نتایج جستجو برای: spad index

تعداد نتایج: 397153  

2013
M. I. Tajul M. M. Alam S. M. M. Hossain K. Naher M. Y. Rafii M. A. Latif

Field experiments were conducted to evaluate plant population and N-fertilizer effects on yield and yield components of maize (Zea mays L.). Three levels of plant populations (53000, 66000, and 800,000 plants ha⁻¹ corresponding to spacings of 75 × 25, 60 × 25, and 50 × 25 cm) and 4 doses of N (100, 140, 180, and 220 kg ha⁻¹) were the treatment variables. Results revealed that plant growth, ligh...

Journal: :Horticulturae 2023

In the Ericaceae family, blueberries are most commercially important species. Estimating nutritional and physiological status of plants is a common practice carried out by producers. However, conventional methods destructive, costly time consuming. recent years, methodologies such as measurements with SPAD chlorophyll index have become available, which has proven to be an easy, fast non-destruc...

J.T. Tsialtas, N. Maslaris

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...

Journal: :Journal of the Japan society of photogrammetry and remote sensing 2011

2015
X. Meng S. Xie X. Zhou C. H. Tan

Single photon detectors sensitive to near-infrared (NIR) wavelength light are used in an increasing number of applications, such as quantum key distribution, laser detection and ranging, and integrated circuit analysis. There are many types of NIR single photon detectors, e.g. photomultiplier tube, superconducting single photon detector and single photon avalanche diode (SPAD). However, the SPA...

Journal: :Optics letters 2013
Ying Mu Niksa Valim Mark Niedre

We tested the performance of a fast single-photon avalanche photodiode (SPAD) in measurement of early transmitted photons through diffusive media. In combination with a femtosecond titanium:sapphire laser, the overall instrument temporal response time was 59 ps. Using two experimental models, we showed that the SPAD allowed measurement of photon-density sensitivity functions that were approxima...

Journal: :Optics express 2012
Shingo Mandai Matthew W Fishburn Yuki Maruyama Edoardo Charbon

We present a single-photon avalanche diode (SPAD) with a wide spectral range fabricated in an advanced 180 nm CMOS process. The realized SPAD achieves 20 % photon detection probability (PDP) for wavelengths ranging from 440 nm to 820 nm at an excess bias of 4 V, with 30 % PDP at wavelengths from 520 nm to 720 nm. Dark count rates (DCR) are at most 5 kHz, which is 30 Hz/μm2, at an excess bias of...

2015
Istvan Gyongy Neale A.W. Dutton Luca Parmesan Amy Davies Rebecca Saleeb Rory Duncan Colin Rickman Paul Dalgarno Robert K. Henderson

Advances in SPAD sensor technology have recently yielded a >10kfps, 320x240 resolution imager [1] that can be operated as a Quanta Image Sensor (QIS) [2]. This device (labelled SPCImager) thus combines the high speed and sensitivity afforded by SPAD devices with the negligible readout noise and logarithmic compression of QIS. These attributes open the door to a number of potential applications ...

2003
Karen Wright David Embrey Martin Anderson

Now, more than at any other time in the history of the railways, there is an urgent need for the industry to learn lessons from near misses and incidents. In this first of two articles, we examine the extent to which the current procedures for gathering data on accidents such as SPADs provide support for the identification of underlying causes. An alternative approach is outlined, which we beli...

We studied the response of Elaeagnus rhamnoides (Sea Buckthorn) to drought stress in a nursery. Photosynthesis and chlorophyll content under drought were change rather modest. Growth and physiological differences in response to drought were compared between four Sea Buckthorn seedlings treatments inhabited in the Qazvin provenance origin seeds in Mashhad city of Iran. The experimental design in...

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