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"Sulaiman, N"
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الحياة قاسية : قصة عضو مهتد في فرقة (الأوتلو)
قتل والداه أمام عينيه وهو ما زال يافعا، ترك تجارة المخدرات والعنف اللذين كانا كطفليه المدللين، اتخذ من غناء الراب متنفسا له، ليصادف بعد ذلك أسطورة غناء الراب العالمي، وبينما هو في معترك البحث عن السلام الداخلي ظل يحبطه أسلوب الحياة المزيف، والغضب الذي لا تخبو جذوته.الحياة قاسية، سيرة ذاتية تروي حياة مؤتة (نابليون) بيل، العضو السابق في مجموعة توباك شاكور للراب المعروفة بـ (أوت لاز) Outlawz، يظهر الكتاب صوت مؤتة الحقيقي بصورة مبتكرة عندما يعرض مشاهد تاريخية وأكاديمية حول مظاهر حساسة في المجتمع الأميركي، مثل: العلاقات العنصرية، وعنف العصابات، والصحة النفسية، وريادة الأعمال، والحياة الأسرية. ستأسرك القصص التي تقرؤها من دون شك، وستلامس جوهرك وأنت تحاول أن تكتشف كيف نجا (نابليون) بحياته في ظل الصعوبات التي لا تحتمل، وفي مسيرة حياته خارطة طريق علاجية لأي شخص يعاني عاطفيا أو نفسيا أو روحيا أو غير ذلك؛ إذ تترك هذه المسيرة فينا شعورا واحدا هو أن الأمل لا ينقطع أبدا.يروي مؤته بيل، العضو السابق في مجموعة توباك التابعة لـ(أوت لاز) Outlawz الأسطورية، روايات مثيرة للاهتمام وثاقبة وتقشعر منها الأبدان أحيانا.
Book
Influence of crystal structure of nanosized ZrO2 on photocatalytic degradation of methyl orange
Nanosized ZrO2 powders with near pure monoclinic, tetragonal, and cubic structures synthesized by various methods were used as catalysts for photocatalytic degradation of methyl orange. The structural and textural properties of the samples were analyzed by X-ray diffraction, Raman spectroscopy, TEM, UV-vis, X-ray photoelectron spectroscopy (XPS), and N2 adsorption measurements. The performance of synthesized ZrO2 nanoparticles in the photocatalytic degradation of methyl orange under UV light irradiation was evaluated. The photocatalytic activity of the pure monoclinic ZrO2 sample is higher than that of the tetragonal and cubic ZrO2 samples under optimum identical conditions. The characterization results revealed that monoclinic ZrO2 nanoparticles possessed high crystallinity and mesopores with diameter of 100 Å. The higher activity of the monoclinic ZrO2 sample for the photocatalytic degradation of methyl orange can be attributed to the combining effects of factors including the presence of small amount of oxygen-deficient zirconium oxide phase, high crystallinity, large pores, and high density of surface hydroxyl groups.
Journal Article
Yttrium Oxide Supported La2O3 Nanomaterials for Catalytic Oxidative Cracking of n-Propane to Olefins
La
2
O
3
nanorods were prepared by simple hydrothermal synthesis method. Yttrium oxide (1, 3, 5 and 7 wt%) supported La
2
O
3
and SO
4
2−
incorporated La
2
O
3
nanorods were prepared impregnation method and used as catalysts in oxidative cracking of
n
-propane. The pure La
2
O
3
nanorods exhibited 15%
n
-propane conversion with 22% olefins (ethane and propene) selectivity. Considerable improvement in
n
-propane conversion was observed in case of 3 wt% yttrium oxide supported on La
2
O
3
nanorods (25% conversion of
n
-propane and 36% selectivity to olefins) at reaction temperature of 550 °C. Interestingly, 5 wt% yttrium oxide supported 10 wt% SO
4
2−
/La
2
O
3
nanorod sample exhibited superior performance in
n
-propane conversion (42%) and olefins selectivity (54%). The yttrium oxide loading and sulfation of La
2
O
3
nanorods influenced the catalytic activity. The characterization of synthesized nanomaterials was performed using elemental analysis, XRD, FT-IR, N
2
-physisorption, SEM, XPS and H
2
-TPR techniques. The obtained results indicated that yttrium oxide was highly dispersed over the La
2
O
3
nanorods because of strong interaction between the two rare earth metal oxides. Additionally, deposition of yttrium oxide to sulfated La
2
O
3
nanorods increased the surface area and the amount of Lewis acid sites (for the activation of
n
-propane) on La
2
O
3
nanorods. Yttrium oxide supported sulfated La
2
O
3
catalyst showed no deactivation during the 24 h of reaction and without coke formation.
Graphic Abstract
Journal Article
Tungsten Doped TiO2 with Enhanced Photocatalytic and Optoelectrical Properties via Aerosol Assisted Chemical Vapor Deposition
Tungsten doped titanium dioxide films with both transparent conducting oxide (TCO) and photocatalytic properties were produced
via
aerosol-assisted chemical vapor deposition of titanium ethoxide and dopant concentrations of tungsten ethoxide at 500 °C from a toluene solution. The films were anatase TiO
2,
with good
n
-type electrical conductivities as determined
via
Hall effect measurements. The film doped with 2.25 at.% W showed the lowest resistivity at 0.034 Ω.cm and respectable charge carrier mobility (14.9 cm
3
/V.s) and concentration (×10
19
cm
−3
). XPS indicated the presence of both W
6+
and W
4+
in the TiO
2
matrix, with the substitutional doping of W
4+
inducing an expansion of the anatase unit cell as determined by XRD. The films also showed good photocatalytic activity under UV-light illumination, with degradation of resazurin redox dye at a higher rate than with undoped TiO
2
.
Journal Article
Students' Perceptions of Using Information and Communication Technology as an E-Learning Method
Nowadays, ICT is used as a catalyst in e-learning to improve the quality of the teaching and learning processes. E-learning primarily incorporates interactive multimedia elements to involve and appreciate learners in the learning process. Multimedia applications provide interactive features, navigation, attract students and also help students to focus more during the learning process. This paper focuses on student perceptions of e-learning as a method of teaching and learning. The study sample consists of two groups of students: group A for traditional approach of learning and group B for e-learning approach. Moodle is used as a platform for e-learning. The research tool uses questionnaires and log data from the activity of Moodle. The questionnaire results are analyzed using SPSS software. From the analyzed data on student's perception of traditional learning, 53% of students deny that this approach allows them to develop their current understanding of learning. 26.7% of respondents strongly disagree that content is appealing in traditional teaching delivery. A total of 55% of students agree to the use of multimedia e-learning to increase student understanding. Multimedia elearning was interesting and enjoyable to use, according to the findings, 75% of respondents agreed. The study shows that the student's perception of multimedia e-learning helps to increase the student's performance. The result has shown that students have demonstrated better learning performance through e-learning.
Journal Article
Analysis of Non-Invasive Fingerprint Thickness Based Authentication Method Utilizing Near Infrared Spectroscopy
Fingerprints are a popular method of biometric based authentication. However, methods currently in use are susceptible to being bypass through the use of forgeries of the fingerprint pattern. Measuring the epidermal thickness of the fingerprint is a solution to the issue, as there are no current ways for a third-party to precisely replicate the thickness measurements. Near-Infrared Diffused Reflectance (NIR-DR) spectroscopy is the proposed method of measuring fingerprint thickness. Reflectance reading is taken at 5 specific wavelength points to generate a simplified plot for comparison. Thickness measurement is gauged by calculationg change in reflectance percentage between the 800-900nm range. Data gathered showed variation in the reflectance spectra that was unique to each subject. Application for a fingerprint thickness-based authentication method is plausible but require additional research with a larger population sample and looking into the effects of age and skin colour for their effect on epidermal thickness.
Journal Article
Radiation-induced degradation in optoelectronic devices for satellite applications: a review
Optoelectronic devices play a crucial role in the functionality of satellite systems, particularly in optical communication. However, these devices face significant challenges due to radiation-induced degradation, which can compromise their performance and reliability in the harsh space environment. This review provides a comprehensive analysis of the impacts of various types of radiation, including protons, electrons, gamma, and neutrons, on optoelectronic components used in satellite applications. The review discusses the mechanisms through which radiation interacts with semiconductor materials, leading to phenomena such as ionization and charge build-up, which can result in the deterioration of key performance parameters such as optical efficiency, signal integrity, and operational lifespan. The review delves into the specific effects of radiation on critical optoelectronic components, including photodetectors, light-emitting diodes (LEDs), and laser diodes, with a particular focus on inter-satellite optical wireless communication systems. By analyzing the existing literature, this review traces the evolution of research on radiation effects, highlighting trends in understanding and mitigating radiation-induced damage. It also identifies gaps in current knowledge and suggests areas for future investigation to enhance the resilience of optoelectronic devices against radiation. This effort provides valuable insights that can inform the design and development of more robust optoelectronic systems capable of maintaining reliable operation in radiation-rich environments, thereby contributing to the advancement of satellite communication technologies.
Journal Article
Effect of synthesis methods for mesoporous zirconia on its structural and textural properties
Zirconia was synthesized by sol–gel and post-hydrothermal treatment under autogenous pressure in order to study the effect of synthesis methods on its structural and textural properties. On the basis of thermal analysis, in situ X-ray diffraction and Raman spectroscopy techniques, the synthesis processes exhibit similar thermal behavior and zirconia phase transformation. The effect of in situ calcination temperature on the crystallization behavior, crystal phase transition, and crystallite size analysis was studied. The results obtained revealed that amorphous zirconia transformed into tetragonal phase above 400 °C and thermally stabilized up to 700 °C. A biphasic mixture of tetragonal and monoclinic zirconia was formed at 750 °C. Activation energy of sintering due to grain growth mechanism predicted that the zirconia phase transformation is due to the increase in the crystallite size of tetragonal phase above its critical size. The post-hydrothermal treatment resulted in the formation of high surface area mesoporous zirconia (213 m
2
g
−1
). Upon increasing the calcination temperature, a pronounced decrease in the specific surface area of zirconia samples due to sintering process and phase transformation.
Journal Article
An azaspirane derivative suppresses growth and induces apoptosis of ER-positive and ER-negative breast cancer cells through the modulation of JAK2/STAT3 signaling pathway
Persistent activation of signal transducer and activator of transcription 3 (STAT3) is associated with the progression of a range of tumors. In this report, we present the anticancer activity of 2-(1-(4-(2-cyanophenyl)1-benzyl-1H-indol-3-yl)-5-(4-methoxy-phenyl)-1-oxa-3-azaspiro(5,5)undecane (CIMO) against breast cancer cells. We observed that CIMO suppresses the proliferation of both estrogen receptor-negative (ER−) (BT-549, MDA-MB-231) and estrogen receptor-positive (ER+) (MCF-7, and BT-474) breast cancer (BC) cells with IC50 of 3.05, 3.41, 4.12 and 4.19 μM, respectively, and without significantly affecting the viability of normal cells. CIMO was observed to mediate its anti-proliferative effect in ER− BC cells by inhibiting the phosphorylation of JAK2 and STAT3 proteins. Quantitative PCR analysis demonstrated that CIMO decreases the relative mRNA expression of genes that are involved in cell cycle progression (CCND1) and cell survival (BCL2, BCL-xL, BAD, CASP 3/7/9, and TP53). In addition, CIMO was observed to arrest BC cells at G0/G1 phase and of the cell cycle. Furthermore, CIMO suppressed BC cell migration and invasion with concordant regulation of genes involved in epithelial to mesechymal transition (CDH1, CDH2, OCLN and VIM). Thus, we report the utility of a synthetic azaspirane which targets the JAK-STAT pathway in ER− BC.
Journal Article