A5073144205- Nonlinear Waves and Solitons
- Nonlinear Photonic Systems
- Solar Thermal and Photovoltaic Systems
- Particle physics theoretical and experimental studies
- Quantum Chromodynamics and Particle Interactions
- High-Energy Particle Collisions Research
- Algal biology and biofuel production
- Photovoltaic System Optimization Techniques
- Nonlinear Dynamics and Pattern Formation
- Solar Radiation and Photovoltaics
- Advanced Mathematical Physics Problems
- Building Energy and Comfort Optimization
- Differential Equations and Numerical Methods
- Quantum chaos and dynamical systems
- Advanced Fiber Laser Technologies
- Photosynthetic Processes and Mechanisms
- Numerical methods for differential equations
- Quantum Mechanics and Non-Hermitian Physics
- Advanced Thermodynamics and Statistical Mechanics
- Aquatic Ecosystems and Phytoplankton Dynamics
- Scientific Research and Discoveries
- Black Holes and Theoretical Physics
- Light effects on plants
- Biocrusts and Microbial Ecology
- Spectroscopy and Quantum Chemical Studies
Ben-Gurion University of the Negev
2015-2025
State University of New York
1987-1993
Stony Brook University
1987-1990
Case Western Reserve University
1982
Weizmann Institute of Science
1968-1981
Technion – Israel Institute of Technology
1978
Bielefeld University
1974-1978
Deutsches Elektronen-Synchrotron DESY
1976
European Organization for Nuclear Research
1973-1974
University of Helsinki
1974
A new model for vegetation patterns is introduced. The reproduces a wide range of observed in water-limited regions, including drifting bands, spots, and labyrinths. It predicts transitions from bare soil at low precipitation to homogeneous high precipitation, through intermediate states spot, stripe, hole patterns. also ranges where different stable coexist. Using these predictions we propose novel explanation desertification phenomena approach classifying aridity.
Allelic richness (number of alleles) is a measure genetic diversity indicative population's long-term potential for adaptability and persistence. It used less commonly than heterozygosity as measure, partially because it more mathematically difficult to take into account the stochastic process drift allelic richness. This paper presents model newly founded population experiencing gene flow. The follows dynamics alleles lost during founder event simulates effect flow on maintenance recovery...
The requirements for efficient utilization of high light fluxes in cultures Spirulina platensis have previously been elucidated. most important these was a short light-path coupled with highly turbulent flow, facilitating ultrahigh cell densities (i.e. above 100 mg chl l−1). present study shows that each irradiance there is an optimal culture density, defined as the concentration yields highest output rate mass under prevailing conditions. In density cultures, linear relationship observed...
The conjecture on the role played by Pomeranchuk singularity in finite-energy sum-rule (FESR) calculations and within duality framework is reviewed subjected to various experimental tests. It assumed that FESR sense Pomeranchon built from nonresonating background contributions, while all other trajectories are constructed $s$-channel resonances. Previous results based this first. A detailed model for $\ensuremath{\pi}N$ elastic scattering then compared with experiment. All $I=1$ $t$-channel...
We show that the resonance-dominance approximation for low-energy part of finite-energy sum rules $C=+1$, $I=0$ $t$-channel $\ensuremath{\pi}N$ and $\mathrm{KN}$ elastic amplitudes reproduces correctly properties ${P}^{\ensuremath{'}}$ trajectory residue functions. The Pomeranchukon is fully accounted by background. Gell-Mann ghost-eliminating mechanism favored trajectory.
Despite the complexity of photosynthetic system, a simple explanation is proposed for photon-flux density dependence P–I curves (biomass production rate versus flux density) and electron transfer (delivery excited electrons from PS II, first stage process, to second stage, I, density). It shown that these two entities direct consequence stochastic nature photon arrival times on chlorophyll antenna existence rate-limiting time scale about 10 ms in operation photosystem, magnitude average...
We present experimental results demonstrating that, relative to continuous illumination, an increase of a factor 3–10 in the photon efficiency algal photosynthesis is attainable via judicious application pulsed light for intensities practical interest (e.g., average-to-peak solar irradiance). also propose simple model that can account all measurements. The (1) reflects essential rate-limiting elements bioproductivity, (2) incorporates impact arrival-time statistics, and (3) accounts how...
An upper bound on annual average energy in the Earth’s winds is calculated via formalism of finite-time thermodynamics. The atmosphere viewed as working fluid a heat engine where input solar radiation, rejection to surrounding universe, and work output winds. for power found be 17 W/m2, which can contrasted with actual estimated wind 7 W/m2. Our thermodynamic model also predicts extreme temperatures applied systems other planets.
Cultivating algae at high densities in thin photobioreactors engenders time scales for random cell motion that approach photosynthetic rate-limiting scales. This synchronization allows bioproductivity above achieved with conventional strategies. We show a diffusion model (1) accounts irradiance values previously deemed restricted by photoinhibition, (2) predicts the existence of optimal culture and their dependence on irradiance, consistent available data, (3) observed degree to which mixing...
Experiments on ultrahigh density unicellular algae cultures in thin flat-plate bioreactors (thickness ≤2 cm) indicate that: i) Optimal areal biomass production rates are significantly higher than traditional ponds or raceways, ii) productivity grows for radiation levels substantially one sun; saturation emerging, possibly, at intensities of about four suns, and iii) optimal volumetric as well culture densities increase reactor thickness is reduced. The observations reproduced within the...
Experiments have shown that photon exploitation efficiency in unicellular algal biomass production under a pulsed-light regime with high-photon flux is higher than the continuous illumination same flux. This observation has been explained theoretically to be consequence of improved photons by Photosystem II (PS II) thanks combined effect photon-absorption statistics, rate-limiting time scale and size PQ pool. Exploiting ideas, it this paper that, regime, there pulse-time length, for which...