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  • 1
    Online Resource
    Online Resource
    Set Publishers ; 2021
    In:  Journal of Basic & Applied Sciences Vol. 9 ( 2021-10-21), p. 587-591
    In: Journal of Basic & Applied Sciences, Set Publishers, Vol. 9 ( 2021-10-21), p. 587-591
    Abstract: The stratosphere is one of the constituents of thermal structure of the atmosphere. The maximum concentration of ozone is found at the stratospheric region where it is interacted by many species including chemical and physical processes. Atmosphere as a whole is an open system that is regarded as a non linear system and that seems to be complex. Therefore, a non-linear trend is plausible to explain phenomenon of ozone layer depletion (OLD). In this manuscript we have paid our attention in the analysis of the major portion of historic data on stratospheric O3based on ground-based measurements by the Dobson Spectrophotometer. In this communication we have estimated parameters for describing non-linearity in the process using polynomial trend functions and predicted values are calculated for the period from 1960 to 1999. Future values for ozone depths are computed till 2006 and compared with the minor portion of the data set.
    Type of Medium: Online Resource
    ISSN: 1927-5129 , 1814-8085
    Language: Unknown
    Publisher: Set Publishers
    Publication Date: 2021
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  • 2
    Online Resource
    Online Resource
    Set Publishers ; 2013
    In:  Journal of Basic & Applied Sciences Vol. 9 ( 2013-01-05), p. 483-488
    In: Journal of Basic & Applied Sciences, Set Publishers, Vol. 9 ( 2013-01-05), p. 483-488
    Abstract: In this communication we have assessed explorative nature of ozone layer dynamics using data of ozone depth from 1984-to 2010 at the stratospheric region of China and Pakistan. This study comprises the parametric evaluation that characterizes the physical behaviour of stratospheres of both the regions. For this purpose we have adopted exploratory data analysis (EDA). The results indicated an obvious distinction in the fluctuating dynamics of China and Pakistan. The models discussed in this communication can be used for public, private and government organizations and compared with other countries stratospheric ozone layer dynamics.
    Type of Medium: Online Resource
    ISSN: 1927-5129 , 1814-8085
    Language: Unknown
    Publisher: Set Publishers
    Publication Date: 2013
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  • 3
    Online Resource
    Online Resource
    Set Publishers ; 2015
    In:  Journal of Basic & Applied Sciences Vol. 11 ( 2015-01-05), p. 240-243
    In: Journal of Basic & Applied Sciences, Set Publishers, Vol. 11 ( 2015-01-05), p. 240-243
    Abstract: Energy incident from the Sun is the chief deriving force responsible for all physical process existing in our terrestrial system. It is interesting to note that solar ultraviolet (UV) radiation created ozone in our stratosphere by the dissociation of O2 molecules. On the other hand, the streams of solar particle flux deplete ozone by creating NOx in our atmosphere. It is therefore, an important task to quantify the contribution of solar activity on OLD with the scientific assurance. In this communication the stochastic models of solar flare duration as solar activity have been investigated. Digisonde, at SUPARCO, HQ one of the ground based device provide us the record of solar flare duration by investigating the ionosphere disturbance. The behavior of solar activity have accomplished by the stochastic modeling in addition to their residual analysis. Since there are two major kinds of flares, it is necessary to establish what the different parametric configurations that causes their difference and their behavior in solar terrestrial relationship. Evidences suggest that gradual flares may become serious threat for our atmospheric and terrestrial disturbances. Their frequency most closely related with high activity periods. However sometimes this could be accomplished in low activity period as well. Hence, it is quite relevant to study theoretical and observational aspects of both high and low activity periods. The data recorded from March 1979 to March 2006 was consisting of mixed flares.
    Type of Medium: Online Resource
    ISSN: 1927-5129 , 1814-8085
    Language: Unknown
    Publisher: Set Publishers
    Publication Date: 2015
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  • 4
    Online Resource
    Online Resource
    Set Publishers ; 2021
    In:  Journal of Basic & Applied Sciences Vol. 8, No. 2 ( 2021-07-02), p. 370-373
    In: Journal of Basic & Applied Sciences, Set Publishers, Vol. 8, No. 2 ( 2021-07-02), p. 370-373
    Abstract: In the present study monthly and annually data of ozone depth and cosmic rays (CRs) intensity at China Beijing during the period of 1984-2010 have been analyzed to investigate the effects of cosmic rays intensity on ozone layer depletion (OLD). This communication implements statistical analysis on the data sets for the specified period mentioned above. The analyses exhibit that mean monthly variation of cosmic rays intensity increases. Our investigation claims that in the month of May (1984-2010) changes occurred in the decrease the ozone depth due to the increase in cosmic rays intensity .This sort of study confirms cosmic rays influence on the ozone layer depletion.
    Type of Medium: Online Resource
    ISSN: 1927-5129 , 1814-8085
    Language: Unknown
    Publisher: Set Publishers
    Publication Date: 2021
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  • 5
    In: Journal of Basic & Applied Sciences, Set Publishers, Vol. 13 ( 2017-01-05), p. 311-315
    Abstract: It is well known that, air pollution is a composite phenomenon and intense air pollution events are governed by huge number of consistent factors. In this study, we considered the pollutant parameter (NO2, NO, NOx and CO) concentrations and were measured simultaneously during the period 21/11/2009 to 27/02/2010 in city of Karachi. The estimations were carried out to study the variability of pollutant emissions. Time Series analysis confirms the existence of variation in pollutant with mean daily concentration and the results suggest that the concentrations of pollutant over the interval are slowly declined. The relationships NO2 with NOx, NO with NOx and NO2 vs. CO were modeled with linear regression. The results of the linear regression detected underlying strong relationships among pollutant variables. The application of the regression approach confirmed that the NO2 strongly correlated with other paired pollutants. The study will be helpful to the policy makers to control air pollution and the sustainable environment. It also needs to extend this research to study the nonlinear behavior of atmospheric pollutants in perspective of fractal dimension.
    Type of Medium: Online Resource
    ISSN: 1927-5129 , 1814-8085
    Language: Unknown
    Publisher: Set Publishers
    Publication Date: 2017
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  • 6
    Online Resource
    Online Resource
    Lifescience Global ; 2015
    In:  International Journal of Statistics in Medical Research Vol. 4, No. 1 ( 2015-12-27), p. 1-7
    In: International Journal of Statistics in Medical Research, Lifescience Global, Vol. 4, No. 1 ( 2015-12-27), p. 1-7
    Abstract: The authors investigate the effects of clinical covariates upon the outcome of Intra-cerebral Hemorrhage (ICH) patients by applying a discriminate model of logistic regression. About 985 patients’s data with ICH have been collected using the International classification of diseases; ninth revision codes are also included. Diagnostic codes (434 for stroke and 431 for ICH) were used to identify patients and confirmed by neuro-imaging of the patients using CT scan and MRI. A univariate analysis of 88 covariates was undertaken and 46 of them reached statistical significance at an acceptable level of p 〈 0.05. The multivariable analysis exhibited a significant negative relationship between ICH and hypertension. The improvement among ICH patients having hypertension was found to be 0.5 with the p=0.001, ARR=0.5, 95% C.I. 0.3 – 0.8. The development among ICH patients using antihypertensive medicine was 1.3 with p = 0.021, ARR=1.3, 95% C.I. 1.0 – 1.6. Thus present study manifested that ICH has strong relationship with use of antihypertensive medicine. The rate of perfection in the patients physiological conditions using antihypertensive medicine at the time of discharge was 2.9 times acquiring p 〈 0.001, ARR=2.9, 95% C.I. 2.7 – 3.2 as compared to those who could not use antihypertensive medicine. The change in ARR from 1.3 to 2.9 times depict that the exercise of antihypertensive medicine and ICH outcome are positively associated. The fluctuations in ARR of hypertensive range of systolic blood pressure (SBP) also indicate that the blood pressure range and ICH outcome are negatively correlated. The neurological symptomoatology, indistinct speech and double vision are important factors of proposed models. Moreover, a clear decrease was found in mental status from normal to coma in most suitable model. Surgery is an important part of recovery, and estimated that the improvement among the ICH patients, who were treated under surgical aspects, was 1.4 times with significant p-value in the best models. The complication of pneumonia during treatment of ICH subjects has highly significant showing negative correlation with the given outcome variable. The current model has 89.3% area under the curve with sensitivity (82.6%), specificity (81.3%) and p-value (0.308). This indicates that the constructed model bestows the well performance of the ICH outcome and the model is considered as excellent.
    Type of Medium: Online Resource
    ISSN: 1929-6029
    Language: Unknown
    Publisher: Lifescience Global
    Publication Date: 2015
    detail.hit.zdb_id: 2810580-1
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  • 7
    Online Resource
    Online Resource
    Elsevier BV ; 2014
    In:  Journal of Atmospheric and Solar-Terrestrial Physics Vol. 109 ( 2014-03), p. 43-47
    In: Journal of Atmospheric and Solar-Terrestrial Physics, Elsevier BV, Vol. 109 ( 2014-03), p. 43-47
    Type of Medium: Online Resource
    ISSN: 1364-6826
    RVK:
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2014
    detail.hit.zdb_id: 2020910-1
    SSG: 16,13
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  • 8
    Online Resource
    Online Resource
    IOP Publishing ; 2013
    In:  Journal of Physics: Conference Series Vol. 439 ( 2013-06-10), p. 012052-
    In: Journal of Physics: Conference Series, IOP Publishing, Vol. 439 ( 2013-06-10), p. 012052-
    Type of Medium: Online Resource
    ISSN: 1742-6596
    Language: Unknown
    Publisher: IOP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 2166409-2
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