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    题名 作者 年代 出处 被引量
1中性点有效接地配电网高阻接地故障特征分析及检测显示文摘中性点经小电阻等有效接地方式能有效地克服配电系统单相接地故障暂态过电压超标及故障选线不灵敏等问题,逐渐在城市配电网、大型厂矿企业电网中得到了推广应用;但这种运行方式仍然存在弧光接地等高阻接地故障正确动作率较低的问题。针对该问题,文中分析了高阻接地故障的特征,给出并验证了适用于配电网高阻故障检测的故障点电弧模型。针对现有方法中主要利用频域特征来检测高阻接地故障导致成功率低的缺点,提出了一种基于零序电流波形畸变凹凸性的高阻接地故障检测方法,仿真实验与现场试验数据验证了该算法的灵敏性和可靠性。耿建昭 王宾 董新洲 Bak DOMINIK 2013电力系统自动化2013,37,16:93
2Hepatolithiasis and intrahepatic cholangiocarcinoma: A review显示文摘Although the incidence of hepatolithiasis is decreasing as the pattern of gallstone disease changes in Asia, the prevalence of hepatolithiasis is persistently high, especially in Far Eastern countries. Hepatolithiasis is an established risk factor for cholangiocarcinoma(CCA), and chronic proliferative inflammation may be involved in biliary carcinogenesis and in inducing the upregulation of cell-proliferating factors. With the use of advanced imaging modalities, there has been much improvement in the management of hepatolithiasis and the diagnosis of hepatolithiasis-associated CCA(HLCCA). However, there are many problems in managing the strictures in hepatolithiasis and differentiating them from infiltrating types of CCA. Surgical resection is recommended in cases of single lobe hepatolithiasis with atrophy, uncontrolled stricture, symptom duration of more than 10 years, and long history of biliaryenteric anastomosis. Even after resection, patients should be followed with caution for development of HL-CCA, because HL-CCA is an independent prognostic factor for survival. It is not yet clear whether hepatic resection can reduce the occurrence of subsequent HL-CCA. Furthermore, there are no consistent findings regarding prediction of subsequent HL-CCA in patients with hepatolithiasis. In the management of hepatolithiasis, important factors are the reduction of recurrence of cholangitis and suspicion of unrecognized HL-CCA.Hyo Jung Kim Jae Seon Kim Moon Kyung Joo Beom Jae Lee Ji Hoon Kim Jong Eun Yeon Jong-Jae Park Kwan Soo Byun Young-Tae Bak 2015World Journal of Gastroenterology2015,21,48:63
3How good is cola for dissolution of gastric phytobezoars?显示文摘AIM:To evaluate the efficacy of cola treatment for gastric phytobezoars,including diospyrobezoars.METHODS:A total of 17 patients(range:48 to 78 years) with symptomatic gastric phytobezoars treated with cola and adjuvant endoscopic therapy were reviewed.Three liters of cola lavage(10 cases) or drink(7 cases) were initially used,and then endoscopic fragmentation was done for the remnant bezoars by using a lithotripsy basket or a polypectomy snare.The overall success of dissolving a gastric phytobezoars with using three liters of cola and the clinical and endoscopic findings were compared retrospectively between four cases of complete dissolution by using only cola and 13 cases of partial dissolution with cola.RESULTS:After 3 L of cola lavage or drinking,a complete dissolution of bezoars was achieved in four patients(23.5%),while 13 cases(76.5%) were only partially dissolved.Phytobezoars(4 of 6 cases) were observed more frequently than diospyrobezoars(0 of 11) in the group that underwent complete dissolution(P = 0.006).Gender,symptom duration,size of bezoar and method of cola administration were not significantly different between the two groups.Twelve of 13 patients with residual bezoars were completely treated with a combination of cola and endoscopic fragmentation.CONCLUSION:The rate of complete dissolution with three liters of cola was 23.5%,but no case of diospyrobezoar was completely dissolved using this method.However,pretreatment with cola may be helpful and facilitate endoscopic fragmentation of gastric phytobezoars.Beom Jae Lee Jong-Jae Park Hoon Jai Chun Ji Hoon Kim Jong Eun Yeon Yoon Tae Jeen Jae Seon Kim Kwan Soo Byun Sang Woo Lee Jae Hyun Choi Chang Duck Kim Ho Sang Ryu Young-Tae Bak 2009World Journal of Gastroenterology2009,15,18:22
4印度大停电与继电保护的三大功能显示文摘简介了印度电网在2012年7月30日和7月31日发生的两起大停电事故。两起事故均起源于同一回输电线路距离保护Ⅲ段因过负荷保护动作跳闸,并导致其他设备继电保护的不合理动作而引发连锁跳闸,造成大面积停电。印度大停电事故暴露了现有电力系统的脆弱性,尤其是继电保护在过负荷和系统振荡情况下的动作缺陷。基于对停电事故中继电保护行为的分析,提出了满足现代电网需求的继电保护三大功能:面向系统安全的系统保护功能、预防性保护功能和快速切除故障设备功能。董新洲 曹润彬 王宾 施慎行 Dominik Bak 2013电力系统保护与控制2013,41,2:23
5亚太地区胃食管反流病的处理共识:更新版显示文摘背景与目的:自从2004年亚太地区胃食管反流病(GERD)共识发表以来,更多关于GERD流行病学和处理的文献资料相继出现。有必要对这些资料进行循证综述,对共识作出更新。方法:由多学科专家组应用德尔菲(Delphi)法制定共识条文,提呈相关资料,并对证据质量、推荐力度和共识水平进行分级。结果:亚洲GERD发生率日益增加。其危险因素包括老年、男性、种族、家族史、社会经济地位高、体重指数增加和吸烟。对于有典型症状而无报警症状的患者,对质子泵抑制剂(PPI)试验有症状应答具有诊断意义。如PPI试验失败,停止治疗后pH监测结果阴性可排除GERD。窄带成像、胶囊内镜检查和无线pH监测的作用尚未明确。亚洲诊断策略的制定须考虑到并存的胃癌和消化性溃疡。减轻体质量和抬高床头可改善反流症状。PPIs是最有效的内科治疗手段。对于非糜烂性反流病(NERD)患者,按需治疗较为适宜。有慢性咳嗽、喉炎和典型GERD症状的患者在排除非GERD病因后,应予PPI每天两次治疗。如有经验丰富的外科医师,GERD患者可行胃底折叠术。除临床试验外,GERD不应采用内镜治疗。结论:新的诊断方法和内镜治疗的作用有待进一步研究阐明。亚洲GERD诊断策略的制定须考虑到并存的胃癌和消化性溃疡。PPIs仍为治疗的基石。Kwong Ming Fock Nicholas J Talley Ronnie Fass Khean Lee Goh Peter Katelaris Richard Hunt Michio Hongo Tiing Leong Ang Gerald Holtmann Sanjay Nandurkar San Ren Lin Benjamin CY Wong Francis KL Chan Abdul Aziz Rani Young-Tae Bak Jose Sollano Khek Yu Ho Sathoporn Manatsathit 钱本余 2008胃肠病学2008,13,7:21
6Traveling Wave Based Single-Phase-to-Ground Protection Method for Power Distribution System显示文摘Correct detection and identification of single-phase to-ground faults not effectively grounded in distribution systems is a major challenge for protection engineers.This paper proposes a novel traveling wave based protection method to solve this problem.The proposed method compares the polarities of current and voltage traveling waves measured immediately after the fault inception to determine the fault direction.Nuisance tripping is avoided by using the power frequency voltages detected on the busbar to inhibit operation.The power frequency voltages ensure that the system does not mal-operate due to noise and also provide discrimination for phase-to-phase and three-phase faults.The wavelet transform and modulus maxima theories are used to extract the polarity of traveling waves measured at the relaying point.The simulation studies demonstrate correct operation of protection,which is independent of fault distance,fault inception angle,fault path resistance,and the method used for neutral grounding.Xinzhou Dong Jun Wang Shenxing Shi Bin Wang Bak Dominik Miles Redfern 2015CSEE Journal of Power and Energy Systems2015,1,2:15
7基于无谐波检测和选择性谐波补偿原理的组合式同相供电系统控制策略显示文摘针对组合式同相供电系统同相补偿装置(CCD)的常规控制方法受负载电流检测精度影响严重,且不能良好跟踪高速铁路负载高次谐波电流的缺陷,提出一种选择性谐波电流控制策略。该控制策略仅需要保留CCD的两单相变流器输出电压、电流的检测部分,不需要检测负载电流;并通过矢量比例积分控制器对连接负载的单相变流器输出电流误差中的各次谐波单独跟踪。该设计方法不受负载电流检测精度的影响,对牵引负荷各个频段谐波都具有良好的跟踪性能。利用MATLAB/Simulink搭建组合式同相供电的常规控制模型、改进控制模型和基于改进控制策略的半桥四臂模块化多电平电路模型,对交-直型、交-直-交型、混跑3种负载分别进行控制,仿真验证了改进电流控制方法的正确性以及在实际工程实现中的有效性。王果 常文寰 Claus Leth Bak 周末 郝泽宇 2017电力自动化设备2017,37,12:13
8Characteristics of Early Eocene radiolarian assemblages of the Saga area,southern Tibet and their constraint on the closure history of the Tethys显示文摘Quantitative analysis of Early Eocene radiolarian assemblages discovered in the sedimentary mélange (accretionary prism) of the Saga area,southern Tibet provides new information to constrain the timing of Tethys closure and the initial collision of India and Eurasia. The radiolarian species of Saga include Amphisphaera coronata (Ehrenberg),Buryella hannae Bak & Barwicz-Piskorz,Buryella clinata Foreman,Buryella tetradica Foreman,Calocycloma ampulla (Ehrenberg),Lamptonium fabaeforme constrictum Riedel and Sanfilippo,Lamptonium pennatum Foreman,Lithomespilus coronatus Squinabol and Lamptonium (?) colymbus Foreman. The adequate and reliable correlation of these radiolarians specimens indicates that the assemblage is of Early Eocene in age. The age and depositional envi-ronment of these radiolarians testify that deep ocean basins existed between India Plate and Asia Plate during the Early Eocene. The complete closure of Tethys must have taken place at least after the Early Eocene.LI YaLin WANG ChengShan HU XiuMian M. Bak WANG JinJun CHEN Lei 2007Chinese Science Bulletin2007,52,15:9
9Developmentally Regulated Glucosylation of Bitter Triterpenoid in Cucumber by the UDP-Glucosyltransferase UGT73AM3显示文摘Yang Zhong Xiaofeng Xue Zhiqiang Liu Yongshuo Ma Kewu Zeng Lida Han Jingjing Qi Dae-Kyun Ro Soren Bak Sanwen Huang Yuan Zhou Yi Shang 2017Molecular Plant2017,10,7:7
10BCI induces apoptosis via generation of reactive oxygen species and activation of intrinsic mitochondrial pathway in H1299 lung cancer cells显示文摘The compound(E)-2-benzylidene-3-(cyclohexylamino)-2,3-dihydro-1 H-inden-1-one(BCI) is known as an inhibitor of dual specific phosphatase 1/6 and mitogen-activated protein kinase. However, its precise anti-lung cancer mechanism remains unknown. In this study, the effects of BCI on the viability of non-small cell lung cancer cell lines NCI-H1299, A549, and NCI-H460 were evaluated. We confirmed that BCI significantly inhibited the viability of p53(-) NCI-H1299 cells as compared to NCI-H460 and A549 cells, which express wild-type p53. Furthermore, BCI treatment increased the level of cellular reactive oxygen species and pre-treatment of cells with N-acetylcysteine markedly attenuated BCI-mediated apoptosis of NCI-H1299 cells. BCI induced cellular morphological changes, inhibited viability, and produced reactive oxygen species in NCI-H1299 cells in a dose-dependent manner. BCI induced processing of caspase-9, caspase-3, and poly ADP-ribose polymerase as well as the release of cytochrome c from the mitochondria into the cytosol. In addition, BCI downregulated Bcl-2 expression and enhanced Bax expression in a dose-dependent manner in NCI-H1299 cells. However, BCI failed to modulate the expression of the death receptor and extrinsic factor caspase-8 and Bid, a linker between the intrinsic and extrinsic apoptotic pathways in NCI-H1299 cells. Thus, BCI induces apoptosis via generation of reactive oxygen species and activation of the intrinsic pathway in NCI-H1299 cells.Jong-Woon Shin Sae-Bom Kwon Yesol Bak Sang-Ku Lee Do-Young Yoon 2018Science China(Life Sciences)2018,61,10:7
11Usefulness of CA 19–9 for pancreatic cancer screening in patients with new-onset diabetes显示文摘Background: Generally, carbohydrate antigen 19–9(CA 19–9) is not useful for screening pancreatic cancer in the asymptomatic general population. This study aimed to evaluate the utility of CA 19–9 level as a screening indicator of pancreatic cancer in asymptomatic patients with new-onset diabetes.Methods: We retrospectively reviewed the medical records of patients who visited our health promotion center for health check-ups without cancer related symptoms from January 2005 to January 2014, and were newly diagnosed with diabetes mellitus(DM) within 2 years before their visit.Results: Of the 5111 asymptomatic patients with new-onset DM(<2 years) selected for analyses, 87(1.7%) eventually developed pancreatic cancer after the health check-up. In the subgroup of 322 patients with high total bilirubin levels(>1.7 mg/d L) at the screening time, 42(73.7%) of 57 patients with high CA19–9 levels(>37 IU/m L) had been diagnosed as pancreatic cancer during follow-up period and 12(4.5%)of 265 patients with normal CA 19–9 levels had finally developed pancreatic cancer(OR = 16.3). In the subgroup of 4789 patients with normal bilirubin levels, pancreatic cancer had been detected in 20(3.8%)of 522 patients with high CA 19–9 level, while only 13(0.3%) in 4267 patients with normal CA 19–9 levels(OR = 12.6), respectively.Conclusion: CA 19–9 levels after a diagnosis of new-onset DM could be a useful biomarker of pancreatic cancer, especially in patients with high serum bilirubin.Jung Wan Choe Hyo Jung Kim Jae Seon Kim Jaehyung Cha Moon Kyung Joo Beom Jae Lee Jong-Jae Park Young-Tae Bak 2018Hepatobiliary & Pancreatic Diseases International2018,17,3:6
12轨道尺度的亚洲夏季风演变:“困惑”与探索显示文摘亚洲夏季风影响着亚洲大陆数十亿人口.半个世纪以来,亚洲夏季风研究取得了许多重要成就,但一些科学问题依然有待深入探索.这其中包括轨道时间尺度的两个难题:(1)中国黄土的磁化率序列显示亚洲夏季风变化以冰期-间冰期~100kyr周期为主,而中国石笋氧同位素(δ18O)序列则以~20kyr岁差周期为主,两者主导周期的差异成为了悬而未决的'中国的100kyr周期问题';(2)亚洲大陆石笋δ18O序列与许多海洋沉积记录在岁差波段上的显著相位差异,是争议已久的'海-陆岁差相位的困惑'.应当如何解答这些难题呢?首先,伴随着轨道尺度数值模拟的不断发展,岁差波段上降水量和风场变化在亚洲夏季风广大区域中的不均匀性及其区域模态差异逐渐明朗,不同气候记录的分歧在很大程度上可能只是这种降水和风场空间不均一性的体现.其次,不同记录载体有其固有的优势和局限,而此间差异则部分反映了这些局限性.总体而言,亚洲夏季风的黄土、海洋和石笋记录之间并不存在相互否定的关系,而是具有互补性;它们各自刻画了亚洲夏季风动力学系统的不同方面.因此,从整体季风系统的视角审视这些记录,能够基本解释亚洲季风的'中国的100kyr周期问题'和'海-陆岁差相位的困惑'这两个科学难题.程海 张海伟 蔡演军 石正国 易亮 邓成龙 郝青振 彭友兵 Ashish SINH A 李瀚瑛 赵景耀 田野 Jonathan BAK ER Carlos PEREZ-M EJIAS 2021中国科学:地球科学2021,51,4:6
13极化电流行波方向继电器在带并联电抗器输电线上的特性显示文摘由于传统的光纤电流差动保护无法直接应用于带并联电抗器的输电线路,均需要进行补偿。基于极化电流行波方向继电器应用于带并联电抗器的线路,文中深入分析了并联电抗器上的行波过程、传输频域分析以及对基于小波变换的极化电流行波方向继电器的影响。结果表明,带并联电抗器的线路不会影响暂态行波波头的方向,同时也不会影响工频行波波头的提取。因此,基于极化电流行波方向继电器的保护能够直接适用于带有并联电抗器的线路。电磁暂态程序(EMTP)的仿真和实际装置的测试结果均表明了该保护在带并联电抗器线路上的优良特性。任立 董新洲 施慎行 王宾 Dominik BAK 2013电力系统自动化2013,37,21:6
14Sorption of lanthanide ions on biochar composites显示文摘Sorption of lanthanum(Ⅲ), cerium(Ⅲ) and neodymium(Ⅲ) ions from the aqueous solutions of mixtures through adsorption on the biochar composites was investigated as a function of sorbent mass, pH, phase contact time and initial concentration of solutions at 295 K. The maximum removal of lanthanide ions takes place under the following conditions: 0.1 g of sorbent mass, pH 4 and 360 min contact time for all studied initial concentrations of solutions. Kinetics of La(Ⅲ), Ce(Ⅲ) and Nd(Ⅲ) ions sorption proceeded by a fast initial uptake reached equilibrium. This process was modelled by means of the pseudo first order, pseudo second order, intraparticle diffusion and Elovich models. The desorption of three lanthanide ions by nitric, hydrochloric and sulfuric acids at a concentration of 1 mol/L from biochar composites was also studied. In order to investigate the sorption mechanism FTIR, XRD and XPS analyses were performed after sorption of ions from the mixture.Dorota Kotodyniska Justyna Bak Malwina Majdariska Dominika Fila 2018Journal of Rare Earths2018,36,11:6
15多相补偿距离继电器在振荡且伴随单相接地故障下的动作性能分析显示文摘被广泛应用于电力系统的距离保护多采用阻抗距离继电器为核心元件。阻抗距离继电器受系统振荡影响,需配合振荡闭锁元件构成保护,使得距离保护变得复杂。以多相补偿距离继电器为核心的距离保护能够防止振荡对距离保护的影响而无需时间闭锁元件。因此,对多相补偿距离继电器动作特性进行深入分析是十分必要的。通过分析多相补偿距离继电器的动作判据,给出了多相补偿距离继电器包含的3个元件在系统振荡且发生单相接地故障情况下的动作特性,包括反映故障相元件的拒动范围和反映非故障相元件的误动范围,并指出了其在构成距离保护II段、III段时的不足。PSCAD仿真结果验证了所得结论。崔柳 董新洲 施慎行 王宾 DOMINIK Bak 2013中国电机工程学报2013,33,34:6
16数字化集成保护控制系统的实现方案显示文摘变电站数字化、智能化为站域信息共享提供了技术保障,因此开发了一种新型数字化集成保护控制(DIPC)系统。系统主要由设备层智能终端(IT)、合并单元(MU)和系统层多功能保护控制器(MPCU)三大核心部分构成,分别给出了它们的硬件架构和软件设计方案。该系统基于IEC61850标准,采用两级相量计算和保护起动判据,提高了保护的快速性和可靠性。测试结果表明,该系统可对故障作出快速、可靠的反应,其集成通信和运算能力满足保护跳闸的要求。曹润彬 董新洲 王宾 施慎行 BAK Dominik 何世恩 孙辰军 2014电力自动化设备2014,34,5:5
17Antiviral efficacy of adefovir dipivoxil versus lamivudine in patients with chronic hepatitis B sequentially treated with lamivudine and adefovir due to lamivudine resistance显示文摘AIM: To compare the antiviral efficacy of adefovir (ADV) in lamivudine (LMV)-resistant patients with LMV treatment in nucleoside-naive patients, using serum samples collected sequentially during the course of treatment progressing from LMV to ADV METHODS: Forty-four patients with chronic hepatitis B (CHB) were included. The patients were initially treated with LMV and then switched to ADV when LMV resistance developed. Antiviral efficacy was assessed by measuring the following: reduction in serum HBV DNA from baseline, HBV DNA negative conversion (defined as HBV DNA being undectable by the hybridization assay), and HBV DNA response (either HBV DNA level ≤ 105 copies/mL or a ≥ 2 logio reduction from baseline HBV DNA level). RESULTS: After two and six months of treatment, HBV DNA reduction was greater with LMV compared to ADV treatment (P = 0.021). HBV DNA negative conversion rates were 64% and 27% after one month of LMV and ADV treatment respectively (P = 0.001). Similarly, HBV DNA response rates were 74% and 51% after two months of LMV and ADV treatment respectively (P = 0.026). The time taken to HBV DNA negative conversion and to HBV DNA response were both delayed in ADV treatment compared with LMV. CONCLUSION: The antiviral efficacy of ADV in LMV-resistant patients is slower and less potent than that with LMV in nucleoside-naive patients during the early course of treatment.Yeon Seok Seo Ji Hoon Kim Jong Eun Yeon Jong-Jae Park Jae Seon Kim Kwan Soo Byun Young-Tae Bak Chang Hong Lee 2007World Journal of Gastroenterology2007,13,30:4
18现代电力系统集成后备保护方案显示文摘后备保护不可或缺,特别作为相邻设备的远后备保护功能尤为重要。由于距离保护仅仅依赖本地信息构成,容易实现且性能稳定,因此,所有高压输电线路都把距离保护作为后备保护。遗憾的是,后备保护在大停电过程中所起的作用是消极的,可以说它导致了电网连锁跳闸。因此,有必要重新认识后备保护的作用及其构成方式。提出了一种集成后备保护方案,它把同一个变电站所有被保护设备的后备保护集成在一个装置或者系统中,而所有设备的保护只包含主保护功能。这样的方案有利于构成性能完善的后备保护方案,也可以有效减小大停电的范围。董新洲 曹润彬 崔柳 王宾 施慎行 Dominik Bak Brian Kirby 杨霞 2014电力系统保护与控制2014,42,5:4
19MicroRNA-31 functions as an oncogenic microRNA in mouse and human lung cancer cells by repressing specific tumor suppressors显示文摘Liu Xi Sempere Lorenzo F Ouyang Haoxu Memoli Vincent A Andrew Angeline S Luo Yue Demidenko Eugene Korc Murray Shi Wei Preis Meir Dragnev Konstantin H Li Hua DiRenzo James Bak Mads Freemantle Sarah J Kauppinen Sakari Dmitrovsky Ethan 2010Journal of Clinical Investigation2010,,4:3
20New method for applying solar energy in greenhouses to reduce fuel consumption显示文摘Renewable energies(especially solar energy)are globally suitable alternatives for fossil fuels.On the other hand,greenhouses,as a main part of agriculture industry,use a significant amount of fossil fuels annually to provide the required heat for the under-cultivation crops in the greenhouse.Currently this heat demand is provided by a heater which burns gas oil as its main fuel.The main problem with these heaters is fuel hyper-consumption.That is why feasibility of utilizing a solar energy storage system in greenhouses is studied here.As the low temperature heat is required for preheating the air in the greenhouse,a solar collector array is proposed to be utilized in order to displace heating demand of the heater and to reduce amount of fuel consumption.To evaluate the proposed system effectiveness,an economic survey has been done on the proposed system based on Net Present Value(NPV)method.The optimum capital cost for the project is found based on economic methods.The economic analysis showed that 85 flat plate collector modules and an 8.5 cubic meters of storage tank are optimum selection of the project.The results showed that,by employing the proposed system,7735 USD benefit as well as 11050 litres of fuel providence is obtainable annually.Economic evaluation based on NPV method resulted in the payback period of ten years.Mahmood Farzaneh-Gord Ahmad Arabkoohsar Mahdi Deymi Dashte Bayaz Abdolamir Bak Khoshnevis 2013International Journal of Agricultural and Biological Engineering2013,6,4:3
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