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Infra-red Studies of Reactions on Oxide Surfaces: Part 1.— Boron Trifluoride on Silica

Morrow, B. A.; Devi, A. (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972)

Infra-red spectroscopy has been used to study the adsorption of boron trifluoride on silica. On highly dehydroxylatcd samples chemisorption is rapid and the major product initially appears to be a surface SiOBF2 species. ...

Infra-red Studies of Carboxylic Acid Vapours Adsorbed on Evaporated Germanium Films

Howe, R. F.; Metcalfe, A. (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972)

An experimental method has been developed for the observation of infra-red spectra of molecules adsorbed on germanium surfaces. The interactions of formic, acetic and propionic acids with germanium surfaces have been ...

Dissociation Equilibrium of Nitroform in Polar Solvents Studied by Pulse Radiolysis

Chaudhri, Shamim A.; Asmus, K. D. (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (3), 1972)

The dissociation equilibrium C(NO2)3H --- C(NO2)3+Hsol and the related kinetics have been studied for various solvents (alcohols, acetone, and water) by means of pulse radiolysis. Nitroform anions were produced by ...

Lattice Defects in Plastic Organic Crystals: Part 7.—Isotope Mass Effects in Self-diffusion in Cyclohexane

Chadwick, A. V.; Sherwood, J. N. (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (1), 1972)

A study has been made of the diffusion of the species 12C514C11H12 and 12C62H113H1 in single crystals of cyclohexane at 242 K. The measured diffusion coefficients are in good agreement with previously published values. An ...

Infra-Red Study of the Adsorption of Ammonia on MgO: Part 2.—The Hydrated Surface

Tench, A J (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (2), 1972)

Ammonia is weakly adsorbed on hydrated MgO by hydrogen-bonding of the nitrogen to hydroxyl groups exposed on the surface and a strong band at 3045 cm-1 is attributed to surface hydroxyl groups perturbed by the adsorbed ...

Infra-Red Study of the Adsorption of Ammonia on MgO: Part 1.—The Dehydrated Surface

Tench, A J; Giles, D (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1972, 68 (2), 1972)

The adsorption of ammonia gas has been studied on dehydrated MgO. The symmetrical bending vibration v2 of ammonia is considerably perturbed by the presence of the surface and a doubling of this band is observed at low ...

Modeling and analysis of Caputo-type fractional-order SEIQR epidemic model

Das, Dhiraj Kumar (Springer, 2023-11)

In this research, a susceptible-exposed-infected-quarantine-recovered-type epidemic model containing fractional-order differential equations is suggested and examined in order to better understand the dynamical behavior ...

Threshold dynamics of an age-structured vaccinated epidemic model with both direct and indirect routes of infections

Das, Dhiraj Kumar (Elsevier, 2024-04)

Age-structured epidemic models play a crucial role in the study of epidemiological modeling. Motivated by this, in this article, we propose an epidemic model with age since infection and vaccination age of individuals, a ...

Complex dynamics of a fractional-order epidemic model with saturated media effect

Das, Dhiraj Kumar (Springer, 2024-07)

A four-compartmental fractional-order epidemic model has been investigated to understand the transmission mechanism of infectious diseases with the population’s memory effect. The existence and uniqueness criterion of the ...

Qualitative analysis of TB transmission dynamics considering both the age since latency and relapse

Das, Dhiraj Kumar (Elsevier, 2024-11)

Since the beginning of time, tuberculosis (TB) has been a fatal illness that predominantly affects the human lungs before spreading to other organs including the brain, spine, etc. The main elements of TB mitigation are ...

Spatially heterogeneous eco-epidemic model: Stabilizing role of non-local disease transmission

Das, Dhiraj Kumar (Elsevier, 2024-07)

Interaction between prey and predator in the presence of an infectious pathogen is the main focus of this article. A non-local transmission, that encompasses the possibility of acquiring infection from a distanced potential ...

Analysis of a chronological age-structured epidemic model with a pair of optimal treatment controls

Das, Dhiraj Kumar (IOP, 2024-11)

Emerging infectious diseases are one of the core concerns in epidemiology, and they often lead to a global public health emergency and consequently affect socio-economic sectors. The risk of contracting an infection varies ...

A parameter-uniform implicit scheme for two-parameter singularly perturbed parabolic problems

Kumar, Devendra (2023)

A parameter-uniform implicit approach for two-parameter singularly perturbed boundary valueproblems is constructed. On the solution derivatives, sharp limits are presented. The solution is additionallydivided into regular ...

Modeling and Applications in Operations Research

Shekhar, Chandra (Taylor & Francis, 2023)

The text envisages novel optimization methods that significantly impact real-life problems, starting from inventory control to economic decision-making. It discusses topics such as inventory control, queueing models, ...

Reliability analysis of standby provision multi-unit machining systems with varied failures, degradations, imperfections, and delays

Shekhar, Chandra (Wiley, 2023-08)

This prospective study focuses on analyzing the reliability characteristics of multi-unit systems with standby provisioning, accounting for failures, degradation, random delays, and probabilistic imperfections. The ...

Transient analysis of queueing-based congestion with differentiated vacations and customer’s impatience attributes

Shekhar, Chandra (Springer, 2023-06)

This research article studies the critical issue of the single-server congestion problem with prominent customer impatience attributes and server strategic differentiated vacation. Despite their apparent practical relevance, ...

Congestion analysis of finite tandem queueing network

Shekhar, Chandra (IEEE, 2023)

This paper introduces a focused model for analyzing congestion in finite tandem networks, a crucial aspect in queueing theory with far-reaching implications for system efficiency. By examining job flow through nodes, Node-1 ...

Transformation-based stationary analysis of single server feedback fluid queue: an enhanced approach

Shekhar, Chandra (IEEE, 2023)

The objective of this research article is to present innovative mathematical expressions that describe the steady-state distribution of buffer content within a fluid queue influenced by an M/M/1 queue with feedback. The ...

Optimal management strategies of renewable energy systems with hyperexponential service provisioning: an economic investigation

Shekhar, Chandra (Frontiers, 2023-12)

The current research proposes optimal management strategies for queueing modeling-based renewable energy systems with hyper-exponentially distributed maintenance/repair under the assumption of an admission control policy. ...

Cost analysis of a finite capacity queue with server failures, balking, and threshold-driven recovery policy

Shekhar, Chandra (IJMEMS, 2024-07)

The study is on the cost dynamics which is concerned with finite queues in particular to susceptibility to server outages, threshold-driven recovery and Catastrophic events, but main focus is on balking behaviour of the ...

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