20 results on '"Zhi-Fang Hu"'
Search Results
2. Geological characteristics and co-exploration and co-production methods of Upper Permian Longtan coal measure gas in Yangmeishu Syncline, Western Guizhou Province, China
- Author
-
Cai-qin Bi, Jia-qiang Zhang, Yan-sheng Shan, Zhi-fang Hu, Fu-guo Wang, Huan-peng Chi, Yue Tang, Yuan Yuan, and Ya-ran Liu
- Subjects
Coal measure gas ,Reservoir characteristics ,Favorable interval optimization ,Reservoir fracturing reconstruction ,Coal measures “three gas” drainage ,Oil and gas exploration enginerreing ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Geology ,QE1-996.5 - Abstract
ABSTRACT: Coal measure gas (also known as coal-bearing unconventional gas) is the key field and development direction of unconventional natural gas in recent years. The exploration and evaluation of coal measure gas (coalbed methane, coal shale gas and coal measure tight sandstone gas) from single coalbed methane has greatly expanded the field and space of resource evaluation, which is of positive significance for realizing the comprehensive utilization of coal resources, maximizing the benefits and promoting the innovation of oil and gas geological theory and technological advances in exploration and development. For the first time, in Yangmeishu Syncline of Western Guizhou Province, the public welfare coalbed methane geological survey project of China Geological Survey has been carried out a systematic geological survey of coal measure gas for the Upper Permian Longtan Formation, identified the geological conditions of coal measure gas and found high quality resources. The total geological resource quantity of coalbed methane and coal shale gas is 51.423×109 m3 and the geological resource abundance is up to 566×109 m3/km2. In this area, the coal measures are characterized by many layers of minable coal seams, large total thickness, thin to the medium thickness of the single layer, good gas-bearing property of coal seams and coal measure mudstone and sandstone, good reservoir physical property and high-pressure coefficient. According to the principle of combination of high quality and similarity of key parameters of the coal reservoir, the most favorable intervals are No.5−2, No.7 and No.13−2 coal seam in Well YMC1. And the pilot tests are carried out on coal seams and roof silty mudstone, such as staged perforation, increasing hydraulic fracturing scale and “three gas” production. The high and stable industrial gas flow with a daily gas output of more than 4000 m3 has been obtained, which has realized the breakthrough in the geological survey of coal measure gas in Southwest China. Based on the above investigation results, the geological characteristics of coal measure gas in the multi-thin-coal-seam-developed area and the co-exploration and co-production methods, such as the optimization method of favorable intervals, the high-efficiency fracturing and reservoir reconstruction method of coal measures, and the “three gas” drainage and production system, are systematically summarized in this paper. It will provide a reference for efficient exploration and development of coal measure gas in similar geological conditions in China.
- Published
- 2020
- Full Text
- View/download PDF
3. A review and research on comprehensive characterization of microscopic shale gas reservoir space
- Author
-
Yu-ru Yang, Xiao-chen Liu, Hui Zhang, Gang-yi Zhai, Jiao-dong Zhang, Zhi-fang Hu, Shu-jing Bao, Cong Zhang, Xiang-hua Wang, Xiao Yang, Zheng-zhuang Liu, Ting Xie, Juan Chen, Liyu Fang, and Li-juan Qin
- Subjects
Shale ,Shale gas ,Reservoir space ,Research status ,Types of pore combinations ,Oil-gas exploration engineering ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Geology ,QE1-996.5 - Abstract
ABSTRACT: In this paper, substantial domestic and foreign research results of microscopic shale reservoir space were systemically reviewed, the research history consisting of simple observation and qualitative classification, quantitative research, the combination of qualitative and quantitative research successively as well as the characteristics of each research stage were summarized. In addition, the current problems existing in the characterization methods of shale reservoir space were also analyzed. Furthermore, based on massive actual detection of typical core samples obtained from more than 50 global shale gas wells and relevant practical experience, a comprehensive characterization method of combining qualitative with the semi-quantitative characterization was put forward. In detail, the indicators of the qualitative characterization include pore combination type and organic-matter microscopic morphology type, while the core elements of the semi-quantitative characterization include the percentage of the organic-matter area and the plane porosity of the pores of different types. Based on the reference of the naming and classification of rocks, the three-end-member diagram method was used to characterize microscopic shale reservoir space. This is achieved by plotting the three end-member diagram of 3 kinds of first-order critical reservoir spaces, i.e., organic-matter pores, matrix pores, and micro-fractures, in order to intuitively present the features of the microscopic pore combination. Meanwhile, statistic histograms of organic-matter microscopic morphology type and the plane porosity of different types of pores were adopted to characterize the development degree of second-order pores quantitatively. By this comprehensive characterization method, the importance of both pore combination and the microscopic morphology of organic matter were emphasized, revealing the control of organic-matter microscopic morphology over the organic-matter pores. What is more, high-resolution FE-SEM was adopted to obtain semi-quantitative statistics results. In this way, the features of pore development and pore combination were quantified, not only reflecting the types and storage capacity of the microscopic shale reservoir space, but also presenting the hydrocarbon-generating potential of organic matter in shale. Therefore, the results of this research are capable of providing in-depth microscopic information for the assessment and exploration and development of shale gas resources.
- Published
- 2019
- Full Text
- View/download PDF
4. A review and research on comprehensive characterization of microscopic shale gas reservoir space
- Author
-
Cong Zhang, Shu-jing Bao, Hui Zhang, Sgs-Cstc Standards Technical Services Co., Ltd., Beijing , China, Li-yu Fang, Ting Xie, Juan Chen, Jiao-dong Zhang, Zheng-zhuang Liu, Xiao Yang, Zhi-fang Hu, Liu Xiaochen, Wang Xianghua, Gang-yi Zhai, Li-juan Qin, and Yu-ru Yang
- Subjects
Shale gas ,Plane (geometry) ,Paleontology ,Mineralogy ,Geology ,Geotechnical Engineering and Engineering Geology ,Oceanography ,Space (mathematics) ,Matrix (geology) ,Characterization (materials science) ,Characterization methods ,Geochemistry and Petrology ,Economic Geology ,Computers in Earth Sciences ,Porosity ,Oil shale ,Earth-Surface Processes - Abstract
In this paper, substantial domestic and foreign research results of microscopic shale reservoir space were systemically reviewed, the research history consisting of simple observation and qualitative classification, quantitative research, the combination of qualitative and quantitative research successively as well as the characteristics of each research stage were summarized. In addition, the current problems existing in the characterization methods of shale reservoir space were also analyzed. Furthermore, based on massive actual detection of typical core samples obtained from more than 50 global shale gas wells and relevant practical experience, a comprehensive characterization method of combining qualitative with the semi-quantitative characterization was put forward. In detail, the indicators of the qualitative characterization include pore combination type and organic-matter microscopic morphology type, while the core elements of the semi-quantitative characterization include the percentage of the organic-matter area and the plane porosity of the pores of different types. Based on the reference of the naming and classification of rocks, the three-end-member diagram method was used to characterize microscopic shale reservoir space. This is achieved by plotting the three end-member diagram of 3 kinds of first-order critical reservoir spaces, i.e., organic-matter pores, matrix pores, and micro-fractures, in order to intuitively present the features of the microscopic pore combination. Meanwhile, statistic histograms of organic-matter microscopic morphology type and the plane porosity of different types of pores were adopted to characterize the development degree of second-order pores quantitatively. By this comprehensive characterization method, the importance of both pore combination and the microscopic morphology of organic matter were emphasized, revealing the control of organic-matter microscopic morphology over the organic-matter pores. What is more, high-resolution FE-SEM was adopted to obtain semi-quantitative statistics results. In this way, the features of pore development and pore combination were quantified, not only reflecting the types and storage capacity of the microscopic shale reservoir space, but also presenting the hydrocarbon-generating potential of organic matter in shale. Therefore, the results of this research are capable of providing in-depth microscopic information for the assessment and exploration and development of shale gas resources.
- Published
- 2019
- Full Text
- View/download PDF
5. Untargeted urine metabolomics and machine learning provide potential metabolic signatures in children with autism spectrum disorder
- Author
-
Xian Liu, Xin Sun, Cheng Guo, Zhi-Fang Huang, Yi-Ru Chen, Fang-Mei Feng, Li-Jie Wu, and Wen-Xiong Chen
- Subjects
autism ,untargeted metabolomics ,machine learning ,urine ,screen ,Psychiatry ,RC435-571 - Abstract
BackgroundComplementary to traditional biostatistics, the integration of untargeted urine metabolomic profiling with Machine Learning (ML) has the potential to unveil metabolic profiles crucial for understanding diseases. However, the application of this approach in autism remains underexplored. Our objective was to delve into the metabolic profiles of autism utilizing a comprehensive untargeted metabolomics platform coupled with ML.MethodsUntargeted metabolomics quantification (UHPLC/Q-TOF-MS) was performed for urine analysis. Feature selection was conducted using Lasso regression, and logistic regression, support vector machine, random forest, and extreme gradient boosting were utilized for significance stratification. Pathway enrichment analysis was performed to identify metabolic pathways associated with autismResultsA total of 52 autistic children and 40 typically developing children were enrolled. Lasso regression identified ninety-two urinary metabolites that significantly differed between the two groups. Distinct metabolites, such as prostaglandin E2, phosphonic acid, lysine, threonine, and phenylalanine, were revealed to be associated with autism through the application of four different ML methods (p
- Published
- 2024
- Full Text
- View/download PDF
6. An axial-ratio beamwidth enhancement of patch antenna with digonal slot and square ring
- Author
-
Xiao Hong Zhang, Bo Yuan, Guo Qing Luo, and Zhi Fang Hu
- Subjects
Patch antenna ,Materials science ,Fan-beam antenna ,Coaxial antenna ,business.industry ,020208 electrical & electronic engineering ,Antenna measurement ,020206 networking & telecommunications ,Slot antenna ,02 engineering and technology ,Antenna factor ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Antenna efficiency ,Microstrip antenna ,Optics ,0202 electrical engineering, electronic engineering, information engineering ,Electrical and Electronic Engineering ,business ,Computer Science::Information Theory - Abstract
A novel circularly polarized (CP) antenna with wide angular coverage is presented. The proposed antenna is formed by a 45 ° slot cut in the center of a rectangular patch antenna and a square ring around it. It can achieve an impedance bandwidth of 110 MHz and a 3 dB axial ratio bandwidth of 25 MHz. For this design, very stable and symmetrical radiation patterns are obtained. The 3 dB axial ratio beamwidth for the antenna is 160 °, compared with the antenna that without the metal square ring, the antenna with square ring has 19 ° more 3 dB axial ratio beamwidth. This antenna has been successfully applied on passive keyless entry system on door lock. © 2016 Wiley Periodicals, Inc. Microwave Opt Technol Lett 58:672–675, 2016
- Published
- 2016
- Full Text
- View/download PDF
7. Changes in marine productivity and redox conditions during the Late Ordovician Hirnantian glaciation
- Author
-
Jun Shen, Lian Zhou, Junhua Huang, Zhi-Fang Hu, Thomas J. Algeo, Shucheng Xie, Shan Gao, and Hongmei Gong
- Subjects
Total organic carbon ,Extinction event ,Paleontology ,Oceanography ,Calcirudite ,Turbidite ,Katian ,Ordovician ,Glacial period ,Ecology, Evolution, Behavior and Systematics ,Geology ,Earth-Surface Processes ,Marine transgression - Abstract
Changes in marine productivity and redox conditions during the end-Ordovician (Hirnantian) glaciation and Ordovician–Silurian transition were investigated through Mo-isotope and major- and trace-element analyses of the Wangjiawan (Hubei Province) and Nanbazi (Guizhou Province) sections from the Yangtze Platform of South China. Katian shales of the Wufeng Formation, which yield the graptolites Dicellograptus complanatus , Dicellograptus complexus , and Paraorthograptus pacificus , were deposited under euxinic conditions at both localities, as shown by high Mo EF , U EF , and δ 98 Mo values. A major sea-level regression during the Hirnantian glaciation resulted in shallowing and a shift toward better-oxygenated conditions within the Yangtze Sea, as well as deposition of thin-bedded siliceous sediments, calcirudite debris flows, and limestone turbidites of the Kuanyinchiao Formation, the base of which correlates with the first phase of the end-Ordovician mass extinction. The termination of the Hirnantian glaciation at the top of the Kuanyinchiao Formation was associated with a major sea-level transgression, a rapid expansion of euxinia in the Yangtze Sea (as documented by a return of high Mo EF , U EF , and δ 98 Mo values), and the second phase of the mass extinction, during which the cool-adapted Hirnantian Fauna went extinct. The long-term cooling trend of the Middle and Late Ordovician, which culminated in the Hirnantian glaciation, was driven by enhanced burial of organic carbon, as documented by δ 13 C carb , δ 13 C org , and δ 34 S py records. Increased organic carbon burial was linked to high rates of marine productivity, as shown by high TOC and biogenic Ba concentrations especially at the deeper, less-restricted Wangjiawan locale, producing the HICE (Hirnantian Isotopic Curve Excursion) δ 13 C carb excursion. The locus of organic carbon burial during the Hirnantian crisis shifted to deeper-water environments that were located outside the study region. The relatively rapid onset and termination of the Hirnantian glaciation were probably due to crossing of tipping points in the Late Ordovician climatic–oceanic system.
- Published
- 2015
- Full Text
- View/download PDF
8. De novo mutations within metabolism networks of amino acid/protein/energy in Chinese autistic children with intellectual disability
- Author
-
Wen-Xiong Chen, Bin Liu, Lijie Zhou, Xiaoli Xiong, Jie Fu, Zhi-Fang Huang, Ting Tan, Mingxi Tang, Jun Wang, and Ya-Ping Tang
- Subjects
Autism spectrum disorder ,Whole-exome sequencing ,De novo mutations ,Pathways ,Intellectual disability ,Intelligence quotient ,Medicine ,Genetics ,QH426-470 - Abstract
Abstract Background Autism spectrum disorder (ASD) is often accompanied by intellectual disability (ID). Despite extensive studies, however, the genetic basis for this comorbidity is still not clear. In this study, we tried to develop an analyzing pipeline for de novo mutations and possible pathways related to ID phenotype in ASD. Whole-exome sequencing (WES) was performed to screen de novo mutations and candidate genes in 79 ASD children together with their parents (trios). The de novo altering genes and relative pathways which were associated with ID phenotype were analyzed. The connection nodes (genes) of above pathways were selected, and the diagnostic value of these selected genes for ID phenotype in the study population was also evaluated. Results We identified 89 de novo mutant genes, of which 34 genes were previously reported to be associated with ASD, including double hits in the EGF repeats of NOTCH1 gene (p.V999M and p.S1027L). Interestingly, of these 34 genes, 22 may directly affect intelligence quotient (IQ). Further analyses revealed that these IQ-related genes were enriched in protein synthesis, energy metabolism, and amino acid metabolism, and at least 9 genes (CACNA1A, ALG9, PALM2, MGAT4A, PCK2, PLEKHA1, PSME3, ADI1, and TLE3) were involved in all these three pathways. Seven patients who harbored these gene mutations showed a high prevalence of a low IQ score (
- Published
- 2022
- Full Text
- View/download PDF
9. Bandwidth-Enhanced Low-Profile Cavity-Backed Slot Antenna by Using Hybrid SIW Cavity Modes
- Author
-
Xiao Hong Zhang, Jianfeng Zheng, Ling Ling Sun, Zhi Fang Hu, Guo Qing Luo, and Wen Jun Li
- Subjects
Planar ,Optics ,Fabrication ,Front-to-back ratio ,Materials science ,business.industry ,Bandwidth (signal processing) ,Slot antenna ,Electrical and Electronic Engineering ,business ,Electrical impedance ,Antenna efficiency ,Electronic circuit - Abstract
A bandwidth enhanced method of a low-profile substrate integrated waveguide (SIW) cavity-backed slot antenna is presented in this paper. Bandwidth enhancement is achieved by simultaneously exciting two hybrid modes in the SIW-backed cavity and merging them within the required frequency range. These two hybrid modes, whose dominant fields are located in different half parts of the SIW cavity, are two different combinations of the and resonances. This design method has been validated by experiments. Compared with those of a previously presented SIW cavity-backed slot antenna, fractional impedance bandwidth of the proposed antenna is enhanced from 1.4% to 6.3%, its gain and radiation efficiency are also slightly improved to 6.0 dBi and 90%, and its SIW cavity size is reduced about 30%. The proposed antenna exhibits low cross polarization level and high front to back ratio. It still retains advantages of low-profile, low fabrication cost, and easy integration with planar circuits.
- Published
- 2012
- Full Text
- View/download PDF
10. Development of Low Profile Cavity Backed Crossed Slot Antennas for Planar Integration
- Author
-
Yaping Liang, Zhi Fang Hu, Ling Ling Sun, Guo Qing Luo, and Li Yang Yu
- Subjects
Waveguide (electromagnetism) ,Optics ,Materials science ,business.industry ,Linear polarization ,Coplanar waveguide ,Optical polarization ,Slot antenna ,Electrical and Electronic Engineering ,Antenna gain ,Antenna (radio) ,business ,Circular polarization - Abstract
Single fed low profile cavity backed crossed slot antennas for dual frequency dual linear polarization and circular polarization applications are first presented in this paper. By employing the substrate integrated waveguide (SIW) technique in the antenna designs, the low profile backed cavity structure can be realized by using only a single layer of low cost printed circuit board (PCB) substrate. A single grounded coplanar waveguide (GCPW) is employed as the feeding element to excite the TE 120 and TE 210 modes in the SIW cavity. A crossed slot structure is used as the radiating element in order to radiate the desired dual linearly or circularly polarized wave. From the measurement results, it is seen that these novel antennas retain the advantages of conventional metallic cavity backed antennas, including high gain, high front-to-back ratio (FTBR), and low cross polarization level (CPL). Furthermore, the proposed antennas also possess the advantages of low profile, light weight, low fabrication cost, and easy integration with planar circuits.
- Published
- 2009
- Full Text
- View/download PDF
11. Planar Slot Antenna Backed by Substrate Integrated Waveguide Cavity
- Author
-
Lin Xi Dong, Guo Qing Luo, Ling Ling Sun, and Zhi Fang Hu
- Subjects
Patch antenna ,Materials science ,Coaxial antenna ,business.industry ,Antenna measurement ,Slot antenna ,Antenna factor ,Radiation pattern ,Antenna efficiency ,Microstrip antenna ,Optics ,Optoelectronics ,Electrical and Electronic Engineering ,business - Abstract
A novel design method of low profile cavity backed planar slot antenna has been described in this paper. The whole antenna including backed cavity and feeding element is completely constructed at a single substrate by using substrate integrated waveguide technique and grounded coplanar waveguide. An example with 1.7% bandwidth has been presented, which has 5.4 dBi gain, 16.1 dB front-to-back ratio and -19 dB maximum cross polarized radiation level with its total thickness less than lambda0/50. The proposed antenna keeps good radiation performance of conventional cavity backed antenna and has advantages of conventional planar antenna including low profile, light weight, easy fabrication with low cost and convenient integration with planar circuit.
- Published
- 2008
- Full Text
- View/download PDF
12. Design of a 60GHz Antenna-on-chip with cross-shape Artificial Magnetic Conductor
- Author
-
Xiao Hong Zhang, Guo Qing Luo, Xiu Zhi Liao, Bo Yuan, and Zhi Fang Hu
- Subjects
Patch antenna ,Engineering ,CMOS ,business.industry ,Shield ,Electrical engineering ,Optoelectronics ,Substrate (electronics) ,Antenna (radio) ,Wideband ,business ,Electrical conductor ,Conductor - Abstract
A 60GHz patch monopole Antenna-on-chip (AoC) with a cross-shape Artificial Magnetic Conductor (AMC) is presented based on standard 0.18um CMOS process. The novel cross-shape AMC acts as a shield between the radiating element and the lossy silicon substrate. Both AMC and the patch antenna are optimized to achieve a wideband operating performance covering 57–66 GHz. The optimized AoC has a compact size of 0.9×2.1mm2 and provide a high gain of 1.53 dBi.
- Published
- 2015
- Full Text
- View/download PDF
13. A circular ring-shape monopole on-chip antenna with artificial magnetic conductor
- Author
-
Hao Tian Huang, Zhi Fang Hu, Bo Yuan, Xiao Hong Zhang, and Guo Qing Luo
- Subjects
Physics ,Coaxial antenna ,business.industry ,Electrical engineering ,Radiation pattern ,Antenna efficiency ,law.invention ,Computer Science::Hardware Architecture ,Optics ,law ,J-pole antenna ,Helical antenna ,Dipole antenna ,Antenna (radio) ,business ,Monopole antenna ,Computer Science::Information Theory - Abstract
A wideband 60GHz monopole on-chip antenna based on 0.18μm CMOS process with an artificial magnetic conductor (AMC) is presented. The structure of the proposed on-chip antenna consists of a circular ring-shaped monopole antenna fed by a 50Ω coplanar waveguide (CPW). Results show that the proposed circular ring-shaped monopole antenna mounted on AMC plane can offer higher gain, higher radiation efficiency and wider impedance bandwidth, while has a smaller antenna size.
- Published
- 2015
- Full Text
- View/download PDF
14. Variation of molybdenum isotopes in molybdenite from porphyry and vein Mo deposits in the Gangdese metallogenic belt, Tibetan plateau and its implications
- Author
-
Zhaochu Hu, Yong Wang, Lu Yang, Lian Zhou, Shan Gao, Zhi-Fang Hu, and Jian-Wei Li
- Subjects
geography ,Plateau ,geography.geographical_feature_category ,010504 meteorology & atmospheric sciences ,Isotope ,Geochemistry ,chemistry.chemical_element ,010502 geochemistry & geophysics ,01 natural sciences ,Mineral resource classification ,Molybdenum isotope ,Geophysics ,chemistry ,Geochemistry and Petrology ,Molybdenum ,Molybdenite ,Tibetan Plateau ,Economic Geology ,Vein (geology) ,Geology ,0105 earth and related environmental sciences ,Gangdese - Abstract
We present Mo isotopic ratios of molybdenite from five porphyry molybdenum deposits (Chagele, Sharang, Jiru, Qulong, and Zhuonuo) and one quartz-molybdenite vein-type deposit (Jigongcun) along the Gangdese metallogenic belt in the Tibetan Plateau. These deposits represent a sequence of consecutive events of the India-Asia collision at different periods. Additional molybdenite samples from the Henderson Mo deposit (USA), the oceanic subduction-related El Teniente (Chile), and Bingham (USA) porphyry Cu-(Mo) deposits were analyzed for better understanding the controls on the Mo isotope systematics of molybdenite. The results show that molybdenite from Sharang, Jiru, Qulong, and Zhuonuo deposits have similar δ97Mo (∼0 ‰), in agreement with the values of the Henderson Mo deposit (−0.10 ‰). In contrast, samples from the Changle and Jigongcun deposit have δ97Mo of 0.85 ‰ to 0.88 ‰ and −0.48 %, respectively. Molybdenite from the El Teniente and Bingham deposits yields intermediate δ97Mo of 0.27 and 0.46 ‰, respectively. The Mo isotopes, combined with Nd isotope data of the ore-bearing porphyries, indicate that source of the ore-related magmas has fundamental effects on the Mo isotopic compositions of molybdenite. Our study indicates that molybdenite related to crustal-, and mantle-derived magmas has positive or negative δ97Mo values, respectively, whereas molybdenite from porphyries formed by crust-mantle mixing has δ97Mo close to 0 ‰. It is concluded that the Mo isotope composition in the porphyry system is a huge source signature, without relation to the tectonic setting under which the porphyry deposits formed.
- Published
- 2015
15. Slotted patch antennas with wide axial ratio beamwidth for passive keyless entry system
- Author
-
Xiao Hong Zhang, Guo Qing Luo, Zhi Fang Hu, and Bo Yuan
- Subjects
Patch antenna ,Beamwidth ,Microstrip antenna ,Optics ,Materials science ,Directional antenna ,business.industry ,Axial ratio ,Slot antenna ,business ,Microstrip ,Square (algebra) - Abstract
The design of circularly polarized microstrip patch antenna (MPA) with wide axial ratio beamwidth working at 2.4GHz band is proposed. The wide axial ratio beamwidth is achieved by a 45° rotated slot cut in the center of the square MPA. By placing two back-to-back MPAs on intelligent door lock, the function of indoor-outdoor recognition has been successfully realized.
- Published
- 2015
- Full Text
- View/download PDF
16. A T-junction power divider FED circularly polarized cavity backed slot antenna
- Author
-
Lin Xi Dong, Ling Ling Sun, Zhi Fang Hu, Xiao Hong Zhang, and Guo Qing Luo
- Subjects
Phase difference ,Waveguide (electromagnetism) ,Engineering ,business.industry ,Electrical engineering ,Slot antenna ,Substrate (electronics) ,Condensed Matter Physics ,Atomic and Molecular Physics, and Optics ,Electronic, Optical and Magnetic Materials ,Optics ,Power dividers and directional couplers ,Electrical and Electronic Engineering ,business ,Microwave ,Circularly polarized radiation ,T junction - Abstract
A circularly polarized antenna realized by a power divider fed cavity backed slot antenna is presented in this article.The cavity backed slot antenna is constructed on a single layer substrate by using substrate integrated waveguide (SIW) technique. A T-junction power divider with equal magnitude and 90° phase difference outputs is adopted as the parallel feed to excite the SIW backed cavity. Circularly polarized radiation can be generated when two orthogonal cavity modes are excited simultaneously in the backed cavity. © 2011 Wiley Periodicals, Inc. Microwave Opt Technol Lett 54:107–109, 2012; View this article online at wileyonlinelibrary.com. DOI 10.1002/mop.26482
- Published
- 2011
- Full Text
- View/download PDF
17. Significance of aberrant Pim-3 expression in gastric carcinoma
- Author
-
Yuan Huang, Qiong Zhong, Zhi-Fang Hu, and Jie Jian
- Subjects
Expression (architecture) ,Cancer research ,Gastric carcinoma ,Biology - Published
- 2008
- Full Text
- View/download PDF
18. Effects of ginsenoside Rg3 on the expression of Pim-3 and Bad in human hepatocarcinoma cell lines
- Author
-
Dao Wang, Yuan Huang, Jie Jian, Xiao-Yan Li, Li-zhen Liu, and Zhi-Fang Hu
- Subjects
chemistry.chemical_compound ,chemistry ,Ginsenoside ,Cell culture ,Cancer research - Published
- 2008
- Full Text
- View/download PDF
19. Development of Low Profile Cavity Backed Crossed Slot Antennas for Planar Integration.
- Author
-
Guo Qing Luo, Zhi Fang Hu, Yaping Liang, Li Yang Yu, and Ling Ling Sun
- Subjects
- *
ANTENNAS (Electronics) , *POLARIZATION (Electricity) , *WAVEGUIDES , *PRINTED circuits , *ELECTRONIC equipment - Abstract
Single fed low profile cavity backed crossed slot antennas for dual frequency dual linear polarization and circular polarization applications are first presented in this paper. By employing the substrate integrated waveguide (SIW) technique in the antenna designs, the low profile backed cavity structure can be realized by using only a single layer of low cost printed circuit board (PCB) substrate. A single grounded coplanar waveguide (GCPW) is employed as the feeding element to excite the TE120 and TE210 modes in the SIW cavity. A crossed slot structure is used as the radiating element in order to radiate the desired dual linearly or circularly polarized wave. From the measurement results, it is seen that these novel antennas retain the advantages of conventional metallic cavity backed antennas, including high gain, high front-toback ratio (FTBR), and low cross polarization level (CPL). Furthermore, the proposed antennas also possess the advantages of low profile, light weight, low fabrication cost, and easy integration with planar circuits. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
20. All-fiber Fabry-Perot resonators based on microfiber Sagnac loop mirrors.
- Author
-
Shan-Shan Wang, Zhi-Fang Hu, Yu-Hang Li, and Li-Min Tong
- Published
- 2009
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.