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Artykuły w czasopismach na temat „Pressure head”

Autor: Grafiati

Data publikacji: 4 czerwca 2021

Data aktualizacji: 25 lipca 2025

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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 (2021): 2260. http://dx.doi.org/10.3390/jcm10112260.

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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 me

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K, Abhinash. "DESIGN AND ANALYSIS OF PRESSURE VESSEL USING DIFFERENT MATERIALS." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 05 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem32962.

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This project explores the field of Finite Element Analysis (FEA) in relation to pressure vessels that have different head configurations, while ensuring that the cylindrical volume and thickness remain uniform. The project adheres to ASME standards, specifically Section VIII, Division I, and focuses on designing a pressure vessel that can withstand a pressure of 8 bar within a volume of 24 liters. The main objective of using FEA is to identify areas of stress concentration in each head design. In industrial settings, pressure vessels play a crucial role in containing fluids or gases under vary

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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.

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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

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Haruki, Harvhianti, Suhardi, Ahmad Munir, Abdul Aziz, and Abdul Waris. "Performance test of emitters made from sago midribs in drip irrigation systems." IOP Conference Series: Earth and Environmental Science 1230, no. 1 (2023): 012152. http://dx.doi.org/10.1088/1755-1315/1230/1/012152.

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Abstract Increasing water use efficiency can be done by using the right irrigation system according to the needs of the plants. One option for efficient water supply is a drip irrigation system. The research aims to obtain conditions with high drip uniformity values. The study was conducted by testing the level of drip uniformity at several water source head pressures conducted with three replications. The indicator of uniformity is based on the coefficient of variance. The test results show that the uniformity value is higher at lower pressures than at higher heads. The uniformity value indic

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5

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 (1993): H21—H25. http://dx.doi.org/10.1152/ajpheart.1993.264.1.h21.

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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

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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.

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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 list

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

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✓ 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 e

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8

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

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Fox, Garey A., Lucie Guertault, Celso Castro-Bolinaga, and Alexis Swanson. "Guidance on Applied Pressure Heads for Quantifying Cohesive Soil Erodibility with a Jet Erosion Test (JET)." Journal of the ASABE 65, no. 6 (2022): 1443–50. http://dx.doi.org/10.13031/ja.14884.

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Highlights Jet erosion test (JET) is a commonly used instrument for quantifying soil erodibility. Uncertainty remains on an appropriate applied pressure head to ensure high-quality JET data. Numerical analysis was used to derive minimum and maximum heads for four soil classifications. Ideal applied pressure heads depend on soil erodibility parameters and user-selected JET characteristics. Abstract. The Jet Erosion Test (JET) is one of the few instruments available for measuring cohesive soil erodibility in situ, but uncertainty remains regarding an appropriate initial applied pressure head for

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10

Trachsel, Tina, Christian Balmer, Håkan Wåhlander, et al. "Does superior caval vein pressure impact head growth in Fontan circulation?" Cardiology in the Young 26, no. 7 (2016): 1327–32. http://dx.doi.org/10.1017/s1047951115002528.

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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

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11

Kalnins, A., and D. P. Updike. "Shakedown of Torispherical Heads Using Plastic Analysis." Journal of Pressure Vessel Technology 120, no. 4 (1998): 431–37. http://dx.doi.org/10.1115/1.2842355.

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The condition of shakedown is examined for torispherical heads. The reason for using plastic analysis is to account for the strengthening that heads experience when subjected to internal pressure. Cyclic pressures are considered up to an allowable burst pressure that is based on the membrane stresses of the spherical part of the head. To simulate a proof test before service cycling, cases when the applied pressure is higher for the first cycle are also included. A definition of shakedown is used that places the limit of twice the yield strength on a fatigue stress parameter range that is defin

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12

Huang, Wei, Mingtao Hu, Rubin Wang, Jianping Zhang, and Weiya Xu. "Study on Large-Scale Geomechanical Experiments on Tunnel External Water Pressure." Water 17, no. 7 (2025): 913. https://doi.org/10.3390/w17070913.

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High external water pressure poses significant challenges to the construction of long-distance water diversion tunnels under complex geological conditions. This study developed a large-scale geomechanics model to explore the effects of tunnel depth, water head, and drained conditions on external water pressure, focusing on the Songlin Tunnel in the Central Yunnan Water Diversion Project. The results show that external water pressure is most affected by water head and tunnel depth, particularly under undrained conditions. At water heads over 160 m, the external water pressure significantly decr

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13

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 (1994): 654–60. http://dx.doi.org/10.1177/107110079401501205.

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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 du

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14

Shuster, Melanie Horbal, L. Kathleen Sekula, John C. Kern, and Jorge A. Vazquez. "Measuring Intrabladder Pressure With the Head of the Bed Elevated 30º: Evidence to Support a Change in Practice." American Journal of Critical Care 20, no. 4 (2011): e80-e89. http://dx.doi.org/10.4037/ajcc2011744.

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Background A 30° head-of-bed elevation is recommended for most critically ill patients. Measuring intrabladder pressure with the patient in this position is controversial. Objective To assess the feasibility of measuring intrabladder pressure with a 30° head-of-bed elevation. Methods A prospective, randomized, and experimental study. Patients had intrabladder pressure measured first while positioned supine with a 30° head-of-bed elevation and 25 mL of saline instilled into the bladder and again after the patients were randomly repositioned to supine without any head-of-bed elevation (flat) or

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15

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 (2014): 394–401. http://dx.doi.org/10.1111/head.12283.

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Iwase, Kazuhiro, Tetsuto Takao, Hirotoshi Watanabe, et al. "Intra-Abdominal Venous Pressure During Laparoscopic Cholecystectomy." HPB Surgery 8, no. 1 (1994): 13–17. http://dx.doi.org/10.1155/1994/13689.

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Superior vena cava (SVC) and inferior vena cava (IVC) pressures were measured serially during laparoscopic cholecystectomy in which the intra-abdominal pressure was maintained at 12mmHg. The influences of alteration of position from 15 degrees head-down to 15 degrees head-up and of the operative procedure of holding the gallbladder up to the right subphrenic space on SVC and IVC pressures were mild. IVC pressure was maintained almost equal to the intra-abdominal pressure during prolonged continuous pneumoperitoneum lasting longer than 60min, while SVC pressure did not change significantly duri

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Mr. N.Gopikrishna and Eega Tharun. "DESIGN AND STATIC THERMAL ANALYSIS OF PRESSURE VESSELS WITH VARIOUS MATERIALS USING FEM." International Journal of Engineering, Science and Advanced Technology 24, no. 10 (2024): 412–18. http://dx.doi.org/10.36893/ijesat.2024.v24i10.052.

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Stress assessments are required for a great deal of plant components, including the pressure vessel. A pressure vessel is a container designed to store liquids or gases at pressures much higher than the surrounding air. The finite element analysis of pressure vessels with various types of heads that maintain the same cylindrical volume and thickness is the focus of this project. The intended pressure vessel is made for 8 bar of pressure and 24 lit of volume in accordance with ASME standard section VIII, division I. In order to identify the source of the stress concentration zone in each kind o

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Szada-Borzyszkowska, Monika, Wojciech Kacalak, Dariusz Lipiński, and Błażej Bałasz. "Analysis of the Erosivity of High-Pressure Pulsating Water Jets Produced in the Self-Excited Drill Head." Materials 14, no. 15 (2021): 4165. http://dx.doi.org/10.3390/ma14154165.

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The dynamic impact of a water jet with a periodically changing structure can be used in various industries. The paper presents a design solution for a self-excited pulse head. This head can be used in mining for drilling holes and breaking rocks. The design of the head was developed based on computer simulations, which made it possible to learn the mechanism of impulse shaping inside the head. Tests of the water jet produced in the self-excited pulsation head showed the occurrence of periodic changes in its internal structure and pulsation frequency. A significant increase in the dynamic strea

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Jiang, Xiaojin, Enheng Wang, Xiangwei Chen, Xiangyou Xia, and Changting Shi. "Field study on macropore flow in typical Black soils of northeast China." Canadian Journal of Soil Science 92, no. 3 (2012): 559–66. http://dx.doi.org/10.4141/cjss2010-041.

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Jiang, X., Wang, E., Chen, X., Xia, X. and Shi, C. 2012. Field study on macropore flow in typical Black soils of northeast China. Can. J. Soil Sci. 92: 559–566. Macropores are important preferential pathways for the transport of water and contaminants in soil. A series of hood infiltration experiments were conducted using dye tracers (Brilliant Blue FCF) at pressure heads of −5.0 cm, −3.0 cm, and −1.0 cm at a conventional tilled site on Keshan Farm, northeast China. The study objective was to combine the test method of dye tracing with a hood infiltrometer to analyze soil subjected to conventi

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de Rooij, G. H. "Thermodynamics of the hydraulic head, pressure head, and gravitational head in subsurface hydrology, and principles for their spatial averaging." Hydrology and Earth System Sciences Discussions 5, no. 3 (2008): 1137–57. http://dx.doi.org/10.5194/hessd-5-1137-2008.

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Abstract. In order to establish a thermodynamic justification of the theoretical relationship between the hydraulic, pressure/matric, and gravitational head in subsurface hydrology, the thermodynamic literature pertaining to subsurface flow processes is reviewed. The incompressibility of liquids negates a thermodynamic definition of pressure, which gives rise to several inconsistencies in pore scale theories. At larger scales, the gravitational potential and fluid pressure are treated as additive potentials. This superposition principle is replicated in the well-established relationship betwee

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Francel, Paul C., F. Alan Stevens, Paul Tompkins, and Michael Pollay. "The importance of shunt valve position in flow characteristics of the Medtronic PS Medical Delta valve." Neurosurgical Focus 7, no. 5 (1999): E9. http://dx.doi.org/10.3171/foc.1999.7.5.10.

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This study was conducted to document the extent to which flow depends on valve position in relation to head-pressure reference. Medtronic PS Medical Delta valves (contour model, performance levels 0.5, 1.0, 1.5, and 2.0) were studied in a bench test designed to evaluate flow rates with respect to valve position in relation to the head-pressure reference postion. The valves were connected to an “infinite” reservoir by the standard inlet catheter. An initial head (proximal) pressure was selected for each valve based on package insert data. The position of the inlet catheter tip was fixed at this

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Vučajnk, Filip, Stanislav Trdan, Iztok Jože Košir, et al. "The Influence of the Spraying Pressure of an Injector Asymmetric Double Nozzle with Variable Flow on Head Fungicide Coverage, Yield, Grain Quality, and Deoxynivalenol Content in Winter Wheat." Agronomy 11, no. 1 (2020): 43. http://dx.doi.org/10.3390/agronomy11010043.

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Spraying parameters are important factors when spraying wheat heads against fusarium head blight (FHB) to control the deoxynivalenol level in the grain and to obtain high and quality yields. In 2019 and 2020, field trials were conducted in order to establish the effect of the spraying pressure (2 bar, 4 bar, and 6 bar) of special nozzles with a variable flow rate Agrotop VR 1.5 on the head fungicide coverage, yield parameters, and the deoxynivalenol (DON) value in the grain. The coverage of the front and rear sides of wheat heads increased with the increase of spraying pressure from 2 to 6 bar

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Liu, Chengming, Tao Chen, Wenzhe Kang, et al. "Study on Pressure Pulsation and Force Characteristics of Kaplan Turbine." Water 15, no. 13 (2023): 2421. http://dx.doi.org/10.3390/w15132421.

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With the continuous increase in the size and power generation of turbines, the operational characteristics of turbines under off-design conditions are gradually receiving attention. In this paper, the Reynolds time-averaged method (RANS) is applied to the unsteady calculation of three different flow rate of a large Kaplan turbine under three heads: high head, rated head and low head. The focus is on the internal flow pattern of the turbine and the hydraulic excitation characteristics under low flow conditions. The unsteady characteristics of pressure pulsation, axial force of runner, radial fo

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Weijers, René E., Geert H. I. M. Walenkamp, Henk van Mameren, and Alphons G. H. Kessels. "The Relationship of the Position of the Metatarsal Heads and Peak Plantar Pressure." Foot & Ankle International 24, no. 4 (2003): 349–53. http://dx.doi.org/10.1177/107110070302400408.

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We test the premise that peak plantar pressure is located directly under the bony prominences in the forefoot region. The right foot of standing volunteers was examined in three different postures by a CT-scanner. The plantar pressure distribution was simultaneously recorded. The position of the metatarsal heads and the sesamoids could be related to the corresponding local peak plantar pressures. The metatarsal heads 1, 4, and 5 had a significantly different position than the local peak plantar pressures. The average difference in distance between the position of the metatarsal heads and the p

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Hill, J., W. Allans, D. Malhan, and E. D. Williams. "Pressure exerted by head bandages used in otological surgery." Journal of Laryngology & Otology 107, no. 12 (1993): 1110–12. http://dx.doi.org/10.1017/s0022215100125423.

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he pressure exerted by head bandages at the operation site following ear surgery was measured using a balloon catheter and pressure transducer. The initial pressures achieved, their diminution with time and the relationship of pressure to the induction of headache in the patient were studied.The principal findings were that the standard otological head bandage is rarely tight enough to prevent haematoma formation, bandages have lost their efficacy after the first hour and headaches are associated with a significantly higher initial bandage pressure.

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Lenius, Kerry, Julie Stierwalt, Leonard L. LaPointe, Michelle Bourgeois, Giselle Carnaby, and Michael Crary. "Effects of Lingual Effort on Swallow Pressures Following Radiation Treatment." Journal of Speech, Language, and Hearing Research 58, no. 3 (2015): 687–97. http://dx.doi.org/10.1044/2015_jslhr-s-14-0210.

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Purpose This article investigated the effects of increased oral lingual pressure on pharyngeal pressures during swallowing in patients who have undergone radiotherapy for head and neck cancer. It was hypothesized that increased oral lingual pressure would result in increased pharyngeal pressures. Method A within-subject experimental design was used with 20 participants who were status post external beam radiotherapy for head and neck cancer. Participants completed typical swallows and swallows with increased lingual force during manofluoroscopic swallow studies. The swallow condition order was

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Van Gheluwe, Bart, Howard J. Dananberg, Friso Hagman, and Kerstin Vanstaen. "Effects of Hallux Limitus on Plantar Foot Pressure and Foot Kinematics During Walking." Journal of the American Podiatric Medical Association 96, no. 5 (2006): 428–36. http://dx.doi.org/10.7547/0960428.

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The effects of hallux limitus on plantar foot pressure and foot kinematics have received limited attention in the literature. Therefore, a study was conducted to assess the effects of limited first metatarsophalangeal joint mobility on plantar foot pressure. It was equally important to identify detection criteria based on plantar pressures and metatarsophalangeal joint kinematics, enabling differentiation between subjects affected by hallux limitus and people with normal hallux function. To further our understanding of the relation between midtarsal collapse and hallux limitus, kinematic varia

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Martínez-Nova, Alfonso, Javier Pascual Huerta, and Raquel Sánchez-Rodríguez. "Cadence, Age, and Weight as Determinants of Forefoot Plantar Pressures Using the Biofoot In-shoe System." Journal of the American Podiatric Medical Association 98, no. 4 (2008): 302–10. http://dx.doi.org/10.7547/0980302.

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Background: We evaluated normal plantar pressures and studied the effect of weight, cadence, and age on forefoot plantar pressures in healthy subjects by using the Biofoot (Instituto de Biomecánica de Valencia, Valencia, Spain) in-shoe measurement system. Methods: The feet of 45 healthy subjects with no evident foot or lower-limb diseases were measured with the Biofoot in-shoe system. The forefoot was divided into seven areas: the first through fifth metatarsal heads, the hallux, and the second through fifth lesser toes. Three trials of 8 sec each were recorded twice in each subject, and the

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Schlienger, Joel, Axel Pfau, Anestis I. Kalfas, and Reza S. Abhari. "Single pressure transducer probe for 3D flow measurements." E3S Web of Conferences 345 (2022): 01012. http://dx.doi.org/10.1051/e3sconf/202234501012.

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A new method of measuring 3D flow with a single pressure transducer mounted inside the head of a single probe is presented in this paper. The 3D flow field around the hemispherical or ellipsoidal probe head is used to derive the 3D flow vector in virtual 5-sensor mode. A pressure tap located in the vicinity of the probe head connects the instantaneous pressure of the measurement volume to the pressure transducer. By turning the probe to five different positions around the axis of the stem, a set of five pressures is formed. The relevant flow parameters such as total and static pressure, yaw an

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Komasawa, Nobuyasu, Ryosuke Mihara, Kentaro Imagawa, Kazuo Hattori, and Toshiaki Minami. "Comparison of Pressure Changes by Head and Neck Position between High-Volume Low-Pressure and Taper-Shaped Cuffs: A Randomized Controlled Trial." BioMed Research International 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/386080.

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The present study compared changes in cuff pressure by head and neck position between high-volume low-pressure (HVLP) and taper-shaped (taper) cuffs in a prospective randomized clinical trial.Methods. Forty patients were intubated using tracheal tubes with either HVLP (n=20; HVLP group) or taper-shaped (n=20; Taper group) cuffs. Initial cuff pressure was adjusted to 15, 20, or 25 cmH2O in the neutral position. Cuff pressure was evaluated after changing the head and neck positions to flexion, extension, and rotation.Results. Cuff pressure significantly increased with flexion in both HVLP and Ta

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Zhang, Kai, Bo Song, and Delan Zhu. "The Development of a Calculation Model for the Instantaneous Pressure Head of Oscillating Water Flow in a Pipeline." Water 11, no. 8 (2019): 1583. http://dx.doi.org/10.3390/w11081583.

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Sinusoidal oscillating water flow at low pressure can improve the anti-clogging ability of an emitter in drip irrigation or the water distribution of a nozzle in sprinkler irrigation and reduce the cost and energy consumption of the irrigation system. In this study, the characteristics of instantaneous pressure head attenuation of oscillating water flow along a pipeline have been investigated. By using a complex function to solve the continuity equation and the momentum equation of a pipeline with water hammer motion and using the Darcy–Weisbach formula to estimate the head loss, a calculation

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Petersen, Lonnie G., Richard S. Whittle, Justin H. Lee, et al. "Gravitational effects on intraocular pressure and ocular perfusion pressure." Journal of Applied Physiology 132, no. 1 (2022): 24–35. http://dx.doi.org/10.1152/japplphysiol.00546.2021.

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Maintaining appropriate ocular perfusion pressure (OPP) is critical for ocular health. We measured the relative changes in intraocular and mean arterial pressures during 360° tilt and calculated OPP, which was elevated during head-down tilt and decreased during head-up tilt. Experimental data are also explained by our computational model. We demonstrate that OPP is more gravitationally dependent than previously recognized and may be a factor in the overall patho-etiology behind the weightlessness-induced spaceflight-associated neuro-ocular syndrome.

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Supadi, Supadi, Parji Santosa, and Nuryamah Nuryamah. "Head Elevation On Mean Arterial Pressure, Blood Pressure and Intracranial Pressure Among Hemorrhagic Stroke Patients." Jurnal Riset Kesehatan 1, no. 1 (2015): 57–63. https://doi.org/10.31983/jrk.v1i1.285.

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The aim of the study was to investigate the effect of head elevation on mean arterial pressure, blood pressure, and intracranial pressure among hemorrhagic stroke at the Margono Soekarjo Hospital Purwokerto on 2011. The study was employed quasi experimental design pre and post test with control group. This research used analytical descriptive. And, the data was analyzed by t test dependent and chi square analysis approach. There was significant effect of head elevation positioning on mean arterial pressure, blood pressure, and intracranial pressure among hemorrhagic stroke patients after the t

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Cho, H., and G. H. de Rooij. "Pressure head distribution during unstable flow in relation to the formation and dissipation of fingers." Hydrology and Earth System Sciences 6, no. 4 (2002): 763–71. http://dx.doi.org/10.5194/hess-6-763-2002.

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Abstract. Wetting front instability creates a shallow induction zone from which fingers emerge that rapidly transport water and solutes downwards. How the induction zone affects finger location and spacing is unknown. In the moist subsoil, fingers may well dissipate because the finger tips no longer have to overcome the water entry value. Both flow regions were investigated in a two-dimensional chamber with a fine-over-coarse glass bead porous medium. A capillary fringe was created by upward wetting through capillary rise. Upon ponding with dye-coloured water, fingers emerged, propagated downw

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Soltani, Negin, Ali Jalalvand, and Mohammad Reza Jahani. "Comparison of Plantar Force, Pressure and Impulse During Walking in Men and Women With Flat Feet." Journal of Sport Biomechanics 7, no. 2 (2021): 94–107. http://dx.doi.org/10.32598/biomechanics.7.2.2.

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Objective: This study aims to compare the variables of plantar force, pressure and impulse during walking in men and women with flat feet. Methods: The study population consists of non-athlete students with and without flat feet. Of these, 48 (male and female) were selected as study samples. The peak pressure, force and impulse on the foot were measured during walking by a foot scanner at a sampling frequency of 253 Hz. Shapiro-Wilks test was used to examine the normality of data distribution, and data analysis was performed using MANOVA in SPSS software, considering the significance level at

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Williams, A., and SM Coyne. "Effects of neck position on intracranial pressure." American Journal of Critical Care 2, no. 1 (1993): 68–71. http://dx.doi.org/10.4037/ajcc1993.2.1.68.

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OBJECTIVE: To investigate the effects of four nonneutral neck positions on intracranial pressure. DESIGN: An alternating treatment design was used to investigate the effect on intracranial pressure of rotation of the head to the left and right, neck flexion and neck extension. Each experimental position was separated by a neutral recovery period. SETTING: Neurological intensive care units in two tertiary care centers in the southwestern United States. SUBJECTS: Ten patients whose intracranial pressure was being therapeutically monitored but who were not experiencing prolonged periods of elevat

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GÜNGÖR, Kıvanç, and Sevim Ayça SEYYAR. "Optic Nerve Head in Case of Increased Intraocular Pressure, High Intracranial Pressure and Increased Intracranial Pressure with Simultaneous Intraocular Pressure." Güncel Retina Dergisi (Current Retina Journal) 9, no. 2 (2024): 164–68. http://dx.doi.org/10.37783/crj-0451.

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The optic nerve, as part of the central nervous system, is surrounded by meninges and cerebrospinal fluid (CSF). This review discusses the effects of increased intraocular pressure (IOP), elevated intracranial pressure (ICP), and the simultaneous rise in both pressures on the optic nerve head (ONH). Increased IOP, caused by the balance of aqueous humor production and drainage, can lead to glaucomatous optic neuropathy, particularly through mechanical and ischemic damage to the lamina cribrosa. Elevated ICP, characterized by increased CSF pressure, can result in optic nerve edema, impairing axo

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

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Haris, Fahni, Yih-Kuen Jan, Ben-Yi Liau, et al. "The effects of different inner pressures of air insoles and walking durations on peak plantar pressure." Medicine 102, no. 43 (2023): e35704. http://dx.doi.org/10.1097/md.0000000000035704.

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Background: Exercise reduces chronic complications in individuals with diabetes and peripheral vascular diseases. In clinical practice, the use of air insole may reduce peak plantar pressure (PPP), and risk for diabetic foot ulcers (DFUs). However, there is no guideline on selecting air insole pressure for effectively reducing PPP. Therefore, this study aimed to investigate the effects of different air insole pressure on PPP at different walking durations. Methods: We tested 13 participants using repeated measures study design, including 3 air insole pressures (80, 160, and 240 mm Hg) and 2 wa

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CAI, ZHIHUA, YUN XIA, and XINGYUAN HUANG. "ANALYSES OF PEDESTRIAN’S HEAD-TO-WINDSHIELD IMPACT BIOMECHANICAL RESPONSES AND HEAD INJURIES USING A HEAD FINITE ELEMENT MODEL." Journal of Mechanics in Medicine and Biology 20, no. 01 (2019): 1950063. http://dx.doi.org/10.1142/s0219519419500635.

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Head injuries in the vehicle crashes or pedestrian accidents can usually cause death or permanent disabilities, and head injuries resulting from the impact of car windshields remain a major problem. Anatomically, more realistic head models are required to more accurately document and evaluate the head-to-windshield impact responses and head injuries. The current study developed a head finite element model and carried out various simulations to investigate the head-to-windshield impact biomechanical responses and assess the head injuries. First, a 50th percentile three-dimensional finite elemen

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Wester, T. E., A. D. Cherry, N. W. Pollock, et al. "Effects of head and body cooling on hemodynamics during immersed prone exercise at 1 ATA." Journal of Applied Physiology 106, no. 2 (2009): 691–700. http://dx.doi.org/10.1152/japplphysiol.91237.2008.

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Immersion pulmonary edema (IPE) is a condition with sudden onset in divers and swimmers suspected to be due to pulmonary arterial or venous hypertension induced by exercise in cold water, although it does occur even with adequate thermal protection. We tested the hypothesis that cold head immersion could facilitate IPE via a reflex rise in pulmonary vascular pressure due solely to cooling of the head. Ten volunteers were instrumented with ECG and radial and pulmonary artery catheters and studied at 1 atm absolute (ATA) during dry and immersed rest and exercise in thermoneutral (29–31°C) and co

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Pertami, Sumirah Budi, Sulastyawati Sulastyawati, and Puthut Anami. "EFFECT OF 30° HEAD-UP POSITION ON INTRACRANIAL PRESSURE CHANGE IN PATIENTS WITH HEAD INJURY IN SURGICAL WARD OF GENERAL HOSPITAL OF Dr. R. SOEDARSONO PASURUAN." Public Health of Indonesia 3, no. 3 (2017): 89–95. http://dx.doi.org/10.36685/phi.v3i3.131.

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Background: Head-injured patients have traditionally been maintained in the head-up position to ameliorate the effects of increased intracranial pressure (ICP). However, it has been reported that the 15 degrees head-up position may improve cerebral perfusion pressure (CPP) and outcome. We sought to determine the impact of 30 and 15 degrees on intracranial pressure change.Methods: This was a quasi-experimental study with posttest only control time series time design. There were 30 head-injured patients was selected using consecutive sampling, with 15 assigned in the treatment (30° head-up posit

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Lavoie, J. P., J. R. Pascoe, and C. J. Kurpershoek. "Effect of head and neck position on respiratory mechanics in horses sedated with xylazine." American Journal of Veterinary Research 53, no. 9 (1992): 1652–57. http://dx.doi.org/10.2460/ajvr.1992.53.09.1652.

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SUMMARY We studied the temporal changes in respiratory mechanics associated with xylazine administration (1.1 mg/kg of body weight, iv) in standing horses (experiment 1), and determined the effects of head and neck position (experiment 2) and atropine administration (experiment 3) on the observed changes. Thoroughbred geldings, 3 to 5 years old (5 in experiment 1, 4 in experiments 2 and 3) were used. Flow rates were obtained from a pneumotachograph and a differential transducer attached to a tight-fitting mask. Electronic integration of the flow signal gave tidal volume. Total pulmonary pressu

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Jiang, Zhi Ming, Cheng Jun Wang, and Tao He. "Design and Performance Analysis of Yielding Anchor Bolt with Large Deformation." Applied Mechanics and Materials 215-216 (November 2012): 21–26. http://dx.doi.org/10.4028/www.scientific.net/amm.215-216.21.

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According to the principle of the spring constant support device, a kind of large deformation yielding anchor bolt with three elongation properties has been designed. This paper analyzes the performance of the dynamically-pressured soft rock roadway surrounding rock and support mechanism of yielding anchor, carries out the force analysis of the anchor head, derives equation of the knife-type cam and uses Matlab programming to solve the knife -shaped cam contour curve. In the condition of keeping certain anchoring force, the anchor head can produce large displacement along the anchor body in or

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Klucinec, Brian, Craig Denegar, and Rizwan Mahmood. "The Transducer Pressure Variable: Its Influence on Acoustic Energy Transmission." Journal of Sport Rehabilitation 6, no. 1 (1997): 47–53. http://dx.doi.org/10.1123/jsr.6.1.47.

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During the administration of therapeutic ultrasound, the amount of pressure at the sound head-tissue interface may affect the physiological response to and the outcome of treatment. Speed of sonification; size of the treatment area; frequency, intensity, and type of wave; and coupling media are important parameters in providing the patient with an appropriate ultrasound treatment. Pressure variations affect ultrasound transmissivity, yet pressure differences have been virtually unexplored. The purpose of this study was to assess the effects of sound head pressure on acoustic transmissivity. Th

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Feldman, Zeev, Malcolm J. Kanter, Claudia S. Robertson, et al. "Effect of head elevation on intracranial pressure, cerebral perfusion pressure, and cerebral blood flow in head-injured patients." Journal of Neurosurgery 76, no. 2 (1992): 207–11. http://dx.doi.org/10.3171/jns.1992.76.2.0207.

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✓ The traditional practice of elevating the head in order to lower intracranial pressure (ICP) in head-injured patients has been challenged in recent years. Some investigators argue that patients with intracranial hypertension should be placed in a horizontal position, the rationale being that this will increase the cerebral perfusion pressure (CPP) and thereby improve cerebral blood flow (CBF). However, ICP is generally significantly higher when the patient is in the horizontal position. This study was undertaken to clarify the issue of optimal head position in the care of head-injured patien

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Zhong, Bao Hua. "The Automobile Brake Guards against Holds the Dead (ABS) Simulation Experiment to Install the Brake Flowing Tubing Head Pressure Examination System the Design." Applied Mechanics and Materials 385-386 (August 2013): 739–42. http://dx.doi.org/10.4028/www.scientific.net/amm.385-386.739.

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This article studied one kind of automobile brake which guards against holds the dead simulation experiment to install the brake flowing tubing head pressure examination system, the control design plan, and has conducted the thorough research to the ABS brake flowing tubing head pressure change process as well as the vehicle speed change relations.This system uses the flowing tubing head pressure sensor, transforms after A/D, computer processing, through the monitor by the curve form demonstration braking system flowing tubing head pressure change, and simultaneously, through carries on the lo

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Strijdom, Louis, Vanessa Speight, and Heinz Erasmus Jacobs. "An assessment of sub-standard water pressure in South African potable distribution systems." Journal of Water, Sanitation and Hygiene for Development 7, no. 4 (2017): 557–67. http://dx.doi.org/10.2166/washdev.2017.227.

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Abstract Sub-standard residual water pressures in urban water distribution systems (WDS) are a prevalent phenomenon in developing countries – South Africa being no exception. The phenomenon of sub-standard pressure is poorly understood, with intermittent supply ultimately resulting when there is no residual pressure left in the system. This research addressed the prevalence and extent of sub-standard pressures by using hydraulic models of potable WDS for 71 South African towns, located in 17 different South African municipalities geographically spread over the country. The hydraulic models inc

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Claisse, Penny J., Jodi Binning, and Julia Potter. "Effect of Orthotic Therapy on Claw Toe Loading." Journal of the American Podiatric Medical Association 94, no. 3 (2004): 246–54. http://dx.doi.org/10.7547/0940246.

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This study demonstrates the effect of orthotic therapy for toe deformity on toe and metatarsal head pressures using a new analysis method facilitated by an in-shoe pressure-measurement system’s ability to export detailed data. Plantar pressure–time integrals in 11 individuals (22 feet) with claw deformity of the lesser toes were measured with and without toe props. Differences in pressure–time integrals at every individual sensor unit were then calculated for the two conditions, and significance was tested using the paired t-test. Plantar surface charts with contours of equal significant press

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Wong, Vickie, Zachary W. Bell, Robert W. Sptiz, et al. "Blood flow restriction maintains blood pressure upon head-up tilt." Physiology International 109, no. 1 (2022): 106–18. http://dx.doi.org/10.1556/2060.2022.00051.

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Abstract Background Orthostatic intolerance occurs in some astronauts following space flight. Although orthostatic blood pressure responses should normalize in the weeks following the return to Earth, there may be situations where an immediate short-term solution is necessary (e.g., emergency evacuation). Purpose The purpose of this study was to examine different levels of blood flow restriction on changes in blood pressure and heart rate when transitioning from supine to a head-up tilt and determine whether this change differs based on sex. Methods Eighty-nine participants (45 men, 44 women)

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