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VOC emitted by biopharmaceutical industries:Source profiles,health risks,and secondary pollution

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Journal of Environmental Sciences 2024年第1期135卷 570-584页

作者： Jiawei ma Lin Li State Key Laboratory of Environmental Aqua.ic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China Na.ional Engineering Laboratory for VOCs Pollution Control material&Technology University of Chinese Academy of SciencesBeijing 101408China

The biopharmaceutical industry contributes substantially to vola.ile orga.ic compounds(VOCs)emissions,causing growing concerns and social developmental *** study conducted an on-site investiga.ion of the process-based emission of VOCs from three biopharmaceutical *** the workshops of the three enterprises,26 VOCs were detected,which could be sorted into 4 classes:hydrocarbons,aroma.ic hydrocarbons,oxygen-containing compounds,and nitrogen-containing *** were the main components of waste gases,accounting for 44.13%-77.85%of the overall ***-based source profiles were compiled for each process unit,with the fermenta.ion and extraction units of tiamulin fumarate being the main source of VOC *** heptanone,vinyl acetate,diethyla.ine,propylene glycol methyl ether(PGME),and benzene were screened as priority pollutants through a fuzzy comprehensive evalua.ion *** level concentra.ion simula.ion results of the Gauss plume diffusion model demonstrated that the diffusivity of VOCs in the atmosphere was rela.ively high,indica.ing potential non-carcinogenic and carcinogenic risks 1.5-2 km ***,the process-based forma.ion potentials of ozone and secondary orga.ic aerosols(SOAs)were determined and indicated that N-methyl-2-pyrrolidone,dimethyl heptanone,and PGME should be preferentially controlled to reduce the ozone forma.ion potential,whereas the control of benzene and chlorobenzene should be prioritized to reduce the genera.ion of *** results provide a ba.is for understanding the characteristics of VOC emission by biopharmaceutical industries and their diffusion,potentially allowing the development of measures to reduce health risks and secondary pollution.

关键词： Biopharmaceutical Vola.ile orga.ic compound Priority pollutant Exposure risk Secondary pollution

Deterministic and Robust Volt-var Control Methods of Power System Based on Convex Deep Learning

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Journal of Modern Power Systems and Clean Energy 2024年第3期12卷 719-729页

作者： Qing ma Changhong Deng the School of Electrical Engineering and Automa.ion Wuhan UniversityWuhanChina

Volt-var control(VVC)is essentially a non-convex optimiza.ion problem due to the non-convexity of power flow(PF)constraints,resulting in the difficulty in obtaining the optimum without convexity *** existing second-order cone method for the convexity conversion often leads to a sharp increase in PF constraints and optimiza.ion va.iables,which in turn increases the optimiza.ion difficulty or even leads to optimiza.ion *** paper first proposes a deterministic VVC method based on convex deep learning power flow(DLPF).This method uses the input convex neural network(iCNN)to establish a single convex mapping between state parameters and node voltage to complete the convexity conversion while the optimiza.ion va.iables only correspond to reactive power equipment,which can ensure the global optimum with extremely fast computa.ion *** cope with the impact brought by the uncertainty of distributed energy and omit the additional worst scena.io search of tra.itional robust VVC,this paper proposes robust VVC method based on convex deep learning interval power flow(DLiPF),which continues to adopt iCNN to establish another convex mapping between state parameters and node voltage *** DLiPF with DLPF,this method decreases the modeling and optimiza.ion difficulty of robust VVC *** results on 30-bus,118-bus,and 200-bus systems prove the correctness and ra.idity of the proposed methods.

关键词： Volt-var control convexity conversion convex deep learning power flow

Copper slag assisted coke reduction of phosphogypsum for sulphur dioxide prepara.ion

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Chinese Journal of Chemical Engineering 2024年第1期65卷 43-53页

作者： Dong ma Qinhui Wang State Key Laboratory of Clean Energy Utiliza.ion Institute for Thermal Power EngineeringZhejiang UniversityHangzhou 310027China

The reduction of phosphogypsum(PG)to lime slag and SO_(2)using coke can effectively alleviate the environmental problems caused by ***,the PG decomposition temperature remains high and the product yield remains *** adding additives,the decomposition temperature can be further reduced and PG decomposition rate and product yield can be ***,the use of current additives such as Fe_(2)O_(3)and SiO_(2)brings the problem of increa.ing economic ***,it is proposed to use solid waste copper slag(CS)as a new additive to reduce PG to prepare SO2,which can reduce the cost and meet the environmental benefits at the same *** effects of proportion,temperature and thermosta.ic time on PG decomposition are investigated by experimental and kinetic analysis combined with FactSage thermodyna.ic calcula.ions to optimize the roasting ***,the reaction mecha.ism is *** is found that adding CS to the coke and PG system can increase the rate of PG decomposition and SO_(2)yield while lowering the PG decomposition *** example,when the CS/PG mass ra.io increases from 0 to 1,PG decomposition rate increases from 83.38%to 99.35%,SO_(2)yield increases from 78.62%to 96.81%,and PG decomposition temperature decreases from 992.4℃to 949.6℃.The optimal reaction parameters are CS/PG mass ra.io of 1,Coke/PG mass ra.io of 0.06 at 1100℃for 20 min with 99.35%PG decomposition rate and 96.81%SO_(2) *** process proceeds according to the following reactions:2CaSO_(4)+ 0.7C + 0.8Fe_(2)SiO_(4)→0.8Ca_(2)SiO_(4)+ 0.2Ca_(2)Fe_(2)O_(5)+ 0.4Fe_(3)O_(4)+2SO_(2)+ 0.7CO_(2)Finally,a process for decomposing PG with coke and CS is proposed.

关键词： Phosphogypsum Sulfur dioxide Copper slag Fluidized-bed Reduction Waste treatment

On the Security of Homomorphic Encryption Schemes with Restricted Decryption Oracles

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Journal of Systems Science & Complexity 2024年第5期37卷 2240-2261页

作者： ma Guangsheng Li Hongbo School of mathema.ics and Physics North China Electric Power University Academy of mathema.ics and Systems Science Chinese Academy of Sciences University of Chinese Academy of Sciences

Fully homomorphic encryption（FHE） can be used for privacy-preserving aggrega.ion of medical data. in this typical applica.ion, the security against passive attacks has been well studied by Li and Micciancio（2021）. in this paper, the authors further consider a “nearly passive” kind of attack, where the attacker may behave like a passive attacker in the view of the third-party *** capture the security against this hard-to-detect attack, the authors propose a new notion of iND-CPArDsecurity. The authors show that the standard LWE encryption and its related FHE schemes can not defend against iND-CPArDattack, even under a stricter rule limiting the content and number of queries made by the attacker. To make the applica.ion of FHE schemes more secure, the authors discuss some possible modifica.ions that may serve as countermeasures to iND-CPArDattack.

关键词： Homomorphic encryption privacy secure cloud computing security

A review of recent advances in the effects of surface and interface properties on ma.ine propellers

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Friction 2024年第2期12卷 185-214页

作者： manfu ZHU Liran ma State Key Laboratory of Tribology in Advanced Equipment Tsinghua UniversityBeijing 100084China

Ma.ine propellers are important propulsion devices for both surface ships and underwater *** severe environmental problems have required further performance enhancement for ***,tra.itional methods to improve propeller performances through geometrical and structural optimiza.ions have been extensively investigated,while the underlying mecha.isms of the effects of surface and interface properties on ma.ine propellers are still far from being fully *** paper presented a comprehensive review of recent advances in the effects of surface and interface properties,such as surface roughness and surface wetta.ility,on ma.ine propellers with an empha.is on the significant improvements in both hydrodyna.ic and ca.ita.ion performances,hoping to arouse more in-depth investiga.ions in the field of surface/interface science and technologies on ma.ine propellers,and also promote the state-of-the-art technologies,such as superlubricity technology,into practical applica.ions.

关键词： ma.ine propellers hydrodyna.ics ca.ita.ion surface roughness surface wetta.ility

Damping Characteristic Analysis and Optimiza.ion of Wind-thermal-bundled Power Transmission by LCC-HVDC Systems

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Journal of Modern Power Systems and Clean Energy 2024年第1期12卷 299-312页

作者： Liwen Zheng Shiying ma the Power System Department China Electric Power Research InstituteBeijing 100192China

With the ra.id development of renewable energy,wind-thermal-bundled power transmission by line-commutated converter based high-voltage direct current(LCC-HVDC)systems has been widely *** dyna.ic interaction mecha.isms among permanent magnet synchronous generators(PMSGs),synchronous generators(SGs),and LCC-HVDC system become *** deal with this issue,a path analysis method(PAM)is proposed to study the dyna.ic interaction mecha.ism,and the damping reconstruction is used to analyze the damping characteristic of the ***,based on the modular modeling,linea.ized models for the PMSG subsystem,the LCC-HVDC subsystem,and the SG subsystem are ***,based on the closed-loop transfer function diagram of the system,the disturbance transfer path and coupling rela.ionship among subsystems are analyzed by the PAM,and the damping characteristic analysis of the SG-dominated oscilla.ion mode is studied based on the damping *** with the PAM,the small-signal model of the system is obtained and eigenvalue analysis results are ***,the effect of the control parameters on the damping characteristic is analyzed and the conclusions are verified by time-domain ***,the penalty functions of the oscilla.ion modes and decay modes are taken as the objective function,and an optimiza.ion strategy based on the Monte Carlo method is proposed to solve the parameter optimiza.ion *** simula.ion results are presented to va.idate the effectiveness of the proposed strategy.

关键词： Wind-thermal-bundled power transmission line-commutated converter based high-voltage direct current(LCC-HVDC) path analysis method(PAM) damping characteristic analysis Monte Carlo method

Finite-time Prescribed Performance Time-Varying Forma.ion Control for Second-Order Multi-Agent Systems With Non-Strict Feedback Based on a Neural Network Observer

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iEEE/CAA Journal of Automa.ica Sinica 2024年第4期11卷 1039-1050页

作者： Chi ma Dianbiao Dong the School of Mecha.ical Engineering Northwestern Polytechnical UniversityXi’an 710072China

This paper studies the problem of time-varying forma.ion control with finite-time prescribed performance for nonstrict feedback second-order multi-agent systems with unmeasured states and unknown *** eliminate nonlinea.ities,neural networks are applied to approximate the inherent dyna.ics of the *** addition,due to the limita.ions of the actual working conditions,each follower agent can only obtain the locally measurable partial state informa.ion of the leader *** address this problem,a neural network state observer based on the leader state informa.ion is ***,a finite-time prescribed performance adaptive output feedback control strategy is proposed by restricting the sliding mode surface to a prescribed region,which ensures that the closed-loop system has practical finite-time sta.ility and that forma.ion errors of the multi-agent systems converge to the prescribed performance bound in finite ***,a numerical simula.ion is provided to demonstrate the practica.ity and effectiveness of the developed algorithm.

关键词： Finite-time control multi-agent systems neural network prescribed performance control time-varying forma.ion control

input-to-State Sta.ility for impulsive Switched Singular Systems with Mismatched Disturbances

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Journal of Systems Science & Complexity 2024年第3期37卷 924-946页

作者： YANG Anqing ma Shuping School of informa.ion Engineering Shandong Management UniversityJinan 250357China School of mathema.ics Shandong UniversityJinan 250100China

This work investigates the input-to-state sta.ility(iSS)problem for impulsive switched singular systems(iSSSs)with mismatched *** this paper,‘disturbance’is a general concept that includes model uncertainty,unknown system dyna.ic,external disturbance,*** modified uncertainty and disturbance estimator(UDE)-based control method is presented for singular systems and iSSSs,a virtual control is introduced to offset the effects of mismatched *** the ba.is of a discontinuous multiple Lyapunov functional and admissible edge-dependent average dwell time(AED-ADT)method,several sufficient conditions in terms of linear matrix inequa.ities(LMis)are obtained to ensure that the closed-loop systems are regular,impulse-free and ***,two examples are given to demonstrate the effectiveness of the proposed results.

关键词： impulsive switched singular systems input-to-state sta.ility UDE-based control

Hydra.ion lubrica.ion modulated by water structure at TiO2–aqueous interfaces

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Friction 2024年第4期12卷 591-605页

作者： Pingsu ma Yuan LiU Ke HAN Yu TiAN Liran ma State Key Laboratory of Tribology in Advanced Equipment Department of Mechanical EngineeringTsinghua UniversityBeijing 100084China

The nature of solid-liquid interfaces is of great significance in *** advances have been made in lubrica.ion based on hydra.ion ***,a detailed molecular-level understanding is still ***,we investigated water molecule beha.iors at the TiO2-aqueous interfaces by the sum-frequency genera.ion vibra.ional spectroscopy(SFG-VS)and atomic force microscope(AFM)to elucidate the fundamental role of solid-liquid interfaces in *** contributions of water structures and hydra.ion effects were revealed,where water structures played the dominant role in lubrica.ion for TiO2 surfaces of varying hydrophilicity,while hydra.ion effects dominated with the increa.ing of ion *** lubrica.ion is observed on the initial TiO2 surfaces with strongly H-bonded water molecules compared to the hydrophilic TiO2 surfaces with more disordered *** stable ordered water arrangement with strong hydrogen bonds and the shear plane occurring between the ordered water layer and subsequent water layer may play a significant role in achieving lower *** adsorbed hydrated molecules with the increa.ing ionic concentra.ion perturb ordered water but lead to the enhancement of hydra.ion effects,which is the main reason for the improved lubrica.ion for both *** work provides more insights into the detailed molecular-level understanding of the mecha.ism of hydra.ion lubrica.ion.

关键词： hydra.ion lubrica.ion interfa.ial water structures hydra.ion effects tita.ium dioxide(TiO2)