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ڈاکٹر سید عابد حسین

ڈاکٹر سید عابد حسین
یہ سطریں لکھی جارہی تھیں کہ ڈاکٹر عابد حسین کے انتقال پر ملال کی خبر ملی، وہ جامعہ ملیہ کے جان نثار ڈاکٹر ذاکر حسین مرحوم کے رفیق قلبی، ایک بہت بڑے محب وطن، ایک قبل قدر فلسفی، اردو زبان کے مایہ ناز ادیب، ایک ماہر مترجم، ایک بلند پایہ مصنف، ایک محتاط اہل قلم، اسلام اور عصر جدید، پھر انگریزی رسالہ موڈرن اسلام کے صاحب دل اڈیٹر اور انسانی اخلاق کے بعض دلآویز اوصاف کے حامل کی حیثیت سے اپنے ہم وطنوں، معاصروں اور قدردانوں میں برابر یاد کئے جائیں گے دعا ہے کہ اﷲ تبارک و تعالیٰ ان کو کروٹ کروٹ جنت نعیم عطا فرمائیں۔ (صباح الدین عبدالرحمن، دسمبر ۱۹۷۸ء)

 

ڈاکٹر سید عابد حسین
ڈاکٹر سید عابد حسین مرحوم کی وفات کو کم و بیش ایک مہینہ ہوچکا ہے، مگر اب تک دل ان کی جدائی پر تیار نہیں ہے، ان کا مسکراتا ہوا چہرہ ہر وقت نگاہ کے سامنے رہتا ہے، ان کی شفقت و محبت اور عنایت و کرم فرمائی رہ رہ کر یاد آتی ہے، اور ان کی دل آویز گفتگو کی آواز کانوں میں گونجتی رہتی ہے، وہ میرے استاد بھی تھے، اور محسن و مربی بھی تقریباً ۴۸ برس یہ روابط اس طرح قائم رہے کہ نہ میری عقیدت میں کوئی فرق آیا نہ ان کی شفقت میں کوئی کمی محسوس ہوئی، ان کے نام سے واقفیت تو ندوہ کی طالب علمی ہی کے زمانہ میں ہوگئی تھی، رسالہ جامعہ میں ان کے مضامین بھی پڑھے تھے، اور ان کی کتاب تاریخ فلسفہ اسلام بھی اسی زمانہ میں نظر سے گزری تھی، یہ اگرچہ طبع زاد نہیں تھی، بلکہ مشہور مستشرق دی بوئر کی کتاب کا ترجمہ تھی مگر ڈاکٹر صاحب نے اس خوش اسلوبی کے ساتھ اسے اردو...

Are we geared for the upcoming challenges by nCoV-19 or is it still grim news…?

The novel Corona Virus (nCoV-2019), clouded the entire world during the year 2020; with its emergence in December 2019 from Wuhan, China. The nCoV-19 is a novel variant of the Coronavirus family, with its predecessors been implicated for the pandemics of Middle East Respiratory Syndrome (MERS-CoV) and Severe Acute Respiratory Syndrome (SARS-CoV); that caused flu-like condition and respiratory distress symptoms [1-6]. The viral strain also intrudes on extra-pulmonary relevance; being involved with deranging immunity as evidenced by lymphopenia and a prolonged prothrombin time; it impacts cardiomyocytes and pancreatic tissue directly [7-11]. These implications of nCoV-19 does suggest a long-term relevance of the disease profile. The emergenceof nCoV-2019 was quick to gain a pandemic status worldwide. An immense shift in the influx of the type of patients was observed, that imparted a false impression of a reduction in cardiovascular and metabolic patient presentation; formerly that had been the majority engaging the worlds’ healthcare facility. But as the world prepares itself for a possible second wave of the n-CoV-19, a prudent approach would be to remind us of the history lessons from the previous corona-led pandemic, such as MERS and SARS. This editorial will emphasize on channeling our focus to nCoV-19 implications on cardiovascular and metabolic disorders. The pandemics of SARS-CoV during 2002-2003 and MERS-CoV in 2012 highlight the long term relevance of coronavirus to cardiac and metabolic disease pathologies, both during and in the aftermath of these pandemics [3]. The SARS-CoV had demonstrated an increase of cardiovascular problems by 44%, hyperlipidemia by 68% and diabetes mellitus by 60%, in people who had recovered from the viral attack [12, 13]. Likewise, MERS-CoV had also embarked an increase of cardiac disorders by 30% and hypertension by 50% and diabetes mellitus by 50% [3, 8, 9]. Published research on nCoV-19 has hinted for a similar rising trend of cardiovascular and metabolic complexities. An increase in cardiac troponin level is observed with increased cases of myocarditis and heart failure [14]. A 20% increase in the incidence of diabetes and a 40 % rise in cardiovascular and cerebrovascular diseases is observed with nCoV-19 [8, 9]. Little do we comprehend that the involvement of angiotensin converting enzyme 2 (ACE2) receptors could play havoc on endothelium, kidney, intestine, liver and any other organ [15]. The nCoV-19 has thrown a curveball to the realm of the worldwide health and financial setting. Even with the current economic predicament it does seems prudent to be prepared in advance for the long term consequences of this pandemic. The bigger question would be to, not just direct our efforts at countering the possible second wave of nCoV-19 but also for the possible chaos of cardiovascular and metabolic disease outfall, impacting the world health system.

Deposition of Nanostructured Magnetic Thin Films

The PhD research work presented in this thesis is motivated by remarkable structural and magnetic properties of epitaxial ferromagnetic layer on semiconductor or insulator heterostructures which are important for magneto-electronic device applications. This thesis reports findings of different epitaxial heterostructures, namely Fe/MgO/GaN(0001), Ni20Fe80/MgO(111), Ni20Fe80/Si(111), and Ni20Fe80/Au/Si(111) grown by Molecular Beam Epitaxy (MBE). First experiment presents structural and magnetic investigation of fully epitaxial Fe/MgO/GaN heterostructure grown by molecular beam epitaxy. In-situ reflection high energy electron diffraction (RHEED) and ex-situ X-ray diffraction (XRD) measurements indicate epitaxial Fe(110) films on top of an epitaxial 2 nm MgO(111) tunnel barrier on GaN(0001). X-ray reflectivity (XRR) measurements confirm a roughness of approximately 0.3 nm and 0.7 nm for the MgO/GaN and the Fe/MgO interfaces, respectively. Results of insitu magneto-optical Kerr effect (MOKE) measurements indicate that 1 nm thick Fe film shows signs of in-plane ferromagnetism at room temperature. Vibrating sample magnetometer (VSM) measurements determine the saturation magnetisation of the 5 nm thick film to be 1659 ± 100 emu/cm3 and show that this system has a predominant uniaxial anisotropy contribution despite the presence of cyclic twinned crystals. We estimate the values of effective uniaxial ( ) and cubic ( ) anisotropy constants to be 11700 ± 170 erg cm-3 and - 3300 ± 700 erg cm-3 by fitting the angular dependence of the magnetising energy. In the second experiment, first time epitaxial thin films of Ni80Fe20 (Permalloy, Py) are prepared using molecular beam epitaxy at room temperature on MgO(111) substrates. X-ray diffraction graphs confirm permalloy films of (111) phase having fcc structure. Phi scans at the Py (200) peak position show that the Py layer grown on MgO substrate is epitaxially oriented. Room temperature vibrating sample magnetometer measurements indicate increase in remanent and saturation magnetisation with the increase in thickness of magnetic layer. Magneto-optical Kerr effect measurements along various azimuthal angles showed dominant uniaxial anisotropy. Superconducting quantum interference device (SQUID) measurement of thinnest permalloy film 0.6 nm shows an out of plane anisotropy.
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