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Accuracy and Consistency of the Explicit-Invariant Energy Quadratization Approach for the Cahn-Hilliard Equation

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Journal of Mathematical Research with Applications 2025年第1期 84-104页

作者： Jun zhang Fangying SONG yu zhang Computational Mathematics Research Center Guizhou University of Finance and Economics School of mathematics and statistics Guizhou University of Finance and Economics School of Mathematics and Stastistics Fuzhou University

It is well known that the explicit-invariant energy quadratization (EIEQ) approach can generate fully decoupled, linear and unconditionally energy-stable numerical schemes, so it is favored by many researchers. However, the undeniable fact is that the numerical method obtained by EIEQ approach preserves the “modified” energy law instead of the original *** is mainly due to the introduction of some auxiliary variables in EIEQ scheme, and the truncation error will make the auxiliary variables deviate from the original definition in the process of numerical calculation. The primary objective of this paper is to address this gap by providing the accuracy and consistency of the EIEQ method in the context of the CahnHilliard equation. We introduce a relaxation technique for auxiliary variables and construct two numerical schemes based on EIEQ. The analysis results show that the newly constructed schemes are not only unconditionally energy stable, linear and fully decoupled, but also can effectively correct the errors introduced by auxiliary variables and follow the original energy ***, several 2D and 3D numerical examples illustrate the accuracy and efficiency of the newly constructed numerical schemes.

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Electronic Nose with an Air Sensor Matrix for Detecting Beef Freshness

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Journal of Bionic Engineering 2008年第1期5卷 67-73页

作者： zhe zhang Jin Tong Dong-hui Chen yu-bin Lan Key Laboratory of Terrain-Machine Bionics Engineering （Ministry of Education China） Jilin University Changchun 130022 P. R. China Aerial Application Technology USDA-ARS-SPARC-APMRU College Station TX 77845 USA

China is one of the largest meat producing countries in the wodd. With the growing concern for food safety more attention has been paid to meat quality. The application of conventional test methods for meat quality is limited by many factors, and subjectiveness, such as longer time to prepare samples and to test. A sensor matrix was constructed with several separate air sensors, and tests were conducted to detect the freshness of the beef. The results show that the air sensors TGS2610, TGS2600, TGS2611, TGS2620 and TGS2602 made by Tianjin Figaro Electronic Co, Ltd could be used to determine the degree of freshness but TGS2442 is not suitable. This study provides a foundation for designing and making an economical and practical detector for beef freshness.

关键词： gas sensitive sensor matrix degree of beef freshness electronic nose

Intraspecific floral colour variation in three Pedicularis species

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Plant Diversity 2024年第2期46卷 274-279页

作者： Qiu-yu zhang zhe Chen Hang Sun Yang Niu State Key Laboratory of Plant Diversity and Specialty Crops Kunming Institute of BotanyChinese Academy of SciencesKunming 650201YunnanChina University of Chinese Academy of Sciences Beijing 100049China

Flower constancy describes the phenomenon that pollinators tend to successively visit flowers of a single species during foraging,reducing reproductive interference in natural *** extent of flower constancy is largely determined by the floral traits of co-flowering *** higher inter-specific and lower intraspecific differences of floral traits should contribute to a higher level of flower ***,previous studies mainly focused on interspecific difference,and the intraspecific variation(consistency)of floral traits received much less *** hypothesise that selection may favour lower intraspecific floral trait variation in communities composed of multiple co-flowering *** investigated the floral colour variation of three focal Pedicularis species that share pollinators in 19communities composed of either single or multiple Pedicularis *** was quantified using image-based colour analysis as perceived by *** found that most of the intrapopulation floral colour variation was below the colour discrimination threshold of bumblebees,implying strongly constrained by the visual selection by *** to the hypothesis,there is no significant difference in intraspecific floral colour variation between different community *** may be due to the relatively large interspecific floral colour differences of most co-flowering *** influence of community context on intraspecific variation may be reflected in floral traits other than colours.

关键词： Flower constancy Floral colour variation Plantepollinator interactions Pollinator vision

High-Temperature Oxidation Behavior and Related Mechanism of RuT400 Vermicular Graphite Iron

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Acta Metallurgica Sinica(English Letters) 2022年第7期35卷 1117-1130页

作者： yu Chen Jian-chao Pang Shou-xin Li zhe-feng zhang Henan Institute of Advanced Technology Zhengzhou UniversityZhengzhou 450001China Shi-Changxu Innovation Center for Advanced Materials Institute of Metal ResearchChinese Academy of SciencesShenyang 110016China

The vermicular graphite iron is an important material with excellent combination properties for cylinder heads of diesel engines,and the high-temperature oxidation is a crucial problem during service of the *** this study,the oxidation experiment of RuT400 vermicular graphite iron was performed at 500 ℃,and the oxidation time was chosen as 100 h,200 h,300 h,400 h,and 500 h,***,the corresponding microstructure evolution,oxidation kinetics,and oxidation mechanism were *** is found that oxidation pores and oxide layer often appear at the vermicular graphite on the specimen surface;the vermicular graphite plays the role of oxidation channel,and it tends to diff use along the adjacent pearlite and then connect with each other to form oxidation bridges as the oxidation time prolongs.A linear relationship between oxidation weight gain and the thickness of the oxide layer was established and verifi ed *** results will give a more comprehensive understanding on the oxidation mechanism of vermicular graphite iron and provide certain guidance for design and preparation of anti-oxidation cast irons.

关键词： Vermicular graphite iron High-temperature oxidation Microstructure evolution Oxidation mechanism

Single Fe atom-anchored manganese dioxide for efficient removal of volatile organic compounds in refrigerator

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Nano Research 2024年第5期17卷 3927-3933页

作者： Yiwen Wang Jun zhang Yongfei zhang yu zhang zhe Wang Jing Wang yuen Wu Department of Endocrinology the First Affiliated Hospital of USTCDivision of Life Science and MedicineUniversity of Science and Technology of ChinaHefei 230001China School of Chemistry and Materials Science University of Science and Technology of ChinaHefei 230026China Hefei Hualing Co. LtdHefei 230088China Linkway Technology Co. LtdResearch Institute of Single Atom Catalysts Industry TechnologyNanning 530000China

The efficient and rapid removal of volatile organic compounds(VOCs)holds significant importance for ensuring food quality and human health,particularly within the low-temperature confined spaces in ***,achieving effective VOCs degradation under such conditions poses challenges in terms of activating inert bonds and facilitating mass *** this study,we propose a novel solution by designing a cleaner module that incorporates 1.07%single Fe atom-anchored manganese dioxide catalysts(FeSAs-MnO_(2)).The combination of single Fe atoms and defect-rich MnO_(2) substrate efficiently activates molecular oxygen,leading to enhanced generation of highly reactive oxygen species(ROS).Non-thermal plasma(NTP)and circulating fan are introduced to facilitate the regeneration of catalytic activity and improve mass *** FeSAs-MnO_(2) cleaner module demonstrates exceptional performance in trimethylamine(TMA)removal,achieving a conversion efficiency of 98.9%for 9 ppm within just 9 ***,accelerated aging tests predict an extended service life of up to 45 years for the FeSAs-MnO_(2) cleaner module,surpassing the expected lifespan of refrigerators significantly.

关键词： single atom catalysts volatile organic compounds(VOCs) trimethylamine(TMA) non-thermal plasma(NTP) refrigerator

Fine-needle aspiration cytology of an intrathyroidal nodule diagnosed as squamous cell carcinoma: A case report

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World Journal of Clinical Cases 2021年第32期9卷 9982-9989页

作者： Jin-Yang yu Ying zhang zhe Wang Department of Pathology Shengjing Hospital of China Medical UniversityShenyang 110004Liaoning ProvinceChina

BACKGROUND Both squamous cell carcinoma(SCC)and papillary thyroid carcinoma(PTC)are common malignant tumors in the ***,seldom has SCC of the thyroid been ***,cytological features of SCC and PTC have rarely been *** significance of fine-needle aspiration cytology(FNAC)in the diagnosis of neck masses has been ***,we present an exceedingly rare case of an intrathyroidal SCC diagnosed using FNAC,along with its cytological *** SUMMARY A 66-year-old man presented with a left-sided neck *** examination showed an ill-defined *** appearance was hypoechoic with a few hyperechoic *** of the left thyroid nodule was performed.A cellular smear was obtained,and it showed a large number of neoplastic cells with rich cytoplasm and poor cell *** cell nuclei showed coarse nuclear chromatin and a few enlarged prominent *** increased nuclear/cytoplasm ratio was ***,malignancy was diagnosed without a confirmed tumor *** tumor biopsy was performed to make a definite *** tumor cells showed typical squamous cell *** Head and neck SCC and PTC have different *** are needed to ensure accurate diagnosis using FNAC.

关键词： Fine-needle aspiration cytology Intrathyroidal squamous cell carcinoma Cytology of squamous cell carcinoma in thyroid Cytology of papillary thyroid carcinoma Diagnosis by fine-needle aspiration Case report

Technological breakthroughs and scientific progress of the Chang'e-4 mission

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Science China(Information Sciences) 2020年第10期63卷 5-18页

作者： Weiren WU Dengyun yu Chi WANG Jizhong LIU yuhua TANG He zhang zhe zhang Lunar Exploration and Space Engineer Center China Aerospace Science and Technology Corporation National Space Science Center Chinese Academy of Sciences Institute of Spacecraft System Engineer China Academy of Space Technology

Chang’e-4 is the first man-made probe that accomplished landing and roving on the far side of the Moon, which is viewed as a new milestone in the history of Lunar exploration. Beginning with a brief introduction to the progress of domestic and foreign Lunar exploration, this paper reviews the implementation process of the Chang’e-4 project, sorts out the technical breakthroughs achieved, summarizes the exploration achievements, and provides references for subsequent Lunar exploration.

关键词： Chang'e-4 Moon's far side soft landing Earth-Moon L2 point relay satellite technological breakthrough scientific achievement

Attention Guided Enhancement Network for Weakly Supervised Semantic Segmentation

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Chinese Journal of Electronics 2023年第4期32卷 896-907页

作者： zhang zhe WANG Bilin yu zhezhou ZHAO Fengzhi College of Computer Science and Technology Jilin University Key Laboratory for Symbol Computation and Knowledge Engineering of National Education Ministry

Weakly supervised semantic segmentation using only image-level labels is critical since it alleviates the need for expensive pixel-level labels. Most cuttingedge methods adopt two-step solutions that learn to produce pseudo-ground-truth using only image-level labels and then train off-the-shelf fully supervised semantic segmentation network with these pseudo labels. Although these methods have made significant progress, they also increase the complexity of the model and training. In this paper, we propose a one-step approach for weakly supervised image semantic segmentation—attention guided enhancement network(AGEN), which produces pseudopixel-level labels under the supervision of image-level labels and trains the network to generate segmentation masks in an end-to-end manner. Particularly, we employ class activation maps(CAM) produced by different layers of the classification branch to guide the segmentation branch to learn spatial and semantic ***, the CAM produced by the lower layer can capture the complete object region but with many ***, the self-attention module is proposed to enhance object regions adaptively and suppress irrelevant object regions, further boosting the segmentation *** on the Pascal VOC 2012 dataset demonstrate that AGEN outperforms alternative state-of-the-art weakly supervised semantic segmentation methods exclusively relying on image-level labels.

关键词： Training Annotations Semantic segmentation Scalability Semantics Benchmark testing Boosting

On the improvement of signal repeatability in laser-induced air plasmas

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Frontiers of physics 2018年第2期13卷 85-92页

作者： Shuai zhang Sahar Sheta Zong-yu Hou zhe Wang Department of Thermal Engineering Tsinghua-BP Clean Energy Center Tsinghua University Beijing 100084 China National Institute of Laser Enhanced Science Cairo University Cairo 12613 Egypt

The relatively low repeatability of laser-induced breakdown spectroscopy （LIBS） severely hinders its wide commercialization. In the present work, we investigate the optimization of LIBS system for repeatability improvement for both signal generation （plasma evolution） and signal collection. Time- integrated spectra and images were obtained under different laser energies and focal lengths to inves- tigate the optimum configuration for stable plasmas and repeatable signals. Using our experimental setup, the optimum conditions were found to be a laser energy of 250 mJ and a focus length of 100 ram. A stable and homogeneous plasma with the largest hot core area in the optimum condition yielded the most stable LIBS signal. Time-resolved images showed that the rebounding processes through the air plasma evolution caused the relative standard deviation （RSD） to increase with laser energies of 〉 250 mJ. In addition, the emission collection was improved by using a concave spherical mirror. The line intensities doubled as their RSDs decreased by approximately 25%. When the signal generation and collection were optimized simultaneously, the pulse-to-pulse RSDs were reduced to approximately 3% for O（I）, N（I）, and H（I） lines, which are better than the RSDs reported for solid samples and showed great potential for LIBS quantitative analysis by gasifying the solid or liquid samples.

关键词： laser-induced breakdown spectroscopy (LIBS) repeatability air-plasma signalfluctuations plasma evolution