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Metamaterials and plasmonics: from nanoparticles to nanoantenna arrays, metasurfaces, and metamaterials

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Chinese Physics B 2014年第4期23卷 64-75页

作者： francesco Monticone Andrea alù Department of Electrical and Computer Engineering The University of Texas at Austin 1 University Station C0803Austin Texas 78712 USA

The rise of plasmonic metamaterials in recent years has unveiled the possibility of revolutionizing the entire field of optics and photonics, challenging well-established technological limitations and paving the way to innovations at an unprecedented level To capitalize the disruptive potential of this rising field of science and technology, it is important to be able to combine the richness of optical phenomena enabled by nanoplasmonics in order to realize metamaterial components, devices, and systems of increasing complexity. Here, we review a few recent research directions in the field of plasmonic metamaterials, which may foster further advancements in this research area. We will discuss the anomalous scattering features enabled by plasmonic nanoparticles and nanoclusters, and show how they may represent the fundamental building blocks of complex nanophotonic architectures. Building on these concepts, advanced components can be designed and operated, such as optical nanoantennas and nanoantenna arrays, which, in turn, may be at the basis of metasurface devices and complex systems. following this path, from basic phenomena to advanced functionalities, the field of plasmonic metamaterials offers the promise of an important scientific and technological impact, with applications spanning from medical diagnostics to clean energy and information processing.

关键词： plasmonics metamaterials nanoparticles scattering

The use of non-living animals as simulation models for cranial neurosurgical procedures: a literature review

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Chinese Neurosurgical Journal 2020年第4期6卷 230-234页

作者： Zahraa f.al-Sharshahi Samer S.Hoz Mohammed A.alrawi Mohammed A.Sabah Saja A.albanaa Luis Rafael Moscote-Salazar Department of Neurosurgery Neurosurgery teaching HospitalBaghdadIraq College of Medicine University of BaghdadBaghdadIraq RED LATINO Latin American Trauma&Intensive Neuro-Care OrganizationBogotáColombia

Simulation plays a pivotal role in neurosurgical training by allowing trainees to develop the requisite expertise to enhance patient *** models have been used for simulation ***-living animal models offer a range of benefits,including affordability,availability,biological texture,and a comparable similarity to human *** this paper,we review the available literature on the use of non-living animals in neurosurgical simulation *** aim to answer the following questions:(1)what animals have been used so far,(2)what neurosurgical approaches have been simulated,(3)what were the trainee tasks,and(4)what was the experience of the authors with these models.A search of the PubMed Medline database was performed to identify studies that examined the use of non-living animals in cranial neurosurgical simulation between 1990 and *** initial search yielded a total of 70 *** careful screening,we included 22 articles for qualitative *** compared the reports in terms of the(1)animal used,(2)type of surgery,and(3)trainee *** articles were published between 2003 and *** simulations were performed on three types of animals,namely sheep,cow,and *** authors designed specific,task-oriented approaches and concluded that the models used were adequate for replicating the surgical *** on non-living animal heads has recently gained popularity in the field of neurosurgical ***-living animal models are an increasingly attractive option for cranial neurosurgical simulation *** models enable the acquisition and refinement of surgical skills,with the added benefits of accessibility and *** date,16 different microneurosurgical cranial approaches have been replicated on three non-living animal models,including sheep,cows,and *** review summarizes the experience reported with the use of non-living animal models as alternative laboratory tools for cranial neurosurgi

关键词： Neurosurgery Cranial Simulation Non-living Sheep Swine Cow

The PCDD/PCDf Dioxin Releases in the Climate of Environment of Jordan in the Period (2000-2008)

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Journal of Thermal Science 2010年第2期19卷 182-192页

作者： Mohammed Awwad al-Dabbas Mechanical Engineering department Mutah University

Many environment problems of the full using of several categories of processing include mining,heat generators,direct combustion of forest fires,cement production,power plant,transport,medical ***/furan releases from these categories are one of these environment *** lines of reducing the PCDD/PCDf (Polychlorinated dibenzo-para-dioxins/Polychlorinated dibenzofurans) releases from these categories are *** contribution of this paper is present the identification and estimation of the latest figure of dioxin/furan releases in the climate of environment of Jordan in the period 2000-2008 from the following categories (cement,aluminum,ceramic,medical waste,power plant,land fill,ferrous and non-ferrous metals,uncontrolled combustion process (biomass burning,waste burning,accidental fires in house,transport).These finding shows the sign of growth of estimated PCDD/PCDf releases from categories which did not calculated and followed after *** result shows the highest PCDD/PCDf release from landfill fires (62.75 g TEQ/year),medical waste (8.8264 g TEQ/year),and transport (3.0145 g TEQ/year).Jordan seeks by next years,a reduction in total releases of dioxins and furans from sources resulting from human *** challenge will apply to the aggregate of releases to the air nationwide and of releases to the water within the Jordan *** should conduct air monitoring for dioxin in order to track fluctuations in atmospheric deposition levels.

关键词： Jordan transport sector PCB dioxin & furan POP PCDD/PCDf power plant biogas

Resveratrol Modulates Bone Mineral Density and Bone Mineral Content in A Rat Model of Male Hypogonadism

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Chinese Journal of Integrative Medicine 2023年第2期29卷 146-154页

作者： Hussein f.Sakr Boudaka Ammar Amira alKharusi I al-Lawati Mahmoud alKhateeb Basim H Elesawy Department of Physiology College of Medicine and Health SciencesSultan Qaboos UniversityMuscat 123Oman Medical Physiology Department Faculty of MedicineMansouraUniversityMansoura 35516Egypt Basic Medical Sciences Department College of Medicine at King Saud bin Abdulaziz University for Health Sciences(KSAU-HS)Riyadh 11481Saudi Arabia Department of Clinical Laboratory Sciences College of Applied Medical SciencesTaif UniversityTaif 21944Saudi Arabia

Objective: To determine whether resveratrol(Res) can correct osteoporosis induced in a rat model of male hypogonadism. Methods: Thirty-two rats were randomly divided into 4 groups, 8 in each group;1) a control sham group: underwent a similar surgical procedure for induction of orchiectomy(ORCD) without ligation of any arteries or veins or removal of the testis and epididymis;2) a control + Res-treated group(Con+Res):underwent sham surgery similar to the control, but was then treated with Res, as described below;3) an ORCDinduced group: bilateral ORCD surgery as described above, and 4) a ORCD+Res-treated group: bilateral ORCD surgery followed by Res treatment. Res treatment began 4 weeks after ORCD and continued for 12 weeks. After 12 weeks, bone mineral density(BMD) and bone mineral content(BMC) were measured in the tibia and femur of each rat’s right hind leg. Blood levels of bone turnover indicators such as deoxypyridinoline(Dpd), N-telopeptide of type Ⅰ collagen(NTXⅠ), alkaline phosphatase(alP), and osteocalcin(OC), as well as receptor activator of nuclear factor kappa B(RANK) and osteoprotegerin(OPG) were assessed. Results: ORCD significantly decreased BMD(Pficantly increased bone resorption, manifested by increased RANK. In addition, it inhibited serum levels of OPG and OC. Res treatment after ORCD effectively increased serum levels of bone formation markers such as OPG and OC, compared with testisectomized rats(Pale hypogonadism, possible via restoration of the normal balance between RANK and OPG.

关键词： osteoporosis male hypogonadism resveratrol receptor activator of nuclear factor-kappa

In flue nee of microwave drying and con venti onal drying methods on the mechanical properties of naproxen sodium drug tablets

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Particuology 2020年第6期18卷 30-40页

作者： Maha al-ali Rajarathinam Parthasarathy Chemical and Environmental Engineering School of EngineeringRM1T UniversityMelbourneVictoria 3001Australia

Tablets are one of the most comm only used solid dosage forms taken by *** preparati on of high-quality tablets requires an understanding of the preparation process and elucidation of how the physical and mechanical properties change as a function of the preparation *** work aims to investigate the impact of microwave irradiation drying and conventional drying methods(including freeze,convective and vacuum drying)on the hardness,tensile strength and friability of tablets made from a multi-component formulation containing naproxen sodium,microcrystalline cellulose,and *** results show that tablets subjected to microwave drying had the secondhighest tensile strength and hardness of 1.296 MPa and 67 N,*** tablets subjected to vacuum drying had the lowest tensile strength and hardness of 1.21 MPa and 64 N,*** friability index values for the tablets derived from the microwave and freeze-drying methods werefor the tablets subjected to convective drying and vacuum drying methods were>l%.Microwave drying was observed to be an efficient method to produce naproxen sodium-containing tablets with satisfactory mechanical *** findings confirm that the drying method plays an essential role in the improvement or degradation of the mechanical properties of tablets.

关键词： Microwave drying Naproxen sodium Hardness friability Tensile strength

Deep Learning Based Cyber Event Detection from Open-Source Re-Emerging Social Data

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Computers, Materials & Continua 2023年第8期76卷 1423-1438页

作者： farah Mohammad Saad al-Ahmadi Jalal al-Muhtadi Center of Excellence in Information Assurance(CoEIA) King Saud UniversityRiyadh11543Saudi Arabia College of Computer&Information Sciences King Saud UniversityRiyadh11543Saudi Arabia

Social media forums have emerged as the most popular form of communication in the modern technology era,allowing people to discuss and express their *** increases the amount of material being shared on social media *** is a wealth of information about the threat that may be found in such open data *** security of.already-deployed software and systems relies heavily on the timely detection of newly-emerging threats to their safety that can be gleaned from such *** the fact that several models for detecting cybersecurity events have been presented,it remains challenging to extract security events from the vast amounts of unstructured text present in public data *** majority of the currently available methods concentrate on detecting events that have a high number of *** is because the unstructured text in open data sources typically contains a large number of ***,to react to attacks quicker than they can be launched,security analysts and information technology operators need to be aware of critical security events as soon as possible,regardless of how often they are *** research provides a unique event detection method that can swiftly identify significant security events from open forums such as *** proposed work identified new threats and the revival of an attack or related event,independent of the volume of mentions relating to those events on *** this research work,deep learning has been used to extract predictive features from open-source *** proposed model is composed of data collection,data transformation,feature extraction using deep learning,Latent Dirichlet allocation(LDA)based medium-level cyber-event detection and final Google Trends-based high-level cyber-event *** proposed technique has been evaluated on numerous *** results show that the proposed method outperforms existing methods in detecting cyber events by giving 95.96

关键词： Social media twitter cyber events deep learning

Novel Positive Multi-Layer Graph Based Method for Collaborative filtering Recommender Systems

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Journal of Computer Science & Technology 2022年第4期37卷 975-990页

作者： Bushra alhijawi Ghazi al-Naymat Department of Computer Science Princess Sumaya University for TechnologyAmman 11941Jordan Artificial Intelligence Research Center College of Engineering and Information TechnologyAjman UniversityAjman 20550U.A.E.

Recommender systems play an increasingly important role in a wide variety of applications to help users find favorite products. Collaborative filtering has remarkable success in terms of accuracy and becomes one of the most popular recommendation methods. However, these methods have shown unpretentious performance in terms of novelty, diversity, and coverage. We propose a novel graph-based collaborative filtering method, namely Positive Multi-Layer Graph-Based Recommender System (PMLG-RS). PMLG-RS involves a positive multi-layer graph and a path search algorithm to generate recommendations. The positive multi-layer graph consists of two connected layers: the user and item layers. PMLG-RS requires developing a new path search method that finds the shortest path with the highest cost from a source node to every other node. A set of experiments are conducted to compare the PMLG-RS with well-known recommendation methods based on three benchmark datasets, MovieLens-100K, MovieLens-Last, and film Trust. The results demonstrate the superiority of PMLG-RS and its high capability in making relevant, novel, and diverse recommendations for users.

关键词： recommender system collaborative filtering graph theory path search novelty coverage diversity

Single image super-resolution:a comprehensive review and recent insight

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frontiers of Computer Science 2024年第1期18卷 139-156页

作者： Hanadi al-MEKHLAfI Shiguang LIU College of Intelligence and Computing Tianjin UniversityTianjin 300350China

Super-resolution(SR)is a long-standing problem in image processing and computer vision and has attracted great attention from researchers over the *** main concept of SR is to reconstruct images from low-resolution(LR)to high-resolution(HR).It is an ongoing process in image technology,through up-sampling,de-blurring,and *** neural network(CNN)has been widely used to enhance the resolution of images in recent *** alternative methods use deep learning to improve the progress of image super-resolution based on ***,we review the recent findings of single image super-resolution using deep learning with an emphasis on distillation knowledge used to enhance image super-resolution.,it is also to highlight the potential applications of image super-resolution in security monitoring,medical diagnosis,microscopy image processing,satellite remote sensing,communication transmission,the digital multimedia industry and video ***,we present the challenges and assess future trends in super-resolution based on deep learning.

关键词： super-resolution deep learning single-image interpolation-based learning-based reconstruction-based

A Hierarchical Trust Model for Peer-to-Peer Networks

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Computers, Materials & Continua 2019年第5期59卷 397-404页

作者： Nehal al-Otaiby Heba Kurdi Shiroq al-Megren College of Computer and Information Science King Saud UniversityRiyadh 11642Saudi Arabia

Trust has become an increasingly important issue given society’s growing reliance on electronic ***-to-peer(P2P)networks are among the main electronic transaction environments affected by trust issues due to the freedom and anonymity of peers(users)and the inherent openness of these networks.A malicious peer can easily join a P2P network and abuse its peers and resources,resulting in a large-scale failure that might shut down the entire ***,a plethora of researchers have proposed trust management systems to mitigate the impact of the ***,due to the problem’s scale and complexity,more research is *** algorithm proposed here,HierarchTrust,attempts to create a more reliable environment in which the selection of a peer provider of a file or other resource is based on several trust values represented in hierarchical *** values at the top of the hierarchical form are more trusted than those at the lower end of the ***,in HierarchTrust,is generally calculated based on the standard *** via simulation showed that HierarchTrust produced a better success rate than the well-established EigenTrust algorithm.

关键词： Peer-to-peer network trust management reputation malicious peers