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Calcar-guided short-stem total hip arthroplasty: Will it be the future standard? Review and perspectives

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World Journal of Orthopedics 2021年第8期12卷 534-547页

作者： Karl philipp Kutzner Department of Orthopaedic Surgery St Josefs Hospital WiesbadenGermanyWiesbaden 65189Germany Department of Hip Surgery Gelenkzentrum Rhein-MainWiesbaden 65183Germany Center of Orthopedics and Traumatology Johannes Gutenberg-University of MainzMainz 55131Germany

Short stems in total hip arthroplasty(THA)are becoming increasingly *** Germany,already 10.4%of all primary THAs are performed using a cementless short *** concept of modern,calcar-guided,short stems aims for an individualized reconstruction of the hip anatomy by following the calcar of the femoral neck,a bone-and soft-tissue-sparing implantation technique,and physiological *** stem design uses either metaphyseal fixation alone or additional diaphyseal anchoring,depending on the stem alignment and *** individualized anchorage types increase the potential indications for the safe use of a short *** design features may account for potential advantages of current short stem implants compared with earlier shortstem designs,particularly in cases of reduced bone quality or osteonecrosis of the femoral head and femoral neck *** implantation technique,however,requires distinct knowledge regarding the characteristics of varus and valgus positioning,with the potential for clinical consequences.A learning curve for surgeons new to this technique must be taken into *** contact with the distal lateral cortex appears to be crucial to provide sufficient primary stability,and the use of intraoperative imaging to identify“undersizing”is highly *** results of several national registries indicate that calcarguided short stems are among the most successful implants in terms of mid-term ***,long-term data remain *** review introduces the characteristics of calcar-guided short-stem THA and summarizes the current evidence.

关键词： Total hip arthroplasty Short stem Calcar-guided Classification Indications Anchorage Optimys

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接触器通断时的动作时间

低压电器 1989年第3期 56-58,61页

作者： hans philipp 李中琴

一、概述VDE规范中接触器的定义为:在正常电路条件下:(包括操作过负载情况)可以接通、承载和分断电流的非手动开关电器,这种电器仅具有一个休止位置。接触器一般用于频繁操作。采用电磁传动的接触器(见图1)定义为:由电磁铁产生力使其主... 详细信息

一、概述VDE规范中接触器的定义为:在正常电路条件下:(包括操作过负载情况)可以接通、承载和分断电流的非手动开关电器,这种电器仅具有一个休止位置。接触器一般用于频繁操作。采用电磁传动的接触器(见图1)定义为:由电磁铁产生力使其主触头闭合或断开的一种接触器。

关键词：接触器动作时间

100 GHz silicon–organic hybrid modulator

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Light(Science & Applications) 2014年第1期3卷 196-199页

作者： Luca Alloatti Robert Palmer Sebastian Diebold Kai philipp Pahl Baoquan Chen Raluca Dinu Maryse Fournier Jean-Marc Fedeli Thomas Zwick Wolfgang Freude christian Koos Juerg Leuthold Institutes IPQ and IMT Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany Institute IHE Karlsruhe Institute of Technology(KIT)76131 KarlsruheGermany GigOptix Inc. BothellWAUSA CEA Leti38054 GrenobleFrance Institute of Photonic Systems Swiss Federal Institute of

Electro-optic modulation at frequencies of 100 GHz and beyond is important for photonic-electronic signal processing at the highest *** date,however,only a small number of devices exist that can operate up to this *** this study,we demonstrate that this frequency range can be addressed by nanophotonic,silicon-based *** exploit the ultrafast Pockels effect by using the silicon–organic hybrid(SOH)platform,which combines highly nonlinear organic molecules with silicon *** now,the bandwidth of these devices was limited by the losses of the radiofrequency(RF)signal and the RC(resistor-capacitor)time constant of the silicon *** RF losses are overcome by using a device as short as 500 μm,and the RC time constant is decreased by using a highly conductive electron accumulation layer and an improved gate *** this method,we demonstrate for the first time an integrated silicon modulator with a 3dB bandwidth at an operating frequency beyond 100 *** results clearly indicate that the RC time constant is not a fundamental speed limitation of SOH devices at these *** device has a voltage–length product of only V_(π)L=11 V mm,which compares favorably with the best silicon-photonic modulators available *** cladding materials with stronger nonlinearities,the voltage–length product is expected to improve by more than an order of magnitude.

关键词： 100GHz high-speed silicon modulator nanophotonics silicon–organic hybrid

Experimental study and modeling of particle drying in a continuously-operated horizontal fluidized bed

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Particuology 2017年第5期15卷 134-146页

作者： Kaicheng Chen philipp Bachmann Andreas Buck Michael Jacob Evangelos Tsotsas Thermal Process Engineering Otto-von-Guericke-University Universityatsplatz 239106 MagdeburgGermany Glatt Ingenieurtechnik GmbH Nordstrasse 12 99427 Weimar Germany

Multistage fluidized beds are frequently used for product drying in industry. One advantage of these fluidized beds is that they can achieve a high throughput, when operated continuously. In this study, γ- A1203 particles were dried in a pilot-scale horizontal fluidized bed, without considering any comminution effects. For each experiment, the particle moisture content distribution and residence time distribution were determined. To take into account particle back mixing in our experiments, a one-dimensional pop- ulation balance model that considers particle residence time was introduced into a fluidized bed-drying model. Experimental particle residence time distributions were reproduced using a tank-in-series model. Subsequently, the moisture content distribution was implemented, as a second dimension to the popu- lation balance in this model. These two-dimensional simulations were able to describe the experimental data, especially the spread in the residual particle moisture distribution, much more accurately than one-dimensional simulations. Using this novel two-dimensional model, the effects of different operating parameters （process gas temperature, solid feed rate, superficial air velocity） on the particle moisture content distribution were systematically studied.

关键词： Continuous dryingHorizontal fluidized bed Residence time distribution Moisture content distributionPopulation balance

Reaction zone characterization of counter-flow diffusion flame with diluted and preheated reactants

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International Journal of Minerals,Metallurgy and Materials 2009年第3期16卷 278-284页

作者： Yu-ying Liu Jean-michel Most philipp Bauer Alain Claverie School of Jet Propulsion Beijing University of Aeronautics ＆ Astronautics Beijing 100083 China Laboratoire de Combustion et de Détonique （UPR 9028 au CNRS） F-86961 Futuroscope Cedex Poitiers France

Reaction zone characteristics were studied using hydroxy radical planar laser-induced fluorescence （OH-PLIF） technique for a counter-flow preheated （CH4＋N2）/（Air＋N2） diluted diffusion flames. The effects of preheat temperature and dilute ratio on the reaction zone characteristics were investigated by demonstrating the OH intensity distribution and reaction zone thickness from OH-PLIF images. Under the experimental conditions of constant cold flow velocity, the results show that the OH intensity and reaction zone thickness decrease with the increase of dilute ratio at constant preheat temperature and increase with preheat temperature at fixed dilute ratio. The OH maximum intensity shifts towards the ＂lean＂ side of counter flow at constant preheat temperature, and it shifts towards the fuel side with the increase of dilute ratio of fuel stream and towards the oxidizer side with the increase of dilute ratio of oxidizer stream respectively. The feasibility of OH as a reaction zone marker in this diluted combustion is verified further. The variation of diffusion and chemical reaction rate of reactants due to preheat and dilution contributes to the reaction zone characteristics simultaneously. The effect of strain on the flame reaction zone should be included in the future work.

关键词： counter-flow preheat diluted combustion reaction zone OH-PLIF

Executive function impairments in high IQ children and adolescents with ADHD

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Open Journal of Psychiatry 2011年第2期1卷 56-65页

作者： Thomas Edwards Brown philipp christian Reichel Donald Michael Quinlan 不详

Objective: To demonstrate that high IQ children and adolescents diagnosed with ADHD tend to suffer from executive function (EF) impairments that: a) can be identified with a combination of standardized measures and normed self-report data;and b) occur more frequently in this group than in the general population. Method: From charts of 117 children and adolescents aged 6 to 17 years with high IQ ( ≥ 120) who fully met DSM-IV diagnostic criteria for ADHD, data on 8 normed measures of executive function (EF) were extracted: IQ index scores for working memory and processing speed, a standardized measure of auditory verbal memory, and 5 clusters of the Brown ADD Scale, a normed, age-graded rating scale for ADHD-related executive function impairments in daily life. Significant impairment was computed for each individual relative to age-appropriate norms for each measure and comparisons were made to base-line rates in the general population. Results: Sixty-two percent of participants were significantly impaired on at least 5 of these 8 markers of EF. Chi-square comparisons of scores from these high IQ participants were significantly different (p < 0.001) from standardization norms for each of the eight EF measures. Conclusions: High IQ children and adolescents with ADHD, despite their cognitive strengths, tend to suffer from significant impairments of executive functions that can be assessed with these measures;incidence of these impairments is significantly greater than in the general population. These results are fully consistent with data on high IQ adults diagnosed with ADHD.

关键词： ADHD Executive Functions High IQ Working Memory Processing Speed

Extended time improves reading comprehension test scores for adolescents with ADHD

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Open Journal of Psychiatry 2011年第3期1卷 79-87页

作者： Thomas Edwards Brown philipp christian Reichel Donald Michael Quinlan 不详

Objective: To test the hypotheses that reading comprehension difficulties of adolescent students with ADHD: 1) are related not so much to weak verbal abilities or weak basic reading skills, as to impairments of working memory and processing speed characteristic of ADHD;and 2) that extended time on a test of reading comprehension would yield significantly higher reading comprehension scores than would standard time. Method: Charts of 145 adolescents 13-18 years diagnosed with DSM-IV ADHD and no specific reading disorder after a comprehensive clinical and psycho-educational evaluation, were reviewed to extract 1) word reading and word attack subtest scores from the Woodcock-Johnson Achievement Test or the Wechsler Individual Achievement Test;2) Index scores from WISC-IV or WAIS-III IQ tests;3) scores from the Nelson-Denny Reading Test. Results: Mean index scores for verbal comprehension abilities not including reading were in the high average range, but working memory and processing speed index scores were significantly weaker. Under standard time limits 53% were unable to complete the reading comprehension test and only 42.8% were able to score within 1 SD of their IQ verbal comprehension index (VCI). When allowed extended time, 77.9% were able to score within 1 SD of their VCI. T-test comparisons between standard time and extended time were significant at < 0.001. Conclusions: Allowing extended time for adolescents with ADHD to complete tests involving reading may help to compensate for their impairments of working memory and processing speed, allowing them to score closer to their actual verbal abilities.

关键词： ADHD Reading Comprehension Extended Time Working Memory Processing Speed

Phosphorylated Salicylic Acid as Flame Retardant in Epoxy Resins and Composites

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Journal of Renewable Materials 2022年第7期10卷 1931-1950页

作者： Lara Greiner philipp Kukla Sebastian Eibl Manfred Döring Bundeswehr Research Institute for Materials Fuels and LubricantsErding85435Germany Fraunhofer Institute for Structural Durability and System Reliability LBF Darmstadt64289Germany Schill+Seilacher GmbH Böblingen71032Germany

A novel,versatile flame retardant substructure based on phosphorylated salicylic acid(SCP)is described and used in the synthesis of new flame retardants for HexFlowRTM6,a high-performance epoxy resin used in resin transfer molding processes as composite *** starting material salicylic acid can be obtained from natural *** as reactive phosphorus chloride is converted with a novolak,a novolak containing 9,10-dihydro-9-oxa-10-phospha-phenanthrene-10-oxide(DOPO)substituents or DOPO-hydroquinone to flame retardants with sufficient thermal stability and high char ***,these flame retardants are soluble in the resin as well as react into the epoxy *** determined thermal stability and glass transition temperatures of flame retarded neat resin samples as well as the interlaminar shear strength of corresponding carbon fiber reinforced composite materials showed the applicability of these flame *** resin samples and composites were tested for their flammability by UL94 and/or flame-retardant performance by cone *** tested flame retardants decrease the peak of heat release rate by up to 54%for neat resin samples.A combination of DOPO and SCP in one flame retardant shows synergistic effects in char formation and the mode of action adapts to neat resin or fiber-reinforced samples,so there is efficient flame retardancy in both ***,a tailoring of SCP based flame retardants is ***,these flame retardants efficiently reduce fiber degradation during combustion of carbon fiber-reinforced epoxy resins as observed by scanning electron microscopy and energy dispersive X-ray spectroscopy.

关键词： Epoxy resin composite fiber protection bio-based flame retardant

Machine perfusion strategies in liver transplantation

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Hepatobiliary Surgery and Nutrition 2019年第5期8卷 490-501页

作者： Andrea Schlegel Xavier Muller philipp Dutkowski Liver Unit Queen Elizabeth HospitalUniversity Hospitals Birmingham NHS Foundation TrustBirminghamUK Centre for Liver and Gastrointestinal Research Institute of Immunology and ImmunotherapyCollege of Medical and Dental SciencesUniversity of BirminghamBirminghamUK Department of Surgery and Transplantation University Hospital ZurichZurichSwitzerland

Machine perfusion is a hot topic in liver transplantation and several new perfusion conceptsare currently *** to introduction into routine clinical practice,however,such perfusionapproaches need to demonstrate their impact on liver function,post-transplant complications,utilizationrates of high-risk organs,and cost ***,based on results of experimental and clinical studies,the community has to recognize the limitations of this *** this review,we summarize currentperfusion concepts and differences between protective mechanisms of ex-and in-situ perfusion ***,we discuss which graft types may benefit most from perfusion techniques,and highlight the currentunderstanding of liver viability ***,we present results from recent clinical trials involvingmachine liver perfusion,and analyze the value of different outcome parameters,currently used as endpointsfor randomized controlled trials in the field.

关键词： Machine perfusion clinical trials viability assessment