234 research outputs found
Soft-switching Inverter-fed Single-phase Collector Motor Drive
AbstractThis paper deals with the performance analysis of a hand power tool (HPT). The HPT is being driven by a single-phase collector motor drive fed by a PWM voltage source soft-switching inverter. A mathematical model of an electro-mechanic system of a HPT has been worked out. The dynamic model of an electric motor consists of a system of non-linear differential equations that include the resistance and dynamic inductance of an armature and field winding and spinning E.M.F. The proposed drive system is modeled and its performance is simulated in Matlab/Simulink. The simulation results show that a smaller switching loss and higher conversion efficiency are obtained by the proposed soft-switching inverter. The performance of the drive is improved by using voltage regulator when compared with direct connection to the voltage source
ΠΠ½Π³Π²ΠΈΠ½ΠΎ-ΡΠΊΡΠΎΡΠ°Π»Π½Π° Ρ Π΅ΡΠ½ΠΈΡΠ° Π½Π° ΠΌΠΎΡΠ΅Π½ ΠΌΠ΅ΡΡ
Herniation of urinary bladder through the inguinal canal is a rare disease that requires surgery. The resulting combination of failure of the abdominal wall and an increase in intra-abdominal pressure occurs prolapse of the urinary bladder in the inguinal canal and the occurrence of ingvino-scrotal hernia. This phenomenon is very rare and often misdiagnosed. It occurs more often in older men with increased body weight and symptoms of distal urinary obstruction and urinary infections. The symptoms usually are mild to moderate, associated with hindered urination and urinary infections, and if this condition promptly left untreated can lead to serious health problems, to renal failure. CT reconstruction in three planes is the method of choice in the diagnosis of ingvino-scrotal hernia of the bladder. This method provides a clear display of herniated part of the urinary bladder, and allows detection of the contents of the hernial sac.Π₯Π΅ΡΠ½ΠΈΡΠ°ΡΠΈΡΠ°ΡΠ° Π½Π° ΠΌΠΎΡΠ½ΠΈΠΎΡ ΠΌΠ΅ΡΡ ΠΏΡΠ΅ΠΊΡ ΠΈΠ½Π³Π²ΠΈΠ½Π°Π»Π½ΠΈΠΎΡ ΠΊΠ°Π½Π°Π» Π΅ ΡΠ΅ΡΠΊΠ° Π±ΠΎΠ»Π΅ΡΡ ΠΊΠΎΡΠ° Π±Π°ΡΠ° Ρ
ΠΈΡΡΡΡΠΊΠ° ΠΈΠ½ΡΠ΅ΡΠ²Π΅Π½ΡΠΈΡΠ°. ΠΠ°ΠΊΠΎ ΡΠ΅Π·ΡΠ»ΡΠ°Ρ Π½Π° ΠΊΠΎΠΌΠ±ΠΈΠ½Π°ΡΠΈΡΠ° Π½Π° ΡΠ»Π°Π±ΠΎΡΡ Π½Π° Π°Π±Π΄ΠΎΠΌΠΈΠ½Π°Π»Π½ΠΈΠΎΡ ΡΠΈΠ΄ΠΈ Π·Π³ΠΎΠ»Π΅ΠΌΡΠ²Π°ΡΠ΅ Π½Π° ΠΈΠ½ΡΡΠ°Π°Π±Π΄ΠΎΠΌΠΈΠ½Π°Π»Π½ΠΈΠΎΡ ΠΏΡΠΈΡΠΈΡΠΎΠΊ ΡΠ΅ ΡΠ°Π²ΡΠ²Π° ΠΏΡΠΎΠ»Π°ΠΏΡ Π½Π° ΠΌΠΎΡΠ½ΠΈΠΎΡ ΠΌΠ΅ΡΡ Π²ΠΎ ΠΈΠ½Π³Π²ΠΈΠ½Π°Π»Π½ΠΈΠΎΡ ΠΊΠ°Π½Π°Π» ΠΈ ΠΏΠΎΡΠ°Π²Π° Π½Π° ΠΈΠ½Π³Π²ΠΈΠ½ΠΎ-ΡΠΊΡΠΎΡΠ°Π»Π½Π° Ρ
Π΅ΡΠ½ΠΈΡΠ°. ΠΠ²Π°Π° ΠΏΠΎΡΠ°Π²Π° Π΅ ΠΌΠ½ΠΎΠ³Ρ ΡΠ΅ΡΠΊΠ° ΠΈ ΡΠ΅ΡΡΠΎ ΠΏΠΎΠ³ΡΠ΅ΡΠ½ΠΎ ΡΠ΅ Π΄ΠΈΡΠ°Π³Π½ΠΎΡΡΠΈΡΠΈΡΠ°. Π‘Π΅ ΡΠ°Π²ΡΠ²Π° ΠΏΠΎΡΠ΅ΡΡΠΎ ΠΊΠ°Ρ ΠΏΠΎΡΡΠ°ΡΠΈ ΠΌΠ°ΠΆΠΈ ΡΠΎ Π·Π³ΠΎΠ»Π΅ΠΌΠ΅Π½Π° ΡΠ΅Π»Π΅ΡΠ½Π° ΡΠ΅ΠΆΠΈΠ½Π° ΠΈ ΡΠΎ ΡΠΈΠΌΠΏΡΠΎΠΌΠΈ Π½Π° ΠΎΠΏΡΡΡΡΠΊΡΠΈΡΠ° Π½Π° Π΄ΠΈΡΡΠ°Π»Π½ΠΈΡΠ΅ ΡΡΠΈΠ½Π°ΡΠ½ΠΈ ΠΏΠ°ΡΠΈΡΠ°ΡΠ° ΠΈ ΡΡΠΈΠ½Π°ΡΠ½ΠΈ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ. Π‘ΠΈΠΌΠΏΡΠΎΠΌΠΈΡΠ΅ Π²ΠΎΠΎΠ±ΠΈΡΠ°Π΅Π½ΠΎ ΡΠ΅ ΠΎΠ΄ Π±Π»Π°Π³ΠΈ Π΄ΠΎ ΡΠΌΠ΅ΡΠ΅Π½ΠΈ, ΠΏΠΎΠ²ΡΠ·Π°Π½ΠΈ ΡΠ΅ ΡΠΎ ΠΎΡΠ΅ΠΆΠ½Π°ΡΠΎΡΠΎ ΠΌΠΎΠΊΡΠ΅ΡΠ΅ ΠΈ ΡΡΠΈΠ½Π°ΡΠ½ΠΈ ΠΈΠ½ΡΠ΅ΠΊΡΠΈΠΈ, Π° Π΄ΠΎΠΊΠΎΠ»ΠΊΡ ΠΎΠ²Π°Π° ΡΠΎΡΡΠΎΡΠ±Π° Π½Π°Π²ΡΠ΅ΠΌΠ΅Π½ΠΎ Π½Π΅ ΡΠ΅ Π»Π΅ΠΊΡΠ²Π° ΠΌΠΎΠΆΠ΅ Π΄Π° Π΄ΠΎΠ²Π΅Π΄Π΅ Π΄ΠΎ ΠΏΠΎΡΠ΅ΡΠΈΠΎΠ·Π½ΠΈ Π·Π΄ΡΠ°Π²ΡΡΠ²Π΅Π½ΠΈ ΠΏΡΠΎΠ±Π»Π΅ΠΌΠΈ, ΠΏΠ° ΡΠ΅ Π΄ΠΎ Π±ΡΠ±ΡΠ΅ΠΆΠ½Π° ΠΈΠ½ΡΡΡΠΈΡΠΈΠ΅Π½ΡΠΈΡΠ°. CT ΡΠΎ ΡΠ΅ΠΊΠΎΠ½ΡΡΡΡΠΊΡΠΈΡΠ° Π²ΠΎ ΡΡΠΈ ΡΠ°ΠΌΠ½ΠΈΠ½ΠΈ Π΅ ΠΌΠ΅ΡΠΎΠ΄Π° Π½Π° ΠΈΠ·Π±ΠΎΡ Π²ΠΎ Π΄ΠΈΡΠ°Π³Π½ΠΎΡΡΠΈΠΊΠ°ΡΠ° Π½Π° ΠΈΠ½Π³Π²ΠΈΠ½ΠΎ-ΡΠΊΡΠΎΡΠ°Π»Π½ΠΈΡΠ΅ Ρ
Π΅ΡΠ½ΠΈΠΈ Π½Π° ΠΌΠΎΡΠ½ΠΈΠΎΡ ΠΌΠ΅ΡΡ. ΠΠ²Π°Π° ΠΌΠ΅ΡΠΎΠ΄Π° ΠΎΠ²ΠΎΠ·ΠΌΠΎΠΆΡΠ²Π° ΡΠ°ΡΠ΅Π½ ΠΏΡΠΈΠΊΠ°Π· Π½Π° Ρ
Π΅ΡΠ½ΠΈΡΠ°Π½ΠΈΠΎΡ Π΄Π΅Π» ΠΎΠ΄ ΠΌΠΎΡΠ½ΠΈΠΎΡ ΠΌΠ΅ΡΡ, Π° ΠΎΠ²ΠΎΠ·ΠΌΠΎΠΆΡΠ²Π° ΠΈ Π΄Π΅ΡΠ΅ΠΊΡΠΈΡΠ° Π½Π° ΡΠΎΠ΄ΡΠΆΠΈΠ½Π°ΡΠ° Π½Π° ΠΊΠΈΠ»Π½Π°ΡΠ° ΠΊΠ΅ΡΠ°
Systems Evolutionary Biology of Waddingtonβs Canalization and Genetic Assimilation
In recent years, there has been growing interest in computer modeling of the evolution of gene and cell regulatory networks, in general, and in computational studies of the classic ideas of Baldwin, Schmalhausen, Waddington, and followers, in particular. Two related aspects of Waddingtonβs evolutionary theories are the concepts of canalization and of genetic assimilation. Canalization is associated with the robust development of an individual to diverse perturbations and noise, though, when fluctuations in developmental factors exceed a particular limit, the normal developmental trajectory can be βthrown outβ of the robust canal, resulting in an altered phenotype. If selective pressure favors the new phenotype, an initial individual loss of canalization can lead to phenotypic changes in the population (with canalization then becoming established for the new phenotype). Genetic assimilation is the subsequent genetic fixing of the new trait in the population. Recent experimental and theoretical works have established a quantitative basis for these classic concepts of Waddington; this chapter will review these new developments in systems evolutionary biology
Full-arch fixed overdenture in lower jaw - immediate solution for efficient mastication
Complete anodontia and alveolar ridge resorption are responsible for lack of retention and stabilization of conventional acrylic lower denture.
Hybrid prostheses on 4 implants placed immediately in the first 7 days is therapeutic solution which allows patients better chewing and increased effective masticatory force.
Aim: The study aims to assess the functional and subjective treatment outcomes of full-arch fixed overdenture hybrid rehabilitation.
Material and Methods: 60 patients with hybrid prostheses over 4 implants were included in the study. The measurement of the masticatory force was done in the chewing center in the projection of the distally placed implant. Electro-gnathic-dynamometer measured the force of the muscle elevator and depressor of the mandible. Sensor was placed in plastic bite templates and the force value was registered three times.
Results: The mean masticatory forces measured in the chewing center before implants and overdenture were 95.7 N. One month later with the prosthesis the value was increased to 185.6 N and after 18 months 186.2 N.
Conclusion: There is significant increase in masticatory force in area of ββthe distal implant. This is indicating increased resistance to load and higher efficiency of the chewing process after the treatment.
Keywords: overdenture, full-arch, hybrid prosthesi
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