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SSRN 2023年

作者： Zhao, Junpeng Han, Minjie Ma, Aimin Jiang, Feng Chen, Rui Dong, Yongzhen Wang, Xufeng Ruan, Shilong Chen, Yiping College of Food Science and Technology Huazhong Agricultural University Shizishan Street Hongshan District Hubei Wuhan430070 China State Key Laboratory of Marine Food Processing and Safety Control Dalian Polytechnic University Liaoning Dalian116034 China Daye Public Inspection and Test Center Hubei Daye435100 China Hubei Provincial Supervision and Inspection Research Institute for Products Quality China

Accurate detection of viable pathogens is crucial for preventing outbreaks of foodborne diseases. In this study, we integrated artificial intelligence and single microsphere to develop a phage and Clostridium butyricum Argonaute (CbAgo)-mediated fluorescence biosensor for detecting viable Salmonella typhimurium (S. typhimurium) without DNA extraction and amplification. Phage was utilized to induce lysis of viable S. typhimurium and release of its DNA, which was subsequently cleaved by CbAgo to obtain target DNA that guides a newly targeted cleavage of fluorescent probes. Then, the fluorescence signal was accumulated on the streptavidin-modified single microsphere, and finally processed by artificial intelligence to achieve highly sensitive detection of S. typhimurium with the limit of detection at 40.5 CFU/mL, and linear range at 50-107 CFU/mL). Furthermore, the standard recovery rates and coefficients of variation are 93.22%-106.02% and 1.47%-12.75%, respectively. The proposed biosensor has high sensitivity and selectivity, which will become a new method to rapidly and effectively detect foodborne pathogens. © 2023, The Authors. All rights reserved.

关键词： Microspheres

Emissions of VOCs and SVOCs From Polyvinyl Chloride Building Materials: Contribution to Indoor Odor and Inhalation Health Risks

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SSRN 2022年

作者： Xue, Jing Cai, Hanmei Li, Weifang Pei, Yipu Guan, Hongyan Guo, Zhongbao Wu, Chuandong Qu, Chen Li, Wenhui Liu, Jiemin School of Chemistry and Biological Engineering University of Science and Technology Beijing Beijing100083 China State Environmental Protection Key Laboratory of Odor Pollution Control Tianjin Academy of Ecoenvironmental Sciences Tianjin300191 China China Building Material Test & Certification Group Co Ltd Beijing100024 China

Volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) emitted from indoor building materials may cause indoor air pollution and adverse health effects to residents. However, limited information is available on the odor and health risk of VOCs and SVOCs emissions from polyvinyl chloride (PVC) materials, which are widely used for interior decoration. In this study, the concentration of VOCs and SVOCs emitted from PVC wallpaper and flooring were tested by emission chamber method and micro-chamber method. Hazards of PVC building materials to people in terms of odor contribution and inhalation health risk were then illustrated. Results showed that 14 VOCs (including four alkanes, one aromatic and nine oxygenated compounds) and 4 SVOCs (including methyl hexadecanoate, di(2-ethylhexyl) phthalate (DEHP), bis(2-ethylhexyl) adipate (DOA), and di-2-ethylhexyl terephthalate (DOTP)) were detected from the PVC wallpaper and PVC flooring samples emissions. Triethyl phosphate (55.3%) was the main VOC emitted from PVC wallpaper materials, while cyclohexanone (22.4%), n-butyl acetate (21.6%), and 4-methyl-2-pentanone (12.7%) were major VOCs emitted from PVC flooring materials. DOA (1.76 mg/m3) and methyl hexadecanoate (13.0 mg/m3) were the SVOCs with the highest emission concentrations in PVC flooring and PVC wallpaper, respectively. The dominant substance causing odor pollution from PVC wallpaper and flooring was methyl hexadecanoate and cyclohexanone, and cyclohexanone and n-butyl acetate, respectively. Health risk results indicated that the carcinogenic risks (R) of DEHP was below the acceptable level, and the non-carcinogenic effects (HQ) of 2-ethyl-1-hexanol and cyclohexanone were much greater than the acceptable level (HQ=1) and should be given special attention. © 2022, The Authors. All rights reserved.

关键词： Building materials

Mechanism and influence of removing algae with chlorine dioxide treatment for ship ballast water

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Mechanism and influence of removing algae with chlorine diox...

作者： Linan Jia Dawen Jiao Yin Yue Xiaotao Shi Lin Sun Science and Technology on Underwater Test and Control Laboratory

This study aims at examining the performance of the ClO on treating ballast water of Dalian new port area foreign trade oil pool in the cases of different experimental parameters,and Cylindrospermopsis raciborskii（CR）,Gymnodinium catenatum（GC） and Gymnodinium ***（GCM） are used for this *** results shows that under certain test condition,the removal rates are in proportion to the dosage of ClO and reaction time,and inversely proportion to pH value,humic acid and ammonia nitrogen ***,on operating at the optimal dosage of ClO and parameters of experiment,this process is proven to be an effective technology to remove these three algae and organic compounds in ballast *** ballast water,the removal ability of ClO for these three algae is less sensitive to pH value,humic acid and ammonia nitrogen content than to ClO dosage and reaction *** GC,GCM and CR with ClO are attributed to the second order *** the performance of such process,could serve to develop management strategies that enable mitigating the impacts of harmful substance in ballast water and help improving and ensuring quality of ballast water.

关键词： GCM Mechanism and influence of removing algae with chlorine dioxide treatment for ship ballast water

Experimental Study on Acoustic Attenuation of Bubble Wake

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Experimental Study on Acoustic Attenuation of Bubble Wake

作者： Jing Han Shuai Lv Zhongpeng Wu Mingwei Zhang Jin Bai Science and Technology on Underwater Test and Control Laboratory

When ship sails on the water surface, it will form a wake containing a large number of bubbles for different scales. The existence of bubbles will cause the attenuation of sound waves. In this paper, bubbles with different sizes are generated in the pool by using ceramic tube array. An experimental study on the acoustic attenuation characteristics of sound waves in bubbles was carried out for still water, small bubbles, medium-sized bubbles and large *** experimental research, it is found that the existence of bubbles makes the acoustic signal decay obviously. At different frequencies, bubbles decay more than 10dB relative to still water. Large bubbles have the strongest attenuation effect on acoustic signals, averaging over 20dB. The medium and small bubbles are similar to the attenuation of the acoustic signal. The acoustic signal intensity in static water and different scale bubbles is basically the same as the frequency.

关键词： Experimental Study on Acoustic Attenuation of Bubble Wake

Envelope Phase Shift Feature Extraction of underwater Target Echo

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Envelope Phase Shift Feature Extraction of Underwater Target...

作者： Jintao Yong Yunfei Chen Yang Zhang Bing Jia Guijuan Li Science and Technology on Underwater Test and Control Laboratory

Aiming at the problem of target classification with different physical property parameters, the phase characteristics of echo envelope associated with different physical property parameters are studied, and the feature extraction method of the phase shift characteristics of the target echo envelope is established. The extraction method and the feature resolution performance of the phase shift characteristics of echo envelope are verified by the water-tank test of cylindrical targets with different materials and finite length. The experimental results of the underwater cylindrical target echo show that the feature of target echo envelope phase shift has significant difference with the change of target material, structure and radial scale. The phase shift feature of underwater target echo envelope has good performance for targets with different physical property parameters.

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Numerical computation on the scattering sound field distribution of rigid sphere in shallow water waveguide

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Numerical computation on the scattering sound field distribu...

作者： Wang Jihui Li Guijuan Jia Bing Wang Zhenshan Wang Rui Science and Technology on Underwater Test and Control Laboratory

Numerical computational model about the scattering fields of rigid sphere in shallow water waveguide is accomplished using boundary element method and normal mode model.A kind of modified CHIEF boundary element method is used to solve the non-uniqueness problem at characteristic frequency for exterior sound field *** green function for shallow water waveguide acoustic wave propagation is modified based on the normal mode *** acoustic pressure in the far field yields Kirchhoff Helmholtz equation and the scattering sound field distribution of rigid sphere in a Pekeris waveguide is *** the scattering sound field distribution of rigid sphere in the free field is *** results indicate that the waveguide influences the sound propagation,and it need to pay attention during the test.

关键词： Numerical computation on the scattering sound field distribution of rigid sphere in shallow water waveguide

Dual-Frequency Vortex Beam Generation Using Coding Metasurface

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Dual-Frequency Vortex Beam Generation Using Coding Metasurfa...

International Applied Computational Electromagnetics Society Symposium (ACES)

作者： Junfeng Li Xianglin Kong Fengjun Wang Zhuowei Miao Xiaoyi Wang Xiaopeng Shen Shengjun Zhang Lei Zhao School of Information and Control Engineering China University of Mining and Technology Xuzhou China National Key Laboratory of Science and Technology on Test Physics & Numerical Mathematical Beijing China School of Information Science and Engineering Southeast University Nanjing China Department of Electrical Engineering Polytechnique Montreal Montreal Quebec Canada School of Materials Science and Physics China University of Mining and Technology Xuzhou China

This paper presents a dual-frequency coding metasurface (CM) for vortex beam generation. The metasurface unit cell is realized with two symmetric metal layers separated by a dielectric substrate. Each metal layer consists of an outer square ring, a middle square ring, and an inner rhombus patch. Two out-of-phase transmitting states in two bands are achieved by rotating the inner rhombus patch by 90 °. Two 1 = + 2 vortex beams are then realized in two different bands by properly distributing the two states on the metasurface aperture. A metasurface with $30 \times 30$ elements is designed, simulated, and experimentally demonstrated. The experimental results agree well with the simulating ones, showing that the metasurface achieves a high transforming efficiency in both Ku (13.6-14.8GHz) band and Ka (26.7-27.7 GHz) band.

关键词： Wireless communication Electric potential Analytical models Computational modeling Dielectric substrates Metals Apertures

Experimental Study on Ag Modified CeO2 as Catalyst for Soot Oxidation

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SSRN 2022年

作者： Pu, Ping Fang, Jia Yang, Yi Chen, Chen Yi, Chengcheng Yan, Yan Meng, Zhongwei Pan, Suozhu Lin, Bin Vehicle Measurement Control and Safety Key Laboratory of Sichuan Province School of Automobile and Transportation Xihua University Chengdu610039 China School of Mechanical and Electrical Engineering University of Electronic Science and Technology of China Chengdu611731 China Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology of Sichuan Xihua University Chengdu610039 China Sichuan Yilan Zhichuang Technology Co. Ltd Chengdu610213 China Xihua University China

Ag/CeO2 catalyst is synthesized by hydrothermal method, which has been study under the effects of different catalyst content, Ag load and ash through activity and characterization tests. Ag loading increases the catalytic activity of CeO2, and the peak combustion temperature of soot decreases by 74°C. The catalytic effect of Ag/CeO2 is affected by catalyst content, Ag load and ash content. The optimum weight ratio of soot/catalyst is 1/10, and 10wt% is the saturation value of Ag load at CeO2. Ash inhibits the promoting effect of Ag/CeO2 in the oxidation process of soot. This study provides a theoretical basis for the industrial application of Ag/CeO2 catalyst in gasoline engine, and also provides a research idea for the low temperature oxidation of soot. © 2022, The Authors. All rights reserved.

关键词： Cerium oxide

Credibility Evaluation of Pems Measurements in Rde tests: Nox Measurement Uncertainty

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SSRN 2022年

作者： Su, Sheng Hou, Pan Lyu, Liqun Wang, Xin Lyu, Tao Lai, Yitu Luo, Wanyou Ge, Yunshan Wang, Yachao Wang, Qihu College of Marine Equipment and Mechanical Engineering Jimei University Xiamen361021 China Xiamen Environment Protection Vehicle Emission Control Technology Center Xiamen361023 China National Laboratory of Automotive Performance & Emission Test School of Mechanical Engineering Beijing Institute of Technology Beijing100081 China State Environmental Protection Key Laboratory of Vehicle Emission Control and Simulation Chinese Research Academy of Environmental Sciences Beijing100012 China Qinghai Plateau Technology Development Co. Ltd. Xining810000 China

First systematic evaluation on the NOx measurement uncertainty of Portable Emission Measurement System (PEMS) has been completed in China. Zero and span drift, parameters directly related to the measurement accuracy, were re-evaluated, and the results showed that the zero and step drifts were not linear or stepped, which were independent of to the boundary conditions or measurement principle. The range of zero drift was ± 3.0ppm, meanwhile, more than 95% span drifts were within a range of 1.5%. Then the largest additional NOx emissions due to the step zero drift of 3ppm was 9.4mg/km with the worst case being 6.6mg/km by span drift under Worldwide Light-Duty Vehicle test Cycle(WLTC). Bring these parameters into the evaluation framework, the NOx measurement uncertainty corresponding to China-6a and China-6b were 37.1% and 56.3% respectively, which are larger than previous EU evaluation results, mainly due to the more stringent NOx limit. © 2022, The Authors. All rights reserved.

关键词： Uncertainty analysis

control design under attacks of multi-agent switched systems via arbitrary switching

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Control design under attacks of multi-agent switched systems...

Chinese Automation Congress (CAC)

作者： Zhanjie Li Yajing Ma Institute of Advanced Technology for Carbon Neutrality Nanjing University of Posts and Telecommunications Nanjing China Provincial Engineering Research Center for New Energy Vehicle Intelligent Control and Simulation Test Technology Sichuan Xihua University Chengdu China School of Internet of Things Jiangsu Key Laboratory of Broadband Wireless Communication and Internet of Things Nanjing University of Posts and Telecommunications Nanjing China

In this paper, the consensus control against attacks for a type of nonlinear multi-agent switched systems under arbitrary switching is studied. The attacks corrupt the information data, which cannot be used for the feedback design. Meanwhile, the switching logic is not allowed to be designed. To tackle the complicated effects, some intermediate variables and adaptive laws are introduced to compensate the uncertainties. By constructing a common Lyapunov function, an adaptive protocol is proposed such that the outputs of the agents achieve consensus against attacks under arbitrary switching.

关键词： Switched systems Uncertainty Automation Adaptive systems control design Switches Consensus control