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A Study of Detection of Outliers for Working and Non-Working Days Air Quality in Kolkata, India: A Case Study
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作者 mohammad ahmad Weihu Cheng +1 位作者 Zhao Xu Abdul Kalam 《Journal of Environmental Protection》 2023年第8期685-709,共22页
A variety of factors affect air quality, making it a difficult issue. The level of clean air in a certain area is referred to as air quality. It is challenging for conventional approaches to correctly discover aberran... A variety of factors affect air quality, making it a difficult issue. The level of clean air in a certain area is referred to as air quality. It is challenging for conventional approaches to correctly discover aberrant values or outliers due to the significant fluctuation of this sort of data, which is influenced by Climate change and the environment. With accelerating industrial expansion and rising population density in Kolkata City, air pollution is continuously rising. This study involves two phases, in the first phase imputation of missing values and second detection of outliers using Statistical Process Control (SPC), and Functional Data Analysis (FDA), studies to achieve the efficacy of the outlier identification methodology proposed with working days and Nonworking days of the variables NO<sub>2</sub>, SO<sub>2</sub>, and O<sub>3</sub>, which were used for a year in a row in Kolkata, India. The results show how the functional data approach outshines traditional outlier detection methods. The outcomes show that functional data analysis vibrates more than the other two approaches after imputation, and the suggested outlier detector is absolutely appropriate for the precise detection of outliers in highly variable data. 展开更多
关键词 Statistical Process Control Functional Data Analysis Fuzzy C Means OUTLIERS Air Quality
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Outlier Detection of Air Quality for Two Indian Urban Cities Using Functional Data Analysis
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作者 mohammad ahmad Weihu Cheng +1 位作者 Zhao Xu Abdul Kalam 《Open Journal of Air Pollution》 2023年第3期79-91,共13页
Human living would be impossible without air quality. Consistent advancements in practically every aspect of contemporary human life have harmed air quality. Everyday industrial, transportation, and home activities tu... Human living would be impossible without air quality. Consistent advancements in practically every aspect of contemporary human life have harmed air quality. Everyday industrial, transportation, and home activities turn up dangerous contaminants in our surroundings. This study investigated two years’ worth of air quality and outlier detection data from two Indian cities. Studies on air pollution have used numerous types of methodologies, with various gases being seen as a vector whose components include gas concentration values for each observation per-formed. We use curves to represent the monthly average of daily gas emissions in our technique. The approach, which is based on functional depth, was used to find outliers in the city of Delhi and Kolkata’s gas emissions, and the outcomes were compared to those from the traditional method. In the evaluation and comparison of these models’ performances, the functional approach model studied well. 展开更多
关键词 Functional Data Analysis OUTLIERS Air Quality Gas Emission Classical Statistics
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Protective Effect of Curcumin on Anxiety, Learning Behavior, Neuromuscular Activities, Brain Neurotransmitters and Oxidative Stress Enzymes in Cadmium Intoxicated Mice 被引量:1
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作者 Gasem M. Abu-Taweel Jamaan S. Ajarem mohammad ahmad 《Journal of Behavioral and Brain Science》 2013年第1期74-84,共11页
Cadmium (Cd) exposure can induce acute lethal health-related threats to humans since it has an exceptional ability to accumulate in living organisms and cause toxicological effects. Curcumin (Cur) on the other hand ha... Cadmium (Cd) exposure can induce acute lethal health-related threats to humans since it has an exceptional ability to accumulate in living organisms and cause toxicological effects. Curcumin (Cur) on the other hand has a wide variety of biological activities and several animal studies have suggested for a potential therapeutic or preventive effects against several ailments and infections. To study the effect of Cur on the toxicity of Cd, sixty Swiss-Webster strain male mice were divided into 6 groups of ten each at random. Group-1 served as the na?ve control and received no treatment. Group-2, 3 and 4 were the experimental controls and were administered once a day with a single oral dose of 50% dimethyl sulphoxide (DMSO), Cur (300 mg/kg) or Cd (100 mg/kg) respectively, for 2 weeks. Group-5 and 6 received Cur and Cd in combination once a day orally for 2 weeks except that Cur in a dose of 150 and 300 mg/kg to group 5 and 6 respectively, was administered one hour before Cd (100 mg/kg) administration to both groups. After treatment period, the animals were subjected to behavioral tests and thereafter, the animals were sacrificed for the estimation of neurotransmitters like serotonin (5-HT), dopamine (DA) and it’s metabolite 3,4-dihydroxyphenylacetic acid (DOPAC) as well as oxidative stress enzymes like lipid peroxides in the form of thiobarbituric acid–reactive substances (TBARS) and total glutathione (GSH) in the forebrain tissue. Cd reduced significantly the body weight gain, the locomotor activity, anxiety behavior in the plus maze and the learning capability (cognitive effect) in the shuttle-box test. Biochemical analysis further revealed that Cd exposure significantly altered the brain neurotransmitters and the oxidative stress enzymes. However, administration of Cur along with Cd had an ameliorating effect on all the behavioral and biochemical parameters studied herein and reduced the toxicity of Cd significantly and dose-dependently. Thus, Cur may be beneficial for anxiety, neuromuscular, and cognitive problems and protect from Cd intoxication. 展开更多
关键词 CURCUMIN CADMIUM Male MICE ANXIETY Cognitive Behaviors NEUROTRANSMITTERS Oxidative Stress
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Design and Evaluation of Solar Inverter for Different Power Factor Loads
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作者 mohammad ahmad B. H. Khan 《Energy and Power Engineering》 2012年第5期324-329,共6页
This paper analyzes and compares the performance of a new inverter topology with two types of input sources: 1) Solar PV source and 2) Ideal dc source (battery). The simulation is done in SIMULINK/MATLAB Software. It ... This paper analyzes and compares the performance of a new inverter topology with two types of input sources: 1) Solar PV source and 2) Ideal dc source (battery). The simulation is done in SIMULINK/MATLAB Software. It is shown that when the solar panel is connected, spikes are obtained in output voltage waveforms. These spikes are eliminated by inserting a capacitor. The capacitor is chosen for a particular power factor which is optimum with respect to cost, size and power quality. Total Harmonic Distortion, Active Power, Reactive Power, RMS Voltage and RMS Current are measured for different load power factor. Finally these results are compared with those obtained using battery with same input voltage magnitude. This Paper shows that for Solar Panel Circuit, THD, P and Q are less for 0.8 and above power factor, however below 0.8 PF, the THD, active and reactive power transfer are more. This means that the performance of Solar Panel in the proposed circuit topology is seen to be better as compared to the same circuit with battery within a range of power factor. 展开更多
关键词 H-BRIDGE INVERTER Level Module (LM) POWER Quality POWER Factor Total Harmonic DISTORTION (THD)
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Cinnamon Attenuates Cognitive Dysfunction,Hippocampal Oxidative Stress and Neurodegeneration Following Status Epilepticus in Young Male Rats
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作者 mohammad ahmad mohammad A.M.Wadaan 《Journal of Pharmacy and Pharmacology》 CAS 2021年第10期342-350,共9页
The present study explores the neuroprotective effects of the natural food product Cinnamomum cassia or Cinnamon(CIN)on lithium pilocarpine(Li-Pc)induced SE in experimental rats to look into a possibility of it being ... The present study explores the neuroprotective effects of the natural food product Cinnamomum cassia or Cinnamon(CIN)on lithium pilocarpine(Li-Pc)induced SE in experimental rats to look into a possibility of it being used as antiepileptic drug.Recent studies have shown significant potential of pharmacological,prophylactic or therapeutic use of CIN in many beneficial activities in the body.The animals received CIN pre-treatment before induction of SE.Besides the severity of the seizures,other parameters like cognitive behavioral dysfunction,hippocampal oxidative stress and histological abnormalities in the hippocampus of animals induced with SE by lithium(Li)in 3 mEq/ml/kg dose,i.p.followed 20 h later by pilocarpine(Pc)in 20 mg/ml/kg dose,s.c.CIN was administered intraperitoneally at the doses of 25 and 50 mg/mL/kg,30 minutes before Pc injection.Mortality(if any)within 24 hours was also recorded.Ethical approval was obtained from the Ethics Committee Review Board of the College of Pharmacy of King Saud University,Riyadh,Saudi Arabia.Treatment with CIN significantly ameliorated the frequency and severity of epileptic seizures in a dose-dependent manner.The cognitive dysfunctions were improved,hippocampal oxidative stress was ameliorated and neuronal cell loss in the hippocampus were also attenuated significantly and dose-dependently by CIN.Possible therapeutic application of CIN as an antiepileptic and as an antioxidant for the treatment of SE has a great potential and warrants further studies. 展开更多
关键词 CINNAMON status epilepticus cognitive dysfunction oxidative stress HIPPOCAMPUS neuronal cell loss.
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