The quark model has been successful in classifying the spectrum of mesons observed since the 1960s, however, it fails to explain some of the measured bound states. Lattice QCD predictions have shown that an excited gluonic field may contribute to the quantum numbers of the bound state and form hybrid mesons, qq-bar, where g is a constituent gluon. It is possible for some hybrids to possess quantum numbers forbidden by the quark model and are known as "smoking gun" hybrids due to their lack of mixing with conventional qq-bar states. The GlueX photoproduction experiment at Jefferson Lab in Newport News, VA is designed to study hybrid mesons and to map their spectrum. A 12 GeV electron beam produces 9 GeV linearly polarized photons via coherent bremsstrahlung in a diamond radiator which are incident on a liquid hydrogen target. In order to determine the photon energy, the use of a tagging spectrometer which measures the energy of the post-bremsstrahlung electron is required. The tagger microscope is a scintillating fiber detector designed to measure the energy of electrons corresponding to the polarized photons. The main focus of this work is the design and construction of the tagger microscope electronics as well as the calibration of the microscope within the experiment. Additionally, the analysis of the reaction (photon, proton) to (phi, proton), where the phi(1020) meson decays into K+K-, is discussed. This analysis provides a high-level calibration for GlueX in regards to understanding the acceptance and sensitivity of the detectors to mesons with strange quark content. By studying the phi with linearly polarized photons, information on the production mechanism can be extracted. The measurement of the phi meson spin-density matrix elements are shown and compared with past data which are found to be in agreement.
a chemical compound so imperfectly bound together that its composition will change in accordance with the concentration of chemicals in the solution in its presence. Advertisements
a soft, silver white, metallic chemical element occurring only in compounds. Sodium is of the alkali metals which oxidizes rapidly in the presence of air and reacts violently with water ( stored under kerosine).
a brittle grayish- white metal with a pink or red tint. Pure bismuth is harder than lead and melts at 520 °F. Also used with lead, tin, or iron to make alloys used for fusible bulbs and safety plugs for automatic sprinkler systems and boiler plugs. Bismuth is used chiefly in the formation of alloys […]
1. a substance used to promote fusion, especially of metals or minerals. 2. a substance (as rosin) applied to surfaces to be joined to clean and face them from oxide and promote their union.
a relatively soft material used in making joints watertight or airtight by being squeezed or compressed in the joining operation
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Pretty much my journey and how I feel about testing in Android. Add espresso, and life gets more complicated.
==================As part of my Google Summer of Code proposal, I am currently working on addingunit tests to OpenKey...
I implemented an account creation form with only one EditText. The idea here is to pack a multiple (4 in the sample) input form in one field. As a result, the user input is easier and a more fluent process.
Also, I completely rediscovered TextSwitcher[1] to animate the form: title, error message. It's very basic but simple to use.
Version 3.1 is here bringing a lot of new things. + a suggest form. You can now suggest what I should include in the next version from google apps & android os elements.
"Long regarded as being averse to change, the construction industry is entering a period of substantial adjustment."
Avocados are one of a kind when it comes to fruits. They’re as tasty as they are healthy, and are a great addition to our diets. Yet buying them from supermarkets isn’t always ideal – they can be pretty expensive. So it’s unsurprising that many avocado advocates want to have a go at growing their own.
Hiring top-notch talent can be a challenge, often taking a huge amount of time, effort and intuition. While there are many recruiting strategies for construction to consider, start by focusing on these simple tips. https://buff.ly/2GcSFYR
A lot of well-known actors and music stars today actually had careers within the construction industry
From wearable technology such as smart helmets to sensors on construction equipment, there is a growing selection of technologies to assist with improved safety on the jobsite and project efficiency.
Construction recruitment strategies that work are essential to attracting qualified workers during a time when construction is booming, but labor is scarce. https://buff.ly/2DgFDGp
To attract the next generation of its workforce, the construction industry must emphasize technology and diversity.
"The building and construction industry contributes over £92 million to the UK economy, but currently suffers from a serious lack of gender diversity."
Your one-stop-shop for all the latest news and views from Jelf experts and advisers. We aim to cover all things insurance, employee benefits and risk management. And we discuss risks faced by both business and individuals.
The construction tech industry spans emerging categories such as collaboration software, marketplaces, and frontier tech applications.
So much growth and so much pollution, are you doing your part? There are many ways construction companies can help preserve the environment. Whether it be reducing overall pollution or actual waste. Keeping our footprint on the environment smaller is becoming more and more of a priority these days.