Вимірювальна техніка та метрологія

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Author: search.filters.author.Мідик, Ігор

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    Дослідження електричної та математичної моделі контролю якості овочів
    (Видавництво Львівської політехніки, 2016) Мідик, Ігор; Чабан, Олеся; Національний університет “Львівська політехніка”; Львівський національний медичний університет імені Данила Галицького
    Складено електричну та математичну модель контролю якості об’єктів неелектричної природи, враховуючи відомі сьогодні прототипи та результати проведених експериментальних досліджень зміни активної та реактивної складових провідності (адмітансу) в частотному діапазоні тестового сигналу. Проведено математичне моделювання складових адмітансу в разі зміни ємності приелектродного шару, опору та ємності об’єкта неелектричної природи у частотному діапазоні тестового сигналу. Опрацьовано отримані результати зміни активної та реактивної складових провідності, подано рекомендації щодо оптимального частотного діапазону проведення вимірювань та особливостей конструктивних елементів електричної моделі контролю якості об’єктів неелектричної природи. Составлено электрическую и математическую модели контроля качества объектов неэлектрической природы, учитывая известные сегодня прототипы и результаты проведенных экспериментальных исследований изменения активной и реактивной составляющих проводимости (адмитансу) в частотном диапазоне тестового сигнала. Проведено математическое моделирование составляющих адмитанса при изменениях емкости приелектродного слоя, сопротивления и емкости объекта неэлектрической природы в частотном диапазоне тестового сигнала. Обработано полученные результаты изменения активной и реактивной составляющих проводимости и даны рекомендации относительно оптимального частотного диапазона проведения измерений и особенностей конструктивных элементов электрической модели контроля качества объектов неэлектрической природы. Operational control of quality vegetables can be made using the method immitance control their electrical parameters.Vegetables – are objects of non-electric nature, and their juices – this electrolyte solutions, where there are free charged particles – ions, and it immitance method is based on measuring the electrical conductivity control objects. Therefore, research is relevant electrical parameters vegetable juices as well as development of electric and mathematical models immitance contact transducer. The object of the research is the process of measuring electrical parameters of objects of non-electrical nature. The study examined the features are measuring electrical parameters of the objects of nature electic primary contact transducers. The aim of the research is to identify the influence of parameters of contact transducers for measuring electrical parameters results electic nature objects in a frequency range test signal. Main tasks: – Make electric model quality control facilities electic nature; taking into account known today prototypes; – Make a mathematical model of quality control facilities electic nature; – Assess the impact of the model parameters (resistance and capacitance facility and capacity electrode layer) on the results of measurements of electrical parameters electic nature objects in a frequency range test signal. To study the electrical parameters of vegetable juice prepared generalized electrical equivalent circuit system “sensormeasuring tool”. Based on the equivalent circuit constructed system “sensor-measuring means” formed mathematical model of the transformer primary object of control. Informative electrical parameters are immitance components (active and reactive component) primary converter with vegetable juice (non-electric research object nature). Make up electrical and mathematical model of quality control objects non-electrical nature, taking into account known today prototypes and the results of experimental studies of changes active and reactive components of the conductivity (admittance) in the frequency range test signal. Using the experimental results of change of active and reactive components of the conductivity (admittance) using Solve Block in the software package MathCad Prime 3.1, values obtained resistance and capacitance object electic nature and capacity electrode layer in a frequency range test signal. Done mathematical modelling of admittance components with changes capacitance of electrode layer, resistance and capacitance of object non-electrical nature in a frequency range test signal. Processed obtained results of change of active and reactive components of the conductivity and provides guidance on the optimal frequency range of measurement and features of structural elements of the electrical model quality control objects non-electrical nature. The results of mathematical modeling components admittance was concluded that with increasing frequency electrode layer capacitance Cn frequency from which the active component is independent frequency decreases.And for independence measurement result object nature electic resistance Rx = 46 ohms and a capacity Cx = 1500 pkF (eg Carrot juice) at lower frequencies necessary to increase the capacity electrode layer, using a sensor with a greater area of the electrodes.Changing the capacity control object Cx does not affect the value immitance (this follows from the analysis of the expression of the active component of impedance as Cn >> Cx). Frequency from which reactive component is practically constant, slightly increases with increasing facility capacity control Cx. With the growing resistance of the control object Rx = 20, 40, 60, 80, 100 ohms (this range of resistance values corresponding to different vegetable juices) curves active component of impedance shifted downward by the value of active component of impedance and left in frequency, that frequency, from which the active component is independent frequency decreases. Therefore, for the independence of the measurement result object electic nature with less resistance required measurements at higher frequencies. However, with increasing resistance Rx frequency control facility from which the reactive component is practically constant, unchanged.
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    Систематизація показників якості у кваліметрії продукції овочівництва
    (Видавництво Львівської політехніки, 2015) Мідик, Ігор; Столярчук, Петро
    Сформовано та систематизовано показники якості продукції овочівництва для розроблення єдиних принципів оцінювання та визначення комплексного показника якості з урахуванням різнопрофільних потреб споживачів. Сформированы и систематизированы показатели качества продукции овощеводства для разработки единых принципов оценки и определения комплексного показателя качества с учетом разнопрофильных потребностей потребителей. Vegetables has a number of specific properties that aremanifested in consumption, storage and processing of vegetables. The study is the formation and systematization of quality vegetable products to develop common principles for the evaluation and determination of complex quality indicator taking into account the needs of different profiles of consumers. The main tasks of quality control of vegetable products, according to the author, are: – Support structure and classification of quality products of vegetables; – Development of methods for determining quantitative assessments of quality products of vegetables; – Development of algorithmfor determining the complex indicator of quality products of vegetable divers to consumer needs. The level of Ukrainian harmonization of regulations with European and international is currently insufficient, there are still valid outdated standards that have significant differences from European and international on the classification of products in quality, safety indicators and methods of control quality and product safety. Regulatory documents describe the values of quality perfomance in the types of vegetables, but they are not normalized the values of all quality indicators vegetables. In a number of standards is describing methods for determining the content of harmful elements in vegetables. It was established that the existing system of evaluating the quality of vegetable production is imperfect. First, it does not regulate the determination of complex perfomance of quality, but only the individual values, and secondly, not all indicators are covered by quality vegetables, thirdly, not all quality indicators regulated requirements for their regulation, and units of measurement, in- fourth, do not take into account the needs of different consumers. Therefore, the proposed set of indicators of quality vegetables that fully characterize the properties of vegetables, their sistematization, putting priority of requirements, which allows to take into account the needs of different customers, laying the theoretical foundations to answer applied problems of quality control of vegetables. Established range of indicators quality products of vegetables and identified the following groups quality indicators: indicators of impairment; organoleptic indicators; indicators of technological purpose; safety performance; indicators transportability. The group of utility performance indicators are part of vegetables that should be divided into the following groups: indicators of nutrient content, indexes the content of vitamins, minerals content indicators, indicators of antioxidant activity. Organoleptic performance divided into subgroups: appearance, physical size indicators, indicators of taste, odor performance. Indicators include keeping quality technological purposes, characterizing safety of vegetables and duration determined in days, and compliance usage method, which determine propose in points. Indicators advisable to include security indicators characterizing the degree of contamination of vegetable toxins, mycotoxins and nitrates, lack of exposure to extend storage, lack of processing of stimulation freshness, indicator absence of genetically modified varieties. Indicators of transportability characterizing opportunity transportation vegetables: duration of transportation and the availability of appropriate packaging during transport. Developed quality evaluation table carrots presented each indicator thresholds, specified priority requirements, which can set consumers according to their needs, and the indicator in evaluating the quality of carrot. It is offered and characterized a set of indicators as quality vegetables, set them measure units, grouped set parameters for providing a comprehensive evaluation of the properties of vegetables, considering the needs of different profiles of consumers. Determined that it is appropriate to conduct a comprehensive evaluation of quality vegetables, and for such a comprehensive evaluation of quality vegetables is necessary to amend the regulations, regulating individual thresholds for quality vegetables.
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    Проблемні аспекти оцінки якості сільськогосподарської продукції
    (Видавництво Львівської політехніки, 2014) Лиса, Ольга; Мідик, Ігор
    Запропоновано, використовуючи багатокритеріальну модель оцінювання якості продукції, сформувати оптимальну структуру добрив для вирощування сільськогосподарської продукції потрібної якості. Здійснено апробацію багатокритеріальної моделі оцінювання якості сільськогосподарської продукції з оптимізацією кількості мінеральних добрив при вирощуванні на підставі дослідів з аналізу впливу мінеральних добрив на пивоварну якість зерна ярого ячменю. Предложено, используя многокритериальную модель оценки качества продукции, сформировать оптимальную структуру удобрений для выращивания сельскохозяйственной продукции нужного качества. Осуществлена апробация многокритериальной модели оценки качества сельскохозяйственной продукции с оптимизацией количества минеральных удобрений при выращивании на основании опытов по анализу влияния минеральных удобрений на пивоварное качество зерна ярового ячменя. The paper presents, using a multi-objective evaluation model of product quality, create the optimal structure of fertilizer for growing agricultural products as desired. The approbation of multi-objective evaluation model of agricultural products quality with optimization of mineral fertilizers at cultivation on the basis of experiments on the analysis of fertilizers on quality of grain of spring brewing barley.