29 research outputs found
Upper and lower absolutely continuous functions with applications to discontinuous differential equations
We use upper and lower absolutely continuous functions as subsolutions and supersolutions to discontinuous ordinary differential equations. We present sufficient conditions for the existence of extremal solutions to initial value problems. Due to a new notion of sub and supersolutions we generalize previous results and present elementary and relatively simple proofs
Effects of rehabilitation of persons with chronic low back pain and hypertension
Background The aim of this study was to evaluate the
effects of rehabilitation in patients with chronic low back
pain (CLBP) with concomitant hypertension and without
hypertension. Also been examined the effects of rehabilitation
in the case of high blood pressure with accompanying
coronary artery disease or heart failure.
Material and methods The study group included 535 individuals,
437 (81.7%) women and 98 (18.3%) men, aged
18–87 years (mean age 51.7 ± 17.2) treated with CLBP.
Among the study group in 214 (40%) patients had hypertension.
The effects of rehabilitation were evaluated for
reducing pain, improving mobility and quality of life. Pain,
improve transportation and quality of life was measured
on a 8 grade scale before and after rehabilitation.
Results The effects of rehabilitation in patients with CLBP
and hypertension did not differ in terms of pain (p =
0.374), locomotion (p = 0.96) and quality of life (p =
0.202) than patients without hypertension. Both in patients
with hypertension and without hypertension
after rehabilitation was a reduction in pain (p < 0.001),
improvement in locomotion (pWst臋p Nadci艣nienie t臋tnicze wyst臋puje bardzo cz臋sto
w艣r贸d chorych z innymi problemami zdrowotnymi,
r贸wnie偶 nie zwi膮zanymi z uk艂adem kr膮偶enia.
Znane zalecenia dotycz膮 raczej ewentualnej modyfikacji
leczenia hipotensyjnego; problem ewentualnego
zwi膮zku nadci艣nienia z efektywno艣ci膮 leczenia
innych chor贸b jest analizowany znacznie rzadziej.
Celem niniejszej pracy by艂a ocena efekt贸w rehabilitacji
pacjent贸w z przewlek艂ymi b贸lami dolnego odcinka
kr臋gos艂upa w zale偶no艣ci od wsp贸艂istnienia
nadci艣nienia t臋tniczego. Zbadano te偶 efekty rehabilitacji
w sytuacji wyst膮pienia nadci艣nienia t臋tniczego
z towarzysz膮c膮 chorob膮 wie艅cow膮 lub niewydolno艣ci膮
kr膮偶enia.
Materia艂 i metody Badaniem obj臋to grup臋 535 os贸b,
w tym 437 kobiet (81,7%) i 98 m臋偶czyzn (18,3%),
w wieku od 18 do 87 lat (艣redni wiek 51,7 ± 17,2 roku),
leczonych z powodu b贸l贸w dolnego odcinka kr臋gos艂upa.
Spo艣r贸d nich u 214 os贸b (40%) stwierdzono
nadci艣nienie t臋tnicze. Efekty rehabilitacji badano
pod k膮tem zmniejszenia dolegliwo艣ci b贸lowych, poprawy
mo偶liwo艣ci poruszania si臋 i poprawy jako艣ci
偶ycia. Odczuwanie b贸lu, lokomocj臋 i jako艣膰 偶ycia
mierzono w skali 8-stopniowej przed rehabilitacj膮
i po niej.
Wyniki Efekty rehabilitacji u os贸b z b贸lami dolnego
odcinka kr臋gos艂upa i nadci艣nieniem t臋tniczym nie
r贸偶ni艂y si臋 istotnie pod wzgl臋dem b贸lu (p = 0,374),
lokomocji (p = 0,96) i jako艣ci 偶ycia (p = 0,202) od
pacjent贸w bez nadci艣nienia t臋tniczego. Zar贸wno
w grupie os贸b z nadci艣nieniem t臋tniczym, jak i bez
niego po rehabilitacji stwierdzono zmniejszenie b贸lu
(p < 0,001), popraw臋 lokomocji (p < 0,001) i popraw臋
jako艣ci 偶ycia (p < 0,001). Wsp贸艂istnienie przewlek艂ych
b贸l贸w dolnego odcinka kr臋gos艂upa z nadci艣nieniem t臋tniczym i stabiln膮 chorob膮 wie艅cow膮 nie
ma wp艂ywu na efekty rehabilitacji w zakresie odczuwania
b贸lu (p = 0,281), lokomocji (p = 0,526)
i jako艣ci 偶ycia (p = 0,684). Wsp贸艂istnienie przewlek艂ych
b贸l贸w dolnego odcinka kr臋gos艂upa z nadci艣nieniem
t臋tniczym i wyr贸wnan膮 niewydolno艣ci膮
kr膮偶enia r贸wnie偶 nie ma wp艂ywu na efekty rehabilitacji
w zakresie odczuwania b贸lu (p = 0,411), lokomocji
(p = 0,318) i jako艣ci 偶ycia (p = 0,986).
Wnioski Efekty rehabilitacji os贸b z zespo艂em b贸lowym
dolnego odcinka kr臋gos艂upa i nadci艣nieniem
t臋tniczym s膮 por贸wnywalne z efektami rehabilitacji
u os贸b bez nadci艣nienia t臋tniczego.
Nadci艣nienie T臋tnicze 2011, tom 15, nr 3, strony 163–168
On the uniqueness of viscosity solutions for first order partial differential-functional equations
We consider viscosity solutions for first order differential-functional equations. Uniqueness theorems for initial, mixed, and boundary value problems are presented. Our theorems include some results for generalized ("almost everywhere") solutions
Parabolic differential-functional inequalities in viscosity sense
We consider viscosity solutions for second order differential-functional equations of parabolic type. Initial value and mixed problems are studied. Comparison theorems for subsolutions, supersolutions and solutions are considered
HOMOGENEITY OF TITANIUM MANUFACTURED BY SOLID STATE CHIPS RECYCLING: Received: 01st May 2021; Revised: 18th September 2021, 12th November 2021; Accepted: 13th November 2021
This work presents a promising method for recycling chips, carried out in the solid-state with the use of plastic working. High-purity (hp) titanium 99.99 chips after milling were subjected to a three-step procedure to transform these chips into a solid material. The objective of this work is to demonstrate the potential of this new processing method and to present the results of experiments conducted to determine the homogeneity of the final product. It was found that the processing method employed resulted in the formation of a solid and consolidated product in the form of a rod 8mm in diameter and 700mm long. The rod exhibited a grained microstructure typical of the Ti in the as-received state. Furthermore, the mechanical properties of the rod-product were also similar to those of titanium in the as-received state. For example, the hardness of the manufactured rod (average 97 HV10) was typical of the hardness of commercial Ti hp (94 HV10). In addition, the product obtained was characterized by adequate homogeneity in terms of its microstructure and mechanical properties. It was also found that the recycled material is as homogeneous as the commercial, reference Ti in the as-received state
Upper and lower absolutely continuous functions with applications to discontinuous differential equations
We use upper and lower absolutely continuous functions as subsolutions and supersolutions to discontinuous ordinary differential equations. We present sufficient conditions for the existence of extremal solutions to initial value problems. Due to a new notion of sub and supersolutions we generalize previous results and present elementary and relatively simple proofs