Single-Phase Boost Type Power Factor Corrector with Embedded Active Buffer Achieving Power Decoupling

Kaicheng Ding,Yan Zhang,Jinjun Liu,Rui Cao,Yuetao Hou,Xin Meng 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

In this paper, a boost type Power Factor Corrector is proposed to deal with the inherent issue of double line frequency power ripple, namely power coupling, in single-phase AC/DC conversion systems. The proposed converter is embedded with an active buffer circuit and the redundant capacitor and power switches enable active power decoupling and an all-film-capacitor implementation. The active power decoupling control scheme in this paper is based on the direct control of ac power and dc power and is therefore relatively easy to implement. The former one helps to achieve unit power factor at ac side while the latter one helps to regulate dc side output voltage and as a result the double line frequency power ripple could be automatically transferred onto the buffer capacitor of the converter. Theoretical analysis, simulation and experiment results are provided in the paper.

A Novel Bi-directional Promoter Cloned from Melon and Its Activity in Cucumber and Tobacco

( Cui Yan Wang ),( Dong Feng Ding ),( Rui Xiang Yan ),( Xiao Ju Yu ),( Wei Dong Li ),( Ming Gang Li ) 한국식물학회 2008 Journal of Plant Biology Vol.51 No.2

A bi-directional promoter, DP, was cloned by PCR amplification using the genomic DNA of melon as template. Analysis of its cis-acting elements in both directions revealed a series of inducible regulatory elements and some enhancer elements. To evaluate its transcriptional activity, DP in both directions was then cloned into vector pBI121 to replace the CaMV 35S promoter. DP in both directions also was inserted downstream of CaMV 35S to investigate whether the double promoter might affect expression of the uidA reporter gene at higher levels. Transient expression in cucumber leaves, stems, and fruits as well as in tobacco leaves and stems showed that DP in both directions drove transcription to much higher levels than did the single promoter CaMV 35S. However, activity of the double promoter was lower than the corresponding activity of the single promoter DP in both directions. These results demonstrate that DP is a natural bi-directional promoter, with much more activity than is found with the CaMV 35S promoter. Furthermore, in cucumber and tobacco, it is not suitable to insert DP in either direction downstream of the CaMV 35S promoter to form a double promoter.

Design of Concentrating System for Solar Side-pumped Slab Laser

Wentong Fan,Yan Liu,Pan Guo,Rui Deng,Nan Li,Fukang Ding,Yasha Li,Jun Zhou,Shiwei Xie 한국광학회 2020 Current Optics and Photonics Vol.4 No.1

The design of a concentration system for a solar side-pumped slab laser was investigated. The side size of the slab laser medium is 2 mm × 20 mm. Based on the principle of the edge ray, a secondary concentrating system consisting of a rectangular parabolic mirror (RPM) and a rectangular dielectric-filled compound parabolic concentrator (RDCPC) was demonstrated. The focal length of RPM is 1200 mm and the size is 734 mm × 2000 mm. The outlet size of the RDCPC is 2 mm × 20 mm. The concentration effect was analyzed by using Tracepro optical software. The results showed that the concentration efficiency reached 81.3% and the uniformity of the spot was 91.4% after optimization. This design of concentration system is of great reference value for a solar side-pumped slab laser.

Design of Concentrating System for Solar Side-pumped Slab Laser

Fan, Wentong,Liu, Yan,Guo, Pan,Deng, Rui,Li, Nan,Ding, Fukang,Li, Yasha,Zhou, Jun,Xie, Shiwei Optical Society of Korea 2020 Current Optics and Photonics Vol.4 No.1

The design of a concentration system for a solar side-pumped slab laser was investigated. The side size of the slab laser medium is 2 mm × 20 mm. Based on the principle of the edge ray, a secondary concentrating system consisting of a rectangular parabolic mirror (RPM) and a rectangular dielectric-filled compound parabolic concentrator (RDCPC) was demonstrated. The focal length of RPM is 1200 mm and the size is 734 mm × 2000 mm. The outlet size of the RDCPC is 2 mm × 20 mm. The concentration effect was analyzed by using Tracepro optical software. The results showed that the concentration efficiency reached 81.3% and the uniformity of the spot was 91.4% after optimization. This design of concentration system is of great reference value for a solar side-pumped slab laser.

Production of 1,5-Dihydroxy-3-Methoxy-7-Methylanthracene-9,10-Dione by Submerged Culture of Shiraia bambusicola

( Yu Jie Cai ),( Yan Rui Ding ),( Guan Jun Tao ),( Xiang Ru Liao ) 한국미생물 · 생명공학회 2008 Journal of microbiology and biotechnology Vol.18 No.2

Research on training Strategy of information Technology Application Ability of Normal university students

Shi-mei JIN,Liu-wen DING,Ding-rui LIU,Hui-yan LI ASCONS 2020 IJASC Vol.2 No.4

Background/Objectives: Under the background of educational informatization, the realization of education modernization and information education is the inevitable trend of future education development. As the backbone of the future teacher team, the level of information technology application ability of normal university students is the key to the modernization of future education. Therefore, the ministry of education proposed to strengthen the cultivation of information literacy of normal university students. Methods/Statistical analysis: As the cradle of basic education teachers in yanbian prefecture, yanbian university should strengthen the cultivation of information technology application ability of normal university students and study the current situation of the cultivation. In this paper, two questionnaires were conducted before and after the training of normal university students in yanbian university. Findings: Through the comparison and analysis of the two data by SPSS software, it is found that there is no specific training for normal university students in the training of information technology application ability of normal university students in yanbian university. Teaching less theoretical knowledge; Students have fewer opportunities to practice the problem. Improvements/Applications: Finally, the author puts forward some strategies for the future cultivation of information technology application ability of normal university students in yanbian university. For the training of excellent information teachers to contribute.

Production and Characterization of Ethanol- and Protease-Tolerant and Xylooligosaccharides-Producing Endoxylanase from Humicola sp Ly01

( Jun Pei Zhou ),( Qian Wu ),( Rui Zhang ),( Yu Ying Yang ),( Xiang Hua Tang ),( Jun Jun Li ),( Jun Mei Ding ),( Yan Yan Dong ),( Zun Xi Huang ) 한국미생물 · 생명공학회 2013 Journal of microbiology and biotechnology Vol.23 No.6

This paper reports the production and characterization of crude xylanase from the newly isolated Humicola sp. Ly01. The highest (41.8 U/ml) production of the crude xylanase was obtained under the optimized conditions (w/v): 0.5% wheat bran, 0.2% KH2PO4, and 0.5% peptone; initial pH 7.0; incubation time 72 h; 30℃; and 150 rpm. A considerable amount of the crude xylanase was induced using hulless barley bran or soybean meal as the carbon source, but a small amount of the enzyme was produced when supplementary urea was used as the nitrogen source to wheat bran. The crude xylanase showed apparent optimal cellulase-free xylanase activity at 60℃ and pH 6.0, more than 71.8% of the maximum xylanase activity in 3.0-30.0% (v/v) ethanol and more than 82.3% of the initial xylanase activity after incubation in 3.0-30.0% (v/v) ethanol at 30℃ for 2 h. The crude xylanase was moderately resistant to both acid and neutral protease digestion, and released 7.9 and 10.9 μmol/ml reducing sugar from xylan in the simulated gastric and intestinal fluids, respectively. The xylooligosaccharides were the main products of the hydrolysis of xylan by the crude xylanase. These properties suggested the potential of the crude enzyme for being applied in the animal feed industry, xylooligosaccharides production, and high-alcohol conditions such as ethanol production and brewing.

Meta-analysis of Gene Expression Data Identifies Causal Genes for Prostate Cancer

Wang, Xiang-Yang,Hao, Jian-Wei,Zhou, Rui-Jin,Zhang, Xiang-Sheng,Yan, Tian-Zhong,Ding, De-Gang,Shan, Lei Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.1

Prostate cancer is a leading cause of death in male populations across the globe. With the advent of gene expression arrays, many microarray studies have been conducted in prostate cancer, but the results have varied across different studies. To better understand the genetic and biologic mechanisms of prostate cancer, we conducted a meta-analysis of two studies on prostate cancer. Eight key genes were identified to be differentially expressed with progression. After gene co-expression analysis based on data from the GEO database, we obtained a co-expressed gene list which included 725 genes. Gene Ontology analysis revealed that these genes are involved in actin filament-based processes, locomotion and cell morphogenesis. Further analysis of the gene list should provide important clues for developing new prognostic markers and therapeutic targets.

Heavy concrete shielding properties for carbon therapy

Jin-Long Wang,Jiade J Lu,Da-Jun Ding,Wen-Hua Jiang,Ya-Dong Li,Rui Qiu,Hui Zhang,Xiao-Zhong Wang,Huo-Sheng Ruan,Yan-Bing Teng,Xiao-Guang Wu,Yun Zheng,Zi-Hao Zhao,Kai-Zhong Liao,Huan-Cheng Mai,Xiao-Dong Korean Nuclear Society 2023 Nuclear Engineering and Technology Vol.55 No.6

As medical facilities are usually built at urban areas, special concrete aggregates and evaluation methods are needed to optimize the design of concrete walls by balancing density, thickness, material composition, cost, and other factors. Carbon treatment rooms require a high radiation shielding requirement, as the neutron yield from carbon therapy is much higher than the neutron yield of protons. In this case study, the maximum carbon energy is 430 MeV/u and the maximum current is 0.27 nA from a hybrid particle therapy system. Hospital or facility construction should consider this requirement to design a special heavy concrete. In this work, magnetite is adopted as the major aggregate. Density is determined mainly by the major aggregate content of magnetite, and a heavy concrete test block was constructed for structural tests. The compressive strength is 35.7 MPa. The density ranges from 3.65 g/cm³ to 4.14 g/cm³, and the iron mass content ranges from 53.78% to 60.38% from the 12 cored sample measurements. It was found that there is a linear relationship between density and iron content, and mixing impurities should be the major reason leading to the nonuniform element and density distribution. The effect of this nonuniformity on radiation shielding properties for a carbon treatment room is investigated by three groups of Monte Carlo simulations. Higher density dominates to reduce shielding thickness. However, a higher content of high-Z elements will weaken the shielding strength, especially at a lower dose rate threshold and vice versa. The weakened side effect of a high iron content on the shielding property is obvious at 2.5 µSv=h. Therefore, we should not blindly pursue high Z content in engineering. If the thickness is constrained to 2 m, then the density can be reduced to 3.3 g/cm³, which will save cost by reducing the magnetite composition with 50.44% iron content. If a higher density of 3.9 g/cm³ with 57.65% iron content is selected for construction, then the thickness of the wall can be reduced to 174.2 cm, which will save space for equipment installation.