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Zeitschriftenartikel zum Thema „O expander“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 9. Februar 2022

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1

Durgun, Mustafa, und Ersin Aksam. „Choosing the right rectangular expander and maximising the benefits from expanded tissue“. Journal of Wound Care 28, Nr. 6 (02.06.2019): 416–22. http://dx.doi.org/10.12968/jowc.2019.28.6.416.

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Objective: Tissue expanders are widely used in the reconstruction of tissue wounds. This study aims to demonstrate how to choose the correct size of rectangular expander in relation to wound size and the maximum advancement technique for wound coverage in order to achieve a successful outcome. Methods: The present study included patients who were operated on between January 2013 and January 2017. The expander height chosen was more than half the length of the wound and the expander width was chosen to be as wide as possible, based on the width of the wound. The expander was placed in a site adjacent to the wound. Maximum advancement method was used to achieve coverage of the wound. Results: A total of 19 patients were included in the study, mean age 17.5 (range: 11–25) years. Indication included burn scar (n=14) and congenital nevus (n=5). The tissue expander was inserted into the scalp in 17 patients and supraclavicular area in two patients. A successful wound repair was achieved with the planned flaps in all patients. Conclusion: In expansion using rectangular expanders, the required expanded skin is gained through the height of the expanded tissue. Thus, expander size should be preoperatively planned to ensure the height of expanded tissue would be, at least, half of the wound length. Maximum benefit will be achieved from the expanded tissue through the correct placement of expanded tissue lateral flaps.

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Nahas, Fábio Xerfan, Luis O. Vasconez und Lydia Masako Ferreira. „Guinea pigs as experimental model to evaluate the resistance of the tissue expander capsule“. Acta Cirurgica Brasileira 19, suppl 1 (Dezember 2004): 96–103. http://dx.doi.org/10.1590/s0102-86502004000700016.

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The purpose of this study is to report the use of guinea pigs as experimental model to study the resitance of the tissue expander capsule. Two groups were studied. In both groups a round 20 cc tissue expander, attached to a multiperforated catheter was inserted. The pocket housing was standardized. The skin over the expanded area was tattooed demarcating the area and arc, which were measured before and after each expansion. Every 4 days, a volume corresponding to 10% of the expander's total capacity was injected. Animals of the control group received 3 cc of saline through the catheter at the same time of expansion. Animals of the experimental group received 3 cc of the HBGF-1 diluted with saline. The intraluminal pressure of the expander was measured before and after the injection. After its total filling, the animals were sacrificed and 5 cc more were injected into each expander. The pressure was measured after each 1 cc injected. The capsule was examined histologically by immunofluorescence, trichrome and hematoxylin-eosin stains with the purpose of quantifying collagen and fibroblasts. The experimental model to study the resistance of the tissue expander's capsule showed to be feasible in guinea pigs.

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Harrow, A. W. „Quantum expanders from any classical Cayley graph expander“. Quantum Information and Computation 8, Nr. 8&9 (September 2008): 715–21. http://dx.doi.org/10.26421/qic8.8-9-2.

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We give a simple recipe for translating walks on Cayley graphs of a group G into a quantum operation on any irrep of G. Most properties of the classical walk carry over to the quantum operation: degree becomes the number of Kraus operators, the spectral gap becomes the gap of the quantum operation (viewed as a linear map on density matrices), and the quantum operation is efficient whenever the classical walk and the quantum Fourier transform on G are efficient. This means that using classical constant-degree constant-gap families of Cayley expander graphs on e.g. the symmetric group, we can construct efficient families of quantum expanders.

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Panesar, Angad S., und Marco Bernagozzi. „Two-Phase Expander Approach for Next Generation of Heat Recovery Systems“. International Journal of Renewable Energy Development 8, Nr. 3 (25.10.2019): 203–13. http://dx.doi.org/10.14710/ijred.8.3.203-213.

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This study presents the numerical adaptations to the semi-empirical expander model in order to examine the feasibility of piston expanders under off-design and two-phase scenarios. This expander model considers supply valve pressure drop, condensation phenomena, heat losses, leakage losses and friction losses. Using Aspen HYSYS©, the expander model is utilised in simulating the next generation of integrated engine cooling and exhaust heat recovery system for future heavy-duty engines. The heat recovery system utilises water-propanol working fluid mixture and consists of independent high pressure (HP) and low pressure (LP) expander. The results of off‑design and two-phase operation are presented in terms of expander efficiency and the different sources of loss, under two distinctive engine speed-load conditions. The heat recovery system, operating with the LP expander at two-phase and the HP expander at superheated condition, represented the design point condition. At the design point, the system provided 15.9 kW of net power, with an overall conversion efficiency of 11.4%, representing 10% of additional engine crankshaft power. At the extreme off-design condition, the two-phase expander operation improved the system performance as a result of the nullification of leakage losses due to the much denser working fluid. The optimised two-phase operation of the LP expander (x=0.55) and the HP expander (x=0.9) at the extreme-off design condition improved the system power by nearly 50% (17.4 vs. 11.7 kW) compared to the reference state. Finally, adapting piston air motors as two-phase expanders for experimental evaluation and reduction in frictional losses was a recommended research direction. ©2019. CBIORE-IJRED. All rights reserved

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Ali Salim, Kholoud Mohamed, Aminah Abd Jalil, Zamri Radzi, Siti Mazlipah Ismail, Jan T. Czernuszka und Mohammad Tariqur Rahman. „Inflammatory Responses in Oro-Maxillofacial Region Expanded Using Anisotropic Hydrogel Tissue Expander“. Materials 13, Nr. 19 (06.10.2020): 4436. http://dx.doi.org/10.3390/ma13194436.

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Objective: Reconstruction of oral and facial defects often necessitate replacement of missing soft tissue. The purpose of tissue expanders is to grow healthy supplementary tissue under a controlled force. This study investigates the inflammatory responses associated with the force generated from the use of anisotropic hydrogel tissue expanders. Methods: Sprague Dawley rats (n = 7, body weight = 300 g ± 50 g) were grouped randomly into two groups—control (n = 3) and expanded (n = 4). Anisotropic hydrogel tissue expanders were inserted into the frontal maxillofacial region of the rats in the expanded group. The rats were sacrificed, and skin samples were harvested, fixed in formalin, and embedded in paraffin wax for histological investigation. Hematoxylin and eosin staining was performed to detect histological changes between the two groups and to investigate the inflammatory response in the expanded samples. Three inflammatory markers, namely interleukin (IL)-1α, IL-6, and tumor necrosis factor-α (TNF-α), were analyzed by immunohistochemistry. Result: IL-1-α expression was only observed in the expanded tissue samples compared to the controls. In contrast, there was no significant difference in IL-6, and TNF-α production. Histological analysis showed the absence of inflammatory response in expanded tissues, and a negative non-significant correlation (Spearman’s correlation coefficient) between IL-1-α immune-positive cells and the inflammatory cells (r = −0.500). In conclusion, tissues that are expanded and stabilized using an anisotropic self-inflating hydrogel tissue expander might be useful for tissue replacement and engraftment as the expanded tissue does not show any sign of inflammatory responses. Detection of IL-1-α in the expanded tissues warrants further investigation for its involvement without any visible inflammatory response.

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Ke, G., und T. Hashimoto. „Viscous expander“. Cryogenics 34, Nr. 1 (Januar 1994): 9–18. http://dx.doi.org/10.1016/0011-2275(94)90046-9.

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7

Huang, Junying, Xiangying Shen, Chaoran Jiang, Zuhui Wu und Jiping Huang. „Thermal expander“. Physica B: Condensed Matter 518 (August 2017): 56–60. http://dx.doi.org/10.1016/j.physb.2017.05.022.

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8

Sipser, M., und D. A. Spielman. „Expander codes“. IEEE Transactions on Information Theory 42, Nr. 6 (1996): 1710–22. http://dx.doi.org/10.1109/18.556667.

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9

Shankar, Priti. „Expander codes“. Resonance 10, Nr. 1 (Januar 2005): 25–40. http://dx.doi.org/10.1007/bf02835890.

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10

Babacan, Hasan. „Diversified rapid maxillary expander or utility maxillary expander?“ American Journal of Orthodontics and Dentofacial Orthopedics 148, Nr. 4 (Oktober 2015): 529. http://dx.doi.org/10.1016/j.ajodo.2015.07.019.

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Fermoselli, N. E. G. „PREDICTING THE IMPACT OF A FCC TURBO EXPANDER ON PETROLEUM REFINERIES“. Revista de Engenharia Térmica 9, Nr. 1-2 (31.12.2010): 40. http://dx.doi.org/10.5380/reterm.v9i1-2.61929.

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Implementing a turbo expander connected to a fluid catalytic cracking (FCC) unit in order to produce power from flue gas has already become a common practice in oil refineries worldwide. Despite of recovering energy which used to be wasted in an orifice chamber, the implementation of expander and its skids still requires high investment, which often begins with a third-stage cyclones installation to enhance flue gas cleanness. Moreover, machine and also pipes need to be made with special materials in order to resist high temperatures and erosion. Hence, there are some items to be checked before start up a turbo expander to ensure the return on investment will reach expectations, keeping in mind that its ability to extract energy from flue gas changes widely depending on FCC operational conditions. Then, the aim of this paper is to provide the analysis of one stage turbo expander which is fed with flue gas from partial combustion FCC unit and installed with isolation valves, highlighting some points which deserve special attention before start up this type of machine. It brings together some approaches to provide valuable information about a turbo expander, particularly when it is not running yet, including the results to a hypothetical case and the sequence of calculus that can be done without using any special software applied for: • To estimate real energy generation through the turbo expander as a function of FCC feed; • To check the leaks effect; • To predict the impact of turbo expander on carbon monoxide boiler, due to a fall in temperature of the expanded flue gas; • To calculate the appropriate amount of extra supplementary gas required to be burned in the flue gas boiler in order to keep the production of steam stable; • To analyze the moisture of the flue gas so that it may predicts condensation when hot gas comes into contact with the cold duct, after opening isolation valves; • And finally, how turbo expanders fit in cleaning development mechanism to get certified carbon credits.

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Amann, C. A. „Comparing Expanders for Direct Recovery of Exhaust Energy From a Low-Heat-Rejection Diesel“. Journal of Engineering for Gas Turbines and Power 109, Nr. 4 (01.10.1987): 396–401. http://dx.doi.org/10.1115/1.3240054.

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Part-load performance of a compound low-heat-rejection (LHR) engine is estimated at constant speed. The engine consists of an LHR diesel reciprocator geared to a supercharging compressor and an exhaust expander. Two classes of expander differing substantially in both flow characteristics and energy-extraction principles are ranked: aerodynamic (reaction turbine) and positive-displacement (internal expansion). To focus the comparison on differences in fundamental expander characteristics rather than differences in efficiency levels among specific samples of each type of expander, each is assigned an efficiency of 100 percent at its best-efficiency point. Although differences in fundamental characteristics between the expanders were sufficient to rank them on a performance basis, these differences were largely overshadowed by the magnitude of the indicated work developed in the reciprocator relative to the work developed by the expander.

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Polak, Monika, und Vasyl Ustimenko. „Algorithms for generation of Ramanujan graphs, other Expanders and related LDPC codes“. Annales Universitatis Mariae Curie-Sklodowska, sectio AI – Informatica 15, Nr. 2 (11.10.2015): 14. http://dx.doi.org/10.17951/ai.2015.15.2.14-21.

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Expander graphs are highly connected sparse finite graphs. The property of being an expander seems significant in many of these mathematical, computational and physical contexts. For practical applications it is very important to construct expander and Ramanujan graphs with given regularity and order. In general, constructions of the best expander graphs with a given regularity and order is no easy task. In this paper we present algorithms for generation of Ramanujan graphs and other expanders. We describe properties of obtained graphs in comparison to previously known results. We present a method to obtain a new examples of irregular LDPC codes based on described graphs and we briefly describe properties of this codes.

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Cabrales, Pedro, Amy G. Tsai und Marcos Intaglietta. „Microvascular pressure and functional capillary density in extreme hemodilution with low- and high-viscosity dextran and a low-viscosity Hb-based O2 carrier“. American Journal of Physiology-Heart and Circulatory Physiology 287, Nr. 1 (Juli 2004): H363—H373. http://dx.doi.org/10.1152/ajpheart.01039.2003.

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Blood losses are usually corrected initially by the restitution of volume with plasma expanders and subsequently by the restoration of oxygen-carrying capacity using either a blood transfusion or possibly, in the near future, oxygen-carrying plasma expanders. The present study was carried out to test the hypothesis that high-plasma viscosity hemodilution maintains perfused functional capillary density (FCD) by preserving capillary pressure. Microvascular pressure responses to extreme hemodilution with low- (LV) and high-viscosity (HV) plasma expanders and an exchange transfusion with a polymerized bovine cell-free Hb (PBH) solution were analyzed in the awake hamster window chamber model ( n = 26). Systemic hematocrit was reduced from 50% to 11%. PBH produced a greater mean arterial blood pressure than the nonoxygen carriers. FCD was higher after a HV plasma expander (70 ± 15%) vs. PBH (47 ± 12%). Microvascular pressure spanning the capillary network was higher after a HV plasma expander (16–19 mmHg) compared with PBH (12–16 mmHg) and a LV plasma expander (11–14 mmHg) but lower than control (22–26 mmHg). FCD was found to be directly proportional to capillary pressure. The use of a HV plasma expander in extreme hemodilution maintained the number of perfused capillaries and tissue perfusion by comparison with a LV plasma expander due to increased mean arterial blood pressure and capillary pressure. The use of PBH increased mean arterial pressure but reduced capillary pressure due to vasoconstriction and did not maintain FCD.

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Zemor, G. „On expander codes“. IEEE Transactions on Information Theory 47, Nr. 2 (2001): 835–37. http://dx.doi.org/10.1109/18.910593.

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Katti, C. G., G. Katti, R. Kallur und S. R. Ghali. „Magical NiTi expander“. Case Reports 2013, jul17 1 (17.07.2013): bcr2013009140. http://dx.doi.org/10.1136/bcr-2013-009140.

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17

Mendoza-Smith, Rodrigo, und Jared Tanner. „Expander ℓ0-decoding“. Applied and Computational Harmonic Analysis 45, Nr. 3 (November 2018): 642–67. http://dx.doi.org/10.1016/j.acha.2017.03.001.

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18

Treiser, Matthew D., Tracy Lahair und Matthew J. Carty. „Tissue Expander Overfilling“. Plastic and Reconstructive Surgery - Global Open 4, Nr. 2 (Februar 2016): e612. http://dx.doi.org/10.1097/gox.0000000000000594.

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19

Clemow, Richard David, und Alastair Sibbald. „Stereo sound expander“. Journal of the Acoustical Society of America 115, Nr. 3 (2004): 952. http://dx.doi.org/10.1121/1.1697741.

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Kamber, Amitay. „Lp-Expander Graphs“. Israel Journal of Mathematics 234, Nr. 2 (Oktober 2019): 863–905. http://dx.doi.org/10.1007/s11856-019-1938-7.

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Mason, A. Corde, Steven P. Davison und Ernest K. Manders. „Tissue Expander Infections in Children: Look Beyond the Expander Pocket“. Annals of Plastic Surgery 43, Nr. 5 (November 1999): 539–41. http://dx.doi.org/10.1097/00000637-199911000-00013.

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22

Wang, Wei, Yu Ting Wu, Chong Fang Ma und Jian Yu. „Efficiency Analysis on Low Temperature Energy Conversion System Based on Organic Rankine Cycle“. Advanced Materials Research 347-353 (Oktober 2011): 498–503. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.498.

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The amount of low temperature heat resources is very huge, efficient utilization that energy is very important issue for improving energy efficiency, saving energy and protecting environment. Due to the small available energy of low temperature heat source, how to improve thermodynamic efficiency is the key problem. In this paper, the thermodynamic model of low temperature thermal power conversion system based on organic Rankine cycle was described firstly. Turbine, single screw and piston expanders were briefly described. R123, R245fa and R134a were chose as working fluid because of quite different critical temperature. Based on this model, the influence of thermodynamic property of organic working fluid on the efficiency of low temperature thermal power conversion system was discussed. The calculating result showed that R123 is the best choice if no considering the impact of expander types and that R245fa is the best choice if considering the impact of expander. This conclusion indicated that it is very important to investigate the match relationship between working fluid and expander. Moreover, single screw expander was proved to be more suitable than turbine and piston expanders for low temperature heat power conversion system.

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Kolasiński. „Application of the Multi-Vane Expanders in ORC Systems—A Review on the Experimental and Modeling Research Activities“. Energies 12, Nr. 15 (01.08.2019): 2975. http://dx.doi.org/10.3390/en12152975.

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This paper reviews the applications of the multi-vane expanders in ORC (organic Rankine cycle) systems. The operating principle and design of the ORC systems are addressed in the introduction. Then, there is a brief review of the expanders applied in small-power and micro-power ORCs, and a discussion of the multi-vane expander design and operating principle as an introduction to a comprehensive review on the applications of the multi-vane expanders in ORC systems. The different features of the multi-vane expanders—i.e., the design of the expander, its geometrical dimensions and operating conditions, durability, applied working fluid, obtained power output, and efficiency—are analyzed in this paper. This review clearly indicates that multi-vane expanders are a promising alternative to the different types of the expanders applied in ORC systems.

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Gross, D., und J. Eisert. „Quantum margulis expanders“. Quantum Information and Computation 8, Nr. 8&9 (September 2008): 722–33. http://dx.doi.org/10.26421/qic8.8-9-3.

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We present a simple way to quantize the well-known Margulis expander map. The result is a quantum expander which acts on discrete Wigner functions in the same way the classical Margulis expander acts on probability distributions. The quantum version shares all essential properties of the classical counterpart, e.g., it has the same degree and spectrum. Unlike previous constructions of quantum expanders, our method does not rely on non-Abelian harmonic analysis. Analogues for continuous variable systems are mentioned. Indeed, the construction seems one of the few instances where applications based on discrete and continuous phase space methods can be developed in complete analogy.

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Yun, Eunkoo, Dokyun Kim, Minseog Lee, Seungdong Baek, Sang Youl Yoon und Kyung Chun Kim. „Parallel-expander Organic Rankine cycle using dual expanders with different capacities“. Energy 113 (Oktober 2016): 204–14. http://dx.doi.org/10.1016/j.energy.2016.07.045.

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Agrawal, Neeraj K., Aditya N. Choudhary und Preeti Agrawal. „Tissue expansion as an aesthetic alternative for facial resurfacing: a single centre series of 92 patients“. International Journal of Research in Medical Sciences 7, Nr. 12 (27.11.2019): 4484. http://dx.doi.org/10.18203/2320-6012.ijrms20195505.

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Background: The visibility, vulnerability and social stigmata of facial scars whether by burn, nevi or trauma can be compelling for the patient as well as challenging for the surgeon. Restoration to normal form and aesthetics require tissue replacement which has good colour and texture match and produce minimal visible scarring. Although many other options are available for a given defect, tissue expansion offers the best alternative which meets almost all the criteria of an ideal procedure.Methods: Among 92 patients with deformities over various facial subunits were operated and expanders 50 ml to 300 ml inserted subcutaneously adjacent to the scar. Prior planning, accurate measurement and choice of ideal expander is extremely important. A precise and practical method of calculation for determination of amount and duration of expander was used. Any secondary deformity to adjoining vital structures was avoided.Results: Results were meticulously and critically analyzed. Different shapes, dimensions and volume of expanders were used depending on the anatomical site which was to be expanded. A total of 118 expanders were inserted in 92 patients. The average volume of tissue expanders used was 170.33 ml. Majority of the expanders used had volume of 200 ml (62.71%). Post-expansion volume was 240.67 ml and the over expansion done was 41.3% over the pre-expansion volume of 170.33 ml. Surgical outcome and cosmesis was assessed by the patient’s perspective and was considered fair by 57.61% patients.Conclusions: The study underlines the clinical application, reasons for overexpansion as well as shortcomings and complications of tissue expansion.

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CZUMAJ, ARTUR, und CHRISTIAN SOHLER. „Testing Expansion in Bounded-Degree Graphs“. Combinatorics, Probability and Computing 19, Nr. 5-6 (09.06.2010): 693–709. http://dx.doi.org/10.1017/s096354831000012x.

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We consider the problem of testing expansion in bounded-degree graphs. We focus on the notion of vertex expansion: an α-expander is a graph G = (V, E) in which every subset U ⊆ V of at most |V|/2 vertices has a neighbourhood of size at least α ⋅ |U|. Our main result is that one can distinguish good expanders from graphs that are far from being weak expanders in time $\widetilde{\O}(\sqrt{n})$. We prove that the property-testing algorithm proposed by Goldreich and Ron with appropriately set parameters accepts every α-expander with probability at least $\frac23$ and rejects every graph that is ϵ-far from any α*-expander with probability at least $\frac23$, where $\expand^* \,{=}\, \Theta(\frac{\expand^2}{d^2 \log(n/\epsilon)})$ and d is the maximum degree of the graphs. The algorithm assumes the bounded-degree graphs model with adjacency list graph representation and its running time is $\O(\frac{d^2 \sqrt{n} \log(n/\epsilon)} {\expand^2 \epsilon^3})$.

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Cunha, Marcelo Sacramento, Hugo Alberto Nakamoto, Marisa Roma Herson, José Carlos Faes, Rolf Gemperli und Marcus Castro Ferreira. „Tissue expander complications in plastic surgery: a 10-year experience“. Revista do Hospital das Clínicas 57, Nr. 3 (Juni 2002): 93–97. http://dx.doi.org/10.1590/s0041-87812002000300002.

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INTRODUCTION: Tissue expanders have been of great value in plastic surgery. Tissue expansion was developed for a specific indication; however, within a very short time, the concept of tissue expansion found wide applicability. From 1990 to 1999, 315 expanders in 164 patients were utilized. A retrospective analysis of complications and prognostic factors for complications were done. METHODS: The indications for tissue expansion were burns (50%), trauma (32%), and sequelae of previous surgery (8.8%). The expanders were inserted most frequently in the scalp, trunk and neck. RESULTS: There were 22.2% of complications and the most common were expander exposure (50%), infection (24%) and bad function of the expander (12.8%). The present study revealed an increased rate of minor complications in the group of 0 to 10 years of age and an increased rate of major complications for face and neck expansions compared to trunk expansion. There were no increased complication rates for the other age and anatomic site groups, previous expansion, concomitant expansion and type of expander used. CONCLUSIONS: The outcomes from tissue expansion procedures done in our hospital are similar to those reported in the literature. Tissue expansion is a good and safe technique.

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Hastings, M. B., und A. W. Harrow. „Classical and quantum tensor product expanders“. Quantum Information and Computation 9, Nr. 3&4 (März 2009): 336–60. http://dx.doi.org/10.26421/qic9.3-4-9.

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We introduce the concept of quantum tensor product expanders. These generalize the concept of quantum expanders, which are quantum maps that are efficient randomizers and use only a small number of Kraus operators. Quantum tensor product expanders act on several copies of a given system, where the Kraus operators are tensor products of the Kraus operator on a single system. We begin with the classical case, and show that a classical two-copy expander can be used to produce a quantum expander. We then discuss the quantum case and give applications to the Solovay-Kitaev problem. We give probabilistic constructions in both classical and quantum cases, giving tight bounds on the expectation value of the largest nontrivial eigenvalue in the quantum case.

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de Araújo, Marília Carolina, Jessica Rico Bocato, Sandrine Bittencourt Berger, Paula Vanessa Pedron Oltramari, Ana Cláudia de Castro Ferreira Conti, Marcio Rodrigues de Almeida und Thais Maria Freire Fernandes. „Perceived pain during rapid maxillary expansion in children with different expanders:“. Angle Orthodontist 91, Nr. 4 (23.02.2021): 484–89. http://dx.doi.org/10.2319/092820-829.1.

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ABSTRACT Objectives To evaluate and compare the intensity of pain caused by rapid maxillary expansion (RME) with two expanders: Hyrax and Haas type, in growing patients. Materials and Methods Thirty-nine patients (23 girls and 16 boys) with an average age of 9.3 years (SD = 1.39 years) were randomized into two groups and treated with Hyrax- and Haas-type expanders. In both groups, initial activation of the expander screw was one full turn on the first day followed by 2/4 of a turn two times a day (morning and night) for 7 days. Inclusion criteria were patients presenting with a posterior crossbite or maxillary atresia between 7 and 12 years old. To evaluate the intensity of pain during the active phase of the treatment, a combination of the Numerical Rating Scale and Wong-Baker Faces Pain Scale was used. Mann-Whitney test was used to compare the two treatment groups. Results There was significant inverse correlation between days following insertion and pain. During the expansion period, 100% of the children reported some pain. Hyrax expander subjects reported greater pain than those treated with the Haas-type expander only on the first day. The level of pain remained greater in girls throughout treatment. Conclusions Pain was reported regardless of the type of expander and was higher in the Hyrax group only on the first day of activation.

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Moon, Hyung-Wook, Min-Jung Kim, Hyo-Won Ahn, Su-Jung Kim, Seong-Hun Kim, Kyu-Rhim Chung und Gerald Nelson. „Molar Inclination and Surrounding Alveolar Bone Change Relative To the Design of Bone-borne Maxillary Expanders: A Cbct study“. Angle Orthodontist 90, Nr. 1 (28.08.2019): 13–22. http://dx.doi.org/10.2319/050619-316.1.

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ABSTRACT Objective To evaluate the molar inclination and skeletal and alveolar bone changes when comparing tooth bone-borne (MSE) and tissue bone-borne type maxillary expanders (C-expander) using cone-beam computed tomography (CBCT) in late adolescence. Materials and Methods A sample of 48 late-adolescent patients were divided into two groups according to the type of expander: MSE group (n = 24, age = 19.2 ± 5.9 years) and C-expander group (n = 24, age = 18.1 ± 4.5 years). CBCT scans were taken before treatment and 3 months after expansion. Transverse skeletal and dental expansion, alveolar inclination, tooth axis, buccal alveolar bone height, thickness, dehiscence, and fenestration were evaluated on the maxillary first molar. Paired t-test, independent t-test, Pearson's chi-square test, and Spearman correlation analysis were performed. Results The MSE group produced greater dental expansion (P < .05), whereas skeletal expansion was similar in both groups (P = .859). The C expander group had more alveolar bone inclination change (P < .01), and the MSE group had more buccal tipping of the anchorage teeth (P < .01 or .001). Buccal alveolar bone height loss and thickness changes were greater in the MSE group (P < .01 or <.001). Formation of dehiscences was more frequent in the MSE group (P < .001), whereas for fenestrations, there were no significant differences between the two groups. Buccal bone height loss in the MSE group had a negative correlation with initial buccal bone thickness. Conclusions The incorporation of teeth into bone-borne expanders resulted in an increase in the severity of side effects. For patients in late adolescence, tissue bone-borne expanders offer comparable skeletal effects to tooth bone-borne expanders, with fewer dentoalveolar side effects.

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Singh, Simarpreet, und M. S. Dasgupta. „Evaluating Applicability of a Scroll Expander for CO2 Refrigeration System at Warm Climate“. International Journal of Air-Conditioning and Refrigeration 25, Nr. 02 (21.03.2017): 1750012. http://dx.doi.org/10.1142/s2010132517500122.

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Performance of a trans-critical CO2 refrigeration cycle equipped with a scroll work recovery expander is investigated using a semi-empirical model of the scroll, for high ambient temperature application. Maximum isentropic efficiency of 61% is obtained, for a pressure ratio of about 3.7 for the scroll expander. Simulation results obtained are further validated against the reported experimental results. It is also observed that, about 20% of the total energy consumed can be recovered with the help of scroll expander during trans-critical operation. Based on year-round ambient temperature data, at New Delhi (India), an economic analysis is carried out for installation of work recovery scroll system. Total payback period (PBP) for scroll expanders of various capacities are also determined. It is noted that the PBP of scroll expander is about 1 to 2 years or less, which is encouraging. Total Equivalent Warming Impact (TEWI) of the system is compared with that of a conventional trans-critical CO2 refrigeration system and system running on low global warming potential (GWP) hydrofluoroolefin (R1234yf) refrigerant. Trans-critical CO2 system along with work recovery scroll expander appears justified as the same has about 15% lower TEWI compared to conventional trans-critical CO2 system but is 50% more than R1234yf system.

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HAGLIN, DAVID J. „BIPARTITE EXPANDER MATCHING IS IN NC“. Parallel Processing Letters 05, Nr. 03 (September 1995): 413–20. http://dx.doi.org/10.1142/s0129626495000382.

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A work-efficient deterministic [Formula: see text] algorithm is presented for finding a maximum matching in a bipartite expander graph with any expansion factor β > 1. This improves upon a recently presented deterministic [Formula: see text] maximum matching algorithm which is restricted to those bipartite expanders with large expansion factors (β ≥ Δ∊, ∊ > 0), and is not work-efficient [1].

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Yordanova, Svetlana. „TRIPLE ACTION PALATE EXPANDER“. Journal of IMAB - Annual Proceeding (Scientific Papers) 17, 2, Nr. 2011 (21.09.2011): 126–28. http://dx.doi.org/10.5272/jimab.2011172.126.

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35

Akmal, NurLiyanaHannahBintiIzham. „TISSUE EXPANDER – A REVIEW“. International Journal of Advanced Research 4, Nr. 6 (31.05.2016): 1683–93. http://dx.doi.org/10.21474/ijar01/610.

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36

Goje, Santosh Kumar. „Expander with differential opening“. American Journal of Orthodontics and Dentofacial Orthopedics 157, Nr. 6 (Juni 2020): 733. http://dx.doi.org/10.1016/j.ajodo.2020.03.003.

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Jelodar, Mehdi Taleshian, Hasan Rastegar und Hossein Askarian Abyaneh. „Modeling turbo-expander systems“. SIMULATION 89, Nr. 2 (15.01.2013): 234–48. http://dx.doi.org/10.1177/0037549712469661.

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Shively, Raymond E. „Skin-Expander Volume Estimator“. Plastic and Reconstructive Surgery 77, Nr. 3 (März 1986): 482–83. http://dx.doi.org/10.1097/00006534-198603000-00031.

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Shariv, I., Y. Amitai und A. A. Friesem. „Compact holographic beam expander“. Optics Letters 18, Nr. 15 (01.08.1993): 1268. http://dx.doi.org/10.1364/ol.18.001268.

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Hollins, Andrew, Lily R. Mundy, Andrew Atia, Heather Levites, Andrew Peterson und Detlev Erdmann. „Tissue Expander Scrotal Reconstruction“. Plastic and Reconstructive Surgery - Global Open 8, Nr. 3 (März 2020): e2714. http://dx.doi.org/10.1097/gox.0000000000002714.

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Elliott, Martin P., und Will Dubrul. „Magna-Site Tissue Expander“. Plastic and Reconstructive Surgery 81, Nr. 4 (April 1988): 605–7. http://dx.doi.org/10.1097/00006534-198804000-00022.

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42

Paek, Lawrence S., Jean Olivier Tétreault-Paquin, Samuel St-Jacques, Monica Nelea, Christina Bernier, Carlos Cordoba, Joseph Bou Merhi, Alain Gagnon und Alain Danino. „Breast Expander-Implant Capsules“. Plastic and Reconstructive Surgery 130 (November 2012): 38–39. http://dx.doi.org/10.1097/01.prs.0000421741.87330.a8.

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43

Schott, Wayne M. „High volume expander circuit“. Journal of the Acoustical Society of America 111, Nr. 5 (2002): 1968. http://dx.doi.org/10.1121/1.1486382.

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44

Buss, Sam, Valentine Kabanets, Antonina Kolokolova und Michal Koucký. „Expander construction in VNC1“. Annals of Pure and Applied Logic 171, Nr. 7 (Juli 2020): 102796. http://dx.doi.org/10.1016/j.apal.2020.102796.

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45

Roos, Martin. „... und wird zum Expander“. Im Focus Onkologie 16, Nr. 9 (September 2013): 10. http://dx.doi.org/10.1007/s15015-013-0550-7.

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46

Dutta, Neelav, und David Jensen. „Gonality of expander graphs“. Discrete Mathematics 341, Nr. 9 (September 2018): 2535–43. http://dx.doi.org/10.1016/j.disc.2018.06.012.

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47

Frieze, Alan M., und Michael Molloy. „Splitting an Expander Graph“. Journal of Algorithms 33, Nr. 1 (Oktober 1999): 166–72. http://dx.doi.org/10.1006/jagm.1999.1023.

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48

Angel, D., R. Mary Jeya Jothi, R. Revathi und A. Raja. „Expander Graphs – A Study“. Journal of Physics: Conference Series 1770, Nr. 1 (01.03.2021): 012078. http://dx.doi.org/10.1088/1742-6596/1770/1/012078.

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Alves, Arthur César de Medeiros, Guilherme Janson, James A. Mcnamara, José Roberto Pereira Lauris und Daniela Gamba Garib. „Maxillary expander with differential opening vs Hyrax expander: A randomized clinical trial“. American Journal of Orthodontics and Dentofacial Orthopedics 157, Nr. 1 (Januar 2020): 7–18. http://dx.doi.org/10.1016/j.ajodo.2019.07.010.

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50

Vella, Massimiliano, Paolo Cressoni, Cinzia Tripicchio, Eleonora Mainardi und Luca Esposito. „Early Treatment with a Slow Maxillary Ni–Ti Leaf Springs Expander“. Applied Sciences 11, Nr. 10 (17.05.2021): 4541. http://dx.doi.org/10.3390/app11104541.

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The aim of this brief report is to analyse the available literature on the clinical outcomes of a particular appliance for slow maxillary expansion that consists of one or more nickel–titanium springs. Materials and methods: The main medical databases (Scopus, Web of Sciences, Pubmed and Google Scholar) were scanned up to January 2020 using “slow maxillary expan*”, “slow palatal expan*”, “leaf expander” and “NiTi Palatal Expander” as keywords. Skeletal changes in the maxilla after expansion with the Leaf Expander (L.E.) or similar appliances were taken into consideration while reviewing relevant manuscripts. The review focuses on the comparison between the L.E. and conventional expanders (i.e., Haas and Hyrax) regarding the increase in both the distance between the palatal cusps of the upper first molars and the distance between the palatal cusps of the upper second deciduous molars, as well as the increment of nasal structures and pain connected to expansion procedures. Results: Bibliographic research retrieved 32 articles that were considered eligible for the present study. The limited number of articles currently available in international medical databases is allegedly partly due to the fact that these expanders are currently produced by only one patent holder company, which affects its diffusion. Conclusion: Despite the reduced number of published articles, due to the recent introduction of the L.E. device, most of the authors have found that the effects of the L.E. device are clinically and radiographically comparable to those achievable with the rapid palatal expander.

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