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排序方式: 共有124条查询结果,搜索用时 31 毫秒
1.
Christopher Cueto Colleen Donoghue Kimberly Bolduc Prof. Todd Emrick 《Chemistry (Weinheim an der Bergstrasse, Germany)》2022,28(30):e202200409
Traditional hot injection methods for the preparation of cesium lead halide perovskite nanocrystals (CsPbX3 PNCs, where X=Cl, Br, or I) rely on small molecule surfactants to produce PNCs with cube, plate, or rod-like morphologies. Here, we describe a new method whereby zwitterionic block copolymers are employed as macromolecular ligands in PNC synthesis, affording PNCs with excellent colloidal stability, high photoluminescence quantum yield, and in some cases distinctly non-cubic shapes. The block copolymers used in this study – composed of a poly(n-butyl methacrylate) hydrophobic block and zwitterionic methacrylate hydrophilic blocks – dissolve in useful solvents for PNC growth despite containing large mole percentages of zwitterionic groups. PNCs prepared with block copolymer ligands were found to disperse and retain their fluorescence in a range of polar organic solvents and were amenable to direct integration into optically transparent nanocomposite thin films with high PNC content. 相似文献
2.
Bruno Oyallon Marie Brachet-Botineau Cdric Log Thomas Robert Stphane Bach Sajida Ibrahim William Raoul Ccile Croix Pascal Berthelot Jean Guillon Noël Pinaud Fabrice Gouilleux Marie-Claude Viaud-Massuard Caroline Denevault-Sabourin 《Molecules (Basel, Switzerland)》2021,26(4)
Proviral integration site for Moloney murine leukemia virus (Pim)-1/2 kinase overexpression has been identified in a variety of hematologic (e.g., multiple myeloma or acute myeloid leukemia (AML)) and solid (e.g., colorectal carcinoma) tumors, playing a key role in cancer progression, metastasis, and drug resistance, and is linked to poor prognosis. These kinases are thus considered interesting targets in oncology. We report herein the design, synthesis, structure–activity relationships (SAR) and in vitro evaluations of new quinoxaline derivatives, acting as dual Pim1/2 inhibitors. Two lead compounds (5c and 5e) were then identified, as potent submicromolar Pim-1 and Pim-2 inhibitors. These molecules were also able to inhibit the growth of the two human cell lines, MV4-11 (AML) and HCT-116 (colorectal carcinoma), expressing high endogenous levels of Pim-1/2 kinases. 相似文献
3.
Sabine Martin-Seigle Marie-Claude Pélissier Paul J.T. Filippi 《Flow, Turbulence and Combustion》1998,61(1-4):71-83
This paper deals with acoustic radiation by a thin elastic shell, closed by two perfectly rigid discs, immersed in water and
filled with air. The system is driven by an internal acoustic source. The shell has a length L, is clamped along one of its
boundaries and is freely supported along the other boundary.
Using the infinite domain Green's function, the radiated acoustic pressure is modeled by a hybrid layer potential (linear
combination with nonreal coefficient of a simple layer and a double layer). Using Green's tensor of the in vacuo shell operator,
the shell displacement is expressed as the sum of the field generated by the acoustic pressures and that due to boundary sources.
Finally, the Green's function of the interior Neumann problem is used to express the acoustic pressure inside the shell in
terms of the acoustic source and shell normal displacement: this representation fails for any frequency equal to one of the
resonance frequencies of the shell interior.
To overcome this, a light fluid approximation, which is allowed because the inner fluid is a gas, is adopted. Around each
resonance frequency, an inner approximation is defined which matches the classical outer approximation.
This revised version was published online in July 2006 with corrections to the Cover Date. 相似文献
4.
Solder pastes used in surface mount soldering techniques (SMT) are very complex suspensions containing high volumes of metallic powder in a carrier fluid. The rheological complexity results largely from the carrier fluid itself, which is a suspension of colloidal particles. In this work, we have characterized the rheological properties of a typical carrier fluid and its solder paste containing 64 vol.% metallic powder. A six-blade vane geometry was used to avoid wall slip and sample fracture. All measurements were carried out following pre-shearing and rest time in order to obtain reproducible results. Steady shear experiments showed that the solder paste was highly shear-thinning and thixotropic. In oscillatory shear, the linear viscoelastic domain was found to be very narrow for both the suspending fluid and the paste. Frequency sweep tests in the linear domain revealed a gel-like structure with a nearly constant G′ for the suspending fluid and a slightly increasing G′ for the solder paste. From creep experiments, a yield stress of about 40 Pa was determined for the suspending fluid at temperatures between 25 and 40°C, and of 100 Pa at 4°C. A much larger yield stress, 480 Pa, was determined for the solder paste at 25°C. 相似文献
5.
Marie-Claude Viallon 《国际流体数值方法杂志》2020,92(5):391-421
The heat equation is solved by using a finite volume discretization in a domain that consists of a two-dimensional central node and several one-dimensional outgoing branches. Several interface connection options to match the submodels set on the node and on the branches, with or without continuity, are looked at. For each of them, a monolithic scheme is defined, and existence and uniqueness of the solution is proved. New schemes are deduced, which are obtained through domain decomposition methods in the form of interface systems, with one or two unknowns per interface. A comparative systematic study is carried out from an algebraic and numerical point of view according to the interface conditions: Dirichlet, Neumann, or Robin. An efficient diagonal preconditioning is proposed. 相似文献
6.
Marie-Claude Arnaud 《Regular and Chaotic Dynamics》2013,18(6):697-702
We prove that the set of periodic points of a generic C 1-billiard table is dense in the phase space. 相似文献
7.
Marie-Claude Druguet 《Shock Waves》2010,20(3):251-261
This paper presents the methodology and the physical models implemented in our computational code to predict the flow field
over a Mars Sample Return Orbiter entering a Mars-like atmosphere. Because no validation against flight data or experiments
can be done at present, the results obtained here are compared to other computed results for verification purpose. The predicted
flow fields show that the chemical species CO and CO2, that are highly radiative species, are present in a large amount and at high temperature in the shock layer and in the wake
of the flow past the orbiter. 相似文献
8.
Sarah Djabarouti Pierre Duffau Fabien Xuereb Estibaliz Lazaro Carine Greib Jean-Baptiste Gordien Olivier Caubet Marie-Claude Saux Jean-François Viallard Jean-Luc Pellegrin Dominique Breilh 《Chromatographia》2009,70(5-6):939-945
Liquid chromatography coupled with mass spectrometry for the determination of total and unbound mycophenolic acid and its major metabolite in human plasma has been developed. Sample preparations were based on a fully automated solid-phase extraction process and ultrafiltration. Mass spectrometric data were acquired in a single-ion monitoring method. The analytes and nevirapine (internal standard) were well separated in an isocratic mode over 8 min. Validation study exhibited excellent linearity, with intra- and inter-day precision and accuracy of less than 12%. The assay was successfully applied to the pharmacokinetic study of mycophenolic acid in patients with autoimmune diseases. 相似文献
9.
10.
The effect of flow history on the linear and non-linear viscoelastic properties of non-polar polymer nanocomposites (PNCs)
has been investigated by means of a suitable model system based on a Newtonian matrix. The structural recovery of this model
suspension after cessation of different pre-shear rates was monitored by measuring its linear viscoelastic properties while
its structural evolution under shear flow was followed by using stepwise changes in shear rate including flow reversal measurements.
To assess the kinetics of the structural evolution at rest and under flow, empirical relations of stretched exponential form
were used. It is shown that for different pre-shear rates, different equilibrium structures were reached at rest but with
a similar kinetics of recovery. As a result, the low frequency behaviour was typical of solid-like or weak gel material, strongly
dependent on the flow history. After any given shear rate under steady state, only one reversible equilibrium structure was
reached after a kinetics that was dependent on the pre-shear history. Finally, typical flow reversal responses as observed
for PNCs are reported and interpreted in light of the microstructure evolution under flow.
This paper was presented at the Annual Meeting of the European Society of Rheology, Hersonisos, Greece April 2006. 相似文献