Preparation of Characterization of Calcium Carbonate/Titanate Composite Material by Mechano-Activated Method

2007 ◽  
Vol 353-358 ◽  
pp. 1358-1361 ◽  
Author(s):  
Ya Li Du ◽  
Hao Ding ◽  
Yan Gai Liu ◽  
Yan Xi Deng
Keyword(s):  
Composite Material ◽  
Surface Modification ◽  
Calcium Carbonate ◽  
Physical Property ◽  
Fine Grinding ◽  
Application Characteristics ◽  
And Performance ◽  
Ultra Fine Grinding

The effects of technology condition and performance of calcium carbonate/titanate composite material (CCTCM) prepared by mechano-activated method were studied in this paper. The results show that CCTCM can be prepared by the surface modification of calcium carbonate using titanate as a modification agent incorporated with the simultaneous wet ultra-fine grinding, and the modification results and performance of composite material are affected by the grinding condition of calcium carbonate. CCTCM has good application characteristics from its physical property and the performance of packing polyethylene (PE).

Preparation and Characterization of Tourmaline/TiO2 Composite Particles Material

2010 ◽  
Vol 96 ◽  
pp. 145-150
Author(s):  
Ning Liang ◽  
Hao Ding ◽  
Yan Peng Zha
Keyword(s):  
Surface Modification ◽  
Chemical Method ◽  
Negative Ions ◽  
Composite Particles ◽  
Mechanical Forces ◽  
Fine Grinding ◽  
Modification Effect ◽  
And Performance ◽  
Ultra Fine Grinding

The preparation of tourmaline/TiO2 composite particles material (TTCPM) by mechano-chemical method and its performance were studied in this paper. The results show that tourmaline/TiO2 composite particles material can be prepared by the surface modification of tourmaline using TiO2 as a modifier with wet ultra-fine grinding tourmaline and TiO2 together after tourmaline is ground to required size. The modification effect and performance of TTCPM are influenced by the dosage of TiO2, the pulp concentration and the grinding condition under which the mechanical forces can be produced. Comparing the properties of the TTCPM with that of tourmaline, negative ions quantity does not change and whiteness increases remarkably. In addition, the properties of pigment, such as hiding power, are added.

scholarly journals Noise and Breakdown Characterization of SPAD Detectors with Time-Gated Photon-Counting Operation

Sensors ◽  
2021 ◽  
Vol 21 (16) ◽  
pp. 5287
Author(s):  
Hiwa Mahmoudi ◽  
Michael Hofbauer ◽  
Bernhard Goll ◽  
Horst Zimmermann
Keyword(s):  
Breakdown Voltage ◽  
Single Photon ◽  
Photon Counting ◽  
Low Noise ◽  
Dark Count ◽  
Fully Integrated ◽  
Trade Offs ◽  
And Performance ◽  
Noise Models

Being ready-to-detect over a certain portion of time makes the time-gated single-photon avalanche diode (SPAD) an attractive candidate for low-noise photon-counting applications. A careful SPAD noise and performance characterization, however, is critical to avoid time-consuming experimental optimization and redesign iterations for such applications. Here, we present an extensive empirical study of the breakdown voltage, as well as the dark-count and afterpulsing noise mechanisms for a fully integrated time-gated SPAD detector in 0.35-μm CMOS based on experimental data acquired in a dark condition. An “effective” SPAD breakdown voltage is introduced to enable efficient characterization and modeling of the dark-count and afterpulsing probabilities with respect to the excess bias voltage and the gating duration time. The presented breakdown and noise models will allow for accurate modeling and optimization of SPAD-based detector designs, where the SPAD noise can impose severe trade-offs with speed and sensitivity as is shown via an example.

Sign in / Sign up

Export Citation Format

Share Document