13,668 research outputs found
Dr. Lin Sun, CAU, March 2013
No full textThis video is a conversation with Dr. Lin Sun. Dr. Sun talks about an exhibit at the Woodruff Library titled "At The Boundary." Jordan Moore, AUC Woodruff Library, is the interviewer
An Analysis of <i>Judge Lin</i>
No full textBiography of Lin Wen Zhong Gong has another way to call, that is Judge Lin. The leading character is Lin Ze-Xu. This book is based on functionary experience of Lin Ze-Xu, with the captivating plots of court case, helping by highly skilled military attach\uc3\ua9s and chivalrous knights, and the history facts of Opium War. It makes Lin Ze-Xu\ue2s Confucian temperament and tragic mood more, also contrasts with author\ue2s sorrow and furiousness for the politics at the time. History, court case, martial arts\ue2\ua6\ue2\ua6etc. are essence of this book and it broadens the way of this writing style.
The topic of the thesis is \ue2An Analysis of Judge Lin\ue2. The following thesis will be divided into six different chapters. The introduction is Chapter one of the thesis, which is including researching motive and purpose, literature review of predecessors, researching version by existing information, raising questions, choosing research methods and arranging chapters. In chapter Two, I discuss the study of characters of Lin Ze-Xu, also makes a deep analysis of author\u27s purpose of writing him. In chapter Three, I analyze supporting actors and actress. Meanwhile, I illustrate author\u27s purpose of writing supporting actress because the author had different manner to describe supporting actress. Moving to the Chapter Four, I mainly focus on the plots of Judge Lin, and organize cases of Lin Ze-Xu and his subordinates to understand features of cases. In Chapter Five, I represent the causes of Opium War. China and England had difference of opinions of opium. Therefore, it is easier to comprehend what the author\u27s purpose is. In the last chapter I summarize the main points of the preceding chapters and confirm particularity of Judge Lin
Learning 3D Part Assembly from a Single Image
No full textAutonomous assembly is a crucial capability for robots in many applications. For this task, several problems such as obstacle avoidance, motion planning, and actuator control have been extensively studied in robotics. However, when it comes to task specification, the space of possibilities remains underexplored. Towards this end, we introduce a novel problem, single-image-guided 3D part assembly, along with a learning-based solution. We study this problem in the setting of furniture assembly from a given complete set of parts and a single image depicting the entire assembled object. Multiple challenges exist in this setting, including handling ambiguity among parts (e.g., slats in a chair back and leg stretchers) and 3D pose prediction for parts and part subassemblies, whether visible or occluded. We address these issues by proposing a two-module pipeline that leverages strong 2D-3D correspondences and assembly-oriented graph message-passing to infer part relationships. In experiments with a PartNet-based synthetic benchmark, we demonstrate the effectiveness of our framework as compared with three baseline approaches (code and data available at https://github.com/AntheaLi/3DPartAssembly)
Design of high frequency ultrasonic array transducers for medical imaging
No full textUltrasonic transducers have been widely used in the medical applications. High frequency array transducers have recently attracted many research interests, since it provides not only the electronic beamforming but also the very fine image resolution. The transducers are usually either annular or linear arrays. This study concentrates on the design of both types of array in high frequency applications.The annular array is firstly investigated, and an optimized design of array geometry is developed including the kerfs influence which is usually neglected in the design of high frequency arrays. The improved imaging performance is found by this optimized design. More interestingly, the conventional annular array with element having the same surface area has a relatively large sidelobe closest to the main lobe. Two methods are applied to suppress the sidelobe. The method of using high-impedance single matching to enlarge the element bandwidth only shows very limited lobe suppression, however, a novel matching approach is found. Another method of changing the array geometry from equal area elements to equal width ones successfully suppressed the sidelobe. The imaging results suggest that the novel equal width array shows a good improvement.The linear array is then analyzed. The kerfs influence again is found to be significant for the array especially for high frequency. It is essential to use a high attenuated kerfs material in the linear array design. More importantly, the limitation of current fabrication techniques forces the linear array to concede a high grating lobe in the imaging field if it operates in a relatively high frequency. A novel linear array is developed to suppress the grating lobe without using advanced fabrication techniques. The imaging results show that the novel linear array has a general reduction of -6dB for the lobe suppression. The novel design made the linear array operate in a very high frequency without strong grating lobe, and the array can be fabricated by current techniques
The CO2 adsorption on modified ordered mesoporous carbon
No full text本研究以水熱法合成高比表面積之規則中孔洞碳材（OMC），以硝酸氧化修飾中孔洞碳材（OMCA），增加含氧之官能基，之後以迴流嫁接法接合不同胺基批覆量（5、10及20 wt%）及不同種類之胺基分子（四乙烯戊胺，Tetraethylenepentamine，TEPA；三（2-胺基乙基）胺，Tris（2-aminoethyl）amine，TAEA；聚乙烯亞胺，Polyethylenimine，PEI）進行胺基修飾。利用X光粉末繞射儀（XRD）、氮氣等溫吸附-脫附儀（BET）、場發射式掃描電子顯微鏡（FESEM）及穿透式電子顯微鏡（TEM）鑑定所製備的中孔洞碳材之結構及外觀形貌，以傅立葉轉換紅外光譜儀（FTIR）及元素分析儀（EA）探討材料之表面官能基及元素含量，並鑑定胺基修飾材料之表面接合胺基量及孔徑大小差異。在二氧化碳吸附測定方面，利用重量法及體積法評估材料的二氧化碳吸附量，並計算出胺基之氮原子利用效率（CO2/N ratio）。最後利用原位紅外光譜儀（In-situ FTIR）判斷二氧化碳吸附後之產物，以解釋反應機制。 實驗結果顯示，在TEPA及TAEA方面，10 wt%為最適批覆量，而OMCA- TEPA-10有最高之吸附量，多於OMCA-TAEA-10及OMCA-PEI-10。體積法之結果顯示，OMCA-TEPA-10有最高之化學吸附量，13.23 μg/m2，多於OMCA-TAEA-10之12.96 μg/m2，及OMCA-PEI-10之7.03 μg/m2。然而在氮原子利用效率上，OMCA-TEPA-10卻為最低值0.027，低於OMCA-TAEA-10之0.037及OMCA-PEI-10之0.031，此因TEPA之長直鏈分子的立體障礙所導致。在原位紅外光譜儀的結果，則發現三種胺基有carbamic acid及carbamate的共同吸附產物，且吸附產物在不同溫度下的訊號強弱變化趨勢與化學吸附量之變化趨勢相同。1In this study, the ordered mesoporous carbon (OMC) with high surface areas and high pore volume was prepared by hydrothermal method, and then modified by nitric acid solution, which was named OMCA. OMCA materials were modified by grafting different amine separately, which were tetraethylenepentamine (TEPA) , tris（2-aminoethyl）amine (TAEA) and polyethylenimine (PEI), and loaded with varied amounts (5, 10 and 20 wt%). The textual, structural properties, and surface morphology of all prepared materials were characterized by powder X-ray diffraction (XRD), N2 sorption isotherms, transmission electron microscopy(TEM) and Fourier transform infrared (FTIR) spectroscopy. Carbon dioxide capture capacity of amine-modified mesoporous carbon was obtained by thermogravimetric analysis (TGA) and volumetric adsorption analyzer (BET); the latter was also used to investigate the adsorption performance on CO2/N ratio. The reaction mechanisms of CO2 adsorption on amine-grafted OMCA were confirmed by infrared spectroscopy. The experimental results indicated that the optimal amine loaded amount is 10 wt% for OMCA-TEPA and OMCA-TAEA material. OMCA-TEPA-10 has highest adsorption amount. The results of the volumetric method showed that OMCA- TEPA-10 also had the highest chemical adsorption amounts, 13.23 μg/m2,which was more than OMCA-TAEA-10, 12.96 μg/m2 and OMCA-PEI-10, 7.03 μg/m2. The CO2/N molar ratio were 0.027、0.037 and 0.031, respectively. OMCA-TEPA-10 had highest chemical adsorption amounts but lowest CO2/N ratio due to the steric hindrance. By in-situ FTIR spectroscopy, we showed that the amine groups reacted with CO2 and formed carbamic acids and carbamate under dry conditions. The intensities of ammonium carbamate, carbamic acids and carbamate changed with temperature, and the chemical adsorption intensities had the same trends
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Lowest electronic states of neutral and ionic LiN
No full textWe have investigated the potential energy curves (PECs) of the LiN heteronuclear diatomic molecule, including its ionic species LiN+ and LiN−, using explicitly correlated multi-reference configuration interaction (MRCI-F12) calculations in conjunction with the correlation consistent quintuple- basis set. The effect of core–valence correlation, scalar relativistic effects, and the size of the basis sets has been investigated. A comprehensive set of spectroscopic constants determined based on the above-mentioned calculations are also reported for the lowest electronic states and all systems, including dissociation energies, harmonic and anharmonic vibrational frequencies, and rotational constants. Additional parameters, such as the dipole moments, equilibrium spin-orbit constants, excitation energies, and rovibrational energy levels, are also documented. We found that the three triplet states of LiN, namely, X 3∑−, A 3Π, and 2 3∑−, exhibit substantial potential wells in the PEC diagrams, while the quintet states are repulsive in nature. The ground state of the anion also shows a deep potential well in the vicinity of its equilibrium geometry. In contrast, the ground and excited states of the cation are very loosely bound. Charge transfer properties of each of these states are also analyzed to obtain an in-depth understanding of the interatomic interactions. We found that the core–valence correlation has a substantial effect on the calculated spectroscopic constants.Green Open Access added to TU Delft Institutional Repository ‘You share, we take care!’ – Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Atmospheric Remote Sensin
William E. Hoy, letter to Mr. Ralph Elliot Lin Weber, July 8, 1943, with envelope and newspaper articles
No full textThis letter was sent from William E. Hoy to Mr. Ralph Elliot Lin Weber and is dated July 8, 1943. The letter recounts information about the only baseball game where Hoy, a deaf athlete, was at-bat against Taylor, also a deaf athlete. Mentioned in the letter is a typewritten play by play of the same game, copied from the Enquirer of May 17, 1902. Also included is an envelope and newspaper articles. The envelope, from International League Information, is addressed to Ralph E Lin Weber and has handwritten lists of players of N.Y. and Cincinnati. The newspaper articles are from the Dayton Daily News and the Cincinnati Enquirer and feature pictures of William E. Hoy, the author of the letter
Does Downloading PowerPoint Slides Before the Lecture Lead to Better Student Achievement?: Reply
No full textThis reply responds to a comment by Cannon (2011) that opens the debate on consistency of the effect of downloading PowerPoint slides before lectures on students’ exam performance. Cannon (2011) points out potential endogeneity problems in Chen and Lin (2008) and attempts to explore the unconditional mean effect of downloading PowerPoint slides for the full sample. In this reply, we firstly argue that the estimates in our original article are consistent since the effect of interest is the “conditional†treatment effect but not the unconditional mean effect. We provide explanations for our rationale of estimating the “conditional†treatment effect. Secondly, we propose a modified downloading variable to replicate Cannon’s analysis. Our results suggest that downloading PowerPoint slides before the exam does not produce a significant effect on absent students’ exam performance which is different from the results in Cannon (2011). Our analysis does support Cannon’s argument that students fixed effects are different across different attendance status.
Transverse-electric Brewster effect enabled by nonmagnetic two-dimensional materials
No full textDiscovered in the 19th century, the Brewster effect is known to occur for transverse-magnetic waves in regular optical dielectrics; however, it is believed to arise for transverse-electric (TE) waves only in systems with magnetic responses, i.e., nonunity effective relative permeability. This paper introduces a scheme to realize the TE Brewster effect in a homogeneous dielectric interface without magnetic responses, by adding ultrathin two-dimensional (2D) materials such as graphene. In particular, the effect remains even for waves approaching normal incidence, spanning from terahertz to visible frequencies. In contrast to the conventional Brewster effect, the graphene-assisted TE Brewster effect is asymmetric, and can be achieved only when the incidence is from the higher-refractive-index side. Moreover, graphene layers can tailor a total-internal-reflection dielectric interface into zero reflection, accompanied by perfect absorption. This control over TE waves enabled by ultrathin 2D materials may lead to a variety of applications, such as atomically thin absorbers, polarizers, and antireflection coating.Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (W911NF-13-D-0001)Solid-State Solar-Thermal Energy Conversion Center (DESC0001299
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