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Engineering 2024年第10期41卷 84-92页

作者： Yang Chen Zhenduo Wu Longlong Fan rajamani Krishna Hongliang Huang Yi Wang Qizhao Xiong Jinping Li Libo Li College of Chemical Engineering and Technology Taiyuan University of TechnologyTaiyuan 030024China City University of Hong Kong(Dongguan) Dongguan 523000China Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China Van’t Hoff Institute for Molecular Sciences University of AmsterdamAmsterdam 1098 XHNetherlands State Key Laboratory of Separation Membranes and Membrane Processes Tiangong UniversityTianjin 300387China Center for Neutron Scattering City University of Hong Kong Shenzhen Research InstituteShenzhen 518057China

The direct one-step separation of polymer-grade C_(2)H_(4) from complex light hydrocarbon mixtures has high industrial significance but is very ***,an ethylene-adsorption-weakening strategy is applied for precise regulation of the pore geometry of four tailor-made metal–organic frameworks(MOFs)with pillar-layered structures,dubbed TYUT-10/11/12/*** on its pore geometry design and functional group regulation,TYUT-12 exhibits exceptional selective adsorption selectivity toward C_(3)H_(8),C_(3)H_(6),C_(2)H_(6),C_(2)H_(2),and CO_(2) over C_(2)H_(4);its C_(2)H_(6)/C_(2)H_(4) adsorption selectivity reaches 4.56,surpassing the record value of 4.4 by Fe_(2)(O_(2))(dobdc)(dobdc^(4-)=2,5-dioxido-1,4-benzenedicarboxylate).The weak p–p stacking binding affinity toward C_(2)H_(4) in TYUT-12 is clearly demonstrated through a combination of neutron powder diffraction measurements and theoretical *** experiments demonstrate that C_(2)H_(4) can be directly obtained from binary,ternary,quaternary,and six-component light hydrocarbon mixtures with over 99.95%purity.

关键词： Metal-organic frameworks Pore regulation Adsorptive separation One-step purification C_(2)H_(4)purification

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Facile synthesis and characterization of acetate intercalated Co-La layered double hydroxide

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Journal of rare Earths 2017年第5期35卷 474-479页

作者： Meenakshi Pokhriyal Sitharaman Uma rajamani Nagarajan Materials Chemistry Group Department of Chemistry University of Delhi

Layered double hydroxide（LDH） comprising of Co^2＋ and La^3＋-ions with acetate counter anion was successfully synthesized by hydrogen peroxide catalyzed hydrolysis reaction and characterized extensively. The observed reflections in the powder X-ray diffraction pattern could be indexed in P3 space group with a=0.316 nm and c=2.97 nm. Lattice fringes of distances corresponding to the peaks observed in X-ray diffraction pattern were observed in high resolution transmission electron microscopic images. UV-visible diffuse reflectance spectroscopy results confirmed the presence of Co（OH）6 along with the presence of charge-transfer band due to the interlayer carboxylate anion. Magnetization measurements at room temperature indicated high spin configuration of Co^2＋-ion in the sample exhibiting paramagnetic behavior. The mixed metal oxide from calcination was used to reconstruct the parent layered structure. Intercalation experiments with other organic anions in Co-La LDH proved be successful.

关键词： layered acetate interlayer hydroxide hydrolysis anion calcination carboxylate reconstruct intercalation

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Triplet Label Based Image retrieval Using Deep Learning in Large Database

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Computer Systems Science & Engineering 2023年第3期44卷 2655-2666页

作者： K.Nithya V.rajamani research Scholar Department of Information and Communication EngineeringAnna UniversityChennai600025India Department of Electronics and Communication Engineering Veltech Multitech Dr.Rangarajan Dr.Sakunthala Engineering CollegeChennai600062India

recent days,Image retrieval has become a tedious process as the image database has grown very *** introduction of Machine Learning(ML)and Deep Learning(DL)made this process more *** these,the pair-wise label similarity is used tofind the matching images from the *** this method lacks of limited propose code and weak execution of misclassified *** order to get-rid of the above problem,a novel triplet based label that incorporates context-spatial similarity measure is proposed.A Point Attention Based Triplet Network(PABTN)is introduced to study propose code that gives maximum discriminative *** improve the performance of ranking,a corre-lating resolutions for the classification,triplet labels based onfindings,a spatial-attention mechanism and region Of Interest(rOI)and small trial information loss containing a new triplet cross-entropy loss are *** the experimental results,it is shown that the proposed technique exhibits better results in terms of mean reciprocal rank(mrr)and mean Average Precision(mAP)in the CIFAr-10 and NUS-WIPE datasets.

关键词： Image retrieval deep learning point attention based triplet network correlating resolutions classification region of interest

Synergistic and Antisynergistic Intracrystalline Diffusional Influences on Mixture Separations in Fixed-Bed Adsorbers

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Precision Chemistry 2023年第2期1卷 83-93页

作者： rajamani Krishna Van’t Hoff Institute for Molecular Sciences University of Amsterdam Science Park9041098

Separations of mixtures in fixed-bed adsorbers are influenced by factors such as(1)selectivity of adsorption,Sads,(2)diffusional time constants,Đi/rc 2,and(3)diffusion selectivity,Đ1/Đ*** synergistic separations,intracrystalline diffusion of guest molecules serves to enhance the selectivities dictated by thermodynamics of mixture *** antisynergistic separations,intracrystalline diffusion serves to reverse the hierarchy of selectivities dictated by adsorption *** both scenarios,the productivities of the desired product in fixed-bed operations are crucially dependent on diffusional time constants,Đi/rc 2;these need to be sufficiently low in order for diffusional influences to be ***,the ratioĐ1/Đ2 should be large enough for manifestation of synergistic or antisynergistic *** synergistic and antisynergistic separations have two common,distinguishing ***,for transient uptake within crystals,the more mobile component attains supraequilibrium loadings during the initial stages of the *** overshoots,signifying uphill diffusion,are engendered by the cross-coefficientsΓij(i≠j)of thermodynamic correction ***,the component molar loadings,plotted in composition space,follow serpentine equilibration *** cross-coefficients are neglected,no overshoots in the loadings of the more mobile component are experienced,and the component loadings follow monotonous equilibration *** important takeaway message is that the modeling of mixture separations in fixed-bed adsorbers requires the use of the Maxwell−Stefan equations describing mixture diffusion employing chemical potential gradients as driving forces.

关键词： kinetic separations transient uptake microporous crystalline adsorbents Maxwell−Stefan equations thermodynamic coupling uphill diffusion transient breakthrough fixed-bed adsorber

Morris-Lecar model of third-order barnacle muscle fiber is made of volatile memristors

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Science China(Information Sciences) 2018年第6期61卷 165-167页

作者： Vetriveeran rajamani Hyongsuk KIM Leon CHUA Division of Electronics and Information Engineering Chonbuk National University Division of Electronics Engineering and Intelligent robots research Center Chonbuk National University Department of Electrical Engineering and Computer Sciences University of California

Dear editor,Plenty of studies were introduced to understand the various properties of biological ***-Huxley(HH)axon model[1]is one among those studies which describes the initiation and propagation of an action potent... 详细信息

关键词： DrM POP Figure Morris-Lecar model of third-order barnacle muscle fiber is made of volatile memristors

Commensurate stacking within confined ultramicropores boosting acetylene storage capacity and separation efficiency

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Nano research 2023年第5期16卷 7742-7748页

作者： Zhenghui Huang Kungang Chai Chengjun Kang rajamani Krishna Zhaoqiang Zhang Guangxi Key Laboratory of Petrochemical resource Processing and Process Intensification Technology School of Chemistry and Chemical EngineeringGuangxi UniversityNanning 530004China Department of Chemical and Biomolecular Engineering National University of SingaporeSingapore 117585Singapore Van’t Hoff Institute for Molecular Sciences University of AmsterdamPark 904Amsterdam 1098 XHThe Netherlands

Developing advanced porous materials possessing both a high storage capacity and selectivity for acetylene(C_(2)H_(2))remains challenging but a sought-after *** we show a strategy involving synergic combination of spatial confinement and commensurate stacking for enhanced C_(2)H_(2)storage and capture via maximizing the host–guest and guest–guest *** ultramicroporous metal-organic frameworks(MOFs),MIL-160 and MOF-303 are elaborately constructed to exhibit ultrahigh C_(2)H_(2)uptakes of 235 and 195 cm^(3)·g^(−1),respectively,due to the confinement effect of the suitable pore sizes and periodically dispersed molecular recognition ***,C_(2)H_(2)capacity of MIL-160 sets a new benchmark for C_(2)H_(2)*** exceptional separation performances of two materials for C_(2)H_(2)over both CO_(2)and ethylene(C_(2)H_(4)),which is rarely observed,outperform most of the benchmark materials for C_(2)H_(2)*** scrutinized the origins of ultrahigh C_(2)H_(2)loading in the confined channels via theoretical *** superior separation efficiency for C_(2)H_(2)/CO_(2)and C_(2)H_(2)/C_(2)H_(4)mixtures with unprecedented C_(2)H_(2)trapping capacity(>200 L·kg^(−1))was further demonstrated by dynamic breakthrough experiments.

关键词： adsorption and separation acetylene storage commensurate stacking gas cluster metal-organic frameworks

Design of Online Vitals Monitor by Integrating Big Data and IoT

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Computer Systems Science & Engineering 2023年第3期44卷 2469-2487页

作者： E.Afreen Banu V.rajamani Department of Computer Science Engineering Vel Tech Multitech Dr.Rangarajan Dr.Sakunthala Engineering CollegeChennai600062India Department of Electronics&Communication Engineering Vel Tech Multitech Dr.Rangarajan Dr.Sakunthala Engineering CollegeChennai600062India

In this work,we design a multisensory IoT-based online vitals monitor(hereinafter referred to as the VITALS)to sense four bedside physiological parameters including pulse(heart)rate,body temperature,blood pressure,and periph-eral oxygen ***,the proposed system constantly transfers these signals to the analytics system which aids in enhancing diagnostics at an earlier stage as well as monitoring after *** core hardware of the VITALS includes commercial off-the-shelf sensing devices/medical equipment,a powerful microcontroller,a reliable wireless communication module,and a big data analytics *** extracts human vital signs in a pre-programmed interval of 30 min and sends them to big data analytics system through the WiFi module for further *** use Apache Kafka(to gather live data streams from connected sen-sors),Apache Spark(to categorize the patient vitals and notify the medical pro-fessionals while identifying abnormalities in physiological parameters),Hadoop Distributed File System(HDFS)(to archive data streams for further analysis and long-term storage),Spark SQL,Hive and Matplotlib(to support caregivers to access/visualize appropriate information from collected data streams and to explore/understand the health status of the individuals).In addition,we develop a mobile application to send statistical graphs to doctors and patients to enable them to monitor health conditions *** proposed system is implemented on three patients for 7 days to check the effectiveness of sensing,data processing,and data transmission *** validate the system accuracy,we compare the data values collected from established sensors with the measured readouts using a commercial healthcare monitor,the Welch Allyn®Spot *** pro-posed system provides improved care solutions,especially for those whose access to care services is limited.

关键词： Big data analytics blood pressure body temperature physiological parameters pulse rate sensors SPo2

Ultrafine tuning of the pore size in zeolite A for efficient propyne removal from propylene

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Chinese Journal of Chemical Engineering 2021年第9期34卷 217-221页

作者： Chaohui He rajamani Krishna Yang Chen Jiangfeng Yang Jinping Li Libo Li College of Chemistry and Chemical Engineering Shanxi Key Laboratory of Gas Energy Efficient and Clean UtilizationTaiyuan University of TechnologyTaiyuan 030024China Van’t Hoff Institute for Molecular Sciences University of AmsterdamScience Park 9041098 XH Amsterdamthe Netherlands Key Laboratory of Coal Science and Technology Taiyuan University of TechnologyTaiyuan 030024China

The removal of trace propyne(C_(3)H_(4))from propyne/propylene(C_(3)H_(4)/C_(3)H_(6))mixtures is a technical and challenging task during the production of polymer-grade propylene in view of their very similar size and physical *** some progress has been made,it is still very challenging to use some highly stable and commercially available porous materials via an energy-efficient adsorptive separation ***,we report the ultrafine tuning of the pore apertures in type-A zeolites for the highly efficient removal of trace amounts of C_(3)H_(4)from C_(3)H_(4)/C_(3)H_(6)*** resulting ion-exchanged zeolite 5 A exhibits a large C_(3)H_(4)adsorption capacity(2.3 mmol g^(-1)under 10^(-4)MPa)and high C_(3)H_(4)/C_(3)H_(6)selectivity at room temperature,which were mainly attributed to the ultrafine-tuned pore size that selectively blocks C_(3)H_(6)molecules,while maintaining the stro ng adsorption of C_(3)H_(4)at low pressure *** purity of C_(3)H_(6)(>99.9999%)can be directly obtained on this material under ambient conditions,as demonstrated by the experimental breakthrough curves obtained for both 1/99 and 0.1/99.9(V V)C_(3)H_(4)/C_(3)H_(6) mixtures.

关键词： Type-A zeolite Ion-exchange Pore tuning Propyne/propylene separation Breakthrough experiments

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Semiconducting SWCNT Photo Detector for High Speed Switching Through Single Halo Doping

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Computer Systems Science & Engineering 2023年第8期46卷 1617-1630页

作者： A.Arulmary V.rajamani T.Kavitha Department of Information and Communication Engineering Anna UniversityChennai600025TamilnaduIndia Department of Electronics and Communication Engineering VeltechMultitech Dr.RR Dr.SR Engineering CollegeChennai-42TamilnaduIndia

The method opted for accuracy,and no existing studies are based on this method.A design and characteristic survey of a new small band gap semiconducting Single Wall Carbon Nano Tube(SWCNT)Field Effect Transistor as a photodetector is carried *** the proposed device,better performance is achieved by increasing the diameter and introducing a new single halo(SH)doping in the channel length of the CNTFET *** paper is a study and analysis of the performance of a Carbon Nano Tube Field Effect Transistor(CNTFET)as a photodetector using the self-consistent Poisson and Green function *** 2D self-consistent Poisson and Green’s function method for various optical intensities and wavelength simulate this proposed *** performance study is based on the simulation of drain current,transconductance,sub-threshold swing,cut-off frequency,gain,directivity,and quantum efficiency under dark and illuminated *** quantum simulation results show that cut-off frequency increases while there is an increase in *** proposed SH-CNTFET provides better performance in terms of higher gain and directivity than conventional CNTFET(C-CNTFET).This device will be helpful in optoelectronic integrated circuits(OEIC)receivers due to its superior performance.

关键词： Single halo CNTFET self-consistent poisson equation green’s function photodetector