674,200 Works

Quality assessment of laser cladded HSS coatings with deep penetration into base material to obtain a smooth gradient of properties in coating-substrate interface

S. Ločs & I. Boiko
The present research is dedicated to the study of influence of coaxial laser cladding (CLC) process parameters onto values of alloying compo nents content in the coatings, morphology as well as the influence of post - cladding heat treatment on the quality and mechanical properties of coatings. The research is based on a hypothesis that applying of first layer of coatings onto steel substrate wit h keyhole in penetration allows achieving smooth gradient of properties...

Red clover drying coefficient dependences on air velocity at constant drying temperature

A. Aboltins, J. Tomsu & P. Kic
The clover is widely used as feed of animals and preservation of fodder is an important problem. This paper informs about the experimental and theoretical investigations of red clover ( Trifolium pratense ) drying by force d convection. This research is focused on verification of influence of different air velocities on the drying process of red clover in thin layer in mild temperatures (22 °C ) and rather high relative humidity of air (70 %...

Optimizing the sample size to estimate growth in I-214 poplar plantations at definitive tree density for bioenergetic production

P.A. Marziliano, D. Russo, V. Altieri, G. Macrì & F. Lombardi
In Europe, over the last decades, the arboriculture for woody biomass production has significantly expanded, often using poplar plantations. In order to maximize prod uction, the flexibility of the cultivation algorithms becomes necessary. For this reason, it is necessary to apply monitoring tools for the evaluation and estimate of the wood productions, without significantly affect the production costs. In particular, f or the estimate of the productions, the choice of the sample size is of...

Lake blue clay - sapropel - flax shive briquettes for water absorption and desorption

R. Tretjakova, A. Martinovs, M. Avisane & G. Kolcs
Latvian lakes are rich in sapropel sediments and below the sapropel layer there is another valuable natural resource, namely blue clay. Flax shives are formed in large quantities as a waste in flax processing factories. The problem involves processing and rational use of these reso urces. The paper studies the obtaining of briquettes from flax shives using sapropel and lake clay as a binding material. Briquettes are intended for use in cases when problems with...

Meat chemical composition of pasture pure lambs and crossbreeds

J. Vecvagars, D. Bārzdiņa & D. Kairiša
Increased customer interest of safe, healthy and environmentally friendly food consumption promote development of sheep farming industry in Latvia. Aim of the paper – explain of different pasture - fattened sheep breed and their crosses lamb meat composition traits. A study of pasture fattened lamb meat chemical composition was carried out from year 2013 to 2017. Fattening lambs were kept in breeding rams control station ‘Klimpas’ (57°50’58.8’’N 25°19’39.6’’E) pasture array. Lambs were slaughtered in a...

Combustion property analyses with variable liquid marine fuels in combustion research unit

M. Hissa, S. Niemi & K. Sirviö
The quality of ignition and combustion of four marine and power plant fuels were studied in a Combustion Research Unit, CRU. The fuels were low - sulphur Light Fuel Oil (LFO, baseline), Marine Gas Oil (MGO), kerosene and renewable wood - based naphtha. To meet climate change requirements a nd sustainability goals, combustion systems needs to be able to operate with a variety of renewable and ‘net - zero - carbon’ fuels. Due to the...

Kinematic viscosity studies for medium-speed CI engine fuel blends

K. Sirviö, S. Niemi, R. Help, S. Heikkilä & E. Hiltunen
Engine - driven power plants, run by diesel fuel or gas, will be needed for peaking power to keep the electricity grids stable when the production of renewable electricity, e.g. utilizing wind or solar power, is increased. The choice of the alternative, renewable fuels for engine - driven power plants and marine applications is at the moment quite narrow. The amount of renewables of all liquid fuels is at present less than 2%. Biodiesels, FAMEs,...

Exhaust particle size distributions of a non-road diesel engine in an endurance test

T. Ovaska, S. Niemi, T. Katila & O. Nilsson
The main objective of this study was to find out how th e non - road diesel engine running period of 500 hours affects the exhaust particle size distribution. By means of an engine exhaust particle sizer (EEPS), particle number was measured before the endurance test and after 250 and 500 hours of engine operation . The size distributions were determined at full and 75% loads both at rated and at intermediate speeds. The soot,...

Alarm guard systems for the prevention of damage produced by ungulates in a chestnut grove of Middle Italy

L. Conti, S. Bartolozzi, S. Iacobelli, V. Racanelli & F. Sorbetti Guerri
Wildlife populations, in particular ungulates and carnivores, have had a significant increase in most Italian regions over the last decades and for this reason ecosystems and agricultural and forest productions are threatened by damage produced by wildlife. In order to evaluate effective met hodologies and technologies to mitigate the impact of this phenomenon, innovative protection systems, such as electronic acoustic alarm guard sensors, were tested. These devices are able to randomly produce a significant number...

Criteria of design for deconstruction applied to dairy cows housing: a case study in Italy

L. Leso, L. Conti, G. Rossi & M. Barbari
This work aims at presenting the design process of a new barn for dairy cows. Project embraces several concepts that are rather new to the dairy industry and will deeply affect its environmental, economic and social sustainability. The barn will be built o n a green field site located in Cervasca (CN) in the region of Piedmont. Building has been designed applying the emerging principle of "design for deconstruction" extensively. A series of constructive solutions...

Molecular genetics analysis of milk protein gene polymorphism of dairy cows and breeding bulls in Latvia

D. Smiltina & Z. Grislis
Milk protein is the most valuable component of milk from a dietary point of view. More than 95% of ruminants’ milk proteins are coded by six structural genes: two whey proteins (α – lactalbumin and β – lactoglobulin) and four caseins (α S1 – and α S2 – caseins, β – casein, κ – casein). The object of the research was the genetic polymorphisms of milk protein genes in populations of cows and breeding bulls...

Properties of local produced animal-fat based biodiesel and its blend with fossil fuel

K. Sirviö, S. Heikkilä, R. Help, S. Niemi & E. Hiltunen
In the near future, more emphasis must be put on reducing greenhouse gas (GHG) emissions in road transportation, house heating, agricultural activities, marine transport etc. This study concentrated on the use of alternative fuels in engine - driven applicat ions of non - road machineries and decentralized energy production . Today, the engines are mainly designed for crude oil derived fuels and liquid renewable fuels are blended with crude oil based fuels to fulfill the...

The role of field beans in nutrition of Boer goat

E. Aplocina
A study on the effective using of field beans to Boer mother goats feeding was carried out on a farm whose main activity is the production of goat meat. Since the Boer goat breed is still very rare in Latvia, there is a lack of experience in the feeding of meat goat. Goat productivity was analyzed according to the birth weight of goat kids a nd kids live weight at 50 days, as well as...

Influence of inoculation and phosphorus regimes on symbiotic nitrogen fixation and phosphorus use efficiency of Algerian cowpea (Vigna unguiculata L. (Walp.)) landraces

S. Benlahrech, G. Kac, M. Teffahi & S.M. Ounane
To study the genotypic variation of cowpeas on plant growth and phosphorus (P) uptake which is a function of different P regimes in the soil rhizosphere , 6 landraces of cowpea commonly found in northern Algeria ( NE4, NE10, NE11, NKT5, NKT7, NKB7 ) and 4 landraces from Sahara in southern Algeria (NAG4, NAG5, NAT2 and ND3) were studied during 2013 – 2014 in greenhouse. They were inoculated with Mesorhizobium sp. (S1), Bradyrhizobium sp. (S2)...

Humus content in a podzolized chernozem after a long-term application of fertilizers in a field crop rotation

H. Hospodarenko, I. Prokopchuk, S. Prokopchuk & А. Trus
The article presents the results of the research into influence of a long - term (50 years) application of different fertilizer rates and fertilizer systems in the field crop rotation on the humus composition and optical parameters of humic acids of a heavy - loamy podzolized chernozem of the Right Bank Forest - Steppe of Ukra ine. It was found that application of fertilizers significantly affects the dominance of humic acids over fulvic acids in...

Effects of Monopotassium-phosphate, Nano-calcium fertilizer, Acetyl salicylic acid and Glycinebetaine application on growth and production of tomato (Solanum lycopersicum) crop under salt stress

T.K. Sajyan, N. Shaban, J. Rizkallah & Y.N. Sassine
Salinity problem is increasingly affecting tomato production in Lebanon leading to economic losses. The study investigated the potential effects of nano - Calcium (LITHOVIT®), monopotassium - phosphate (MKP: 0 - 52 - 34) fertilizers, Acetyl salicylic aci d (Aspirin) and the osmoregulator glycinebetaine (GB) on salt tolerance of potted determinate tomato (variety Sila) plants in open - field. Salt stress was induced by irrigation solutions of EC = 2, 4, 6, 8 and 10 mS...

Chemical composition of agromass ash and its influence on ash melting characteristics

D. Čepauskienė, N. Pedišius & D. Milčius
The increasing demand for biofuels leads to a growing need for agromass, such as herbaceous plants and agricultural waste. However, agromass contains high quanitites of alkali metals, mainly potassium and sodium, which limits agromass usage in thermoconversion processes. Alkali metals react with other ash forming elements which leads to ash related problems such as agglomeration, fouling and slagging during agromass burning. In this study, chemical composition and melting behaviour of ashes form ed at 550...

Evaluation of reed biomass use for manufacturing products, taking into account environmental protection requirements

I. Muizniece, V. Kazulis, L. Zihare, L. Lupkina, K. Ivanovs & D. Blumberga
In many countries reed is considered as invasive or unnecessary plant, because it is spreading rapidly, causing decrease in biodiversity and creating unacceptable living conditio ns for many bird species in their natural habitats. Due to environmental considerations it is necessary to cut reed, to decrease their over exceeding growth. Reed burning or leaving for decomposition on fields, that has been practiced until now, creates ad ditional carbon dioxide air pollution. Therefore, the question on...

Determination of moisture ratio in parts of the hop cone during the drying process in belt dryer

P. Heřmánek, A. Rybka & I. Honzík
The paper deals with monitoring the moisture content of hop cones and their parts (strigs and bracts) in PCHB 750 hop belt dryer. When drying hop cones, the critical point is the sufficient drying of the strig. These are therefore dried to a moisture content o f 6 to 8%. This exact moisture provides a sufficient guarantee ensuring that the strig is dried up. On the other hand, bracts are dried up to such a...

A study of commercial β-galactosidase stability under simulated in vitro gastric conditions

K. Žolnere, I. Ciproviča, A. Ķirse & I. Cinkmanis
β-Galactosidase activity in milk may be affected by several factors, such as temperature, pH, milk composition, and metal ions. It is important to note that digestive proteases and gastrointestinal pH can affect enzyme activity during transit through the gastrointestinal tract. For the investigation of commercial β - galactosidase stability in human and animal gastric tracts, human gastrointestinal tract (GIT) models were employed, enabling prediction of enzyme activity under in vivo conditions. The aim of this...

Energy potential of densified biomass from maize straw in form of pellets and briquettes

M. Križan, K. Krištof, M. Angelovič, J. Jobbágy & O. Urbanovičová
The aim of the study was the evaluation and comparison of energy potential of briquettes and pellets produced from the maize straw and woody biomass based on various diameters of pellets. By experimental measurements a calorific value and ash content was obser ved. Calorific value was measured by laboratory calorimeter IKA C 6000 (IKA® Works, Inc., USA) and laboratory combustion chamber Lindberg/Blue M (Thermo Fisher Scientific, Inc., USA). Individual calorific values and ash content was...

Low temperature BMP tests using fish waste from invasive Round goby of the Baltic Sea

A. Gruduls, K. Balina, K. Ivanovs & F. Romagnoli
Round goby (Neogobius melanostomus ) is an invasive fish species in the Baltic Sea. While meat can be used for human consumption, fish processing residues are considered as a waste. Within circular economy and bio - economy perspectives fish waste could be used as a valuable feedstock for biogas prod uction. However, the research is mostly focused on evaluating biogas yield at mesophilic conditions (i.e. 37 °C ). In this study the impact of low...

The influence of dietary inclusion of peas, faba bean and lupin as a replacement for soybean meal on pig performance and carcass traits

L. Degola & D. Jonkus
The effect of peas, faba bean and lupin seed inclusion in growing and finishing pig diets was evaluated. The control diet included soybean meal at 15%, but in the trial groups diets peas were 15 or 28%, faba bean 20 or 25%, lupin seed 12 or 15%, completely replacing soybean meal. Diets formulated to be isoenergetic for ME and with the same crude protein content. The faba bean and, especially, lupin seed meal inclusion in...

Effect of thermal environment on body temperature of early - stage laying hens

R.R. Andrade, I.F.F. Tinôco, C.F. Souza, K.P. Oliveira, M. Barbari, V.M.F. Cruz, F.J.F. Baptista, M.O. Vilela, L. Conti & G. Rossi
The thermal comfort condition of early - stage laying hens can be verified by means of physiological variations. The mean surface temperature and cloacal temperature are important parameters to d emonstrate the effect of the thermal environment on the birds. The objective of the present study was to correlate homeostasis and stress with physiological responses (mean surface temperature and cloacal temperature) of lightweight laying hens of the Lohm ann LSL Lite line aged from one...

Productive performance of broilers at the final stage of breeding submitted to different levels of metabolizable energy in different thermal environments

K.P. Oliveira, C.F.S. Ferreira, I.F.F. Tinoco, R. R. Andrade, M. Barbari, V.M.F. Cruz, F.J.F. Baptista, M.F.A. Vieira, L. Conti & G. Rossi
The Brazilian poultry industry is an activity in constant development due to the high indices of productive efficiency. The accelerated evolution of poultry production has allowed to obtain early and very efficient broilers able to convert different foods into animal protein. However, due to this intensive breeding system, a series of metabolic and management problems appeared, with emphasis on thermal stress. The objective of this work was to evaluate the physiological responses of broiler chickens...

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