Intermittent behaviour of a Cracked Rotor in the resonance region

Vibrations of the Jeffcott rotor are modelled by a three degree of freedom system including coupling between lateral and torsional modes. The crack in a rotating shaft of the rotor is introduced via time dependent stiffness with off diagonal couplings. Applying the external torque to the system allows to observe the effect of crack "breathing" and gain insight into the system. It is manifested in the complex dynamic behaviour of the rotor in the region of internal resonance, showing a quasi--periodic motion or even non-periodic behaviour. In the present paper report, we show the system response to the external torque excitation using nonlinear analysis tools such as bifurcation diagram, phase portraits, Poincare maps and wavelet power spectrum. In the region of resonance we study intermittent motions based on laminar phases interrupted by a series nonlinear beats.Comment: 12 pages, 6 figure

Crack Identification by Multifractal Analysis of a Dynamic Rotor Response

Multifractal analysis has been used to diagnose cracked and healthy rotors. Is has been shown that the complexity and regularity criteria of the dynamical systems defined by the multiple scaling of the time series can indicate the damages of the rotating shaft. Relation to the standard power spectrum technique has been also discussed

The role of sentinel node detection techniques in vulvar and cervical cancer

The sentinel node is the first lymph node that receives the lymph drainage from the primary tumour. The pathological status of the sentinel node should reflect the histopathology of the entire regional lymph drainage area — both vulvar and cervical cancer spread through the lymphatic system. In gynaecological oncology recent studies have confirmed the utility of the sentinel node concept in vulvar and cervical cancer. Three techniques for sentinel node localisation are available. The preoperative lymphoscintigraphy and intraoperative handheld gamma probe detection require the administration of the technetium-99m-labelled colloid around the tumour. The other method is based on the injection of the patent blue dye — during the surgery of the sentinel node because of the dye uptake becomes visible. Following detection, the sentinel lymph node can be removed separately and assessed with ultrastaging and immunohistochemical staining. In the early stages of vulvar and cervical cancer the lymph nodes metastases rate is relatively low — in most cases lymphadenectomy is not necessary. The determination of the regional lymph nodes’ pathological status may limit the extent of the surgical treatment. The sentinel node detection rate is relatively high and depends on the applied technique. This technique may play an important role in the treatment of vulvar and cervical cancer. This paper describes the details of sentinel node identification and reviews the literature

Evaluation of sentinel node detection in vulvar cancer

BACKGROUND: In vulvar cancer, in a large portion of patients with early stages of the disease, the inguinal lymphadenectomy not only does not influence the overall survival and recurrence rate but may increase the incidence of complications. Sentinel lymph node (SN) detection is a promising technique for detecting groin lymph nodes, which may in future lead to less extensive use of surgical treatment. The aim of the study was to evaluate the feasibility of the sentinel node detection technique in patients with vulvar cancer. MATERIAL AND METHODS: Between the years 2003 and 2005, we performed intraoperative lymphatic mapping on 10 patients with planoepithelial vulvar cancer. In eight cases, vulvar lesion was localized centrally, around the clitoris. The extent of the surgery included radical vulvectomy with bilateral inguinal lymphadenectomy in nine cases and unilateral inguinal lymphadenectomy in one case. For the lymphatic mapping, we employed two detection methods: 99mTc-labelled radiocolloid (activity 35-70 MBq) and blue dye (3-5 ml). Both techniques were used in six cases (60%), blue dye only in three cases and radiocolloid only in one case. RESULTS: In each patient, we detected at least one sentinel lymph node. Sentinel nodes were localized in 14 of 19 operated groins (73.7%); a total of 25 SNs in all. The mean number of SNs for one groin was 1.78. Nodal metastases were found in four cases. In three cases, metastases were detected only in the SN. In one patient, two SNs with metastases were found in one groin and in the contralateral groin (without any SN) there was one unchanged node, which transpired to be metastatic. This can be explained by a complete overgrowth of neoplasm in the lymph node resulting in lymph flow stasis and disabling tracer uptake. In five cases, an SN was found only in one groin ó the first case is described above, in the second case the vulvar tumor was localized laterally, opposite to the groin without any SN. In the remaining three cases, we have used only one method of SN detection. CONCLUSIONS: Lymphatic mapping in vulvar cancer based on the combined detection technique is a highly accurate method after adequate training of the surgeons

The influence of depth of marker administration on sentinel node detection in cervical cancer

BACKGROUND: Regional lymph node surgical management is an integral part of cervical cancer therapy. In gynaecological oncology, recent studies have confirmed the utility of the sentinel node concept in vulvar and cervical cancer. The method of the marker’s administration is considered to play an important role in sentinel node detection. MATERIAL AND METHODS: 60 patients with cervical cancer (stage IB–IIA) underwent SLN detection during radical abdominal hysterectomy. The patients were randomly divided into two groups: the first group of 30 patients with 0.5–1cm deep marker injection, the second with sub-epithelial marker injection. Gamma-camera scanning, as well as hand-held probe detection was applied. RESULTS: All hot nodes visualised on lymphoscintigraphy were “hot” when using the hand-held gamma probe. Deep marker injection revealed a sentinel node in 27 patients (90%) on both sides, in 3 patients (10%) only on one side. Only 40 (67%) sentinel nodes were blue-stained. Sub-epithelial marker administration revealed a sentinel node on both sides in all 30 patients (100%). In 28 patients (93.3%) the sentinel nodes were radioactive and blue-stained, in one case not-blue stained on either side, in one case blue stained only on one side. CONCLUSIONS: The sentinel node detection rate in cervical cancer is relatively high and depends on the applied technique. The superficial administration of radiocolloid and the blue dye into the cervix provides a higher sentinel node detection rate than deep administration in cervical cancer patients

Multiresolution Wavelet Analysis of the Dynamics of a Cracked Rotor

We examine the dynamics of a healthy rotor and a rotor with a transverse crack, which opens and closes due to its self weight. Using discrete wavelet transform, we perform a multiresolution analysis of the measured vibration signal from each of these rotors. In particular, the measured vibration signal is decomposed into eight frequency bands, and the rms amplitude values of the healthy and cracked rotors are compared in the three lowest-frequency bands. The results indicate that the rms vibration amplitudes for the cracked rotor are larger than those of the healthy rotor in each of these three frequency bands. In the case of externally applied harmonic force excitation to the rotor, the rms values of the vibration amplitude of the cracked rotor are also found to be larger than those of a healthy rotor in the three lowest-frequency bands. Furthermore, the difference in the rms values between the healthy and cracked rotors in each of the three lowest-frequency bands is more pronounced in the presence of external excitation than that with no excitation. The obtained results suggest that the present multiresolution approach can be used effectively to detect the presence of a crack in a rotor

Investigation of an Advanced Cellulose Profile Used for the Manufacture of Gating Systems

The herein paper contains the results of investigations on a new type of cellulose blend used for the manufacture of profiles applied in the process of making gating systems in the foundry industry. A standard cellulose profile was subjected to an experiment. During the experiment the profile was filled with a liquid cast iron and at the same time the temperatures of the liquid metal crystallizing inside the profile were measured as well as the temperature of the outer layer of the profile was controlled. Further, the microstructure of the cast iron, which crystallized out inside the cellulose profile, was analysed and the cellulose, thermally degraded after the experiment, was verified with the use of the chemical analysis method. Moreover, a quality analysis of the original as well as the degraded cellulose profile was run with the use of the FTIR infrared spectroscopy. The presented results revealed that the cellulose blend is aluminium silicate enriched and contains organic binder additives. The cast iron, which crystallized out, tended to have an equilibrium pearlitic structure with the release of graphite and carbides. The generation of disequilibrium ausferrite phases was also observed in the structure

The importance of preventing infections related to the implantation of a cardiac implantable electronic devices in the population of Bydgoszcz

WOŁOWIEC, Łukasz, SIELSKI, Sławomir, ŻUKOW, Xawery, KONIECZNY, Jakub, SAWICKI, Przemysław, JAŚNIAK, Albert and GRZEŚK, Grzegorz. The importance of preventing infections related to the implantation of a cardiac implantable electronic devices in the population of Bydgoszcz. Journal of Education, Health and Sport. 2023;20(1):169-188. eISSN 2391-8306. DOI http://dx.doi.org/10.12775/JEHS.2023.20.01.016 https://apcz.umk.pl/JEHS/article/view/39458 https://zenodo.org/record/8384733 The journal has had 40 points in Ministry of Education and Science of Poland parametric evaluation. Annex to the announcement of the Minister of Education and Science of 17.07.2023 No. 32318. Has a Journal's Unique Identifier: 201159. Scientific disciplines assigned: Physical Culture Sciences (Field of Medical sciences and health sciences); Health Sciences (Field of Medical Sciences and Health Sciences). Punkty Ministerialne z 2019 - aktualny rok 40 punktów. Załącznik do komunikatu Ministra Edukacji i Nauki z dnia 17.07.2023 Lp. 32318. Posiada Unikatowy Identyfikator Czasopisma: 201159. Przypisane dyscypliny naukowe: Nauki o kulturze fizycznej (Dziedzina nauk medycznych i nauk o zdrowiu); Nauki o zdrowiu (Dziedzina nauk medycznych i nauk o zdrowiu). © The Authors 2023; This article is published with open access at Licensee Open Journal Systems of Nicolaus Copernicus University in Torun, Poland Open Access. This article is distributed under the terms of the Creative Commons Attribution Noncommercial License which permits any noncommercial use, distribution, and reproduction in any medium, provided the original author (s) and source are credited. This is an open access article licensed under the terms of the Creative Commons Attribution Non commercial license Share alike. (http://creativecommons.org/licenses/by-nc-sa/4.0/) which permits unrestricted, non commercial use, distribution and reproduction in any medium, provided the work is properly cited. The authors declare that there is no conflict of interests regarding the publication of this paper. Received: 08.08.2023. Revised: 15.09.2023. Accepted: 26.09.2023. Published: 26.09.2023. The importance of preventing infections related to the implantation of a cardiac implantable electronic devices in the population of Bydgoszcz Łukasz Wołowiec1, Sławomir Sielski1, Xawery Żukow2, Jakub Konieczny1, Przemysław Sawicki1, Albert Jaśniak1, Grzegorz Grześk1 1 Department of Cardiology and Clinical Pharmacology, Faculty of Health Sciences, Collegium Medicum in Bydgoszcz, Nicolaus Copernicus University, 87-100 Toruń, Poland 2 Medical University of Bialystok, Bialystok, Poland Corresponding author*: Łukasz Wołowiec, [email protected] Abstract: Cardiac implantable electronic device (CIED) infection, despite significant developments in medicine, is still a significant source of morbidity and mortality, occurring in the range of 1% to 4% of all implantation cases. A modern approach to reducing the risk of CIED infection is the use of an absorbable antibacterial coating, also known as an envelope in which the device is placed. The material from which the envelope is made is completely absorbed by the body approximately nine weeks after implantation, simultaneously releasing antibiotics. The presented manuscript discusses the importance of preventing infections related to CIEDs implantation and presents partial data on implanted CIEDs in the population of Bydgoszcz. Research into infections associated with CIED implantation is highly important as it can significantly reduce the risk of complications and improve treatment outcomes. Continued research in this field is essential to refine prevention strategies and enhance the quality of care for CIED patients. The presented data on implanted CIEDs in the population of Bydgoszcz represent a crucial step in understanding the prevalence of these devices and may provide valuable insights for further research into preventing CIED-related infections. Further analysis of this data can help develop more effective prevention strategies and improve healthcare in this area. Key words: implantation, cardiac implantable electronic devices, Bydgoszc