There is, I think, something ethereal about i —the square root of minus one. I remember first hearing about it at school. It seemed an odd beast at that time—an intruder hovering on the edge of reality.

Usually familiarity dulls this sense of the bizarre, but in the case of i it was the reverse: over the years the sense of its surreal nature intensified. It seemed that it was impossible to write mathematics that described the real world in …

I and i

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

비만아 부모의 돌봄 경험: q 방법론

Giant and isotropic magnetoresistance as huge as −53% was observed in magnetic manganese oxide La0.72Ca0.25MnOz films with an intrinsic antiferromagnetic spin structure. We ascribe this magnetoresistance to spin‐dependent electron scattering due to spin canting of the manganese oxide.

31p-S-4 Giant Magnetoresistance in Magnetic Manganese Oxide with Intrinsic Antiferromagnetic Spin Structure

Nanomaterials (NMs) are gaining significance in technological applications due to their tunable chemical, physical, and mechanical properties and enhanced performance when compared with their bulkier counterparts. This review presents a summary of the general types of NMs and provides an overview of the various synthesis methods of nanoparticles (NPs) and their functionalization via covalent or noncovalent interactions using different methods. It highlights the techniques used for the characterization of NPs and discusses their physical and chemical properties. Due to their unique properties, NMs have several applications and have become part of our daily lives. As a result, nanotoxicity research is gaining attention since some NPs are not easily degraded by the environment. Thus, this review also highlights research efforts into the fate, behavior, and toxicity of different classes of NMs in the environment.

Nanomaterials: Classification, properties, and environmental toxicities

Structural, microstructural and dielectric behavior of sol–gel grown nanostructured Y0.95Zr0.05MnO3

https://iopscience.iop.org/article/10.1088/2053-1591/aab5ec/pdf

Size effects on electrical properties of chemically grown zinc oxide nanoparticles

Size is the key factor of nanostructured materials, since all the structural, transport, electrical, magnetic and other physical properties can be tuned by this factor of materials. Only the condition is to choose appropriate inexpensive scale-processing method for material synthesis which offers good control over the stoichiometry, morphology and particle size distribution. Present communication deals with the studies on the sol–gel grown Y0.95Ca0.05MnO3 (YCMO) nanostructured compounds for their size-induced tuning of dielectric behavior. Structural studies reveal the single phasic nature with improved crystallite size with sintering temperature. Dielectric constant (real and imaginary) is found to increase with temperature and crystallite size/sintering temperature. High dielectric loss has been observed in the present system. Size dependent activation energy (Ea), obtained from modulus measurement, showing the increase in Ea with crystallite size. The variation in various dielectric parameters and Ea has been discussed in the light of crystallite size, crystallite boundaries, oxygen vacancies and charge carrier hopping.

/pdf/size-induced-tuning-of-dielectric-behavior-in-nanostructured-ydgnai3py6.pdf

Size induced tuning of dielectric behavior in nanostructured Y0.95Ca0.05MnO3 compounds

Present study reports the device characteristics of epitaxially grown La0.6Pr0.2Sr0.2MnO3/SrNb0.002Ti0.998O3 manganite before and after swift heavy ion irradiation at various ion fluences. The modification in the structural, morphological and electrical transport properties of La0.6Pr0.2Sr0.2MnO3/SrNb0.002Ti0.998O3 have been explained based on defect formation and interface annealing effect. Various charge transport models are used to fit the I–V characteristics and the present study suggests that thermionic emission mechanism governs the transport in the pristine and irradiated devices. Irradiation induced variation in structural strain, crystallinity and surface roughness are responsible for the change in transport behavior in the devices.

Nikesh A. Shah

Papers

Structural, microstructural and dielectric behavior of sol–gel grown nanostructured Y0.95Zr0.05MnO3

Size effects on electrical properties of chemically grown zinc oxide nanoparticles

Size induced tuning of dielectric behavior in nanostructured Y0.95Ca0.05MnO3 compounds

Modifications in device characteristics of La 0.6 Pr 0.2 Sr 0.2 MnO 3 /SrNb 0.002 Ti 0.998 O 3 manganites by swift heavy ion irradiation

Defect dynamics in the resistive switching characteristics of Y0.95Sr0.05MnO3 films induced by electronic excitations