Wyniki wyszukiwania - Biblioteka Nauki

1

Thermogravimetric analysis of commercial thermally modified wood

100%

Grześkowiak W. Ł. , Bartkowiak M.

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tom vol. 58, nr 194

23--36

EN

In the article the results are shown of a thermogravimetric analysis of four thermally modified wood species. Thermally modified wood before and after the extraction process was used for the tests. The extraction process had no significant effect on changes in the thermal characteristics either in the raw wood or in the modified wood, irrespective of the tested wood species.

2

Performance of green high-strength concrete incorporating palm oil fuel ash in harsh environments

100%

Zeyad A. M. , Johari M. A. M. , Aliakbar A. , Magbool H. M. , Majid T. A. , Aldahdooh M. A. A.

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2023

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tom Vol. 41, No. 4

24--40

EN

The corrosion of steel reinforcement by chloride is commonly recognized as a key factor that contributes to the degradation of durability in reinforced concreae structures. Using supplementary cementitious materials, such as industrial and agricultural waste materials, usually enhances the impermeability of the concrete and its corrosion resistance, acid resistance, and sulfate resistance. This study’s primary purpose is to examine the effects of replacing ordinary Portland cement (OPC) with ultrafine palm oil fuel ash (U-POFA) on the corrosion resistant performance of high-strength green concrete (HSGC). There were four HSGC mixes tested; the first mix contained 100% OPC, while the other mixes replaced OPC mass with 20%, 40%, and 60% of U-POFA. The performance of all HSGC mixes containing U-POFA on workability, compressive strength, porosity, water absorption, impressed voltage test, and mass loss was investigated at 7, 28, 60, and 90 days. Adding U-POFA to mixes enhances their workability, compressive strength (CS), water absorption, and porosity in comparison with mixes that contain 100% OPC. The findings clearly portrayed that the utilization of U-POFA as a partial alternative for OPC significantly enhances the corrosion-resistant performance of the HSGC. In general, it is strongly advised that a high proportion of U-POFA be incorporated, totaling 60% of the OPC content. This recommendation is the result of its significance as an environmentally friendly and cost-effective green pozzolanic material. Hence, it could contribute to the superior durability performance of concrete structures, particularly in aggressive environmental exposures.

3

The ice mass loss in the front zone of the Werenskiold Glacier from 1957 to 1978 determined using terrestrial photogrammetry

86%

Janina J. , Lipert C. , Mechliński Z. , Janina J. , Lipert C. , Mechliński Z.

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4

Examination of remaining zinc coating on old corrugated steel culverts under railway

86%

Hansing L. , Cederqvist S.

Archiwum Instytutu Inżynierii Lądowej

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2017

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tom Nr 23

125--131

EN

In this paper the authors present measurements of the zinc coating thickness performed on old corrugated steel culverts under railway in Sweden. The measurements were performed in the summer of 2015. The object of the study is to have an indication on how hot dip galvanized corrugated steel culverts withstand real conditions. This information forms an important basis for the decision on possible life time expectancies for those structures.

5

Above and Below-Ground Decomposition of Leaf Litter in Leucaena leucocaephala Plantation of Federal University of Agriculture, Abeokuta (FUNAAB), Nigeria

86%

Oladoye A. O. , Oyebamiji N. A. , Ayoku Y. B.

World News of Natural Sciences

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2019

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tom 23

211-220

EN

A decomposition study was carried out on the leaf litters of Leucaena leucocaephala to determine the rate of decomposition of its leaves with respect to its placement on above or below the ground levels in L. leucocaephala plantations of the Federal University of Agriculture, Abeokuta, Nigeria. In the study, leaf litter were randomly handpicked from the forest floor, of this, 40 g each were weighed into thirty (30) litter bags of 2 mm mesh size in which 15 were randomly placed on the forest floor (above-ground) and the remaining 15 were buried in the soil between 5-10 cm depth (below-ground). Data were analysed using descriptive statistical techniques such as percentage, while inferential statistics (simple linear regression) was used to determine relationships between various nutrient elements and days of decomposition (DOD). We noted that the percentage of mass loss of leaf litter increased with time in days after deposit and was higher (29.93%, 32.43 % and 33.25%, 41.65%) at 80 to 100 days of placement above- and below-ground, respectively. Moreover, the exchangeable basic cations and chemical compositions of litters were not consistent with respect to DOD. Regression analysis of nitrogen (N) and organic carbon (OC) showed that these elements significantly contributed to the high (86 %) overall decomposition of litter (p < 0.05, p < 0.01) below-ground level. It is, therefore, concluded that decomposition of leaf litters occur faster below ground than above ground within the forest plantation.

6

Petrophysical control on the mode of shearing in the sedimentary rocks and granitoid core of the Tatra Mountains during Late Cretaceous nappethrusting and folding, Carpathians, Poland

72%

Jurewicz E.

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tom Vol. 56, no. 2

159-170

EN

In the Tatra Mts., the variability of structures within the granitoid rocks and their sedimentary complexes depends on the physical properties of the rocks, particularly on their porosity and sensibility to dissolution. In the relatively homogeneous and low porosity granitoid rocks, the shear surfaces are planar and smooth without damage zones around the shear planes. They did not develop open spaces during shearing, which prevented fluid migration and hydrotectonic phenomena. In the sedimentary rocks, mechanical, mostly bedding anisotropy controlled the geometry and morphology of the shear zones. High porosity and recurring changing in pore fluid pressure determined the cyclic character of the thrustrelated shearing processes. Fluids appearing within the thrust-fault fissure played the key role in tectonic transport and selective mass-loss processes (hydrotectonic phenomena). The mass-loss process was an effect of mechanical disintegration, pressure solution and cavitation erosion.The multistage character of the thrusting processes resulted in a gradual increase in mass loss value and in geometrical complication of the shear zones. Within the Czerwone Wierchy Nappe, the minimum value of the mass-loss estimated from a restored cross-section is in the range of 15-50%.

7

The experimental research on adhesion and mass loss for reinforcing steel covered with polymeric sulphuric composites

72%

Książek M.

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tom R. 10, nr 4

374-379

EN

This paper presents the results of the experimental research and analyses indicating the usefulness of polymer sulphur composites to the protection against corrosion of reinforcement. In paper presents materials also the domain of the personal investigations and the methodology are definite. After the analyze of the initial results the optimum compositions have been chosen to the experimental research. In paper the review of the literature have been done, among other things about select using polymer sulphur composites in buildings, about the methods of the surface protection against corrosion of reinforcement and about the methods of the evaluation of protection layer on these materials. The experimental programme comprised the adhesion of sulphur polymer composite layer to rebars under tension and bending, adjacent adhesion of sulphur polymer composite layer to reinforcing bars, adjacent adhesion of sulphur polymer composite to rebars in pushed-out test, adjacent adhesion of concrete to rebars coated with sulphur polymer composite, and mass loss of plain rebars in aqueous solutions of acids, hydroxides and salts and in water. In paper the usefulness of polymer sulphur composites to the surface protection against corrosion of the reinforcement have been evaluated.

PL

Przedstawiono rezultaty badań eksperymentalnych i analiz wykazujących przydatność polimerowych kompozytów siarkowych do ochrony przed korozją stali zbrojeniowej. W artykule podano skład materiału, rezultaty badanych właściwości i metodykę przeprowadzonych badań. Wybrano do dalszych badań polimerowy kompozyt siarkowy, charakteryzujący się najkorzystniejszymi, spośród badanych, właściwościami. Dokonano przeglądu literaturowego, między innymi, w zakresie wybranych zastosowań polimerowych kompozytów siarkowych w budownictwie, metod i sposobów powierzchniowej ochrony przed korozją stali zbrojeniowej, a także metod i sposobów oceny szczelności warstw zabezpieczających ten materiał przed korozją. Przeprowadzono badania eksperymentalne dla wybranych polimerowych kompozytów siarkowych. Program badań eksperymentalnych obejmował zbadanie: przyczepności warstwy polimerowego kompozytu siarkowego do prętów zbrojeniowych rozciąganych i zginanych, przyczepności stycznej warstwy polimerowego kompozytu siarkowego do prętów zbrojeniowych, przyczepności stycznej polimerowego kompozytu siarkowego do prętów zbrojeniowych wypychanych z tego kompozytu, przyczepności stycznej betonu do prętów zbrojeniowych pokrytych warstwą polimerowego kompozytu siarkowego i ubytku masy prętów zbrojeniowych gładkich w roztworach wodnych kwasów, wodorotlenków i soli oraz w wodzie. Wykazano przydatność polimerowych kompozytów siarkowych do powierzchniowej ochrony przed korozją stali zbrojeniowej.

8

Effect of abrasion on the air permeability & mass loss of breathable-coated fabrics

72%

Padleckienė I. , Petrulis D.

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tom Vol. 17, no. 2 (73)

50--54

EN

This paper presents a study on air permeability and relative mass loss in abraded breathable-coated fabrics. The abrasion treatment of different structured samples as well as the outer and reverse sides of specimens was done on a Martindale tester, varying the number of abrasion cycles. Considerable attention was devoted to the importance of the coating and textile substrate abrasion. Trends in the relationships between the abrasion cycles and the above-mentioned properties of the coated fabrics are discussed. The results support the nonlinear function approach nonlinear function.

PL

Artykuł przedstawia badania przepuszczalności powietrza względnych strat masy oddychających tkanin membranowych poddanych ścieraniu. Ścieraniu poddano zróżnicowane próbki tkanin po obydwu stronach. Stosowano urządzenie Martindale zmieniając ilość cykli ścierania. Specjalną uwagę poświęcono ścieraniu warstwy pokrycia. Przedyskutowano tendencje w zależnościach pomiędzy ilością cykli ścierania i właściwościami tkanin. wyniki badań wskazują na istnienie zależności nieliniowych.

9

Biosuszenie pofermentu z biogazowni rolniczych

72%

Białowiec A. , Wiśniewski D. , Pulka J. , Siudak M. , Jakubowski B. , Myślak B.

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2015

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tom Tom 17, cz. 2

1554--1568

EN

Anaerobic digestion residue represents a nutrient rich resource which, if applied back on land, can reduce the use of mineral fertilizers and improve soil fertility. However, dewatering of digestate may be recommended in certain situation. Limited applicability of digestate as fertilizer may appear, especially in winter, during the vegetation period or in areas where advanced eutrophication of arable land and water bodies is developing. The use of digestate may be also governed by different laws depending on whether it is treated as fertilizer, sewage sludge or waste. The solution for thus problem may by application of biodrying process. The aim of this paper is to present the possibilities of digestate from agricultural biogas plant drying in biodrying process, and analysis of its kinetic and efficiency. Dewatered digestate from agricultural biogas plant, with initial moisture of 78%, was mixed with wood chips in proportion 45:55, respectively. The mixture was placed in container reactor, and aerated during 4 weeks. During the experiment the temperature in the reactor, weight of the digestate, and energy demand was measured. Due to biodrying process, with mean air flow rate 0.025 m3/kg.h, 502 kg mass loss was achieved, what consists 76% of the initial weight of the digestate. Mean temperature in the bioreactor during first 10 days, fluctuated between 55 to 60°C. After that, gradual decrease of the temperature to 40°C in the end of 3rd week was observed. During last week the intense cooling of the bioreactor to final temperature below 20°C was observed. It was determined, that digestate mass loss had I-order reaction character. The k constant rate value was estimated, which was on the level of 0.00068 [1/h]. Total energy demand was 14.792 kWh, what relates to 0.0295 kWh of used energy per kg of mass removed.

10

The Role and Effectiveness of the MBP Installation in Poland Based on Selected Examples

72%

Wiśniewska M. , Lelicińska-Serafin K.

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2019

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tom Vol. 29, no. 2

1--12

EN

The paper presents examples of installations for the mechanical and biological treatment of municipal waste in Poland. Each of the presented installations is defined as a regional municipal waste treatment installation (RIPOK). Their technological solutions and work efficiency have been compared in this study. In addition, the loss of waste mass as a result of processes occurring in the biological part of individual installations was calculated in the research. The paper refers to the National Waste Management Plan (KPGO 2022) regarding the circular economy. As intended by the circular economy, MBP installations will be transformed into installations that will treat selectively collected municipal waste and become Regional Recycling Centers (RCR).

11

An attempt to apply a pullulan coating to reduce oxidative changes and mass loss in nuts during storage

72%

Chlebowska-Smigiel A. , Gniewosz M. , Gaszewska M.

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nr 1

EN

Samples of peanuts, hazelnuts and walnuts were covered with a pullulan coating prepared from 10% anhydrous solution of pullulan. The pullulan was obtained from a batch culture of a white mutant of Aureobasidium pullulans B-1. Over 90 days of nuts storage at a room temperature, analyses were carried out for changes in the acid and peroxide numbers of fat extracted from the nuts, as well as for changes in nut mass loss. The pullulan coating applied was found to exert a positive impact on the reduction of physicochemical changes occurring in the stored nuts. It inhibited processes of hydrolytic rancidity and oxidation of fat of the nuts. It had especially beneficial effect on walnuts, in which it inhibited the negative changes in lipids over the entire storage period. It was also observed that mass losses of the coated nuts were smaller and occurred in substantially shorter time span as compared to the uncoated nuts.

PL

Próbki orzechów arachidowych, laskowych i włoskich powleczono powłoką pullulanową sporządzoną z 10% wodnego roztworu pullulanu. Pullulan otrzymano z hodowli wgłębnej białego mutanta Aureobasidium pullulans B-1. Podczas 90 dni przechowywania orzechów w temperaturze pokojowej badano zmiany liczby kwasowej i nadtlenkowej w tłuszczu wyekstrahowanym z orzechów, a także zmiany ubytków masy orzechów. Stwierdzono, że zastosowana powłoka pullulanowa korzystnie wpłynęła na ograniczenie procesów utleniania tłuszczu w przechowywanych orzechach (szczególnie w orzechach włoskich). Ubytki masy orzechów powleczonych były mniejsze niż w orzechach niepowleczonych.

12

Quality of kohlrabi stems (Brassica oleracea var. gongylodes L.) kept in cold storage

58%

Gaweda M. , Niziol-Lukaszewska Z.

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nr 2

13

Effect of thermomechanical modification of Scots pine (Pinus sylvestris L.) wood on machine sanding efficiency

58%

Gruszczynski D. , Szymanowski K.

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

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2022

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tom 118

14

Nakłady energetyczne poniesione przy obieraniu mechanicznym bulw ziemniaka

58%

Krzysztofik B. , Nawara P. , Szecówka P.

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2004

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tom R. 8, nr 3, t. 1

267--275

PL

Przedstawiono wyniki badań dotyczące poboru mocy podczas mechanicznego obieranie bulw ziemniaka. Badaniami objęto bulwy kształtne i zdeformowane, trzech odmian ziemniaka, uprawianych na glebie brunatnej przy zastosowaniu czterech form nawozów plus kontrola. Straty masy bulw podczas obierania były istotnie ujemnie skorelowane z zawartością suchej masy. Moc zużywana podczas obierania ziemniaków nie zależała od badanych czynników jak również od deformacji bulw.

EN

The work presents results of the analyses of power consumption during mechanical peeling of potato bulbs. The analysis covered well-proportioned and deformed bulbs of three potato variations, cultivated on brown soil using four types of fertilizers with inspection. The loss of bulb mass during peeling process was significantly negatively correlated with the dry matter content. The power consumed during potato peeling did not depend on either the analyzed factors or the bulb deformation.

15

Koszty zbioru burakow cukrowych w gospodarstwach wielkoobszarowych

51%

Przybyl J.

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1997

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nr 202

289-294

16

Wlasciwosci fizyczne ziarna kukurydzy cukrowej w aspekcie jego mechanicznego odcinania

36%

Szymanek M. , Niedziolka I. , Dobrzanski B.

Acta Agrophysica. Rozprawy i Monografie

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2004

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nr 4[107]

1-77