Effect of Annealing on Lattice Strain and Near-Band-Edge Emission of ZnO Nanorods

Musbah Babikier,Jinzhong Wang,Dunbo Wang,Qian Li,Jianming Sun,Yuan Yan,Wenqi Wang,Qingjiang Yu,Shujie Jiao,Shiyong Gao,Hongtao Li 대한금속·재료학회 2014 ELECTRONIC MATERIALS LETTERS Vol.10 No.4

The effect of air and oxygen annealing on the structural and the optical properties of hydrothermally synthesized ZnO nanorods was investigated. After hydrothermal synthesis, the resulting ZnO nanorods were annealed in air and under an oxygen atmosphere at 370°C for 1 h. X-ray diffraction results revealed that the oxygen-annealed nanorods possessed high crystallinity with a hexagonal-wurtzite crystal structure in the (002) plane. Evaluation of strain showed a tensile lattice strain of 0.426% resulting from oxygen annealing. The photoluminescence measurements showed that the relative intensity ratio of the near-band-edge emission (NBE) to the green emission (INBE/IGE) increased from ~2.6 for the as-grown ZnO nanorods to ~68.7 when the nanorods were annealed under oxygen. After annealing, a red shift of ~30 and ~44 meV in the NBE was observed for the nanorods that were annealed in air and under oxygen, respectively. This shift is attributed to the interaction between the neutral acceptors and the adsorbed oxygen atoms.

Rational design of porous NiCo2S4 nanotubes for hybrid supercapacitor

Wang Haiyang,Liang Miaomiao,He Zemin,Guo Zhun,Zhao Yang,Li Kexuan,Song Wenqi,Zhang Yongming,Zhang Xin,Zhao Yuzhen,Miao Zongcheng 한국물리학회 2022 Current Applied Physics Vol.35 No.-

The nanotube-consisted flower-like NiCo2S4 is successfully fabricated by a novel two-step hydrothermal technique. X-ray diffraction (XRD) identifies the spinel structure, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) imply the flower-like morphology of the synthesized NiCo2S4. The electrochemical behaviors are studied by cyclic voltammetry and galvanostatic charge-discharge measurements. The NiCo2S4 nanotubes demonstrate enhanced pseudocapacitive performance of 429.5 C g− 1 at current density of 0.5 A g− 1 . The NiCo2S4//AC device delivers high energy density of 37.69 Wh kg− 1 , maximum power density of 4000.6 W kg− 1 and satisfied cycle property of 96% capacitance retention after over 7000 cycles. The results show that the NiCo2S4 nanotubes are promising electrode material for high performance supercapacitor applications.

Observer-based Adaptive Neural Network Output-feedback Control for Nonlinear Strict-feedback Discrete-time Systems

Wenqi Xu,Xiaoping Liu,Huanqing Wang,Yucheng Zhou 제어·로봇·시스템학회 2021 International Journal of Control, Automation, and Vol.19 No.1

This paper focuses on an observer-based output-feedback controller design for a nonlinear discrete-timesystem. The major characteristics of this system is that all of the subsystems are in strict-feedback form and all thestates of the system are not measurable. An output tracking control problem is firstly considered in this paper. NNsare utilized to approximate unknown functions, while a state observer is designed to approximatethe unvailablestates. An adaptive controller is designed on the basis of the backstepping technique. On the basis of the Lyapunovanalysis approach, the boundedness of all the signals is provided. The feasibility of the proposed scheme is verifiedthrough a simulation example.

Enhanced Solo-Based Instance Segmentation Algorithm for Efficient Plant Growth Assessment: A Radish Case Study

Wenqi Zhang,L. Minh Dang,Yanfen Li,Hanxiang Wang,Sujin Lee,Hyeonjoon Moon 한국방송·미디어공학회 2023 한국방송공학회 학술발표대회 논문집 Vol.2023 No.6

The dimensions of plants, including their length and width, as well as the size of their leaves, serve as crucial indicators for assessing their growth status. These factors provide essential data for studying plant conditions. This article introduces an algorithm for instance segmentation based on Solo, with the addition of a residual block module to enhance segmentation performance. The original rectified linear unit (ReLU) activation function is replaced with a functional ReLU (PReLU), and an open turnip segmentation dataset is proposed. Experimental results demonstrate that, in comparison to the original model, the average accuracy of the modified model reaches 87.6%, an improvement of approximately 2.0%. The improved algorithm accurately segments turnips and their leaves, exhibiting superior accuracy in measuring both turnip and leaf dimensions. Compared to manual measurements, the average accuracy for turnip length is 97.38%, turnip width is 95.46%, turnip leaf length is 97.79%, and turnip leaf width is 96.13%.

Inactivation of epithelial sodium ion channel molecules serves as effective diagnostic biomarkers in clear cell renal cell carcinoma

Zheng Qian,Wang Yifang,Zhao Ran,Han Peipei,Zhao Jun,Li Limei,Zhou Xiaohui,Li Ping,Mo Yingxi,Pan Xinli,Luo Wenqi,Zhou Xiaoying 한국유전학회 2023 Genes & Genomics Vol.45 No.7

Background Non-voltage-gated sodium channel, also known as the epithelial sodium channel (ENaC), formed by heteromeric complexes consisting of SCNN1A, SCNN1B, and SCNN1G, is responsible for maintaining sodium ion and body fluid homeostasis in epithelial cells. However, no systematic study of SCNN1 family members has been conducted in renal clear cell carcinoma (ccRCC) to date. Objective To investigate the abnormal expression of SCNN1 family in ccRCC and its potential correlation with clinical parameters. Methods The transcription and protein expression levels of SCNN1 family members in ccRCC were analyzed based on the TCGA database, and were confirmed by quantitative RT-PCR and immunohistochemical staining assays, respectively. The area under curve (AUC) was used to evaluate the diagnostic value of SCNN1 family members for ccRCC patients. Results The mRNA and protein expression of SCNN1 family members was significantly downregulated in ccRCC compared with normal kidney tissues, which might be due to DNA hypermethylation in the promoter region. It is worth noting that the AUC of SCNN1A, SCNN1B, and SCNN1G were 0.965, 0.979, and 0.988 based on the TCGA database (p < 0.0001), respectively. The diagnostic value was even higher when combing these three members together (AUC = 0.997, p < 0.0001). Intriguingly, the mRNA level of SCNN1A was significantly lower in females compared with males, while SCNN1B and SCNN1G were increased with the progression of ccRCC and remarkably associated with a worse outcome for patients. Conclusion The aberrantly decrease of SCNN1 family members might serve as valuable biomarkers for the diagnosis of ccRCC.

Investigation of the Deformation Characteristics and Bearing Capacity of a Segment Structure of a Shield Tunnel with Cracks

Chuankun Liu,Shimin Wang,Wenqi Guo,Fan Chen,Junbo Zhang,Chuan He 대한토목학회 2022 KSCE Journal of Civil Engineering Vol.26 No.1

In this paper, the displacement data of a segment lining structure in a similar model test were analyzed in depth based on a field investigation and the analysis of a cracked segment in a metro project. In doing so, we proved the displacement characteristics and bearing capacity of shield tunnel segments with different cracks numbers, lengths, and locations. The results showed that the presence of a crack decreases the overall stiffness of the structure relative to an undamaged segment ring and causes the deformation increases with the same load to increase. One-third of the width of a segment is the demarcation point at which the length of the crack begins to affect the mechanical properties of structure of the lining of the segment. When the length of the crack is larger than one-third the width of the segment, the instability of the structure tends to result in sudden failure. Although an increase in the number of cracks does not reduces the ultimate bearing capacity of the structure further, the deformation of the structure of the lining of the segment increases significantly as the number of cracks increases. compared to a crack at the vault and at the arch waist, the ultimate bearing capacity of the segment is the same when the crack is at the bottom of the arch, but the effects of cracks located at the arch bottom in the structural deformation are the most significant.

LSTM Android Malicious Behavior Analysis Based on Feature Weighting

( Qing Yang ),( Xiaoliang Wang ),( Jing Zheng ),( Wenqi Ge ),( Ming Bai ),( Frank Jiang ) 한국인터넷정보학회 2021 KSII Transactions on Internet and Information Syst Vol.15 No.6

With the rapid development of mobile Internet, smart phones have been widely popularized, among which Android platform dominates. Due to it is open source, malware on the Android platform is rampant. In order to improve the efficiency of malware detection, this paper proposes deep learning Android malicious detection system based on behavior features. First of all, the detection system adopts the static analysis method to extract different types of behavior features from Android applications, and extract sensitive behavior features through Term frequency-inverse Document Frequency algorithm for each extracted behavior feature to construct detection features through unified abstract expression. Secondly, Long Short-Term Memory neural network model is established to select and learn from the extracted attributes and the learned attributes are used to detect Android malicious applications, Analysis and further optimization of the application behavior parameters, so as to build a deep learning Android malicious detection method based on feature analysis. We use different types of features to evaluate our method and compare it with various machine learning-based methods. Study shows that it outperforms most existing machine learning based approaches and detects 95.31% of the malware.

Benchtop fabrication of three-dimensional reconfigurable microfluidic devices from paper-polymer composite.

Han, Yu Long,Wang, Wenqi,Hu, Jie,Huang, Guoyou,Wang, Shuqi,Lee, Won Gu,Lu, Tian Jian,Xu, Feng Royal Society of Chemistry 2013 Lab on a chip Vol.13 No.24

<P>We presented a benchtop technique that can fabricate reconfigurable, three-dimensional (3D) microfluidic devices made from a soft paper-polymer composite. This fabrication approach can produce microchannels at a minimal width of 100 μm and can be used to prototype 3D microfluidic devices by simple bending and stretching. The entire fabrication process can be finished in 2 hours on a laboratory bench without the need for special equipment involved in lithography. Various functional microfluidic devices (e.g., droplet generator and reconfigurable electronic circuit) were prepared using this paper-polymer hybrid microfluidic system. The developed method can be applied in a wide range of standard applications and emerging technologies such as liquid-phase electronics.</P>

Synthesis and Enhanced Photocatalytic Activity of Black Porous Zr-doped TiO2 Monoliths

Jimin Du,Huiming Wang,Huijuan Chen,Menghe Yang,Xiaoling Lu,Hui Guo,Zhanmin Zhang,Tianwei Shang,Shujue Xu,Wenqi Li,Pianpian Wang,Imran Shakir 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.6

Black Porous Zr-doped TiO2 monoliths were successfully synthesized by a combined route including sol–gel method with polystyrene spheres as template followed by calcination at high temperature in the presence of oxygen. As-synthesized samples were then treated in hydrogen atmosphere at 500℃ for 6 h to obtain black Porous Zr-doped TiO2 monoliths. This as-synthesized black porous Zr-doped TiO2 composite showed relatively narrow bandgap compared to the pure anatase phase of TiO2, which may have its origin from the contributions from the Zr impurity and oxygen vacancies. The photocatalytic activity of the black porous Zr-doped TiO2 monolith was examined by carrying out the dye degradation on Rhodamine B under visible irradiation. Our experimental results indicate that black porous 0.9% Zr-doped TiO2 sample exhibits high photocatalytic activity with the photodecomposition of 95.25% under visible irradiation for 120 min.

Function of Rhs proteins in porcine extraintestinal pathogenic Escherichia coli PCN033

Lu Wenjia,Tan Jia,Lu Hao,Wang Gaoyan,Dong Wenqi,Wang Chenchen,Li Xiaodan,Tan Chen 한국미생물학회 2021 The journal of microbiology Vol.59 No.9

Extraintestinal pathogenic Escherichia coli (ExPEC) is an important zoonotic pathogen that places severe burdens on public health and animal husbandry. There are many pathogenic factors in E. coli. The type VI secretion system (T6SS) is a nano-microbial weapon that can assemble quickly and inject toxic effectors into recipient cells when danger is encountered. T6SSs are encoded in the genomes of approximately 25% of sequenced Gram-negative bacteria. When these bacteria come into contact with eukaryotic cells or prokaryotic microbes, the T6SS assembles and secretes associated effectors. In the porcine ExPEC strain PCN033, we identified four classic rearrangement hotspot (Rhs) genes. We determined the functions of the four Rhs proteins through mutant construction and protein expression. Animal infection experiments showed that the Δrhs-1CT, Δrhs-2CT, Δrhs-3CT, and Δrhs-4CT caused a significant decrease in the multiplication ability of PCN033 in vivo. Cell infection experiments showed that the Rhs protein is involved in anti-phagocytosis activities and bacterial adhesion and invasion abilities. The results of this study demonstrated that rhs1, rhs3, and rh4 plays an important role in the interaction between PCN033 and host cell. Rhs2 has contribution to cell and mice infection. This study helps to elucidate the pathogenic mechanism governing PCN033 and may help to establish a foundation for further research seeking to identify potential T6SS effectors.