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574 results on '"Liu, Yiliang"'

151. Is reducing new particle formation a plausible solution to mitigate particulate air pollution in Beijing and other Chinese megacities?

Author

Kulmala, Markku, primary, Dada, Lubna, additional, Daellenbach, Kaspar R., additional, Yan, Chao, additional, Stolzenburg, Dominik, additional, Kontkanen, Jenni, additional, Ezhova, Ekaterina, additional, Hakala, Simo, additional, Tuovinen, Saana, additional, Kokkonen, Tom V., additional, Kurppa, Mona, additional, Cai, Runlong, additional, Zhou, Ying, additional, Yin, Rujing, additional, Baalbaki, Rima, additional, Chan, Tommy, additional, Chu, Biwu, additional, Deng, Chenjuan, additional, Fu, Yueyun, additional, Ge, Maofa, additional, He, Hong, additional, Heikkinen, Liine, additional, Junninen, Heikki, additional, Liu, Yiliang, additional, Lu, Yiqun, additional, Nie, Wei, additional, Rusanen, Anton, additional, Vakkari, Ville, additional, Wang, Yonghong, additional, Yang, Gan, additional, Yao, Lei, additional, Zheng, Jun, additional, Kujansuu, Joni, additional, Kangasluoma, Juha, additional, Petäjä, Tuukka, additional, Paasonen, Pauli, additional, Järvi, Leena, additional, Worsnop, Douglas, additional, Ding, Aijun, additional, Liu, Yongchun, additional, Wang, Lin, additional, Jiang, Jingkun, additional, Bianchi, Federico, additional, and Kerminen, Veli-Matti, additional

Published
2021
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154. Artificial Noise Assisted MISO System-Power allocation and its SDR Implementation

Author

Fuchao Yan, Weixiao Meng, Liu Yiliang, and Shuai Han

Subjects
0203 mechanical engineering, Computer science, Modulation, 0202 electrical engineering, electronic engineering, information engineering, Bit error rate, Electronic engineering, Artificial noise, 020206 networking & telecommunications, 020302 automobile design & engineering, 02 engineering and technology, Software-defined radio, Power (physics)
Abstract

This paper mainly studies a multi-input single-output (MISO) system assisted by artificial noise (AN), and provides a system level implementation based on software-defined radio (SDR) for the AN-assisted MISO communications. Firstly, the paper studies the power allocation between the AN and the useful signals in a null-space-based AN scheme, and deduces the secrecy rate of this AN scheme. Then, we establish the system model of the AN-assisted MISO system under different modulation modes. Finally, a verification platform of the AN-assisted MISO system is built using nanoBEE software radio platform. The experimental results are in good agreement with the theoretical analysis and MATLAB simulations. The results also show that under the optimal power allocation strategy, the AN can effectively improve the secrecy rate of the system, but the secrecy rate is not affected by modulation modes. They just affect the bit error rate (BER) performance of the system.

Published
2019

158. Assessment of particle size magnifier inversion methods to obtain the particle size distribution from atmospheric measurements

Author

Chan, Tommy, primary, Cai, Runlong, additional, Ahonen, Lauri R., additional, Liu, Yiliang, additional, Zhou, Ying, additional, Vanhanen, Joonas, additional, Dada, Lubna, additional, Chao, Yan, additional, Liu, Yongchun, additional, Wang, Lin, additional, Kulmala, Markku, additional, and Kangasluoma, Juha, additional

Published
2020
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161. Continuous and comprehensive atmospheric observations in Beijing: a station to understand the complex urban atmospheric environment

Author

Liu, Yongchun, primary, Yan, Chao, additional, Feng, Zemin, additional, Zheng, Feixue, additional, Fan, Xiaolong, additional, Zhang, Yusheng, additional, Li, Chang, additional, Zhou, Ying, additional, Lin, Zhuohui, additional, Guo, Yishou, additional, Zhang, Ying, additional, Ma, Li, additional, Zhou, Wenshuo, additional, Liu, Zhikun, additional, Dada, Lubna, additional, Dällenbach, Kaspar, additional, Kontkanen, Jenni, additional, Cai, Runlong, additional, Chan, Tommy, additional, Chu, Biwu, additional, Du, Wei, additional, Yao, Lei, additional, Wang, Yonghong, additional, Cai, Jing, additional, Kangasluoma, Juha, additional, Kokkonen, Tom, additional, Kujansuu, Joni, additional, Rusanen, Anton, additional, Deng, Chenjuan, additional, Fu, Yueyun, additional, Yin, Rujing, additional, Li, Xiaoxiao, additional, Lu, Yiqun, additional, Liu, Yiliang, additional, Lian, Chaofan, additional, Yang, Dongsen, additional, Wang, Weigang, additional, Ge, Maofa, additional, Wang, Yuesi, additional, Worsnop, Douglas R., additional, Junninen, Heikki, additional, He, Hong, additional, Kerminen, Veli-Matti, additional, Zheng, Jun, additional, Wang, Lin, additional, Jiang, Jingkun, additional, Petäjä, Tuukka, additional, Bianchi, Federico, additional, and Kulmala, Markku, additional

Published
2020
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164. Variation of size-segregated particle number concentrations in wintertime Beijing

Author

Zhou, Ying, primary, Dada, Lubna, additional, Liu, Yiliang, additional, Fu, Yueyun, additional, Kangasluoma, Juha, additional, Chan, Tommy, additional, Yan, Chao, additional, Chu, Biwu, additional, Daellenbach, Kaspar R., additional, Bianchi, Federico, additional, Kokkonen, Tom V., additional, Liu, Yongchun, additional, Kujansuu, Joni, additional, Kerminen, Veli-Matti, additional, Petäjä, Tuukka, additional, Wang, Lin, additional, Jiang, Jingkun, additional, and Kulmala, Markku, additional

Published
2020
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165. Supplementary material to "Assessment of particle size magnifier inversion methods to obtain particle size distribution from atmospheric measurements"

Author

Chan, Tommy, primary, Cai, Runlong, additional, Ahonen, Lauri R., additional, Liu, Yiliang, additional, Zhou, Ying, additional, Vanhanen, Joonas, additional, Dada, Lubna, additional, Chao, Yan, additional, Liu, Yongchun, additional, Wang, Lin, additional, Kulmala, Markku, additional, and Kangasluoma, Juha, additional

Published
2020
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171. Suppression of breast cancer growth and metastasis by a serpin myoepithelium-derived proteinase inhibitor expressed in the mammary myoepithelial cells

Author

Xiao, Guowei, Liu, Yiliang E., Gentz, Reiner, Sang, Qingxiang A., Ni, Jian, Goldberg, Itzhak D., and Shi, Y. Eric

Subjects
Serine -- Research, Breast cancer -- Care and treatment, Enzyme inhibitors -- Research, Science and technology
Abstract

A serpin was identified in normal mammary gland by differential eDNA sequencing. In situ hybridization has detected this serpin exclusively in the myoepithelial cells on the normal and noninvasive mammary epithelial side of the basement membrane and thus was named myoepithelium-derived serine proteinase inhibitor (MEPI). No MEPI expression was detected in the malignant breast carcinomas. MEPI encodes a 405-aa precursor, including an 18-residue secretion signal with a calculated molecular mass of 46 kDa. The predicted sequence of the new protein shares 33% sequence identity and 58% sequence similarity to plasminogen activator inhibitor (PAI)-1 and PAI-2. To determine whether MEPI can modulate the in vivo growth and progression of human breast cancers, we transfected a full-length MEPI eDNA into human breast cancer cells and studied the orthotopic growth of MEPI-transfected vs. control clones in the mammary fat pad of athymic nude mice. Overexpression of MEPI inhibited the invasion of the cells in the in vitro invasion assay. When injected orthotopically into nude mice, the primary tumor volumes, axillary lymph node metastasis, and lung metastasis were significantly inhibited in MEPI-transfected clones as compared with controls. The expression of MEPI in myoepithelial cells may prevent breast cancer malignant progression leading to metastasis.

Published
1999

176. Influence of solid alkali application on corn stalk dissolution and degradation in solvent systems

Author

Le Liu, Xueju Huang, Weizun Li, Liu Yiliang, and Meiting Ju

Subjects
Materials science, Polymers and Plastics, Inorganic chemistry, food and beverages, Regenerated cellulose, Condensed Matter Physics, Microcrystalline cellulose, chemistry.chemical_compound, Crystallinity, chemistry, Chemical engineering, Mechanics of Materials, Materials Chemistry, Lignin, Hemicellulose, Cellulose, Fourier transform infrared spectroscopy, Dissolution
Abstract

In our study, solid alkali were produced and characterized by a series of methods. Dissolution of corn stalk was achieved in solvent systems at 170 °C for 5 h by cooking with solid alkali. The components of ionic liquid and water in solvent systems showed synergistic effects on lignocellulosic dissolution and degradation. Alkaline molecular sieves were proven to be the most effective solid alkali for lignin degradation, which promoted the dissolution efficiency of the corn stalk in solvent systems. Under the combined action of solid alkali and the nucleophilic component in solvent systems, lignin and hemicellulose in corn stalk were degraded. It effectively enhanced cellulose solubilization in solvent systems. The regenerated cellulose was demonstrated to be similar to microcrystalline cellulose according to Fourier Transform infrared spectroscopy and Nuclear Magnetic Resonance analyses. X-ray diffraction curves showed that the crystallinity of the regenerated cellulose is lower than that of microcrystalline cellulose.

Published
2015

177. A large aperture cryogenic lenses designed and verified for space-based infrared sensor

Author

Liu Yiliang, Pei Jingyang, Yang Tianyuan, Xing Mailing, and Hu Bin

Subjects
Materials science, Infrared, business.industry, Aperture, Astrophysics::Instrumentation and Methods for Astrophysics, Physics::Optics, Aerospace Engineering, Field of view, Encircled energy, Atomic and Molecular Physics, and Optics, law.invention, Vibration, Lens (optics), Entrance pupil, Optics, Operating temperature, Space and Planetary Science, law, Electrical and Electronic Engineering, business
Abstract

Telecentric and cryogenic optical system is a good solution to space-based IR sensor with wide field, sensitivity and determination of accurate orientation. A refractive telecentric optical system was designed with squared field of view in 8 degrees, entrance pupil of 265 millimeters and operating at 200 K. The aperture of the lens was 280 millimeters. By multilevel spring holders,the opto-mechanism got a available tradeoff between enough stiffness at room temperature and stress-free at 200 K, accordingly prevents thermal stress on lens and heat leakage from room temperature supports to cryogenic lens. After lenses alignment, vibration test and image test at operating temperature were performed. The ensquared energy reached 75% on axis and 72% off-axis respectively.

Published
2020

181. Variation of size-segregated particle number concentrations in winter Beijing

Author

Zhou, Ying, primary, Dada, Lubna, additional, Liu, Yiliang, additional, Fu, Yueyun, additional, Kangasluoma, Juha, additional, Chan, Tommy, additional, Yan, Chao, additional, Chu, Biwu, additional, Daellenbach, Kaspar R., additional, Bianchi, Federico, additional, Kokkonen, Tom, additional, Liu, Yongchun, additional, Kujansuu, Joni, additional, Kerminen, Veli-Matti, additional, Petäjä, Tuukka, additional, Wang, Lin, additional, Jiang, Jingkun, additional, and Kulmala, Markku, additional

Published
2019
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182. A proxy for atmospheric daytime gaseous sulfuric acid concentration in urban Beijing

Author

Lu, Yiqun, primary, Yan, Chao, additional, Fu, Yueyun, additional, Chen, Yan, additional, Liu, Yiliang, additional, Yang, Gan, additional, Wang, Yuwei, additional, Bianchi, Federico, additional, Chu, Biwu, additional, Zhou, Ying, additional, Yin, Rujing, additional, Baalbaki, Rima, additional, Garmash, Olga, additional, Deng, Chenjuan, additional, Wang, Weigang, additional, Liu, Yongchun, additional, Petäjä, Tuukka, additional, Kerminen, Veli-Matti, additional, Jiang, Jingkun, additional, Kulmala, Markku, additional, and Wang, Lin, additional

Published
2019
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186. Supplementary material to "A proxy for atmospheric daytime gaseous sulfuric acid concentration in urban Beijing"

Author

Lu, Yiqun, primary, Yan, Chao, additional, Fu, Yueyun, additional, Chen, Yan, additional, Liu, Yiliang, additional, Yang, Gan, additional, Wang, Yuwei, additional, Bianchi, Federico, additional, Chu, Biwu, additional, Zhou, Ying, additional, Yin, Rujing, additional, Baalbaki, Rima, additional, Garmash, Olga, additional, Deng, Chenjuan, additional, Wang, Weigang, additional, Liu, Yongchun, additional, Petäjä, Tuukka, additional, Kerminen, Veli-Matti, additional, Jiang, Jingkun, additional, Kulmala, Markku, additional, and Wang, Lin, additional

Published
2018
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187. A proxy for atmospheric daytime gaseous sulfuric acid concentration in urban Beijing

Author

Lu, Yiqun, primary, Yan, Chao, additional, Fu, Yueyun, additional, Chen, Yan, additional, Liu, Yiliang, additional, Yang, Gan, additional, Wang, Yuwei, additional, Bianchi, Federico, additional, Chu, Biwu, additional, Zhou, Ying, additional, Yin, Rujing, additional, Baalbaki, Rima, additional, Garmash, Olga, additional, Deng, Chenjuan, additional, Wang, Weigang, additional, Liu, Yongchun, additional, Petäjä, Tuukka, additional, Kerminen, Veli-Matti, additional, Jiang, Jingkun, additional, Kulmala, Markku, additional, and Wang, Lin, additional

Published
2018
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191. Measurements of Atmospheric HO2Radicals Using Br-CIMS with Elimination of Potential Interferences from Ambient Peroxynitric Acid

Author

Wang, Lihong, Wang, Yuwei, Yang, Gan, Li, Yueyang, Liu, Yiliang, Lu, Yiqun, Yao, Lei, and Wang, Lin

Abstract

As a promising direct measurement method of atmospheric hydroperoxyl radicals (HO2), bromide chemical ionization mass spectrometry (Br-CIMS) has been first demonstrated by Sanchez et al. (Atmos. Meas. Tech.2016, 9, 3851–3861). However, field application of this method is currently still sparse, and there is still a gap between measured HO2concentrations and calculated ones derived from the atmospheric equilibrium between HO2and peroxynitric acid (HO2NO2). In this work, we constructed an improved Br-CIMS with optimizations of custom-built front-end devices, chamber pressures, and instrumental voltages to achieve a 3σ detection limit of 0.5 ppt at an integration time of 60 s and a sensitivity of 1–3 cps ppt–1under a total reagent ion signal of 0.2 MHz for HO2detection. HO2NO2, a product from atmospheric reactions between HO2and NO2, can also be detected by Br-CIMS, whose interference on the HO2measurement was found but nearly eliminated by regulating key CIMS voltages to minimize the decomposition of (BrHO2NO2)−ions in the MS. In addition, a 2 week field campaign was carried out in urban Shanghai, demonstrating that the interference of HO2from ambient HO2NO2was less than 10% of the true HO2signal under our optimized CIMS voltage setting. Our study suggests that Br-CIMS is a reliable technique for atmospheric HO2measurements.

Published
2024
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192. End-to-end network collaboration in 5G networks.

Author

LIU Yiliang, LI Xin, and BO Kaitao

Abstract

The advent of 5G network era puts forward higher requirements for telecom operators' networks. The current situation, overall coordination framework and key capabilities of wireless access network, bearer network and core network in network slice were mainly described from the perspective of 5G end-to-end network coordination key technology, the actual case scenario of end-to-end slice was introduced, helping operators to successfully transform the network, one network multi-purpose was completed, network construction cost was reduced and differentiated service capacity was improved. [ABSTRACT FROM AUTHOR]

Published
2020
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198. Theoretical study of the geometries and dissociation energies of molecular water on neutral aluminum clusters Aln (n = 2-25).

Author

Liu, Yiliang, Hua, Yawen, Jiang, Ming, Jiang, Gang, and Chen, Jun

Subjects
*DISSOCIATION (Chemistry), *DENSITY functionals, *ISOMERS, *IONIZATION (Atomic physics), *ATOMS
Abstract

Geometries and dissociation energies of water molecules on Aln (n = 2-25) clusters were investigated using density functional theory with all electron relativistic spin-polarized calculations under the generalized gradient approximation. An extensive structure search was performed to identify the low-energy conformations of AlnH2O complexes for each size. Optimal adsorption sites were assigned for low-energy isomers of the clusters. Size and site specific dependences were studied for the AlnH2O complexes in stabilities, geometries, adsorption energies, dissociation energies, Al-O bond lengths, and other characteristic quantities. The stabilities and geometries revealed that H atom in H2O is not inclined to bond with Al atoms. The most stable AlnH2O configurations for each size tend to correspond to the most stable bare Aln cluster except of Al6 and Al24 clusters. The HO bond lengths increase generally 0.01 Å with respect to the isolated H2O in all of the adsorption complexes. The dissociation energy of an isolated H2O into HO and H was 5.39 eV, which decreased about two-thirds to the energy range of 0.83-2.12 eV with the help of Aln clusters. In spite of the fluctuations, the dissociation energies of AlnH2O complexes rise with the size increasing as a whole. In addition, we also found that the bare Aln clusters with high vertical ionization potentials usually have high dissociation energies of H2O in the corresponding adsorption models. The energetically preferred spin-multiplicity of all the odd-n AlnH2O complexes is doublet, and it is singlet for all the even-n complexes with exception of Al2H2O which is triplet. [ABSTRACT FROM AUTHOR]

Published
2012
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