检索结果-南通市图书馆

World Journal of Mechanics 2013年第3期3卷 178-183页

作者： S?ren Heide Lambertsen Lars Damkilde anders schmidt kristensen Ronnie Refstrup Pedersen Division of Structures and Materials Aalborg University EsbjergEsbjergDenmark

In this paper the fatigue behavior of laser welded T-joints of stainless steel AISI304 is investigated experimentally. In the fatigue experiments 36 specimens with a sheet thickness of 1 mm are exposed to one-dimensional cyclic loading. Three different types of specimens are adopted. Three groups of specimens are used, two of these are non-welded and the third is welded with a transverse welding (T-Joint). The 13 laser welded specimens are cut out with a milling cutter. The non-welded specimens are divided in 13 specimens cut out with a milling cutter and 10 specimens cut out by a plasma cutter. The non-welded specimens are used to study the influence of heat and surface effects on the fatigue life. The fatigue life from the experiments is compared to fatigue life calculated from the guidelines in the standards DNV-RP-C203 and EUROCODE 3 EN-1993-1-9. Insignificant differences in fatigue life of the welded and non-welded specimens are observed in the experiments and the largest difference is found in the High Cycle Fatigue (HCF) area. The specimens show a lower fatigue life compared to DNV-RP-C203 and EUROCODE 3 EN-1993-1-9 when the specimens are exposed to less than 4.0 1E06 cycles. Therefore, we conclude that the fatigue life assessment according to the mentioned standards is not satisfactory and reliable.

关键词： AISI304 Laser Welding Austenite Martensite

High frame rate multi-resonance imaging refractometry with distributed feedback dye laser sensor

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Light(Science & Applications) 2015年第1期4卷 410-414页

作者： Christoph Vannahme Martin Dufva anders kristensen Technical University of Denmark Department of Micro-and NanotechnologyDTU NanotechDK-2800 Kgs.LyngbyDenmark

High frame rate and highly sensitive imaging of refractive index changes on a surface is very promising for studying the dynamics of dissolution,mixing and biological processes without the need for ***,a highly sensitive distributed feedback(DFB)dye laser sensor for high frame rate imaging refractometry without moving parts is *** dye lasers are low-cost and highly sensitive refractive index *** unique multi-wavelength DFB laser structure presented here comprises several areas with different grating *** two dimensions of space is enabled by analyzinglaser light from all areasin parallelwith an imaging *** this multi-resonance imaging refractometry method,the spatial position in one direction is identified from the horizontal,i.e.,spectral position of the multiple laser lines which is obtained from the spectrometer charged coupled device(CCD)*** orthogonal spatial position is obtained from the vertical spatial position on the spectrometer CCD array as in established spatially resolved ***,the imaging technique is demonstrated by monitoring the motion of small sucrose molecules upon dissolution of solid sucrose in *** omission of moving parts improves the robustness of the imaging system and allows a very high frame rate of up to 12 Hz.

关键词： distributed feedback laser label-free imaging laser sensor refractive index sensor

Surgical apgar score predicts early complication in transfemoral amputees:Retrospective study of 170 major amputations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2016年第12期7卷 832-838页

作者： Christian Wied Nicolai B Foss Morten T kristensen Gitte Holm Thomas Kallemose anders Troelsen Department of Orthopedic Surgery Copenhagen University Hospital Hvidovre Department of Anesthesiology and Intensive Care Copenhagen University Hospital Hvidovre Physical Medicine and Rehabilitation Research-Copenhagen Department of Physical TherapyCopenhagen University Hospital Hvidovre Clinical Research Centre Copenhagen University Hospital Hvidovre

AIM To assess whether the surgical apgar score(SAS) is a prognostic tool capable of identifying patients at risk of major complications following lower extremity amputations *** This was a single-center,retrospective observational cohort study conducted between January 2013 and April 2015. All patients who had either a primary transtibial amputation(TTA) or transfemoral amputation(TFA) conducted at our institution during the study period were assessed for inclusion. All TTA patients underwent a standardized one-stage operative procedure(ad modum Persson amputation) performed approximately 10 cm below the knee joint. All TTA procedures were performedwith sagittal flaps. TFA procedures were performed in one stage with amputation approximately 10 cm above the knee joint,performed with anterior/posterior flaps. Trained residents or senior consultants performed the surgical procedures. The SAS is based on intraoperative heart rate,blood pressure and blood loss. Intraoperative parameters of interest were collected by revising electronic health records. The first author of this study calculated the SAS. Data regarding major complications were not revealed to the author until after the calculation of SAS. The SAS results were arranged into four groups(SAS 0-4,SAS 5-6,SAS 7-8 and SAS 9-10). The cohort was then divided into two groups representing low-risk(SAS ≥ 7) and highrisk patients(SAS < 7) using a previously established threshold. The outcome of interest was the occurrence of major complications and death within 30-d of *** A logistic regression model with SAS 9-10 as a reference showed a significant linear association between lower SAS and more postoperative complications [all patients: OR = 2.00(1.33-3.03),P = 0.001]. This effect was pronounced for TFA [OR = 2.61(1.52-4.47),P < 0.001]. A significant increase was observed for the high-risk group compared to the low-risk group for all patients [OR = 2.80(1.40-5.61),P = 0.004] and for the TFA sub-

关键词： Surgical apgar score Mortality Transfemoral amputation Post-operative complication Lower extremity amputation

Tourniquets do not increase the total blood loss or reamputation risk in transtibial amputations

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Orthopedics 2017年第1期8卷 62-67页

作者： Christian Wied Peter T Tengberg Gitte Holm Thomas Kallemose Nicolai B Foss anders Troelsen Morten T kristensen Depart-ment of Orthopedic Surgery Copenhagen University Hospital Hvidovre Clinical Research Centre Copenhagen University Hospital Hvidovre Department of Anesthesiology and Intensive Care Copenhagen University Hospital Hvidovre Physical Medicine and Rehabilita-tion Research--Copenhagen Department of Physical TherapyCopenhagen University Hospital Hvidovre

AIM To investigate the total blood loss(TBL) and the safety with respect to the re-amputation rate after transtibial amputation(TTA) conducted with and without a tourniquet. METHODS The study was a single-centre retrospective cohort study of patients with a primary TTA admitted between January 2013 and April 2015. All patients with a primary TTA were assessed for inclusion if the amputation was performed because of arteriosclerosis or diabetic complications. All patients underwent a standardized TTA procedure that was performed approximately 10 cm below the knee joint and performed with sagittalflaps. The pneumatic tourniquet, when used, was inflated around the femur to a pressure of 100 mmH g above the systolic blood pressure. The number of blood transfusions within the first four postoperative days was recorded. The intraoperative blood loss(OBL), which is defined as the volume of blood lost during surgery, was determined from the suction volume and by the weight difference of the surgical dressings. The trigger for a blood transfusion was set at a decrease in the Hgb level < 9.67 g/dL(6 mmol/L). Transfusions were performed with pooled red blood cells containing 245 m L per portion, which equals 55 g/L of haemoglobin. The TBL during the first four postoperative days was calculated based on the haemoglobin level and the estimated blood volume. The re-amputation rate was evaluated within 30 d. RESULTS Seventy-four out of 86 consecutive patients who underwent TTA within the two-year study period were included in the analysis. Of these, 38 were operated on using a tourniquet and 36 were operated on without using a tourniquet. There were no significant preoperative differences between the groups. The patients in both groups had a postoperative decrease in their Hgb level compared with preoperative baseline values. The patients operated on using a tourniquet received approximately three millilitres less blood transfusion per kilogram body weight compared with patients o

关键词： Total blood loss Intraoperative blood loss Transtibial amputation Lower extremity amputation Pneumatic tourniquet Re-amputation

Severe steroid refractory gastritis induced by Nivolumab: A case report

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2020年第16期26卷 1971-1978页

作者： Helene Hjorth Vindum JØrgen S Agnholt anders Winther Moelby Nielsen Mette Bak Nielsen Henrik schmidt Department of Oncology Aarhus University HospitalAarhus 8200Denmark Department of Gastroenterology Aarhus University HospitalAarhus 8200Denmark Department of Pathology Aarhus University HospitalAarhus 8200Denmark

BACKGROUND Immune checkpoint inhibitors are widely used for treatment of many advanced *** gastrointestinal(GI)side effects,such as diarrhea and colitis,are common,but upper GI side effects are rarely ***,the correct treatment of upper GI adverse events has been less frequently *** SUMMARY We describe a case of a 16-year-old woman with stage IIIb malignant melanoma treated with adjuvant monotherapy using *** patient developed severe gastritis after six series of Nivolumab with weight loss,nausea,and *** was no effect of intravenous steroids,but the patient′s condition resolved after administration of *** This case report supports the same treatment for gastritis as for colitis,which is in line with current guidelines.

关键词： Gastritis Immune checkpoint inhibitors Nivolumab Case report Immune-related adverse events Infliximab

Identification and characterization of the capsule biosynthetic locus of Gallibacterium anatis biovar haemolytica

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Identification and characterization of the capsule biosynthe...

丹麦Lynetten污水处理厂运行维护与管理

The 15th World Veterinary Poultry Congress

作者： anders M Bojesen Edgardo V Soriano Bodil M kristensen Department of Veterinary Pathobiology Faculty of Life SciencesUniversity of CopenhagenDK-1870 Frederiksberg CDenmark. Centro de Investigaci y Estudios Avanzados en Salud Animal Facultad de Medicina Veterinaria y ZootecniaUniversidad Aut oma del Estado de MexicoToluca50000Mexico Department of Veterinary Pathobiology Faculty of Life SciencesUniversity of CopenhagenDK-1870 Frederiksberg CDenmark.

＜正＞The aim of this study was to identify and characterize the genetic elements responsible for capsule biosyn- thesis in *** is a common inhabitant of the upper respiratory and lower genital tract of poultry but ha...

关键词：

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

给水排水 2007年第10期33卷 37-41页

作者：崔成武方成 Carsten Thirsing Kaare Press-kristensen Jens Ejbye schmidt 丹麦技术大学环境与资源学院 Lynettef■llesskabet公司

对丹麦第一大城市污水处理厂——Lynetten污水处理厂的运行、维护和日常管理进行了详细介绍。同时对该污水处理厂的能耗状况、污泥处理工艺以及污水和污泥处理费用进行了总结和分析。

关键词：污水处理污泥处理管理运行费用丹麦

Day to Day Consistency and Inter-subject Variability of Neuromuscular Responses and Performance Fatigability as the Result of Maximal,Bilateral,Dynamic Leg Extensions

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Science in Sport and Exercise 2021年第2期3卷 195-204页

作者： Joshua L.Keller Terry J.Housh John Paul V.anders Cory M.Smith Ethan C.Hill Richard J.schmidt Glen O.Johnson Exercise Physiology Laboratory University of Nebraska-Lincoln1740 Vine StreetLincolnNE 68508USA Department of Kinesiology Human and Environmental Physiology LaboratoryUniversity of Texas At El PasoEl PasoTX 79968USA School of Kinesiology and Physical Therapy Division of KinesiologyUniversity of Central FloridaOrlandoFL 32816USA

Purpose The purpose of the present study was to examine the day-to-day consistency and inter-subject variability of com-posite and individual,neuromuscular and torque patterns of responses as a result of a fatiguing bout of maximal,bilateral,isokinetic leg extension muscle *** Ten men (Mean ± SD =21.6 ± 2.5 years) completed two testing visits consisting of pretest and posttest maximal voluntary isometric contractions (MVIC) as well as 25 maximal,bilateral,isokinetic (180°/s),leg extension muscle *** (EMG) and mechanomyographic (MMG) signals were collected from the vastus lateralis and normalized to the *** fatigability was defined as the percent decline in torque between the average of repetitions 1,2,and 3 and repetitions 23,24,and *** regression was used to examine the individual and composite relation-ships between EMG amplitude (AMP),EMG mean power frequency (MPF),MMG AMP,MMG MPF,and torque versus *** There was no significant difference (d =0.80;P =0.17) in the performance fatigability between Day 1 (19.3% ± 7.1%)and Day 2 (26.9% ± 11.3%).Polynomial regression indicated substantial inter-subject variability,but high day-to-day *** The composite EMG AMP,MMG AMP,and MMG MPF patterns of responses demonstrated consistency across *** composite EMG MPF patterns of responses,however,were not consistent between Day 1 and Day *** addition,based on the high inter-subject variability,future studies should present both composite patterns of neuromuscular responses and the patterns of responses on a subject-by-subject basis to make inferences regarding fatigue-induced changes in motor unit activation strategies.

关键词： Performance fatigability Electromyography Mechanomyography Bilateral Dynamic

Coactivation Does Not Contribute to Fatigue-Induced Decreases in Isokinetic Forearm Flexion and Extension Torque

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Science in Sport and Exercise 2023年第4期5卷 314-321页

作者： Tyler J.Neltner John Paul V.anders Robert W.Smith Jocelyn E.Arnett Joshua L.Keller Terry J.Housh Richard J.schmidt Glen O.Johnson Department of Nutrition and Health Sciences University of Nebraska-LincolnLincolnNE 68510USA Integrative Laboratory of Exercise and Applied Physiology(iLEAP) Department of HealthKinesiology and SportUniversity of South AlabamaMobileAL 36688USA

Purpose The present study examined the effects of a reciprocal,slow velocity forearm flexion and extension task on fatigue-induced changes in isokinetic torque,agonist and antagonist muscle activation,and coactivation ratios at slow and moderate *** Nine women(mean±SD:age=21.0±1.7 years;body mass=68.1±8.2 kg;height=167.4±7.2 cm)completed pre-testing for forearm flexion and extension isokinetic peak torque at 60 and 180°/s,a fatiguing task of 50 maximal,recip-rocal,isokinetic muscle actions at 60°/s,and *** amplitude(AMP)of the electromyographic(EMG)signals from the biceps and triceps were simultaneously *** and EMG AMP were normalized to the corresponding values from the pre-testing peak torque *** measures ANOVAs and pairwise comparisons were used to identify mean changes in torque,EMG AMP,and coactivation *** The torque analyses indicated significant decreases from pre-to post-testing for forearm flexion(14.1%±5.0%;P0.05)from pre-to post-testing for either velocity or *** The torque responses were velocity-specific,with greater fatigability exhibited for forearm extension versus flexion at 60°/s,but no differences at 180°/*** parallel EMG AMP responses between the agonist and antagonist muscles for both velocities supported the lack of fatigue-induced changes in coactivation ***,our results demonstrated that fatigue-induced decreases in torque were not attributable to increases in antagonist activation or coactivation.

关键词： Coactivation Isokinetic Fatigue Forearm flexion Extension

北欧岩高兰(Empetrum)生态系统:功能及其对环境变化的敏感性

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

AMBIO－人类环境杂志 2000年第2期29卷 90-97页

作者： Knud Tybirk Marie-Charlotte Nilsson anders Michelsen Hanne Lakkenborg kristensen Anna shevtsova Morten Tune Strandberg Marianne Johansson Knud Erik Nielsen Torben Riis-Nielsen Beate Strandberg Ib Johansen 萨仁 NERI Dept.of Landscape Ecology Grenvej 14 DK-8410 Rnde Denraark Forest Vegetation Ecology SLU SE-90183 Ume Sweden Plant Ecology Φ.Farimagasgade 2DDK-1353 Copenhagen K Denmark of Forest Ecology Forest and Landscape Research Institute Hrsholm Kongevej 29 DK-2970 Hrshoim Denmark Biology University of Turku FIN-20014 Turku Finland Terrestrial Ecology NERI Vejlsvej 25 DK-8600 SilkeborgDenmark of Mycology Botanical Institute University of Copenhagen .Farimagasgade 2D DK-1353 Copenhagen K Denmark Forest Ecology Forest and Landscape Research Institute Hrsholm Kongevej 29 DK-2970 Hrsholm Denmark Plant Ecology University of Copenhagen .Farimagasgade 2D DK-1353 Copenhagen K Denmark

本文回顾了关于北欧地区岩高兰(Empetrum nigrum ***和***)生态系统的知识。因为岩高兰叶片及其枯枝落叶含有丰富的酚,分解缓慢,随着有机质表土层的形成,养分存储于有机养分库中,主要由具有石南状根的植物所吸收利用。黑果岩高兰(Empetr... 详细信息

本文回顾了关于北欧地区岩高兰(Empetrum nigrum ***和***)生态系统的知识。因为岩高兰叶片及其枯枝落叶含有丰富的酚,分解缓慢,随着有机质表土层的形成,养分存储于有机养分库中,主要由具有石南状根的植物所吸收利用。黑果岩高兰(Empetrum nigrum)亚种Hermaphroditum是强有力的养分竞争者,并且在演替后期能战胜多数植物。这是化学干扰(他感作用)和资源竞争所致。岩高兰作为一种有机体耐大气污染,在适林海岸石南丛生地,由于大气中大量氮的沉积其生长活力甚至有所增加,但是它对机械干扰及火烧非常敏感。然而,有迹象表明,空气中无机气氮的输入可对岩高兰占优势时所形成的封闭式营养循环产生干扰。

关键词：北欧岩高兰生态系统功能环境变化敏感性