|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | 二维传声器阵列测量技术及其对飞机进场着陆过程噪声的实验研究显示文摘发展了一种由111个传声器组成的M维平面传声器阵列测量技术,111个传声器在平面阵列中的位置应用随机优化的方法确定,从而保证平面传声器阵列在感兴趣的测量频率范围内具有理想的性能,并应用数值模拟的方法检验了平面传声器阵列的频谱特性.应用此平面传声器阵列对当前流行的民用客机进场着陆过程中飞机噪声源进行了测量分析,实验结果表明应用此项技术可以辨别出在飞机表面上所有重要的噪声源,并可获得全尺寸飞机机体重要噪声源的详细的频谱特性、指向特性和声级变化. | 乔渭阳 Ulf Michel | 2001 | 声学学报2001，26，2： | 35 |
| 2 | Hepatic steatosis is associated with an increased risk of carotid atherosclerosis显示文摘AIM: Although an association between helatic steatosis and vascular risk factors has been described, direct relationships between fatty liver and atherosclerosis have not yet been investigated. The aim of the present study has been to investigate those relationships.METHODS: The Study of Health in Pomerania examined a random population sample aged between 20 and 79 years.A study population of 4 222 subjects without hepatitis B and C infections and without liver cirrhosis was available for the present analysis. Hepatic steatosis was defined sonographically and intima-media thickness (IMT) as well as plaque prevalence were estimated by carotid ultrasound.RESULTS: The prevalence rate of hepatic steatosis was 29.9%. Among subjects aged ≥45 years, an association between hepatic steatosis and IMT of the carotid arteries was found in bivariate analysis, but not after adjustment for atherosclerotic risk factors. Individuals with fatty liver had more often carotid plaques than persons without fatty liver (plaque prevalence rate 76.8% vs 66.6%; P<0.001).This association persisted after adjustment for confounding factors and was predominantly present in subjects with no to mild alcohol consumption.CONCLUSION: There is an independent association between hepatic steatosis and carotid atherosclerotic plaques. Metabolic changes due to nonalcoholic fatty liver disease may explain this relationship. | Henry V(o|¨)lzke Daniel M.Robinson Volker Kleine Roland Deutscher Wolfgang Hoffmann Jan Lüdemann Ulf Schminke Christof Kessler Ulrich John | 2005 | World Journal of Gastroenterology2005，11，12： | 29 |
| 3 | Effect of particle shape and size on flow properties of lactose powders显示文摘The shape and size of particles are understood to affect the bulk behaviour of powders, though there are but few studies that present quantitative information on the relationship between particle shape and the flow properties of powder. This is due in part to the lack of techniques for rapidly determining both particle shape and the range of flow characteristics that describe the response of powders to the stress and shear experienced during their processing. This study presents data that quantifies the influence of particle shape/size of three different lactose powders on their respective flow and bulk characteristics. Two of the samples differ in size but have similar shapes; the third sample is more spherical but similar in size to one of the other two samples. The results demonstrate that in addition to particle size, particle shape significantly affect the flow characteristics of a powder over a wide range of stress conditions. | Xiaowei Fu Deborah Huck Lisa Makein Brian Armstrong Ulf Willen Tim Freeman | 2012 | Particuology2012，10，2： | 22 |
| 4 | Regulation of HMGB1 release by infl ammasomes显示文摘High mobility group box 1(HMGB1)is an evolutionarily conserved non-histone chromatin-binding protein.During infection or injury,activated immune cells and damaged cells release HMGB1 into the extracellular space,where HMGB1 functions as a proinflammatory mediator and contributes importantly to the pathogenesis of inflammatory diseases.Recent studies reveal that infl ammasomes,intracellular protein complexes,critically regulate HMGB1 release from activated immune cells in response to a variety of exogenous and endogenous danger signals.Double stranded RNA dependent kinase(PKR),an intracellular danger-sensing molecule,physically interacts with inflammasome components and is important for infl ammasome activation and HMGB1 release.Together,these studies not only unravel novel mechanisms of HMGB1 release during infl ammation,but also provide potential therapeutic targets to treat HMGB1-related infl ammatory diseases. | Ben Lu Haichao Wang Ulf Andersson Kevin J.Tracey | 2013 | Protein & Cell2013，4，3： | 21 |
| 5 | 基于传声器阵列过顶测量结果的飞机起落架噪声研究显示文摘应用由111个传声器组成的平面传声器阵列对当前流行的民用客机进场着陆过程中的机体噪声源进行了实验测量,本文对七架窄体客机和七架宽体客机的起落架噪声进行了分析,得到了起落架噪声的频谱特性、指向特性和声级变化.研究发现,起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成,起落架噪声的指向性类似于一个水平放置的偶极子.不同飞机起落架噪声的声级相差较大,这说明可以通过重新结构设计降低起落架噪声. | 乔渭阳 Ulf Michel | 2001 | 应用声学2001，20，2： | 15 |
| 6 | Biliary complications in liver transplantation: Impact of anastomotic technique and ischemic time on short- and long-term outcome显示文摘AIM: To elucidate the impact of various donor recipient and transplant factors on the development of biliary complications after liver transplantation.METHODS: We retrospectively reviewed 200 patients of our newly established liver transplantation(LT) program, who received full size liver graft. Biliary reconstruction was performed by side-to-side(SS), end-to-end(EE) anastomosis or hepeaticojejunostomy(HJ). Biliary complications(BC), anastomotic stenosis, bile leak, papillary stenosis, biliary drain complication, ischemic type biliary lesion(ITBL) were evaluated by studying patient records, corresponding radiologic imaging and reports of interventional procedures [e.g., endoscopic retrograde cholangiopancreatography(ERCP)]. Laboratory results included alanine aminotransferase(ALT), gammaglutamyltransferase and direct/indirect bilirubin with focus on the first and fifth postoperative day, six weeks after LT. The routinely employed external bile drain was examined by a routine cholangiography on the fifth postoperative day and six weeks after transplantation as a standard procedure, but also whenever clinically indicated. If necessary, interventional(e.g., ERCP) or surgical therapy was performed. In case of biliary complication, patients were selected, assigned to different complication-groups and subsequently reviewed in detail. To evaluate the patients outcome, we focussed on appearance of postoperative/post-interventional cholangitis, need for rehospitalisation, retransplantation, ITBL or death caused by BC.RESULTS: A total of 200 patients [age: 56(19-72), alcoholic cirrhosis: n = 64(32%), hepatocellular carcinoma: n = 40(20%), acute liver failure: n = 23(11.5%), cryptogenic cirrhosis: n = 22(11%), hepatitis B virus /hepatitis C virus cirrhosis: n = 13(6.5%), primary sclerosing cholangitis: n = 13(6.5%), others: n = 25(12.5%) were included. The median follow-up was 27 mo until June 2015. The overall biliary complication rate was 37.5%(n = 75) with anastomotic strictures(AS): n = 38(19%), bile leak(BL): n = 12(6%), biliary drain complication: n = 12(6%); papillary stenosis(PS): n = 7(3.5%), ITBL: n = 6(3%). Clinically relevant were only 19%(n = 38). We established a comprehensive classification for AS with four grades according to clinical relevance. The reconstruction techniques [SS: n = 164, EE: n = 18, HJ: n = 18] showed no significant impact on the development of BCs in general(all n < 0.05), whereas in the HJ group significantly less AS were found(P = 0.031). The length of donor intensive care unit stay over 6 d had a significant influence on BC development(P = 0.007, HR = 2.85; 95%CI: 1.33-6.08) in the binary logistic regression model, whereas other reviewed variables had not [warm ischemic time > 45 min(P = 0.543), cold ischemic time > 10 h(P = 0.114), ALT init > 1500 U/L(P = 0.631), bilirubin init > 5 mg/d L(P = 0.595), donor age > 65(P = 0.244), donor sex(P = 0.068), rescue organ(P = 0.971)]. 13%(n = 10) of BCs had no therapeutic consequences, 36%(n = 27) resulted in repeated lab control, 40%(n = 30) received ERCP and 11%(n = 8) surgical therapy. Fifteen(7.5%) patients developed cholangitis [AS(n = 6), ITBL(n = 5), PS(n = 3), biliary lesion BL(n = 1)]. One patient developed ITBL twelve months after LT and subsequently needed retransplantation. Rehospitalisation rate was 10.5 %(n = 21) [AS(n = 11), ITBL(n = 5), PS(n = 3), BL(n = 1)] with intervention or reinterventional therapy as main reasons. Retransplantation was performed in 5(2.5%) patients [ITBL(n = 1), acute liver injury(ALI) by organ rejection(n = 3), ALI by occlusion of hepatic artery(n = 1)]. In total 21(10.5%) patients died within the follow-up period. Out of these, one patient with AS developed severe fatal chologenic sepsis after ERCP.CONCLUSION: In our data biliary reconstruction technique and ischemic times seem to have little impact on the development of BCs. | Stefan Kienlein Wenzel Schoening Anne Andert Daniela Kroy Ulf Peter Neumann Maximilian Schmeding | 2015 | World Journal of Transplantation2015，5，4： | 14 |
| 7 | Asymmetrically hypointense veins on T2~*w imaging and susceptibility-weighted imaging in ischemic stroke显示文摘AIM:To review the literature on the assessment of venous vessels to estimate the penumbra on T2*w imaging and susceptibility-weighted imaging (SWI). METHODS:Literature that reported on the assessment of penumbra by T2*w imaging or SWI and used a validation method was included. PubMed and relevant stroke and magnetic resonance imaging (MRI) related conference abstracts were searched. Abstracts that had overlapping content with full text articles were excluded. The retrieved literature was scanned for further relevant references. Only clinical literature published in English was considered, patients with Moya-Moya syndrome were disregarded. Data is given as cumulative absolute and relative values, ranges are given where appropriate. RESULTS:Forty-three publications including 1145 patients could be identified. T2*w imaging was used in 16 publications (627 patients), SWI in 26 publications (453 patients). Only one publication used both (65 patients). The cumulative presence of hypointense vessel sign was 54% (range 32%-100%) for T2* (668 patients) and 81% (range 34%-100%) for SWI (334 patients). There was rare mentioning of interrater agreement (6 publications, 210 patients) and reliability (1 publication, 20 patients) but the numbers reported ranged from good to excellent. In most publications (n = 22) perfusion MRI was used as a validation method (617 patients). More patients were scanned in the subacute than in the acute phase (596 patients vs 320 patients). Clinical outcome was reported in 13 publications (521 patients) but was not consistent. CONCLUSION:The low presence of vessels signs on T2*w imaging makes SWI much more promising. More research is needed to obtain formal validation and quantification. | Ulf Jensen-Kondering Ruwen Bhm | 2013 | World Journal of Radiology2013，5，4： | 14 |
| 8 | 打造“深绿型”生态城市——唐山曹妃甸国际生态城概念性总体规划显示文摘介绍唐山曹妃甸国际生态城一期30km2的可持续发展战略规划和物质空间概念性总体规划成果,并介绍该概念性总体规划的整合土地利用、交通、绿化和水景规划,整合的能源、垃圾和水资源的资源管理模式等主要特色,以及SWECO为曹妃甸制定的可持续发展指导原则和生态城指标体系。 | 刘小波 谭英 Ulf Ranhagen | 2009 | 建筑学报2009，，5： | 13 |
| 9 | Prognostic value of site-specific metastases in pancreatic adenocarcinoma: A Surveillance Epidemiology and End Results database analysis显示文摘AIM To evaluate the prognostic value of site-specific metastases among patients with metastatic pancreaticc arcinoma registered within the Surveillance, Epidemiology and End Results(SEER) database.METHODS SEER database(2010-2013) has been queried through SEER*Stat program to determine the presentation, treatment outcomes and prognostic outcomes of metastatic pancreatic adenocarcinoma according to the site of metastasis. In this study, metastatic pancreatic adenocarcinoma patients were classified according to the site of metastases(liver, lung, bone, brain and distant lymph nodes). We utilized chi-square test to compare the clinicopathological characteristics among different sites of metastases. We used Kaplan-Meier analysis and log-rank testing for survival comparisons. We employed Cox proportional model to perform multivariate analyses of the patient population; and accordingly hazard ratios with corresponding 95%CI were generated. Statistical significance was considered if a two-tailed P value < 0.05 was achieved. RESULTS A total of 13233 patients with stage Ⅳ pancreatic cancer and known sites of distant metastases were identified in the period from 2010-2013 and they were included into the current analysis. Patients with isolated distant nodal involvement or lung metastases have better overall and pancreatic cancer-specific survival compared to patients with isolated liver metastases(for overall survival: lung vs liver metastases: P < 0.0001; distant nodal vs liver metastases: P < 0.0001)(for pancreatic cancer-specific survival: lung vs liver metastases: P < 0.0001; distant nodal vs liver metastases: P < 0.0001). Multivariate analysis revealed that age < 65 years, white race, being married, female gender; surgery to the primary tumor and surgery to the metastatic disease were associated with better overall survival and pancreatic cancer-specific survival.CONCLUSION Pancreatic adenocarcinoma patients with isolated liver metastases have worse outcomes compared to patients with isolated lung or distant nodal metastases. Further research is needed to identify the highly selected subset of patients who may benefit from local treatment of the primary tumor and/or metastatic disease. | Hani Oweira Ulf Petrausch Daniel Helbling Jan Schmidt Meinrad Mannhart Arianeb Mehrabi Othmar Schob Anwar Giryes Michael Decker Omar Abdel-Rahman | 2017 | World Journal of Gastroenterology2017，23，10： | 13 |
| 10 | Extended surgical resection for xanthogranulomatous cholecystitis mimicking advanced gallbladder carcinoma: A case report and review of literature显示文摘Xanthogranulomatous 胆汁(XGC ) 是胆囊的破坏煽动性的疾病,很少包含邻近的机关并且模仿国王先进胆囊癌。诊断在病理学的检查以后仅仅通常是可能的。46 42 岁的女人被指我们包含肝核,正确的肝脑叶,恰好结肠的弯曲,和十二指肠的怀疑的胆囊癌症的中心。刷细胞学获得了由内视镜后退胆管造影术(ERC ) 出现了高级发育异常。病人经历了团的在团体切除术,由正确叶切除术,正确的半结肠切除术,和部分十二指肠的切除术组成。出人意料地揭示的病理学的检查一 XGC.Only,为有邻近的机关的直接参与的 XGC 的扩大外科的切除术的六个案例到目前为止被报导了。在这些情况中,与癌给 XGC 的可能的共存,恶意不能被排除,甚至在细胞学和 intraoperative 冰冻切片调查以后。在结论,由于源于在另外的方面上包围机关的高度好攻击的煽动性的侵略的一个方面和可能的复杂并发症上的胆囊癌的差的预后,它似乎这些案例应该被当作恶性瘤直到不那样证明。临床医生们应该包括 XGC 在之中可能微分在肝核群众诊断。 | Antonino Spinelli Guido Schumacher Andreas Pascher Enrique Lopez-Hanninen Hussain Al-Abadi Christoph Benckert Igor M Sauer Johann Pratschke Ulf P Neumann Sven Jonas Jan M Langrehr Peter Neuhaus | 2006 | World Journal of Gastroenterology2006，12，14： | 13 |
| 11 | 交联聚乙烯电力电缆的介电损耗机理(英文)显示文摘基于电介质物理学经典理论及其在聚合物绝缘材料上的最新发展,阐述绝缘材料的介质损耗机理以及交联聚乙烯电力电缆介电损耗的最新研究进展。通过大量的试验研究,结合等效电路法和微观理论分析,发现了交联聚乙烯电力电缆绝缘系统中在不同频率时起主要作用的3种不同类型的介电损耗,且这些介电损耗共同造成了50 Hz频率电力电缆系统的介电损耗。这一新发现可以帮助电缆制造商提高生产技术,有助于电气工程师更好地了解电力电缆绝缘系统,从而可能减少电力电缆的介电损耗和增加其寿命。 | 刘通 John Fothergill Steve Dodd Ulf Nilsson | 2010 | 南方电网技术2010，4，5： | 11 |
| 12 | 高性能粉末冶金材料发展及其解决方案显示文摘与其它制造技术相比,粉末冶金技术可以更经济和高效地生产结构部件,并能达到高的尺寸精度和性能需求,这一优势一直驱动着粉末冶金技术的发展。粉末冶金技术为了能够适应汽车工业不断发展的应用需求,迫切需要开发具有更高尺寸精度、更高性能以及经济高效的粉末冶金材料解决方案,粉末冶金技术可以通过不同的工艺路径来实现这一目标。例如开发经济的新型合金体系,实现更高密度的新型压制技术,结合高温烧结和快速冷却的烧结工艺,以及碳势控制和二次热处理等工艺,都是可行的解决方案,单独或组合采用这些工艺都可以提高材料性能。随着人们对可持续发展越来越重视,选择对环境影响最小的材料和制造工艺变得尤为重要。本文探讨了满足性能要求的金属粉末方案和工艺条件等关键因素,并列举了具有成本效益和可持续性的汽车应用案例,如同步轮毂,凸轮轴桃片,链轮,齿轮等高要求的应用。 | 谭兆强 Ulf Engström 苏鹏飞 李昆 刘咏 | 2020 | 粉末冶金工业2020，30，3： | 10 |
| 13 | Correction to“Asymmetrically hypointense veins on T2*w imaging and susceptibility-weighted imaging in ischemic stroke”[World J Radiol 2013;5(4):156-165]显示文摘Correction to:Jensen-Kondering U,B?hm R.Asymmetrically hypointense veins on T2*w imaging and susceptibility-weighted imaging in ischemic stroke.World J Radiol 2013;5(4):156-165 PMID:23671751 DOI:10.4329/wjr.v5.i4.156[1].Results Third paragraph:(1)(n=17441 patients)should read(n=441 patients)instead;(2)(n=4111 patients)should read(n=111 patients)instead.Fourth paragraph:(1)(>6 h,n=15579 patients)should read(>6 h,n=579 patients)instead;(2)(≤6 h=11337 patients)should read(≤6 h=337 patients)instead;(3)(170 patients)should read(180 patients)instead. | Ulf Jensen-Kondering Ruwen Bohm | 2018 | World Journal of Radiology2018，10，1： | 8 |
| 14 | 基于改进的传声器阵列数据分析技术的飞机机体噪声实验研究显示文摘发展了一种平面传声器阵列数据处理新方法——洁净信号处理算法,通过对传声器阵列混淆和旁瓣信号的有效抑制,改进了对声源的分辨。基于改进的数据分析方法,研究了真实飞机结构和真实飞行条件下飞机起落架、襟翼等声源的频谱特性、指向特性。研究结果表明,新的信号处理算法可以更加清晰地分离出飞机表面的气动噪声源。起落架噪声的频谱是由宽频随机噪声与一些较为明显的单音噪声源组成,在不同辐射角度时,起落架噪声的声级在不同频率范围有一定的差异。襟翼侧缘噪声频谱是一个包含有个别明显单音噪声的宽频噪声谱,襟翼内侧缘噪声谱和外侧缘噪声谱有明显的差异,在低频范围,襟翼侧缘噪声的指向性比较明显,但在高频范围,襟翼侧缘噪声没有明显的指向性。 | 乔渭阳 Ulf Michel | 2008 | 航空学报2008，29，3： | 8 |
| 15 | Pain sensation in pancreatic diseases is not uniform: The different facets of pancreatic pain显示文摘AIM: To systematically characterize specific pain patterns in the most frequent pancreatic diseases.METHODS: Pain in patients with chronic pancreatitis(n = 314), pancreatic cancer(n = 469), and other pancreatic tumors(n = 249) including mucinous(n = 20) and serous cystadenoma(n = 31), invasive(n = 37) and non-invasive intraductal papillary mucinous neoplasia(IPMN; n = 48), low stage(n = 18) and high stage neuroendocrine neoplasia(n = 44), and ampullary cancer(n = 51) was registered and correlated with clinicopathological data. Survival times were estimated by the Kaplan-Meier method. Patients alive at the follow-up time were censored. Survival curves were compared statistically using the log-rank test.RESULTS: Forty-nine point one percent of pancreatic cancer patients revealed no pain, whereas in chronic pancreatitis only 18.3% were pain free. In contrary, moderate/severe pain was registered in 15.1% in pancreatic cancer patients that was increased in chronic pancreatitis with up to 34.2%. Serous cystadenoma was asymptomatic in most cases(58.1%), whereas 78.9% of all mucinous cystadenoma patients suffered pain. In neuroendocrine neoplasia pain was not a key clinical symptom since 64% of low stage neuroendocrine neoplasia and 59% of high stage neuroendocrine neoplasia patients were pain free. Cancer localization in the pancreatic body and patients with malignant pancreatic neoplasms were associated with more severe pain. Tumor grading and stage did not show any impact on pain. Only in pancreatic cancer, pain was directly associated with impaired survival.CONCLUSION: Pancreatic pain depicts different patterns of abdominal pain sensation according to the respective pancreatic disorder and does not allow a unification of the term pancreatic pain. | Jan G D'Haese Mark Hartel Ihsan Ekin Demir Ulf Hinz Frank Bergmann Markus W Büchler Helmut Friess Güralp O Ceyhan | 2014 | World Journal of Gastroenterology2014，20，27： | 8 |
| 16 | 通过贻贝养殖改善海水水质:瑞典社会的可盈利性方案显示文摘沿海水域的富营养化是一个在全球范围内需要付出巨大社会代价的严重的环境问题。在斯卡格拉克海峡东部,富营养化的降低计划通过氮输入量的减少逐步实现,但目前还不清楚如何去减少氮的输入量。其中一个可能的方法是养殖紫贻贝等滤食性生物,这种贻贝能够在生产海产品、饲料和农业肥料的同时也能够除去氮,从而将营养盐由海洋再循环到了陆地上。在瑞典西海岸的古尔马峡湾,我们对贻贝养殖可能对氮循环产生的影响进行了模拟。结果显示,该峡湾口地区氮的净输送量(溶解氮和颗粒状氮的总和)下降了20%。现有的商业贻贝养殖场已经免费提供了这种服务,但它对社会带来的利益将会远远大于这些。我们建议,不应该向贻贝饲养人支付劳动报酬,而应引入营养交换体制以提高沿海水域的状况。在这样的背景下提出了一个通过养殖贻贝来替代在吕瑟希尔社区的污水处理厂中消减氮含量的选择方案。生体毒素的聚积已被确定为瑞典的商业贻贝养殖进一步扩大方面的最大障碍,但这一问题似乎可以通过新技术和管理战略得以解决。在现有和可能的规定和支付费用的基础上,我们提出了一些可能会实现双赢的解决方案。 | Odd Lindahl Rob Hart Bodil Hernroth Sven Kollberg Lars-Ove Loo Lars Olrog Ann-Sofi Rehnstam-Holm Jonny Svensson Susanne Svensson Ulf Syversen 许天虎 | 2005 | AMBIO-人类环境杂志2005，34，2： | 7 |
| 17 | Grade of donor liver microvesicular steatosis does not affect the postoperative outcome after liver transplantation显示文摘BACKGROUND:The potential effect of graft steatosis on the postoperative liver function is discussed controversially. The present study aimed to evaluate the effect of the donor liver microvesicular steatosis on the postoperative outcome after liver transplantation.METHODS:Ninety-four patients undergoing liver transplantation at the University Hospital Aachen were included in this study. The patient cohort was divided into three groups according to the grade of microvesicular steatosis(MiS):MiS <30%(n=27), MiS 30%-60%(n=41) and MiS >60%(n=26).The outcomes after liver transplantation were evaluated, including the 30-day and 1-year patient and graft survival rates and the incidences of early allograft dysfunction(EAD) and primary nonfunction(PNF). RESULTS:The incidences of EAD and PNF did not differ significantly between the groups. We observed 5 cases of PNF,one occurred in the MiS <30% group and 4 in the MiS 30%-60% group. The 30-day and 1-year graft survivals did not differ significantly between groups. The 30-day patient survival rates were 100% in all groups. The 1-year patient survival rates were 94.4% in the MiS <30% group, 87.9% in the MiS 30%-60% group and 90.9% in the MiS >60% group.CONCLUSION:Microvesicular steatosis of donor livers has no negative effect on the postoperative outcome after liver transplantation. | Anne Andert Tom Florian Ulmer Wenzel Schoning Daniela Kroy Marc Hein Patrick Hamid Alizai Christoph Heidenhain Ulf Neumann Maximilian Schmeding | 2017 | Hepatobiliary & Pancreatic Diseases International2017，16，6： | 7 |
| 18 | 人为气溶胶排放导致最近80年东亚夏季风在过去四个世纪以来空前减弱显示文摘亚洲夏季风(Asian Summer Monsoon,ASM)对亚洲数十亿人口的生存、亚洲生态系统和生物多样性的分布、以及农业生产(粮食安全)和工业活动影响严重。因此了解ASM过去时空变化及其动力学过程对陆地生态系统、水资源、森林和景观研究至关重要。近几十年,器测记录显示以降水量为代表的ASM强度一直在减弱,但这一减弱趋势的起始时间和动力学过程尚不清楚。为此,第一次集成了ASM西部-中部边缘带10个对降水敏感的树木年轮宽度年表,重建了公元1566年以来反映ASM强度变化的降水序列。重建结果不仅捕捉到了ASM过去4个世纪以来强弱变化历史,也反映出历史上蝗灾与弱季风的关联。特别是发现了最近80年具有过去448年中前所未有的、最为强烈的、显著且持续时间最长的ASM强度减弱趋势。这一减弱趋势与在温室效应影响下ASM本该增强的预期大相庭径。耦合气候模型实验表明,北半球人为硫酸盐气溶胶排放的逐渐增加,对ASM减弱起了决定性作用。 | 刘禹 蔡文炬 孙长峰 宋慧明 Kim MCobb 李建平 Steven WLeavitt 吴立新 蔡秋芳 刘若时 Benjamin Ng Paolo Cherubini Ulf Büntgen 宋怡 王国建 雷莺 晏利斌 李强 马永永 方丛羲 孙军艳 李旭祥 Deliang Chen Hans WLinderholm | 2019 | 地球环境学报2019，10，6： | 7 |
| 19 | The Muruntau gold deposit(Uzbekistan)--A unique ancient hydrothermal system in the southern Tien Shan显示文摘The Muruntau gold deposit in the Central Kyzylkum,Uzbekistan is one of the largest single gold deposits worldwide.Data available from the literature are reviewed with the aim to(1) integrate the present knowledge on this unique deposit from Russian and English literature;(2) show the considerable progress made in the understanding of the genesis of the Muruntau deposit during the last decades;and(3) point to problems still open for future research.Deposit formation occurred through a multi-stage process involving sedimentation,regional metamorphism including thrusting,magmatism with formation of hornfels aureoles and several stages of hydrothermal activity.According to recent knowledge,synsedimentary or pure metamorphic formation of gold mineralization seems unlikely.The role of granite magmatism occurring roughly within the same time interval as the main hydrothermal gold precipitation remains uncertain.There are no signs of interaction of matter between the magma(s) and the hydrothermal system(s).On the other hand,there was an intense,high-temperature(above 400 ℃)fluid- wall rock interaction resulting in the formation of gold-bearing,cone-like stockworks with veins,veinlets and gold-bearing metasomatites.Several chemical and isotope indicators hint at an involvement of lower-crustal or mantle-related sources as well as of surface waters in ore formation.Deposit formation through brecciation involving explosion,hydrothermal or tectonic breccias might explain these data.Further investigations on breccia formation as well as on the exact timing of relevant sedimentary,metamorphic,magmatic and hydrothermal events are recommended. | Ulf Kempe Torsten Graupner Reimar Seltmann Hugo de Boorder Alla Dolgopolova Maarten Zeylmans van Emmichoven | 2016 | Geoscience Frontiers2016，7，3： | 7 |
| 20 | High-aspect 3D two-photon polymerization structuring with widened objective working range (WOW-2PP)显示文摘We developed a novel two-photon polymerization(2PP)configuration for fabrication of high-aspect three-dimensional(3D)structures,with an overall height larger than working distance of the microscope objective used for laser beam focusing into a photosensitive material.This method is based on a modified optical 2PP setup,where a microscope objective(1003 high N.A.),immersion oil and cover glass can be moved together into the photosensitive material,resulting in an effective higher and wider objective working range(WOW-2PP).The proposed technique enables the fabrication of high-aspect structures with sub-micrometer process resolution.3D structures with a height of 7 mm are demonstrated,which could hardly be built with the conventional 2PP set-up due to refractive index mismatch and laser beam disturbances. | Kotaro Obata Ayman El-Tamer Lothar Koch Ulf Hinze Boris N Chichkov | 2013 | Light(Science & Applications)2013，2，1： | 7 |
您所在的机构暂未开通此部分的功能，请联系管理员