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Hip prosthetic loosening and periprosthetic osteolysis:A commentary

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World Journal of Orthopedics 2022年第6期13卷 574-577页

作者： bengt mjöberg Department of Orthopedics Lund UniversityLund SE-22100Sweden

Prosthetic loosening and periprosthetic osteolysis have been debated for decades,both in terms of the timing and nature of the triggering *** hypothesis of wear-particle-induced loosening states that wear particles cause a foreign-body response leading to periprosthetic osteolysis and ultimately to late prosthetic loosening,i.e.,that the osteolysis precedes the *** theory of early loosening,on the other hand,postulates that the loosening is already initiated during or shortly after surgery,i.e.,that the osteolysis is secondary to the *** commentary focuses on the causal relationship between prosthetic loosening and periprosthetic osteolysis.

关键词： Hip prosthesis Radiostereometric analysis Prosthesis failure Osteoclasts Bone resorption Alarmins

Neo-adjuvant radiotherapy in rectal cancer

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World Journal of Gastroenterology 2013年第46期19卷 8489-8501页

作者： bengt Glimelius Department of Radiology Oncology and Radiation Science Uppsala University

In rectal cancer treatment,attention has focused on the local primary tumour and the regional tumour cell deposits to diminish the risk of a loco-regional *** large randomized trials have also shown that combinations of surgery,radiotherapy and chemotherapy have markedly reduced the risk of a locoregional recurrence,but this has not yet had any major influence on overall *** best results have been achieved when the radiotherapy has been given *** radiotherapy improves loco-regional control even when surgery has been optimized to improve lateral clearance,i.e.,when a total mesorectal excision has been *** relative reduction is then 50%-70%.The value of radiotherapy has not been tested in combination with more extensive surgery including lateral lymph node clearance,as practised in some Asian *** details about how the radiotherapy is performed are still open for discussion,and practice varies between countries.A highly fractionated radiation schedule(5 Gy×5),proven efficacious in many trials,has gained much popularity in some countries,whereas a conventionally fractionated regimen(1.8-2.0 Gy×25-28),often combined with chemotherapy,is used in other *** additional therapy adds morbidity to the morbidity that surgery causes,and should therefore be administered only when the risk of loco-regional recurrence is sufficiently *** best integration of the weakest modality,to date the drugs(conventional cytotoxics and biologicals)is not known.A new generation of trials exploring the best sequence of treatments is ***,there is a great need to develop predictors of response,so that treatment can be further individualized and not solely based upon clinical factors and anatomic imaging.

关键词： Chemotherapy Chemoradiotherapy Local control Multidisciplinary Organ preservation Radio-therapy Randomized trials Rectal cancer

Investigation of Interacting Mechanism between Film Cooling and Internal Cooling Structures of Turbine Blade

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Journal of Thermal Science 2023年第1期32卷 330-350页

作者： ZHANG Guohua XIE Gongnan bengt Sundén School of Marine Science and Technology Northwestern Polytechnical UniversityXi'an 710072China School of Mechanical Engineering Northwestern Polytechnical UniversityXi'an 710072China Department of Energy Sciences Lund UniversityLund SE-22100Sweden Research&Development Institute of Northwestern Polytechnical University in Shenzhen Shenzhen 518057China

This paper presents three-dimensional numerical simulations with the established realizable k-εmodel to clarify the underlying and interacting mechanisms between the film cooling and the internal *** the one hand,the effects of three different internal cooling channels,i.e.,smooth channel,continuous ribbed channel,and truncated ribbed channel,on the film cooling effectiveness and the discharge coefficients are *** the other hand,the influences of three different film cooling holes,i.e.,cylindrical hole,two elliptical holes and two circular-to-elliptical holes,on the heat transfer performances and pressure loss of the internal cooling channel are ***,the suction effects of the film cooling holes are analyzed through setting up baselines with only internal cooling *** show that the placement of ribs in the internal channel has different influences on the film cooling effectiveness with respect to different hole shapes depending on the blowing *** discharge coefficient of the film hole can be improved by introducing ribs to the internal *** of film hole is helpful for enhancing the heat transfer performance and reducing the pressure loss of the internal ***,ribs instead of the suction effect of film hole play a major role to enhance the heat transfer performance in the internal cooling channel.

关键词： interacting mechanism film cooling effectiveness discharge coefficient heat transfer performance pressure drop

MAGNETIC FIELD EFFECT ON PHOTOPOLYMERIZATION OF STYRENE MICROEMULSION

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Chinese Journal of Polymer Science 1993年第1期11卷 1-7页

作者：陈用烈 Anders Hult bengt Ranby Institute of Polymer Science Zhongshan University Guangzhou Department of Polymer Technology The Royal Institute of Technology Stockholm Sweden

External magnetic field increases the photo-induced polymerization rate of styrene *** type of photoinitiator plays an important role. The photoinitiators, used are dimethoxyphenyl acetophenone(DMPA), 1-hydroxycyclohexyl phenylketone (Irgacure 184) and dimethylhydroxyacetophenone (Darocur 1173). No magnetic effect was observed by using dibenzylketone (DBK) as photoinitiator. The molecular weight of the polymer is slightly affected by magnetic field. The influence of temperature has also been investigated.

关键词： DMPA MAGNETIC FIELD EFFECT ON PHOTOPOLYMERIZATION OF STYRENE MICROEMULSION

Effects of Ribbed-Cavity Tip on the Blade Tip Aerothermal Performance in a High Pressure Turbine Stage

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Journal of Thermal Science 2023年第2期32卷 800-811页

作者： DU Kun LI Huarong SUNDEN bengt LIU Cunliang School of Power and Energy Northwestern Polytechnical UniversityXi'an 710072China Yangtze River Delta Research Institute of NPU Northwestern Polytechnical UniversityTaicang 215400China Shaanxi Key Laboratory of Thermal Sciences in Aero-Engine System Northwestern Polytechnical UniversityXi'an 710129China NPU-KAI International Joint Laboratory of Advanced Aero-Engine Thermal Structure Northwestern Polytechnical UniversityXi'an 710129China Division of Heat Transfer Department of Energy SciencesLund UniversityLund SE-22100Sweden

For unshrouded blade tip,the high-temperature gas flows through the tip clearance by force of the lateral pressure ***,the blade tip endures increasing thermal ***,the conventional blade tip treatment cannot continuously provide protection for the deteriorating service *** the present study,aerothermal characteristics of the squealer blade tip with staggered ribs,partial squealer rim and different partial squealer rim thickness were investigated to explore the influences of ribbed-cavity tip on the tip heat transfer,leakage flow and turbine stage *** numerical results indicate that the ribbed-cavity tips are beneficial for the reduction of the blade tip thermal load and leakage *** the present six blade tip designs,the minimal area-averaged heat transfer coefficient is obtained by the case with the staggered ribs and a deeper squealer rim,which is reduced by 31.41%relative to the squealer ***,the blade tip modification closer to leading edge or tip mid-chord region performs better than trailing edge in reducing the tip leakage flow.

关键词： gas turbine tip leakage flow numerical simulation blade tip configuration

Comparisons of Heat Transfer Enhancement of an Internal Blade Tip with Metal or Insulating Pins

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Advances in Applied Mathematics and Mechanics 2011年第3期3卷 297-309页

作者： Gongnan Xie bengt Sunden The Key Laboratory of Contemporary Design and Integrated Manufacturing Technology Northwestern Polytechnical UniversityXi’an 710072ShaanxiChina Division of Heat Transfer Lund UniversitySE-22100LundSweden

Cooling methods are needed for turbine blade tips to ensure a long durability and safe operation.A common way to cool a tip is to use serpentine passages with 180-deg turn under the blade tip-cap taking advantage of the threedimensional turning effect and impingement like *** internal convective cooling is therefore required to increase the blade tip *** the present study,augmented heat transfer of an internal blade tip with pin-fin arrays has been investigated numerically using a conjugate heat transfer *** computational domain includes the fluid region and the solid pins as well as the tip *** convective heat transfer between the fluid and pins,and heat conduction within pins and tip are simultaneously *** main objective of the present study is to observe the effect of the pin material on heat transfer enhancement of the pin-finned *** is found that due to the combination of turning,impingement and pin-fin crossflow,the heat transfer coefficient of a pin-finned tip is a factor of 2.9 higher than that of a smooth tip at the cost of an increased pressure drop by less than 10%.The usage of metal pins can reduce the tip temperature effectively and thereby remove the heat load from the ***,it is found that the tip heat transfer is enhanced even by using insulating pins having low thermal conductivity at low Reynolds *** comparisons of overall performances are also included.

关键词： Heat transfer enhancement tip-wall pins thermal conductivity weight

Gut microbiota and surgical disease

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Hepatobiliary Surgery and Nutrition 2018年第1期7卷 32-33页

作者： bengt Jeppsson Department of Surgery Lund UniversityLundSweden

Why should surgeons study gut microbiota and microbiome(totality of body's microorganisms and genomes)?There are at least three reasons.

关键词： surgical reasons surgeon

WAVELET ANALYSIS IN THE TIME-FREQUENCY SPECTRUM FOR SOME NONLINEAR WAVES OBSERVED BY FREJA SATELLITE

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紫金山天文台台刊 1998年第2期 101-108页

作者： bengt Holback Swedish Institute for Space Physics Uppsala Sweden

Some new nonlinear plasma waves at the local ion gyrofrequencies or low-hybrid frequency observed by Freja satellite in low aurora( 1700km) are reported and analyzed with the wavelet transformation in the time-frequency spectrum, especially, the multi-frequency structures and their time evolution. Hence, the wavelet transformation may be a powerful method to study the time-frequency fine structures.

关键词：天文台紫金山卫星观测光力频率谱非线性波小波分析作时气田二氨

A CALCULUS FOR SERVICES INNOVATION

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Journal of Systems Science and Systems Engineering 2007年第2期16卷 129-165页

作者： James M. TIEN Daniel berg Department of Decision Sciences and Engineering Systems Rensselaer Polytechnic Institute Troy New York USA

Innovation in the services area - especially in the electronic services （e-services） domain - can be systematically developed by first considering the strategic drivers and foci, then the tactical principles and enablers, and finally the operational decision attributes, all of which constitute a process or calculus of services innovation. More specifically, there are four customer drivers （i.e., collaboration, customization, integration and adaptation）, three business foci （i.e., creation-focused, solution-focused and competition-focused）, six business principles （i.e., reconstruct market boundaries, focus on the big picture not numbers, reach beyond existing demand, get strategic sequence right, overcome organizational hurdles and build execution into strategy）, eight technical enablers （i.e., software algorithms, automation, telecommunication, collaboration, standardization, customization, organization, and globalization）, and six attributes of decision informatics （i.e., decision-driven, information-based, real-time, continuously-adaptive, customer-centric and computationally-intensive）. It should be noted that the four customer drivers are all directed at empowering the individual - that is, at recognizing that the individual can, respectively, contribute in a collaborative situation, receive customized or personalized attention, access an integrated system or process, and obtain adaptive real-time or just-in-time input. The developed process or calculus serves to identify the potential white spaces or blue oceans for innovation. In addition to expanding on current innovations in services and related experiences, white spaces are identified for possible future innovations; they include those that can mitigate the unforeseen consequences or abuses of earlier innovations, safeguard our rights to privacy, protect us from the always-on, interconnected world, provide us with an authoritative search engine, and generate a GDP metric that can adequately measure the gro

关键词： Services innovation decision informatics software algorithms automation globalization collaboration customization integration adaptation standardization telecommunication organization business principles