Journal of Engineering & Processing Management (EPM)
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SEPARATION AND RETENTION BEHAVIOUR OF BENZIMIDAZOLE DERIVATIVES IN THIN LAYER CHROMATOGRAPHY ON SILICA GEL
No full textThe separation ability and retention behaviour of normal phase TLC on silica with eight nonaqueous eluents, has been studied by measuring the retention constants of a series of synthesized benzimidazoles. The separation ability and retention behaviour are discussed in terms of the nature of the solute and eluent
WASTE COPPER USAGE FOR PLANT FUNGICIDE PRODUCTION
No full textCopper Oxyl Chloride 3Cu (OH)2∙CuCl2 is dual salt of copper, chlorine, oxygen and water. It is light green salt without smell. In water and organic solutions it is insoluble while it is easily solluble in acids. It is solluble in ammonia thus building complex units. It is more instable product since it is soluted after longer exposure to air and moist. Most common use is for plant protection (it can be used as dust, oil or water suspension). There are various ways and patents to produce it. These technologies are mainly similar but each manufacturer starts from different base: copper or its salts, chlorides of alkaly metals oxidating with air exposure
INFLUENCE OF TEMPERATURE AND DIFFERENT METHODS OF THERMAL PROCESSING TO COLOR CHANGES AND SENSORY CHARACTERISTICS OF PORK MEAT
No full textMeat is very important ingredients in the human diet, so it is a source of easily digestible, biological and energy valuable components. Therefore, this paper investigate the influence of temperature in the temperature range from 51°C to 100°C and different methods of thermal processing, thermal treatment by cooking and roasting, to change the color and sensory characteristics of pork meat. As parameters to change the color on the surface of the treated samples, were measured L* a* and b* value in CIE L*a*b* system. Sensory properties were evaluated juiciness, tenderness, amount of connective tissue and aroma. This research showed that thermal treatment of roasting has a more intense effect on the change of parameters L* a* and b*, while cooking thermal treatment more intensive affects the change of sensory qualities
EFFICIENT USE OF SOLAR ENERGY RECEIVERS WITH LIQUID AND AIR AS HEAT CARRIERS
No full textReduction of fossil - iscrpljivih, but also non-renewable, fuels and increased concentrations of greenhouse gases on a global scale, have led to rapid development of alternative energy sources, resulting in the use of solar energy occupies an important role in the production of energy from renewable sources. The paper presents the system and method of absorption of solar energy collectors koncetrišućim, and its application in the world every year become more pronounced. The fact that it will be this way until the year 2040 to produce about 20% of world electricity consumption, additionally imposes the requirement that the method of obtaining energy special attention, especially because of the fact that it is less - more, this resource available to all parts of planet
THE QUALITY OF COFFEE THAT IS PREPARED AND CONSUMED IN THE TRADITIONAL WAY
No full textCoffee is one of the most popular beverages worldwide. Consumption of black coffee brew, which is prepared in traditional way is characteristic for this region. Consumer expectations in terms of quality and sensory characteristics of beverages can significantly affect on the acceptability of coffee. The aim of this study was to investigate the quality of roasted ground coffee, that is offered on market (as single sort of coffee and commercial coffee blends) and used for the coffee brews preparation in the traditional way. In order to define the quality of these products, basic chemical composition of roasted coffee samples was tested and the degree of roasting coffee based on the value of the color parameters measured instrumentally was determined. Color, taste, aroma and body of brews prepared from the coffee samples were determined by sensory analysis. Based on the results of chemical analysis of coffee samples, it was found that the quality of the product is in accordance with legislation. Instrumental measurement of color showed that tested coffee samples were dark and medium roasted. Coffee brews were evaluated with relatively high scores for selected sensory properties, depending on the condition of roasting and quality of samples. Color of coffee brew was bright and or characteristic, taste was expressive or characteristic, aroma was characteristic, expressive or very expressive and body of brew was expressive. Coffee brew should have a recognizable body and pleasent aroma. The results of the sensory analysis of the samples showed that black coffee brew quality depends on the degree of roasting, species and sorts of coffee. Based on results from testing of commercial coffee samples quality, it can be concluded that the expected quality coffee brew with specific and pleasent sensory properties and composition can be obtained by proper choice of species and sorts of coffee, their ratio in the blends and continuous control of roasting process and the quality of the product
MINERAL SUBSTANCES IN SUGAR BEET MOLASSES
No full textMolasses, a byproduct of the sugar industry, presents multicomponent system of complex chemical composition and a suitable raw material for a range of food technology. The composition of molasses is conditioned by the sugar beet quality, applied beet processing technology and used aids. The main parts of molasses consists carbohydrates, primarily sucrose. Significant percentage of nonsucroses presents the compounds whose qualitative and quantitative composition is essential for estimation the benefits of molasses as a raw material in the processing and fermentation industries. Non sucrose molasses substances are divided into inorganic (mineral) compounds, organic compounds with nitrogen and organic compounds without nitrogen. The research work has dealt with ivestigations of molasses mineral substances, which was produced in the sugar beet processing of Serbian factories. The analysis included the impact of the processing conditions on content and composition of molasses nonsucrose substances
ANALYSIS QUALITY SOIL FROM THE ASPECT OF APPLICATION SIMULTANEOUS POTENTIOMETRIC STRIPPING ANALYSIS
No full textThe research described in this paper is directed towards the development and application of simultaneous potentiometric stripping analysis for the determination of heavy metals (lead, cadmium and zinc) in the soil of the northern part of the territory of Kosovo and Metohija. The experiments were carried out: I) the module solution (prepared from standard solutions of metal working and deionized water), II) in the soil samples. The selected two types of land: agricultural (location next to the road in the vicinity of industrial areas) and non-agricultural (parks and playgrounds). To that end are analyzed, compared and separated optimum parameters: The working electrode is formed by depositing layer of mercury on glassy carbon with a constant stream of -49.90 µA, pH 1.6 and time deposit with a 240 s from a solution of mercury(II) nitrate. The extracting of metals from solution was performed at pH 2.1 and the potential of -1.400 V. Soil samples are after the drying, homogenisation and sifting translated in solution by dissolving with concentrated nitric and hydrochloric acid. The results of this study revealed are deviations for: lead -4.58%, cadmium -1.91% and zinc -1.89%. Was found that landfills mining Kombinat Trepca have a significant influence on the quality of the soil. Was found that mining landfills of Trepca have a significant influence on the quality of the soil. The highest content of investigated metals were found in soils in the immediate proximity passive and active mining landfills. Content of investigated elements, on almost all measuring places along the road, have had values above the maximum allowable
ANALYSIS OF BUSINESS ENVIRONMENT AND BARRIERS
No full textThis paper presents the results of tests perception of business environment and barriers to business by attitudes of entrepreneurs in local communities. It is well known that general region of the Balkan countries, is faced with the problem of the lack of investment as well as domestic and foreign direct investment. One of the major causes of course, are important obstacles in business that affect the negative perception of the business environment in the region. For this reason, there are a number of activities organized by local communities but also higher levels of government in order to implement the entire projects as well as measures to create a favorable business frinedly environment and create of the competitive area of business in relation to the neighboring countries
PHOTO CHROMATIC SENSORS OF MULTINARY MIXED VALENCE INORGANIC MICRO NEEDLES
Full text linkThe recent I-U measurements on the individual micro needle-shaped crystals, of the ternary mixed valence compound In5Se5Cl, crystallizing in the monoclinic crystal system (P21/m), showed significant light sensitivities. Micro needles of In5Se5Cl “glued” on Si- and Cu- substrates were measured under five different wavelengths with various irradiation intensities to investigate their photo chromatic sensing behavior along with the substrate’s influence. In the measuring voltage range 0 – 3 V and maximal LED illumination intensity, current jumps above two orders of magnitude were observed for white light (4100 K; 200 lm), followed by the blue light (460 nm; 976 mW). The amber light (590 nm; 203 mW) exhibited the lowest response. Green- and blue light were selected to determine the substrate’s effect. The micro-needles chips prepared with Si-substrates displayed higher currents for the same voltages in comparison to those prepared with Cusubstrates. These differences decreased with the voltage increase for both employed wavelengths. The mutual structural substitution of a selenium with sulfur, led to the compound In5Se4Cl. The later crystallizes similarly to In5Se5Cl. Its I-U measurements recorded with green and blue light, on Cu-substrate chips within the voltage range 0 -3 V, revealed more pronounced photo chromatic sensorial for both wavelengths used. These differences increased with the voltage increase for both employed wavelengths. At 3 V, current increases up to 2.2 times and 2.4 times were observed for the green light and blue light respectively. Typically high and better distinguishable sensorial activity was observed for all the employed wavelengths using chips with In5Se4Cl crystals on Cu-substrate, even at minimal irradiation LED power (0.25 %). The micro-reflection measurements of both needle-shaped crystals displayed a substitution dependent band-gap. For In5Se5Cl the band gap was estimated at 580 nm. Thickness interference oscillations strongly damped due to structural inhomogeneity or defect-related absorption suggest two possible band gaps for In5Se4Cl; at 540 nm or at 620 nm
PREDICTION MODELS OF NON-FERROUS SECONDARY RAW MATERIALS FORMATION
No full textFor the prediction of formation of non-ferrous processing and accumulating waste both model of balancing and model of correlation and regression analysis can be employed, while the dynamic model can be applied only for the accumulating waste. Estimates of the formation of certain type of metallic secondary raw materials in model of balancing are based on data of production and consumption of metals and on the numerical values of the waste formation coefficients. Applying of correlation and regression analysis method on the assessment of metallic waste formation is based on finding the functional dependence between the creation of metallic waste and quantity of waste on the input stream of processing as well as correlation with metal fund for accumulation waste. The dynamic model are linking the effect of the products materials content and design on the amount of the quantity of the used products which are recycled over time, including various external influential factors