Test Tasks on Bases of 3D-Modelling

2016 ◽  
Vol 4 (4) ◽  
pp. 60-68 ◽  
Author(s):  
Большаков ◽  
V. Bolshakov ◽  
Чагина ◽  
A. Chagina

At the beginning of this paper a short review of known geometric and graphic tests has been presented, and a practical lack of test tasks on computer graphics tools application for geometrical simulation problems solution has been emphasized. The test tasks directed to assessment the level of intellectual abilities related to the optimum choice of solid-state simulation tools for creation and editing products’ parametrical sketches and models in the KOMPAS-3D system are offered. The content of the developed test tasks is based on analysis of 3D simulation’s stages within which novice users allow maximum number of wrong or far from optimum actions. In the test task on rational construction of parametrical sketches it is necessary to choose commands from the submitted lists for creation of the shown sketches. Tasks on solid-state simulation for details are based on the analysis of a form of fifteen models shown in axonometric projections. It is offered to optimize simulation procedures and to specify a minimum number of forming operations for creation of shown details models. Tasks on solid-state models editing show a multivariance of procedures for models creation and editing; these tasks have been directed to the rational choice for the minimum number of the forming operations for models modification. In a task on kinds insert in an associative drawing it is offered to make for the details shown in axonometry a right choice on number and content of necessary images in the associative drawing. In a test task on solid-state simulation for two-component assembly units is required to choose from a presented set of separate components the ones which are necessary for subsequent mental conjunction by executing the command “components’ side coincidence”.

RSC Advances ◽  
2015 ◽  
Vol 5 (107) ◽  
pp. 88409-88413 ◽  
Author(s):  
Libang Kuai ◽  
Yong Zhou ◽  
Wengguang Tu ◽  
Ping Li ◽  
Haijin Li ◽  
...  

An all-solid-state Z-scheme was constructed for the photocatalytic reduction of CO2, consisting of CdS and TiO2 as photocatalysts, and reduced graphene oxide as a solid electron mediator.


Catalysts ◽  
2018 ◽  
Vol 8 (8) ◽  
pp. 332 ◽  
Author(s):  
Olena Vozniuk ◽  
Tommaso Tabanelli ◽  
Nathalie Tanchoux ◽  
Jean-Marc Millet ◽  
Stefania Albonetti ◽  
...  

This short review reports on spinel-type mixed oxides as catalysts for the transformation of biomass-derived building blocks into chemicals and fuel additives. After an overview of the various methods reported in the literature for the synthesis of mixed oxides with spinel structure, the use of this class of materials for the chemical-loop reforming of bioalcohols is reviewed in detail. This reaction is aimed at the production of H2 with intrinsic separation of C-containing products, but also is a very versatile tool for investigating the solid-state chemistry of spinels.


2019 ◽  
Vol 1 (2) ◽  
pp. 91-100 ◽  
Author(s):  
Yumei Wang ◽  
Shufeng Song ◽  
Chaohe Xu ◽  
Ning Hu ◽  
Janina Molenda ◽  
...  

Author(s):  
R. Niewa

AbstractThe chemistry of nitrides and nitridometalates is a rapidly growing field in solid state chemistry. This short review is intended to give a brief but comprehensive over-view on the compounds and phases formed with manga-nese, which cover an especially broad range of oxidation states. Furthermore, the present paper tries to put the ob-served structures and properties of the compounds into a broader context.


2014 ◽  
Vol 1 (10) ◽  
pp. 721-734 ◽  
Author(s):  
Sha Ou ◽  
Chuan-De Wu

The recently developed strategies on designed synthesis of porous metal–organic framework catalysts and their interesting catalytic properties are summarized in this short review.


2010 ◽  
Vol 132 ◽  
pp. 1-18 ◽  
Author(s):  
Saghar Sepehri ◽  
Yan Yi Liu ◽  
Guo Zhong Cao

Hydrogen generated from clean and renewable energy sources has been considered as an alternate fuel to carbon based fossil fuels for several decades. Although many advances in hydrogen production and usage have been made, storing hydrogen remains a significant challenge. Many drawbacks including energy intensive processes, low volumetric densities, and safety concerns are associated with storing hydrogen as pressured or liquefied. Solid state hydrogen storage is considered to be the most promising method as a safe and effective storage option, but there is still no material or method that satisfies the requirements for a practical approach. A feasible hydrogen storage media should address several issues including targeted storage capacities, thermodynamics and hydrogen sorption kinetics, and safety. Nanostructured materials can provide tailor-made properties for storing and releasing hydrogen to fulfill, at least, the partial requirements. This short review, not a comprehensive review of all the materials or technologies in hydrogen storage, summarizes some of the recent developments in application of nanostructures for solid state hydrogen storage; particular attention has been devoted to the most recent development of nanocomposites with tuned dehydrogenation temperatures and kinetics through the control of pore size and surface chemistry.


Author(s):  
Leslie J. May ◽  
George K. H. Shimizu

AbstractThe supramolecular chemistry of discrete assemblies of various topologies (cages, grids, helices, etc.) has been extensively studied. With regards to the supramolecular chemistry of infinite solids, attention is usually focussed on the design of an efficient, programmed assembly motif through the choice of suitable building blocks. However, as well illustrated by the discrete structures, a hallmark property of a supramolecular system is its ability to reversibly assemble to optimize its structure, effectively error checking. For a rigid infinite framework, this feature is less obvious. Error checking is manifested in an extended framework through structural rearrangements in the solid state. Coordination frameworks, as they are often at least partially sustained by weaker interactions, can demonstrate such dynamic behavior in response to some external stimulus. Selected examples, chosen to illustrate a range of network types and rearrangements, will be discussed in this short review.


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