Relevant bibliographies by topics / Pressure chamber

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Pressure chamber'

Author: Grafiati
Published: 4 June 2021
Last updated: 10 March 2023

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Journal articles on the topic "Pressure chamber"

1

Danilatos, Gerasimos D. "Reverse Flow Pressure Limiting Aperture." Microscopy and Microanalysis 6, no. 1 (January 2000): 21–30. http://dx.doi.org/10.1017/s1431927600000052.

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The reverse flow pressure limiting aperture is a device that creates and sustains a substantial gas pressure difference between two chambers connected via an aperture. The aperture is surrounded by an annular orifice leading to a third chamber. The third chamber is maintained at a relatively high pressure that forces gas to flow through the annular aperture into the first of said two chambers. The ensuing gas flow develops into a supersonic annular gas jet, the core of which is coaxial with the central aperture. A pumping action is created at the core of the jet and any gas molecules leaking through the aperture from the second chamber are entrained and forced into the first chamber, thus creating a substantial pressure difference between the first and second chamber.
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Danilatos, Gerasimos D. "Reverse Flow Pressure Limiting Aperture." Microscopy and Microanalysis 6, no. 1 (January 2000): 21–30. http://dx.doi.org/10.1007/s100059910002.

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Abstract The reverse flow pressure limiting aperture is a device that creates and sustains a substantial gas pressure difference between two chambers connected via an aperture. The aperture is surrounded by an annular orifice leading to a third chamber. The third chamber is maintained at a relatively high pressure that forces gas to flow through the annular aperture into the first of said two chambers. The ensuing gas flow develops into a supersonic annular gas jet, the core of which is coaxial with the central aperture. A pumping action is created at the core of the jet and any gas molecules leaking through the aperture from the second chamber are entrained and forced into the first chamber, thus creating a substantial pressure difference between the first and second chamber.
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Wang, Chuan-hao, Shu-shan Wang, Jing-xiao Zhang, and Feng Ma. "Pressure Load Characteristics of Explosions in an Adjacent Chamber." Shock and Vibration 2021 (January 21, 2021): 1–9. http://dx.doi.org/10.1155/2021/3726306.

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To learn more about dynamite explosions in confined spaces, we focused on the chamber adjacent to the main chamber, the main chamber being the location of the explosion. We investigated the characteristics of two damaging pressure loads: first reflected shock wave and quasistatic pressure. In this work, we analyzed the characteristics of the first reflected shock wave and the quasistatic pressure formed by the explosion of the chamber charge. Simulated chamber explosion experiments were carried out, where high-frequency piezoelectric sensors were used to measure the first reflected shock wave, and low-frequency piezo-resistive sensors were used to measure the quasistatic pressure. Valid and reasonable experimental data were obtained, and the experimental values of the pressure load were compared with those calculated from the classical model. The results showed that when the main chamber was partially damaged by the explosion load, the adjacent chambers were not subjected to the shock wave load, and the quasistatic pressure load was less than that in the main chamber. The presence of adjacent chambers did not affect the shock wave load in the main chamber. Using the mass of the explosive and the blast distance as input parameters, the internal explosion shock wave load parameters, including those in adjacent chambers, can be calculated. The presence of the adjacent chamber did not affect the theoretically calculated quasistatic overpressure peak in the main chamber. Using the mass of the explosive and the spatial volume of the chamber as input parameters, the quasistatic pressure load parameters of the internal explosion can be calculated, including those in the adjacent chambers.
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Segers, Patrick, Jean-Paul Belgrado, Andre Leduc, Olivier Leduc, and Pascal Verdonck. "Excessive Pressure in Multichambered Cuffs Used for Sequential Compression Therapy." Physical Therapy 82, no. 10 (October 1, 2002): 1000–1008. http://dx.doi.org/10.1093/ptj/82.10.1000.

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Abstract Background and Purpose. Pneumatic compression devices, used as part of the therapeutic strategy for lymphatic drainage, often have cuffs with multiple chambers that are inflated sequentially. The purpose of this study was to investigate (1) the relationship between cuff chamber pressure (Pchamber) and the pressure on the cuff-skin interface (Pinterface) and (2) the mechanical interaction of cuff chambers and consequences for device control. Subjects and Methods. In this study, we used 3 cylindrical (60-, 80-, and 100-mm-diameter) model limbs and 1 ellipsoidal model of the arm to test a commercially available pressure controller using “target pressures,” indicated by the controller, of 30, 60, 80, and 100 mm Hg. We studied the time course of Pchamber and Pinterface during the inflation sequence and the effect of local curvature on Pinterface. Results. Our data indicated that, overall, Pinterface is of the same order of magnitude as Pchamber. There was some effect of model diameter and shape, with the smaller curvatures yielding the highest Pinterface. Cuff chamber interaction led to Pchamber and Pinterface values in the most distal (first inflated) chamber that were up to 80% higher than the target pressure. For the 80-mm cylindrical model, for instance, pressure in this chamber reached 54, 98, 121, and 141 mm Hg, respectively, instead of the 30, 60, 80, and 100 mm Hg indicated by the controller. Discussion and Conclusion. The discrepancy between the target pressure, indicated by the controller, and the pressure measured inside the cuff chambers undermines the therapeutic control and efficacy of the pneumatic compression devices. Because the measured pressures were far beyond the pressure level indicated by the controller, it is recommended that pneumatic compression devices be used at much lower target pressures (<30 mm Hg) than those applied in clinical practice.
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Ho Cho, Seung, Olli Niemi-Pynttäri, and Matti Linjama. "Friction characteristics of a multi-chamber cylinder for digital hydraulics." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 5 (March 2, 2015): 685–98. http://dx.doi.org/10.1177/0954406215575414.

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This paper deals with the issue of defining friction characteristics of a multi-chamber cylinder for digital hydraulics. Using a multi-chamber cylinder under a set of supply pressures, friction characteristics are experimentally investigated for a range of velocity according to load conditions. A binary digit-based pressure e.g., high pressure or low pressure has been applied to each chamber. The friction force is measured based on the equation of motion using measured values of the pressures in the chambers of the multi-chamber cylinder and the position of the piston. As a mechanism to load the multi-chamber cylinder, a 1-Degree of Freedom (DOF) boom mockup mimicking a medium-sized mobile machine boom has been constructed. Then it has been utilized to test the motion of the cylinder under different mass–load conditions. It is shown that the cylinder states do not dominantly affect the friction force of a multi-chamber cylinder, comparing the effect of other parameter such as mass load and velocity, which is expected to be useful for the secondary control of digital hydraulic systems.
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Raine, N. M., and N. T. Cable. "A simplified paired neck chamber for the demonstration of baroreflex blood pressure regulation." Advances in Physiology Education 277, no. 6 (December 1999): S60. http://dx.doi.org/10.1152/advances.1999.277.6.s60.

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In this investigation a simplified variable-pressure paired neck chamber was developed as a practical alternative to traditional neck collar designs used to study the arterial baroreceptor reflex in humans. The purpose of this new design was to extend the use of the noninvasive neck chamber method of baroreceptor investigation to teachers of physiology. Performance tests indicate that these new chambers are capable of delineating the stimulus-response relationship for both the blood pressure baroreflex [sensitivity = 0.425 +/- 0.13 mmHg mean arterial pressure (MAP)/mmHg neck chamber pressure (NCP); range = 24.9 +/- 4.6 mmHg MAP] and the heart rate baroreflex (sensitivity 0.273 +/- 0.12 beats.min-1.mmHg NCP-1; range = 16.7 +/- 6.8 beats/min). This was achieved by applying localized positive and negative air pressures to the carotid sinuses throughout the range from +60 to -60 mmHg in steps of 20 mmHg. This simplified neck chamber method offers distinct methodological advantages over traditional neck collars, making it a valuable tool for demonstrating baroreflex regulation of the circulation.
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Šabacká, Pavla, Vilém Neděla, Jiří Maxa, and Robert Bayer. "Application of Prandtl’s Theory in the Design of an Experimental Chamber for Static Pressure Measurements." Sensors 21, no. 20 (October 15, 2021): 6849. http://dx.doi.org/10.3390/s21206849.

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Pumping in vacuum chambers is part of the field of environmental electron microscopy. These chambers are separated from each other by a small-diameter aperture that creates a critical flow in the supersonic flow regime. The distribution of pressure and shock waves in the path of the primary electron beam passing through the differentially pumped chamber has a large influence on the quality of the resulting microscope image. As part of this research, an experimental chamber was constructed to map supersonic flow at low pressures. The shape of this chamber was designed using mathematical–physical analyses, which served not only as a basis for the design of its geometry, but especially for the correct choice of absolute and differential pressure sensors with respect to the cryogenic temperature generated in the supersonic flow. The mathematical and physical analyses presented here map the nature of the supersonic flow with large gradients of state variables at low pressures at the continuum mechanics boundary near the region of free molecule motion in which the Environmental Electron Microscope and its differentially pumped chamber operate, which has a significant impact on the resulting sharpness of the final image obtained by the microscope. The results of this work map the flow in and behind the Laval nozzle in the experimental chamber and are the initial basis that enabled the optimization of the design of the chamber based on Prandtl’s theory for the possibility of fitting it with pressure probes in such a way that they can map the flow in and behind the Laval nozzle.
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Zhuravlyov, Yu N., S. N. Semyonov, J. N. Lukyanov, A. L. Perminov, S. I. Tikhonov, and M. A. Donchenko. "CALCULATION TEMPERATURE AND PRESSURE OF THE ROTARY ENGINE." Environment. Technology. Resources. Proceedings of the International Scientific and Practical Conference 3 (June 16, 2015): 223. http://dx.doi.org/10.17770/etr2015vol3.195.

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<p>The principles of calculating the temperature and pressure in the working chambers of the rotary vane engine with an external supply of heat are considered. The mathematical model for calculating the pressure and the temperature in the chamber with heat transfer between the working fluid and the chamber walls is built. The plots of the dependence of the pressure and the temperature in the chamber on the angle of rotation of the output shaft at the minimum and maximum temperature of the walls are obtained.</p>
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Hernandez, Francisco, Hong Hao, and Xihong Zhang. "On the effectiveness of ventilation to mitigate the damage of spherical chambers subjected to confined trinitrotoluene detonations." Advances in Structural Engineering 22, no. 2 (August 16, 2018): 486–501. http://dx.doi.org/10.1177/1369433218791610.

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This article presents a comparative study on the effectiveness of ventilation to mitigate blasting effects on chambers subjected to confined detonations of high explosives. The pressure time-history that acts on the chamber walls is described by three components: (1) the first shock wave, (2) the train of re-reflected shock waves, and (3) the gas pressure. The radial response of spherical chambers is described by the radial breathing mode and modeled by an equivalent single degree of freedom system. The three pressure components are considered for the calculation of the maximum ductility ratio, which is obtained from the numerical solution of the single degree of freedom chamber response. It is assumed that openings reduce the gas pressure but they have an insignificant effect on shock waves. The dynamic response of fully and partially confined chambers are calculated and compared. Results show that intermediate/small openings (less than 10% of the surface of the chamber) are ineffective to mitigate the chamber response and damage. The vibratory response of the chamber is susceptible to elastic or plastic resonance but it is not considerably modified by the long-term gas pressure because of its high radial breathing mode frequency, allowing concluding that ventilation is ineffective to reduce the maximum response of spherical chambers subjected to internal high explosive explosion.
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Kim, Hanseup, Khalil Najafi, and Luis P. Bernal. "Helmholtz Resonance Based Micro Electrostatic Actuators for Compressible Gas Control: A Microjet Generator and a Gas Micro Pump." Journal of Microelectronics and Electronic Packaging 7, no. 1 (January 1, 2010): 1–9. http://dx.doi.org/10.4071/1551-4897-7.1.1.

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This paper reports Helmholtz-resonance based micro electrostatic actuators to control compressible gaseous fluids in the micro scale. Particularly, it discusses design, fabrication, and testing results of two electrostatic actuators: a micro jet generator and an integrated peristaltic multistage micro pump. These electrostatic actuators vibrate a micro membrane in a micro chamber at a high frequency (&gt;10 kHz), and easily induce the resonant behavior of compressible gases in the chamber. Such resonant behavior, often called the Helmholtz resonance, can repeatedly create instantaneous pressure in equilibrium between the inside and outside of the chamber and cause gas to rapidly exit the chamber, forming a collimated jet. The developed micro jet generator consists of multiple acoustic chambers in parallel; produces directional gas momentum from each chamber by utilizing the Helmholtz resonance; and collectively entrains nearby gas molecules to form a gas stream. The fabricated micro jet generator has a footprint of 1.6 × 1.6 cm2 and contains 25 acoustic micro thrusters. It operates using a 140 V and 70 kHz sinusoidal signal and produces a thrust of 55.6 μN, a maximum air velocity of 1.2 m/s, and consumes power of 3.11 mW. The developed micro pump consists of multiple acoustic chambers in series and produces a high total pressure by accumulating pressures across the multiple chambers, while maintaining high flow rates utilizing the fluidic resonance of each pumping chamber. The fabricated 18-stage pump produces the maximum air flow rate of 4.0 sccm and maximum pressure differentials of 17.5 kPa with total power consumptions of only 57 mW. Its total package volume is 25.1 × 19.1 × 1 mm3. It is notable that these electrostatic actuators, with their actuation membranes, acoustic chambers, fluidic channels, and micro valves, are fabricated into a single silicon chip by developing low temperature wafer bonding techniques to protect the polymer structures inside.
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Dissertations / Theses on the topic "Pressure chamber"

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Williams, Adrian Michael. "Thermal Vacuum Chamber Refurbishment and Analysis." DigitalCommons@CalPoly, 2018. https://digitalcommons.calpoly.edu/theses/1860.

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Spacecraft are subject to different environments while on orbit around the Earth and beyond. One of the most critical of these environments that must be counteracted is the thermal environment. Each spacecraft has an operating temperature that is specified in the mission requirements. The requirement stems from internal component operating temperatures that are critical to mission success. Prior to placing the spacecraft in orbit, engineers must be sure that the spacecraft will survive or risk losing the mission entirely. The primary way to mitigate this risk is to use a thermal vacuum chamber (TVAC). The chamber is designed to resemble a space environment by reducing the pressure within the chamber to 1e-6 Torr. The differentiating factor between a vacuum chamber and a thermal vacuum chamber is the ability for the TVAC to complete a process known as thermal cycling using a temperature controller. Thermal cycling begins at a set temperature and increases within the chamber to a designated hot temperature expected to be seen on orbit. After the maximum temperature is reached, it remains there for a specified amount of time in what is called a soak. The controller then reduces the temperature to a specified cold temperature where a second soak takes place. Finally, the temperature is returned to the initial temperature and the process is repeated for a number of cycles until testing is complete. For the purpose of this thesis, only the initial temperature increase and the first soak are being investigated. The chamber being used to run these experiments was graciously donated by MDA US Systems, however, no additional documentation was provided with the chamber. The Two identical black coated aluminum and brass cylinders have been chosen to be run with three different temperature profiles. The profiles are manually designed in the temperature controller on the chamber and vary by final soak temperature. To supplement the testing, simulations have been created for each test case in order to verify the computer model of the chamber. The simulations utilize AutoCad and Thermal Desktop to provide the results for comparison. Each of the tests were completed successfully and produced good results that corresponded well to the simulation. The largest difference between the simulation cylinder temperature and the experimental cylinder temperature was 1.9 $^{\circ}$C. The effectiveness and efficiency of the blue chamber was compared to the other thermal vacuum chamber in the Space Environments lab. Overall, the Blue Chamber proved to be more robust and much easier to operate than the HVEC thermal vacuum chamber.
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Brown, P., J. Silvertooth, and J. Malcuit. "Evaluation of the Pressure Chamber for Timing Early Season Irrigations." College of Agriculture, University of Arizona (Tucson, AZ), 1993. http://hdl.handle.net/10150/209564.

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Use of the pressure chamber to time the initial post- planting irrigation of short season upland cotton was evaluated in a pilot study at Marana during 1992. Top yields and better overall plant performance were obtained when the initial post - planting irrigation was applied before leaf xylem potential (ψx) dropped significantly below -15 bars. Our findings were similar to those previously observed with Acala cotton in California. The authors believe more work is required before use of the pressure chamber is recommended for irrigation management in Arizona. Specifically, an effective means of separating changes in ψx resulting from day-to-day climate fluctuations from those caused by soil-water depletion must be developed. This study also clearly showed the importance of avoiding early season water stress when growing short season cotton.
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Zhong, Chong. "Pressure Chamber Experiments to Determine Triaxial Material Properties of Polymer Foams." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1556265641540063.

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McGlashan, Niall Ross. "Design and testing of a high pressure chamber for diesel spray studies." Thesis, Imperial College London, 1997. http://hdl.handle.net/10044/1/7174.

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Ravi, Vinay. "Effect of nonlinear chamber compliance and pumping areas on the dynamic stiffness and chamber pressure of a hydraulic body mount." The Ohio State University, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=osu1532032639331273.

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Pal, Aniruddha. "Experimental and Numerical Study of Dual-Chamber Thermosyphon." Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/16251.

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An experimental and numerical investigation was conducted to study boiling and condensation - the two most important phenomena occurring in a dual-chamber thermosyphon. Boiling experiments were carried out using water at sub-atmospheric pressures of 9.7, 15 and 21 kPa with a three-dimensional porous boiling enhancement structure integrated in the evaporator. Sub-atmospheric pressure boiling achieved heat fluxes in excess of 100 W/cm2 with negligible incipience superheat, for wall temperatures below 85 oC. Reduced pressures resulted in reduction of heat transfer coefficient with decrease in saturation pressure. The boiling enhancement structure showed considerable heat transfer enhancement compared to boiling from plain surface. Increased height of the structure decreased the heat transfer coefficient and suggested the existence of an optimum structure height for a particular saturation pressure. A parametric study showed that a reduction in liquid level of water increased the CHF for boiling with plain surfaces. For boiling with enhanced structures, the liquid level for optimum heat transfer increased with increasing height of the enhanced structure. A numerical model was developed to study condensation of water in horizontal rectangular microchannels of hydraulic diameters 150-375 µm. The model incorporated surface tension, axial pressure gradient, liquid film curvature, liquid film thermal resistance, gravity and interfacial shear stress, and implemented successive solution of mass, momentum and energy balance equations for both liquid and vapor phases. Rectangular microchannels achieved significantly higher heat transfer coefficient compared to a circular channel of similar hydraulic diameter. Increasing the inlet mass flow rate resulted in a higher heat transfer coefficient. Increasing the inlet temperature difference between wall and vapor led to a thicker film and a gradually decreasing heat transfer coefficient. Increasing the channel dimensions led to higher heat transfer coefficient, with a reduction in the vapor pressure drop along the axial direction of the channel. The unique contributions of the study are: extending the knowledge base and contributing unique results on the thermal performance of thermosyphons, and development of a analytical model of condensation in rectangular microchannels, which identified the system parameters that affects the flow and thermal performance during condensation.
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Choi, Yong Seok. "Diesel spray characterisation in a high pressure chamber and in a single-cylinder engine." Thesis, Imperial College London, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.393885.

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Mishra, Neeraj Kumar Ratner Albert. "Effect of chamber pressure on liquid drop impacts on a stationary smooth and dry surface." [Iowa City, Iowa] : University of Iowa, 2009. http://ir.uiowa.edu/etd/408.

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Junaideen, Sainulabdeen Mohamed. "The design and performance of a pressure chamber for testing soil nails in loose fill." Thesis, Hong Kong : University of Hong Kong, 2001. http://sunzi.lib.hku.hk/hkuto/record.jsp?B23273331.

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Mishra, Neeraj Kumar. "Effect of chamber pressure on liquid drop impacts on a stationary smooth and dry surface." Thesis, University of Iowa, 2009. https://ir.uiowa.edu/etd/408.

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Impact of drops on a dry smooth surface was studied at elevated chamber pressures and low Reynold's numbers to characterize the effect of chamber pressure on drop splashing and spreading. Two drop sizes of methanol, ethanol, propanol, hexadecane and diesel were tested for impact speeds between 1.5 - 3.3 m/s and pressure of upto 12 bars. Splash ratio, unlike the results of Xu et al, increased sharply with decreasing impact speed suggesting that drop speed is a more critical parameter for splash. Drop splashing was also found to be affected by drop shape, with drop distortion having a significant impact on splash promotion or suppression. In accordance with existing theory, drop spreading and maximum spread factor were found to be independent of pressure in the regime tested. These observations provide new insights and comparison data for evaluating and modeling the behavior of alternate fuels like ethanol.
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Books on the topic "Pressure chamber"

1

George C. Marshall Space Flight Center., ed. Pressure fed thrust chamber technology: Test plan. Sacramento, Calif: Aerojet Propulsion Division, 1990.

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Schins, H. Shock tubes: Compressions in the low pressure chamber. Luxembourg: Commission of the European Communities, 1986.

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United States. National Aeronautics and Space Administration., ed. Stigmatically focusing partial pressure analyzer with dual chamber ion source. Washington, DC: National Aeronautics and Space Administration, 1987.

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United States. National Aeronautics and Space Administration., ed. Pressure fed thrust chamber technology program: Contract NAS 8-37365, final report. [Washington, DC: National Aeronautics and Space Administration, 1992.

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Laura, Salamacha, and Ames Research Center, eds. Lower body negative pressure chamber: Design and specifications for tilt-table mounting. Moffett Field, Calif: National Aeronautics and Space Administration, Ames Research Center, 1995.

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Jankovsky, Robert S. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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D, Smith Timothy, Pavli Albert J, and NASA Glenn Research Center, eds. High-area-ratio rocket nozzle at high combustion chamber pressure--experimental and analytical validation. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 1999.

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Kumakawa, Akinaga. Characteristics of heat transfer to nickel plated chamber walls of high pressure rocket combustors. Tokyo: National Aerospace Laboratory, 1991.

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Book chapters on the topic "Pressure chamber"

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Hou, Ruowu, and Ningli Wang. "The Optic Nerve Chamber Syndrome." In Intraocular and Intracranial Pressure Gradient in Glaucoma, 167–71. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-2137-5_22.

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Wolański, Piotr, Piotr Kalina, Włodzimierz Balicki, Artur Rowiński, Witold Perkowski, Michał Kawalec, and Borys Łukasik. "Development of Gasturbine with Detonation Chamber." In Shock Wave and High Pressure Phenomena, 23–37. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68906-7_2.

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Wang, Baiquan, Hongda Zhang, Dawei Li, and Fengguo Li. "Chamber Opening Under Pressure Technology of Shield." In Key Technologies for Tunnel Construction under Complex Geological and Environmental Conditions, 319–46. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1383-8_6.

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Kasahara, Jiro, Yuichi Kato, Kazuaki Ishihara, Keisuke Goto, Ken Matsuoka, Akiko Matsuo, Ikkoh Funaki, et al. "Application of Detonation Waves to Rocket Engine Chamber." In Shock Wave and High Pressure Phenomena, 61–76. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68906-7_4.

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Cuda, Anthony. "The Poet and the Pressure Chamber: Eliot's Life." In A Companion to T. S. Eliot, 1–14. Chichester, UK: John Wiley & Sons, Ltd, 2011. http://dx.doi.org/10.1002/9781444315738.ch1.

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Qu, Fuzheng, Li Wu, and Wei Sun. "Analysis of Chamber Pressure for Earth Pressure Balance Shield Machine by Discrete Numerical Model." In Intelligent Robotics and Applications, 402–11. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-642-10817-4_40.

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Jiang, Haibo, and Xiangdong Zhao. "Analysis on Pressure-Falling Phenomenon Caused by Air Chamber in Pressured Water Supply Pipe." In Advances in Water Resources and Hydraulic Engineering, 2129–33. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-89465-0_365.

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Seitz, Timo, Ansgar Lechtenberg, and Peter Gerlinger. "Rocket Combustion Chamber Simulations Using High-Order Methods." In Notes on Numerical Fluid Mechanics and Multidisciplinary Design, 381–94. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-53847-7_24.

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Abstract High-order spatial discretizations significantly improve the accuracy of flow simulations. In this work, a multi-dimensional limiting process with low diffusion (MLP$$^\text {ld}$$) and up to fifth order accuracy is employed. The advantage of MLP is that all surrounding volumes of a specific volume may be used to obtain cell interface values. This prevents oscillations at oblique discontinuities and improves convergence. This numerical scheme is utilized to investigate three different rocket combustors, namely a seven injector methane/oxygen combustion chamber, the widely simulated PennState preburner combustor and a single injector chamber called BKC, where pressure oscillations are important.
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Oda, Teiji, Alfonso-Tadaomi Miyamoto, Yoshifumi Okamoto, and Toshihiko Ban. "Dual Chamber Skeletal Muscle-Powered Pump: Performance at Low Filling Pressure." In Heart Replacement, 335–38. Tokyo: Springer Japan, 1993. http://dx.doi.org/10.1007/978-4-431-67023-0_48.

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Mondal, Suryanarayan, V. M. Datar, S. D. Kalmani, G. Majumder, N. K. Mondal, and B. Satyanarayana. "Estimation of Leak of a Resistive Plate Chamber by Monitoring Absolute Pressure." In XXII DAE High Energy Physics Symposium, 851–53. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-73171-1_207.

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Conference papers on the topic "Pressure chamber"

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Seidt, Jeremy D., and B. Dale Trott. "Design of a Blast Chamber for Repeated Use." In ASME 2005 Pressure Vessels and Piping Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/pvp2005-71085.

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The simplest spherical steel blast containment chamber comprises a spherical shell with a single access port large enough to provide the access required by the application to the interior of the chamber. For small chambers, the access port may approach the radius of the chamber. Such a relatively large port requires a heavy reinforcing ring structure to avoid stress concentrations around the port. The eccentricity caused by the port reinforcement leads to undesirably large localized bending mode stresses following a blast containment event. These stresses can exceed the first-cycle fundamental response to the blast load by a factor greater than two. This paper describes the development of a finite element program to analyze the occurrence of these complex oscillations. This quick-running program provides a means to evaluate design modifications to control unwanted oscillations. This approach leads to the development of safe cost-effective blast containment chamber designs.
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Fukuoka, Hiroshi, Minoru Yaga, and Toshio Takiya. "Small High-Pressure Chamber Shock Tube." In ASME 2012 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/pvp2012-78461.

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The unsteady supersonic jet formed by the shock tube with small high-pressure section was used as a simple alternative system of pulsed laser ablation. The dynamic of the supersonic jet impinging upon a flat plate are discussed by comparing experimental and calculated results. The experiment and numerical calculation were carried out by schlieren method and by solving the axisymmetric two-dimensional compressible Navier-Stokes equations, respectively. The main parameters are distance between the open end of the shock tube and the flat plate, L/D, and the pressure ratio of the shock tube, Ph/Pb. Where, L, D, Ph and Pb are the distance between the open end of the shock tube and the flat plate, the diameter of the shock tube, pressure of the high and low section of the shock tube, respectively. Collision between the shock wave reflected at the flat plate and the head of supersonic jet takes place. Computational results well predict the experimental dynamic behavior of the shock wave and the supersonic jet. Marked increase in the static pressure on the flat plate under high Ph/Pb and short L/D is observed due to interaction between the shock wave and the unsteady jet flow.
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Tribble, Megan K., and Jerome H. Stofleth. "Evaluation of the Transportable Detonation Chamber for Processing Recovered Munitions." In ASME 2019 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/pvp2019-93296.

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Abstract Sandia National Laboratories was tasked by the United States Army Recovered Chemical Materiel Directorate with evaluating the fitness of the Transportable Detonation Chamber for use in demilitarization of chemical munitions. The chamber was instrumented with strain, pressure, and acceleration sensors to study its behavior during explosive tests ranging from 1.25 to 20 lb of explosive charge weight. The structural response of the chamber and techniques recommended by the manufacturer — use of water bags and sand-filled walls — were assessed. Through this testing, it was found that the two techniques did not significantly affect the chamber’s response. It was also discovered that the structural integrity of the chamber (and, therefore, its suitability for use with chemical agents) was compromised, as some welds failed. Sandia does not recommend using this vessel for chemical munition demilitarization. This chamber is suitable, however, for demilitarization of conventional munitions, in which fragments and overpressure are the primary concern.
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King, Kim W., and Johnny H. Waclawczyk. "Blast Containment Chamber Development and Testing." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93028.

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Explosive containment chambers are produced for a number of purposes. Some chambers are designed to protect personnel from a single accidental explosion, such as storage in a manufacturing process. Other chambers are designed for multiple intended detonations such as a chamber used for explosive research and testing. Several bomb containment vessels are produced that are used for explosives storage and transportation, as well as the destruction of conventional and chemical-biological improvised explosive devices (IED). Multiple spherical vessels exist that are rated for multiple detonations of explosives that range from 10-lbs TNT equivalent to more than 25-lbs TNT in what would be considered a venting mode of operation. Additionally, there are similar chambers designed to limit the risk of exposure to hazardous materials during the transportation and destruction of an IED that has an associated chemical or biological hazard. The charge rating for these chambers is typically less due to the nature of the threat. A new type of bomb containment vessel has emerged to contain the effects of a device found in luggage or smaller shipping packages. These chambers are typically intended to contain IEDs that do not have an associated chemical or biological hazard. Often times these units do not have the preferred geometrical shape of a sphere because of use and spatial restrictions. Additionally, these units are designed for a single detonation of the design charge weight (i.e., it is not reusable). It is expected to undergo severe permanent displacement during an event, but will not rupture. Other explosive containment chambers are used to destroy military munitions. Many of these chambers have survived hundreds or even thousands or detonations. Typically, these chambers are designed using a dynamic non-linear finite element analysis (FEA) during initial design. Following the design phase, these vessels are tested to confirm performance, and (in the case of a sealed chamber) characterize the leakage characteristics. Additionally, the test program is intended to identify and eliminate any physical weaknesses in the system, quantify structural response of the system under various explosive charge weights, and identify operational and maintenance problems. This paper describes the design and testing procedures for these programs and compares them based on similarities and differences.
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Ding, Zhouxiang, Peng Wang, and Siyuan Wang. "Chamber Pressure Optimization for Shield Tunneling." In Transportation Research Congress 2016. Reston, VA: American Society of Civil Engineers, 2018. http://dx.doi.org/10.1061/9780784481240.066.

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Guo, Wei, Leng Wei-Feng, Zhang Jian-Jun, and Zhang Ying. "Design of Chamber Pressure Test System Based on Pressure Bomb." In 2018 International Conference on Sensor Networks and Signal Processing (SNSP). IEEE, 2018. http://dx.doi.org/10.1109/snsp.2018.00047.

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Jiang, Hao, Charlotte Barbier, and Bernie Riemer. "Bifurcation Buckling Analysis and Non-Linear Collapse Analysis of Teardrop Shaped Vacuum Chamber." In ASME 2022 Pressure Vessels & Piping Conference. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/pvp2022-82187.

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Abstract The Spallation Neutron Source (SNS) accelerator is being upgraded to increase the beam power from 1.4MW at 1GeV to 2.8MW at 1.3GeV. The currents in the middle two injection chicane magnets cannot simply be scaled up to accommodate the increased injection energy of 1.3GeV due to potential excessive H− stripping; the magnets must be replaced with longer, lower-field magnets and the associated vacuum chambers need to be redesigned. A new teardrop-shaped vacuum chamber was initially designed to accommodate the new magnets and the updated beam paths and instrumentation. This paper focuses on the structural stability study of the teardrop shape vacuum chamber based on buckling analysis. Protection against collapse from buckling according to the ASME BPVC requirement has been evaluated in depth. First, a Type-1 bifurcation buckling analysis using a linear eigenvalue solution to determine the critical load factor was performed. Subsequently, a Type-3 nonlinear collapse analysis was conducted using the static Riks method with elastic-plastic material properties and imperfections explicitly considered in the model geometry. The critical buckling load for the teardrop shape vacuum chamber was confidently estimated based upon this two-stage approach.
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Takashima, Yasuhito, Mitsuru Ohata, Tetsuya Tagawa, Bart Simoens, Michel H. Lefebvre, Robert E. Nickell, Kenji Koide, et al. "Damage Caused by Dynamic/Cyclic Loading of Detonation Chamber." In ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-57313.

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The plastic damage caused by multiple dynamic loading and its influence on the ductility and toughness of 3.5%Ni-steel (SA203E) and C-steel (SA516M) were examined for the discussion of integrity design of detonation chambers. V-notched specimens and hourglass specimens were welded on 1/7-scale model of a 1-ton explosive class detonation chamber and subjected to 30 detonation shots. It has been indicated that 30 detonation shots caused pre-strain in the specimens. The ductility was reduced by the pre-strain. The Charpy impact toughness was affected as well in a lower temperature. It has been noted that the damage is developed with fatigue crack growth at notch root of the V-notched specimen.
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Itoh, Takahide, and Makoto Fujitani. "Pressure Pulsation of Scroll Compressor." In ASME 1997 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/imece1997-1022.

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Abstract Pressure pulsation in the scroll compressor was analyzed with three dimensional FLIC (flow in cell) method which was a kind of finite volume method. In advance of analyses, the grid generation method for numerical analysis was established in the scroll compression chamber. According to compression progress, grids in compression chambers are transformed and each conservation quantity which transport through the grid boundary was adjusted by moving boundary velocity. The overset grid was used between compression chamber and discharge port. In the overset grids, grids nodes of the discharge port are not located in same points of the compression chamber grid nodes. In this case the conservation quantity on the boundary is interpolated between every adjacent grids. However, we simplified interpolation with treating the discharge port as one grid. Using this program, it is possible to predict the suction pressure pulsation, the compression pressure pulsation and the discharge pressure pulsation in the scroll. Finally the supercharging construction using the suction pressure pulsation was developed and it is confirmed the supercharging effect of the suction path shape and the suction path length experimentally.
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Simoens, B., M. H. Lefebvre, J. K. Asahina, F. Minami, and R. E. Nickell. "Analysis of the Dynamic Response of a Controlled Detonation Chamber." In ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25592.

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Detonation chambers (either mobile or fixed) are used worldwide for a wide range of applications. At present, a 1/7 scale model of a 1 ton detonation chamber is available for extended testing in Belgium. The chamber is a single wall cylindrical vessel with semi-elliptical ends. Each time an explosive charge is fired in the vessel, that vessel is submitted to a number of deformation cycles. A series of strain gages measure the deformation of the vessel walls. Experimental peak strains and vibration frequency can be compared to predicted values based on simple formulas. Measured values are reasonably close to the estimated values. The influence of the shape of the charge is studied. The shape has an important influence on the chamber response. For a fixed charge mass, a spherical charge causes less deformation than a cylindrical charge and is therefore advantageous from a fatigue point of view.
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Reports on the topic "Pressure chamber"

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Glushko, E. Ya, and A. N. Stepanyuk. Optopneumatic medium for precise indication of pressure over time inside the fluid flow. Астропринт, 2018. http://dx.doi.org/10.31812/123456789/2874.

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In this work, a gas-filled 1D elastic pneumatic photonic crystal is proposed as an optical indicator of pressure which can unite several pressure scales of magnitude. The indicator includes layered elastic platform, optical fibers and switching valves, all enclosed into a chamber. We have investigated the pneumatic photonic crystal bandgap structure and light reflection changes under external pressure. At the chosen parameters the device may cover the pressure interval (0, 10) bar with extremely high accuracy (1 μbar) for actual pressures existing inside the biofluid systems of biological organisms. The size of the indicator is close to 1 mm and may be decreased. The miniaturized optical devices considered may offer an opportunity to organize simultaneous and total scanning monitoring of biofluid pressure in different parts of the circulatory systems.
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Lin, J., and D. C. Badders. Pressure Loads by Gas in an Enclosed Chamber in DYNA3D. Office of Scientific and Technical Information (OSTI), August 2002. http://dx.doi.org/10.2172/15013466.

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Mc Bratney, W. F., and J. A. Vanderhoff. High Pressure Windowed Chamber Burned Rate Determination of Liquid Propellant XM46. Fort Belvoir, VA: Defense Technical Information Center, June 1994. http://dx.doi.org/10.21236/ada283770.

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Ikeda, Takeshi, Takeshi Nakajima, Daisuke Kawai, and Yoji Fukami. Improvement of transitional characteristic by measuring pressure in the combustion chamber. Warrendale, PA: SAE International, October 2005. http://dx.doi.org/10.4271/2005-32-0050.

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Glushko, E. Ya, and A. N. Stepanyuk. Pneumatic photonic crystals: properties and application in sensing and metrology. [б. в.], 2018. http://dx.doi.org/10.31812/123456789/2875.

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A pneumatic photonic crystal i.e. a medium containing regularly distributed gas-filled voids divided by elastic walls is proposed as an optical indicator of pressure and temperature. The indicator includes layered elastic platform, optical fibers and switching valves, all enclosed into a chamber. We have investigated theoretically distribution of deformation and pressure inside a pneumatic photonic crystal, its bandgap structure and light reflection changes depending on external pressure and temperature.
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Siekhaus, W. J. Surface Adsorption with Infinite, or Finite, Residence Time, and the Resultant Pressure Decrease in a Reaction Chamber. Office of Scientific and Technical Information (OSTI), January 2019. http://dx.doi.org/10.2172/1491965.

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Gentile, C. A., W. R. Blanchard, T. A. Kozub, M. Aristova, C. McGahan, S. Natta, K. Pagdon, and J. Zelenty. A Concept for a Low Pressure Noble Gas Fill Intervention in the IFE Fusion Test Facility (FTF) Target Chamber. Office of Scientific and Technical Information (OSTI), January 2010. http://dx.doi.org/10.2172/971199.

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Shykoff, B. Pulmonary Effects of Six-Hour Dives: In-Water or Dry Chamber Exposure to an Oxygen Partial Pressure of 1.6 ATM. Fort Belvoir, VA: Defense Technical Information Center, October 2005. http://dx.doi.org/10.21236/ada443182.

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Hseuh H. C. PRESSURE DISTRIBUTION ALONG THE AGS VACUUM CHAMBERS. Office of Scientific and Technical Information (OSTI), January 1987. http://dx.doi.org/10.2172/1151182.

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Delwiche, Michael, Boaz Zion, Robert BonDurant, Judith Rishpon, Ephraim Maltz, and Miriam Rosenberg. Biosensors for On-Line Measurement of Reproductive Hormones and Milk Proteins to Improve Dairy Herd Management. United States Department of Agriculture, February 2001. http://dx.doi.org/10.32747/2001.7573998.bard.

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The original objectives of this research project were to: (1) develop immunoassays, photometric sensors, and electrochemical sensors for real-time measurement of progesterone and estradiol in milk, (2) develop biosensors for measurement of caseins in milk, and (3) integrate and adapt these sensor technologies to create an automated electronic sensing system for operation in dairy parlors during milking. The overall direction of research was not changed, although the work was expanded to include other milk components such as urea and lactose. A second generation biosensor for on-line measurement of bovine progesterone was designed and tested. Anti-progesterone antibody was coated on small disks of nitrocellulose membrane, which were inserted in the reaction chamber prior to testing, and a real-time assay was developed. The biosensor was designed using micropumps and valves under computer control, and assayed fluid volumes on the order of 1 ml. An automated sampler was designed to draw a test volume of milk from the long milk tube using a 4-way pinch valve. The system could execute a measurement cycle in about 10 min. Progesterone could be measured at concentrations low enough to distinguish luteal-phase from follicular-phase cows. The potential of the sensor to detect actual ovulatory events was compared with standard methods of estrus detection, including human observation and an activity monitor. The biosensor correctly identified all ovulatory events during its testperiod, but the variability at low progesterone concentrations triggered some false positives. Direct on-line measurement and intelligent interpretation of reproductive hormone profiles offers the potential for substantial improvement in reproductive management. A simple potentiometric method for measurement of milk protein was developed and tested. The method was based on the fact that proteins bind iodine. When proteins are added to a solution of the redox couple iodine/iodide (I-I2), the concentration of free iodine is changed and, as a consequence, the potential between two electrodes immersed in the solution is changed. The method worked well with analytical casein solutions and accurately measured concentrations of analytical caseins added to fresh milk. When tested with actual milk samples, the correlation between the sensor readings and the reference lab results (of both total proteins and casein content) was inferior to that of analytical casein. A number of different technologies were explored for the analysis of milk urea, and a manometric technique was selected for the final design. In the new sensor, urea in the sample was hydrolyzed to ammonium and carbonate by the enzyme urease, and subsequent shaking of the sample with citric acid in a sealed cell allowed urea to be estimated as a change in partial pressure of carbon dioxide. The pressure change in the cell was measured with a miniature piezoresistive pressure sensor, and effects of background dissolved gases and vapor pressures were corrected for by repeating the measurement of pressure developed in the sample without the addition of urease. Results were accurate in the physiological range of milk, the assay was faster than the typical milking period, and no toxic reagents were required. A sampling device was designed and built to passively draw milk from the long milk tube in the parlor. An electrochemical sensor for lactose was developed starting with a three-cascaded-enzyme sensor, evolving into two enzymes and CO2[Fe (CN)6] as a mediator, and then into a microflow injection system using poly-osmium modified screen-printed electrodes. The sensor was designed to serve multiple milking positions, using a manifold valve, a sampling valve, and two pumps. Disposable screen-printed electrodes with enzymatic membranes were used. The sensor was optimized for electrode coating components, flow rate, pH, and sample size, and the results correlated well (r2= 0.967) with known lactose concentrations.
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