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Application of signal processing techniques to the detection of tip vortex cavitation noise in marine propeller

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Journal of Hydrodynamics 2013年第3期25卷 440-449页

作者： LEE Jeung-Hoon HAN Jae-Moon PARK Hyung-gil SEO Jong-Soo Samsung Ship Model Basin (SSMB) Marine Research Institute Samsung Heavy Industries Science TownDaejeon 305-380 Korea

The tip vortex cavitation and its relevant noise has been the subject of extensive researches up to now. In most cases of experimental approaches, the accurate and objective decision of cavitation inception is primary, which is the main topic of this paper. Although the conventional power spectrum is normally adopted as a signal processing tool for the analysis of cavitation noise, a faithful exploration cannot be made especially for the cavitation inception. Alternatively, the periodic occurrence of bursting noise induced from tip vortex cavitation gives a diagnostic proof that the repeating frequency of the bursting contents can be exploited as an indication of the inception. This study, hence, employed the Short-Time Fourier Transform （STFT） analysis and the Detection of Envelope Modulation On Noise （DEMON） specmma analysis, both which are appropriate for finding such a repeating frequency. Through the acoustical measurement in a water tunnel, the two signal processing techniques show a satisfactory result in detecting the inception of tip vortex cavitation.

关键词： tip vortex cavitation inception Short-Time Fourier Transform (STFT) Detection of Envelope Modulation On Noise(DEMON)

Hormonal control of seasonal color change in female spiny-footed lizards:an observational and experimental approach

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Current Zoology 2019年第6期65卷 633-642页

作者： Belen FRESNILLO Josabel BELLIURE Diego gil Jose J.CUERVO Department of Life Sciences Ecology SectionUniversity of AlcalaMadridSpain Department of Functional and Evolutionary Ecology Estacion Experimental de Zonas Aridas(CSIC)Carretera de Sacramento s/nAlmerfaSpain Department of Evolutionary Ecology Museo Nacional de Ciencias Naturales(CSIC)MadridSpain

Breeding coloration of females often signals aspects of their reproductive status,suggesting a link between color and sex steroid *** this study,we examined the relationships between 2 sex steroid hormones(progesterone and p-estradiol)and reproductive coloration in female spinyfooted lizards Acanthodactylus *** first explored natural variation in female plasma hormone levels and coloration during their reproductive cycle,p-estradiol was negatively related to brightness and positively related to red saturation,whereas progesterone was not significantly related to *** identifying key relationships,plasma hormone concentrations were manipulated by creating 3 experimental female groups(p-estradiol-treated,progesterone-treated,and control),and the effects on coloration were monitored,p-estradiol-treated females,in which there was a rise in both p-estradiol and progesterone levels,lost their red coloration earlier than females in the other 2 experimental groups,whereas progesterone treatment had no significant effect on female *** results suggest that high levels of either p-estradiol alone or(3-estradiol together with progesterone trigger the loss of red coloration in female spiny-footed lizards,and that progesterone alone does not affect *** hypothesize that changes in female breeding color might be regulated by(3-estradiol in species in which conspicuous coloration is displayed before ovulation,and by progesterone in species in which this color is displayed during gravidity.

关键词： color signaling enzyme immunoassay hormone-induced color change sex-specific coloration spectrophotometry transdermal hormone application

Effect of hepatic iron concentration reduction on hepatic fibrosis and damage in rats with cholestatic liver disease

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World Journal of Gastroenterology 2006年第2期12卷 240-245页

作者： gil Peretz Gabriela Link Orit Pappo Rafael Bruck Zvi Ackerman Department of Internal Medicine Hebrew University- Hadassah Medical CenterMount Scopus CampusJerusalemIsrael Department of Human Nutrition and Metabolism Hebrew University Hadassah Medical SchoolJerusalemIsrael Department of Pathology Hebrew University-Hadassah Medical CenterJerusalemIsrael Department of Gastroenterology and Hepatology The EWolfson Medical CenterHolonand Sackler School of MedicineTel Aviv UniversityTel AvivIsrael

AIM： TO assess the effect of iron reduction after phlebotomy in rats with ＂normal＂ hepatic iron concentration （HIC） on the progression of hepatic fibrosis, as a result of bile duct ligation （BDL）. METHODS： Rats underwent phlebotomy before or after sham operation or BDL. Animals undergone only BDL or sham operation served as controls. Two weeks after surgery, indices of hepatic damage and fibrosis were evaluated. RESULTS： Phlebotomy lowered HIC. Phlebotomy after BDL was associated with body weight increase, lower hepatic weight, less portal hypertension, less periportal necrosis, less portal inflammation, lower hepatic activity index score and higher albumin levels. On the other hand, phlebotomy before BDL was associated with body weight decrease and hepatic activity index score increase. Phlebotomy after sham operation was not associated with any hepatic or systemic adverse effects. CONCLUSION： Reduction of HIC after induction of liver damage may have beneficial effects in BDL rats. However, iron deficiency could induce impairment of liver function and may make the liver more susceptible to insults like BDL.

关键词： Iron Phlebotomy Bile duct ligation Hepatic activity index Rat.

Malignant colorectal polyps

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World Journal of Gastroenterology 2010年第25期16卷 3103-3111页

作者： Luis Bujanda Angel Cosme Ines gil Juan I Arenas-Mirave Department of Gastroenterology Donostia Hospital Uni-versity of Basque Country Centro de Investigación Biomédica en Enfermedades Hepáticas y Digestivas 20010 San Sebastián Guipúzcoa Spain University of Basque Country Centro de Investigación Biomédica en Enfermedades Hepáticas y Digestivas 20010 San Sebastián Guipúzcoa Spain

Nowadays, the number of cases in which malignant colorectal polyps are removed is increasing due to colorectal cancer screening programmes. Cancerous polyps are classified into non-invasive high grade neoplasia (NHGN), when the cancer has not reached the muscularis mucosa, and malignant polyps, classed as T1, when they have invaded the submucosa. NHGN is considered cured with polypectomy, while the prognosis for malignant polyps depends on various morphological and histological factors. The prognostic factors include, sessile or pedunculated morphology of the polyp, whether partial or en bloc resection is carried out, the degree of differentiation of the carcinoma, vascular or lymphatic involvement, and whether the polypectomy resection margin is tumor free. A malignant polyp at T1 is considered cured with polypectomy ifit is a pedunculated polyp (Ip of the Paris classification), it has been completely resected, it is not poorly differentiated, the resection edge is not affected by the tumor and there is no vascular or lymphatic involvement. The sessile malignant polyp (Is of the Paris classification) at T1 is considered not cured with polypectomy. Only in some cases (e.g. older people with high surgical risk) local excision(polypectomy or endoscopic submucosal dissection or conventional endoscopic mucosal resection) is considered the definitive treatment.

关键词： Favourable histology Follow-up Malignant polyps Non-invasive high grade neoplasia Treatment

Physicochemical characterization, the Hirshfeld surface, and biological evaluation of two meloxicam compounding pharmacy samples

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Journal of Pharmaceutical Analysis 2018年第2期8卷 103-108页

作者： Luciana F.A.Romani maria I.Yoshida Elionai C.L.Gomes Renes R.Machado Felipe F.Rodrigues Marcio M.Coelho Marcelo A.Oliveira maria B.Freitas-Marques Rosane A.S.San gil Wagner N.Mussel Department of Chemistry Institute of Exact Sciences Federal University of Minas Gerais Department of Pharmaceutical Products Faculty of Pharmacy Federal University of Minas Gerais Health Science Department Federal University of Espírito Santo Campus Sao Mateus Institute of Chemistry Federal University of Rio de Janeiro Campus Fundao

Meloxicam(MLX) is an anti-inflammatory drug susceptible to variations and crystalline transitions. In compounding pharmacies, the complete crystallographic evaluation of the raw material is not a routine procedure. We performed a complete crystallographic characterization of aleatory raw MLX samples from compounding pharmacies. X-ray diffraction indicated the presence of two crystalline forms in one sample. DSC experiments suggested that crystallization, or a crystal transition, occurred differently between samples. The FTIR and ~1H NMR spectra showed characteristic assignments.^(13)C solid-state NMR spectroscopy indicated the presence of more than one phase in a sample from pharmacy B. The Hirshfeld surface analysis, with electrostatic potential projection, allowed complete assignment of the UV spectra in ethanol solution. The polymorph I of meloxicam was more active than polymorph III in an experimental model of acute inflammation in mice. Our results highlighted the need for complete crystallographic characterization and the separation of freely used raw materials in compounding pharmacies,as a routine procedure, to ensure the desired dose/effect.

关键词： Meloxicam Polymorphism Hirshfeld surface Anti-inflammatory activity

Effects of homogenization temperature on microstructure and mechanical properties of high-speed-extruded Mg–5Bi–3Al alloy

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Journal of Magnesium and Alloys 2022年第10期10卷 2833-2846页

作者： Jae Won Cha Sang-Cheol Jin Jae-gil Jung Sung Hyuk Park School of Materials Science and Engineering Kyungpook National University80 DaehakroDaegu 41566Republic of Korea Advanced Metals Division Korea Institute of Materials ScienceChangwon 51508Republic of Korea

This study investigates the effects of billet homogenization temperature on the dynamic recrystallization behavior during high-speed extrusion and resultant microstructure and tensile properties of the Mg–5Bi–3Al(BA53,wt%)*** billets homogenized at 350 and450℃(350H and 450H billets)are extruded at a high speed of 69 m/*** 350H billet has a relatively smaller grain size and a higher abundance of fine Mg3Bi2particles compared to the 450H *** extrusion of the 350H billet,enhanced dynamic recrystallization occurs as a result of its finer grains and abundance of particles,while the growth of recrystallized grains is suppressed by the grain-boundary pinning effect of ***,the extruded 350H material is characterized by smaller grains,relatively greater number of Mg3Bi2particles,and a higher internal strain energy than the extruded 450H *** tensile strength of the extruded 350H material is higher than that of the extruded 450H material owing to stronger grain-boundary hardening,particle hardening,and strain hardening *** extruded 350H material also exhibits a higher tensile elongation as its smaller grains inhibit the formation of crack-inducing undesirable twins during *** results from this study demonstrate that a decrease in the homogenization temperature from 450 to 350℃leads to improved strength and ductility in the high-speed-extruded BA53 material.

关键词： Mg–Bi–Al alloy High-speed extrusion Homogenization Dynamic recrystallization Tensile properties

KnoE:A Web Mining Tool to Validate Previously Discovered Semantic Correspondences

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Journal of Computer Science & Technology 2012年第6期27卷 1222-1232页

作者： Jorge Martinez-gil José F.Aldana-Montes Department of Computer Languages and Computing Sciences University of MlagaBoulevard Louis Pasteur 35 Mlaga 29071Spain

The problem of matching schemas or ontologies consists of providing corresponding entities in two or more knowledge models that belong to a same domain but have been developed separately. Nowadays there are a lot of techniques and tools for addressing this problem, however, the complex nature of the matching problem make existing solutions for real situations not fully satisfactory. The Google Similarity Distance has appeared recently. Its purpose is to mine knowledge from the Web using the Google search engine in order to semantically compare text expressions. Our work consists of developing a software application for validating results discovered by schema and ontolog2/ matching tools using the philosophy behind this distance. Moreover, we are interested in using not only Google, but other popular search engines with this similarity distance. The results reveal three main facts. Firstly, some web search engines can help us to validate semantic correspondences satisfactorily. Secondly there are significant differences among the web search engines. And thirdly the best results are obtained when using combinations of the web search engines that we have studied.

关键词： database integration data and knowledge engineering similarity distance

An Advanced Probabilistic Neural Network for the Design of Breakwater Armor Blocks

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China Ocean Engineering 2007年第4期21卷 597-610页

作者： Dookie KIM Dong Hyawn KIM Seongkyu CHANG gil Lim YOON Department of Civil and Environmental Engineering Kunsan National UniversityKunsanJeonbukKorea Department of Ocean System Engineering Kunsan National UniversityKunsanJeonbukKorea Coastal Engineering Research Department KORDIAnsanGyeonggiKorea

In this study, an advanced probabilistic neural network （APNN） method is proposed to reflect the global probability density function （PDF） by summing up the heterogeneous local PDF which is automatically determined in the individual standard deviation of variables. The APNN is applied to predict the stability number of armor blocks of breakwaters using the experimental data of＇ van der Meet, and the estimated results of the APNN are compared with those of an empirical formula and a previous artificial neural network （ANN） model. The APNN shows better results in predicting the stability number of armor bilks of breakwater and it provided the promising probabilistic viewpoints by using the individual standard deviation in a variable.

关键词： breakwater armor block stability number multivariate gaussian distribution classigication artificial neural network (ANN) advanced probabilistic neural network (APNN)

Composition ship collision risk based on fuzzy theory

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Journal of Central South University 2014年第11期21卷 4296-4302页

作者： CHEN Shu Rashid Ahmad Byung-gil Lee Do Hyeun Kim Department of Computer Engineering Jeju National University Ara-dongJeju-si Jeju-do 690-756 Korea Electronics & Telecommunication Research Institute GajeongnoYuseong-gu Daejeon 305-700 Korea

Despite of modern navigation devices, there are problems in navigation of vessels in waterways due to the geographical structures, disturbances in water, dynamic nature, and heavily environmental influenced sea traffic. Even though all vessels are equipped with modern navigation devices, the accidents are reported caused by various reasons and mainly by human factor according to investigation. We propose an effective and efficient composition collision risk calculation method for finding the collision probability and avoiding the collision between ships in possible collision situations. The proposed composition collision risk calculation method at ship's position using combination of fuzzy and fuzzy comprehensive evaluation methods. The algorithm is straightforward to implement and is shown to be effective in automatic ship handling for ships involved in complex navigation situations. Experiments are carried out with indigenous data and the results show the effectiveness of the proposed approach.

关键词： automatic ship navigation collision risk fuzzy theory