1,355,871 research outputs found
Hyperspectral image dataset for salt stress phenotyping of wheat
No full textThe dataset contains hyperspectral images of four wheat lines, each with a control and a salt (NaCl) treatment. Images were captured by a hyperspectral camera (PIKA II, Resonon) under natural light condition one day after salt application when there were no visual symptoms in wheat plants. The camera recorded the spectral response of both control and salt tanks of each line over 240 spectral channels in visible and near infrared region (400 nm to 900 nm) with about 2.1 nm spectral resolution, 640 spatial channels in the cross-track direction, and about 1 mm spatial resolution. Raw images were converted to radiance (Wm−2sr−1nm−1) using a vendor-provided calibration file, and then converted to reflectance (%) using a Spectralon panel. In total 25 spectral bands were disregarded due to high noise. Subsequent to noisy band removal, vegetation pixels were segmented from background using spectral vegetation indices and morphological operation. Although the goal of this study was plant phenotyping to rank salt tolerance of wheat lines, this dataset can be used for other research purposes, such as developing classification algorithms to discriminate healthy and stressed plants and developing methods for spectral feature selection to reduce the dimension of hyperspectral images.United States Department of Agriculture-Agricultural Research Service
the National Science Foundation (IOS 1025881 and IOS 1361554)
Minnesota Agricultural Experiment StationMoghimi, Ali; Yang, Ce. (2018). Hyperspectral image dataset for salt stress phenotyping of wheat. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/D69Q3K
UAV-based hyperspectral dataset for high-throughput yield phenotyping in wheat
No full textThe dataset was collected by a hyperspectral camera (PIKA II, Resonon, Inc.) mounted on an unmanned aerial vehicle (UAV, DJI Matrice 600 Pro) from three experimental yield trial fields (C3, C4, and C9) during two consecutive growing seasons 2017 (C3 and C9) and 2018 (C4). The aerial hyperspectral images were captured within two weeks prior to harvest over 240 spectral channels in visible and near infrared region (400 nm to 900 nm) with about 2.1 nm spectral resolution and about 2 cm spatial resolution. Subsequent to radiometric calibration and noisy band removal, plots were cropped from the hyperspectral images and saved as 3D matrices with Matlab (MAT files) and Python (NPY files) format. The dataset entails hyperspectral cubes of 1021 wheat plots and the grain yield of plots harvested by a combine. The corresponding ground truth data (yield) for each hyperspectral cube representing a plot can be found based on the field (e.g., C3, C4, and C9) and plot ID.Moghimi, Ali; Yang, Ce; Anderson, James A.. (2020). UAV-based hyperspectral dataset for high-throughput yield phenotyping in wheat. Retrieved from the University Digital Conservancy, https://doi.org/10.13020/0ch0-vb18
Multi‐scale analysis of dispersive scalar transport across porous media under globally nonlinear flow conditions
No full textWe focus on nonlinear flow regime scenarios observed at the global scale of a porous medium and explore the impact of such nonlinearities on key features of dispersive scalar transport observed across three-dimensional porous systems characterized by various degrees of pore space complexity. Flow and transport processes are analyzed at pore-scale and larger scales in well-documented digital Beadpack and Bentheimer sandstone samples. Our simulations comprise linear (Darcy) and nonlinear (Forchheimer) flow regimes and consider a broad interval of values of Péclet number (ranging from 1 × 10−2–5 × 104). Sample probability density functions of pore-scale velocities and concentrations of the migrating scalar are analyzed and related to flow conditions and degree of complexity of the pore space. Estimated values of dispersion associated with section-averaged breakthrough curves display a power-law scaling on the Péclet number. The scaling exponent depends on the relative importance of pore-scale diffusion and advection. We find that the Forchheimer flow regime is characterized by enhanced mixing of the scalar field. This leads to enhanced dispersion as compared against a Darcy regime
Characterization, crystal structure, and solution studies of a proton transfer compound obtained from 2,6-pyridinedicarboxylic acid and 1,4,10,13-tetraoxa-7,6-diazacyclooctadecane
No full textThe pro ton trans fer com pound, (DA18C6H2)(pydcH)2×0.25H2O, has been pre pared
from the re ac tion be tween 1,4,10,13-tetraoxa-7,16-diazacyclooctadecane,
diaza-18-crown-6 (DA18C6), and 2,6-pyridinedicarboxylic acid, dipicolinic acid
(pydcH2). The char ac ter iza tion was per formed us ing 1H and 13C NMR, IR spec tros copy
and sin gle crys tal X-ray dif frac tion anal y sis. The asym met ric unit con sists of one
(DA18C6H2)2+ cat ion adopt ing a sigmoidal con for ma tion which in ter acts with two
(pydcH)– an ions via hy dro gen bonds in volv ing the protonated amine groups of the
diazacrown ether. –COOH···–OOC– head-to-tail hy dro gen bonds gen er ate 2D un du lat -
ing lay ers along [100] and [001] in the crys tal lat tice. The protonation con stants of
DA18C6 and pydcH2 and equi lib rium con stants for the re ac tion of the two re ac tants were
de ter mined by potentiometric pH ti tra tion. The so lu tion stud ies sup ported the for ma tion
also in so lu tion of (DA18C6H2)(pydcH)2 as the most abun dant spe cies at pH = 3.4
A novel proton transfer self-associated compound from dipicolinic acid and guanidine and its Cadmium(II) complex: synthesis, characterization, crystal structure, and solution studies
No full textA novel 1:2 proton transfer self-associated compound LH2, (GH+)2(pydc2—), was synthesized from the reaction of dipicolinic acid, pydcH2, (2, 6-pyridinedicarboxylic acid), and guanidine hydrochloride, (GH+)(Cl—). The characterization was performed using IR, 1H and 13C NMR spectroscopy and single-crystal X-ray diffraction. LH2 · H2O crystallizes in the space group C2/c of the monoclinic system and contains eight molecules per unit cell. The unit cell dimensions are: a = 26.480(5)Å, b = 8.055(2)Å, c = 14.068(3)Å. The first coordination complex (GH)2[Cd(pydc)2] · 2H2O, was prepared using LH2 and cadmium(II) iodide, and characterized by 1H and 13C NMR spectroscopy and X-ray crystallography. The crystal system is triclinic with space group P1 ̄ with one molecule per unit cell. The unit cell dimensions are: a = 8.5125(7)Å, b = 11.0731(8)Å, c = 13.2404(10)Å. The cadmium(II) atom is six-coordinated with a distorted octahedral geometry. The two pydc2— units are almost perpendicular to each other. The protonation constants of the building blocks of the pydc-guanidine adduct, the equilibrium constants for the reaction of pydc2— with guanidine and the stoichiometry and stability of the Cd2+ complex with LH2 in aqueous solution were accomplished by potentiometric pH titration. The solution studies strongly support a self-association between pydc2— and GH+ with a stoichiometry for the CdII complex similar to that observed for the isolated crystalline complex. In fact, the [Cd(pydc)2]2— complex was found as the most abundant species in solution (> 90 %) at a pH >5
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe 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
Variations on the Author
No full text“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
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
Principles and fundamentals of Islamic management
No full text"The traditional approach to business and public management assumes that management decisions and outcomes will remain the same, irrespective of the environment in which they are applied. However, the value systems operating within a society can also influence the principles that govern modern management within organizations. Principles and Fundamentals of Islamic Management examines the concept of business and public management from the viewpoint of Islam, with close reference to the Quran and other illuminating Islamic sources. Seyed Mohammad Moghimi provides key insights from an Islamic perspective across a comprehensive range of management topics, including planning, decision making and policy making, organizing, human resources management, directing and organizational control. The book concludes by analyzing the role of a company director within an Islamic context. Through this in-depth exploration of Islamic management principles and fundamentals, the author creates a modern and practical framework suitable for use by international business managers. Providing a much-needed insight into the practicalities of management operations in an Islamic context, this book is essential reading for researchers, managers, and for students of Islamic management at both undergraduate and graduate levels"--Back cove
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