170 research outputs found
SET based experiments for HTSC materials: II
The cuprates seem to exhibit statistics, dimensionality and phase transitions
in novel ways. The nature of excitations
[i.e. quasiparticle or collective], spin-charge separation, stripes [static
and dynamics], inhomogeneities, psuedogap, effect of impurity dopings [e.g. Zn,
Ni] and any other phenomenon in these materials must be consistently
understood. In this note we further discuss our original suggestion of using
Single Electron Tunneling Transistor
[SET] based experiments to understand the role of charge dynamics in these
systems. Assuming that SET operates as an efficient charge detection system we
can expect to understand the underlying physics of charge transport and charge
fluctuations in these materials for a range of doping. Experiments such as
these can be classed in a general sense as mesoscopic and nano characterization
of cuprates and related materials. In principle such experiments can show if
electron is fractionalized in cuprates as indicated by ARPES data. In contrast
to flux trapping experiments SET based experiments are more direct in providing
evidence about spin-charge separation. In addition a detailed picture of nano
charge dynamics in cuprates may be obtained.Comment: 10 pages revtex plus four figures; ICMAT 2001 Conference Symposium P:
P10-0
Parameters for Systems Exhibiting Local Lattice Distortions, Charge and Spin Ordering
Keeping in mind the experimental results that indicate local lattice
distortions, charge and spin orderings, we have developed a phenomenological
approach which allows us to describe the electronic phase diagram of cuprates
and related systems in terms of few parameters.In the present work we consider
a third-order parameter theory which characterize charge, spin and
superconductivity orderings. We are thus led to a theory of three scalar
fields. By coupling these scalars to gauge fields we are naturally led to
string-like solutions, which we interpret as stripes. This ties nicely with our
quantum group conjecture that 1d systems play an important role in the physics
of cuprates and related materials. We show that this simple approach can give
rough values for two-order parameters which can be naively be interpreted as
charge and spin orderings. We also report our attempt to understand how local
lattice distortions are involved and what role they play in terms of these two
order parameters.Comment: 8 pages revtex, Published in AIP Conference Proceedings 554: Int.
Sym. on Physics in Local Lattice Distortions, July 23-26, 200
To Prescribe or not Prescribe that is the Question!
To prescribe or not prescribed that is the question. If William Shakespeare was a pharmacist and living today he could probably ask his fellow pharmacists this question. To put it another way, should pharmacists be allowed to extend number of refills without prior authorization from the prescriber or even initiate new prescription? In Ontario, Canada, a new bill was proposed to allow pharmacists to extend refills on prescriptions without first checking it with the original prescriber of the prescription. In New Brunswick, Canada, they were moving in the direction of allowing pharmacists to diagnose and prescribe for minor illnesses. In the last five years, seven out of ten Canadian provinces now allow pharmacists to prescribe in some fashion that include extending refills on an existing prescription or allowing them to initiate a new prescription. As one can see that the precedent has already set where pharmacists are allowed to extend refills on prescriptions without first checking it with prescribers. As one can imagine, this is rather controversial as some of the medical associations fear that this would set a wrong precedent while some physicians, albeit at individual level, are welcoming it both in Canada and the United States. The US Department of Veterans Affairs and some of the other Public Health Agencies’ pharmacists have long been extending refills on prescriptions. As a matter of fact, the VA pharmacists were recently authorized to initiate new prescriptions as mid-level practitioners. In Florida, the pharmacists have been prescribing from a limited formulary list of medications for many years now
Ethyl Glucuronide: A biomarker for Acute Alcohol Ingestion
Ethyl glucuronide (EtG) along with ethyl sulfate (EtS) test validity are commented on. Sensitivity, specificity and reference threshold levels for urine screen are outlined. The accidental ingestion and absorption of ethanol from household products are also discussed. Ethyl glucuronide, a biochemical marker for ethanol, is a useful screen after acute alcohol ingestion, whether intentional or accidental. Keywords: Ethyl Glucuronide, Biomarkers, Ethanol, Alcohol ingestio
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