Generic expansion of the Jastrow correlation factor in polynomials satisfying symmetry and cusp conditions

2015 ◽  
Vol 142 (8) ◽  
pp. 084111 ◽  
Author(s):  
Arne Lüchow ◽  
Alexander Sturm ◽  
Christoph Schulte ◽  
Kaveh Haghighi Mood
Keyword(s):  
Correlation Factor ◽  
Cusp Conditions

Competitive adsorption of organic solvents using modified and unmodified calcium bentonite clay mineral

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Adsorption Isotherm ◽  
Adsorption Capacity ◽  
Organic Solvents ◽  
Competitive Adsorption ◽  
Correlation Factor ◽  
Isotherm Model ◽  
Isotherm Models ◽  
High Concentration ◽  
Dual Purpose ◽  
Calcium Bentonite

Dodecyltrimethylammonium bromide (DTAB)–modified and unmodified calcium bentonite were both used for the competitive adsorption of aromatics (xylene, ethylbenzene and toluene) and petroleum products (gasoline, dual purpose kerosene and diesel) from their aqueous solution. Infrared spectroscopy (IR) and expansion tests (adsorption capacity and Foster swelling) measurement were performed in order to evaluate the performance of the adsorbents. The Foster swelling index and adsorption capacity of the DTAB modified calcium bentonite in the organic solvents follow the trend: xylene > ethylbenzene > toluene > gasoline > dual purpose kerosene (DPK) > diesel > water. However, the adsorption capacity of the adsorbent in diesel outweighed the adsorption capacity in DPK at high concentration of DTAB indicating that diesel has higher affinity for high DTAB concentration than DPK. The percentage removal of the solvent is directly proportional to the concentration of DTAB used in modifying the bentonite as well as the contact time between the adsorbent and the solvent, hence modified calcium bentonite adsorbed a higher percentage of organic solvents than the unmodified calcium bentonite. The adsorption characteristics of both adsorbents improved remarkably after proper agitation of the organic solvents, the unmodified calcium bentonite however adsorbed more water than the modified bentonite. Data obtained from adsorption isotherm models confirms that Freundlich adsorption isotherm model was favored more than Langmuir adsorption isotherm model with the correlation factor (R2) of the former tending more towards unity. The adsorption of ethylbenzene using DTAB modified and unmodified calcium bentonites follow a pseudo second order kinetics mechanism, suggesting that the rate determining step of adsorption involves both the adsorbent and the organic solvent.

scholarly journals Urban Air Quality Modeling Using Low-Cost Sensor Network and Data Assimilation in the Aburrá Valley, Colombia

Atmosphere ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 91
Author(s):  
Santiago Lopez-Restrepo ◽  
Andres Yarce ◽  
Nicolás Pinel ◽  
O.L. Quintero ◽  
Arjo Segers ◽  
...  
Keyword(s):  
Air Quality ◽  
Data Assimilation ◽  
Transport Model ◽  
Cost Model ◽  
Low Cost ◽  
Model Performance ◽  
Monitoring Network ◽  
Correlation Factor ◽  
Chemical Transport Model ◽  
High Quality

The use of low air quality networks has been increasing in recent years to study urban pollution dynamics. Here we show the evaluation of the operational Aburrá Valley’s low-cost network against the official monitoring network. The results show that the PM2.5 low-cost measurements are very close to those observed by the official network. Additionally, the low-cost allows a higher spatial representation of the concentrations across the valley. We integrate low-cost observations with the chemical transport model Long Term Ozone Simulation-European Operational Smog (LOTOS-EUROS) using data assimilation. Two different configurations of the low-cost network were assimilated: using the whole low-cost network (255 sensors), and a high-quality selection using just the sensors with a correlation factor greater than 0.8 with respect to the official network (115 sensors). The official stations were also assimilated to compare the more dense low-cost network’s impact on the model performance. Both simulations assimilating the low-cost model outperform the model without assimilation and assimilating the official network. The capability to issue warnings for pollution events is also improved by assimilating the low-cost network with respect to the other simulations. Finally, the simulation using the high-quality configuration has lower error values than using the complete low-cost network, showing that it is essential to consider the quality and location and not just the total number of sensors. Our results suggest that with the current advance in low-cost sensors, it is possible to improve model performance with low-cost network data assimilation.

scholarly journals Wafer-Scale Epitaxial Low Density InAs/GaAs Quantum Dot for Single Photon Emitter in Three-Inch Substrate

Nanomaterials ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 930
Author(s):  
Xiaoying Huang ◽  
Rongbin Su ◽  
Jiawei Yang ◽  
Mujie Rao ◽  
Jin Liu ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Single Photon ◽  
Growth Parameters ◽  
Life Time ◽  
Correlation Factor ◽  
Low Density ◽  
Wafer Scale ◽  
Two Photon ◽  
Gaas Quantum Dot ◽  
Highly Uniform

In this work, we successfully achieved wafer-scale low density InAs/GaAs quantum dots (QDs) for single photon emitter on three-inch wafer by precisely controlling the growth parameters. The highly uniform InAs/GaAs QDs show low density of μ0.96/μm2 within the radius of 2 cm. When embedding into a circular Bragg grating cavity on highly efficient broadband reflector (CBR-HBR), the single QDs show excellent optoelectronic properties with the linewidth of 3± 0.08 GHz, the second-order correlation factor g2(τ)=0.0322 ±0.0023, and an exciton life time of 323 ps under two-photon resonant excitation.

Implementation of the CCSD(T)-F12 method using cusp conditions

2008 ◽  
Vol 10 (23) ◽  
pp. 3320 ◽  
Author(s):  
Denis Bokhan ◽  
Seiichiro Ten-no ◽  
Jozef Noga
Keyword(s):  
Cusp Conditions

Evaluation of the alterations in the serum blood sugar level, the activity of AST and ALT enzymes of diabetes mellitus type 2 in Iraqi women patients

2021 ◽  
Vol 16 (8) ◽  
pp. 98-102
Author(s):  
Hashim Abdul Razzaq Iman ◽  
Hussein Murtadha Jinan
Keyword(s):  
Diabetes Mellitus ◽  
Blood Sugar ◽  
Diabetes Mellitus Type 2 ◽  
Correlation Factor ◽  
Diabetes Mellitus Type ◽  
Fasting Blood Sugar ◽  
Diabetic Patients ◽  
Cell Dysfunction ◽  
Iraqi Women

Diabetes mellitus type 2 (T2DM) results from beta cell dysfunction or reduced action of insulin responsive. The objective of this study was to examine the relevance between blood sugar, the activity of aspartate aminotransferase (AST) and alanine aminotransferase (ALT) in fasting women diabetic patients in different durations. A total of sixty-eight women were divided into three groups: first a healthy group – non-diabetic (twenty-six women), second and third groups (twenty-one) were diabetic patients of age 35 – 50 and 51 – 69 years respectively. Serum fasting blood sugar was significantly (P < 0.05) elevated to 181.60 mg/dl in female patients with 35 – 50 years. The same effect happened in activity of AST to 32.91 u/L in 51 – 69 years and ALT was 28.43 u/L in 35 – 50 years. No significant differences were found between the aged and fasting blood sugar, AST and ALT in diabetic patients. The correlation factor (r) between fasting blood sugar and the activity of ALT was highly significant.

scholarly journals Phenolic composition and antioxidant potential of different organs of Kazakh Crataegus almaatensis Pojark: A comparison with the European Crataegus oxyacantha L. flowers

2018 ◽  
Vol 16 (1) ◽  
pp. 415-426 ◽  
Author(s):  
Elmira Bekbolatova ◽  
Wirginia Kukula-Koch ◽  
Tomasz Baj ◽  
Natalia Stasiak ◽  
Galiya Ibadullayeva ◽  
...  
Keyword(s):  
Principal Component ◽  
Natural Antioxidants ◽  
Correlation Factor ◽  
Total Phenolic ◽  
Endemic Plant ◽  
Leaf Extracts ◽  
Polyphenolic Composition ◽  
Antioxidant Potency ◽  
Dpph Scavenging ◽  
Promising Source

AbstractThe aim of this study was to investigate polyphenolic composition of different parts (leaves, flowers and fruits) of Crataegus almaatensis Pojark, an endemic plant of Kazakhstan, and compare it to a well known European Crataegus oxyacantha L. flowers. A Qual-Quant analysis was performed based on HR-MS measurements on 22 secondary metabolites: flavonoids and phenolic acids. Another goal was to evaluate the antioxidant potency of hawthorn extracts which was expressed in the total phenolic content and DPPH scavenging potency tests. Leaf extracts from C. almaatensis were found to be the most rich in metabolites and the most active in antiradical tests (IC50 value of 48 μg/ml and TPC of 218 mg/g). The weakest potential was determined for the fruit extract of this species. According to the performed principal component analysis (PCA), the fruit extracts were not correlated with other organs of the plant, and the metabolites responsible for the extracts’ differentiation were cyanidin 3-glucoside and quetcetin 3-galactoside. Based on a high correlation factor, the flowers of the Kazakh species was found to be as rich in polyphenols as the European hawthorn. The results of this study indicate that C. almaatensis is a promising source of natural antioxidants.

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