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GB/T 39131-2020: Terms and definitions of synthetic crystal materials
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| GB/T 39131-2020 | English | 559 |
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Terms and definitions of synthetic crystal materials
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GB/T 39131-2020
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Basic data | Standard ID | GB/T 39131-2020 (GB/T39131-2020) | | Description (Translated English) | Terms and definitions of synthetic crystal materials | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | Q65 | | Classification of International Standard | 01.040.01 | | Word Count Estimation | 30,399 | | Date of Issue | 2020-10-11 | | Date of Implementation | 2021-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 39131-2020: Terms and definitions of synthetic crystal materials---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Terms and definitions of synthetic crystal materials
ICS 01.040.01
Q65
National Standards of People's Republic of China
Intraocular lens material terms
2020-10-11 released
2021-09-01 implementation
State Administration for Market Regulation
Issued by the National Standardization Management Committee
Table of contents
Preface Ⅲ
1 Scope 1
2 Basic terminology 1
3 Category 2
4 growth 4
5 Detection and characterization 10
6 Processing and post-processing 12
Reference 16
Index 17
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the China Building Materials Federation.
This standard is under the jurisdiction of the National Intraocular Lens Standardization Technical Committee (SAC/TC461).
Drafting organizations of this standard. Beijing Sinoma Artificial Crystal Research Institute Co., Ltd., Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, China
Xinjiang Institute of Physics and Chemistry, Nankai University, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Shanghai Institute of Silicate Research, Chinese Academy of Sciences
Institute, Jinan Liguan Electronic Technology Co., Ltd.
The main drafters of this standard. Wang Haili, Hang Yin, Pan Shilie, Sun Jun, Xue Dongfeng, Ren Guohao, Chen Jianrong, Huang Cunxin, Wang Ying, Sun Congting,
Han Shujuan, Liang Dandan, Zhang Yamei, Song Depeng.
Intraocular lens material terms
1 Scope
This standard defines the basic terminology, classification, growth, detection and characterization, processing and post-processing of intraocular lens materials.
Language and definition.
This standard applies to intraocular lens materials and related applications.
2 Basic terminology
2.1
Crystals
A solid substance formed by periodic arrangement of internal particles (atoms, ions or molecules) in a three-dimensional space.
2.2
Natural crystal
Crystals formed naturally in nature.
2.3
Intraocular lens
Crystals prepared by artificial methods.
2.4
Single crystal
A substance with a continuous crystal structure.
2.5
Polycrystalline
A substance composed of two or more single crystals.
2.6
Crystal structure
A spatial arrangement formed by periodic repetition of the mass points in a crystal with a certain symmetry.
2.7
Unit cell
The smallest repeating unit that can reflect crystal symmetry and periodicity.
2.8
Crystal system
The system is divided according to the rotation axis contained in the crystal.
Note. According to the level of crystal symmetry, it can be divided into 7 crystal systems. equiaxed (cubic) crystal system, hexagonal crystal system, tetragonal crystal system, trigonal crystal system, orthorhombic (orthogonal) crystal system, monoclinic crystal system, and triclinic crystal system Crystal system.
2.9
Point group
The set of all symmetry operations of symmetry elements grouped together by one point.
Note. According to its symmetry elements, it is divided into 32 independent point groups.
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