3,376 research outputs found
Evolution Of Special Ruled Surfaces Via The Evolution Of Their Directrices In Euclidean 3-Space E3
In this paper, evolutions of ruled surfaces that are generated by the normal and binormal vector fields of space curve (normal and binormal surfaces) are presented. These evolutions of the ruled surfaces depend on the evolutions of their directrices. Geometric visualization of these ruled surfaces are presented. In addition, the conditions which make these surfaces of types inextensible, developable and minimal are obtained
Stream Fusion, to Completeness
Stream processing is mainstream (again): Widely-used stream libraries are now
available for virtually all modern OO and functional languages, from Java to C#
to Scala to OCaml to Haskell. Yet expressivity and performance are still
lacking. For instance, the popular, well-optimized Java 8 streams do not
support the zip operator and are still an order of magnitude slower than
hand-written loops. We present the first approach that represents the full
generality of stream processing and eliminates overheads, via the use of
staging. It is based on an unusually rich semantic model of stream interaction.
We support any combination of zipping, nesting (or flat-mapping), sub-ranging,
filtering, mapping-of finite or infinite streams. Our model captures
idiosyncrasies that a programmer uses in optimizing stream pipelines, such as
rate differences and the choice of a "for" vs. "while" loops. Our approach
delivers hand-written-like code, but automatically. It explicitly avoids the
reliance on black-box optimizers and sufficiently-smart compilers, offering
highest, guaranteed and portable performance. Our approach relies on high-level
concepts that are then readily mapped into an implementation. Accordingly, we
have two distinct implementations: an OCaml stream library, staged via
MetaOCaml, and a Scala library for the JVM, staged via LMS. In both cases, we
derive libraries richer and simultaneously many tens of times faster than past
work. We greatly exceed in performance the standard stream libraries available
in Java, Scala and OCaml, including the well-optimized Java 8 streams
Low uptake of antiretroviral therapy after admission with human immunodeficiency virus and tuberculosis in KwaZulu-Natal, South Africa.
A prospective cohort study was conducted among human immunodeficiency virus (HIV) infected in-patients with tuberculosis (TB) or other opportunistic infections (OIs) in South Africa to estimate subsequent antiretroviral therapy (ART) uptake and survival
Analisis Pendapatan dan Kelayakan USAha Industri Minyak Nilam di Desa Lumbutarombo Kecamatan Banawa Selatan Kabupaten Donggala
This study aims to determine the feasibility and income on Patchouli Oil Industry at the Village Lumbutarombo Donggala District of South Banawa. This research was conducted in the village of Lumbutarombo in September 2015. The determination of the respondents in this research was intentionally (purposive), selected respondents were higher rank staff and employees of Patchouli Oil Industry. The data used in this study derived from primary data and secondary data. The analysis was done for income and feasibility of this industry. The results showed that income per month patchouli oil industry was 15,950,375 IDR and the Patchouli Industry is feasible with 1.18 as R/C value
Interaction of Nonlinear Schr\"odinger Solitons with an External Potential
Employing a particularly suitable higher order symplectic integration
algorithm, we integrate the 1- nonlinear Schr\"odinger equation numerically
for solitons moving in external potentials. In particular, we study the
scattering off an interface separating two regions of constant potential. We
find that the soliton can break up into two solitons, eventually accompanied by
radiation of non-solitary waves. Reflection coefficients and inelasticities are
computed as functions of the height of the potential step and of its steepness.Comment: 14 pages, uuencoded PS-file including 10 figure
A note on the integrable discretization of the nonlinear Schr\"odinger equation
We revisit integrable discretizations for the nonlinear Schr\"odinger
equation due to Ablowitz and Ladik. We demonstrate how their main drawback, the
non-locality, can be overcome. Namely, we factorize the non-local difference
scheme into the product of local ones. This must improve the performance of the
scheme in the numerical computations dramatically. Using the equivalence of the
Ablowitz--Ladik and the relativistic Toda hierarchies, we find the
interpolating Hamiltonians for the local schemes and show how to solve them in
terms of matrix factorizations.Comment: 24 pages, LaTeX, revised and extended versio
Ibrutinib-associated sever skin toxicity: A case of multiple inflamed skin lesions and cellulitis in a 68-year-old male patient with relapsed chronic lymphocytic leukemia Case report and literature review
Introduction: Ibrutinib is an oral inhibitor of Bruton's tyrosine kinase that is used for a variety of B cell hematological malignancies. Skin and subcutaneous tissue manifestations have been reported and were witnessed in up to 32% of the patients on ibrutinib. The mechanism in which ibrutinib can cause skin toxicities has been thought due to the inhibition of epidermal growth factor; c-Kit and platelet-derived growth factor receptor). Here, we report a case of an elderly chronic lymphocytic leukemia patient who developed multiple inflamed lesions and lower limb cellulitis in 100 days after initiating ibrutinib therapy. Case report: A 68-year-old male patient with relapsed chronic lymphocytic leukemia was started on ibrutinib 420 mg orally daily following multiple lines of therapy. Three months following ibrutinib, the patient developed multiple hyper pigmented lesions over both forearms then over both thighs; buttocks and lower limbs. The lesions were labeled as ecthyma and cellulitis that started as papules, which progressed to pustules. Management and outcomes: The patient required admission in which he received prolonged course of antibiotics. Biopsy from the wound showed soft tissue fragment infiltrated by acute and chronic inflammatory cells with necrosis; rare foreign body giant cells and granulation tissue formation; suggestive of abscess. Subsequently, ibrutinib was stopped permanently. Discussion: This is the first case description of an ibrutinib-associated sever skin toxicity in Qatar. The provided information regarding the clinical descriptions of toxicity profiles in general and skin-based in particular is valuable information for daily clinical practice, especially when selecting the optimum first-line treatment for the patient.Scopu
Design and analysis of a novel concentric rings based crossed lines single negative metamaterial structure
AbstractThis paper presents the design and analysis of a novel single negative metamaterial (MTM) based on concentric rings with crossed lines (CR-CL) to be miniaturized to λ/4 at 15GHz. The unit cell is structured to behave as a single negative MTM, -ε or -μ, at different frequency bands. The unit cell is consistent of a dielectric substrate, 5×5×1mm3, of FR4-Epoxy underneath of a conductive patch designed as 4.4×4.4mm2. A complete analysis in terms of S-parameters, constitutive parameters and refraction index are evaluated for the unit cell using both full wave simulation and circuitry analysis as well. Nevertheless, the unit cell characteristics based circuit equivalent lumped components are retrieved. HFSS software package based on Finite Element Method (FEM) and Advanced Design System (ADS) based on circuit analysis formulations are invoked to perform the simulation study. Later on, the obtained simulation results are compared to their identical measurements based on transmission line technique. Finally, the simulated and measured results are agreed excellently
The Effect of Nano–Micro Silica Mixture on the Shear Strength of Reinforced Concrete Beams
This paper examines the significance of nano silica and micro silica mixture on the shear strength of reinforced concrete beams. The nano and micro silica mixture was used as a partial replacement for Portland cement with different proportions to produce four (4) concrete mixtures. In this research, the tests on fresh concrete mixtures (slump test, density test and air content test) were performed. The compressive strength of concrete mixtures was tested. The shear strength of reinforced concrete beams with and without shear reinforcement is examined. Moreover, the influence of the multi-sized silica mixture on other mechanical characteristics of concrete related to the shear behavior of concrete beams, shear crack width, the inclination angle of shear cracks and deflection were also examined. From test results, the mixture of 2% nano silica with 8% micro silica was found to lead to the highest compressive strength, it improve the concrete compressive strength up to 33% compared with control specimens. The shear strength of the concrete beam incorporating 8% micro silica and 2% nano silica mixture was also improved, it increased by 30% and 59 % for beams with and without steel stirrups, respectively. The significance of nano-micro silica mixture on the concrete contribution to the shear strength of reinforced concrete beams is examined. The nano-micro silica mixture increased concrete contribution to shear strength of reinforced concrete beams up to 17%
Reconnection and acoustic emission of quantized vortices in superfluid by the numerical analysis of the Gross-Pitaevskii equation
We study numerically the reconnection of quantized vortices and the
concurrent acoustic emission by the analysis of the Gross-Pitaevskii equation.
Two quantized vortices reconnect following the process similar to classical
vortices; they approach, twist themselves locally so that they become
anti-parallel at the closest place, reconnect and leave separately.The
investigation of the motion of the singular lines where the amplitude of the
wave function vanishes in the vortex cores confirms that they follow the above
scenario by reconnecting at a point. This reconnection is not contradictory to
the Kelvin's circulation theorem, because the potential of the superflow field
becomes undefined at the reconnection point. When the locally anti-parallel
part of the vortices becomes closer than the healing length, it moves with the
velocity comparable to the sound velocity, emits the sound waves and leads to
the pair annihilation or reconnection; this phenomena is concerned with the
Cherenkov resonance. The vortices are broken up to smaller vortex loops through
a series of reconnection, eventually disappearing with the acoustic emission.
This may correspond to the final stage of the vortex cascade process proposed
by Feynman. The change in energy components, such as the quantum, the
compressible and incompressible kinetic energy is analyzed for each dynamics.
The propagation of the sound waves not only appears in the profile of the
amplitude of the wave function but also affects the field of its phase,
transforming the quantum energy due to the vortex cores to the kinetic energy
of the phase field.Comment: 11 pages, 16 figures, LaTe
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