Distribution of the free and oil-trapped air bubbles in simulated broths containing fungal biomass

A device was made for preparing accurate definition of surface, depth and volume of liquid x-ray fluorescence specimens.The apparatus used in conjunction with a specimen holder and plastic film window material accurately and consistently forms a flat bobble-free analysis window on the open face of the specimen holder. The specimen holder in the form of a shallow cylinderical cup is slightly over filled and covered by the plastic film. Placement of the mating leveling apparatus over the film squeezes out trapped air bubbles, levels the exposed face of the specimen, draws the plastic film tightly over the exposed face of the specimen and allows easy installation of a film retaining O-ring to maintain the specimen material in a level state within the holder.

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Why do we build the wall?

Adaptive Behavior ◽

10.1177/1059712319834884 ◽

2019 ◽

Vol 28 (1) ◽

pp. 37-38 ◽

Cited By ~ 1

Author(s):

Ezequiel A Di Paolo

Keyword(s):

Air Bubbles ◽

Trapped Air ◽

Good Move ◽

Autopoietic Theory

I discuss the notion of bodies proposed by Villalobos and Razeto-Barry. I consider it a good move in a direction away from overly formal aspects of autopoietic theory, but in need of refinement. I suggest that because organismic boundaries are dialectical processes and not immanent walls, some autopoietic bodies can extend by incorporating parts of their environment as in the case of insects that use trapped air bubbles to breathe underwater.

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Effects of trapped air bubbles on frequency responses of the piezo-driven inkjet printheads and visualization of the bubbles using synchrotron X-ray

Sensors and Actuators A Physical ◽

10.1016/j.sna.2009.05.021 ◽

2009 ◽

Vol 154 (1) ◽

pp. 132-139 ◽

Cited By ~ 15

Author(s):

Byung-Hun Kim ◽

Tae-Gyun Kim ◽

Tae-Kyung Lee ◽

Sungwook Kim ◽

Seung-Joo Shin ◽

...

Keyword(s):

Air Bubbles ◽

X Ray ◽

Trapped Air ◽

Frequency Responses

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Bubble-Induced Relaxation in High-Pressure Microfluidic Systems

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.562-565.581 ◽

2013 ◽

Vol 562-565 ◽

pp. 581-584

Author(s):

Bao Jun Wang ◽

Fei Xie ◽

Wei Wang ◽

Wen Gang Wu ◽

Zhi Hong Li

Keyword(s):

High Pressure ◽

Flow Resistance ◽

Relaxation Times ◽

Air Bubbles ◽

Microfluidic Systems ◽

Design Guideline ◽

Pressure Relaxation ◽

Air Bubble ◽

Trapped Air

This work reported an analysis of a noticeable relaxation phenomenon caused by undesirable air bubbles in high-pressure microfluidic systems. A model with compression of air bubble considered was established to address the experimental observed pressure relaxation. The results indicated that the dominative factors were flow rate, flow resistance and initial diameter of the trapped air bubble. Meanwhile, the calculated relaxation times in different cases provided a design guideline for high-pressure microfluidic chip to avoid the long-term pressure relaxation.

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Towards orbital dating of the EPICA Dome C ice core using δO<sub>2</sub>/N<sub>2</sub>

Climate of the Past ◽

10.5194/cp-8-191-2012 ◽

2012 ◽

Vol 8 (1) ◽

pp. 191-203 ◽

Cited By ~ 34

Author(s):

A. Landais ◽

G. Dreyfus ◽

E. Capron ◽

K. Pol ◽

M. F. Loutre ◽

...

Keyword(s):

Ice Core ◽

Air Bubbles ◽

Before Present ◽

Data Filtering ◽

Tuning Method ◽

Trapped Air ◽

Measurement Series ◽

Orbital Tuning ◽

Gas Loss ◽

Grain Properties

Abstract. Based on a composite of several measurement series performed on ice samples stored at −25 °C or −50 °C, we present and discuss the first δO2/N2 record of trapped air from the EPICA Dome C (EDC) ice core covering the period between 300 and 800 ka (thousands of years before present). The samples stored at −25 °C show clear gas loss affecting the precision and mean level of the δO2/N2 record. Two different gas loss corrections are proposed to account for this effect, without altering the spectral properties of the original datasets. Although processes at play remain to be fully understood, previous studies have proposed a link between surface insolation, ice grain properties at close-off, and δO2/N2 in air bubbles, from which orbitally tuned chronologies of the Vostok and Dome Fuji ice core records have been derived over the last four climatic cycles. Here, we show that limitations caused by data quality and resolution, data filtering, and uncertainties in the orbital tuning target limit the precision of this tuning method for EDC. Moreover, our extended record includes two periods of low eccentricity. During these intervals (around 400 ka and 750 ka), the matching between δO2/N2 and the different insolation curves is ambiguous because some local insolation maxima cannot be identified in the δO2/N2 record (and vice versa). Recognizing these limitations, we restrict the use of our δO2/N2 record to show that the EDC3 age scale is generally correct within its published uncertainty (6 kyr) over the 300–800 ka period.

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Effect of the Cross-Sectional Shape of Recirculation Channel on Expelling Air Bubbles in the FDBs of HDD Spindle Motors

2014 Conference on Information Storage and Processing Systems ◽

10.1115/isps2014-6933 ◽

2014 ◽

Author(s):

Y. H. Jung ◽

G. H. Jang ◽

C. H. Kang ◽

H. H. Shin ◽

J. Y. Jeong

Keyword(s):

Fluid Dynamic ◽

Hard Disk Drives ◽

Navier Stokes ◽

Air Bubbles ◽

Navier Stokes Equation ◽

Cross Sectional ◽

Air Bubble ◽

Trapped Air ◽

Large Pressure ◽

Fast Flow

Fluid dynamic bearings (FDBs) are applied to most of the spindle motors of computer hard disk drives (HDDs) since FDBs provide better dynamic characteristics, such as lower vibration and noise, than ball bearings. However, a weakness of FBDs is instability arising from air bubbles in the oil lubricant of FDBs. One possible solution to expel the trapped air bubbles out of FDBs is to include recirculation channel (RC). RC is designed to balance the pressures between upper and lower parts of FDBs and to circulate the oil lubricant as well as to expel air bubbles out of FDBs. This paper experimentally and numerically investigates the behavior of the air bubble in oil lubricant of operating FDBs due to the design of the RC. We created the FDBs with transparent cover and performed the experiment to visually observe the behavior of trapped air bubbles. Also, we numerically studied the phenomena of expelling the air bubble. The flow field of FDBs is calculated by the Navier-Stokes equation and the continuity equation. And we numerically explained that large pressure difference between upper and lower regions of RC and fast flow velocity along RC expel the air bubble out of FDBs. This research can be effectively utilized to develop robust FDBs by expelling the air bubbles out of FDBs.

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A review of the brittle ice zone in polar ice cores

Annals of Glaciology ◽

10.3189/2014aog68a023 ◽

2014 ◽

Vol 55 (68) ◽

pp. 72-82 ◽

Cited By ~ 15

Author(s):

Peter D. Neff

Keyword(s):

Atmospheric Pressure ◽

Accumulation Rate ◽

Ice Core ◽

Ice Cores ◽

Snow Accumulation ◽

Air Bubbles ◽

Polar Ice ◽

Overburden Pressure ◽

Trapped Air ◽

Borehole Temperatures

AbstractMaintaining ice-core quality through the brittle ice zone (BIZ) remains challenging for polar ice-core studies. At depth, increasing ice overburden pressurizes trapped air bubbles, causing fracture of cores upon exposure to atmospheric pressure. Fractured ice cores degrade analyses, reducing resolution and causing contamination. BIZ encounters at 18 sites across the Greenland, West and East Antarctic ice sheets are documented. The BIZ begins at a mean depth of 545 ± 162 m (1 standard deviation), extending to depths where ductile clathrate ice is reached: an average of 1132 ± 178 m depth. Ice ages in this zone vary with snow accumulation rate and ice thickness, beginning as young as 2 ka BP at Dye-3, Greenland, affecting ice >160 ka BP in age at Taylor Dome, Antarctica, and compromising up to 90% of retrieved samples at intermediate-depth sites. Effects of pressure and temperature on the BIZ are explored using modeled firn-column overburden pressure and borehole temperatures, revealing complex associations between firn densification and BIZ depth, and qualitatively supporting expected thinning of the BIZ at low ice temperatures due to shallower clathrate stability. Mitigating techniques for drilling, transport, sampling and analysis of brittle ice cores are also discussed.

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Utilization of Waste of Enzymes Biomass as Biosorbent for the Removal of Dyes from Aqueous Solution in Batch and Fluidized Bed Column

Revista de Chimie ◽

10.37358/rc.20.1.7804 ◽

2020 ◽

Vol 71 (1) ◽

pp. 1-12

Author(s):

Salman H. Abbas ◽

Younis M. Younis ◽

Mohammed K. Hussain ◽

Firas Hashim Kamar ◽

Gheorghe Nechifor ◽

...

Keyword(s):

Experimental Data ◽

Aqueous Solution ◽

Particle Size ◽

Adsorption Capacity ◽

Fluidized Bed ◽

Flow Rate ◽

Fungal Biomass ◽

Solution Flow Rate ◽

Maximum Adsorption Capacity ◽

Solution Flow

The biosorption performance of both batch and liquid-solid fluidized bed operations of dead fungal biomass type (Agaricusbisporus ) for removal of methylene blue from aqueous solution was investigated. In batch system, the adsorption capacity and removal efficiency of dead fungal biomass were evaluated. In fluidized bed system, the experiments were conducted to study the effects of important parameters such as particle size (701-1400�m), initial dye concentration(10-100 mg/L), bed depth (5-15 cm) and solution flow rate (5-20 ml/min) on breakthrough curves. In batch method, the experimental data was modeled using several models (Langmuir,Freundlich, Temkin and Dubinin-Radushkviechmodels) to study equilibrium isotherms, the experimental data followed Langmuir model and the results showed that the maximum adsorption capacity obtained was (28.90, 24.15, 21.23 mg/g) at mean particle size (0.786, 0.935, 1.280 mm) respectively. In Fluidized-bed method, the results show that the total ion uptake and the overall capacity will be decreased with increasing flow rate and increased with increasing initial concentrations, bed depth and decreasing particle size.

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