45 research outputs found
Correlation between the Quality of Attention and Cognitive Competence with Motor Action in Stroke Patients
It is considered that cognitive function and attention could affect walking, motion control, and proper conduct during the walk. To determine whether there is a difference in the quality of attention and cognitive ability in stroke patients and patients without neurological damage of similar age and education and to determine whether the connection of attention and cognition affects motor skills, the sample consisted of 50 stroke patients tested with hemiparesis, involved in the process of rehabilitation, and 50 persons, randomly chosen, without neurological damage. The survey used the following tests: Trail Making (TMT A B) test for assessing the flexibility of attention; Mini-Mental State Examination (MMSE) for cognitive status; Functional Ambulation Category (FAC) test to assess the functional status and parameters of walk: speed, frequency, and length of stride; STEP test for assessing the precision of movement and balance. With stroke patients, relationship between age and performance on the MMSE test was marginally significant. The ratio of performance to TMT A B test and years does not indicate statistical significance, while statistical significance between the MMSE test performance and education exists. In stroke patients, performance on MMSE test is correlated with the frequency and length of stride walk. The quality of cognitive function and attention is associated with motor skills but differs in stroke patients and people without neurological damage of similar age. The significance of this correlation can supplement research in neurorehabilitation, improve the quality of medical rehabilitation, and contribute to efficient recovery of these patients
Experimental study on the stresses at the i-beam end-plate moment connection
The paper deals with experimental study of the stresses at the bolted end-plate moment connection. The design parameters are adopted to include prying effects in joint. A stress level is obtained in the elements where the highest values occur in the tension zone of the end-plate. The accompanied finite element analysis is performed for comparing purposes with experimental results. It is shown that end-plate thickness should be the unavoidable joint parameter in structural analysis of frame-like structures
Evaluating the influence of classic and laparoscopic treatments of left displaced abomasum on the metabolic, hormonal and antioxidative status of high yielding dairy cows
Cilj istraživanja u ovoj doktorskoj disertaciji bio je da se uporede dve razliÄite metode tretmana dislokacije siriÅ”ta na levo (LDS) i da se ispita njihov efekat na promene vrednosti biohemijskih i hematoloÅ”kih parametara krvi, kao i koncentracija elektrolita, laktata, insulina i kortizola kod visokomleÄnih krava. Dodatni cilj bio je da se kod odabranih životinja utvrde parametri antioksidativne zaÅ”tite, kao i proizvodni i reproduktivni pokazatelji nakon razliÄitih tretmana ovog oboljenja.
Dvadeset Äetiri primipare i dvadeset Äetiri multipare krave holÅ”tajn rase, usklaÄene po paritetu teljenja i danima u laktaciji, rasporeÄene su u tri grupe: krave tretirane laparoskopskom abomazopeksijom u jednom koraku (LPS, n=16), krave tretirane metodom transabdominalne omentopeksije, laparotomija sa leve strane (LPT, n=16) i kontrolna grupa zdravih krava (KON, n=16). Dodatno, krave unutar LPS i LPT grupe su podeljene na podgrupe na osnovu pariteta teljenja, primipare LPS (LPSpp, n=8), primipare LPT (LPTpp, n=8), multipare LPS (LPSmp, n=8), mutipare LPT (LPTmp, n=8). KON grupa je takoÄe podeljena u podgrupe prema paritetu teljenja, kontrolna primipare (KONpp, n=8) i kontrolna multipare (KONmp, n=8). Krave kontrolne grupe su bile u istoj fazi laktacije kao i krave ogledne grupe. Uzorci krvi uzimani su pre (D0) i neposredno posle (D0') operacije, prvog (D1), treÄeg (D3), desetog (D10) i tridesetog (D30) dana nakon operacije.
U uzorcima krvnih seruma utvrÄene su vrednosti biohemijskih parametara: glukoze, BHBA, NEFA, ukupnih proteina, albumina, uree, ukupnog bilirubina, kalcijuma, fosfora, triglicerida, holesterola, lipoproteina velike gustine (HDL), laktata, aktivnost aspartat aminotransferaze (AST) i gama glutamil transferaze (g-GT), kao i koncentracija insulina i kortizola. U uzorcima pune krvi odreÄeni su hematoloÅ”ki parametri: broj eritrocita, koncentracija hemoglobina, hematokritska vrednost, srednja zapremina eritrocita (MCV), srednja koliÄina hemoglobina u eritrocitu (MCH), srednja koncentracija hemoglobina (MCHC), broj leukocita i broj trombocita, kao i koncentracija elektrolita: natrijuma (Na), kalijuma (K) i hlora (Cl). U svim uzorcima krvnih seruma odreÄena je aktivnost antioksidativnih enzima, paraoksonaze 1 (PON1) i mijeloperoksidaze (MPO), a praÄena je i oksido-redukciona sposobnost, preko DPPH testa.
Koncentracija glukoze kod primiparih i multiparih krava LPT grupe u D0' bila je znaÄajno veÄa (p<0,01) u odnosu na KON i LPS grupu. Kod LPS grupe primiparih krava koncentracija glukoze je bila znaÄajno veÄa (p<0,05) u odnosu na KON grupu, dok kod multiparih krava izmeÄu LPS i KON grupe nije bilo razlike. LPS i LPT grupe primiparih i multiparih krava imale su manju koncentraciju Ca u D0, D0', D1 i D3 (P<0,05; P<0,01, redom) u odnosu na KON grupe. Koncentracija bilirubina kod LPS i LPT grupa primiparih i multiparih krava u D0 i D0' bila je znaÄajno veÄa (p<0,01) u odnosu na KON grupe. Pored toga, LPT grupa multiparih krava u D3 imala je znaÄajno veÄu vrednost bilirubina u poreÄenju sa KON grupom (p<0,01). Aktivnost enzima AST je bila znaÄajno veÄa kod LPS i LPT grupe primiparih i multiparih krava u D0, D0' i D1 (p<0,05; p<0,01, redom) u odnosu na KON grupe, dok je znaÄajno veÄa aktivnost ovog enzima ustanovljena kod LPS i LPT grupe multiparih krava i u D3 (p<0,05; p<0,01, redom) u odnosu na KON grupu. Koncentracija HDL tokom Äitavog ogleda je bila znaÄajno manja (p<0,05; p<0,01) kod LPS i LPT grupe primiparih i multiparih krava u odnosu na vrednosti HDL kod KON grupa. Kod LPS i LPT grupe primiparih krava koncentracija BHBA u D0 bila je znaÄajno veÄa (p<0,05) u odnosu na KON grupu. Kod LPS i LPT grupe multiparih krava koncentracija BHBA u D0, D0' i D1 bila je znaÄajno veÄa (p<0,01) u odnosu na KON grupu. U D3 koncentracija BHBA kod LPS i LPT grupe multiparih krava je bila znaÄajno veÄa (p<0,05) u odnosu na KON grupu. Koncentracija NEFA je bila znaÄajno veÄa u D0, D0', i D1 kod LPS i LPT grupa primiparih i multiparih krava u odnosu na KON grupe (p<0,01; p<0,05, redom). LPS i LPT grupe
primiparih i multiparih krava imale su znaÄajno viÅ”u koncentraciju laktata u D0, D0', D1 i D3 (p<0,01; p<0,05, redom) u odnosu na KON grupu.
Koncentracija insulina u krvi LPS i LPT grupe primiparih krava u D0, D0' i D1 je bila znaÄajno manja (p<0,01) u odnosu na KON grupu. LPT grupa primiparih krava je imala znaÄajno manju (p<0,05) vrednost insulinemije u D3 u odnosu na KON grupu. Kod multiparih krava LPS i LPT grupe, koncentracija insulina u D0 i D0' je bila manja (p<0,05) u odnosu na vrednost insulina KON grupe. Koncentracija kortizola je bila znaÄajno viÅ”a kod LPS i LPT grupe primiparih i multiparih krava u D0 i D0' (p<0,01) u odnosu na KON grupu, dok je LPT grupa primiparih i multiparih krava imala znaÄajno viÅ”e vrednosti kortizola u D0' u odnosu na LPS grupu (p<0,05; p<0,01, redom).
Broj leukocita je bio znaÄajno manji u D0, kao i koncentracija Hb i vrednosti Ht u D0 i D0' u KON grupi primiparih krava u odnosu na LPS i LPT grupu primiparih krava (p<0,01; p<0,05, redom). Hiponatrijemija, hipohloremija i hipokalemija ustanovljene su u D0 i D0' kod LPS i LPT grupe primiparih i multiparih krava. Pored toga, LPT grupa primiparih krava imala je znaÄajno niže vrednosti koncentracije jona Na i Cl u D1 i D3 i niže vrednosti jona K u D1, u odnosu na KON grupu primiparih krava (p<0,01; p<0,05, redom). TakoÄe, LPT grupa multiparih krava imala je znaÄajno niže vrednosti jona Na, K, Cl u D1 i D3 u odnosu na KON grupu multiparih krava (p<0,01; p<0,05, redom).
Aktivnost enzima PON1 kod LPS i LPT grupa primiparih i multiparih krava u D0 i D1 bila je znaÄajno niža (p<0,01) u odnosu na KON grupe, dok je u D3 kod multiparih krava LPT grupe aktivnost enzima PON1 bila znaÄajno niža (p<0,05) u poreÄenju sa KON grupom. Aktivnosti MPO kod LPS i LPT grupa primiparih i multiparih krava u D0 bile su znaÄajno viÅ”e (p<0,05) u odnosu na KON grupe. Kod LPT grupa primiparih i multiparih krava u D1 aktivnost MPO je bila znaÄajno veÄa (p<0,01) u odnosu na KON grupe. U istom uzorkovanju aktivnost MPO kod LPT grupe je bila znaÄajno veÄa (p<0,01) u odnosu na LPS grupu. Do kraja ogleda aktivnost MPO je ostala znaÄajno viÅ”a kod LPT grupa u odnosu na KON i LPS grupe primiparih i multiparih krava (p<0,05; p<0,01, redom). PoÄetne vrednosti koncentracije DPPH grupa primiparih krava bile su znaÄajno niže (p<0,05) u odnosu na KON grupu. Do kraja ogleda kod primiparih krava jedino je desetog dana vrednost DPPH kod LPT grupe bila znaÄajno niža (p<0,05) u odnosu na KON grupu. ProseÄna poÄetna vrednost koncentracije DPPH u krvi kod LPS i LPT grupa multiparih krava bila je izjedaÄena. Nakon tretmana, od prvog dana do kraja ogleda vrednosti DPPH kod LPS i LPT grupe multiparih krava su bile znaÄajno veÄe (p<0,05) u odnosu na vrednosti KON grupe.
Primipare i multipare krave LPS i LPT grupa u D0, kao i LPT grupa primiparih krava i LPS i LPT grupa multiparih krava u D30 nakon operacije imale su nižu proizvodnju mleka u odnosu na krave KON grupe (p<0,05), dok je 60. dana laktacije kod LPS i LPT grupe multiparih krava koliÄina mleka bila znaÄajno manja (p<0,05) u poreÄenju sa KON grupom multiparih krava. Devedesetog dana laktacije koliÄina mleka kod LPT grupe multiparih krava bila je znaÄajno manja (p<0,05) u odnosu na KON i LPS grupu multiparih krava. Servis period je bio znaÄajno duži kod LPT grupe u odnosu na KON grupu primiparih krava (p<0,05).
Dobijeni rezultati su pokazali da primena laparoskopske metode ima potencijal da ubrza period oporavka nakon tretmana dislokacije siriÅ”ta na levo kod pimiparih i multiparih krava. Ovo je prvo istraživanje koje je pokazalo pozitivan efekat laparoskopije u jednom koraku u smanjenju postoperativnog stresa kod tretiranih grupa krava. Pored toga, rezultati su pokazali i druge prednosti laparoskopije u jednom koraku, kao Å”to su brže postoperativno uspostavljanje fizioloÅ”kih vrednosti elektrolita i biohemijskih parametara i veÄa proizvodnja mleka kod krava tretiranih ovom metodom
The influence of temperature on mechanical properties of the base material (BM) and welded joint (WJ) made of steel S690QL
This paper presents the analysis of the influence of temperature on mechanic properties of the base material and welded joints made of high strength steel. The joints were welded on S690QL high strength steel plates using the Metal Active Gas (MAG) Welding and two filler materials of different properties. Since the steel S690QL belongs to a group of steels with high strength, the aim of this paper is to determine the temperature at which strength starts to decrease. Experimental tensile testings of the welded joints were performed at five different temperatures in the range from 20 to 550 Ā°C
The influence of temperature on mechanical properties of the base material (BM) and welded joint (WJ) made of steel S690QL
This paper presents the analysis of the influence of temperature on mechanic properties of the base material and welded joints made of high strength steel. The joints were welded on S690QL high strength steel plates using the Metal Active Gas (MAG) Welding and two filler materials of different properties. Since the steel S690QL belongs to a group of steels with high strength, the aim of this paper is to determine the temperature at which strength starts to decrease. Experimental tensile testings of the welded joints were performed at five different temperatures in the range from 20 to 550 Ā°C
Selection of the optimal hard facing (HF) technology of damaged forging dies based on cooling time t8/5
In exploitation, the forging dies are exposed to heating up to very high temperatures, variable loads: compressive, impact and shear. In this paper, the reparatory hard facing of the damaged forging dies is considered. The objective was to establish the optimal reparatory technology based on cooling time t8/5 . The verification of the adopted technology was done by investigation of the hard faced layers microstructure and measurements of hardness within the welded layersā characteristic zones. Cooling time was determined theoretically, numerically and experimentally
Experimental and numerical study of temperature field during hard-facing of different carbon steels
In this research the 3-D transient non-linear thermal analysis of the hard-facing process was performed by using the experimental testing and finite element method. Testing was done at three different carbon steels and the obtained results were compared to one obtained by empirical formulas and welding recommendations. Experimental testing was done on hard faced specimens (plates) with different thickness. Temperatures and temperature cycles was measured by using thermocouples in order to determine maximal temperature and cooling time between 800 degrees C and 500 degrees C. After experimental testing the finite element method analysis was done. The simulations were executed on the open source platform Salome using the open source finite element solver Code Aster. The Gaussian double ellipsoid was selected in order to enable greater possibilities for the calculation of the moving heat source. The numerical results were compared with available experimental and mathematical results
Experimental and numerical study of temperature field during hard-facing of different carbon steels
In this research the 3-D transient non-linear thermal analysis of the hard-facing process was performed by using the experimental testing and finite element method. Testing was done at three different carbon steels and the obtained results were compared to one obtained by empirical formulas and welding recommendations. Experimental testing was done on hard faced specimens (plates) with different thickness. Temperatures and temperature cycles was measured by using thermocouples in order to determine maximal temperature and cooling time between 800 degrees C and 500 degrees C. After experimental testing the finite element method analysis was done. The simulations were executed on the open source platform Salome using the open source finite element solver Code Aster. The Gaussian double ellipsoid was selected in order to enable greater possibilities for the calculation of the moving heat source. The numerical results were compared with available experimental and mathematical results
Determination of bond strength between the hard-faced (HF) layer and the base material (BM) of forging dies
This paper points out complex working conditions of forging dies, which are the most frequent causes of their damage, and proposes suitable hard-facing repair procedures. The shear strength between the hard-faced layer and base metal has been measured using specially developed tool, and correlation between output results and the applied hard-facing technology is established
Physicochemical characterization of mineral mud from spa Vrujci
Mineralogical and physicochemical analysis of healing mud from spa Vrujci was
performed by ICP-OES analysis and FTIR and micro-Raman spectroscopy. The
therapeutic effect of mud was improved by plant extracts implementation