IDENTIFICATION OF THE INFLUENCE OF THE SPATIAL ORIENTATION OF THE DEPOSITED LAYERS, AS WELL AS THEIR OVERLAP COEFFICIENT ON THE SURFACE SHAPE ERROR DURING ADDITIVE SHAPING BY AN ELECTRIC ARC

Статья посвящена изучению вопросов управления процессом аддитивного формообразования изделий. Представлены результаты исследования процесса аддитивного формообразования поверхности электрической дугой в среде защитного газа. Проведен анализ погрешности формы поверхностей, полученных с различным заполнением слоев. Подтверждено экспериментально, что такие параметры процесса, как ориентация слоев, коэффициент их перекрытия являются значимыми. Так, погрешность формообразования образцов наплавки слой на слой в вертикальном направлении выше по сравнению с другими способами наплавки, реализованными в эксперименте. Средние значения погрешности формы образцов составляют 0,75 мм, 0,88 мм, 1,15 мм, соответственно, для способов наплавки слой к слою на горизонтальную поверхность с коэффициентом перекрытия 0,3, слой к слою на горизонтальную поверхность с коэффициентом перекрытия 0,5, слой на слой в вертикальном направлении. Максимальные значения погрешности определены на уровне 0,85 мм, 1,2 мм, 1,5 мм для соответствующих способов наплавки, реализованных в эксперименте. Таким образом, пространственная ориентация слоев, а также коэффициент перекрытия слоев являются значимыми, оказывают влияние на численное значение погрешности формы получаемой поверхности, должны быть учтены при проектировании алгоритмов разделения на слои, их заполнения при аддитивном формообразовании электрической дугой в среде защитного газа The article is devoted to the study of the issues of managing the process of additive shaping of products. The paper presents the results of a study of the process of additive surface shaping by an electric arc in a protective gas medium. We analyzed the error of the shape of the surfaces obtained with different filling layers. We confirmed experimentally that such process parameters as the orientation of the layers, their overlap coefficient are significant. Thus, the error of forming samples of surfacing layer on layer in the vertical direction is higher compared to other methods of surfacing implemented in the experiment. The average values of the sample shape error are 0.75 mm, 0.88 mm, 1.15 mm, respectively, for methods of surfacing layer to layer on a horizontal surface with an overlap coefficient of 0.3, layer to layer on a horizontal surface with an overlap coefficient of 0.5, layer to layer in the vertical direction. The maximum error values are determined at the level of 0.85 mm, 1.2 mm, 1.5 mm for the corresponding surfacing methods implemented in the experiment. Thus, the spatial orientation of the layers, as well as the overlap coefficient of the layers, are significant, affect the numerical value of the shape error of the resulting surface, should be taken into account when designing algorithms for dividing into layers, filling them with additive shaping by an electric arc in a protective gas medium

Effects of Elevated Temperature on Root System Development of Two Lupine Species

The aim of this study was to assess the effect of elevated temperature on the growth, morphology and spatial orientation of lupine roots at the initial stages of development and on the formation of lupine root architecture at later stages. Two lupine species were studied—the invasive Lupinus polyphyllus Lindl. and the non-invasive L. luteus L. The plants were grown in climate chambers under 25 °C and simulated warming at 30 °C conditions. The angle of root curvature towards the vector of gravity was measured at the 48th hour of growth, and during a 4-h period after 90° reorientation. Root biometrical, histological measurements were carried out on 7-day-old and 30-day-old plants. The elevation of 5 °C affected root formation of the two lupine species differently. The initial roots of L. polyphyllus were characterized by worse spatial orientation, reduced growth and reduced mitotic index of root apical meristem at 30 °C compared with 25 °C. The length of primary roots of 30-day-old lupines and the number of lateral roots decreased by 14% and 16%, respectively. More intense root development and formation were observed in non-invasive L. luteus at 30 °C. Our results provide important information on the effect of elevated temperature on the formation of root architecture in two lupine species and suggest that global warming may impact the invasiveness of these species.

Head Removal Enhances Planarian Electrotaxis

Sensing electric fields is an ability that certain animal species utilize for communication, hunting, and spatial orientation. Freshwater planarians move toward the cathode in a static electric field (cathodic electrotaxis). First described by Raymond Pearl more than a century ago, planarian electrotaxis has received little attention and the underlying mechanisms and evolutionary significance remain unknown. We developed an apparatus and scoring metrics for automated quantitative and mechanistic studies of planarian behavior upon exposure to a static electric field. Using this automated setup, we characterized electrotaxis in the planarian Dugesia japonica and found that this species responds to voltage instead of to current, in contrast to results from previous studies using other species. Because longer planarians exhibited more robust electrotaxis than shorter planarians, we hypothesized that signals from the head impede cathodic electrotaxis. To test this hypothesis, we took advantage of the regenerative abilities of planarians and compared electrotaxis in head and tail fragments of various lengths. We found that tail and trunk fragments electrotaxed while head fragments did not, regardless of size. However, we could restore cathodic electrotaxis in head fragments via decapitation, demonstrating that the presence of the head impaired cathodic electrotaxis. This result is in stark contrast to other stimulated behaviors such as phototaxis, thermotaxis or chemotaxis, which are weaker or absent in headless fragments. Thus, electrotaxis may be an important ability of headless planarian fragments to support survival prior to head regeneration.

Social and Cultural Influences on Traditional Balinese House Pattern in the Highland Areas of Eastern Bali

The design of a traditional Balinese house is based on the polarity principle, which states that the world is divided into two opposing poles. As a result, the orientation and form of space influence the physical landscape of Bali, including house plans. The topography of Bali, with the plateau running through the center of the island from west to east, causes changes in the spatial orientation system in various locations throughout the island. This condition is due to the fact that spirituality is based on geography, with high areas thought to be the abodes of the gods. As a result, the spatial orientation patterns of the island's southern and northern regions differ. Furthermore, many settlements in the eastern part of the island of Bali have unique pattern variations due to the island's unique orientation system. This individuality has an impact on local customs, such as traditional house design. To investigate this uniqueness, this article examines traditional residential patterns in several villages in eastern Bali. It investigates through the examination of buildings and exposure to developments and spatial changes associated with people's daily activities. This approach includes visual analysis and stories about community cultural activities. Geographic orientation, according to this study, has an impact on settlement patterns. Even though they are close to one another, the spatial layout of customary settlements differs.

The Spatial Orientation and Interaction of Cell Wall Polymers in Bamboo Revealed with a Combination of Imaging Polarized FTIR and Directional Chemical Removal

The mechanical and physical properties of lignocellulosic materials are closely related to the orientation and interaction of the polymers within cell walls. In this work, Imaging Polarized FTIR, combined with directional chemical removal, was applied to characterize the spatial orientation and interaction of cell wall polymers in bamboo fibers and parenchyma cells from two bamboo species. The results demonstrate the cellulose in bamboo fibers is nearly axially oriented whereas it is almost transversely arranged in parenchyma cells. Xylan and lignin are both preferentially oriented alongside cellulose, but with less orientation degre in the parenchyma cells. After lignin removal, the average orientation of xylan and cellulose is little affected, suggesting a strong interaction between cellulose and xylan. Meanwhile, the alkaline treatment significantly weakens the orientation of lignin in both fibers and parenchyma cells, and more significant for the latter, indicating the easy-degradable nature of lignin in parenchyma cells. And, it seemed the lignin and xylan in fibers were more difficult to be removed as compared to parenchyma cells, supporting the assumption that stronger interaction exists between lignin and xylan in the fibers. In a word, it was believed parenchyma cells are more suitable for biorefinery owing to its less ordered and relatively loose molecular assembly, as compared to fibers.

Laboratory Measurements to Image Endobenthos and Bioturbation with a High-Frequency 3D Seismic Lander

The presented 3D seismic system operates three transducers (130 kHz) from a stationary lander and allows non-destructive imaging of small-scale objects within the top decimeters of silty sediments, covering a surface area of 0.2 m2. In laboratory experiments, samples such as shells, stones, and gummy worms of varied sizes (down to approx. 1 cm diameter) could be located in the 3D seismic cube to a depth of more than 20 cm and differentiated by a reflected amplitude intensity and spatial orientation. In addition, simulated bioturbation structures could be imaged. In a practical application, the system allows to determine the abundance of endobenthos and its dynamic in muddy deposits in-situ and thus identify the intensity of local bioturbation.

ANALISIS KEMAMPUAN SPASIAL MATEMATIS DITINJAU DARI PERBEDAAN GENDER SISWA KELAS VIII

ABSTRAKPenelitian ini bertujuan untuk mendeskripsikan kemampuan spasial matematis siswa yang ditinjau berdasarkan perbedaan gender pada pelajaran matematika Pokok Bahasan Bangun Ruang Sisi Datar kelas VIII. Populasi dalam penelitian ini adalah siswa kelas VIII SMP Negeri 2 Praya. Subjek penelitian ini adalah 4 orang siswa dari 27 siswa kelas VIII dengan ketentuan 2 subjek bergender laki-laki dan 2 subjek bergender perempuan yang memiliki kemampuan spasial matematis tertinggi dari semua siswa. Instrumen yang digunakan dalam penelitian ini adalah tes kemampuan spasial matematis dan wawancara. Teknis analisis data dilakukan dengan cara mereduksi data, menyajikan data, dan menarik kesimpulan. Pengecekan keabsahan data menggunakan triangulasi teknik. Hasil penelitian menunjukkan bahwa pada kemampuan spasial visualization subjek laki-laki dan subjek perempuan memiliki kemampuan yang sama ditunjukkan dari kemampuan dalam menentukan komposisi suatu objek setelah dimanipulasi posisi dan bentuknya. Sedangkan dalam menyelesakan masalah yang terkait dengan spatial orientation dan spatial relation subjek laki-laki lebih dominan menggunakan kemampuan spasialnya dibandingkan subjek perempuan.Kata Kunci: Gender, Kemampuan Spasial Matematis ABSTRACTThis study aims to describe the students' mathematical spatial abilities based on gender differences in the VIII grade Mathematics subject. The population in this study were eighth grade students of SMP Negeri 2 Praya. The subjects of this study were 4 students from 27 students of class VIII with the provisions of 2 male gender subjects and 2 female gender subjects who had the highest mathematical spatial ability of all students. The instruments used in this study were tests of mathematical spatial abilities and interviews. Technical data analysis is done by reducing data, presenting data, and drawing conclusions. Checking the validity of the data using triangulation techniques. The results showed that the spatial visualization ability of male subjects and female subjects had the same ability as indicated by the ability to determine the composition of an object after being manipulated in its position and shape. Meanwhile, in solving problems related to spatial orientation and spatial relations, male subjects are more dominant in using their spatial abilities than female subjects.KeywordsGender, Mathematical Spatial Ability

Social and Cultural Influences on Traditional Balinese House Pattern in the Highland Areas of Eastern Bali

The design of a traditional Balinese house is based on the polarity principle, which states that the world is divided into two opposing poles. As a result, the orientation and form of space influence the physical landscape of Bali, including house plans. The topography of Bali, with the plateau running through the center of the island from west to east, causes changes in the spatial orientation system in various locations throughout the island. This condition is due to the fact that spirituality is based on geography, with high areas thought to be the abodes of the gods. As a result, the spatial orientation patterns of the island's southern and northern regions differ. Furthermore, many settlements in the eastern part of the island of Bali have unique pattern variations due to the island's unique orientation system. This individuality has an impact on local customs, such as traditional house design. To investigate this uniqueness, this article examines traditional residential patterns in several villages in eastern Bali. It investigates through the examination of buildings and exposure to developments and spatial changes associated with people's daily activities. This approach includes visual analysis and stories about community cultural activities. Geographic orientation, according to this study, has an impact on settlement patterns. Even though they are close to one another, the spatial layout of customary settlements differs.