The Experts below are selected from a list of 288 Experts worldwide ranked by ideXlab platform
Brandon Cochenour - One of the best experts on this subject based on the ideXlab platform.
-
A MEMS blue/green retroreflecting modulator for underwater optical communications
OCEANS 2010 MTS IEEE SEATTLE, 2010Co-Authors: William C. Cox, Brandon Cochenour, Kory F. Gray, Jim A. Simpson, Brian L. Hughes, John F. MuthAbstract:Short range, high bandwidth underwater optical communications links are potentially useful for retrieving stored information from underwater systems. However many underwater systems have limited power capacity or limited weight budget. The use of a modulating retroreflector eliminates the need for a transmitting laser on the data bearing platform and reduces the pointing requirements by retroreflecting the modulated light back to the interrogating source. Blue/green operation of a MEMS Fabry-Perot modulator was demonstrated at data rates of 500 kbps and 1 Mbps in a 7.7 meter tank with water conditions varied by the addition of Maalox as a scattering agent.
-
effect of scattering albedo on attenuation and polarization of light underwater
Optics Letters, 2010Co-Authors: Brandon Cochenour, Linda Mullen, J F MuthAbstract:Recent work on underwater laser communication links uses polarization discrimination to improve system performance [Appl. Opt.48, 328 (2009)] [in Proceedings of IEEE Oceans 2009 (IEEE, 2009), pp. 1–4]. In the laboratory, Maalox antacid is commonly used as a scattering agent. While its scattering function closely mimics that of natural seawaters, its scattering albedo can be much higher, as Maalox particles tend to be less absorbing. We present a series of experiments where Nigrosin dye is added to Maalox in order to more accurately recreate real-world absorption and scattering properties. We consider the effect that scattering albedo has on received power and the degree of depolarization of forward-scattered light in the context of underwater laser communication links.
Muhammad Riaz - One of the best experts on this subject based on the ideXlab platform.
-
Investigating The Performance Of Underwater Wireless Optical Communication with Intensity Modulation Direct Detection Technique
Light Energy and the Environment, 2017Co-Authors: Salah A. Adnan, Mazin Ali A. Ali, Ahmed C. Kadhim, Maha Sadeq, Muhammad RiazAbstract:In this paper, the BER and losses are inspected experimentally in an underwater optical wireless communication system (UWOC) with different water types. Results show that salt and Maalox content increase BER and power losses.
-
Investigating Link Budget of Underwater Wireless Optical Communication with Intensity Modulation Direct Detection Technique
Light Energy and the Environment, 2017Co-Authors: Salah A. Adnan, Mazin Ali A. Ali, Ahmed C. Kadhim, Maha Sadeq, Muhammad RiazAbstract:In this paper, we experimentally investigated power and S/N of error-free underwater wireless optical communication (UWOC) system over 7m link in laboratory tap water. Results show that salt and Maalox content decreases the received power.
J F Muth - One of the best experts on this subject based on the ideXlab platform.
-
effect of scattering albedo on attenuation and polarization of light underwater
Optics Letters, 2010Co-Authors: Brandon Cochenour, Linda Mullen, J F MuthAbstract:Recent work on underwater laser communication links uses polarization discrimination to improve system performance [Appl. Opt.48, 328 (2009)] [in Proceedings of IEEE Oceans 2009 (IEEE, 2009), pp. 1–4]. In the laboratory, Maalox antacid is commonly used as a scattering agent. While its scattering function closely mimics that of natural seawaters, its scattering albedo can be much higher, as Maalox particles tend to be less absorbing. We present a series of experiments where Nigrosin dye is added to Maalox in order to more accurately recreate real-world absorption and scattering properties. We consider the effect that scattering albedo has on received power and the degree of depolarization of forward-scattered light in the context of underwater laser communication links.
K K Juma - One of the best experts on this subject based on the ideXlab platform.
-
effects of Maalox plusaâ antacid and purecalaâ calcium supplements on haematological and biochemical parameters of rats subjected to alcoholintoxication
Journal of alcoholism and drug dependence, 2017Co-Authors: T O Onyango, D N Mburu, M P Ngugi, J K Kamau, K K JumaAbstract:Habitual intake of alcohol is associated with health complications including depletion of the body’s stores of magnesium and calcium. In chronic alcoholism, treatment with magnesium and calcium has shown to normalize elevated enzyme activities and clinically relevant parameters. This study examined the effects of Maalox plus® antacid and PureCal® calcium which are rich in magnesium and calcium, respectively, on the haematological and biochemical profiles of rats exposed to acute alcohol intoxication. Alcohol was administered orally at a dosage 5 g/kg body weight for five days and supplements for two days of the week in duration of 28 days. Haematological and biochemical profiles were determined using automated analyzer. Statistical comparison was done using one way ANOVA followed by Tukey’s test. Alcohol caused neutrophilia, eosinophilia and basopenia. Maalox plus® and PureCal® were ineffective against neutrophilia but effective in normalizing eosinophilia. Basopenia was normalized by 4.25 mg/kg magnesium and calcium at 4.25 mg/kg and 8.5 mg/kg. Macrocytic anaemia was another alcohol disorder that was reversed by Maalox plus® and PureCal® except in animals given 8.5 mg/kg Mg and those cotreated with Ca and Mg. The alcohol induced thrombocytopenia was unaffected by the drugs. Alcohol did not significantly affect liver enzymes, lipids, creatinine and BUN levels. However, the drugs lowered BUN levels in animals given 8.5 mg/kg Mg, 4.25 mg/kg calcium and those co-treated with calcium and magnesium. Alcohol did not influence serum levels of Mg2+ but it significantly increased Ca2+ and lowered K+. Maalox plus® and PureCal® normalized the hypercalcemia in a dose-dependent manner. Alcohol induced hypokalemia was normalized by 4.25 mg/kg Mg and 17 mg mg/kg Ca. Maalox plus® and PureCal® had alleviated the alcohol induced adverse effects. These findings suggest that the drugs are useful agents that could have applications in the management of adverse effects associated with acute alcohol intoxication.
-
effects of Maalox plus antacid and purecal calcium supplement on physical characteristics body weight tissue minerals and histopathology of rats subjected to alcohol intoxication
Clinical and Experimental Pharmacology, 2017Co-Authors: T O Onyango, D N Mburu, M P Ngugi, J K Kamau, K K JumaAbstract:Overconsumption of alcohol is associated with morbidity including depletion of the body’s stores of magnesium and calcium. Conversely therapy with magnesium (Mg) and calcium (Ca) in the event of chronic alcoholism normalizes elevated enzyme activities. Similar information on acute alcohol intoxication is missing. This study examined the effects of Maalox plus® antacid and pureCal® calcium supplement which are rich in Mg and Ca, respectively, on the body weight, tissue magnesium and calcium together with histopathology of rats exposed to acute alcohol intoxication. Alcohol was administered orally at a dosage 5 g/kg body weight for five days and supplements for two days of the week for duration of 28 days. The animals were weighed weekly and tissues obtained at the end of the treatment regimen. Statistical comparison was done using one way ANOVA followed by Tukey’s test. Alcohol ingestion leads to hypomagnesemia a condition that was reversed by both drugs. Liver histology showed that alcohol caused cellular infiltration and cytoplasmic vacuolization. For kidney there was cellular infiltration and widening of tubules. Visible improvement of the liver histology architecture was discernible in rats cotreated with Ca and Mg. These results showed that alcohol altered tissue architecture and the renal cation exchange mechanism as shown by the variation in serum Ca2 and K levels. Maalox plus® and pureCal® alleviated the alcohol induced adverse effects. These findings allude to these drugs being useful agents with potential applications in the management of adverse effects associated with acute alcohol intoxication.
Pengfei Tian - One of the best experts on this subject based on the ideXlab platform.
-
absorption and scattering effects of Maalox chlorophyll and sea salt on a micro led based underwater wireless optical communication invited
Chinese Optics Letters, 2019Co-Authors: Pengfei Tian, Shuailong Zhang, Honglan Chen, Zeyuan Qian, Gufan Zhou, Xinwei Chen, Xiaolin Zhou, Jie Lu, Peiyao Wang, Zhilai FangAbstract:In this work, a blue gallium nitride (GaN) micro-light-emitting-diode (micro-LED)-based underwater wireless optical communication (UWOC) system was built, and UWOCs with varied Maalox, chlorophyll, and sea salt concentrations were studied. Data transmission performance of the UWOC and the influence of light attenuation were investigated systematically. Maximum data transmission rates at the distance of 2.3 m were 933, 800, 910, and 790 Mbps for experimental conditions with no impurity, 200.48 mg/m3 Maalox, 12.07 mg/m3 chlorophyll, and 5 kg/m3 sea salt, respectively, much higher than previously reported systems with commercial LEDs. It was found that increasing chlorophyll, Maalox, and sea salt concentrations in water resulted in an increase of light attenuation, which led to the performance degradation of the UWOC. Further analysis suggests two light attenuation mechanisms, e.g., absorption by chlorophyll and scattering by Maalox, are responsible for the decrease of maximum data rates and the increase of bit error rates. Based on the absorption and scattering models, excellent fitting to the experimental attenuation coefficient can be achieved, and light attenuation by absorption and scattering at different wavelengths was also investigated. We believe this work is instructive apply UWOC for practical applications.
-
A GaN Micro-LED Based Underwater Wireless Optical Communication Subjected to Sea Salt, Maalox and Chlorophyll
2018 15th China International Forum on Solid State Lighting: International Forum on Wide Bandgap Semiconductors China (SSLChina: IFWS), 2018Co-Authors: Peiyao Wang, Suyu Yi, Honglan Chen, Er Dan Gu, Xiaolin Zhou, Lirong Zheng, Kai Huang, Pengfei TianAbstract:An underwater wireless optical communication (UWOC) system based on a 40 μm GaN micro-LED was proposed and successfully demonstrated. The system's performances under sea salt, Maalox and Chlorophyll added water were studied. The measurements in bit error rates (BERs) and eye diagrams show that the performances of UWOC systems degrade significantly with increasing concentrations of added substances in water. Maximum transmission data rates up to 933 Mbps, 790 Mbps, 800 Mbps and 910 Mbps were detected in the systems under conditions of tap water, 0.5% sea salt, 1 ml Maalox and 0.25 ml chlorophyll in 414 L tap water, respectively.