Research on the Parallel Arrangement of Aragonite Sheets in Clam's Shell

2005 ◽  
pp. 673-676
Author(s):  
Bin Chen ◽  
Xiang He Peng ◽  
Jing Hong Fan
Keyword(s):  
Parallel Arrangement

Comparison of the performance of oscillating water column devices based on arrangements of water columns

2020 ◽  
Vol 14 (3) ◽  
pp. 7082-7093
Author(s):  
Jahirwan Ut Jasron ◽  
Sudjito Soeparmani ◽  
Lilis Yuliati ◽  
Djarot B. Darmadi
Keyword(s):  
Wave Propagation ◽  
Water Column ◽  
Water Depth ◽  
Graphical Form ◽  
Wave Power ◽  
Oscillating Water Column ◽  
Power Absorption ◽  
Water Columns ◽  
Single Column ◽  
Parallel Arrangement

The hydrodynamic performance of oscillating water column (OWC) depends on the depth of the water, the size of the water column and its arrangement, which affects the oscillation of the water surface in the column. An experimental method was conducted by testing 4 water depths with wave periods of 1-3 s. All data recorded by the sensor is then processed and presented in graphical form. The research focused on analyzing the difference in wave power absorption capabilities of the three geometric types of OWC based on arrangements of water columns. The OWC devices designed as single water column, the double water column in a series arrangement which was perpendicular to the direction of wave propagation, and double water column in which the arrangement of columns was parallel to the direction of wave propagation. This paper discussed several factors affecting the amount of power absorbed by the device. The factors are the ratio of water depth in its relation to wavelength (kh) and the inlet openings ratio (c/h) of the devices. The test results show that if the water depth increases in the range of kh 0.7 to 0.9, then the performance of the double chamber oscillating water column (DCOWC) device is better than the single chamber oscillating water column (SCOWC) device with maximum efficiency for the parallel arrangement 22,4%, series arrangement 20.8% and single column 20.7%. However, when referring to c/h, the maximum energy absorption efficiency for a single column is 27.7%, double column series arrangement is 23.2%, and double column parallel arrangement is 29.5%. Based on the results of the analysis, DCOWC devices in parallel arrangement showed the ability to absorb better wave power in a broader range of wave frequencies. The best wave of power absorption in the three testing models occurred in the wave period T = 1.3 seconds.

scholarly journals A Region of the Myosin Rod Important for Interaction With Paramyosin in Caenorhabditis elegans Striated Muscle

Genetics ◽  
2000 ◽  
Vol 156 (2) ◽  
pp. 631-643
Author(s):  
Pamela E Hoppe ◽  
Robert H Waterston
Keyword(s):  
Caenorhabditis Elegans ◽  
Heavy Chain ◽  
Molecular Interaction ◽  
Striated Muscle ◽  
Genetic Interaction ◽  
Specific Interaction ◽  
Thick Filament ◽  
Parallel Arrangement ◽  
Myosin Rod

Abstract The precise arrangement of molecules within the thick filament, as well as the mechanisms by which this arrangement is specified, remains unclear. In this article, we have exploited a unique genetic interaction between one isoform of myosin heavy chain (MHC) and paramyosin in Caenorhabditis elegans to probe the molecular interaction between MHC and paramyosin in vivo. Using chimeric myosin constructs, we have defined a 322-residue region of the MHC A rod critical for suppression of the structural and motility defects associated with the unc-15(e73) allele. Chimeric constructs lacking this region of MHC A either fail to suppress, or act as dominant enhancers of, the e73 phenotype. Although the 322-residue region is required for suppression activity, our data suggest that sequences along the length of the rod also play a role in the isoform-specific interaction between MHC A and paramyosin. Our genetic and cell biological analyses of construct behavior suggest that the 322-residue region of MHC A is important for thick filament stability. We present a model in which this region mediates an avid interaction between MHC A and paramyosin in parallel arrangement in formation of the filament arms.

scholarly journals Removal of Pb, Cu, Cd, and Zn Present in Aqueous Solution Using Coupled Electrocoagulation-Phytoremediation Treatment

2017 ◽  
Vol 2017 ◽  
pp. 1-11 ◽  
Author(s):  
Francisco Ferniza-García ◽  
Araceli Amaya-Chávez ◽  
Gabriela Roa-Morales ◽  
Carlos E. Barrera-Díaz
Keyword(s):  
Aqueous Solution ◽  
Current Density ◽  
Batch Reactor ◽  
Operating Time ◽  
Typha Latifolia ◽  
Optimal Conditions ◽  
Lead And Zinc ◽  
Parallel Arrangement ◽  
Aluminum Electrodes ◽  
Cadmium Lead

This study presents the results of a coupled electrocoagulation-phytoremediation treatment for the reduction of copper, cadmium, lead, and zinc, present in aqueous solution. The electrocoagulation was carried out in a batch reactor using aluminum electrodes in parallel arrangement; the optimal conditions were current density of 8 mA/cm2 and operating time of 180 minutes. For phytoremediation the macrophytes, Typha latifolia L., were used during seven days of treatment. The results indicated that the coupled treatment reduced metal concentrations by 99.2% Cu, 81.3% Cd, and 99.4% Pb, while Zn increased due to the natural concentrations of the plant used.

Externally pressurized gas bearings in a mixed configuration

2002 ◽  
Vol 216 (2) ◽  
pp. 181-189
Author(s):  
A Cazan ◽  
R Gohar ◽  
M M A Safa
Keyword(s):  
Full Length ◽  
The Other ◽  
Gas Bearings ◽  
High Stiffness ◽  
Parallel Arrangement ◽  
Gas Bearing

This paper analyses the stabilityof an externally pressurized gas bearing (EPB) in a series-parallel arrangement. This mixed con. guration is an alternative to the rigidly mounted single bearing with no external damping, yielding, as one extreme, a high stiffness, but a low whirl threshold speed. The other extreme is a series bearing arrangement with a full-length externally pressurized sleeve between the journal and the housing, yielding a lower stiffness but a higher whirl threshold speed. The paper shows that a mixed con. guration allows for an increase in whirl threshold speed above that for an equivalent rigidly mounted single bearing but below that for a series arrangement. However, the mixed con. guration is stiffer than the series arrangement.

A First Assessment of an Aerodynamic Barrier Layer for Filtering Airborne Hygroscopic Particles

2021 ◽  
Author(s):  
Francisco Arias ◽  
Salvador De Las Heras
Keyword(s):  
Barrier Layer ◽  
Geometrical Model ◽  
Airborne Particles ◽  
Equivalent Diameter ◽  
Infected Person ◽  
Water Droplets ◽  
Small Water ◽  
Parallel Arrangement ◽  
Novel Strategy ◽  
Hygroscopic Particles

Abstract In this work consideration is given to an aerodynamic concept for filtration of small water droplets such as those caused by an infected person when coughs or sneezes and including airborne hygroscopic particle, and with particular application to medical masks. Nowadays, the efficiency of such masks is strongly reduced for airborne particles and increasing the efficiency implies either increasing the thickness of the filtering layers or decreasing the aerodynamic equivalent diameter of the pore, both measures in clear detriment of its breathability. Here, a novel strategy is proposed in which efficiency is increased, not by decreasing the diameter of the pore but actually by increasing the diameter of the water droplet itself. We called this concept as the aerodynamic barrier layer. In this concept a layer with parallel arrangement of micro fibers in the direction of the flow is located just before the traditional filtering layer and being able to promote lift forces which induce clustering, coalescence and growth of water droplets at the center of the aerodynamic channel. The enlarged drop after passing though the aerodynamic barrier layer is now easy captured by a conventional filtering layer. Utilizing a simplified geometrical model, an expression for the required length of the aerodynamic barrier layer was derived.

Effect of series and parallel combination of photovoltaic thermal collectors on the performances of integrated active solar still

2021 ◽  
pp. 1-28
Author(s):  
G N Tiwari ◽  
Md Meraj ◽  
M.E. Khan ◽  
V K Dwevedi
Keyword(s):  
Water Depth ◽  
Electrical Energy ◽  
Solar Still ◽  
Packing Factor ◽  
Pv Module ◽  
Parallel Arrangement ◽  
Passive Solar Still ◽  
In Series ◽  
Parallel Case ◽  
Operating Temperature Range

Abstract In this paper, an analytical expression for hourly yield, electrical energy and overall exergy of self-sustained solar still integrated with series and parallel combination of photovoltaic thermal-compound parabolic concentrator (PVT-CPC) collectors have been derived. Based on numerical computations, it has been observed that the yield is maximum for all self-sustained PVT-CPC collectors are connected in series [case (i)]. Further, the daily yield and exergy increase with the increase of water depth unlike passive solar still for all collectors connected in series. However, overall exergy decreases with an increase of water depth for all collectors connected in parallel [case (iv)]. For numerical simulations, the total numbers of self-sustained PVT-CPC collectors has been considered as constant. Further, an effect of series and parallel combination of PVT-CPC collectors on daily yield, electrical energy and overall exergy have also been carried out. Following additional conclusions have also been drawn: (i) The daily yield of the proposed active solar still decreases with the increase of packing factor of semi-transparent PV module for a given water depth and electrical energy and overall exergy increase with water depth for case (i) as expected due to low operating temperature range at higher water depth in the basin. (i) The daily yield, electrical energy and overall exergy increase with the increase of water depth for all combination of series and parallel arrangement of PVT-CPC collectors for a packing factor of 0.22 as per our expectation.

A New CRONE Suspension: More Compact and More Efficient: Part 2—Synthesis and Achievement

2009 ◽  
Author(s):  
Audrey Rizzo ◽  
Xavier Moreau ◽  
Alain Oustaloup ◽  
Vincent Hernette
Keyword(s):  
Transfer Function ◽  
Fractional Derivative ◽  
Vibration Isolation ◽  
Suspension System ◽  
Technological Parameters ◽  
Stability Degree ◽  
Parallel Arrangement ◽  
The Stability ◽  
Crone Suspension ◽  
The Ideal

In a vibration isolation context, fractional derivative can be used to design suspensions which allow to obtain similar performances in spite of parameters uncertainties. This paper presents the synthesis and the achievement of a new Hydractive CRONE suspension system. After the study of the different constraint in suspension in the first paper, the ideal transfer function of the hydractive CRONE suspension is created and simulated in different case. Then a method to determine the technological parameters is proposed. A parallel arrangement of dissipative and capacitive components and a gamma arrangement are compared. They lead to the same unusual performances: the stability degree robustness and the rapidity robustness.

Research on Ranging Method Based on Binocular Stereo Vision

2014 ◽  
Vol 945-949 ◽  
pp. 2075-2081 ◽  
Author(s):  
Xue Zhi Lv ◽  
Mei Ting Wang ◽  
Yong Feng Qi ◽  
Xue Mei Zhao ◽  
Hao Dong
Keyword(s):  
Camera Calibration ◽  
Stereo Vision ◽  
Experimental Platform ◽  
Binocular Stereo Vision ◽  
Parallel Arrangement ◽  
Binocular Stereo ◽  
Contour Boundary ◽  
Measurement Object ◽  
Stereo Calibration ◽  
Left And Right

Binocular stereo vision ranging method taking contour boundary center of measurement object as matching features was investigated. And experimental platform for binocular stereo vision ranging system was built up. The stereo vision ranging system comprised four modules: camera calibration, stereo calibration, stereo rectification and features extraction. Firstly, the intrinsic parameters of single camera were obtained by camera calibration and relative pose of two cameras was obtained by stereo calibration. Then the left and right images were rectified into a frontal parallel arrangement by Bouguet’s method. The edge pixels of contours were detected by image processing. Then the disparity and the distance was calculated taking contour center as matching features. Finally, measurement error analysis was performed to verify the proposed method with good practicability.

INSECT ION HOMEOSTASIS.

1992 ◽  
Vol 172 (1) ◽  
pp. 323-334 ◽  
Author(s):  
W Zeiske
Keyword(s):  
Ion Homeostasis ◽  
Inorganic Ions ◽  
Goblet Cells ◽  
Functional Expression ◽  
Malpighian Tubules ◽  
Cooperative Interaction ◽  
Constant Composition ◽  
Parallel Arrangement ◽  
Graphical Summary ◽  
Ionic Movements

The constant composition of body fluids in insects is maintained by the cooperative interaction of gastrointestinal and urinary tissues. Water follows ionic movements, which are driven by the basolateral Na+/K+-ATPase and/or the apical 'K+(or Na+) pump'. The latter now is thought to be the functional expression of a parallel arrangement of a proton-motive V-ATPase and a K+(or Na+)/nH+ antiport. This review focuses on the pathways for the movement of monovalent inorganic ions through epithelia involved in ion homeostasis. A graphical summary compares the principal findings with respect to cation secretion in lepidopteran caterpillar midgut goblet cells (K+) and in brush-border cells of Malpighian tubules (K+, Na+).

Litage et divisibilite

1945 ◽  
Vol S5-XV (4-6) ◽  
pp. 161-165
Author(s):  
Paul Maitre
Keyword(s):  
Metamorphic Rocks ◽  
Parallel Arrangement

Abstract Defines bedding, cleavage, and other types of parting planes in metamorphic rocks, noting that cleavage is associated with a fabric in which orientation of the feldspar crystals took place during crystallization and resulted in parallel arrangement of homologous faces, as distinct from schistosity which is the product of mechanical processes.

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