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Measurement of the high energyγ-rays from heavy ion reactions usingČerenkov detector

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Nuclear Science and Techniques 2024年第2期35卷 123-130页

作者： Da-Wei Si Yan Zhou Sheng Xiao Zhi Qin Dong Guo Yu-Hao Qin yi-jie wang Bo-Yuan Zhang Bai-Ting Tian Zhi-Gang Xiao Department of Physics Tsinghua UniversityBeijing 100084China

The energetic bremsstrahlung photons up to 100 MeV produced in heavy ion collisions can be used as a sensitive probe for short-range correlation in atomic nuclei. The energy of the γ-rays can be measured by collecting the Čerenkov light in the medium induced by the fast electrons generated in the Compton scattering or electromagnetic shower of the incident γray. Two types of detectors based on pure water and lead glass as sensitive materials were designed for this purpose. The γresponse and optical photon propagation in the detectors were simulated based on electromagnetic and optical processes in Geant4. The inherent energy resolutions of 0.022(4) + 0.51(2)∕E^(1/2)_(γ) for water and 0.0026(3) + 0.446(3)∕E^(1/2)_(γ) for lead glass were obtained. The geometry sizes of the lead glass and water were optimized to 30 cm × 30 cm × 30 cm and 60 cm × 60 cm ×120 cm, respectively, to detect high-energy γ-rays at 160 MeV. The Hough transform method was applied to reconstruct the direction of the incident γ-rays, providing the ability to experimentally distinguish the high-energy γ-rays produced in the reactions on the target from random background cosmic-ray muons.

关键词： Bremsstrahlungγ-rays Čerenkov Geant4 Energy resolution Direction reconstruction Hough transform

CO_(2)捕集及电催化还原制甲酸研究进展

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科学通报 2024年第27期69卷 4103-4118页

作者：王艺洁韩芳珍赵莉莉鲁仰辉马猛王凯高文强周伟家济南大学化学化工学院前沿交叉科学研究院济南250022 国家电投集团科学技术研究院有限公司北京102209 山东电工电气集团有限公司电力工程分公司济南250022

CO_(2)捕集与CO_(2)电催化还原技术是减少碳排放、提高碳的可再生循环利用率的重要途径.两种技术既独立存在,又可以作为碳循环周期中的上下环节相互结合,即先捕集并提纯混合气中的CO_(2),然后将收集到的高纯度CO_(2)进行电催化还原反应... 详细信息

CO_(2)捕集与CO_(2)电催化还原技术是减少碳排放、提高碳的可再生循环利用率的重要途径.两种技术既独立存在,又可以作为碳循环周期中的上下环节相互结合,即先捕集并提纯混合气中的CO_(2),然后将收集到的高纯度CO_(2)进行电催化还原反应,将其进一步转化为更有用的化学品.本文首先总结了CO_(2)捕集技术的研究现状,然后考虑到甲酸作为目前经济和技术上最具潜力的还原产物,调研并汇总了近年来在CO_(2)电还原制甲酸领域中关于高效电催化剂的制备和反应器件设计方面取得的研究进展.针对两种技术的研究现状,最后提出加快和开发新型碳捕集与利用技术,开发低成本、高效、稳定的电催化剂和设计具有低欧姆电阻、高转化能效的反应器等可以作为未来的研究重点和发展方向.

关键词： CO_(2)捕集 CO_(2)电化学还原反应甲酸电催化剂

Dynamic transport characteristics of side-coupled double-quantum-impurity systems

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Chinese Physics B 2022年第9期31卷 493-501页

作者： yi-jie wang Jian-Hua Wei Department of Physics Renmin University of ChinaBeijing 100872China

A systematic study is performed on time-dependent dynamic transport characteristics of a side-coupled double-quantum-impurity system based on the hierarchical equations of *** is found that the transport current behaves like a single quantum dot when the coupling strength is low during tunneling or Coulomb *** the case of only tunneling transition,the dynamic current oscillates due to the temporal coherence of the electron tunneling *** oscillation frequency of the transport current is related to the step voltage applied by the lead,while temperature T,electron-electron interaction U and the bandwidth W have little *** amplitude of the current oscillation exists in positive correlation with W and negative correlation with *** the increase in coupling t_(12) between impurities,the ground state of the system changes from a Kondo singlet of one impurity to a spin singlet of two ***,lowering the temperature could promote the Kondo effect to intensify the oscillation of the dynamic *** only the Coulomb transition is coupled,it is found that the two split-off Hubbard peaks move upward and have different interference effects on the Kondo peak at the Fermi surface with the increase in U_(12),from the dynamics point of view.

关键词： quantum dots tunneling transition capacitive type

Relationship between intralobar pulmonary sequestration and type A aortic dissection:A case report

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World Journal of Clinical Cases 2023年第15期11卷 3658-3663页

作者： yi-jie wang ying-yi Chen Gang-Hua Lin Department of Surgery Tri Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of Thoracic Surgery Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of General Surgery Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan

BACKGROUND Pulmonary sequestrations often lead to serious complications such as infections,tuberculosis,fatal hemoptysis,cardiovascular problems,and even malignant degeneration,but it is rarely documented with medium and large vessel vasculitis,which is likely to result in acute aortic *** SUMMARY A 44-year-old man with a history of acute Stanford type A aortic dissection status post-reconstructive surgery five years *** contrast-enhanced computed tomography of the chest at that time had also revealed an intralobar pulmonary sequestration in the left lower lung region,and the angiography also presented perivascular changes with mild mural thickening and wall enhancement,which indicated mild *** intralobar pulmonary sequestration in the left lower lung region was long-term unprocessed,which was probably associated with his intermittent chest tightness since no specific medical findings were detected but only positive sputum culture with mycobacterium avium-intracellular complex and *** performed uniportal video-assisted thoracoscopic surgery with wedge resection of the left lower *** over the parietal pleura,engorgement of the bronchus due to a moderate amount of mucus,and firm adhesion of the lesion to the thoracic aorta were histopathologically *** We hypothesized that a long-term pulmonary sequestration-related bacterial or fungal infection can result in focal infectious aortitis gradually,which may threateningly aggravate the formation of aortic dissection.

关键词： Intralobar pulmonary sequestration Acute aortic dissection Medium and large vessel vasculitis Infection Case report

Mineral phase reconstruction behavior of direct reduction and smelting titanium slag at high temperature and slow cooling

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Rare Metals 2015年第6期34卷 440-444页

作者： yi-jie wang Shu-Ming Wen Qi-Cheng Feng Zhi-Wen Ye Min wang State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Kunming University of Science and Technology Faculty of Land Resource Engineering Kunming University of Science and Technology Advanced Analysis and Measurement Center Yunnan University

Titanium slag in this study was produced by subjecting titanomagnetite concentrate to direct reductionelectric furnace smelting. Processing mineralogy and mineral phase reconstruction behavior at high temperature and slow cooling treatment were examined by chemical analysis, X-ray diffraction （XRD）, optical microscopy （OM）, scanning electron microscopy （SEM）, and energydispersive spectroscopy （EDS）. Anosovite solid solution is the main titanium product by the direct reduction and smelting process. Results of slow-cooling experiments show that crystal volume and size increase as cooling rate decreases. Anosovite and gangue mineral crystals develop fully with large crystal volume and size at a cooling rate of 2 ***-1. Moreover, the growth of anosovite crystal was characterized by crystal nucleation and growth theory. These results provide further insights into the separation of anosovite from gangue by mineral processing.

关键词： Direct reduction Smelting titanium slag Anosovite Slow cooling Crystal

FAAD:an unsupervised fast and accurate anomaly detection method for a multi-dimensional sequence over data stream

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Frontiers of Information Technology & Electronic Engineering 2019年第3期20卷 388-404页

作者： Bin LI yi-jie wang Dong-sheng YANG Yong-mou LI Xing-kong MA Science and Technology on Parallel and Distributed Processing Laboratory College of ComputerNational University of Defense Technology Block Chain Research Institute of LianLian Pay

Recently, sequence anomaly detection has been widely used in many fields. Sequence data in these fields are usually multi-dimensional over the data stream. It is a challenge to design an anomaly detection method for a multi-dimensional sequence over the data stream to satisfy the requirements of accuracy and high speed. It is because:(1) Redundant dimensions in sequence data and large state space lead to a poor ability for sequence modeling;(2) Anomaly detection cannot adapt to the high-speed nature of the data stream, especially when concept drift occurs, and it will reduce the detection rate. On one hand, most existing methods of sequence anomaly detection focus on the single-dimension sequence. On the other hand, some studies concerning multi-dimensional sequence concentrate mainly on the static database rather than the data stream. To improve the performance of anomaly detection for a multi-dimensional sequence over the data stream, we propose a novel unsupervised fast and accurate anomaly detection(FAAD) method which includes three algorithms. First, a method called "information calculation and minimum spanning tree cluster" is adopted to reduce redundant dimensions. Second, to speed up model construction and ensure the detection rate for the sequence over the data stream, we propose a method called"random sampling and subsequence partitioning based on the index probabilistic suffix tree." Last, the method called "anomaly buffer based on model dynamic adjustment" dramatically reduces the effects of concept drift in the data stream. FAAD is implemented on the streaming platform Storm to detect multi-dimensional log audit *** with the existing anomaly detection methods, FAAD has a good performance in detection rate and speed without being affected by concept drift.

关键词： Data stream Multi-dimensional sequence Anomaly detection Concept drift Feature selection

Solar fuel production through concentrating light irradiation

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Green Energy & Environment 2024年第10期9卷 1550-1580页

作者： yiwei Fu yi wang jie Huang Kejian Lu Maochang Liu International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow Xi'an Jiaotong University Suzhou Academy of Xi'an Jiaotong University

The climate crisis necessitates the development of non-fossil energy sources. Harnessing solar energy for fuel production shows promise and offers the potential to utilize existing energy infrastructure. However, solar fuel production is in its early stages of development, constrained by low conversion efficiency and challenges in scaling up production. Concentrated solar energy(CSE) technology has matured alongside the rapid growth of solar thermal power plants. This review provides an overview of current CSE methods and solar fuel production, analyzes their integration compatibility, and delves into the theoretical mechanisms by which CSE impacts solar energy conversion efficiency and product selectivity in the context of photo-electrochemistry, thermochemistry, and photo-thermal co-catalysis for solar fuel production. The review also summarizes approaches to studying the photoelectric and photothermal effects of CSE. Lastly, it explores emerging novel CSE technology methods in the field of solar fuel production.

关键词： Concentrated solar energy Solar fuel Photo-electrochemistry Thermochemistry Photo-thermal co-catalysis

Invasive breast carcinoma with osteoclast-like stromal giant cells:A case report

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World Journal of Clinical Cases 2023年第7期11卷 1521-1527页

作者： yi-jie wang Chien-Peng Huang Zhi-jie Hong Guo-Shiou Liao Jyh-Cherng Yu Department of Surgery Tri Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Department of Pathology Tri Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of Traumatology Department of SurgeryTri-Service General HospitalNational Defense Medical CenterTaipei 114Taiwan Division of General Surgery Department of SurgeryTri Service General HospitalNational Defense Medical CenterTaipei 114Taiwan

BACKGROUND Invasive breast carcinoma with osteoclast-like stromal giant cells(OGCs) is an extremely rare morphology of breast *** the best of our knowledge,the most recent case report describing this rare pathology was published six years *** mechanism controlling the development of this unique histological formation is still ***,the prognosis of patients with OGC involvement is also *** SUMMARY We report the case of a 48-year-old woman,who presented to the outpatient department with a palpable,growing,painless mass in her left breast for about one *** and mammography revealed a 26.5 mm ×18.8 mm asymmetric,lobular mass with circumscribed margin and the Breast Imaging Reporting and Data System was category ***-guided aspiration biopsy revealed invasive ductal *** patient underwent breast conserving surgery and was diagnosed with invasive breast carcinoma with OGCs,grade Ⅱ,with intermediate grade of ductal carcinoma in situ(ER:80%,3+,PR:80%,3+,HER-2:negative,Ki 67:30%).Adjuvant chemotherapy and post-operation radiotherapy were initiated *** As a rare morphology of breast cancer,breast carcinoma with OGC occurs most often in relatively young women,has less lymph node involvement,and its occurrence is not racedependent.

关键词： Breast carcinoma Osteoclast stromal giant cell Pathology Histochemical stains Prognosis Case report

Hybrid Analytical and Data-Driven Model Based Instance-Transfer Method for Power System Online Transient Stability Assessment

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CSEE Journal of Power and Energy Systems 2024年第4期10卷 1664-1675页

作者： Feng Li Qi wang yi Tang Yan Xu jie Dang School of Electrical Engineering Southeast UniversityNanjing 210000China Center for Power Engineering(CPE) School of Electrical and Electronic EngineeringNanyang Technological UniversitySingapore 639798Singapore Central China Branch of State Grid Corporation of China Wuhan 430077China

Data-driven methods are widely recognized and generate conducive results for online transient stability ***,the tedious and time-consuming process of sample collection is often *** functioning of power systems involves repetitive sample collection due to the constant variations occurring in the operation mode,thereby highlighting the importance of collection *** a means to achieve high sample collection efficiency following the operation mode change,we propose a novel instance-transfer method based on compression and matching strategy,which facilitates the direct acquisition of useful previous samples,used for creating the new sample ***,we present a hybrid model to ensure rationality in the process of sample similarity comparison and selection,where features of analytical modeling with special significance are introduced into data-driven *** the same time,a data-driven method can also be integrated in the hybrid model to achieve rapid error correction of analytical models,enabling fast and accurate post-disturbance transient stability *** a paradigm,we consider a scheme for online critical clearing time estimation,where integrated extended equal area criterion and extreme learning machine are employed as analytical model part and data-driven error correction model part,*** results validate the credible efficacy of the proposed method.

关键词： Critical clearing time extreme learning machine instance-transfer method transient stability assessment