Zhou Y.F.,China quality certification center |
Applied Mechanics and Materials | Year: 2013
This paper studies of laser parameters for color marking on AISI 304 stainless steel by using Nd:YAG laser. Different laser parameters can affect metal color profoundly. The experiment focuses on some key parameters, and their optimum laser parameters are as follows: the vector step 0.005mm~0.010mm, the inter-step time 35μs~60μs, laser Q frequency 2KHz~4KHz, laser Q release time 10μs~20μs, scanning space 0.006mm~0.010mm. It is of significance in guiding practical application of laser color marking. © (2013) Trans Tech Publications, Switzerland.
Yao J.,University of Science and Technology of China |
Russel M.,Food Republic |
Wang X.,China Quality Certification Center
Environmental Progress and Sustainable Energy | Year: 2015
The entry of oxide nanoparticles (NPs) into the environment mandates study of their impact on the soil ecosystem. This study explored the medium-term impact (about 120 days) of oxide NPs on the soil microbial community and urease activity through isothermal microcalorimetry and enzyme assay. The soil samples were separately treated with four types of oxide NPs (ZnO, Al2O3, TiO2, and SiO2 NPs) at 1 μg/g soil or 500 μg/g soil compared with a control, and incubated for up to 120 days. Except for some sort of acute toxicity, the NPs have no significant deleterious effect (P>0.05) on the soil microbial community and urease activity along with the incubation time lengthening, which suggests that incubation time played a more essential role in modifying the antibacterial activity than the nature of oxide NPs. That is the medium-term impacts of oxide NPs on the soil microbial process was not very simple and monofactorial. © 2015 American Institute of Chemical Engineers Environ Prog.
News Article | February 15, 2017
China-based solar PV manufacturer Trina Solar can no longer call itself the world’s leading solar PV supplier, having been overtaken by Chinese competitor Jinko Solar, according to new figures by research and consulting firm GlobalData. A year ago, GlobalData confirmed that Chinese solar PV manufacturer Trina Solar had held onto its top spot as the world’s leading solar PV module producer in 2015, producing 4.55 gigawatts (GW) of crystalline modules, ahead of Canadian Solar and Jinko Solar. A year later and the tables have turned somewhat, with Jinko Solar shipping 6.6 to 6.7 GW of solar PV modules compared to Trina Solar’s 6.3 to 6.5 GW. Canadian Solar was relegated to third place, with shipments in the range of 5 to 5.1 GW. “JinkoSolar has witnessed impressive results over 2016, with the company’s PV modules securing China Quality Certification Center’s Top Runner Program level-one energy efficiency certification that showcases its technological strength,” explained Ankit Mathur, GlobalData’s Practice Head covering Power. Specifically, GlobalData highlighted “JinkoSolar’s efforts to expand across a large and geographically diversified customer base” as allowing “it to leverage its innovative, high-quality solar products, brand recognition and robust sales network to win several opportunities.” We saw repeated strong growth throughout 2016 from Jinko Solar, with an impressive start to the year and strong mid-year quarterly earnings allowing the company to revise its full-year shipping guidance in November. Trina Solar by no means had a bad year, but there were several lackluster results throughout the year which definitely impeded the company retaining its title as the world’s leading solar PV module supplier. The remaining solar PV manufacturers came in as follows: JA Solar in fourth place with 4.9 to 5 GW, Hanwha Q CELLS in fifth with 4.8 to 5 GW, GCL System Integration Technology at sixth with 4.6 to 5 GW, and First Solar stood in seventh place with 2.8-2.9 GW. However, most disappointing through 2016 was the performance of Yingli Solar, which only continued to slip further down the rankings. This was highlighted in December, when the company was forced to report a poor third quarter and lower 2016 shipping guidance. “Yingli, which was responsible for a shipment of around 2.1-2.2 GW in 2016, has not benefited from solar power’s growing popularity in the same way as its counterparts,” explained Mathur. “The company’s liquidity issues and debt repayments caused it to fall from seventh to eighth position in the global rankings. “The company witnessed a drop in net revenues from Q2 2016 to Q3 2016 primarily because the company’s external PV module shipments lowered along with the average selling price of its PV modules as a consequence of reduced demand in China in Q3 2016.” Buy a cool T-shirt or mug in the CleanTechnica store! Keep up to date with all the hottest cleantech news by subscribing to our (free) cleantech daily newsletter or weekly newsletter, or keep an eye on sector-specific news by getting our (also free) solar energy newsletter, electric vehicle newsletter, or wind energy newsletter.
Deng Y.,Hefei University of Technology |
Wang G.,China Quality Certification Center |
Fei M.M.,Hefei University of Technology |
Huang X.,Hefei University of Technology |
And 5 more authors.
RSC Advances | Year: 2016
A three layer membrane (TLM) of polybenzimidazole/graphite oxide/polybenzimidazole (PBI/GO/PBI) has been fabricated as an electrolyte for intermediate temperature polymer exchange membrane fuel cells (IT-PEMFCs). The membrane is prepared by encapsulating a GO layer with two single PBI membranes via a layer-by-layer procedure and subsequently imbibed with phosphoric acid (PA). The TLM exhibits a lower swelling ratio than that of the pristine PBI membrane at the same PA loading time. The mechanical strength of the TLM could reach 28.6 MPa at 150 °C, significantly higher than that of a PBI membrane (12.2 MPa). The TLM is loaded with a PA amount of 2.23H3PO4 molecules per repeat unit (PRU), which provides a proton conductivity of 0.0138 S cm-1 at 150 °C. The three layer structure promotes a membrane for PEMFCs with lower PA leakage and material corrosion. The fuel cell performance based on TLM exhibits a peak power density of 210 mW cm-2 at 150 °C. © The Royal Society of Chemistry 2016.
Li S.-L.,Beihang University |
Zhang J.,China Agricultural University |
Qi L.,Beihang University |
Duan Z.-J.,China Quality Certification Center
International Journal on Smart Sensing and Intelligent Systems | Year: 2013
An Industrial and Enterprise Greenhouse Gas Emission Data Analysis System, which meets with the need of those giant energy-consuming enterprises, has been set up through a series of studies about Greenhouse gas (GHG) verification method in industries such as cement, thermal power, cogeneration, transportation, sewage treatment etc. The analysis system consists of six modules: Organization structure; Facility; Activity data input; Emission data analysis; Report generation; Parameters configure. The calculation process is based both on Emission Factor Method and Materials Balance Method, the former method realizes an easy calculation for the GHG emissions conducted from fuel combustion, electricity or steam consumption, general business and office activities, the later one provides a specialized calculation for professional production processes such as cement production, exhaust desulfurization and sewage treatment etc. A thermal boiler's GHG emission was used as a case to test the system.
Zhang J.,Beihang University |
Li S.-J.,Beihang University |
Zhang L.,China Quality Certification Center |
Lu K.,Beihang University
Journal of Food, Agriculture and Environment | Year: 2013
In order to make the monitoring and management for industrial greenhouse gas (GHG) emissions more convenient and effective, a remote real-time monitoring method was designed and the system was developed. Monitoring sites management, remote real-time monitoring and data management are three main functions of the system. Relevant test has been done in a thermal power plant to check the data acquisition, communication and monitoring performance.
Zheng Y.,China Quality Certification Center |
Huang X.,China Quality Certification Center
Gaoya Dianqi/High Voltage Apparatus | Year: 2016
Several abnormal voltage elevation events of Tian-Guang DC transmission system happened recently resulting from the low DC voltage measurement at its inverter side. In this paper, the cause of the abnormal DC voltage elevation is analyzed based on the control strategy of Tian-Guang DC transmission system. A large number of RTDS simulation tests are conducted to investigate the over-voltage level and the response characteristics of the control and protection systems of the DC transmission system when DC voltage measurement at the inverter side is low in the cases of different grade of low DC voltage measurement fault, power level and operating mode. Simulation results show that low DC voltage measurement at the inverter side will result in overvoltage on DC system, the DC system will exhibit different control and protection performances at different fault levels, power levels and operating modes, and DC overvoltage level can be reduced in the case of high power mode and voltage-down operation mode. © 2016, Xi'an High Voltage Apparatus Research Institute Co., Ltd. All right reserved.
Zhang Y.,Beijing University of Technology |
Zhang P.,China Quality Certification Center
Chinese Control Conference, CCC | Year: 2013
Based on Finite Linear Heat Theory, through Virtual Source Method and Green Function Method, in the whole area of double-boreholes vertical U-shape pipe, the heat transfer model outside boreholes in the cylindrical coordinate is established, and the analytical solution of g-function and its modified form are obtained. Using MATLAB, the g-function curve is plotted and the soil temperature field is simulated and analyzed in case that the Ground Source Heat Exchanger works in cooling mode. In the end, the double-boreholes heat transfer process is simulated by PDE toolbox to verify the accuracy of the model. © 2013 TCCT, CAA.
Gao Y.,China Automotive Technology and Research Center |
Li Y.K.,China Automotive Technology and Research Center |
Mo X.B.,China Quality Certification Center
Advanced Materials Research | Year: 2014
Green performance assessment of power battery is a whole life cycle process, which integrates Environment (E), Resource (R), Technology (T) and Cost (C) objectives considered as evaluation of multi-objective and multi-stage. According to definition of Green Product, the assessment model of multi-objective and multi-stage for power battery was built. The green utility function is proposed, by which the evaluation data of indices are changed uniformly into range of (0, 1) according to the assessment standard initialized as 0.5. The synthesis calculation method is given, which remains all the messages in the assessment. Finally, the green performance comparison between lithium-ion battery and nickel metal hydride battery proves the assessment method and process. © (2014) Trans Tech Publications, Switzerland.
He L.,Xidian University |
Zhang X.,China Quality Certification Center
Taiyangneng Xuebao/Acta Energiae Solaris Sinica | Year: 2013
Taking noise non-destructive character and evaluation technique of solar cells as research object, the 1/f noise, g-r noise and plasma noise in solar cells were researched through stress aging and noise test. The results showed that noise has a relationship with defects, the different defects in different regions can be characterized by noise based on the noise generation mechanism and device fault physics. So the quality estimate and reliability predict can be achieved.