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Effect of forging on the microstructure and texture of a high Nb containing γ-TiAl alloy

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Journal of Central South University 2024年第6期31卷 1763-1773页

作者： TAO Hui LI Hui-zhong WANG Li ZHOU Rui CHE Yi-xuan chen yong-hui LIANG Xiao-peng School of Materials Science and Engineering Central South UniversityChangsha 410083China State Key Laboratory of Powder Metallurgy Central South UniversityChangsha 410083China Key Laboratory of Nonferrous Metal Materials Science and Engineering Central South UniversityChangsha 410083China Department of Materials Science and Engineering City University of Hong KongKowloon 999077Hong KongChina

The effect of forging on the microstructure and texture evolution of a high Nb containing Ti-45Al-7Nb-0.3W(at.%)alloy was investigated by X-ray diffractometer(XRD),scanning electron microscopy(SEM),and transmission electron microscopy(TEM).The results show that the as-cast alloy is mainly composed of α_(2)/γ lamellar colonies with a mean size of 70μm,but the hot-forged pancake displays a near duplex microstructure(DP).Kinking and bending of lamellar colonies,deformation twinning and dynamic recrystallization(DRX)occur during hot ***,dense dislocations in theβphase after forging suggest that the high-temperature β phase with a disordered structure is favorable for improving the hot-workability of the *** the common TiAl casting texture,the solidification process of the investigated as-cast alloy with high Nb content is completely via the β phase region,resulting in the formation of aγ fiber texture where theγ aligns parallel to the heat-flow *** comparison,the relatively strongand weaktexture components in the as-forged alloy are attributed to the deformation *** annealing,static recrystallization occurs at the twin boundary and intersections,which weakens the deformation texture.

关键词： high Nb containingγ-TiAl alloy forging microstructure texture βphase

Metagenomics analysis identifies oral Streptococcus as potential biomarkers for nasopharyngeal carcinoma

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Journal of Genetics and Genomics 2024年第3期51卷 363-366页

作者： Yanmin Liu chengtao Wang Lixiang Xie Shuling Du Li Ding Ying Cui Runzhi chen Jingxiang Zhang Wan Wang Xi Liu Yan Wang Shiyan chen Tian Tan Qiaochu Zhao Limei Yin Chunwei Li yong chen Tao Ding Department of Immunology and Microbiology Zhongshan School of MedicineSun Yat-sen UniversityGuangzhouGuangdong 510080China Key Laboratory of Tropical Disease Control(Sun Yat-sen University) Ministry of EducationGuangzhouGuangdong 510080China Department of Radiation Oncology The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080China Department of Infectious Diseases The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhaiGuangdong 519000China Department of Endocrinology&Metabolism The Fifth Affiliated HospitalSun Yat-sen UniversityZhuhaiGuangdong 519000China Department of Otolaryngology The First Affiliated HospitalSun Yat-sen UniversityGuangzhouGuangdong 510080China

Nasopharyngeal carcinoma(NPC)is a malignancy originating from the nasopharyngeal epithelial *** some studies have identified potential biomarkers for early diagnosis of NPC based on metabolomics data(chen et al.,2023;Zhou et al.,2023)and Epstein-Barr virus subtypes(Xu et al.,2019),their effectiveness and applicability need further investigation,particularly when consideringthe roles of oral microbiota.

关键词： al. nasopharyngeal diagnosis

Weak Merging Scenario of CLASH Cluster A209

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Research in Astronomy and Astrophysics 2024年第4期24卷 174-182页

作者： Wen-cheng Feng Heng Yu Hai-Hui Zhao Xiao-Lan Hou Shu-Mei Jia cheng-Kui Li Yu-Lin cheng Paolo Tozzi Ming Sun yong chen Department of Physics and Institute of Theoretical Physics Nanjing Normal UniversityNanjing 210023China Key Laboratory of Particle Astrophysics Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Department of Astronomy Beijing Normal UniversityBeijing 100875China Department of Astronomy Yunnan UniversityKunming 650091China INAF—Osservatorio Astrofisico di Arcetri Largo E.Fermi50122 FirenzeItaly Department of Astronomy University of VirginiaP.O.Box 400325CharlottesvilleVA 22904-4325USA

We study the structural and dynamical properties of A209 based on Chandra and XMM-Newton *** obtain detailed temperature,pressure,and entropy maps with the contour binning method,and find a hot region in the NW *** X-ray brightness residual map and corresponding temperature profiles reveal a possible shock front in the NW direction and a cold front feature in the SE *** with the galaxy luminosity density map we propose a weak merger scenario.A young sub-cluster passing from the SE to NW direction could explain the optical subpeak,the intracluster medium temperature map,the X-ray surface brightness excess,and the X-ray peak offset together.

关键词： X rays:galaxies:clusters galaxies:clusters:intracluster medium galaxies:clusters:Abell 209

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“重返制海”与美国印太海上战略的拓展

外交评论（外交学院学报） 2024年第3期41卷 26-53,I0002,I0003页

作者：陈永上海社会科学院国际问题研究所上海200020

制海权是美国海上霸权的核心,当前印太新兴国家海上能力的提升引起了美国新的制海权焦虑。为了维护海上优势,美国开始聚焦印太地区,推进“由海向陆”到“重返制海”的海上战略转型。随着安全战略的基调由竞争转向威慑,在“一体化威慑”... 详细信息

制海权是美国海上霸权的核心,当前印太新兴国家海上能力的提升引起了美国新的制海权焦虑。为了维护海上优势,美国开始聚焦印太地区,推进“由海向陆”到“重返制海”的海上战略转型。随着安全战略的基调由竞争转向威慑,在“一体化威慑”大战略的指导下,美国不断协调国家战略、军事战略及技战术层级“重返制海”战略的概念、目标和资源,并以中国为主要假想敌,拓展印太海上战略。美国以护持印太制海权为主要目标的印太海上战略概念不断创新,通过加强西太平洋前沿力量存在、巩固非对称和传统军事力量优势、进行盟伴动员等方式,转移、汲取和转化美国的资源及能力,以促进“重返制海”战略目标的实现。美国以威慑或准备击败对手的姿态,拓展和推进印太“重返制海”战略,加剧了印太海上安全竞争,激化了中美战略竞争,也塑造了印太海上乃至整个地区的规则与秩序。未来美国将采取提高汲取及转化自身资源的效率、加大动员盟伴资源的力度和改变护持制海权的目标及手段等方式,持续调整印太海上战略,但其护持印太制海权的前景尚不明朗。

关键词：重返制海制海权一体化威慑美国印太海上战略中美战略竞争

Endovascular treatment of ruptured lobulated anterior communicating artery aneurysms:A retrospective study of 24 patients

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World Journal of Clinical Cases 2024年第15期12卷 2529-2541页

作者： Sheng-Xuan Huang Xun-Ping Ai Ze-Hui Kang Zhi-yong chen Ren-Man Li Zu-Chao Wu Feng Zhu Department of Neurosurgery Sanming First Hospital Affiliated to Fujian Medical UniversitySanming 365000Fujian ProvinceChina

BACKGROUND Lobulated intracranial aneurysm is a special type of aneurysm with at least one additional cyst in the neck or body of the *** intracranial aneurysm is a complex aneurysm with complex morphology and structure and weak tumor wall,which is an independent risk factor for rupture and *** aneurysms located in the anterior communicating artery complex account for 36.9%of all intracranial lobular *** to its special anatomical structure,both craniotomy and endovascular treatment are more *** with single-capsule aneurysms,craniotomy for lobular intracranial aneurysms has a higher risk and complication *** To investigate the efficacy and safety of endovascular treatment for ruptured lobulated anterior communicating artery aneurysm(ACoAA).METHODS Patients with ruptured lobulated ACoAA received endovascular treatment in Sanming First Hospital Affiliated to Fujian Medical University from June 2020 to June 2022 were retrospectively *** demographic,clinical and imaging characteristics,endovascular treatment methods and follow-up results were *** A total of 24 patients with ruptured lobulated ACoAA were included,including 9 males(37.5%)and 15 females(62.5%).Their age was 56.2±8.9 years old(range 39-74).The time from rupture to endovascular treatment was 10.9±12.5 *** maximum diameter of the aneurysms was 5.1±1.0 mm and neck width were 3.0±0.7 *** patients(79.2%)were double-lobed and 5(20.8%)were ***'s grade:Grade 2 in 16 cases(66.7%),grade 3 in 6 cases(25%),and grade 4 in 2 cases(8.3%).Hunt-Hess grade:Grade 0-2 in 5 cases(20.8%),grade 3-5 in 19 cases(79.2%).Glasgow Coma Scale score:9-12 in 14 cases(58.3%),13-15 in 10 cases(41.7%).Immediately postprocedural Raymond-Roy grade:grade 1 in 23 cases(95.8%),grade 2 in 1 case(4.2%).Raymond-Roy grade in imaging follow-up for 2 wk to 3 months:grade 1 in 23 cases(95.8%),grade 2 in 1 case(4.2%).Followup for 2 to 12 months sho

关键词： Intracranial aneurysm Anterior cerebral artery Endovascular surgery Embolism Treatment outcome

Castleman Disease with Retroperitoneal Invasion of Iliac Vascular Zone: A Case Report of Unicentric Type & Review of the Literature

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Journal of Biosciences and Medicines 2024年第7期12卷 132-140页

作者： Sufei Wang Ning Hu yong chen Cunjian Yi Department of Obstetrics and Gynecology The First Affiliated Hospital of Yangtze University Jingzhou China

Castleman Disease is a rare nonneoplastic lymphoproliferative disorder that can be found in any lymph node station with unknown etiology. The current cumulative number of reported cases is minimal. We report a case of a 44-year-old woman with a hard mass in the pelvic retroperitoneal that has been gradually increasing in size for many years. Abdominopelvic MRI scan showed a left retroperitoneal mass and visible calcifications. The patient underwent resection of the left retroperitoneal mass and the pathological diagnosis was Castleman disease of hyaline vascular type.

关键词： Castleman’s Disease Unicentric Surgery

Correction of microwave pulse reflection by digital filters in superconducting quantum circuits

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CHINESE PHYSICS B 2024年第9期33卷 117-123页

作者： Guo, Liang-Liang Duan, Peng Du, Lei Zhang, Hai-Feng Tao, Hao-Ran chen, yong Yang, Xiao-Yan Zhang, Chi Jia, Zhi-Long Kong, Wei-cheng chen, Zhao-Yun Guo, Guo-Ping Univ Sci & Technol China CAS Key Lab Quantum Informat Hefei 230026 Peoples R China Univ Sci & Technol China CAS Ctr Excellence & Synerget Innovat Ctr Quantum Hefei 230026 Peoples R China Origin Quantum Comp Co Ltd Hefei 230088 Peoples R China Inst Artificial Intelligence Hefei Comprehens Natl Sci Ctr Hefei 230088 Peoples R China

Reducing the control error is vital for high-fidelity digital and analog quantum operations. In superconducting circuits, one disagreeable error arises from the reflection of microwave signals due to impedance mismatch in the control chain. Here, we demonstrate a reflection cancelation method when considering that there are two reflection nodes on the control line. We propose to generate the pre-distortion pulse by passing the envelopes of the microwave signal through digital filters, which enables real-time reflection correction when integrated into the field-programmable gate array (FPGA). We achieve a reduction of single-qubit gate infidelity from 0.67% to 0.11% after eliminating microwave reflection. Real-time correction of microwave reflection paves the way for precise control and manipulation of the qubit state and would ultimately enhance the performance of algorithms and simulations executed on quantum processors.

关键词： reflection cancelation digital filter single-qubit gate superconducting circuit ERROR GATE

Achieving high carrier mobility and low lattice thermal conductivity in GeTe-based alloys by cationic/anionic co-doping

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Rare Metals 2024年第6期43卷 2784-2795页

作者： Xiao-Qiang Wang Xiao-Quan Hu Jun-Yan Lin Chu-Bin Li Xiao-Tong Yu Qi-yong chen Li-Li Xi Qi-Shuo Yang Han Li Ji-Ye Zhang Shuan-Kui Li Kai Guo School of Physics and Materials Science Guangzhou UniversityGuangzhou 510006China Research Center for Advanced Information Materials(CAIM) Huangpu Research&Graduate School of Guangzhou UniversitySino-Singapore Guangzhou Knowledge CityGuangzhou510555China School of Materials Science and Engineering Shanghai UniversityShanghai 200444China Materials Genome Institute Shanghai UniversityShanghai 200444China School of Mechanical and Mining Engineering University of QueenslandBrisbaneQLD 4072Australia Key Laboratory of Si-Based Information Materials&Devices and Integrated Circuits Design Department of Education of Guangdong ProvinceGuangzhou 510006China

TheⅣ-Ⅵcompound GeTe is considered as a promising alternative to the toxic PbTe for high-efficiency mid-temperature thermoelectric ***,pristine GeTe suffers from a high concentration of Ge vacancies,resulting in an excessively high hole concentration(>1×10^(21)cm^(-3)),which greatly limits its thermoelectric *** address this issue,CuBiTe_(2)alloying is introduced to increase the formation energy of Ge vacancies in GeTe,thereby inhibiting the high carrier *** carrier scattering caused by the electronegativity difference between different elements is suppressed due to the similar electronegativity of Cu and Ge atoms.A relatively high hole mobility is obtained,which ultimately leads to a high power ***,by introducing Se as an alloying element at the anionic site in GeTe,dense point defects with mass/strainfield fluctuations are *** contributes to the strengthening of phonon scattering,thereby reducing the lattice thermal conductivity from 1.44 W·m^(-1)·K^(-1)for pristine GeTe to 0.28 W·m^(-1)·K^(-1)for Ge_(0.95)Cu_(0.05)Bi_(0.05)Te_(0.9)Se_(0.15)compound at 623 K.

关键词： GeTe Carrier mobility CuBiTe_(2)alloying Lattice thermal conductivity Thermoelectric properties

Janus-Helmholtz换能器的振动模态谐振频率理论分析研究

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物理学报 2024年第3期73卷 143-152页

作者：张羿双桑永杰陈永耀吴帅哈尔滨工程大学水声技术全国重点实验室哈尔滨150001 海洋信息获取与安全工业和信息化部重点实验室(哈尔滨工程大学) 哈尔滨150001 哈尔滨工程大学水声工程学院哈尔滨150001 青岛哈尔滨工程大学创新发展中心青岛266000

Janus-Helmholtz换能器利用驱动振子纵向谐振与Helmholtz谐振腔的液腔谐振耦合,具有大功率、宽带声发射特性.传统观点认为导纳曲线中低频谐振峰对应液腔谐振频率,而高频谐振峰对应纵振动谐振频率,然而大量的实验研究发现该结论存疑.本... 详细信息

Janus-Helmholtz换能器利用驱动振子纵向谐振与Helmholtz谐振腔的液腔谐振耦合,具有大功率、宽带声发射特性.传统观点认为导纳曲线中低频谐振峰对应液腔谐振频率,而高频谐振峰对应纵振动谐振频率,然而大量的实验研究发现该结论存疑.本文结合一只Janus-Helmholtz换能器实验样机的实验结果,运用等效电路法结合有限元法分析并求解了驱动振子纵向模态的谐振频率,使用有限元法分析并求解了Helmholtz谐振腔的液腔谐振频率.研究结果表明,与传统观点相反,导纳曲线中第1个谐振峰为驱动振子的纵向谐振,第2个谐振峰为Helmholtz谐振腔的液腔谐振;Janus换能器4个大尺寸辐射面带来的可观辐射质量是造成纵向振动谐振频率在水中大幅度下降的原因;Janus-Helmholtz换能器中存在两个等体积的Helmholtz共振腔而非传统认为的仅存在一个共振腔.这些结论对于正确认识Janus-Helmholtz换能器的结构及性能特性起到了正本清源的作用,也为优化创新该换能器的结构、改善换能器的声发射特性提供了技术支撑.

关键词： Janus-Helmholtz换能器谐振频率等效电路法辐射质量

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