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Aharonov-Bohm effect - Wikipedia, the free encyclopedia The Aharonov-Bohm effect, sometimes called the Ehrenberg-Siday-Aharonov-Bohm effect, is a quantum mechanical phenomenon by which a charged particle is affected by electromagnetic fields in regions from which the particle is excluded. The earliest form of this effect was predicted by Werner Ehrenberg and R.E. Siday in 1949, and similar effects were later rediscovered by Aharonov and Bohm in 1959. The most commonly described case, sometimes called the Aharonov-Bohm solenoid effect, is when the wave function of a charged particle passing around a long solenoid experiences a phase shift as a result of the enclosed magnetic field, despite the magnetic field being zero in the region through which the particle passes. en.wikipedia.org /wiki/Aharonov-Bohm   (1369 words)

Hall effect - Wikipedia, the free encyclopedia The Hall effect refers to the potential difference (Hall voltage) on opposite sides of a thin sheet of conducting or semiconducting material in the form of a 'Hall bar' (or a van der Pauw element) through which an electric current is flowing, created by a magnetic field applied perpendicular to the Hall element. So-called "Hall effect sensors" are readily available from a number of different manufacturers, and may be used in various sensors such as fluid flow sensors, power sensors, and pressure sensors. The anomalous Hall effect can be either an extrinsic (disorder-related) effect due to spin-dependent scattering of the charge carriers, or an intrinsic effect which can be described in terms of the Berry phase effect in the crystal momentum space (k-space). en.wikipedia.org /wiki/Hall_effect   (1634 words)

Magnetic field - Wikipedia, the free encyclopedia This effect was utilised in early alternating-current electric motors. Because the Lorentz force is charge-sign-dependent (see above), it results in charge separation when a conductor with current is placed in a transverse magnetic field, with a buildup of opposite charges on two opposite sides of conductor in the direction normal to the magnetic field, and the potential difference between these sides can be measured. The Hall effect is often used to measure the magnitude of a magnetic field as well as to find the sign of the dominant charge carriers in semiconductors (negative electrons or positive holes). en.wikipedia.org /wiki/Magnetic_field   (2967 words)

The Aharonov-Bohm Effect The equipment for demonstrating the Aharonov-Bohm effect consists of a source of uniform energy electrons, a screen with two slits in it, a screen to capture the interference pattern and a solenoid. The solenoid is an electromagnet encased in an iron tube. In this case the curl of the vector potential is the magnet field and this is nonzero for the cross-section of the solenoid. www.applet-magic.com /bohm.htm   (597 words)

RS Electrogravitic References: Part 3 of 19 An effect on wavelength would be manifested as a change in the envelope of the interference pattern, rather than merely a shift in the pattern. Hooper, as well as Carr, Rognerud, Jefimenko, et al, find that a electromagnetic effect which is not shieldable, and hence difficult to distinguish from gravitation, results from equal and opposite electric currents (dipole-current), and that a similar effect can also be generated by a moving magnet or a moving electric current. A similar effect, Aharonov-Casher is disovered to occur due to the electric scalar potential, in regions of space where the Maxwell electric field vanishes. www.padrak.com /ine/RS_REF3.html   (2157 words)

Electronic control system for powershift transmission - Patent 4967385 The opening or orifice of a proportional solenoid valve 22f is variable depending upon the position of its valve spool or solenoid plunger, which is controlled by the electromagnetic field generated by the average DC voltage supplied to the proportional solenoid. It is desirable to monitor the current flowing through solenoid PMS since this current is directly proportional to the magnetic flux responsible for moving and precisely positioning the solenoid plunger valve spool assembly of valve 22f that determines the precise size of the variable orifice in valve 22f. Since the solenoid PMS is mounted on valve 22f in close proximity to the transmission 20, and since hydraulic fluid regularly flows through valve 22f, the temperature of the solenoid coil provides an approximate indication of the actual operating temperature of the transmission 20. www.freepatentsonline.com /4967385.html   (17280 words)

Chapter 16 Supplement; With References to 17, 18 & 23 Explain the effects of constitutive heterochromatin on genes nearby, in particular, the variegated position effect and the spreading effect. Solenoid structure: coils of nucleosomes, about six per turn formed when H1 is complexed with the nucleosome and DNA. They express a dosage effect and suggest that the material that forms heterochromatin (chromosomal proteins, probably) are in limited supply and can be a limiting factor in the degree of forming heterochromatin at a particular chromosomal site. www.utexas.edu /courses/zoo325/chap16.htm   (1150 words)

Power circuit for low power solenoid operation using an AC or DC supply - Patent 6075353 A power circuit for energizing a solenoid coil as claimed in claim 8 wherein said second voltage feedback means includes a junction field effect transistor in series with one of said parallel resistors and said junction field effect transistor. The junction field effect transistor is in series with a resistor which is in parallel with another resistor to develop a feedback voltage representative of the voltage output of the power circuit. The voltage applied to the gate of the junction field effect transistor is sensed across a capacitor to ground in a resistor-capacitor branch of the circuit measured across the output of the power circuit. www.freepatentsonline.com /6075353.html   (4582 words)

Aharonov-Bohm Effect in Synchrotron Radiation Radiation peculiarities caused by the presence of the solenoid may be considered as a manifestation of Aharonov-Bohm effect in the radiation. To calculate the impact of AB solenoid on particle radiation in magnetic field, we have found exact solutions of the Klein-Gordon and the Dirac equations in the superposition of a constant uniform magnetic field and parallel to it the AB field of the solenoid (such a superposition is called the magnetic-solenoid field). Peculiarities of the radiation related to the presence of the AB solenoid may be considered as a manifestation of the Aharonov-Bohm effect in the radiation. www.sbf1.sbfisica.org.br /eventos/enfpc/xxi/procs/res55   (1555 words)

Magnets and Electromagnets The magnetic field produced by electric current in a solenoid coil is similar to that of a bar magnet. An iron core has the effect of multiplying greatly the magnetic field of a solenoid compared to the air core solenoid on the left. The effect is the multiplication of the magnetic field by factors of tens to even thousands. hyperphysics.phy-astr.gsu.edu /hbase/magnetic/elemag.html   (330 words)

Lockup solenoid The effect is better gas mileage, as it reduces the speed of the engine by about 250 RPM when it cuts in. The lockup solenoid is under the cover on the left SIDE of the transmission. In line with the lockup solenoid there is a pressure switch that is normally open, if the computer tries to lock up the transmission but there is not enough pressure the pressure switch is open and it doesn't lock up - a mechanical interface to the transmission. chuck.kichline.com /fiero/TCC.htm   (1471 words)

Solenoids The average current in the coil of a DC industrial work solenoid is the simple result of average source voltage divided by the resistance of the coil. DC industrial work solenoids may be powered from pure DC sources such as batteries or electronic power supplies, or from time varying sources so long as the source is single polarity. If the industrial work solenoid will be required to generate a sustained holding force after it has moved the load through its working stroke, then, it most likely will be a requirement that the plunger seat itself is at the end of travel as opposed to being stopped by the load. www.trombetta.com /basics/solbasics.asp   (1202 words)

Magnetic Field   (Site not responding. Last check: 2007-10-30) Thus, the magnitude of B at a point near either end of a solenoid should be about one half that at points within the solenoid away from the ends. This is the experimentally determined value of B at the center of the solenoid. Calculate the theoretical value of B at the center of the solenoid using equation (1) and the value obtained for I. Make sure that all values you use are in the SI system. www.utc.edu /Faculty/Tatiana-Allen/magfield.html   (1551 words)

Venturi Effect Valves When a drink is dispensed both solenoid valves open, fresh cold water from the inlet valve displaces hot water through the dispense valve. The boiler is never pressurised because it is always open to atmosphere via the venturi and an appropriate flow control for the inlet valve restricts inlet flow to match the outlet flow. As hot water flows through the dispense valve the venturi draws water from the expansion vessel, when the water in the expansion vessel is exhausted the venturi draws air, this has no significant effect on the volume dispensed. www.betavalve.com /venturi.htm   (160 words)

[No title] It is demonstrated that this effect is linear with regards to the current and the magnetic field applied to the Hall substance. Two solenoids were placed end to end to form one long solenoid with a length of 31.0 ± 0.5 cm. They are uncertainty in length of the solenoid, and in the radius, as the radius had some thickness to it, and the equation used assumed perfectly thin walls. www.physics.ohio-state.edu /~p616/final/Hall_Eff_Martin.doc   (1589 words)

sciforums.com - Help with solenoid and electromagnetics What i mean is im using the equation for a solenoid to find the strength of the electro magnetic field in the solenoid so how would i find the force in newtons exerted on an object inside the tube of the solenoid. The magnetic field inside a solenoid is approximately uniform, so it will exert no force on a magnet placed inside unless you ramp the amount of current going through it so as to get a magnetic induction effect. A magnet half in and half out of one end of the solenoid will experience a force, but one in the middle of the solenoid will have no force on it, provided the solenoid current is constant. www.sciforums.com /showthread.php?t=19254   (540 words)

Tech to Tech The Sea Gull Effect, which I often refer to as the Gull Effect, is a result of mechanical movement of an inductor through a magnetic field. Above idle, when the compressor would engage (Figure 7) the Gull Effect was very evident due to the large magnetic field. This '96 Chevy Blazer EGR solenoid (Figure 10) is running at 10 percent duty cycle. www.asashop.org /autoinc/july99/techtotech.htm   (1257 words)

The Naked Scientists Science Discussion Forum - Lightbulb filament failure   (Site not responding. Last check: 2007-10-30) When electrical current passes through a solenoid a magnetic field is generated, (the coil becomes an electromagnet). The solenoid effect is probably part of the effect too, especially as when you just turn it on the rate of change of current could be very large so applying the biggest magnetic forces to the filament. In small bulbs, the former effect is most important. www.thenakedscientists.com /forum/topic.asp?TOPIC_ID=3008   (358 words)

Feature - Parker Fluid Control Division These are only a few of the many changes that have occurred to the solenoid valve, the workhorse of the chemical processor’s valve system. Solenoid valves typically have small amounts of some of these restricted substances. Specifically, four-way solenoid valves traditionally have a single or a dual operator for momentary or maintained position control. www.baumpub.com /publications/cep/cep_features/cep_0603_f3.htm   (681 words)

Swimming pool control with Linux The second knob mechanically adjusts the depth of the solenoid's stroke applied to the diaphragm against the pump head, thus adjusting the volume pumped by each stroke. A solenoid could control a liquid suction feed line, but only if you had a feedback control sensor for ORP, and a control algorithm sufficient to calibrate the unmetered feed rates, something like controlling a linear motor with impulses and feedback. A solenoid vacuum-breaker is more effective than a check-valve design, since the spring-operated check valve closes at some minimal negative pressure, instead of removing all vacuum. www.truetex.com /poolcontrol.htm   (11665 words)

AMPERE’S LAW & MAGNETIC FIELDS   (Site not responding. Last check: 2007-10-30) The magnetic field around the solenoid will be determined by a magnetic sensor; you will measure the output voltage of the sensor (which is proportional to B) using the Fluke multimeter. Measure the length and radius of the solenoid using the meter stick. Measure the magnetic field, with the sensor holder oriented along the solenoid axis (lengthwise), at the center and end of the solenoid (these are clearly marked on the part of the path inside the solenoid. www.physics.rutgers.edu /ugrad/205/1amp.html   (1868 words)

Brass solenoid valves, plastic solenoid valves, stainless steel solenoid valve, water meters, water filters, pressure ... Plastic solenoid valves: Servo assisted and direct acting types, together with dry armature and food grade valves suitable for vending machine use including special dispense valves. Solenoid Valves for hazardous areas: Many of our standard brass and stainless steel valves can be supplied with either EExm or EExd solenoid operators. WRAS approved valves: We have a wide range of solenoid valves included brass and plastic latching types that have been tested and approved by the WRc for potable (drinking) water use. www.betavalve.com   (325 words)

Aharanov-Bohm   (Site not responding. Last check: 2007-10-30) The Bohm-Aharanov effect is a quantum mechanical phenomenom that shows the influence of the vector potential A on the movement of charged particles. A tiny solenoid is added to the double slit experiment, between the slits; when there is a magnetic field inside it, it is expected a shift in the interference pattern which is proportional to the net flux of B throug the solenoid. The magnetic field inside the solenoid is handled by the horizontal left Scrollbar, and the radius of solenoid with right Scrollbar. fisica.udea.edu.co /~mpaez/aharanov/Bohmen.html   (133 words)

atoms coupled together to form Nanoclusters demonstrate nanoscale ordering not found at dimension above 20 nanometres This optical effect had been predicted theoretically to occur in metal nanostructures, but Georgia Institute of Technology researchers were the first to measure it in a special class of clusters they formulated. The optical effect changed direction as the researchers moved from one cluster size to the next, suggesting a direct correlation to the energies of the conduction electrons in the metal's outer shell. He believes the effect is related to the high level of confinement created in the conduction electrons by formation of the small clusters, though research has not yet confirmed that. www.raydionics.com /nanocluster.htm   (4280 words)

Solenoid - PbNation If you have a solenoid that actuates slower, then it will take longer to move the ram forward, and to move it back (the ram will be slower in moving). If you have a solenoid that requires a higher dwell to function properly (like one of the Humphrey's that require 16ms of dwell time), then that is more time that the ram has to sit foward, meaning the total cycling time is greater. Slower solenoids mean longer cycling times, which means reduced cycling rates. www.pbnation.com /showthread.php?t=332705   (530 words)

PH: waste gate capsule. is it faulty? The boost control solenoid vents pressure away from the hose by being pulsed open and closed by the ECU many times a second. Thus if the turbo is producing 10psi of boost, the solenoid mayb opening and closing in such a way to vent of 4psi so that the wastegate is only seeing 6psi. You could also confirm that boost solenoid is actually the issue by connecting the compressor outlet directly to the wastegate capsule - you should see pretty much the same amount of boost being produced. www.pistonheads.com /gassing/topic.asp?f=17&t=187457   (3224 words)

GMW Associates - 5751 HTS Short Solenoid - Overview By utilizing a coil wound from High Temperature Superconductor (HTS) wire the Model 5751 Short Solenoid is a compact assembly for the generation of an axial magnetic field that may be continuously varied between ±1T. The field uniformity is better than 1% over a central cylinder of 10mm diameter by 8mm length in a room-temperature bore of 35mm inside diameter, 190mm outside diameter and 72mm axial length. The overall radial length of the Solenoid and Cryocooler is 595mm with a weight of 10kg. www.gmw.com /electromagnets/Coils/5751/5751.html   (469 words)

Dark Forces Before quantum theory, physicists thouaht that an electron shooting past an ideal solenoid-a tube which has maanetic fields on the inside but not on the outside-would be unaffected by the field. He found there is a gravitational analogue of the solenoid effect: particles can "feel" their gravitational potential. Ahluwalia says neutrinos with mass would "feel" their gravitational potential, and one with a large potential at the centre of a shell would change from one neutrino "flavour" to another more slowly than one in free fall a large distance away. www.dhushara.com /book/quantcos/grav.htm   (2377 words)

need help with electrical problem you might also check for corrosion on the small terminal where the wire from the starter switch connects to the solenoid also and make sure this connection is clean and tight too. could be by smacking the solenoid you knock loose enough to make the connection good enough to start it again. Well,I changed my positive wire from the solenoid to the battery,and now it seems to be ok.Thx to all who replied. www.mustangforums.com /m_244546/printable.htm   (836 words)

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