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| 1 | Approach to blind estimation of the PN sequence in DS-SS signals with residual carrier显示文摘This paper presents an approach of singular value decomposition plus digital phase lock loop to solve the difficult problem of blind pseudo-noise (PN) sequence estimation in low signal to noise ratios (SNR) direct sequence spread spectrum (DS-SS) signals with residual carrier. This approach needs some given parameters, such as the period and code rate of PN sequence. The received signal is firstly sampled and divided into non-overlapping signal vectors according to a temporal window, whose duration is two periods of PN sequence. An autocorrelation matrix is then computed and accumulated by those signal vectors one by one. The PN sequence with residual carrier can be estimated by the principal eigenvector of the autocorrelation matrix. Further more, a digital phase lock loop is used to process the estimated PN sequence, it estimates and tracks the residual carrier and removes the residual carrier in the end. Theory analysis and computer simulation results show that this approach can effectively realize the PN sequence blind estimation from the input DS-SS signals with residual carrier in lower SNR. | Tianqi Zhang Shaosheng Dai Guoning Ma Wei Zhang Pu Miao | 2010 | Journal of Systems Engineering and Electronics2010，21，1： | 8 |
| 2 | Effects of climate change and land-use changes on spatiotemporal distributions of blue water and green water in Ningxia, Northwest China显示文摘Water resources are a crucial factor that determines the health of ecosystems and socio-economic development;however,they are under threat due to climate change and human activities.The quantitative assessment of water resources using the concept of blue water and green water can improve regional water resources management.In this study,spatiotemporal distributions of blue water and green water were simulated and analyzed under scenarios of climate change and land-use changes using the Soil and Water Assessment Tool(SWAT)in Ningxia Hui Autonomous Region,Northwest China,between 2009 and 2014.Green water,a leading component of water resources,accounted for more than 69.00%of the total water resources in Ningxia.Blue water and green water showed a single peak trend on the monthly and annual scales during the study period.On the spatial scale,the southern region of Ningxia showed higher blue water and green water resources than the northern region.The spatiotemporal distribution features of blue water,green water,and green water flow had strong correlations with precipitation.Furthermore,the simulation identified the climate change in Ningxia to be more influential on blue water and green water than land-use changes.This study provides a specific scientific foundation to manage water resources in Ningxia when encountered with climate change together with human activities. | WU Jun DENG Guoning ZHOU Dongmei ZHU Xiaoyan MA Jing CEN Guozhang JIN Yinli ZHANG Jun | 2021 | Journal of Arid Land2021，13，7： | 3 |
| 3 | Efficient large fragment deletion in plants:double pairs of sgRNAs are better than dual sgRNAs显示文摘Dear Editor,Clustered Regularly Interspaced Short Palindromic Repeats(CRISPR)is a powerful and versatile gene editing system that has been extensively utilized in various animals and plants,which holds enormous potential and value for scientific research and breeding.However,single-targeted CRISPR can only induce a few base deletions,insertions,or substitution.Ideally,thesemutations result in premature termination of the protein encoded by the target gene,leading to a loss of function[1]. | Guoning Zhu Lingling Zhang Liqun Ma Qing Liu Kejian Wang Jinyan Li Guiqin Qu Benzhong Zhu Daqi Fu Yunbo Luo Hongliang Zhu | 2023 | Horticulture Research2023，10，10： | 1 |
| 4 | In situ performance and stability tests of large-area flexible polymer solar cells in the 35-km stratospheric environment显示文摘Flexible organic solar cells(FOSCs)are one of the most promising power sources for aerospace aircraft due to their atractive advantages with high power-per-weight ratio and excellent mechanical flexibility.Understanding the performance and stability of high-performance FOSCs is essential for the further development of FOSCs for aerospace applications.In this paper,after systematic investigations on the performance of the state-of-the-art high-performance solar cells under thermal cycle and intensive UV irradiation conditions,in situ performance and stability tests of the solar cells in the 35 km stratospheric environment were carried out through a high-altitude balloon uploading.The encapsulated FOSCs with an area of 0.64 cm^(2)gave the highest power density of 15.26 mW/cm^(2)and an efficiency over 11%,corresponding to a power-per-weight ratio of over 3.32 k W/kg.More importantly,the cells showed stable power output during the 3-h continuous flight at 35 km and only 10%performance decay after return to the lab,suggesting promising stability of the FOSCs in the stratospheric environment. | Zihan Xu Guoning Xu Qun Luo Yunfei Han Yu Tang Ying Miao Yongxiang Li Jian Qin Jingbo Guo Wusong Zha Chao Gong Kun Lu Jianqi Zhang Zhixiang Wei Rong Cai Yanchu Yang Zhaojie Li Chang-Qi Ma | 2023 | National Science Review2023，10，4： | 0 |
| 5 | Structure tailorable triple-phase and pure double-polar-phase flexible IF-WS_(2)@poly(vinylidene fluoride)nanocomposites with enhanced electrical and mechanical properties显示文摘A new low-cost high-permittivity flexible nanocomposite consisting of a polyvinylidene fluoride(PVDF)matrix and fullerene-like tungsten disulfide nanoparticle(IF-WS2 NP)filler was fabricated via a simple solution route.A comprehensive investigation by X-ray diffraction,attenuated total reflection-infrared spectroscopy,and differential scanning calorimetry(DSC)showed that 0.5e1 vol% of IF-WS_(2) induced a nonpolar α-phase to coexisting triple-phase transition in PVDF,whereas a slightly higher loading of 2 vol% induced pure double-polar β- and γ-phases.These results indicate that the structure and properties of the fabricated nanocomposite are easily tailorable.DSC during heating and cooling cycles and morphology observations further indicated that a polar phase was induced by the nucleation effect of the IF-WS2 NPs and electrostatic interactions.As a consequence of the multiphase coexistence and structure homogeneity,nanocomposites with approximately 0.5-1 vol% of IF-WS_(2) NPs showed enhanced dielectric and energy-storage performance as well as enhanced tensile strength and elongation.The new phase-tailorable nanocomposites with balanced properties are promising for applications as energystorage capacitors,piezoelectric sensors,and other flexible multifunctional components.The results of this study will serve to deepen the understanding of the polymer polymorph and provide directions on new routes for fabrication of smart materials. | Dong Guo Kai Cai Pingye Deng Guoning Si Liangying Sun Fahui Chen Honglong Ning Li Jin Jingtao Ma | 2020 | Journal of Materiomics2020，6，3： | 0 |
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