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Extramedullary plasmacytoma with the uvula as first affected site:A case report

World Journal of Clinical Oncology 2025年第1期16卷 53-58页

作者： Jing Yang Hui Peng Sheng-Ke tu Min Li Kui Song Department of Hematology The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina Department of Pharmacy The First Affiliated Hospital of Jishou UniversityJishou 416000Hunan ProvinceChina

BACKGROUND Extramedullary plasmacytoma(EMP)represents one of the rarer forms of plasma cell malignancies,capable of impacting a variety of tissues and organs throughout the *** majority of EMP cases are predominantly found in the head and neck region,especially within the laryngopharynx,as well as in the gastrointestinal *** there have been documented instances of oropharyngeal involvement in EMP cases in the academic literature,it is important to note that EMP specifically affecting the uvula is exceedingly ***,it is noteworthy that over 60% of epithelial carcinomas in the upper respiratory tract and oropharynx tend to metastasize to the cervical lymph nodes,indicating a propensity for regional spread in these types of *** this context,we present a rare case of extramedullary plasmacytoma where the uvula served as the initially affected *** case emphasizes the need for heightened awareness among clinicians regarding such unusual comorbidities,as early recognition and diagnosis can significantly influence patient management and treatment *** addition,a review of the relevant literature is included to further educate and inform healthcare professionals about this rare presentation,ultimately aiming to enhance clinical understanding and improve patient care in similar *** SUMMARY A 51-year-old man was admitted to our hospital because of a slowly enlarging neck mass.A physical examination revealed a palpable left lymph node,and magnetic resonance imaging(MRI)of the oropharynx and the neck showed a soft tissue mass in the oropharynx and enlargement of multiple lymph nodes in the *** soft tissue mass was diagnosed as plasmacytoma by immunohistochemical *** immunoglobulins and bone marrow biopsy showed normal ***,we diagnosed that as EMP of the *** four cycles of adjuvant chemotherapy dominated by bortezomib,MRI reexamination showed a significant reduction of the mass

关键词： Extramedullary plasmacytoma Plasmacytoma Uvula Multiple myeloma Case report

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柳江盆地髫髻山组凝灰岩地球化学与熔体包裹体水含量特征

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岩矿测试 2025年第1期44卷 88-101页

作者：赵汇珍陈勇涂聪冯艳伟中国石油大学(华东)深层油气全国重点实验室山东青岛266580 中国石油大学(华东)地球科学与技术学院山东青岛266580 中国科学技术大学地球和空间科学学院安徽合肥230026

水作为岩浆体系中最主要的挥发组分,对岩浆的形成和演化有重要的影响,柳江盆地髫髻山组岩浆岩是燕山期火山活动的重要产物,尽管前人对其地球化学特征进行了大量研究,但关于柳江盆地燕山期岩浆中的水含量仍不清楚。熔体包裹体记录了原始... 详细信息

水作为岩浆体系中最主要的挥发组分,对岩浆的形成和演化有重要的影响,柳江盆地髫髻山组岩浆岩是燕山期火山活动的重要产物,尽管前人对其地球化学特征进行了大量研究,但关于柳江盆地燕山期岩浆中的水含量仍不清楚。熔体包裹体记录了原始岩浆信息,是获取岩浆水含量特征的最直接样品。本文基于全岩地球化学分析,利用标准样品建立了显微激光拉曼光谱定量熔体包裹体水含量的标定曲线,并对柳江盆地髫髻山组下部流纹质岩屑-晶屑凝灰岩中石英斑晶内的原生熔体包裹体进行了水含量定量分析。结果表明:髫髻山组下部凝灰岩样品具有富Si、Al、大离子亲石元素富集、高场强元素亏损、轻稀土富集、重稀土亏损、负Eu异常、Sr含量低等特点;熔体包裹体中水含量的定量分析结果为0.99%~4.98%,平均水含量为2.62%,与前人统计的酸性岩浆水含量基本一致。地球化学特征和熔体包裹体水含量分析结果共同揭示了研究区髫髻山期早期为富水酸性岩浆。结合髫髻山期样品的熔体包裹体水含量测定结果及其早期的大规模火山喷发背景,本文认为岩浆中高含水量增强了岩浆系统的喷发动力,是诱发研究区髫髻山期早期大规模火山爆发的有利因素之一。

关键词：柳江盆地髫髻山组凝灰岩熔体包裹体水含量显微激光拉曼光谱法

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Mechanisms of support failure and prevention measures under double-layer room mining gobs——A case study: Shigetai coal mine

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International Journal of Mining Science and Technology 2019年第6期29卷 955-962页

作者： Defu Zhu Shihao tu Hongsheng tu Zhenqian Yang State Key Laboratory of Deep Coal Resource China University of Mining and Technology

In the practice of mining shallow buried ultra-close seams,support failure tends to occur during the process of longwall undermining beneath two layers of room mining goaf(TLRMG).In this paper,the factors causing support failure are summarized into geology and mining *** column lithology and composite beam theory,the key stratum of the rock strata is determined.A finite element numerical simulation is used to analyze the overlying load distribution rule of the main roof for different plane positions of the upper and lower room mining *** tributary area theory(TAT)is adopted to analyze the vertical load distribution of each pillar,and dynamic models of coal pillar instability and main roof fracture are *** key block instability analysis,two critical moments are established,of which critical moment A has the greater dynamic load *** economic losses and safety hazards are created by the dynamic load of the fracturing of the main *** reduce these negative effects,a method of pulling out supports is developed and two alternative measures for support failure prevention are proposed:reinforcing stope supports in conjunction with reducing mining height,or drilling ground holes to pre-split the main *** on a comprehensive consideration of economic factors and the two categories of support failure causes,the method of reinforcing stope supports while reducing mining height was selected for use on the mining site.

关键词： Multiple room mining goaf Mechanism of supports failure Numerical simulation Prevention measure

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Creep behavior of plasma sprayed NiCr and NiCrAl coating-based systems

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Acta Metallurgica Sinica(English Letters) 2011年第3期24卷 183-189页

作者： Shan-tung tu Key Laboratory of Safety Science of Pressurized System Ministry of EducationEast China University of Science and Technology

The creep behavior of the plasma sprayed NiCr and NiCrA1 coating/Nickel alloy 690 substrate systems at 1033 K was investigated. Results showed that there was almost no difference in the creep lives between the NiCr and NiCrA1 coated specimens at a given stress level, since the contents of Cr used in the NiCr and NiCrA1 powders are almost same. The relationship between the minimum creep rate and the applied stress followed the well-known Norton＇s power law, εmin=Aσ^n, with the values of A=2.66×10^-16 MPa^-n·h^-1 and n=6.48. The relation between the applied stress and time to rupture of the coated specimens can be estimated by using Larson-Miller equation. The θ projection method can be used to accurately characterize the creep behavior of the coated specimens.

关键词： Creep Coating θ projection method Minimum creep strainrate

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Creep crack growth in a Cr-Mo-V type steel: experimental observation and prediction

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Acta Metallurgica Sinica(English Letters) 2011年第2期24卷 81-91页

作者： Shan-tung tu Key Laboratory of Safety Science of Pressurized System Ministry of Education School of Mechanical and Power Engineering East China University of Science and Technology

In this study, the creep crack growth （CCG） properties and fracture mechanism of a Cr-Mo-V steel at 566 C in compact tension （CT） specimens were investigated, and the CCG rate was predicted by using the NSW model. The results show that the CCG rate measured by CT specimens is much lower than that predicted by the NSW model under plane-strain state. This means that the NSW model prediction for the CCG rate of the steel is over-conservative. In addition, the CCG rate da/dt versus C measured by the experiments shows the piecewise linear relation on log-log scale instead of a single linear relation predicted by the NSW model. The main reasons for these results are that the actual creep fracture mechanism of the steel and the actual creep crack tip stress field in the CT specimens have not been fully captured in the NSW model. The experimental observation shows that the creep crack propagates in a discontinuous way （step by step） at meso-scale, and the cracks at micro-scale are usually formed by the growth and coalescence of voids on grain boundaries. The NSW model based on the creep ductility exhaustion approach may not correctly describe this creep fracture process. In addition, the opening stress and triaxial stress ahead of crack tips calculated by three-dimensional finite element method is lower than those predicted by the HRR stress field which is used in the NSW model under plane-strain state. The use of the high HRR stress field will cause high CCG rates. The change in the creep fracture mechanism at micro-scale in different ranges of C may cause the piecewise linear relation between the da/dt and C . Therefore, it is necessary to study the actual CCG mechanism in a wide range of C and the actual creep crack tip stress field to establish accurate CCG prediction models.

关键词： Creep crack growth Prediction NSW model Fracture mechanism Finite element method

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Effects of riser geometry on gas-solid flow characteristics in circulating fluidized beds

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Particuology 2020年第2期18卷 205-217页

作者： Qiuya tu Haigang Wang Institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 10090China University of Chinese Academy of Sciences Beijing 100049China

The performance of a circulating fluidized bed strongly depends on its parameter settings,including that of riser *** this study,a laboratory-scale circulating fluidized bed with three different riser geometries(circular,square,and rectangular)that had the same cross-sectional area and height was operated under two static bed heights(20,and 35 cm).Electrical capacitance tomography was combined with differential pressure transducers and an optical-fiber probe to measure the solids'volume fraction,differential pressure fluctuations,and radial particle concentration *** particle fluid dynamics simulations were also *** results showed that single bubbles appeared in the bottom region of the circular and square risers and double bubbles in the bottom region of the rectangular *** autocorrelation of capacitance signals was periodic for the circular and square risers and non-periodic for the rectangular *** radial particle concentration profiles showed a single-core annulus structure in the circular and square risers,but a double-core annulus structure along the long side and single-core annulus structure along the short side in the rectangular *** entropy analysis showed that fluidization was less disordered and most predictable for the rectangular riser.

关键词： Circulating fluidized bed Riser geometry Static bed height Bubble shape Electrical capacitance tomography Computational particle fluid dynamics

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The scaling relationship of leaf area and total mass of sample plots across world trees

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Journal of Forestry Research 2019年第6期30卷 2137-2142页

作者： Chengyi tu Department of Environmental Science Policy and Management University of California

The scaling relationship between leaf area and total mass of plant has important implications for understanding resource allocations in the *** model of West,Brown and Enquist(WBE model)considers that a 3/4 scaling exponent of metabolic rate versus total mass to be optimal for each plant and has been confirmed numerous *** leaf area is a better proxy of the metabolic rate than leaf mass,few studies have focused on the scaling exponent of leaf area versus total mass and even fewer have discussed the diversification of this scaling exponent across different ***,I analyzed the scaling exponent of leaf area versus total mass of sample plots across world plants.I found that as the plant grows,it allocates fewer resources to photosynthetic tissues than expected by the WBE *** results also empirically show that this scaling exponent varies significantly for different plant leaf habit,taxonomic class and geographic ***,leaf strategy in response to environmental pressure and constraint clearly plays a significant role.

关键词： Scaling relationship Leaf area Total mass Standard major axis regression

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ASYMPTOTIC HODGE THEORY IN SEVERAL VARIABLES:THE FLAT CASE

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Chinese Annals of Mathematics,Series B 1997年第3期18卷 277-282页

作者： tu LIHUANG Department of Mathemnatics Shanghai UniversityShanghai 201800China

In the flat case, the answer to the problem posed by Steenbrink and Zucker is given.

关键词： Canonical extenion Gauss Manin connection Monodromy transformation

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Recent advance on the efficiency at maximum power of heat engines

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Chinese Physics B 2012年第2期21卷 36-45页

作者： tu Zhan-Chun Department of Physics Beijing Normal UniversityBeijing 100875China

This review reports several key advances on the theoretical investigations of efficiency at maximum power of heat engines in the past five years. The analytical results of efficiency at maximum power for the Curzon-Ahlborn heat engine, the stochastic heat engine constructed from a Brownian particle, and Feynman＇s ratchet as a heat engine are presented. It is found that： the efficiency at maximum power exhibits universal behavior at small relative temperature differences; the lower and the upper bounds might exist under quite general conditions; and the problem of efficiency at maximum power comes down to seeking for the minimum irreversible entropy production in each finite-time isothermal process for a given time.

关键词： effciency at maximum power heat engine universality bounds

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Abstract models for heat engines

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Frontiers of physics 2021年第3期16卷 99-110页

作者： Zhan-Chun tu Department of Physics Beijing Normal UniversityBeijing100875China

We retrospect three abstract models for heat engines which include a classic abstract model in textbook of thermal physics,a primary abstract model for finite-time heat engines,and a refined abstract model for finite-time heat *** detailed models of heat engines in literature of finite-time thermodynamics may be mapped into the refined abstract *** future developments based on the refined abstract model are also surveyed.

关键词： abstract model heat engine finite-time thermodynamics

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