present communication
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Materials ◽  
2022 ◽  
Vol 15 (2) ◽  
pp. 597
Author(s):  
Souvik Roy ◽  
Santanu K. Maiti ◽  
Laura M. Pérez ◽  
Judith Helena Ojeda Silva ◽  
David Laroze

We explore the localization properties of a double-stranded ladder within a tight-binding framework where the site energies of different lattice sites are distributed in the cosine form following the Aubry–André–Harper (AAH) model. An imaginary site energy, which can be positive or negative, referred to as physical gain or loss, is included in each of these lattice sites which makes the system a non-Hermitian (NH) one. Depending on the distribution of imaginary site energies, we obtain balanced and imbalanced NH ladders of different types, and for all these cases, we critically investigate localization phenomena. Each ladder can be decoupled into two effective one-dimensional (1D) chains which exhibit two distinct critical points of transition from metallic to insulating (MI) phase. Because of the existence of two distinct critical points, a mixed-phase (MP) zone emerges which yields the possibility of getting a mobility edge (ME). The conducting behaviors of different energy eigenstates are investigated in terms of inverse participation ratio (IPR). The critical points and thus the MP window can be selectively controlled by tuning the strength of the imaginary site energies which brings a new insight into the localization aspect. A brief discussion on phase transition considering a multi-stranded ladder was also given as a general case, to make the present communication a self-contained one. Our theoretical analysis can be utilized to investigate the localization phenomena in different kinds of simple and complex quasicrystals in the presence of physical gain and/or loss.


2022 ◽  
Vol 0 (0) ◽  
Author(s):  
Siddhartha Dutta ◽  
Subhasis Roy ◽  
Kousik Mukherjee

Abstract Present communication deals with the design and analysis of all-optical NOR and NAND gates using Quantum dot Semiconductor Optical Amplifiers (QDSOA). The design uses no interferometer structure but cross gain modulation is utilized for operation. The structures are simple and simulations at a rate of 1 Tb/s are processed. For unsaturated gain 30 dB, the logic gates show high values of ER (29.82 dB, 16.93 dB), CR (29.6 dB, 21.33 dB), and Q (25.4 dB, 13.2 dB). This ensures practical feasibility and high quality of the proposed gates.


2021 ◽  
Vol 13 (14) ◽  
pp. 20295-20298
Author(s):  
S.S. Talmale ◽  
Avtar Kaur Sidhu ◽  
Uttam Saikia

Birch mice are grouped under the monotypic genus Sicista Gray, 1827 and placed under the family Sminthidae. They are distributed over the Palearctic ream and the fragmented population of the species Sicista concolor reported from China, North Pakistan and India in Himalayan region. The present communication is a range extension of the Kashmir Birch mouse, Sicista concolor leathemi in Indian Himalaya and first report from Himachal Pradesh.


MAUSAM ◽  
2021 ◽  
Vol 62 (4) ◽  
pp. 577-584
Author(s):  
S.L. JAIN

The ozone in the stratosphere is of great importance for very survival of life on the mother planet the Earth. Ozone acts as an umbrella and protects us from the harmful ultraviolet radiations coming from the Sun. The catalytic destruction of ozone by ClOx & NOx in general and ozone hole phenomenon over Antarctica during spring time in particular has generated unprecedented interest in monitoring of ozone and other trace constituents in the atmosphere. The satellites have proved to be an important tool to monitor the global ozone column on regular basis. The ozone data using various satellite platforms has been analyzed for the ozone hole studies over north and south poles. Also Ozone measurements were carried out at Maitri, Antarctica. The satellite data indicates that some recovery of ozone hole as a result of international efforts in reduction of use of CFCs which are the main culprit for ozone hole. However, it will be too early to conclude about ozone hole recovery. In the present communication current status of ozone hole will be discussed in detail.


2021 ◽  
Vol 8 (1) ◽  
pp. 63-69
Author(s):  
Bashida Massar

The present communication is the result of the analysis of drinking water of Lapalang village in Pynursla Block, East Khasi Hills District of Meghalaya performed in order to rule out the unscientific claims by villagers that the village drinking water is likely to have high concentration of lime. Water samples collected from the source (spring), storage tank and tap are analyzed in State food testing laboratory, Directorate of Health Services, Government of Meghalaya. The study shows that spring water is fit for consumption, however the same water supply collected from storage tank and tap is highly contaminated with coliform bacteria.


2021 ◽  
Vol 25 (12) ◽  
pp. 10-18
Author(s):  
D.S. Seetharam ◽  
H. Ramakrishna

The present palaeopalynological study deals with the significance of non - striate disaccate pollen from bore hole Q - 563 of Yellandu coalfield (Jawahar Khani - 5 coal block), Kothagudem sub-basin and to determine the age and palaeoclimatic interpretations of the study area based on the pollen morphological characters. For the palynological investigation, sixty samples were thoroughly analyzed in which fairly diversified palynofloral assemblages of Gondwanic affinity were recorded. About 30 genera and 50 species of palynomorphs, belong to Glossopteridales, Coniferales, Cordaitales of gymnospermous pollen, pteridophytic spores. In the present communication, the palynoflora belongs to Glossopteridales viz. Scheuringipollentites barakarensis, S. maximus, S. tentulus, Ibisporites diplosaccus, Primuspollenites levis, P. densus and Sahnites thomasii etc. Frequency distribution pattern of the palynotaxa reveals that the assemblage is dominated by the non - striate disaccates followed by striate disaccates, monosaccates (gymnosperms) and pteridophytic spores. The diversified palynoassemblage of both non striate and striate disaccates pollen strongly signifies that the Yellandu coal belt of Godavari graben belongs to Barakar Formation of Early Permian age (Late Sakmarian – Early Artinskian). Predominance of non - striate disaccate pollen recorded from the Yellandu sediments indicates a warm and high humid climatic condition with fluvial environment of deposition.


2021 ◽  
Vol 25 (12) ◽  
pp. 68-71
Author(s):  
D.L.N. Somayajulu ◽  
A.V.L.N.S.H. Hariharan ◽  
Y. Subhash

Present communication describes the attempts made to improve the yields of thiazolidinedione group of derivatives keeping in view of their anti-cancer activity. 5-benzylidine-1,3-thiazolidine-2,4-dione derivatives were the active substrates belonging to α-glucosidase inhibitor classification. These were prepared by the reaction of 4-((Z)-(2,4-dioxothiazolidin-5-ylidene) methyl) benzaldehyde with aromatic/hetero aromatic ketones in the presence of potassium hydroxide and ethanol as solvent. Synthesis of 5-benzylidine-1, 3-thiazolidine-2,4-dione derivatives has been optimized under solvent free condition by screening with different bases in order to achieve the required target (of improving the yields). The solvent free condition has resulted in excellent improvement in yields and reduced the manufacturing cost significantly.


Author(s):  
S. A. Khedkar ◽  
J. S. Patil ◽  
P. M. Sabale

Drug design and development is an interactive process includes process like molecular docking which involves virtual analysis of the derivatives against the protein targets. COXS are the groups of enzymes which plays vital role in the human process. COX II is important enzyme involved in the inflammation and can act as potential target for development of the potent anti-inflammatory agents. Pyrimidine is one of the most utilized heterocyclic scaffolds for the development of therapeutic agents due to its role in the nucleic acid and proteins in the human body. The present communication deals with docking analysis of virtually designed 58 condensed pyrimidine derivatives as potential anti-inflammatory agents. The derivatives were designed and virtually screened via molecular docking against the COX-II crystal structure to identically the potential leads.


Author(s):  
P. Sarkar S. Basu ◽  
K. Ray A. Saren ◽  
D. Mandal S. Das ◽  
C. K. Ghosh

Pyometra is one of the most common diseases in intact bitches. The aim of the present communication was to evaluate the effectiveness of medical treatment for the close pyometra in a bitch. The diagnosis of pyometra was made by correlating the history and clinical signs with the findings of abdominal palpation and ultrasonography. The physiological, haematological and biochemical parameters were evaluated before and after treatment. Treatment of canine pyometra using a combination of progesterone receptor blocker (Mifepristone), anti-prolactin (Cabergoline) along with supportive therapy showed very efficacious alternative option over traditional ovario-hysterectomy (OHE) or which are critical for operative procedure.


2021 ◽  
Author(s):  
David E Williams

AbstractRecent work (Khoury et al.,Nature Medicine2021, 27 (7), 1205-1211) has shown that measurement of IgG antibody concentration in blood correlates well with vaccine efficacy. The present communication builds on this work and considers the probability of infection given immunity, taking into account the distribution across the population of antibody concentration in vaccinated or convalescent people. The model is consistent with the observed rates of breakthrough infection following vaccination or previous infection. The model is then developed to consider the use of quantitative measurement of antibody concentration on arrival as an aid to risk stratification of travellers. The model indicates that such a measurement could significantly decrease the quarantine time required to achieve a given level of importation risk.


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