320 research outputs found
Degree of Complementarity Determines the Nonlocality in Quantum Mechanics
Complementarity principle is one of the central concepts in quantum mechanics
which restricts joint measurement for certain observables. Of course, later
development shows that joint measurement could be possible for such observables
with the introduction of a certain degree of unsharpness or fuzziness in the
measurement. In this paper, we show that the optimal degree of unsharpness,
which guarantees the joint measurement of all possible pairs of dichotomic
observables, determines the degree of nonlocality in quantum mechanics as well
as in more general no-signaling theories.Comment: Close to published versio
One stage transanal full thickness pull-through operation for rectosigmoid Hirschsprung's disease
The surgical management of Hirschsprung's disease (HD) has changed from the original staged operations to the latest introduced minimally invasive one stage techniques. One stage transanal full thickness Swenson-like procedure is a new concept of single stage procedure for HD. We reviewed the early outcome of one stage transanal Swenson-like pull-through operation for rectosigmoid HD. By using the transanal concept we choose to apply Swenson's principle in transanal dissection for the primary treatment of HD and describe technical aspects and impact on fecal and urinary function. We reviewed our series of HD patient who underwent one-stage transanal full thickness, Swenson-like rectosigmoid dissection, assessing for postoperative stricture or stenosis, anastomotic leak, enterocolitis, obstruction and long-term results for bowel and urinary function. Of 15 patients all had the transanal resection, the age of the patients ranged from 6 months to 5 years. The average length of resection was 20 ± 5 cm. Mean follow-up was 24 months. 10 patients were at least three years old at follow-up and were assessed for urinary and fecal continence. All had the voluntary bowel movement and urinary continence. Three patients had episodes of postoperative enterocolitis and two patients developed stenosis at the anastomotic site. Postoperative frequent bowel movement was present in all patients and continued for 2-8 weeks. In conclusion, our data support the fact that a modification of Swenson's original transabdominal dissection concept using the recently describe transanal approach is an excellent technique for HD and produces excellent long-term outcome for fecal and urinary function.
Classical communication and non-classical fidelity of quantum teleportation
In quantum teleportation, the role of entanglement has been much discussed.
It is known that entanglement is necessary for achieving non-classical
teleportation fidelity. Here we focus on the amount of classical communication
that is necessary to obtain non-classical fidelity in teleportation. We
quantify the amount of classical communication that is sufficient for achieving
non-classical fidelity for two independent 1-bit and single 2-bits noisy
classical channels. It is shown that on average 0.208 bits of classical
communication is sufficient to get non-classical fidelity. We also find the
necessary amount of classical communication in case of isotropic
transformation. Finally we study how the amount of sufficient classical
communication increases with weakening of entanglement used in the
teleportation process.Comment: Accepted in Quantum Info. Proces
Vascularized dorsal dartos flap to prevent fistula in tubularized incised plate urethroplasty for primary distal and mid shaft hypospadias
The aim of the present study was to evaluate the importance of neourethral covering using vascularized dorsal flap for preventing fistula in Tabularized incised plate (TIP) urethroplasty. The study included 52 children (aged 2-10 years) who had hypospadias repaired including 44Â with distal and 8Â with mid shaft hypospadias. In all children, a standard tabularized incised plate urethroplasty was followed by reconstruction of new surrounding urethral tissue. A longitudinal dartos flap was harvested from excessive dorsal preputial and penile hypospadiac skin and transposed to ventral side by a buttonhole maneuver. It was sutured to the glans wings and the neomeatus and to the corpora covernosa over the neo-urethra. Thus the new urethra was completely covered with well-vascularzed subcutaneous tissue. At a mean follow-up of 18 months, the result was successful with no fistula or urethral stenosis, except 2 of the mid penile hypospadias. All patients had good functional and cosmetic results with straight penis and vertical slit shaped meatus at the tip of the penis. The 2 patients developed tiny fistula, which were closed spontaneously after meatal dilatation. In conclusion, urethral covering should be part of TIP urethroplasty. A dorsal well-vascularized dartos flap, button holed ventrally is a good choice for preventing fistula for distal and mid shaft hypospadias.
Local randomness in Hardy's correlations: Implications from information causality principle
Study of nonlocal correlations in term of Hardy's argument has been quite
popular in quantum mechanics. Recently Hardy's argument of non-locality has
been studied in the context of generalized non-signaling theory as well as
theory respecting information causality. Information causality condition
significantly reduces the success probability for Hardy's argument when
compared to the result based on non-signaling condition. Here motivated by the
fact that maximally entangled state in quantum mechanics does not exhibit
Hardy's non-local correlation, we do a qualitative study of the property of
local randomness of measured observable on each side reproducing Hardy's
non-locality correlation,in the context of information causality condition. On
applying the necessary condition for respecting the principle of information
causality, we find that there are severe restrictions on the local randomness
of measured observable in contrast to results obtained from no-signaling
condition.Still, there are some restrictions imposed by quantum mechanics that
are not obtained from information causality condition.Comment: 6 pages, 2 tables, new references adde
Excision of choledochal cyst in children by Roux-en-Y hepaticojejunostomy
The aim of this study was to review our experience of total excision with Roux-en-Y hepatico-jejunostomy for the surgical management of type I and type IVa choledochal cysts in 30 children. Among them, 22 were in type I and 8 in type IVa choledochal cysts. All had complete excision and Roux-en-Y hepaticojejunostomy with no morality. Morbidity consisted of prolong drainage (n=2) and late onset cholangitis/pancreatitis (n=4). Choledochal cyst generally has an excellent prognosis with early complete excision and Roux-en-Y hepaticojejunostomy
In situ annealing of superconducting MgB2 films prepared by pulsed laser deposition
The in situ annealing conditions of pulsed laser deposited MgB2 films were
studied. The precursor films were deposited at 250 C from a stoichiometric MgB2
target in a 120mTorr Ar atmosphere. The films were then in situ annealed at a
temperature from 450 C to 800 C and an annealing time from 1 minute to 10
minutes. We found that the superconducting properties depend in a crucial way
on the annealing conditions: temperature, heating rate and time. The best film
with a thickness of ~600nm was obtained under the following annealing
conditions: Tanneal=680-690 C, tanneal=1 min, heating rate= 38 C/min. The Tc
onset of the film is 28K with a transition width of ~10K. The hysteresis loop
of magnetic moment of the film indicates weak field dependence in high fields.
Magneto-optical imaging of the film showed quite homogeneous magnetic flux
penetration, indicating structural homogeneity. The films without annealing
showed no superconductivity.Comment: 12 pages, 6 figure
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