oalib

OALib Journal期刊

ISSN: 2333-9721

费用：99美元

投稿

时间不限

( 2673 )

( 2672 )

( 2454 )

( 2208 )

自定义范围…

匹配条件： “E. A. Celarier” ，找到相关结果约676154条。
列表显示的所有文章，均可免费获取
第1页/共676154条
每页显示 条
A new stratospheric and tropospheric NO2 retrieval algorithm for nadir-viewing satellite instruments: applications to OMI
E. J. Bucsela,N. A. Krotkov,E. A. Celarier,L. N. Lamsal
Atmospheric Measurement Techniques Discussions , 2013, DOI: 10.5194/amtd-6-1361-2013
Abstract: We describe a new algorithm for the retrieval of nitrogen dioxide (NO2) vertical columns from nadir-viewing satellite instruments. This algorithm (SP2) is the basis for the Version 2.1 OMI NO2 Standard Product and features a novel method for separating the stratospheric and tropospheric columns. The approach estimates the stratospheric NO2 directly from satellite data without using stratospheric chemical transport models or assuming any global zonal wave pattern. Tropospheric NO2 columns are retrieved using air mass factors derived from high-resolution radiative transfer calculations and a monthly climatology of NO2 profile shapes. We also present details of how uncertainties in the retrieved columns are estimated. The sensitivity of the retrieval to assumptions made in the stratosphere-troposphere separation is discussed and shown to be small, in an absolute sense, for most regions. We compare daily and monthly mean global OMI NO2 retrievals using the SP2 algorithm with those of the original Version 1 Standard Product (SP1) and the Dutch DOMINO product. The SP2 retrievals yield significantly smaller summertime tropospheric columns than SP1 and are relatively free of modeling artifacts and negative tropospheric NO2 values. In a re-analysis of an INTEX-B validation study, we show that SP2 largely eliminates a ～20% discrepancy that existed between OMI and independent in situ springtime NO2 SP1 measurements.
Three Weeks Carboplatin/Paclitaxel versus Weekly Regimen in Egyptian Women Cohort Treated for Ovarian Carcinoma  [PDF]
A. Mounir, E. E. Ibrahim
Journal of Cancer Therapy (JCT) , 2021, DOI: 10.4236/jct.2021.122009
Abstract: Introduction: Epithelial Ovarian Carcinoma (EOC) comprises the vast majority (almost 90%) of ovarian carcinomas. Chemotherapy is the main treatment in ovarian cancers. The standard of care in the chemotherapeutic is the combination of a platinum (carboplatin or cisplatin) and a taxane (paclitaxel or docetaxel). Studies were done to determine whether this combination to be given weekly or every 3 weeks. Patient and Method: Inclusion criteria: 1) Female patients between the ages of 17 - 78 years. 2) Baseline hematological, renal and liver laboratory profiles were within accepted ranges. 3) Performance status of the patients was 0-II. 4) Patients were pathologically proven ovarian cancer. 5) A follow-up period for at least 6 months was required. Exclusion criteria: 1) Patients who had double malignancy were excluded. 2) Performance status more than II. 3) Other comorbidity. Results: We reviewed 69 female patients with EOC, with 60% received every three weeks regimen. Mean age was 53.22 years. At a median follow up of 45.9 months, there was no significant different between the two protocols in terms of mean PFS, 62.35 months (95% CI: 50.08 - 74.63 months) for the three-weekly cohort, and 69.25 months (95% CI: 55.24 - 83.26 months) for weekly protocol (p = 0.613). The three weekly regimen patients had a higher incidence of hospital admission (40% vs 18.5% for the weekly protocol patients), but it didn’t reach a statistical significance (p = 0.063). The three weekly protocol had a significantly higher incidence of causing a neutropenic fever (p = 0.003). Conclusion: In our cohort of Egyptian women with EOC, no significant difference in PFS was found when compared the weekly Carboplatin/paclitaxel when compared to the classic three weeks, although the weekly protocol may be causing less febrile neutropenia and fewer hospital admissions.
On chromospheric variations modeling for main-sequence stars of G and K spectral classes  [PDF]
E. A Bruevich
Natural Science (NS) , 2011, DOI: 10.4236/ns.2011.38087
Abstract: We present a method of 13 late-type main-sequence stars chromospheric flux observation data calculations. These Sun-like stars have well-determined cyclic flux variations similar to the 11-year solar activity cycle. Our flux prediction is based on chromospheric HK emission time series measurements from the Mount Wilson Observatory and comparable solar data. We show that solar three - component modeling explains well the stellar observations. We find that the 10 - 20% of K - stars disc’s surfaces are occupied by bright active regions.
Chronic effect of olive oil on some neurotransmitter contents in different brain regions and physiological, histological structure of liver and kidney of male albino rats  [PDF]
A. E. Bawazir
World Journal of Neuroscience (WJNS) , 2011, DOI: 10.4236/wjns.2011.13005
Abstract: Olive oil is an important source of mono-unsaturated fat and a prime component of the Mediterranean diet. The beneficial health effects of olive oil are due to both its high content of mono-unsaturated fatty acids and its high content of anti-oxidative substances. The objective of this study was to investigate the basis for the epidemiological information relating to the health benefits associated with the consumption of ex-tra-virgin olive oil (EVOO). The effect of olive oil on norepinephrine (NE), dopamine (DA), serotonin (5-HT) and gamm-aminobutyric acid (GABA) con-tents in different brain regions and histological structure of liver and kindey of male albino rats was studied. The chronic administration of olive oil (7.5 mg/kg body wt.) caused a significant increase in norepinephrine (NE), dopamine (DA) , serotonin (5-HT) and gamm-aminobutyric acid (GABA) con-tent in different brain regions (Cerebellum, striatum, cerebral cortex, hypothalamus, brain steam and hip-pocampus) of male albino rats. The increase in NE, DA, 5-HT, and GABA content in the different CNS areas of male albino rat may be due to the inhibition of Ca2+/calmodulin binding which plays an important role in the release of these neurotransmitters. The results, also, revealed that urea and creatinne con-centrations in rats with oral administration with olive oil were decreased. Meanwhile, the activities of the enzymes AsT, AlT and ALP were elevated. The pre-sent results indicated that there is no change in tis-sues of kidney after treated with virgin olive oil. Olive oil may potentially be safe for use as a sedative drug. improvement also led to the reductions in risk of Alzheimer’s and Parkinson’s diseases.
Impact on Water Resources in a Mountainous Basin under the Climate Change Transient Scenario (UKTR)  [PDF]
E. A. Baltas
American Journal of Climate Change (AJCC) , 2014, DOI: 10.4236/ajcc.2014.31010
Abstract:

The impact of climate change on the hydrological regime and water resources in the basin of Venetikos river, in Greece is assessed. A monthly conceptual water balance model was calibrated in this basin using historical hydro meteorological data. This calibrated model was used to estimate runoff under a transient scenario (UKTR) referring to year 2080. The results show that the mean annual runoff, mean winter and summer runoff values, annual maximum and minimum values, as well as, monthly maximum and minimum, will be reduced. Additionally, an increase of potential and actual evapotranspiration was noticed due to temperature increase.

Neural Network Based Normalized Fusion Approaches for Optimized Multimodal Biometric Authentication Algorithm  [PDF]
E. Sujatha, A. Chilambuchelvan
Circuits and Systems (CS) , 2016, DOI: 10.4236/cs.2016.78103
Abstract: A multimodal biometric system is applied to recognize individuals for authentication using neural networks. In this paper multimodal biometric algorithm is designed by integrating iris, finger vein, palm print and face biometric traits. Normalized score level fusion approach is applied and optimized, encoded for matching decision. It is a multilevel wavelet, phase based fusion algorithm. This robust multimodal biometric algorithm increases the security level, accuracy, reduces memory size and equal error rate and eliminates unimodal biometric algorithm vulnerabilities.
Iterative Solution of Mesh Constrained Optimal Control Problems with Two-Level Mesh Approximations of Parabolic State Equation  [PDF]
A. Lapin, E. Laitinen
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61007
Abstract:
We consider a linear-quadratical optimal control problem of a system governed by parabolic equation with distributed in right-hand side control and control and state constraints. We construct a mesh approximation of this problem using different two-level approximations of the state equation, ADI and fractional steps approximations in time among others. Iterative solution methods are investigated for all constructed approximations of the optimal control problem. Their implementation can be carried out in parallel manner.
How the Brain Process Stimulus-Response Conflict? New Insights from Lateralized Readiness Potentials Scalp Topography and Reaction Times  [PDF]
Marc E. Lavoie, Johannes E. A. Stauder
Journal of Behavioral and Brain Science (JBBS) , 2013, DOI: 10.4236/jbbs.2013.31014
Abstract:
Stimulus-Response Compatibility (SRC) refers to the fact that some tasks are performed easier and better than others because of the way stimuli and responses are paired with each other. To assess the brain responses to stimulus-response conflicts, we investigated the behavioral (accuracy and Reaction Times: RTs) as well as the physiological response (Lateralized Readiness Potentials: LRP) modulations in a positional blocked and a conditional mixed design in twelve university students. Results revealed that the performance was less accurate and the RTs, as well as the LRP onset, were delayed under the mixed conditional design. A greater compatibility effect was also noted on accuracy, RTs and LRP onset latency in the mixed design. Consistent with these findings, smaller peak activation at fronto-central areas suggests that more selective inhibition is needed in a mixed design context. Despite a smaller activation, the topographical distribution is similar in both designs. These results indicate that the translation time between stimulus- and response codes are greater under the mixed instruction, while the similar LRP topography suggests that common neural structures underlie LRPs in response to both type of designs.
Numerical Investigation of the Tri-Atomic Ions Formation during Laser Ionization Based on Resonance Saturation  [PDF]
M. A. Abdelati, M. A. Mahmoud, Y. E. E. Gamal
Journal of Applied Mathematics and Physics (JAMP) , 2014, DOI: 10.4236/jamp.2014.212131
Abstract:

We present a theoretical investigation of plasma generation in sodium vapor induced by laser radiation tuned to the first resonance line (3S-3P) at λ = 589 ns. A set of rate equations that describe the rate of change of the ground and excited states population as well as the temporal variation of the electron energy distribution function (EEDF), beside the formed atomic ion Na+, molecular ion  and tri-atomic ions are solved numerically. The calculations are carried out at different laser energy and different sodium atomic vapor densities under the experimental conditions of Tapalian and Smith (1993) to test the existence of the formed tri-atomic ions. The numerical calculations of the electron energy distribution function (EEDF) show that a deviation from the Maxwellian distribution due to the super elastic collisions effect. In

The influence of altitude and management on carbon stock quantities in rungwe forest, southern highland of Tanzania  [PDF]
B. Mwakisunga, A. E. Majule
Open Journal of Ecology (OJE) , 2012, DOI: 10.4236/oje.2012.24025
Abstract: A study was conducted to assess the impacts of elevation, tree species and management on carbon stock on the slopes of Rungwe Mountain in Tanzania. Twenty 15 m radius plots with trees of DBH >10 cm were used to collect trees measurements as well as soil samples at depths of 10 cm, 20 cm and 30 cm. Tree data collected were calculated and analyzed for tree biomass and carbon by using the Tree Biomass Equations (TBE) while soil samples were analyzed for total soil carbon using oxidative reduction method in which soils were combusted at about 600°C in a muffle furnace to released CO2 and SO2 gases carried by the oxygen flow into cells. The results showed that aboveground carbon content increased with altitude ranging from 9.2 t/ha at 2031 m to 561.7 t/ha at 2312 m.a.s.l due to little forest disturbance at high altitudes. However, the trend changed drastically at 2312 m.a.s.l. Soil carbon content tended to increase down the slope ranging from 3.8 t/ha at 2.312 to 4.7 t/ha at 2031 m.a.s.l, respectively. In general, there is limited awareness on sustainable management of forest resource in the study area. It is necessary to empower local communities to monitor and manage their forest resources so that they can contribute to climate change mitigation and income generation through carbon trade under REDD initiative.
第1页/共676154条
每页显示 条


Home
Copyright © 2008-2020 Open Access Library. All rights reserved.