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Behavior of dry medium and loose sand-foundation system acted upon by impact loads
Adnan F. Ali,Mohammed Y. Fattah,Balqees A. Ahmed 국제구조공학회 2017 Structural Engineering and Mechanics, An Int'l Jou Vol.64 No.6
The experimental study of the behavior of dry medium and loose sandy soil under the action of a single impulsive load is carried out. Different falling masses from different heights were conducted using the falling weight deflectometer (FWD) to provide the single pulse energy. The responses of soils were evaluated at different locations (vertically below the impact plate and horizontally away from it). These responses include; displacements, velocities, and accelerations that are developed due to the impact acting at top and different depth ratios within the soil using the falling weight deflectometer (FWD) and accelerometers (ARH-500A Waterproof, and Low capacity Acceleration Transducer) that are embedded in the soil and then recorded using the multi-recorder TMR-200. The behavior of medium and loose sandy soil was evaluated with different parameters, these are; footing embedment, depth ratios (D/B), diameter of the impact plate (B), and the applied energy. It was found that increasing footing embedment depth results in: amplitude of the force-time history increases by about 10-30%. due to increase in the degree of confinement with the increasing in the embedment, the displacement response of the soil will decrease by about 25-35% for loose sand, 35-40% for medium sand due to increase in the overburden pressure when the embedment depth increased. For surface foundation, the foundation is free to oscillate in vertical, horizontal and rocking modes. But, when embedding a footing, the surrounding soil restricts oscillation due to confinement which leads to increasing the natural frequency, moreover, soil density increases with depth because of compaction, that is, tendency to behave as a solid medium.
Ali, Shawkat,Bae, Jinho,Lee, Chong Hyun,Kobayashi, Nobuhiko P,Shin, Sangho,Ali, Adnan IOP 2018 Nanotechnology Vol.29 No.45
<P>With the view towards future non-volatile random access memories that can be integrated at a large scale, extensive study on resistive switching (RS) devices arranged in a crossbar array is currently underway. Although the crossbar array architecture offers relatively simple and acceptable scalability, the presence of sneak current is recognized as a critical issue that needs to be resolved at device level. In addressing this issue, we demonstrate a new type of RS device fabricated by combining graphene oxide (G–O) and zinc oxide (ZnO) with highly asymmetric current–voltage (I–V) characteristics depending on the polarity of bias voltage. The distinctive highly asymmetric I–V characteristics result from the presence of a hetero-junction interface formed between the G–O and ZnO layers. This hetero-junction manifests resistance in the range of GΩ under both forward and reverse bias voltage when the device is in the OFF state, in contrast, when the device is in the ON state, it exhibits resistance in the range of MΩ or kΩ under forward bias and GΩ under reverse bias. We propose to employ demonstrated RS devices with highly asymmetric I–V characteristics to mitigate adverse effects of the sneak current.</P>
The Iraqi Special Tribunal under International Humanitarian Law
Ali Adnan Alfeel (사) 이준국제법연구원 2009 Journal of East Asia and International Law Vol.2 No.1
The creation of the Iraqi Special Tribunal in December 2003 by Iraqi authorities who were at the time under the legal occupation of the Coalition Provisional Authority marked the emergence of a new form of internationalized domestic tribunals. The Iraqis succeeded in incorporating the full range of modern crimes into their domestic codes alongside some carefully selected domestic offenses, while amending domestic procedural law in some key ways to align the process with established international law related to the provision of full and fair trials. The subsequent investigations and the beginning of trial proceedings generated major debates about the legitimacy of such a domestic forum within the context of human rights norms and the law of occupation. In particular, there was a major strand of thought from outside Iraq that the most legitimate and appropriate forum would have been an international process under the authority of the United Nations. This article examines the arguments made by the Iraqis who demanded a domestic process based on their inquisitorial model, setting them in the broader context of the emerging trends in international criminal law. Through a detailed and unique analysis of the provisions of human rights law and underlying Iraqi procedural law, it criticizes the arguments made by some that assume the illegitimacy of the tribunal under established international norms. The article provides the most detailed explanation of the law of occupation as it emerged following World War II to conclude that the establishment of the Tribunal as an independent court, and its subsequent validation by sovereign Iraqi domestic authorities, was completely valid and proper. The overarching theme of the article is that the imposition of artificial standards and the complete revocation of the preexisting Iraqi judicial structures would have created a process deemed wholly illegitimate by the Iraqi people and judiciary that would have undermined the establishment of the rule of law in Iraq. The author’s personal interactions with thejudges serve to support the conclusion that the Tribunal is capable of serving as the doorway through which the detailed body of international criminal law is introduced to the broader Arabic speaking world.
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>
Institutional Ownership Heterogeneity and Earnings Management Practices
Muhammad Adnan PARWAR,Shahzad HUSSAIN,Abdul WAHEED,Qaisar Ali MALIK,Muddasir MEHBOOBMuhammad Adnan PARWAR,Shahzad HUSSAIN,Abdul WAHEED,Qaisar Ali MALIK,Muddasir MEHBOOB 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.6
The manipulation of the firms’ earnings reported in the financial statements, also known as earnings management, is common among companies. The current study examined the relationship of institutional ownership heterogeneity and earnings management practices through the Arellano-Bond Dynamic Data-Estimation regression approach. The study adopted the Kothari et al. (2005) model for the measurement of earnings management practices. The research classified the institutional investors into different categories such as mutual funds, pension funds, investment companies, foreign companies, and group ownership. The study analyzed the selected variables by tanking a sample of 206 listed companies on Pakistan Stock Exchange (PSX) for 2013 to 2018. Consistent with agency theory, the results reveal that mutual funds and financial firms’ ownership curtail earnings management practices. Our results reveal the negligible effect of group ownership, investment companies’ ownership, and pension funds ownership in curtailing the earnings management practices in Pakistan. As a result, the findings support monitoring the role of hedge funds and international ownership in earnings management, which restricts managers’ opportunistic behavior. Thus, the proclivity of earnings management practices by managers is mitigated by mutual funds and foreign ownership as compared to the other institutional ownership structure in Pakistani firms.