{"help":"Return the metadata of a dataset (package) and its resources. :param id: the id or name of the dataset :type id: string","success":true,"result":[{"id":"5842c0c6-90b7-46e7-883a-c54b2251544f","name":"situ-control-microdischarge-characteristics-unipolar-pulsed-plasma-electrolytic-oxidation","title":"In-situ control of microdischarge characteristics in unipolar pulsed plasma electrolytic oxidation of aluminum","author_email":"hermanns@aept.rub.de","maintainer":"Research Data Repository","maintainer_email":"achim.vonkeudell@rub.de","license_title":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","notes":"\u003Cp\u003EMicrodischarges occurring during plasma electrolytic oxidation are the main mechanism promoting oxide growth compared to classical anodization. When the dissipated energy by microdischarges during the coating process gets too large, high-intensity discharges might occur, which are detrimental to the oxide layer. In bipolar pulsed plasma electrolytic oxidation a so called \u0027soft-sparking\u0027 mode limits microdischarge growth. This method is not available for unipolar pulsing and for all material combinations. In this work, the authors provide a method to control the size- and intensity distributions of microdischarges by utilizing a multivariable closed-loop control. In-situ detection of microdischarge properties by CCD-camera measurements and fast image processing algorithms are deployed. The visible size of microdischarges is controlled by adjusting the duty cycle in a closed-loop feedback scheme, utilizing a PI-controller. Uncontrolled measurements are compared to controlled cases. The microdischarge sizes are controlled to a mean value of A = 5\u003Cem\u003E10^-3 mm^2 and A = 7\u003C\/em\u003E10^-3 mm^2, respectively. Results for controlled cases show, that size and intensity distributions remain constant over the processing time of 35 minutes. Larger, high-intensity discharges can be effectively prevented. Optical emission spectra reveal, that certain spectral lines can be influenced or controlled with this method. Calculated black body radiation fits with very good agreement to measured continuum emission spectra (T = 3200 K). Variance of microdischarge size, emission intensity and continuum radiation between consecutive measurements is reduced to a large extent, promoting uniform microdischarge and oxide layer properties. A reduced variance in surface defects can be seen in SEM measurements, after coating for 35 minutes, for controlled cases. Surface defect study shows increased number density of microdischarge impact regions, while at the same time reducing pancake diameters, implying reduced microdischarge energies compared to uncontrolled cases.\u003C\/p\u003E\n","url":"https:\/\/rdpcidat.rub.de\/dataset\/situ-control-microdischarge-characteristics-unipolar-pulsed-plasma-electrolytic-oxidation","state":"Active","log_message":"Edited by kd.","private":true,"revision_timestamp":"Sun, 03\/21\/2021 - 19:50","metadata_created":"Thu, 01\/28\/2021 - 13:35","metadata_modified":"Sun, 03\/21\/2021 - 19:50","creator_user_id":"98105230-4cf4-43e8-bbce-392608ebe04d","type":"Dataset","resources":[{"id":"0012d31a-2874-44fb-8ca9-3f5df09e0220","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Size_Number_evolution.zip","description":"\u003Cp\u003EData corresponding to graphs in figure 4.\u003C\/p\u003E\n\u003Cp\u003EFigure 4(a) size evolution:\u003Cbr \/\u003E\nFile: \u0022size.txt\u0022\u003Cbr \/\u003E\n3 rows delimited by comma:\u003Cbr \/\u003E\n1. Uncontrolled ,   2. Controlled A = 5\u003Cem\u003E10^-3 mm^2,  3. Controlled A = 7\u003C\/em\u003E10^-3 mm^2\u003Cbr \/\u003E\nColumns indicate point in time. Distance between data points is t = 1s.\u003C\/p\u003E\n\u003Cp\u003EFigure 4(a) number evolution:\u003Cbr \/\u003E\nFile: \u0022Number density.txt\u0022\u003Cbr \/\u003E\n3 rows delimited by comma:\u003Cbr \/\u003E\n1. Uncontrolled ,   2. Controlled A = 5\u003Cem\u003E10^-3 mm^2,  3. Controlled A = 7\u003C\/em\u003E10^-3 mm^2\u003Cbr \/\u003E\nColumns indicate point in time. Distance between data points is t = 1s.\u003C\/p\u003E\n","format":"data","state":"Active","revision_timestamp":"Mon, 02\/22\/2021 - 10:57","name":"Figure 4","mimetype":"application\/zip","size":"25.48 KB","created":"Fri, 02\/19\/2021 - 08:08","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Mon, 02\/22\/2021 - 10:57"},{"id":"d303190d-b457-449a-8aa2-d23437dce396","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Voltage_DutyCycle.zip","description":"\u003Cp\u003E(a) Data on the controlled and uncontrolled voltage evolution\u003Cbr \/\u003E\nFile:\u003Cbr \/\u003E\nU_uncontrolled.csv\u003Cbr \/\u003E\nU_controlled5.csv\u003Cbr \/\u003E\nU_controlled7.csv\u003C\/p\u003E\n\u003Cp\u003EFile format:\u003Cbr \/\u003E\n1. Column: time vector in seconds\u003Cbr \/\u003E\n2. Column: Measured voltage in Volts\u003C\/p\u003E\n\u003Cp\u003E(a) Data on the controlled and uncontrolled duty-cycle evolution\u003Cbr \/\u003E\nFile:\u003Cbr \/\u003E\nDC_uncontrolled.csv\u003Cbr \/\u003E\nDC_controlled5.csv\u003Cbr \/\u003E\nDC_controlled7.csv\u003C\/p\u003E\n\u003Cp\u003EFile format:\u003Cbr \/\u003E\n1. Column: time vector in seconds\u003Cbr \/\u003E\n2. Column: Controlled duty-cycle (between 0...1)\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Mon, 02\/22\/2021 - 10:57","name":"Figure 5","mimetype":"application\/zip","size":"90.37 KB","created":"Fri, 02\/19\/2021 - 11:51","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Mon, 02\/22\/2021 - 10:57"},{"id":"ce45eb54-e4c1-4754-b0b4-a980aaa79473","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Voltage_Current.zip","description":"\u003Cp\u003ECurrent and voltages during one pulse cycle.\u003Cbr \/\u003E\nFiles:\u003Cbr \/\u003E\nVoltages:\u003Cbr \/\u003E\nU_uncontrolled.csv\u003Cbr \/\u003E\nU_controlled5.csv\u003Cbr \/\u003E\nU_controlled7.csv\u003C\/p\u003E\n\u003Cp\u003ECurrents:\u003Cbr \/\u003E\nI_uncontrolled.csv\u003Cbr \/\u003E\nI_controlled5.csv\u003Cbr \/\u003E\nI_controlled7.csv\u003C\/p\u003E\n\u003Cp\u003EFile format:\u003Cbr \/\u003E\nFirst column: Time in seconds\u003Cbr \/\u003E\nSecond Column: Uncontrolled Voltage or Current\u003Cbr \/\u003E\nThird Column: Controlled Voltage or Current  (A = 7\u003Cem\u003E10^-3 mm^2)\u003Cbr \/\u003E\nFourth Column: Controlled Voltage or Current  (A = 5\u003C\/em\u003E10^-3 mm^2)\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Mon, 02\/22\/2021 - 10:57","name":"Figure 6","mimetype":"application\/zip","size":"13.01 KB","created":"Fri, 02\/19\/2021 - 11:56","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Mon, 02\/22\/2021 - 10:57"},{"id":"b5438cdb-c50f-46b8-83eb-a4cf5038c757","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Distribution.zip","description":"\u003Cp\u003EMeasured Size and Intensity Distribution for uncontrolled and controlled cases at each point in time (temporal distance between points t = 1s).\u003C\/p\u003E\n\u003Cp\u003EIntensity Distribution:\u003Cbr \/\u003E\nValues between 0-4095.\u003C\/p\u003E\n\u003Cp\u003ECorresponding  files for all 3 measurements:\u003Cbr \/\u003E\nint_dist_uncontrolled.csv\u003Cbr \/\u003E\nint_dist_controlled_5.csv\u003Cbr \/\u003E\nint_dist_controlled_7.csv\u003C\/p\u003E\n\u003Cp\u003EEach column in a file shows the intensity of every detected microdischarge (comma delimited).\u003Cbr \/\u003E\nThe number of the row corresponds to the time in seconds.\u003C\/p\u003E\n\u003Cp\u003ESize Distribution:\u003Cbr \/\u003E\nValues between 0-4095.\u003C\/p\u003E\n\u003Cp\u003ECorresponding  files for all 3 measurements:\u003Cbr \/\u003E\nsize_dist_uncontrolled.csv\u003Cbr \/\u003E\nsize_dist_controlled_5.csv\u003Cbr \/\u003E\nsize_dist_controlled_7.csv\u003C\/p\u003E\n\u003Cp\u003EEach column in a file shows the area as the summed number of pixels for every detected microdischarge (comma delimited).\u003Cbr \/\u003E\nThe number of the row corresponds to the time in seconds.\u003C\/p\u003E\n\u003Cp\u003EFigure 7:\u003Cbr \/\u003E\nScatterplots plotted as intensity and size distribution at a point in time. Data was evaluated at these points in time for uncontrolled and controlled to A_2 = 7*10^-3 mm^2.\u003C\/p\u003E\n\u003Cp\u003EFigure 8:\u003Cbr \/\u003E\nHistograms of photoemission for given time and control regime.\u003Cbr \/\u003E\nIntensity data evaluated at t = 200s and t = 1400s.\u003C\/p\u003E\n\u003Cp\u003EFigure 9:\u003Cbr \/\u003E\nHistograms of the size distribution for given time and control regime.\u003Cbr \/\u003E\nSize data evaluated at t = 200s and t = 1400s.\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Mon, 02\/22\/2021 - 10:57","name":"Figure 7, 8, 9","mimetype":"application\/zip","size":"4.88 MB","created":"Fri, 02\/19\/2021 - 08:19","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Mon, 02\/22\/2021 - 10:57"},{"id":"db9f46e5-fd0b-4214-853f-1b44c2ae99c9","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/OES_Spectra.zip","description":"\u003Cp\u003ETime evolution of OES Spectra for controlled and uncontrolled cases.\u003C\/p\u003E\n\u003Cp\u003EIntensity:\u003Cbr \/\u003E\nIntensity values of spectra in arbitrary units as a matrix (wavelength x time)\u003Cbr \/\u003E\nTime separation between spectra is t = 1s.\u003Cbr \/\u003E\nFiles:\u003Cbr \/\u003E\nOES_controlled.csv\u003Cbr \/\u003E\nOES_uncontrolled.csv\u003C\/p\u003E\n\u003Cp\u003EWavelength values (in nm):\u003Cbr \/\u003E\nwavelength.csv\u003C\/p\u003E\n\u003Cp\u003EFigure 10:\u003Cbr \/\u003E\nWaterfall plot of uncontrolled spectra.\u003Cbr \/\u003E\nEvaluation of OES_uncontrolled.csv\u003C\/p\u003E\n\u003Cp\u003EFigure 11:\u003Cbr \/\u003E\nWaterfall plot of controlled spectra.\u003Cbr \/\u003E\nEvaluation of OES_controlled.csv\u003C\/p\u003E\n\u003Cp\u003EFigure 12:\u003Cbr \/\u003E\n(a) Evaluation of controlled and uncontrolled emission intensity over time at a wavelength of 802 nm.\u003Cbr \/\u003E\n(a) Evaluation of uncontrolled spectra at a time of t = 1000s and calculated black body emission.\u003C\/p\u003E\n\u003Cp\u003EFigure 13:\u003Cbr \/\u003E\n(a) Evaluation of controlled and uncontrolled emission intensity over time at a wavelength of 769.9 nm.\u003Cbr \/\u003E\n(a) Evaluation of controlled and uncontrolled emission intensity over time at a wavelength of 656.3 nm.\u003C\/p\u003E\n","format":"zip","state":"Active","revision_timestamp":"Mon, 02\/22\/2021 - 10:58","name":"Figure 10, 11, 12 13","mimetype":"application\/zip","size":"13.84 MB","created":"Fri, 02\/19\/2021 - 08:29","resource_group_id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","last_modified":"Date changed  Mon, 02\/22\/2021 - 10:58"}],"tags":[{"id":"eb25c9f5-f6ab-4456-b8bc-e870a531bdc2","vocabulary_id":"2","name":"plasma electrolytic oxidation"},{"id":"e76ea744-d2ed-440c-9026-f96dba1e69c1","vocabulary_id":"2","name":"plasma"},{"id":"1bfbc74c-0a7f-4f22-9b7a-5eea1436e633","vocabulary_id":"2","name":"microdischarge"},{"id":"85b6a8b7-76a4-41bb-961f-04267e32170d","vocabulary_id":"2","name":"control"},{"id":"b97e65e5-f71b-4952-8e68-b0541986c7aa","vocabulary_id":"2","name":"oes"},{"id":"f8c3c150-fd59-43cb-b53b-6308b8801d79","vocabulary_id":"2","name":"aluminum"},{"id":"a0a38421-87d6-4634-8468-120fdf48305e","vocabulary_id":"2","name":"PEO"}],"groups":[{"description":"\u003Cp\u003EThe group \u0022Allgemeine Elektrotechnik und Plasmatechnik\u0022 at the faculty for engineering and information science.\u003C\/p\u003E\n","id":"60dfa3fb-4113-4271-8531-8587fa07dcbe","image_display_url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/AEPT2.png","title":"AEPT","name":"group\/aept"}]}]}