26,009 research outputs found
A projective Dirac operator on CP^2 within fuzzy geometry
We propose an ansatz for the commutative canonical spin_c Dirac operator on
CP^2 in a global geometric approach using the right invariant (left action-)
induced vector fields from SU(3). This ansatz is suitable for noncommutative
generalisation within the framework of fuzzy geometry. Along the way we
identify the physical spinors and construct the canonical spin_c bundle in this
formulation. The chirality operator is also given in two equivalent forms.
Finally, using representation theory we obtain the eigenspinors and calculate
the full spectrum. We use an argument from the fuzzy complex projective space
CP^2_F based on the fuzzy analogue of the unprojected spin_c bundle to show
that our commutative projected spin_c bundle has the correct
SU(3)-representation content.Comment: reduced to 27 pages, minor corrections, minor improvements, typos
correcte
Developing a Phosphorus Fertilizer Training Program for Golf Course Personnel
A new Extension program has been developed in Minnesota to train golf course personnel on managing phosphorus inputs in response to recently passed legislation restricting the use of P fertilizers applied to turfgrass. This article introduces the P legislation passed in Minnesota, describes the curriculum, and discusses survey responses from golf course personnel who have participated in the program. The data presented indicate that respondents found the program either useful or very useful with respect to the day-to-day management of P fertilizers applied to turf
a touch of gastronomy
The last few years have seen a rapid growth of research interest in the study of the role of touch and oral-somatosensation in the experience of eating and drinking. The various ways in which the sense of touch can be used to enhance the diner's/consumer's experience in both everyday eating and drinking, as well as in the context of experiential dining, is also gaining ever more attention from professionals in a variety of disciplines. In this review, we highlight the importance that everything that we perceive via the sense of touch, from the weight of the menu to the feel of the tablecloth, tableware, cutlery, and even the food itself, has on our eating experience and food and beverage-related behaviors. Everything we feel, be it the weight, the temperature, or the texture of whatever we happen to come across while eating appears to matter. In addition, we also highlight the relevance of oral-somatosensory cues to our sensory and hedonic perception of foods. A number of examples are given to demonstrate some of the many ways in which chefs, designers, and artists are now exploiting these findings in order to change and, hopefully, to enhance the diner's eating experience in innovative ways
Obstetric Outcome in Grandmultiparous Women in Jos University Teaching Hospital
Background: The grandmultipara is traditionally regarded in Obstetrics as a high risk in pregnancy. However, some authors believe that if matched for age and socioeconomic status in a setting of satisfactory health care conditions, grandmultiparity should not be considered dangerous. This study determined the maternal morbidity and mortality and perinatal outcomes associated with grandmultiparity among women who came to deliver in Jos University Teaching Hospital.Method: This hospital based prospective case control study was carried out between June 2008 and January 2009 in the labour ward of the maternity unit of Jos University Teaching Hospital among 250 consecutive grandmultiparous women and another 250 consecutive women of parity 2 to 4 who were matched for age and socioeconomic status.Result: The 250 grandmultiparous women and their matched multiparous group had an average age of 32.9 ± 4.6 years. Grandmultiparous women were significantly more likely to develop hypertensive disease in pregnancy, have malpresentaion and develop postpartum haemorrhage. Their fetuses were significantly more likely to have fetal distress in labour, to be low birth weight babies and be admitted to the special care baby unit (SCBU).Conclusion: In the developing countries where the health care delivery system is still facing a lot of challenges, the grandmultipara should still be considered a high risk in pregnancy
The compact, âŒ1 kpc host galaxy of a quasar at a redshift of 7.1
We present Atacama Large Millimeter/submillimeter Array (ALMA) observations of the [C ii] fine-structure line and the underlying far-infrared (FIR) dust continuum emission in J1120+0641, the most distant quasar currently known (). We also present observations targeting the CO(2â1), CO(7â6), and [C i] 369 ÎŒm lines in the same source obtained at the Very Large Array and Plateau de Bure Interferometer. We find a [C ii] line flux of Jy and a continuum flux density of mJy beamâ1, consistent with previous unresolved measurements. No other source is detected in continuum or [C ii] emission in the field covered by ALMA (~ 25''). At the resolution of our ALMA observations (0farcs23, or 1.2 kpc, a factor of ~70 smaller beam area compared to previous measurements), we find that the majority of the emission is very compact: a high fraction (~80%) of the total line and continuum flux is associated with a region 1â1.5 kpc in diameter. The remaining ~20% of the emission is distributed over a larger area with radius lesssim4 kpc. The [C ii] emission does not exhibit ordered motion on kiloparsec scales: applying the virial theorem yields an upper limit on the dynamical mass of the host galaxy of , only ~20 Ă higher than the central black hole (BH). The other targeted lines (CO(2â1), CO(7â6), and [C i]) are not detected, but the limits of the line ratios with respect to the [C ii] emission imply that the heating in the quasar host is dominated by star formation, and not by the accreting BH. The star formation rate (SFR) implied by the FIR continuum is 105â340 , with a resulting SFR surface density of ~100â350 kpcâ2, well below the value for Eddington-accretion-limited star formation
Grynfeltt Hernia (GH): A Rare Case of Hernia
Grynfeltt hernia (GH) is extremely rare among all abdominal wall hernias, so both diagnosis and treatment can be challenging. Surgery, open or laparoscopic, is the only definitive treatment. We present a case of a 71-year-old woman with GH (initially misdiagnosed as a lipoma), its approach, and treatment. We performed a hernioplasty with two meshes (preperitoneal and subaponeurotic position) by an open approach: Sandwich technique. This technique is safe, feasible, and associated with no short-term complications or relapses.info:eu-repo/semantics/publishedVersio
Radiation reaction and energy-momentum conservation
We discuss subtle points of the momentum balance for radiating particles in
flat and curved space-time. An instantaneous balance is obscured by the
presence of the Schott term which is a finite part of the bound field momentum.
To establish the balance one has to take into account the initial and final
conditions for acceleration, or to apply averaging. In curved space-time an
additional contribution arises from the tidal deformation of the bound field.
This force is shown to be the finite remnant from the mass renormalization and
it is different both form the radiation recoil force and the Schott force. For
radiation of non-gravitational nature from point particles in curved space-time
the reaction force can be computed substituting the retarded field directly to
the equations of motion. Similar procedure is applicable to gravitational
radiation in vacuum space-time, but fails in the non-vacuum case. The existence
of the gravitational quasilocal reaction force in this general case seems
implausible, though it still exists in the non-relativistic approximation. We
also explain the putative antidamping effect for gravitational radiation under
non-geodesic motion and derive the non-relativistic gravitational quadrupole
Schott term. Radiation reaction in curved space of dimension other than four is
also discussedComment: Lecture given at the C.N.R.S. School "Mass and Motion in General
Relativity", Orleans, France, 200
Calculating Unknown Eigenvalues with a Quantum Algorithm
Quantum algorithms are able to solve particular problems exponentially faster
than conventional algorithms, when implemented on a quantum computer. However,
all demonstrations to date have required already knowing the answer to
construct the algorithm. We have implemented the complete quantum phase
estimation algorithm for a single qubit unitary in which the answer is
calculated by the algorithm. We use a new approach to implementing the
controlled-unitary operations that lie at the heart of the majority of quantum
algorithms that is more efficient and does not require the eigenvalues of the
unitary to be known. These results point the way to efficient quantum
simulations and quantum metrology applications in the near term, and to
factoring large numbers in the longer term. This approach is architecture
independent and thus can be used in other physical implementations
Matrix models on the fuzzy sphere
Field theory on a fuzzy noncommutative sphere can be considered as a
particular matrix approximation of field theory on the standard commutative
sphere. We investigate from this point of view the scalar theory. We
demonstrate that the UV/IR mixing problems of this theory are localized to the
tadpole diagrams and can be removed by an appropiate (fuzzy) normal ordering of
the vertex. The perturbative expansion of this theory reduces in the
commutative limit to that on the commutative sphere.Comment: 6 pages, LaTeX2e, Talk given at the NATO Advanced Research Workshop
on Confiment, Topology, and other Non-Perturbative Aspects of QCD, Stara
Lesna, Slovakia, Jan. 21-27, 200
A Similarity Measure for GPU Kernel Subgraph Matching
Accelerator architectures specialize in executing SIMD (single instruction,
multiple data) in lockstep. Because the majority of CUDA applications are
parallelized loops, control flow information can provide an in-depth
characterization of a kernel. CUDAflow is a tool that statically separates CUDA
binaries into basic block regions and dynamically measures instruction and
basic block frequencies. CUDAflow captures this information in a control flow
graph (CFG) and performs subgraph matching across various kernel's CFGs to gain
insights to an application's resource requirements, based on the shape and
traversal of the graph, instruction operations executed and registers
allocated, among other information. The utility of CUDAflow is demonstrated
with SHOC and Rodinia application case studies on a variety of GPU
architectures, revealing novel thread divergence characteristics that
facilitates end users, autotuners and compilers in generating high performing
code
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