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From flatness, GPI observers, GPI control and flat filters to observer-based ADRC

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Control Theory and Technology 2018年第4期16卷 249-260页

作者： Hebertt sira-RAMIREZ CINVESTAV-IPN Department of Electrical Engineering Mechatronics Section Avenida IPN No. 2508 Col. San Pedro Zacatenco CP 07360 CDMX Mexico

In this article, we establish the route taken by the author, and his research group, to bring differential flatness to the realm of active disturbance rejection control （ADRC）. This avenue entitled： 1） generalized proportional integral observers （GPIO）, as natural state and disturbance observers for fiat systems, 2） generalized proportional integral （GPI） control, provided with extra integrations, to produce a modular controller known as flat filters （FF＇s） and, finally, 3） the establishing of an equivalence of observer based ADRC with FF＇s. The context is that of pure integration systems. The obtained controllers depend only on the order of the flat system and they are to be directly used on the basis of the available flat output signal in a universal, modular, fashion. The map is complemented with the relevant references where the intermediate techniques were illustrated and developed, over the years, in connection with laboratory experimental implementations.

关键词： Flatness GPI observers GPI control reduced order GPI observers fiat filters

Enhanced adsorption and colorimetric detection of tetracycline antibiotics by using functional phosphate/carbonate composite with nanoporous network coverage

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Journal of Environmental Sciences 2023年第4期126卷 365-377页

作者： Pratchayaporn Yukhajon Titikan Somboon sira Sansuk Materials Chemistry Research Center Department of Chemistry and Center of Excellence for Innovation in ChemistryFaculty of ScienceKhon Kaen UniversityKhon Kaen 40002Thailand Department of Chemistry Faculty of EngineeringRajamangala University of Technology IsanKhon Kaen CampusKhon Kaen 40000Thailand

This work presents efficient tetracycline(TC) antibiotics adsorption using a functional porous phosphate/carbonate composite(PCC). The PCC was fabricated by anion-exchange of phosphate on the surface of vaterite-phase calcium carbonate particle scaffolds. The PCC,having dense nanoporous network coverage with large surface area and pore volume, exhibited excellent TC adsorption in solution. Its adsorption isotherm fitted well to the Freundlich model, with a maximum adsorption capacity of 118.72 mg/g. The adsorption process was spontaneous, endothermic, and followed pseudo-second-order kinetics. From the XPS analysis, the hydrogen bonding and surface complexation were the key interactions in the process. In addition, a colorimetric TC detection method was developed considering its complexation with phosphate ions, originating from PCC dissolution, during *** method was used to detect TC in mg/L concentrations in water samples. Thus, the multifunctional PCC exhibited potential for use in TC removal and environmental remediation.

关键词： Porous composite Calcium carbonate Tetracycline Adsorption Colorimetric detection Surface complexation

Ultra-Violet (UV): A Good Bacterial Sterilizer?

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Journal of Biosciences and Medicines 2023年第2期11卷 80-85页

作者： sira.sidibe Mouhamadou Moustapha Boye Maryam Mouhamadou Ali Traore Biomedical Engineering Department Polytechnical University of West Africa Dakar Senegal Laboratory of Fundamental and Applied Microbiology University Cheikh Anta Diop Dakar Senegal

Introduction: The aim of this study was to improve the DISTER-UV and to perform microbiological quality control at the biomedical laboratory of the West African Polytechnic University from January 2022 to November 2022. Methodology: During this eleven-month prospective study, we set up a quality control device (QCD). For microbiological quality control, we performed different cultures of bacteria with different bacteriological and morphological characteristics at T0 (no sterilization) and at T30 (after 30 minutes of sterilization under DISTER-UV). Results: After the realization, the DCQ attached to the DISTER-UV1 allows to display of the UV wavelength present in the light box. This device also displays and alerts when the UV intensity emitted by the lamps is below 250 nm. During microbiological quality control, the cultures carried out at T30 and incubated for 24 hours did not reveal any bacterial colonies. This shows the bactericidal character of DISTER-UV-2. Conclusion: The improvement and the microbiological quality control allowed us to switch from DISTER-UV1 (without sensor) to DISTER-UV-2 (with sensor or DCQ). The biological control allowed us to affirm that the DISTER-UV-2 is bactericidal.

关键词： Sterilization Ultraviolet Radiation Bactericide Quality Control Bacteria

Titanium dioxide-graphene composite electrochemical sensor for detection of hexavalent chromium

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International Journal of Minerals,Metallurgy and Materials 2022年第3期29卷 529-535页

作者： Natpichan Pienutsa Krittamet Yannawibut Jetthana Phattharaphongmanee Oukrit Thonganantakul sira Srinives Nanocomposite Engineering Laboratory(NanoCEN) Department of Chemical EngineeringFaculty of EngineeringMahidol University25/25 PuttamonthonNakhon Pathom73170Thailand

Hexavalent chromium(Cr(VI))compound is useful to various industries but is toxic and *** this research work,we fab-ricate an amperometric sensor for the determination of Cr(VI),using a titanium dioxide(TiO2)-reduced graphene oxide(rGO)composite as the sensing *** composite was synthesized following sol−gel chemistry,yielding TiO2 nanoparticles of~50 nm in size,immobilized on chemically exfoliated rGO *** composite was employed in a 3-electrode electrochemical cell and operated in an amperometric mode,exhibiting good responses to the 50 to 500 ppb Cr(VI).Our best result from pH 3 Mcilvane’s buffer medium reveals the sensitivity of 9.12×10−4 ppb−1 and a detection limit of 6 ppb with no signal interference from 200 ppm Ca(II),150 ppm Mg(II),and 50 ppb Pb(II).The excellent results of the TiO2-rGO sensor can be attributed to synergic effects between TiO2 and rGO,resulting from the presence of n-p heterojunctions and the formation of the TiO2 nanoparticles on rGO.

关键词： photocatalyst electrochemical sensor hexavalent chromium graphene

Electrochemical Biosensor for Rapid Detection of Viable Bacteria and Antibiotic Screening

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Journal of Analysis and Testing 2019年第1期3卷 117-122页

作者： Nuvia Maria Saucedo sira Srinives Ashok Mulchandani Department of Chemistry University of CaliforniaRiversideCA 92521USA Department of Chemical and Environmental Engineering University of CaliforniaRiversideCA 92521USA Present Address:Department of Chemistry Southern Adventist UniversityCollegedaleTN 37315USA Present Address:Department of Chemical Engineering Mahidol University25/25 Puttamonthon 4 Rd.10SalayaNakhon Pathom 73170Thailand

We have developed a biosensor for the detection of live/viable bacteria based on the response of the conductive polymer 4-(3-pyrrolyl)butyric acid to glucose-induced *** polymer was electrochemically deposited and then functionalized with lectin through EDC/NHS chemistry to capture cells near the sensor surface and introduce selectivity for *** addition of glucose to a three-electrode electrochemical cell containing 10 mM phosphate buffer and the bacteria-immobilized sensor produced an increase in the *** the bound bacteria were treated with antibiotics,the addition of glucose produced a notably reduced signal exhibiting the sensor’s potential to screen for the most effective antibiotic *** biosensor having real-time responses,minimal sample preparation,and the ability to screen antibiotics demonstrates the speed,ease,and suitability essential for application in point-of-care *** detection range was determined to be 6.0×10^(3)-9.2×10^(7)CFU/mL.

关键词： Point of care Pathogen Infectivity Antibiotic Lectin Potentiometry

New steering mechanism for wheeled mobile robots

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Journal of Harbin Institute of Technology(New Series) 2007年第2期14卷 184-188页

作者： sidibe Marie Bernard 付宜利徐贺马玉林 School of Mechanical and Electrical Engineering Center of Advanced Manufacturing Technology Harbin Institute of Technology

A new castor wheel mechanism for omni-directional mobile platform is presented. A motion of translation is transformed into a rotation to steer the wheel with the help of a helical path fits into a translation joint and three rollers whose axes are connected to the driving shaft of the wheel. When the path moves in translation it acts on the rollers for steering. The path-roller friction transmission, the wheel kinematics and the maneuverability have been analyzed.

关键词： castor wheel helical path friction roller maneuverability mobility

Multivariate Statistical Analysis of Dominating Groundwater Mineralization and Hydrochemical Evolution in Gao,Northern Mali

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Journal of Earth Science 2024年第5期35卷 1692-1703页

作者： Adiaratou Traore Xumei Mao Alhousseyni Traore Yahaya Yakubu Aboubacar Modibo sidibe School of Environmental Studies China University of GeosciencesWuhan 430074China College of Construction Engineering Jilin UniversityChangchun 130012China

Population growth and expanding urbanization have caused persistent shortages and contamination of groundwater resources in Mali,*** increase in groundwater salinity makes it more difficult for residents to obtain drinking water,it is necessary to clarify the causes and control factors of groundwater mineralization in Gao region,northern *** on the analysis of the hydrochemical composition of groundwater in 24 boreholes,Piper and Sch?eller diagrams,principal component analysis(PCA)and hierarchical cluster analysis(HCA)are used to carry out multivariate statistical analysis on the main *** results show that the groundwater samples are weakly alkaline,with pH values ranging from 5.83 to 8.40,and the average values of boreholes are 7.50,*** average electrical conductivity(EC)value is 354.4(μS/cm),and the extreme value is between 124.0 and 1247(μS/cm).Water is usually mineralized and presents nine types of water *** three principal components explain 84.42%of the total variance for 13 *** factor F1(58.85%),the factor F2(16.88%)and the factor F3(8.69%)present for the majority of the total data *** addition,multivariate statistical analysis confirmed the genetic relationship among aquifers and identified three main *** related to groundwater mineralization(F1),clustering related to oxide reduction and iron enrichment(F2),and clustering of groundwater pollution caused by nitrate and magnesium(F3).We found that agriculture,weathering activities and dissolution of geological materials promote the mineralization of *** quality in the Gao region is becoming less and less potable because of increasing salinity.

关键词： hydrochemical composition multivariate statistical analysis mineralization hydro-chemical evolution Gao northern Mali hydrogeology

Robust flat filtering DSP based control of the boost converter

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Control Theory and Technology 2016年第3期14卷 224-236页

作者： Hebertt sira-RAMIREZ Arturo HERNANDEZ-MENDEZ Jesus LINARES-FLORES Alberto LUVIANO-JUAREZ Department of Hectrical Engineering Mechatronics Section ClNVESTAV-IPN Av. IPN No. 2508 Col. San Pedro Zacatenco 07360 D.F. Mexico Mexico Universidad Tecnologica de la Mixteca Carretera a Acatlima Kin. 2.5 Huajuapan de Leon Oaxaca Mexico UPIITA-IPN D.F. Mexico Mexico

The article deals with the design and implementation of a flat filter tracking digital controller for a boost DC-DC power converter. A highly perturbed switched boost converter circuit is shown to be efficiently controlled, in a trajectory tracking task for its non-minimum phase output, by means of a suitable linear filter, here addressed as a flat filter. Flat filtering is a natural robust version of generalized proportional integral control （GPIC） by which the effects of arbitrary time varying exogenous disturbances, unknown endogenous nonlinearities and un-modeled dynamics can be jointly attenuated in a conceptually similar fashion to observer-based active disturbance rejection control （ADRC） and algebraic identification based model free control （MFC） but： a） without using extended state observers and b） respecting the original system order in a time-varying simplified model while avoiding algebraic estimation techniques. The proposed control technique based on the TMS320F28335 digital signal processor chip is tested by means of realistic simulations and experimental setup.

关键词： Flat filter DSP-implementation boost converter

Validity and reliability of the Thai version of the Utrecht Gender Dysphoria Scale-Gender Spectrum(UGDS-GS)in Thai youths and young adults with gender dysphoria

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General Psychiatry 2023年第4期36卷 284-293页

作者： Tanawis Jamneankal Komsan Kiatrungrit Jiraporn Arunakul sira Korpaisarn Suthra Auapisithwong Department of Psychiatry Faculty of MedicineSrinakharinwirot UniversityNakhon NayokThailand Department of Psychiatry Faculty of Medicine Ramathibodi HospitalMahidol UniversityBangkokThailand Department of Pediatrics Faculty of Medicine Ramathibodi HospitalMahidol UniversityBangkokThailand Department of Internal Medicine Faculty of Medicine Ramathibodi HospitalMahidol UniversityBangkokThailand Department of Mental Health Ministry of Public HealthChild and Adolescent Mental Health Rajanagarindra Institute(CAMRI)BangkokThailand

Background Many people who are gender variant have undiagnosed gender dysphoria,resulting in delayed receipt of gender-affirming support and prolonged distress in living with their gender-non-conforming *** Utrecht Gender Dysphoria Scale-Gender Spectrum(UGDS-GS)is a newly developed tool that measures dissatisfaction with gender identity and ***,there is no translated version of this tool in ***,the sensitivity,specificity and cut-off point of the UGDS-GS to detect gender dysphoria in people who are transgender remain *** This study translated the UGDS-GS into Thai and then examined the validity and reliability of the Thai *** 185 participants with and without gender dysphoria were selected from the Gender Variation Clinic in Ramathibodi Hospital and from social media *** UGDS-GS was translated into Thai according to the World Health Organization(WHO)guidelines on *** medical records of patients with gender dysphoria and semi-structured interviews were used to confirm the diagnosis of gender ***,the validity and reliability of the instrument were *** The mean age of participants was 30.43(7.98)years among the 51 assigned males(27.6%)and 134 assigned females(72.4%)at *** Thai UGDS-GS average score was 77.82(9.71)for those with gender dysphoria(n=95)and 46.03(10.71)for those without gender dysphoria(n=90).Cronbach’s alpha coefficient was 0.962,showing excellent internal *** addition,exploratory factor analysis showed compatibility with the original version’s *** value of the area under the curve was 0.976(95%confidence interval:0.954 to 0.998),indicating outstanding *** the cut-off point of‘60’,sensitivity and specificity were good(96.84%and 91.11%,respectively).Conclusions The Thai UGDS-GS is an excellent,psychometrically reliable and valid tool for screening gender dysphoria in clinical and community settings in *** cut-

关键词： specificity instrument assigned