2,814 research outputs found
Reactive dynamics of inertial particles in nonhyperbolic chaotic flows
Anomalous kinetics of infective (e.g., autocatalytic) reactions in open,
nonhyperbolic chaotic flows are important for many applications in biological,
chemical, and environmental sciences. We present a scaling theory for the
singular enhancement of the production caused by the universal, underlying
fractal patterns. The key dynamical invariant quantities are the effective
fractal dimension and effective escape rate, which are primarily determined by
the hyperbolic components of the underlying dynamical invariant sets. The
theory is general as it includes all previously studied hyperbolic reactive
dynamics as a special case. We introduce a class of dissipative embedding maps
for numerical verification.Comment: Revtex, 5 pages, 2 gif figure
Rhabdomyolysis After Laparoscopic Nephrectomy
BACKGROUND AND OBJECTIVES: Laparoscopic renal surgery has become a widely applied technique in recent years. The development of postoperative rhabdomyolysis is a known but rare complication of laparoscopic renal surgery. Herein, 4 cases of rhabdomyolysis and a review of the literature are presented with respect to pathogenesis, treatment, and prevention of this dire complication. METHODS: A retrospective review of over 600 laparoscopic renal operations over the past 8 years was performed. All cases of postoperative rhabdomyolysis were identified. A Medline search was performed to find articles related to the development of postoperative rhabdomyolysis. Cases of rhabdomyolysis developing after laparoscopic renal surgery and common risk factors between cases were identified. RESULTS: The incidence of postoperative rhabdomyolysis in our series is 0.67%. It is similar to the rate reported in other series. Male sex, high body mass index, prolonged operative times, and the lateral decubitus position are all risk factors in its development. CONCLUSION: The prevention and optimal management of postoperative rhabdomyolysis following laparoscopic renal surgery has yet to be defined. The risk factors we identified should be carefully addressed and minimized. A better understanding of the pathogenesis of rhabdomyolysis will also be a key component in its prevention
Effects of the Methanol Extract of Basella alba L (Basellaceae) on Steroid Production in Leydig Cells
In this study, Leydig cells were purified from 70 day-old Sprague Dawley male rats and incubated with 10 and 100 μg/mL of methanol extract of Basella alba (MEBa) for 4 hours followed by the evaluation of cell viability, steroid (testosterone and estradiol) production, and the level of aromatase mRNA. Results showed that MEBa did not affect Leydig cell viability. At the concentration of 10 μg/mL, MEBa significantly stimulated testosterone and estradiol production (p < 0.01 and p < 0.03, respectively), and enhanced aromatase mRNA level (p < 0.04). These observations suggest that MEBa directly stimulated testosterone, estradiol and aromatase mRNA levels in isolated Leydig cells
Asymptotics of unitary and othogonal matrix integrals
In this paper, we prove that in small parameter regions, arbitrary unitary
matrix integrals converge in the large limit and match their formal
expansion. Secondly we give a combinatorial model for our matrix integral
asymptotics and investigate examples related to free probability and the HCIZ
integral. Our convergence result also leads us to new results of smoothness of
microstates. We finally generalize our approach to integrals over the othogonal
group.Comment: 41 pages, important modifications, new section about orthogonal
integral
Ahnas El Medineh: The Tomb of Paheri at El Kab
Memoir of two excavations at Ahnas.https://knowledge.e.southern.edu/kweeks_coll/1036/thumbnail.jp
description and performance
We developed a coupled regional climate system model based on the CCLM
regional climate model. Within this model system, using OASIS3-MCT as a
coupler, CCLM can be coupled to two land surface models (the Community Land
Model (CLM) and VEG3D), the NEMO-MED12 regional ocean model for the
Mediterranean Sea, two ocean models for the North and Baltic seas (NEMO-NORDIC
and TRIMNP+CICE) and the MPI-ESM Earth system model. We first present the
different model components and the unified OASIS3-MCT interface which handles
all couplings in a consistent way, minimising the model source code
modifications and defining the physical and numerical aspects of the
couplings. We also address specific coupling issues like the handling of
different domains, multiple usage of the MCT library and exchange of 3-D
fields. We analyse and compare the computational performance of the different
couplings based on real-case simulations over Europe. The usage of the LUCIA
tool implemented in OASIS3-MCT enables the quantification of the contributions
of the coupled components to the overall coupling cost. These individual
contributions are (1) cost of the model(s) coupled, (2) direct cost of
coupling including horizontal interpolation and communication between the
components, (3) load imbalance, (4) cost of different usage of processors by
CCLM in coupled and stand-alone mode and (5) residual cost including i.a. CCLM
additional computations. Finally a procedure for finding an optimum processor
configuration for each of the couplings was developed considering the time to
solution, computing cost and parallel efficiency of the simulation. The
optimum configurations are presented for sequential, concurrent and mixed
(sequential+concurrent) coupling layouts. The procedure applied can be
regarded as independent of the specific coupling layout and coupling details.
We found that the direct cost of coupling, i.e. communications and horizontal
interpolation, in OASIS3-MCT remains below 7 % of the CCLM stand-alone cost
for all couplings investigated. This is in particular true for the exchange of
450 2-D fields between CCLM and MPI-ESM. We identified remaining limitations
in the coupling strategies and discuss possible future improvements of the
computational efficiency
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