scholarly journals Manifestations and causes of meromixis in lakes resulting from mineral extraction in Czechia

Geografie ◽  
2010 ◽  
Vol 115 (1) ◽  
pp. 96-112 ◽  
Author(s):  
Tomáš Hrdinka ◽  
Miroslav Šobr
Keyword(s):  
Water Surface ◽  
Raw Materials ◽  
Raw Material ◽  
Chemical Characteristics ◽  
Specific Character ◽  
Mineral Extraction ◽  
Physical Chemical ◽  
Morphometric Feature ◽  
Physical And Chemical ◽  
Qualitative Characteristics

Anthropogenic lakes (lakes that have developed in mined-out pits as a consequence of mineral raw material mining) exhibit many interesting phenomena. Specific water features are the most remarkable, including physical, chemical and the biological characteristics. Other very specific morphometric feature of anthropogenic lake basins include the unusual location of the lake’s water surface: often several dozen meters below the adjacent terrain and the specific character of the mined-out raw materials. All of these factors affect the qualitative characteristics of lake’s water, even decades after flooding. The interaction of the factors mentioned above has resulted in the creation of a permanent meromixis in some anthropogenic lakes. The author’s primary objectives are to present some physical and chemical symptoms of meromixis at selected localities, to discuss the mutual interaction between the physical and chemical characteristics of lake water and to explore some probable causes of the origin of meromixis at the selected localities.

scholarly journals KARAKTERISTIK FISIK, KIMIA DAN ORGANOLEPTIK MIE KERING PADA BERBAGAI RASIO TEPUNG BONGGOL PISANG KEPOK

AGROINTEK ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 82
Author(s):  
Asnani Asnani ◽  
Abdul Rahim ◽  
Ifall Ifall
Keyword(s):  
Water Absorption ◽  
Water Content ◽  
Wheat Flour ◽  
Sensory Analysis ◽  
Starch Content ◽  
Weight Basis ◽  
Chemical Characteristics ◽  
Group Design ◽  
Physical Chemical ◽  
Physical And Chemical

<em>This work deals with the effect of banana (sweet plaintain or ‘kepok’ variety) hump flour substituted to wheat flour in the making of noodle, on physical, chemical, and sensory characteristics of noodle.  A completely randomized was employed, with three replicates. Sensory analysis was conducted according to randomized group design. Four proportions of banana hump to wheat flour (10:90, 20:80, 30:70, and 40:60, weight basis) was studied. Results showed that the best physical and chemical characteristics was shown by noodle made from 10:90 proportion of banana hump to wheat flour, with 4.59% water absorption, 0.57% cooking loss, 10.37% water content, 34.21% starch content. However, result of sensory analysis suggested that the most liked noodle was that made from flour proportion of 20:80 with ‘like’ for colour, ‘like very much’ for aroma, ‘like’ for texture, ‘like’ for taste, and ‘like’ for overall preference</em>

scholarly journals Evaluation of microbiological, physical and chemical characteristics and hydraulic characteristics of the water in the ponds for growing marketable fish of the National Natural Park «Podolski Tovtry»

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
T. Prilipko ◽  
R. Yakubash
Keyword(s):  
Bottom Water ◽  
Chemical Characteristics ◽  
Hydraulic Characteristics ◽  
Hydrochemical Characteristics ◽  
Hydrochemical Regime ◽  
Natural Park ◽  
Physical Chemical ◽  
Water Ph ◽  
Physical And Chemical ◽  
Observation Period

The results of the study of the basic physical, chemical, microbiological and hydrochemical characteristics of water ponds for growing freshwater fish. Data analysis hydrochemical regime studied ponds throughout the observation period showed that it was relatively stable fluctuated within small and do not exceed the maximum allowable substances in water. PH of water management ponds research ranged 6.1 – 7.5. Nitrites and nitrates were also in small concentrations that do not exceed regulatory and amounted to 0.1 mg N/l and 1.1 mg N/l. Established in the summer studied water samples contained more E.coli, than in the spring and autumn months and had a circle–titer less than 0.1 in 18.3% of cases. Indicator KMAFAnM water was almost 13 times higher in summer compared to spring and autumn. KilkistE.coli fall in surface water was on average within 1 – 3 CFU / cm3, and in the summer 6– 9. In the bottom water kilkistE.coli autumn was on average within 0 – 1 CFU / cm3, and in the summer 5 – 9 cfu / cm3. Indicator Value KMAFAnM in the mud was higher than the value in the bottom water fall nearly 210 times in the summer – in 417 times.

scholarly journals Nori Level of Preference with Mixed Sargassum sp. and Eucheuma spinosum Seaweed as Raw Material

2019 ◽  
pp. 1-9 ◽  
Author(s):  
Abdurrahman Faris ◽  
Evi Liviawaty ◽  
Yuli Andriani ◽  
Eddy Affrianto
Keyword(s):  
Water Content ◽  
Experimental Method ◽  
Raw Material ◽  
Chemical Characteristics ◽  
Crude Fibre ◽  
Biological Resources ◽  
Research Level ◽  
Physical Testing ◽  
Physical And Chemical ◽  
Crude Fibre Content

This research aimed to obtain the best nori from a mixture of Sargassum sp and Eucheuma spinosum seaweed and the most preferred by panellists. The research's method used in this study is an experimental method with 3 treatments comparing the seaweed between Sargassum sp. and Eucheuma spinosum that is 1:1, 2:1, 3:1 then tests that used are hedonic test with 20 semi-trained panellists who have experience in organoleptic assessment as replications, physical and chemical tests were also tested for the best treatment according to hedonic test. This research was conducted at the Fisheries Product Processing Technology Laboratory of the Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran, while the chemical and physical testing of the final results of the research was conducted at the Laboratory of Biological Resources and Biotechnology at LPPM Institut Pertanian Bogor. This research was conducted on February 28, 2019, until March 8, 2019. Based on the results of the research level of preference of nori, it was found that all treatments carried out were still acceptable to the panellists, but the treatment with a ratio of 1: 1 was more preferred by panellists. Chemical characteristics of the Sargassum sp. and Eucheuma spinosum, namely water content contained in the amount of 15.67%, crude fibre content of 11.7% and physical characteristics of the hardness of 300.78 gf, also thickness with nori 0.347 mm.

scholarly journals Chironomid (Diptera) species recorded from UK lakes as pupal exuviae

2013 ◽  
Vol 45 (2) ◽  
pp. 13 ◽  
Author(s):  
L.P. Ruse
Keyword(s):  
Water Surface ◽  
New Records ◽  
Adult Emergence ◽  
Chemical Characteristics ◽  
Aquatic Species ◽  
Pupal Exuviae ◽  
Water Currents ◽  
Chironomid Species ◽  
Juvenile Stages ◽  
Physical And Chemical

An inventory of chironomid species (Diptera, Chironomidae) data collected from 221 lake basins or reservoirs is detailed together with major physical and chemical characteristics of these waterbodies. Aquatic species of Chironomidae must rise to the water surface for adult emergence. Floating exuviae are transported by wind and water currents to lakeshores. Species data were obtained by collecting lake marginal floating pupal exuviae representing juvenile stages dwelling from across the lake. Among the 450 species found, several were new records for the British Isles.

scholarly journals Use of basaltic waste as red ceramic raw material

Cerâmica ◽  
2016 ◽  
Vol 62 (362) ◽  
pp. 157-162 ◽  
Author(s):  
T. M. Mendes ◽  
G. Morales ◽  
P. J. Reis
Keyword(s):  
Size Distribution ◽  
Mechanical Performance ◽  
Raw Materials ◽  
Raw Material ◽  
Metropolitan Region ◽  
X Ray Diffraction ◽  
X Ray ◽  
Microstructure Evaluation ◽  
Firing Shrinkage ◽  
Physical And Chemical

Abstract Nowadays, environmental codes restrict the emission of particulate matters, which result in these residues being collected by plant filters. This basaltic waste came from construction aggregate plants located in the Metropolitan Region of Londrina (State of Paraná, Brazil). Initially, the basaltic waste was submitted to sieving (< 75 μm) and the powder obtained was characterized in terms of density and particle size distribution. The plasticity of ceramic mass containing 0%, 10%, 20%, 30%, 40% and 50% of basaltic waste was measured by Atterberg method. The chemical composition of ceramic formulations containing 0% and 20% of basaltic waste was determined by X-ray fluorescence. The prismatic samples were molded by extrusion and fired at 850 °C. The specimens were also tested to determine density, water absorption, drying and firing shrinkages, flexural strength, and Young's modulus. Microstructure evaluation was conducted by scanning electron microscopy, X-ray diffraction, and mercury intrusion porosimetry. Basaltic powder has similar physical and chemical characteristics when compared to other raw materials, and contributes to ceramic processing by reducing drying and firing shrinkage. Mechanical performance of mixtures containing basaltic powder is equivalent to mixtures without waste. Microstructural aspects such as pore size distribution were modified by basaltic powder; albite phase related to basaltic powder was identified by X-ray diffraction.

scholarly journals Organoleptic, physical, and chemical tests of artificial feed for milk fish substituted by earthworm meal (Lumbricus sp.)

2013 ◽  
Vol 11 (2) ◽  
pp. 124 ◽  
Author(s):  
Siti Aslamyah ◽  
Muh. Yusri Karim
Keyword(s):  
Fish Meal ◽  
Raw Materials ◽  
Raw Material ◽  
Water Stability ◽  
Physical Test ◽  
Feed Quality ◽  
Physical And Chemical ◽  
Different Levels ◽  
Sinking Velocity

<p>Earthworms meal (Lumbricus sp.) is very prospective as milkfish feed raw materials to substitute fish meal. Type of raw material and the exact composition will generate artificial feed quality with high levels of water stability, desirable, and safe for the fish. The purpose of this study to evaluate the quality of milkfish feed at different levels of fish meal substitution with earthworms (Lumbricus sp.) based on organoleptic, physical, and chemical tests. The treatments tested levels of substitution of fish meal with earthworms meal in artificial feed milkfish, namely: feed A (0%); feed B (34,62%); feed C (65,38%) and feed D (100%). The organoleptic and physical test showed that all the feed has a smooth texture, pungent aroma, and brown in color, with good water stability (rupture velocity ranged from 91,25±1,47 up to 92,87±1,67 minutes and dispersion of solids 11,14±1,55 up to 11,87±1,3%), hardness 84±0,18 up to 84,71±1,24%, sinking velocity 5,07±0,68 up to 5,64±0,17 cm/sec, the level of homogeneity of 81,34±0,17 up to 85,68±1,85%, the allure of 0,62±0,58 up to 0,65±0,12 cm/sec and delicious power of 0,059±0,024 up to 0,067±0,032 g/fish weight/day. The quality of feed is chemically with moisture content ranging from 8,4–9,1%, 16,7–19,46% ash, 31,07–32,37%, protein, 6,67–7,58% fat, crude fiber 7,45–7,87%, NFE (nitrogen free extracts) 35,35–35,48%. Results show that different levels of substitution of fish meal with earthworms meal (Lumbricus sp.) produces the same feed quality and contains nutrients in a range requirement milkfish. Accordingly, earthworms meal (Lumbricus sp.) can be substituted for fish meal in fish milk feed artificial up to 100%.</p><p>Keywords: substitution, fish meal, earthworms meal (Lumbricus sp.), artificial feed, milkfish</p>

scholarly journals Study of microflora change and preservation of vitamins b2 and e of grain in the process of steaming and flaking

2021 ◽  
pp. 76-79
Author(s):  
I. S. Bogomolov ◽  
N. L. Kleymenova ◽  
M. V. Kopylov
Keyword(s):  
Raw Materials ◽  
Drying Process ◽  
Testing Laboratory ◽  
Industry Studies ◽  
Plant Raw Materials ◽  
Feed Industry ◽  
Russian Research Institute ◽  
Physical And Chemical ◽  
Qualitative Characteristics ◽  
Russian Research

The study of the process of moisture-thermal treatment of grain crops: wheat, oats, barley, corn, peas, bran and others was carried out in the work. The drying process examination was done on a drying plant located in the testing laboratory of JSC "Research and Production Center" All-Russian Research Institute of the Feed Industry ". Studies of the grain qualitative characteristics were carried out in the accredited testing laboratory of JSC "RPC" ARSRIFI", which allows carrying physical- and chemical analysis, mycotoxicology and microbiology of plant raw materials.

scholarly journals Miscanthus plants processing in fuel, energy, chemical and microbiological industries

2019 ◽  
pp. 403-411
Author(s):  
Olga Babich ◽  
Olga Krieger ◽  
Evgeny Chupakhin ◽  
Oksana Kozlova
Keyword(s):  
Alternative Energy ◽  
Plant Biomass ◽  
Raw Materials ◽  
Hydrocarbon Fuel ◽  
Raw Material ◽  
Biomass Combustion ◽  
Alternative Energy Sources ◽  
Miscanthus Giganteus ◽  
Renewable Raw Material ◽  
Physical And Chemical

The increasing shortage of fossil hydrocarbon fuel dictates the need to search for and develop alternative energy sources, including plant biomass. This paper is devoted to the study of the Miscanthus plants biomass potential and the analysis of technologies of its processing into products targeted at bioenergy, chemistry, and microbiology. Miscanthus is a promising renewable raw material to replace wood raw materials for the production of chemical, fuel, energy, and microbiological industries. Miscanthus is characterised by highly productive (up to 40 tons per one hectare of dry matter) C4-photosynthesis. Dry Miscanthus contains 47.1–49.7% carbon, 5.38–5.92% hydrogen, and 41.4–44.6% oxygen. The mineral composition includes K, Cl, N and S, which influence the processes occurring during biomass combustion. The total amount of extractives per dry substance lies in the range of 0.3–2.2 % for different extraction reagents. Miscanthus has optimal properties as an energy source. Miscanthus × giganteus pellets showed the energy value of about 29 kJ/g. For the bioconversion of plants into bioethanol, it is advisable to carry out simultaneous saccharification and fermentation, thus reducing the duration of process steps and energy costs. Miscanthus cellulose is of high quality and can be used for the synthesis of new products. Further research will focus on the selection of rational parameters for processing miscanthus biomass into products with improved physical and chemical characteristics: bioethanol, pellets, industrial cellulose, bacterial cellulose, carbohydrate substrate.

scholarly journals Gluten-free Buckwheat Kvass with Aromatic Raw Materials

2020 ◽  
Vol 50 (1) ◽  
pp. 70-78 ◽  
Author(s):  
Tatiana Tanashkina ◽  
Anastasia Peregoedova ◽  
Anna Semenyuta ◽  
Margarita Boyarova
Keyword(s):  
Antioxidant Activity ◽  
Shelf Life ◽  
Raw Materials ◽  
Radical Scavenging ◽  
Control Sample ◽  
Chemical Properties ◽  
Raw Material ◽  
Gluten Free ◽  
Plant Materials ◽  
Physical And Chemical

Introduction. The production of gluten-free food products, including alcohol-free beverages, is an urgent task for Russian food industry. Buckwheat malt has a great raw material potential, because it consists rutin, which can give the final product some useful functional properties. Aromatic raw materials improve the sensory characteristics of beverages and increase their nutritional value. Study objects and methods. Kvass is a traditional Russian bread juice. To prepare gluten-free kvass, we used light and scalding buckwheat malt and water infusions of barberry, juniper, leaves of garden currant, and lemon balm grass. The wort was prepared by infusion and fermented with bottom beer yeast Saflager W-34/70. Then it was blended with infusions of plant materials. Sensory and physical and chemical properties of kvass were determined by standard methods. Antioxidant activity of the beverages was assessed by using DPPH radical scavenging method. Results and discussion. All samples met the state standard requirements for kvass by sensory, physical, and chemical characteristics. The drinks obtained from the scalding malt were well-fermented and achieved better tasting ratings compared to those from the light malt. The control sample, which contained no aromatic raw materials, received the lowest scores for taste and aroma. The kvass blended with infusions of barberry and garden currant had the best results. The infusions increased the shelf life of the kvass from 7 days (control) to 12 (barberry), 14 (juniper), and 16 (currant). All samples of kvass demonstrated antioxidant activity, the beverage with infusion of garden currant leaves showing the best results (≤ 80%). Antiradical activity was established for the samples blended with barberry and currant infusions. Conclusion. light and scalding buckwheat malt can be used to prepare gluten-free kvass. Blending buckwheat kvass with infusions of aromatic raw materials increased the shelf life of the beverages, improved their taste, aroma, and antioxidant activity (except the sample with infusions of juniper), and gave them antiradical properties.

Raman, Infrared, and Laser-Induced Breakdown Spectroscopy Identification of Particles in Raw Materials

2017 ◽  
Vol 72 (2) ◽  
pp. 305-315
Author(s):  
Kathryn Lee ◽  
Markus Lankers ◽  
Oliver Valet
Keyword(s):  
Raw Materials ◽  
Particle Identification ◽  
Raw Material ◽  
Laser Induced Breakdown Spectroscopy ◽  
Chemical Components ◽  
Process Conditions ◽  
Breakdown Spectroscopy ◽  
Laser Induced Breakdown ◽  
Complementary Techniques ◽  
Physical And Chemical

Raw materials need to be of a certain quality with respect to physical and chemical composition. They also need to have no contaminants, including particles, because these could indicate raw material impurities or contaminate the product. Particle identification allows determination of process conditions that caused them and whether the quality of the final product is acceptable. Particles may appear to the eye to be very different things than they actually are. They may be coated with the raw material and may consist of several components; therefore, chemical and elemental analyses are required for accuracy in proper identification and definitive information about their source. Thus, microscope versions of Raman spectroscopy, laser-induced breakdown spectroscopy (LIBS), and infrared (IR) spectroscopy are excellent tools for identifying particles in materials. Those tools are fast and accurate, and can provide chemical and elemental composition as well as images that can aid identification. The micro-analysis capabilities allow for easy analysis of different portions of samples so that multiple components can be identified and sample preparation can be reduced or eliminated. The differences in sensitivities of Raman and IR spectroscopies to different functional groups as well as the elemental analysis provided by LIBS and the image analysis provided by the microscopy makes these complementary techniques and provides the advantage of identifying various chemical components. Proper spectral searching techniques and interpretation of the results are important for interpretation and identification of trace contaminants.

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