Tailored design of CoxMn1−xFe2O4 nanoferrites: a new route for dual control of size and magnetic properties

2014 ◽  
Vol 2 (29) ◽  
pp. 5818-5828 ◽  
Author(s):  
Carlos Fernandes ◽  
Clara Pereira ◽  
María Paz Fernández-García ◽  
André M. Pereira ◽  
Alexandra Guedes ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Material Properties ◽  
Dual Control ◽  
One Pot ◽  
Precise Control ◽  
Alkaline Agent ◽  
Tailored Design ◽  
Selection Of

CoxMn1-xFe2O4 nanoferrites with tailored size and magnetism were produced by one-pot coprecipitation. Selection of Co(II):Mn(II) ratio and alkaline agent allows precise control of the material properties.

Divergent synthesis of CF3-substituted polycyclic skeletons based on control of activation site of acid catalysts

2018 ◽  
Vol 54 (50) ◽  
pp. 6927-6930 ◽  
Author(s):  
Kazuma Yokoo ◽  
Keiji Mori
Keyword(s):  
Acid Catalysts ◽  
Precise Control ◽  
Selection Of ◽  
Activation Site

We report a divergent synthesis of CF3-substituted fused skeletons based on precise control of the activation site through the selection of acid catalysts.

scholarly journals Precise control of Jeff=12 magnetic properties in Sr2IrO4 epitaxial thin films by variation of strain and thin film thickness

2020 ◽  
Vol 102 (21) ◽  
Author(s):  
Stephan Geprägs ◽  
Björn Erik Skovdal ◽  
Monika Scheufele ◽  
Matthias Opel ◽  
Didier Wermeille ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Magnetic Properties ◽  
Film Thickness ◽  
Epitaxial Thin Films ◽  
Thin Film Thickness ◽  
Precise Control

A new representation for a robot grasping quality measure

Robotica ◽  
1995 ◽  
Vol 13 (3) ◽  
pp. 287-295 ◽  
Author(s):  
Venugopal K. Varma ◽  
Uri Tasch
Keyword(s):  
Objective Function ◽  
Material Properties ◽  
Graphical Representation ◽  
Contact Forces ◽  
Geometric Constraints ◽  
Objective Functions ◽  
Finger Force ◽  
Finger Forces ◽  
Robot Grasping ◽  
Selection Of

SummaryWhen an object is held by a multi-fingered hand, the values of the contact forces can be multivalued. An objective function, when used in conjunction with the frictional and geometric constraints of the grasp, can however, give a unique set of finger force values. The selection of the objective function in determining the finger forces is dependent on the type of grasp required, the material properties of the object, and the limitations of the röbot fingers. In this paper several optimization functions are studied and their merits highlighted. The paper introduces a graphical representation of the finger force values and the objective functions that enable one to select and compare various grasping configurations. The impending motion of the object at different torque and finger force values are determined by observing the normalized coefficient of friction plots.

Servo respirator constructed from a positive-pressure ventilator

1976 ◽  
Vol 41 (2) ◽  
pp. 252-255 ◽  
Author(s):  
J. E. Remmers ◽  
H. Gautier
Keyword(s):  
Negative Feedback ◽  
Differential Amplifier ◽  
Positive Pressure ◽  
Precise Control ◽  
Pressure Signal ◽  
Response Characteristics ◽  
Tracheal Pressure ◽  
Selection Of

We have constructed an electronically controlled respirator from three commercially available components: a positive-pressure ventilator, a recorder pen motor, and a differential amplifier. Using negative feedback derived from a tracheal pressure signal, the instrument functions as a servo respirator which provides precise control of tracheal pressure. The system's power and response characteristics are well suited for ventilation of anesthetized cats and dogs. The servo respirator can be used as an externallycontrolled respiratory pump which provides flexibility in selection of the parameters of the ventilatory cycle. Alternatively, it can function as a “demand” respirator which generates transthoracic pressure proportional to efferent respiratory discharge.

scholarly journals Optimization of Magnetic Properties of Magnetic Microwires by Post-Processing

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 1006
Author(s):  
Valentina Zhukova ◽  
Paula Corte-Leon ◽  
Lorena González-Legarreta ◽  
Ahmed Talaat ◽  
Juan Maria Blanco ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Chemical Composition ◽  
Hysteresis Loops ◽  
Structural Features ◽  
Post Processing ◽  
Soft Magnetic ◽  
Magnetic Microwires ◽  
Prepared State ◽  
Induced Magnetic Anisotropy ◽  
Selection Of

The influence of post-processing conditions on the magnetic properties of amorphous and nanocrystalline microwires has been thoroughly analyzed, paying attention to the influence of magnetoelastic, induced and magnetocrystalline anisotropies on the hysteresis loops of Fe-, Ni-, and Co-rich microwires. We showed that magnetic properties of glass-coated microwires can be tuned by the selection of appropriate chemical composition and geometry in as-prepared state or further considerably modified by appropriate post-processing, which consists of either annealing or glass-coated removal. Furthermore, stress-annealing or Joule heating can further effectively modify the magnetic properties of amorphous magnetic microwires owing to induced magnetic anisotropy. Devitrification of microwires can be useful for either magnetic softening or magnetic hardening of the microwires. Depending on the chemical composition of the metallic nucleus and on structural features (grain size, precipitating phases), nanocrystalline microwires can exhibit either soft magnetic properties or semi-hard magnetic properties. We demonstrated that the microwires with coercivities from 1 A/m to 40 kA/m can be prepared.

scholarly journals Are trade-offs between flexibility and efficiency in systematic conservation planning avoidable ?

2019 ◽  
Author(s):  
Sabrine Drira ◽  
Frida Ben Rais Lasram ◽  
Tarek Hattab ◽  
Yunne Jai Shin ◽  
Amel Ben Rejeb Jenhani ◽  
...  
Keyword(s):  
Conservation Planning ◽  
Large Body ◽  
Efficient Solutions ◽  
Reserve Selection ◽  
Systematic Conservation Planning ◽  
Distribution Models ◽  
Precise Control ◽  
Trade Offs ◽  
Selection Framework ◽  
Selection Of

AbstractSpecies distribution models (SDMs) have been proposed as a way to provide robust inference about species-specific sites suitabilities, and have been increasingly used in systematic conservation planning (SCP) applications. However, despite the fact that the use of SDMs in SCP may raise some potential issues, conservation studies have overlooked to assess the implications of SDMs uncertainties. The integration of these uncertainties in conservation solutions requires the development of a reserve-selection approach based on a suitable optimization algorithm. A large body of research has shown that exact optimization algorithms give very precise control over the gap to optimality of conservation solutions. However, their major shortcoming is that they generate a single binary and indivisible solution. Therefore, they provide no flexibility in the implementation of conservation solutions by stakeholders. On the other hand, heuristic decision-support systems provide large amounts of sub-optimal solutions, and therefore more flexibility. This flexibility arises from the availability of many alternative and sub-optimal conservation solutions. The two principles of efficiency and flexibility are implicitly linked in conservation applications, with the most mathematically efficient solutions being inflexible and the flexible solutions provided by heuristics suffering sub-optimality. In order to avoid the trade-offs between flexibility and efficiency in systematic conservation planning, we propose in this paper a new reserve-selection framework based on mathematical programming optimization combined with a post-selection of SDM outputs. This approach leads to a reserve-selection framework that might provide flexibility while simultaneously addressing efficiency and representativeness of conservation solutions and the adequacy of conservation targets. To exemplify the approach we a nalyzed an experimental design crossing pre- and post-selection of SDM outputs versus heuristics and exact mathematical optimizations. We used the Mediterranean Sea as a biogeographical template for our analyses, integrating the outputs of 8 SDM techniques for 438 fishes species.

Synthesis, Magnetic Property and Assembly Studies of Two Cu(II) Complexes Based on o-phenanthroline and Phosphate

2021 ◽  
Author(s):  
Fang Fang Jian ◽  
E Liu ◽  
Zesen Jin ◽  
Fangfang Jian
Keyword(s):  
Magnetic Properties ◽  
Phosphoric Acid ◽  
Copper Complexes ◽  
Raw Materials ◽  
Great Influence ◽  
Crystal Structure Analysis ◽  
Supramolecular Interactions ◽  
Metal Phosphate ◽  
Neutral Ligand ◽  
One Pot

Abstract Using newly precipitated Cu(OH)2, o-phenanthroline and phosphoric acid as raw materials, two complicated Cu(II) compounds were obtained by one-pot method. They are double-nuclear Cu(II) 1, {[Cu2(phen)2(H2PO4)3][Cu2(phen)2(H2O)(H2PO4)3]}·2H2PO4·5H2O, and mononuclear Cu(II) 2, [Cu(phen)2(H2PO4)]4·4H3PO4·2HPO4·6H2O. The crystal structure analysis showed that the copper phosphate reacted with the neutral ligand o-phenanthroline to obtain the compounds with different structures. Phosphoric acid can exist in various forms in copper complexes, such as H3PO4, (H2PO4)1-, (HPO4)2-, and form a rich and colorful supramolecular interaction with water molecules. Hirschfeld surface analysis gives the types and regions of molecular interactions in crystals. It is of scientific significance to understand the reaction between transition metal phosphate and organic neutral ligand. The thermogravimetric and magnetic properties of compounds 1 and 2 were also reported. Magnetic analysis shows that supramolecular interactions and dipole-dipole interactions have great influence on the magnetic properties of two compounds. CCDC: 20565681 for 1; 2090334 for 2.

Room-Temperature Ceramic Nanocoating Using Nanosheet Deposition Technique

2013 ◽  
Vol 2013 (CICMT) ◽  
pp. 000014-000018 ◽  
Author(s):  
M. Osada ◽  
T. Sasaki
Keyword(s):  
Room Temperature ◽  
Organic Molecules ◽  
Structural Diversity ◽  
Layer By Layer ◽  
Precise Control ◽  
Langmuir Blodgett ◽  
Wide Range ◽  
Potential Applications ◽  
Layer Assembly ◽  
Selection Of

We present a novel procedure for ceramic nanocoating using oxide nanosheet as a building block. A variety of oxide nanosheets (such as Ti1−δO2, MnO2 and perovsites) were synthesized by delaminating appropriate layered precursors into their molecular single sheets. These nanosheets are exceptionally rich in both structural diversity and electronic properties, with potential applications including conductors, semiconductors, insulators, and ferromagnets. Another attractive aspect is that nanosheets can be organized into various nanoarchitectures by applying solution-based synthetic techniques involving electrostatic layer-by-layer assembly and Langmuir-Blodgett deposition. It is even possible to tailor superlattice assemblies, incorporating into the nanosheet galleries with a wide range of materials such as organic molecules, polymers, and inorganic/metal nanoparticles. Sophisticated functionalities or paper-like devices can be designed through the selection of nanosheets and combining materials, and precise control over their arrangement at the molecular scale.

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