15 research outputs found
Variable speed drives without mechanical gears in high speed and high torque applications
In this article we want to describe the newest solutions of variable speed drives, which allow to achieve high output speeds without mechanical gear for high power units. Additinally we will describe also solutions of drive applications without mechanical gear for high output torque drives. These solutions increase efficiency of the driven equipment
New trends in protection of frequency converters supply networks against high harmonics of current and voltage
The purpose of this article is to explain of actual solutions and standards regarding low frequency distortions of supply network caused by power electronics of drive devices especially by voltage source frequency converters
Application of Variable Speed Drives for High Power Fans in Power Plants
The content of the article is review of applications of variable speed drive systems for fans in power industry made by Siemens sp. z o.o. in the past few years. The article summarizes experience gained in applications, describes contemporary trends in such applications with particular reference to very high power fans.Artyku艂 zawiera przegl膮d zastosowa艅 przez Siemens sp. z o.o. uk艂ad贸w nap臋dowych z regulacj膮 cz臋stotliwo艣ciow膮 do nap臋du wentylator贸w w energetyce zawodowej w ci膮gu ostatnich kilkunastu lat. Artyku艂 podsumowuje do艣wiadczenia aplikacyjne oraz przybli偶a wsp贸艂czesne trendy w tego typu aplikacjach ze szczeg贸lnym uwzgl臋dnieniem wentylator贸w bardzo du偶ych mocy
The economical and technical consequences of applying variable speed drives for pumps in the heating plants
The paper presents the results of applying the variable speed drives as a drives for main pumps in the heating plants and systems. Using only variable-speed drives don't guarantee the good results and efficiency. Also, very important are the good parameters of the pump and technology of water systems. The paper presents the application of the new drives in the 300 MW heating plants. In the first step the head of pumps had been changed, the next technology systems and in the end the two 900 kW electric power drives were mounted. Also the possibilities for quick reaction and adjustable of pumps were upgraded. The article also presents the details of configuration of variable-speed drives installed in the heating plants. The results of the one year work and economical effects have been described. The financial effects are about a half million PLN per year
Experiences in commissioning and operation of variable speed drives of feed water pumps in speed range 3000 to 4600 PM
Article presents experiences in commissioning and operation of feed water pumps operating in speed range 3000 to 4600 rpm. Speed regulation is accomplished by frequency converters. In the article main parameters of the application was described, energetic analysis was done and behavior of the application in different states of supply was described
The wheel chair as indispensable instrumentation for disabled people
Nowoczesne metody rehabilitacji nie zast膮pi膮 adaptacji pacjenta do w贸zka inwalidzkiego oraz nauki poruszania si臋 na nim. W贸zek inwalidzki stanowi podstaw臋 lokomocji dla os贸b ze znacznym uszkodzeniem rdzenia oraz dla pacjent贸w paraplegik贸w z nie-wielkimi niedow艂adami, ale obci膮偶onych wsp贸艂istniej膮cymi chorobami uk艂adu kr膮偶enia i oddechowego. Istotny element stanowi wyposa偶enie pacjenta w odpowiedni w贸zek i poduszk臋 przeciwodle偶ynow膮. Wszystkie dzia艂ania maj膮 na celu przeciwstawienie si臋 statycznemu trybowi 偶ycia osoby po urazie rdzenia kr臋gowego, zwi臋kszenie niezale偶no艣ci funkcjonalnej, poprawienie jako艣ci 偶ycia i profilaktyk臋 powik艂a艅 medycznych.The modern methods can not replace the adaptation of a patient toa wheel chair and education on its operation. The wheel chair is still the basis of locomotion for people with considerable spinal cord damage, as well as for patients-paraplegics with small paresis, but who are loaded with co-existing illnesses of circulatory and respiratory systems. The essential element in rehabilitation is patient's equipment and ortopedic supports, such as: a wheel chair and anti-decubitus ulcers pillows. The aim of all of these activities is to prevent the static lifestyle of paraplegics, to improve the quality of life and to prevent medical complications
The use of ultrasound in the treatment of defects and rebuilding of bones. literature review
Terapia ultrad藕wi臋kowa jest obecnie szeroko dost臋pna oraz stosowana w fizjoterapii i medycynie sportowej. Pulsacyjne ultrad藕wi臋ki niskiej cz臋stotliwo艣ci LIPUS (ang. low-intesity pulsed ultrasound) nie powoduj膮 zmian termicznych. Badania kliniczne, zgodne z medycyn膮 opart膮 na faktach, potwierdzi艂y mo偶liwo艣膰 ich zastosowania w procesie zrostu kostnego. Celem pracy jest przegl膮d obecnego stanu wiedzy na temat LIPUS. Do bada艅 wykorzystano platform臋 Web of Knowledge. U偶ywanym j臋zykiem by艂 j臋zyk angielski. Jako opcje wyszukiwania zosta艂y u偶yte r贸偶ne kombinacje s艂贸w kluczowych: LIPUS, bone, soft tissue, healing. Wyszukiwania zosta艂y zaw臋偶one do publikacji z ostatnich 10 lat z w艂膮czon膮 lematyzacj膮. 10 prac zosta艂o ocenionych pod k膮tem skuteczno艣ci randomizacji dla potrzeb medycyny opartej na faktach. Badania, g艂贸wnie przedkliniczne, dowodz膮 przydatno艣ci stosowania LIPUS w przypadku op贸藕nionego zrostu kostnego lub jego braku. Jednak偶e niska warto艣膰 metodologiczna bada艅 nad zwierz臋tami b膮d藕 liniami kom贸rkowymi sugeruje potrzeb臋 dalszego kontynuowania prac.The ultrasound therapy is now widely available and used in physiotherapy and sports medicine. The low-intensity pulsed ultrasound (LIPUS) does not cause any thermal reactions. Clinical examination, conducted in accordance with the evidence-based medicine, has confirmed its applicability in the process of bone healing. The purpose of the review is to review the current state of knowledge on LIPUS. Web of Knowledge platform was exploited. The language used was English. Different combinations of keywords were used as the search options: LIPUS, bone, soft tissue, healing. The exploration was restricted to the publications from the last 10 years and included lemmatization. 10 papers were evaluated in terms of results efficacy of randomization for the evidence-based medicine purposes. The examination, mainly preclinical, proved the usefulness of LIPUS in the case of delayed union or non-union of bone. However, the low value of methodological studies on animals or cell lines suggests the need for further continuation of the work
Analysis of the influence of a metha-type metaphysical stem on biomechanical parameters
The full postoperative loading of the limb is possible if patients are properly selected and qualified for hip arthroplasty and the requirements as to the proper position of the metaphysial stem are met. The lack of precision, and patient qualification which does not satisfy the fixed criteria may result in stem setting inconsistent with the assumptions. An analysis based on the finite element method (FEM) will enable one to find out how to plan the magnitude of operated joint loading on the basis of the position of the stem in the postoperative radiograph. By analyzing the distribution of bone tissue deformations one can identify the zones where the spongy bone is overloaded and determine the strain level in comparison with the one determined for a model of the bone with the stem in proper position. On the basis of the results obtained one can estimate the range of loads for the operated limb, which will not result in the loss of the stem鈥檚 primary stability prior to obtaining secondary stability through osteointegration. Moreover, an analysis of the formation of bone structures around the stem showed that the incorrect setting of a Metha-type stem may lead to the initiation of loosening
The use of kinesiotaping in the after trauma therapy of damaged peroneus nerve - case description
Celem pracy jest przedstawienie mo偶liwo艣ci zastosowania i wykorzystania kinesiotapingu jako metody wspomagaj膮cej fizjoterapi臋 pacjent贸w z uszkodzeniami obwodowego uk艂adu nerwowego. W Polsce kinesiotaping jest jak na razie technik膮 rzadko stosowan膮 w leczeniu usprawniaj膮cym. W pracy opisano przypadek 39-letniej pacjentki z uszkodzeniem nerwu strza艂kowego prawego, poddanej terapii w Poradni Rehabilitacyjnej Przychodni "Stab艂owice" Samodzielnego Publicznego Zespo艂u Opieki Zdrowotnej Wroc艂aw Fabryczna. W terapii zastosowano elementy r贸偶nych metod fizjoterapeutycznych i zabiegi fizykalne. Metoda kinesiotapingu by艂a stosowana przez 3 miesi膮ce. W wyniku terapii uzyskano symetri臋 ruchu, stabilizacj臋 stawu skokowego, zwi臋kszenie zakresu ruchomo艣ci stopy i palc贸w, zmniejszenie obrz臋ku stopy i podudzia, zmniejszenie objaw贸w niedoczulicy oraz popraw臋 jako艣ci 偶ycia pacjentki. Zastosowanie metody kinesiotapingu w uszkodzeniach obwodowego uk艂adu nerwowego pozwala przyspieszy膰 proces usprawniania.The aim of the presented work is to examine the possibility of using kinesiotaping as a method of supporting physiotherapy of the patients with neural system damage. So far, kinesiotaping is not popular therapeutic method in Poland. The 39 year-old patent suffering from a right peroneus nerve injury was treated in the rehabilitation ambulatory in Wroclaw. Various physiotherapuetical methods and physical procedures were used in the therapy. Kinesiotaping was applied for three months. The results of the therapy included improvement of the symmetry of movement, stabilization of the tarsal joint, a significant increase of the foot and fingers mobility, the decrease of oedema, decrease of hypaestesia symptoms and improvement of life quality
Healthy lifestyle and degenerative joints disease
Badania epidemiologiczne wykazuj膮, 偶e zmiany stylu 偶ycia mog膮 mie膰 decyduj膮cy wp艂yw na kondycj臋 zdrowotn膮 spo艂ecze艅stwa. Celem pracy jest przedstawienie postaw wobec problemu stanu zdrowia i zdrowego stylu 偶ycia. Badaniem obj臋to 52 pacjent贸w w wieku od 21 do 72 lat. W badanej grupie zaobserwowano niski wska藕nik os贸b korzystaj膮cych z aktywnych form sp臋dzania wolnego czasu, kt贸re nie wi膮za艂y zdrowego stylu 偶ycia ze sposobem od偶ywiania si臋 i aktywno艣ci膮 fizyczn膮. Na podstawie otrzymanych wynik贸w wydaje si臋 niezb臋dne podj臋cie skuteczniejszych dzia艂a艅 edukacyjnych.The epidemiological research shows that the changes of the lifestyle can vastly affect the health of the society. The aim of this paper is to present various approaches towards the health and the healthy lifestyle. 52 patients, aged between 21 and 72 years old, were subjected to examination. The research group showed a low number of people who spend their free-time in an active way. The participants did not find any connection between a healty lifestyle and their nutrition habits or physical activity. It appears to be necessary to start more effective educational activity