Photon counting detectors such as single-photon avalanche diode (SPAD) arrays can be employed to achieve reliable optical wireless communication at power limited regimes. However, SPAD-based receivers suffer from significant dead-time induced intersymbol interference (ISI) especially when the incident photon rate is relatively high and dead time comparable or even larger than symbol duration, i...

We report on the first implementation of a single-photon avalanche diode (SPAD) in 90nm complementary metal oxide semiconductor (CMOS) technology. The detector features an octagonal multiplication region and a guard ring to prevent premature edge breakdown using a standard mask set exclusively. The proposed structure emerged from a systematic study aimed at miniaturization, while optimizing ove...

The Gram-positive organism Corynebacterium diphtheriae, the cause of diphtheria in humans, expresses pili on its surface which it uses for adhesion and colonization of its host. These pili are covalent protein polymers composed of three types of pilin subunit that are assembled by specific sortase enzymes. A structural analysis of the major pilin SpaD, which forms the polymeric backbone of one ...

Remote sensing is a suitable tool for estimating the spatial variability of crop canopy characteristics, such as canopy chlorophyll content (CCC) and green ground cover (GGC%), which are often used for crop productivity analysis and site-specific crop management. Empirical relationships exist between different vegetation indices (VI) and CCC and GGC% that allow spatial estimation of canopy char...

this study investigated the effect of reciprocal teaching (rt) on efl learners’ reading comprehension. fifty intermediate learners participated in the study and were sampled as the experimental (n = 25) and control groups (n = 25). participants were male and ranged in age from 15 to 16. the reading section of key english test (ket, 2010) was used as the pretest to assess the participants’ entry...

In a 3-year experiment (2002-2004), five N rates (0, 60, 120, 180, 240 kg N ha-1) were applied to sugar beets arranged in a Randomized Complete Block design with six replications. Experimentation took place under the semi-arid, irrigated conditions of central Greece. The aim of this work was to study the late season response of sugar beet crop to N fertilization as assessed by non-destructive m...

Hydroponic systems have become increasingly popular for growers in recent years year-round local production. Whereas optimal air temperature plant growth has been considered, root zone temperatures not examined as thoroughly. The objective of this research was to determine the water growing different types basil hydroponically. Research conducted at greenhouses Stillwater, OK. Seventeen cultiva...

the present study attempted to introduce shared reading as one of the most effective techniques in cultivating the learners’ reading and writing abilities. to this end, 50 homogenous students were assigned to the control and experimental groups following the administration of a standardized english proficiency test. thenceforth, based on writing and reading pretest scores of the learners on a g...

Peanut is grown mostly in rainfed areas where drought is a recurring problem. Peanut genotypes with high transpiration efficiency (TE) use less water and produced yield better under drought conditions. Specific leaf area and SPAD chlorophyll meter reading are used as surrogate traits for TE. N2 fixation (NF) is also used as a surrogate trait for yield under drought. The objective of this study ...