Artykuły w czasopismach: „DIAPHRAGM DISCONTINUITY”

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Hazra, Mrityunjoy, i Satyapal Singh. "Failures of Flexible Diaphragm Couplings of Power Take Off (PTO) Shafts of an Aircraft by Surface Discontinuity, Controlled by Stress Concentration or Stress Intensity Factor". International Journal of Engineering Materials and Manufacture 5, nr 2 (25.06.2020): 29–39. http://dx.doi.org/10.26776/ijemm.05.02.2020.01.

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Failures of two power take off (PTO) shafts of an aircraft have been analysed. Two shafts, one each developed by two different manufacturers failed separately during power run endurance test conducted at room temperature and ambient normal atmosphere. In both the cases, cracks were observed on the outer diaphragm disc. One shaft showed cracking in the engine side, while the other one exhibited cracks in the aircraft mounting accessory gearbox (AMAGB) side. Chemical analysis, microstructure and hardness evaluation indicate that the diaphragm material of the shafts is Ti-6Al-4V alloy used in solution treated and aged condition, as per the desired specification AMS 4928. Microstructural in-homogeneity, possibly a result of improper forging, was observed in diaphragm material of both the shafts. Additionally, surface discontinuities induced by forging and subsequent insufficient machining were noticed on the diaphragms. The diaphragms failed by fatigue with cracks possibly nucleating at surface discontinuities. Discontinuities with lower availability in one shaft led to somewhat increased life (466 million cycles) as compared to the life (104 million cycles) of the other shaft. Another possible factor contributing to lower life in the later shaft is the presence of higher quantity of nitrogen rich inclusions. Controlling factor triggering the failure of diaphragm of shaft with lower life seems to be the available high stress level along the rim periphery, while that for shaft with higher life is presence of few localized sharp surface discontinuities.

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Doiphode, Dr G. S., i Vaibhav Dhndhukiya. "Performance Based Seismic Assessment of Masonry Infilled RCC Building with Diaphragm Discontinuity". International Journal of Engineering and Advanced Technology 10, nr 2 (30.12.2020): 214–20. http://dx.doi.org/10.35940/ijeat.b2090.1210220.

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In multistoreyed RCC framed buildings, critical damages are due to seismic ground excitations, which cause catastrophic failuresat the weaker locations. Buildings with two types of structural irregularities namely diaphragm discontinuity and open ground story are considered. Assessment of seismic vulnerability of these buildings is done by using Nonlinear Static Pushover Analysis (NSPA). Performance Based Seismic Design of masonry infilled RCC buildings with two different shape of openings in the diaphragm is considered here with Design Basis Earthquake(DBE) and Maximum Considered Earthquake(MCE) where by selecting appropriate performance criteria in terms of Inter-story drift ratio(IDR) and Inelastic displacement demand ratio(IDDR) are critically observed. The Equivalent Linearization Procedure of Pushover analysis presented in FEMA 440, which is a modification of Capacity Spectrum Method based on ATC-40 guidelines, is performed in ETABS-2016 to study the performance of R.C.C. buildings with diaphragm discontinuity, designed as per IS-1893-2016.

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Citterio, Giorgio, i Emilio Agostoni. "Discontinuity between inspiratory and postinspiratory diaphragm activity in man and rabbit". Respiration Physiology 64, nr 3 (czerwiec 1986): 295–306. http://dx.doi.org/10.1016/0034-5687(86)90123-4.

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Vasudev, Deepali. "Comparative Study on Seismic Analysis of Multi Storied RC Framed Structure with and without Diaphragm Discontinuity". International Journal for Research in Applied Science and Engineering Technology 9, nr 10 (31.10.2021): 657–62. http://dx.doi.org/10.22214/ijraset.2021.38474.

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Abstract: Any Structure that is designed in today’s world has to be designed not only for aesthetics but also for stability. These days high rise multi storied structures are quiet prominent. These types of structures, should not only be designed for aesthetic point of view but also must be designed to resist earthquake forces which are subjected on these structures. These earthquake forces acting on the structures are also known as seismic forces. Due to architectural purposes, some buildings, have openings, provided in them, this creates structural discontinuities in the building. These openings or discontinuities can change the load transfer path of the structures which may cause significant change in the building behavior, under the application of the seismic forces. In this paper pushover analysis is carried out to study the behavior of the building in case of architectural opening for staircase or cut outs etc which results in discontinuity in the structure. Keywords: Diaphragm, Discontinuity, ETABS, Pushover Analysis, Seismic

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Wielgos, Miroslaw, i Przemyslaw Kosinski. "Severe Congenital Diaphragmatic Hernia—Exemplary Management in Poland: Fetoscopic Endotracheal Occlusion". Donald School Journal of Ultrasound in Obstetrics and Gynecology 10, nr 2 (2016): 178–79. http://dx.doi.org/10.5005/jp-journals-10009-1464.

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ABSTRACT Congenital diaphragmatic hernia (CDH) is a developmental closure defect resulting in discontinuity of the diaphragm. Abdominal viscera herniate into the chest leading to mediastinal shift and lung compression. Congenital diaphragmatic hernia occurs in approximately 1 in 4,000 live births. Vast majority of cases is on the left side of the diaphragm. Congenital diaphragmatic hernia is also associated with severe pulmonary hypoplasia and pulmonary arterial hypertension. Approximately 50 to 70% of cases of CDH are isolated, but may also be associated with rare and severe genetic syndromes. It is one of the most severe birth defects with extremely high neonatal mortality and morbidity. Prognosis is worse in cases of an abnormal chromosomal microarray, severe associated anomalies, right-sided defect, liver herniation, and lower fetal lung volume. In some countries, fetoscopic endotracheal occlusion (FETO) for severe CDH is offered to selected group of patients. Since 2014, this procedure is also available in Poland in the 1st Department of Obstetrics and Gynecology of Medical University of Warsaw. This article reviews management in diaphragmatic hernia and presents protocol implemented in our center. How to cite this article Wielgos M, Kosinski P. Severe Congenital Diaphragmatic Hernia—Exemplary Management in Poland: Fetoscopic Endotracheal Occlusion. Donald School J Ultrasound Obstet Gynecol 2016;10(2):178-179.

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Zhao, Min, Wen Ru Lu i Lin Ma. "Design Optimization of Steel Anchor Beam in Cable-Pylon Composite Anchor Structure". Applied Mechanics and Materials 501-504 (styczeń 2014): 1374–77. http://dx.doi.org/10.4028/www.scientific.net/amm.501-504.1374.

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Because the stress concentration usually appears in the plate corner or discontinuity zone, it is necessary to optimize design for local plate of steel anchor beam bearing huge cable force. Based on 3D elaborate finite-element method, the stress distribution of steel anchor beam of cable-pylon composite anchor structure was analyzed. The results showed that the steel anchor beam of cable-pylon composite anchorage structure was safe and reliable, the application of the vertical stiffened plate of the side plate in anchor box and the middle diaphragm efficiently improved the force state of the steel anchor beam, on the other hand the stress conditions of the concrete pylon was more ideal when the steel anchor beam was within the boundary condition of one end of anchor beam fixed and the other end with sliding support.

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Bogdan, George, Antonio Cotea, Florin Dumitru Mihălţan i Ancuţa Alina Constantin. "Bochdalek Hernia in an 83-Year-Old Ex-Pulmonology Nurse". Internal Medicine 20, nr 2 (1.07.2023): 89–94. http://dx.doi.org/10.2478/inmed-2023-0250.

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Abstract Bochdalek hernia (BH) represents the herniation of abdominal visceral components through a discontinuity between the lateral (costal) and posterior (crural) components of the diaphragm. With an incidence directly proportional to age, it is rare in adults, with reported frequencies in the specialized literature ranging from 0.17% to 6% of all diaphragmatic hernias, and it is the most common type of congenital diaphragmatic hernia, affecting the left hemidiaphragm in 85% of cases(1,2). The authors describe the case of an 83-year-old patient, a former nurse in a pneumology department, diagnosed with Bochdalek hernia, which mimicked a suspicious neoplastic lung mass. The patient's clinical context and conducted investigations established the benign etiology of the formation, without requiring further surgical intervention. Additionally, we provide a brief review of the medical literature on this topic, radiological approaches, and the importance of differential diagnosis.

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Podvysotckii, Aleksei A., Mikhail P. Sainov i Andrey Yu Kirichenko. "Performance comparison of various types of embankment dams in relation to the conditions of the Mullalakh HPP". Vestnik MGSU, nr 2 (luty 2021): 202–19. http://dx.doi.org/10.22227/1997-0935.2021.2.202-219.

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Introduction. Several types of embankment dams are used in the hydraulic engineering practice. However, the choice of a dam is individual for each hydraulic engineering project, as it takes account of specific features and natural conditions. This paper compares two types of rockfill dams (the one having a concrete face and the other having an asphalt-concrete diaphragm) in relation to the Mullalakh HPP on the Pskem River in the Republic of Uzbekistan. The dam height is 85 m. The comparison was performed from the standpoint of the dam performance in case of exposure to static forces and high seismicity. Materials and methods. The analysis of (1) the stress-strain state (SSS), (2) the stability of slopes exposed to regular and irregular load combinations was conducted for two types of dams. All calculations were performed in the two-dimensional domain. The analysis of the stress-strain state took account of the non-linear behavior of the soil ground and the contact interaction between structural elements. Seismic loads, included into the scope of irregular loads, were identified using the response spectrum method applied to particular periods and self-oscillation modes. Slope stability was analyzed with regard for the stress state of soils identified in the course of SSS calculations. Results. Each type of embankment dams has its specific features. The asphalt diaphragm dam is worse at perceiving high seismic loads. Its SSS during an earthquake features strength loss and emergence of soil discontinuity zones. The disadvantage of a concrete face dam is the insufficient safety of its anti-seepage element. Supplementary measures are needed to ensure the appropriate stress state of the face. Another finding is that the slopes of both types of dam do not demonstrate a sufficient stability factor, if the slope ratio equals to 1.5 during a 9-point earthquake. Conclusions. In high seismicity regions, a concrete faced dam demonstrates better performance than the asphalt diaphragm dam if both are exposed to static and seismic forces.

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Kusama, Yusuke, i Ryota Isozaki. "Compact and Broadband Microstrip Band-Stop Filters with Single Rectangular Stubs". Applied Sciences 9, nr 2 (11.01.2019): 248. http://dx.doi.org/10.3390/app9020248.

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In this research, a compact and broadband microstrip line quarter-wavelength open circuited stub, which is the core of the band-stop filter, is studied from the viewpoint of the characteristic impedance ratio between the main transmission line and the stub line. Furthermore, a circuit pattern in which an inductive diaphragm is inserted at the stub attachment point using a stepped impedance structure is examined, and an evaluation of frequency adjustment and miniaturization is investigated. The results are compared with the well-known radial stub. Good agreement was obtained between the measured and simulated values up to 5 GHz. Good stop bandwidth was obtained, and the validity of the proposed method is confirmed. The application to other frequency bands is straightforward. The proposed structure is applicable as an alternative to the existing radial stub used for bias T to prevent the reverse flow of the Radio frequency (RF) signal to direct current (DC) source. It is also applicable for the waveguide E-plane band-stop filter, for preventing unwanted leakage from narrow gaps by substituting to a short-circuited stub with a capacitive window, by using the same approach used in the microstrip line H-plane discontinuity.

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SIMÕES-MOREIRA, J. R., i J. E. SHEPHERD. "Evaporation waves in superheated dodecane". Journal of Fluid Mechanics 382 (10.03.1999): 63–86. http://dx.doi.org/10.1017/s0022112098003796.

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We have observed propagating adiabatic evaporation waves in superheated liquid dodecane, C12H26. Experiments were performed with a rapid decompression apparatus at initial temperatures of 180–300°C. Saturated dodecane in a tube was suddenly depressurized by rupturing a diaphragm. Motion pictures and still photographic images, and pressure and temperature data were obtained during the evaporation event that followed depressurization. Usually, a front or wave of evaporation started at the liquid free surface and propagated into the undisturbed regions of the metastable liquid. The evaporation wave front moved with a steady mean velocity but the front itself was unstable and fluctuating in character. At low superheats, no waves were observed until a threshold superheat was exceeded. At moderate superheats, subsonic downstream states were observed. At higher superheats, the downstream flow was choked, corresponding to a Chapman–Jouguet condition. At the most extreme superheat tested, a vapour content of over 90% was estimated from the measured data, indicating a nearly complete evaporation wave. Our results are interpreted by modelling the evaporation wave as a discontinuity, or jump, between a superheated liquid state and a two-phase liquid–vapour downstream state. Reasonable agreement is found between the model and observations; however, there is a fundamental indeterminacy that prevents the prediction of the observed wave speeds.

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Kumaat, Ellen Joan, Berry Koloy i Ronny Estefanus Pandaleke. "DESIGN OF REINFORCED CONCRETE STRUCTURAL ELEMENTS OF ARCHIVE BUILDING WITH THE DIAPHRAGM DISCONTINUITY IRREGULARITY". Engineering and Technology Journal 8, nr 08 (12.08.2023). http://dx.doi.org/10.47191/etj/v8i8.12.

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The archive building is a building that serves as archive storage and an office. The layout of the archive building is designed to follow the standards of the National Archives of the Republic of Indonesia. This research aims to analyze and design the elements of the structure of a 4-story archive building with diaphragm discontinuity irregularity of structure. The building structure designed has 4 working floors with a building length of 25 m, a width of 18 m, and a height of 21.17 m. Based on the results of the sondir test or Cone Penetration Test (CPT), the type of soil is classified as medium soil site class (SD) and indicates that the system of structures belongs to the seismic design category (SDC) "D". The designed structural elements which are beams, columns, and slabs, have a concrete quality (f'c) of 30 MPa, a longitudinal reinforcement quality (fy) of 420 MPa, and a transverse reinforcement (fyt) of 280 MPa. To obtain structural elements that are rigid, strong, and ductile, structural elements are designed to withstand moment and shear forces. Based on the results of analysis and design, the dimensions of the structural elements for main beams are 300 x 500 mm; secondary beams are 250 x 350 mm; columns are 550 x 550 mm; and thick slabs are 130 and 150 mm and had fulfilled the requirements of "Strong Columns Weak Beams."

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"A REVIEW ON SEISMIC RESPONSE OF HIGH RISE BUILDING HAVING DIAPHRAGM DISCONTINUITY". International Journal of Advance Engineering and Research Development 4, nr 11 (30.11.2017). http://dx.doi.org/10.21090/ijaerd.39927.

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Tai, W. C., Chuan Luo, Cheng-Wei Yang, G. Z. Cao i I. Y. Shen. "Voltage-Induced Snap-Through of an Asymmetrically Laminated, Piezoelectric, Thin-Film Diaphragm Micro-Actuator—Part 1: Experimental Studies and Mathematical Modeling". Journal of Vibration and Acoustics 140, nr 5 (17.04.2018). http://dx.doi.org/10.1115/1.4039535.

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A piezoelectric thin-film microactuator in the form of an asymmetrically laminated diaphragm is developed as an intracochlear hearing aid. Experimentally, natural frequencies of the microactuator bifurcate with respect to an applied bias voltage. To qualitatively explain the findings, we model the lead-zirconate-titanate (PZT) diaphragm as a doubly curved, asymmetrically laminated, piezoelectric shallow shell defined on a rectangular domain with simply supported boundary conditions. The von Karman type nonlinear strain–displacement relationship and the Donnell–Mushtari–Vlasov theory are used to calculate the electric enthalpy and elastic strain energy. Balance of virtual work between two top electrodes is also considered to incorporate an electric-induced displacement field that has discontinuity of in-plane strain components. A set of discretized equations of motion are obtained through a variational approach.

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"Seismic Impact of Re-entrant Corner with Opening in Diaphragm on RC Building". International Journal of Recent Technology and Engineering 9, nr 1 (30.05.2020): 2380–90. http://dx.doi.org/10.35940/ijrte.a1915.059120.

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: The most important cause of damage of RC buildings during earthquake is the irregular building configuration. An RC building which are unsymmetrical and has lack of continuity in geometry, mass or load resisting elements is called as irregular buildings. This obstructs the flow of inertia forces and cause lots of damage to buildings. There are many studies carried out irregular buildings in seismic zones, but still more research is needed in this field. Therefore, this study is about the seismic response of reinforced concrete structures having combination of two plan irregularities, re-entrant corner and diaphragm discontinuity buildings. Study is performed combining this two plan irregularity criteria and analyzing the results in seismic zone 4 and 5. For this 1 is regular building, 3 re-entrant corner buildings with three variations in A/L ratio, three buildings with opening in diaphragm with three varying percentage of opening. 9 structures are made combining these buildings with the combination of two irregularities. Structures are analyzed in etas software. Parameters such as story displacement, story drift, base shear, overturning moments are determined and compared with regular buildings.

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Naples, Rebecca, Alan C. Fenton, Malcolm Brodlie, Sundeep Harigopal i Chris O'Brien. "Diaphragm electrical activity during weaning of nasal high-flow therapy in preterm infants". Archives of Disease in Childhood - Fetal and Neonatal Edition, 12.10.2022, fetalneonatal—2022–324112. http://dx.doi.org/10.1136/archdischild-2022-324112.

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ObjectiveTo determine whether electrical activity of the diaphragm (Edi) changes with weaning nasal high-flow (HF) therapy in preterm infants according to a standardised protocol.DesignProspective observational cohort study.SettingNeonatal intensive care unit.PatientsPreterm infants born at <32 weeks gestation, receiving nasal HF as part of routine clinical care.InterventionsInfants recruited to the study had their HF weaned according to set clinical criteria. Edi was measured using a modified gastric feeding tube serially from baseline (pre-wean) to 24-hours post-wean.Main outcome measuresChange in Edi from baseline was measured at four time points up to 24 hours after weaning. Minimum Edi during expiration, maximum Edi during inspiration and amplitude of the Edi signal (Edidelta) were measured. Clinical parameters (heart rate, respiratory rate and fraction of inspired oxygen) were also recorded.ResultsForty preterm infants were recruited at a mean corrected gestational age of 31.6 (±2.7) weeks. Data from 156 weaning steps were analysed, 91% of which were successful. Edi did not change significantly from baseline during flow reduction steps, but a significant increase in diaphragm activity was observed when discontinuing HF (median increase in Edideltaimmediately post-discontinuation 1.7 µV (95% CI: 0.6 to 3.0)) and at 24 hours 1.9 µV (95% CI: 0.7 to 3.8)). No significant difference in diaphragm activity was observed between successful and unsuccessful weaning steps.ConclusionsA protocolised approach to weaning has a high probability of success. Edi does not change with reducing HF rate, but significantly increases with discontinuation of HF from 2 L/min.

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Artykuły w czasopismach na temat „DIAPHRAGM DISCONTINUITY”

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