Relevant bibliographies by topics / Pressure head

Academic literature on the topic 'Pressure head'

Author: Grafiati
Published: 4 June 2021
Last updated: 2 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Contents

Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Pressure head.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Journal articles on the topic "Pressure head"

1

García-Madrid, Marta, Yolanda García-Álvarez, Francisco Javier Álvaro-Afonso, Esther García-Morales, Aroa Tardáguila-García, and José Luis Lázaro-Martínez. "Analysis of Plantar Pressure Pattern after Metatarsal Head Resection. Can Plantar Pressure Predict Diabetic Foot Reulceration?" Journal of Clinical Medicine 10, no. 11 (May 24, 2021): 2260. http://dx.doi.org/10.3390/jcm10112260.

Full text
Abstract:
To evaluate the metatarsal head that was associated with the highest plantar pressure after metatarsal head resection (MHR) and the relations with reulceration at one year, a prospective was conducted with a total of sixty-five patients with diabetes who suffered from the first MHR and with an inactive ulcer at the moment of inclusion. Peak plantar pressure and pressure time integral were recorded at five specific locations in the forefoot: first, second, third, fourth, and fifth metatarsal heads. The highest value of the four remaining metatarsals was selected. After resection of the first metatarsal head, there is a displacement of the pressure beneath the second metatarsal head (p < 0.001). Following the resection of the minor metatarsal bones, there was a medial displacement of the plantar pressure. In this way, plantar pressure was displaced under the first metatarsal head following resection of the second or third head (p = 0.001) and under the central heads after resection of the fourth or fifth metatarsal head (p < 0.009 and p < 0.001 respectively). During the one-year follow-up, patients who underwent a metatarsal head resection in the first and second metatarsal heads suffered transfer lesion in the location with the highest pressure. Patients who underwent a minor metatarsal head resection (second–fifth metatarsal heads) showed a medial transference of pressure. Additionally, following the resection of the first metatarsal head there was a transference of pressure beneath the second metatarsal head. Increase of pressure was found to be a predictor of reulceration in cases of resection of the first and second metatarsal heads.
APA, Harvard, Vancouver, ISO, and other styles
2

Lyons, T. D., and S. Simons. "HEAD PRESSURE-SOCCER." Medicine & Science in Sports & Exercise 35, Supplement 1 (May 2003): S198. http://dx.doi.org/10.1097/00005768-200305001-01108.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Graff-Radford, Steven B., and Wouter I. Schievink. "High-Pressure Headaches, Low-Pressure Syndromes, and CSF Leaks: Diagnosis and Management." Headache: The Journal of Head and Face Pain 54, no. 2 (January 16, 2014): 394–401. http://dx.doi.org/10.1111/head.12283.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Wang, Ning, Hong Qi Liu, and Shan Tung Tu. "Elastoplastic Analysis of Novel Parabola-Arc-Shaped Head for Internal Pressure Vessel." Applied Mechanics and Materials 750 (April 2015): 352–62. http://dx.doi.org/10.4028/www.scientific.net/amm.750.352.

Full text
Abstract:
In this paper, the elastoplastic stress analysis of a novel parabola-arc-shaped head subjected to internal pressure has been carried out using finite element method. Limit loads and burst pressures are obtained for various geometric parameters and compared with the conventional torispherical and ellipsoidal heads. For the same middle diameter and thickness, the novel parabola-arc-shaped head shows better mechanical performance than the torispherical head. The burst pressure is mainly determined by the size of cylinder and the burst always occurs in cylinder. The head can improve the burst load when the cylinder is relatively short. The improvement of the novel parabola-arc-shaped head is almost the same as the ellipsoidal head, while the torispherical head is slightly inferior. As the novel parabola-arc-shaped head can be more easily formed with less material consumed compared to the conventional ones, it should thus be applicable in engineering practice.
APA, Harvard, Vancouver, ISO, and other styles
5

Rosner, Michael J., and Irene B. Coley. "Cerebral perfusion pressure, intracranial pressure, and head elevation." Journal of Neurosurgery 65, no. 5 (November 1986): 636–41. http://dx.doi.org/10.3171/jns.1986.65.5.0636.

Full text
Abstract:
✓ Previous investigations have suggested that intracranial pressure waves may be induced by reduction of cerebral perfusion pressure (CPP). Since pressure waves were noted to be more common in patients with their head elevated at a standard 20° to 30°, CPP was studied as a function of head position and its effect upon intracranial pressure (ICP). In 18 patients with varying degrees of intracranial hypertension, systemic arterial blood pressure (SABP) was monitored at the level of both the head and the heart. Intracranial pressure and central venous pressure were assessed at every 10° of head elevation from 0° to 50°. For every 10° of head elevation, the average ICP decreased by 1 mm Hg associated with a reduction of 2 to 3 mm Hg CPP. The CPP was not beneficially affected by any degree of head elevation. Maximal CPP (73 ± 3.4 mm Hg (mean ± standard error of the mean)) always occurred with the head in a horizontal position. Cerebrospinal fluid pressure waves occurred in four of the 18 patients studied as a function of reduced CPP caused by head elevation alone. Thus, elevation of the head of the bed was associated with the development of CPP decrements in all cases, and it precipitated pressure waves in some. In 15 of the 18 patients, CPP was maintained by spontaneous 10- to 20-mm Hg increases in SABP, and pressure waves did not occur if CPP was maintained at 70 to 75 mm Hg or above. It is concluded that 0° head elevation maximizes CPP and reduces the severity and frequency of pressure-wave occurrence. If the head of the bed is to be elevated, then adequate hydration and avoidance of pharmacological agents that reduce SABP or prevent its rise are required to maximize CPP.
APA, Harvard, Vancouver, ISO, and other styles
6

Su, Jun, and Xiao Jing Li. "Design Method for Sealing Head of Internal Pressure Vessels in Chemical Industry." Advanced Materials Research 461 (February 2012): 17–20. http://dx.doi.org/10.4028/www.scientific.net/amr.461.17.

Full text
Abstract:
As an important apparatus of pressure vessel, sealing head, has an important role in petroleum industry, chemical industry and atomic energy industry. Sealing head of internal pressure vessels can be divided into three main types, which are convex head, conical needles head, flat head, respectively. Different heads have different calculating method to get the basic parameters and the most design formula of heads are established on the basis of membrane of the stress, and add the stress enhancement factor into the formula for the stress of the edge.therefore. In this study, the author have listed the calculating equations of the typical heads. At last, the author puts forward an example of head calculation to demonstrate the design method
APA, Harvard, Vancouver, ISO, and other styles
7

Terada, N., and T. Takeuchi. "Postural changes in venous pressure gradients in anesthetized monkeys." American Journal of Physiology-Heart and Circulatory Physiology 264, no. 1 (January 1, 1993): H21—H25. http://dx.doi.org/10.1152/ajpheart.1993.264.1.h21.

Full text
Abstract:
We examined the hypothesis that head-up and head-down tilt produce a symmetrical hydrostatic load on the veins. Venous pressure was measured in anesthetized monkeys with a transducer-tipped catheter. Changes in venous pressure gradients during head-up tilt corresponded to changes in hydrostatic load. However, changes in venous pressure gradients during head-down tilt were not symmetrical to those during head-up tilt. During head-down tilt, venous pressure in the superior vena cava rose, venous pressure around the right atrium did not change, and venous pressure in the inferior vena cava on the caudal side of the diaphragm rose considerably. The venous pressure of the inferior vena cava caudal to the renal vein then gradually decreased. The inferior vena cava passes through the central tendon of the diaphragm. Thus, during head-down tilt, the gravitational shift of venous blood is impeded by this anatomic structure, and venous pressure around the hepatic vein increases significantly. These data disproved our hypothesis that head-up and head-down tilt induced symmetrical but opposite influences on vena caval pressures.
APA, Harvard, Vancouver, ISO, and other styles
8

Trachsel, Tina, Christian Balmer, Håkan Wåhlander, Roland Weber, Hitendu Dave, Andrea Poretti, Oliver Kretschmar, and Anna Cavigelli-Brunner. "Does superior caval vein pressure impact head growth in Fontan circulation?" Cardiology in the Young 26, no. 7 (January 15, 2016): 1327–32. http://dx.doi.org/10.1017/s1047951115002528.

Full text
Abstract:
AbstractBackgroundPatients with bidirectional cavopulmonary anastomosis have unphysiologically high superior caval vein pressure as it equals pulmonary artery pressure. Elevated superior caval vein pressure may cause communicating hydrocephalus and macrocephaly. This study analysed whether there exists an association between head circumference and superior caval vein pressure in patients with single ventricle physiology.MethodsWe carried out a retrospective analysis of infants undergoing Fontan completion at our institution from 2007 to 2013. Superior caval vein pressures were measured during routine catheterisation before bidirectional cavopulmonary anastomosis and Fontan completion as well as head circumference, adjusted to longitudinal age-dependent percentiles.ResultsWe included 74 infants in our study. Median ages at bidirectional cavopulmonary anastomosis and Fontan were 4.8 (1.6–12) and 27.9 (7–40.6) months, respectively. Head circumference showed significant growth from bidirectional cavopulmonary anastomosis until Fontan completion (7th (0–100th) versus 20th (0–100th) percentile). There was no correlation between superior caval vein pressure and head circumference before Fontan (R2=0.001). Children with lower differences in superior caval vein pressures between pre-bidirectional cavopulmonary anastomosis and pre-Fontan catheterisations showed increased growth of head circumference (R2=0.19).ConclusionsPatients with moderately elevated superior caval vein pressure associated with single ventricle physiology did not have a tendency to develop macrocephaly. There is no correlation between superior caval vein pressure before Fontan and head circumference, but between bidirectional cavopulmonary anastomosis and Fontan head circumference increases significantly. This may be explained by catch-up growth of head circumference in patients with more favourable haemodynamics and concomitant venous pressures in the lower range. Further studies with focus on high superior caval vein pressures are needed to exclude or prove a correlation.
APA, Harvard, Vancouver, ISO, and other styles
9

Prata, Tiago S., and Fabio N. Kanadani. "Eye Pressure and Head Position." Ophthalmology 117, no. 11 (November 2010): 2236–37. http://dx.doi.org/10.1016/j.ophtha.2010.04.026.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Chang, An-Hsiung, Ziad U. Abu-Faraj, Gerald F. Harris, Joe Nery, and Michael J. Shereff. "Multistep Measurement of Plantar Pressure Alterations Using Metatarsal Pads." Foot & Ankle International 15, no. 12 (December 1994): 654–60. http://dx.doi.org/10.1177/107110079401501205.

Full text
Abstract:
Metatarsal pads are frequently prescribed for nonoperative management of metatarsalgia due to various etiologies. When appropriately placed, they are effective in reducing pressures under the metatarsal heads on the plantar surface of the foot. Despite the positive clinical reports that have been cited, there are no quantitative studies documenting the load redistribution effects of these pads during multiple step usage within the shoe environment. The objective of this study was to assess changes in plantar pressure metrics resulting from pad use. Ten normal adult male subjects were tested during a series of 400-step trials. Pressures were recorded from eight discrete plantar locations at the hindfoot, midfoot, and forefoot regions of the insole. Significant increases in peak pressures, contact durations, and pressure-time integrals were noted at the metatarsal shaft region with pad use ( P ≤ .05). Statistically significant changes in metric values were not seen at the other plantar locations, although metatarsal pad use resulted in mild decreases in mean peak pressures at the first and second metatarsal heads and slight increases laterally. Contact durations decreased at all metatarsal head locations, while pressure-time integrals decreased at the first, second, third, and fourth metatarsal heads. A slight increase in pressure-time integrals was seen at the fifth metatarsal head. The redistribution of plantar pressures tended to relate not only to the dimensions of the metatarsal pads, but also to foot size, anatomic foot configuration, and pad location. Knowledge of these parameters, along with careful control of pad dimensions and placement, allows use of the metatarsal pad as an effective orthotic device for redistributing forefoot plantar pressures.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Dissertations / Theses on the topic "Pressure head"

1

Chambers, Iain Robert. "Studies in human head injury." Thesis, University of Newcastle Upon Tyne, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.262899.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Ali, A. A. A.-W. "The modelling, simulation and real time control of intercranial pressure." Thesis, University of Bradford, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.233661.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Morgan, Lesley C. "Pediatric head trauma cerebral perfusion pressure as an indicator of outcome /." [Gainesville, Fla.]: University of Florida, 2003. http://purl.fcla.edu/fcla/etd/UFE0000750.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Tørklep, Anders Mathias. "Pressure oscillations during start and stop of a high head Francis turbine." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for energi- og prosessteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19323.

Full text
Abstract:
Start and stop procedures affect pressure oscillations throughout a hydropower plant. A desire to study how pressure oscillations behave during these dynamic conditions was the basis of this report. Instrumentation, experimentation and measurement analysis was conducted on a Francis model turbine in the Waterpower Laboratory at NTNU. Eight pressure transducers were calibrated and used during the experiments. Two transducers were installed in the draft tube below the turbine. One was placed in the vaneless space between the guide vanes and the impeller vanes. Three pressure transducers on an impeller vane and two transducers located at the inlet were also included in the experiments. Frequency analysis (PSD) was carried out for all the measurements to explore various pressure oscillations. Except for the low frequent oscillations (< 30 Hz), definite frequencies repeatedly dominated the frequency domain during start/stop as well as for steady state operation. The impeller vane oscillation showed an increase in pressure amplitude during guide vane closing. A bigger amplitude increase was registered for BEP than for part load and full load operation. The guide vane frequency was located in and only in the runner. The amplitude of the guide vane frequency was significant and was located for all studied operational points. The power of this oscillation decreased during guide vane closing. One specific frequency arose the question of an overtone phenomenon for the water hammer oscillation, a phenomenon, were the fundamental frequency is three times higher than the customary water hammer frequency.
APA, Harvard, Vancouver, ISO, and other styles
5

Senior, James Alexander. "Hydrostatic pressure converters for the exploitation of very low head hydropower potential." Thesis, University of Southampton, 2009. https://eprints.soton.ac.uk/73702/.

Full text
Abstract:
Much of the world's available hydropower potential has been exploited, and within the western world attention is increasingly being focussed on hydropower sites with very low head dierences. These are sites where the vertical distance through which water falls is less than ve metres, and remain unexploited as there is a recognised lack of hydropower technology avaiable to exploit these low-power sites economically. The aim of this work was therefore to develop a novel hydropower machine which could be used to viably exploit very low head dierences in river environments. A review of the hydropower technologies determined that the established machinery is primarily driven by the operational principles of impulse, reaction, or potential. It was however noticed that some less well established designs appear to be driven directly by the hydrostatic pressure which could be generated by a depth of owing water. This observation had not been previously acknowledged. It was also recognised that investigation into this operational principle could potentially result in machines that were both relatively simple, and have high ow and power capacities when compared to the established technologies. It was identied that there could be two approaches to exploiting hydrostatic pressure, and ideal theories were developed to describe both approaches. The resulting physical concepts were called Hy- drostatic Pressure Converters. Scale models of these concepts were hydraulically tested, veriying the proposed theories, and providing data from which estimates of full scale performance were made. These predicted that the two proposed designs of Hydrostatic Pressure Converter were suitable for head dif- ferences below 2.5m, normally the domain of the traditional waterwheel. They would operate with high hydraulic eciency, at around 80%, but have a signicantly greater ow capacity and power output per unit width of machine, at 500% that possible using a traditional waterwheel. In conclusion this work has identied, analysed and prototyped a novel approach to exploiting very low head hydropower potential. The resulting Hydrostatic Pressure Converters are a signicant and promising development in the eld of very low head hydropower.
APA, Harvard, Vancouver, ISO, and other styles
6

Shaw, Martin Fraser. "Modelling the time-series of cerebrovascular pressure transmission variation in head injured patients." Thesis, University of Glasgow, 2012. http://theses.gla.ac.uk/3287/.

Full text
Abstract:
Cerebral autoregulation is the process by which blood ow is maintained over a changing cerebral perfusion pressure. Clinically autoregulation is an important topic because it directly effects overall patient management strategy. However accurately predicting autoregulatory state or even modelling the underlying general physiological processes is a complex task. There are a number of models published within the literature but there has been no active attempt to compare and classify these models. Starting with the hypothesis that a physiologically based model would be a better predictor of autoregulatory state than a purely statistically based one has led us to investigate approaches to model comparison. Using three different models: a new mathematical arrangement of a physiological model by Ursino, the Highest Model Frequency (HMF) model by Daley and the Pressure reactivity index (PRx) statistical model by Czosnyka, a general comparison was carried out using the Matthews correlation coecient against a known autoregulatory state. This showed that the Ursino model was approximately three times as predictive as both the HMF model and the PRx model. However, in general, all of the models predictive accuracies were relatively poor so a number of optimisation strategies were then assessed. These optimisation strategies ultimately were formed into a generalised modelling framework. This framework draws on the ideas of mathematical topology to underpin and explain any change or optimisation to a model. Within the framework different optimisations can be grouped into four categories, each of which are explored in the text of this thesis: 1) Model Comparison. This is the simplest technique to apply where the number of models under examination are reduced based on the predictive accuracy. 2) Parameter restriction. A classical form of optimisation by constraining a model parameter to cause a better predictive accuracy. In the case of both the HMF and PRx we showed between a two hundred and six hundred percent increase in predictive accuracy over the initial assessment. 3) Parameter alteration. This change allows for related parameters to be substituted into a model. Four different alterations are explored as a surrogate measure for arterial-arteriolar blood volume the most clinically applicable of which is a transcranial impedance technique. This latter technique has the potential to be a non invasive measure correlated with both mean ICP and ICP pulse amplitude. 4) Model alteration. Allows for larger changes to the underlying structure of the model. Two examples are presented: firstly a new asymmetric sigmoid curve to overcome computational issues in the Ursino model and secondly a novel use of fractal characterisation which is applied in a wavelet noise reduction technique. The framework also gives an overview of the autoregulatory research domain as a whole as a result of its abstract nature. This helps to highlight some general issues in the domain including a more standardised way to record autoregulatory status. Finally concluding with research addressing the requirement for easier access to data and the need for the research community to cohesively start to address these issues.
APA, Harvard, Vancouver, ISO, and other styles
7

Harju, Mika. "Exfoliation glaucoma : studies on intraocular pressure, optic nerve head morphometry, and ocular blood flow." Helsinki : University of Helsinki, 2001. http://ethesis.helsinki.fi/julkaisut/laa/kliin/vk/harju/.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Brucia, Josephine Jacobs. "The effect of suction catheter insertion on head-injured adults." Case Western Reserve University School of Graduate Studies / OhioLINK, 1993. http://rave.ohiolink.edu/etdc/view?acc_num=case1060867440.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Tran, Chi Thanh. "The Effective Convectivity Model for Simulation and Analysis of Melt Pool Heat Transfer in a Light Water Reactor Pressure Vessel Lower Head." Doctoral thesis, Stockholm : Division of Nuclear Power Safety, Royal Institute of Technology, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-10671.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Kostas, Vladimir Ilyich. "EFFECT OF LOWER BODY POSITIVE PRESSURE ON CARDIOVASCULAR RESPONSE AT VARIOUS DEGREES OF HEAD UP TILT." UKnowledge, 2012. http://uknowledge.uky.edu/khp_etds/3.

Full text
Abstract:
Various models of simulated weightlessness and resulting cardiovascular effects have been researched in the last 50 years of space exploration. Examples of such models are the Alter-G (Alt-G) treadmill used for body unweighting and head-up-tilt (HUT) model each providing similar cardiovascular effects, but differing in their stimulation of vestibular centers . Advantages of using the Alt-G include: use of lower body positive pressure (LBPP) to simulate hypogravity, it acts as a countermeasure to alleviate negative cardiovascular effects of standing and provides a constant vestibular stimulus. In addition, the Alt-G shorts themselves may be providing a certain degree of LBPP, acting as a compression garment. Therefore the purpose of this study was to determine the cardiovascular effects of Alt-G shorts and how effective they are as countermeasure to deconditioning effects of space flight. This study tested cardiovascular changes in 12 men and women at 0 and 80 degrees head-up-tilt (HUT0 / HUT80) with and without Alt-G shorts using 5-lead ECG, 10-lead impedance, heart rate, systolic and diastolic blood pressure measurements at finger and arm. The tilt-induced increase in mean heart rate (HR) was significantly smaller when subjects wore the Alt-G shorts. Shorts ended up reducing HR by 2.3 bpm in supine control and by 6.7 bpm at HUT80 (p0.05. Other cardiovascular variables did not show any significant effect from shorts. In conclusion, this study was in line with results from other studies that used compression garments to determine cardiovascular effects of LBPP.
APA, Harvard, Vancouver, ISO, and other styles
More sources

Books on the topic "Pressure head"

1

Ando, Samon. Head-wave diffraction pressure computer program HEWDIP. Dartmouth, N.S: Defence Research Establishment Atlantic, 1990.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
2

International Symposium on Intracranial Pressure (6th 1985 Glasgow). Intracranial pressure 6. Berlin: Springer-Verlag, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
3

Convertino, Victor A. Responses to LBNP in men with varying profiles of strength and aerobic capacity: implications for flight crews. Kennedy Space Center: John F. Kennedy Space Center, 1993.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
4

Korth, G. E. Metallographic and hardness examinations of TMI-2 lower pressure vessel head samples. Washington, DC: Division of Systems Research, Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1994.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
5

Honeyman, Rex P. Pressure head fluctuations of the Fox Hills-Hell Creek aquifer in McKenzie County, North Dakota. [Bismarck, N.D.]: North Dakota State Water Commission, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
6

Honeyman, Rex P. Pressure head fluctuations of the Fox Hills-Hell Creek aquifer in the Knife River Basin, North Dakota. [Bismarck, N.D.]: North Dakota State Water Commission, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
7

Honeyman, Rex P. Pressure head fluctuations of the Fox Hills-Hell Creek aquifer in Billings, Golden Valley, and Slope Counties, North Dakota. [Bismarck, N.D.]: North Dakota State Water Commission, 2007.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
8

Sihera, Elaine. Heads under pressure. Marlow: Impact Connections, 1989.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
9

Fundamentals of heat exchanger and pressure vessel technology. Washington: Hemisphere Pub. Corp., 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hendricks, Robert C. Two-phase flows and heat transfer within systems with ambient pressure above the thermodynamic critical pressure. [Cleveland, Ohio: National Aeronautics and Space Administration, Lewis Research Center, 1986.

Find full text
APA, Harvard, Vancouver, ISO, and other styles
More sources

Book chapters on the topic "Pressure head"

1

Gooch, Jan W. "Head Pressure." In Encyclopedic Dictionary of Polymers, 358. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5820.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Feldman, Z., M. J. Kanter, C. S. Robertson, C. F. Contant, M. A. Sheinberg, R. K. Narayan, and R. G. Grossman. "Changes in Cerebral Hemodynamics with Head Elevation in Head-Injured Patients." In Intracranial Pressure VIII, 429–32. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77789-9_92.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Marshall, L. F. "Head Injury: Outcome in 4 Regional Head Injury Centers Preliminary Report." In Intracranial Pressure VII, 552–56. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73987-3_143.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Gennarelli, T., M. Pastusko, T. Sakamoto, G. Tomei, A. Duhaine, R. Wiser, and L. Thibault. "ICP After Experimental Diffuse Head Injuries." In Intracranial Pressure VI, 15–19. Berlin, Heidelberg: Springer Berlin Heidelberg, 1986. http://dx.doi.org/10.1007/978-3-642-70971-5_3.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Teasdale, G. M., D. I. Graham, and A. Lawrence. "Brain Swelling in Fatal Head Injuries." In Intracranial Pressure VII, 560–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73987-3_145.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Deyo, D., P. Brockenbrough, R. Briggs, P. Fatouros, and A. Marmarou. "Transporting and Monitoring the Head-Injured Patient." In Intracranial Pressure VIII, 515–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77789-9_111.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Rosner, M. J., and S. D. Rosner. "Cerebral Perfusion Pressure Management of Head Injury." In Intracranial Pressure VIII, 540–43. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77789-9_117.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Ross, A. M., S. Kobayashi, and L. H. Pitts. "ICP in the Elderly Head Injury Population." In Intracranial Pressure VII, 570–74. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73987-3_148.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Changaris, D. G., C. P. McGraw, and R. A. Greenberg. "Optimal Cerebral Perfusion Pressure in Head Injury." In Intracranial Pressure VII, 640–42. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-73987-3_166.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Marmarou, A., M. A. Abdelfattah Foda, K. Bandoh, N. Stocchetti, M. Yoshihara, and H. F. Young. "Elevated Venous Outflow Pressure in Head Injured Patients." In Intracranial Pressure VIII, 712–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 1993. http://dx.doi.org/10.1007/978-3-642-77789-9_155.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Conference papers on the topic "Pressure head"

1

Spyrou, Charidimos E., Peyman R. Nurafza, and Alain C. Gringarten. "Well-head Pressure Transient Analysis." In EAGE Annual Conference & Exhibition incorporating SPE Europec. Society of Petroleum Engineers, 2013. http://dx.doi.org/10.2118/164871-ms.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Young, P. G., C. W. Pearce, B. Walker, L. Beldie, and R. Cotton. "Head Impact Response: Pressure Analysis Simulation." In ASME 2010 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2010. http://dx.doi.org/10.1115/sbc2010-19176.

Full text
Abstract:
A new approach to generating physical and numerical models of the human head is presented. In this study, analytical, numerical and experimental models were used in parallel to explore the pressure response of the human head as a result of low velocity impact.
APA, Harvard, Vancouver, ISO, and other styles
3

Berry, Alex, Warren Brown, Antonio Seijas, and Sarah Cook. "Coke Drum Bottom Head Flange Design Optimisation." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93136.

Full text
Abstract:
Abstract Bottom head flange leaks on coke drums are a too common occurrence for coke drum operators. This paper discusses why these complex joints leak, exploring phenomena such as bolt relaxation, flange rotation, bolt hole cracking, plastic deformation of a flange face due to cyclic thermal transients, as well as investigating the effects of gasket stress variation which can lead to gasket movement and distortion during successive drum cycles. The industry trend is to install automatic bottom un-heading devices (BUDs) to facilitate safe, reliable coke removal and to increase production through shortening un-heading operations. A case study is reviewed which shows how a new drum flange, coupled to a BUD, has been optimized using Finite Element Analysis (FEA). The findings show adequate flange thickness and optimized hub dimensions are required to combat plastic deformation of the flange ring and reduce gasket stress variation. Five designs are modelled, varying the flange thickness, outside diameter and hub geometry. Due to the close proximity of a new side nozzle, the full lower section of the drum has been modelled using quarter and half symmetry FEA with applied temperature distributions from each phase of a typical coke drum cycle; heating, coking and quench. This has allowed for nozzle loadings to be evaluated and the location of the flange weld to be optimized to give the greatest fatigue life. An explanation into why periodic re-tightening is required to keep these joints tight is provided along with recommendations on suitable joint assembly techniques using a combination of bolt load verification and alternative bolting patterns from ASME PCC-1.
APA, Harvard, Vancouver, ISO, and other styles
4

Spyrou, C. E., P. R. Nurafza, and A. C. Gringarten. "Well-head Pressure Transient Analysis - (SPE-164871)." In 75th EAGE Conference and Exhibition incorporating SPE EUROPEC 2013. Netherlands: EAGE Publications BV, 2013. http://dx.doi.org/10.3997/2214-4609.20130542.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Shen, Jun, Heng Peng, Yanfang Tang, Xuemei Liu, and Yinghua Liu. "Stress Analysis of Ellipsoidal Head With Heating Spiral." In ASME 2017 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/pvp2017-65494.

Full text
Abstract:
The thermal load is one of important design condition that should be considered carefully in engineering practice. In most instances, the heat source is located inside the vessel, which causes a temperature gradient along the thickness, especially when the thickness is large. In this case, secondary stress should be considered and thermal ratcheting should be checked. In this paper, a thin-walled ellipsoidal head with heating spiral was studied. In this structure, temperature is uniformly distributed along the thickness but changes alternately between hot and cold along the meridional direction. This has a significant effect not only on the head itself but also on the nozzle. For the nozzle, its elastic support condition has been changed and then its stress distribution will also be changed. In this paper, several cases have been calculated and some laws are established. Finally, some useful conclusions and suggestions are proposed for engineering design.
APA, Harvard, Vancouver, ISO, and other styles
6

Remic, Joseph M., Neal D. Johnston, George J. Demetri, and David H. Roarty. "Methodology for Reactor Vessel Head Drop Accident Analysis." In ASME 2008 Pressure Vessels and Piping Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/pvp2008-61686.

Full text
Abstract:
Nuclear power plants are required to evaluate the risks associated with a potential accident in which the reactor vessel closure head is dropped onto a reactor with fuel installed. This is done as part of an overall effort to safely control the movement of heavy loads in a nuclear facility per NUREG-0612 [1]. In some cases, this requires that an analysis be done of the potential accident to confirm no damage to fuel would occur. This paper provides a methodology for such analysis, along with the basis for the methodology, for a typical pressurized water reactor design. The methodology uses nonlinear, dynamic transient finite element analysis to analyze the event. An example of typical results and acceptance criteria is provided.
APA, Harvard, Vancouver, ISO, and other styles
7

Frye, Charles R., Tom Alley, Melvin L. Arey, and Michael R. Robinson. "Cracking in Alloy 600/182 Reactor Vessel Head Penetrations." In ASME 2002 Pressure Vessels and Piping Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/pvp2002-1188.

Full text
Abstract:
During the last fourteen months (December 2000 through February 2002), a large effort has been expended in examining and repairing cracks in reactor vessel head penetrations on the three Oconee reactor vessel closure heads. It is a typical maintenance practice during refueling outages to inspect the top of the head to detect flange leaks or other sources of boron on the top of the head. These inspections also meet requirements imposed by the Nuclear Regulatory Commission in response to numerous leaks in alloy 600 components throughout the nuclear industry [1]. When leaks were first detected, inspections and repairs of the Oconee heads resulted in large radiation doses and long outages. Each subsequent outage has shown improvement in both dose and execution time for the repairs. Metallurgical examinations have confirmed the mechanism of cracking and industry efforts have resulted in improvements in the technologies of both inspection and repair. The results of some of the metallurgical examinations are presented along with a description of some of the improvements in welding and inspection.
APA, Harvard, Vancouver, ISO, and other styles
8

Fang, Yao-Min, and Jun-Ping Pu. "Field Tests and Simulation of Lion-Head River Bridge." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71283.

Full text
Abstract:
Lion-Head River Bridge is a parallel twin bridge. The East Bridge was designed and constructed as a traditional prestressed concrete box of bridge (Pot Bearings); and the West Bridge used seismic isolation devices (Lead Rubber Bearings). The behaviors of these two bridges are compared with each other through several field tests including the ambient vibration test, the force vibration test induced by shakers, and the free vibration test induced by push and fast release devices. During the period of this construction, the East and West bridges were strongly damaged by Chi-Chi and Chi-I earthquakes and had been retrofitted. The damage changed the natural frequencies of the bridges, which was explored from the ambient vibration test. The models of the two bridges are simulated by finite element method according to the original design and the soil-structure interaction was put into consideration in the models. Simulations were modified based on the results of the every test in the field. The dynamic parameters of the bridges are identified and compared with those from the theoretical simulation. The efficiency of isolated bridge is observed and verified.
APA, Harvard, Vancouver, ISO, and other styles
9

Hinnant, Chris. "Fatigue Testing of Welded Flat Head Pressure Vessel Joints." In ASME 2007 Pressure Vessels and Piping Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/pvp2007-26622.

Full text
Abstract:
Experimental results for the fatigue testing of several welded flat head geometries are reported. These tests are similar to those previously reported by Hinnant (2006) [1] and focus on the fatigue behavior of full penetration welds with cover fillet welds. Fatigue calculations according to several fatigue design methods are compared against the experimental results, as are the mean fatigue curves of several of the design methods. Of particular interest for these new tests is the effect of plate thickness, testing environment, and geometric effects. Nominal plate thickness values ranging from 0.0625" (1.59 mm) to 0.1875" (4.76 mm) have been tested and correlated. Four additional fatigue tests were conducted using air to determine if previous testing in room temperature tap water resulted in decreased fatigue life.
APA, Harvard, Vancouver, ISO, and other styles
10

Johnson, E. A. C., and P. G. Young. "The Analysis of Pressure Response in Head Injury." In 2006 Digital Human Modeling for Design and Engineering Conference. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2006. http://dx.doi.org/10.4271/2006-01-2368.

Full text
APA, Harvard, Vancouver, ISO, and other styles

Reports on the topic "Pressure head"

1

Bir, Cynthia. Measuring Blast-Related Intracranial Pressure Within the Human Head. Fort Belvoir, VA: Defense Technical Information Center, February 2011. http://dx.doi.org/10.21236/ada547306.

Full text
APA, Harvard, Vancouver, ISO, and other styles
2

Theofanous, T. G., and S. Syri. The coolability limits of a reactor pressure vessel lower head. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/115681.

Full text
APA, Harvard, Vancouver, ISO, and other styles
3

Urbin, J. D0 Cryo CC Pressure Vessel Head to Cylinder Weld Test Results. Office of Scientific and Technical Information (OSTI), March 1991. http://dx.doi.org/10.2172/1031774.

Full text
APA, Harvard, Vancouver, ISO, and other styles
4

Kang, Sae Byul, Young Jong Chung, Eun Hyun Lee, and Gum Jung Yoon. Development of a Diesel Engine Cylinder Head With High Combustion Pressure by Using High-Speed Head Fatigue Tester. Warrendale, PA: SAE International, May 2005. http://dx.doi.org/10.4271/2005-08-0162.

Full text
APA, Harvard, Vancouver, ISO, and other styles
5

Korth, G. E. Metallographic and hardness examinations of TMI-2 lower pressure vessel head samples. Office of Scientific and Technical Information (OSTI), March 1994. http://dx.doi.org/10.2172/10140671.

Full text
APA, Harvard, Vancouver, ISO, and other styles
6

Vo-Dinh, Tuan. Head Injury and Intracranial Pressure Monitor Using Ultrasonic and Low-Frequency (ULFA) Detection. Fort Belvoir, VA: Defense Technical Information Center, September 2000. http://dx.doi.org/10.21236/ada400159.

Full text
APA, Harvard, Vancouver, ISO, and other styles
7

Vo-Dinh, Tuan. Head Injury and Intracranial Pressure Monitor Using Ultrasonic and Low-Frequency Acoustic (ULFA) Detection. Fort Belvoir, VA: Defense Technical Information Center, September 2001. http://dx.doi.org/10.21236/ada400529.

Full text
APA, Harvard, Vancouver, ISO, and other styles
8

Cohen, Kathryn S. Relationship of Protective Mask Seal Pressure to Fit Factor and Head Harness Strap Stretch. Fort Belvoir, VA: Defense Technical Information Center, September 1999. http://dx.doi.org/10.21236/ada370293.

Full text
APA, Harvard, Vancouver, ISO, and other styles
9

Korth, G. E., D. R. Diercks, and L. A. Neimark. Results of examinations of pressure vessel samples and instrument nozzles from the TMI-2 lower head. Office of Scientific and Technical Information (OSTI), October 1993. http://dx.doi.org/10.2172/10192941.

Full text
APA, Harvard, Vancouver, ISO, and other styles
10

Hertelendy, N. A. Acceptance test report for the ultra high pressure bore head for use in the self-installing liquid observation well. Office of Scientific and Technical Information (OSTI), June 1995. http://dx.doi.org/10.2172/97031.

Full text
APA, Harvard, Vancouver, ISO, and other styles
You might also be interested in the extended bibliographies on the topic 'Pressure head' for particular source types:
Journal articles Dissertations / Theses Books
We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!

To the bibliography