1,721,032 research outputs found
Long-chain fatty acid acylated derivatives of isoflavone glycosides from the rhizomes of Iris domestica
No full textLi, Jiayuan, Ni, Gang, Liu, Yanfei, Wang, Renzhong, Yu, Dequan (2022): Long-chain fatty acid acylated derivatives of isoflavone glycosides from the rhizomes of Iris domestica. Phytochemistry (112977) 193: 1-7, DOI: 10.1016/j.phytochem.2021.112977, URL: http://dx.doi.org/10.1016/j.phytochem.2021.11297
Fig. 1. Structures for compounds 1–6 in Long-chain fatty acid acylated derivatives of isoflavone glycosides from the rhizomes of Iris domestica
No full textFig. 1. Structures for compounds 1–6.Published as part of Li, Jiayuan, Ni, Gang, Liu, Yanfei, Wang, Renzhong & Yu, Dequan, 2022, Long-chain fatty acid acylated derivatives of isoflavone glycosides from the rhizomes of Iris domestica, pp. 1-7 in Phytochemistry (112977) 193 on page 2, DOI: 10.1016/j.phytochem.2021.112977, http://zenodo.org/record/819443
Active self-landmarking to mobile robot camera calibration through wireless communications
No full textMobile robotic platforms are becoming more and more popular, both in scientific research and in commercial settings. Robotic systems are useful for going places or performing tasks that are not suitable for humans to do. Robots are often able to precisely perform complicated or dangerous tasks with little or no human involvement. However, before a mobile robotic platform is able to be deployed, it must have a way of identifying where it is in relation to objects and obstacles around it. Often, this is being performed by using a visual system, such as a camera. However, just wiring a camera onto a robot is not sufficient. With many of the tasks that are given to a robotic system to perform, a great deal of precision is required to satisfactorily complete these tasks. This precision requires that the robot be given accurate information by the camera. Most cameras have minor imperfections, even though they are within the manufacturer\u27s tolerances. Some of these imperfections can cause the aspect of the image to be slightly distorted, causing a perfectly square object to appear to be slightly rectangular. This aspect can be corrected with an appropriate scaling factor, reducing or enlarging the size of the image in the horizontal or vertical direction. Other imperfections in the camera manufacturing process can cause the image sensor to not be exactly aligned with the actual camera housing. This can cause the center point of the image to be slightly off of the center of the image sensor (e.g., the image could be shifted to the left by a few pixels, so the center of the image is actually at 317, 240 instead of 320,240). This project will implement a camera calibration algorithm that was developed in [1] on mobile robotic platforms to autonomously determine the center point and correct scaling factors for the platform\u27s respective cameras. These mobile robotic platforms were chosen to be the National Instruments Robotics Starter Kit DaNI. They were programmed using National Instruments graphical programming environment LabVIEW. A robotic platform is to determine the center point and scaling factor of its own camera, using other identical robotic platforms to perform this calibration. The robots can then trade responsibilities, and a different robot can perform the required calibration. This project will also attempt to use wireless communication between the robots, allowing cooperative behavior. This project will also attempt to use the wireless signal strength to determine the locations of the mobile robotic platforms relative to one another
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
STUDENT ATTENTIVENESS CLASSIFICATION USING GEOMETRIC MOMENTS AIDED POSTURE ESTIMATION
No full text Body Posture provides enough information regarding the current state of mind of a person. This idea is used to implement a system that provides feedback to lecturers on how engaging the class has been by identifying the attentive levels of students. This is carried out using the posture information extracted with the help of Mediapipe. A novel method of extracting features are from the key points returned by Mediapipe is proposed. Geometric moments aided features classification performs better than the general distances and angles features classification. In order to extend the single person pose classification to multi person pose classification object detection is implemented. Feedback is generated regarding the entire lecture and provided as the output of the system. </p
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe 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
Tribology of 2D Nanomaterials
No full textFriction and wear between machine pairs always cause excessive energy losses and even mechanical failures in industrial applications. To overcome these problems, researchers have focused on enhancing the performance of lubricants, particularly with regard to reductions in energy dissipation and improved durability. Recently, many 2D materials were used as solid lubricants at the nano/microscales or macroscales, applied as composite fillers, or added to lubricants as additives to enhance lubrication and wear protection performances. These 2D materials exhibit different tribological behaviors, which are valuable to investigate for the development of novel lubrication systems. This reprint is aimed at the most recent discoveries in the tribology of 2D nanomaterials in research and industry
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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