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Tytuł:
Analysis of bent timber beam reinforcement with the application of composite materials
Analiza wzmocnień zginanych belek drewnianych z zastosowaniem materiałów kompozytowych
Autorzy:
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/402195.pdf
Data publikacji:
2016
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
timber
composite materials
reinforcement analysis
drewno
kompozyty
analiza zbrojenia
Opis:
The paper discusses timber frame reinforcement with the application of fiber composites and analyzes the results of the conducted studies. The notion of composite materials and their impact on the frame’s load bearing capacity and rigidity have been defined. The following issues have been discussed: the techniques of reinforcing timber beams, measuring the size of deflection for different load levels, destructive load, timber and tape deformation.
Źródło:
Structure and Environment; 2016, 8, 1; 10-16
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Defects in structural timber
Wady drewna konstrukcyjnego
Autorzy:
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/402203.pdf
Data publikacji:
2017
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
timber
wood defects
knots
cracks
resin pockets
stains
rots
insect channels
wanes
twisted fibres
curves
sclerenchyma fibres
drewno
wady drewna
sęki
pęknięcia
pęcherze żywiczne
zabarwienia
zgnilizna
chodniki owadzie
obliny
skręt włókien
krzywizny
twardzica
Opis:
The paper presents the defects that are typically found in structural timber. The model of the so-called flawless timber has been made more precise. Additionally, the impact of defects on timber quality was characterised. Defect classification with respect to the time of formation, type and causes was presented. The following defects were discussed in a detailed manner: knots, twisted fibres, cracks, resin pockets, stains, rots, insect channels, wanes, shape defects and sclerenchyma fibres. The main objective of the paper is to show actual imperfections in the conifer wood revealed in the examined elements. The cross-sections of round timber and construction and structural sawn timber were analysed.
W artykule przedstawiono typowe wady drewna konstrukcyjnego. Przybliżone zostały wzorce tzw. drewna bezbłędnego. Scharakteryzowano również wpływ wad na jakość drewna oraz ich podział w odniesieniu do czasu powstania, rodzaju uszkodzeń i ich przyczyn. Szczegółowo zilustrowano sęki, skręt włókien, pęknięcia, pęcherze żywiczne, zabarwienia, zgnilizny, chodniki owadzie, obliny, wady kształtu oraz twardzicę. Głównym celem pracy jest ukazanie rzeczywistych niedoskonałości przebadanych elementów z drewna iglastego. Przeanalizowano przekroje drewna okrągłego oraz tarcicy budowlano-konstrukcyjnej.
Źródło:
Structure and Environment; 2017, 9, 2; 112-122
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sperm epigenetic profile and risk of cancer
Autorzy:
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/3579.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Tematy:
sperm
epigenetics
disease risk
cancer
DNA damage
methylation
Opis:
Introduction and objective. The integrity, stability and composition of sperm chromatin are of great importance in the fertilizing potential of male gametes and their capacity to support normal embryonic development. In this study, the author presents the current state of knowledge about the sperm epigenetic profile and risk of cancer. Abbreviated description of the state of knowledge. The obtaining of pregnancy and the state of health of the baby depends on the quality of the genetic material of both the female and the male. Health behaviours and environmental factors directly affect the quality of sperm, as well as the human egg cell and, consequently, on the reproductive capabilities, the course of pregnancy and the state of the newborn. There exist two thoroughly investigated epigenetic modifications: DNA methylation and histone modifications. The process of DNA methylation can be also a fundamental factor contributing to the development of cancer, where epigenotype undergoes significant modifications. When considering numerous DNA aberrations in the male gamete, the most commonly encountered is DNA fragmentation, particularly in infertile subjects. Surprisingly, an intracytoplasmatic sperm injection study of mice oocytes, using spermatozoa with a high DNA Fragmentation Index (DFI), revealed that a considerable percentage of adults born as a result of this method, showed a significant increase in the incidence of abnormal behavioural tests, malformations, cancer and signs of premature aging. Summary. The issue of assisted procreation raises the need to look for an appropriate treatment for males with sperm chromatin abnormalities. As a result, the fight against smoking addiction becomes the obvious necessity. Moreover, the reasonable solution nowadays seems to be supplementation with micronutrients and folic acid. It has been proved that the process of DNA fragmentation is a phenomenon that intensifies over time. Therefore, there should be a pursuance for, as close as possible, to the moment of ejaculation, application of semen to reproductive techniques. Finally, epigenetic changes are suspected of being one of the factors responsible for the deterioration of male sperm parameters observed in recent decades.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2014, 08, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Strength and structural properties of structural timber
Właściwości strukturalno-wytrzymałościowe drewna konstrukcyjnego
Autorzy:
Rudziński, L.
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/402209.pdf
Data publikacji:
2016
Wydawca:
Politechnika Świętokrzyska w Kielcach. Wydawnictwo PŚw
Tematy:
timber
macroscopic and microscopic structure
physical and mechanical properties
moisture
Poland's nature and forest lands
fresh and dried sawn timber
artificial drying
sorting in terms of strength
drewno
struktura makroskopowa i mikroskopowa
właściwości fizyczne i mechaniczne
wilgotność
przyrodniczo-leśne tereny Polski
świeża i suszona tarcica
suszenie sztuczne
sortowanie pod względem wytrzymałości
Opis:
Taking into account the growing significance of structural timber in the building industry, the paper aims at defining the selected mechanical and physical properties of the Polish pine structural sawn timber from four nature and forest lands: Land A – Mazovian-Podlasian Nature and Forest Land (Forest District Garwolin), Land B – Little Poland Nature and Forest Land (Forest District Przedbórz), Land C – Silesian Nature and Forest Land (Forest District Kedzierzyn Koźle), Land D – Carpathian Nature and Forest Land (Forest District Piwniczna) [4]. The paper presents the definition of timber, its macroscopic and microscopic structure as well as factors affecting the mechanical properties of timber such as moisture or structural defects. The conducted tests involved sorting sawn timber in terms of strength using visual method according to the PN-D-94021 standard as well as characterizing the average moisture of the fresh and artificially dried sortment [6-8].
Źródło:
Structure and Environment; 2016, 8, 2; 103-108
2081-1500
Pojawia się w:
Structure and Environment
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the effect of using mobile phones on male fertility
Autorzy:
Wdowiak, A
Wdowiak, L.
Wiktor, H.
Powiązania:
https://bibliotekanauki.pl/articles/52101.pdf
Data publikacji:
2007
Wydawca:
Instytut Medycyny Wsi
Tematy:
human health
sperm cell
structure
electromagnetic wave
male fertility
male
mobile telecommunication zob.mobile telephony system
mobile telephony system
living organism
mobile phone
motility
Opis:
The problem of the lack of offspring is a phenomenon concerning approximately 15% of married couples in Poland. Infertility is defi ned as inability to conceive after a year of sexual intercourses without the use of contraceptives. In half of the cases the causative factor is the male. Males are exposed to the effect of various environmental factors, which may decrease their reproductive capabilities. A decrease in male fertility is a phenomenon which occurs within years, which may suggest that one of the reasons for the decrease in semen parameters is the effect of the development of techniques in the surrounding environment. A hazardous effect on male fertility may be manifested by a decrease in the amount of sperm cells, disorders in their mobility, as well as structure. The causative agents may be chemical substances, ionizing radiation, stress, as well as electromagnetic waves. The objective of the study was the determination of the effect of the usage of cellular phones on the fertility of males subjected to marital infertility therapy. The following groups were selected from among 304 males covered by the study: Group A: 99 patients who did not use mobile phones, Group B: 157 males who have used GSM equipment sporadically for the period of 1-2 years, and Group C: 48 people who have been regularly using mobile phone for more than 2 years. In the analysis of the effect of GSM equipment on the semen it was noted that an increase in the percentage of sperm cells of abnormal morphology is associated with the duration of exposure to the waves emitted by the GSM phone. It was also confi rmed that a decrease in the percentage of sperm cells in vital progressing motility in the semen is correlated with the frequency of using mobile phones.
Źródło:
Annals of Agricultural and Environmental Medicine; 2007, 14, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of trace metals in follicular fluid in ICSI-treated patients
Autorzy:
Wdowiak, A.
Wdowiak, E.
Bojar, I.
Powiązania:
https://bibliotekanauki.pl/articles/2081685.pdf
Data publikacji:
2018
Wydawca:
Instytut Medycyny Wsi
Tematy:
trace metals
intracytoplasmic sperm injection (ICSI)
embryo development dynamics
time-lapse monitoring
follicular fluid
Opis:
This study investigated the influence of cadmium (Cd), copper (Cu), iron (Fe), lead (Pb), selenium (Se), and zinc (Zn) in follicular fluid on the effectiveness of in vitro fertilization (IVF) treatment and the dynamics of embryo development. The study involved 221 women aged 25–35 years in whom intracytoplasmic sperm injection (ICSI) was performed. Analysis of the effects of the average concentrations of Se, Zn, and Cu on the developmental dynamics of embryos showed that higher concentrations of these metals were accompanied by shorter lead times for each of the various stages of development, while the reverse was true in the case of cadmium and lead. No relationship was observed between the mean concentrations of Fe and the dynamics of the human embryo. In order to discover whether the fact of becoming pregnant is affected by the investigated variables, a logistic regression model was applied. The dependent variable was the fact of achieving pregnancy, and the independent variable tested was the level of trace metals. Ultimately, only one variable remained statistically significant in the model: the level of Se.
Źródło:
Annals of Agricultural and Environmental Medicine; 2018, 25, 2; 213-218
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Maternal passive smoking during pregnancy and neonatal health
Autorzy:
Wdowiak, A
Wiktor, H.
Wdowiak, L.
Powiązania:
https://bibliotekanauki.pl/articles/50267.pdf
Data publikacji:
2009
Wydawca:
Instytut Medycyny Wsi
Tematy:
maternal passive smoking
neonatal health
pregnancy
woman
Lublin region
Polska
newborn child
Źródło:
Annals of Agricultural and Environmental Medicine; 2009, 16, 2; 309-312
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Superoxide dismutase and glutathione peroxidase activity in pregnancy complicated by diabetes
Autorzy:
Wdowiak, A.
Brzozowski, I.
Bojar, I.
Powiązania:
https://bibliotekanauki.pl/articles/50976.pdf
Data publikacji:
2015
Wydawca:
Instytut Medycyny Wsi
Źródło:
Annals of Agricultural and Environmental Medicine; 2015, 22, 2
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Effect of ionizing radiation on the male reproductive system
Autorzy:
Wdowiak, A.
Skrzypek, M.
Stec, M.
Panasiuk, L.
Powiązania:
https://bibliotekanauki.pl/articles/2083104.pdf
Data publikacji:
2019
Wydawca:
Instytut Medycyny Wsi
Tematy:
radiation protection
ionizing radiation
male fertility
human reproductive function
medical exposure
natural exposure
Opis:
Introduction and objective. In the light of current data concerning the growing exposure to ionizing radiation (IR) originating from atrificial sources, especially from medical ones, and also related to occupational exposure, it is justifiable to systematize the state of knowledge concerning the effect of IR on the male reproductive system. Brief description of the state of knowledge. There is no basis for the application of the hypothesis of hormesis in the area of male reproductive health. Regarding the impact of IR on spermatogenesis, spermatogonia are less susceptible to the occurrence of DNA damage after exposition to IR, but are characterized by slower DNA repair compared to somatic cells. Damage to the genes after exposure to IR is possible at each stage of spermatogenesis; however, haploidal spermatids show the highest radiosensitivity in this respect. The genetic risk of the cells differentiating during spermatogenesis is limited to one cycle of spermatogenesis, whereas the genetic instability may persist for the whole period of life, and DNA damage induced by IR may be transmitted to future generations. The minimum dose causing detectable DNA damage was 30 Gy. While exceeding this dose, the number of single-strand DNA breaks increases. Among males exposed to IR, a decrease was observed in sperm motility and in the percentage of morphologically normal spermatozoa as well as in an intensification of vacuolization. The genetic material in the sperm of these males showed higher fragmentation and methylation of genomic DNA. Conclusion. In the context of the epidemiological situation concerning the prevalence of infertility, while assessing the health effects of exposure to IR from artificial, including medical sources, the reproductive risk should be considered.
Źródło:
Annals of Agricultural and Environmental Medicine; 2019, 26, 2; 210-216
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Nicotinism and quality of embryos obtained in in-vitro fertilization programmes
Autorzy:
Wdowiak, A.
Lewicka, M.
Plewka, K.
Bakalczuk, G.
Powiązania:
https://bibliotekanauki.pl/articles/51164.pdf
Data publikacji:
2013
Wydawca:
Instytut Medycyny Wsi
Opis:
Introduction: According to the World Health Organization, infertility is defined as the inability to conceive following 12 months of regular unprotected sexual intercourse. Cigarette smoking, alcohol and drugs are the main stimulants exerting a negative effect on the male and female reproductive organs. Objective: The objective of the study was analysis of the effect of cigarette smoking by the women examined and their partners on the quality of embryos obtained in in vitro fertilization programmes. Material and methods: The study covered 54 women treated due to infertility. The database and statistical analyses were performed by means of computer software STATISTICA 7.1 (StatSoft, Poland). Results: The study showed that among 100% of the women examined, 24.07% smoked cigarettes. No statistically significant difference was observed between cigarette smoking by the women in the study (p=0.42), and the number of cigarettes smoked daily (p=0.52) and the total duration of smoking expressed in years (p=0.56). In addition, the study showed that 33.33% of respondents were exposed to passive nicotinism, while 66.67% were not exposed to passive smoking. In the group of women exposed to passive smoking, Class A embryos constituted 11.11%, Class B embryos – 83.38%, whereas Class C embryos – only 5.56%. A statistically significant relationship was noted between classes of embryos and exposure to passive nicotinism (p=0.03). Passive smoking results in the development of embryos of poorer quality. A significantly higher number of Class 2 embryos were produced from oocytes of women exposed to the effect of cigarette smoke, compared to Class 1. Among women at reproductive age, an active campaign should be carried out against nicotinism on behalf of their fertility and future maternity.
Źródło:
Annals of Agricultural and Environmental Medicine; 2013, 20, 1
1232-1966
Pojawia się w:
Annals of Agricultural and Environmental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Acceptance of diagnostic and therapeutic methods by married couples treated due to infertility
Autorzy:
Makara-Studzinska, M.
Morylowska-Topolska, J.
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/3582.pdf
Data publikacji:
2010
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2010, 04, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of effect of selected occupational factors on termination of pregnancy and state of the newborn
Autorzy:
Wdowiak, A.
Stec, M.
Iwanowicz-Palus, G.J.
Mroczkowski, A.
Powiązania:
https://bibliotekanauki.pl/articles/3083.pdf
Data publikacji:
2012
Wydawca:
Instytut Medycyny Wsi
Źródło:
Journal of Pre-Clinical and Clinical Research; 2012, 06, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sexual education from the view of high school students
Autorzy:
Bakalczuk, G.
Plaskota, A.
Lewicka, M.
Sulima, M.
Wdowiak, A.
Powiązania:
https://bibliotekanauki.pl/articles/3466.pdf
Data publikacji:
2014
Wydawca:
Instytut Medycyny Wsi
Tematy:
sex education
high school student
student
prophylaxis
midwife
culture
definition
Opis:
Introduction. Sexual education is still a non-defined area concerning the sex life of man. It is perceived differently depending on the country and its culture. In Poland, it should be implemented as part of ‘Family Life Education’. Objective. The aim of the research is to present the opinion of male and female high school students concerning sex education. Materials and methods. The research was conducted in 2014 on 450 male and female high school students in two provinces of Poland: 225 students from the Stanislaw Konarski High School in Mielec, Podkarpackie Province, and 225 from the Zbigniew Herbert High School in Lublin, Lubelskie province. Results. Close to half of the surveyed participated in a class ‘Family Life Education’ (48%); however, 32% and 22.9% were not satisfied with the class. Poor aspects of the subject were observed by the great majority of students (70%). Most of the youths (68.9%) desire a more complex approach to the subject, to be led by a medical specialist (68%). Conclusions. The students stated that sex education as part of ‘Family Life Education’ class is not satisfactory. They demand a specialist, medical knowledge of human sexuality. Parents, who should constitute a major source of information, had considerable influence in the sex education of their children.
Źródło:
Journal of Pre-Clinical and Clinical Research; 2014, 08, 2
1898-2395
Pojawia się w:
Journal of Pre-Clinical and Clinical Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 38

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