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用堆浸-液体-凝胶萃取联合流程从含铀磷酸盐砂岩中回收铀的研究——Ⅱ液体-凝胶萃取

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湿法冶金 1993年第4期12卷 44-50页

作者： k.shakir 李雁南

研究了用液体-凝胶萃取法从当地的磷酸盐砂岩堆浸得到的浸出液中萃取铀。使用的凝胶是苯乙烯二乙烯苯和二-(2-乙基己基)磷酸的共聚物。研究了可能影响过程的各种不同因素。发现在凝胶中加入TBP能提高铀的萃取率,凝胶上萃取的铀可以用Fe(... 详细信息

研究了用液体-凝胶萃取法从当地的磷酸盐砂岩堆浸得到的浸出液中萃取铀。使用的凝胶是苯乙烯二乙烯苯和二-(2-乙基己基)磷酸的共聚物。研究了可能影响过程的各种不同因素。发现在凝胶中加入TBP能提高铀的萃取率,凝胶上萃取的铀可以用Fe(Ⅱ)/H_3PO_4溶液有效地反萃取。联合堆浸和液体-凝胶萃取的实验室试验,证实了在试验条件下,采用联合流程从矿石中回收铀的可行性。

关键词：磷酸盐砂岩凝胶萃取铀

基于多层ReLU网络的楼宇暖通空调系统能量管理策略

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电力系统自动化 2024年第15期48卷 84-91页

作者：王枭刘清 Alaa shakir 张靖邦王驰武汉理工大学自动化学院湖北省武汉市430070 武汉大学电气与自动化学院湖北省武汉市430072 国网辽宁省电力有限公司辽宁省沈阳市110004

提升现代智能楼宇的能量管理能力,是电力紧平衡背景下促进电网节能增效的重要举措。文中提出一种数据驱动的楼宇暖通空调系统节能控制策略,避免了传统模型预测控制对精确热力学建模的依赖。首先,在搭建楼宇热网络仿真模型的基础上,采用... 详细信息

提升现代智能楼宇的能量管理能力,是电力紧平衡背景下促进电网节能增效的重要举措。文中提出一种数据驱动的楼宇暖通空调系统节能控制策略,避免了传统模型预测控制对精确热力学建模的依赖。首先,在搭建楼宇热网络仿真模型的基础上,采用延时嵌入法构造输入特征,建立基于修正线性单元的多层神经网络模型,实现室内温度时间序列的多步预测。然后,针对电网的分时电价,构建滚动时域优化模型,并将其重构为混合整数线性规划的形式,实现有限控制周期内优化模型的高效求解。最后,基于Simscape搭建楼宇热仿真模型,验证了所提控制策略的有效性。仿真结果表明,所提策略能够满足温度舒适度要求,并提高楼宇的经济运行水平。

关键词：智能楼宇暖通空调能量管理模型预测控制修正线性单元数据驱动控制

Traffic Control Based on Integrated kalman Filtering and Adaptive Quantized Q-Learning Framework for Internet of Vehicles

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Computer Modeling in Engineering & Sciences 2024年第3期138卷 2103-2127页

作者： Othman S.Al-Heety Zahriladha Zakaria Ahmed Abu-khadrah Mahamod Ismail Sarmad Nozad Mahmood Mohammed Mudhafar shakir Hussein Alsariera Faculty of Electronic and Computer Engineering Universiti Teknikal Malaysia Melaka(UTeM)Durian TunggalMalaysia College of Computing&Informatics Saudi Electronic UniversityRiyadhSaudi Arabia Department of Electrical Electronic and System EngineeringUniversiti Kebangsaan MalaysiaUKM BangiSelangorMalaysia Computer Technology Engineering College of Engineering TechnologyAl-Kitab UniversityKirkukIraq Faculty of Engineering and Electronic Engineering Universiti Tun Hussein Onn Malaysia(UTHM)Batu PahatMalaysia 6Research Center DepartmentThe University of MashreqBaghdadIraq

Intelligent traffic control requires accurate estimation of the road states and incorporation of adaptive or dynamically adjusted intelligent algorithms for making the *** this article,these issues are handled by proposing a novel framework for traffic control using vehicular communications and Internet of Things *** framework integrates kalman filtering and *** smoothing kalman filtering,our data fusion kalman filter incorporates a process-aware model which makes it superior in terms of the prediction *** traditional Q-learning,our Q-learning algorithm enables adaptive state quantization by changing the threshold of separating low traffic from high traffic on the road according to the maximum number of vehicles in the junction *** evaluation,the model has been simulated on a single intersection consisting of four roads:east,west,north,and south.A comparison of the developed adaptive quantized Q-learning(AQQL)framework with state-of-the-art and greedy approaches shows the superiority of AQQL with an improvement percentage in terms of the released number of vehicles of AQQL is 5%over the greedy approach and 340%over the state-of-the-art ***,AQQL provides an effective traffic control that can be applied in today’s intelligent traffic system.

关键词： Q-learning intelligent transportation system(ITS) traffic control vehicular communication kalman filtering smart city Internet of Things

Nanosecond pulse， dual-wavelength Q-switched 1.5 μm fiber laser using MAX phase CrTiAlCsaturable absorber

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Optoelectronics Letters 2024年

作者： AHMED shakir AL-HITI HIBA HASSAN Department of Electrical Engineering， Faculty of Engineering， University of Anbar Department of Laser and Optoelectronics Engineering， University of Technology-Iraq

We demonstrated a new type of MAX phase material， Chromium Titanium Aluminum Carbide (Cr2TiAlC2) polymer film to generate a passively Q-switched erbium-doped fiber laser. The film thickness was measured around 45 μm which was fabricated using the embedding method with PVA polymer as hoster. The SA film demonstrates a dual-wavelength passively Q-switched erbium-doped fiber laser （EDFL） which operates at 1531 nm and 1560.19 nm， respectively. The Q-switching pulse duration could be varied from 2.46 μs to 770 ns while the repetition rate varied from 92.76 kHz to 106.6 kHz with an increasing input pumping range of 154 mW to 300 mW. The maximum output power and pulse energy of 15.05 mW and 141.18 nJ were obtained at a maximum input power of 300 mW， respectively. To the best of our knowledge， this is the first time that on dual-wavelength Q-switched EDF laser by Cr2TiAlC2as SA.

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Flow Regimes in Bubble Columns with and without Internals: A Review

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Fluid Dynamics & Materials Processing 2024年第2期20卷 239-256页

作者： Ayat N.Mahmood Amer A.Abdulrahman Laith S.Sabri Abbas J.Sultan Hasan shakir Majdi Muthanna H.Al-Dahhan Department of Chemical Engineering University of Technology-IraqBaghdadIraq Chemical and Petroleum Industries Engineering Department Al-Mustaqbal University CollegeBabylonIraq Department of Chemical and Biochemical Engineering Missouri University of Science and TechnologyRollaUSA

Hydrodynamics characterization in terms ofﬂow regime behavior is a crucial task to enhance the design of bubble column reactors and scaling up related *** review presents recent studies on the typicalﬂow regimes established in bubble *** effort is also provided to introduce relevant deﬁnitions pertaining to thisﬁeld,namely,that of“void fraction”and related(local,chordal,cross-sectional and volumetric)*** studies involving different parameters that affect design and operating conditions are also discussed in *** the second part of the review,the attention is shifted to cases with internals of various types(perfo-rated plates,bafﬂes,vibrating helical springs,mixers,and heat exchanger tubes)immersed in the bubble *** is shown that the presence of these elements has a limited inﬂuence on the global column ***,they can make the homogeneousﬂow regime more stable in terms of transition gas velocity and transi-tion holdup *** last section is used to highlight gaps which have not beenﬁlled yet and future directions of investigation.

关键词： Hydrodynamics ﬂow regime bubble column heat-exchanging internals

Role of artificial intelligence in colorectal cancer

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Artificial Intelligence in Gastrointestinal Endoscopy 2024年第2期5卷 31-40页

作者： Gita Lingam Taner shakir Rawen kader Manish Chand Department of General Surgery Princess Alexandra HospitalHarlow CM201QXUnited Kingdom Department of Colorectal Surgery University College LondonLondon W1W 7TYUnited Kingdom Department of Gastroenterology University College LondonUniversity College London Hospitals Nhs Foundation TrustLondon W1BUnited Kingdom Gastroenterological Intervention Centre University College LondonLondon W1W 7TSUnited Kingdom

The sphere of artificial intelligence(AI)is ever *** for clinical practice have been emerging over recent *** its uptake has been most prominent in endoscopy,this represents only one aspect of holistic patient *** are a multitude of other potential avenues in which gastrointestinal care may be *** aim to review the role of AI in colorectal cancer as a *** performed broad scoping and focused searches of the applications of AI in the field of colorectal *** trials including qualitative research were included from the year 2000 *** were grouped into pre-operative,intra-operative and post-operative ***,the major use is with endoscopic *** has embraced the use for human derived classifications such as Narrow-band Imaging International Colorectal Endoscopic,Japan Narrow-band Imaging Expert Team,Paris and ***,novel detection and diagnostic methods have arisen from advances in AI ***-operatively,adjuncts such as image enhanced identification of structures and assessment of perfusion have led to improvements in clinical ***-operatively,monitoring and surveillance have taken strides with potential socioeconomic and environmental *** uses of AI within the umbrella of colorectal surgery are *** have identified existing technologies which are already augmenting cancer *** future applications are exciting and could at least match,if not surpass human standards.

关键词： Artificial intelligence Colorectal cancer Pre-operative Intra-operative Post-operative Adjuncts Colonoscopy

MET receptor tyrosine kinase promotes the generation of functional synapses in adult cortical circuits

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Neural Regeneration Research 2025年第5期20卷 1431-1444页

作者： Yuehua Cui Xiaokuang Ma Jing Wei Chang Chen Neha shakir Hitesch Guirram Zhiyu Dai Trent Anderson Deveroux Ferguson Shenfeng Qiu Basic Medical Sciences University of Arizona College of Medicine-PhoenixPhoenixAZUSA Department of Medicine University of Arizona College of Medicine-PhoenixPhoenixAZUSA

Loss of synapse and functional connectivity in brain circuits is associated with aging and neurodegeneration,however,few molecular mechanisms are known to intrinsically promote synaptogenesis or enhance synapse *** have previously shown that MET receptor tyrosine kinase in the developing cortical circuits promotes dendritic growth and dendritic spine *** investigate whether enhancing MET in adult cortex has synapse regenerating potential,we created a knockin mouse line,in which the human MET gene expression and signaling can be turned on in adult(10–12 months)cortical neurons through doxycycline-containing *** found that similar to the developing brain,turning on MET signaling in the adult cortex activates small GTPases and increases spine density in prefrontal projection *** findings are further corroborated by increased synaptic activity and transient generation of immature silent *** MET signaling resulted in an increasedα-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid/N-methyl-Daspartate(AMPA/NMDA)receptor current ratio,indicative of enhanced synaptic function and *** data reveal that enhancing MET signaling could be an interventional approach to promote synaptogenesis and preserve functional connectivity in the adult *** findings may have implications for regenerative therapy in aging and neurodegeneration conditions.

关键词： aging circuit connectivity cortical circuits molecular mechanisms neural regeneration neurodegeneration synapses

Solving the Generalized Traveling Salesman Problem Using Sequential Constructive Crossover Operator in Genetic Algorithm

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Computer Systems Science & Engineering 2024年第5期48卷 1113-1131页

作者： Zakir Hussain Ahmed Maha Ata Al-Furhood Abdul khader Jilani Saudagar shakir khan Department of Mathematics and Statistics College of ScienceImam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia Department of Computer Science College of Computer and Information SciencesJouf UniversitySakakah42421Saudi Arabia Information Systems Department Imam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia College of Computer and Information Sciences Imam Mohammad Ibn Saud Islamic University(IMSIU)Riyadh11432Saudi Arabia

The generalized travelling salesman problem(GTSP),a generalization of the well-known travelling salesman problem(TSP),is considered for our *** the GTSP is NP-hard and very complex,finding exact solutions is highly expensive,we will develop genetic algorithms(GAs)to obtain heuristic solutions to the *** GAs,as the crossover is a very important process,the crossovermethods proposed for the traditional TSP could be adapted for the *** sequential constructive crossover(SCX)and three other operators are adapted to use in GAs to solve the *** effectiveness of GA using SCX is verified on some GTSP Library(GTSPLIB)instances first and then compared against GAs using the other crossover *** computational results show the success of the GA using SCX for this *** proposed GA using SCX,and swap mutation could find average solutions whose average percentage of excesses fromthe best-known solutions is between 0.00 and 14.07 for our investigated instances.

关键词： Generalized travelling salesman problem NP-hard genetic algorithms sequential constructive crossover swap mutation

Performance Analysis of a Markovian Queue with Impatient Customers and Working Vacation

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Journal of the Operations Research Society of China 2023年第1期11卷 133-156页

作者： shakir Majid Department of Mathematics University of LadakhLeh CampusLeh194101India

In this paper,we consider the impatient customers in M/M/1 queueing model under variant working vacation *** customer’s impatience is due to its arrival during a working vacation period,where the service rate of the customer is lower than a normal busy *** the system is non-empty when the server returns from the working vacation,the server resumes the normal service ***,the server will take successive working vacations till it reaches the maximum number of k working vacations and then the server remains idle until the next ***-form probabilities are obtained by using the identities involving beta functions and degenerate hypergeometric functions,and the performance measures of the system are derived using generating *** stochastic decomposition structures of the mean queue length and mean waiting time are *** effects of the system parameters on some performance measures had been numerically illustrated.

关键词： Markovian queue Variant working vacations Probability generating function