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- 검색키워드
- 저자 : Syed Ahmad Ali (검색결과 12 건)
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Ahmad, Rizwan,Anwar, Muhammad Shoaib,Kim, Jae,Song, In-Hyuck,Abbas, Syed Zaighum,Ali, Syed Ahmad,Ali, Fahad,Ahmad, Jamil,Bin Awais, Hasan,Mehmood, Mazhar Elsevier 2016 CERAMICS INTERNATIONAL Vol.42 No.16
<P><B>Abstract</B></P> <P>Bimodal porous structures were prepared by combining conventional sacrificial template and partial sintering methods. These porous structures were analysed by comparing pore characteristics and gas permeation properties of alumina/mullite specimens sintered at different temperatures. The pore characteristics were investigated by SEM, mercury porosimetry, and capillary flow porosimetry. A bimodal pore structure was observed. One type of pore was induced by starch, which acted as a sacrificial template. The other pore type was due to partial sintering. The pores produced by starch were between 2 and 10µm whereas those produced by partial sintering exhibited pore size of 0.1–0.5µm. The effects of sintering temperature on porosity, gas permeability, and mullite phase formation were studied. The formation of the mullite phase was confirmed by XRD. Compressive strengths of 37.9MPa and 12.4MPa with porosities of 65.3% and 70% were achieved in alumina and mullite specimens sintered at 1600°C.</P>
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Syed Ahmad Ali,Umair Ali 대한공간정보학회 2017 Spatial Information Research Vol.25 No.6
Kashmir basin situated in tectonically active area NW Himalaya is surrounded by a number of seismogenic faults. In the present study, the structures are identified using the edge enhancement filters, false colour composite and DEM derived products like shaded relief, aspect, slope, drainage network, and 3D profiling. Linear structural feature map was analysed using density, orientation, length, and subsequently correlated with geological map. The area shows highest density in NW–SE, E–W and N–S orientation, with predominance of first direction structures with trend resemblance to tectonic structures present in and around. The western flank shows high density of tectonic lineaments, the Gulmarg and Tosamaidan lineament are supported by geomorphic evidences and shows linear trend with the tectonic structures including Balapur fault (out-of-sequence fault) mapped in Pleistocene deposits and earthquake epicentres present in and around the area. These results correspond to the overall NW–SE direction of the structures resulting from the NE– SW compressional effect of the regional tectonic structures. The approach applied for extraction of structural features of tectonic origin will prove to be very crucial for further investigation in future for fault delineation, seismic and landslide hazard assessment, and mitigation measures in the region.
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Arshad Ali,Farman Ullah,Irum Sabir Ali,Ahmad Faraz,Mumtaz Khan,Syed Tahir Ali Shah,Nawab Ali,Muhammad Saeed 한국유방암학회 2016 Journal of breast cancer Vol.19 No.2
Purpose: The promoter methylation status of cell cycle regulatory genes plays a crucial role in the regulation of the eukaryotic cell cycle. CpG cytosines are actively subjected to methylation during tumorigenesis, resulting in gain/loss of function. E2F5 gene has growth repressive activities; various studies suggest its involvement in tumorigenesis. This study aims to investigate the epigenetic regulation of E2F5 in breast cancer to better understand tumor biology. Methods: The promoter methylation status of 50 breast tumor tissues and adjacent normal control tissues was analyzed. mRNA expression was determined using SYBR® green quantitative polymerase chain reaction (PCR), and methylation- specific PCR was performed for bisulfite-modified genomic DNA using E2F5-specific primers to assess promoter methylation. Data was statistically analyzed. Results: Significant (p<0.001) upregulation was observed in E2F5 expression among tumor tissues, relative to the control group. These samples were hypo-methylated at the E2F5 promoter region in the tumor tissues, compared to the control. Change in the methylation status (Δmeth) was significantly lower (p=0.022) in the tumor samples, indicating possible involvement in tumorigenesis. Patients at the postmenopausal stage showed higher methylation (75%) than those at the premenopausal stage (23.1%). Interestingly, methylation levels gradually increased from the early to the advanced stages of the disease (p<0.001), which suggests a putative role of E2F5 methylation in disease progression that can significantly modulate tumor biology at more advanced stage and at postmenopausal age (Pearson’s r=0.99 and 0.86, respectively). Among tissues with different histological status, methylation frequency was higher in invasive lobular carcinoma (80.0%), followed by invasive ductal carcinoma (46.7%) and ductal carcinoma in situ (20.0%). Conclusion: Methylation is an important epigenetic factor that might be involved in the upregulation of E2F5 gene in tumor tissues, which can be used as a prognostic marker for breast cancer.
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Ali Shahid,Jiang Junfeng,Hassan Syed Tauseef,Shah Ashfaq Ahmad 한국원자력학회 2022 Nuclear Engineering and Technology Vol.54 No.10
The expansion of a country's ecological footprint generates resources for economic development. China's import bill and carbon footprint can be reduced by investing in green transportation and energy technologies. A sustainable environment depends on the cessation of climate change; the current study investigates nuclear energy efficiency, economic complexity, air transportation, and industrial improvement for reducing environmental footprint. Using data spanning the years 1983e2016, the dynamic autoregressive distributed lag simulation method has demonstrated the short- and long-term variability in the impact of regressors on the ecological footprint. The study findings revealed that economic complexity in China had been found to have a statistically significant impact on the country's ecological footprint. Moreover, the industrial improvement process is helpful for the ecological footprint in China. In the short term, air travel has a negative impact on the ecological footprint, but this effect diminishes over time. Additionally, energy innovation is negative and substantial both in the short and long run, thus demonstrating its positive role in reducing the ecological footprint. Policy implications can be extracted from a wide range of issues, including economic complexity, industrial improvement, air transportation, energy innovation, and ecological impact to achieve sustainable goals.
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Mobile Botnet Attacks - an Emerging Threat: Classification, Review and Open Issues
( Ahmad Karim ),( Syed Adeel Ali Shah ),( Rosli Bin Salleh ),( Muhammad Arif ),( Rafidah Md Noor ),( Shahaboddin Shamshirband ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.4
The rapid development of smartphone technologies have resulted in the evolution of mobile botnets. The implications of botnets have inspired attention from the academia and the industry alike, which includes vendors, investors, hackers, and researcher community. Above all, the capability of botnets is uncovered through a wide range of malicious activities, such as distributed denial of service (DDoS), theft of business information, remote access, online or click fraud, phishing, malware distribution, spam emails, and building mobile devices for the illegitimate exchange of information and materials. In this study, we investigate mobile botnet attacks by exploring attack vectors and subsequently present a well-defined thematic taxonomy. By identifying the significant parameters from the taxonomy, we compared the effects of existing mobile botnets on commercial platforms as well as open source mobile operating system platforms. The parameters for review include mobile botnet architecture, platform, target audience, vulnerabilities or loopholes, operational impact, and detection approaches. In relation to our findings, research challenges are then presented in this domain.
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Channel Clustering and QoS Level Identification Scheme for Multi-Channel Cognitive Radio Networks
Ali, Amjad,Yaqoob, Ibrar,Ahmed, Ejaz,Imran, Muhammad,Kwak, Kyung Sup,Ahmad, Adnan,Hussain, Syed Asad,Ali, Zulfiqar IEEE 2018 IEEE communications magazine Vol.56 No.4
<P>The increasing popularity of wireless services and devices necessitates high bandwidth requirements; however, spectrum resources are not only limited but also heavily underutilized. Multiple license channels that support the same levels of QoS are desirable to resolve the problems posed by the scarcity and inefficient use of spectrum resources in multi-channel cognitive radio networks (MCRNs). One reason is that multimedia services and applications have distinct, stringent QoS requirements. However, due to a lack of coordination between primary and secondary users, identifying the QoS levels supported over available licensed channels has proven to be problematic and has yet to be attempted. This article presents a novel Bayesian non-parametric channel clustering scheme, which identifies the QoS levels supported over available license channels. The proposed scheme employs the infinite Gaussian mixture model and collapsed Gibbs sampler to identify the QoS levels from the feature space of the bit rate, packet delivery ratio, and packet delay variation of licensed channels. Moreover, the real measurements of wireless data traces and comparisons with baseline clustering schemes are used to evaluate the performance of the proposed scheme.</P>
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Raza, Syed Abbas,Karim, Muhammad Ramzan Abdul,Shehbaz, Tauheed,Taimoor, Aqeel Ahmad,Ali, Rashid,Khan, Muhammad Imran The Korean Electrochemical Society 2022 Journal of electrochemical science and technology Vol.13 No.2
In the present study, the corrosion behavior of aluminum Al-7075 tempered (T-6 condition) alloy was evaluated by immersion testing and electrochemical testing in 1.75% and 3.5% NaCl environment at acidic, neutral and basic pH. The data obtained by both immersion tests and electrochemical corrosion tests (potentiodynamic polarization and electrochemical impedance spectroscopy tests) present that the corrosion rate of the alloy specimens is minimum for the pH=7 condition of the solution due to the formation of dense and well adherent thin protective oxide layer. Whereas the solutions with acidic and alkaline pH cause shift in the corrosion behavior of aluminum alloy to more active domains aggravated by the constant flux of acidic and alkaline ions (Cl<sup>-</sup> and OH<sup>-</sup>) in the media which anodically dissolve the Al matrix in comparison to precipitated intermetallic phases (cathodic in nature) formed due to T6 treatment. Consequently, the pitting behavior of the alloy, as observed by cyclic polarization tests, shifts to more active regions when pH of the solutions changes from neutral to alkaline environment due to localized dissolution of the matrix in alkaline environment that ingress by diffusion through the pores in the oxide film. Microscopic analysis also strengthens the results obtained by immersion corrosion testing and electrochemical corrosion testing as the study examines the corrosion behavior of this alloy under a systematic evaluation in marine environment.
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Shah, Syed Mazhar Hussain,Ali, Shujait,Zubair, Muhammad,Jamil, Huma,Ahmad, Nazir Korean Society of Animal Sciences and Technology 2016 한국축산학회지 Vol.58 No.7
Background: The current study was designed to investigate the effect of supplementation of Flaxseed (Linumusitatisimum) oil on libido and semen quality of Nilli-Ravi buffalo bulls. Methods: In this study, 12 adult healthy bulls kept at the Semen Production Unit, Qadirabad district Sahiwal, were used. These bulls were divided into three equal groups, A, B and C. Group A was kept as control, while in groups B and C supplementation of feed was provided by using flaxseed oil @125 ml/day and 250 ml/day,respectively for 12 weeks. Two ejaculates per animal were collected at 0 day then 5th, 6th, 7th, 8th, 9th, 10th, 11th and 12th week of treatment. In this way a total 216 samples were taken, and each semen sample was evaluated for color, volume, mass activity, percent motility, sperm cell concentration per ml, percentage of live sperm, and plasma membrane integrity. Libido of bulls was also evaluated before every collection. Results: Analysis of data revealed that these parameters were significantly (P < 0.01) increased in flax oil treated animals as compared to control. Conclusion: It was concluded from the present study that flax seed oil has beneficial effects on reproductive health of buffalo bull.
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Effect of once-a-day milk feeding on behavior and growth performance of pre-weaning calves
Mushtaq Syed Husnain,Hussain Danish,Hifz-ul-Rahman,Naveed-ul-Haque Muhammad,Ahmad Nisar,Sardar Ahmad Azeem,Chishti Ghazanfar Ali 아세아·태평양축산학회 2024 Animal Bioscience Vol.37 No.2
Objective: The objectives of the present study were to evaluate the effects of once-a-day milk feeding on growth performance and routine behavior of preweaning dairy calves. Methods: At 22nd day of age, twenty-four Holstein calves were randomly assigned to one of two treatment groups (n = 12/treatment) based on milk feeding frequency (MF): i) 3 L of milk feeding two times a day; ii) 6 L of milk feeding once a day. The milk feeding amount was reduced to half for all calves between 56 and 60 days of age and weaning was done at 60 days of age. To determine the increase in weight and structural measurements, each calf was weighed and measured at 3 weeks of age and then at weaning. The daily behavioral activity of each calf was assessed from the 22nd day of age till weaning (60th day of age) through Nederlandsche Apparatenfabriek (NEDAP) software providing real-time data through a logger fitted on the calf’s foot. Results: There was no interaction (p≥0.17) between MF and sex of the calves for routine behavioral parameters, body weight and structural measurements. Similarly, there was no effect of MF on routine behavioral parameters, body weight and structural measurements. However, the sex of the calves affected body weight gain in calves. Male calves had 27% greater total body weight and average daily gain than female calves. There was no effect of the sex of the calves on behavioral measurements. Collectively, in the current study, no negative effects of a once-a-day milk feeding regimen were found on routine behavioral and growth parameters of preweaning calves in group housing. Conclusion: Once-a-day milk feeding can be safely adopted in preweaning calves from 22nd day of age.
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Abbas, Syed Mustansar,Ahmad, Nisar,Ata-ur-Rehman, Nisar,Rana, Usman Ali,Khan, Salah Ud-Din,Hussain, Shabbir,Nam, Kyung-Wan Elsevier 2016 ELECTROCHIMICA ACTA Vol.212 No.-
<P><B>Abstract</B></P> <P>The present study describes the synthesis of nanocomposite materials based on chromium oxide (Cr<SUB>2</SUB>O<SUB>3</SUB>) nanoparticles and carbon nanotubes (CNTs) (Cr<SUB>2</SUB>O<SUB>3</SUB>–CNT<SUB>(x%)</SUB>) by <I>in-situ</I> chemical co-precipitation method. The physical studies of these materials using a wide range of analytical techniques reveal high surface area and narrow pore size distribution of these nanocomposite materials, indicating homogenous dispersion of Cr<SUB>2</SUB>O<SUB>3</SUB> nanoparticles (particle sizes ∼20-30nm) on the surface of CNTs. The first cycle discharge capacity of 1120 <SUP> mAhg -1 </SUP> for electrodes fabricated from Cr<SUB>2</SUB>O<SUB>3</SUB> alone, which is improved for Cr<SUB>2</SUB>O<SUB>3</SUB>–CNT<SUB>(0.08%)</SUB> nanocomposite (1199 <SUP> mAhg -1 </SUP> ). This nanocomposite material achieved an overall reversible capacity of 995.3 <SUP> mAhg -1 </SUP> after 200 cycles, which can be attributed to the high surface area and the large mesoporous volume of Cr<SUB>2</SUB>O<SUB>3</SUB> nanoparticles interconnected with highly conducting network of CNTs. At higher current densities, the Cr<SUB>2</SUB>O<SUB>3</SUB>–CNT<SUB>(x%)</SUB> nanocomposite electrodes exhibited high lithium storage capacity compared to the electrode fabricated from Cr<SUB>2</SUB>O<SUB>3</SUB> nanoparticles alone. Overall, the Cr<SUB>2</SUB>O<SUB>3</SUB>–CNT<SUB>(0.08%)</SUB> nanocomposite electrode displayed high stability under varying current rates with overall high capacity retention and highest reversible capacity of 719 <SUP> mAhg -1 </SUP> at a current rate of 2000 <SUP> mAhg -1 </SUP> . This highly enhanced rate capability and excellent cycling stability of Cr<SUB>2</SUB>O<SUB>3</SUB>–CNT<SUB>(0.08%)</SUB> nanocomposite electrode can be ascribed to the synergistic effect of CNTs (anchored with the Cr<SUB>2</SUB>O<SUB>3</SUB> nanoparticles). The outcome of this study offers a possibility of improving lithium ion storage of Cr<SUB>2</SUB>O<SUB>3</SUB> nanoparticles by carefully controlling their size and shape along with the use of a suitable buffering matrix like CNTs.</P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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