1,663 research outputs found
Retraction Note: Pre-treatment DWI as a predictor of overall survival in locally advanced pancreatic cancer treated with Cyberknife radiotherapy and sequential S-1 therapy
No full textThe authors have retracted this article because Figs. 2, 3 and 4, as well as parts of the text have been previously published [1]. This article is therefore redundant. Yu Zhang, Denghui Liu, Jiaqi Song, Huojun Zhang and Jianping Lu agree to this retraction. Xiaofei Zhu has not responded to any correspondence from the publisher about this retraction
Application of laser-based diagnostics for nanomaterials synthesis:
No full textSpectroscopic laser-based diagnostics are applied in the gas-phase synthesis of nanostructrued materials to make non-intrusive, in-situ, spatially-precise measurements of gas-phase temperatures and relevant chemical species. For the nanomaterials themselves, a novel application of Raman spectroscopy is developed to characterize nanoparticles in-situ, during flame and plasma synthesis. As result, the local conditions for gas-phase synthesis can be determined for a given nanomaterial property, so that fundamental mechanisms can be revealed and process conditions can be optimized.
The synthesis configurations investigated in this work are (i) the inverse co-flow diffusion flame (IDF), (ii) the counter-flow diffusion flame (CDF), (iii) the low-pressure burner-stabilized premixed stagnation-point flame, and (iv) the inductively-coupled plasma (ICP) impinging on a cold substrate.
Spontaneous Raman spectroscopy (SRS) is used to measure local gas-phase conditions in the 2-D axi-symmetric IDF and the quasi 1-D CDF, where nanomaterials are grown on inserted substrates of various compositions. Nitrogen-diluted methane-air flames are examined. Carbon nanotubes (CNTs) are grown catalytically on metal-alloy substrates, and their morphologies are correlated with the local gas-phase temperature and the concentrations of carbon-based precursor species (e.g. C2H2, CO). Zinc oxide (ZnO) nanostructures are grown directly on zinc-plated steel substrates, and their morphologies are correlated with the local gas-phase temperature and the concentrations of oxidative (e.g. O2, H2O, and CO2) and reducing (e.g. H2) species. Computational simulations in 1-D, involving detailed chemical kinetics and transport properties, and in 2-D, using simplified kinetics and transport, are used to validate and improve the measurements.
Laser-induced fluorescence (LIF) is employed to measure the gas-phase temperature profile and OH radical species concentration distribution in a low-pressure, premixed, nitrogen-diluted hydrogen-oxygen, burner-stabilized, stagnation-point flame. Titania nanoparticles are synthesized using a metalorganic precursor. The LIF measurements are compared with computational simulations with detailed chemical kinetics and transport, to affirm the quasi 1-D flow field, as well as to investigate the effects of precursor addition and uniform electric-field application.
SRS is utilized to characterize in-situ the composition and crystallinity of nanoparticles, in aerosol form, produced in the aforementioned low-pressure premixed flame and in the ICP synthesis setup. The Stokes spectra are identified for crystalline phases of TiO2 (and Al2O3 in a different flame setup) and c-BN based on ex-situ-taken spectra from the literature. The in-situ technique is able to delineate the phase conversion of nanoparticles (including amorphous to crystalline) as they evolve in the flow field.Ph.D.Includes bibliographical referencesby Xiaofei Li
sj-docx-1-cll-10.1177_09636897221086971 – Supplemental material for Nonfreezing Low Temperature Maintains the Viability of Menstrual Blood–Derived Endometrial Stem Cells Under Oxygen–Glucose Deprivation Through the Sustained Release of Autophagy-Produced Energy
No full textSupplemental material, sj-docx-1-cll-10.1177_09636897221086971 for Nonfreezing Low Temperature Maintains the Viability of Menstrual Blood–Derived Endometrial Stem Cells Under Oxygen–Glucose Deprivation Through the Sustained Release of Autophagy-Produced Energy by Tongtong Chen, Shenghui Zhang, Hongzhang Jin, Xiaofei Fu, Lingrui Shang, Yilin Lu, Yuliang Sun, Badrul Hisham Yahaya, Yanli Liu and Juntang Lin in Cell Transplantation</p
Airport landscape as open-ended heritage the future of Class A airfields in the UK
No full text"Widely distributed throughout the United Kingdom, Class A airfields have significant potential as open-ended spatial heritage. Given their geometric abstraction and physical patterns, the airfields could be interpreted in unexpected ways in the distant future, as their original technology and purpose become less well understood. To preserve and allow for the potential of such interpretation, the conservation of Class A airfields should focus on general landscape characteristics—with emphasis on scale, patterns, and spatial relationships—rather than original functions and material conditions. Also, alternative uses or development should be allowed on a limited basis. To help guide preservation efforts, a ""toolkit"" of scenario-based categories and a grading system is developed and described. Principles of preservation guidance for contemporary development are outlined through selected case studies, although the vision of Class A airfields as open-ended heritage is based on one of the distant future. This exploration of Class A airfields as open-ended spatial heritage is offered as a sort of proposal to Historic England, a government heritage agency, to develop guidelines for preserving historic airport landscapes. It also casts new light on the topic of airport landscape."Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2018-08-01The student, Xiaofei Shi, accepted the attached license on 2016-07-20 at 15:38.The student, Xiaofei Shi, submitted this Thesis for approval on 2016-07-20 at 15:44.This Thesis was approved for publication on 2016-07-21 at 13:27.DSpace SAF Submission Ingestion Package generated from Vireo submission #10040 on 2016-11-10 at 12:27:35Made available in DSpace on 2016-11-10T18:35:34Z (GMT). No. of bitstreams: 2
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Previous issue date: 2016-07-21Embargo set by: Seth Robbins for item 95395
Lift date: 2018-11-10T18:35:44Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 95395
Lift date: 2018-11-10T18:37:47Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 95395
Lift date: 2018-11-10T18:39:22Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemEmbargo set by: Seth Robbins for item 95395
Lift date: 2018-11-10T18:43:22Z
Reason: Author requested U of Illinois access only (OA after 2yrs) in Vireo ETD systemU of I Only Restriction Lifted for Item 95395 on 2018-11-11T10:15:24Z
Automated measurement of syntactic complexity in corpus-based L2 writing research and implications for writing assessment
No full text Research investigating corpora of English learners’ language raises new questions about how syntactic complexity is defined theoretically and operationally for second language (L2) writing assessment. I show that syntactic complexity is important in construct definitions and L2 writing rating scales as well as in L2 writing research. I describe the operationalizations of syntactic complexity measurement in corpus-based L2 writing research, focusing on the Biber Tagger (Biber, Johansson, Leech, Conrad, & Finegan, 1999), Coh-Metrix (McNamara, Graesser, McCarthy, & Cai, 2014), and L2 Syntactic Complexity Analyzer (Lu, 2010), which are three tools commonly used to automate syntactic complexity analysis. A review of findings from recent corpus-based L2 writing studies on the relationship of syntactic complexity to L2 writing quality follows. I conclude with a discussion of the implications of these multiple perspectives on the definition of syntactic complexity in L2 studies. </jats:p
Study on dielectric and magnetodielectric properties of Lu₃Fe₅O₁₂ ceramics
No full textPolycrystalline Lu₃Fe₅O₁₂ ceramics with garnet structure were prepared by a solid-state reaction method. A dielectric relaxor behavior at low temperature was observed which may come from the dipolar effects associated with the charge carrier hopping between Fe²⁺ and Fe³⁺. It is noticeable that their magnetodielectric (MD) properties are excellent since the applied small magnetic fields can dramatically change the dielectric constants of Lu₃Fe₅O₁₂ ceramics. The origin of the MD effect is discussed.Department of Applied Physic
Effects of Pipeline Construction on Wetland Ecosystems: Russia-ChinaOil Pipeline Project (Mohe-Daqing Section)
No full text
A novel evidential evaluation for internal attacks with Dempster-Shafer theory in WSN
No full textWireless Sensor Network (WSN) consists of low-cost and multifunctional resources constrain nodes that communicate at short distances through wireless links. It is open media and underpinned by an application driven technology for information gathering and processing. It can be used for many different applications range from military implementation in the battlefield, environmental monitoring, health sector as well as emergency response of surveillance. With its nature and application scenario, security of WSN had drawn a great attention. It is known to be valuable to variety of attacks for the construction of nodes and distributed network infrastructure. In order to ensure its functionality especially in malicious environments, security mechanisms are essential. Malicious or internal attacker has gained prominence and poses the most challenging attacks to WSN. Many works have been done to secure WSN from internal attacks but most of it relay on either training data set or predefined threshold. Without a fixed security infrastructure a WSN needs to find the internal attacks is a challenge. Normally, internal attack's node behavioral pattern is different from the other neighbors, called "good nodes," in a system even neighbor nodes can be attacked. In this paper, we use Dempster-Shafer theory (DST) of combined multiple evidences to identify the malicious or internal attacks in a WSN. Moreover, it gives a numerical procedure for fusing together multiple pieces of evidences from unreliable neighbor with higher degree of conflict reliabilit
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