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Advanced Powder Materials 2023年第2期2卷 104-112页

作者： nan Kang Yuan zhang Mohamed El Mansori Xin lin Arts et Metiers Institute of Technology MSMPHESAM UniversiteF-51006Cha^lons-en-ChampagneFrance State Key Laboratory of Solidiﬁcation Processing Northwestern Polytechnical UniversityXi'an710072China Key Laboratory of Metal High Performance Additive Manufacturing and Innovative Design MIIT ChinaNorthwestern Polytechnical UniversityXi'an710072China Texas A&M Engineering Experiment Station Institute for Manufacturing SystemsCollege Station77843USA

Quasicrystal(QC)-reinforced metal matrix composites fabricated by rapid solidiﬁcation present promising new opportunities to develop high-strength alloys with multiple *** this research,specially designed Al–Fe–Cr samples possessing an Al–Fe–Cr quasicrystal-reinforced Al matrix structure were manufactured using a laser powder bed fusion(LPBF)*** on the optimized process parameters of laser scanning speed and hatch distance,an almost dense(99.8%)free-crack sample was obtained with the multiscaled heterogenous structure induced by the nonuniform rapid solidiﬁcation in a single molten *** results show that nanosized Al–Fe–Cr quasicrystalline particles of different sizes are heterogeneously distributed in theα-Al columnar grain *** detail,the coarseﬂower-like and spherical QC particles can be observed at the molten pool boundary,and theﬁne spherical Al–Fe–Cr QC is located inside the laser fusion *** orientation relationship between the Al matrix and the icosahedral Al–Fe–Cr QC is as follows:Al[112]||i5 with a semicoherency *** novel designed LPBF-processed Al–Fe–Cr alloy exhibits high mechanical strength due to the ultraﬁne multireinforced microstructure-induced Orowan strengthening *** instance,the ultimate tensile strength,yield strength and elongation of the sample processed with LPBF are 530.803.19 MPa,395.066.44 MPa,and 4.16%0.38%,*** fractographic analysis shows that the fracture mechanism presents a combination of ductile‒brittle fracture.

关键词： Laser powder bed fusion Metal matrix composite Quasicrystal Heterogenous microstructure Tensile properties

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深度学习驱动下的目标检测研究进展综述

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计算机工程与应用 2025年第1期61卷 24-41页

作者：山显英张琳李泽慧北京建筑大学电气与信息工程学院北京102616

近年来,深度学习在GPU高性能计算能力的加持下得到了迅速推广,并在安防、医疗、工业等领域实现了广泛应用。目标检测模型的性能也在稳步提高,从传统的目标检测方法逐渐过渡到基于卷积神经网络(CNN)深度学习的进一步应用,极大地节省了人... 详细信息

近年来,深度学习在GPU高性能计算能力的加持下得到了迅速推广,并在安防、医疗、工业等领域实现了广泛应用。目标检测模型的性能也在稳步提高,从传统的目标检测方法逐渐过渡到基于卷积神经网络(CNN)深度学习的进一步应用,极大地节省了人力物力。通过参考大量文献,按照两阶段脉络梳理了目标检测的发展历程以及近年深度学习在目标检测领域内的研究进展,对比了在不同数据集上模型网络的性能,总结不同方法的优势与不足,并对领域内重要数据集作了归纳,还对目标检测算法的落地效果做了总结,特别是生活与科技中的实际应用(无人驾驶、医学图像、遥感等)。最后,还对深度学习驱动下目标检测在未来研究上的机遇和挑战作了展望。

关键词：目标检测卷积神经网络单阶段两阶段目标检测应用

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High Eckardt score and previous treatment were associated with poor postperoral endoscopic myotomy pain control:A retrospective study

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World Journal of Clinical Cases 2022年第17期10卷 5655-5666页

作者： Wan-nan Chen Yao-lin Xu Xiao-Guang zhang Department of Anesthesia Zhongshan HospitalFudan UniversityShanghai 200032China Department of General Surgery Zhongshan Hospital Fudan UniversityShanghai 200032China

BACKGROUND Peroral endoscopic myotomy(POEM)is a safe and effective endoscopic treatment for ***,postoperative pain management for these patients is often neglected by anesthesiologists because of the short operative time,short hospital stay and the minimally invasive nature of the *** To assess the pain and sleep quality of achalasia patients receiving the POEM procedure and investigate factors that affect postoperative *** This observational study included patients with achalasia who underwent POEM at Zhongshan Hospital from December 2017 to March *** anesthesia was performed with endotracheal *** postoperative visual analog scale(VAS),postoperative sleep quality,basic patient information,and surgical parameters were *** on whether the 12-h post-POEM VAS score was less than 4,patients were divided into two groups,a well-controlled pain group and a poorly controlled pain ***,multivariate,and stepwise logistic regression analyses were used to investigate risk factors for poor pain control.A prediction model of post-POEM pain risk was established in the form of a *** calibration curve and receiver operating characteristic curve were used to evaluate the clinical usage of the prediction *** measures analysis of variance and simple effect analysis were used to verify whether differences in the VAS and sleep scores of the high-and low-risk groups,divided by the model from the raw data,were statistically *** A total of 45 eligible patients were *** logistic regression and further stepwise logistic regression analysis found that the preoperative Eckardt score[odds ratio(OR):1.82,95% confidence interval(CI):1.17-2.84,P<0.001],previous treatment(OR:7.59,95%CI:1.12-51.23,P=0.037)and the distance between the end of the muscle incision and the cardia(OR:1.52,95%CI:0.79-293.93,P=0.072)were risk factors for post-POEM *** measures analys

关键词： Achalasia Peroral endoscopic myotomy Anesthesia Postoperative pain Sleep quality Nomogram

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Graph deep learning accelerated efficient crystal structure search and feature extraction

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npj Computational Materials 2023年第1期9卷 524-532页

作者： Chuan-nan Li Han-Pu Liang Xie zhang Zijing lin Su-Huai Wei Department of Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Beijing Computational Science Research Center Beijing 100193China School of Materials Science and Engineering Northwestern Polytechnical UniversityXi’an 710072China

Structural search and feature extraction are a central subject in modern materials design,the efficiency of which is currently limited,but can be potentially boosted by machine learning(ML).Here,we develop an ML-based prediction-analysis framework,which includes a symmetry-based combinatorial crystal optimization program(SCCOP)and a feature additive attribution model,to significantly reduce computational costs and to extract property-related structural *** method is highly accurate and predictive,and extracts structural features from desired structures to guide materials *** first test SCCOP on 35 typical compounds to demonstrate its *** a case study,we apply our approach to a two-dimensional B-C-N system,which identifies 28 previously undiscovered stable structures out of 82 compositions;our analysis further establishes the structural features that contribute most to energy and *** to conventional approaches,SCCOP is about 10 times faster while maintaining a comparable *** framework is generally applicable to all types of systems for precise and efficient structural search,providing insights into the relationship between ML-extracted structural features and physical properties.

关键词： structural crystal precise

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Microstructural Evolution and Performance of In-situ Ag-Ni Composite after Solidification under Electromagnetic Stirring and Deformation

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Journal of Iron and Steel Research International 2016年第7期23卷 638-646页

作者： lin zhang Ke HAN Tian-nan MAN En-gang WANG Xiao-wei ZUO Key Laboratory of Electromagnetic Processing of Materials(Ministry of Education) Northeastern University National High Magnetic Field Laboratory Florida State University

The effect of electromagnetic stirring（EMS）on microstructure and performance of Ag-8 mass%Ni composite was investigated under both solidified and deformed *** EMS,the Ag matrix formed short,thick dendrites in the ingot;whereas with EMS,dendrites were long and *** phase mainly formed particles or ribbons,distributed along boundaries between dendrite *** drawing of the solidified Ag-Ni ingots,both with and without EMS,produced high strength in-situ metal-matrix composite（MMC）consisting of Ag matrix reinforced by Ni *** improved the ductility of the composite,consequently enhancing its drawability and *** also increased the electrical conductivity in both solidified ingots and deformed in-situ composite *** both cases,hardness and tensile strength remained high.A model based on a combination of the modified linear rule of mixtures and the Hall-Petch relationship was used to rationalize the tensile strength and hardness with respect to its fabrication parameters and the microstructure of Ag-Ni in-situ composite.

关键词： Ag-Ni electromagnetic stirring solidification in-situ metal matrix composite

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Metastable seed-crystals: epitaxial growth of branched-array organic heterostructure nanowires

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Science China Chemistry 2025年

作者： Jin Feng Zhen-Yu Geng Ting-Yao Song Ying-Xin Ma Chuan-Zeng Wang Wei zhang Hong-Tao lin Jin Zhou Shu-Ping Zhuo Shu-Hai Chen Xue-Dong Wang School of Chemistry and Chemical Engineering Shandong University of Technology Institute of Functional nano & Soft Materials (FUNSOM) Jiangsu Key Laboratory for Carbon-Based Functional Materials & DevicesSoochow University College of Chemistry and Chemical Engineering Hunan Normal University

Tunable light–matter interactions are exhibited by organic low-dimensional crystals, making these crystals a promising platform for organic photonics. However, the precise synthesis of organic low-dimensional crystals remains challenging due to the stochastic nature of molecular nucleation processes. Herein, the directed nucleation process is driven by the introduction of metastable seed-crystals as the trunk, which ultimately leads to branched-array organic heterostructures. The successful formation of organic heterostructures with high-density branched arrays is attributed to the highest attachment energy (Eatt（023）=-104.25 kcal mol-1) of the exposed （023） crystal plane during the seed-crystal growth route. Significantly, these as-prepared heterostructures inherently have an ultralow lattice mismatch ratio η of 0.7%between trunk and branch, which contributes to the multi-channel photon transportation. Therefore, this work provides valuable insights into a versatile synthetic strategy for accessing low-dimensional heterostructures for integrated optoelectronics.

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Boosting charge extraction and efficiency of inverted perovskite solar cells through coordinating group modification at the buffer layer/cathode interface

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nano Research 2025年第1期18卷 415-423页

作者： Zhiqing Liang Ziqiu Ren Ziyu Wang nan Yan ling Li Bo zhang Yanlin Song College of Chemistry Zhengzhou UniversityZhengzhou 450052China Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy DevicesShaanxi Engineering Lab for Advanced Energy Technology School of Materials Science and EngineeringShaanxi Normal UniversityXi’an 710119China Key Laboratory of Green Printing Institute of ChemistryChinese Academy of Sciences(ICCAS)Beijing Engineering Research Center of Nanomaterials for Green Printing TechnologyNational Laboratory for Molecular Sciences(BNLMS)Beijing 100190China

In inverted perovskite solar cells (PSCs),effective modification of the interface between the metalcathode and electron transport layer (ETL) is crucial forachieving high performance and stability. Herein, sulfonatedbathocuproine, commonly known as disodium bathocuproinedisulfonate (BCDS), was employed as a cathode buffer layerto address the interfacial issues at the [6,6]-phenyl-C61-butyricacid methyl ester (PCBM)/Ag interface. BCDS possesses theability to form coordinate bonds with Ag electrodes. Theutilization of the BCDS buffer layer enhanced the chargeextraction capability at the cathode interface whilesimultaneously achieving interfacial defect passivation,improving interfacial contact and increasing the built-in electricfield. Consequently, a power conversion efficiency (PCE) of25.06% was achieved. Furthermore, owing to the excellent filmforminguniformity of BCDS on PCBM, the stability of thedevice was also improved. After storage in dry air for morethan 2000 h, the device maintained 96% of its initial efficiency. This work underscores the remarkable potential of tailoringcoordination groups to enhance charge extraction efficiency at the ETL-cathode interface, unveiling a promising newfrontier in buffer layer development and performance optimization strategies for PSCs.

关键词： perovskite solar cells buffer layer bathocuproine disulfonate coordination group modification electron transport layer(ETL)-cathode interface

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语言文字视角下“五谷”的文化内涵

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语文教学之友 2025年第1期44卷 6-8页

作者：张亚南廊坊师范学院文学院

“五谷”代表中国古代农业文明的丰富成果,也蕴含深厚的人文精神。通过对文献中“五谷”含义的系统梳理,认为解释为黍、稷、麦、菽、稻最合理。语文教学中加深学生对“五谷”文化内涵的认识,有助于学生更好地理解古诗文,增进对中国传统... 详细信息

“五谷”代表中国古代农业文明的丰富成果,也蕴含深厚的人文精神。通过对文献中“五谷”含义的系统梳理,认为解释为黍、稷、麦、菽、稻最合理。语文教学中加深学生对“五谷”文化内涵的认识,有助于学生更好地理解古诗文,增进对中国传统文化的认同,培养民族自豪感和文化自信。

关键词：五谷黍稷麦稻菽

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Maternal Murine Cytomegalovirus Infection during Pregnancy Up-regulates the Gene Expression of Toll-like Receptor 2 and 4 in Placenta

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Current Medical Science 2018年第4期38卷 632-639页

作者： Yi LIAO Ya-nan zhang Xing-lou LIU Yuan-yuan LU lin-lin zhang Ting XI Sai-nan SHU Feng FANG Department of Pediatrics Tongji Hospital Tongji Medical College Huazhong University of Science and TechnologyWuhan 430032 China

Increasing evidence has revealed that maternal cytomegalovirus （CMV） infection may be associated with neurodevelopmental disorders in offspring. Potential relevance between the placental inflammation and CMV-related autism has been reported by clinical observation. Meanwhile, abnormal expression of Toll-like receptor 2 （TLR2） and TLR4 in placenta of patients with chorioamnionitis was observed in multiple studies. IL-6 and IL- 10 are two important maternal inflammatory mediators involved in neurodevelopmental disorders. To investigate whether murine CMV （MCMV） infection causes alterations in placental IL-6/10 and TLR2/4 levels, we analyzed the dynamic changes in gene expression of TLR2/4 and IL-6/10 in placentas following acute MCMV infection. Mouse model of acute MCMV infection during pregnancy was created, and pre-pregnant MCMV infected, lipopolysaccharide （LPS）-treated and uninfected mice were used as controls. At E13.5, E 14.5 and E 18.5, placentas and fetal brains were harvested and mRNA expression levels of placental TLR2/4 and IL-6/10 were analyzed. The results showed that after acute MCMV infection, the expression levels of placental TLR2/4 and IL-6 were elevated at E13.5, accompanied by obvious placental inflammation and reduction of placenta and fetal brain weights. However, LPS 50 ktg/kg could decrease the IL-6 expression at E13.5 and E14.5. This suggests that acute MCMV infection during pregnancy could up-regulate the gene expression of TLR2/4 in placental trophoblasts and activate them to produce more pro- inflammatory cytokine IL-6. High dose of LPS stimulation （50 gg/kg） during pregnancy can lead to down-regulation of IL-6 levels in the late stage. Imbalance of IL-6 expression in placenta might be associated with the neurodevelopmental disorders in progeny.

关键词： murine cytomegalovirus maternal immune activation placenta TLR2 TLR4 IL-6

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A FRAMEWORK FOR REAL-VALUED CIPHER SYSTEMS

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Journal of Systems Science & Complexity 2007年第4期20卷 486-491页

作者： Zhaozhi zhang nan JIANG Institute of Systems Science Academy of Mathematics and Systems Science Chinese Academy of Sciences Beijing 100080 China College of Computer Science and Technology Beijing University of Technology Beijing 100022 China

Most cipher systems designed thus far are binary-valued or integer-valued cipher systems. Their security relies on the assumption that one-way functions exist. Though the existence of one-way functions has not been proved yet, most cryptographic researchers believe that one-way functions exist. In addition, many candidates for one-way functions have been proposed. Therefore, the key step for developing real-valued cipher systems is to define real one-way functions and to propose candidates for them. In this paper, based on computational complexity theory over the real field, we give two definitions of real one-way functions; one is for digital one-way functions and the other is for general one-way functions. Candidates for these two classes of one-way functions are also proposed. Moreover, we present two examples to demonstrate that the candidates for both digital one-way functions and general one-way functions can be applied to construct secure real-valued cipher systems.

关键词： Computational complexity theory digital one-way function general one-way function real-valued cipher system.

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