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A new Early Cretaceous dinosaur track assemblage and the first definite non-avian theropod swim trackway from China

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Chinese Science Bulletin 2013年第19期58卷 2370-2378页

作者： XING LiDa LOCKLEY Martin G ZHANG JianPing MILNER Andrew R C klein Hendrik LI DaQing PERSONS IV W Scott EBI JieFang School of the Earth Sciences and Resources China University of Geosciences Department of Biological Sciences University of Alberta 11455 Saskatchewan DriveEdmontonAlberta T6G 2E9Canada Dinosaur Tracks Museum University of Colorado Denver St. George Dinosaur Discovery Site at Johnson Farm 2180 East Riverside DriveUtah 84790USA Saurierwelt Pal ontologisches Museum Alte Richt 7D-92318 NeumarktGermany Geological Museum of Gansu Zhaojue County Bureau of Culture MultimediaPress & Sport Tourism

The trackway of a swimming theropod (ichnogenus Characichnos) is reported from the Lower Cretaceous Feitianshan Formation of Sichuan, China. These swim tracks help confirm that non-avian theropods were capable of forging moderately deep bodies of water. The trackway occurs on the same surface as a typical walking trackway of a sauropod (ichnogenus Brontopodus). Both occurrences are the first reported from the Cretaceous of Sichuan, and the swim tracks are the first well-preserved example of a Characichnos trackway from China. Additionally, a theropod walking trackway and several ornithopod walking trackways (similar to the ichnogenus Caririchnium) occur in the same horizon. The ornithopod trackways show a parallel orientation, suggesting gregarious behavior of the trackmakers, which may have been iguanodontiforms and/or hadrosauriforms. The co-occurrence of theropod swim tracks and theropod walking tracks suggests a fluctuation of water depth within a distinct time span.

关键词：蜥脚类恐龙早白垩世兽脚类游泳中国轨道鸟类组合和

Management of refractory ascites in cirrhosis:Are we out of date?

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World Journal of Hepatology 2016年第28期8卷 1182-1193页

作者： Alagappan Annamalai Lauren Wisdom Megan Herada Mazen Nourredin Walid Ayoub Vinay Sundaram Andrew klein Nicholas Nissen Comprehensive Transplant Center Cedars Sinai Medical Center

Cirrhosis is a major cause of morbidity and mortality worldwide with liver transplantations as it only possible *** the face of a significant organ shortage many patients die waiting.A major complication of cirrhosis is the development of portal hypertension and *** management of ascites has barely evolved over the last hundred years and includes only a few milestones in our treatment approach,but has overall significantly improved patient morbidity and *** mainstay to ascites management includes changes in diet,diuretics,shunt procedures,and large volume *** understanding of the pathophysiology of cirrhosis and portal hypertension has significantly improved in the last couple of decades but the changes in ascites management have not seemed to mirror this newer *** herein review the history of ascites management and discuss some its current limitations.

关键词： Portal hypertension Cirrhosis Ascites Transhepatic portosystemic shunts Paracentesis

壳层模型Sp（2Λ）代数的近似解析的玻色子实现

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中国科学（A辑） 1992年第3期23卷 283-292页

作者： klein,A 张庆营

本文将以解决Sp(4)一般表示封闭的解析的玻色子实现问题的方法,推广到求解一般情况的Sp(2Λ)(Λ为任意整数)的玻色子的实现问题.由于Sp(2Λ)(Λ>2)的生成元多出新的高阶项,其项数无限,从而使问题的复杂性比Sp(4)的情况大为增加,难以找... 详细信息

本文将以解决Sp(4)一般表示封闭的解析的玻色子实现问题的方法,推广到求解一般情况的Sp(2Λ)(Λ为任意整数)的玻色子的实现问题.由于Sp(2Λ)(Λ>2)的生成元多出新的高阶项,其项数无限,从而使问题的复杂性比Sp(4)的情况大为增加,难以找到精确解.但是,当忽略这些高阶项时,可以得到这种近似情况下的解析结果.

关键词：玻色子映射代数壳层模型

Juxta-caval hepatic angiomyolipoma masquerading as hepatocellular carcinoma

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Hepatobiliary & Pancreatic Diseases International 2003年第4期2卷 617-621页

作者： Alan M Hawxby Michael Torbenson Elliot Fishman Leo Lawler Luis M Arrazola Andrew S klein the Departments of Surgery The Johns Hopkins Hospital Baltimore MD 21287 USA Pathology The Johns Hopkins Hospital Baltimore MD 21287 USA Radiology The Johns Hopkins Hospital Baltimore MD 21287 USA the Departments of Surgery The Johns Hopkins Hospital Baltimore MD 21287 USA

Hepatic angiomyolipoma is an uncommon primary benign epithelial liver neoplasm. Most patients with angiomyolipomas are middle-aged women who commonly present with epigastric fullness or pain. Angiomyolipomas are tumors consisting of three tissue types: blood vessels, smooth muscle, and fat. Hepatic angiomyolipomas may be difficult to differentiate from other liver neoplasms by noninvasive imaging. We report a 58-year-old asymptomatic woman with a mass in the right lobe of the liver, found incidentally on routine abdominal sonography. Preoperative radiographic evaluation revealed a 6.5-cm hypervascular lesion abutting the inferior vena cava. Preoperative histologic study demonstrated an epithelial neoplasm suspicious for hepatocellular carcinoma. Metastatic workup was negative. At resection, the tumor was found to be an angiomyolipoma composed of lipoid, vascular and smooth muscle cells. Further staining was positive for HMB-45. Resection margins were negative. The woman had an uneventful recovery and was discharged on postoperative day seven. She currently remains well several months after her right hepatectomy.

关键词： angiomyolipoma hepatectomy radiographic evaluation multiplanar imaging

Effect of temperature and atmosphere on the tribological behavior of a polyether ether ketone composite

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Friction 2015年第4期3卷 259-265页

作者： Felipe Darabas RZATKI Diego Vinicius Dalevedo BARBOZA Renan Muller SCHROEDER Guilherme Mariz de Oliveira BARRA Cristiano BINDER Aloisio Nelmo klein JoséDaniel Biasoli DE MELLO Federal University of Santa Catarina-UFSC Mechanical Engineering DepartmentMaterials LaboratoryFlorianópolisSCBrazil Whirlpool/Embraco JoinvilleSCBrazil

Polyether ether ketone(PEEK)is a high-performance thermoplastic,which is often selected for high-temperature tribological applications under chemically aggressive *** present work investigates the tribological behavior of a high-performance PEEK composite under conditions that are often found inside hermetic ***,an AMTI tribometer equipped with a hermetic chamber and a heating system was used to conduct sliding tests of PEEK cylinders on AISI 304 stainless steel polished discs(S_(q)<10 nm)with reciprocating movement and a normal force of 175 *** tribological behavior of the PEEK/AISI 304 stainless steel system was investigated as a function of ambient temperature(30℃ and 80℃)and atmosphere(atmospheric air and tetrafluoroethane).Wear and surface roughness analyses were performed with white light interferometry and optical *** spectroscopy was used to investigate transfer films on the counter body *** was observed to have a strong influence on the tribological behavior of the samples tested under atmospheric air,with a 25%decrease in the friction coefficient associated with a 100%increase in the wear ***,the friction measured from the samples tested under a tetrafluoroethane atmosphere showed no significant temperature dependence.

关键词： solid lubricant thermoplastics environment temperature

Osteocyte morphology and orientation in relation to strain in the jaw bone

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International Journal of Oral Science 2018年第1期10卷 36-43页

作者： Vivian Wu René F. M. van Oers Engelbert A. J. M. Schulten Marco No Helder Rommel G. Bacabac Jenneke klein-Nulend Department of Oral Cell Biology Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands Department of Dental Materials Science Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences University of Amsterdam and Vrije Universiteit Amsterdam Amsterdam The Netherlands Department of Oral and Maxillofacial Surgery VU University Medical Center/Academic Centre for Dentistry Amsterdam (ACTA) Amsterdam Movement Sciences Amsterdam The Netherlands Department of Physics Medical Biophysics Group University of San Carlos Cebu City Philippines

Bone mass is important for dental implant success and is regulated by mechanoresponsive osteocytes. We aimed to investigate the relationship between the levels and orientation of tensile strain and morphology and orientation of osteocytes at different dental implant positions in the maxillary bone. Bone biopsies were retrieved from eight patients who underwent maxillary sinus-floor elevation with β-tricalcium phosphate prior to implant placement. Gap versus free-ending locations were compared using 1) a three-dimensional finite-element model of the maxilla to predict the tensile strain magnitude and direction and 2) histology and histomorphometric analyses. The finite-element model predicted larger, differently directed tensile strains in the gap versus freeending locations. The mean percentage of mineralised residual native-tissue volume, osteocyte number(mean ± standard deviations:97 ± 40/region-of-interest), and osteocyte shape(90% elongated,10% round) were similar for both locations. However, the osteocyte surface area was 1.5-times larger in the gap than in the free-ending locations, and the elongated osteocytes in these locations were more cranially caudally oriented. In conclusion, significant differences in the osteocyte surface area and orientation seem to exist locally in the maxillary bone, which may be related to the tensile strain magnitude and orientation. This might reflect local differences in the osteocyte mechanosensitivity and bone quality, suggesting differences in dental implant success based on the location in the maxilla.

关键词： SINUS FLOOR ELEVATION MINERAL DENSITY MAXILLARY HISTOMORPHOMETRY TOMOGRAPHY IMPLANTS SPINE

Sexuality of Repartnered Men and Women in France: Sexual Behaviors, Perceptions, Expectations and Sexual Dysfunctions

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Advances in Sexual Medicine 2012年第1期2卷 10-19页

作者： Marie-Helene Colson Antoine Lemaire Patrick klein 不详

Introduction. Although many epidemiological studies on sexuality have been published, none have specifically addressed male and female sexuality in repartnered couples. Aim. To investigate men and women’s sexual behaviors, perceptions and expectations, and the frequency of their sexual dysfunctions, with a focus on repartnered couples, i.e, subjects living with a partner in a stable relationship after divorce or widowhood (including both remarried couples and cohabitating unmarried couples). Methods. Analysis of telephone survey data collected from 1,002 French subjects (483 men, 519 women) ≥35years. Of these, 748 were living with their partner as part of a heterosexual couple. For these subjects, the sexuality of 149 repartnered subjects was compared to that of the other 599 subjects. Main Outcome Measures. A 39-item questionnaire assessing subjects' perceptions, expectations, sexual behaviors and dysfunctions. Results. Compared with other subjects, men and women in repartnered couples had more active sexuality and more interest in sexuality (men 93% vs 80%, P < 0.01, women 73% vs 65%, P < 0.05). They were generally more sensitive to feelings and emotions linked to their sexuality, and these feelings seemed to increase steadily with age. Their sexuality was more attuned to their partner’s pleasure (men 79% vs. 59% P < 0.001, women 50% vs. 34% P < 0.01). Concern for the future of the relationship and for sexuality was equally present for both groups, although repartnered couples were more often concerned about potential inadequacy and conflicts between the two partners. Although repartnered men seemed to be less affected by diminished desire, they had slightly higher rates of premature ejaculation and erectile dysfunction, and considered their quality of life to be more affected by these problems. Conclusion. The sexuality of repartnered couples remains poorly studied, but seems to differ from that of non-repartnered couples. Our findings open interesting avenues of

关键词： Repartnered Couples Remarried Couples Sexual Behavior Sexual Inadequency Marital Relationship

The new ichnotaxon Eubrontes nobitai ichnosp. nov. and other saurischian tracks from the Lower Cretaceous of Sichuan Province and a review of Chinese Eubrontes-type tracks

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Journal of Palaeogeography 2021年第3期10卷 302-320页

作者： Li-Da Xing Martin G.Lockley Hendrik klein Li-Jun Zhang Anthony Romilio W.Scott Persons IV Guang-Zhao Peng Yong Ye Miao-Yan Wang State Key Laboratory of Biogeology and Environmental Geology China University of GeosciencesBeijing 100083China School of the Earth Sciences and Resources China University of GeosciencesBeijing 100083China Dinosaur Trackers Research Group University of ColoradoDenver 80217USA Saurierwelt Paläontologisches Museum Alte Richt 7 D-92318 NeumarktGermany Institute of Resources and Environment Key Laboratory of Biogenic Traces and Sedimentary Minerals of Henan ProvinceCollaborative Innovation Center of Coalbed Methane and Shale Gas for Central Plains Economic RegionHenan Polytechnic UniversityJiaozuo 454003Henan ProvinceChina School of Biological Sciences The University of QueenslandBrisbaneQueensland 4072Australia Mace Brown Museum of Natural History Department of Geology and Environmental GeosciencesCollege of CharlestonCharleston 29401USA Zigong Dinosaur Museum Zigong 643013Sichuan ProvinceChina

The Jiaguan Formation and the underlying Feitianshan Formation(Lower Cretaceous) in Sichuan Province yield multiple saurischian(theropod–sauropod) dominated ichnofaunas. To date, a moderate diversity of six theropod ichnogenera has been reported, but none of these have been identified at the ichnospecies level. Thus, many morphotypes have common "generic" labels such as Grallator, Eubrontes, cf. Eubrontes or even "EubrontesMegalosauripus" morphotype. These morphotypes are generally more typical of the Jurassic, whereas other more distinctive theropod tracks(Minisauripus and Velociraptorichnus) are restricted to the Cretaceous. The new ichnospecies Eubrontes nobitai ichnosp nov. is distinguished from Jurassic morphotypes based on a very wellpreserved trackway and represents the first-named Eubrontes ichnospecies from the Cretaceous of Asia.

关键词： Ichnofossils Dinosaur footprints Theropod Myths

Test System for Disaggregation Algorithms for use in Smart Meters

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Test System for Disaggregation Algorithms for use in Smart M...