The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
This paper proposes a three-phase six-inductor double-switch PFC circuit which is suitable for high frequency UPS application. This PFC circuit not only achieves high power factor correction in grid-connected mode of UPS, but also improves bus voltage in battery mode of UPS. This new PFC removes the independent boost design in common UPS and the whole cost can be reduced. The topology structure and...
A step-up control method is proposed to solve the problem of the normalized voltage gain less than 1 when the bi-directional LLC resonant converter works in backward mode. This step-up control method turns on rectifier switches to help resonant components recover their energy and improves the normalized voltage gain to 2. Working principle of the bidirectional LLC resonant converter is introduced...
For a better understanding of the air-sea interactions that occur during typhoons and improved accuracy in typhoon forecasting, the Institute of Oceanography at the National Taiwan University has developed a buoy that can measure meteorological and hydrographic conditions, and transmit the high-precision data in near real-time. The buoy captures various types of meteorological data, including air...
There is an urgent need among the scientific community for a better understanding of the air-sea interactions that occur during typhoons and improved accuracy in typhoon forecasting. To this end, the Institute of Oceanography at the National Taiwan University (IONTU) has developed a buoy that can measure meteorological and hydrographic conditions, and transmit the high-precision data in near real-time...
Vapor compression heat pump has good prospects in future large-scale spacecraft thermal control technology. Compressor is a key component in vapor compression heat pump. It is essential to study its adaptability under micro-gravity. In this paper, an experimental system was built up to test the performance of inverted compressor subjected to micro-gravity. The performance of compressor upright and...
The application of energy saving glass (ESG) is becoming a popular trend in future energy smart buildings. However, the ESG attenuates useful signals which are necessary for the communication systems owing to its coating. To solve this problem, this paper presents a Tri-bandpass frequency selective surface (FSS) on the coating of ESG for GSM 900/1800/1900 MHz, UMTS 2100 MHz frequency bands and 5G...
In order to face the challenges of feature sparsity of short text messages for microblog hot topic detection, in this paper, we first explore the relation between terms, and then build term correlation matrix which is much denser than term-document matrix. Symmetric non-negative matrix factorization (SNMF) on term correlation matrix is applied to obtain term-topic matrix. Finally, we formulated the...
As a new information hiding technology, digital watermarking attracted more and more attention in copyright protection. This paper proposed a DCT domain blind watermarking algorithm based on Arnold and quantification. Firstly we conduct Arnold chaotic scrambling to the watermarking before the embedding, to reduce the correlation between pixels and improve the security of the watermarking, then according...
The biodegradation of most refractory organics is carried out by means of co-metabolism. On one hand, this article briefly described the theory research of microbial co-metabolism, on the other hand, anaerobic co-digestion plays an important role in agricultural waste, efficient use of manure and the improvement of mathane production. Make full use of waste resources. What's more, analyse co-digestion...
Three areas are selected as the study area, including Tianjin Binhai New Area located in Bohai Bay, Jinzhou Bay Coastal Economic Zone located in Liaodong Bay and Eco-efficient Yellow River Delta Economic Zone located in Laizhou Bay. Based on their intensity of development and the marine environment, combined with the regional characteristics, the sea developing activities on the marine ecological...
Anaerobic digestion technology of organic waste is considered sustainable and optimum. However, the process of anaerobic digestion at mesophilic and thermophilic temperatures is well understood and applied, psychrophilic temperatures treatment has not been explored widely which could reduce operation cost considerably. This review states the research progress and cold-adapted mechanism of psychrophilic...
High concentration of anaerobic fermentation with wheat straw and cow dung as inoculums were conducted for investigating the variation of interrelated index, such as pH, VFAs, TOC, TN and the variation of internal morphology of wheat straw. The results showed that the high concentration of anaerobic fermentation reactor run steady, pH decreased and then increased over time, eventually stabilized at...
Some analyses on air-air ejector are presented, which focus on the effects of fluid state parameters on the ejection coefficient by numerical calculation. Results indicate that to increase the pressure of working fluid or infection fluid is effective to obtain a high ejection coefficient of air-air ejector, and so it is to decrease the pressure of mixing fluid. Besides, increase the temperature of...
To investigate the possibility of the rapidly starting of the SBR reactor, the start-up effect of aerobic granular sludge cultivated with and without nuclei were compared at low temperature. In the reactor which added aerobic denitrification biofilm debris as nuclei, aerobic granular formed after 30 days of operation at 20°C, the average diameter of granular achieved 7.8mm, MLSS was above 12.275g/L,...
Immobilized microorganism technology is an effective method of removing water pollutant in source waters. The effect of biologically immobilized ceramic particles is better in removing the pollutant than simple filter or engineering bacteria liquid, due to the two factors including the adsorption and entrapment function of the filter materials in the biofilter and the biodegradation of the microorganisms...
This paper deals with the extracellular polymeric substance (EPS) of Rhizobium radiobacter F2 used as a novel biosorbent to remove Cu (II) and Mn (II) ions from aqueous solutions. The Cu (II) and Mn (II) ions biosorption characteristics of the EPS were examined as a function of initial pH, contact time and EPS concentration. The proper pH of the aqueous solution was found to be 6.0 for both the biosorption...
In order to reveal the molecular mechanisms and the metabolic pathway of producing bioflocculant, the changes in protein complexes of F2 grown in minimal media versus bioflocculant media and those of F6 grown in minimal media versus bioflocculant media were respectively researched by SDS-PAGE. SDS-PAGE results indicated that the relative band volumes of three bands were obviously decreased in F2,...
Simultaneous biological phosphorous and nitrogen removal was investigated in an anaerobic/anoxic sequencing batch reactor (A/A SBR) enriched with denitrifying phosphorous removing bacteria (DPB) sludge. The lab-scale experiments were conducted under the conditions of various SRTs (14d, 60d, and 34d), COD concentrations (200 mg/L, 400 mg/L, and 600 mg/L), and nitrate concentrations (60, 80, 100 mg/L)...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.