Design of Dual-channel Sine Wave Generator with Tunable Phase Difference

Li-hua Wu,Ming-ling Yang,Shuo-Li,Xu-Zhang Zhang 보안공학연구지원센터(IJSIP) 2014 International Journal of Signal Processing, Image Vol.7 No.3

Five novel species of the genus Nocardiopsis isolated from hypersaline soils and emended description of Nocardiopsis salina Li et al. 2004

Li, Wen-Jun,Kroppenstedt, Reiner M.,Wang, Dong,Tang, Shu-Kun,Lee, Jae-Chan,Park, Dong-Jin,Kim, Chang-Jin,Xu, Li-Hua,Jiang, Cheng-Lin Microbiology Society 2006 International journal of systematic and evolutiona Vol.56 No.5

<P>Five novel Nocardiopsis strains isolated from hypersaline soils in China were subjected to a polyphasic analysis to determine their taxonomic position. All of the novel isolates could grow on agar plates at NaCl concentrations of up to 18 % (w/v), with optimum growth at 5-8 %. The DNA G+C contents of the novel strains ranged from 67.9 to 73.2 mol%. The morphological and chemotaxonomic characteristics of the isolates matched those described for members of the genus Nocardiopsis. Based on their 16S rRNA gene sequence analysis, DNA-DNA hybridization values and phenotypic characteristics, including the composition of cell-wall amino acids and sugars, menaquinones, polar lipids and cellular fatty acids, the isolates are proposed as representing five novel species of the genus Nocardiopsis. The novel species are proposed as Nocardiopsis gilva sp. nov. [type strain YIM 90087T (=KCTC 19006T=CCTCC AA 2040012T=DSM 44841T)], Nocardiopsis rosea sp. nov. [type strain YIM 90094T (=KCTC 19007T=CCTCC AA 2040013T=DSM 44842T), Nocardiopsis rhodophaea sp. nov. [type strain YIM 90096T (=KCTC 19049T=CCTCC AA 2040014T=DSM 44843T), Nocardiopsis chromatogenes sp. nov. [type strain YIM 90109T (=KCTC 19008T=CCTCC AA 2040015T=DSM 44844T) and Nocardiopsis baichengensis sp. nov. [type strain YIM 90130T (=KCTC 19009T=CCTCC AA 2040016T=DSM 44845T). On the basis of the chemotaxonomic data, the description of the recently described species Nocardiopsis salina Li et al. 2004 is emended.</P>

Synthesis of Phosphorous Phenanthrene/L-Tryptophan Flame Retardant for Enhanced Flame Retardancy of Epoxy Resins

Li Li,Fenglin Hua,Hui Xi,Jing Yang,Ting Xiao,Rui Zuo,Xueqing Xu,Zhiwang Yang,Ziqiang Lei 한국고분자학회 2022 Macromolecular Research Vol.30 No.12

A new type of phosphorus-containing intrinsic flame retardant was prepared with L-tryptophan (L-Trp) and 9,10-dihydro-9-oxa-10-phosphorbenzophenanthrene- 10-oxide (DOPO) as the main components. The Schiff base from the reaction of 1,4-terephthalaldehyde and L-tryptophan provides active sites, and then the phosphorous compound, DOPO, is successfully introduced into the Schiff base to synthesize L-Trp-DOPO flame retardant. The intrinsic flame retardant property of LTrp- DOPO comes from the reaction of carbonyl groups and the epoxy groups in epoxy resin (EP) matrix. The prepared L-Trp-DOPO flame retardant can efficiently improve the flame retardancy and smoke suppression of the base material of EP. Cone calorimetric test (CCT) of EP/L-Trp-DOPO composite material was carried out. The data showed that the peak heat release rate (pk-HRR) value was reduced by 50.8% (from 1459 kW/m2 to 717 kW/m2), the THR value reduced by 78.3%, and the limiting oxygen index (LOI) value was increased by 24%. The addition of new flame retardant greatly reduced the release of toxic CO gas. The flame retardant mechanism was explored, and it can be found that after thermal decomposition of L-Trp- DOPO a dense carbon layer can be produced to isolate the fire source. In addition, during the combustion process, L-Trp-DOPO will produce phosphorus-containing free radicals which will quench the active free radicals in the gas phase and dilute the combustible gas. The prepared L-Trp-DOPO flame retardant has a flame retardant effect in both the condensed phase and the gas phase during the combustion process.

Pseudonocardia rhizophila sp. nov., a novel actinomycete isolated from a rhizosphere soil

Li, Jie,Zhao, Guo-Zhen,Huang, Hai-Yu,Zhu, Wen-Yong,Lee, Jae-Chan,Kim, Chang-Jin,Xu, Li-Hua,Zhang, Li-Xin,Li, Wen-Jun Springer-Verlag 2010 Antonie van Leeuwenhoek Vol.98 No.1

Acculturation Typology

( Li Hua Xu ),( Diane Montgomery ) 한국주관성연구학회 2008 Journal of Human Subjectivity Vol.6 No.1

Neoadjuvant Chemotherapy for Resectable Esophageal Carcinoma: A Meta-analysis of Randomized Clinical Trials

Xu, Xiao-Hua,Peng, Xue-Hong,Yu, Ping,Xu, Xiao-Yuan,Cai, Er-Hui,Guo, Pi,Li, Ke Asian Pacific Journal of Cancer Prevention 2012 Asian Pacific journal of cancer prevention Vol.13 No.1

Neoadjuvant chemotherapy for resectable esophageal carcinoma has been a focus of study, but no agreement has been reached on clinical randomized controlled trials and relevant systematic evaluation. The purpose of this study was to perform a meta-analysis on published randomized controlled trials (RCTs) that compared neoadjuvant chemotherapy and surgery with surgery alone for resectable esophageal carcinoma. Medline and manual searches was conducted in PubMed, ASCO (American Society of Clinical Oncology) meeting summary, Embase, the Cochrane Library (up to October 2010), Chinese Biomedical Literature Database, China National Knowledge Infrastructure, VIP Database, Wanfang Database. The selection contents were to identify all published and unpublished RCTs that compared neoadjuvant chemotherapy and surgery with surgery alone for resectable esophageal carcinoma. Sixteen RCTs which included 2,594 patients were selected. The risk ratio (RR) (95% confidence interval [CI]; P value), expressed as neoadjuvant chemotherapy and surgery versus surgery alone (treatment versus control), was 1.02 (0.95, 1.10; P=0.54) for 1-year survival, 1.29 (1.13, 1.47; P=0.0001) for 3-year survival, 1.31 (1.13, 1.51; P=0.0003) for 5-year survival, 1.00 (0.95, 1.04; P= 0.85) for rate of resection and 0.89 (0.64, 1.23; P=0.48) for operative mortality. The results showed that neoadjuvant chemotherapy for resectable esophageal carcinoma can raise the overall survival rate of patients with esophageal carcinoma, but it does not affect treatment-related mortality.

Citricoccus alkalitolerans sp. nov., a novel actinobacterium isolated from a desert soil in Egypt

Li, Wen-Jun,Chen, Hua-Hong,Zhang, Yu-Qin,Kim, Chang-Jin,Park, Dong-Jin,Lee, Jae-Chan,Xu, Li-Hua,Jiang, Cheng-Lin Microbiology Society 2005 International journal of systematic and evolutiona Vol.55 No.1

<P>An actinobacterium, strain YIM 70010<SUP>T</SUP>, which was isolated from a desert soil sample collected in Egypt, was subjected to a polyphasic taxonomy study. The organism was alkalitolerant and its optimum growth occurred at pH 8·0-9·0. The isolate contained chemotaxonomic markers that were characteristic of the genus <I>Citricoccus</I>, i.e. the peptidoglycan type Lys-Gly-Glu (variation A4<I>α</I>), the predominant menaquinone MK-9(H2) and a polar lipid profile consisting of diphosphatidylglycerol, phosphatidylglycerol, phosphatidylinositol and two unknown glycolipids. The major fatty acids were anteiso-C15 : 0 and iso-C15 : 0. The G+C content of the genomic DNA was 63·8 mol%. Strain YIM 70010<SUP>T</SUP> exhibited a 16S rRNA gene sequence similarity of 99·6 % and DNA-DNA relatedness value of 56 % with <I>Citricoccus muralis</I> DSM 14442<SUP>T</SUP>. The phenotypic characteristics and DNA-DNA relatedness data indicate that strain YIM 70010<SUP>T</SUP> can be distinguished from <I>C. muralis</I> (DSM 14442<SUP>T</SUP>). Therefore, on the basis of the polyphasic taxonomic data presented, a novel species of the genus <I>Citricoccus</I>, <I>Citricoccus alkalitolerans</I> sp. nov. (type strain, YIM 70010<SUP>T</SUP>=CCTCC AA 203008<SUP>T</SUP>=DSM 15665<SUP>T</SUP>=KCTC 19012<SUP>T</SUP>) is proposed.</P>

중국 석탄이용 합성연료 생산 산업 현황

허려화(Li-Hua Xu),Shu-min Fan,김형택(Hyung-Taek Kim),유영돈(Young-Don Yoo) 한국에너지기후변화학회 2015 에너지기후변화학회지 Vol.10 No.1

중국에서는 중장기적으로 석탄을 주요 에너지원으로 사용하는 에너지소비 구조가 계속될 것으로 예상되어, 석탄의 청정 이용에 대한 실증화 연구가 활발히 진행되고 있다. 석탄액화를 포함한 현대 석탄화학 전환 기술을 통한 생산물질들은 석유화학 제품들을 대체할 수 있어 석유의 의존도를 낮출 수 있어, 중국에서는 대규모의 석탄이용 합성연료생산 플랜트가 운전 중 혹은 건설 중에 있다. 또한 중국에서는 이미 자체 F-T(Fischer Tropsch) 합성 기술을 개발하여 상업화 운전 성공하였다. 현재 중국에는 세계 최초로 백만 톤 규모의 석탄직접 액화 플랜트가 건설되어 운전 중에 있고, 세계 최대 석탄 간접액화플랜트가 건설 중에 있다. Since China government anticipates that coal is a major resource in energy demand sector during long term, demonstration research using Clean Coal Technology(CCT) has been developed actively. Coal to chemicals technology such as coal to liquids (CTL) process, which may produce chemical product and substitute to petrochemical refined through conventional oil, reduces the dependence of petroleum usage. Thus, many coal gasification plants have been operated and constructed in China. In China, the commercial synthesis plants using F-T technology developed by domestic research have been successfully operated. Currently, worlds first one million tonnes of CTL plant using direct conversion process is operated and the world largest CTL plant using indirect conversion process is constructed.

중국 석탄 가스화 기술 현황

허려화 ( Li Hua Xu ),유영돈 ( Young Don Yoo ),윤용승 ( Yong Seung Yun ),김형택 ( Hyung Taek Kim ) 한국공업화학회 2012 공업화학전망 Vol.15 No.1

중국 석탄 가스화 산업은 GE Energy, Shell 등과 같은 외국 기업들에 의해 최근까지 시장이 주도되었으나, 2000년대 후반부터는 중국 정부의 지원하에 대형 석탄 가스화 연구 개발 프로젝트가 진행되면서, 중국 석탄 가스화기술의 비약적인 발전과 더불어 점차 자국 기술의 시장 점유율을 높이고 있다. 특히, 자체 개발된 가스화기를 중국내에서 실증 과정을 통한 설계 및 운전 경험 확보를 통해 기존 선진국의 가스화 기술과 비교하여 경쟁력 있는 기술로의 발전을 꾀하고 있다. 2,000톤/일급 이상 처리가 가능한 대표적인 상업용 가스화기로는 습식가스화 기술인 OMB가스화기, 건식 가스화 기술인 TPRI 가스화기를 들 수 있다. OMB 가스화기의 경우, 25개 기업에서 72개의 가스화기가 운영 또는 건설되고 있고 메탄올과 같은 화학원료 제조 목적으로 사용되고 있다. 특히, 현재 건설 중인 미국 텍사스주 Valero에 2,500톤/일 규모의 5기의 가스화기로부터 수소를 생산하는 프로젝트에 OMB 가스화기를 적용하고 있으며, 2012년부터 건설 예정인 미국 펜실베니아주 Schuylkil County에 270 MW 규모의 IGCC 발전소에 TPRI 가스화기를 적용하는 것으로 발표되어, 중국 가스화 기술은 기존 미국이나 유럽의 가스화기 선진업체와 동등한 기술 수준에 도달된 것으로 판단된다.

중국 수소 생산 산업 및 정책 현황

허려화(Li-hua Xu),김형택(Hyung-taek Kim),유영돈(Young-don Yoo),강성균(Sung-kyun Kang) 한국에너지기후변화학회 2017 에너지기후변화학회지 Vol.12 No.1

With the rapid development of Chinas economy and the increasing dependence on oil and natural gas. Chinas energy security has encountered a great crisis. So China is trying to develop new renewable energy and reduce fossil energy and energy external dependence. China has developed many new renewable energy sources in order to improve air pollution and reduce greenhouse gas emissions. Hydrogen as a clean energy in the Chinese governments strong support has been a great development. China is now the worlds largest hydrogen producer. In China, coal is the largest source of hydrogen production. Followed by natural gas and refinery by-products. Since 2000, the Chinese government has increased investment in hydrogen energy production projects, Developed a variety of hydrogen production technology. Fuel cell and hydrogen energy is one of the important strategic plans of the Chinese government. During the 13.5 period, the new energy vehicle demonstration project was designated as the most important project. In this paper, the status of a variety of commercial scale hydrogen production industry and the status of hydrogen energy policy were investigated and analyzed.