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Recursive Fault Estimation With Energy Harvesting Sensors and Uniform Quantization Effects

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IEEE/CAA Journal of Automatica Sinica 2022年第5期9卷 926-929页

作者： yu-ang Wang Bo Shen Lei Zou College of Information Science and Technology Donghua UniversityShanghai 201620 Engineering Research Center of Digitalized Textile and Fashion Technology Ministry of EducationShanghai 201620China IEEE

Dear Editor,In this letter,the recursive fault estimation issue is considered for nonlinear time-varying systems subject to the effects induced by energy harvesting sensors and uniform *** on the energy harvesting mechanism and stochastic distribution of the absorbed energy,the real-time occurrence probability of missing measurements is calculated *** research intends to develop a recursive estimator for the considered nonlinear time-varying system with energy harvesting sensors,such that,under uniform quantization effects,the state and fault can be jointly *** adopting the induction approach,an upper bound is firstly calculated for the estimation error covariances(EECs)of the state and ***,the value of the time-varying estimator parameter is computed through minimizing such calculated upper *** the end,an illustrative example is presented to verify the availability of the developed fault estimation method.

关键词： method estimation estimator

Carbon Footprint Analysis for Baby Strollers

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Chinese Journal of Population,Resources and Environment 2012年第4期10卷 16-21页

作者： yu ang Luo Yifan State Key Laboratory of Marine Environmental Science(Xiamen University) Environmental Science Research Center Xiamen University

The increasing awareness of climate change has led organizations to demand a standard procedure to measure and communicate greenhouse gas(GHG) emissions linked to their products or *** publicly available specification PAS 2050 has been developed in response to broad community and industry desire for a consistent method-carbon footprint for assessing the life cycle GHG emissions of goods and ***,this paper illustrates the implementation of carbon footprint for a baby stroller in accordance with PAS 2050.A fial value of 321 kg per one stroller including package was ***,the study led to identify raw materials production of the stroller as the main source of GHS emissions where efforts need to focus for emission reduction *** case study is hoped to be a starting point for organizations to benefit from the increasing application of carbon footprint assessment.

关键词： baby stroller carbon footprint greenhouse gas emis- sions life cycle PAS 2050

Energy flexibility characteristics of centralized hot water system in university dormitories

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Building Simulation 2023年第4期16卷 641-662页

作者： Zhiqin Rao Shuqin Chen Isaac Lun Lizhi Shen ang yu Huijun Fu College of Civil Engineering and Architecture Zhejiang UniversityHangzhou 310012China Center for Balance Architecture Zhejiang UniversityHangzhou 310012China Department of Architecture and Built Environment University of Nottingham Ningbo ChinaNingbo 315100China Department of General Affairs Zhejiang UniversityHangzhou 310012China

The large-scale application of renewable energy is an important strategy to achieve the goal of carbon neutrality in the building *** flexibility is essential for ensuring balance between energy demand and supply when targeting the maximum penetration rate of renewable energy during the operation of regional integrated energy *** the energy flexibility characteristics of centralized hot water systems,which are an important source of such flexibility,is of great significance to the optimal operation of regional integrated energy ***,in this study,based on the annual real-time monitoring data,the energy flexibility of the centralized hot water system in university dormitories is evaluated from the perspective of available storage capacity(C_(ADR)),recovery time(t_(recovery)),and storage efficiency(η_(ADR)),by the data-driven simulation *** factors influencing the energy flexibility of the centralized hot water system are also *** storage capacity has a strong positive correlation with daily water consumption and a strong negative correlation with daily mean outdoor *** associations indicate that increased water use on the energy flexibility of the centralized hot water system is conducive to optimal *** contrast,higher outdoor temperature is *** hourly mean value of the available storage capacity in spring and winter is found to be around 80 kWh in the daytime,and about twice that in summer and *** time is evenly distributed throughout the year,while t_(recovery)/C_(ADR)in spring and winter is about half that in *** storage efficiency was significantly higher in spring,summer,and winter than in *** hourly mean storage efficiency was found to be about 40%in the *** benefits of activating energy flexibility in spring and winter are the best,because these two seasons have higher available storage capacity and storage efficiency,while the benefit

关键词： energy flexibility centralized hot water system university dormitory back propagation(BP)neural network

Spatiotemporal variations of parameters of internal solitary waves in the northern South China Sea

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Journal of Oceanology and Limnology 2024年第2期42卷 421-438页

作者： yu’ang LIU Yifei JIang Xiaojiang ZHang Zhiyuan Wang yu CAO Huizan Wang College of Meteorology and Oceanography National University of Defense TechnologyChangsha 410000China

The dynamic parameters for internal solitary waves(ISWs)derived from the extended Korteweg-de Vries(eKdV)equation play an important role in the understanding and prediction of *** spatiotemporal variations of the dynamic parameters of the ISWs in the northern South China Sea(SCS)were studied based on the reanalysis of long-term temperature and salinity *** results for spectrum analysis show that there are definite geographical differences for the periodic variation of the parameters:in shallow water,all parameters vary with a wave period of one year,while in deep water wave components of the parameters at other frequencies *** wavelet analysis,the wavelet power spectral densities in deep water exhibited an inter-annual variation *** example,the wave component of the dispersion coefficient with a wave period of about half a year reached its power peak once every two *** on previous work,this inter-annual variation pattern was deduced to be caused by dynamic *** further work on the regulatory mechanisms,empirical orthogonal function(EOF)decomposition was *** was found that the modes of the dispersion coefficient have different geographical distributions,explaining the reason why the wave components in different frequencies appeared in different *** numerical simulation results confirm that the variations in the parameters of the ISWs derived from the eKdV equation could affect the waveforms significantly because of changes in the polarity of the ***,the periodic variations of the dynamic parameters are related to the geographical location because of dynamic processes operating.

关键词： internal solitary waves(ISWs) dynamic parameters eKdV equation spatiotemporal variation polarity empirical orthogonal function(EOF)decomposition

Recent progress in single crystal perovskite X-ray detectors

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Science China(Information Sciences) 2024年第3期67卷 5-19页

作者： Xiao LIU Jun REN yu-ang CHEN Xiangshun GENG Dan XIE Tian-Ling REN School of Integrated Circuits Tsinghua University Beijing National Research Center for Information Science and Technology (BNRist)

Perovskites have attracted extensive attention as radiation detection material due to their long carrier diffusion length and lifetime, high absorption coefficient, and flexible manufacturing process. Compared with polycrystalline structures, single crystal perovskites improve the performance of optoelectronic devices due to their low defect state density, better photoelectric characteristics, and chemical ***, we review the recent progress of single crystal perovskite X-ray detectors. First, we briefly introduced the basic concepts, detection mechanisms, figure of merits of perovskite X-ray detectors, and the preparation methods of single crystal perovskites. Then, we summarized the significant advancements in single crystal perovskite X-ray detectors in recent times. Finally, we discussed the critical challenges and some practicable solutions for developing high-performance X-ray detectors.

关键词： single crystal perovskites carrier transport radiation detection X-ray detectors X-ray imaging

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DFT Investigations About Pyrazine Molecules on Si(100)-2×1 Surface

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Chemical Research in Chinese Universities 2007年第4期23卷 444-451页

作者： yu ang-yang QU Yong-quan HAN Ke-li HE Guo-zhong Center for Computational Chemistry Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 P. R. China

It is important to understand the interface of aromatic molecules on semiconductor surfaces because of the rich functionality of such molecules on semiconductor surfaces. The chemisorption of pyrazine molecules on the Si （100）- 2×1 surface has been investigated using the B3LYP density functional theory with Si9H12 one-dimer and Si15Hl6 two-dimer cluster models. The calculated results predict that N-dative bonded-state, C2=C5 [E4＋2] and the tight- bridgel,2,5,6 products may coexist on the Si（100）-2 × 1 surface.

关键词： Density functional theory Surface Activation energy Adsorption energy

Joint frequency offset tracking and PAPR reduction algorithm in OFDM systems

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Journal of Systems Engineering and Electronics 2010年第4期21卷 557-561页

作者： Lijun Ge Yingxin Zhao Hong Wu Ning Xu yu'ang Jin Wenqi Li College of Information Technical Science Nankai University Tianjin 300071 E R. China

This paper presents an algorithm that aims to reduce the peak-to-average power ratio（PAPR） of orthogonal frequency division multiplexing（OFDM） communication systems while maintaining frequency *** algorithm achieves PAPR reduction by applying the complex conjugates of the data symbol obtained from the frequency domain to cancel the phase of the data symbol.A likelihood estimator is used to obtain the sub-carrier phase error due to the residual carrier frequency offset（RCFO） using the same complex conjugates as a pilot ***,a joint time and frequency domain multicarrier phase locked loop（MPLL） is developed to compensate additional frequency *** results show that this algorithm is capable of reducing PAPR without impacting the frequency tracking performance.

关键词： orthogonal frequency division multiplexing(OFDM) peak-to-average power ration(PAPR) carrier frequency offset complex conjugate multicarrier phase locked loop(MPLL) phase error.

The effect of continuous Ni(Ⅱ) exposure on the organic degradation and soluble microbial product(SMP) formation in two-phase anaerobic reactor

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Journal of Environmental Sciences 2015年第7期27卷 78-87页

作者： Wei Wu Tengteng Duan Hailiang Song Yan Li ang yu Long Zhang Aimin Li State Key Laboratory of Pollution Control and Resources Reuse School of the Environment Nanjing University Jiangsu Key Lab of Environmental Engineering Jiangsu Provincial Academy of Environmental Science School of Energy and Environment Southeast University

A two-phase anaerobic reactor fed with glucose substrate（3 g chemical oxygen demand（COD）/L） was used to investigate the effects of toxic metals on the degradation of organics and the soluble microbial product（SMP） formation. Low concentrations of Ni（II）（5 and10 mg/L） promoted the acid phase, whereas high concentrations（15, 20, and 25 mg/L）exhibited an inhibitory effect on, but did not alter the fermentative method, which mainly involved the fermentation of propionic acid. The methanogenic microorganism exhibited a strong capability adapting constantly increased Ni（II） levels. The acid phase was an accumulation stage of SMP. In the absence of Ni（II）, the high-molecular-weight material in the effluent SMP mainly contained polysaccharide, tryptophan, and casein. Methanogens metabolized most of the polysaccharide, the whole tryptophan content, and part of the casein, leading to the presence of humic acid and protein in effluent. After Ni（II） dosage, the protein and polysaccharide of the acid phase increased, and tryptophan changed, while casein remained stable. More protein than polysaccharide was produced, suggesting the prominent function of protein when addressing the negative effect of toxic metals. The analysis of DNA confirmed the change of bacterial activity.

关键词： Soluble microbial products (SMP) Two-phase anaerobic reactor Upflow anaerobic sludge bed (UASB) Ni(II)

Parallel implementation of w-projection wide-field imaging

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Science Bulletin 2019年第9期64卷 586-594页

作者： Baoqiang Lao Tao An ang yu Wenhui Zhang Junyi Wang Quan Guo Shaoguang Guo Xiaocong Wu Shanghai Astronomical Observatory Key Laboratory of Radio AstronomyChinese Academy of Sciences Guangxi Cooperative Innovation Center of Cloud Computing and Big Data Guilin University of Electronic Technology Guangxi Colleges and Universities Key Laboratory of Cloud Computing and Complex Systems Guilin University of Electronic Technology

w-Projection is a wide-field imaging technique that is widely used in radio synthesis arrays. Processing the wide-field big data generated by the future Square Kilometre Array(SKA) will require significant updates to current methods to significantly reduce the time consumed on data processing. Data loading and gridding are found to be two major time-consuming tasks in w-projection. In this paper, we investigate two parallel methods of accelerating w-projection processing on multiple nodes: the hybrid Message Passing Interface(MPI) and Open Multi-Processing(OpenMP) method based on multicore Central Processing Units(CPUs) and the hybrid MPI and Compute Unified Device Architecture(CUDA)method based on Graphics Processing Units(GPUs). Both methods are successfully employed and operated in various computational environments, confirming their robustness. The experimental results show that the total runtime of both MPI + OpenMP and MPI + CUDA methods is significantly shorter than that of single-thread processing. MPI + CUDA generally shows faster performance when running on multiple nodes than MPI + OpenMP, especially on large numbers of nodes. The single-precision GPU-based processing yields faster computation than the double-precision processing; while the single-and doubleprecision CPU-based processing shows consistent computational performance. The gridding time remarkably increases when the support size of the convolution kernel is larger than 8 and the image size is larger than 2,048 pixels. The present research offers useful guidance for developing SKA imaging pipelines.

关键词： Radio synthesis arrays Square kilometre array Wide field imaging Parallelization w-Projection