Category Archive Pumping system z=25 m z=0.5 m z=0 p p

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Pumping system z=25 m z=0.5 m z=0 p p

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances. The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records.

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Skip to Content. You may need to read it again. Do not pass it on to others. It may harm them, even if their symptoms are the same as yours. This includes any possible side effects not listed in this leaflet. Your doctor will not use Chlorhexidine for Irrigation if any of the above apply.

If you are not sure talk to your doctor, nurse or pharmacist before using Chlorhexidine for Irrigation. Your doctor will take special care when giving you Chlorhexidine for Irrigation if: Throughout this leaflet, Chlorhexidine Acetate BP 0. If you are not sure if this applies to you, talk to your doctor, nurse or pharmacist before having Chlorhexidine for Irrigation.

In this leaflet: 1. What Chlorhexidine for Irrigation is and what it is used for 2. What you need to know before you use Chlorhexidine for Irrigation 3. How to use Chlorhexidine for Irrigation 4. Possible side effects 5. How to store Chlorhexidine for Irrigation 6. Early symptoms of a severe allergic reaction may be skin rash or asthma. If you notice these symptoms, stop using Chlorhexidine for Irrigation and contact your doctor as soon as possible see under section 4: "Possible side effects".The present invention relates to the field of fiber lasers, and more particularly, to increasing the modal instability threshold in high power fiber lasers.

Prior to setting forth the background of the related art, it may be helpful to set forth definitions of certain terms that will be used hereinafter. By the above definition, a fiber laser would also include a master oscillator power amplifier MOPA fiber device including a non-fiber oscillator, e. A typical fiber laser 91 is pumped by diodes, via a coupler, to emit laser light denoted by the arrow and comprises high reflector HR and output coupler OC fiber Bragg gratings FBGs that define its cavity, as illustrated schematically in FIG.

One of the main power limits for high power fiber lasers is thermal modal instability TMI or MIwhich has been discovered relatively recently and whose exact physical explanation is still not precisely known. MI has also been extensively reported in fiber amplifiers, which have a similar structure to the oscillator depicted in FIG. By increasing the optical pump power from the diodes, the power of the laser increases until a certain point in which, as pump power is added, the power of the fundamental mode of the laser decreases as shown graph 91 B due to modal instability.

The laser power decreases above the MI threshold as the higher order modes are stripped off from the core in the fiber, a process shown schematically in 91 C which depicts spatial profiles of the beam exiting the fiber laser without mode stripping.

A beam that is normally single mode changes suddenly to have a temporally variable spatial multimode profile once the MI threshold pump power is crossed, and the normally single mode stable laser couples into higher order modes. Temporal changes on the order of a millisecond are seen in the spatial profile. The reason for the power reduction due to MI 91 B is that most high power lasers are built from few-mode fibers operating in a single mode as the fundamental mode which are coiled to remove the higher order modes, causing significant losses to the higher order modes.

Once modal instability occurs in such a fiber laser, the light from the fundamental mode left-hand side of diagram 91 C is transferred to higher order modes right-hand side of diagram 91 Cand the coil strips these higher order modes from the core of the fiber—and the stripped energy is not delivered to the output of the laser. The following is a simplified summary providing an initial understanding of the invention. The summary does not necessarily identify key elements nor limit the scope of the invention, but merely serves as an introduction to the following description.

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For a better understanding of embodiments of the invention and to show how the same may be carried into effect, reference will now be made, purely by way of example, to the accompanying drawings in which like numerals designate corresponding elements or sections throughout. Prior to the detailed description being set forth, it may be helpful to set forth definitions of certain terms that will be used hereinafter. Examples of such devices include Nlight's e The difference between these two diode types is that the wavelength locked diodes have a wavelength locking element such as a volume Bragg grating VBG or fiber Bragg grating FBG to provide external feed back into the laser diode in order to define the spectral peak.

Spontaneous light-mediated magnetism in cold atoms

WL diodes often have a fixed spectrum over a large range of pump currents and temperatures. For example, a typical single emitter diode has a peak wavelength shift of 1 nm per ampere of pump current and a 0. A wavelength locked diode has almost no peak wavelength shift over the operating current and operating temperature ranges. In the following description, various aspects of the present invention are described.

For purposes of explanation, specific configurations and details are set forth in order to provide a thorough understanding of the present invention.

However, it will also be apparent to one skilled in the art that the present invention may be practiced without the specific details presented herein. Furthermore, well known features may have been omitted or simplified in order not to obscure the present invention.

With specific reference to the drawings, it is stressed that the particulars shown are by way of example and for purposes of illustrative discussion of the present invention only, and are presented in the cause of providing what is believed to be the most useful and readily understood description of the principles and conceptual aspects of the invention.Medically reviewed by Drugs.

Last updated on Dec 19, Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

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A Nature Research Journal. An electron gas in a one-dimensional periodic potential can be transported even in the absence of a voltage bias if the potential is slowly and periodically modulated in time. Remarkably, the transferred charge per cycle is sensitive only to the topology of the path in parameter space.

Although this so-called Thouless charge pump was first proposed more than thirty years ago 1it has not yet been realized. Here we report the demonstration of topological Thouless pumping using ultracold fermionic atoms in a dynamically controlled optical superlattice.

We observe a shift of the atomic cloud as a result of pumping, and extract the topological invariance of the pumping process from this shift. We demonstrate the topological nature of the Thouless pump by varying the topology of the pumping path and verify that the topological pump indeed works in the quantum regime by varying the speed and temperature.

Topology manifests itself in physics in a variety of ways 234with the integer quantum Hall effect IQHE being one of the best-known examples in condensed matter systems. There, the Hall conductance of a two-dimensional electron gas is quantized very precisely in units of fundamental constants 5.

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As discussed in the celebrated Thouless—Kohmoto—Nightingale—den Nijs paper 6this quantized value is given by a topological invariant, the sum of the Chern numbers of the occupied energy bands. InThouless considered a seemingly different phenomenon of quantum transport of an electron gas in an infinite one-dimensional periodic potential, driven in a periodic cycle 1.

This seems to be similar to the famous Archimedes screw 7which pumps water via a rotating spiral tube. However, whereas the Archimedes screw follows classical physics and the pumped amount of water can be changed continuously by tilting the screw, the charge pumped by the Thouless pump is a topological quantum number and not affected by a smooth change of parameters 1. Interestingly, this quantization of pumped charge shares the same topological origin as the IQHE.

Topological pumping is seen as a shift of the centre of mass CoM of an atomic cloud measured with in situ imaging. We extract the Chern number of the pumping procedure from the average shift of the CoM per pumping cycle. The topological nature of the pump is revealed by the clear dependence on the topology of the pumping trajectories in parameter space as to whether the trajectory is enclosing the degenerate point or not. Our work introduces a new experimental platform to study topological quantum phenomena in adiabatic driven systems.

In our experiments, an ultracold Fermi gas of ytterbium atoms Yb is prepared see Methods and loaded into a dynamically controlled optical superlattice. As a result, these laser beams create the required 18 time-dependent one-dimensional optical superlattice of the form. We have ensured that the bandgap never closes during the whole pumping procedure, so ideally the atoms stay in the lowest band during the adiabatic pumping process.

The ability to tune all parameters of the lattice potential 1 independently in a dynamic way offers the opportunity to realize various pumping protocols. In the absence of the static short lattice, V zt describes the simple sliding lattice which Thouless originally proposed 1.

Including the V S term, one realizes the double-well lattice illustrated in Fig. A pictorial understanding of this alternative pumping process is provided by the tight-binding Rice—Mele model 1920. We ignore the spin degree of freedom because we can neglect the interaction between the two spin components owing to a very small s -wave scattering length Schematic of the continuous Rice—Mele cRM pumping sequence.

The pink shaded packet indicates the wavefunction of a particular atom initially localized at the unit cell i.As ions are transported, they become transiently trapped between intracellular and extracellular gates. Consistent with these results, molecular dynamics simulations of a pump model show a wide water-filled access channel connecting the binding site to the external solution. Ions reach their binding sites through hydrophilic paths called access channels.

The properties of these transient currents were consistent with ions traversing the electric field through access channels.

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The latter relaxed monoexponentially to near-zero current values Fig. Experimental solutions were designed to populate states encircled by dotted lines. Subtraction of trace 2 from 1 provides an evaluation for the stability of the preparation. Time control signals have temporal decays comparable to the voltage clamp speed and they likely originate from changes in series resistance Irrespective of the length of the voltage step, the fast pump-mediated charge movement at the end of the pulse has similar magnitudes Fig.

A parsimonious explanation of this component is a change in the electric field produced by ouabain binding Supplementary Fig. In contrast, the slow charge Q s increases monotonically with a time constant similar to the slow On relaxation Fig.

The fast component Q f remains essentially constant. Supplementary Fig. Extending the range of membrane potentials Fig. Our results concur with these predictions Fig.

In detail, however, there are substantial differences. Solid lines through the data Fig.

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We have fitted our data to these two models Fig. In the model structure, the two ion-binding sites are accessible to the extracellular solution via a wide aqueous channel Fig. Site II is directly exposed to the extracellular solution, while site I is located at the bottom of a deep binding cleft with coordination provided by acidic side chains Fig. These values are also consistent with estimates based on a linear response approximation equation 12which allows one to visualize the spatial dependence of the applied membrane potential Methods.

Remarkably, the calculations are close to the experimentally determined values 0. The model and the crystal structure show similarity, especially in the TM region, where the backbone root mean squared deviation r. More specifically, M1—M3 undergoes a piston-like motion and is pulled towards the intracellular matrix.

This makes room for the extracellular portion of M4 residues W to Nwhich then tilts and opens up an aqueous channel between M4 and M6 for ions reaching the binding site Fig. Interestingly, several of these residues are known to be along the open conducting ion channel arising in the palytoxin-bound conformation 3132 The vertical axis marks the position along the z axis membrane normal in the membrane-pump system.

The horizontal axis on the bottom is the radius of the solvent accessible cross-sectional area within the pump along z. The radius profile of the occluded state crystal structure in a is shown in red. As the extracellular portion of the pump opens, the radius increases at the extracellular side. The radius profile in the final open model is in magenta and those of two intermediate states are shown in green and blue.

The lipid headgroup peak density z locations are shown with grey horizontal bars on top of the protein structures in ab. Helices M4 and M6 line the aqueous pathway leading from the extracellular matrix to the binding site and therefore are shown in cartoon representation.

Residues that are in direct contact with water molecules are shown in red sticks. Other helices are shown in surface representation. These results suggest that our K d 0 values are possibly overestimated at least three-fold by TMA competition for the extracellular access channel. Humboldt squid Dosidicus gigas were collected in the coast of Valparaiso, Chile.

Giant axon preparation and electrophysiology were performed as in Castillo et al. Membrane voltage is measured and controlled between an internal glass electrode filled with 0.High accuracy and repeatability accuracy is within 0. Contains a stepper-driven motor that creates a reliable choice for a variety of applications. A slim, compact design that saves on valuable manufacturing space. Easy to concatenate together for automation.

Use this table as a guide in deciding which pump head and drive configuration will best suit your needs. Accuracy and reliability are the hallmarks of a high-end precision metering pump. The Zaxis eVmP design combines ceramic internals, an elegant valveless build, electronic adjustment, and the use of positive displacement. This creates a durable, low maintenance pump with simple displacement adjustment that is highly accurate and repeatable.

Additives such as flavors, sweeteners, and preservatives require consistency and accuracy for quality production. A Growing industry with, promising medical applications, that requires precise delivery methods such as drops, softgels, vaporizers, and topical. Clear automotive glass primer, anti-scratch or uv glass coating, or primer for gluing glass to metal, all require consistency and reliability. Often used in the manufacturing process as a mold release or for functional ingredients such as a cereal varnish.

Accuracy and repeatability are important, when adding color in food manufacturing, to achieve a consistent end product. Conditioning is vital for proper functionality of materials such as automotive weather stripping, which requires an anti-stick coating. Cosmetic applications for precision metering are vast and include Fill-Form-Pack, repeatable—precise color mixing, and much more.

Many medical devices require minuscule amounts of fluid, usually adhesive or lubrication, during assembly. Reagent kits require extremely precise reagent volumes and concentrations to guarantee accurate patient results.

Food and beverage packaging automation requires fast and reliable fluid dispensing to maintain quality products and high throughput. Involves the precise metering of pharmaceuticals for gel capsule manufacturing. With recipe control, the eVmP makes product changeover very easy.

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Automotive manufacturing entails assembling many moving parts that require thorough lubrication for proper functionality. Specific metered prescription doses, packaged for individual use such as an epinephrine glucose auto injector. To keep a manufacturing facility running at peak throughput, all machines and robotics need to be consistently maintained and lubricated. Consistent adhesive pigment distribution in toy manufacturing is key to product durability and coherence.

The effects of filtration, purification and alteration of minerals, chemicals and contaminants in water are far-reaching and demand accuracy. Necessary cookies are absolutely essential for the website to function properly. This category only includes cookies that ensures basic functionalities and security features of the website. These cookies do not store any personal information. Any cookies that may not be particularly necessary for the website to function and is used specifically to collect user personal data via analytics, ads, other embedded contents are termed as non-necessary cookies.

It is mandatory to procure user consent prior to running these cookies on your website. Configure a Metering Pump Contact us today to find the right solution for your needs.

Request a Quote. Ceramic Internals Durable, long lasting, abrasion resistant. Valveless Design Easy to clean, easy to maintain, simple changeover. Positive Displacement High accuracy and repeatability accuracy is within 0.

Learn More. IMP A slim, compact design that saves on valuable manufacturing space. Contact us today to find the right solution for your needs. Engineering The patented eVmP system is a precision metering and fluid dispenser combined with a detachable Touch Screen Interface TSi for simple programing and immediate teach and control.Thank you for visiting nature.

You are using a browser version with limited support for CSS. To obtain the best experience, we recommend you use a more up to date browser or turn off compatibility mode in Internet Explorer. In the meantime, to ensure continued support, we are displaying the site without styles and JavaScript. A Nature Research Journal. Cold atom setups are now commonly employed in simulations of condensed matter phenomena.

We present an approach to induce strong magnetic interactions between atoms on a self-organized lattice using diffraction of light. Diffractive propagation of structured light fields leads to an exchange between phase and amplitude modulated planes which can be used to couple atomic degrees of freedom via optical pumping nonlinearities.

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In the experiment a cold cloud of Rb atoms placed near a retro-reflecting mirror is driven by a detuned pump laser. We demonstrate spontaneous magnetic ordering in the Zeeman sublevels of the atomic ground state: anti-ferromagnetic structures on a square lattice and ferrimagnetic structures on a hexagonal lattice in zero and a weak longitudinal magnetic field, respectively.

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The ordered state is destroyed by a transverse magnetic field via coherent dynamics. A connection to the transverse quantum Ising model is drawn. Improving the understanding of magnetic interactions is of paramount importance due to the challenges associated with exotic magnetic phenomena, the potential connections to high-Tc superconductivity, and the widespread use of magnetic materials in current technology.

These simulators have been used to investigate classical 2 and quantum 34567 magnetism, including the role played by the range of the spin-interaction 8910 Without externally applied optical lattices, spontaneous magnetization of spinor condensates 121314 has been observed. Magnetic coupling between atoms is obtained via artificial gauge fields 1516 or via dipole-dipole interaction of polar molecules 17highly magnetic atoms 18and Rydberg atoms 59 Here we provide an alternative approach where spin-spin interactions in a cold atomic gas are mediated through light over length scales determined by diffractive dephasing.

We demonstrate antiferromagnetic and ferrimagnetic phases. Transitions between magnetic phases are induced by external magnetic fields in close connection to the transverse quantum Ising model 19202122232425 The matter density in ensembles of laser-cooled thermal atoms is typically too low to observe direct magnetic interactions between atoms in different Zeeman states. In our experiment, however, strong interactions and magnetic ordering are mediated through state-selective optical nonlinearities combined with diffractive light propagation in a feedback scheme as sketched in Fig.

The beam is detuned from the atomic transition by several linewidths such that single-pass absorption is moderate and the nonlinear effects described here are mainly dispersive in character.

Under these conditions a spatial modulation of a state variable in the atomic system at a transverse wavenumber q will impart a phase modulation on the transmitted light. Diffractive dephasing in the feedback loop results in conversion of phase to amplitude modulations. This conversion is related to the Talbot effect 28a self-imaging effect for periodic light structures. This provides the light-mediated coupling in our experiment.

This is similar to the symmetry breaking in multi-mode cavities 2930but different from transversely pumped single-mode cavities 31323334 in which the symmetry and orientation of the spatial structures is determined by the pump and cavity axis.

For cold quasilevel atoms in non-cavity schemes, the spontaneous emergence of ordered structures was demonstrated previously in experiments using either opto-mechanical nonlinearities due to the dipole force 35 or Sisyphus cooling-assisted bunching 3637 or inversion patterns due to the saturation of the atomic transition Principle of experiment. In order to produce magnetic ordering, the magnetic substructure of the atomic states can be exploited.

When a low saturation parameter is employed, the optical properties of the gas are determined by the magnetization in the ground state. It is produced by pumping with an optical beam possessing a net spin, i. In zero magnetic field, this process is described by. The latter saturation term ensures that the spin orientation remains bounded. As indicated, we concentrate on the interaction of the optical spin with the atomic dipole moment tensor rank 1 of irreducible tensor components


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Mogal Posted on10:12 pm - Oct 2, 2012

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