Effects of electron injection on the magnetic and magnetocaloric behavior of Sr₂FeMoO₆ double perovskite

Hussain, I.,Anwar, M.S.,Khan, S.N.,Kim, J.W.,Chung, K.C.,Koo, B.H. ELSEVIER SCIENCE 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.694 No.-

With the aim of determining and distinguishing the influence of rare-earth doping on the strength of magnetic interactions, magnetic and magnetocaloric properties of Sr<SUB>2-x</SUB>Pr<SUB>x</SUB>FeMoO<SUB>6</SUB> (x = 0.0, 0.1, 0.2, 0.3) double perovskite were investigated. The X-ray diffraction analysis revealed that all the samples crystallized in a tetragonal structure with I4/mmm space group. The temperature dependent magnetization and Arrott analysis suggested a second order of ferromagnetic phase transition in all the synthesized samples. The competing interaction between the electron injection and steric effect resulted in a non-monotonic evolution of the Curie temperature (T<SUB>C</SUB>). In the low Pr doped samples the raising of the Curie temperature is mainly due to the electronic effects while the decrease in T<SUB>C</SUB> observed for higher Pr doping (x = 0.3) is attributed to the steric effects. The magnetization was observed to increase with the increasing Pr doping (up to x = 0.2) indicating a progressive increase in cationic ordering. The magnetic entropy change was evaluated from the measurement of isothermal magnetization with respect to the magnetic field at different temperatures. The maximum magnetic entropy change and the relative cooling power were found to increase with the increasing Pr doping (x @? 0.2). The tunability of magnetization as well as Curie temperature simply by adjusting the dopant concentration and synthesis conditions makes Sr<SUB>2</SUB>FeMoO<SUB>6</SUB> a potential candidate for exploring the new kind of magnetic refrigerants.

Influence of La addition on the structural, magnetic and magnetocaloric properties in Sr_2-xLa_xFeMoO₆ (0@?x@?0.3) double perovskite

Hussain, I.,Anwar, M.S.,Kim, J.W.,Chung, K.C.,Koo, B.H. Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.11

We report the effect of carrier doping via partial substitution of La<SUP>3+</SUP> for Sr<SUP>2+</SUP> on the structural, magnetic and magnetocaloric properties of Sr<SUB>2</SUB>FeMoO<SUB>6</SUB> double perovskite. Polycrystalline Sr<SUB>2-x</SUB>La<SUB>x</SUB>FeMoO<SUB>6</SUB> (x=0.0, 0.1, 0.2, 0.3) samples were prepared using the conventional solid state reaction method. Using the X-ray diffraction (XRD) analysis it was established that all the samples crystallized in a tetragonal structure with I4/mmm space group. An increase in the La doping lead to an increase in the lattice parameter 'a' and the volume of the unit cell. The lattice parameter 'c' however remained unchanged. The temperature variation in magnetization and Arrott analysis suggested a second order of ferromagnetic phase transition in all samples with Curie temperature, T<SUB>C</SUB> increasing from 358K for x=0.0-365K for x=0.3. A gradual increase in magnetization was also observed with the increasing La content up to x=0.2. The magnetic entropy change was calculated from the measurement of isothermal magnetization versus magnetic field at different temperatures. The tunability of magnetization and T<SUB>C</SUB> simply by adjusting the concentration of La and synthesis conditions makes Sr<SUB>2</SUB>FeMoO<SUB>6</SUB> an attractive material for magnetic refrigeration at desired temperature.

Effect of Zn on the Magnetic and Magnetocaloric Properties of (0.95)La0.7Ca0.3MnO3/(0.05)Mn1−x Zn x Fe2O4 Composites

Hussain, I.,Anwar, M. S.,Lee, S. R.,Koo, B. H. Springer Science + Business Media 2015 Journal of superconductivity and novel magnetism Vol.28 No.11

<P>We report the structural, magnetic, and magnetocaloric properties of (0.95)La0.7Ca0.3MnO3/(0.05)Mn1-x Zn (x) Fe2O4 (x = 0.0, 0.1, 0.3, 0.5) composites. Polycrystalline samples of the composite material were prepared using the solid-state reaction method. The phase purity and structure of the samples were confirmed using the X-ray powder diffraction (XRD) method. Scanning electron microscope (SEM) studies of the samples reveal that Mn1-x Zn (x) Fe2O4 is mainly distributed at the surface and grain boundaries of the perovskite matrix La0.7Ca0.3MnO3. The variation of magnetization (M) as a function of temperature and applied magnetic field was investigated. The M-T data plots indicate a paramagnetic to ferromagnetic transition upon cooling in all samples. The magnetic entropy change was also studied through the examination of measured magnetic isotherms, M (H, T) near Curie temperature T (C) . A magnetocaloric effect has been estimated in terms of isothermal magnetic entropy change. A maximum entropy change value of 1.72 J/kg K was recorded for a magnetic field change of 3 T with a relative cooling power (RCP) value of 177 J/kg for the (0.95)La0.7Ca0.3MnO3/(0.05)MnFe2O4 composite sample.</P>

Evaluation of the Influence of Asphalt Emulsion on the Strength, Durability, and Damping Performance of Filling Layer Self-Compacting Concrete

Hussaini Abdullahi Umar,Xiaohui Zeng,Xuli Lan,Huasheng Zhu,Yirui Li,Haichuan Liu 대한토목학회 2022 KSCE JOURNAL OF CIVIL ENGINEERING Vol.26 No.12

Filling layer self-compacting concrete (FLSCC) is an essential material used in the construction of China Rail Track System type III (CRTS III) slab track of high-speed rail. The mechanical properties of the filling layer are of paramount significance to the performance and serviceability of the track system. In this study, asphalt emulsion (AE) was incorporated into the FLSCC, and various properties related to workability, strength, durability, and damping performance were experimentally evaluated. The effect of AE on the durability of FLSCC was investigated through water absorption, sorptivity, and rapid chloride ion penetration tests; while damping properties were evaluated using impact resonance method. Results show that addition of AE decreases the compressive and split tensile strength while flexural strength increases, especially at lower AE content. The durability properties were greatly enhanced with the addition of AE, which results from the decreased permeability of FLSCC specimens due to the pore-filling effect of asphalt film that flows and fills the pores and cracks of the matrix. Damping ratio of FLSCC increased by 22.8%, 23.7%, 25%, and 30.6% through the addition of 5%, 10%, 15%, and 20% AE, respectively. According to the findings of this study, AE content up to 10% is recommended for FLSCC production.

Spatial justice in relation to the urban amenities distribution in Austin, Texas

Fatema Hussaini,Ebrahim Farhadi,Ahmad Pourahmad,Simona Tondelli 대한공간정보학회 2023 Spatial Information Research Vol.31 No.1

In addition to enhancing our theoretical grasp of justice, thinking spatially about it can also reveal important new insights that broaden our practical understanding in order to advance justice and democracy. On the other hand, these opportunities won’t be as obvious if the spatial equities aren’t made apparent and strong. Austin city has experienced a fast-urban growing in the past decades. As urban areas grow, the public facilities should increase. The purpose of this paper investigates Facilities in terms of public facilities. Even though we said that the concept of justice is very complex, it is possible to get an understanding of it by using a quantitative method. This paper explores the condition of urban justice and opportunities for accessibility to public facilities for all residents in Austin by using GIS data and the Fuzzy logic model. The facilities and services maps were made in GIS and after the Euclidean Distance and Reclassify function in Arc Map, the Fuzzy Logic model was used to analyze spatial justice. The result shows the facilities are distributed properly. Spatial justice is in the context of Austin and residents enjoy spatial justice.

Sub-acute toxicity study on hydromethanolic leaves extract of Combretum hypopilinum (Combretaceae) Diels in Wistar rats

Ahmad Mubarak Hussaini,Zezi Abdulkadir Umar,Anafi Sherifat Bola,Alshargi Omar Yahya,Mohammed Mustapha,Mustapha Sagir,Bala Auwal Adam,Muhammad Surajuddeen,Julde Sa’adatu Muhammad,Wada Abubakar Sadiq,Ja 한국독성학회 2022 Toxicological Research Vol.38 No.4

The plant Combretum hypopilinum Diels (Combretaceae) has been utilized in Nigeria and other African nations to treat many diseases including liver, inflammatory, gastrointestinal, respiratory, infectious diseases, epilepsy and many more. Pharmacological investigations have shown that the plant possesses anti-infective, antidiarrhoeal, hepatoprotective, antiinflammatory, anticancer, sedative, antioxidant, and antiepileptic potentials. However, information on its toxicity profile is unavailable despite the plant's therapeutic potential. As such, this work aimed to determine the acute and sub-acute oral toxic effects of the hydromethanolic leaves extract of C. hypopilinum. The preliminary phytochemical evaluation was carried out based on standard procedures. The acute toxicity evaluation was conducted by oral administration of the extract at the dose of 5000 mg/kg based on the guideline of the Organization of Economic Co-operation and Development (OECD) 423. To investigate the sub-acute toxicity effects, the extract was administered orally to the animals daily for 28-consecutive days at the doses of 250, 500, and 1000 mg/kg. Mortality, body weight and relative organ weight were observed. The hepatic, renal, haematological, and lipid profile parameters were investigated. The liver, kidney, heart, lung, small intestine, and stomach were checked for any histopathological alterations. The results of the phytochemical investigation showed cardiac glycosides, tannins, steroids, flavonoids, alkaloids, saponins, and triterpenes. Based on the acute toxicity investigation outcome, no death and signs of toxic effects were observed. The result showed that the oral median lethal dose ( LD50) of the extract was more than the 5000 mg/kg. The extract remarkably reduced the weekly body weight of the animals at 500 mg/kg in the first and second weeks. It also significantly decreased the relative kidney weight, alkaline phosphatase, glucose, potassium, and low-density lipoprotein. There was a remarkable elevation in the percentage of eosinophils, basophils, monocytes, and granulocyte. There were histopathological abnormalities on the kidney, lung, stomach, and small intestine. The extract is relatively safe on acute exposure but moderately toxic at higher doses on sub-acute administration, particularly to the kidney.

An Integrated Accurate-Secure Heart Disease Prediction (IAS) Model using Cryptographic and Machine Learning Methods

Syed Anwar Hussainy F,Senthil Kumar Thillaigovindan 한국인터넷정보학회 2023 KSII Transactions on Internet and Information Syst Vol.17 No.2

Heart disease is becoming the top reason of death all around the world. Diagnosing cardiac illness is a difficult endeavor that necessitates both expertise and extensive knowledge. Machine learning (ML) is becoming gradually more important in the medical field. Most of the works have concentrated on the prediction of cardiac disease, however the precision of the results is minimal, and data integrity is uncertain. To solve these difficulties, this research creates an Integrated Accurate-Secure Heart Disease Prediction (IAS) Model based on Deep Convolutional Neural Networks. Heart-related medical data is collected and pre-processed. Secondly, feature extraction is processed with two factors, from signals and acquired data, which are further trained for classification. The Deep Convolutional Neural Networks (DCNN) is used to categorize received sensor data as normal or abnormal. Furthermore, the results are safeguarded by implementing an integrity validation mechanism based on the hash algorithm. The system's performance is evaluated by comparing the proposed to existing models. The results explain that the proposed model-based cardiac disease diagnosis model surpasses previous techniques. The proposed method demonstrates that it attains accuracy of 98.5 % for the maximum amount of records, which is higher than available classifiers.

New Roles for Old Glue: Astrocyte Function in Synaptic Plasticity and Neurological Disorders

Syed M. Q. Hussaini,Mi Hyeon Jang 대한배뇨장애요실금학회 2018 International Neurourology Journal Vol.22 No.S2

Previously believed to solely play a supportive role in the central nervous system, astrocytes are now considered active players in normal brain function. Evidence in recent decades extends their contributions beyond the classically held brain glue role; it’s now known that astrocytes act as a unique excitable component with functions extending into local network modulation, synaptic plasticity, and memory formation, and postinjury repair. In this review article, we highlight our growing understanding of astrocyte function and physiology, the increasing role of gliotransmitters in neuron-glia communication, and the role of astrocytes in modulating synaptic plasticity and cognitive function. Owing to the duality of both beneficial and deleterious roles attributed to astrocytes, we also discuss the implications of this new knowledge as it applies to neurological disorders including Alzheimer disease, epilepsy, and schizophrenia.

Management of the Most Common Functional Gastrointestinal Disorders in Infancy: The Middle East Expert Consensus

Indrio, Flavia,Enninger, Axel,Aldekhail, Wajeeh,Al-Ghanem, Ghanem,Al-Hussaini, Abdulrahman,Al-Hussaini, Bakr,Al-Refaee, Fawaz,Al-Said, Khoula,Eid, Bassam,Faysal, Wafaa,Hijazeen, Ruwaida,Isa, Hasan M.A The Korean Society of Pediatric Gastroenterology 2021 Pediatric gastroenterology, hepatology & nutrition Vol.24 No.4

The occurrence of functional gastrointestinal disorders (FGIDs) is a formidable challenge for infants, parents, and healthcare professionals. Although data from the Middle East are scarce, experts consider FGIDs a prevalent condition in everyday clinical practice. The new Rome IV criteria revisited the definitions from a clinical perspective to provide a practical and consistent diagnostic protocol for FGIDs. However, the treatment practices for functional disorders vary considerably among Middle Eastern countries, often resulting in mismanagement with unnecessary investigations and treatments. In addition, the role of various treatment modalities, including probiotics such as Lactobacillus reuteri DSM 17938, in FGIDs requires further discussion and evaluation. During a consensus meeting, a locally relevant approach for treating common FGIDs such as infant regurgitation, infant colic, and functional constipation was discussed and approved by regional experts. The participants suggested a simplified treatment plan and protocol for general pediatricians and other primary care physicians managing FGIDs. This easy-to-follow standardized protocol will help streamline the initial management of this complex disorder in the Middle East region and even globally.

Histopathological Patterns of Thyroid Disease in Al-Madinah Region of Saudi Arabia

Albasri, Abdulkader,Sawaf, Zeinab,Hussainy, Akbar Shah,Alhujaily, Ahmed Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.14

Objectives: This study aimed to characterize the histopathological pattern of thyroid lesions among Saudi patients and to highlight the age and gender variations of these lesions as base line data. Materials and Methods: We retrospectively analyzed the data from thyroid specimens received at the Department of Pathology, King Fahad Hospital, Madinah, Saudi Arabia from January 2006 to December 2013. Results: The 292 thyroidectomy specimens received during the study period came from 230 (78.8%) females and 62 (21.2%) males giving a female: male ratio of 3.7:1. Age of the patients ranged from 14 to 95 years with a mean age 39.7 years. Two hundred and eleven (72.3%) cases were found to be non-neoplastic and 81 (27.7%) cases were neoplastic. The non-neoplastic group included: colloid goiter, including both diffuse and nodular goiter (170 cases; 58.2%), nodular hyperplasia (28 cases; 9.6%), Hashimoto/chronic lymphocytic thyroiditis (12 cases; 4.1%), and Grave's disease (1 case; 0.3%). In neoplastic lesions, there were 7 benign tumors and 74 malignant tumors. Among the benign tumors, 5 were follicular adenomas and 2 were Hurthle cell adenomas. Papillary carcinoma was the commonest malignant tumor accounting for 87.8% of all thyroid malignancies, followed by lymphoma, follicular carcinoma and medullary carcinoma. The size of papillary carcinoma was more than 2 cm in 40 cases (76.9%). Conclusions: Non-neoplastic thyroid lesions were more common than neoplastic ones. Colloid goiter was the most common lesion. Follicular adenoma was the commonest benign tumor and papillary carcinoma was the commonest malignant lesion. There appears to be a slightly increased trend of papillary carcinoma diagnosis, most being diagnosed at an advanced stage.