MEMS (microelectromechanical systems) for in situ mechanical characterization refers to microfabricated systems (lab-on-a-chip) used to measure the mechanical properties (Youngs modulus, fracture strength) of nanoscale specimens such as nanowires, nanorods, whiskers, nanotubes and thin films. They distinguish themselves from other methods of nanomechanical testing because the sensing and actuation mechanisms are embedded and/or co-fabricated in the microsystem, providing - in the majority of cases- greater sensitivity and precision. This level of integration and miniaturization allows carrying out the mechanical characterization in situ, i.e., testing while observing the evolution of the sample in high magnification instruments such as optical microscopes, scanning electron microscopes (SEM), transmission electron microscopes (TEM) and X-ray setups. Furthermore, analytical capabilities of these instruments such as spectroscopy and diffraction can be used to further characterize the sample, ...
American Water Works Association; James Edzwald: Water Quality & Treatment: A Handbook on Drinking Water, Sixth Edition. GRANULAR MEDIA FILTRATION, Chapter (McGraw-Hill Professional, 2011 1999), AccessEngineering Export ...
Mechanical Characterization and Shape Optimization of Fascicle-Like 3D Skeletal Muscle Tissues Contracted with Electrical and Optical ...
TCT-2 misura la forza di carico e la resistenza a trazione per tutte le tipologie di campione. Il campione viene posizionato sullapposito supporto e la forza/resistenza viene ottenuta spostando gradualmente la cella di carico. La distanza tra il supporto e la colonna verticale è customizzabile. Il campione subirà la forza o la trazione in accord con le specifiche del test impostate. Infine il risultato potrà essere letto direttamente sul diplay oppure stampato. ...
A method of making polymer blend light active particles, comprising the steps of providing a solution comprised of a first organic light active diode material and a second organic light active diode material in a solvent and providing a non-solvent liquid. The method of making polymer blend light active particles also includes the step of adding the solution to the non-solvent liquid to cause a precipitation reaction resulting in multi-layered particles comprising the first and second organic light active diode materials. A method of making a light active electronic device, comprising the steps of providing at least one of organic and inorganic light active particles in a non-solvent liquid; adding a charge transport carrier polymer to the non-solvent liquid to form a fluid carrier/particle mixture; and disposing the mixture between electrodes to form a light active electronic device.
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Toward a mechanical control of drug delivery. On the relationship between Lipinskis 2nd rule and cytosolic pH changes in doxorubicin resistance levels in cancer cells: a comparison to published ...
On Some Aspects of the Thermodynamic of Membrane Recycling Mediated by Fluid Phase Endocytosis: Evaluation of Published Data and ...
Abstract: We experimentally studied the locomotion of the nematode C. elegans in both fluidic and granular media. In this fluid dynamics video, we show the motility gaits of the nematode in these two environments. The motility of the nematode C. elegans is investigated using particle tracking methods. Experimental results show that different transport patterns emerge from the fluidic and granular media during the nematode locomotion ...
The definition of the quadratus lumborum block (QLB) requires a nomenclature discussion. It was first described by Blanco[14] and originally published as the "posterior TAP block" technique. With the evolution of nomenclature, the current description of the QLB1 should be considered deep to the TA aponeurosis while the posterior TAP block is superficial.[15] Additional ultrasound-guided approaches, including the QL2 and QL3 block, have been described in the November 2015 issue of ASRA News.[16] The QL2 block, or injection between the posterior border of the QL muscle and the erector spinae, dissects the plane toward the midline and blocks the ilioinguinal, iliohypogastric, and subcostal nerve fibers. In addition, blocking the sympathetic nerve fibers that cover the thoracolumbar fascia sublayer has theoretical benefit. Future investigation is required for further conclusions regarding the optimal approach.. The QLB is a novel and promising technique and is currently used at both authoring ...
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Open-cell foam structures by beam elements, cf. Gibson and Ashby [26], Onck et al [41], and Schraad and Triantaffylidis [46]. Also granular materials like concrete can be modeled by lattice structures, cf. Schlangen and van Mier [43]. In foams and granular media size effects can be observed which cannot be described by the classical Boltzmann continuum approach but by extended theories like micropolar or micromorphic theories. The Cosserat theory or micropolar theory in turn incorporates additional rotational degrees of freedom for each material point, cf. 2 Honeycomb micromodel (config. 1) with complete set of boundary conditions for shear test. The size dependent boundary layer effect is caused by clamping boundary conditions ϕ = 0 on top and bottom. u1 = u1 u2 = u2 ϕ = ϕ e2 u1 = 0, u2 = 0, ϕ = 0 e1 h From Lattice Models to Extended Continua 23 u2 = 0, ϕ = 0 Fig. 3 Honeycomb micromodel (config. 2) with complete set of boundary conditions for shear test. The size dependent boundary ...
The emergence of collective patterns from repeated local interactions between individuals is a common feature to most living systems, spanning a variety of scales from cells to animals and humans. Subjects of this thesis are two aspects of emergent complexity in living systems: collective movement and transport network formation. For collective movement, this thesis studies the role of movement-mediated information transfer in fish decision-making. The second project on collective movement takes inspiration from granular media and soft mode analysis and develops a new approach to describe the emergence of collective phenomena from physical interactions in extremely dense crowds. As regards transport networks, this thesis proposes a model of network growth to extract simple, biologically plausible rules that reproduce topological properties of empirical ant trail networks. In the second project on transport networks, this thesis starts from the simple rule of "connecting each new node to the ...
A granular media based tunable passive vibration suppressor with self-contained mechanism for the application of static compression N. Boechler, R. P. Dillon, J. P. Borgonia, D. L. Kahn, A. Shapiro, G. L. Davis, C. Daraio, CIT File No.: CIT-5631-P, JPL & NASA Case Number(s): CIT 10-126, NPO 47655. Filed (2010). ...
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The NPL Materials Group has considerable experience in the mechanical characterisation of all classes of materials including metals and alloys, ceramics, polymers, adhesives and composites.
Daza, Rafael and González Bermúdez, Blanca and Cruces, Julia and Fuente del Rey, Mónica de la and Plaza, Gustavo R. and Arroyo Hernández, María and Elices, Manuel and Pérez Rigueiro, José and Guinea, Gustavo V. (2019) Comparison of cell mechanical measurements provided by Atomic ForceMicroscopy (AFM) and Micropipette Aspiration (MPA). Journal of the Mechanical Behavior of Biomedical Materials, 95 . pp. 103-115. ISSN 1878-0180 Daza, Rafael and Cruces González, Julia and Arroyo Hernández, María and Marí-Buyé, Núria and Fuente del Rey, Mónica de la and Plaza, Gustavo R. and Elices, Manuel and Pérez Rigueiro, José and Guinea, Gustavo V. (2015) Topographical and mechanical characterization of living eukaryotic cells on opaque substrates: development of a general procedure and its application to the study of non-adherent lymphocytes. Physical Biology, 12 (2). pp. 1-12. ISSN 1478-3967, ESSN: 1478-3975 ...
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My principle concern with projects of this nature is their innate reliance on the sensational. Our global fascination with emotionally and psychologically hyperbolic imagery, whether in film or photography, lends itself to projects that center around the unveiling of secret spaces. Mind you, I am not critiquing the aesthetic or conceptual validity of the work itself, but rather questioning its dependence on overt visual force. It is easy to assert that issues of social and political importance need to be seen, however the context of their viewing can be extremely subversive. Ultimately, unveiling unseen aspects of culture can bring with it a tremendous amount of power and influence, necessitating all the more tact and sensitivity in the rendering of these issues ...
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Help students gain an understanding of fluid mechanics and strengthen their abilities to analyze this important phenomena encountered by practicing engineers with MECHANICS OF FLUIDS, 5E.
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We have compiled a collection of all the articles on the site since 2006. If you are looking for something in particular you will find it here or you can perform a search or browse by tag.. ...
We have compiled a collection of all the articles on the site since 2006. If you are looking for something in particular you will find it here or you can perform a search or browse by tag.. ...
TY - JOUR. T1 - Voltage-dependent sodium channel function is regulated through membrane mechanics. AU - Shcherbatko, Anatoly. AU - Ono, Fumihito. AU - Mandel, Gail. AU - Brehm, Paul. PY - 1999/10. Y1 - 1999/10. N2 - Cut-open recordings from Xenopus oocytes expressing either nerve (PN1) or skeletal muscle (SkM1) Na+ channel α subunits revealed slow inactivation onset and recovery kinetics of inward current. In contrast, recordings using the macropatch configuration resulted in an immediate negative shift in the voltage-dependence of inactivation and activation, as well as time-dependent shifts in kinetics when compared to cut-open recordings. Specifically, a slow transition from predominantly slow onset and recovery to exclusively fast onset and fast recovery from inactivation occurred. The shift to fast inactivation was accelerated by patch excision and by agents that disrupted microtubule formation. Application of positive pressure to cell-attached macropatch electrodes prevented the shift in ...
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HOW LITIGATION SHAPES THE SCIENTIFIC LITERATURE: ASBESTOS AND DISEASE AMONG AUTOMOBILE MECHANICS David Michaels, Ph.D., M.P.H. & Celeste Monforton, M.P.H. * INTRODUCTION In August 2003, the law firm of
Carton and boxes are widely used in different industries and during the transportation, the cartons and the boxes should bear the compression force and keep intact. Hence before using, the carton should be tested with compression testing instrument.. Labthink introduces the innovative testing instrument, PARAM XYD-15K Box Compression Tester is designed to measure the compressing resistance, shape change and stacking capability of cartons, beehive crates, plastic tanks (for edible oil and mineral water), paper tanks, paper cases and IBC tanks and other packages.. About Labthink:. Labthink, focusing on the laboratory testing instruments R&D and production and laboratory IT services, is dedicated to provide professional quality control solutions for customers in packaging, food, pharmaceutical, medical, daily chemistry, printing, adhesive, automotive, petrochemistry, bioscience, construction, new energy and other industries. Labthink is an international enterprise headquartered in Jinan, China with ...
The phase behavior and phase separation kinetics in polymer solutions in binary mixtures of supercritical carbon dioxide (CO2) and organic solvents were studied for two systems. Solutions of polyethylene (PE) in CO2 + n-pentane were selected as one model system to study both the solid-fluid (S-F) and liquid-liquid (L-L) phase transitions as well as the interplay of these two types of phase separations on the final morphological and thermal properties of PE crystals. Solutions of polysulfone (PSF) in CO2 + tetrahydrofuran (THF) were selected as another model system because of the technological importance of this membrane forming polymer and because of the broad interest in developing new solvent/non-solvent systems for forming microporous materials. These phase boundaries were determined using a high-pressure view-cell and optical techniques over a temperature range of 90-165 oC and pressures up to 55 MPa for PE/n-pentane/CO2 system, and over a temperature range of 25 to 155 oC and pressures up ...
43. A method for forming a generally tubular body having a pseudo-braided pattern, comprising: winding a single, elongate filament having a first end and a second end about a mandrel in a set rotational direction and in a forward axial direction, the filament being wound about the mandrel to form a helical pattern along a desired length of the mandrel; reversing the axial direction of the winding to form a first end reversal at the junction where the filament translates from the forward axial direction to the reverse axial direction; after the first reversal is formed, winding the filament in the same rotational direction about the mandrel in the reverse axial direction in a helical pattern; as the filament is being wound about the mandrel in the reverse axial direction, interlacing the filament in an over/under fashion about the portion of the filament that is already wound about the mandrel; reversing the axial direction of the winding from the reserve axial direction back to the forward axial ...
Microfiltration usually serves as a pre-treatment for other separation processes such as ultrafiltration, and a post-treatment for granular media filtration. The typical particle size used for microfiltration ranges from about 0.1 to 10 μm. In terms of approximate molecular weight these membranes can separate macromolecules generally less than 100,000 g/mol. The filters used in the microfiltration process are specially designed to prevent particles such as, sediment, algae, protozoa or large bacteria from passing through a specially designed filter.. More microscopic, atomic or ionic materials such as water (H2O), monovalent species such as Sodium (Na+) or Chloride (Cl-) ions, dissolved or natural organic matter, and small colloids and viruses will still be able to pass through the filter. Microfiltration usually serves as a pre-treatment for other separation processes such as ultrafiltration, and a post-treatment for granular media filtration. The typical particle size used for microfiltration ...
In this paper , the complex reaction of water - Soluble meso -tetra (4-Sulfophenyl) porphyrin (TPPS4) with Fe( III) ion has been studied in the presence of small amount of hydroxyl amine . The porphyrin was found to be a highly sensitive and highly selective reagent for direct spectrophotometric determination of iron at g level .The soret band of the complex lay at 394 nm ( : 3.88 x 105L.M-1cm-1 ) , which is well separated from that of the reagent 432 nm ,( = 2.2 x 105 L.M-1. Cm-1) below PH 2The complex formation is slow at room temperature and PH 5.0 , however , it can be accelerated by heating on boiling water bath and completed within 10 min at 100 Co . five determinations of standard solutions containing 0.7 mg /10mL of iron gave a relative standard deviation of 2.61%. Beers law is obeyed for iron (III) in the range of 0.01-2.0 g/10ml . The molar ratio of complex is 1:1. This method has been applied to determine iron (III) in water samples with satisfactory results. The complex is highly ...
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Two challenges in mechanics of granular media are taken up in this paper: (i) development of adequate numerical discrete element models of topologically disordered granular assemblies, and (ii) calculation of macroscopic elastic moduli of such materials using effective medium theories. Consideration of the first one leads to an adaptation of a spring-network (Kirkwood) model of solid-state physics to disordered systems, which is developed in the context of planar Delaunay networks. The model employs two linear springs: a normal one along an edge connecting two neighboring vertices (grain centers) which accounts for normal interactions between the grains, as well as an angular one which accounts for angle changes between two edges incident onto the same vertex; edges remain straight and grain rotations do not appear. This model is then used to predict elastic moduli of two-phase granular materials-random mixtures of soft and stiff grains -for high coordination numbers. It is found here that an ...