difluorobenzo[c][1′,2′,5′]thiadiazole)]-5,5-diyl} (PTDTffBT(EH/C6)), which had comparable molecular weight, the linear hexyl and branched 2-ethylhexyl chains are interchanged between the donor and the acceptor units. Such molecular design could offer two isomeric donors with limited conformational steric distortions by positioning the given alkyl chains with fine steric disparity in the same conjugated backbone. The interchange of the side chains caused a fluctuation of ∼5° of the dihedral angles between the thiophenes within the donor units and between the ending thiophenes from the adjacent donor and acceptor units. The subtle transform on backbone steric distortions of the two copolymers leads to a negligible impact on electronic structures but a distinct one on molecular packing in film. The copolymers both embody polymorph molecular packing with preferential edge-on orientation in neat films. The (100) and (010) distance, corresponding to the lamellar stacking between the alkyl chains and the π-π stacking between the conjugated backbones, are both improved in the PTDTffBT(C6/EH) film with enhanced crystallinity than that in the PEDTffBT(EH/C6) film. Similar molecular packing feature remains for the BHJ blends of the two copolymers with the acceptor of PC71BM. Moreover, PTDTffBT(C6/EH) exhibits the apparant coexistence of face-on orientation with improved crystallinity. The PTDTffBT(C6/EH): PC71BM PSC devices offer a much improved maximum power conversion efficiency (PCE) of 8.24% over 6.13% of the PTDTffBT(EH/C6) device, mainly due to more efficient charge generation and balanced charge transport resulted from the optimized film microstructure. The investigation clearly shows the sensitivity of molecular packing and corresponding PSC device performance to subtle steric distortions within conjugated backbones.
AI-Driven Detection and Conservation of Rare Bird Species and Wildlife Using Computer Vision and Edge Computing
Creators: name: Cotton University
Publisher: name: Zenodo
Year: 2024

description:  

This research paper presents the development and implementation of an artificial intelligence (AI) system designed to detect and conserve rare bird species and wildlife. Leveraging computer vision and edge computing, the system captures real-time images of wildlife and integrates advanced algorithms to classify species and monitor their behaviors. Utilizing tools such as TensorFlow, OpenCV, and MediaPipe, the system aims to assist conservationists by providing timely and accurate data on endangered species. Edge computing is employed to ensure functionality in remote and resource-constrained environments, enhancing accessibility and effectiveness in wildlife monitoring. The primary objective is to develop an AI-based system that detects rare bird species and wildlife in real time using computer vision techniques. Secondary objectives include enabling behavior analysis and environmental context awareness, automating data collection for researchers and conservationists, and implementing edge computing for deployment in remote areas. This project aims to revolutionize wildlife monitoring by making it more accessible and efficient. By capturing and analyzing data in real time, the system can significantly enhance conservation efforts, offering precise information to aid in the protection of endangered species. It will also foster community engagement and awareness in wildlife conservation efforts.
End-cap Group Engineering of a Small Molecule Non-Fullerene Acceptor: The Influence of Benzothiophene Dioxide
Creators: name: Cao, H.
name: Pang, C.
name: Rech, J.
name: Bauer, N.
name: Rupar, P.A.
name: You, W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: In this study, a sulfonyl-containing end-capping moiety, benzothiophene dioxide, was selected to prepare the nonfullerene acceptor ITBC. ITBC has an acceptor-donor-acceptor (A-D-A) structure, with indacenodithieno[3,2-b]thiophene (IDTT) as the electron-rich core moiety. The strong electron-withdrawing sulfonyl acceptor units leads to extended UV-vis absorption into the near-IR region and relatively low frontier molecular orbital energy levels (LUMO/HOMO: -4.13 eV/-5.61 eV) with a narrow bandgap of 1.48 eV. These values compare favorably to the well-studied small molecule acceptor 2-(3-oxo-2,3-dihydroinden-1-ylidene)malononitrile end-capped indacenodithieno[3,2-b]thiophene (ITIC). A power conversion efficiency of 4.17% was achieved by fabricating organic solar cells with the fluorinated conjugated polymer FTAZ as the donor and ITBC as the acceptor. These results indicate that benzothiophene dioxide is a novel electron-withdrawing end-capping unit for ITBC, and can be used as an electron acceptor for organic solar cells.
General Post-annealing Method Enables High-Efficiency Two-Dimensional Perovskite Solar Cells
Creators: name: Guo, Z.
name: Hu, J.
name: Moran, A.M.
name: Toney, M.F.
name: Chen, H.
name: You, W.
name: Yan, L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Two-dimensional (2D) perovskites, with a formula of (RNH3)2MAn-1PbnI3n+1, have shown impressive photovoltaic device efficiency with improved stability. The operating mechanism of such photovoltaic devices is under debate and the scope of incorporated organic cations (RNH3 +) is limited. We report a general post-annealing method to incorporate a variety of organic cations into 2D perovskites, which demonstrate significant device efficiencies (7-12%). A detailed investigation of the archetypical (C4H9NH3)2MA3Pb4I13 (n = 4) reveals that such perovskites thin films contain multiple 2D phases (i.e., 2D quantum wells, n = 2, 3, 4,...). These phases appear to be distributed with decreasing n values from the top to the bottom of the 2D perovskites thin film, enabling efficient energy transfer in the first 500 ps and possible charge transfer at longer time scale, thereby accounting for high device efficiencies. Our post-annealing method is compatible with ambient condition and only requires relatively low annealing temperature for a very short period of time, offering significant prospects for scalable manufacturing of 2D perovskites solar cells.
title: Left- versus right-arm injection of contrast material: it effects on image quality of 70-kVp computed tomography angiography of head and neck using the third generation dual source CT
Creators: name: Chen, Yu
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Cardiovascular system
subject: CT-Angiography
subject: Contrast agent-intravenous
subject: Audit and standards
subject: Computer Applications-3D
subject: Arteriosclerosis
subject: Aneurysms
subject: Connective tissue disorders

description: Aims and objectives Methods and materials Results Conclusion Personal information References
description: Aims and objectives: To investigate the effects of the right- and left-arm injections of contrast material on image quality in computed tomography angiography (CTA) of the head and neck, using the third generation dual source CT combined with the 70kVp and advanced...
Dramatic Improvement of the Mechanical Strength of Silane-Modified Hydroxyapatite-Gelatin Composites via Processing with Cosolvent
Creators: name: Lee, Y.-T.
name: Ko, C.-C.
name: Hu, H.
name: Hu, J.
name: You, W.
name: Wong, S.-W.
name: Huang, B.-W.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Bone tissue engineering (BTE) requires a sturdy biomaterial for scaffolds for restoration of large bone defects. Ideally, the scaffold should have a mechanical strength comparable to the natural bone in the implanted site. We show that adding cosolvent during the processing of our previously developed composite of hydroxyapatite-gelatin with a silane cross-linker can significantly affect its mechanical strength. When processed with tetrahydrofuran (THF) as the cosolvent, the new hydroxyapatite-gelatin composite can demonstrate almost twice the compressive strength (97 vs 195 MPa) and biaxial flexural strength (222 vs 431 MPa) of the previously developed hydroxyapatite-gelatin composite (i.e., processed without THF), respectively. We further confirm that this mechanical strength improvement is due to the improved morphology of both the enTMOS network and the composite. Furthermore, the addition of cosolvents does not appear to negatively impact the cell viability. Finally, the porous scaffold can be easily fabricated, and its compressive strength is around 11 MPa under dry conditions. All these results indicate that this new hydroxyapatite-gelatin composite is a promising material for BTE application.
University climate in distance education contexts: developing an assessment instrument
Creators: name: Damiano, Felini
name: Zobbi, Elisa
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: The article presents the validation of an instrument for the assessment of students’ perception of the university climate in distance education settings. Also in such contexts, students establish relationships with classmates and teachers, and feel the atmosphere, the sense of belonging to an institution and to a community of learners. For teachers, however, it is difficult to understand how students perceive these dynamics. Therefore, the University Climate Questionnaire for Distance Education Contexts (UCliQ-DE), composed of 22 items, has been developed and validated through factorial analysis and reliability studies among a population of freshmen in an Italian BA program in Educational Sciences. It was concluded that the UCliQ-DE is a valid and reliable assessment tool, and that it yields five interpretable factors: the perception of the relationships among students, the sense of belonging to the academic community, the previous expectations about the online university climate, the perception of the relationships between students and teachers, and the awareness of the potential limits of online interactions.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022
(101888) George Lewis
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
title: Congenital malformations of the central nervous system, a supratentorial quiz. Let's see what do you know?
Creators: name: Camarco, Mariana
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Genetic defects
subject: Foetus
subject: Congenital
subject: Diagnostic procedure
subject: eLearning
subject: Education
subject: Ultrasound
subject: MR
subject: CT
subject: Paediatric
subject: Neuroradiology brain
subject: CNS

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: Brain is one of the most complex organ in human body with many structures developing at the same time in intra-uterus life. When facing a congenital malformation it's highly important to differentiate the embryonic moment of the insults/fault to try...
(101884) Hannah Spraggs
Creators: name: Professions, Victorian
Publisher: name: University of Oxford
Year: 2022
Subjects: subject: 220201 Business and Labour History
subject: FOS: Philosophy, ethics and religion
subject: History
subject: 140203 Economic History
subject: FOS: Economics and business

description: This three-year research project began in January 2014 and investigated whether, during the Victorian period, the professions formed a distinct self-sustaining social group with its own mores and values. The project looked at 16,000 individuals drawn from census data for Alnwick, Brighton, Bristol, Dundee, Greenock, Leeds, Merthyr Tydfil, Morpeth, and Winchester. The research project was funded by the UK Economic & Social Research Council and was based at the Universities of Oxford and Northumbria.
The impact of Facebook usage in education on students’ academic performance at the University of Jordan
Creators: name: Yousef, Suzan
name: Yousef, Khalil
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: Facebook, as a social networking site, is one of the most important means of communication technologies that have been widely adopted by college students and their professors worldwide. The purpose of this study is to shed light on the impact of Facebook on higher education generally and specifically on the academic performance of the students of the University of Jordan. For the completion of this study, the researchers selected a random sample of students from the University of Jordan and gave them a questionnaire on how Facebook affected their academic performance. The collected data was analyzed and tested by using correlation tests through SPSS, a data analysis program. The independent variable measured: 1- communication among students and communication between them and the faculty members; 2- sharing of resources and materials; 3- and collaboration among students. The academic achievement of students was measured by examinations and/or by continuous assessment such as (their GPAs, overuse or multitasking, and the time they spend on studying). Three pre-determined hypotheses tested are: (H1) Communication through Facebook has no significant impact on students’ academic performance. (H2) The sharing of educational resources and materials through Facebook does not significantly influence students’ academic performance. (H3) Collaboration among students through Facebook has no significant influence on their academic performance.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022
A Fused Ring Electron Acceptor with Decacyclic Core Enables over 13.5% Efficiency for Organic Solar Cells
Creators: name: Li, Y.
name: Rech, J.J.
name: Zhao, F.
name: He, D.
name: Ma, W.
name: Xin, J.
name: Wei, Z.
name: Wang, C.
name: You, W.
name: Li, B.
name: Jiang, L.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Extending π-conjugation of donor units in fused ring electron acceptors (FREAs) promises to reinforce intramolecular charge transfer for smaller bandgaps, and enhances intermolecular interactions for higher charge mobility. Despite these advantages, power conversion efficiencies (PCEs) of FREAs with a large planar donor core are still below 12%. Herein, a fused decacyclic donor unit, IDC, is developed, and the FREA, IDCIC, whose optical bandgap is 1.45 eV, is synthesized. The FTAZ:IDCIC-based organic solar cell (OSC) with a binary additive, chloronaphthalene and 1,8-diiodooctane (CN&DIO), affords a remarkable PCE of 13.58%, which is among the highest efficiencies of OSCs. The binary additive plays a crucial role in the morphology of FTAZ:IDCIC-based OSCs. The addition of DIO promotes IDCIC to aggregate and enhances domain size and domain purity in FTAZ:IDCIC blend film for its poor solubility in DIO, while the addition of chloronaphthalene (CN) inhibits the aggregation, facilitates IDCIC to diffuse into the donor, and reduces domain size and domain purity for its excellent solubility in CN. The binary additive, CN&DIO, compromises the effect of the two; thus FTAZ:IDCIC-based OSCs with 0.25% CN&DIO obtain moderate domain size and high domain purity simultaneously, achieving the least charge recombination for the highest JSC (21.98 mA cm−2) and fill factor (FF) (71.03%).
title: Follow-up neuroimaging algorithm for the assessment of high-grade gliomas treatment.
Creators: name: Villota Delgado, Vania
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Neuroradiology brain
subject: CNS
subject: MR-Diffusion/Perfusion
subject: MR-Spectroscopy
subject: MR
subject: Decision analysis
subject: Education
subject: Neoplasia
subject: Education and training

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: To review the current follow-up criteria and the conventional imaging findings related to high-grade gliomas treatment. To propose a follow-up algorithm that integrates conventional and advanced neuroimaging which may help the radiologist make a...
Polymer Solar Cells with 90% External Quantum Efficiency Featuring an Ideal Light- and Charge-Manipulation Layer
Creators: name: Chen, J.-D.
name: Zhu, J.
name: Xu, R.-P.
name: Zhan, X.
name: You, W.
name: Tang, J.-X.
name: Li, C.
name: Li, Y.-Q.
name: Huang, J.-S.
name: Zhang, Q.
name: Zhang, Y.-X.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Rapid progress in the power conversion efficiency (PCE) of polymer solar cells (PSEs) is beneficial from the factors that match the irradiated solar spectrum, maximize incident light absorption, and reduce photogenerated charge recombination. To optimize the device efficiency, a nanopatterned ZnO:Al2O3 composite film is presented as an efficient light- and charge-manipulation layer (LCML). The Al2O3 shells on the ZnO nanoparticles offer the passivation effect that allows optimal electron collection by suppressing charge-recombination loss. Both the increased refractive index and the patterned deterministic aperiodic nanostructure in the ZnO:Al2O3 LCML cause broadband light harvesting. Highly efficient single-junction PSCs for different binary blends are obtained with a peak external quantum efficiency of up to 90%, showing certified PCEs of 9.69% and 13.03% for a fullerene blend of PTB7:PC71BM and a nonfullerene blend, FTAZ:IDIC, respectively. Because of the substantial increase in efficiency, this method unlocks the full potential of the ZnO:Al2O3 LCML toward future photovoltaic applications.
Unique Energy Alignments of a Ternary Material System toward High-Performance Organic Photovoltaics
Creators: name: Cheng, P.
name: Chang, S.-Y.
name: Zhu, J.
name: You, W.
name: Huang, W.
name: Wang, R.
name: Zhang, Q.
name: Zhao, H.
name: Zhan, X.
name: Liu, Y.
name: Wang, C.
name: Zhu, C.
name: Meng, L.
name: Sun, P.
name: Cheng, H.-W.
name: Wang, J.
name: Huang, T.
name: Yang, Y.
Publisher: name: The University of North Carolina at Chapel Hill University Libraries
Year: 2018

description: Incorporating narrow-bandgap near-infrared absorbers as the third component in a donor/acceptor binary blend is a new strategy to improve the power conversion efficiency (PCE) of organic photovoltaics (OPV). However, there are two main restrictions: potential charge recombination in the narrow-gap material and miscompatibility between each component. The optimized design is to employ a third component (structurally similar to the donor or acceptor) with a lowest unoccupied molecular orbital (LUMO) energy level similar to the acceptor and a highest occupied molecular orbital (HOMO) energy level similar to the donor. In this design, enhanced absorption of the active layer and enhanced charge transfer can be realized without breaking the optimized morphology of the active layer. Herein, in order to realize this design, two new narrow-bandgap nonfullerene acceptors with suitable energy levels and chemical structures are designed, synthesized, and employed as the third component in the donor/acceptor binary blend, which boosts the PCE of OPV to 11.6%.
Pristomyrmex orbiceps Sants
Creators: name: Santschi, F.
Publisher: name: Zenodo
Year: 1923
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Formicidae
Pristomyrmex
Pristomyrmex orbiceps

description: 48. - Pristomyrmex orbiceps Sants, (1916).
= Xiphomyrmex orbiceps Sants. (1914).
description: Published as part of Santschi, F., 1923, Descriptions de nouveaux formicides Ethiopiens et notes diverses. - I., pp. 259-295 in Revue de Zoologie Africaine 11 on page 286
title: How to ultrasound a transplanted kidney?
Creators: name: Szczurowska, Agata
Publisher: name: European Congress of Radiology
Year: 2017
Subjects: subject: Kidney
subject: Ultrasound
subject: Complications
subject: Screening
subject: Grafts
subject: Transplantation

description: Learning objectives Background Findings and procedure details Conclusion Personal information References
description: Learning objectives: The aim of the exhibit is to present a method of thorough kidney transplant ultrasound examination with presentation of ultrasound images of normal and pathological features of renal...
Technological Pedagogical Content Design (TPCD) for a User-centered website: a case study in Finland
Creators: name: Hosseini, Zahra
name: Hytönen, Kimmo
name: Kinnunen, Jani
Publisher: name: Journal of e-Learning and Knowledge Society
Year: 2022

description: Research on behavioral factors influencing website quality has resulted in user-centered website design methods. User Experience (UX) research and design are promising in identifying users’ needs, requirements, expectations, and desires to enhance their satisfaction with digital products and services. This study employs User Experience Honeycomb to understand the user aspects and utilizes Technological Pedagogical Content (TPC) for a systematic redesign of the content of a user-centered website. The website of Suomen Yrittäjät, the umbrella association of Finnish SME entrepreneurs, is the context of the case study in Finland and the data is collected from immigrant entrepreneurs with the user-experience method. The data is analyzed based on TPC components. The content of website is redesigned based on TPCD assuming immigrants as adult self-learners who learn knowledge and attitudes about entrepreneurship in Finland through the Suomen Yrittäjät website. This learning and knowledge-transfer process are argued to increase their cultural adaptation into the Finnish society. The novelty of TPCD is a pedagogical view on users to learn information, values, and skills through web pages. TPCD is a practical model offering systematic instructions to utilize user-experience methods for designing user-centered websites and other digital services.
description: Journal of e-Learning and Knowledge Society, Vol 18 No 1 (2022): Journal of e-Learning and Knowledge Society - Regular Issue N. 1/2022