bluuebunny/crossref_metadata_2025 huggingface dataset:
Multifocal spectral diffractive lens
Authors:   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Kazanskiy N. ,   Samara National Research University, Bezus E. ,   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS,   Samara National Research University, Doskolovich L. ,   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS,   Samara National Research University
Published: July 2018

We present a method for calculating a spectral multifocal diffractive lens that forms a given set of fixed-position foci at multiple operating wavelengths. It is based on minimizing a function represented as a squared absolute value of difference between the complex amplitudes of beams formed by the relief of a spectral lens at the given wavelengths and the complex transmission functions of multifocal lenses calculated for these wavelengths. As an example, we calculated zone plates that form three fixed foci at three and four operating wavelengths. The results obtained may find application in the development and creation of new multifocal contact and intraocular lenses with reduced chromatic aberrations.
A compact design of a balanced 1×4 optical power splitter based on silicon on insulator slot waveguides
Authors:   Samara National Research University, Butt M. , Reddy A. ,   Samara National Research University, Khonina S. ,   Samara National Research University,   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS
Published: July 2018

In this paper, a compact design of a balanced 1×4 optical power splitter based on coupled mode theory (CMT) is presented. The design consists of seven vertically slotted waveguides based on the silicon-on-insulator platform. The 1×4 OPS is modelled using commercial finite element method (FEM) simulation tool COMSOL Multiphysics 5.1. The optimized OPS is capable of working across the whole C-band with maximum ~39 % of power decay in the wavelength range 1530 – 1565 nm.
Modeling spectral properties of transparent matrix composites containing core-shell nanoparticles
Authors:   Kemerovo State University, Kalenskii A. , Zvekov A. ,   Federal Research Center of Coal and Coal Chemistry SB RAS (Institute of Coal Chemistry and Material Science), Galkina E. ,   Kemerovo State University, Nurmuhametov D. ,   Federal Research Center of Coal and Coal Chemistry SB RAS (Institute of Coal Chemistry and Material Science)
Published: July 2018

Optical properties of transparent matrix composites containing metal nanoparticles coated with an oxide shell were numerically simulated based on the Aden-Kerker theory applicable for concentric spheres. Using pentaerythritol tetranitrate composites (containing Al/Al2O3 nanoparticles) as an example, the linear scattering and absorption coefficients as well as the total reflectance and transmittance and collimated beam transmittance were shown to be determined by the sample thickness, the nanoparticle radius, the mass fraction of nanoparticles, and mass fraction of the oxide in the nanoparticles. An approach to determining the said parameters based on the comparison of the calculated spectral dependencies of the reflectance and transmittance with the experimental ones was suggested. The nanoparticle radius was determined with the minimum error (of about 2-3%), while the nanoparticle mass fraction and oxide mass fraction were weak parameters determined with a 25% error.
Theoretical foundations of hypertrace-transform: scanning techniques, mathematical apparatus and experimental verification
Authors:   Penza State University, Fedotov N. , Syemov A. ,   LLC «KomHelf», Moiseev A. ,   Penza State University
Published: July 2018

We consistently describe the theoretical basis of a new geometric method of analysis and recognition of three-dimensional (3D) images. The description of a scanning technique for forming a hypertrace transform and its mathematical model are given. This method, unlike the existing ones, enables 3D images to be analyzed directly from their 3D shape, without first simplifying them or constructing plane projections. We substantiate the selection of a particular scanning tool and the need to construct a reference spherical grid to address the problem of the rotational invariance of the 3D image recognition. A mathematical apparatus of the stochastic realization of the scanning technique based on stochastic geometry and functional analysis is developed. We introduce a new mathematical tool for 3D image analysis – a hypertrex matrix that allows spatial objects of complex shape and structure to be recognized by constructing a single mathematical model of the 3D image. We describe a new type of 3D image features that have an analytic structure -- hypertryplet features, whose analytical structure makes possible an automatic generation of a large number of features with predetermined properties. Results of the experimental verification are presented, demonstrating the accurate calculation of features for 3D image recognition and proving the adequacy of the developed mathematical apparatus.
Object detection in images with a structural descriptor based on graphs
Authors:   Murom Institute (branch), Vladimir State University named after Alexander and Nikolay Stoletovs, Zakharov A. , Barinov A. ,   Murom Institute (branch), Vladimir State University named after Alexander and Nikolay Stoletovs, Zhiznyakov A. ,   Murom Institute (branch), Vladimir State University named after Alexander and Nikolay Stoletovs, Titov V. ,   Southwest State University
Published: July 2018

We discuss the development of a structural descriptor for object detection in images. The descriptor is based on a graph, whose vertices are the centers of mass of segment features. The embedding of the graph in a vector space is implemented using a Young-Householder decomposition and based on differential geometry. Compound curves are used to describe the relationship between the points. The image graph is described by a matrix of curvature parameters. The distance matrix for the graphs of the candidate object and the reference object is calculated using the Hausdorff metric. A multidimensional scaling method is used to represent the results. Images of test objects and images of human faces are used to study the developed approach. A comparison of the developed descriptor with the Viola-Jones method is performed when detecting a human head in the image. The advantage of the developed approach is the image rotational invariance in the plane while searching for objects. The descriptor can detect objects rotated in space by angles of up to 50 degrees. Using the mass centers of segments of features as the graph vertices makes the approach more robust to changes in image acquisition angles in comparison with the approach that uses image features as the graph vertices.
Constructing a quadratic-exponential FIR-filter with an extended frequency response midrange
Authors:   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Fursov V. ,   Samara National Research University
Published: July 2018

This article is concerned with synthesizing filter with finite impulse response (FIR-filters) employed to correct radially symmetric distortions such as defocusing. We propose a new parametric class of finite impulse response filters (FIR-filters) based on a model of the one-dimensional radially symmetric frequency response. In the proposed method, the one-dimensional frequency response is composed of quadratic and exponential functions. The two-dimensional impulse response of the filter is constructed by sampling one-dimensional impulse responses for all directions. The development consists in introducing an extended mid-frequency region of the frequency response, thus increasing the contribution of the frequencies to image correction. Examples are given in order to illustrate the possibility of the high-quality distortion correction. In particular, it is shown that the proposed method provides the restoration quality higher than that obtained when using an optimal Wiener filter (taken from OpenCV).
Comparative image filter-ing using monotonic morphological operators
Authors:   Federal State Unitary Enterprise “State Research Institute of Aviation Systems” (FGUP “GosNIIAS”), Rubis A. , Lebedev M. ,   Federal State Unitary Enterprise “State Research Institute of Aviation Systems” (FGUP “GosNIIAS”), Vizilter Yu. ,   Federal State Unitary Enterprise “State Research Institute of Aviation Systems” (FGUP “GosNIIAS”), Vygolov O. ,   Federal State Unitary Enterprise “State Research Institute of Aviation Systems” (FGUP “GosNIIAS”), Zheltov S. ,   Federal State Unitary Enterprise “State Research Institute of Aviation Systems” (FGUP “GosNIIAS”)
Published: July 2018

In a previous work, we proposed a Comparative Morphology (CM) construction scheme that generalized Pytyev's Morphological Image Analysis approach onto a wider range of practical image comparison applications. Within a Guided Contrasting framework, a filtering procedure and a related change detection algorithm were developed. In this work, we propose a class of CM filtering in which Mathematical Morphology operators introduced by Serra are used as smoothing operators that offer monotonically non-increasing (non-decreasing) filtering, in contrast to linear diffusion filtering and non-linear median filtering. The results of experiments on change detection based on the new CM filtering are discussed in comparison with other morphological procedures.
Segmentation of 3D meshes combining the artificial neural network classifier and the spectral clustering
Authors:   Laboratory of Informatics, Imaging, and Modeling of Complex Systems (LIIMSC) Faculty of Sciences and Techniques, Hassan 1st University, Zakani F. , Bouksim M. ,   Laboratory of Informatics, Imaging, and Modeling of Complex Systems (LIIMSC) Faculty of Sciences and Techniques, Hassan 1st University, Arhid K. ,   Laboratory of Informatics, Imaging, and Modeling of Complex Systems (LIIMSC) Faculty of Sciences and Techniques, Hassan 1st University, Aboulfatah M. ,   Laboratory of Analysis of Systems and Treatment of Information (LASTI) Faculty of Sciences and Techniques, Hassan 1st University, Gadi T. ,   Laboratory of Informatics, Imaging, and Modeling of Complex Systems (LIIMSC) Faculty of Sciences and Techniques, Hassan 1st University
Published: July 2018

3D mesh segmentation has become an essential step in many applications in 3D shape analysis. In this paper, a new segmentation method is proposed based on a learning approach using the artificial neural networks classifier and the spectral clustering for segmentation. Firstly, a training step is done using the artificial neural network trained on existing segmentation, taken from the ground truth segmentation (done by humane operators) available in the benchmark proposed by Chen et al. to extract the candidate boundaries of a given 3D-model based on a set of geometric criteria. Then, we use this resulted knowledge to construct a new connectivity of the mesh and use the spectral clustering method to segment the 3D mesh into significant parts. Our approach was evaluated using different evaluation metrics. The experiments confirm that the proposed method yields significantly good results and outperforms some of the competitive segmentation methods in the literature.
Algorithm for eliminating gas absorption effects on hyperspectral remote sensing data
Authors:   Keldysh Institute of Applied Mathematics RAS, Nikolaeva O.
Published: July 2018

An efficient algorithm for the elimination of gas absorption effects on the reflectance of sunlight in an atmosphere-ground system is proposed. The algorithm does not require aerosol, surface and gas concentration information. The corrected reflectance is obtained via the correction factor, which is found via analysis of the spectral dependence of reflectance. The algorithm is applicable only to hyperspectral data. Results of testing on model problems are presented.
Comparative analysis of the Fresnel lens and the kinoform lens
Authors:   Penza State University of Architecture and Construction, Greisukh G. , Stepanov S. ,   Penza State University of Architecture and Construction, Antonov A. ,   Penza State University of Architecture and Construction
Published: July 2018

Based on a unified approach in the ray approximation, the focusing properties of Fresnel lenses and kinoform lenses are considered and compared. Particular attention is paid to the energy efficiency, chromatic focal shift and resolving power of these elements. It is shown that the Fresnel lens with same-depth segments is an analogue of the harmonic kinoform lens operating in high diffraction orders. A mechanism of the formation of the diffraction pattern in the focal plane of a Fresnel lens with equidistant annular segments is analyzed. It is shown to differ from the corresponding diffraction pattern formed by a conventional refractive lens by a smaller amount of energy coming to the main maximum and a significant proportion of energy transferred to the side maxima. The target audience of this article is students and graduate students, as well as specialists in the fields of science and technology where optical methods and instruments play an ever increasing role.
Distribution of the complex amplitude and intensity in a 3D scattering pattern formed by the optical system for an on-axis point object
Authors:   St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Koreshev S. , Smorodinov D. ,   St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Nikanorov O. ,   St. Petersburg National Research University of Information Technologies, Mechanics and Optics, Frolova M. ,   St. Petersburg National Research University of Information Technologies, Mechanics and Optics
Published: July 2018

A quantitative evaluation of the depth of field of optical systems is given. Results of the calculation of the distribution of the complex amplitude and intensity in a three-dimensional scattering pattern formed by the optical system for an on-axis point object are presented. The work was carried out as part of developing optical systems with an extended depth of field for a synthesized hologram of a point object located on a perpendicular constructed to the hologram center.
The near-axis backflow of energy in a tightly focused optical vortex with circular polarization
Authors:   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS, Kotlyar V. ,   Samara National Research University, Nalimov A. ,   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS,   Samara National Research University, Stafeev S. ,   Image Processing Systems Institute оf RAS – Branch of the FSRC “Crystallography and Photonics” RAS,   Samara National Research University
Published: July 2018

Using the Richards-Wolf formulae for a diffractive lens, we show that in the focal plane of a sharply focused left-hand circularly polarized optical vortex with the topological charge 2 there is an on-axis backflow of energy (as testified by the negative axial projection of the Poynting vector). The result is corroborated by the FDTD-aided rigorous calculation of the diffraction of a left-hand circularly polarized plane wave by a vortex zone plate with the topological charge 2 and the NA≈1. Moreover, the back- and direct flows of energy are comparable in magnitude. We have also shown that while the backflow of energy takes place on the entire optical axis, it has a maximum value in the focal plane, rapidly decreasing with distance from the focus. The length of a segment along the optical axis at which the modulus of the backflow drops by half (the depth of backflow) almost coincides with the depth of focus, and the transverse circle in which the energy flow is reversed roughly coincides with the Airy disk.
Modeling of arrangement tolerances for the optical elements in a spaceborne Offner imaging hyperspectrometer
Authors:   Joint Stock Company ", Rastorguev A. ,   Rocket and Space Center",   Progress", Kharitonov S. ,   Image Processing Systems Institute of RAS – Branch of the FSRC "Crystallography and Photonics" RAS,   Samara National Research University, Kazanskiy N. ,   Image Processing Systems Institute of RAS – Branch of the FSRC "Crystallography and Photonics" RAS,   Samara National Research University
Published: July 2018

We propose mathematical tools and analyze the quality of an image in the detection plane of an Offner imaging hyperspectrometer, evaluating conditional tolerances for the position of the spectrometer elements. The results of modeling of a combined effect of the arrangement errors show that the probability for the hyperspectrometer to be successfully assembled in compliance with the requirements for image quality is not lower than 0.9.
Visual navigation of an autonomous underwater vehicle based on the global search of image correspondences
Authors:   Computing Center FEB RAS, Kamaev A. , Karmanov D. ,   Computing Center FEB RAS
Published: July 2018

A task of autonomous underwater vehicle (AUV) navigation is considered in the paper. The images obtained from an onboard stereo camera are used to build point clouds attached to a particular AUV position. Quantized SIFT descriptors of points are stored in a metric tree to organize an effective search procedure using a best bin first approach. Correspondences for a new point cloud are searched in a compact group of point clouds that have the largest number of similar descriptors stored in the tree. The new point cloud can be positioned relative to the other clouds without any prior information about the AUV position and uncertainty of this position. This approach increases the reliability of the AUV navigation system and makes it insensitive to data losses, textureless seafloor regions and long passes without trajectory intersections. Several algorithms are described in the paper: an algorithm of point clouds computation, an algorithm for establishing point clouds correspondence, and an algorithm of building groups of potentially linked point clouds to speedup the global search of correspondences. The general navigation algorithm consisting of three parallel subroutines: image adding, search tree updating, and global optimization is also presented. The proposed navigation system is tested on real and synthetic data. Tests on real data showed that the trajectory can be built even for an image sequence with 60% data losses with successive images that have either small or zero overlap. Tests on synthetic data showed that the constructed trajectory is close to the true one even for long missions. The average speed of image processing by the proposed navigation system is about 3 frames per second with a middle-price desktop CPU.
Interpolation based on context modeling for hierarchical compression of multidimensional signals
Authors:   Samara National Research University, Gashnikov M.
Published: July 2018

Context algorithms for interpolation of multidimensional signals in the compression problem are researched. A hierarchical compression method for arbitrary dimension signals is considered. For this method, an interpolation algorithm based on the context modeling is proposed. The algorithm is based on optimizing parameters of the interpolating function in a local neighborhood of the interpolated sample. At the same time, locally optimal parameters found for more decimated scale signal levels are used to interpolate samples of less decimated scale signal levels. The context interpolation algorithm is implemented programmatically as part of a hierarchical compression method. Computational experiments have shown that using a context interpolator instead of an average interpolator makes it possible to significantly improve the efficiency of hierarchical compression.
Abnormal behavior detection based on dense trajectories
Authors:   Lobachevsky State University of Nizhny Novgorod, Shatalin R. , Fidelman V. ,   Lobachevsky State University of Nizhny Novgorod, Ovchinnikov P. ,   Lobachevsky State University of Nizhny Novgorod
Published: July 2018

In this paper, we propose abnormal behavior detection algorithms based on dense trajectories and principal components for video surveillance applications. The result shows that the proposed algorithms are faster than an algorithm based on lengths of displacement vectors but the accuracy is only retained if the bag-of-features model is trained on a balanced sample of behavior features.
Morphological estimates of image complexity and information content
Authors:   Moscow Aviation Institute, Brianskiy S. ,   FGUP “GosNIIAS“, Vizilter Yu. ,   FGUP “GosNIIAS“
Published: July 2018

We propose new morphological conditional estimates of image complexity and information content as well as morphological mutual information. These morphological estimates take into account both the number and the shape of image tessellation (mosaic) regions. We provide such a region shape account via joint use of mosaic image shape models based on the morphological image analysis (MIA) proposed by Yu. Pyt’ev and morphological thickness maps from the mathematical morphology (MM) introduced by J. Serra. Mathematical properties of morphological thickness maps are explored w.r.t. properties of structured elements, and corresponding properties of the proposed morphological image complexity and information content are proved. Some experimental results on image shape comparison in terms of shape complexity and information are reported. Open access images from a Kimia99 database are utilized for these experiments.
Methodology of automatic registration of 3D measurements of bulk materials in granaries
Authors:   M. Kozybayev North-Kazakhstan State University, Astapenko N. , Koshekov K. ,   M. Kozybayev North-Kazakhstan State University, Kolesnikov A. ,   IT company Arbonaut
Published: July 2018

In this article, we propose a technique for automatic contactless measurements of three-dimensional coordinates of surface points in a granary. The need for an automatic measurement and registration of surface points arises when conducting accurate measurements of the volume of bulk materials during stock-taking of raw materials and finished goods. A peculiarity of the technique consists in obtaining and recognizing the surface images in which the sought-for points are highlighted by laser light. The recognition process is closely related to camera specifications and a specific arrangement of laser diodes. The problems considered include the determination of parameters and location of the recording cameras, and the number and layout of the laser diodes, the implementation of 3D measurements from a set of images, and the selection of storage procedures for the measurement results. As a result of the experiments, it was proved that the proposed solution, which exploits the capabilities of photogrammetry and laser scanning methods, has a number of advantages over the existing methods in terms of efficiency, accuracy, the possibility of automation, the opportunity of monitoring the surface of the granary content at any time, and the possibility of remote tracking. Computerization of the described methods allows one not only to perform single volume measurements, but also to carry out a regular contactless monitoring of complex surfaces in locked warehouses for making managerial decisions.
Институциональные аспекты инновационного развития территорий
Authors: Никитская Елена Федоровна , Валишвили Мери Амирановна
Published: July 2018

Основой конкурентоспособности отечественной экономики на мировом рынке является переход к инновационному типу экономического развития, что подразумевает активизацию инновационной деятельности бизнеса и развитие наукоемкого производства как факторов роста. Основным стимулом для развития современной экономики является внедрение новейших. Кроме того процессы формирования экономики нового типа следует рассматривать во взаимосвязи с формированием соответствующих институтов.
Институты, регулирующие инновационные процессы становятся самостоятельными факторами макроэкономического развития. Особое значение приобретают территориальные аспекты пространственного развития экономики государства. Авторами рассмотрена структура и содержание групп норм, заложенных в институты применительно к инновационному процессу. Также в статье рассматривается значение институтов и институций как компонента инновационного развития, а также как объекта территориального регулирования.
Megapensiones y pensioni d’oro: ¿extralimitación de las facultades reglamentarias?
Authors: Perone Giancarlo , Tovar Reyes Sandra Lucía
Published: July 2018

El presente escrito expone el tratamiento jurídico realizado por los ordenamientos italiano y colombiano sobre las llamadas pensioni d’oro y megapensiones, con especial énfasis en la dinámica jurisprudencial y legislativa evidenciada en ambos países. Además de exponer sucintamente las sentencias relevantes al respecto, plantea el problema de la posible extralimitación de las facultades reglamentarias, por lo que se cuestiona la ampliación del régimen a funcionarios distintos de los representantes y senadores en Colombia.
Subsidio por incapacidad como prestación económica a cargo del sistema integral de seguridad social. Aproximaciones a las responsabilidades de los distintos subsistemas
Authors: Dávila Villegas Jorge Mario
Published: July 2018

El subsidio por incapacidad derivada de enfermedad o accidente de origen común es una prestación económica que inicialmente corresponde al empleador y luego, la responsabilidad de su reconocimiento y pago, se traslada al Sistema Integral de Seguridad Social. Del día tres al día ciento ochenta la obligación corresponde al subsistema de salud, en cabeza de la Entidad Promotora de Salud. A partir de allí, y hasta el día quinientos cuarenta, previo el cumplimiento de ciertos requisitos, será el subsistema de pensiones el encargado de asumir el pago de la prestación. En el evento que pasados los quinientos cuarenta días la incapacidad persista, será nuevamente el subsistema de salud el responsable de continuar su pago
GENETIC SOURCES AND NEW SOURCE MATERIAL FOR BREEDING PUMPKINS IN THE LOWER VOLGA REGION
Authors: Nikulina T. M. , Kurunina D. P. , Maslennikova E. S.
Published: July 2018

The results of the research work carried out during the period 2015-2017 are outlined. on the practical selection of pumpkin in the conditions of the Volgograd Transvolga. The results of studying the assortment of pumpkin varieties of domestic and foreign breeding in collection nurseries are presented. The most promising samples adapted to local soil and climatic conditions have high productivity (Sviteny, Chino, Marina di Chioggia, Silber Bell (USA), Kham (Laos), image (Spain), Local (Kazakhstan), Gribovskaya winter, Teshchenka , Zucchini Malchugan, and the quality of the fruit: (Chino, Chirimen nankin (Japan), Cachi JNTA (Argentina), Mantova Uyghur (Kazakhstan), Duchess, Vega F1, Sweetie, Pampushka, Green Warted Habbard (USA). A new hybrid material was obtained, an estimation of its productivity of consumer achestv, stability to bio- and abiotic factors. accessions selected promising superior standards major ecological and morphological and economically valuable traits. The characteristics of the best selected hybrid combinations are given in comparison with the standards. The most productive are hybrid combinations: Marina di Chioggia x Zorka, Zorka x Sweet banana, Silber Bell x Elegant, Sweet x Elegant, Local (Kirghizia) x Zorka, zucchini Mountain Anchor. The yield of these samples exceeds the standards by 13.3-92.2%. The quality of the fruit is distinguished by the hybrids: Marina di Chioggia x Zorka, Zorka x Marina di Chioggia, Pampushka x Elegant, Zorka x Sweet banana, Silber Bell x Elegant, Zaslavia x POOS6-07, Zorka x Oreshek, Altair x Elegant. The content of dry substances in the fruits of these samples is 2.0-8.8% higher than the standards.
THE INFLUENCE OF METHOD STORAGE ON FUNCTIONAL PARAMETERS OF POLLEN OF TABLE BEET
Authors: Kozar E. G. , Vetrova S. A. , Fedorova M. I.
Published: July 2018

When working with pollen, it is important to keep its functional parameters for some time. To do this, you need to choose the best conditions to preserve pollen germination. The influence of different method of pollen storage of inbred plants of beetroot on its functional characteristics, at germination on artificial nutrient medium under conditions in vitro. When storing pollen in eppendorf tube for the second-third day, the pollen germination decreased by 3-10 times compared to the initial value, after a week of storage, pollen was in conglomerates, a lot of burst pollen. When stored on the sprigs for the seventh to eighth days, the decrease in pollen germination was no more than 30% of the control, and the growth rate of the pollen tube in most samples remained approximately at the control level. For a comparative analysis of the germination of pollen of inbred plants beetroot when evaluating a large set of samples, it is recommended to store flowering twigs in paper bags at a reduced temperature (10-12°C). This is important when working with a large set of samples where it is not possible to compare them at the same time.
INFLUENCE OF FERTILIZERS AND GROWTH REGULATOR ON THE CHANGE OF BIOCHEMICAL PROPERTIES OF HYBRIDS OF ONION DURING STORAGE
Authors: Bebris A. R. , Borisov V. A. , Fillrose N. A. , Maslovsky S. A. , Monahos G. F.
Published: July 2018

Research staff All-Russian Scientific Research Institute of Vegetable Growing – Branch of the Federal State Budgetary Scientific Institution Federal Scientific Vegetable Center in collaboration with Russian state agrarian University – Moscow Timiryazev agricultural Academy conducted research (2014-2016) on the effect of fertilizers and plant growth regulators on changes in the quality of onions of the Pervenets F1, Bennito F1 hybrids and Poisk 012 F1 during storage. As a result of research, the greatest effect was obtained from the complex application of N90P90K90 in combination with trace elements (tenso-cocktail) and a growth regulator Zircon. This system allowed to obtain high biochemical parameters of onions. At the end of the 7 months of storage (October-may), the highest dry matter and sugar content and the minimum nitrate content was observed in Pervenets F1 onions, as well as in hybrid Bennito F1. In the latematuring hybrid onions Poisk 012 F1 at the end of storage, the dry matter content decreased to 6,8-7,3%, sugars to 3,6-4,1%, vitamin "C" to 3,2-4,9 mg%, and nitrates increased to 92,1 mg/kg, which led to a decrease in product quality and large losses of onions from diseases and natural losses (up to 48-59%). The main reason for these losses was the lack of maturity of bulbs,low solids and sugars during harvest. It is obvious that for long-term storage it is necessary to use bulbs with a dry matter content of at least 10%. It was found out that feeding of onions during the beginning of the formation of food organizations with potassium nitrate, treatment with a growth regulator of Zircon and a complex of microelements of tenso-cocktail contributes to better preservation of the quality of onions.
CRITERIOS DE DISEÑO SISMICO PARA ESTRUCTURAS INDUSTRIALES
Authors: Meli Roberto
Published: July 2018

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COMENTARIOS AL INCISO 8.6 DE LAS NORMAS TECNICAS COMPLEMENTARIAS PARA DISEÑO POR SISMO
Authors: Damy Julio
Published: July 2018

Muchas fallas en numeroso edificios ocurridas durante los sismos del 19 y 20 de septiembre de 1985, se debieron a grandes torsiones. Aparentemente la mayoría de los edificios dañados tenían grandes excentricidades estáticas, lo que explica su falla (I). Existen indicios que hacen suponer que probablemente las excentricidades se incrementaron cuando algunos de los elementos resistentes incursionaron en el intervalo no lineal, lo que aumentó su demanda de ductilidad. Para considerar estos fenómenos dentro del nuevo Reglamento de Construcción del D.F., se realizó un estudio en el Instituto de Ingeniería de la UNAM, cuyo resumen se presentó en el VII Congreso Nacional de Ingeniería Sísmica efetuado en Querétaro en noviembre de 1987 (1).
FACTOR DE AMPLIFICACION DE LA RESPUESTA DE ESTRUCTURAS CON RESISTENCIA ASIMETRICA
Authors: Ruiz 1 Sonia , Rosas 2 Hector
Published: July 2018

Con el fin de estimar la esperanza de demanda de ductilidad de estructuras con asimetría en su resistencia lateral se obtiene una expresión la cual toma en cuenta el contenido de energía del movimiento sísmico, la aceleración del diseño y la duración de la parte intensa del movimiento. Dicha expresión se obtiene apartir del análisis de 115 estucturas de un grado de libertad, excitadas con diez acelerogramas registrados en las zona blanda y dura de la ciudad de México, y con tres movimientos senoidales modulados.        Los resultados que arroja la expresión calculada en este trabajo se comparan con los correspondientes a las Normas Técnicas complementarias para diseño por sismo del Reglamento de construcciones del Distrito Federal de 1987. Estos últimos resusltan menos conservadores. Se analizan las razones de esta discrepancia.
Respuesta sísmica medida y calculada de un edificio de concreto, sometido al sismo de San Salvador de octubre 10, 1986
Authors: Zurita* Freddy , Meli** Roberto
Published: July 2018

Un edificio de concreto de ocho pisos instrumentado con acelerógrafos en sótano, primer piso azotea soportó el sismo de San Salvador de octubre 10 de 1986 sufriendo sólo ligeros daños no estructurales. La aceleración máxima registrada en la base fue 0.47g y en la azotea 0.91g.                                      Se hace un análisis de los registros obtenidos y se compara la respuesta medida con la que se obtiene de diferentes modelos teóricos de la estructura. Se encuentra que la historia de desplazamientos de la azotea es muy próxima a la que se calcula suponiendo que la estructura permaneció en el intervalo lineal durante el movimiento sísmico. Por otra parte, los momentos flexionantes que se debieron haber generado en los extremos de las vigas para un comportamiento lineal, exceden hasta en 4.6 veces para el positivo y en 2.2 veces para negativo, a los momentos resistentes calculados con los procedimientos usuales de diseño.                                                            Se investigan las posibles fuentes de sobrerresistencia de la estructura y, cuando se toman en cuenta los valores más probables de la resistencia que pudiera tener las distintas secciones, se encuentra que los momentos que debieron haber sido inducido en las vigas por el movimiento en la base excedente hasta en 3.8 veces para el positivo y 1.51 veces para el negativo, a la capacidad teórica de las secciones. El análisis del modelo no lineal indica que debieron haberse presentado demandas de ductilidad locales hasta de 3.7. Se evalúan las posibles causas de estas discrepancias y se analizan algunas repercusiones de los resultados encontrados para la práctica del diseño sísmico.
UN METODO DE LABORATORIO PARA DETERMINAR LOS PARAMETROS DINAMICOS DE LOS SUELOS PARA PEQUEÑOS NIVELES DE DEFORMACION (<10-5)
Authors: Rivera Rigoberto
Published: July 2018

Se expone un método de laboratorio que conduce a la determinación silmultánea del módulo de Young y de la relación de Poisson para deformaciones inferiores a 10-5. El método se basa en el estudio del espectro de resonancias axiales de una barra cilíndrica, en el marco de la teoria elasto-dinámica, que emplea la ecuación de Pochhammer.      La determinación del coeficiente de amortiguamientos se realiza mediante la técnica del ancho de banda, correspondiente a cada frecuencia de resonancia de la probeta de suelo.       En este trabajo se discuten los resultados obtenidos con el método propuesto, en una arena de granulometria uniforme ensayada en estado seco y saturado.
COMPORTAMIENTO DINAMICO DE LAS ARCILLAS DE LA CIUDAD DE MEXICO
Authors: Días Jorge
Published: July 2018

Este artículo es una breve síntesis de las investigaciones llevadas a cabo por el Grupo Dinámicas de Suelos de la DEPFI-UNAM sobre el tema del comportamiento esfuerzo-deformación-tiempo de las ACM, en particular del efecto de la carga cíclica sobre el esfuerzo crítico, 0b. En lo concerniente a la resistencia, se afirma la existencia de una relación umbral de esfurzos dinámicos, RD, que definen dos patrones de comportamiento de la ACM bajo carga cíclica. Se enfatiza la importancia de considerar el efecto del tiempo en la medición del módulo de rígidez y el amortiguamiento de las ACM. Basando en resultados de corte simple cíclico, se propone una forma alterna para definir la relación umbral de esfuerzo cíclico, RD, a través del trabajo histerético acumulado.
ZONACIÓN SÍSMICA PARA MINIMIZACIÓN DEL COSTO TOTAL EN PROBLEMAS REDUCIBLES A UNA DIMENSIÓN
Authors: García Jaime , Rosenblueth Emilio
Published: July 2018

Se aborda aquí el siguente problema: Se desea dividir en zonas una región de sismicidad conocida. En cada zona se especificarán coeficientes de diseño de constantes para los diversos tipos de estructuras que ahí habrán de construirse. Estos coeficientes y las fronteras interzonales deben de minimizar la esperanza del valor presente del costo (inlcuyendo el inicial, el mantenimiento y los de los daños por sismos) de todas las estructuras que se construyan en la región. Llamamos costo total a esta esperanza. Inicialmente tratamos con fronteras irrestrictas. En ciertas condiciones el problema puede conducir a una sola dimensión, aprovechándose entonces un criterio de optimación que se ha desarrollado para catálogos de productos estandarizados. En este trabajo nos limitamos a problemas que satisfacen dichas condiciones. Se muestran aquí que cuando se trata de un solo tipo de estructuras el problema se torna unidimensional, que el criterio de optimación consiste en que sean iguales entre sí los costos totales unitarios de estructuras construidas a ambos lados de una frontera, que las fronteras coincidan con curvas de sismicidad constante y que el planteamiento unidimensional pueda extenderse al caso en que habrá diversos tipos de estructuras siempre que se cumplan ciertas condiciones entre sus costos unitarios y entre los números de estructuras que se construirán de cada tipo. Para resolver el problema presentamos un método iterativo y una variante del de perturbaciones, y los ilustramos mediante ejemplos.
FACTORES DE CARGA ÓPTIMOS PARA EL DISEÑO SÍSMICO DE EDIFICIOS
Authors: Bojórquez Mora Juan , Ruiz Gómez Sonia E.
Published: July 2018

En el presente trabajo se revisan las combinaciones de carga para el diseño de edificaciones que se establecen en el Reglamento de Construcciones del Distrito Federal (RCDF-2004) y sus Normas Técnicas Complementarias (NTC-2004). Se proponen nuevos factores de carga para que se especifiquen en la próxima versión del (RCDF). Se revisa la combinación de carga gravitacional (carga muerta más carga viva) y la combinación de carga por sismo (carga muerta, carga viva y carga por sismo). Se propone una metodología para establecer factores y combinaciones óptimos de carga que garanticen el mínimo costo total esperado durante la vida útil de la estructura y que la probabilidad de falla sea al menos igual a la implícita en el RCDF-2004. Para la estimación de la confiabilidad estructural se hace uso de las Redes Neuronales Artificiales.
Who Wants an iPad? An Exercise In Rationing
Authors: Carr David L. , Allgrunn Michael , Birkeland Kathryn
Published: July 2018

This active learning exercise demonstrates the fundamental problem in economics that resources are scarce, while wants are relatively infinite.  Students are exposed to four mechanisms for rationing scare resources: markets, queue, coupons, and lottery.  An Apple iPad® pre-loaded with music, videos, and games is used as the good to be rationed. The uncertain value of the good allows for differences in willingness to pay.  Students are guided through an exercise that highlights the efficiency/equity tradeoffs in different allocation mechanisms by observing who gets the iPad in each round and whether any secondary market transactions occur to change the allocation.
POTENTIAL OF COMPUTED TOMOGRAPHY IN THE DIAGNOSTICS OF THE LACRIMAL GLAND EPITHELIAL TUMORS
Authors: Yatsenko O. Yu. , Tyurin I. E.
Published: July 2018

Objective. Discussion of the X-ray data in patients with epithelial tumors of the lacrimal gland.

Material and methods.We examined CT scans of 20 patients with  lacrimal gland epithelial tumors (20 orbits). Pleomorphic adenoma  was diagnosed in 9 patients, pleomorphic adenocarcinoma was  diagnosed in 11 patients. The computed tomogtaphy was performed  according to the standard method with obtaining axial and frontal  slices. The slicethickness was 1.0 mm, sliceinterval – 1.0 mm.

Results. The article presents data on the structure of lacrimal gland  epithelial tumors, considering their volume, dimension and density.  Based on the investigation results, the criteria for the differential diagnosis between pleomorphic adenoma and  adenocarcinoma have been established.

Conclusion.Computed tomography is an essential diagnostic technique for a suspected lacrimal gland tumor.  Pleomorphic adenocarcinoma is characterized by a greater density  and more heterogeneous structure compared to pleomorphic  adenoma. Nearly 3/4 of patients with pleomorphic adenocarcinoma  present changes in their orbital walls. The pleomorphic adenoma  can’t be ruled out in patients with the thinning of the orbital wall.
FOSSA NAVICULARIS MAGNA AT THE SKULL BASE: EMBRYOGENESIS AND ITS DETECTION BY COMPUTED TOMOGRAPHY
Authors: Kabak S. L. , Zatochnaya V. V. , Mel’nichenko Yu. M. , Savrasova N. A. , Dorokh E. A.
Published: July 2018

Fossa navicularis magna was detected in multislice spiral computed  tomography in two patients who turned to the medical centers with  pathology of the paranasal sinuses. Its appearance is determined during  the development of the basilar part of the occipital bone and the body of the sphenoid bone in embryogenesis. This fossa has the  appearance of an edge defect on the ventral surface of the clivus in  CBCT scans. Practical radiologist should interpret such a finding as a  congenital anomaly of development, but not as an invasive lesion.
ON THE UNIFICATION OF BONE DENSITOMETRY AND INTERPRETATION OF ITS RESULTS
Authors: Nizovtsova L. A. , Morozov S. P. , Petryaykin A. V. , Bosin V. Yu. , Sergunova K. A. , Vladzimirskiy A. V. , Shantarevich M. Yu.
Published: July 2018

The paper gives data on the importance of osteoporosis, existing  approaches to its diagnosis, the specific features of a dual-energy X- ray absorption procedure to measure bone density, the  determination of main densitometric indicators, such as a T-score  and a Z-score, as well as their interpretation, by predicting the  probability of bone fractures. It shows the need for population-based  studies in Russia to set up a normative bone mineral density  base with regard to age- and gender-related differences and other  factors influencing the bone structure. The concept of a threshold for  intervention is discussed, which determines diagnostic and  therapeutic tactics depending on what risk group a patient belongs  to. It is noted that the surveys conducted among radiologists have  indicated that most specialists are poorly aware of the problem of  osteoporosis, its diagnosis, prevention, and treatment.
La construcción de la identidad nacional a través de los cuadernos escolares en el franquismo en el País Vasco
Authors: Dávila Balsera Paulí , Naya Garmendia Luis Maria
Published: July 2018

Los cuadernos escolares son un buen indicador para conocer el currículum prescrito. En el caso del País Vasco durante el franquismo nos encontramos con dos situaciones claramente contrapuestas, mientras que en las escuelas nacionales se seguía un curriculum donde aparece claramente explícita la ideología franquista, denominada en el primer periodo nacional-católica, en el campo de la resistencia semiclandestina de algunas poblaciones podemos observar que los cuadernos muestran una visión nacionalista desde la perspectiva del nacionalismo vasco. Por lo tanto, se trata de una situación donde el curriculum en las diferentes instituciones está impregnado por dos tipos de nacionalismo: el español y el vasco. En un campo de confrontación nacional, es evidente que el Estado contó con toda sus agentes para imponer su ideología, mientras que en el campo de la resistencia era más débil esta construcción nacional. En los dos casos, la escuela y los cuadernos son un buen agente de transmisión ideológica.
La pedagogía de la imagen: las láminas escolares como recurso histórico y museográfico en la historia de la educación
Authors: Linares María Cristina
Published: July 2018

Las transformaciones en el campo de la técnica permitieron que el recurso de las imágenes impresas fuese masivo a partir del siglo XIX. La invención de la litografía en 1798, permitió ampliar el número de las reproducciones bajando costos y, en el marco de la revolución industrial,  la creación de empresas que se dedicarían a producirlas. Por otro lado, la creación de los sistemas nacionales de educación y la homogenización de contenidos promovieron la expansión de la producción de láminas escolares en el último cuarto del siglo XIX. Desde el punto de vista de la pedagogía, el uso masivo de las imágenes como medio didáctico tiene apenas un poco más de un siglo, aunque podemos rastrear sus orígenes en el siglo XVII. Las láminas escolares tuvieron protagonismo hasta las décadas de 1970/1980 cuando por razones epistemológicas y didácticas muchas de ellas pasaron a formar parte de museos y archivos. La escuela utilizó láminas– en algunos casos las sigue usando - como medios didácticos para la enseñanza, llevando el mundo exterior, muchas veces inalcanzable, a los muros del aula. Nuestra intención es contribuir al recorrido histórico de este auxiliar escolar, y reflexionar sobre las posibilidades de guarda y expositivas en los museos.
Educação em museus: a interação como experiência
Authors: Muller Christine
Published: July 2018

Este trabalho trata da especificidade constitucional da educação em museus, partindo da problemática que essa tipologia educacional tem características em seu funcionamento que a diferenciam de outras modalidades educacionais. Optou-se por um estudo que possibilitasse a compreensão da educação em museus e seus desafios com relação ao público e museus interativos. Dessa forma, o presente estudo tem como objetivo investigar quais processos educacionais são colocados em prática nos museus interativos e compreender os desafios apresentados aos educadores de museus na relação com os visitantes. Para proceder essa discussão, optou-se neste texto por uma abordagem metodológica articulada a um referencial de pesquisa que buscamos na educação em museus, na Nova Museologia e na educação patrimonial.
O Repositório de Conteúdo Digital nas pesquisas de história da educação matemática
Authors: Costa David Antonio , Valente Wagner Rodrigues
Published: July 2018

Este texto apresenta o Repositório de Conteúdo Digital utilizado pelo GHEMAT – Grupo de Estudos de História da Educação Matemática. Este espaço virtual, sediado fisicamente na Universidade Federal de Santa Catarina, abriga as digitalizações dos documentos mobilizados nos projetos em andamento deste grupo de pesquisa. O seu uso tem se demonstrado profícuo pois permite o compartilhamento destas fontes em diversas localidades, potencializando as pesquisas em caráter histórico comparativas realizadas por projetos temáticos envolvendo grande número de pesquisadores nos diversos estados brasileiros. Por fim, são apresentados alguns exemplos de produções acadêmicas do grupo de pesquisa apoiados no uso do Repositório, tanto do ponto de vista de sua elaboração/produção assim como posterior divulgação/publicação.