scholarly journals Nanostructured bulk Si for thermoelectrics synthesized by surface diffusion/sintering doping

RSC Advances ◽  
2019 ◽  
Vol 9 (27) ◽  
pp. 15496-15501
Author(s):  
Sora-at Tanusilp ◽  
Naoki Sadayori ◽  
Ken Kurosaki
Keyword(s):  
Surface Diffusion ◽  
Bulk Silicon ◽  
Silicon Bulk ◽  
Low Toxicity ◽  
Te Material ◽  
Diffusion Sintering

Nanostructured bulk silicon (bulk nano-Si) has attracted attention as an advanced thermoelectric (TE) material due to its abundance and low toxicity.

Excellent ZT achieved in Cu1.8S thermoelectric alloys through introducing rare-earth trichlorides

2018 ◽  
Vol 6 (29) ◽  
pp. 14440-14448 ◽  
Author(s):  
Zhen-Hua Ge ◽  
Yi-Xin Zhang ◽  
Dongsheng Song ◽  
Xiaoyu Chong ◽  
Peng Qin ◽  
...  
Keyword(s):  
Rare Earth ◽  
Environmental Friendliness ◽  
Low Toxicity ◽  
Te Material ◽  
P Type

Digenite (Cu1.8S) as a potential p-type thermoelectric (TE) material has attracted extensive attention due to its environmental-friendliness and low toxicity.

Fragmentation of two-dimensional mass fractals by surface-diffusion sintering

1997 ◽  
Vol 56 (9) ◽  
pp. 5321-5327 ◽  
Author(s):  
Romain Thouy ◽  
Nathalie Olivi-Tran ◽  
Rémi Jullien
Keyword(s):  
Surface Diffusion ◽  
Two Dimensional ◽  
Diffusion Sintering

A theory of contamination in electron microscopes by surface diffusion

1978 ◽  
Vol 36 (1) ◽  
pp. 116-117
Author(s):  
J.T. Fourie
Keyword(s):  
Electron Beam ◽  
Surface Diffusion ◽  
High Vacuum ◽  
Ultra High Vacuum ◽  
Physical Parameters ◽  
Carbon Compounds ◽  
Hydrocarbon Molecules ◽  
Electron Microscopes ◽  
Primary Electrons ◽  
Long Chain

Contamination in electron microscopes can be a serious problem in STEM or in situations where a number of high resolution micrographs are required of the same area in TEM. In modern instruments the environment around the specimen can be made free of the hydrocarbon molecules, which are responsible for contamination, by means of either ultra-high vacuum or cryo-pumping techniques. However, these techniques are not effective against hydrocarbon molecules adsorbed on the specimen surface before or during its introduction into the microscope. The present paper is concerned with a theory of how certain physical parameters can influence the surface diffusion of these adsorbed molecules into the electron beam where they are deposited in the form of long chain carbon compounds by interaction with the primary electrons.

Avaliação da eficácia da terapia de espelho na Síndrome de Pusher e da heminegligência em pacientes pós-acidente vascular encefálico

2017 ◽  
Vol 18 (3) ◽  
pp. 362
Author(s):  
Ana Clara Medeiros Freitas ◽  
Luana Augusta Pimenta Bezerra ◽  
Paloma Cristina Alves De Oliveira ◽  
Lucivânia Medeiros Freitas ◽  
Sayonara Rodrigues Da Silva ◽  
...  
Keyword(s):  
Te Material ◽  
Sobre Todo

Introdução: Em pacientes com Acidente Vascular Cerebral (AVC) agudo, que experimentam déficits acentuados de equilíbrio, pode-se suspeitar da Síndrome de Pusher. Objetivo: Analisar eficácia do tratamento da Síndrome de Pusher (SP) e heminegligência através da Terapia de Espelho (TE). Material e métodos: Relata-se o caso de um paciente com 6 meses pós-AVC, 55 anos, do sexo masculino, com heminegligência e SP associadas ao quadro clínico de hemiplegia proporcionada à esquerda. O paciente foi avaliado pelas escalas: Escala de Equilíbrio de Berg (EEB), Escala de Fulg-Meyer (FM), Medida de Independência Funcional (MIF), Contraversive Pushing Scale (CPS) e teste do desenho para heminegligência (TDH). Foi realizada a TE de modo que todo o hemicorpo saudável ficava refletido na imagem. Foram realizadas 15 sessões de exercícios, com 50 minutos de duração. Resultados: Observa-se uma melhora considerável nas pontuações da FM - função sensorial e na MIF. A melhora da heminegligência e da SP também foi observada pelos testes aplicados. As pontuações da EEB e FM, seção membro superior e membro inferior obtiveram diferenças mínimas na comparação antes e após o tratamento. Conclusão: A TE aplicada sobre todo o hemicorpo afetado foi capaz de promover melhora na heminegligência e SP de paciente agudo pós-AVE.Palavras-chave: acidente vascular cerebral, equilíbrio postural, fisioterapia.

Blue Sapphire with Partial Red Surface Diffusion

2020 ◽  
Vol 37 (1) ◽  
pp. 23-24
Author(s):  
Bear Williams ◽  
Cara Williams ◽  
Charles I. Carmona
Keyword(s):  
Surface Diffusion

Challenges of Aircraft and Drone Spray Applications

2020 ◽  
Vol 31 (2) ◽  
pp. 83-88 ◽  
Author(s):  
Fernando K. Carvalho ◽  
Rodolfo G. Chechetto ◽  
Alisson A. B. Mota ◽  
Ulisses R. Antuniassi
Keyword(s):  
Smallholder Farmers ◽  
Crop Protection ◽  
Crop Canopy ◽  
Target Species ◽  
Buffer Zones ◽  
Correct Dose ◽  
Knapsack Sprayer ◽  
Water Courses ◽  
Low Toxicity ◽  
Heavy Loads

Crop protection on major crops is now required to follow the principles of integrated pest management so the timing and accuracy of any application of a pesticide or biopesticide has to be more precise to minimize adverse effects on non-target species. The development of UAVs (unmanned aerial vehicles) provides a means of providing a more targeted application of the correct dose, especially by using formulations that are more persistent, thus minimizing loss of spray in areas subject to rain. Avoiding use of too high a dosage allows greater survival of natural enemies and reduces the selection pressure for pests becoming resistant to specific modes of action. The downward flow of air from a UAV should also provide better distribution and impaction of droplets within a crop canopy, reduce soil impaction caused by taking heavy loads of spray applied with 200 l ha–1 of water, and allow treatments when fields are too wet to access with ground equipment. In Asia, many smallholder farmers are using a drone in preference to using a knapsack sprayer. According to Matthews, it has been shown that ULV spraying can be effective, but it needs a narrow droplet spectrum with the droplets remaining stable and not shrinking to become too small. Formulation research can reduce the volatility of the spray, hence the success of oil-based sprays. However, instead of petroleum-based oils, there is a chance to develop vegetable oil carriers with micro-sized particle suspensions to deliver low toxicity pesticides in droplets that can be deposited within the crop and not drift beyond the crop boundary. Oil deposits will be less prone to loss after rain so less should be lost in neighbouring ditches and water courses, especially as rainfall patterns are forecast to change. More studies are needed to evaluate the swath for deposition, buffer zones, formulation, nozzle selection, to guide future specific legislation for UAV applications.

Cellular Uptake and Magneto-Hyperthermia Induced Cytotoxicity using Photoluminescent Fe3O4 Nanoparticle/Si Quantum Dot Hybrids

2020 ◽  
Author(s):  
Morteza Javadi ◽  
Van A. Ortega ◽  
Alyxandra Thiessen ◽  
Maryam Aghajamali ◽  
Muhammad Amirul Islam ◽  
...  
Keyword(s):  
Radio Frequency ◽  
Biomedical Applications ◽  
Short Term ◽  
Water Dispersible ◽  
Optical Responses ◽  
Si Quantum Dot ◽  
Real World Applications ◽  
Potential Benefits ◽  
Low Toxicity ◽  
Si Quantum Dots

<p>The design and fabrication of Si-based multi-functional nanomaterials for biological and biomedical applications is an active area of research. The potential benefits of using Si-based nanomaterials are not only due to their size/surface-dependent optical responses but also the high biocompatibility and low-toxicity of silicon itself. Combining these characteristics with the magnetic properties of Fe<sub>3</sub>O<sub>4</sub> nanoparticles (NPs) multiplies the options available for real-world applications. In the current study, biocompatible magnetofluorescent nano-hybrids have been prepared by covalent linking of Si quantum dots to water-dispersible Fe<sub>3</sub>O<sub>4</sub> NPs <i>via</i> dicyclohexylcarbodiimide (DCC) coupling. We explore some of the properties of these magnetofluorescent nano-hybrids as well as evaluate uptake, the potential for cellular toxicity, and the induction of acute cellular oxidative stress in a mast cells-like cell line (RBL-2H3) by heat induction through short-term radio frequency modulation (10 min @ 156 kHz, 500 A). We found that the NPs were internalized readily by the cells and also penetrated the nuclear membrane. Radio frequency activated nano-hybrids also had significantly increased cell death where > 50% of the RBL-2H3 cells were found to be in an apoptotic or necrotic state, and that this was attributable to increased triggering of oxidative cell stress mechanisms. </p>

Case Study: Combined Dynamic Laser Stimulation and Static Emission Microscopy Techniques Applied to Scan Test Failure on Mixed Mode Device

2012 ◽  
Author(s):  
Magdalena Sienkiewicz ◽  
Philippe Rousseille
Keyword(s):  
Mixed Mode ◽  
Laser Stimulation ◽  
Scan Test ◽  
Silicon Bulk ◽  
Defect Localization ◽  
Emission Microscopy ◽  
Microscopy Techniques ◽  
Test Failure

Abstract This paper presents a case study on scan test reject in a mixed mode IC. It focuses on the smart use of combined mature FA techniques, such as Soft Defect Localization (SDL) and emission microscopy (EMMI), to localize a random scan test anomaly at the silicon bulk level.

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