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On the Unipolar Generator: An Experimental and Theoretical Study

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Journal of Applied Mathematics and Physics 2024年第8期12卷 2928-2958页

作者： konstantinos Patrinos Physics Department National Technical University of Athens Athens Greece

When studying the phenomenon of the induced electromotive force, which originates from Faraday’s unipolar inductor, the contrast between Faraday’s view of the magnetic field dynamic lines and the theory of relativity is revealed. In order to remove this contradiction, this phenomenon was studied in depth, theoretically and experimentally, using an experimental setup similar to Faraday’s. Calculations of the induced electromotive force, based on relativity on the one hand and on Faraday’s view on the other were made with the help of measurements of the magnetic field components. Accurate magnetic field measurements are confirmed by analytical calculations. Precise-induced electromotive force measurements confirmed Faraday’s view and contradicted the theory of relativity.

关键词： Faraday’s Experiment Unipolar Generator Homopolar Generator Faraday’s Inductor Unipolar Induction

The Effect of Preloading on the Cyclic Liquefaction Strength Measured in the Laboratory

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Journal of Civil Engineering and Architecture 2024年第6期18卷 269-275页

作者： konstantinos Stamatopoulos Stamatopoulos and Associates 5 Isavron StreetAthens 11471Greece

The effect of preloading on the liquefaction cyclic strength was investigated by cyclic shear tests where horizontal shear stress oscillated about a zero mean value on sands with varying fines content and at varying prestress ratios, densities and verticalstresses. Test results showed a marked increase of the cyclic soil strength with the prestress ratio. The effect is more pronounced for the looser specimens. An empirical expression predicting this effect is proposed. This expression is validated from results of a field test.

关键词： Cyclic liquefaction shear stress field test

Intentionally unilateral prostatic artery embolization:Patient selection,technique and potential benefits

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World Journal of Radiology 2024年第9期16卷 380-388页

作者： Hippocrates Moschouris konstantinos Stamatiou Department of Radiology General Hospital“Tzanio”Piraeus 18536Greece Department of Urology General Hospital“Tzanio”Piraeus 18536Greece

BACKGROUND Prostatic artery embolization(PAE)is a promising but also technically demanding interventional radiologic treatment for symptomatic benign prostatic *** technical challenges in PAE are associated with the complex anatomy of prostatic arteries(PAs)and with the systematic attempts to catheterize the PAs of both pelvic *** procedure times and high radiation doses are often the result of these attempts and are considered significant disadvantages of *** authors hypothesized that,in selected patients,these disadvantages could be mitigated by intentionally embolizing PAs of only one pelvic *** To describe the authors’approach for intentionally unilateral PAE(IU-PAE)and its potential *** This was a single-center retrospective study of patients treated with IU-PAE during a period of 2 ***-PAE was applied in patients with opacification of more than half of the contralateral prostatic lobe after angiography of the ipsilateral PA(subgroup A),or with markedly asymmetric prostatic enlargement,with the dominant prostatic lobe occupying at least two thirds of the entire gland(subgroup B).All patients treated with IU-PAE also fulfilled at least one of the following criteria:Severe tortuosity or severe atheromatosis of the pelvic arteries,non-visualization,or visualization of a tiny(<1 mm)contralateral PA on preprocedural computed tomographic *** contrast-enhanced ultrasonography(iCEUS)was applied to monitor prostatic ***-PAE patients were compared to a control group treated with bilateral *** IU-PAE was performed in a total 13 patients(subgroup A,n=7;subgroup B,n=6).Dose-area product,fluoroscopy time and operation time in the IU-PAE group(9767.8μGy∙m^(2),30.3 minutes,64.0 minutes,respectively)were significantly shorter(45.4%,35.9%,45.8%respectively,P<0.01)compared to the control *** and imaging outcomes did not differ significantly between the IU-PAE group and the control

关键词： Prostatic artery embolization Unilateral Computed tomographic angiography Dose area product Fluoroscopy time Prostatic infarction

New markers of fibrosis in hepatitis C:A step towards the Holy Grail?

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World Journal of Hepatology 2024年第2期16卷 112-114页

作者： konstantinos John Dabos Department of Hepatology St Hohn's HospitalLivingston EH546PPWest LothianUnited Kingdom

In the present issue of the World Journal of Hepatology,Ferrassi et al examine the problem of liver fibrosis staging in chronic hepatitis *** identify novel biomarkers in an effort to predict accurate fibrosis staging with the aid of the metabolome of Hepatitis C *** I think Ferrassi et al took a different approach in identifying fibrosis biomarkers,by looking at the patients’*** biomarkers clearly separate patients from *** can also separate out,patients with minimal fibrosis(F0-F1 stage)and patients with cirrhosis(F4 stage).Obviously,if these biomarkers were to be widely used,tests for all the important metabolites would need to be readily available for use in hospitals or outpatient setting and that may prove difficult and above all,***,this step could eventually lead to a metabolomic approach for novel biomarkers of ***,it would need to be validated,but could represent a step towards the Holy Grail of Hepatology.

关键词： Hepatitis C metabolomics Fibrosis Non invasive markers Metavir

Prognostic nutritional index in predicting survival of patients with gastric or gastroesophageal junction adenocarcinoma: A systematic review

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World Journal of Gastrointestinal Oncology 2024年第2期16卷 514-526页

作者： Stylianos Fiflis Grigorios Christodoulidis Menelaos Papakonstantinou Alexandros Giakoustidis Stergos Koukias Paraskevi Roussos Marina Nektaria Kouliou konstantinos Eleftherios Koumarelas Dimitrios Giakoustidis First Department of Surgery General Hospital PapageorgiouThessaloniki 56429Greece Department of General Surgery University Hospital of LarissaLarissa 41110Greece

BACKGROUND Gastric cancer is the third most common cause of cancer related death *** with or without chemotherapy is the most common approach with curative intent;however,the prognosis is poor as mortality rates remain *** indexes have been proposed in the past few years in order to estimate the survival of patients undergoing *** preoperative nutritional status of gastric cancer patients has recently gained attention as a factor that could affect the postoperative course and various indexes have been *** aim of this systematic review was to assess the role of the prognostic nutritional index(PNI)in predicting the survival of patients with gastric or gastroesophageal adenocarcinoma who underwent gastrectomy with curative *** To investigate the role of PNI in predicting the survival of patients with gastric or gastroesophageal junction *** A thorough literature search of PubMed and the Cochrane library was performed for studies comparing the overall survival(OS)of patients with gastric or gastroesophageal cancer after surgical resection depending on the preoperative PNI *** PRISMA algorithm was used in the screening process and finally 16 studies were included in this systematic *** review protocol was registered in the International Prospective Register of Systematic Reviews(PRO) RESULTS Sixteen studies involving 14551 patients with gastric or esophagogastric junction adenocarcinoma undergoing open or laparoscopic or robotic gastrectomy with or without adjuvant chemotherapy were included in this systematic *** patients were divided into high-and low-PNI groups according to cut-off values that were set according to previous reports or by using receiver operating characteristic curve analysis in each individual *** 5-year OS of patients in the low-PNI groups ranged between 39%and 70.6%,while in the high-PNI groups,it ranged between 54.9%and 95.8%.In most of the included st

关键词： Prognostic nutritional index Gastric adenocarcinoma Gastroesophageal junction cancer Prognosis Overall survival

Grafts in Peyronie’s surgery without the use of prostheses:a systematic review and meta-analysis

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Asian Journal of Andrology 2024年第3期26卷 250-259页

作者： Anastasios Natsos Vasileios Tatanis Stavros Kontogiannis Sharon Waisbrod Kristiana Gkeka Mohamed Obaidad Angelis Peteinaris konstantinos Pagonis Costas Papadopoulos Panagiotis Kallidonis Evangelos Liatsikos Petros Drettas Department of Urology University of PatrasPatras 26500Greece Uroclinic Pfaeffikon 8808Switzerland Department of Medical Physics University of PatrasPatras26500Greece Department of Urology Medical University of ViennaVienna 1090Austria

Peyronie’s disease(PD)is characterized by abnormal penile curvature,and various surgical methods have been developed usingdifferent graft ***,there is currently no universal agreement on which type of graft is the *** objective of thisreview was to evaluate the available literature and identify the most effective graft material for penile curvature correction in PD.A literature search was conducted using electronic databases,including PubMed,Scopus,and the Cochrane *** patients,intervention,comparison,and outcome(PICO)approach was used to define the eligibility of *** authors independentlyselected studies,evaluated them,and extracted ***-effect models using the DerSimonian–Laird method were *** were single-arm studies and had a high risk of *** mucosa grafts(BMG)were found to result in the highest penilestraightening rates and were associated with the least de novo erectile *** grafts demonstrated a high successrate in straightening despite a higher mean preoperative curvature,while Tutoplast grafts had a higher incidence of postoperativeerectile *** had the highest percentage of postoperative penile ***,the TachoSil graft showed thebest performance when preoperative curvature is taken into *** on the available literature,BMG appear to be the mosteffective for penile curvature correction in PD,but this is offset by the requirement for low preoperative *** TachoSilgraft shows the best overall performance when preoperative curvature is *** randomized clinical trials arestill needed to determine graft superiority.

关键词： erectile function penile curvature penile grafts Peyronie’s disease

Percutaneous antegrade management of large proximal ureteral stones using non-papillary puncture

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Asian Journal of Urology 2024年第1期11卷 110-114页

作者： Arman Tsaturyan Angelis Peteinaris Constantinos Adamou konstantinos Pagonis Lusine Musheghyan Anastasios Natsos Theofanis Vrettos Evangelos Liatsikos Panagiotis Kallidonisa Department of Urology University of PatrasPatrasGreece Gerald and Patricia Turpanjian School of Public Health American University of ArmeniaYerevanArmenia Department of Anesthesiology and ICU University of PatrasPatrasGreece Department of Urology Medical University of ViennaViennaAustria

Objective:To evaluate the feasibility and the safety of medial non-papillary percutaneous nephrolithotomy(npPCNL)for the management of large proximal ureteral ***:We evaluated prospectively collected data of 37 patients with large proximal ureteral stones more than 1.5 cm in diameter treated by prone *** on stone size,in-toto stone removal or lithotripsy using the Lithoclast®Trilogy(EMS Medical,Nyon,Switzerland)was *** parameters including operative time(from start of puncture to the skin suturing),stone extraction time(from the first insertion of the nephroscope to the extraction of all stone fragments),and the stone-free rate were ***:Twenty-one males and 16 females underwent npPCNL for the management of large upper ureteral *** median age and stone size of treated patients were 58(interquartile range[IQR]:51-69)years and 19.3(IQR:18.0-22.0)mm,*** median operative time and stone extraction time were 25(IQR:21-29)min and 8(IQR:7-10)min,*** case(2.7%)of postoperative bleeding and two cases(5.4%)of prolonged fever were managed *** stone-free rate at a 1-month follow-up was 94.6%.Conclusion:The npPCNL provides a straight route to the ureteropelvic junction and proximal *** from a dilated portion of the ureter under low irrigation pressure with larger diameter instruments results in effective and safe stone extraction within a few minutes.

关键词： Antegrade percutaneous nephrolithotomy Proximal ureteral stone Non-papillary puncture Large ureteral stone Prone percutaneous nephrolithotomy

Complications of modern pancreaticoduodenectomy:A systematic review and meta-analysis

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Hepatobiliary & Pancreatic Diseases International 2022年第6期21卷 527-537页

作者： Stamatios Kokkinakis Evangelos I Kritsotakis Neofytos Maliotis Ioannis Karageorgiou Emmanuel chrysos konstantinos Lasithiotakis Department of General Surgery University General Hospital of HeraklionHeraklionCrete 71110Greece Laboratory of Biostatistics Division of Social MedicineSchool of MedicineUniversity of CreteHeraklionCrete 71110Greece

Background:In the past decades,the perioperative management of patients undergoing pancreaticoduo-denectomy(PD)has undergone major changes *** review aimed to systematically determine the burden of complications of PD performed in the last 10 *** sources:A systematic review was conducted in PubMed for randomized controlled trials and ob-servational studies reporting postoperative complications in at least 100 PDs from January 2010 to April *** of bias was assessed using the Cochrane RoB2 tool for randomized studies and the method-ological index for non-randomized studies(MINORS).Pooled complication rates were estimated using random-effects *** was investigated by subgroup analysis and ***:A total of 20 randomized and 49 observational studies reporting 63229 PDs were *** MINORS score showed a high risk of bias in non-randomized studies,while one quarter of the ran-domized studies were assessed to have high risk of *** incidences of 30-day mortality,overall complications and serious complications were 1.7%(95%CI:0.9%-2.9%;I 2=95.4%),54.7%(95%CI:46.4%-62.8%;I 2=99.4%)and 25.5%(95%CI:21.8%-29.4%;I 2=92.9%),***-relevant postopera-tive pancreatic fistula risk was 14.3%(95%CI:12.4%-16.3%;I 2=92.0%)and mean length of stay was 14.8 days(95%CI:13.6-16.1;I 2=99.3%).Meta-regression partially attributed the observed heterogeneity to the country of origin of the study,the study design and the American Society of Anesthesiologists ***:Pooled complication rates estimated in this study may be used to counsel patients scheduled to undergo a PD and to set benchmarks against which centers can audit their ***,cautious interpretation is necessary due to substantial heterogeneity.

关键词： Pancreaticoduodenectomy Postoperative complications Meta-analysis Postoperative pancreatic fistula

Recognizing and preventing complications regarding bioresorbable scaffolds during coronary interventions

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World Journal of Cardiology 2024年第9期16卷 508-511页

作者： George Latsios Leonidas Koliastasis konstantinos Toutouzas Kostas Tsioufis Department of Cardiology Hippokration General HospitalAthens Medical SchoolNational and Kapodistrian University of AthensAthens 11527Greece

The evolution of coronary intervention techniques and equipment has led to more sophisticated procedures for the treatment of highly complex ***,as a result,the risk of complications has increased,which are mostly iatrogenic and often include equipment *** dislodgement warrants vigilance for the early diagnosis and a stepwise management approach is required to either expand or retrieve the lost *** the era of bioresorbable scaffolds that are not radiopaque,increased caution is *** imaging may assist in detecting the lost scaffold in cases of no visibility *** lesion preparation is the key to minimizing the possibility of equipment loss;however,in the case that it occurs,commercially available and improvised devices and techniques may be applied.

关键词： Bioresorbable scaffolds Stent dislodgement Complication prevention Coronary complications Equipment failure