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Experimental investigation of base pressure using micro jets at low supersonic mach numbers with sudden expansion
Full text linkThis exploration shows the consequences of an effort to regulate base pressure inside the recirculation sector. The study focuses on the efficacy of stream regulators in controlling base pressure in a duct with abrupt expansion. Tiny jets of 1 mm in diameter are placed at a period of ninety degrees at a pitch circle diameter of 13 mm. The Mach numbers considered range from 1.25 to 1.6. Circular brass pipes were employed with the nozzles, and the diameter ratio of the tubes was 1.6, 1.8, 2.2, and 2.5. The L/D ratio considered was from 1 to 10, and the nozzle pressure ratio used ranged from 3 to 11. The base pressure varies with the expansion level and the nozzle’s inertia levels. In establishing the base pressure, the nozzle pressure ratio plays a vital part in setting its scale. While the flow was released into the duct with the area ratios, it remained connected to the duct at all inertial levels and at the NPRs assessed in the present study. Further, it is observed that the nozzle pressure ratio is a vital parameter that significantly influences base pressure and control capability
From red to blue: a podium finish that shaped future cybersecurity professionals
No full textThe articles featured in this issue showcase inspiring staff and students accomplishments, meaningful community engagement, and practical applications of knowledge that demonstrate our commitment to excellence and social
responsibility
Jom cari kerja!
No full textJom Cari Kerja ialah sebuah buku panduan yang amat berfaedah kepada pencari kerja khususnya lepasan sekolah dan graduan. Secara kebiasaannya, lepasan sekolah, iaitu mereka yang baru tamat peperiksaan SPM dan STPM serta tercari-cari pekerjaan, tentu memerlukan suatu panduan lengkap bagi memohon pekerjaan. Begitu juga dengan para graduan sama ada mereka yang telah menamatkan pengajian pada peringkat sijil, diploma atau ijazah. Kedua-dua golongan ini biasanya amat memerlukan suatu panduan yang boleh
membimbing mereka daripada mula memohon pekerjaan, menghadiri temu duga dan memulakan pekerjaan. Oleh yang demikian, buku Jom Cari Kerja! amat bertepatan dengan keperluan lepasan sekolah dan para graduan sebelum mereka memulakan kerjaya masing-masing. Buku Jom Cari Kerja! ini dilengkapi gambar-gambar, rajah dan jadual yang jelas serta tepat bagi panduan lepasan sekolah dan para
graduan. Semua paparan di dalam buku ini dapat membantu lepasan sekolah dan para graduan daripada peringkat awal mereka ingin memohon pekerjaan, persiapan menghadapi temu duga dan seterusnya tatacara ketika menghadiri temu duga. Sehubungan itu,buku kecil ini mengandungi 8 bab, iaitu Bab 1: Kenali Dunia Pekerjaan; Bab 2: Kenali Diri; Bab 3: Persediaan Sebelum Mencari Pekerjaan;Bab 4: Strategi Mencari Pekerjaan; Bab 5: Strategi Memohon Pekerjaan;
Bab 6:Tips Persediaan Menghadiri Temu Duga; Bab 7: Tips Semasa Temu Duga; Bab 8:Pasca Temu Duga; dan Bab 9: Kemahiran Insaniah untuk Keperluan Industri. Semoga buku ini bermanfaat untuk semua pencari kerja!
Robotics and the Islamic worldview: a Tawhidic epistemology framework for ethical and human-centered technological innovation
Full text linkThis paper explores the integration of robotics within the Islamic worldview, proposing a Tawhidic epistemology as a foundational framework for ethical and human-centered technological innovation. Modern robotics influences nearly every sector—from manufacturing and medicine to education and environmental stewardship—yet its rapid evolution generates profound moral and social challenges. Drawing upon the principles of Tawhid (Oneness of God), Khilafah (stewardship), and Maqasid al-Shariah (objectives of Islamic law), this paper examines how Islamic epistemology unifies scientific progress with divine purpose. Through philosophical analysis and illustrative examples, it argues that robotics, when guided by Tawhidic consciousness, becomes an act of stewardship (amanah) rather than domination. The paper concludes that Islamic ethics can provide a comprehensive moral compass for robotics governance—one grounded in justice (‘adl), compassion (rahmah), and sustainability (istiqamah)
Personal interest and persistence among female engineering doctoral Students at an International Islamic University in Malaysia
No full textAlthough women’s participation in STEM has expanded, doctoral persistence remains influenced by complex psychological and contextual factors. In Malaysia, existing research largely emphasizes undergraduate retention, with limited qualitative attention to women’s persistence at the PhD level. This study explores the role of personal interest in shaping persistence among female engineering doctoral students at the International Islamic University Malaysia (IIUM). Guided by Social Cognitive Career Theory (SCCT), a qualitative approach was employed using semi-structured interviews with nine female lecturers in multiple engineering disciplines. Data were analyzed through thematic analysis. Findings indicate that personal interest operates as a dynamic and developmental mechanism across four dimensions: early formation through exposure and encouragement; identity-integrated interest shaped by belonging and academic success; value-integrated interest linked to societal contribution; and sustained passion functioning as motivational energy. Interest evolved from early academic socialization into a deeply internalized commitment that reinforced persistence throughout prolonged doctoral challenges. The findings extend SCCT by conceptualizing interest as an evolving psychological process central to doctoral completion in STEM within a Malaysian higher education context
From ideation to execution: unleashing the power of generative AI in modern digital marketing and customer engagement - a systematic literature review and case study
No full textGenerative Artificial Intelligence (GAI) is revolutionizing digital marketing by auto-content creation, personalized customer experience, and data-driven decisions. This study conducts a systematic literature review and case study analysis to explore GAI applications, benefits, and challenges in modern digital marketing. Drawing on an extensive analysis of academic journals and industry publications, the current research examines leading GAI software such as ChatGPT, DALL-E, MidJourney, Jasper.ai, and Synthesia based on how they aid in content creation, visual design, and video production. The research also provides real-world case studies in multiple industries, such as retail and fashion, food and beverages, and travel and tourism. The case findings illustrated how GAI augments marketing automation, facilitates customer engagement, and amplifies brand engagement, resulting in greater customer satisfaction, higher conversion rates, and better campaign performance. Although it has several benefits, the adoption of GAI is hampered by several critical barriers, such as data privacy, ethical risks, worker resistance, quality control issues, and infrastructure constraints. This research pinpoints these essential challenges and offers practical solutions. It provides actionable insights for businesses seeking to leverage GAI for competitive advantage in the evolving digital landscape by bridging the gap between theory and practice. The findings contribute to the growing discourse on AI-driven marketing strategies and lay the foundation for future research on GAI’s long-term impact on consumer engagement and brand loyalty
Base pressure control through micro jets at supersonic Mach numbers using experimental and machine learning approach
No full textSudden expansion phenomena are prevalent in defense and automotive applications, where flow separation at the blunt bases of structures such as fuselages, missiles, and rockets creates low-pressure recirculation zones, significantly reducing base pressure and increasing drag. This study presents active control methods using microjets to regulate base pressure, employing experimental and machine learning approaches. Experiments were conducted using duct diameters of 16 mm, 18 mm, 22 mm, and 25 mm, a level of expansion, the Nozzle
pressure ratio ranging from 3 to 11, Mach numbers (1.25, 1.3, 1.48, 1.6, 2.0, and 3.0), and length-to-diameter ratios. Ratios (10–1) were varied to evaluate their impact on flow evolution and base pressure. Active control was achieved using micro-jets of 0.5 mm radius, positioned at 90◦ intervals along a pitch circle with a radius of 0.65 times the nozzle exit diameter. Micro-jets significantly increased the base pressure under favorable pressure-gradient conditions for Mach numbers 1.25, 1.3, 1.48, 1.6, and 2.0. At Mach M = 3, the control is ineffective as the
NPRs are such that the nozzle flow remains over-expanded. Furthermore, machine learning (ML) algorithms were utilized to predict base pressure outcomes and optimize control strategies. These algorithms demonstrated high predictive accuracy, as evidenced by low error rates, indicating their reliability in high-speed flow-control applications. The findings reveal that base pressure is strongly influenced by nozzle pressure ratio, Mach number, L/D ratio, and duct area ratio. The study presents cost-effective, energy-efficient methods to
enhance base pressure, offering critical insights into the aerodynamic optimization of high-speed systems. This
comprehensive approac
Phonology fossilization effect among Arabic native speaker on the acquisition of Malay velar and alveopalatal nasal sound
Full text linkIn learning a second language, speakers usually move between their first language (L1) and the target language (L2). However, the interlanguage process is a transitional linguistic system marked by enduring and resistant errors known as language fossilization is an important stage that is frequently missed. This study examines whether Arabic Native speakers that live in Malaysia acquire novel L2 sounds, the Malay velar nasal \ŋ\ and alveopalatal nasal /ɲ /. Alveolar nasal sound /n/ is a part of both Arabic and Malay inventories while \ŋ\ and /ɲ / sounds which consist of tautosyllabic velar and palatal nasal and glide element are not from Arabic inventory. These crosslinguistic differences present potential difficulty for Arabic speakers due to their phonetic constraints. With these crosslinguistic disparity, this study aims to identify did Arabic native speakers who live in Malaysia facing language fossilization to produce acoustically Malay \ŋ\ and /ɲ / sound or not. Their speech was recorded and analysed using Praat software and measured by formants, duration, and spectrograms of the following vocalic portion as acoustic indices of the Malay \ŋ\ and /ɲ / sound. Findings show that native speakers produce an acoustically distinct Malay sounds of \ŋ\ and /ɲ / due to phonology fossilization from their mother language sound /n/. These findings have significant implications for teaching pronunciation in Malay as a second language, particularly when it comes to dealing with foreign learners’ interlanguage phenomena