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A photogrammetric approach for quantifying the evolution of rock joint void geometry under varying contact states

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International Journal of Mining Science and Technology 2024年第4期34卷 461-477页

作者： Rui Yong Changshuo Wang Nick Barton Shigui Du Institute of Rock Mechanics Ningbo UniversityNingbo 315211China Nick Barton&associates Fjordveien 65cHøvik 1363Norway

Accurate measurement of the evolution of rock joint void geometry is essential for comprehending the distribution characteristics of asperities responsible for shear and seepage ***,existing techniques often require specialized equipment and skilled operators,posing practical *** this study,a cost-effective photogrammetric approach is ***,local coordinate systems are established to facilitate the alignment and precise quantification of the relative position between two halves of a rock ***/pull tests are conducted on rock joints with varying roughness levels to induce different contact states.A high-precision laser scanner serves as a benchmark for evaluating the photogrammetry *** certain deviations exist,the measured evolution of void geometry is generally consistent with the qualitative findings of previous *** photogrammetric measurements yield comparable accuracy to laser scanning,with maximum errors of 13.2%for aperture and 14.4%for void *** joint matching coefficient(JMC)measurement errors are below 20%.Larger measurement errors occur primarily in highly mismatched rock joints with JMC values below 0.2,but even in cases where measurement errors exceed 80%,the maximum JMC error is only ***,the proposed photogrammetric approach holds promise for widespread application in void geometry measurements in rock joints.

关键词： Rock joint Void geometry evolution Photogrammetry Aperture Void volume Joint matching coefficient

Metallurgical Forensics: Investigating a Superheater Tube Failure in Industrial Process Plants

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World Journal of Engineering and Technology 2024年第3期12卷 742-758页

作者： Kok Toong Leong Engineering Department QSM Associates Singapore

A metallurgical forensic investigation was conducted to determine the cause of a failed superheater tube. Analysis techniques by Visual Examination, Energy Dispersive X-ray Analysis, Mechanical Testing and Metallographic Investigation were conducted, together with a comparative study from an inlet elbow section that did not fail. The superheater tube suffered premature failure after being in service for about two years. It was concluded that the failed tube underwent overheating, corrosion-erosion, embrittlement, and eventual failure under its internal pressure by stress rupture. The analysis revealed intergranular cracks, window fracture features and spheroidization of pearlite with grain growth. A possible contribution to embrittlement was from copper. Follow-ups and recommendations were provided, as well as covering materials, inspection, and operational considerations.

关键词： Superheater Tubes Thermal Degradation Corrosion-Erosion Embrittlement Stress Rupture

The Effect of Preloading on the Cyclic Liquefaction Strength Measured in the Laboratory

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Journal of Civil Engineering and Architecture 2024年第6期18卷 269-275页

作者： Konstantinos Stamatopoulos Stamatopoulos and associates 5 Isavron StreetAthens 11471Greece

The effect of preloading on the liquefaction cyclic strength was investigated by cyclic shear tests where horizontal shear stress oscillated about a zero mean value on sands with varying fines content and at varying prestress ratios, densities and verticalstresses. Test results showed a marked increase of the cyclic soil strength with the prestress ratio. The effect is more pronounced for the looser specimens. An empirical expression predicting this effect is proposed. This expression is validated from results of a field test.

关键词： Cyclic liquefaction shear stress field test

Possible Cortical Spreading Depression Recorded Intraoperatively Following a Generalized Seizure: Illustrative Case

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Neuroscience & Medicine 2024年第3期15卷 119-128页

作者： Greg Schaublin Romina Shirka Nabil Azar Callan Broderick Jayson Neil George R. Lee Kiara Ebinger Real Time Neuromonitoring associates Nashville USA Real Time Tele-Epilepsy Consultants Nashville USA Seastnan Medical LLC Kansas City USA Midwest Neurosurgery associates Kansas City USA Research Medical Center Kansas City USA

Background: We present a compelling case fitting the phenomenon of cortical spreading depression detected by intraoperative neurophysiological monitoring (IONM) following an intraoperative seizure during a craniotomy for revascularization. Cortical spreading depression (CSD, also called cortical spreading depolarization) is a pathophysiological phenomenon whereby a wave of depolarization is thought to propagate across the cerebral cortex, creating a brief period of relative neuronal inactivity. The relationship between CSD and seizures is unclear, although some literature has made a correlation between seizures and a cortical environment conducive to CSD. Methods: Intraoperative somatosensory evoked potentials (SSEPs) and electroencephalography (EEG) were monitored continuously during the craniotomy procedure utilizing standard montages. Electrophysiological data from pre-ictal, ictal, and post-ictal periods were recorded. Results: During the procedure, intraoperative EEG captured a generalized seizure followed by a stepwise decrease in somatosensory evoked potential cortical amplitudes, compelling for the phenomenon of CSD. The subsequent partial recovery of neuronal function was also captured electrophysiologically. Discussion: While CSD is considered controversial in some aspects, intraoperative neurophysiological monitoring allowed for the unique analysis of a case demonstrating a CSD-like phenomenon. To our knowledge, this is the first published example of this phenomenon in which intraoperative neurophysiological monitoring captured a seizure, along with a stepwise subsequent reduction in SSEP cortical amplitudes not explained by other variables.

关键词： Cortical Spreading Depression Electroencephalography Intraoperative Neurophysiological Monitoring Seizure

历史与现代碰撞交融——西安海荣JW万豪酒店

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中国建筑装饰装修 2024年第7期 44-49页

作者：吕锦明 Hirsch Bedner associates(HBA)

经过3000多年悠久历史的洗礼与13个朝代的更迭,西安犹如一幅史诗般的画卷,在时光洪流中沉淀,孕育出兼容并蓄、百花齐放的华夏文明。HBA香港团队在这富有深厚文化底蕴的画卷中运用承载着历史与文化记忆的材料、结构和造型元素,结合现代... 详细信息

经过3000多年悠久历史的洗礼与13个朝代的更迭,西安犹如一幅史诗般的画卷,在时光洪流中沉淀,孕育出兼容并蓄、百花齐放的华夏文明。HBA香港团队在这富有深厚文化底蕴的画卷中运用承载着历史与文化记忆的材料、结构和造型元素,结合现代艺术手法,赋予空间独特的生命力,让八方宾客在古今交融的氛围中,感受城市发展的魅力。踏入西安海荣JW万豪酒店的大堂,一件引人注目的当代艺术品《历史的马车》仿佛迎面徐徐奔来,引领众人踏上这段历史与现代碰撞交融的旅程。

关键词：当代艺术品华夏文明造型元素兼容并蓄海荣百花齐放历史与文化历史与现代

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隐藏世界——上海滴水湖洲际酒店

中国建筑装饰装修 2024年第5期 17-23+16页

作者： Sabine Beck Hirsch Bedner associates (HBA)

这座位于上海临港新城的豪华型湖滨度假酒店是独岛酒店,有着“一岛一酒店”的美称。酒店前身为滴水湖皇冠假日酒店,其建筑造型别致,宛若一朵在湖水上盛开的桃花临湖亲水,景致迷人。本次翻新设计以“隐藏世界”为概念,打造宛如一扇连接...

这座位于上海临港新城的豪华型湖滨度假酒店是独岛酒店,有着“一岛一酒店”的美称。酒店前身为滴水湖皇冠假日酒店,其建筑造型别致,宛若一朵在湖水上盛开的桃花临湖亲水,景致迷人。本次翻新设计以“隐藏世界”为概念,打造宛如一扇连接陆地和水域并通往海洋世界的门户,带给入住客人沉浸于想象和探索之境的体验。

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Buechel Pappas Resurfacing Shoulder Replacement: Evolution and over 40 Years of Clinical Experience

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Open Journal of Orthopedics 2024年第5期14卷 218-228页

作者： Frederick F. Buechel Michael J. Pappas Rutgers NJ Medical School Newark NJ USA South Mountain Orthopaedic associates South Orange NJ USA New Jersey Institute of Technology Newark NJ USA

Background: Early exploration of the semi constrained “Floating-Socket” total shoulder replacement (TSR) in 1974 led to a proliferation of various unconstrained designs that allowed resection or retention of the humeral head, depending upon the pathological process involved. Degenerative glenohumeral arthritis with mild to moderate involvement of subchondral bone allowed for a resurfacing option, while severe humeral head involvement required a partial or full humeral head replacement attached to an intramedullary stem for fixation. All components evolved from cemented to cementless application by 1982. The purpose of this paper is to describe the progression of Buechel-Pappas (B-P) shoulder replacement development from the early 1970’s in both cemented and cement less applications. Methods: Clinical evaluations of “Floating-Socket” TSR, followed by B-P stem-type, resurfacing types, bipolar-type and revision components, all of which comprise the B-P Shoulder Replacement System, were performed over a 49-year period. Results: “Floating-Socket” implants improved the results of simple, constrained ball-in-socket designs, but generally failed by glenoid component loosening in both chimpanzee and human applications. Unconstrained resurfacing-type components, both anatomical humeral head and full proximal humeral components, were quite successful, with minimal failures observed in long-term studies. Bipolar salvage implants, used for severe proximal deficiencies, revisions and massive rotator cuff arthropathy, were also very successful;providing overhead range of motion in many patients. Conclusions: Resurfacing hemiarthroplasty, in patients with intact or repairable rotator cuff mechanisms, gave the most satisfactory results and were the least technically complicated to perform, requiring minimal instrumentation. Resurfacing of full proximal humeral deficiencies, using femoral resurfacing components, gave similar clinical results to more complex semi-constrained devices,

关键词： Total Shoulder Replacement Resurfacing Shoulder Replacement

A Case of Esophageal Perforation Presenting as Cavitary Pneumonia: Diagnostic and Therapeutic Challenges

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Open Journal of Gastroenterology 2024年第7期14卷 241-247页

作者： Feruza Abraamyan Harpreet Singh Vishal Raj Inder M. Singh Internal Medicine Department Sutter Roseville Medical Center Roseville CA USA Pulmonary Medicine associates Sutter Roseville Medical Center Roseville CA USA Gastroenterology Department Sutter Roseville Medical Center Roseville CA USA

Esophageal perforation, a rare condition, can arise from iatrogenic, traumatic, or spontaneous origins. Even when therapy is initiated within the first 24 hours, it is associated with a mortality rate of up to 25%. Due to the varied initial presentation, treatment may be delayed, leading to poorer outcomes. Here, we present a unique case of a 27-year-old schizophrenic patient who initially presented with acute respiratory failure and septic shock and was ultimately diagnosed with cavitary pneumonia secondary to esophageal perforation.

关键词： Esophageal Perforation Foreign Body Esophageal Stent Cavitary Pneumonia Septic Shock Respiratory Failure

Forgotten node:A case report

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World Journal of Gastroenterology 2009年第39期15卷 4974-4975页

作者： Patrick M Fratellone Melissa A Holowecki Fratellone Medical associates

Sister Mary Joseph nodule or node refers to a palpable nodule bulging into the umbilicus and is usually a result of a malignant cancer in the pelvis or *** it has been considered a sign of ominous *** malignancies,most commonly gastric,colon and pancreatic cancer account for about 52% of the underlying *** cancers,most commonly ovarian and uterine cancers account for about 28% of the sources.

关键词： Umbilical node Sister Mary Joseph node Gastroenterology Gastric malignancies Endometriosis