Testing of Automatic Inflatable Life Jacket in Open Jet Facility Phase II

An indigenous automatic inflatable life jacket was tested in the open jet facility to observe the effect of wind blast in the direction from toe to chin at a speed of about 170 knots. The jacket withstood the aerodynamic loads and no damage was observed during the test

Electrical spin injection, transport, and detection in graphene-hexagonal boron nitride van der Waals heterostructures: progress and perspectives

The current research in graphene spintronics strives for achieving a long spin lifetime, and efficient spin injection and detection in graphene. In this article, we review how hexagonal boron nitride (hBN) has evolved as a crucial substrate, as an encapsulation layer, and as a tunnel barrier for manipulation and control of spin lifetimes and spin injection/detection polarizations in graphene spin valve devices. First, we give an overview of the challenges due to conventional SiO$_2$ substrate for spin transport in graphene followed by the progress made in hBN based graphene heterostructures. Then we discuss in detail the shortcomings and developments in using conventional oxide tunnel barriers for spin injection into graphene followed by introducing the recent advancements in using the crystalline single/bi/tri-layer hBN tunnel barriers for an improved spin injection and detection which also can facilitate two-terminal spin valve and Hanle measurements, at room temperature, and are of technological importance. A special case of bias induced spin polarization of contacts with exfoliated and chemical vapour deposition (CVD) grown hBN tunnel barriers is also discussed. Further, we give our perspectives on utilizing graphene-hBN heterostructures for future developments in graphene spintronics.Comment: Review, Author submitted manuscript - draft; 25 pages, 8 figure

Experimental investigation of Carbon dioxide absorption in a packed bed tower

The continuous and unabated emission of CO2 from various industrial sources is a worrying sign for the future of this planet as it leads to global warming and alarmingly changing the geo-political and meteorological scenario of the world and at a faster rate. There has been an extensive research going on across various laboratories around the globe to mitigate this problem. Absorption using amine solutions, ionic liquids; adsorption on porous structural frameworks like zeolites, metal organic frameworks; natural storage (or, sequestration) under the favorable geological formations (under earth’s crust, ocean floor); chemical conversion to useful products are a few of the many steps that have been taken to address the issue. Although, a few of them have overcome the technological challenges and satisfies the economic feasibility and already implemented across various industries but many of the processes are yet to come out of their infancy and still at the nascent stage (lab stage) of their development before being implemented. In this project, CO2 was removed from (CO2+air) mixture using aqueous NaOH solution as the solvent in a packed bed absorption column. The column was operated counter currently using raschig ring as the packing material being randomly packed inside the column. CO2 removal efficiency was found to satisfactory approximately varying between 50-80% under various operational conditions. The effect of solvent flow rate on removal percentage was found to be important. The height of a transfer unit (HTU) and number of transfer units (NTU) were also calculated. Finally, overall mass transfer coefficients were also calculated from the absorption dat

RNAi efficiency, systemic properties, and novel delivery methods for pest insect control : what we know so far

In recent years, the research on the potential of using RNA interference (RNAi) to suppress crop pests has made an outstanding growth. However, given the variability of RNAi efficiency that is observed in many insects, the development of novel approaches toward insect pest management using RNAi requires first to unravel factors behind the efficiency of dsRNA-mediated gene silencing. In this review, we explore essential implications and possibilities to increase RNAi efficiency by delivery of dsRNA through non-transformative methods. We discuss factors influencing the RNAi mechanism in insects and systemic properties of dsRNA. Finally, novel strategies to deliver dsRNA are discussed, including delivery by symbionts, plant viruses, trunk injections, root soaking, and transplastomic plants

CORONAVIRUS DISEASE 2019(COVID-19)

Publishers announced to extend peer-reviewed publications accessible freely, more than 32,000 articles, chapters, and other resources. These e-resources related to COVID- 19, different types of coronaviruses and related epidemics

Breeding behaviour in Macrobrachium rosenbergii (De Man)

During the course of experimentations on the inducement of breeding in Macrobrachium rosenbergii (De Man) under laboratory conditions, detailed observations on the mating behaviour of the species have been made, which have been elaborated in this account. Various behaviour patterns have been analysed critically and the probable directive and releasive factors for these behaviour patterns discussed. Differences in behaviour of the male resulting from the introduction of another mature male in the arena have been described. An aberrant displacement activity which has been observed in one of the males has also been discussed

Spin transport in graphene - hexagonal boron nitride van der Waals heterostructures

De huidige micro-elektronicatechnologie gebruikt de ladingseigenschappen van een elektron voor informatieverwerking. Om de uitdagingen, zoals de vermogensdissipatie en downscaling van de elektronische apparaten te overwinnen, onderzoekt het vakgebied spintronica (spin-gebaseerde elektronica) een extra intrinsieke eigenschap van het elektron, spin genoemd, welke een puur kwantummechanische eigenschap is. Grafeen, een één-atomige tweedimensionale laag koolstofatomen, is de laatste tien jaar ontstaan als een veelbelovend materiaal voor spintronica-toepassingen. Het onderzoek dat in dit proefschrift gepresenteerd wordt, behandelt de uitdagingen in grafeen-spintronica als gevolg van het onderliggende substraat, onzuiverheden op het oppervlak van grafeen en de kwaliteit van de ferromagnetische tunnelingcontacten. Hiervoor introduceren we een nieuwe device-geometrie waarbij grafeen volledig is ingekapseld tussen twee hexagonale boornitride (hBN) lagen. We laten zien dat hBN een schone tunnelbarrière-grafeeninterface biedt die lange afstand-spintransport in grafeen mogelijk maakt. Verder laten we zien dat het mogelijk is om spin-injectie en detectiepolarisaties tot ± 100% te bereiken en een unieke tekeninversie van spinsignalen te maken door toepassing van een elektrisch veld over de ferromagnetische tunnelingcontacten. We hebben ook grootschalige, met chemische dampafzetting (CVD) gekweekte hBN als tunnelbarrières gebruikt en onze studie wijst op het belang van de kwaliteit en de kristallografische oriëntatie van hBN bij het bepalen van de tunnelingkenmerken. De resultaten die gepresenteerd worden in dit proefschrift vertegenwoordigen belangrijke ontwikkelingen in het begrijpen van de aard van spintransport in grafeen en spin-injectie via hBN-barrieres. Dit inzicht zal zeker helpen bij het overwinnen van de uitdagingen bij het realiseren van praktische spintronische devices gebaseerd op grafeen-hBN-van der Waals-heterostructuren