22,383 research outputs found
Improving the altimetric rain record from Jason-1 & Jason-2
No full textDual-frequency rain-flagging has long been a standard part of altimetric data analysis, both for quality control of the data and for the study of rain itself, because altimeters can provide a finer spatial sampling of rain than can passive microwave instruments. However, there have been many varied implementations, using different records of the surface backscatter and different thresholds. This paper compares four different measures available for the recently-launched Jason-2. The evaluation compares these measures against clearly desired properties, finding that in most cases the adjusted backscatter and that from the ice retracker perform much better than that recommended in the users' handbook. The adjusted backscatter measure also provides a much better link to observations from Jason-1, opening up a much longer period for consistent rain investigations, and enabling greatly improved analysis of the short-scale variability of precipitation. Initial analysis shows that although the spatial and temporal gradients of backscatter increase at very low winds, the spatial gradients in rain attenuation are concentrated where rainfall is greatest, whilst the temporal changes have a simple broad latitudinal pattern
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
Solution strategy and rigid element for nonlinear analysis of elastically structures based on updated Lagrangian formulation
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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.
Target specificity and developmental functions of the let-7 microRNA
No full textlet-7 is a highly conserved microRNA(miRNA) with important functions in a wide variety of biological processes. In the nematode worm Caenorhabditis elegans (C. elegans) let-7 plays a crucial role in developmental timing, regulating temporal cell fates in the stem cell-like seam cell compartment. Study of let-7 in this context served as a useful model system for both elucidation of general principles of miRNA function and definition of universal concepts regarding developmental time and stem-cell biology.
In my thesis work, I was interested in the study of molecular aspects of let-7-mediated target regulation and its developmental functions. I examined these aspects in three separate, but complementary projects.
First, by performing a genome-wide RNAi screen for suppressors of let-7 lethality, I identified about 200 novel let-7 genetic interaction partners. Characterization of these genes revealed a tight connection between let-7 activity and the cell-cycle. Unfortunately, the screed did not yield any obvious and promising candidate let-7 target or upstream regulator for further study.
My second project consisted of establishing a novel, quantitative in vivo miRNA target reporter system and study of let-7-mediated target regulation in different tissues of the worm. This new technique allowed the direct and quantitative visualization of miRNA activity on different targets over time, in various tissues, at a quantitative level. The main finding in these experiments was the demonstration of target specificity among different members of the let-7 family. Even in the same cell and at the same time, individual targets were differentially affected by the loss of a specific family member, showing that they have intrinsically different target specificity. I examined the sequence requirements of let-7 specificity towards lin-41 at the target site level and found that base-pairing at the 3’end of the miRNA contributes to effective and specific repression. However this is probably not sufficient, as I could not transform lin-41 repression completely to be dependent on another let-7 family member by mutating the target site. These findings have clearly further implications for our general understanding of miRNA specificity.
Finally, I characterized developmental defects underlying the lethal vulva bursting phenotype of let-7 mutant worms. I showed that let-7 expression in the vulva is required for bursting suppression. Contrary to previous assumptions, let-7 is not involved in the specification of vulva precursor cells at the L3 stage, but probably has a role in later stages of vulva morphogenesis. In this context, let-60, the worm Ras homologue, is not targeted by let-7 and loss of the let-60 3’UTR and thus miRNA regulation has no functional consequences. By contrast, my experiments show robust regulation of lin-41 in all vulva cells and suggest that lin-41 is the key let-7 target in the vulva. Surprisingly, the let-7/lin-41 pathway does not influence lin-29 expression and lin-29 is, unlike in the hypodermis, not an effector of let-7/lin-41. I discovered and characterized a novel function for the heterochronic genes let-7 and lin-41 in the vulva and showed that the effectors of the heterochronic pathway can be rewired in different tissues.
In sum, I used different approaches to expand our understanding of the molecular and developmental functions of the let-7 miRNA in C. elegans and my results might have further implications for the target specificity of miRNAs
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