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Novel Fault Diagnosis Scheme for HVDC System via ESO

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高电压技术 2007年第11期33卷 88-93页

作者： YAN bing-yong tian Zuo-hua SHI Song-jiao Department of Automation Shanghai Jiao Tong University Shanghai 200240 China

A novel fault detection and identification(FDI)scheme for HVDC(High Voltage Direct Current Transmission)system was *** was based on the unique active disturbance rejection concept,where the HVDC system faults were estimated using an extended states observer(ESO).Firstly,the mathematical model of HVDC system was constructed,where the system states and disturbance were treated as an extended *** augment HVDC system was established by using the extended state in rectify side and converter side,***,a fault diagnosis filter was established to diagnose the HVDC system faults via the ESO *** evolution of the extended state in the augment HVDC system can reflect the actual system faults and disturbances,which can be used for the fault diagnosis purpose.A novel feature of this approach is that it can simultaneously detect and identify the shape and magnitude of the HVDC faults and ***,different kinds of HVDC faults were simulated to illustrate the feasibility and effectiveness of the proposed ESO based FDI *** with the neural network based or support vector machine based FDI approach,the ESO based FDI scheme can reduce the fault detection time dramatically and track the actual system fault ***'s more important,it needs not do complex online calculations and the training of neural network so that it can be applied into practice.

关键词：高压直流输电系统故障检验与识别故障诊断分支状态观测器

dr1127:A novel gene of Deinococcus radiodurans responsible for oxidative stress

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Chinese Science Bulletin 2007年第15期52卷 2081-2087页

作者： WU YuanYuan tian bing HUA YueJint Institute of Nuclear-Agricultural Sciences Key Laboratory of Chinese Ministry of Agriculture for Nuclear-Agricultural SciencesZhejiang University Hangzhou 310029 China

The functional analysis of dr1127,a novel gene in Deinococcus radiodurans was performed in this pa-per. The dr1127 gene was found occasionally in our microarray and 2-DE gel experiments. Mutation of the dr1127 gene decreased the γ-radiation and H2O2 resistance of D. radiodurans,and weakened the scavenging abilities of cell extracts for free radicals (superoxide anion,hydrogen peroxide,and hy-droxyl radical). Further oxidative damage assays demonstrated that the purified DR1127 protein of D. radiodurans could bind to double stranded DNA in vitro and protect DNA from oxidative damage in this way. These results suggest that the dr1127 gene is an important gene that can maintain γ-radiation and oxidative resistance in D. radiodurans and may take part in the oxidative stress process.

关键词： dr1127 异常基因氧化损伤基因突变

Molecular Engineering of Novel Fluorophores for High-Contrast Bioimaging

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Chinese Journal of Chemistry 2022年第9期40卷 1073-1082页

作者： Shuai Xu Wenjing Pan tian-bing Ren Shuang-Yan Huan Lin Yuan Xiao-bing Zhang Molecular Science and Biomedicine Laboratory State Key Laboratory of Chemo/Biosensing and ChemometricsCollege of Chemistry and Chemical EngineeringCollaborative Innovation Center for Chemistry and Molecular MedicineHunan UniversityChangshaHunan 410082China

Fluorophores play a significant role in achieving high-contrast imaging in complex physiological ***,we present the results of our studies on the development of various fluorophores,such as anti-solvatochromic fluorophores,long wavelength emission two-photon fluorophores,large Stokes shift fluorophores and solid-state fluorophores,to achieve high-contrast bioimaging in physiological *** this study,we have primarily focused on the design,optical performance,imaging mechanisms,and the applications of these fluorophores with respect to complex physiological conditions.

关键词： Fluorescent probes Dyes Sensors Bioimaging Molecular engineering

Blunt myocardial injury and gastrointestinal hemorrhage following Heimlich maneuver:A case report and literature review

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World Journal of Emergency Medicine 2022年第3期13卷 248-250页

作者： Chu Wang Zhen-zhou Wang tian-bing Wang Trauma Medicine Center Peking University People's HospitalBeijing 100044China

Dear editor,In 1975,*** Heimlich introduced the Heimlich maneuver[2],which has become the initial treatment for emergency foreign-body airway *** is recommended by American Heart Association Guidelines for Cardiopulmonary Resuscitation and Emergency Cardiovascular Care.[2]During thrusts,airway pressure increases,thereby expelling foreign bodies.

关键词： airway obstruction gastrointestinal

A cleaner two-step synthesis of high purity diallyldimethylammonium chloride monomers for flocculant preparation

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Journal of Environmental Sciences 2005年第5期17卷 798-801页

作者： tian bing-hui FAN Bin PENG Xian-jia LUAN Zhao-kun State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental Sciences Chinese Academy of SciencesBeijing 100085 China

In order to improve the flocculation efficiency of polydiallyldimethylammonium chloride（PDADMAC）, high molecular weight PDADMAC should be prepared from high purity diallyldimethylammonium chloride（DADMAC） monomers. In this paper, a cleaner method with microwave irradiation and alkali solidification was proposed for preparing high pure DADMAC by selective heating under low temperature, and the prepared high purity DADMAC is characterized using FTIR and atomic absorption spectrometry. The new method provides a solution to the key technical problem of PDADMAC synthesis. Comparing with the conventional methods, the results showed that the advantages of the novel synthesis include：（a） high purity DADMAC is improved from 57% to 71% ; （b） reaction time of tertiary amine preparation is shortened from 6 h to 7 min; （c） water instead of acetone was used as reaction medium; （d） toxic by-products, wastewater and waste gas are eliminated. Flocculant made from the synthesized high purity DADMAC monomers was proved more efficient in flocculation tests.

关键词： diallyldimethylammonium chloride microwave irradiation flocculant cleaner process

Erectile dysfunction in nonmuscle-invasive bladder cancer patients before and after transurethral resection(TUR)of bladder tumor in China

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Asian Journal of Andrology 2022年第5期24卷 509-512页

作者： Peng Guo Yu Wang Yun-Feng Xie tian-bing Lv Department of Urology Neijiang First People’s HospitalNeijiang 641000China Department of Pathology Neijiang First People’s HospitalNeijiang 641000China

The aim of this study was to investigate the incidence of erectile dysfunction(ED)in nonmuscle-invasive bladder cancer(NMIBC)patients before and after transurethral resection(TUR)in *** data from 165 male patients with NMIBC who received adjuvant intravesical chemotherapy after TUR in Neijiang First People’s Hospital(Neijiang,China)between January 2010 and June 2019 were retrospectively *** sexual function of these patients was evaluated before and 1.5 years after initial TUR by the International Index of Erectile Function-5(IIEF-5).An age-specific subanalysis was performed among the patients:<45 years old(Group 1,n=19)and≥45 years old(Group 2,n=146).Before and 1.5 years after TUR,the incidence rates of ED in Group 1 were 15.8%and 52.6%,and those in Group 2 were 54.1%and 61.0%,*** difference between groups was statistically significant at the preoperative stage(15.8%vs 54.1%,P=0.002)but not at the postoperative stage(52.6%vs 61.0%,P=0.562).Compared with the preoperative stage,the incidence of ED at the postoperative stage was increased significantly in Group 1(15.8%vs 52.6%,P=0.017)but not in Group 2(54.1%vs 61.0%,P=0.345).In conclusion,the incidence of ED increased in male NMIBC patients under the age of 45 years after TUR in *** patients should be offered professional counseling during the follow-up period.

关键词： erectile dysfunction male sexual dysfunction nonmuscle-invasive bladder cancer transurethral resection

Martensitic transformation and magnetic properties of Ti-doped NiCoMnSn shape memory alloy

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Rare Metals 2014年第5期33卷 511-515页

作者： Feng Chen Yun-Xiang Tong bing tian Li Li Yu-Feng Zheng Center for Biomedical Materials and Engineering Harbin Engineering University Department of Materials Science and Engineering College of Engineering Peking University

Martensitic transformation, microstructure, and magnetic properties of Ti-doped Ni43-xTixCo7Mn43Sn7（at%）（x = 0, 0.5, 1.0, 2.0, and 4.0） shape memory alloys were investigated. The results show that transformation temperatures of Ni43Co7Mn43Sn7 can be efficiently adjusted by the substitution of Ti for Ni. For example, the martensitic transformation starting temperature（Ms） is reduced by about 278 K with 4 at% addition of Ti. Room temperature microstructure evolves from single tetragonal martensite for the Ti-free alloy to dual phases（tetragonal martensite ＋ second phase） with 0.5 at%, 1.0 at%, and2.0 at% addition of Ti to dual phases（cubic austenite ＋ second phase） for 4.0 at% Ti-doped alloy. The mechanical properties can be obviously improved by adding an appropriate amount of Ti. A noteworthy point is that magnetic-field-induced reverse transformation is observed in Ni39Ti4Co7Mn43Sn7 alloy.

关键词： NiCoMnSn Shape memory alloy Martensitic transformation Magnetic property

Diagenetic evolution and reservoir quality of the Oligocene sandstones in the Baiyun Sag, Pearl River Mouth Basin, South China Sea

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Acta Oceanologica Sinica 2024年第2期43卷 67-82页

作者： bing tian Shanshan Zuo Youwei Zheng Jie Zhang Jiayu Du Jun Tang Institute of Mining and Coal Inner Mongolia University of Science and TechnologyBaotou 014010China Institute of Science Inner Mongolia University of Science and TechnologyBaotou 014010China

The Oligocene Zhuhai sandstones are significant reservoirs for hydrocarbons in the Baiyun Sag, South China *** effective appraisal, exploration and exploitation of such a deep-water hydrocarbon sandstone, samples of five wells from depths of 850 m to 3 000 m were studied. A series of comprehensive petrographic and geochemical analyses were performed to unravel the diagenetic features and their impact on the reservoir ***, the sandstones are dominated by feldspathic litharenites and lithic arenites with fine to medium grain sizes and moderate to good sorting. The reservoir quality varies greatly with a range of porosity from 0.2% to 36.1% and permeability from 0.016 ×10~(–3) μm~2 to 4 301 ×10~(–3) μm~2, which is attributed to complex diagenetic evolution related to sedimentary facies;these include compaction, cementation of calcite, dolomite, siderite and framboidal pyrite in eogenetic stage;further compaction, feldspar dissolution, precipitation of ferrocalcite and ankerite, quartz cements, formation of kaolinite and its illitization, precipitation of albite and nodular pyrite, as well as hydrocarbon charge in mesogenetic stage. The dissolution of feldspar and illitization of kaolinite provide internal sources for the precipitation of quartz cement, while carbonate cements are derived from external sources related to interbedded mudstones and deep fluid. Compaction is the predominant factor in reducing the total porosity, followed by carbonate cementation that leads to strong heterogeneity. Feldspar dissolution and concomitant quartz and clay cementation barely changes the porosity but significantly reduces the *** high-quality reservoirs can be concluded as medium-grained sandstones lying in the central parts of thick underwater distributary channel sandbodies(>2 m) with a high content of detrital quartz but low cement.

关键词： Baiyun Sag Oligocene Zhuhai Formation diagenesis reservoir quality

Changes and significance of serum troponin in trauma patients: A retrospective study in a level I trauma center

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World Journal of Emergency Medicine 2022年第1期13卷 27-31页

作者： Li-wen Dou Zhe Du Ji-hong Zhu tian-bing Wang Emergency Department Peking University People’s HospitalBeijing 100044China Trauma Center Peking University People’s HospitalBeijing 100044China

BACKGROUND: Elevated troponin I(TnI) is common among trauma patients. TnI is an indicator of myocardial injury, but clinical diagnosis of blunt cardiac injury cannot be based solely on an increase in TnI. Therefore, this study aims to explore the changes and clinical significance of serum TnI in trauma patients. METHODS: The clinical data of consecutive trauma patients admitted to our trauma center between July 1, 2017 and July 31, 2020 were retrospectively analyzed. According to TnI levels within 24 hours of admission, patients were divided into the elevated and normal TnI groups. According to the TnI levels after 7 days of admission, a graph depicting a change in trend was drawn and then analyzed whether TnI was related to in-hospital mortality. RESULTS: A total of 166 patients(69 and 97 cases with elevated and normal TnI, respectively) were included in this study. The average hospital stay, intensive care time, mechanical ventilation time, and in-hospital mortality were higher in the elevated TnI group than in the normal TnI group(P<0.05). The TnI level of trauma patients gradually increased after admission and peaked at 48 hours(7.804±1.537 ng/mL). Subsequently, it decreased, and then recovered to normal within 7 days. However, 13 patients did not recover. Logistic regression analysis revealed that abnormal TnI at 7 days was independently related to in-hospital mortality. CONCLUSIONS: Trauma patients with elevated TnI levels may have a worse prognosis. Monitoring the changes in serum TnI is important, which can reflect the prognosis better than the TnI measured immediately after admission.

关键词： Trauma Blunt cardiac injury Troponin I Electrocardiography