Ligandless cloud point extraction of trace amounts of palladium and rhodium in road dust samples using Span 80 prior to their determination by flame atomic absorption spectrometry

In this study, a procedure is developed for cloud point extraction of Pd(II) and Rh(III) ions in aqueous solution using Span 80 (non-ionic surfactant) prior to their determination by flame atomic absorption spectroscopy. This method is based on the extraction of Pd(II) and Rh(III) ions at a pH of 10 using Span 80 with no chelating agent. We investigated the effect of various parameters on the recovery of the analyte ions, including pH, equilibration temperature and time, concentration of Span 80, and ionic strength. Under the best experimental conditions, the limits of detection based on 3Sb for Pd(II) and Rh(III) ions were 1.3 and 1.2 ng mL-1, respectively. Seven replicate determinations of a mixture of 0.5 µg mL-1 palladium and rhodium ions gave a mean absorbance of 0.058 and 0.053 with relative standard deviations of 1.8 and 1.6%, respectively. The developed method was successfully applied to the extraction and determination of the palladium and rhodium ions in road dust and standard samples and satisfactory results were obtained.

PREDICTING THE BOILING POINT OF PCDD/Fs BY THE QSPR METHOD BASED ON THE MOLECULAR DISTANCE-EDGE VECTOR INDEX

The quantitative structure property relationship (QSPR) for the boiling point (Tb) of polychlorinated dibenzo-p-dioxins and polychlorinated dibenzofurans (PCDD/Fs) was investigated. The molecular distance-edge vector (MDEV) index was used as the structural descriptor. The quantitative relationship between the MDEV index and Tb was modeled by using multivariate linear regression (MLR) and artificial neural network (ANN), respectively. Leave-one-out cross validation and external validation were carried out to assess the prediction performance of the models developed. For the MLR method, the prediction root mean square relative error (RMSRE) of leave-one-out cross validation and external validation was 1.77 and 1.23, respectively. For the ANN method, the prediction RMSRE of leave-one-out cross validation and external validation was 1.65 and 1.16, respectively. A quantitative relationship between the MDEV index and Tb of PCDD/Fs was demonstrated. Both MLR and ANN are practicable for modeling this relationship. The MLR model and ANN model developed can be used to predict the Tb of PCDD/Fs. Thus, the Tb of each PCDD/F was predicted by the developed models.

Thermal modelling of semiconductor switches in three-level Neutral Point Clamped Medium Voltage DTC-inverter

The aim of this thesis is to investigate the thermal loading of medium voltage three-level NPC inverter’s semiconductor IGCT switches in different operation points. The objective is to reach both a fairly accurate off-line simulation program and also so simple a simulation model that its implementation into an embedded system could be reasonable in practice and a real time use should become feasible. Active loading limitation of the inverter can be realized with a thermal model which is practical in a real time use. Determining of the component heating has been divided into two parts; defining of component losses and establishing the structure of a thermal network. Basics of both parts are clarified. The simulation environment is Matlab-Simulink. Two different models are constructed – a more accurate one and a simplified one. Potential simplifications are clarified with the help of the first one. Simplifications are included in the latter model and the functionalities of both models are compared. When increasing the calculation time step a decreased number of considered components and time constants of the thermal network can be used in the simplified model. Heating of a switching component is dependent on its topological position and inverter’s operation point. The output frequency of the converter defines mainly which one of the switching components is – because of its losses and heating – the performance limiting component of the converter. Comparison of results given by different thermal models demonstrates that with larger time steps, describing of fast occurring switching losses becomes difficult. Generally articles and papers dealing with this subject are written for two-level inverters. Also inverters which apply direct torque control (DTC) are investigated rarely from the heating point of view. Hence, this thesis completes the former material.

Nuorisorikollisuuden esiintyvyys, taustatekijät ja sovittelu

Tausta Vaikka nuorisorikollisuus on kriminologisen tutkimuksen perinteinen kohde, on edelleen tarvetta pitkittäistutkimuksille, joissa on laaja, koko väestöä edustava otos. Kriminaalipolitiikan alalla puolestaan rikosten sovittelu ja muut restoratiivisen oikeuden muodot ovat nousseet Suomessakin haastamaan perinteiset rikoskontrollin paradigmat, rangaistuksen ja hoidon. Tutkimuskysymykset Tutkimuksen pääkysymyksenä oli, mitkä lapsuudessa (8 v.) ja nuoruudessa (18 v.) mitatut psykososiaaliset tekijät ovat yhteydessä nuorisorikollisuuden (16-20 v.) määrään ja lajiin. Lisäksi yhtenä kysymyksenä oli, miten varusmiespalvelun aikaiset psykiatriset diagnoosit liittyvät nuorisorikollisuuteen. Lisäksi tutkimme nuorisorikollisuuden esiintyvyyttä ja palvelujen käyttöä, ja vertailimme eri informanttien (tutkimushenkilöt itse, vanhemmat ja opettajat) vastausten ennusvoimaa lasten tulevan rikollisuuden suhteen. Rikosten sovittelun osalta kysymyksenä oli, miten suomalainen sovittelukäytäntö vastaa restoratiivisen oikeuden teoriaa ja miten sovittelua pitäisi kehittää. Aineisto ja metodit Pitkittäistutkimuksemme aineistona oli valtakunnallisesti edustava satunnaisotos, joka vastasi 10% vuonna 1981 Suomessa syntyneistä suomenkielisistä pojista. Ensimmäinen tiedonkeruu tapahtui 1989, kun pojat olivat 8-vuotiaita. Tietoa kerättiin lomakekyselyin pojilta itseltään sekä heidän vanhemmiltaan ja opettajiltaan. Tietoja saatiin 2946 pojasta. Lasten lomakkeena oli Children’s Depression Inventory, vanhemman lomakkeena Rutter A2 ja opettajan lomakkeena Rutter B2. Toinen tiedonkeruu järjestettiin, kun pojat osallistuivat kutsuntoihin 1999. Tietoja saatiin 2330 pojasta. Lomakkeena oli Young Adult Self-Report . Puolustusvoimien rekisteristä saatiin tiedot poikien kutsunnoissa ja palvelusaikana (vuosina 1999-04) saamista psykiatrisista diagnooseista, jotka luokiteltiin kuuteen luokkaan: antisosiaalinen persoonallisuushäiriö, päihdehäiriöt, psykoottiset häiriöt, ahdistuneisuushäiriöt, masennustilat ja sopeutumishäiriöt. Tieto mahdollisesta diagnoosista saatiin 2712 pojasta. Rikollisuus operationalisoitiin poliisin ns. RIKI-rekisteriin vuosina 1998-2001 rekisteröityjen tekojen avulla, kun pojat olivat pääasiassa 16-20-vuotiaita. Rikosten määrän mukaan pojat jaettiin neljään ryhmään: ei rikoksia, 1-2 rikosta (satunnainen rikollisuus), 3-5 rikosta (uusintarikollisuus) ja yli 5 rikosta (aktiivinen uusintarikollisuus). Rikoslajeista muodostettiin viisi kategoriaa: huume-, väkivalta-, omaisuus-, liikenne- ja rattijuopumusrikollisuus. Analyysivaiheessa rekisteridatasta poistettiin liikennerikkomukset. Kaikkiaan tiedot mahdollisista poliisikontakteista saatiin 2866 pojasta. Sovitteludata koostui 16 sovittelujutun havainnoinnista Turussa vuosina 2001- 2003. Tulokset Kaikkiaan 23% pojista oli rekisteröity rikoksesta (poissulkien liikennerikkomukset) nelivuotisen tutkimusperiodin aikana 16-20-vuotiaana. Satunnaisia rikoksentekijöitä oli 15%, uusijoita 4% ja moninkertaisia uusijoita 4%. Rikokset kasautuivat moninkertaisille uusijoille: tämä 4%:n ryhmä teki 72% kaikista rikoksista . Omaisuus- ja liikennerikollisia oli eniten (kumpiakin 11%), ja huumerikollisia vähiten (4%). Kaikki rikoslajit korreloivat keskenään tilastollisesti merkitsevästi. Nuorisorikollisuuden itsenäisiä ennustekijöitä lapsuudessa olivat rikkinäinen perherakenne, vanhempien alhainen koulutustaso, lapsen käytösongelmat ja hyperaktiivisuus. Kun verrattiin eri informantteja (lapset itse ja heidän vanhempansa ja opettajansa), etenkin opettajien vastaukset ennustivat lasten tulevaa rikollisuutta. Nuoruudessa rikollisuuden itsenäisiä korrelaatteja olivat pienellä paikkakunnalla asuminen, vanhempien ero, seurustelu, itse ilmoitettu antisosiaalisuus ja säännöllinen tupakointi ja humalajuominen. Ennus- ja taustatekijöille oli tyypillistä se, että ne olivat lineaarisessa yhteydessä rikosten määrään (ongelmat ja rikosten määrä lisääntyivät käsi kädessä) ja että ne liittyivät useaan rikoslajiin yhtä aikaa. Huumerikollisuudella oli kuitenkin vähemmän itsenäisiä ennus- ja taustatekijöitä kuin muilla rikoslajeilla. Joka kymmenes poika kärsi psykiatrisista häiriöistä. Tämä ryhmä teki noin puolet kaikista rikoksista, ja lähes joka toinen poika, jolla oli psykiatrinen häiriö, oli rekisteröity rikoksista. Rikolliseen käytökseen liittyivät etenkin antisosiaalinen persoonallisuushäiriö ja päihdehäiriöt. Masennustilat olivat kuitenkin ainoa diagnoosiryhmä, joka ei ollut yhteydessä rikollisuuteen. Myös psykiatristen häiriöiden esiintyvyys kasvoi lineaarisesti rikosten määrän kanssa; aktiivisista uusintarikollisista yli puolella (59%) oli psykiatrinen diagnoosi. Rikollisuuden lisäksi erilaiset psykososiaaliset ongelmat kasautuivat pienelle vähemmistölle. Aktiivisten uusijoiden ryhmään olivat tilastollisesti merkitsevästi yhteydessä lähes kaikki ongelmat mitä tutkimme. Kuitenkin tästä ryhmästä vain alle 3% oli käyttänyt mielenterveyspalveluja viimeisen vuoden aikana. Rikossovittelun havainnointitutkimuksen perusteella sovittelussa monet perusasiat ovat kunnossa, ja toiminta on mielekästä niin asianosaisten kuin yhteiskunnankin kannalta. Useimmiten osapuolet kohtasivat ja saivat aikaan sopimuksen, johon he vaikuttivat tyytyväisiltä. Rikoksentekijät olivat motivoituneita korvaamaan aiheuttamansa vahingot. Osapuolet saivat kertoa tarinansa omin sanoin, heitä kuunneltiin ja he ymmärsivät mitä sovittelussa puhutaan ja sovitaan. Sovittelun kuluessa jännitys väheni ja asiat saatiin loppuunkäsiteltyä. Asianosaiset saivat vaikuttaa prosessiin ja sopimukseen, ja uhrin oikeudet olivat sovittelussa keskeisellä sijalla. Restoratiivisen teorian perusteella sovittelussa havaittiin myös kehittämisen varaa: Etenkin nuoria rikoksentekijöitä oli hankala saada osallistumaan tosissaan, ja aikuiset helposti hallitsivat keskustelua. Etukäteistapaamisia ja tukihenkilöitä ei juuri hyödynnetty. Sovitteluja hallitsi puhe sopimuksesta ja rahasta. Työkorvauksia ei käytetty eikä rehabilitaatiota käsitelty. Sekä sovitteluun pääsy että sovittelumenettely riippuivat yksittäisistä henkilöistä. Johtopäätökset Rikosten tekeminen nuoruudessa on melko yleistä ja monimuotoista. Rikokset ja psykososiaaliset ongelmat kasautuvat pienelle ryhmälle ja kulkevat käsi kädessä. Myös psykiatriset häiriöt ovat lineaarisessa yhteydessä rikosten määrään. Rikosriskiä voidaan ennustaa jo lapsuudessa, ja etenkin opettajat ovat tarkkanäköisiä lasten ongelmien suhteen. Eri rikoslajeilla on varsin samanlaisia taustatekijöitä. Aktiiviset rikoksentekijät vastaavat suuresta osasta kokonaisrikollisuutta, tarvitsevat eniten apua, mutta eivät kuitenkaan hakeudu psykososiaalisten palvelujen piiriin. Rikosten sovittelu tarjoaa keinon puuttua ongelmiin varhaisessa vaiheessa ilman leimaamista. Sovittelun kehitystehtävät liittyvät etenkin dialogiin, valmisteluihin, tukihenkilöihin, työkorvauksiin, palveluunohjaukseen ja sovittelun sovellusalaan. Sovittelua ja muita restoratiivisia menettelyjä on kehitettävä ja laajennettava esimerkiksi niin, että niitä voitaisiin käyttää palveluunohjauksen välineenä.

Earnings Management Shareholders point of view

This paper studies the relationship of earnings management and investors. Analysis of incentives reveals that most of them are opportunistic in nature. Unfortunately the investor would need insider information to distinguish between different forms of earnings management. Investors in some countries seem to devalue earnings when government body has signaled that earnings management might be involved, unfortunately without a clear signal the behavior seems reverse among non-institutional investors.

Critical-point yield model to estimate yield damage caused by Cercospora zea-maydis in corn

A model to estimate damage caused by gray leaf spot of corn (Cercospora zea-maydis) was developed from experimental field data gathered during the summer seasons of 2000/01 and during the second crop season [January-seedtime] of 2001, in the southwest of Goiás state. Three corn hybrids were grown over two seasons and on two sites, resulting in 12 experimental plots. A disease intensity gradient (lesions per leaf) was generated through application, three times over the season, of five different doses of the fungicide propiconazol. From tasseling onward, disease intensity on the ear leaf (El), and El - 1, El - 2, El + 1, and El + 2, was evaluated weekly. A manual harvest at the physiological ripening stage was followed by grain drying and cleaning. Finally, grain yield in kg.ha-1 was estimated. Regression analysis, performed between grain yield and all combinations of the number of lesions on each leaf type, generated thirty linear equations representing the damage function. To estimate losses caused by different disease intensities at different corn growth stages, these models should first be validated. Damage coefficients may be used in determining the economic damage threshold.

Mobile system for pump working point estimation

In the current economy situation companies try to reduce their expenses. One of the solutions is to improve the energy efficiency of the processes. It is known that the energy consumption of pumping applications range from 20 up to 50% of the energy usage in the certain industrial plants operations. Some studies have shown that 30% to 50% of energy consumed by pump systems could be saved by changing the pump or the flow control method. The aim of this thesis is to create a mobile measurement system that can calculate a working point position of a pump drive. This information can be used to determine the efficiency of the pump drive operation and to develop a solution to bring pump’s efficiency to a maximum possible value. This can allow a great reduction in the pump drive’s life cycle cost. In the first part of the thesis, a brief introduction in the details of pump drive operation is given. Methods that can be used in the project are presented. Later, the review of available platforms for the project implementation is given. In the second part of the thesis, components of the project are presented. Detailed description for each created component is given. Finally, results of laboratory tests are presented. Acquired results are compared and analyzed. In addition, the operation of created system is analyzed and suggestions for the future development are given.

Critical-point model to estimate yield loss caused by Asian soybean rust

ABSTRACTA model to estimate yield loss caused by Asian soybean rust (ASR) (Phakopsora pachyrhizi) was developed by collecting data from field experiments during the growing seasons 2009/10 and 2010/11, in Passo Fundo, RS. The disease intensity gradient, evaluated in the phenological stages R5.3, R5.4 and R5.5 based on leaflet incidence (LI) and number of uredinium and lesions/cm2, was generated by applying azoxystrobin 60 g a.i/ha + cyproconazole 24 g a.i/ha + 0.5% of the adjuvant Nimbus. The first application occurred when LI = 25% and the remaining ones at 10, 15, 20 and 25-day intervals. Harvest occurred at physiological maturity and was followed by grain drying and cleaning. Regression analysis between the grain yield and the disease intensity assessment criteria generated 56 linear equations of the yield loss function. The greatest loss was observed in the earliest growth stage, and yield loss coefficients ranged from 3.41 to 9.02 kg/ha for each 1% LI for leaflet incidence, from 13.34 to 127.4 kg/ha/1 lesion/cm2 for lesion density and from 5.53 to 110.0 kg/ha/1 uredinium/cm2 for uredinium density.

Prevalence of Anxiety and Depression among Medical Students

ABSTRACT Background Medical students are a vulnerable population to develop depression and anxiety disorders. Objective To estimate the prevalence and associated factors of anxiety and depression among medical students. Methods A cross-sectional study with a random sample (n = 346) of medical students at a Brazilian university was performed. The Beck Depression Anxiety Inventory was used to measure anxiety and depression levels. Crude and adjusted analyses were performed using Poisson regression. Results The prevalence of anxiety was 35.5% and depression was 32.8%. The prevalence of anxiety and depression was 14% higher and 16% higher among women (p = 0.025 and p = 0.006, respectively). Students whose parents were not physicians reported 23% higher prevalence of anxiety (p = 0.006), and those who had physician parents reported 29% higher prevalence of depression (p = 0.034). Those who always or often felt pushed by their parents showed 22% higher prevalence of anxiety (p =.006) and 19% higher depression (p = 0.016). Students who had concerns over the future had 15% higher prevalence of depression (p = 0.017). Conclusion The prevalence of anxiety and depressive symptoms was higher than the average found in the general population.

Personality and Depression

The aim of this study was to illustrate the associations of personality variables and depression. The first study population consisted of 50 patients with DSM-IV defined major depressive disorder. Subjects were randomized to receive either fluoxetine medication or short-term psychodynamic psychotherapy. The Hamilton Depression Rating Scale was completed at the baseline and in the follow-up at four months. Baseline mature defense style measured with the Defense Style Questionnaire predicted favourable outcome in the fluoxetine treatment group, whereas no associations were found in psychotherapy group. The Psychological Mindedness Scale scores were not predictive for recovery in patients receiving psychotherapy or medication. The Psychological Mindedness Scale seems not to be useful in selecting optimal treatment in major depressive disorder. Harm Avoidance measured with the Temperament and Character Inventory associated with the baseline severity of the depressive state. In the fluoxetine treatment group high Reward Dependence, high Self-Directedness and high Cooperativeness were predictive for more severe depression in the four months follow-up, whereas no associations were found in the psychotherapy treatment group. It is possible that the result reflects the differences in the placebo response. The second data were derived from the Finnish Public Sector Study. These prospective studies with four years follow-up focused on the predictive value of optimism and pessimism, first, to work disability with a diagnosis of depression lasting at least 90 days and returning to work (N= 38214) , and second, to the likelihood of initiating antidepressant medication treatment lasting at least 100 days and ending the treatment (N= 29930). Results show that low optimism associates with the elevated risk of work disability and higher likelihood of antidepressant use. High pessimism associated with higher likelihood starting at least 100 days antidepressant medication and not stopping medication during the follow up. High pessimism did not seem to predict the entering to depression related work disability, but in the case of disability period it associated with the lower likelihood of returning to work. The thesis shows that personality features play a role as a vulnerability factor, and influence the onset and course of depression. Taking these factors into account more than is currently done may increase the possibilities to enhance the treatment results in depression.

Accuracy and efficiency evaluation of point-centered quarter method variations for vegetation sampling in an araucaria forest

In order to verify Point-Centered Quarter Method (PCQM) accuracy and efficiency, using different numbers of individuals by per sampled area, in 28 quarter points in an Araucaria forest, southern Paraná, Brazil. Three variations of the PCQM were used for comparison associated to the number of sampled individual trees: standard PCQM (SD-PCQM), with four sampled individuals by point (one in each quarter), second measured (VAR1-PCQM), with eight sampled individuals by point (two in each quarter), and third measuring (VAR2-PCQM), with 16 sampled individuals by points (four in each quarter). Thirty-one species of trees were recorded by the SD-PCQM method, 48 by VAR1-PCQM and 60 by VAR2-PCQM. The level of exhaustiveness of the vegetation census and diversity index showed an increasing number of individuals considered by quadrant, indicating that VAR2-PCQM was the most accurate and efficient method when compared with VAR1-PCQM and SD-PCQM.

Impact of bariatric surgery on depression and anxiety symptons, bulimic behaviors and quality of life

OBJECTIVE: To assess psychiatric symptoms, substance use, quality of life and eating behavior of patients undergoing bariatric surgery before and after the procedure.METHODS: We conducted a prospective longitudinal study of 32 women undergoing bariatric surgery. To obtain data, the patients answered specific, self-administered questionnaires.RESULTS: We observed a reduction in depressive and anxious symptoms and also in bulimic behavior, as well as an improved quality of life in the physical, psychological and environmental domains. There was also a decrease in use of antidepressants and appetite suppressants, but the surgery was not a cessation factor in smoking and / or alcoholism.CONCLUSION: a decrease in psychiatric symptoms was observed after bariatric surgery, as well as the reduction in the use of psychoactive substances. In addition, there was an improvement in quality of life after surgical treatment of obesity.

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1811 (T4).

Journal des avoués : ou Recueil général des lois, décrets impériaux, décisions du Conseil d'état et de ministres, arrêts et jugemens qui fixent un point de la procédure civile, criminelle ou commerciale

1826 (T31).