352 research outputs found
Get the permission for paper publication--UTiris--Author Siming Zheng--2019-11-10
No full textRequesting the permission for paper publication.Author Siming ZhengWritten date: 2019-11-10</div
Bandgap Engineering of TiO2 for Enhanced Selectivity in Photoelectrochemical Glycerol Oxidation
No full textThe application of photoelectrochemical cells to the partial oxidation of biomass represents a promising avenue as a sustainable process for obtaining valuable products. However, achieving both efficient conversion rates and high selectivity of desired products remains a great challenge. In this study, the photoelectrochemical oxidation of glycerol is investigated to produce dihydroxyacetone (DHA) as the primary target using TiO2 nanotubes (NTs) as the photoanode. Nitrogen doping is used to modify the TiO2 NTs, resulting in enhanced visible light photoactivity in N-doped NTs. These N-doped NTs exhibit a high selectivity toward DHA and show a remarkable faradaic efficiency when irradiated with light at a wavelength of 450 nm, i.e., light that excites N-related states in the band gap of TiO2. The N-doped material also exhibits remarkable stability over prolonged reaction periods. The superior performance of N-doped NTs can be attributed to the band-engineering effects induced by nitrogen doping. Specifically, N-doping leads to an upward shift of the valence band, thereby adjusting the exit energy levels of photogenerated holes that result in a high selectivity toward glycerol conversion to DHA
Author Siming Zheng-Experimental Iris Images--IRIS V.1
No full textUniversity of Tehran IRIS (UTIRIS) image repository is the first iris biometric databank registered in two distinct sessions of Visible Wavelength (VW) and Near InfraRed (NIR) imaging during 24-27th of June 2007
Author-SIMING_ZHENG-20190923--UNIVERSITY OF TEHRAN IRIS IMAGE REPOSITORY--UTIRIS-RGB Original Images
No full textThere are 806 RGB eye(iris) images
Author--SIMING_ZHENG-20190923--UNIVERSITY OF TEHRAN IRIS IMAGE REPOSITORY--UTIRIS-Original RGB Images
No full textThis is the original RGB UTIRIS dataset
Progressive Knowledge Modeling for Pelvic IMRT/VMAT Treatment Planning
No full textAbstractIntensity Modulated Radiation Therapy (IMRT) and Volumetric Modulated Arc Therapy (VMAT) have become effective tools for treating cancer with radiation. Designing a high quality IMRT/VMAT treatment plan is time consuming. Different kinds of knowledge-based methods are being developed to reduce planning time and improve the plan quality by extracting knowledge from previous expert plans to form knowledge models and applying such models to the new patient cases. Currently, these methods are mostly limited to a particular cancer type and therefore various diseases types require training of multiple knowledge models with a large number of cases. To investigate the feasibility of knowledge modeling of IMRT/VMAT treatment planning for multiple cancer types, a progressive study is conducted with a treatment planning knowledge model that quantifies correlations between patient pelvic anatomical features and the OAR sparing features. Low risk prostate plans with relatively simpler PTV-OAR geometry, which is the most common geometry type in previous knowledge based studies, are used to train the model as the starting point of the progressive modeling process. Cases with more complex PTV-OAR anatomies (prostate cancer cases with lymph node irradiation, and anal rectal cancer cases) are added to the training dataset one by one until the model prediction accuracies reach plateau. The DVHs predicted by the knowledge model for bladder, femoral heads and rectum are validated by cases from all three types of cases. Dosimetric parameters are extracted from the predicted DVHs and the corresponding actual plan values measure the prediction accuracy of this multi-disease type model. Further, its accuracy was also compared with the models trained by single disease type cases (including low risk prostate cancer, or type 1, high risk prostate cancer with lymph nodes, or type 2 and anal rectal cancer, or type 3). Prediction accuracy reaches plateau when 6 high risk prostate cancer with lymph nodes irradiation cases and 8 anal rectal cancer cases were added to the training dataset. The determination coefficients R2 for the OARs are: Bladder: 0.90, rectum: 0.64 and femoral heads: 0.82. The prediction accuracies by the multi-disease type model and single-disease type models have no significant differences by F-test (p-value: bladder: 0.58, femoral head: 0.44, rectum: 0.97). Conclusion:Progressive knowledge modeling of OAR sparing for multiple cancer types in in the pelvic region is feasible and has comparable accuracy to single-disease type modeling.</p
Huizhou Natives and the Publishing World of Late Ming China
No full textThis paper examines the participation of natives of Huizhou, Anhui, in the publishing world of the late Ming. The discussion starts with four men in particular : Wu Mianxue, Zheng Siming, Wu Huaibao, and Cheng Juan. The first two worked primarily or exclusively in Nanjing, while the second two were most probably based in Huizhou. All four, however, had numerous professional connections throughout central and southern China and probably throughout the country. The pragmatic ways in which these men utilized their Huizhou connections show their aim to participate in written Chinese culture on a national level. This may explain why they did not consider that their contributions in print had to retain visible marks identifying their geographic origins. Instead, regional solidarity was maintained primarily through highly-developed intellectual, social, and business networks that facilitated Huizhou natives' ascent to cultural, economic, and political prominence on a national level.Cet article analyse l'implication des gens de Huizhou (Anhui) dans le monde de l'édition de la Chine de la fin des Ming. Il se fonde sur la vie de quatre personnes en particulier : Wu Mianxue, Zheng Siming, Wu Huaibao et Cheng Juan. Les deux premiers travaillèrent presque exclusivement à Nankin, tandis que les deux autres furent, selon toute vraisemblance, basés à Huizhou. Tous eurent cependant des échanges professionnels avec d'autres régions de la Chine centrale et méridionale, voire avec le reste du pays. Le pragmatisme dont ces hommes ont fait preuve dans l'utilisation de leur réseau de Huizhou montre qu'ils aspiraient à jouer un rôle dans la culture écrite chinoise à un niveau national. Cela expliquerait pourquoi ils n'ont pas jugé bon que leur production porte de signe distinctif de leur région d'origine. Ainsi, leur solidarité régionale s'exprimait essentiellement via des réseaux intellectuels, sociaux et d'affaires de haute volée, qui facilitaient l'ascension des gens de Hui vers les plus hauts sommets culturels, économiques et politiques du pays.Chia Lucille. Huizhou Natives and the Publishing World of Late Ming China. In: Bulletin de l'Ecole française d'Extrême-Orient. Tome 95-96, 2008. pp. 331-361
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