Electronic Prototype and Electron Beam Melting Information
and Definition for this alternative to rapid prototyping.
Electron Beam Melting or EBM is a great new alternative
method, that can be used instead of both rapid prototyping and manufacturing of
metal products. The method is especially useful to the aerospace industry.
The technology is becoming very popular because it has the
ability t
Hello guys, I’ve been out for quite sometime for so many reasons to mention. I missed my blog for so long but no worries cause finally I’m back. I would like to share my experience on this EON visa debit card from Union Bank. This card can be used to verify your Paypal account. This [...]
How will a quantum physicist address the Electron ?
O Electron ! Thou art a Particle; Thou art a Wave !
A mystic wrote
Thou Art Time; Timeless also Thou art !
Thou Art Space and all that is in Space !
Thou Art Causality and the Cause and the Effect !
The quantum physicist tells the mystic about the amazing [...]
An often neglected area of study in modern electronics is that of tubes, more precisely known as vacuum tubes or electron tubes. Almost completely overshadowed by semiconductor, or "solid-state" components in most modern applications, tube technology once dominated electronic circuit design. In fact, the historical transition from "electric" to "electronic" circuits really began with tubes, for it was with tubes that we entered into a whole new realm of circuit function: a way of controlling the flow of electrons (current) in a circuit by means of another electric signal (in the case of most tubes, the controlling signal is a small voltage). The semiconductor counterpart to the tube, of course, is the transistor. Transistors perform much the same function as tubes: controlling the flow
The Bird-Electron EZ0 Portable Speaker just has a great design. Bringing anywhere, this Japan import speakers are encased in a compact aluminum body and it require no power source. It is available in red, white, and limited edition gold, silver and anodized blue. The Bird-Electron EZ0 measures W73 x H76 x D32 mm and weighs [...]
The North Face Electron 25 Backpack - 1525 cu in $64.32 With a breathable foam shoulder harness and back panel, The North Face Electron 25 Backpack keeps you comfortable on your day hikes. As you heat up, the Electron 25 pack's lightweight panels allow air to circulate between you and the pack so you don't end up with a sweat-soaked back and shoulders. Keep your water reservoir in the back hydration panel, or store water bottles in the two side stretch pockets. If you hop in the lake for a mid-day swim, stuff your wet towel and suit in the bottom wet/dry compartment and keep the rest of your gear dry as you head back to the car.
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The video you linked to was produced at the Lund Institute of Technology in Sweden. It's really good science, and less than a month old, but like many popular science headlines, the description of the video is very misleading and it takes a bit of reading to understand what you are really seeing. What you were seeing is not a direct image of a single electron's orbit, as the title suggests. Instead you are viewing a two-dimensional scattering pattern from many electrons that have been ionized by very short ultraviolet (UV) laser pulses (By short I mean 300 attoseconds, or 300 billionths of a billionth of a second!). The short laser pulses are precisely timed relative to a strong infrared (IR) laser whose electric field holds the ionized electrons in a confined position. The precise timing
Moving any chargedparticles will produce a magnetic field around them. If we move theseparticles across an external magnetic field the two fields interact and theparticles feel a force mutually perpendicular to the external field andtheir direction of motion. This is the force that we say induces a currentor voltage and it has nothing to do with whether or not the particles inquestion (electrons in the case of wires) each have an inherent individualmagnetic field of their own or not. Most high school and freshman collegephysics textbooks will have some pretty good pictures of this behavior. Atthe atomic level in a material like copper there is about one electron peratom that is essentially free to move about in the wire. If this wire ismoved across an outside magnetic field then thes
It would help if in questioning a source, you gave an accurate reference to the source. I have searched Encarta and think I found the quote at exact quote I see in section IV is: "The length of the string, or the distance the wave on the string occupies, is equal to a whole or half number of wavelengths. At these distances, the wave bounces back at either end and constructively interferes with itself, which strengthens the wave. Similarly, an electron wave occupies a distance around the nucleus of an atom, or a circumference, that enables it to travel a whole or half number of wavelengths before looping back on itself." The problem with the quote is the word "similarly". The boundary conditions for a circular loop are different than those for a violin string. The violin string allows h
Scientists from Swedish Univeristy of Lund have filmed an electron in motion for the first time, using a new technique that will allow researchers to study the tiny particle's movements directly.Extremely short flashes of light are necessary to capture an electron in motion. A technology developed within the last few years can generate short pulses of intense laser light, called attosecond pulses, to get the job done. And here's the photograph of an electron:
Swedish researchers have captured their first clear view of an electron riding on a light wave. Technique use short pulses of light called attosecond pulses. It takes about 150 attoseconds for an electron to circle the nucleus of an atom. An attosecond is 10-18 seconds long, or, expressed in another way: an attosecond is related to a second as a second is related to the age of the universe.
I finally received the pin number for my debit card from public bank last friday. Immediately I drove to the nearest public bank at my place to withdraw. I inserted the debit card into the atm, then entered the pin provided by public bank. After that i requested to change the pin, when i'm done, the atm returned my card to me.Only 1 atm that is working and at that time, there's already 2 guys behind me, waiting for their turn. After changing the password, I insert my card again to the atm, i already heard the uncle behind me ngee ngee ngam ngam already. :p sorry lar, first time withdrawing mar.. So when i was at the screen, i did not know which option to choose. Why? Hmm, there's no withdraw option there? How am i suppose to withdraw? Which one should i choose? Cash Advance or Fast Cash?Finally i picked the Fast Cash, but it didn't allow me to enter how much I want to withdraw, the atm returned my card and RM 200. Oo, so fast cash means withdraw RM 200 lar.. but i wanted to withdra
Surprised surprised surprised!!! I went to the public bank this morning to apply for the ebanking for my debit card. I got the pin no on the spot but the customer service asked me to wait till tomorrow 7pm before i can used it. When i got home just now, at about 7pm+, i decided to try it out. Just try lar, maybe i can used it leh, no harm trying right?And guess what? I really can used it!! wow, tat's pretty fast right? Ya, i'm already quite happy and wait, i got some more good news! What's that? I login and checked on my transaction to get the code to verify my debit card on paypal and i don't believe what i saw!! Am i dreaming?? I saw my money from paypal that i withdraw on last friday!! WOW, WOW, WOW that's really really unexpected!!I withdraw on friday morning, and the transaction showed money being transferred to my account on that same day, which is 9 of Nov! I thought we need to wait for at least 7 days? I haven't even verified my debit card on paypal yet!! That is just soo
When i reached home about 7pm++ just now, i saw there's a note from pos laju sticked on my door. There's a courier item delivered to me and I cannot send representative to collect it! Courier item? nobody is sending anything to me and i did not apply any credit card recently, so the biggest possibility is from the Public Bank! Yes, the Visa Electron Debit Card!!!! But on the application form, i clearly stated that i wanted to collect the card at the branch, not delivered to me!!Anyway, it can't be that fast what. The Pos Laju's note stated they delivered the item to me at about 12:30pm, I bank in the money around 10am this morning, cannot be that fast what, right? Within 2 hours they are able to send me the card? It is totally unbelievable!!Nevermind, i told myself, i can collect the item tomorrow, then i will know what is that item!! oh wait, they closed on first saturday!! shit!! that means i can only collect the item next saturday. arggg, i don't think i can wait that long!! I
I submitted my application to one of the Public Bank's branch on the 5th of October. After submitted for around 2 weeks, i called the customer service to check on my card application. I don' t know whether i'm just so unlucky, or all their customer service are not well trained. Everytime i called, i'm being answered by some RUDE customer service and it really makes my mood bad after talking to them.Since I can't get any answers from calling the customer service, i decided not to waste anymore money on these useless phone calls. I decided to go to the branch to talk face to face to the customer service there. Of cos, it's not a pleasant conversation too, the branch showed me the documents from HQ, my application was being sent and confirmed received by the HQ on the 9 of October but why it's still not in the system? The answer they gave me? Asked me to wait and wait and wait. Hey, i'm not trying to get my card approved, i just hope that my application are submitted and entered t
Question: Will an electron, in an orbit with other electrons, ever travel along the same path twice or will it travel in a chaotic path which will eventually cross every single point in that orbit without ever travelling along that identical path?-------------------------------------------The flippant answer is "none of the above". It is not incorrect to think of electrons in atomic or molecular orbitals as planets orbiting the Sun. Electrons obey quantum mechanics, while planets obey Newtonian (classical) mechanics [more or less because frequently simplifying assumptions are made about ignoring the gravitational effects of all the other planets. The two are very different.Electrons behave more like waves when confined to stable atomic/molecular states, but even this picture is incomplete, because the "waves" are not like throwing pebbles in a pond.Quantum mechanics only allows us to compute the "probability" that an electron will be at a point in space, and it really is not a "point"
Electron Affinity is the process during which one mol of a gaseous atom accepts mol of electron to form one mol of a gaseous unipositive ion.
This process is always accompanied by an energy change.
Across period 2 and 3, from left to right, electron affinity increases. This is because proton number is increasing and effective nuclear charge is increasing.
Na, Mg and Al lose electrons to attain rare gas configuration. Therefore they have: +ve kJ/mol dH(ea)
Si, P, S and Cl accept electrons to attain rare gas configuration. Therefore they have: -ve kJ/mol dH(ea)
The above is true for elements that form uninegative ions.
When an element forms a dinegative ion, it accepts the electrons successively.
This means that there are two energy changes.
Considering Oxygen, the first EA is exothermic. This is because the oxygen atom readily accepts the incoming electron to complete its outermost orbital. Also, its effective nuclear charge is relatively large.
However, the second EA of oxygen is highl
This is a difficult question to answer, because it is not clear to me where you wish to apply the oscillating electric field (before or after the slits?), or for that matter, what you are trying to accomplish by this. That having been said, I think that the result of putting an oscillating electric field into a double-slit experiment setup would be to partly or completely destroy the interference pattern. The double-slit experiment is a measure of the spatial, or time-independent wavefunctions of the electrons. To do this, the electrons arriving at the slits should all have the same energy. Once they pass through, the time-independent wavefunctions from the two slits interfere with each other to produce the characteristic interference pattern. Now, if you put an oscillating electric field between the source and the slits, the electrons will arrive at the slits with different energies depending on the time. If the oscillating field is after the slits, the electrons could arrive at the s
This is a difficult question to answer, because it is not clear to me where you wish to apply the oscillating electric field (before or after the slits?), or for that matter, what you are trying to accomplish by this. That having been said, I think that the result of putting an oscillating electric field into a double-slit experiment setup would be to partly or completely destroy the interference pattern. The double-slit experiment is a measure of the spatial, or time-independent wavefunctions of the electrons. To do this, the electrons arriving at the slits should all have the same energy. Once they pass through, the time-independent wavefunctions from the two slits interfere with each other to produce the characteristic interference pattern. Now, if you put an oscillating electric field between the source and the slits, the electrons will arrive at the slits with different energies depending on the time. If the oscillating field is after the slits, the electrons could arrive at the s
