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Translocator protein and neurodegeneration: insights from Alzheimer’s disease
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作者 Arpit Kumar Pradhan Rainer Rupprecht Gerhard Rammes 《Neural Regeneration Research》 SCIE CAS 2025年第4期1090-1091,共2页
The 18 kDa translocator protein(TSPO)located on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and main... The 18 kDa translocator protein(TSPO)located on the outer mitochondrial membrane regulates several key cellular processes including mitochondrial homeostasis,cholesterol transport,apoptosis,cell proliferation,and maintenance of mitochondrial health(Rupprecht et al.,2022,2023).TSPO is expressed in both peripheral organs and the central nervous system,with a more pronounced expression in tissues that produce steroids.The main reason why TSPO has garnered so much attention is because it plays a key role in neurosteroidogenesis by transferring cholesterol from the outer to the inner mitochondrial membrane,which is the rate-limiting step in neurosteroid synthesis.A cholesterol-recognizing amino acid consensus domain has been identified in the cytosolic C terminus of the TSPO protein by both in vitro and site-directed mutagenesis experiments(Li et al.,2001).However,the role of TSPO in the process of neurosteroid synthesis has been challenged by several studies,particularly TSPO knockout models,which suggest that TSPO removal does not affect the phenotype or the system’s viability(Tu et al.,2014).However,ligands targeting TSPO have been shown to enhance levels of neurosteroids which suggests that neurosteroidogenesis is one of the major functional roles mediated by the TSPO protein. 展开更多
关键词 CHOLESTEROL ORGANS
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Prevalence and risk of progression of pancreatic cystic lesions in immunosuppressed patients:A systematic review and meta-analysis
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作者 Maximilian Kießler Helmut Friess Volker Assfalg 《World Journal of Transplantation》 2025年第2期320-327,共8页
BACKGROUND Pancreatic cystic lesions are common in patients eligible for solid organ transplan-tation.It has been shown that the need for immunosuppression after organ transplantation increases the rate of malignancie... BACKGROUND Pancreatic cystic lesions are common in patients eligible for solid organ transplan-tation.It has been shown that the need for immunosuppression after organ transplantation increases the rate of malignancies in organ recipients.However,the impact of immunosuppression on pancreatic cystic lesions is yet unknown.AIM To evaluate the prevalence of pancreatic cystic lesions and the risk of cyst progression in immunosuppressed patients.METHODS A systematic literature search was performed in relevant databases.Studies reporting either on the prevalence and/or the incidence of pancreatic cyst progression compared to a control group were implemented in the first systematic review and meta-analysis on this topic.RESULTS The prevalence of pancreatic cystic lesions was comparable with 7%(95%CI:5%-11%)in the immunosuppressed cohort and 9%(95%CI:5%-16%)in the control cohort.The mean cyst size increase in the immunosuppression group was 3.2 mm(range 1.0-5.2mm)compared to 3.5 mm(1.0-6.9)in the control group(standar-dized mean difference 0.0 mm,95%CI:-0.3-0.2 mm,P=0.72).There was also no significant increase in the development of resection criteria or worrisome features under immunosuppression either[relative risk 1.1(fixed effect model),1.2(ran-dom effects model),P=0.61].CONCLUSION Immunosuppression does not increase the prevalence of pancreatic cystic lesions,nor does it increase the risk of cyst progression in terms of cyst size and development of resection criteria.Therefore,pancreatic cystic lesions in transplant candidates should not be a contraindication for solid organ transplantation. 展开更多
关键词 Pancreatic cystic lesions Intraductal papillary mucinous neoplasm IMMUNOSUPPRESSION Organ transplantation Systematic review
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On the Edge of Eternity
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作者 Martina Kölbl-Ebert 《Episodes》 2025年第1期131-132,共2页
In popular history of science,we find the persistent narrative that traditionally Western Culture over centuries regarded the age of the Earth as brief-but a few thousand years old-and that it was scientific progress ... In popular history of science,we find the persistent narrative that traditionally Western Culture over centuries regarded the age of the Earth as brief-but a few thousand years old-and that it was scientific progress basically during the 19th century that extended this timescale against opposition from religious zealots to encompass millions of years and finally with radiometric dating to some 4.5 billion years.This popular history of Deep Time sees geoscience in continuous struggle with religious fundamentalism. 展开更多
关键词 GEOSCIENCE scientific progress religious zealots popular history deep time radiometric dating earth deep time religious fundamentalism
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Needle detection and localisation for robot-assisted subretinal injection using deep learning
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作者 Mingchuan Zhou Xiangyu Guo +7 位作者 Matthias Grimm Elias Lochner Zhongliang Jiang Abouzar Eslami Juan Ye Nassir Navab Alois Knoll Mohammad Ali Nasseri 《CAAI Transactions on Intelligence Technology》 2025年第3期703-715,共13页
Subretinal injection is a complicated task for retinal surgeons to operate manually.In this paper we demonstrate a robust framework for needle detection and localisation in robotassisted subretinal injection using mic... Subretinal injection is a complicated task for retinal surgeons to operate manually.In this paper we demonstrate a robust framework for needle detection and localisation in robotassisted subretinal injection using microscope-integrated Optical Coherence Tomography with deep learning.Five convolutional neural networks with different architectures were evaluated.The main differences between the architectures are the amount of information they receive at the input layer.When evaluated on ex-vivo pig eyes,the top performing network successfully detected all needles in the dataset and localised them with an Intersection over Union value of 0.55.The algorithm was evaluated by comparing the depth of the top and bottom edge of the predicted bounding box to the ground truth.This analysis showed that the top edge can be used to predict the depth of the needle with a maximum error of 8.5μm. 展开更多
关键词 deep learning optical coherence tomography robot-assisted surgery subretinal injection
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vip Editorial:Special Issue on Al Technologies and Applications in Medical Robots
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作者 Xiaozhi Qi Zhongliang Jiang +1 位作者 Ying Hu Jianwei Zhang 《CAAI Transactions on Intelligence Technology》 2025年第3期635-637,共3页
The integration of artificial intelligence(AI)into medical robotics has emerged as a cornerstone of modern healthcare,driving transformative advancements in precision,adaptability and patient outcomes.Although computa... The integration of artificial intelligence(AI)into medical robotics has emerged as a cornerstone of modern healthcare,driving transformative advancements in precision,adaptability and patient outcomes.Although computational tools have long supported diagnostic processes,their role is evolving beyond passive assistance to become active collaborators in therapeutic decision-making.In this paradigm,knowledge-driven deep learning systems are redefining possibilities-enabling robots to interpret complex data,adapt to dynamic clinical environments and execute tasks with human-like contextual awareness. 展开更多
关键词 diagnostic processestheir medicalrobotics artificial intelligence ai interpret complex dataadapt medical robotics deeplearning computational tools precisionmedicine
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A low-cost and high-energy aqueous potassium-ion battery
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作者 Raphael L.Streng Tim Steeger +10 位作者 Anatoliy Senyshyn Steffen Abel Peter Schneider Christine Benning Bernardo Miller Naranjo David Gryc Mian Zahid Hussain Oliver Lieleg Martin Elsner Aliaksandr S.Bandarenka Katarina Cicvaric 《Journal of Energy Chemistry》 2025年第7期523-531,共9页
To address challenges related to the intermittency of renewable energy sources,aqueous potassium-ion batteries(AKIBs)are a promising and sustainable alternative to conventional systems for large-scale energy storage.T... To address challenges related to the intermittency of renewable energy sources,aqueous potassium-ion batteries(AKIBs)are a promising and sustainable alternative to conventional systems for large-scale energy storage.To enable their practical application,maximizing energy density and longevity while minimizing production and material costs is a key goal.In this work,we propose an AKIB consisting only of abundant and cost-efficient materials,which delivers a high energy density of more than 70 Wh kg^(-1).We combine simple strategies to stabilize the Mn-rich Prussian blue analog cathode by Fe-doping,improving the crystallinity,and tuning the electrolyte composition without employing expensive water-in-salt electrolytes.Using a mixed 2.5 M Ca(NO_(3))_(2)+1.5 M KNO_(3)electrolyte,we assemble a novel AKIB with a Fe-doped manganese hexacyanoferrate cathode and an organic poly(naphthalene-4-formylethylenediamine)anode.Besides a high energy density,the full cell delivers a specific capacity of approximately 60 mAhg^(-1),a power density of 5000 W kg^(-1),and 80% capacity retention after 600 cycles. 展开更多
关键词 Aqueous Battery ELECTROLYTE POTASSIUM CALCIUM
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Probing the Warm and Hot Absorbers along the Sightline of PG 0052+251
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作者 Zheng Zhou Junjie Mao +5 位作者 Taotao Fang Yijun Wang Jiayi Chen Fabrizio Nicastro Kaile Wang Yi Zhang 《Research in Astronomy and Astrophysics》 2025年第7期102-110,共9页
We analyze the absorption features in the public 73 ks XMM-Newton spectra of the Seyfert 1 galaxy PG 0052+251.Our analysis reveals the presence of a warm absorber(WA)intrinsic to the source and the hot circumgalactic ... We analyze the absorption features in the public 73 ks XMM-Newton spectra of the Seyfert 1 galaxy PG 0052+251.Our analysis reveals the presence of a warm absorber(WA)intrinsic to the source and the hot circumgalactic medium at zero redshift.The identified WA is inflowing toward the central black hole,with a velocity shift of■.The ionization parameter of the WA is■,showing strong O II and O III absorption lines,along with a significant absorption of the spectral continuum at?10?.The line of sight toward PG 0052+251 intersects the halo of M31 at an impact parameter of approximately 218 kpc.Several local(z~0)absorption lines,like O VII,O VIII,and Ne IX,were detected.The derived hydrogen column density of the local hot gas is 2.2–2.6σhigher than those estimated by several models of the Galactic hot halo,suggesting a likely contribution from the M31 halo.We also find two absorption features at24.305?and 21.410?,which are unlikely to be associated with the hot halos or the warm-hot intergalactic medium but imply the presence of an additional WA component with an outflow velocity of approximately-7000 km s^(-1). 展开更多
关键词 (galaxies:)quasars:individual(PG 0052+251) (galaxies:)quasars:absorption lines galaxies:halos galaxies:individual(M31) X-rays:galaxies
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Theoretical investigation on axial cyclic performance of monopile in sands using interface constitutive models 被引量:1
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作者 Pan Zhou Jingpei Li +2 位作者 Kaoshan Dai Stefan Vogt Seyedmohsen Miraei 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2024年第7期2645-2662,共18页
Cyclic loads generated by environmental factors,such as winds,waves,and trains,will likely lead to performance degradation in pile foundations,resulting in issues like permanent displacement accumulation and bearing c... Cyclic loads generated by environmental factors,such as winds,waves,and trains,will likely lead to performance degradation in pile foundations,resulting in issues like permanent displacement accumulation and bearing capacity attenuation.This paper presents a semi-analytical solution for predicting the axial cyclic behavior of piles in sands.The solution relies on two enhanced nonlinear load-transfer models considering stress-strain hysteresis and cyclic degradation in the pile-soil interaction.Model parameters are calibrated through cyclic shear tests of the sand-steel interface and laboratory geotechnical testing of sands.A novel aspect involves the meticulous formulation of the shaft loadtransfer function using an interface constitutive model,which inherently inherits the interface model’s advantages,such as capturing hysteresis,hardening,degradation,and particle breakage.The semi-analytical solution is computed numerically using the matrix displacement method,and the calculated values are validated through model tests performed on non-displacement and displacement piles in sands.The results demonstrate that the predicted values show excellent agreement with the measured values for both the static and cyclic responses of piles in sands.The displacement pile response,including factors such as bearing capacity,mobilized shaft resistance,and convergence rate of permanent settlement,exhibit improvements compared to non-displacement piles attributed to the soil squeezing effect.This methodology presents an innovative analytical framework,allowing for integrating cyclic interface models into the theoretical investigation of pile responses. 展开更多
关键词 PILES Cyclic degradation Load-transfer models Interface constitutive model Semi-analytical solution Model tests
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High-Performance and Large-Area Inverted Perovskite Solar Cells Based on NiO_(x) Films Enabled with A Novel Microstructure-Control Technology
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作者 Guibin Shen Xin Li +7 位作者 Yuqin Zou Hongye Dong Dongping Zhu Yanglin Jiang Xin Ren Ng Fen Lin Peter Müller-Buschbaum Cheng Mu 《Energy & Environmental Materials》 SCIE EI CAS CSCD 2024年第1期153-159,共7页
The improvement in the efficiency of inverted perovskite solar cells(PSCs)is significantly limited by undesirable contact at the NiO_(x)/perovskite interface.In this study,a novel microstructure-control technology is ... The improvement in the efficiency of inverted perovskite solar cells(PSCs)is significantly limited by undesirable contact at the NiO_(x)/perovskite interface.In this study,a novel microstructure-control technology is proposed for fabrication of porous NiO_(x)films using Pluronic P123 as the structure-directing agent and acetylacetone(AcAc)as the coordination agent.The synthesized porous NiO_(x)films enhanced the hole extraction efficiency and reduced recombination defects at the NiO_(x)/perovskite interface.Consequently,without any modification,the power conversion efficiency(PCE)of the PSC with MAPbl_(3)as the absorber layer improved from 16.50%to 19.08%.Moreover,the PCE of the device composed of perovskite Cs0.05(MA_(0.15)FA_(0.85))_(0.95)Pb(I_(0.85)Br_(0.15))_(3)improved from 17.49%to 21.42%.Furthermore,the application of the fabricated porous NiO_(x)on fluorine-doped tin oxide(FTO)substrates enabled the fabrication of large-area PSCs(1.2 cm^(2))with a PCE of 19.63%.This study provides a novel strategy for improving the contact at the NiO_(x)/perovskite interface for the fabrication of high-performance large-area perovskite solar cells. 展开更多
关键词 interfacial contact inverted and large-area perovskite solar cells photovoltaic materials porous NiO_(x)films renewable energy
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Ageing-related bone and immunity changes:insights into the complex interplay between the skeleton and the immune system 被引量:2
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作者 Bobin Mi Yuan Xiong +6 位作者 Samuel Knoedler Michael Alfertshofer Adriana C.Panayi Haixing Wang Sien Lin Gang Li Guohui Liu 《Bone Research》 SCIE CAS CSCD 2024年第3期502-516,共15页
Ageing as a natural irreversible process inherently results in the functional deterioration of numerous organ systems and tissues,including the skeletal and immune systems.Recent studies have elucidated the intricate ... Ageing as a natural irreversible process inherently results in the functional deterioration of numerous organ systems and tissues,including the skeletal and immune systems.Recent studies have elucidated the intricate bidirectional interactions between these two systems. 展开更多
关键词 SKELETON INSIGHT IRREVERSIBLE
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Industrialization,Efficiency and Social Housing:Sustainable Prefabrication for the Colombian Social and Cultural Context
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作者 Alejandro Restrepo Montoya 《Journal of Civil Engineering and Architecture》 2024年第2期92-99,共8页
This research aims to generate processes of industrialization and qualification of social housing in Colombia through prefabrication,low energy consumption and high environmental quality to reduce the current deficit ... This research aims to generate processes of industrialization and qualification of social housing in Colombia through prefabrication,low energy consumption and high environmental quality to reduce the current deficit and improve the quality of life in communities with fewer economic resources.Modular coordination and the use of materials with thermal behaviors,appropriate to the country’s climatic characteristics,reduce production costs,avoid waste and improve the architectural and environmental quality of social housing.Passive cooling strategies,such as controlling solar incursion and generating natural cross ventilation eliminate energy consumption and allow reaching desired standards of comfort.In a context in which traditional construction systems have still not resolved the social housing deficit in Colombia and which generate high costs for energy consumption in the search for thermal comfort,industrialized and efficient construction with high environmental quality provides solutions according to the economic,geographic,social and cultural context in Colombia. 展开更多
关键词 EFFICIENCY INDUSTRIALIZATION social housing SUSTAINABILITY low energy consumption
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Determinants of conventional and digital investment advisory decisions:a systematic literature review
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作者 Fabian Wagner 《Financial Innovation》 2024年第1期3636-3667,共32页
The growing demand for digital investment advisory services and the advancing technological process led to increased attention to this topic in recent literature.In light of these developments,the question arises whet... The growing demand for digital investment advisory services and the advancing technological process led to increased attention to this topic in recent literature.In light of these developments,the question arises whether conventional and digital advisors behave differently in their investment advisory decisions.I therefore conducted a systematic literature review and evaluated 97 publications on the determinants of conventional and digital investment advisory decisions.Based on the literature,five main determinants were identified that are important for investment advisory decisions.These determinants are identical for both variants of the advice,but there are differences in the way they are addressed.This systematic literature review provides an overview of the current state of research and can therefore help identify areas where investment advice can be improved in the future. 展开更多
关键词 Investment advisory decisions Investment advice Robo-advice Conventional advice DIFFERENCES
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Regulatory T cells in skin regeneration and wound healing
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作者 Samuel Knoedler Leonard Knoedler +7 位作者 Martin Kauke-Navarro Yuval Rinkevich Gabriel Hundeshagen Leila Harhaus Ulrich Kneser Bohdan Pomahac Dennis P.Orgill Adriana C.Panayi 《Military Medical Research》 SCIE CAS CSCD 2024年第5期663-685,共23页
As the body’s integumentary system,the skin is vulnerable to injuries.The subsequent wound healing processes aim to restore dermal and epidermal integrity and functionality.To this end,multiple tissue-resident cells ... As the body’s integumentary system,the skin is vulnerable to injuries.The subsequent wound healing processes aim to restore dermal and epidermal integrity and functionality.To this end,multiple tissue-resident cells and recruited immune cells cooperate to efficiently repair the injured tissue.Such temporally-and spatially-coordinated interplay necessitates tight regulation to prevent collateral damage such as overshooting immune responses and excessive inflammation.In this context,regulatory T cells(Tregs)hold a key role in balancing immune homeostasis and mediating cutaneous wound healing.A comprehensive understanding of Tregs’multifaceted field of activity may help decipher wound pathologies and,ultimately,establish new treatment modalities.Herein,we review the role of Tregs in orchestrating the regeneration of skin adnexa and catalyzing healthy wound repair.Further,we discuss how Tregs operate during fibrosis,keloidosis,and scarring. 展开更多
关键词 Regulatory T cells(Tregs) Wound healing Wound repair Skin injury Skin regeneration
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Should workers be physically active after work?Associations of leisure-time physical activity with cardiovascular and all-cause mortality across occupational physical activity levels-An individual participant data meta-analysis
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作者 Bart Cillekens Pieter Coenen +40 位作者 Maaike A.Huysmans Andreas Holtermann Richard P.Troiano Paul Jarle Mork Steinar Krokstad Els Clays Dirk De Bacquer Mette Aadahl Line Lund Kårhus Anette Sjøl Lars Bo Andersen Jussi Kauhanen Ari Voutilainen Richard Pulsford Emmanuel Stamatakis Uri Goldbourt Annette Peters Barbara Thorand Annika Rosengren Lena Björck Kyle Sprow Kristin Franzon Miguel Rodriguez-Barranco Leila Luján-Barroso Lars Alfredsson Martin Bahls Till Ittermann Miriam Wanner Matthias Bopp Jacob Louis Marott Peter Schnohr Børge G.Nordestgaarda Knut Eirik Dalene Ulf Ekelund Johan Clausen Magnus T.Jensen Christina Bjørk Petersen Niklas Krause Jos Twisk Willem van Mechelen Allard J.van der Beek 《Journal of Sport and Health Science》 2025年第1期49-60,共12页
Background There is insufficient evidence to provide recommendations for leisure-time physical activity among workers across various occupational physical activity levels.This study aimed to assess the association of ... Background There is insufficient evidence to provide recommendations for leisure-time physical activity among workers across various occupational physical activity levels.This study aimed to assess the association of leisure-time physical activity with cardiovascular and all-cause mortality across occupational physical activity levels.Methods This study utilized individual participant data from 21 cohort studies,comprising both published and unpublished data.Eligibility criteria included individual-level data on leisure-time and occupational physical activity(categorized as sedentary,low,moderate,and high)along with data on all-cause and/or cardiovascular mortality.A 2-stage individual participant data meta-analysis was conducted,with separate analysis of each study using Cox proportional hazards models(Stage 1).These results were combined using random-effects models(Stage 2).Results Higher leisure-time physical activity levels were associated with lower all-cause and cardiovascular mortality risk across most occupational physical activity levels,for both males and females.Among males with sedentary work,high compared to sedentary leisure-time physical activity was associated with lower all-cause(hazard ratios(HR)=0.77,95%confidence interval(95%CI):0.70-0.85)and cardiovascular mortality(HR=0.76,95%CI:0.66-0.87)risk.Among males with high levels of occupational physical activity,high compared to sedentary leisure-time physical activity was associated with lower all-cause(HR=0.84,95%CI:0.74-0.97)and cardiovascular mortality(HR=0.79,95%CI:0.60-1.04)risk,while HRs for low and moderate levels of leisure-time physical activity ranged between 0.87 and 0.97 and were not statistically significant.Among females,most effects were similar but more imprecise,especially in the higher occupational physical activity levels.Conclusion Higher levels of leisure-time physical activity were generally associated with lower mortality risks.However,results for workers with moderate and high occupational physical activity levels,especially women,were more imprecise.Our findings suggests that workers may benefit from engaging in high levels of leisure-time physical activity,irrespective of their level of occupational physical activity. 展开更多
关键词 Mortality Individual participant data Physical activity paradox Job demands
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霸姬蜂属(膜翅目,姬蜂科)一新种 被引量:4
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作者 盛茂领 Klaus SCHNITZER 《动物分类学报》 CSCD 北大核心 2008年第2期391-394,共4页
报道采自宁夏六盘山的霸姬蜂属Barytarbes Frster,18691新种,褐霸姬蜂Barytarbes fulvus Sheng&Schnitzer,sp.nov.。
关键词 膜翅目 姬蜂科 栉足姬蜂亚科 霸姬蜂属 新种
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基于光纤温度测量的土石坝渗漏监测技术 被引量:11
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作者 孙东亚 Markus Aufleger 《水利水电科技进展》 CSCD 2000年第4期29-31,共3页
采用具有高信息密度的分布式光纤温度传感测量系统进行土石坝渗漏监测技术研究 .经过理论研究和室内、现场试验 ,已取得了初步研究成果 .实践表明 ,该传感系统可以埋置于防渗体的下游排水或反滤层内 ,不会因机械施工而损伤 ,具有施工干... 采用具有高信息密度的分布式光纤温度传感测量系统进行土石坝渗漏监测技术研究 .经过理论研究和室内、现场试验 ,已取得了初步研究成果 .实践表明 ,该传感系统可以埋置于防渗体的下游排水或反滤层内 ,不会因机械施工而损伤 ,具有施工干扰小 ,抗电磁干扰等特点 ,系统测量精度能满足工程应用的要求 .该项测量技术还可用于混凝土坝的温度场测量 . 展开更多
关键词 渗漏 土石坝 监测 光纤温度传感测量系统
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小尺寸Si/Ge量子点内应变和组分的拉曼光谱表征 被引量:2
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作者 谭平恒 周霞 +3 位作者 杨富华 K.Brunner D.Bougeard G.Abstreiter 《光散射学报》 2004年第3期203-207,共5页
本文详细地研究了原始生长和退火处理后的Si/Ge量子点的拉曼光谱。我们观测到了Si/Ge量子点的一系列本征的拉曼振动模以及Ge-Ge模的LO和TO声子峰间4.2cm-1的频率劈裂。通过这些参数,我们自洽地确定了原始生长的平面直径为20nm和高为2nm... 本文详细地研究了原始生长和退火处理后的Si/Ge量子点的拉曼光谱。我们观测到了Si/Ge量子点的一系列本征的拉曼振动模以及Ge-Ge模的LO和TO声子峰间4.2cm-1的频率劈裂。通过这些参数,我们自洽地确定了原始生长的平面直径为20nm和高为2nm的Si/Ge量子点内Ge的平均组分为80%,平均应变为-3.4%。分析清楚地表明了这种小尺寸的Si/Ge量子点内的应变仍遵从双轴应变,并且应变的释放主要由量子点和Si隔离层间Si-Ge原子互扩散决定。 展开更多
关键词 量子点 拉曼光谱 应变 组分 Si—Ge原子互扩散
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HgGdTe子能带电子的磁光共振
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作者 褚君浩 沈学础 +1 位作者 R.Sizmann F.Koch 《红外与毫米波学报》 SCIE EI CAS CSCD 北大核心 1991年第1期44-50,共7页
报道P-Hg_(1-x)Cd_xTe(x=0.234、N_A=4×10^(17)cm^(-3))MIS结构样品在电量子限条件下电子子能带朗道能级间磁光共振光跃迁实验结果。测量了不同光子能量和样品在不同表面电子浓度时子能带朗道能级间和自旋能级间的回旋共振和自旋... 报道P-Hg_(1-x)Cd_xTe(x=0.234、N_A=4×10^(17)cm^(-3))MIS结构样品在电量子限条件下电子子能带朗道能级间磁光共振光跃迁实验结果。测量了不同光子能量和样品在不同表面电子浓度时子能带朗道能级间和自旋能级间的回旋共振和自旋共振。定量地证明了窄禁带半导体量子阱子能带朗道能级的移动和交叉效应,这一效应起源于表面势的反演不对称所导致的较强的表面电子自旋轨道相互作用。 展开更多
关键词 碲镉汞 子能带 电子 磁光效应
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HgCdTe共振缺陷态的电容谱研究
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作者 褚君浩 R.Sizmann +3 位作者 R.Wollrab F.Koch J.Ziegler H.Maier 《红外研究》 CSCD 北大核心 1989年第5期327-334,共8页
提出一种测量HgCdTe量子电容谱、研究共振缺陷态的方法.利用高精度差分电容测量方法,在4.2K下测量了一系列受主浓度为3×10^(16)~4×10^(17)cm^(-3)的P型HgCdTe MIS样品的C-V曲线.对浓度约10^(17)cm^(-3)的强P型Hg_0.79Cd_0.2... 提出一种测量HgCdTe量子电容谱、研究共振缺陷态的方法.利用高精度差分电容测量方法,在4.2K下测量了一系列受主浓度为3×10^(16)~4×10^(17)cm^(-3)的P型HgCdTe MIS样品的C-V曲线.对浓度约10^(17)cm^(-3)的强P型Hg_0.79Cd_0.21Te体材料样品,在C-V曲线上耗尽区和反型层交界的偏压区域观察到一个附加峰,该峰起源于导带底以上45meV的一个共振缺陷态,分析表明是氧占据Hg空位的杂质缺陷态. 展开更多
关键词 碲镉汞 共振缺陷态 电容谱 半导体
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