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Relevant bibliographies by topics / Dilation

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Academic literature on the topic 'Dilation'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 June 2025

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Journal articles on the topic "Dilation"

1

SKEIDE, MICHAEL. "ISOMETRIC DILATIONS OF REPRESENTATIONS OF PRODUCT SYSTEMS VIA COMMUTANTS." International Journal of Mathematics 19, no. 05 (2008): 521–39. http://dx.doi.org/10.1142/s0129167x08004790.

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We construct a weak dilation of a not necessarily unital CP-semigroup to an E-semigroup acting on the adjointable operators of a Hilbert module with a unit vector. We construct the dilation in such a way that the dilating E-semigroup has a pre-assigned product system. Then, making use of the commutant of von Neumann correspondences, we apply the dilation theorem to prove that covariant representations of product systems admit isometric dilations.

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Rocourt, Dorothy, and Travis Hoover. "MINIMAL INVASIVE MANAGEMENT OF PEDIATRIC CROHN’S ANORECTAL STRICTURE, LESS IS MORE." Inflammatory Bowel Diseases 27, Supplement_1 (2021): S16. http://dx.doi.org/10.1093/ibd/izaa347.039.

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Abstract Background Anorectal stricture (ARS) is an uncommon but potentially disabling manifestation of perianal Crohn disease (CD) in pediatric patients. Various treatment options are available but there is little data regarding their efficacy, particularly in the pediatric population. We present three case reports of patients with symptomatic ARS treated with serial dilation and biologic therapy. Methods An institutional review board-approved retrospective review was performed using electronic health records. Three patients with ileocolonic CD and perianal involvement with symptomatic ARS were identified. All patients were treated with serial rectal dilations under general anesthesia using Hegar dilators. Results All patients are currently asymptomatic at follow-ups ranging from 1 to 3.5 years since the last dilation. Patient demographics and details of ARS management are presented in Table 1. All patients tolerated the procedures well and did not experience complications such as perforation, sepsis, or fecal incontinence. Rectal biopsy in each patient showed active inflammation, suggesting type 1 stricture according to the Hughes-Cardiff Classification (vs. type 2 fibrotic stricture). Patient 1 experienced 6 recurrences, each managed with an average of 2 dilations until disease control was established with ustekinumab (USK) and eventually vedolizumab (VDZ). She underwent ileocecal resection three years after the final dilation. Patient 2 underwent ileocecal resection immediately following the first series of dilations. He later experienced one stricture recurrence at 2 years, which was managed with one dilation and increased USK dosing frequency. Patient 3 received steroid suppositories prior to dilation and has been self-dilating at home. He has had no recurrences requiring operative dilation. Self-dilation was not feasible in patients 1 and 2. Conclusion Inflammatory anorectal stricture associated with perianal Crohn disease in pediatric patients can be managed successfully with dilation until disease control with biologic therapy. Recurrences of stricture can also be managed with dilation and modification of biologic therapy. If tolerated, self-dilation may reduce recurrence. Background Anorectal stricture (ARS) is an uncommon but potentially disabling manifestation of perianal Crohn disease (CD) in pediatric patients. Various treatment options are available but there is little data regarding their efficacy, particularly in the pediatric population. We present three case reports of patients with symptomatic ARS treated with serial dilation and biologic therapy. Crohn’s rectal stricture pre and post dilation

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Cheng, Tsung O. "Dilation versus dilatation." American Journal of Cardiology 73, no. 5 (1994): 421. http://dx.doi.org/10.1016/0002-9149(94)90030-2.

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O’Dea, John, and Peter D. Siersema. "Esophageal dilation with integrated balloon imaging: initial evaluation in a porcine model." Therapeutic Advances in Gastroenterology 6, no. 2 (2012): 109–14. http://dx.doi.org/10.1177/1756283x12467566.

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Background: When treating achalasia, balloon dilation is often combined with fluoroscopy to allow the lower esophageal sphincter to be visualized as it is being dilated. We sought to evaluate a new balloon dilation technology, EsoFLIP, which allows the shape of the balloon to be visualized in a nonradiographic manner by using impedance planimetry electrodes located within the dilation balloon. Methods: Two pigs weighing 35 kg were used. The EsoFLIP balloon dilator was introduced under endoscopic visualization. Successive injections of 50, 60, 70 and 85 mL into the dilation balloon permitted dilations at increasing diameters to be achieved. Following each dilation fluid was withdrawn to leave 30 mL in the balloon and an EsoFLIP image was captured to track progressive dilation of the gastroesophageal junction (GEJ). Results: The EsoFLIP catheter was safely deployed in the two pigs and no complications were noted. For pig 1, during dilation, the measured balloon diameter at the waist was 24.1, 28.9, 29.2 and 30.0 mm for balloon dilation volumes of 50, 60, 70 and 85 mL respectively. For pig 2 the corresponding diameter at the waist was 22.8, 27.1, 28.5 and 29.4 mm. The GEJ diameter increased from 12.5 and 12.4 mm to 17.4 and 17.5mm for pigs 1 and 2 respectively. Distensibility of the GEJ in pig 1 increased from 2.3 mm2/mmHg before to 4.4 mm2/mmHg after dilation and in pig 2 from 4.4 to 9.6 mm2/mmHg. The GEJ substantively achieved its final diameter after the dilation using just 50 mL in the balloon. Conclusions: We demonstrated technical feasibility and safety of the EsoFLIP dilator in a porcine model. Further studies in humans with achalasia remain to be conducted, which, besides demonstrating technical feasibility, should also evaluate the use of distensibility measurements taken during dilation to predict outcomes.

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Cohen, Kenneth D., Bradley R. Berg, and Ingrid H. Sarelius. "Remote arteriolar dilations in response to muscle contraction under capillaries." American Journal of Physiology-Heart and Circulatory Physiology 278, no. 6 (2000): H1916—H1923. http://dx.doi.org/10.1152/ajpheart.2000.278.6.h1916.

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In hamster cremaster muscle, it has been shown previously that contraction of skeletal muscle fibers underlying small groups of capillaries (modules) induces dilations that are proportional to metabolic rate in the two arteriolar generations upstream of the stimulated capillaries (Berg BR, Cohen KD, and Sarelius IH. Am J Physiol Heart Circ Physiol 272: H2693–H2700, 1997). These remote dilations were hypothesized to be transmitted via gap junctions and not perivascular nerves. In the present study, halothane (0.07%) blocked dilation in the module inflow arteriole, and dilation in the second arteriolar generation upstream, the branch arteriole, was blocked by both 600 mosM sucrose and halothane but not tetrodotoxin (2 μM). Dilations in both arterioles were not blocked by the gap junction uncoupler 18-β-glycyrrhetinic acid (40 μM), and 80 mM KCl did not block dilation of the module inflow arteriole. These data implicate a gap junctional-mediated pathway insensitive to 18-β-glycyrrhetinic acid in dilating the two arterioles upstream of the capillary module during “remote” muscle contraction. Dilation in the branch arteriole, but not the module inflow arteriole, was attenuated by 100 μM N ω-nitro-l-arginine. Thus selective contraction of muscle fibers underneath capillaries results in dilations in the upstream arterioles that have characteristics consistent with a signal that is transmitted along the vessel wall through gap junctions, i.e., a conducted vasodilation. The observed insensitivities to 18-β-glycyrrhetinic acid, to KCl, and to N ω-nitro-l-arginine suggest, however, that there are multiple signaling pathways by which remote dilations can be initiated in these microvessels.

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Aschner, Judy L., Thuy K. Smith, Nora Kovacs, Joaquim M. B. Pinheiro, and Mamta Fuloria. "Mechanisms of bradykinin-mediated dilation in newborn piglet pulmonary conducting and resistance vessels." American Journal of Physiology-Lung Cellular and Molecular Physiology 283, no. 2 (2002): L373—L382. http://dx.doi.org/10.1152/ajplung.00032.2002.

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Bradykinin (BK) is a potent dilator of the perinatal pulmonary circulation. We investigated segmental differences in BK-induced dilation in newborn pig large conducting pulmonary artery and vein rings and in pressurized pulmonary resistance arteries (PRA). In conducting pulmonary arteries and veins, BK-induced relaxation is abolished by endothelial disruption and by inhibition of nitric oxide (NO) synthase with nitro-l-arginine (l-NA). In PRA, two-thirds of the dilation response isl-NA insensitive. Charybdotoxin plus apamin and depolarization with KCl abolish the l-NA-insensitive dilations, findings that implicate the release of endothelium-derived hyperpolarizing factor (EDHF). However, endothelium-disrupted PRA retain the ability to dilate to BK but not to ACh or A-23187. In endothelium-disrupted PRA, dilation was inhibited by charybdotoxin. Thus in PRA, BK elicits dilation by multiple and duplicative signaling pathways. Release of NO and EDHF contributes to the response in endothelium-intact PRA; in endothelium-disrupted PRA, dilation occurs by direct activation of vascular smooth muscle calcium-dependent potassium channels. Redundant signaling pathways mediating pulmonary dilation to BK may be required to assure a smooth transition to extrauterine life.

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Zhang, Kechen, Martin I. Sereno, and Margaret E. Sereno. "Emergence of Position-Independent Detectors of Sense of Rotation and Dilation with Hebbian Learning: An Analysis." Neural Computation 5, no. 4 (1993): 597–612. http://dx.doi.org/10.1162/neco.1993.5.4.597.

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We previously demonstrated that it is possible to learn position-independent responses to rotation and dilation by filtering rotations and dilations with different centers through an input layer with MT-like speed and direction tuning curves and connecting them to an MST-like layer with simple Hebbian synapses (Sereno and Sereno 1991). By analyzing an idealized version of the network with broader, sinusoidal direction-tuning and linear speed-tuning, we show analytically that a Hebb rule trained with arbitrary rotation, dilation/contraction, and translation velocity fields yields units with weight fields that are a rotation plus a dilation or contraction field, and whose responses to a rotating or dilating/contracting disk are exactly position independent. Differences between the performance of this idealized model and our original model (and real MST neurons) are discussed.

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Stoner, Patrick L., Amy L. Fullerton, Alyssa M. Freeman, Neil N. Chheda, and David S. Estores. "Endoscopic Dilation of Refractory Postlaryngectomy Strictures: A Case Series and Literature Review." Gastroenterology Research and Practice 2019 (May 28, 2019): 1–9. http://dx.doi.org/10.1155/2019/8905615.

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Background. Endoscopic dilation of postlaryngectomy strictures (PLS) is safe and effective; however, PLS are often refractory and require serial dilations. Long-term outcomes of dilation in patients with refractory PLS are not well reported. Materials and Methods. Seven patients with dysphagia and refractory PLS underwent serial endoscopic dilation therapy during a 4.5-year period. Dilation characteristics, technical success, clinical success, and diet advancement (as assessed by Diet/GT scale) were measured. Results. All strictures were complex, and there were no reported complications. The median number of dilations per patient was 12 (range 7 to 48). The average interval in between dilations was six weeks. Technical success was achieved in 6/7 patients, and clinical success was achieved in 2/7 patients. 6/7 patients had advancements in Diet/GT scores. Conclusions. Dilation of refractory PLS is safe and effective and frequently requires the use of a retrograde approach, fluoroscopic guidance, and/or lumen patency strings. Serial dilations are required to maintain luminal patency, relieve dysphagia, and advance oral diet. The definition of clinical success of dilation in these patients should avoid the use of a specific time interval between dilations to characterize success.

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Sullivan, Stephen N., Marie Corke, and William C. Watson. "Self Dilation of Esophageal Strictures." Canadian Journal of Gastroenterology 5, no. 2 (1991): 49–50. http://dx.doi.org/10.1155/1991/940150.

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Over 22 years, 26 patients were taught to dilate their esophageal strictures. Fifteen had peptic strictures, four malignant neoplasms, three achalasia, three dysphagia following fundoplication and one esophageal lichen planus. The patients with peptic strictures (mean age 58 years) did particularly well, repeatedly dilating themselves over an average of six years (range two months to 18 years). There were no serious complications. Self dilation is a safe, convenient and inexpensive way to manage patients who require repeated, frequent dilations for esophageal strictures.

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Phaijitwichian, Somboon. "One-shot dilation versus metallic dilation technique for access in percutaneous nephrolithotomy: comparison of efficacy, access time and fluoroscopic time." Insight Urology 42, no. 2 (2021): 154–59. http://dx.doi.org/10.52786/isu.a.38.

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Objective: The aim of this study was to compare the efficacy, access tract dilation time and fluoroscopic time between the one-shot dilation technique and telescopic metal dilatation technique in patients undergoing percutaneous nephrolithotomy in Nakornping Hospital. Materials and Methods: Sixty-six patients who underwent percutaneous nephrolithotomy from January 2020 to July 2021 were included in the study and they were randomly divided into two groups. In group 1 (32 patients), telescopic metal dilation was used, in group 2 (33 patients), the one-shot technique was used. Success rates of dilation, access tract dilation time and fluoroscopic time were evaluated. Results: The success rate of dilation was 100% in both groups. The access tract dilation time was 835.63 ± 309.68 seconds in group 1 and 569.42 ± 314.75 seconds in group 2 (p = 0.001). The fluoroscopic time was 48.16 ± 22.16 seconds in group 1 and 41.97 ± 23.99 seconds in group 2 (p = 0.29). The access tract dilation time of the one-shot dilation technique was statistically significantly shorter than that in the telescopic metal dilatation group. The mean fluoroscopic time of the one- shot dilation technique was shorter than in telescopic metal dilatation but was not statistically significant. Conclusion: One-shot dilation technique is as effective as telescopic metal dilatation, with a significant reduction in access tract dilation time.

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Dissertations / Theses on the topic "Dilation"

1

Leeds, Kevin Nathaniel. "Dilation equations with matrix dilations." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/31009.

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Michaud, Guy 1971. "Two-dimensional dilation black holes." Thesis, McGill University, 1995. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=22776.

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In this thesis, we study toy models of two-dimensional gravity. We first review two known models: the classical and quantum corrected CGHS models and the quantum corrected model of RST. These two models have black holes solutions with curvature singularities, similar to the Schwartzschild black hole. This singularity becomes naked in the RST model at a certain event during the evaporation. In the third chapter, we build a more general version with new quantum corrections beyond those presented in the RST model, which enable us to find a model without curvature singularities. We will also see that these new quantum corrections can affect the rate of Hawking radiation flowing from the black hole.

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Undrakh, Batzorig. "Rational dilation and constrained algebras." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4052.

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If a set is a spectral set for an operator T, is it necessarily a complete spectral set? That is, if the spectrum of T is contained in , and von Neumann's inequality holds for T and rational functions with poles o of , does it still hold for all such matrix valued rational functions? Equivalently, if is a spectral set for T, does T have a dilation to a normal operator with spectrum in the boundary of ? This is true if is the disk or the annulus, but has been shown to fail in many other cases. There are also multivariable versions of this problem. For example, it is known that rational dilation holds for the bidisk, though it has been recently shown to fail for a distinguished variety in the bidisk called the Neil parabola. The Neil parabola is naturally associated to a constrained subalgebra of the disk algebra, as are many other distinguished varieties. We show that the rational dilation fails on certain distinguished varieties of the polydisk DN associated to the constrained subalgebra AB := C + B(z)A(D). Here A(D) is the algebra of functions that are analytic on the open unit disk D and continuous on the closure of D, and B(z) is a nite Blaschke product of degree N 2. To this end we identify and study the set of test functions B for H1 B := C+B(z)H1(D). Among others, we show that B is minimal (in a sense that there is no proper closed subset of B is su ces).

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Pater, Colleen. "Clinical Characteristics and Rate of Dilation in Turner Syndrome Patients Treated for Aortic Dilatation." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1563872367349462.

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Ansari, Zafar A. "Limited Memory Space Dilation and Reduction Algorithms." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/9569.

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In this thesis, we present variants of Shor and Zhurbenko's r-algorithm, motivated by the memoryless and limited memory updates for differentiable quasi-Newton methods. This well known r-algorithm, which employs a space dilation strategy in the direction of the difference between two successive subgradients, is recognized as being one of the most effective procedures for solving nondifferentiable optimization problems. However, the method needs to store the space dilation matrix and update it at every iteration, resulting in a substantial computational burden for large-sized problems. To circumvent this difficulty, we first develop a memoryless update scheme. In the space transformation sense, the new update scheme can be viewed as a combination of space dilation and reduction operations. We prove convergence of this new algorithm, and demonstrate how it can be used in conjunction with a variable target value method that allows a practical, convergent implementation of the method. For performance comparisons we examine other memoryless and limited memory variants, and also prove a modification of a related algorithm due to Polyak that employs a projection on a pair of Kelley's cutting planes. These variants are tested along with Shor's r-algorithm on a set of standard test problems from the literature as well as on randomly generated dual transportation and assignment problems. Our computational experiments reveal that the proposed memoryless space dilation and reduction algorithm (VT-MSDR) and the proposed modification of the Polyak-Kelly cutting plane method (VT-PKC) provide an overall competitive performance relative to the other methods tested with respect to solution quality and computational effort. The r-Algorithm becomes increasingly more expensive with an increase in problem size, while not providing any gain in solution quality. The fixed dilation (with no reduction) strategy (VT-MSD) provides a comparable, though second-choice, alternative to VT-MSDR. Employing a two-step limited memory extension over VT-MSD sometimes helps in improving the solution quality, although it adds to computational effort, and is not as robust a procedure.<br>Master of Science

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Spenler, Stephen John. "Differentially coherent trellis coded modulation with subset dilation." Thesis, University of Ottawa (Canada), 1989. http://hdl.handle.net/10393/5963.

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Penninger, Rainer [Verfasser]. "Dilation, Transport, Visibility and Fault-Tolerant Algorithms / Rainer Penninger." Bonn : Universitäts- und Landesbibliothek Bonn, 2014. http://d-nb.info/1060787091/34.

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Kribs, David Wallace. "Non-commuting n-tuples of operators and dilation theory." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ51206.pdf.

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Flórián, Mária 1953. "Endothelial dependent dilation by estrogen through the AKTPKB pathway." Thesis, McGill University, 2001. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=33757.

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Acute administration of estrogen results in the vasodilatation and in the release of nitric oxide (NO) that occurs through activation of the serine-threonine kinase Akt/protein-kinase-B (PKB), which is known to increase the eNOS activity. 10-8 M of 17-beta-estradiol resulted in a left shift of the vasodilatory response to Ach in preconstricted aortic rings from oophorectomized rats (EC50 = 0.7 x 10-8 M with 17-beta-estradiol and 0.15 x 10-7 M of Ach without 17-beta-estradiol, P < 0.05). The effect was blocked by pre-treatment with Wortmannin, a PI(3)K inhibitor. AKT/PKB was phosphorylated in endothelial cells (EC) as early as 1-minute after estradiol-stimulation. Phosphorylation of eNOS and NO release in EC treated with 17-beta-estradiol were also increased. We conclude that the AKT/PKB pathway is involved in the acute release of NO by estrogen.

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Strauch, Christoph [Verfasser]. "On target selection indicated by pupil dilation / Christoph Strauch." Ulm : Universität Ulm, 2021. http://d-nb.info/1235527913/34.

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Books on the topic "Dilation"

1

Center, Langley Research, ed. Modeling the pressure-dilation correlation. National Aeronautics and Space Administration Langley Research Center, 1991.

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Sarkar, Shondeep L. Modeling the pressure-dilation correlation. National Aeronautics and Space Administration Langley Research Center, 1991.

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Sarkar, Sutanu. Modeling the pressure-dilation correlation. ICASE, 1991.

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Constantinescu, Tiberiu. Schur Parameters, Factorization and Dilation Problems. Birkhäuser Basel, 1995. http://dx.doi.org/10.1007/978-3-0348-9108-0.

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Zych, Magdalena. Quantum Systems under Gravitational Time Dilation. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-53192-2.

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Constantinescu, T. Schur parameters, factorization, and dilation problems. Birkhäuser Verlag, 1996.

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Hutson, Cecil Kirk. "Dilation and extraction" abortions: Medical procedure or infanticide. Assembly Publications Office, 1996.

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United States. National Aeronautics and Space Administration., ed. Spectral dilation of L(B,H)-valued measures and its application to stationary dilation for Banach space valued processes. National Aeronautics and Space Administration, 1988.

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9

Jarosz, Jerzy R. J-unitary dilation of a continuous semigroup of operator. [s.n.], 1990.

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Prvulovich, Elizabeth Mary. Does late thrombolysis limit left ventricular dilation following acute myocardialinfarction?. University of Manchester, 1992.

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Book chapters on the topic "Dilation"

1

Kao, Ming-Yang. "Dilation." In Encyclopedia of Algorithms. Springer US, 2008. http://dx.doi.org/10.1007/978-0-387-30162-4_110.

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Rao, Vijaya, and Robert Kavitt. "Pneumatic Dilation." In Achalasia. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-13569-4_6.

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Gohberg, I., M. A. Kaashoek, and S. Goldberg. "Dilation Theory." In Classes of Linear Operators Vol. II. Birkhäuser Basel, 1993. http://dx.doi.org/10.1007/978-3-0348-8558-4_9.

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Rafelski, Johann. "Time Dilation." In Relativity Matters. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-51231-0_4.

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Busch, Paul, Pekka Lahti, Juha-Pekka Pellonpää, and Kari Ylinen. "Dilation Theory." In Quantum Measurement. Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-43389-9_7.

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Wolter, Christopher, and Roger Dmochowski. "Urethral Dilation." In The Handbook of Office Urological Procedures. Springer London, 2008. http://dx.doi.org/10.1007/978-1-84628-706-0_19.

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Danda, Sravan, Aditya Challa, and B. S. Daya Sagar. "Morphological Dilation." In Encyclopedia of Mathematical Geosciences. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-030-85040-1_212.

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Strohm, Thomas. "Time Dilation." In Special Relativity for the Enthusiast. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-21924-5_9.

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Carretero, C., and M. Muñoz-Navas. "Pyloric Dilation." In Frontiers of Gastrointestinal Research. KARGER, 2009. http://dx.doi.org/10.1159/000258360.

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Danda, Sravan, Aditya Challa, and B. S. Daya Sagar. "Morphological Dilation." In Encyclopedia of Mathematical Geosciences. Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-26050-7_212-1.

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Conference papers on the topic "Dilation"

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Fan, Yuehui, Baoyao Yang, Meng Shen, and Fei Lyu. "Domain Dilation for Single Domain Generalization." In 2024 IEEE International Conference on Image Processing (ICIP). IEEE, 2024. http://dx.doi.org/10.1109/icip51287.2024.10648093.

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Bansal, Nupur, Abhishek Soni, Anil Khurana, Yashpal Verma, Paramjeet Kaur, and Ashok Kumar Chauhan. "Vaginal dilator therapy to prevent stenosis from radiotherapy: A systematic review." In 16th Annual International Conference RGCON. Thieme Medical and Scientific Publishers Private Ltd., 2016. http://dx.doi.org/10.1055/s-0039-1685362.

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Background: Pelvic radiotherapy may damage the vagina and cause vaginal stenosis. Its incidence in the literature ranges from 1.2% to 88%. To prevent vaginal stenosis, routine vaginal dilation is recommended during and after pelvic radiotherapy. Materials and Methods: The objective was to examine critically the evidence behind this guideline. Searches included the Cochrane Central Register of Controlled Trials, MEDLINE, EMBASE and Google scholarly articles. All the relevant articles were included in the study. Discussion: Various studies gave recommendations on dilation during or immediately after radiotherapy. Literature does not support routine vaginal dilatation during or immediately after pelvic radiotherapy. Occasional penetration might prevent the sides of the vagina adhering to each other, and dilation might be valuable once the inflammatory and psychological scarring has settled. Two trials demonstrated that encouraging vaginal dilation increased patient compliance, but no difference was found in sexual function scores in the first trial. One retrospective study reported that dilation lowered stenosis rates, but the control group is not comparable. One study involving 89 women revealed that the median vaginal length was 6 cm, six to ten weeks after radiation therapy, but women tolerated a 9-cm dilator/measurer after 4 months of dilation experience. One trial showed no significant advantage by inserting mitomycin C. A study of five women reported that vaginal stenosis can be treated by dilation even many years after radiotherapy. Dilation during or immediately after radiotherapy can cause damage, and there is no evidence that it prevents stenosis. Dilation might stretch the vagina if commenced after the inflammatory phase. Dilation has been associated with traumatic rectovaginal fistulae and psychological consequences. Conclusion: Vaginal dilation might help treat the late effects of radiotherapy, but it must not be assumed that this applies to the acute toxicity phase. Routine dilation during treatment is not supported by good evidence. Prophylactic and therapeutic dilation therapy needs to be considered separately and research is needed to determine when dilation therapy should start on a large population.

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Jouzdani, Sara, Rouzbeh Amini, and Victor H. Barocas. "Contribution of Different Physiological and Anatomical Factors to the Anterior Chamber Angle During Pupil Dilation." In ASME 2012 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/sbc2012-80453.

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Angle closure is well documented to be more severe in dilation [1, 2]. In addition, many anatomical and physiological factors associated with dilation may also contribute to severity of angle-closure. For example, population-based studies have shown that the prevalence rates of primary angle closure glaucoma (PACG) are relatively high among Asian population, particularly older women. Three potential causes for dilation-induced angle-closure have been reported: iris volume change (or lack thereof), posterior location of the dilator muscle, and (dynamic) pupillary block.

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Basistova, Martina, and Petr Lichy. "Differences in Characteristic Properties of Silica Sands from Neighbouring Deposits." In 4th International Conference on Advances in Environmental Engineering. Trans Tech Publications Ltd, 2023. http://dx.doi.org/10.4028/p-cux6wp.

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The quality of silica sand used in composite cements is crucial. A significant factor is the dilation of sand grains. In this study, two types of silica sands from related deposits were examined to identify differences in properties, such as grain size and shape, chemical purity (using SEM and XRFS), and their impact on dilation. It was found that the location supplying coarser-grained sand exhibited higher chemical purity but also 19.8% higher dilatation.

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MacGregor, M. "Wavelength dilation networks." In Opto-Canada: SPIE Regional Meeting on Optoelectronics, Photonics, and Imaging, edited by John C. Armitage. SPIE, 2017. http://dx.doi.org/10.1117/12.2283861.

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Eppstein, David, and Kevin A. Wortman. "Minimum dilation stars." In the twenty-first annual symposium. ACM Press, 2005. http://dx.doi.org/10.1145/1064092.1064142.

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Buzzo, Daniel. "Time Travel: Time Dilation." In Electronic Visualisation and the Arts (EVA 2014). BCS Learning & Development, 2014. http://dx.doi.org/10.14236/ewic/eva2014.40.

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siqi, Wu, Bai Yanli, and Zhong Si. "Study on influence factors of dilation uniformity in pulse-dilation framing camera." In Eighth Symposium on Novel Photoelectronic Detection Technology and Applications, edited by Shining Zhu, Qifeng Yu, Junhong Su, Lianghui Chen, and Junhao Chu. SPIE, 2022. http://dx.doi.org/10.1117/12.2622419.

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Chieslar, J. D. "Salt is Not a Steady-State Creep Material." In 58th U.S. Rock Mechanics/Geomechanics Symposium. ARMA, 2024. http://dx.doi.org/10.56952/arma-2024-0135.

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ABSTRACT: Steady-state creep is increasingly used to model structures hosted in salt and potash. This is presumably due to the absence of representative constitutive models available in commercial geomechanics software. We consider a standard suite of tests performed on salt. These include creep, dilation and tension. These tests are fit to a simple material model and evaluated. Simulations of a solution mine are performed with varying degrees of completeness with respect to the constitutive model. Volumetric closures are calculated. This exercise quantifies the ramifications on closure (deformations) according to the various material assumptions. It is observed that both the creep transient and dilation contribute to closure. Furthermore, if a failure criterion is considered, dilation is the most appropriate candidate. It is insufficient merely to post-process a creep calculation to evaluate the potential for dilation. By it's nature, dilation is a strain-softening response. It localizes and concentrates and therefore must be included in the constitutive calculation. 1. INTRODUCTION Numerous material models have been considered for describing salt and potash. Among these are MatMod (Miller, 1976), the WIPP creep law (Senseny, 1985) and more recently, the much researched and enhanced Munson-Dawson model (Reedlum, 2018). The principal shortcoming of these models is that each geological site is typically unique and has to be characterized anew, that is, there is not a universal constitutive model for salt nor for potash, as is typical for various metal alloys. The large suite of tests required to calibrate these models is impractical. These models typically have several tens of parameters. Tests must be diverse enough to span the basis represented by all of these parameters/freedoms and furthermore be consistent. For industrial operations, this becomes infeasible due to the expense of the expanded test regime and also the limited amount of core available, layered media, for example. Characteristic of the aforementioned models is the lack of attention to dilation. Salt and potash are complex materials, exhibiting a crystalline creep response much like metals, and also a dilational response (expansion as grains shear against one another) characteristic of granular materials, i.e., rock. Only the Munson-Dawson model addresses dilation but the corresponding state variable is a scalar. Anisotropy requires, at a minimum, a second-order tensor state variable.

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Nemiroff, Robert, Amir Shahmoradi, Charles Meegan, Chryssa Kouveliotou, and Neil Gehrels. "What Causes GRB Time Dilation?" In GAMMA-RAY BURST: Sixth Huntsville Symposium. AIP, 2009. http://dx.doi.org/10.1063/1.3155911.

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Reports on the topic "Dilation"

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Antonishek, John K., and Robert D. Snelick. Emulation through time dilation. National Institute of Standards and Technology, 1990. http://dx.doi.org/10.6028/nist.ir.4331.

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Boyce, Lachlan, and Devang Desai. Paclitaxel-coated balloon dilation for urethral stricture disease. BJUI knowledge, 2025. https://doi.org/10.18591/bjuik.v065.

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Brosnahan and DeVries. PR-317-10702-R01 Testing for the Dilation Strength of Salt. Pipeline Research Council International, Inc. (PRCI), 2011. http://dx.doi.org/10.55274/r0010026.

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A laboratory testing program on rock salt specimens was performed using test conditions that are consistent with the stresses that are experienced near the surfaces of salt caverns during storage operation. The proposed work effort focuses on improving the methodology for defining the onset of dilation for rock salt. Geomechanical studies use dilation criteria to assess the potential for salt damage that can lead to spalling in the cavern roof and/or walls and subsequent damage to the cavern or hanging string. This constraint is often the one that limits the minimum gas pressure in a natural gas storage cavern. This report documents the PRCI funded follow-on activities to the recently completed Gas Storage Technology Consortium project [DeVries, 2010]. The work activities completed include the following: Laboratory dilation strength testing of eight specimens having preconditioning durations longer than 10 days. Numerical modeling to identify and optimize an appropriate specimen shape for dilation testing in triaxial extension states of stress. Laboratory constant mean stress extension testing on the optimized specimen shape. DeVries [2010] documented the effects of the preconditioning durations on the dilation strength of salt specimens. Preconditioning of specimens is the process whereby specimens are subject to a relatively high hydrostatic stress for a specified period of time. It is believed that preconditioning mitigates some of the damage to the specimens induced by coring, transporting, and specimen preparation. The study documented by DeVries [2010] suggests that increasing the preconditioning duration increases the dilation strength of salt, with the maximum precondition duration limited to 10 days. This project expands upon these findings through additional testing to determine if preconditioning durations longer than 10 days has any additional benefit. In addition to the preconditioning task, this study will also investigate the variability issues observed during dilation strength tests performed under triaxial extension states of stress. It is hypothesized that the high variability seen in extensional test results might be attributed to end effects caused by (1) the friction at the specimen-platen interface and (2) specimens breaking outside the range measured by gages. To help reduce frictional effects and breakage location issues, numerical models of alternate specimen shapes were created to provide a basis for testing a new specimen geometry. Laboratory tests were performed on the new specimen geometry to validate any of its possible benefits.

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Leighton, F. T., Bruce M. Maggs, and Andrea W. Richa. Fast Algorithms for Finding O(Congestion + Dilation) Packet Routing Schedules,. Defense Technical Information Center, 1996. http://dx.doi.org/10.21236/ada311323.

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Geppert-Kleinrath, Hermann. Enhanced gamma reaction history measurements with the new Pulse Dilation – Photomultiplier Tube. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1441289.

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Lee, A. Intrinsic and cosmological signatures in gamma-ray burst time profiles: Time dilation. Office of Scientific and Technical Information (OSTI), 2000. http://dx.doi.org/10.2172/753295.

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Zusin, Dmitriy, Ezio Iacocca, Loic Le Guyader, et al. Ultrafast domain dilation induced by optical pumping in ferromagnetic CoFe/Ni multilayers. Office of Scientific and Technical Information (OSTI), 2020. http://dx.doi.org/10.2172/1969372.

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Geppert-Kleinrath, Hermann. The new Pulse Dilation-PMT and high bandwidth gamma reaction history at NIF. Office of Scientific and Technical Information (OSTI), 2019. http://dx.doi.org/10.2172/1499321.

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Kocevski, Daniel, and Vahe Petrosian. On The Lack of Time Dilation Signatures in Gamma-ray Burst Light Curves. Office of Scientific and Technical Information (OSTI), 2013. http://dx.doi.org/10.2172/1074191.

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Mulhern, Octavia, Rehan Niazi, Tahira Parveen, and Susheela Singh. Postabortion Care in Pakistan: 2023 Assessment of the Health System’s Capacity to Provide Care. Guttmacher Institute, 2024. http://dx.doi.org/10.1363/2024.300497.

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Key Points Postabortion care is widely available in Pakistan: 80% of public and private health facilities across the country’s four provinces and three regions provide these services. To treat abortion complications, 77% of facilities offer misoprostol; 34% offer dilation and evacuation, a recommended method for complications in the second trimester or later; and 24% offer vacuum aspiration. Fifty percent of facilities offer dilation and curettage, a procedure not recommended for postabortion treatment. Comprehensive care for abortion complications is more widely available in urban areas than in rural areas, and at more referral and higher-level facilities than primary-level facilities. Provision of a range of modern, reversible contraceptive methods—four or more methods—as part of postabortion care is higher at primary-level facilities in the public sector than those in the private sector (53% vs. 44%). Provision of at least one permanent contraceptive method is low nationally among higher-level facilities in both sectors (35%). Several components necessary for postabortion care are low among facilities at the primary level: 54% have means of communicating with referral facilities, 34% have staff trained in vacuum aspiration and 27% have transportation available for patients needing referral.

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