Effect of Intermittent Positive Pressure Application on the Bulk Modulus of the Developing Rabbit Trachea

Respiration ◽  
1981 ◽  
Vol 41 (3) ◽  
pp. 192-198 ◽  
Author(s):  
Vinod K. Bhutani ◽  
Thomas H. Shaffer
Keyword(s):  
Bulk Modulus ◽  
Positive Pressure ◽  
Pressure Application

Study of Time and Temperature Dependency of Bulk Modulus for Molding Compound by Transient Bulk Creep Experiments

2007 ◽  
Author(s):  
M. D. Patel ◽  
K. M. B. Jansen ◽  
L. J. Ernst ◽  
J. Zhou ◽  
C. Bohm
Keyword(s):  
Bulk Modulus ◽  
Negative Pressure ◽  
Positive Pressure ◽  
Pressure Jump ◽  
Temperature Dependency ◽  
Volume Relaxation ◽  
Molding Compound ◽  
Holding Period ◽  
Different Temperatures ◽  
Relaxation Experiments

Transient bulk creep experiments were performed to investigate the time and temperature dependency of the bulk modulus for epoxy molding compound. These, so called pressure jump volume relaxation experiments were done by applying positive and negative pressure jumps followed by a holding period at those pressure levels and the whole set of experiment was repeated at different temperatures. The observations are in the pressure range of 10 to 50 MPa and temperature range of 50 to 150° C. For negative pressure jumps (or expansion experiments) the bulk modulus was found to be almost independent of time. For positive pressure jumps (or compression experiments) time dependent volume decreases very slow. Compared to time and pressure, temperature dependency was of highest influence. A mathematical model has been proposed for the observed temperature and pressure dependency of the bulk modulus.

scholarly journals Vacuum-Actuated Bending for Grasping

Robotics ◽  
2018 ◽  
Vol 7 (4) ◽  
pp. 73
Author(s):  
Jay Miller ◽  
Nathan Wicks
Keyword(s):  
Negative Pressure ◽  
Atmospheric Pressure ◽  
Ambient Pressure ◽  
Positive Pressure ◽  
Cellular Solids ◽  
Pressure Application ◽  
Bending Actuator ◽  
Robotic Devices ◽  
Good Agreement

Soft robotic devices typically are actuated with the application of a positive pressure (compared to ambient pressure), but some exciting work has been done with negative pressure application, with advantages for safety and robustness. Here, we present a negative pressure bending actuator inspired by previous work by Yang et al., fabricated using rapid prototyping techniques and elastomeric polymers. We describe the mechanical behavior of the system from a cellular solids perspective, showing the steps needed for the analysis and characterization of future similar systems. We find good agreement between experimentally measured values of displacement and force generated in atmospheric pressure conditions.

scholarly journals Lower Body Positive Pressure Application with an Antigravity Suit in Acute Carotid Occlusion

2010 ◽  
Vol 2010 ◽  
pp. 1-5 ◽  
Author(s):  
Karine Berthet ◽  
Anne Claire Lukaszewicz ◽  
Marie-Germaine Bousser ◽  
Didier Payen
Keyword(s):  
Potential Risk ◽  
Venous Pressure ◽  
Carotid Occlusion ◽  
Positive Pressure ◽  
Lower Body ◽  
Lower Body Positive Pressure ◽  
Risk Of Bleeding ◽  
Clinical Recovery ◽  
Pressure Application ◽  
Body Positive

The challenge in acute stroke is still to reperfuse as early as possible the ischemic territory. Since fibrinolytic therapies have a limited window with potential risk of bleeding, having a nonpharmacologic mean to recruit vessels in area surrounding necrosis might be useful. We propose here to use antigravity suit inflated at “venous” pressure levels to shift blood towards thoracic and brain territories. We report two cases of spectacular clinical recovery after acute carotid occlusion.

Positive Pressure

2006 ◽  
Vol 31 (11) ◽  
pp. 48-62 ◽  
Author(s):  
James F. Goss ◽  
Jonathan Zygowiec
Keyword(s):  
Positive Pressure

Perancangan Pengkondisian Udara pada Ruangan Steril Rumah Sakit Mitra Medika dengan Standard Cleanroom Menggunakan Instalasi Ducting

2019 ◽  
Vol 2 (2) ◽  
Author(s):  
Fremmy Raymond Agustinus
Keyword(s):  
Air Conditioning ◽  
Static Pressure ◽  
Filter Medium ◽  
Positive Pressure ◽  
Design Tools ◽  
Microsoft Excel ◽  
Cooling Unit ◽  
X 24 ◽  
Air Passage ◽  
Booster Fan

Desain penyejuk udara juga dapat diterapkan di bidang kesehatan, dengan standar Cleanroom dapat diperoleh suhu, kelembaban, kenyamanan dan kebersihan yang dibutuhkan untuk ruang steril (ruang bedah). Perancangan pendingin udara dalam hal ini dilakukan dengan menentukan beban pendinginan yang diperlukan untuk ruang steril (ruang bedah), kemudian menentukan ukuran ducting, jalur ducting, dan jumlah penggunaan ducting. Desain ini menggabungkan unit split saluran yang dimodifikasi, kipas booster, filter pra, filter medium, dan filter HEPA dengan menggunakan saluran aluminium preinsulated sebagai saluran udara. Desain dilakukan dengan menggunakan perangkat lunak AutoCAD 2012, Design Tools Duct Sizer, dan Microsoft Excel. Dari hasil perhitungan dan desain didapatkan kebutuhan kapasitas 3 ruang bedah yaitu ducted ducted 100.000 BTUH sebanyak 3 unit, booster fan 3.3 - 4 Di WG sebanyak 3 unit, pre filter 24 "x 24" x 2 "6 set, filter menengah 610 x 610 x 290 mm 6 set, dan filter HEPA 1220 x 610 x 70 mm 12. Untuk ruang steril, tekanan statis yang dihasilkan oleh unit pendingin harus lebih besar daripada tekanan statis yang dihasilkan dari unit yang ada. di ruang semi steril. Dengan kata lain, ruang steril harus memiliki tekanan positif terhadap ruang semi steril. Hal ini dimaksudkan agar udara di ruang semi steril tidak masuk ke ruang steril ketika pintu antar ruangan dibuka. Desain dan perhitungan ruang bedah, suhu nyata yang diperoleh adalah 23 ° C ± 2 ° C dan kelembaban relatif yang diperoleh adalah 60% ± 2%.   Air conditioning design can also be applied in the health field, with cleanroom standard can be obtained temperature, humidity, comfort and hygiene needed for sterile room (surgical room). The design of air conditioning in this case is done by determining the cooling load required for the sterile room (surgical room), then determining the ducting size, ducting path, and the amount of ducting usage. This design combines modified ducted split unit, booster fan, pre filter, medium filter, and HEPA filter by using preinsulated aluminum duct as an air passage. The design is done by using AutoCAD 2012 software, Design Tools Duct Sizer, and Microsoft Excel. From the calculation and design result obtained the capacity requirement of 3 surgical room that is split ducted 100.000 BTUH as many as 3 units, booster fan 3.3 - 4 In WG as many as 3 units, pre filter 24"x 24" x 2" 6 sets, medium filter 610 x 610 x 290 mm 6 sets, and HEPA filter 1220 x 610 x 70 mm 12 sets. For the sterile room, the static pressure generated by the cooling unit shall be larger than the static pressure generated from the unit present in the semi sterile room. In other words, the sterile room must have positive pressure to the semi sterile room. It is intended that the air in the semi sterile room does not enter into the sterile room when the door between room opened. In this surgical room design and calculation, real temperature obtained is 23 °C ± 2 °C and the relative moisture obtained is 60% ± 2%.

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