Search results for: Jinfeng Tian

Items from 1 to 20 out of 31 results

article

Improving the ablative performance of epoxy‐modified vinyl silicone rubber composites by incorporating different types of reinforcing fibers

Hao Zhang, Mingyan Huang, Yikai Xing, Jinfeng Tian, more

Polymer Composites > 45 > 5 > 4725 - 4742

In this study, ablative resistance of single fiber‐ and hybrid fiber‐reinforced epoxy‐modified vinyl silicone rubber (EMVSR) composites was systematically studied. Three types of fibers, namely aramid fiber (AF), basalt fiber (BF), and carbon fiber (CF), were employed as the reinforcements. The results indicated that the incorporation of fiber reinforcements effectively suppressed the expansion and...

article

Superior Low‐Temperature Reversible Adhesion Based on Bio‐Inspired Microfibrillar Adhesives Fabricated by Phenyl Containing Polydimethylsiloxane Elastomers

Shuang Xia, Yukun Chen, Jinfeng Tian, Jinfeng Shi, more

Advanced Functional Materials > 31 > 26 > n/a - n/a

Gecko‐inspired microfibrillar adhesives have achieved great progress in microstructure design and adhesion improvement over the past two decades. Space applications nowadays show great interest in this material for the characteristics of reversible adhesion and universal van der Waals interactions. However, the impact of harsh environment of space on the performance of microfibrillar adhesives, especially...

article

The contributions of climate change and production area expansion to drought risk for maize in China over the last four decades

Yanling Song, Jinfeng Tian, Hans W. Linderholm, Chunyi Wang, more

International Journal of Climatology > 41 > S1 > E2851 - E2862

Maize is one of China's most important crops and is profoundly sensitive to drought. Using weather and county‐level maize yield data, the drought risk for maize in China was estimated for the period 1971–2010. The results show that drought risk has increased in China over the last 40 years, and that areas experiencing moderate to high drought risk have expanded, particularly in Northeast China. The...

article

Low-Complexity Non-uniform Constellation Demapping Algorithm for Broadcasting System

Chen Wang, Fang Wang, Mingqi Li, Jinfeng Tian

International Journal of Electronics and Telecommunications > 2019 > Vol. 65, No. 3 > 413--420

This paper presents a novel low-complexity soft demapping algorithm for two-dimensional non-uniform spaced constellations (2D-NUCs) and massive order one-dimensional NUCs (1D-NUCs). NUCs have been implemented in a wide range of new broadcasting systems to approach the Shannon limit further, such as DVB-NGH, ATSC 3.0 and NGB-W. However, the soft demapping complexity is extreme due to the substantial...

chapter

An efficient channel estimation scheme of non-orthogonal multiple access system in 5G wireless networks

Xin Bian, Rongfang Song, Jinfeng Tian, Mingqi Li, more

2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC) > 1443 - 1447

2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC)

This paper presents an efficient channel estimation scheme of the non-orthogonal multiple access system which named CDMA-FMT in 5G wireless networks. The proposed channel estimation scheme is theoretically analyzed based on the equivalent sub-band channel model. Moreover, the simulation results show that, by using the proposed channel estimation scheme, the BLER performance of the CDMA-FMT system...

article

Development and evaluation of a multichannel endorectal RF coil for prostate MRI at 7T in combination with an external surface array

M. Arcan Ertürk, Jinfeng Tian, Pierre‐François Moortele, Gregor Adriany, more

Journal of Magnetic Resonance Imaging > 43 > 6 > 1279 - 1287

PurposeTo develop and evaluate a sterilizable multichannel endorectal coil (ERC) for use in combination with an external surface array (ESA) for high‐resolution anatomical and functional studies of the prostate at 7T. Materials and MethodsA two‐loop ERC (ERC‐2L) and a microstrip‐loop ERC (ERC‐ML) were compared at 7T in terms of transmit and receive performance. The best‐performing ERC was evaluated...

article

Distributing coil elements in three dimensions enhances parallel transmission multiband RF performance: A simulation study in the human brain at 7 Tesla

Xiaoping Wu, Jinfeng Tian, Sebastian Schmitter, J. Tommy Vaughan, more

Magnetic Resonance in Medicine > 75 > 6 > 2464 - 2472

PurposeWe explore the advantages of using a double‐ring radiofrequency (RF) array and slice orientation to design parallel transmission (pTx) multiband (MB) pulses for simultaneous multislice (SMS) imaging with whole‐brain coverage at 7 Tesla (T). MethodsA double‐ring head array with 16 elements split evenly in two rings stacked in the z‐direction was modeled and compared with two single‐ring arrays...

article

Comparison of RF body coils for MRI at 3 T: a simulation study using parallel transmission on various anatomical targets

Xiaoping Wu, Xiaotong Zhang, Jinfeng Tian, Sebastian Schmitter, more

NMR in Biomedicine > 28 > 10 > 1332 - 1344

The performance of multichannel transmit coil layouts and parallel transmission (pTx) RF pulse design was evaluated with respect to transmit B₁ (B₁ ⁺) homogeneity and specific absorption rate (SAR) at 3 T for a whole body coil. Five specific coils were modeled and compared: a 32‐rung birdcage body coil (driven either in a fixed quadrature mode or a two‐channel transmit mode), two single‐ring stripline...

chapter

Design considerations for dipole for head MRI at 10.5T

Jinfeng Tian, Russell L. Lagore, J. Thomas Vaughan

2015 IEEE MTT-S 2015 International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO) > 99 - 100

2015 IEEE MTT-S 2015 International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)

As the world's first 10.5T whole body human MRI scanner is ready for discoveries on new research frontiers, RF challenges need to be overcome to fully realize the benefits of the ultra-high MRI system. Dipole antennas were investigated with the Finite-Difference Time-Domain (FDTD) method. For best head MRI at 10.5T, results showed that dipole arrays should be long and conformal to the head geometry...

chapter

Vertex coloring based logical channel mapping for frequency hopping transmission in next generation broadcasting wireless systems

Fei Qu, Jinfeng Tian, Minqi Li, Xiaomin Mu

2015 10th International Conference on Communications and Networking in China (ChinaCom) > 670 - 674

2015 10th International Conference on Communications and Networking in China (ChinaCom)

Frequency hopping transmission of logical channel offers significant gains in capacity and coverage, while requires its mapped physical frames on different carrier frequencies separated at least in a tuning time interval when considering the receiver with a single tuner. This limitation on the mapped physical frames is similar to the graph coloring problem. Thus we innovatively model the problem in...

chapter

Banker's algorithm based resource allocation in next generation broadcasting wireless systems

Hongwei Wang, Jinfeng Tian, Mingqi Li, Weixin Mu, more

2015 10th International Conference on Communications and Networking in China (ChinaCom) > 687 - 691

2015 10th International Conference on Communications and Networking in China (ChinaCom)

This paper studies the resource allocation issue of multiple broadcast signals over multiple carrier frequencies in the next generation broadcasting wireless (NGB-W) system, each of which has specific transmission requirements on time resources and number of carrier frequencies. Based on the modified banker's algorithm, we propose a resource allocation approach of all broadcast signals in the NGB-W...

chapter

Reduction of physical layer signaling overhead in DVB-NGH systems

Weidong Wen, Jinfeng Tian, Mingqi Li, Guohui Li

2015 10th International Conference on Communications and Networking in China (ChinaCom) > 719 - 723

2015 10th International Conference on Communications and Networking in China (ChinaCom)

The Digital Video Broadcasting Next Generation Handheld (DVB-NGH) standard has adopted many advanced technologies, including overhead reduction schemes, to maximize the system capacity. However, some of the overhead reduction schemes of Layer-1 (L1) signaling result in increased initial capture time delays. In order to get a more flexible trade-off between overhead reduction and initial capture time...

chapter

Terrestrial broadcast technologies for next generation broadcast wireless systems

Yajun Kou, Fang Wang, Jinfeng Tian, Wenjun Zhang, more

2015 IEEE International Conference on Communication Workshop (ICCW) > 2578 - 2582

2015 ICC - 2015 IEEE International Conference on Communications Workshops (ICC)

The next generation broadcast wireless (NGB-W) system is aimed to provide high-speed, ubiquitous, and secure tri-play services to massive users. In this paper, a new terrestrial broadcast solution for the NGB-W system is proposed. The system and the key techniques of the proposed solution are introduced. The performance of the proposed solution is evaluated by simulations. It is shown that the performance...

article

In vivo radiofrequency heating in swine in a 3T (123.2‐MHz) birdcage whole body coil

Devashish Shrivastava, Lynn Utecht, Jinfeng Tian, John Hughes, more

Magnetic Resonance in Medicine > 72 > 4 > 1141 - 1150

PurposeTo study in vivo radiofrequency (RF) heating produced due to power deposition from a 3T (Larmour frequency = 123.2 MHz), birdcage, whole body coil. MethodsThe RF heating was simulated in a digital swine by solving the mechanistic generic bioheat transfer model (GBHTM) and the conventional, empirical Pennes bioheat transfer equation for two cases: 1) when the swine head was in the isocenter...

chapter

RF technology for human MRI at 10.5T

J. Thomas Vaughan, Lance DelaBarre, Jinfeng Tian, Sungmin Sohn, more

2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO) > 1 - 3

2013 IEEE MTT-S International Microwave Workshop Series on RF and Wireless Technologies for Biomedical and Healthcare Applications (IMWS-BIO)

The objective of this work is to develop and apply the world's highest field strength, whole-body MRI system for biomedical research of the human body in health, disease, and therapeutic intervention. Due to the better than linear proportion of signal-to-noise to field strength, this system has the inherent potential of being the most power instrument yet, for noninvasive investigation, In-vivo. However,...

chapter

Methods of time slicing and mapping for next generation broadcasting-wireless

Ying Yang, Xiangbin Yu, Jinfeng Tian, Yajun Kou, more

2013 IEEE Wireless Communications and Networking Conference Workshops (WCNCW) > 51 - 54

2013 IEEE Wireless Communications and Networking Conference Workshops (WCNCW)

In order to realize flexible time slicing in the Next Generation Broadcasting-Wireless (NGB-W) system, new time slicing scheme and the associated mapping scheme are proposed. The performance of the proposed time slicing scheme is evaluated by extensive simulations. Simulation results show that the performance of broadcasting systems with the proposed time slicing scheme is much better than that of...

article

Cyclostationarity-Based Decision Reporting Scheme for Cooperative Spectrum Sensing

Yonglei Jiang, Jinfeng Tian, Huaxia Chen, Honglin Hu

Wireless Personal Communications > 2013 > 68 > 3 > 697-710

Cooperative spectrum sensing has emerged as a promising solution to the hidden terminal problem in cognitive radio networks (CRNs). It could significantly promote the sensing capability of CRNs by exploiting space diversity gains in a fading environment. However, owing to the decision reporting overhead, there exists a tradeoff between the system throughput and performance of cooperative spectrum...

article

Spin echo functional MRI in bilateral auditory cortices at 7T: An application of B1 shimming

Federico De Martino, Sebastian Schmitter, Michelle Moerel, Jinfeng Tian, more

NeuroImage > 2012 > 63 > 3 > 1313-1320

Ultra high fields (UHF) permit unprecedented explorations of functional organizations and insight into basic neuronal processes. Increases in the signal and contrast to noise ratios have allowed increases in the spatial resolution of T ₂ ^⁎ weighted gradient echo (GE) echo planar imaging (EPI). Furthermore, while the use of T ₂ weighted imaging methods at UHF (e.g. spin echo (SE)...

article

Preparative isolation and purification of harpagoside and angroside C from the root of Scrophularia ningpoensis Hemsley by high‐speed counter‐current chromatography

Jinfeng Tian, Xiaoli Ye, Yuanhong Shang, Yafei Deng, more

Journal of Separation Science > 35 > 19 > 2659 - 2664

In this study, the bioactive component harpagoside and angroside C in the root of Scrophularia ningpoensis Hemsley was simultaneously separated by high‐speed counter‐current chromatography (HSCCC). A two‐phase solvent system containing chloroform/n‐butanol/methanol/water (4:1:3:2, v/v/v/v) was selected following consideration of the partition coefficient of the target compound. The crude extract (200...

article

Cyclostationarity-Based Frequency Synchronization for OFDM Systems Over Doubly-Selective Fading Channels

Jinfeng Tian, Yonglei Jiang, Honglin Hu

Wireless Personal Communications > 2012 > 66 > 2 > 461-472

Orthogonal frequency division multiplexing (OFDM) systems are highly sensitive to carrier frequency offset (CFO), especially in doubly-selective fading environment. Cyclostationarity-based blind synchronization methods are appealing in high-data-rate applications and low signal-to-noise regions. However, the cyclostationarity has not been exploited for frequency synchronization of OFDM systems under...

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INFONA - science communication portal

Search results for: Jinfeng Tian

Improving the ablative performance of epoxy‐modified vinyl silicone rubber composites by incorporating different types of reinforcing fibers

Superior Low‐Temperature Reversible Adhesion Based on Bio‐Inspired Microfibrillar Adhesives Fabricated by Phenyl Containing Polydimethylsiloxane Elastomers

The contributions of climate change and production area expansion to drought risk for maize in China over the last four decades

Low-Complexity Non-uniform Constellation Demapping Algorithm for Broadcasting System

An efficient channel estimation scheme of non-orthogonal multiple access system in 5G wireless networks

Development and evaluation of a multichannel endorectal RF coil for prostate MRI at 7T in combination with an external surface array

Distributing coil elements in three dimensions enhances parallel transmission multiband RF performance: A simulation study in the human brain at 7 Tesla

Comparison of RF body coils for MRI at 3 T: a simulation study using parallel transmission on various anatomical targets

Design considerations for dipole for head MRI at 10.5T

Vertex coloring based logical channel mapping for frequency hopping transmission in next generation broadcasting wireless systems

Banker's algorithm based resource allocation in next generation broadcasting wireless systems

Reduction of physical layer signaling overhead in DVB-NGH systems

Terrestrial broadcast technologies for next generation broadcast wireless systems

In vivo radiofrequency heating in swine in a 3T (123.2‐MHz) birdcage whole body coil

RF technology for human MRI at 10.5T

Methods of time slicing and mapping for next generation broadcasting-wireless

Cyclostationarity-Based Decision Reporting Scheme for Cooperative Spectrum Sensing

Spin echo functional MRI in bilateral auditory cortices at 7T: An application of B1 shimming

Preparative isolation and purification of harpagoside and angroside C from the root of Scrophularia ningpoensis Hemsley by high‐speed counter‐current chromatography

Cyclostationarity-Based Frequency Synchronization for OFDM Systems Over Doubly-Selective Fading Channels

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