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中国科学:技术科学（英文版）
中国科学:技术科学（英文版）

周光召

月刊

1674-7321

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010-64019820

100717

北京东黄城根北街16号

中国科学:技术科学（英文版）/Journal Science China Technological SciencesCSCDCSTPCDEISCI
查看更多>>《中国科学》是中国科学院主办、中国科学杂志社出版的自然科学专业性学术刊物。《中国科学》任务是反映中国自然科学各学科中的最新科研成果，以促进国内外的学术交流。《中国科学》以论文形式报道中国基础研究和应用研究方面具有创造性的、高水平的和有重要意义的科研成果。在国际学术界，《中国科学》作为代表中国最高水平的学术刊物也受到高度重视。国际上最具有权威的检索刊物SCI，多年来一直收录《中国科学》的论文。1999年《中国科学》夺得国家期刊奖的第一名。
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    Sparse convolutional model with semantic expression for waste electrical appliances recognition

    HAN HongGuiLIU YiMingLI FangYuDU YongPing...
    2881-2893页
    查看更多>>摘要：Deep neural networks play an important role in the recognition of waste electrical appliances.However,deep neural network components still lack reliability in decision-making features.To address this problem,a sparse convolutional model with semantic expression(SCMSE)is proposed.First,a low-rank sparse semantic expression component,combining the benefits of residual networks and sparse representation,is adapted to enhance sparse feature extraction and semantic expression.Second,a reliable network architecture is obtained by iterating the optimal sparse solution,enhancing semantic expression.Finally,the results of visualization experiments on the waste electrical appliances dataset demonstrate that the proposed SCMSE can obtain excellent semantic performance.
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    In situ and on-line monitoring of cadmium in soil pore water using an automatic sampling integrated electrochemical sensor

    KUANG JiaJieWEN JunLinCAI XiXiZHOU LiHua...
    2894-2904页
    查看更多>>摘要：Cadmium(Cd)contamination in soil pore water is the primary pathway for Cd uptake by food crops,such as rice(Oryza sativa L.),posing significant risks to both food safety and human health.This study presents a novel soil pore water metal sensor(SPW-Msensor)for in situ and online monitoring of Cd in soil pore water(Cdpw).The SPW-Msensor integrates an automated sampling device,comprising a Rhizon sampler and a reciprocating series pump with an independent dual plunger drive,along with a portable electrochemical sensor consisting of a screen-printed electrode,flow cell,and portable potentiostat.The SPW-Msensor enables the detection of Cd within a linear range of 50 to 300 ppb while exhibiting high anti-interference capability.Moreover,it demonstrates excellent repeatability(relative standard deviation values(RSDs)＜3.6％)across 30 measurements conducted within a 2-h period.The method exhibits good agreement with results obtained using the standard ICP-MS method(RSDs＜5％).Additionally,this study establishes a positive correlation between Cdpw detected by the SPW-Msensor and total Cd concentration(Cdtotal)in the soil with an R2 value equal to 0.89.Data acquired from the SPW-Msensor can be utilized for predicting Cdtotal through partial least squares regression modeling,achieving model quality score(Q2)of 0.69,adjusted R2 of 0.9345,and root mean square error(RMSE)of 0.1912.The SPW-Msensor demonstrates real-time monitoring capabilities for assessing Cd levels in acidified soils.This SPW-Msensor offers an efficient approach for in-situ and continuous monitoring of Cdpw that provides valuable insights applicable to environmental and agricultural domains.
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    Laser welding study of vacuum sintered HUST-1 lunar regolith simulant

    HAN WenBinDING LieYunZHOU ChengZHOU Yan...
    2905-2918页
    查看更多>>摘要：Efforts are underway to establish a permanent lunar base on the Moon.In situ lunar regolith is anticipated to be useful as a building material after sintering.However,sintering lunar regolith into a large-scale structure presents challenges.Therefore,the key to lunar construction lies in assembling multiple small-sized sintered modules into a stable,large-sized structure.This study explored the feasibility of welding the sintered HUST-1 lunar regolith simulant(HLRS)using a laser device and conducted experiments using lasers of varying power.The microstructure,mineral composition,element distribution,and shear strength of the welded joint were investigated.A few low-melting minerals were fused and vaporized during welding,leading to the generation of thermal decomposition gas.Furthermore,the welded joint exhibited numerous micro-cracks,pores,and bubbles,resulting in reduced weld shear strength.Finally,the influence of laser power on weld shear strength was investigated,revealing that the highest shear strength(15.69 N/cm)was achieved at a laser power of 1000 W.This study demonstrates the feasibility of laser welding of sintered HLRS for the first time,with potential applications in lunar base construction.
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    Formation estimation and evolution mechanism of the pressure arch for non-circular tunnels under asymmetrical stress field

    SUN ZhenYuZHANG DingLiXU TongCHEN Xu...
    2919-2938页
    查看更多>>摘要：The tunneling-induced stress redistribution is dependent on the tunnel shape and the in-situ stress field,and the previous arch characterization method based on the circumferential or maximum principal stresses is only suitable for the circular tunnels under the hydrostatic stress field.In this study,a unified characterization method of the pressure arch for non-circular tunnels under the arbitrary stress field is proposed.By comparing the variations of compressive stress in different directions due to excavation,the ratio of the most significant increase in compressive stress is presented to characterize the arch effect,and the corresponding numerical algorithm is given.Since the proposed method takes the stress element as the basic analytical model,it can be easily applied to various complex excavation situations.Thereafter,combined with the established folding catastrophic model,an objective and unified quantitative method of the pressure arch boundaries is given.Using the proposed method,the longitudinal evolution of the pressure arch is analyzed.According to the expansion rate of the arch boundaries,three evolution stages including the initial formation,rapid expansion and stabilization are categorized.Parametric studies are conducted to illustrate the effect of ground properties and support stiffness on the pressure arch formation.It is found that the ground strength parameters and burial depth affect the arch range at a decreasing rate,while they have little effect on the arch shape.The lateral pressure coefficient has a significant effect on both the shape and range of the pressure arch.Increasing the support stiffness helps reduce the pressure arch range with a decreasing rate,while the synchronous variation of the elastic moduli of the surrounding rock and support does not affect the arch range under a certain relative elastic modulus.Finally,field monitoring is conducted to validate the proposed method in actual support design.
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    A novel method for vibration signal transmission and attenuation analysis in complex planetary gearboxes

    WEI ChaoHuCAO HongRuiSHI JiangHaiYANG Yang...
    2939-2953页
    查看更多>>摘要：Planetary gearboxes play a crucial role in altering rotary speed and transmitting power in large machines like wind turbines and sophisticated vehicles.There are many nonlinear interfaces,such as splines,bearings,and gear pairs,in planetary gearboxes,and the resulting vibration signal transmission and attenuation mechanisms are still unknown.In this study,a novel method for quantitatively analyzing the transmission and attenuation of vibration signals is proposed.A multibody dynamic model of the planetary gearbox considering nonlinear gear meshing is presented and experimentally validated.To avoid the interference of foundation vibration on the transmission of the fault signal,the fault impact factor(FIF)is used to describe the intensity of the failure,which aligns well with the experimental signals.Based on the FIF,the vibration signal attenuation of nonlinear interfaces such as splines,bearings,and gear meshing interfaces is quantitatively evaluated.To clarify the transfer paths of fault vibration signals inside the gearbox,the transfer path area method(TPAM)based on FIF is proposed.According to the simulated results,the primary transfer paths of fault vibration signals within the gearbox have been identified,which is of great help in under-standing the transmission and attenuation of vibration signals in planetary gearboxes.
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    Construction and manipulation of origami-inspired tubular structures with controlled mechanical buckling for collection and transportation of microspheres based on optically induced electrokinetics

    YANG WenGuangWANG WenHaoTENG XiangYuQIAO ZeZheng...
    2954-2964页
    查看更多>>摘要：The development of microengineered hydrogels has opened up unlimited possibilities for designing complex structures at the microscale.In this study,we constructed an origami-inspired tubular structure with controlled mechanical buckling based on optically induced electrokinetics(OEK).By inducing a stress gradient in the thickness,a tubular structure can be formed from a poly(ethylene glycol)diacrylate(PEGDA)hydrogel film of various shapes that have been custom fabricated.To achieve an ideal three-dimensional(3D)structure,the amplitude of the tubular structure can be controlled by adjusting the aspect ratios or polymerization time.Furthermore,the tubular structure can be manipulated for the collection and transportation of microspheres.In summary,we provide an effective method for designing 3D structures at the micro-nano scale.This forming method holds great potential for achieving various functions in tissue engineering,drug packaging,and transportation in the future.
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    A novel multi-channel CNN-LSTM and transformer-based network for diesel engine misfire diagnosis under different noise conditions

    LI OuLEI JunBoQIN ChengJinZHANG ZhiNan...
    2965-2967页
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    D-band 4600 m wireless transmission with rates exceeding 100 Gbit/s based on photonics aided technologies

    ZHAO XianMingYU JianJunYANG XiongWeiWEI Yi...
    2968-2970页
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