Abstract For the traditional PV maximum power tracking control method in terms of speed and stability, proposed an improved variable-step incremental conductance method. The first speeds up by constant voltage coefficient to quickly locate around MPP(Maximum point,MPP) dynamically adjusts step size using inverse tangent function value when operating point is located left point, exponential righ...

The internal conductance to CO2 supply from substomatal cavities to sites of carboxylation poses a large limitation to photosynthesis. It is known that internal conductance is decreased by soil water deficits, but it is not known if it is affected by atmospheric water deficits (i.e. leaf to air vapour pressure deficit, VPD). The aim of this paper was to examine the responses of internal conduct...

Whole-body plethysmograph measurements and challenge inhalation of carbachol were combined to assess asthmatic changes longitudinally. Airway conductance proved to be relatively stable over a 10-week period in 3 normal subjects. Five asthmatics showed periodically lower conductance and greater variability. Periods of low conductance at times could be observed to precede other manifestations of ...

This review is intended to give a pedagogical and unified view on the subject of the statistics and scaling of physical quantities in disordered electron systems at very low temperatures. Quantum coherence at low temperatures and randomness of microscopic details can cause large fluctuations of physical quantities. In such mesoscopic systems a localization-delocalization transition can occur wh...

Hodgkin-Huxley (HH) equation is the first cell computing model in the world and pioneered the use of model to study electrophysiological problems. The model consists of four differential equations which are based on the experimental data of ion channels. Maximal conductance is an important characteristic of different channels. In this study, mathematical method is used to investigate the import...

Maximum power point tracking (MPPT) is one of the key functions of the solar power management system in solar energy deployment. This paper investigates the design of fuzzy-logic-based solar power MPPT algorithms using different fuzzy input variables. Six fuzzy MPPT algorithms, based on different input variables, were considered in this study, namely (i) slope (of solar power-versus-solar volta...

This paper describes the improved performance of an asynchronous motor drive with a new modified Incremental conductance-based MPPT controller. In last few decades, renewable energy sources are playing dominant role in electricity generation as non-renewable becoming extinguish and major cause global warming. Photovoltaic (PV) is most important resource since it clean, pollution-free, inexhaust...

We studied the effect of scion donor-tree age on the physiology and growth of 6- to 7-year-old grafted Scots pine (Pinus sylvestris L.) trees (4 and 5 years after grafting). Physiological measurements included photosynthethetic rate, stomatal conductance, transpiration, whole plant hydraulic conductance, needle nitrogen concentration and carbon isotope composition. Growth measurements included ...