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Printing perovskite and graphene parallel structure-based optical-mechanical sensors for human-machine interaction

Science China Technological Sciences 2025年

作者： Sisi CHEN Jiemin ZHANG Nan CHENG Wenbo LI Jing LIU Hongfei XIE Jie ZHANG Yueying CHENG Xiaotong ZHAO Meng SU Yanlin SONG Key Laboratory of Green Printing CAS Research/Education Center for Excellence in Molecular Sciences Institute of ChemistryChinese Academy of Sciences (ICCAS) University of Chinese Academy of Sciences Weiyang college Tsinghua University Department of Cardiovascular Surgery First Medical Center PLA General Hospital AECC beijing Institute of Aeronautical Materials beijing Institute of Graphene Technology beijing engineering research Centre of Graphene Application School of Integrated Circuit & beijing National research Center for Information Science and Technology (BNRist) Tsinghua University

Surgical robots are designed to provide enhanced precision and dexterity compared to manual surgical procedures,which mainly rely on multimodal sensing technologies for the surgeon to seamlessly operate the robotic arms and *** with single-mode sensors, optical and mechanical bi-modal sensors provide improved precision, enhanced safety,and robustness of human-machine interaction systems. Here, the template-guided and pneumatic printing technologies are combined to construct perovskite and graphene parallel structures with both optical and mechanical sensing capabilities. The printed uniformly crystallized perovskite microstructure exhibits fast and sensitive photoelectric response characteristics,enabling shadow recognition functionality. The combination of graphene and elastic rubber endows the great printability to prepare parallel structures near the perovskite arrays for force sensing capabilities. Thus, the printed perovskite and graphene structures possess non-contact optical sensing capabilities to detect hand position by recognizing shadows between the hand and the sensor, as well as contact mechanical sensing capabilities to detect touch force applied by the hand. It provides a synergistic platform for real-time and multidimensional feedback to improve human-machine interaction.

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Encapsulating perovskite quantum dots into 3D coF for visible light-driven co2 reduction

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Science China Chemistry 2025年

作者： Xinxin Wang Yucheng Jin Xiya Yang Qingyu Luan Tianyu Wang Dongdong Qi Kang Wang Jianzhuang Jiang college of Chemistry and Materials Science Anhui Normal University beijing Advanced Innovation Center for Materials Genome engineering Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials Department of Chemistry and Chemical Engineering School of Chemistry and Biological EngineeringUniversity of Science and Technology Beijing

Lead halide perovskite quantum dots（LHP QDs） have been revealed to possess great potential in photocatalytic applications including co2reduction, which however suffer from poor stability. Herein, a high crystalline hydrazine-linked three-dimensional（3D） covalent organic framework, USTB-17, was fabricated from the reaction between 12-connected building block and 4-connected 3,5,7-tetrakis（4-aldophenyl）-adamantane. Post-modification with Ni2+affords the metallic framework USTB-17（Ni）followed by sequential deposition of the CH3NH2PbI3（MAPbI3） perovskite QDs into its pores, generating the USTB-17（Ni）@MAPbI3composite. Powder X-ray diffraction analysis together with theoretical simulations and transmission electron microscopy discloses the crystalline nature of USTB-17, USTB-17（Ni）, and USTB-17（Ni）@MAPbI3with an unprecedented noninterpenetrated hpt topology. The close contact of QDs inside the coF pores with the Ni catalytic site locating at the pore surface of coF allows a rapid transfer of the photogenerated electrons in QDs to the Ni catalytic sites, enhancing the photocatalytic activity for co2reduction. This endows USTB-17（Ni）@MAPbI3with efficient photocatalysis performance for photocatalytic co2reduction with co generation rate of 365 μmol g-1h-1and co selectivity up to 96% under visible-light irradiation, 7 times higher than that of USTB-17（Ni）. After four cycles of reactions, the photocatalytic co generation rate remains almost unchanged, demonstrating its excellent cycle stability.

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Application of homogenization techniques for inflow transport approximation on light water reactor analysis

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Nuclear Science and Techniques 2022年第1期33卷 67-80页

作者： Xiang Xiao Kan Wang Tong-Rui Yang Yi-Xue Chen Department of engineering Physics Tsinghua UniversityBeijing 100084China State Power Investment corporation research Institute Co.LtdBeijing 100029China

The transport cross-section based on inflow transport approximation can significantly improve the accuracy of light water reactor(LWR)analysis,especially for the treatment of the anisotropic scattering *** previous inflow transport approximation is based on the moderator cross-section and normalized fission source,which is approximated using transport *** the accuracy of reactivity is increased,the P0 flux moment has a large error in the Monte Carlo *** this study,an improved inflow transport approximation was introduced with homogenization techniques,applying the homogenized cross-section and accurate fission *** numerical results indicated that the improved inflow transport approximation can increase the P0 flux moment accuracy and maintain the reactivity calculation precision with the previous inflow transport approximation in typical LWR *** addition to this investigation,the improved inflow transport approximation is related to the temperature *** improved inflow transport approximation is flexible and accurate in the treatment of the anisotropic scattering effect,which can be directly used in the temperature-dependent nuclear data library.

关键词： Inflow transport approximation Anisotropic scattering effect Homogenization techniques Light water reactor

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AZD1775 synergizes with SLC7A11 inhibition to promote ferroptosis

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Science China Life Sciences 2025年第1期 204-218页

作者： Chen Xiong Hong Ling Yingdan Huang Hanzhi Dong Bangxiang Xie Qian Hao Xiang Zhou Fudan University Shanghai Cancer Center and Institutes of Biomedical Sciences Fudan University Department of Oncology Shanghai Medical CollegeFudan University Department of Breast Surgery Fudan University Shanghai Cancer CenterFudan University Department of Oncology First Affiliated Hospital of Nanchang University beijing Institute of Hepatology Beijing Youan HospitalCapital Medical University beijing engineering research Center for precision Medicine and Transformation of Hepatitis and Liver Cancer Key Laboratory of Breast Cancer in Shanghai Fudan University Shanghai Cancer CenterFudan University Shanghai Key Laboratory of Medical Epigenetics International Co-laboratory of Medical Epigenetics and Metabolism (Ministry of Science and Technology)Institutes of Biomedical SciencesFudan University

Tumor suppressor p53-mediated cell cycle arrest and DNA damage repair may exert cytoprotective effects against cancer therapies, including WEE1 inhibition. considering that p53 activation can also lead to multiple types of cell death, the role of this tumor suppressor in WEE1 inhibitor-based therapies remains disputed. In this study, we reported that nucleolar stress-mediated p53 activation enhanced the WEE1 inhibitor AZD1775-induced ferroptosis to suppress lung cancer growth. Our findings showed that AZD1775 promoted ferroptosis by blocking cystine uptake, an action similar to that of Erastin. Meanwhile, inhibition of WEE1 by the WEE1 inhibitors or si RNAs induced compensatory upregulation of SLC7A11, which conferred resistance to ferroptosis. Mechanistically, AZD1775 prevented the enrichment of H3K9me3, a histone marker of transcriptional repression, on the SLC7A11 promoter by repressing the expression of the histone methyltransferase SETDB1, thereby enhancing NRF2-mediated SLC7A11 transcription. This finding was also validated using the H3K9me3 inhibitor BRD4770. Remarkably, we found that the nucleolar stress-inducing agent Actinomycin D(Act. D) inhibited SLC7A11 expression by activating p53, thus augmenting AZD1775-induced ferroptosis. Moreover, the combination of AZD1775 and Act. D synergistically suppressed wild-type p53-harboring lung cancer cell growth both in vitro and in vivo. Altogether, our study demonstrates that AZD1775 promotes ferroptosis by targeting cystine uptake but also mediates the adaptive activation of SLC7A11 through the WEE1-SETDB1 cascade and NRF2-induced transcription, and inhibition of SLC7A11 by Act. D boosts the anti-tumor efficacy of AZD1775 by enhancing ferroptosis in cancers with wild-type p53.

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Puncture Phenomena and Mechanism Analysis of a RTV coated Cap and Pin Insulators in a Steep-front Impulse Voltage Test

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 832-839页

作者： Tao Deng Xidong Liang Zhiyi Su Jun Zhou Electrical engineering Department Tsinghua UniversityBeijing 100084Chinaand also with Department of High VoltageChina Electric Power Research Institute Co.LtdBeijing 100192China Department Tsinghua UniversityBeijing 100084China Department of High Voltage China Electric Power Research Institute Co.LtdBeijing 100192China

In recent years,more than 6 million room temperature vulcanized(RTV)silicone rubber coated cap and pin insulators with high mechanical ratings were used in ultra-high voltage transmission lines in China to improve pollution ***,the unexpected puncture phenomena of RTV coated insulators were exposed during steep-front impulse voltage tests;for instance,the steep-front impulse voltage test pass rate decreased to less than 50% for 550 kN glass insulators with RTV *** steep-front impulse voltage test is the most effective method used to check the insulation quality of cap and pin insulators・This unexpected phenomenon once caused serious concerns to power *** this paper,several possible factors that affect the puncture of insulators were ***,the extent of the decline in the breakdown of the 550 kN glass cap and pin insulators with and without RTV coatings were *** initial puncture location was then found,and the developmental process of the arc on the insulator surface in steep-front impulse voltage tests was observed with an ultra-high-speed intensified charge coupled device ***,a breakdown mechanism is *** puncture phenomena of a RTV coated insulator in a steep-front impulse voltage test is essentially an electrical breakdown of the internal insulation・The RTV coating induces the close adherence of the arc to the surface of the *** closeness changes the arc development path on the insulator surface and facilitates easy breakdown in the shed weak *** these factors result in a significant increase in the breakdown probability of RTV coated insulators in steepfront impulse voltage tests.

关键词： Cap and pin insulator puncture RTV coating steep-front impulse voltage test

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Permanent magnetic properties of Nd-Fe-B melt-spun ribbons with Y substitution

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Rare Metals 2020年第1期39卷 55-61页

作者： Cao-Huan Zhang Yang Luo Dun-Bo Yu Ning-Tao Quan Gui-Yong Wu Ya-Kun Dou Zhou Hu Zi-Long Wang National engineering research Center for Rare Earth Materials General Research Institute for Nonferrous MetalsBeijing100088China Grirem Advanced Materials co.ltd Beijing100088China

Phase constituents,microstructures and magnetic properties of melt-spun Nd12-xYxFe81B6 Nb ribbons were investigated *** influence of Y substitution for Nd on the phase stability,grain size and magnetic exchange coupling was *** is found that all the ribbons crystallize in the tetragonal 2:14:1 structure,i.e.,with single hard magnetic phase at the roll speed of25 m *** the increase in Y doping,Curie temperature(Tc)increases,while the coercivity decreases monoclinic ***,remanence magnetization(Br)and maximum energy product((BH)max)fluctuate and the maximum value is obtained at certain amount of *** optimum magnetic properties of intrinsic coercivity of intrinsic coercivity(Hcj)=908.2 kA·m-1 and(BH)max=118.52 kJ·m-3 are achieved when x=*** can be attributed to the strengthened exchange coupling between the neighboring nanograins in Nd-Y-Fe-B meltspun powder based on the Henkel ***,Y substitution also significantly improves the temperature stability of magnetic *** coercivity temperature coefficient ofβ=-0.157%·℃-1 and remanence temperature coefficient ofα=-0.32%·℃-1 are gained,which are greatly reduced compared with those of the undoped Nd-Fe-B compounds.

关键词： Rapid quenching (Nd,Y)-Fe-B alloy Exchange coupling Thermal stability

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Dynamic characteristics of the pipeline inspection gauge under girth weld excitation in submarine pipeline

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Petroleum Science 2022年第2期19卷 774-788页

作者： Hang Zhang Meng-Qi Gao Biao Tang Can Cui Xue-Feng Xu college of Mechanical and Storage and Transportation engineering China University of Petroleum-BeijingBeijing102249China CNPC offshore engineering co.ltd Beijing102200China

Pipeline inner inspection technology based on Pipeline Inspection Gauge(PIG),is the primary means for ensuring the safety of submarine *** dynamic characteristics of a PIG can change abruptly with the excitation of obstacles such as girth welds inside the pipeline,which would result in failure or inaccuracy of the inspection *** study establishes a dynamic model of the PIG sealing disc based on Kelvin spring damping in the circumferentially confined *** axial vibration differential equations of the PIG is examined in ***/ADAMS is used to conduct the dynamic simulation of the PIG at different motion velocities and center of mass positions while passing through the girth weld *** indicate that the axial vibration caused by the girth weld intensifies substantially as the speed of the PIG increases,while the pitch and vertical vibrations exhibit a significant decline with an increase in the motion *** change in the PIG’s center of mass positions has little effect on its axial vibration,while the pitch and vertical vibration conditions are significantly different in the same circumstances.

关键词： Pipeline inspection gauge Multi-system model Dynamic response Shock vibration Girth weld Submarine pipeline

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Second harmonic 423-nm laser generated by BIBO crystal for calcium optical frequency standard

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Chinese Optics Letters 2008年第5期6卷 317-319页

作者：陈振辉鹿博徐志学庄伟于闯于得水黄凯凯陈徐宗陈景标 School of Electronics engineering and computer Science Peking University beijing Uni-Quanta co.ltd

Calcium is one prospective element for the modern optical frequency standard. The 423-nm transition line of calcium atoms has been widely used in laser slowing and laser cooling, the precise spectrum measurement, and the magnetic optical trapping （MOT）. However, there is no any available commercial diode laser working at this wavelength. We built a 423-nm laser based on extra bow-tie cavity and by using a Brewstercut uncoated BIBO （BiB306） crystal, which worked at room temperature, with conversion efficiency of 3.75%, and a potential up to 20%.

关键词： Atomic spectroscopy Calcium cooling Frequency standards Laser cooling Natural frequencies Optical materials

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Hot deformation behavior and finite element simulation of Mg-8.3Gd-4.4Y-1.5Zn-0.8Mn alloy

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Journal of Rare Earths 2022年第5期40卷 831-839,I0006页

作者： Jiabin Fan Minglong Ma Kui Zhang Yongjun Li Xinggang Li Guoliang Shi Jiawei Yuan State Key Laboratory of Nonferrous Metals and Process GRINM Co.Ltd..Beijing 100088China GRIMAT engineering Institute co.ltd Beijing 101407China General research Institute for Nonferrous Metals Beijing 100088China

To study the hot deformation behavior of Mg-8.3 Gd-4.4 Y-1.5 Zn-0.8 Mn(wt%) alloy,hot compression tests were conducted using a Gleeble-3500 thermal simulator at temperatures ranging from 653 to773 K,true strain rates of 0.001-1 s^(-1),and a deformation degree of 60%.Results of hot compression experiments show that the flow stress of the alloy increases with the strain *** true stress-true strain curves are corrected by correcting the effect of temperature rise in the deformation *** energy,Q,equal to 287380 J/mol and material constant,n,equal to 4.59 were calculated by fitting the true stress-true strain ***,the constitutive equation was established and verified via finite element *** of the hot processing map show that the probability of material instability increases with the degree of deformation,which indicates that the material is not suitable for large deformation in a single *** the whole,the alloy is appropriate for multipass processing with small deformation and a suitable processing temperature and strain rate are 733 K and 0.01 s-1,respectively.

关键词： Mg-Gd-Y-Zn-Mn alloy Hot deformation constitutive relationship Finite element simulation Processing map Rare earths

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research on the Glass Transition Temperature and Mechanical Properties of Poly(vinyl chloride)/Dioctyl Phthalate (PVC/DOP) Blends by Molecular Dynamics Simulations

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Chinese Journal of Polymer Science 2019年第8期37卷 834-840页

作者： Jing Li Shao-Hua Jin Guan-Chao Lan Zi-Shuai Xu Lu-Ting Wang Na Wang Li-Jie Li School of Materials Science and engineering Beijing Institute of Technology Beijing 100081 China research Institute of Gansu Yin Guang Chemical Industry Group co.ltd Baiyin 730900 China

To effectively improve the performance and expand the applications of polymers, molecular dynamics(MD) simulations with the coMPASS force field have been applied to predict the miscibility, glass transition temperature(Tg), and mechanical properties of poly(vinyl chloride)/dioctyl phthalate(PVC/DOP) blends. The solubility parameter values obtained are in good agreement with the reference data and the little difference(|Δδ|components indicates that PVC/DOP is a miscible system. Tg is predicted by the slope of the free volume and density versus temperature simulation data based on density and free volume theory which is agree well with the experimental data. In addition, the analyses of mechanical properties results indicate that the values of Young’s modulus(E), bulk modulus(K), and shear modulus(G) decrease with the addition of DOP, demonstrating that the rigidity of material is weakened and the ductility is improved. The mechanical properties can also be effectively improved by increasing the temperature, which may provide a more flexible mixture, with lower E, K, G but an increased ductility.

关键词： Poly(vinyl chloride)(PVC) Dioctyl phthalate (DOP) MD simulations Glass transition temperature Mechanical properties

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