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How ion beam modifies thin films surface of a binary compound has been shown here.
Ion induced nanopatterning of CoSI binary alloy surfaces
Ion induced nanopatterning of CoSI binary alloy surfaces
Dr. Basanta Kumar Parida
Plasma is a mixed state of ions and neutral atoms and electrons
plasma in ion source and sputtering systems
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Dr. Basanta Kumar Parida
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How ion beam can change the surface in nanometer scale.
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Lower sputtering yield of the discharge wall material is a crucial parameter for the performance of Hall Effect Thruster (HET) [1, 2]. In this article, we report the sputtering yield of HET wall material BNSiO2 (borosil) at elevated temperature ~600 °C using quartz crystal microbalance (QCM). We observe a linear increase in the sputtering yield with temperature and it remains stable during long duration experiments using Xe ions. Two different crystallographic orientations of borosil give a slight variation in the yield. The higher yields for higher operating temperatures is proposed to be due to the thermal spike nature. Microscopic surface morphology shows only different grains of BNSiO2, however high resolution nanoscopic view reveals the formation of nanoripple like structures over different grains [3]. The periodicity of such features increases with ion dose (sputtering time) and temperature in the range of 70-190 nm. Local curvature dependent erosion plays crucial role in such pattern formation [4]. Reference: 1. D.M. Goebel, I. Katz, Fundamentals of Electric Propulsion, Ion and Hall Thrusters, 2008. 2. M. Ranjan, A. Sharma, A. Vaid, T. Bhatt, V. Nandalan, M.G. James, H. Revathi, S. Mukherjee, AIP Adv. 6 (2016) 95224 3. R. M. Bradley, J.M.E. Harper, J. Vac. Sci. Technol. A 6 (1988) 2390 4. B. K. Parida, Sooraj K P, S. Hans, V. Pachchigar, S. Augustine, Remyamol T, M. R. Ajith, M. Ranjan; Nucl. Inst and Methods B, 514 (2022) 1-7
Sputtering yield and nanopattern formation study of BNSiO2 (Borosil) at eleva...
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How ion beam modifies thin films surface of a binary compound has been shown here.
Ion induced nanopatterning of CoSI binary alloy surfaces
Ion induced nanopatterning of CoSI binary alloy surfaces
Dr. Basanta Kumar Parida
Plasma is a mixed state of ions and neutral atoms and electrons
plasma in ion source and sputtering systems
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Dr. Basanta Kumar Parida
physical vapor deposition system
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How ion beam can change the surface in nanometer scale.
Ion beam nanopatterning of binary alloy
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Dr. Basanta Kumar Parida
Lower sputtering yield of the discharge wall material is a crucial parameter for the performance of Hall Effect Thruster (HET) [1, 2]. In this article, we report the sputtering yield of HET wall material BNSiO2 (borosil) at elevated temperature ~600 °C using quartz crystal microbalance (QCM). We observe a linear increase in the sputtering yield with temperature and it remains stable during long duration experiments using Xe ions. Two different crystallographic orientations of borosil give a slight variation in the yield. The higher yields for higher operating temperatures is proposed to be due to the thermal spike nature. Microscopic surface morphology shows only different grains of BNSiO2, however high resolution nanoscopic view reveals the formation of nanoripple like structures over different grains [3]. The periodicity of such features increases with ion dose (sputtering time) and temperature in the range of 70-190 nm. Local curvature dependent erosion plays crucial role in such pattern formation [4]. Reference: 1. D.M. Goebel, I. Katz, Fundamentals of Electric Propulsion, Ion and Hall Thrusters, 2008. 2. M. Ranjan, A. Sharma, A. Vaid, T. Bhatt, V. Nandalan, M.G. James, H. Revathi, S. Mukherjee, AIP Adv. 6 (2016) 95224 3. R. M. Bradley, J.M.E. Harper, J. Vac. Sci. Technol. A 6 (1988) 2390 4. B. K. Parida, Sooraj K P, S. Hans, V. Pachchigar, S. Augustine, Remyamol T, M. R. Ajith, M. Ranjan; Nucl. Inst and Methods B, 514 (2022) 1-7
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Low energy ion beam nanopatterning of CoxSi1-x Surfaces
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When ion beam is bombarded on a solid surface self organised nanostructures can be formed.
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Ion beam irradiation of solid surface often produces nanoscale ripples on solid surface. These ripples show a change in electrical conduction.
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ion induced nanopatterning of binary compound
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A botany file is similar to a chemistry practical file but specifically focuses on experiments and observations related to plants. It typically includes detailed descriptions of plant-related experiments, such as germination studies, growth experiments, tissue culture techniques, plant anatomy investigations, and ecological surveys. The file may contain records of plant specimens collected, their classification, characteristics, and ecological significance. Additionally, it may include diagrams, photographs, drawings, tables, and data analysis related to plant research. Like a chemistry practical file, a botany file serves as a documentation of practical work conducted in the field of botany and is often used for assessment and educational purposes.
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Understanding circumstellar disks is of prime importance in astrophysics, however, their birth process remains poorly constrained due to observational and numerical challenges. Recent numerical works have shown that the small-scale physics, often wrapped into a sub-grid model, play a crucial role in disk formation and evolution. This calls for a combined approach in which both the protostar and circumstellar disk are studied in concert. Aims. We aim to elucidate the small scale physics and constrain sub-grid parameters commonly chosen in the literature by resolving the star-disk interaction. Methods. We carry out a set of very high resolution 3D radiative-hydrodynamics simulations that self-consistently describe the collapse of a turbulent dense molecular cloud core to stellar densities. We study the birth of the protostar, the circumstellar disk, and its early evolution (< 6 yr after protostellar formation). Results. Following the second gravitational collapse, the nascent protostar quickly reaches breakup velocity and sheds its surface material, thus forming a hot (∼ 103 K), dense, and highly flared circumstellar disk. The protostar is embedded within the disk, such that material can flow without crossing any shock fronts. The circumstellar disk mass quickly exceeds that of the protostar, and its kinematics are dominated by self-gravity. Accretion onto the disk is highly anisotropic, and accretion onto the protostar mainly occurs through material that slides on the disk surface. The polar mass flux is negligible in comparison. The radiative behavior also displays a strong anisotropy, as the polar accretion shock is shown to be supercritical whereas its equatorial counterpart is subcritical. We also f ind a remarkable convergence of our results with respect to initial conditions. Conclusions. These results reveal the structure and kinematics in the smallest spatial scales relevant to protostellar and circumstellar disk evolution. They can be used to describe accretion onto regions commonly described by sub-grid models in simulations studying larger scale physics.
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Wepresent Atacama Large Millimeter/submillimeter Array 12-m, 7-m, and Total Power Array observations of the FUOrionis outbursting system, covering spatial scales ranging from 160 to 25,000 au. The high-resolution interferometric data reveal an elongated 12CO(2–1) feature previously observed at lower resolution in 12CO(3–2). Kinematic modeling indicates that this feature can be interpreted as an accretion streamer feeding the binary system. The mass infall rate provided by the streamer is significantly lower than the typical stellar accretion rates (even in quiescent states), suggesting that this streamer alone is not massive enough to sustain the enhanced accretion rates characteristic of the outbursting class prototype. The observed streamer may not be directly linked to the current outburst, but rather a remnant of a previous, more massive streamer that may have contributed enough to the disk mass to render it unstable and trigger the FU Orionis outburst. The new data detect, for the first time, a vast, slow-moving carbon monoxide molecular outflow emerging from this object. To accurately assess the outflow properties (mass, momentum, and kinetic energy), we employ 13CO(2–1) data to correct for optical depth effects. The analysis indicates that the outflow corresponds to swept-up material not associated with the current outburst, similar to the slow molecular outflows observed around other FUor and Class I protostellar objects.
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Cotton crops are vulnerable to a variety of sucking pests, which can severely impact plant health, yield, and fiber quality. These pests primarily feed on plant sap, extracting nutrients directly from the plant's vascular system. Here's a breakdown of some of the most significant sucking pests in cotton cultivation: Aphids: Cotton aphids or melon aphids can cause direct damage by sucking sap and indirect damage by secreting honeydew, which encourages sooty mold growth. This can interfere with photosynthesis and weaken the plant. Aphids can also transmit viral diseases. Whiteflies: Two species, the silverleaf whitefly and the bandedwinged whitefly, are particularly troublesome. They not only suck sap from the underside of leaves, causing yellowing and leaf drop, but their honeydew excretion promotes sooty mold and they can transmit several plant viruses. Thrips: While thrips can chew on plants, their primary damage to cotton is through sucking. They attack the cotton plant during its seedling stage, which can stunt growth and reduce vigor. Thrips are also capable of transmitting the Cotton Bud disease. Spider Mites: These are not insects but arachnids. Spider mites, such as the two-spotted spider mite, suck cell contents from the leaves, leading to speckled discoloration and potentially significant leaf loss if infestations are severe. Leafhoppers: Including various species, leafhoppers can cause direct damage through feeding, which results in leaf curling and stunted growth. They can also be vectors for plant diseases. Mealybugs: These pests are less common but can be problematic, especially in clustered planting conditions. They suck sap and secrete honeydew, which leads to sooty mold. Mealybugs can also spread viruses. Stink Bugs: Although primarily known for their chewing mouthparts, certain stink bugs can cause damage similar to sucking pests by injecting saliva into the plant and sucking out nutrients, leading to boll damage and stained lint. Management Strategies: Cultural Controls: This includes practices such as crop rotation, using resistant varieties, and managing planting and harvesting times to avoid peak pest populations. Biological Controls: Beneficial insects like lady beetles, lacewings, and predatory mites can naturally control sucking pest populations. Parasitic wasps also play a role in controlling aphid and whitefly populations. Chemical Controls: Insecticides may be used but should be chosen carefully to minimize resistance development and preserve beneficial insects. Systemic insecticides can be particularly effective against sucking pests. Integrated Pest Management (IPM): Combining multiple control strategies based on monitoring and thresholds to apply the most effective and environmentally sensitive approach. Effective management of sucking pests in cotton requires a thorough understanding of the pest species present, their life cycles, and the ecological balance of the field environment.
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