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Journal articles on the topic 'Property segment'

Author: Grafiati

Published: 29 June 2021

Last updated: 1 February 2022

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1

Quan, Heng, and Zhen Ya Gu. "Study on the Influences of Domain Structure of Hydrophilic Polyurethane with Partially Crystalline on its Moisture Permeability." Advanced Materials Research 233-235 (May 2011): 281–87. http://dx.doi.org/10.4028/www.scientific.net/amr.233-235.281.

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Multiphase, segmented polyurethanes with mixed soft segment phase were prepared from 4,4’- diphenylmethane diisocyanate (Pure MDI), polybutylene adipate (glycol) 2000 (PBA2000) and polyethylene glycol 1000 (PEG1000) with 1,4-butanediol (BDO) as the chain extender. Further more, the relationships between domain separation structure, crystallizability of soft segment and moisture permeability, hydrophilic property, phase inversion temperature (PIT) of the polyurethanes were investigated. The studies show that the chemical structure, concentration of hydrophilic soft monomers and the microphase separation degree of the mixed soft segments from hard segment domain have remarkable effects on the application properties of polyurethane.

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2

Ertugrul, Mine, and Erasmo Giambona. "Property Segment and REIT Capital Structure." Journal of Real Estate Finance and Economics 43, no. 4 (January 5, 2010): 505–26. http://dx.doi.org/10.1007/s11146-009-9229-4.

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3

Rogério César dos Santos, Ana Clara Oliveira Comby, and Ramires Vargas da Silva. "A Curious Property of Octagons." Scientific Inquiry and Review 3, no. 2 (June 5, 2019): 01–07. http://dx.doi.org/10.32350/sir.32.01.

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The famous theorem of Van Aubel for quadrilaterals postulates that if squares are built externally on the sides of any quadrilateral, then the two segments that join the opposing centers of these squares are congruent and orthogonal. Inspired by this result and also by the results of Krishna, in this article we will prove the following result of plane geometry: each octagon is associated with a parallelogram, in some cases the parallelogram in question can be degenerate at a point or a segment. This is possible because of complex numbers and basics of analytical geometry.

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4

Liu, Wei, Ruoyu Zhang, Miaoming Huang, Xia Dong, Wei Xu, Yubin Wang, Guo-Hua Hu, and Jin Zhu. "Synthesis and shape memory property of segmented poly(ester urethane) with poly(butylene 1,4-cyclohexanedicarboxylate) as the soft segment." RSC Advances 6, no. 98 (2016): 95527–34. http://dx.doi.org/10.1039/c6ra16325d.

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5

Goodman, S. L., C. Li, S. L. Cooper, and R. M. Albrecht. "HVEM and high resolution SEM of polyurethane bulk and surface structure." Proceedings, annual meeting, Electron Microscopy Society of America 46 (1988): 936–37. http://dx.doi.org/10.1017/s0424820100106740.

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Segmented polyurethanes (PUs) are composed of alternating blocks of crystalline or glassy urethane “hard segments” and rubbery “soft segments.” Chemical incompatability between hard segment (HS) and soft segment (SS) blocks produces a two-phase structure, which accounts for the elastomeric properties of these polymer systems. Polyurethanes are prepared with different HS and SS components, and HS:SS ratios, for various applications. Knowledge of the 3D morphology is necessary to understand polyurethane structure-property relationships. Although conventional transmission electron microscopy can image some polyurethanes, high voltage electron microscopy (HVEM) causes less radiation damage and images thicker samples at higher resolution, thus a sample region may be imaged at multiple tilt angles to provide 3D information. High resolution scanning electron microscopy (HR-SEM) provides complementary information, and at low accelerating voltages (1-3 keV), images near surface structures.Polyurethanes were examined with hard segments of methylene diphenylene diisocyanate (MDI) and 2000 MW soft segments of polytetramethylene oxide (PTMO), polybutadiene (PBD) and polydimethysiloxane (PDMS).

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6

Minagawa, Keiji, Hirokazu Okamura, Seizo Masuda, Masami Tanaka, Naoto Gohko, Yuichi Masubuchi, Jun-Ichi Takimoto, Kiyohito Koyama, and Takashi Uemura. "Preparation and Property of Model Homogeneous ER Fluids Having Urethane Groups." International Journal of Modern Physics B 13, no. 14n16 (June 30, 1999): 1998–2004. http://dx.doi.org/10.1142/s021797929900206x.

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Urethane modified polyether liquids composed of hard and soft segments exhibit either positive or negative ER effect depending on the structure. Here some model compounds of the urethane polymers were synthesized, and the influence of chemical structure, e.g. displacement of hard and soft segments and existence of branches, on the ER effect was studied. It was found that negative ER effect is enhanced by introducing a branched structure in the polyether main-chain or a hard segment at center of the linear polyether.

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7

Wu, Rui, Xuke Zhang, Huabin Shao, Qingping Luo, Jun Yang, and Diping Xu. "Characterization of influenza A virus with nine segments: Effect gene segment on virus property." Research in Veterinary Science 93, no. 2 (October 2012): 1076–80. http://dx.doi.org/10.1016/j.rvsc.2011.12.020.

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8

Jirakittidul, Kittimon, Krittaya Khrongsakun, Kannika Khongkhaw, and Kusuman Nernplod. "Selective Dispersion of Multi-Walled Carbon Nanotubes in Segmented Polyurethane with Different Melt Mixing Process." Key Engineering Materials 730 (February 2017): 237–41. http://dx.doi.org/10.4028/www.scientific.net/kem.730.237.

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Polyurethanes (PU) have been widely used in many applications since their properties can be tailored as desire. In order to improve their electrical property, PU is incorporated with multi-walled carbon nanotubes (MWCNT). The effects of different mixing times and temperatures on selective dispersion of MWCNT in segmented PU were studied. Furthermore, segmented PU based on two different soft segments; i.e. polyester (PU-ester) and polyether (PU-ether), were used. PU/MWCNT nanocomposites were prepared by an internal mixer for 4-12 minutes at 190-210°C. FESEM, DSC and LCR meter were used to characterize morphology and thermal properties. It was found that MWCNT were dispersed in soft segment of PU-ether. Good MWCNT dispersion was able to achieve at high temperature with short mixing time or low temperature with long mixing time. On the other hand, PU-ester/MWCNT nanocomposites, MWCNT preferred to disperse in hard segment and could be dispersed well in PU-ester at low mixing temperature.

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9

Klinedinst, Derek B., Emel Yilgör, Iskender Yilgör, Frederick L. Beyer, Jignesh P. Sheth, and Garth L. Wilkes. "Structure — Property Behavior of New Segmented Polyurethanes and Polyureas Without Use of Chain Extenders." Rubber Chemistry and Technology 78, no. 5 (November 1, 2005): 737–53. http://dx.doi.org/10.5254/1.3547910.

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Abstract New novel segmented polyurethane and polyurea copolymers have been synthesized without chain extenders and the structure-property behavior of these systems has been investigated. It is shown that by the proper choice of diisocyanate and its symmetry, one can obtain highly microphase separated systems without chain extenders and that the materials also display useful mechanical behavior. In particular, it is shown that due to the bidentate hydrogen bonding achieved in the segmented ureas, a significant modulus “service temperature window” is also obtained. It is also verified that not only can strong microphase separation be obtained with low weight fraction hard segment content (14%) but that the hard phase, which is comprised of monodisperse “single molecule” units, also displays a percolated thread-like structure throughout the dominant soft segment material — the latter being based on ca. 1000g/mol polytetramethylene oxide.

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10

Klinedinst, Derek B., Emel Yilgör, Iskender Yilgör, Frederick L. Beyer, and Garth L. Wilkes. "Structure–property behavior of segmented polyurethaneurea copolymers based on an ethylene–butylene soft segment." Polymer 46, no. 23 (November 2005): 10191–201. http://dx.doi.org/10.1016/j.polymer.2005.07.065.

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11

Xiu, Yuying, Dening Wang, Chunpu Hu, Shengkang Ying, and Junxian Li. "Morphology-property relationship of segmented polyurethaneurea: Influences of soft-segment structure and molecular weight." Journal of Applied Polymer Science 48, no. 5 (May 5, 1993): 867–69. http://dx.doi.org/10.1002/app.1993.070480511.

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12

Klusek, Tomasz. "Rozmiary i regionalne zróżnicowanie polskiego rynku nieruchomości rolnych." Zeszyty Naukowe SGGW - Ekonomika i Organizacja Gospodarki Żywnościowej, no. 119 (September 18, 2017): 101–17. http://dx.doi.org/10.22630/eiogz.2017.119.28.

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The property market is not a unite market and therefore depending on employed criteria can be divided into various segments. In order to provide an analysis the objective criterion is most often used. It refl ects functions of particular properties and on such basis the segment of agricultural properties can be distinguished. The data on agricultural property sales in the whole country scale as well as in provinces can be employed for various purposes, particularly for defining of structural changes in agriculture. In order to do so it is necessary to recognise the background of the property sales, their scope and structure which is the topic of the paper.

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13

Titova, S., and O. Babenko. "LAND MARKET AS THE SEGMENT OF THE REAL PROPERTY MARKET." Visnyk Taras Shevchenko National University of Kyiv. Military-Special Sciences, no. 2 (39) (2018): 62–65. http://dx.doi.org/10.17721/1728-2217.2018.39.62-65.

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Analysis of the current state of the land market in the agrarian sector of the economy through the implementation of land reform is carried out.. The objective foundations and content of the institutional mission of the state in the land market, which are determined by the specific characteristics of real estate, are revealed. The preconditions for forming the land market in Ukraine are analyzed and the possible consequences of the introduction of free circulation of agricultural land are determined. A conceptually new direction of the land market study is proposed, which is to reveal the essence of the land as an independent economic category and the forms of its functioning in a particular segment of the market real estate, the inversion character of the land market formation is grounded, and the triple logic of land entry into market turnover is revealed. Keywords: agrarian sector of economy, landmark, non-profit markets, land reform, land lease, land rent, land loan.

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14

Setyadi, Rudy, and Indra Ranggadara. "Augmented reality using features accelerated segment test for property catalogue." TELKOMNIKA (Telecommunication Computing Electronics and Control) 18, no. 1 (February 1, 2020): 140. http://dx.doi.org/10.12928/telkomnika.v18i1.13039.

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15

Rai, Arvind, and Avais Ahmed Khan. "A prospective observational study of branching pattern of middle hepatic vein on contrast enhanced computed tomography." International Surgery Journal 7, no. 8 (July 23, 2020): 2652. http://dx.doi.org/10.18203/2349-2902.isj20203250.

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Background: The main purpose of pre-operative imaging in liver transplantation is to expose the arterial and venous vascular map. Prior to transplantation it is necessary to image the vascular structures property due to complex nature of liver vascular anatomy and its frequent variations. CT is a useful method not only in the determination of hepatic arterial anatomy, hepatic venous anatomy, accessory hepatic veins and portal veins variations.Methods: This was a prospective observational study performed at the department of surgery, Gandhi Medical College Bhopal and study of CECT was carried out in the department of radiodiagnosis with approval from college ethical committee on 100 patients during a period of 2 years from 2017 to 2019.Results: In study of 100 cases were studied. The study mainly done on the MHV mainly its length, width draining segments of liver by MHV and accessory hepatic veins. In overall cases maximum cases had drainage from segment IVb, V and segment VIII. The segment 5 accessory vein is the most common single accessory vein found in the study.Conclusions: Many parameters of MHV have studied in the study and understanding of these parameters is undoubtedly important for operating surgeon its anatomical draining patterns, draining liver segments and has got the presence of the various accessory veins in the liver. Recognition of these accessory hepatic veins is important because some of these accessory veins may become useful in segmental liver transplantation.

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16

Alt, Helmut, Sergio Cabello, Panos Giannopoulos, and Christian Knauer. "Minimum Cell Connection in Line Segment Arrangements." International Journal of Computational Geometry & Applications 27, no. 03 (September 2017): 159–76. http://dx.doi.org/10.1142/s0218195917500017.

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We study the complexity of the following cell connection problems in segment arrangements. Given a set of straight-line segments in the plane and two points [Formula: see text] and [Formula: see text] in different cells of the induced arrangement: [(i)] compute the minimum number of segments one needs to remove so that there is a path connecting [Formula: see text] to [Formula: see text] that does not intersect any of the remaining segments; [(ii)] compute the minimum number of segments one needs to remove so that the arrangement induced by the remaining segments has a single cell. We show that problems (i) and (ii) are NP-hard and discuss some special, tractable cases. Most notably, we provide a near-linear-time algorithm for a variant of problem (i) where the path connecting [Formula: see text] to [Formula: see text] must stay inside a given polygon [Formula: see text] with a constant number of holes, the segments are contained in [Formula: see text], and the endpoints of the segments are on the boundary of [Formula: see text]. The approach for this latter result uses homotopy of paths to group the segments into clusters with the property that either all segments in a cluster or none participate in an optimal solution.

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17

Wu, Xiu-Yun. "L-interval spaces and some of their properties." Journal of Intelligent & Fuzzy Systems 40, no. 1 (January 4, 2021): 13–25. http://dx.doi.org/10.3233/jifs-182525.

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In this paper, notions of L-interval spaces and L-2-arity convex spaces are introduced. It is showed that there is a Galois’s connection between the category of L-convex spaces and the category of L-interval spaces. In particular, the category of L-2-arity convex spaces can be embedded in the category of L-interval spaces as a coreflective subcategory. Further, some properties of L-interval spaces are introduced including L-geometric (resp. L-Peano, L-Pasch and L-sand-glass) property. It is proved that an L-2-arity convex space is an L-JHC convex space iff its segment operator has L-Peano property. It is also proved that an L-JHC convex space with an L-idempotent segment operator has L-sand-glass property. Further, it is also proved that an L-idempotent interval space having L-Peano+L-Pasch property has L-geometric property and L-sand-glass property.

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18

Kuchuk, Nina, Oleksandr Shefer, Galina Cherneva, and Frhat Ali Alnaeri. "Determining the capacity of the self-healing network segment." Advanced Information Systems 5, no. 2 (June 22, 2021): 114–19. http://dx.doi.org/10.20998/2522-9052.2021.2.16.

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An approach to determining the bandwidth of the self-healing segment of the data network is proposed. The subject of the study are autonomous segments of the telecommunications network, which have the property of self-healing. The object of research is the process of information transfer between nodes of an autonomous segment. The scientific novelty is to improve the method of determining the capacity of the self-healing segment of the telecommunications network with limited network resources by applying the criterion of ensuring the minimum time of information delivery at a given limit of possible probability of loss. The following tasks were solved: a mathematical model of the self-healing segment of the telecommunication network in the form of a queuing system was developed; the proposed method of calculating the degree of channel congestion. Conclusion: the proposed approach made it possible to calculate the bandwidth of the communication channels of the self-healing segment of the telecommunications network and the required amount of buffer memory with a known network topology and a given gravity matrix, providing the required values of failure probability and guarantee minimum message delivery time.

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19

Chang, Chih-Yuan, and Wei-Ru Chen. "Influence of processing variables on quality of unsaturated polyester/E-glass fiber composites manufactured by double-bag progressive compression method." Advances in Mechanical Engineering 10, no. 9 (September 2018): 168781401879853. http://dx.doi.org/10.1177/1687814018798531.

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A hybrid process of articulated resin transfer molding and vacuum-assisted resin infusion, called double-bag progressive compression method, has been invented to fabricate composite parts. In double-bag progressive compression method, the secondary bag is divided into several segments. During resin infusion, the double bag is drawn upward by vacuum, and the initial flow resistance offered by the loose preform is low. Once the resin infusion is completed, the vacuum on the segmented bags is progressively released to ambient pressure, and the segmental compression is sequentially performed until unnecessary resin is completely removed. This research is to experimentally investigate the influence of double-bag progressive compression method processing parameters, including vacuum pressure in the cavity, number of segments, initiating time of the next compression, temperature of the heated air, initiating segment of the heated air, initial height of the mold cavity, and excess infused resin, on the mechanical property of the part. The design of experiments adopts Taguchi’s method. Results show that the double-bag progressive compression method significantly reduces total filling time and maximally increases the flexural modulus of the part by 17.81% as compared with the typical vacuum-assisted resin infusion. A preferable parameter condition is proposed by taking both the flexural modulus and the operation complexity into account.

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20

Hu, Yan Ou, Hui Qin Lian, Lei Zu, Yue Ting Li, Yang Liu, Xiu Guo Cui, Zhong Kai Hu, et al. "Effects of Ionic Group on the Shape Memory Performance of Polyurethane." Materials Science Forum 848 (March 2016): 140–47. http://dx.doi.org/10.4028/www.scientific.net/msf.848.140.

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Ionic polyurethane (IPU) was synthesized as shape memory materials. Poly (tetramethylene ether) glycol with 2000g/mol number average molecular weight were used as soft segment, 4,4-methylenebis (phenyl isocyanate), and 1,2-dihydroxy-3-propanesulfonic acid salt were used to compose the segment of SMP materials. The structure and properties of these IPU films were characterized by Fourier Transform infrared, X-ray diffraction, Thermal gravimetric analysis and Differential scanning calorimeter. The results showed that the glass transition temperature of the IPU increased with the increase of hard segment content. The physical properties in terms of swelling property, water absorption and ion-exchange capacity increased with the improving of sulfonic group content in IPU. The shape memory property of IPU exhibited that the shape fixity ratio and recovery rate improved remarkably with the increase of hard segment content.

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21

Feng, Y., and B. Xiao. "Revenue management with two market segments and reserved capacity for priority customers." Advances in Applied Probability 32, no. 03 (September 2000): 800–823. http://dx.doi.org/10.1017/s0001867800010260.

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This paper studies a revenue management problem in which a finite number of substitutable commodities are sold to two different market segments at respective prices. It is required that a certain number of commodities are reserved for the high-price segment to ensure a minimum service level. The two segments are served concurrently at the beginning of the season. To improve revenues, management may choose to close the low-price segment at a time when the chance of selling all items at the high price is promising. The difficulty is determining when such a decision should be made. We derive the exact solution in closed form using the theory of optimal stopping time. We show that the optimal decision is made in reference to a sequence of thresholds in time. These time thresholds take both remaining sales season and inventory into account and exhibit a useful monotone property.

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22

Feng, Y., and B. Xiao. "Revenue management with two market segments and reserved capacity for priority customers." Advances in Applied Probability 32, no. 3 (September 2000): 800–823. http://dx.doi.org/10.1239/aap/1013540245.

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This paper studies a revenue management problem in which a finite number of substitutable commodities are sold to two different market segments at respective prices. It is required that a certain number of commodities are reserved for the high-price segment to ensure a minimum service level. The two segments are served concurrently at the beginning of the season. To improve revenues, management may choose to close the low-price segment at a time when the chance of selling all items at the high price is promising. The difficulty is determining when such a decision should be made. We derive the exact solution in closed form using the theory of optimal stopping time. We show that the optimal decision is made in reference to a sequence of thresholds in time. These time thresholds take both remaining sales season and inventory into account and exhibit a useful monotone property.

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23

Makin, Alexander S. "On Summability of Spectral Expansions Corresponding to the Sturm-Liouville Operator." International Journal of Mathematics and Mathematical Sciences 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/843562.

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We study the completeness property and the basis property of the root function system of the Sturm-Liouville operator defined on the segment [0, 1]. All possible types of two-point boundary conditions are considered.

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24

Westermark, Gunilla T., Ulla Engström, and Per Westermark. "The N-terminal segment of protein AA determines its fibrillogenic property." Biochemical and Biophysical Research Communications 182, no. 1 (January 1992): 27–33. http://dx.doi.org/10.1016/s0006-291x(05)80107-x.

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25

ADACHI, Yusuke, Yuichi AOKI, Yuki OHSONE, Hiroya MURAKAMI, and Naoto OHTAKE. "Tribological Property of Segment-Structured DLC Film Under Oil-Lubrication Condition." Transactions of the Japan Society of Mechanical Engineers Series C 74, no. 737 (2008): 169–73. http://dx.doi.org/10.1299/kikaic.74.169.

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26

Manuel Vaz Pinto Almeida Vasques, Filipe, José Manuel Cardoso Teixeira, and Elísio Fernando Moreira Brandão. "Significance of segment structures in the Portuguese and Iberian property markets." Journal of European Real Estate Research 3, no. 1 (May 11, 2010): 46–58. http://dx.doi.org/10.1108/17539261011040532.

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27

Liu, Feng Jun, and An Lin Fang. "Study on Test Scheme of Shield Tunnel Prestressed Segment Joint." Applied Mechanics and Materials 438-439 (October 2013): 954–58. http://dx.doi.org/10.4028/www.scientific.net/amm.438-439.954.

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Mechanical property of the segment joint for fabricated shield tunnel lining is the key factor for segment lining design and research. Based on the test prototype of shield tunnel segment lining with about 6m diameter, the test scheme of prestressed segment joint has been studied. On account for the influencing factors of prestressing force, prestressed reinforcement shape, joint shape and bending moment, the test structure and test conditions were designed. And the test content and methods were brought out, the test procedure and notes were discussed.

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28

Williams, Sharlene R., David Salas-de la Cruz, Karen I. Winey, and Timothy E. Long. "Ionene segmented block copolymers containing imidazolium cations: Structure–property relationships as a function of hard segment content." Polymer 51, no. 6 (March 2010): 1252–57. http://dx.doi.org/10.1016/j.polymer.2009.06.051.

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29

Trofimov, Ivan D., Nazaria Md Aris, and Dickson C. D. Xuan. "Macroeconomic and Demographic Determinants of Residential Property Prices in Malaysia." Zagreb International Review of Economics and Business 21, no. 2 (November 1, 2018): 71–96. http://dx.doi.org/10.2478/zireb-2018-0015.

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Abstract This paper studies the relationship between residential property prices and macroeconomic and demographic determinants in Malaysia. In the years following the Asian financial crisis, property prices in Malaysia rose substantially, resulting in an affordability crisis and ultimately policy responses to the problem. Using unit root, Johansen-Juselius cointegration, VECM-based Granger causality tests and variance decomposition, and considering quarterly data that covers 2000-2015 period, we established that residential property price growth is principally driven by strong demographic performance and population growth and is backed by the low interest rate environment and rising consumer prices. Household income and level of GDP do not appear to contribute to property price growth. Certain distortions and asymmetries in the Malaysian real estate markets are documented: oversupply in the higher price segment of the market coupled with the lack of affordable housing in the lower price segment; household income growth lagging behind GDP and property price growth, thereby dampening housing demand; growing rental markets in major urban areas as a result of the affordability crisis; and a quality mismatch between buyers’ preferences and housing supply.

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30

Geit, V. E., and N. Zh Geit. "Criteria for the constant sign property for real polynomials on a segment." Russian Mathematics 52, no. 11 (November 2008): 70–75. http://dx.doi.org/10.3103/s1066369x0811008x.

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31

Golshani, Mohammad, and Yair Hayut. "The tree property on a countable segment of successors of singular cardinals." Fundamenta Mathematicae 240, no. 2 (2018): 199–204. http://dx.doi.org/10.4064/fm195-3-2017.

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32

Wang, Charlie C. L., Allan K. K. Chan, and Zhen Xiong Chen. "Segment intenders and non‐intenders in China’s property market: a hybrid approach." Journal of Consumer Marketing 18, no. 4 (July 2001): 319–31. http://dx.doi.org/10.1108/07363760110392994.

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33

Madaminov, Kh M. "Effect of Injection Phenomena on Electrical Properties of pSi--nSi1--xSnx Heterojunctions." Herald of the Bauman Moscow State Technical University. Series Natural Sciences, no. 2 (95) (April 2021): 71–84. http://dx.doi.org/10.18698/1812-3368-2021-2-71-84.

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We studied the current-voltage characteristic of pSi--nSi1--xSnx structures in the temperature range of 293--393 K so as to find out the role of injection phenomena during electrical property formation in pSi--nSi1--xSnх heterojunctions derived from the Si1--xSnx (0 ≤ x ≤ 0.04) solid solution. We established that the current-voltage characteristic of such heterojunctions consists of two typical segments. We determined that an exponential function describes the first current-voltage characteristic segment well. In all current-voltage characteristics the exponential curve is followed by sublinear segments that do not depend on temperature. We show that the theory of injection depletion effect describes these segments well. We used the sublinear segment of the current-voltage characteristic to determine the value of the parameter a, which can be employed to calculate deep level impurity concentration leading to the appearance of the sublinear segment. We prove that the structure under investigation may be considered to be a pSi--nSi1--xSnx--n+Si1--xSnx (0 ≤ x ≤ 0.04) junction with a high-resistance nSi1--xSnx layer. The analysis results make it possible to conclude that charge carrier dissipation on both complex aggregates and nanoinclusions plays a significant role in forming electrophysical properties in the Si1--xSnx (0 ≤ x ≤ 0.04) solid solution and that epitaxial films of Si1--xSnx (0 ≤ x ≤ 0.04) solid solutions derived on silicon substrates are efficient promising materials for developing diodes operating under double injection

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34

Majeed, Abdul, Muhammad Abbas, Amna Abdul Sittar, Mohsin Kamran, Saba Tahseen, and Homan Emadifar. "New Cubic Trigonometric Bezier-Like Functions with Shape Parameter: Curvature and Its Spiral Segment." Journal of Mathematics 2021 (September 13, 2021): 1–13. http://dx.doi.org/10.1155/2021/6330649.

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This work presents the new cubic trigonometric Bézier-type functions with shape parameter. Basis functions and the curve satisfy all properties of classical Bézier curve-like partition of unity, symmetric property, linear independent, geometric invariance, and convex hull property and have been proved. The C 3 and G 3 continuity conditions between two curve segments have also been achieved. To check the applicability of proposed functions, different types of open and closed curves have been constructed. The effect of shape parameter and control points has been observed. It is observed that, by decreasing the value of shape parameter, the curve moves toward the control polygon and vice versa. The CT-Bézier curve is closer to the cubic Bézier curve for a fixed value of shape parameter. The proposed CT-Bézier curve can be used to represent ellipse. Using proposed basis functions, we have constructed the spiral segment which is very useful to construct fair curves and desirable to design trajectories of mobile robots, highway, and railway routes’ designing.

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35

Li, Yue Ting, Hui Qin Lian, Yan Ou Hu, Lei Zu, Xiu Guo Cui, Yang Liu, Yu Peng Liu, and Ben Ze Wu. "Synthesis and Shape Memory Property of a MDI Based Liquid Crystalline Polyurethane." Materials Science Forum 848 (March 2016): 132–39. http://dx.doi.org/10.4028/www.scientific.net/msf.848.132.

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Liquid crystalline polyurethanes (LCPU) were prepared from 4,4’-methylenediphenyl diisocyanate (MDI), 1,6-hexanediol (HDO), 2,2-dimethylol propionic acid (DMPA) and polytetramethylene ether glycol (PTMG). The experiments synthesized three liquid crystalline polyurethane films with different soft/hard segment ratio. Chemical and structural characterization of the polyurethanes were investigated by Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, differential scanning calorimeter and polarized microscopy respectively. Swelling rate and shape memory property were tested. The results indicated that the polyurethane with 62% soft segment and large group of carboxyl displayed excellent swelling and shape memory properties, and the shape recovery rate reached 100%. It was found that the crystallinity, thermal stability decreased and the temperature flexibility, water absorption and shape recovery rate increased with the increase of polytetramethylene ether glycol.

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Das, Sudipto, Iskender Yilgor, Emel Yilgor, Bora Inci, Ozgul Tezgel, Frederick L. Beyer, and Garth L. Wilkes. "Structure–property relationships and melt rheology of segmented, non-chain extended polyureas: Effect of soft segment molecular weight." Polymer 48, no. 1 (January 2007): 290–301. http://dx.doi.org/10.1016/j.polymer.2006.10.029.

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37

Campbell, G. L., and P. M. J. Shelton. "Cell behaviour during postembryonic pattern regulation in the insect abdomen (Oncopeltus fasciatus). I. Regeneration of segment borders." Development 101, no. 2 (October 1, 1987): 221–35. http://dx.doi.org/10.1242/dev.101.2.221.

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The confrontation of cells from the anterior region of an abdominal segment of Oncopeltus with those from the posterior region of the same or the adjacent segment results in the generation of a segment border. The behaviour of epidermal cells during this regulation is described. It consists primarily of cell division and transverse elongation of cells at the site of confrontation. This behaviour can be separated from any associated purely with wound healing because a similar-sized wound to that used to ablate the segment border, performed within the segment, does not result in any cell division or elongation. The results are consistent with the view that there is a discontinuity in positional values at the segment border. The stability of such a discontinuity and the regeneration of segment borders are discussed in terms of there being a special population of cells at the segment border that have the property of isolating other cells with the maximum difference in positional values.

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Barrios, Mariana dos Reis, José Marques Junior, Alan Rodrigo Panosso, Diego Silva Siqueira, and Newton La Scala Junior. "Magnetic susceptibility to identify landscape segments on a detailed scale in the region of Jaboticabal, São Paulo, Brazil." Revista Brasileira de Ciência do Solo 36, no. 4 (August 2012): 1073–82. http://dx.doi.org/10.1590/s0100-06832012000400002.

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The agricultural potential is generally assessed and managed based on a one-dimensional vision of the soil profile, however, the increased appreciation of sustainable production has stimulated studies on faster and more accurate evaluation techniques and methods of the agricultural potential on detailed scales. The objective of this study was to investigate the possibility of using soil magnetic susceptibility for the identification of landscape segments on a detailed scale in the region of Jaboticabal, São Paulo State. The studied area has two slope curvatures: linear and concave, subdivided into three landscape segments: upper slope (US, concave), middle slope (MS, linear) and lower slope (LS, linear). In each of these segments, 20 points were randomly sampled from a database with 207 samples forming a regular grid installed in each landscape segment. The soil physical and chemical properties, CO2 emissions (FCO2) and magnetic susceptibility (MS) of the samples were evaluated represented by: magnetic susceptibility of air-dried fine earth (MS ADFE), magnetic susceptibility of the total sand fraction (MS TS) and magnetic susceptibility of the clay fraction (MS Cl) in the 0.00 - 0.15 m layer. The principal component analysis showed that MS is an important property that can be used to identify landscape segments, because the correlation of this property within the first principal component was high. The hierarchical cluster analysis method identified two groups based on the variables selected by principal component analysis; of the six selected variables, three were related to magnetic susceptibility. The landscape segments were differentiated similarly by the principal component analysis and by the cluster analysis using only the properties with higher discriminatory power. The cluster analysis of MS ADFE, MS TS and MS Cl allowed the formation of three groups that agree with the segment division established in the field. The grouping by cluster analysis indicated MS as a tool that could facilitate the identification of landscape segments and enable the mapping of more homogeneous areas at similar locations.

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Hárosi, Ferenc I., and Iñigo Novales Flamarique. "Functional significance of the taper of vertebrate cone photoreceptors." Journal of General Physiology 139, no. 2 (January 16, 2012): 159–87. http://dx.doi.org/10.1085/jgp.201110692.

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Vertebrate photoreceptors are commonly distinguished based on the shape of their outer segments: those of cones taper, whereas the ones from rods do not. The functional advantages of cone taper, a common occurrence in vertebrate retinas, remain elusive. In this study, we investigate this topic using theoretical analyses aimed at revealing structure–function relationships in photoreceptors. Geometrical optics combined with spectrophotometric and morphological data are used to support the analyses and to test predictions. Three functions are considered for correlations between taper and functionality. The first function proposes that outer segment taper serves to compensate for self-screening of the visual pigment contained within. The second function links outer segment taper to compensation for a signal-to-noise ratio decline along the longitudinal dimension. Both functions are supported by the data: real cones taper more than required for these compensatory roles. The third function relates outer segment taper to the optical properties of the inner compartment whereby the primary determinant is the inner segment’s ability to concentrate light via its ellipsoid. In support of this idea, the rod/cone ratios of primarily diurnal animals are predicted based on a principle of equal light flux gathering between photoreceptors. In addition, ellipsoid concentration factor, a measure of ellipsoid ability to concentrate light onto the outer segment, correlates positively with outer segment taper expressed as a ratio of characteristic lengths, where critical taper is the yardstick. Depending on a light-funneling property and the presence of focusing organelles such as oil droplets, cone outer segments can be reduced in size to various degrees. We conclude that outer segment taper is but one component of a miniaturization process that reduces metabolic costs while improving signal detection. Compromise solutions in the various retinas and retinal regions occur between ellipsoid size and acuity, on the one hand, and faster response time and reduced light sensitivity, on the other.

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Shafiev, Ruslan. "Neural networks and society's intellectual capital." Russian Journal of Management 8, no. 2 (September 23, 2020): 61–65. http://dx.doi.org/10.29039/2409-6024-2020-8-2-61-65.

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In the article deals with the formation of modern neural networks, the possibilities of their inclusion in various production and social chains. What part of intellectual capital are intellectual property, neural networks themselves? Factors affecting the scope of intellectual property rights in Russia are evaluated. This segment of the market will become the arena of competitive activity in the near future.

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Melin, Erik. "Digital straight lines in the Khalimsky plane." MATHEMATICA SCANDINAVICA 96, no. 1 (March 1, 2005): 49. http://dx.doi.org/10.7146/math.scand.a-14944.

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We consider the digital plane of integer points equipped with the Khalimsky topology. We suggest a digitization of straight lines such that the digitized image is homeomorphic to the Khalimsky line and a digitized line segment is a Khalimsky arc. It is demonstrated that a Khalimsky arc is the digitization of a straight line segment if and only if it satisfies a generalized version of the chord property introduced by Rosenfeld.

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Landschulz, WH, PF Johnson, and SL McKnight. "The leucine zipper: a hypothetical structure common to a new class of DNA binding proteins." Science 240, no. 4860 (June 24, 1988): 1759–64. http://dx.doi.org/10.1126/science.3289117.

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A 30-amino-acid segment of C/EBP, a newly discovered enhancer binding protein, shares notable sequence similarity with a segment of the cellular Myc transforming protein. Display of these respective amino acid sequences on an idealized alpha helix revealed a periodic repetition of leucine residues at every seventh position over a distance covering eight helical turns. The periodic array of at least four leucines was also noted in the sequences of the Fos and Jun transforming proteins, as well as that of the yeast gene regulatory protein, GCN4. The polypeptide segments containing these periodic arrays of leucine residues are proposed to exist in an alpha-helical conformation, and the leucine side chains extending from one alpha helix interdigitate with those displayed from a similar alpha helix of a second polypeptide, facilitating dimerization. This hypothetical structure is referred to as the "leucine zipper," and it may represent a characteristic property of a new category of DNA binding proteins.

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43

O'Halloran, T. J., S. Ravid, and J. A. Spudich. "Expression of Dictyostelium myosin tail segments in Escherichia coli: domains required for assembly and phosphorylation." Journal of Cell Biology 110, no. 1 (January 1, 1990): 63–70. http://dx.doi.org/10.1083/jcb.110.1.63.

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The assembly of myosins into filaments is a property common to all conventional myosins. The ability of myosins to form filaments is conferred by the tail of the large asymmetric molecule. We are studying cloned portions of the Dictyostelium myosin gene expressed in Escherichia coli to investigate functional properties of defined segments of the myosin tail. We have focused on five segments derived from the 68-kD carboxyl-terminus of the myosin tail. These have been expressed and purified to homogeneity from E. coli, and thus the boundaries of each segment within the myosin gene and protein sequence are known. We identified an internal 34-kD segment of the tail, N-LMM-34, which is required and sufficient for assembly. This 287-amino acid domain represents the smallest tail segment purified from any myosin that is capable of forming highly ordered paracrystals characteristic of myosin. Because the assembly of Dictyostelium myosin can be regulated by phosphorylation of the heavy chain, we have studied the in vitro phosphorylation of the expressed tail segments. We have determined which segments are phosphorylated to a high level by a Dictyostelium myosin heavy chain kinase purified from developed cells. While LMM-68, the 68-kD carboxyl terminus of Dictyostelium myosin, or LMM-58, which lacks the 10-kD carboxyl terminus of LMM-68, are phosphorylated to the same extent as purified myosin, subdomains of these segments do not serve as efficient substrates for the kinase. Thus LMM-58 is one minimal substrate for efficient phosphorylation by the myosin heavy chain kinase purified from developed cells. Taken together these results identify two functional domains in Dictyostelium myosin: a 34-kD assembly domain bounded by amino acids 1533-1819 within the myosin sequence and a larger 58-kD phosphorylation domain bounded by amino acids 1533-2034 within the myosin sequence.

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Stanford, John L., Richard H. Still, and Arthur N. Wilkinson. "Effects of soft-segment prepolymer functionality on structure–property relations in RIM copolyurethanes." Polymer 44, no. 14 (June 2003): 3985–94. http://dx.doi.org/10.1016/s0032-3861(03)00357-4.

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Taheri, Shahed, and Gity Mir Mohamad Sadeghi. "Microstructure–property relationships of organo-montmorillonite/polyurethane nanocomposites: Influence of hard segment content." Applied Clay Science 114 (September 2015): 430–39. http://dx.doi.org/10.1016/j.clay.2015.06.036.

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46

Li, Hong Jiang, Da Yi Lu, and Qi Feng Wang. "Analysis on Stiff Frame in Replacement of Closure Segment for Prestressed Concrete Cable-Stayed Bridges." Applied Mechanics and Materials 351-352 (August 2013): 1423–31. http://dx.doi.org/10.4028/www.scientific.net/amm.351-352.1423.

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Stiff frame was the important structural member in construction of replacement of closure segment for prestressed concrete cable-stayed bridges. To establish the design calculation method of it and reveal its variation of internal forces with construction stages of replacement, some configurations and its working process of stiff frame was introduced. Based on construction stage analysis of replacement, calculation methods of its strength and stability were given. Through FEM results, influence of stiff frame to structural dynamic property and global stability of whole bridge were described. Analysis results showed, it was appropriate to consider each section steel of stiff frame as eccentric compression member. During construction, the transversal global property of stiff frame and the security of its link with main girder must be valued. Construction results also proved, the theoretical calculation method could reflect the actual structural state of stiff frame, and its result was conservative. Analysis on stiff frame was an important part of replacement of closure segment, and could provide ways and references for construction control of replacement of closure segment.

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Li, Ning, Fanglei Zeng, Yu Wang, Dezhi Qu, Wenbo Hu, Yigang Luan, Shuai Dong, Jianjun Zhang, and Yongping Bai. "Fluorinated polyurethane based on liquid fluorine elastomer (LFH) synthesis via two-step method: the critical value of thermal resistance and mechanical properties." RSC Advances 7, no. 49 (2017): 30970–78. http://dx.doi.org/10.1039/c7ra04509c.

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48

Zhang, Hong, Qian Qian Wang, Heng Xue Xiang, and Xiao Lei Wang. "Study on Polyethylene Glycol Acrylate Crosslinked Gels as Phase Change Materials." Advanced Materials Research 299-300 (July 2011): 649–53. http://dx.doi.org/10.4028/www.scientific.net/amr.299-300.649.

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The cross-linking degree of polyethylene glycol acrylate (PEGA) gel by free-radical solution polymerization was investigated in which PEGA was prepared by chemical modification. The structural morphology, crystal property, thermal property and thermostability were investigated using scanning electron microscope (SEM), polarization microscope (POM), differential scanning calorimeter (DSC), and thermogravimetric analysis (TG), respectively. The results showed that the chain segment of PEG had good activity in lightly cross-linked PEGA gel, the crystallization enthalpy of PEGA gel achieved to 122 J/g, and the duration of its soaking time was about 490 s. Furthermore, chain segment of PEG were bound in PEGA gel, but the crystallization enthalpy of PEGA gel achieved to 64.60 J/g, its soaking time was continued for about 430 s. PEGA gel had a better thermal stability below 300 °C.

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O'Sickey, Matthew J., Bruce D. Lawrey, and Garth L. Wilkes. "Structure-property relationships of poly(urethane urea)s with ultra-low monol content poly(propylene glycol) soft segments. I. Influence of soft segment molecular weight and hard segment content." Journal of Applied Polymer Science 84, no. 2 (February 15, 2002): 229–43. http://dx.doi.org/10.1002/app.10168.

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50

Ghosh, I., S. K. Sarangi, and P. K. Das. "Simulation Algorithm for Multistream Plate Fin Heat Exchangers Including Axial Conduction, Heat Leakage, and Variable Fluid Property." Journal of Heat Transfer 129, no. 7 (December 27, 2006): 884–93. http://dx.doi.org/10.1115/1.2717938.

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The effect of axial conduction through heat exchanger matrix, heat exchange with the surroundings, and variable fluid properties are included in the simulation algorithm of multistream plate fin heat exchangers. The procedure involves partitioning of the exchanger in both axial and normal directions, writing conservation equations for each segment, and solving them using an iterative procedure. In the normal direction, the exchanger is divided into a stack of overlapping two-stream exchangers interacting through their common streams. In the axial direction, the exchanger is successively partitioned to 2k segments, the final value of k being determined by the point where further partitioning has only marginal effect. The effects of axial conduction, heat leakage, and variable fluid properties are illustrated with the help of multistream heat exchanger examples solved by the above-mentioned technique.

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