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Search results for: GELLING PROPERTIES
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CLAY MINERALS – MINERALOGY AND PHENOMENON OF CLAY SWELLING IN OIL & GAS INDUSTRY
PublicationAmong the minerals found in the earth's crust, clay minerals are of the widest interest. Due to the specific properties such as plasticity, absorbing and catalytic properties clay minerals are used in many industries (oil & gas, chemistry, pharmacy, refractory technology, ceramics etc.). In drilling, a phenomenon of swelling clays is frequently observed. It has an important impact on the cementing quality. During the last few decades...
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Active Dynamic Thermography imaging of wound healing processes in cardio surgery
PublicationThe surgery is a branch of medicine, that is integrally connected to wounds. Despite using sterile tools and compliance with aseptic rolls, some of the surgery wounds become infected. In clinical practice there is a lack of cheap, objective methods and tools for quantitative definition and estimation of the surgery wound healing progress. This paper presents preliminary results of Active Dynamic Thermography (ADT) parametric imaging...
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Rolling resistance and tyre/road noise on rubberised asphalt pavement in Poland
PublicationThe paper presents results of tyre/road noise and rolling resistance measurements performed on stone mastics asphalt (SMA) that contains rubberised asphalt, developed and produced by a refinery in Poland. Bituminous binder was modified with polymer and addition of crumb rubber. The first observations of asphalt mixture with the new kind of modified bitumen used on the field section are presented. Rolling resistance of passenger...
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TIRE/ROAD NOISE AND TIRE ROLLING RESISTANCE ON PROTOTYPE PERS SURFACE
PublicationPoroelastic road surfaces are characterized by low noise of tires running on them.Road pavements of this type are promising solution to problems related to traffic noise in cities and on rural roads. Some technical problems still have to be solved, in particular regarding durability and skid resistance on wet surface. Ongoing and planned works are to contribute to create a quiet, durable and safe road surface, which will become...
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Study of the influence of thermal factors on the welding process of polyethylene gas pipelines,
PublicationA one-dimensional calculation scheme is proposed with the help of which it is possible to determine and set the technological parameters with the accuracy to be realized in production conditions: the temperature of the heating element and the heating time, which allows maximum mechanization of the technological operations of polyethylene gas pipelines welding. The numerical value of the coefficient of temperature for polyethylene...
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Underwater Wet Repair Welding of API 5L X65M Pipeline Steel
PublicationThis paper presents results of the research of effect of polymer insulation of pipeline made of API 5L X65M steel as well as underwater wet welding parameters on properties of joints made by covered electrodes. Effect of heat input on structure and hardness of joints during repair of underwater pipeline was analyzed. Welding defects like microcracks, micro-lacks of fusion, slag inclusions, as well as HAZ hardness increase over...
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Modelling and Simulation of a New Variable Stiffness Holder for Milling of Flexible Details
PublicationModern industry expectations in terms of milling operations often demand the milling of the flexible details by using slender ball-end tools. This is a difficult task because of possible vibration occurrence. Due to existence of certain conditions (small depths of cutting, regeneration phenomena), cutting process may become unstable and self-excited chatter vibration may appear. Frequency of the chatter vibration is close to dominant...
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Laser Dissimilar Welding of AISI 430F and AISI 304 Stainless Steels
PublicationA dissimilar autogenous laser welded joint of AISI 430F (X12CrMoS17) martensitic stainless steel and AISI 304 (X5CrNi18-10) austenitic stainless steel was manufactured. The welded joint was examined by non-destructive visual testing and destructive testing by macro- and microscopic examination and hardness measurements. With reference to the ISO 13919-1 standard the welded joint was characterized by C level, due to the gas pores...
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Beyond quid pro quo: good soldiers and characteristics of their helping behaviours
PublicationPurpose – Good soldiers are people who engage in citizenship behaviours “to do good” instead of “to look good”. The purpose of this article is to explore the motivations behind and the specific characteristics of behaviours of the good soldiers in the context of work using social exchange theory (SET) as a theoretical framework. Design/methodology/approach – 47 dyadic interviews with 94 individuals from three organisations...
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The Method of Finding the Optimal Spindle Speed When Milling Flexible Details
PublicationThe paper presents a new method of vibration reduction during milling of flexible details. The method consists in selecting the optimal spindle speed, based on the natural frequency of the workpiece. For this purpose, an original method was created, which is based on minimizing the work of cutting forces in the direction of the depth of cutting. The effectiveness of the method has been proved by comparing the RMS values of vibration...
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Exploring DAD and ADD Methods for Dealing with Urban Heat Island Effect
PublicationThe Urban Heat Island (UHI) effect in the context of climate change and temperature fluctuations is an increasing challenge for contemporary cities. Numerous activities focus on mitigation and adaptation to the UHI effect using both appropriately selected design strategies and technological solutions. However, not all of these technologies support the postulates of ecological and low-carbon cities. Their design, implementation,...
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Evaluating Gelatin-Based Films with Graphene Nanoparticles for Wound Healing Applications
PublicationIn this study, gelatin-based films containing graphene nanoparticles were obtained. Nanoparticles were taken from four chosen commercial graphene nanoplatelets with different surface areas, such as 150 m2/g, 300 m2/g, 500 m2/g, and 750 m2/g, obtained in different conditions. Their morphology was observed using SEM with STEM mode; porosity, Raman spectra and elemental analysis were checked; and biological properties, such as hemolysis...
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Exploring the trends in flux-cored arc welding: scientometric analysis approach
PublicationFlux-cored arc welding (FCAW) is a universal group of welding methods in terms of the scope of application and automation possibilities, the share of which in various industries in many countries is still increasing. The paper presents the results of bibliographic analyses (scientometric analysis with the use of VOSviewer, Bibliometrix and CitNetExplorer tools) of a data set of 993 publications indexed in the Web of Science database...
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Green and sustainable hydrogels based on quaternized chitosan to enhance wound healing
PublicationHydrogel-based biomaterials applied as wound dressings provide the wound with a moist environment, which facilitates tissue regeneration through granulation and re-epithelialization. The inherent flexibility and adjustable architecture of hydrogels enables incorporation of cells, antimicrobial drugs, growth factors, and bioactive compounds, which leads to expediting wound contraction and enhancing the regeneration process. The...
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Effect of bulk solid on strength of cylindrical corrugated silos during filling.
PublicationW artykule przedstawiono wyniki MES dla metalowych silosów z blachy falistej o kształcie cylindrycznym. Obliczenia wykonano podczas stanu napełnienia silosów z uwzględnieniem materiału sypkiego. Materiały sypki został opisany hipoplastycznym modelem konstytutywnym. W obliczeniach wzięto pod uwagę wstępne imperfekcje geometryczne. Wyniki porównano dla silosów pustych. Zaobserwowano pozytywny efekt obecności materiału sypkiego.
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Rheological properties of lipids
PublicationPrzedstawiono ocenę systemów żywności ze szczególnym uwzględnieniem zawarto-ści w nich lipidów, pod względem ich właściwości reologicznych. Opisano kil-ka schematów dotyczących przewidywanego rozkładu sił, a także rodzaju przep-ływu, opisujących możliwości pomiaru właściwości w tych strukturach dla róż-norodnych produktów żywnościowych o zróżnicowanej zawartości tego składnika.
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Lipopeptides - synthesis and their properties
PublicationZaprezentowano syntezę nowych pochodnych tripeptydu Gly-Hyp-Lys o potencjalnie lepszych właściwościach lipofilowych. Modyfikacje polegały na acylowaniu N-końca glicyny kwasami tłuszczowymi (np. palmitynowym i stearynowym). Syntezę lipopeptydów zawierających fragment Gly-X-Y (gdzie: X= Met,Hyp,Hyp-Met,Gly-Hyp; Y=Lys,D-Lys) przeprowadzono na fazie stałej z zastosowaniem procedury Fmoc. Do wydłużanie łańcucha peptydowego zastosowano...
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Tuftsin-Properties and Analogs
PublicationImmunomodulation is one of the significant therapeutic strategies. It includes both stimulation or suppression of the immune system by a variety of substances called immunomodulators, designed to regulate the immune response of the organism to infections of varying etiology. An example of such a substance is tuftsin (TKPA) 3 (Fig. (1)). Tuftsin is an endogenous immunomodulator of a wide spectrum of biological activity. Tetrapeptide...
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Mechanical Properties of Implants
PublicationW pracy przedstawiono wyniki identyfikacji ortogonalnego modelu matematycznego czterech typów implantów stosowanych w laparoskopowym leczeniu przepukliny brzusznej.
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Lipopeptides - synthesis and their properties
PublicationPrzedstawiono syntezę nowych peptydów zawierających Hyp, Met, Gly podstawionych w miejscu histydyny tripeptydu o sekwencji Gly-His-Lys oraz ich odpowiednie modyfikacje na N- i C-końcach. Syntezę zaprojektowanych analogów prowadzono na fazie stałej z zastosowaniem procedury Fmoc. Po otrzymaniu zaplanowanego łańcucha peptydowego metodą karbodiimidową (z zastosowaniem DIC oraz HOBt), przystąpiono do wprowadzania na N-koniec glicyny...
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Structure and thermoelectric properties of Cs-Bi-Te alloys fabricated by different routes of reduction of oxide reagents
PublicationCesium-bismuth-telluride polycrystalline materials were fabricated using a cost-effective method based on a reduction of oxide reagents, leading to a production of a material with good thermoelectric properties. Several samples with various initial stoichiometry were prepared by melting of oxide powders at 1050 °C, quenching, milling to powders and then reducing in pure hydrogen at 400 °C. Another concept was to obtain the CsBi4Te6...
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Design and characteristics of gellan gum beads for modified release of meloxicam
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Delving into the Nutraceutical Benefits of Purple Carrot against Metabolic Syndrome and Cancer: A Review
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Evaluation of inverted pavement by structural condition indicators from falling weight deflectometer
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The Biocompatibility and Self-Healing Effect of a Biopolymer’s Coating on Zn Alloy for Biomedical Applications
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Multivariate evaluation by quality indicators of no-tillage system in Argiudolls of rolling pampa (Argentina)
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The operational method of filling information gaps in satellite imagery using numerical models
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Football, Conservative Values, and a Feeling of Oneness with the Group: A Study of Polish Football Fandom
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Numerical modelling of asymetric double-layer Al-Cu plate rolling process
PublicationNiekorzystnym zjawiskiem towarzyszącym procesom walcowania płaskich wyrobów bimetalowych jest krzywizna pasma na wyjściu z kotliny walcowniczej wynikająca z nierównomierności odkształcenia warstw bimetalowej blachy. Możliwość szybkiego i łatwego przeciwdziałania temu zjawisku daje wprowadzenie asymetrii prędkości bądź średnic walców roboczych. W przedstawionym artykule zaprezentowano badania komputerowe procesu walcowania blach...
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Vibration surveillance of high speed ball end milling by the spindle speed control
PublicationPrzedstawiono zmodyfikowaną metodę nadzorowania drgań smukłych wirujących narzedzi skrawających za pomocą sterowania optymalno-liniowego prędkością obrotową wrzeciona. Podano opis dynamiki skrawania, niestacjonarnego modelu obliczeniowego oraz zmodyfikowanej metody nadzorowania drgań. Modyfikacja polega na tym, że do symulacji procesu nadzorowania wykorzystano model modalny freza, zaś parametry tego modelu wyznaczono albo numerycznie,...
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Modelling and simulation of vibration surveillance during ball end milling of flexible details
PublicationPraca dotyczy nadzorowania drgań w procesie frezowania szybkościowego przedmiotów podatnych za pomocą doboru optymalnej prędkości obrotowej wrzeciona. W niestacjonarnym układzie drgającym modelowanym dyskretnie wyodrębniono podukład modalny, podukład strukturalny oraz podukład łączący. Dynamikę procesu skrawania opisano we współrzędnych hybrydowych, przez co uzyskano znacznie mniejszy rząd niż w przypadku modelu strukturalnego....
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Hybrid Numerical-Analytical Approach for Force Prediction in End Milling of 42CrMo4 Steel
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The Influence of Tool Wear on the Vibrations During Ball end Milling of Hardened Steel
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Surface texture generation during cylindrical milling in the aspect of cutting force variations
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Mechanical and technological aspects of micro ball end milling with various tool inclinations
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Precision surface characterization for finish cylindrical milling with dynamic tool displacements model
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Structural studies and melting of bismuth nanocrystals in reduced bismuthgermanate and bismuth silicate glasses.
PublicationOtrzymano nanostruktury krystalicznego bizmutu w matrycy XO2 (X=Si,Ge) oraz warstwę nanostruktur krystalicznego bizmutu na powierzchni redukowanych w atmosferze wodoru szkieł Bi0.33Ge0.67O1.84 i Bi0.57Si0.43O1.72. Kompozyt Bi-szkło badano metodą DSC, XRD oraz AFM. Zaobserwowano zmniejszenie temperatury topnienia nanokrystalicznego bizmutu znajdującego się w matrycy szkła z 544 K do 387 K oraz do 502 K w przypadku powierzchniowej...
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Experimental validation of the rolling resistance measurement method including updated draft standard
PublicationThe main objective of ROSANNE is the harmonisation and standardisation of the measurement of skid resistance, noise emission and rolling resistance of road pavements. Regarding rolling resistance characterisation, a draft for standardization of a harmonized procedure for classification of road surfaces across Europe has been prepared within WP3 (deliverable 3.5). The procedure deals with the direct measurement on real roads of...
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Storage of High-Strength Steel Flux-Cored Welding Wires in Urbanized Areas
PublicationThe condition of the consumables is a key factor determining the waste reduction in the welding processes and the quality of the welded joint. The paper presents the results of tests of four types of fux-cored wires dedicated for welding high-strength steels, stored for 1 month and 6 months in Poland in two urbanized areas: in a large seaside city (Gdańsk) and in Warsaw, located in the center of the country. The wires were subjected...
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Determination of t8/5 cooling times for underwater local dry welding of steel
PublicationKnowledge of thermal history is the basic condition for studying the structure - properties of welded joints. The determinant of thermal history is the thermal cycle, whose in-situ measurements are still a big challenge. Water as the welding environment complicates this issue even more. The article presents a method to determine an equation for calculating t8/5 cooling times for underwater gas metal arc welding of unalloyed steels...
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Ball milling treatment of Mn3O4 regulates electron transfer pathway for peroxymonosulfate activation
PublicationHeterogeneous metal catalysts have attracted considerable interest in advanced oxidation processes (AOPs) for wastewater treatment by activating peroxymonosulfate (PMS). However, it remains challenging to the rational design of efficient reaction pathway for high-performance contaminants removal by regulating the inherent structure of metal oxides. Herein, a high-energy ball milling method was employed to modulate the electronic...
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Wady powierzchniowe ceramicznych elementów tocznych = Surface cracks of ceramic rolling elements
PublicationMateriały ceramiczne posiadają kombinację optymalnych własności, które są niezbędne w zastosowaniach na wysoko obciążone elementy maszyn. Podstawowym problemem związanym z wytrzymałością zmęczeniową materiałów ceramicznych są wszelkiego rodzaju wady powierzchniowe będące efektem procesu wytwarzania lub wynikające z defektów struktury materiału ceramicznego. W artykule przedstawiono badania doświadczalne dwutlenku cyrkonu ze sztucznie...
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Transient torsional vibrations control in the geared drive trains of the hot rolling mills
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Experimental Study of the Rolling Friction Coefficient in Highly Loaded Supports of Rotary Kilns
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Mapping Mechanostable Pulling Geometries of a Therapeutic Anticalin/CTLA-4 Protein Complex
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VIBRATION SURVEILLANCE DURING MILLING OF FLEXIBLE DETAILS WITH A USE OF THE ACTIVE OPTIMAL CONTROL
PublicationThe main goal of modern machining operations is to achieve increasingly better performance. High Speed Machining and/or High Performance Cutting, despite a lot of advantages, have also some drawbacks, for example, a possibility of losing stability and development of self-excited chatter vibration. This paper presents an approach of vibration surveillance during high speed milling with a use of active optimal control. Non-stationary...
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Dual fuelling of truck CI engine with diesel oil and mixture of propane and butane
PublicationW artykule przedstawiono zasadę działania dwupaliwowego zasilania jednocześnie olejem napędowym i odparowanym LPG silnika samochodu ciężarowego. Pokazano korzyści wynikające ze zużycia tańszego paliwa zbadane doświadczalnie.
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Vibration surveillance for efficient milling of flexible details fixed in adjustable stiffness holder
PublicationThe paper presents the results of research related to the possibility of using an intelligent workpiece holder with adjustable stiffness, during end milling process. Machining a one side supported flexible workpiece will be performed with constant spindle speed and feed speed. In order to avoid hazardous vibration, stiffness of the especially designed spring (mounted in a workpiece holder) will be modified off-line. In order to...
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Self-healing mechanism of metallopolymers investigated by QM/MM simulations and Raman spectroscopy
PublicationThe thermally induced self-healing mechanisms in metallopolymers based on bisterpyridine complexes of iron(II) sulfate and cadmium(II) bromide, respectively, were studied by means of combined quantum mechanical/molecular mechanical (QM/MM) simulations and Raman spectroscopy. Two possible healing schemes, one based on a decomplexation of the cross-linking complexes and a second one relying on the dissociation of ionic clusters,...
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Bead-on-plate welding on S235JR steel by underwater local dry chamber process
PublicationThe article presents the results of the effect of parameters of underwater local dry chamber welding on the properties of padding welds. The effect of heat input and the type of shielding gas on the structure and hardness of welds was established. the functions for estimating the maximum hardness of the heat affected zone have been also elaborated.