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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

Sufficiency and Duality for Nonsmooth Interval-Valued Optimization Problems via Generalized Invex-Infine Functions

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Journal of the Operations Research Society of China 2023年第3期11卷 505-527页

作者： Izhar Ahmad krishna Kummari S.Al-Homidan Department of Mathematics and Statistics King Fahd University of Petroleum and MineralsDhahran31261Saudi Arabia Department of Mathematics School of ScienceGITAMHyderabad CampusHyderabad502329India

In this paper,a new concept of generalized-affineness type of functions is *** class of functions is more general than some of the corresponding ones discussed in Chuong(Nonlinear Anal Theory Methods Appl 75:5044–5052,2018),Sach et al.(J Global Optim 27:51–81,2003)and Nobakhtian(Comput Math Appl 51:1385–1394,2006).These concepts are used to discuss the sufficient optimality conditions for the interval-valued programming problem in terms of the limiting/Mordukhovich subdifferential of locally Lipschitz ***,two types of dual problems,namely Mond–Weir type and mixed type duals are formulated for an interval-valued programming problem and usual duality theorems are *** results improve and generalize the results appeared in Kummari and Ahmad(UPB Sci Bull Ser A 82(1):45–54,2020).

关键词： Mordukhovich subdifferential Locally Lipschitz functions Generalized invex-infine function Interval-valued programming LU-optimal Constraint qualifications Duality

Impact of the penetration of distributed generation on optimal reactive power dispatch

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Protection and Control of Modern Power Systems 2020年第1期5卷 352-377页

作者： Tanmay Das Ranjit Roy Kamal krishna Mandal Department of Power Engineering Jadavpur UniversityKolkataIndia Department of Electrical Engineering Chaibasa Engineering CollegeChaibasaJharkhandIndia

Optimal reactive power dispatch(ORPD)is a complex and non-linear problem,and is one of the sub-problems of optimal power flow(OPF)in a power *** is formulated as a single-objective problem to minimize the active power loss in a transmission *** this work,power from distributed generation(DG)is integrated into a conventional power system and the ORPD problem is solved to minimize transmission line power *** proves that the application of DG not only contributes to power loss minimization and improvement of system stability but also reduces energy consumption from the conventional sources.A recently proposed meta-heuristic algorithm known as the JAYA algorithm is applied to the standard IEEE 14,30,57 and 118 bus systems to solve the newly developed ORPD problem with the incorporation of *** simulation results prove the superiority of the JAYA algorithm over *** respective optimal values of DG power that should be injected into the four IEEE test systems to obtain the minimum transmission line power losses are also provided.

关键词： Active power loss Distributed generation DG penetration JAYA algorithm Optimization problem ORPD Particle swarm optimization Variants of PSO Transmission line losses

Changes in regeneration and leaf traits of Rhododendron campanulatum along a treeline ecotone in central Nepal

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Journal of Mountain Science 2020年第3期17卷 602-613页

作者： SHARMA Prasad krishna TIWARI Achyut SHRESTHA Babu Bharat Central Department of Botany Tribhuvan UniversityKathmandu44613Nepal Budhanilkantha School Kathmandu44622Nepal

Changes in population structure and plant functional traits across environmental gradient in the near natural treeline is a critical determinant of environmental changes in treelines. In this study we analyzed population characteristics and leaf traits of Rhododendron campanulatum across treeline ecotone in a trans-Himalayan region of Mustang district in central Nepal. Along 4 vertical transects, a total of 72 quadrats(5 m × 5 m)-34 above Betula utilis treeline and 38 below treeline-were sampled to analyze the population structure, regeneration,specific leaf area(SLA) and leaf-stem relationship of R. campanulatum. Our results showed that the regeneration of R. campanulatum was fairly good in both habitats, as evident from density-diameter *** species showed type Ⅲ survivorship curve in both habitats with the highest mortality during early stage of life. However, the seedling density and mortality was higher below treeline than above treeline. Canopy cover and basal cover were found to be the major factors affecting regeneration, as indicated by higher number of juveniles in relatively open areas above treeline. The total leaf area increased(p <0.001) with stem cross-section area in both habitats. However, the SLA was higher below treeline(55 cm^2/g) than above(47 cm^2/g)(p < 0.001);it also increased with the canopy cover of trees(R^2 =0.59, p <0.001) below the treeline. In conclusion,high density of juvenile, low mortality of seedlings,and low SLA above treeline indicated that the species has successfully adapted in climatically stressful alpine habitat with potential to expand upward.

关键词： Rhododendron Climate change Life table Mortality Specific leaf area Mustang district

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

Hepatocellular carcinoma-time to take the ticket

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World Journal of Gastrointestinal Surgery 2019年第6期11卷 287-295页

作者： Anju Mullath Murali krishna Department of Gastroenterology Lakeshore Hospital and Research CentreKochi 682040KeralaIndia Department of Surgery Military HospitalPalampur 176061Himachal PradeshIndia

Hepatocellular carcinoma is one of the leading malignancies *** detection of hepatocellular carcinoma and its management in the form of liver transplantation offers an attractive treatment *** Milan criteria,proposed by Mazzaferro et al,have been the standard for selecting patients with hepatocellular carcinoma for ***,several studies have shown that even patients selected outside the Milan criteria can undergo transplantation with a relatively good *** article examines the currently existing criteria other than the Milan criteria and also evaluates use of alpha-fetoprotein and positron emission tomography scans to predict the chance of recurrence.

关键词： Hepatocellular carcinoma Milan Alpha-fetoprotein Positron emission tomography

A Fifth Order Alternative Mapped WENO Scheme for Nonlinear Hyperbolic Conservation Laws

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Advances in Applied Mathematics and Mechanics 2022年第1期14卷 275-298页

作者： Uttam Singh Rajput krishna Mohan Singh Department of Mechanical and Industrial Engineering Indian Institute of Technology RoorkeeRoorkee 247667India

In this work,we have developed a fifth-order alternative mapped weighted essentially nonoscillatory(AWENO-M)finite volume scheme using non-linear weights of mapped WENO reconstruction scheme of Henrick et al.(***.,207(2005),pp.542-567)for solving hyperbolic conservation *** reconstruction of numerical flux is done using primitive variables instead of conservative *** present scheme results in less spurious oscillations near discontinuities and shows higher-order accuracy at critical points compared to the alternative WENO scheme(AWENO)based on traditional non-linear weights of Jiang and Shu(***.,228(1996),pp.202-228).The third-order Runge-Kutta method has been used for solution advancement in *** Harten-Lax-van Leer-Contact(HLLC)shock-capturing method is used to provide necessary upwinding into the *** performance of the present scheme is evaluated in terms of accuracy,computational cost,and resolution of discontinuities by using various one and two-dimensional test cases.

关键词： High resolution scheme unsteady non-linear weights numerical fluxes alternative WENO scheme hyperbolic equations

Cryptomycota: the missing link

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Protein & Cell 2012年第3期3卷 161-162页

作者： krishna Bolla Elizabeth Jane Ashforth Key Laboratory of Pathogenic Microbiology and Immunology Institute of MicrobiologyChinese Academy of SciencesBeijing 100190China􀀍

Fungi have been well studied for 150 years and it was thought that there was a good understanding of the major evolutionary groups,but new findings by UK researchers from the University of Exeter have radically changed this *** a local pond near the Exeter University,UK,they discovered a diverse and deep evolutionary branch of fungi named Cryptomycota(Greek:crypto,hidden;mycota,fungi)that has now doubled our knowledge of fungal diversity.

关键词： doubled branch Cry

A mathematical study of a predator-prey model with disease circulating in the both populations

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International Journal of Biomathematics 2015年第2期8卷 1-27页

作者： krishna Pada Das J. Chattopadhyay Department of Mathematics Mahadevananda Mahavidyalaya Barrackpore Kolkata 700120 India Agricultural and Ecological Research UnitIndian Statistical Institute 203 B. T. Road Kolkata 700108 India

Disease in ecological systems plays an important role. In the present investigation we propose and analyze a predator-prey mathematical model in which both species are affected by infectious disease. The parasite is transmitted directly （by contact） within the prey population and indirectly （by consumption of infected prey） within the predator population. We derive biologically feasible and insightful quantities in terms of ecological as well as epidemiological reproduction numbers that allow us to describe the dynamics of the proposed system. Our observations indicate that predator-prey system is stable without disease but high infection rate drive the predator population toward extinction. We also observe that predation of vulnerable infected prey makes the disease to eradicate into the community composition of the model system. Local stability analysis of the interior equilibrium point near the disease-free equilibrium point is worked out. To study the global dynamics of the system, numerical simulations are performed. Our simulation results show that for higher values of the force of infection in the prey population the predator population goes to extinction. Our numerical analysis reveals that predation rates specially on susceptible prey population and recovery of infective predator play crucial role for preventing the extinction of the susceptible predator and disease propagation.

关键词： Prey predator disease in both populations reproduction number predation oscillation treatment.