Study of acid groups of lignocarbohydrate complex, isolated from spruce wood by mechanical grinding method

1974 ◽  
Vol 23 (4) ◽  
pp. 843-848
Author(s):  
N. F. Efendieva ◽  
N. N. Shorygina
Keyword(s):  
Mechanical Grinding ◽  
Grinding Method ◽  
Spruce Wood ◽  
Lignocarbohydrate Complex

scholarly journals Mechanical grinding method of multi-axis linkage for elliptic contour based on algebraic geometry

2020 ◽  
Vol 24 (3 Part A) ◽  
pp. 1561-1568
Author(s):  
Li Li
Keyword(s):  
Surface Roughness ◽  
Algebraic Geometry ◽  
Path Planning ◽  
Error Compensation ◽  
Attitude Determination ◽  
Grinding Process ◽  
Mechanical Grinding ◽  
Grinding Method ◽  
Contour Accuracy

Aiming at the shortcomings of traditional elliptic contour grinding methods, such as large grinding roughness and poor contour accuracy, a multi-axis mechanical grinding method based on algebraic geometry is proposed. This method studies the first attempt of elliptic contour. The process includes selecting suitable multi-axis grinding tools and selecting appropriate grinding methods according to grinding process. Using specific workpieces, grinding path planning, motion attitude determination and error compensation based on algebraic geometry for multi-axis mechanical grinding are carried out. The results show that compared with the traditional grinding method, the device has the smallest surface roughness, the contour radian is closer to the expected results, and has higher performance, which solves the grinding defects.

RETRACTED ARTICLE: Single-Phase β-Zn4Sb3 Prepared by a Mechanical Grinding Method

2009 ◽  
Vol 39 (9) ◽  
pp. 2172-2175 ◽  
Author(s):  
Chinatsu Okamura ◽  
Takashi Ueda ◽  
Kazuhiro Hasezaki
Keyword(s):  
Single Phase ◽  
Mechanical Grinding ◽  
Grinding Method ◽  
Retracted Article

Two Dimensional Ultrasonic Vibration Assisted Chemo-Mechanical Grinding of Si Wafer

2010 ◽  
Vol 126-128 ◽  
pp. 282-288
Author(s):  
Zhen Zhong Wang ◽  
Yong Bo Wu ◽  
Li Bo Zhou ◽  
Yin Biao Guo ◽  
Chen Xu Wu
Keyword(s):  
Ultrasonic Vibration ◽  
Material Removal ◽  
Removal Rate ◽  
Surface Damage ◽  
Vibration Modes ◽  
Two Dimensional ◽  
Mechanical Grinding ◽  
Grinding Method ◽  
Fixed Abrasive ◽  
Si Wafer

As a new fixed-abrasive machining method, chemo-mechanical grinding (CMG) is developed from chemical mechanical polishing (CMP), with the obvious advantage of geometric accuracy determinacy and no slurry. To improve material removal rate and enhance the popularity of CMG, this paper introduces a combined grinding method, i.e., two dimensional ultrasonic vibration assisted CMG (2D-UACMG). Si wafer is taken as the workpiece and the influence of ultrasonic vibration modes and process parameters on the surface roughness and the material removal is examined. The results show 2D-UACMG can obtain better surface quality with little surface damage at nanometer level compared with the conventional CMG without the ultrasonic vibration.

Fabrication of C3N4 ultrathin flakes by mechanical grind method with enhanced photocatalysis and photoelectrochemical performance

RSC Advances ◽  
2016 ◽  
Vol 6 (53) ◽  
pp. 47813-47819 ◽  
Author(s):  
Yuyu Bu ◽  
Zhiwei Chen ◽  
Tian Xie ◽  
Weibing Li ◽  
Jin-Ping Ao
Keyword(s):  
Mechanical Grinding ◽  
Photoelectrochemical Performance ◽  
Yield Rate ◽  
Grinding Method

In this paper, we prepared a large-sized multilayer C3N4 ultrathin flake photocatalyst with an approximately 90% yield rate by a facile wet mechanical grinding method.

Nitration of lignin isolated from spruce wood by mechanical grinding

1966 ◽  
Vol 2 (1) ◽  
pp. 49-53
Author(s):  
N. N. Shorygina ◽  
N. P. Mikhailov ◽  
B. V. Lopatin
Keyword(s):  
Mechanical Grinding ◽  
Spruce Wood

Study on Wet-Grinding Preparation of Micro-Nano β-SiC

2017 ◽  
Vol 727 ◽  
pp. 343-346
Author(s):  
Xiao Lei Ren ◽  
Xiao Gang Wang ◽  
Zhi Hui Pei ◽  
Zi Min Fan ◽  
Li Rong Deng ◽  
...  
Keyword(s):  
Particle Size ◽  
Optimum Parameter ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Carbide Powder ◽  
Mechanical Grinding ◽  
Wet Grinding ◽  
Grinding Method ◽  
Medium Change ◽  
Scanning Electron

In this research, the effects of main parameters such as speed of agitator, concentration and redium change ratio on the grinding effect were studied by the method of wet-grinding. The powder was characterized and analyzed by means of particle size analysis and scanning electron microscope. The results show that the mechanical grinding method can effectively prepare micro-nanosilicon carbide powder with particle size of about 130nm, the optimum parameter is the rotational speed 1000r/min, the concentration is 30%, the medium change ratio is 75%.

Inhomogeneities in the Chemical Structure of Spruce Lignin

Holzforschung ◽  
2003 ◽  
Vol 57 (2) ◽  
pp. 165-170 ◽  
Author(s):  
H. Önnerud ◽  
G. Gellerstedt
Keyword(s):  
Chemical Structure ◽  
Kraft Pulp ◽  
Periodate Oxidation ◽  
Middle Lamella ◽  
Size Exclusion ◽  
Thermomechanical Pulp ◽  
Normal Wood ◽  
Mechanical Grinding ◽  
Spruce Wood ◽  
Exclusion Chromatography

Summary Thioacidolysis, periodate oxidation and size exclusion chromatography (SEC) were used for the analysis of spruce lignin samples. The standard thioacidolysis method was modified by including a pre-swelling of the lignocellulosic sample before the reaction, and this gave a higher yield of monomer products. Middle lamella and compression wood lignin was found to contain a larger amount of oligomers after thioacidolysis than normal wood lignin. Analysis by thioacidolysis of a thermomechanical pulp (TMP) revealed that approximately 10% of the β-O-4 structures in the lignin were cleaved due to the mechanical grinding effect. From kraft pulp, the mixture of thioacidolysis products contains a major fraction having a considerably larger molecular mass than the products from spruce wood and TMP. The structure of this material is still unknown.

Sign in / Sign up

Export Citation Format

Share Document