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MHD Effect on an Oscillatory Mixed Convective Flow Past an Infinite Vertical Porous Plate with Radiation

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Open Journal of Fluid Dynamics 2013年第4期3卷 271-277页

作者： Nazibuddin Ahmed sujan Sinha Department of Mathematics Gauhati University Guwahati India

A parametric study to investigate the effects of magnetic field and radiation on a mixed convective flow past an infinite vertical porous plate with constant suction velocity when the free stream varies periodically with time about a steady mean is presented. A uniform magnetic field is applied normal to the plate. The Rosseland approximation is used to describe the radiative heat flux in the energy equation and the resultant set of non-dimensional equations are solved analytically by adopting regular perturbation technique. The profiles of velocity, temperature, skin-friction and nusselt number are demonstrated graphically for various values of the parameters involved in the problem and the results are physically interpreted.

关键词： Mixed Convection Porous Medium Radiation

System Identification Modeling and Unstable Behavior of the Dynamics of Flows within the Tip Region of an Axial Compressor Blade Passage

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Journal of Thermal Science 2016年第2期25卷 109-116页

作者： STERBENTZ Dane M. PRASAI sujan HOFLE Mary M. WALTERS Thomas LIN Feng LI Ji-chao BOSWORTH Ken SCHOEN Marco P. Idaho State University Measurement and Control Engineering Research Center Institute of Engineering Thermophysics Chinese Academy of Sciences

In recent years, the correlation coefficient of pressure data from the same blade passage in an axial compressor unit has been used to characterize the state of flow in the blade passage. In addition, the correlation coefficient has been successfully used as an indicator for active control action using air injection. In this work, the correlation coefficient approach is extended to incorporate system identification algorithms in order to extract a mathematical model of the dynamics of the flows within a blade passage. The dynamics analyzed in this research focus on the flow streams and pressure along the rotor blades as well as on the unsteady tip leakage flow from the rotor tip gaps. The system identification results are used to construct a root locus plot for different flow coefficients, starting far away from stall to near stall conditions. As the compressor moves closer to stall, the poles of the identified models move towards the imaginary axis of the complex plane, indicating an impending instability. System frequency data is captured using the proposed correlation based system identification approach. Additionally, an oscillatory tip leakage flow is observed at a flow coefficient away from stall and how this oscillation changes as the compressor approaches stall is an interesting result of this research. Comparative research is analyzed to determine why the oscillatory flow behavior occurs at a specific sensor location within the tip region of the rotor blade.

关键词： axial compressor correlation coefficient oscillatory behavior system identification

对数正态分布衰落下的光OFDM水下可见光通信空间分集系统

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红外与激光工程 2020年第2期49卷 66-72页

作者：蒋红艳仇洪冰何宁吴越 Zahir Ahmad sujan Rajbhandari 桂林电子科技大学信息与通信学院广西桂林541004 广西无线宽带通信与信号处理重点实验室广西桂林541004 考文垂大学计算机电子与数学学院英国考文垂CV12JH

水下可见光通信(UVLC)是实现高速宽带信息传输的有效方案,但由于受到信道中吸收、散射和湍流的不利影响而面临着许多困难。针对水下湍流信道中多径和衰落带来的影响,提出了一种光正交频分复用(O-OFDM)等增益合并的分集方案,根据广义的... 详细信息

水下可见光通信(UVLC)是实现高速宽带信息传输的有效方案,但由于受到信道中吸收、散射和湍流的不利影响而面临着许多困难。针对水下湍流信道中多径和衰落带来的影响,提出了一种光正交频分复用(O-OFDM)等增益合并的分集方案,根据广义的朗伯定律得到信道增益,通过对数正态分布模拟信号衰落。采用蒙特卡洛方法对正交幅度调制(QAM)的非对称削波光正交频分复用(ACOOFDM)和直流偏置光正交频分复用(DCO-OFDM)两种分集系统进行建模仿真,分析高斯信道和弱湍流信道下系统的误比特率,探讨不同分集数目和闪烁系数情况下的分集增益。研究结果验证了分集是降低湍流影响的有效手段,有利于改善水下信息传输性能,为弱湍流信道下正交频分复用可见光通信系统的设计、预测和评估提供参考。

关键词：水下可见光通信衰落对数正态分布空间分集正交频分复用

Integrated Multi-Head Self-Attention Transformer model for electricity demand prediction incorporating local climate variables

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Energy and AI 2023年第4期14卷 620-644页

作者： sujan Ghimire Thong Nguyen-Huy Mohanad S.AL-Musaylh Ravinesh C.Deo David Casillas-Perez Sancho Salcedo-Sanz School of Mathematics Physics and ComputingUniversity of Southern QueenslandSpringfieldQLD4300Australia Centre for Applied Climate Sciences University of Southern QueenslandToowoomba4350QLDAustralia Department of Information Technologies Management Technical CollegeSouthern Technical UniversityBasrah 61001Iraq Department of Signal Processing and Communications Universidad Rey Juan CarlosFuenlabrada28942MadridSpain Department of Signal Processing and Communications Universidad de AlcaláAlcaláde Henares28805MadridSpain

This paper develops a trustworthy deep learning model that considers electricity demand(G)and local climate *** model utilises Multi-Head Self-Attention Transformer(TNET)to capture critical information from𝐻,to attain reliable predictions with local climate(rainfall,radiation,humidity,evaporation,and maximum and minimum temperatures)data from Energex substations in Queensland,*** TNET model is then evaluated with deep learning models(Long-Short Term Memory LSTM,Bidirectional LSTM BILSTM,Gated Recurrent Unit GRU,Convolutional Neural Networks CNN,and Deep Neural Network DNN)based on robust model assessment *** Kernel Density Estimation method is used to generate the prediction interval(PI)of electricity demand forecasts and derive probability metrics and results to show the developed TNET model is accurate for all the *** study concludes that the proposed TNET model is a reliable electricity demand predictive tool that has high accuracy and low predictive errors and could be employed as a stratagem by demand modellers and energy policy-makers who wish to incorporate climatic factors into electricity demand patterns and develop national energy market insights and analysis systems.

关键词： Electricity demand forecasting Sustainable energy Artificial Intelligence Deep learning Transformer Networks Kernel Density Estimation

Biological Stability of Water-Based Cutting Fluids:Progress and Application

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Chinese Journal of Mechanical Engineering 2022年第1期35卷 7-30页

作者： Lizhi Tang Yanbin Zhang Changhe Li Zongming Zhou Xiaolin Nie Yun Chen Huajun Cao Bo Liu Naiqing Zhang Zafar Said sujan Debnath Muhammad Jamil Hafiz Muhammad Ali Shubham Sharma School of Mechanical and Automotive Engineering Qingdao University of TechnologyQingdao 266520China Hanergy(Qingdao)Lubrication Technology Co. Ltd.Qingdao 266200China Nanjing Kerun Lubricants Co. Ltd.Nanjing 211106China Chengdu Tool Research Institute Co. LtdChengdu 610500China School of Mechanical Engineering Chongqing UniversityChongqing 400044China Sichuan Future Aerospace Industry LLC Shifang 618400China Shanghai Jinzhao Energy Saving Technology Co. Ltd.Shanghai 200436China Department of Sustainable and Renewable Energy Engineering University of Sharjah27272 SharjahUnited Arab Emirates Mechanical Engineering Department Curtin University98009 MiriMalaysia College of Mechanical and Electrical Engineering Nanjing University of Aeronautics and AstronauticsNanjing 210016China Mechanical Engineering Department King Fahd University of Petroleum and MineralsDhahran 31261Saudi Arabia Department of Mechanical Engineering IK Gujral Punjab Technical UniversityKapurthala 144603PunjabIndia

The application of cutting fluid in the field of engineering manufacturing has a history of hundreds of years,and it plays a vital role in the processing efficiency and surface quality of *** them,water-based cutting fluid accounts for more than 90%of the consumption of cutting ***,long-term recycling of water-based cutting fluid could easily cause deterioration,and the breeding of bacteria could cause the cutting fluid to fail,increase manufacturing costs,and even endanger the health of *** bactericides could improve the biological stability of cutting fluids,but they are toxic to the environment and do not conform to the development trend of low-carbon ***-carbon manufacturing is inevitable and the direction of sustainable *** use of nanomaterials,transition metal complexes,and physical sterilization methods on the bacterial cell membrane and genetic material could effectively solve this *** this article,the mechanism of action of additives and microbial metabolites was first ***,the denaturation mechanism of traditional bactericides on the target protein and the effect of sterilization efficiency were ***,the mechanism of nanomaterials disrupting cell membrane potential was *** effects of lipophilicity and the atomic number of transition metal complexes on cell membrane penetration were also summarized,and the effects of ultraviolet rays and ozone on the destruction of bacterial genetic material were *** other words,the bactericidal performance,hazard,degradability,and economics of various sterilization methods were comprehensively evaluated,and the potential development direction of improving the biological stability of cutting fluid was proposed.

关键词： Cutting fluid Microorganism Bactericide Sterilization

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三株新分离的假单胞菌降解DEP特性研究

三株新分离的假单胞菌降解DEP特性研究

作者： sujan Khadka 华中师范大学

学位级别：硕士

邻苯二甲酸二乙酯(Di-ethyl phthalate,DEP)是一种增塑剂,是我们日常生活中最常用的邻苯二甲酸酯类化合物之一。DEP造成的环境污染问题已成为严重的全球化问题,它大量存在于日常用品中,如塑料和化妆品等。现有研究发现DEP不仅会导致内... 详细信息

邻苯二甲酸二乙酯(Di-ethyl phthalate,DEP)是一种增塑剂,是我们日常生活中最常用的邻苯二甲酸酯类化合物之一。DEP造成的环境污染问题已成为严重的全球化问题,它大量存在于日常用品中,如塑料和化妆品等。现有研究发现DEP不仅会导致内分泌激素失调,还会对人类及其他动物产生致畸、肝毒和致癌作用,另外,DEP会破坏神经系统以及动物的生殖器官,因此,它被美国环境保护局视为严重污染物之一。DEP有两种环境降解方式:生物降解和非生物降解。在水生和陆地系统中,例如污水、土壤、沉积物、污泥和地表水中,由微生物介导的生物降解过程是降解DEP的主要方式。非生物降解过程,如水解和光解等则相对较慢,因而它并非是降解DEP的主要方式。研究表明,长链DEP比短链DEP更难代谢。微生物可以将DEP代谢成更简单的形式,如DMP、PA,最终根据分子氧的可用性将其转化为草酰乙酸或乙酸盐。最终,这些化合物可以被微生物利用为柠檬酸循环、乙酸发酵、β氧化或其它能量转化途径中的底物。受此启发,生物修复技术已被众多科研工作者广泛应用于高污染地区中邻苯二甲酸酯的去除。本研究也旨在从严重污染的武汉南湖某地分离、鉴定和筛选最有潜力的菌株,此菌株能将DEP作为唯一碳源进行代谢。基于形态学、生化特性、生理学和16S rDNA基因测序,分离并鉴定了三种高效菌株:假单胞菌CCNU-SK1,恶臭假单胞菌CCNU-SK2,反硝化假单胞菌CCNU-SK3。这可能是关于新型假单胞菌菌株CCNU-SK1、恶臭假单胞菌CCNU-SK2和反硝化假单胞菌CCNU-SK3对DEP生物降解的首次研究。我们研究了在不同温度、pH、DEP浓度、NaCl浓度等环境参数下的DEP生物降解。然后发现在28℃、pH=8、DEP浓度为500 mg/L、NaCl浓度为1.5%的条件下,假单胞菌菌株CCNU-SK1降解DEP的效果最好,其半衰期为10.19 h;同样,反硝化假单胞菌CCNU-SK3降解DEP的最佳条件是33℃、pH=7、DEP浓度为500 mg/L,半衰期为12.6 h;恶臭假单胞菌CCNU-SK2降解DEP的最佳条件是33℃、pH=7、DEP浓度为400 mg/L,半衰期为13.86 h。与其它分离菌株相比,半衰期最低的菌株CCNU-SK1对DEP的生物降解效率最高。结果显示,在菌株CCNU-SK2,菌株CCNU-SK3和菌株CCNU-SK1孵育的4天内,超过99.0%的DEP被生物降解。所有假单胞菌菌株在24小时内都可以完全利用50 mg/L的DEP。假单胞菌菌株不仅能够代谢DEP,还能够代谢DEHP、DBP、DMP、PA、BBP,DOP等邻苯二甲酸酯类化合物。假单胞菌菌株的这种多功能性使它们成为邻苯二甲酸酯生物降解的潜在候选菌,可用作邻苯二甲酸酯污染场所中生物修复的理想菌株。

关键词：邻苯二甲酸二乙酯假单胞菌分子鉴定降解动力学

Use of automated irrigation pumps improves quality of bowel preparation for colonoscopy

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World Journal of Gastrointestinal Endoscopy 2016年第6期8卷 295-300页

作者： sujan Ravi Rana Sabbagh Fadi Antaki Department of Internal Medicine University of Alabama at Birmingham Birmingham AL 35233 United States Division of Gastroenterology John D. Dingell Veterans Affairs Medical Center and Wayne State University School of Medicine Detroit MI 48201United States Detroit Medical Center DetroitMI 48201 United States

AIM: To evaluate the effectiveness of automated irrigation pumps(AIPs) in improving the quality of the bowel preparation and the yield of ***: A retrospective observational study was conducted at a single medical center. Outpatient colonoscopies performed during a 4-mo time period when AIPs were not in use, were compared to colonoscopies performed during control period. The main outcomes measured were quality of bowel preparation, procedures aborted due to poor preparation, recommendations to repeat at short interval due to suboptimal bowel preparation and adenoma detection ***: One thousand and thirty-seven colonoscopies were included. A higher proportion of cases did not achieve a satisfactory bowel preparation when AIPs were not used(24.4% vs 10.3%, P < 0.01). The number of procedures aborted due to inadequate preparation was not significantly different, however a repeat procedure at a short interval was recommended in a higher proportion of cases when AIPs were not used(21.3% vs 6.9%, P < 0.01). Good or excellent preparation was 2.91(95%CI: 2.04-4.15) times more likely when AIPs were used. Detection of polyps and adenomas was not significantly ***: AIP use during colonoscopy results in a higher proportion of colonic preparation rated as satisfactory, although polyp detection rate is not significantly affected. Recommendations for repeat colonoscopy at shorter interval significantly decrease with the use of AIPs. This study supports the use of the irrigation pumps in endoscopy units to improve the quality of colonoscopy.

关键词： Automated irrigation pumps Adenoma Quality Polyps Bowel preparation Surveillance interval Colonoscopy

锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗不稳定锁骨远端骨折

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中国修复重建外科杂志 2021年第8期35卷 978-983页

作者：吴双陈家磊张洁 sujan Shakya 邢飞项舟四川大学华西医院骨科成都610041 四川大学华西医院国际医疗中心成都610041

目的探讨锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗NeerⅡ型或Ⅴ型锁骨远端骨折的疗效。方法 2010年1月—2016年6月使用锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗16例NeerⅡ型或Ⅴ型锁骨远端骨折患者。其中男12例,女4例;年龄14~81岁,平均4... 详细信息

目的探讨锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗NeerⅡ型或Ⅴ型锁骨远端骨折的疗效。方法 2010年1月—2016年6月使用锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗16例NeerⅡ型或Ⅴ型锁骨远端骨折患者。其中男12例,女4例;年龄14~81岁,平均45.6岁。致伤原因:摔伤10例,交通事故伤2例,高处坠落伤2例,重物砸伤2例。锁骨骨折Neer分型:Ⅱa型2例,Ⅱb型13例,Ⅴ型1例。损伤严重程度评分(ISS)为6~29分,平均11.2分。受伤至手术时间为1~18 d,平均6.4 d。记录患者手术时间、术中出血量、住院时间、骨折愈合情况和术后并发症;末次随访时采用上肢功能评定表(DASH)评分、肩关节Constant评分和牛津肩关节评分(OSS)评价肩关节功能。结果所有手术均顺利完成,手术时间50~100 min,平均75.6 min;术中出血量30~100 mL,平均52.8 mL;住院时间4~47 d,平均13.7 d。所有患者均获随访,随访时间1.2~7.5年,平均3.5年。锁骨骨折均愈合,愈合时间9.4~13.6周,平均11.9周。无骨折不愈合、骨折移位、内固定失效、切口感染等并发症发生。15例患者于骨折愈合和功能恢复后取出锁骨钩钢板,1例因无明显不适拒绝二次手术取出锁骨钩钢板。末次随访时,DASH评分为0~13分,平均2.2分;肩关节Constant评分为90~100分,平均96.8分;OSS评分为12~14分,平均12.3分。结论锁骨钩钢板联合缝合锚钉重建喙锁韧带治疗NeerⅡ型或Ⅴ型锁骨远端骨折可获得较好临床疗效,术后并发症少,是一种治疗不稳定锁骨远端骨折的良好方法。

关键词：锁骨远端骨折喙锁韧带锁骨钩钢板缝合锚钉

Homicide in southern India—A five-year retrospective study

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Forensic Medicine and Anatomy Research 2013年第2期1卷 18-24页

作者： Sachidananda Mohanty sujan Kumar Mohanty Kiran Kumar Patnaik Department of Forensic Medicine and Toxicology M.K.C.G. Medical College Berhampur India Department of Forensic Medicine Minakhi Medical College Kanchipuram India

Homicide has become a common practice reflecting anger in southern India. The purpose of this study was to identify the potential risk factors and susceptible victims. This retrospective study analyses the data of 590 cases. Our study revealed that the victims were mostly males of 21 - 30 years, married (63.56%), illiterates (44.07%), low socioeconomic status and belong to rural areas. The laborers and farmers were almost equally affected in males and housewives in females. Outdoor incidents were more (61.86%). Majority of victims were innocent (82.20%) with no previous history of cognizable offence. Blood alcohol was found positive in 30.23% of victims. Sharp cutting weapons were mostly used, with hemorrhage and shock being the most common cause of death. Previous enmity and familial disharmony were the two common causes behind such heinous crime. Most victims had injuries over multiple body parts. Some potential risk factors and their preventive measures pointed at the end.

关键词： Autopsy Homicide Familial Disharmony Victim