446 research outputs found
Supplemental Material, sj-pdf-1-her-10.1177_19375867231192087 - Biophilic Design and Its Effectiveness in Creating Emotional Well-Being, Green Satisfaction, and Workplace Attachment Among Healthcare Professionals: The Hospice Context
No full textSupplemental Material, sj-pdf-1-her-10.1177_19375867231192087 for Biophilic Design and Its Effectiveness in Creating Emotional Well-Being, Green Satisfaction, and Workplace Attachment Among Healthcare Professionals: The Hospice Context by Elena-Nicoleta Untaru, Heesup Han, Andreea David and Xiaoting Chi in HERD: Health Environments Research & Design Journal</p
In-situ TEM study of carbon nanomaterials and thermoelectric nanomaterials
No full textThesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 2011.This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.Cataloged from PDF version of thesis.Includes bibliographical references (p. 103-112).Graphene nanoribbons (GNRs) are quasi one dimensional structures which have unique transport properties, and have a potential to open a bandgap at small ribbon widths. They have been extensively studied in recent years due to their high potential for future electronic and spintronic device applications. The edge structures - including the edge roughness and chirality - dramatically affect the transport, electronic, and magnetic properties of GNRs, and are of the critical importance. We have developed an efficient way of modifying the edges structures, to produce atomically smooth zigzag and armchair edges by using insitu TEM with a controlled bias. This work provides us with many opportunities for both fundamental studies and for future applications. I also report the use of either furnace heating or Joule heating to pacify the exposed graphene edges by loop formation in the graphitic nanoribbons. The edge energy minimization process involves the formation of loops between adjacent graphene layers. An estimation of the temperature during in-situ Joule heating is also reported based on the melting and evaporation of Pt nanoparticles. In this thesis work, I have also investigated the morphological and electronic properties of GNRs grown by chemical vapor deposition. Our results suggest that the GNRs have a surprisingly high crystallinity and a clean surface. Both folded and open edges are observed in GNRs. Atomic resolution scanning tunneling microscopy (STM) images were obtained on the folded layer and the bottom layer of the GNR, which enables clear identification of the chirality for both layers. We have also studied the electronic properties of the GNRs using low temperature scanning tunneling spectroscopy (STS). Our findings suggest that edges states exist at GNR edges which are dependent on the chiral angles of the GNRs.by Xiaoting Jia.Ph.D
Jeholornis prima Zhou 2002
No full textEMENDED DIAGNOSIS OF <i>J.</i> <i>PRIMA</i> <p> Based on the morphological study of this specimen, we provide the following revised diagnosis for <i>J. prima</i>. A large stem bird with the following combination of features: premaxilla edentulous with short maxillary process; two teeth with blunt crowns in maxilla and three relatively smaller teeth in dentary (new); paired, sheet-like preorbital ossifications present near the nasals (new, autapomorphy); C-shaped lacrimal with short rostrodorsal ramus and lacrimal foramen (new); unreduced postorbital forming a complete postorbital bar with jugal (new); pterygoid rami of vomer much longer than the fused rostral portion, expanded in the middle and lacking the caudodorsal process (new); palatine with broad pterygoid wing and jugal process (new); narrow and restricted mandibular fenestra between prearticular and surangular (new); 27 caudal vertebrae in total, with the transition point occurring after the fifth vertebra; lateral trabecula of sternum absent; caudalmost pair of sternal ribs expanded; first phalanx of the third manual digit twice as long as the second phalanx; ratio of forelimb (humerus plus ulna plus carpometacarpus) to hindlimb (femur plus tibiotarsus plus tarsometatarsus) of ~1.2:1; dorsal margin of the ilium nearly straight and craniodorsal–caudoventrally oriented (modified from Zhou & Zhang, 2002; O’Connor <i>et al.</i>, 2012; Zheng <i>et al.</i>, 2020).</p>Published as part of <i>Hu, Han, Wang, Yan, Fabbri, Matteo, O, Jingmai K., Connor, Mcdonald, Paul G., Wroe, Stephen, Yin, Xuwei, Zheng, Xiaoting, Zhou, Zhonghe & Benson, Roger B. J., 2023, Cranial osteology and palaeobiology of the Early Cretaceous bird Jeholornis prima (Aves: Jeholornithiformes), pp. 93-112 in Zoological Journal of the Linnean Society 198 (1)</i> on page 107, DOI: 10.1093/zoolinnean/zlac089, <a href="http://zenodo.org/record/7926859">http://zenodo.org/record/7926859</a>
Emerging rural tourism in China’s current tourism industry and tourist behaviors: the case of Anji County
No full text
Constructing Multidimensional and Integrated Experimental Teaching System of Economics and Management
No full textWord of Mouth Propagation in Online Social Networks
No full textAbstract—Online social networks (OSNs) are becoming an important propagation platform for Word of mouth (WOM). Therefore, it is of great significance to study the propagation of WOM in OSNs. A WOM propagation model named N-P-N is proposed in this paper, and some simulation experiments are carried out to investigate the mechanism of WOM propagation. From the sensitivity analysis of degree of initial information source node, it can be seen that the degree of initial information source node determines the scope and speed of the propagation of WOM in OSNs in some extent. Then the sensitivity analysis of number of initial information source nodes shows that the initial source nodes are crucial for controlling the propagation of negative information in OSNs. Moreover, from the user behavior respect, it is found that different user behavior in OSNs causes different propagation results, the more users who are willing to diffuse WOM, the more scope WOM can propagate and the faster the information diffuses. Findings in this paper are helpful for enterprises to form an effective WOM. Index Terms—word of mouth, online social networks, information propagation/diffusion I
Effect of bias voltage on the erosion performance of TiAlSiN coatings on TC6 substrate by high power impulse magnetron sputtering
No full textTiAlSiN coatings were deposited on TC6 substrates by high power impulse magnetron sputtering at various bias voltages for the improvement of titanium alloy anti-sand erosion performance. The effect of bias voltage on the composition, microstructure and mechanical properties were investigated by X-ray photoelectron spectroscopy, X-ray diffractometer, transmission electron microscopy, scanning electron microscopy, Rockwell-C indentation, scratch testing and nano nanoindentation. The erosion performance was evaluated at the impingent angles of 30 degrees and 90 degrees respectively in a sand blasting tester. With the application and increase in bias voltage, the discharge current increases from -87 A to -210 A. The coatings exhibit face center cubic structure, mainly composed of the (Ti,Al)N nanocrystallites and Si3N4 matrix. The preferred orientation shifts from (200) to (220) in the range of 0--150 V, but goes back to (200) at -200 V. The surface nodular defects and deposition rate are gradually reduced, yet the sectional structure becomes much denser. The residual stress is compressive and continually grows, whereas the adhesion strength, hardness (H), Young's modulus (E) and H/E ratio gradually increase before decreasing, arriving at maximum values of -68 N, -37.53 GPa, -339.9 GPa and 0.11 respectively at -150 V. The erosion resistance of the TiAlSiN coatings is consistent with these mechanical changes at various bias voltages and is also optimal at -150 V, which is -14 times that of TC6 substrate. The failure mechanism comes from coating brittleness nature, fractured chips and microcracks, regardless sand erosion angles, yet the driving forces are different
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