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Search results for: FT-IR INVESTIGATION
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Quality Evaluation of Voice Transmission Using BPL Communication System in MV Mine Cable Network
PublicationThis article presents results of a quality evaluation study, considering voice transmission in a 6 kV medium voltage cable network using the BPL (Broadband over Power Line) communication system. The tests are carried out under real mining conditions for the selected power cable without voltage, earthed at both sides. Such a method of monitoring work conditions is of great importance, especially during a disaster. Power cables are...
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Intensification of thermal convection near electric devices using flat screens – computer modelling
PublicationIntensification of natural thermal convection near electric devices is possible by application of additional elements as screens creating convection canals close to the device. In the earlier authors paper the results of the analysis of thermal convection with the use of only one additional screen close to the electric device were presented. This paper presents computer modelling of thermal convection when two screens near the...
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Immunity of residual current devices to the impulse leakage current in circuits with variable speed drives
PublicationThis paper concerns reliability of supply in variable speed drive circuits with residual current devices. During normal operation of these circuits high value of leakage current causes unwanted tripping of residual current devices. Immunity of residual current devices to the impulse leakage current should be evaluated. The system for testing of residual current devices and results of the test are presented
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An Analysis of Uncertainty and Robustness of Waterjet Machine Positioning Vision System
PublicationThe paper presents a new Automatic Waterjet Positioning Vision System (AWPVS) and investigates components of workpiece positioning accuracy. The main purpose of AWPVS is to precisely identify the position and rotation of a workpiece placed on a waterjet machine table. Two webcams form a basis for the system, and constitute its characteristics. The proposed algorithm comprises various image processing techniques to assure a required...
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Computer-aided analysis of thermal convection near electric devices
PublicationObciążalność długotrwała urządzeń elektrycznych zależy od intensywności oddawania ciepła przez te urządzenia do otoczenia. Dla zwiększenia obciążalności długotrwałej urządzeń stosuje się konwekcję wymuszoną np. z wykorzystaniem wentylatorów. Wszechstronne obserwacje i analiza procesów konwekcji naturalnej wskazują, że jej intensyfikację można uzyskać dzięki umieszczaniu w pobliżu urządzenia oddającego ciepło elementów tworzących...
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Automatic sound source localization in disturbing conditions using acoustic vector sensors
PublicationA concept, practical realization and applications of a passive acoustic radar to automatic localization and tracking of sound sources in disturbing conditions were presented in the paper. The device consists of the new kind of multichannel miniature sound intensity sensors and a group of digital signal processing algorithms. The sensitivity of the realized acoustic radar was examined in free sound field. Several kinds of sound...
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Subjective and Objective Quality Evaluation Study of BPL -PLC Wired Medium
PublicationThis paper presents results of research on the effectiveness of bi-directional voice transmission in a 6 kV mine cable network using BPL-PLC (Broadband over Power Line - Power Line Communication) technology. It concerns both emergency cable state (supply outage with cable shorted at both ends) and loaded with distorted current waveforms. The narrowband (0.5 MHz–15 MHz) and broadband (two different modes, frequency range of 3 MHz–7.5...
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A Development of a Capacitive Voltage Divider for High Voltage Measurement as Part of a Combined Current and Voltage Sensor
PublicationThis article deals with the development of capacitive voltage divider for high voltage measurements and presents a method of analysis and optimization of its parameters. This divider is a part of a combined voltage and current sensor for measurements in high voltage power networks. The sensor allows continuous monitoring of the network distribution status and performs a quick diagnosis and location of possible network failures....
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Improving Control Dynamics of PMSM Drive by Estimating Zero-Delay Current Value
PublicationDynamic performance of current control loop still remains crucial for position-, speed-, and torque-controlled drives. In the study, a current loop solution has been designed for field oriented control of permanent magnet synchronous motors (PMSM). It enhances typical PI controller with an estimator of zero-delay current (ZDC) value. The ZDC estimation allows for selecting substantially higher controller gain. It reduces control...
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Spatial Distribution of Eucalyptus Plantation and its Impact on the Depletion of Groundwater Resources of Tehsil Swat Ranizai, District Malakand
PublicationNative to the continent of Australia, eucalyptus is a tall, evergreen tree belonging to the Myrtaceae family. Malakand district has the largest eucalyptus plantation in the province, covering an area of 22,071.29 ha. The present study aims to evaluate its impact on the groundwater table (GWT) in three selected union councils (UCs) of the study area, i.e., Agra, Totakan, and Kot. Both primary and secondary data support the study....
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Technika próżniowa_23/24
e-Learning CoursesTechnika próżniowa 5. sem. kier. FT, wydz. FTiMS, kier. FM, wydz. FTiMS
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Synthesis and properties of carboxy derivative of Epidian 6 monomethacrylate (in English)
PublicationWe present the synthesis of an oligomer with carboxy and methacrylic groups based on Epidian 6. The effect of the catalyst nature and amount, solvent nature and process temperature on the rate of the reaction between Epidian6 monomethacrylate and adipic acid was examined at 313, 323 and 333 K in the presence of 4-dimethylaminopyridine, 1,4-diazobicyclo[2.2.2]octane, and benzyltriammonium chloride. The synthesized oligomer was characterized...
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Dariusz Witt prof. dr hab. inż.
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Technika próżniowa_22/23
e-Learning CoursesTechnika próżniowa 5. sem. kier. FT, wydz. FTiMS 2. sem. kier. FM, wydz. FTiMS
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Signals of the 5G Standalone Radio Interface
Open Research DataThe research work conducted within the scope of NATO-STO (North Atlantic Treaty Organization – Science and Technology Organization) IST-187 group assumed investigation of the 5G gNodeB performance. The downlink (DL) signals of the FDD (Frequency Division Duplex) 5G-Standalone station were registered in isolated and controlled laboratory conditions....
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Emisyjność warstw tlenków lantanowo-strontowo-kobaltowych LSCO i lantanowo-strontowo-żelazowych LSFO praeznaczonych na bolometry
PublicationPrzedstawiono metodę pomiaru oraz wyniki pomiarów emisyjności grubych warstw niestechiometrycznych tlenków LSFO i LSCO. Duża emisyjność jest korzystna przy zastosowaniu tych warstw na detektory IR.
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Thermal decomposition of [Cd{SSi(OBut)3}(S2CNC4H8)]2 to CdS “micro-noodles”
PublicationThis work presents studies on thermal degradation of novel heteroleptic complex possessing mixed S-donor ligands, [Cd{SSi(OBut)3}(S2CNC4H8)]2 using TGA, DSC, TGA-IR, SEM and XRD methods.
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Raman spectra for pyrolized natural compounds
Open Research DataThe presented data showcases the results of Raman spectroscopy analysis conducted on pyrolyzed natural compounds both with and without the inclusion of graphene. The study delved into four specific compounds: methylcellulose with lysine (ML), methylcellulose with lysine-graphene composite (MLG), algae (A), and algae-graphene composite (AG). Raman spectra...
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Unique agreement of experimental and computational infrared spectroscopy: a case study of lithium bromide solvation in an important electrochemical solvent
PublicationInfrared (IR) spectroscopy is a widely used and invaluable tool in the studies of solvation phenomena in electrolyte solutions. Using state-of-the-art chemometric analysis of a spectral series measured in a concentration-dependent manner, the spectrum of the solute-affected solvent can be extracted, providing a detailed view of the structural and energetic states of the solvent molecules influenced by the solute. Concurrently,...
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Sources and fate of microplastics in marine and beach sediments of the Southern Baltic Sea—a preliminary study
PublicationMicroplastics’ sources and fate in marine bottom and beach sediments of strongly polluted Baltic Sea have been investigated.Microplastics were extracted using sodium chloride. Their qualitative identification was conducted using micro-Fourier-transform infrared spectroscopy (μFT-IR).
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Deposition and characterization of organic polymer thin films using a dielectric barrier discharge with different C2Hm/N2 (m = 2, 4, 6) gas mixtures
PublicationOrganic polymer thin films have been deposited on Si(100) and aluminum coated glass substrates by a dielectric barrier discharge (DBD) operated at medium pressure using different C2Hm/N2 (m = 2, 4, 6) gas mixtures. The deposited films were characterized by various spectroscopic techniques. Fourier transform infrared reflection absorption spectroscopy (FT-IRRAS) revealed the chemical functional groups present in the films. The surface...
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Metody Badań Structuralnych związków organicznych CH sem VI
e-Learning CoursesW ramach przedmiotu zostaną przedstawione spektroskopie NMR, IR, UV-vis oraz spektrometria mas jako metody analizy strukturalnej. Znaczny nacisk zostanie położony na interpretację widm oraz formułowanie wniosków o strukturze związków w oparciu o widma.
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Metody Badań Strukturalnych Zwiąków Organicznych
e-Learning CoursesW ramach przedmiotu zostaną przedstawione spektroskopie NMR, IR, UV-vis oraz spektrometria mas jako metody analizy strukturalnej. Znaczny nacisk zostanie położony na interpretację widm oraz formułowanie wniosków o strukturze związków w oparciu o widma.
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Change of exhaust gases concentration for SOFC fueled by H2 and biogas mixture at 750 C
Open Research DataThe dataset contains the Change of exhaust gases concentration for SOFC fueled by H2 (for 12h) and biogas mixture at 750 C (60:40 CH4:CO2). The outlet concentration of the gases from SOFC were measured using novel FTIR-based unit.
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Self-supporting LSFO films for bolometers made with LTCC technology
PublicationOpisano metodę wytwarzania przewodzących, tlenkowych warstw ceramicznych tlenków lantanowo-strontowo żelazowych (LSFO) technologią low temperature co-fired ceramics (LTCC). Przedstawiono rezultaty pomiarów parametrów warstw pod kątem przydatności do produkcji detektorów IR.
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LIDAR data from a survey conducted in the vicinity of the town of Lake Lednica
Open Research DataThe measurement data was obtained during research aimed at utilizing LiDAR observations to assess changes occurring in the shoreline of Lake Lednica. The collected information comes from a spatial survey conducted using a scanner mounted on an unmanned aerial vehicle (ALS, in the IR channel). This advanced measurement system allows for precise registration...
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2023/2024 Metody Badań Strukturalnych CHEMIA
e-Learning CoursesPrzyswojenie wiedzy w zakresie stosowania podstawowych metod spektralnych do analizy strukturalnej oraz praktycznej interpretacji widm IR, UV-VIS, 1H, 13C i 19F NMR, MS związków organicznych
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Metody Badań Strukturalnych - laboratorium
e-Learning CoursesKurs zawiera materiały do laboratorium z Metod Badań Strukturalnych dla studentów kierunku Chemia (studia I stopnia) semestru II (semestr letni) i składa się ze zbioru widm NMR, IR, MS i widm złożonych do samodzielnego rozwiązywania
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2023/2024 Metody Badań Strukturalnych TECHNOLOGIA CHEMICZNA
e-Learning CoursesPrzyswojenie wiedzy w zakresie stosowania podstawowych metod spektralnych do analizy strukturalnej oraz praktycznej interpretacji widm IR, UV-VIS, 1H, 13C i 19F NMR, MS związków organicznych
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Thermal analysis of manganese(II) complexes of general formula (Bu4N)2[MnBrnCl4−n]
PublicationBadano termiczną dekompozycję związków zawierających aniony tetrahalogenomanganese(II), [MnBrnCl4−n]2−(n = 0-4) i kationy tetrabutylammonium. Stosowane metody to: DSC, TG-FTIR, TG-MS i DTA. Pomiary prowadzono w argonie i powietrzu w zakresie temperatur 173-450K (DSC) i 300-1073K (TG). Stałe produkty dekompozycji identyfikowano metodami spektroskopii FT-FIR i dyfraktometrii rentgenowskiej.
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Jakub Konkol dr inż.
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Tick-borne encephalitis – lipid peroxidation and its consequences
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ALIS-FLP: amplified ligation selected fragment-length polymorphism method for microbial genotyping
PublicationA DNA fingerprinting method known as ALIS-FLP (amplified ligation selected fragment-length polymorphism) has been developed for selective and specific amplification of restriction fragments from TspRI restriction endonuclease digested genomic DNA. The method is similar to AFLP, but differs in that only one specific restriction enzyme (TspRI) is used. The cohesive ends of the DNA fragments are ligated with two types of oligonucleotide....
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Arterial stiffness, body fat compartments, central hemodynamics, renal function and left atrial size
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Fibrinogen and d-dimer in contrasting relation with measures of wave reflection and arterial stiffness
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Critical review of propeller performance scaling methods based on model experiments and numerical calculations
PublicationThe article presents the results of experimental and theoretical investigation of propeller scale effects. The objective of this investigation is to test the adequacy of the methods currently used and to develop possible improvement of the methods.New approaches to the problem and new procedures to account for the propeller scale effects are suggested. The description of the underlying experimental and theoretical research is included.
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Synthesis and structure of Dicyclohexylammonium Tri-tert-pentoxysilanethiolate and 5-aminopentylammonium Tri-tert-pentoxysilanethiolate
PublicationTri-tert-pentoksysilanotiol reaguje z dicykloheksyloaminą i 1,5-diaminopentanem dając odpowiednie sole amoniowe. Sole te scharakteryzowano poprzez analizę elementarną, widma IR i NMR oraz metodą rentgenowskiej analizy strukturalnej. Są to pierwsze pochodne tri-tert-pentoksysilanotiolu, dla których wyznaczono strukturę krystaliczną.
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Monitoring of odour nuisance in the Tricity Agglomeration
PublicationThe paper describes a principle of operation of odour nuisance monitoring network, which is being designed in the Tricity Agglomeration. Moreover, it presents the preliminary results of an investigation on ambient air quality with respect to odour nuisance in a vicinity of the municipal landfill. The investigation was performed during spring-winter season using a prototype of electronic nose and the Nasal Ranger field olfactometers. The...
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Comparison of the measurement techniques employed for evaluation of ambient air odour quality
PublicationThe paper presents the results of investigation on ambient air odour quality in a vicinity of the industrial sewage treatment plant being a part of the crude oil processing plant. The investigation was performed during spring-winter season using a prototype of electronic nose and the Nasal Ranger field olfactometers. The prototype was equipped with a set of six semiconductor sensors by FIGARO Co. and one PID-type sensor. The field...
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Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a UWB Signal
PublicationPublikacja przedstawia opis stanowiska laboratoryjnego użytego do badania wpływu zakłóceń impulsowych na jakość odbioru sygnałów wąskopasmowych. Przedstawione zostały przykładowe wyniki pomiaru jakości transmisji wąskopasmowych wraz z wykazaniem, że modyfikacja widma zakłócającego sygnału IR UWB powoduje poprawę jakości odbioru sygnałów wąskopasmowych.
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Effects of consecutive apneas on pial artery pulsation and subarachnoid width in healthy subjects
PublicationHypercapnia is known to dilate the pial artery, disrupt cerebral autoregulation and increase pial artery pulsation. The cerebral blood flow velocity (CBFV) response to hypercapnia is biphasic. Below the threshold for the increase of blood pressure (BP) with carbon dioxide partial pressure (pCO2), the CBFV measurement reflects vascular reactivity to pCO2 alone at a constant BP. Above this threshold, the CBFV measurement provides...
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Sano-Tachiya-Noolandi-Hong versus Onsager modelling of charge photogeneration in organic solids
PublicationW pracy obliczono numerycznie charakterystyki polowe wydajności fotogeneracji nośników ładunku na gruncie różnych wesrsji modeli Onsagera i Noolandiego-Honga. Wyznaczone krzywe teoretyczne porównano z wynikami doświadczalnymi uzyskanymi metodą elektromodulacji (foto)luminescencji (EML) dla próżniowo naparowanych warstw organicznych kompleksów Alq3 i Ir(ppy)3.
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Electroabsorption study of metal-to-ligand charge transfer in an organic complex of iridium (III).
PublicationW pracy zmierzono i zinterpretowano widmo elektroabsorpcji (EA) próżniowo naparowanych warstw organicznego kompleksu Ir(ppy)3, powszechnie stosowanego jako emiter fosforescencyjny w organicznych diodach elektroluminescencyjnych. Analiza widma EA potwierdziła fakt,że niskoenergetyczne stany elektronowe tego kompleksu związane są z przeniesieniem ładunku metal-ligand.
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X-ray diffraction spectra of the NiCo2O4 modified by carbon
Open Research DataThis dataset comprises XRD results for NiCo2O4 modified with carbon, varying according to the amount of carbon. In this context, the XRD data provide insights into the crystalline structure and phase composition of the NiCo2O4 material as it is modified with varying quantities of carbon. This investigation is valuable for understanding how the presence...
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A novel nucleotide found in human erythrocytes, 4-pyridone-3-carboxamide-1-beta-D-ribonucleoside triphosphate
PublicationZidentyfikowano nowy, nieznany nukleotyd, występujący w erytrocytach osób chorych na przewlekłą niewydolność nerek, w stężeniu porównywalnym do zawartości ATP. Nukleotyd ten wyizolowano chromatograficznie, a jego strukturę określono jako trójfosforan 4-piridono-3-karboksyamido-1-b-D-rybonukleozydu, na podstawie danych spektralnych UV, MS, IR i NMR.
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Diaminophosphinoboranes: effective reagents for phosphinoboration of CO2
PublicationThe monomeric diaminophosphinoboranes readily react with CO2 under mild conditions to cleanly form products of the general formula R2P-C(=O)-O-B(NR2)2 in the absence of a catalyst. The isolated products from the CO2-phosphinoboration were fully characterized by NMR spectroscopy, IR spectroscopy, and X-ray diffraction. The mechanism of CO2 phosphinoboration with diaminophosphinoboranes was elucidated by DFT calculations.
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Diamond Structures for Tuning of the Finesse Coefficient of Photonic Devices
PublicationFinesse coefficient is one of the most important parameters describing the properties of a resonant cavity. In this research, a mathematical investigation of the application of diamond structures in a fiber-optic Fabry–Perot measurement head to assess their impact on the finesse coefficient is proposed. We present modeled transmission functions of cavities utilizing a nitrogen-doped diamond, a boron-doped diamond, nanocrystalline...
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Electrochemical studies of poly(lactic acid)-carbon black-nanodiamond composites
Open Research DataThis dataset contains electrochemical investigation on electrodes 3D printed using a new composite composed of poly-lactic acid (PLA), carbon black (CB) and nanodiamond fillers. Two types of nanodiamonds were studied: detonation nanodiamonds (DND) and boron-doped carbon nanowalls (BCNW). The presented results contain:1. electrochemical characterisation...
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Narrowband Transmission Quality in Presence of Modified IEEE 802.15.4a UWB Signal
PublicationThis paper presents results of measurement of narrowband transmission quality in presence of impulse radio UWB interference. In the first part of paper, unmodified IEEE 802.15.4a IR UWB signal is used. Then some modification of transmitted pulse sequence is proposed, which allow to reduce UWB power spectral density at frequency of narrowbandtransmission. Finally narrowband transmission quality in presence of modified ultrawideband...
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Magetic field effects on organic electrophosphorescence.
PublicationPo raz pierwszy zarejestrowano kilkuprocentowy wzrost kwantowej wydajności elektroluminescencji (EL) w diodach z emiterami fosforescencyjnymi Ir(ppy)3 i PtOEP umieszczonymi w zewnętrznym polu magnetycznym. Zaobserwowane zmiany wyjaśniono na podstawie magnetycznej modulacji oddziaływań nadsubtelnych powodujących wzajemną konwersję singletowych i trypletowych skorelowanych par elektron-dziura (e-h).