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139 results on '"Du, Guiqiang"'

1. Topological phase transition and interface states in hybrid plasmonic-photonic systems

Author

Ge, Lixin, Liu, Liang, Xiao, Meng, Du, Guiqiang, Shi, Lei, Han, Dezhuan, Chan, C. T., and Zi, Jian

Subjects
Physics - Optics
Abstract

The geometric phase and topological property for one-dimensional hybrid plasmonic-photonic crystals consisting of a simple lattice of graphene sheets are investigated systematically. For transverse magnetic waves, both plasmonic and photonic modes exist in the momentum space. The accidental degeneracy point of these two kinds of modes is identified to be a diabolic point accompanied with a topological phase transition. For a closed loop around this degeneracy point, the Berry phase is Pi as a consequence of the discontinuous jump of the geometric Zak phase. The wave impedance is calculated analytically for the semi-infinite system, and the corresponding topological interface states either start from or terminate at the degeneracy point. This type of localized interface states may find potential applications in photonics and plasmonics., Comment: 5 pages, 4 figures

Published
2017
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2. A Human‐Computer Interaction Strategy for An FPGA Platform Boosted Integrated "Perception‐Memory" System Based on Electronic Tattoos and Memristors.

Author

Li, Yang, Qiu, Zhicheng, Kan, Hao, Yang, Yang, Liu, Jianwen, Liu, Zhaorui, Yue, Wenjing, Du, Guiqiang, Wang, Cong, and Kim, Nam‐Young

Subjects
FIELD programmable gate arrays, ELECTRONIC systems, QUALITY of life, TANTALUM oxide, PATIENT monitoring
Abstract

The integrated "perception‐memory" system is receiving increasing attention due to its crucial applications in humanoid robots, as well as in the simulation of the human retina and brain. Here, a Field Programmable Gate Array (FPGA) platform‐boosted system that enables the sensing, recognition, and memory for human‐computer interaction is reported by the combination of ultra‐thin Ag/Al/Paster‐based electronic tattoos (AAP) and Tantalum Oxide/Indium Gallium Zinc Oxide (Ta2O5/IGZO)‐based memristors. Notably, the AAP demonstrates exceptional capabilities in accommodating the strain caused by skin deformation, thanks to its unique structural design, which ensures a secure fit to the skin and enables the prolonged monitoring of physiological signals. By utilizing Ta2O5/IGZO as the functional layer, a high switching ratio is conferred to the memristor, and an integrated system for sensing, distinguishing, storing, and controlling the machine hand of multiple human physiological signals is constructed together with the AAP. Further, the proposed system implements emergency calls and smart homes using facial electromyogram signals and utilizing logical entailment to realize the control of the music interface. This innovative "perception‐memory" integrated system not only serves the disabled, enhancing human‐computer interaction but also provides an alternative avenue to enhance the quality of life and autonomy of individuals with disabilities. [ABSTRACT FROM AUTHOR]

Published
2024
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3. Enhanced absorption in heterostructures with graphene and truncated photonic crystals

Author

Liu, Yiping, Du, Lei, Dai, Yunyun, Xia, Yuyu, Du, Guiqiang, Lu, Guang, Liu, Fen, Shi, Lei, and Zi, Jian

Subjects
Physics - Optics
Abstract

We theoretically and experimentally investigate the optical absorption properties of heterostructures composed of graphene films and truncated photonic crystals (PCs) in the visible range. The experimental results show that the absorption of the heterostructure is enhanced greatly in the whole forbidden gap of PCs compared with that of graphene alone. The absorption is enhanced over a wide angle of incidence for both transverse electric (TE) and transverse magnetic (TM) polarizations. The enhanced absorption band broadens for TE polarization but narrows for TM polarization as the incident angle increases. In the forbidden gap of the PCs, the maximum absorptance of the heterostructures is nearly four times of that of bare graphene films for arbitrary incident angles and polarizations. The optical experiments are in excellent agreement with the theoretical results., Comment: 19 pages, 5 figures

Published
2016

4. The Engineering of Optical Conservative Force

Author

Du, Junjie, Yuen, Chi-Hong, Ding, Kun, Du, Guiqiang, Lin, Zhifang, Chan, C. T., and Ng, Jack

Subjects
Physics - Optics
Abstract

Optical forces have been fruitfully applied in a broad variety of areas that not only span the traditional scientific fields such as physics, chemistry, and biology, but also in more applied fields. It is customary and useful to split the optical force into the (conservative) gradient force and the (non-conservative) scattering and absorption force. These forces are different in attributes. The ability to tailor them will open great potential in fundamental optics and practical applications. Here, we present an analytical and a numerical approach to calculate these forces, and, with these tools, we create a fairly general class of 2D conservative optical force field. In general, particles immersed in an optical force do not obey equilibrium statistical mechanics, making the analysis complicated. With conservative forces, these issues are resolved., Comment: 16 pages, 4 figures

Published
2015

8. Tunable perfect optical absorption in truncated photonic crystals with lossy defects

Author

Yan, Runze, Li, Junyang, Zhou, Haiyang, Zhao, Ying, Liu, Fen, Wu, Ailing, and Du, Guiqiang

Subjects
Materials Science (miscellaneous), Biophysics, General Physics and Astronomy, Physical and Theoretical Chemistry, Mathematical Physics
Abstract

We theoretically investigate tunable optical absorption properties of photonic crystals containing lossy materials as defects. It is found that a lossy defect can induce one or multiple perfect absorption peaks in the bandgap of photonic crystals and the number of the peaks mainly depends on the thickness of the defect layer. On the one hand, multiple complete absorption peaks can also emerge in the photonic bandgap when multiple lossy defects are inserted within the photonic crystals, and the resonant wavelengths of absorption peaks can be modulated by changing the distances among the defects. On the other hand, the optical absorption away from resonant wavelengths is nearly zero in the whole visible range. Such nanostructures can be used to engineer novel optical devices such as tunable single-channel and multi-channel perfect optical absorbers.

Published
2022

9. Subwavelength-Cavity High-Gain Circularly Polarized Antenna with Planar Metamaterials.

Author

Wang, Wei, Lu, Guang, Diao, Chao, Li, Junyang, Liu, Fen, and Du, Guiqiang

Subjects
PLANAR antennas, METAMATERIAL antennas, UNIT cell, CIRCULAR polarization, ANTENNA design, ANTENNAS (Electronics), METAMATERIALS
Abstract

We present a specific subwavelength-cavity high-gain circularly polarized ultra-thin antenna made of planar metamaterials. The antenna is designed to operate at 2.80 GHz with a fixed thickness of approximately 1/6 of the operating wavelength in free space. The asymmetric unit cells of the metamaterial antenna exhibit two characteristics, namely, negative permeability and polarization selection. A linear-polarization micro-strip patch, which can realize circular polarization without a complicated feeding network, is embedded in the cavity as a feed. The circular polarization mode of the antenna can be changed by simply rotating the planar metamaterial horizontally. Simulations and experiments conducted on this antenna yielded results that are in good agreement with each other. This new subwavelength planar antenna can have potentially important applications in communication, early warning systems, and radio observation. [ABSTRACT FROM AUTHOR]

Published
2023
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24. SOX17 Inhibits Tumor Metastasis Via Wnt Signaling In Endometrial Cancer

Author

Zhou, Weiqiang, Wang, Kai, Wang, Jingyun, Qu, Junjie, Du, Guiqiang, and Zhang, Yongli

Subjects
animal structures, embryonic structures, high-mobility group (HMG), SOX17, endometrial cancer (EC), migration, OncoTargets and Therapy, Original Research
Abstract

Weiqiang Zhou, Kai Wang, Jingyun Wang, Junjie Qu, Guiqiang Du, Yongli Zhang Department of Obstetrics and Gynecology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of ChinaCorrespondence: Yongli ZhangShanghai First Maternity and Infant Hospital, Tongji University School of Medicine, No. 2699 Gaokexi Road, Shanghai 201204, People’s Republic of ChinaTel +86-21-54035206Fax +86-21-54032482Email doctorzhang2@163.comBackground: Endometrial cancer (EC) is the most common gynecological malignancy with high incidence of metastasis, while the mechanism of metastasis in EC is not clear.Methods: Immunohistochemistry and real-time PCR assays were used to assess expression of SOX17 in paraffin-embedded tissues from EC patients and in EC cells. The migration of EC cells was assessed by wound-healing and Transwell assays as well as in an in vitro study of nude mice. In addition, the expression of specific proteins was analyzed by Western blot.Results: We observed that SOX17 expression levels were relatively high in stage I EC specimens, and were significantly correlated with the epithelial cadherin (E-cadherin) and β-catenin expression. Additionally, stage II EC patients whose specimens had relatively high SOX17 expression levels had better outcomes. Wound-healing and Transwell assays and in vivo murine experiments revealed that SOX17 inhibited EC cell migration. Meanwhile, SOX17 increased expression of E-cadherin and decreased expression of β-catenin and proteins in the Wnt signaling pathway. Moreover, LiCl (β-catenin activator) enhanced the regulatory effects of SOX17 on the expression of E-cadherin, promigratory cadherin, vimentin, and proteins in the Wnt signaling pathway, while XAV93920 (β-catenin inhibitor) exerted the opposite effect. The SOX17 N-terminus was proved to be necessary for these effects. Mechanistic investigations suggested SOX17 inhibits EC cell migration by inactivating the Wnt/β-catenin–epithelial mesenchymal transition (EMT) axis in EC cells.Conclusion: We uncovered a common SOX17–β-catenin–EMT mechanism underlying EC cell migration.Keywords: SOX17, endometrial cancer (EC), migration, high-mobility group (HMG)

Published
2019

25. TRIB3 suppresses proliferation and invasion and promotes apoptosis of endometrial cancer cells by regulating the AKT signaling pathway

Author

Qu, Junjie, Liu, Binya, Li, Bilan, Du, Guiqiang, Li, Yiran, Wang, Jingyun, He, Laman, and Wan, Xiaoping

Subjects
endometrial carcinomas, shRNA knockdown, endometrium, Drosophila tribbles homolog 3, OncoTargets and Therapy, Original Research, overexpression
Abstract

Junjie Qu,* Binya Liu,* Bilan Li, Guiqiang Du, Yiran Li, Jingyun Wang, Laman He, Xiaoping Wan Department of Gynaecology, Shanghai First Maternity and Infant Hospital, Tongji University, Shanghai 201204, China *These authors contributed equally to this work Objective: The aim of this study was to examine the effect of TRIB3 on proliferation, apoptosis, and migration of endometrial cancer (EC) cells and explore the relationship between TRIB3 and AKT signaling pathway in EC progression. Methods: Immunohistochemical analysis was performed to measure the expression level of TRIB3 in normal endometrium tissues and EC tissues. Overexpression and shRNA knockdown techniques were applied by transfecting EC cells (ISK and AN3CA), and the effect of TRIB3 on EC cell biological behaviors was evaluated. Cell Counting Kit-8 and colony formation assays were utilized to investigate EC cell proliferation ability, and flow cytometry was performed to assess the apoptosis of EC cells. Moreover, the migration and invasion of EC cells were detected by transwell assay, and the levels of MMP-2 and MMP-9 were measured by ELISA. Additionally, Western blot analysis was carried out to determine the levels of AKT and p-AKT. Results: The expression level of TRIB3 was higher in EC than normal endometrium tissues, and its overexpression promoted apoptosis and suppressed proliferation of EC cells. Furthermore, TRIB3 retarded the migration and invasion of EC cells and decreased the levels of MMP-2 and MMP-9. Conversely, TRIB3 inhibition enhanced the expression levels of MMP-2 and MMP-9, and proliferation and migration of EC cells but suppressed their apoptosis. Similarly, TRIB3 overexpression reduced while its knockdown increased the level of p-AKT. Conclusion: TRIB3 inhibited proliferation and migration and promoted apoptosis of EC cells probably through regulating AKT signaling pathway. Keywords: endometrial carcinomas, Drosophila tribbles homolog 3, endometrium, shRNA knockdown, overexpression

Published
2019

26. SOX17 Inhibits Tumor Metastasis Via Wnt Signaling In Endometrial Cancer

Author

Zhou,Weiqiang, Wang,Kai, Wang,Jingyun, Qu,Junjie, Du,Guiqiang, Zhang,Yongli, Zhou,Weiqiang, Wang,Kai, Wang,Jingyun, Qu,Junjie, Du,Guiqiang, and Zhang,Yongli

Abstract

Weiqiang Zhou, Kai Wang, Jingyun Wang, Junjie Qu, Guiqiang Du, Yongli Zhang Department of Obstetrics and Gynecology, Shanghai First Maternity and Infant Hospital, Tongji University School of Medicine, Shanghai, People’s Republic of ChinaCorrespondence: Yongli ZhangShanghai First Maternity and Infant Hospital, Tongji University School of Medicine, No. 2699 Gaokexi Road, Shanghai 201204, People’s Republic of ChinaTel +86-21-54035206Fax +86-21-54032482Email doctorzhang2@163.comBackground: Endometrial cancer (EC) is the most common gynecological malignancy with high incidence of metastasis, while the mechanism of metastasis in EC is not clear.Methods: Immunohistochemistry and real-time PCR assays were used to assess expression of SOX17 in paraffin-embedded tissues from EC patients and in EC cells. The migration of EC cells was assessed by wound-healing and Transwell assays as well as in an in vitro study of nude mice. In addition, the expression of specific proteins was analyzed by Western blot.Results: We observed that SOX17 expression levels were relatively high in stage I EC specimens, and were significantly correlated with the epithelial cadherin (E-cadherin) and β-catenin expression. Additionally, stage II EC patients whose specimens had relatively high SOX17 expression levels had better outcomes. Wound-healing and Transwell assays and in vivo murine experiments revealed that SOX17 inhibited EC cell migration. Meanwhile, SOX17 increased expression of E-cadherin and decreased expression of β-catenin and proteins in the Wnt signaling pathway. Moreover, LiCl (β-catenin activator) enhanced the regulatory effects of SOX17 on the expression of E-cadherin, promigratory cadherin, vimentin, and proteins in the Wnt signaling pathway, while XAV93920 (β-catenin inhibitor) exerted the opposite effect. The SOX17 N-terminus was proved to be necessary for these effects. Mechanistic investigations suggested SOX17 inhibits EC c

Published
2019

27. TRIB3 suppresses proliferation and invasion and promotes apoptosis of endometrial cancer cells by regulating the AKT signaling pathway

Author

Qu,Junjie, Liu,Binya, Li,Bilan, Du,Guiqiang, Li,Yiran, Wang,Jingyun, He,Laman, Wan,Xiaoping, Qu,Junjie, Liu,Binya, Li,Bilan, Du,Guiqiang, Li,Yiran, Wang,Jingyun, He,Laman, and Wan,Xiaoping

Abstract

Junjie Qu,* Binya Liu,* Bilan Li, Guiqiang Du, Yiran Li, Jingyun Wang, Laman He, Xiaoping Wan Department of Gynaecology, Shanghai First Maternity and Infant Hospital, Tongji University, Shanghai 201204, China *These authors contributed equally to this work Objective: The aim of this study was to examine the effect of TRIB3 on proliferation, apoptosis, and migration of endometrial cancer (EC) cells and explore the relationship between TRIB3 and AKT signaling pathway in EC progression. Methods: Immunohistochemical analysis was performed to measure the expression level of TRIB3 in normal endometrium tissues and EC tissues. Overexpression and shRNA knockdown techniques were applied by transfecting EC cells (ISK and AN3CA), and the effect of TRIB3 on EC cell biological behaviors was evaluated. Cell Counting Kit-8 and colony formation assays were utilized to investigate EC cell proliferation ability, and flow cytometry was performed to assess the apoptosis of EC cells. Moreover, the migration and invasion of EC cells were detected by transwell assay, and the levels of MMP-2 and MMP-9 were measured by ELISA. Additionally, Western blot analysis was carried out to determine the levels of AKT and p-AKT. Results: The expression level of TRIB3 was higher in EC than normal endometrium tissues, and its overexpression promoted apoptosis and suppressed proliferation of EC cells. Furthermore, TRIB3 retarded the migration and invasion of EC cells and decreased the levels of MMP-2 and MMP-9. Conversely, TRIB3 inhibition enhanced the expression levels of MMP-2 and MMP-9, and proliferation and migration of EC cells but suppressed their apoptosis. Similarly, TRIB3 overexpression reduced while its knockdown increased the level of p-AKT. Conclusion: TRIB3 inhibited proliferation and migration and promoted apoptosis of EC cells probably through regulating AKT signaling pathway. Keywords: endometrial carcinomas, Drosophila tribbles homolog 3, endometrium, shRNA knockdown, overexpression

Published
2019

36. Tailoring Optical Gradient Force and Optical Scattering and Absorption Force

Author

Du, Junjie, Yuen, Chi-Hong, Li, Xiao, Ding, Kun, Du, Guiqiang, Lin, Zhifang, Chan, Che Ting, Ng, Jack, Du, Junjie, Yuen, Chi-Hong, Li, Xiao, Ding, Kun, Du, Guiqiang, Lin, Zhifang, Chan, Che Ting, and Ng, Jack

Abstract

The introduction of the concept of gradient force and scattering and absorption force is an important milestone in optical trapping. However the profiles of these forces are usually unknown, even for standard setups. Here, we successfully calculated them analytically via multipole expansion and numerically via Mie theory and fast Fourier transform. The former provides physical insight, while the latter is highly accurate and efficient. A recipe to create truly conservative energy landscapes is presented. These may open up qualitatively new features in optical manipulation.

Published
2017

45. Calculating and Engineering the Optical Gradient and Scattering Force

Author

Du, Jun Jie, Yuen, Chi-Hong, Ding, Kun, Du, Guiqiang, Lin, Zhifang, Chan, Che Ting, Ng, Jack, Du, Jun Jie, Yuen, Chi-Hong, Ding, Kun, Du, Guiqiang, Lin, Zhifang, Chan, Che Ting, and Ng, Jack

Abstract

Optical gradient force and scattering force for experimentally accessible particle sizes are never calculated. We report an analytical and a numerical approach to calculate them. We also provide a recipe to eliminate the scattering force. © OSA 2015.

Published
2015

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