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Nano Research 2024年第8期17卷 7136-7143页

作者： Lijie Ma Xiaolin Wang Xiang Chen Jianbin Gao Yiwen Wang Yuehai Song Yaran Zhao Shizhe Gao Lin Li Jianchao Sun School of Environment and Material engineering Yantai UniversityYantai 264005China College of Textile Science and engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China BNU-HKUST Laboratory of Green Innovation Advanced Institute of Natural SciencesBeijing Normal UniversityZhuhai 519087China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Vanadium dioxide(VO_(2)) with the advantages of high theoretical capacity and tunnel structure has attracted considerable promising candidates for aqueous zinc-ion ***,the intrinsic low electronic conductivity of VO_(2) results in an unsatisfactory electrochemical ***,a flower-like VO_(2)/carbon nanotubes(CNTs)composite was obtained by a facile hydrothermal *** unique flower-like morphology shortens the ion transport length and facilitates electrolyte ***,the CNT conductive networks is in favor of fast electron transfer.A highly reversible zinc storage mechanism was revealed by ex-situ X-ray diffraction and X-ray photoelectron *** a result,the VO_(2)/CNTs cathode exhibits a high reversible capacity(410 mAh·g^(−1)),superior rate performance(305 mAh·g^(−1)at 5 A·g^(−1)),and excellent cycling stability(a reversible capacity of 221 mAh·g^(−1)was maintained even after 2000 cycles).This work provides a guide for the design of high-performance cathode materials for aqueous zinc metal batteries.

关键词： VO_(2)/carbon nanotubes morphology engineering zinc metal batteries cathode materials conductive networks

Optimization of integrated geological-engineering design of volume fracturing with fan-shaped well pattern

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石油勘探与开发:英文版 2023年第4期50卷 971-978页

作者： TANG Jizhou WANG Xiaohua DU Xianfei MA Bing ZHANG Fengshou School of Ocean and Earth Science Tongji UniversityShanghai 200092China State Key Laboratory of Marine Geology Tongji UniversityShanghai 200092China College of Civil engineering Tongji UniversityShanghai 200092China Key Laboratory of Geotechnical&Underground engineering of Ministry of Education Tongji UniversityShanghai 200092China Oil&Gas Technology Research Institute of PetroChina Changqing Oilfield Company Xi’an 710021China

According to the variable toe-to-heel well spacing, combined with the dislocation theory, discrete lattice method, and finite-element-method(FEM) based fluid-solid coupling, an integrated geological-engineering method of volume fracturing for fan-shaped well pattern is proposed considering the geomechanical modeling, induced stress calculation, hydraulic fracturing simulation, and post-frac productivity evaluation. Besides, we propose the differential fracturing design for the conventional productivity-area and the potential production area for fan-shaped horizontal wells. After the fracturing of the conventional production area for H1 fan-shaped well platform, the research shows that the maximum reduction of the horizontal principal stress difference in the potential productivity-area is 0.2 MPa, which cannot cause the stress reversal, but this reduction is still conducive to the lateral propagation of hydraulic fractures. According to the optimized fracturing design, in zone-Ⅰ of the potential production area, only Well 2 is fractured, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage;in zone-Ⅱ, Well 2 is fractured before Well 3, with a cluster spacing of 30 m and an injection rate of 12 m^(3)/min per stage. The swept area of the pore pressure drop in the potential production area is small, showing that the reservoir is not well developed. The hydraulic fracturing in the toe area can be improved by, for example, properly densifying the fractures and adjusting the fracture distribution, in order to enhance the swept volume and increase the reservoir utilization.

关键词： shale oil fan-shaped well pattern horizontal well geological model hydraulic fracturing productivity evaluation integrated geological-engineering design

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integrated pathway engineering and transcriptome analysis for improved astaxanthin biosynthesis in Yarrowia lipolytica

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Synthetic and Systems Biotechnology 2022年第4期7卷 1133-1141页

作者： Dan-Ni Wang Jie Feng Chen-Xi Yu Xin-Kai Zhang Jun Chen Liu-Jing Wei Zhijie Liu Liming Ouyang Lixin Zhang Qiang Hua Feng Liu State Key Laboratory of Bioreactor engineering East China University of Science and Technology130 Meilong RoadShanghai200237PR China Key Laboratory of Fermentation engineering(Ministry of Education) Cooperative Innovation Center of Industrial Fermentation(Ministry of Education&Hubei Province)Hubei Key Laboratory of Industrial MicrobiologyHubei University of TechnologyWuhan430068China Shanghai Collaborative Innovation Center for Biomanufacturing Technology 130 Meilong RoadShanghai200237China

Astaxanthin is a high value carotenoid with a broad range of commercial applications due to its superior antioxidant *** this study,β-carotene-producing Yarrowia lipolytica XK17 constructed in the lab was employed for astaxanthin *** catalytic effects ofβ-carotene ketolase CrtW andβ-carotene hydroxylase CrtZ from various species were *** PspCrtW from Paracoccus *** HpCrtZ^(#) from Haematococcus pluvialis were confirmed to be the best combination in convertingβ-*** key bottlenecks in biomass and astaxanthin biosynthesis were effectively eliminated by optimizing the expression of the above enzymes and restoring uracil/leucine *** addition,the effects of astaxanthin biosynthesis on cell metabolism were investigated by integrated analysis of pathway modification and transcriptome *** further optimization,strain DN30 was able to synthesize up to 730.3 mg/L astaxanthin in laboratory 5-L *** study provides a good metabolic strategy and a sustainable development platform for high-value carotenoid production.

关键词： Astaxanthin Pathway engineering Transcriptome analysis Yarrowia lipolytica

Promoting the application of pediatric radiomics via an integrated medical engineering approach

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Cancer Innovation 2023年第4期2卷 302-311页

作者： Haige Zheng Fang Wang Yang Li Zhicheng Li Xiaochun Zhang Xuntao Yin Department of Radiology Guangzhou Women and Children's Medical CenterGuangdong Provincial Clinical Research Center for Child HealthGuangzhouChina Lianying Intelligent Medical Technology(Chengdu)Co. Ltd.ChengduChina Institute of Biomedical and Health engineering Shenzhen Institute of Advanced TechnologyChinese Academy of SciencesShenzhenChina

Radiomics is widely used in adult tumors but has been rarely applied to the field of *** the application of radiomics in pediatric diseases,especially in the early diagnosis and stratified treatment of tumors,is of great value to the realization of the WHO 2030“Global Initiative for Childhood Cancer.”This paper discusses the general characteristics of radiomics,the particularity of its application to pediatric diseases,and the current status and prospects of pediatric *** is a data-driven science,and the combination of medicine and engineering plays a decisive role in improving data quality,data diversity,and sample *** with adult radiomics,pediatric radiomics is significantly different in data type,disease spectrum,disease staging,and *** progress has been made in the identification,classification,stratifica-tion,survival prediction,and prognosis of tumor *** the future,big data applications from multiple centers and cross-talent training should be strengthened to improve the benefits for clinical workers and children.

关键词： radiomics pediatrics oncology survivalprediction

Mitigate noisy data for smart IoT via GAN based machine unlearning

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Science China(Information Sciences) 2024年第3期67卷 62-78页

作者： Zhuo MA Yilong YANG Yang LIU Xinjing LIU Jianfeng MA School of Cyber engineering Xidian University State Key Laboratory of integrated Services Networks (ISN)

With the development of IoT applications, machine learning dramatically improves the utility of variable IoT systems such as autonomous driving. Although the pretrain-finetune framework can cope well with data heterogeneity in complex IoT scenarios, the data collected by sensors often contain unexpected noisy data, e.g., out-of-distribution(OOD) data, which leads to the reduced performance of fine-tuned models. To resolve the problem, this paper proposes Mu GAN, a method that can mitigate the side-effect of OOD data via the generative adversarial network(GAN)-based machine unlearning. Mu GAN follows a straightforward but effective idea to mitigate the performance loss caused by OOD data, i.e., “flashbacking” the model to the condition where OOD data are excluded from model training. To achieve the goal, we design an adversarial game, where a discriminator is trained to identify whether a sample belongs to the training set by observing the confidence score. Meanwhile, a generator(i.e., the target model) is updated to fool the discriminator into believing that the OOD data are not included in the training set but others do. The experimental results show that benefiting from the high unlearning rate(more than 90%) and retention rate(99%), Mu GAN succeeds in lowering the model performance degradation caused by OOD data from 5.88% to 0.8%.

关键词： machine unlearning generative adversarial network out of distribution data Internet of Thing neural network

Transparent micropatterned conductive films based on highlyordered nanowire network

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Nano Research 2024年第5期17卷 4288-4297页

作者： Xin-Ran Zhang Hai-Tao Deng Xu Zeng Yi-Lin Wang Peng Huang Xiao-Sheng Zhang School of integrated Circuit Science and engineering University of Electronic Science and Technology of ChinaChengdu 611731China

Transparent conductive films that are based on nanowire networks are essential to construct flexible,wearable,and even stretchable ***,large-scale precise micropatterning,especially with regard to the controllability of the organizing orientation of nanowires,is a critical ***,we proposed a liquid film rupture self-assembly approach for manufacturing transparent conductive films with microstructure arrays based on a highly ordered nanowire *** large-scale microstructure conductive films were fabricated through air-liquid interface self-assembly and liquid film rupture *** typical micropattern morphologies,including square,hexagon,circle,serpentine,etc.,were prepared to reveal the universal applicability of the proposed *** homogeneity and controllability of this approach were verified for multiple *** the assembly cycles increasing,the optical transmittance decreases *** addition,theoretical model analysis is carried out,and the analytical formula of the speed of the film moving with the surface tension and the density of the liquid film is ***,the feasibility of this approach for piezoresistive strain sensors is *** fabrication approach demonstrated a cost-effective and efficient method for precisely arranging nanowires,which is useful in transparent and wearable applications.

关键词： flexible electronics transparent conductive network micropatterning nanowires micro electromechanical systems(MEMS)

Single-structure 3-axis Lorentz force magnetometer based on an AlN-on-Si MEMS resonator

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Microsystems & Nanoengineering 2024年第3期10卷 75-86页

作者： Cheng Tu Xu-heng Ou-Yang Ying-jie Wu Xiao-sheng Zhang School of integrated Circuit Science and engineering University of Electronic Science and Technology of ChinaChengdu 611731China

This work presents a single-structure 3-axis Lorentz force magnetometer(LFM)based on an AlN-on-Si MEMS *** operation of the proposed LFM relies on the flexible manipulation of applied excitation currents in different directions and frequencies,enabling the effective actuation of two mechanical vibration modes in a single device for magnetic field measurements in three ***,the excited out-of-plane drum-like mode at 277 kHz is used for measuring the x-and y-axis magnetic fields,while the in-plane square-extensional mode at 5.4 MHz is used for measuring the z-axis magnetic *** different configurations of applied excitation currents ensure good crossinterference immunity among the three *** to conventional capacitive LFMs,the proposed piezoelectric LFM utilizes strong electromechanical coupling from the AlN layer,which allows it to operate at ambient pressure with a high *** understand and analyze the measured results,a novel equivalent circuit model for the proposed LFM is also reported in this work,which serves to separate the effect of Lorentz force from the unwanted capacitive *** demonstrated 3-axis LFM exhibits measured magnetic responsivities of 1.74 ppm/mT,1.83 ppm/mT and 6.75 ppm/mT in the x-,y-and z-axes,respectively,which are comparable to their capacitive counterparts.

关键词： resonator Lorentz structure

A novel small-signal equivalent circuit model for GaN HEMTs incorporating a dual-field-plate

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Journal of Semiconductors 2024年第5期45卷 61-68页

作者： Jinye Wang Jun Liu Zhenxin Zhao School of integrated Circuit Science and engineering Hangzhou Dianzi UniversityHangzhou 310018China

An accurate and novel small-signal equivalent circuit model for GaN high-electron-mobility transistors(HEMTs)is proposed,which considers a dual-field-plate(FP)made up of a gate-FP and a *** equivalent circuit of the overall model is composed of parasitic elements,intrinsic transistors,gate-FP,and source-FP *** equivalent circuit of the gate-FP is identical to that of the intrinsic *** order to simplify the complexity of the model,a series combination of a resistor and a capacitor is employed to represent the *** analytical extraction procedure of the model parameters is presented based on the proposed equivalent *** verification is carried out on a 4×250μm GaN HEMT device with a gate-FP and a source-FP in a 0.45μm *** with the classic model,the proposed novel small-signal model shows closer agreement with measured S-parameters in the range of 1.0 to 18.0 GHz.

关键词： small-signal model dual field-plate(FP) GaN high-electron-mobility transistors(HEMT) parameter extraction

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Realization of Complete Boolean Logic and Combinational Logic Functionalities on a Memristor-Based Universal Logic Circuit

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Chinese Journal of Electronics 2024年第5期33卷 1137-1146页

作者： Xiaojuan LIAN Chuanyang SUN Zeheng TAO Xiang WAN Xiaoyan LIU Zhikuang CAI Lei WANG College of integrated Circuit Science and engineering Nanjing University of Posts and Telecommunications

Memristors are a promising solution for building an advanced computing system due to their excellent characteristics, including small energy consumption, high integration density, fast write/read speed, great endurance and so on. In this work, we firstly design three basis logic XNOR1, XNOR2 and XOR gates by virtue of memristor ratioed logic(MRL), and further construct 1-bit numerical comparators, 2-bit numerical comparators and full adder 1 based on the above XNOR1, XNOR2 and XOR gates. Furthermore, we propose and design a universal logic circuit that can realize four different kinds of logic functions(AND, OR, XOR, XNOR) at the same time. Subsequently, a full adder 2 is built using XOR function of this universal logic circuit. Compared with the traditional CMOS circuits,the universal logic circuit designed in this work exhibits several merits such as fewer components, less power, and lower delay. This work demonstrates that memristors can be used as a potential solution for building a novel computing architecture.

关键词： Power demand Logic circuits Buildings Memristors Logic gates Logic functions Software Memristor Universal logic circuit Memristor ratioed logic Numerical comparator Full adder DESIGN DELAY

Transient features of graphitization and nitrogen-vacancy color centers in a diamond fabricated by localization femtosecond laser direct writing

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Science China(Technological Sciences) 2024年第8期67卷 2530-2536页

作者： CUI Lin YIN SiYu HU ZiFan WANG Lei State Key Laboratory of integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China

Femtosecond laser direct writing provides an efficient approach to fabricating single nitrogen vacancy(NV) color centers with a relatively high yield. Different from previously reported NV color centers with a random distribution in a bulk diamond or nanocrystals, this gives an opportunity to study the photophysical properties of single NV color centers with precise numbers and positions. However, ultrafast studies on single NV color centers prepared by localization femtosecond laser direct writing are still rare, especially for the graphitization inside a diamond and its relationship with single NV color centers. Here, we report the broadband transient absorption(TA) spectroscopic features of the graphitization and NV color centers in a diamond fabricated by localization femtosecond laser direct writing at room temperature under 400 nm excitation. In comparison with the graphene oxide film, the bleaching features of the graphitization point array in a diamond are similar to reduced graphene oxide,accompanied by excited state absorption signals from local carbon atom vacancy defects in graphene-like structures induced by laser writing. On the other hand, transient features of laser processing array containing single NV color centers with a yield of~50% are different from those of the graphitization point array. Our findings suggest that for ultrashort pulse processing of diamonds, broadband TA spectral signals are sensitive to the surrounding atomic environment of processing sites, which could be applied to laser writing point defects in other materials used as solid-state single photon sources.

关键词： nitrogen-vacancy color center graphitization diamond femtosecond laser direct writing ultrafast spectroscopy

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