Synthesis and Comparative Analysis of Crystallite Size and Lattice Strain of Pb2Ba1.7Sr0.3Ca2Cu3O10+ Superconductor

Maher Abd Ali Hasan,Kareem Ali Jasim,Hussein Ali Jan Miran 한국재료학회 2022 한국재료학회지 Vol.32 No.2

In this article, Pb2Ba1.7Sr0.3Ca2Cu3O10+δ superconductor material was synthesized using conventional solid-state reaction method. X-ray diffraction (XRD) analysis demonstrated one dominant phase 2223 and some impurities in the product powder. The strongest peaks in the XRD pattern were successfully indexed assuming a pseudo-tetragonal cell with lattice constants of a = 3.732, b = 3.733 and c = 14.75 Å for a Pb-Based compound. The crystallite size and lattice strain between the layers of the studied compound were estimated using several methods, namely the Scherrer, Williamson-Hall (W.H), sizestrain plot (SSP) and Halder Wagner (H.W) approach. The values of crystallite size, calculated by Scherrer, W.H, SSP and H.W methods, were 89.4540774, 86.658638, 87.7555823 and 85.470086 Å, respectively. Moreover, the lattice strain values obtained by W.H, SSP and H.W methods were 0.0063240, 0.006325 and 0.006, respectively. It was noted that all crystallite size results are consistent; however, the best method is the size-strain plot because it gave a value of R2 approaching one. Furthermore, degree of crystallites was calculated and found to be 59.003321%. Resistivity analysis suggests zero-resistance, which is typical of superconducting materials at critical temperature. Four-probe technique was utilized to measure the critical temperature at onset Tc(onset), zero resistivity Tc(off set), and transition (width ΔT), corresponding to temperatures of 128 K, 116 K, and 12 K, respectively.

A Novel Road Segmentation Technique from Orthophotos Using Deep Convolutional Autoencoders

( Maher Ibrahim Sameen ),( Biswajeet Pradhan ) 대한원격탐사학회 2017 大韓遠隔探査學會誌 Vol.33 No.4

This paper presents a deep learning-based road segmentation framework from very high-resolution orthophotos. The proposed method uses Deep Convolutional Autoencoders for end-to-end mapping of orthophotos to road segmentations. In addition, a set of post-processing steps were applied to make the model outputs GIS-ready data that could be useful for various applications. The optimization of the model`s parameters is explained which was conducted via grid search method. The model was trained and implemented in Keras, a high-level deep learning framework run on top of Tensorflow. The results show that the proposed model with the best-obtained hyperparameters could segment road objects from orthophotos at an average accuracy of 88.5%. The results of optimization revealed that the best optimization algorithm and activation function for the studied task are Stochastic Gradient Descent (SGD) and Exponential Linear Unit (ELU), respectively. In addition, the best numbers of convolutional filters were found to be 8 for the first and second layers and 128 for the third and fourth layers of the proposed network architecture. Moreover, the analysis on the time complexity of the model showed that the model could be trained in 4 hours and 50 minutes on 1024 high-resolution images of size 106 × 106 pixels, and segment road objects from similar size and resolution images in around 14 minutes. The results show that the deep learning models such as Convolutional Autoencoders could be a best alternative to traditional machine learning models for road segmentation from aerial photographs.

NEW FRONTIERS IN THERMAL PLASMAS FROM SPACE TO NANOMATERIALS

MAHER I. BOULOS 한국원자력학회 2012 Nuclear Engineering and Technology Vol.44 No.1

Thermal plasma technology has been at the center of major developments over the past century. It has found numerous applications ranging from aerospace materials testing to nanopowder synthesis and processing. In the present review highlights of principal breakthroughs in this field are presented with emphasis on an analysis of the basic phenomena involved,and the potential of the technology for industrial scale applications.

Epidemiological distribution of primary central nervous system tumors in the Western Province of Saudi Arabia: a local registry from neuroscience-affiliated centers

Maher Kurdi,Nadeem Shafique Butt,Saleh Baeesa,Badrah Alghamdi,Yazid Maghrabi,Anas Bardeesi,Rothaina Saeedi,Ahmed I. Lary 한국역학회 2021 Epidemiology and Health Vol.43 No.-

OBJECTIVES: Central nervous system (CNS) tumors are a major and growing global healthcare challenge. Western Saudi Arabia has an inconsistent data registry; therefore, the epidemiology of CNS tumors is unclear across the country. This study is aimed to assemble the epidemiological matrix of CNS tumors in the Western Province of Saudi Arabia. METHODS: A retrospective analysis was performed using clinical data obtained from 3 neuroscience centers in Western Saudi Arabia in the period 2014-2019. The sample size included 663 adult and pediatric cases from the local and expatriate populations diagnosed with CNS tumors. The distributions of age, sex, clinical presentation, tumor location, type of surgery, histological subtype, genetic characteristics, and recurrence rate were explored. RESULTS: The analysis included 500 adult cases and 163 pediatric cases up to 18 years of age with a male-to-female ratio of 1.16. The mean age at diagnosis was 38.0±22.6 years. The supratentorium was the most common location (n=515, 77.7%). Most patients presented with headache (n=298, 44.9%), followed by a focal neurological deficit (19.9%). The most common primary CNS tumor was glioblastoma (n=234, 35.3%), followed by meningioma (n=100, 15.1%). The recurrence rate after surgery was estimated to be 40.9% among all CNS tumors. CONCLUSIONS: This is the first tumor registry of Western Province of Saudi Arabia that describes the distribution of primary CNS tumors and highlights their epidemiological matrix. Several incidence trends in terms of histological type, age group, sex, location, and recurrence were determined, and some genetic characteristics were recognized.

Creativity: Simulation, stimulation, and studies

Maher, Mary Lou,Bonnardel, Nathalie,Kim, Yong Se Cambridge University Press 2010 Artificial intelligence for engineering design, an Vol.24 No.2

Synthesis, CO2 Adsorption and Catalytic Properties of Porphyrin- Pyromellitic Dianhydride Based Porous Polymers

Maher Fathalla 한국고분자학회 2021 Macromolecular Research Vol.29 No.4

The synthesis, characterization and CO2 uptake tendency of a new porous organic polymer (POP) based on porphyrin-pyromellitic dianhyderide is enclosed. The reported porphyrin POP was achieved by exploiting the condensation reaction between tetraaminophenylporphyrin (TAPP) with benzenetetracarboxylic (pyromellitic) diahhydride in dry dimethylforamide (DMF). The structure of the resulting polymer was confirmed by FT-IR as well as solid state 13C cross-polarization magic angle spinning (CP/MAS) NMR studies. In addition, the post-synthetic metallation of the free-base porphyrin macrocycles of the resulting POP with either Zn or Mn metals afforded the metallo-porphyrin POP analogues in excellent yields. The morphology of the reported porphyrin POPs were investigated by scanning electron microscopy (SEM) which demonstrated the porosity of the resulting POPs. Furthermore, CO2 adsorption capabilities of the synthesized POPs were evaluated and Brunauer-Emmett-Teller (BET) surface area was found to be 542, 597 and 828 m2/g for free-base, Zn- and MnIII-POP, respectively. Finally, MnIII-POP was found to be an effective catalyst for the selective epoxidation of styrene to the corresponding epoxide.

The Impact of Collective Guilt on the Preference for Japanese Products

Maher, Amro A.,Singhapakdi, Anusorn,Park, Hyun-Soo,Auh, Sei-Gyoung Korean Academy of Marketing Science 2010 마케팅과학연구 Vol.20 No.2

Arab boycotts of Danish products, Australian boycotts of French products and Chinese consumer aversion toward Japanese products are all examples of how adverse actions at the country level might impact consumers' behavior. The animosity literature has examined how consumers react to the adverse actions of other countries, and how such animosity impacts consumers' attitudes and preferences for products from the transgressing country. For example, Chinese consumers are less likely to buy Japanese products because of Japanese atrocities during World War II and the unjust economic dealings of the Japanese (Klein, Ettenson and Morris 1998). The marketing literature, however, has not examined how consumers react to adverse actions committed by their own country against other countries, and whether such actions affect their attitudes towards purchasing products that originated from the adversely affected country. The social psychology literature argues that consumers will experience a feeling called collective guilt, in response to such adverse actions. Collective guilt stems from the distress experienced by group members when they accept that their group is responsible for actions that have harmed another group (Branscombe, Slugoski, and Kappenn 2004). Examples include Americans feeling guilty about the atrocities committed by the U.S. military at Abu Ghraib prison (Iyer, Schamder and Lickel 2007), and the Dutch about their occupation of Indonesia in the past (Doosje et al. 1998). The primary aim of this study is to examine consumers' perceptions of adverse actions by members of one's own country against another country and whether such perceptions affected their attitudes towards products originating from the country transgressed against. More specifically, one objective of this study is to examine the perceptual antecedents of collective guilt, an emotional reaction to adverse actions performed by members of one's country against another country. Another objective is to examine the impact of collective guilt on consumers' perceptions of, and preference for, products originating from the country transgressed against by the consumers' own country. If collective guilt emerges as a significant predictor, companies originating from countries that have been transgressed against might be able to capitalize on such unfortunate events. This research utilizes the animosity model introduced by Klein, Ettenson and Morris (1998) and later expanded on by Klein (2002). Klein finds that U.S. consumers harbor animosity toward the Japanese. This animosity is experienced in response to events that occurred during World War II (i.e., the bombing of Pearl Harbor) and more recently the perceived economic threat from Japan. Thus this study argues that the events of Word War II (i.e., bombing of Hiroshima and Nagasaki) might lead U.S. consumers to experience collective guilt. A series of three hypotheses were introduced. The first hypothesis deals with the antecedents of collective guilt. Previous research argues that collective guilt is experienced when consumers perceive that the harm following a transgression is illegitimate and that the country from which the transgressors originate should be responsible for the adverse actions. (Wohl, Branscombe, and Klar 2006). Therefore the following hypothesis was offered: H1a. Higher levels of perceived illegitimacy for the harm committed will result in higher levels of collective guilt. H1b. Higher levels of responsibility will be positively associated with higher levels of collective guilt. The second and third hypotheses deal with the impact of collective guilt on the preferences for Japanese products. Klein (2002) found that higher levels of animosity toward Japan resulted in a lower preference for a Japanese product relative to a South Korean product but not a lower preference for a Japanese product relative to a U.S. product. These results therefore indicate that the experience of collective guilt will lea 阿拉伯人?合抵制丹??品, 澳大利?人?合抵制法??品, 而中?人??日本?品, ?些是?家?的??行?影?消?行?的案例. ?意文?中已考??消?者?其他?家??行?的反?, 以及???意如何影?消?者????家?品的?度和?向. 例如, 中?消?者不愿??日本?品, 是由于日本人在第二次世界大?中的暴行, 以及不平等的??往?(Klein, Ettenson and Morris 1998). 然而在市???文?中, 却?有考??那些?他??施??行?的?家消?者的反?, ?些??行?是否?影?他???受害??品的?度. 社?心理?文???, 消?者面???的??行??, ??生一?集?犯罪感. 集?犯罪感源于???成?????要??害其他??的行????所?生的痛苦感(Branscombe, Slugoski, and Kappenn 2004). 案例包括美?人由于美?在Abu Ghraib??的暴行而?生犯罪感(Iyer, Schamder and Lickel 2007), 荷?由于?去?印度尼西?的占?而?生犯罪感(Doosje et al. 1998). 本?究的主要目的是考???家成??他?有??行??消?者的感知, ??感知是否?影?他?????家?品的?度. 更准?的?, 本?究的目?之一是考?集?犯罪感的感知前提, 以及??家成??他?有??行??, 人?的情?反?. ?一?目?是考?集?犯罪感如何影?消?者?????品的感知和?向. 如果集?犯罪感能起到明?的?言作用, ????方的公司可能????不幸的事件中受益. 本?究利用了由Klein, Ettenson and Morris (1998)提出??Klein (2002)?展的?意模式. Klein??美?消?者?日本人?有?意, 起因是二?期?的事件(如日???珍珠港)和近年?日本的??威?. 因此本?究??, 二??的事件(如???崎的原子?爆炸)可能?致美?消?者的集?犯罪感. 曾有?一系列的三?假?, 第一?假??于集?犯罪感的前提. 之前有?究???消?者感知到侵害造成的非法?害, ?且??侵犯者?自的?家??此??, 集?犯罪感就?生了(Wohl, Branscombe, and Klar 2006). 因此提出下列假?: 假?1a: 感知到的?害非法性越高, 集?犯罪感越强烈. 假?1b: ?任越大, 集?犯罪感也肯定越强烈. 第二?和第三?假??于集?犯罪感??向日本?品的影?. Klein (2002)???日本的?意越强, 相比????品?日本?品的?向越小, 但相比?美??品?日本?品的?向?未?小. ?些?果?明集?犯罪感存在?, 消?者在??日本?品和???品??更?向于前者, 但在??日本?品和美??品??未受影?. 假?2: 集?犯罪感???日本?品的?向大于???品有?, 但???日本?品的?向大于美??品无?. 假?3: 集?犯罪感???日本?品的?向大于???品有?, ?且??品的判?和?意保持不?. 有?一???????假?. 使被??者面??生在二?中的??事件, ?而?生非法?害和?任. ???由一家美?的消?者??小?收集?据, ????象?机分配到低等??任和?法情?(n=259)或高等??任和?法情?(n=268). ??假??系?, ?用到?在?量??方程模式(LVSEM). 第一?假?得到了支持, 美?人因二?中?日本人的?害而?生的?害非法性和?任都?集?犯罪感有??影?. 第二?假?也得到了支持, 集?犯罪感???日本?品的?向大于???品有?, 但???日本?品的?向大于美??品无?. 最后, 第三?假?也得到了支持, 集?犯罪感???日本?品的?向大于???品有?, 同??影?人??日本?品的判?和?意. 由?些

Why monetary system failed and How to restructure it

Maher Kababji 국제융합경영학회 2015 융합경영연구 Vol.3 No.1

Present monetary system is based on fallacies. The purpose of this article is to highlight the pitfalls in economic thinking. The article shows that this way of thinking leads to the creation of inflation which is the root of all evil. The analysis proceeds in different approach to the contemporary theory of money. An inflation- free monetary system is introduced. Monetary system is the set of mechanisms that controls money. In this broad sense, monetary system can be divided into three different systems. Each of them has different goal; National monetary system which aims to raise sufficient funds in order to reach an optimal level of output growth that maintains full employment and satisfies the economic requirements of the community. National redistribution system which aims to redistribute funds in order to sustain individuals at or above a specified material standard of living, and enable government to provide public services. International monetary system which aims to preserve rights of parties in foreign exchange transactions.

Techniques, Clinical Applications and Limitations of 3D Reconstruction in CT of the Abdomen

Maher, Michael M.,Kalra, Mannudeep K.,Sahani, Dushyant V.,Perumpillichira, James J.,Rizzo, Stephania,Saini, Sanjay,Mueller, Peter R. Korean Radiological Society 2004 Korean Journal of Radiology Vol.5 No.1

Monitoring of Genetically Modified Food and Feed in the Tunisian Market Using Qualitative and Quantitative Real-time PCR

Maher Chaouachi,Nesrine Nabi,Ahmed Ben Hafsa,Mohamed Salem Zellama,Fethia Skhiri,Khaled Saïd 한국식품과학회 2013 Food Science and Biotechnology Vol.22 No.4

Genetically modified organisms (GMO) invade more and more the agricultural production in the world. Although there are no legislations on GM labeling and cultivation of GM crops in Tunisia, the present study aims to check the status of GMO in Tunisian market using qualitative and quantitative real time-PCR (QRT-PCR). Three-hundred-sixty five samples were collected and different DNA extraction methods were adapted and optimized. Specific primers targeting 35S promoter from Cauliflower mosaic virus (CaMV) and nopaline synthase terminator from Agrobacterium tumefaciens (At) were used for the detection of the GMO insert and Taxon specific primers for the detection of plant species. Validated Taqman® probes (EU-RL) targeting event specific regions of the maize events MON810, Bt11, and the soybean event RRS were used for the quantification studies. Seven food and feed products showed different amounts of RRS (1.9%), MON810 (2.1%), and Bt11 (1.6%). The results demonstrate for the first time the presence of GMO in Tunisian markets reinforcing the need for the development of accurate quantitative methods in routine analyses.