scholarly journals In situ tether formation from amines and alcohols enabling highly selective Tsuji–Trost allylation and olefin functionalization

2017 ◽  
Vol 8 (1) ◽  
pp. 32-39 ◽  
Author(s):  
Ugo Orcel ◽  
Jérôme Waser
Keyword(s):  
New Generation

A new generation of methods based on in situ tether formation greatly enhances the efficiency and selectivity of olefin functionalization.

A New Generation of In Situ ${\rm MgB}_{2}$ Wires With Improved $J_{\rm c}$ and $B_{\rm irr}$ Values Obtained by Cold Densification (CHPD)

2011 ◽  
Vol 21 (3) ◽  
pp. 2649-2654 ◽  
Author(s):  
René Flukiger ◽  
Md. Shahriar Al Hossain ◽  
Carmine Senatore ◽  
Florin Buta ◽  
Matt Rindfleisch
Keyword(s):  
New Generation

scholarly journals Enabling Lab-in-Gap Transmission Electron Microscopy at Atomic Resolution

2016 ◽  
Vol 24 (1) ◽  
pp. 24-29 ◽  
Author(s):  
Xiao Feng Zhang
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Structural Changes ◽  
Pole Piece ◽  
Large Area ◽  
Electrical Fields ◽  
Transmission Electron ◽  
Environmental Tem ◽  
New Generation

Abstract: Hitachi Lab-in-Gap transmission electron microscopy (TEM) technologies are introduced. The term Lab-in-Gap refers to a special function that allows in situ and in operando TEM studies of materials in gas or liquid environments while stimulations, such as thermal or electrical fields, are applied to the specimen sitting in the pole piece gap in a TEM system. Physical or chemical process can be activated and imaged in real time using TEM or other imaging modes. The new generation environmental TEM platform with large pole piece gap and advanced aberration correctors opens wide possibilities for integrating multiple stimuli sources as well as large-area, sub-Å resolution live imaging for dynamic structural changes.

scholarly journals Eco-friendly Mn-doped CsPbCl3 Perovskite Nanocrystals Glass with Blue-red Emitting for Indoor Plant Lighting

2020 ◽  
Author(s):  
Ya Chen ◽  
Linli Shen ◽  
Jianming Liu ◽  
Xiaojuan Liang ◽  
Weidong Xiang ◽  
...  
Keyword(s):  
Thermal Quenching ◽  
Light Emitting ◽  
Perovskite Nanocrystals ◽  
Plant Cultivation ◽  
Light Requirements ◽  
Fluorescent Materials ◽  
In Situ Crystallization ◽  
New Generation ◽  
Mn Doped

Abstract Mn-doped CsPbCl3 perovskite nanocrystals (PeNCs) glass was prepared by melt-quenching and in-situ crystallization. Under the protection of robust glass, PeNCs exhibit excellent moisture resistance and thermal stability. Due to the combination effect of thermal quenching and energy transfer of exciton-to-Mn2+, the emission intensity of Mn shows an abnormal temperature-dependence with the temperature increasing from 80 to 300 K, which can be explored further in the application of temperature sensor. Interestingly, by matching with ultraviolet chips, all-inorganic blue-red emitting conversion device consisting of PeNCs glasses were prepared for light-emitting diodes (LEDs), which can meet the light requirements of plant growth. The cultivation results indicated that growth of cabbages using PeNCs plant cultivation LEDs were greater than those cultivated using commercial w-LEDs. Therefore, Mn-doped CsPbCl3 PeNCs can be used as a new-generation of solid fluorescent materials in the field of indoor plant cultivation LEDs.

A Genetic Basis for Design of Biomaterials for In Situ Tissue Regeneration

2008 ◽  
Vol 377 ◽  
pp. 151-166 ◽  
Author(s):  
Larry L. Hench ◽  
Julia M. Polak
Keyword(s):  
Tissue Engineering ◽  
Tissue Regeneration ◽  
Genetic Basis ◽  
First Generation ◽  
Scar Tissue ◽  
Biologically Active ◽  
Bioactive Glasses ◽  
Osteoprogenitor Cells ◽  
New Generation

Historically the function of biomaterials has been to replace diseased, damaged and aged tissues. First generation biomaterials, including bio ceramics, were selected to be as inert as possible in order to minimize the thickness of interfacial scar tissue. Bioactive glasses provided an alternative from the 1970’s onward; second generation bioactive bonding of implants with tissues and no interfacial scar tissue. This chapter reviews the discovery that controlled release of biologically active Ca and Si ions from bioactive glasses leads to the up-regulation and activation of seven families of genes in osteoprogenitor cells that give rise to rapid bone regeneration. This finding offers the possibility of creating a new generation of gene activating bioceramics designed specially for tissue engineering and in situ regeneration of tissues.

In situ ripening stages monitoring of Lamuyo pepper using a new‐generation near‐infrared spectroscopy sensor

2020 ◽  
Vol 100 (5) ◽  
pp. 1931-1939 ◽  
Author(s):  
María‐Teresa Sánchez ◽  
Carlos Pintado ◽  
María‐José Haba ◽  
Irina Torres ◽  
Manuel García ◽  
...  
Keyword(s):  
Infrared Spectroscopy ◽  
Near Infrared Spectroscopy ◽  
Near Infrared ◽  
Ripening Stages ◽  
New Generation

Microstructure Characterization of In Situ Ti-TiB Metal Matrix Composites Prepared by Powder Metallurgy Process

2018 ◽  
Vol 770 ◽  
pp. 25-30 ◽  
Author(s):  
Harshpreet Singh ◽  
Muhammad Dilawer Hayat ◽  
Raj Das ◽  
Xin Gang Wang ◽  
Peng Cao
Keyword(s):  
Metal Matrix Composites ◽  
Metal Matrix ◽  
High Strength ◽  
Matrix Composites ◽  
Vacuum Sintering ◽  
Powder Metallurgy Process ◽  
Mean Size ◽  
Evolution Of Microstructure ◽  
New Generation

Metal matrix composites (MMCs) are the new generation materials that combine both the metallic properties (ductility and toughness) and ceramic characteristics (high strength and modulus), leading to higher strength in shear and compression, at higher service temperatures. Titanium matrix composites possess light weight, high strength and good corrosion resistance and are used as structural materials in automobiles and aerospace industries. In the present study, in situ Ti-TiB composites were fabricated by reinforcing (2, 5, 10 and 20 wt. %) TiB2 powder (mean size <10 microns) into titanium powder (mean particle size ~26.58 μm) and subsequently consolidated by vacuum sintering at 1300 °C for 3 h. X-ray diffraction, scanning electron microscopy (SEM) and density measurements were carried out to characterize the prepared composites. The results showed that all compositions led to high density composites, and the hardness of the composites increased with an increase in the amount of reinforcement. The mechanism of vacuum sintering is yet to be understood in the consolidation of composites and the detailed evolution of microstructure needs to be analysed.

Potential of Ultra-High Resolution and Low Voltage Sem for Dynamic Experiments

1995 ◽  
Vol 404 ◽  
Author(s):  
E D Boyes
Keyword(s):  
Low Voltage ◽  
High Vacuum ◽  
High Sensitivity ◽  
Ceramic Substrate ◽  
Particle Migration ◽  
In Situ Experiments ◽  
Dynamic Experiments ◽  
Resolution Imaging ◽  
New Generation

AbstractA new generation of ultrahigh resolution scanning electron microscope (UHRSEM) is designed to explore the potential for higher resolution imaging and chemical microanalysis from more representative bulk samples. A <0.5nm probe at 30kV and <2.5nm at 1kV have been integrated with high sensitivity energy dispersive x-ray spectrometry (EDX) [1] and a high vacuum (<3×10−8mbar) heating stage (to >1000°C). The sensitivity of surface imaging is generally enhanced at low beam energies. With low voltages and digitally integrated fast scan techniques, conductive coating of an electrically non-conducting sample, such as a ceramic substrate, is no longer a pre-requisite for SEM, and this opens up new possibilities for minimally invasive dynamic in-situ experiments. This paper focuses on metal particle migration and sintering on a ceramic substrate.

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