The Influence of Microstructure on Hydrogen Diffusion and Embrittlement of Multiphase Fine-Grained Steels with Increased Plasticity and Strength

The influence of microstructure on hydrogen diffusion and embrittlement of multiphase fine-grained structural steels with increased plasticity and strength was studied with electrochemical experiments which provide the hydrogenation of specimens in conditions simulating practice requirements. By means of all experimental data obtained from permeation experiments, mechanical investigations, SEM and EDS analyses, TRIP steel has shown greater resistance to hydrogen embrittlement than DP steel, testified by lower index of hydrogen embrittlement, lower diffusion coefficient, less inclusions and favourable microstructure with residual austenite. Namely, the residual austenite in the aspect of hydrogen embrittlement is a favourable phase in relation to martensite, because of its higher solubility of carbon and hydrogen and lower hardness. Therefore, TRIP steel could be considered the more suitable structural material than DP steel for application in conditions where contact with hydrogen is inevitable

Usporedba korozijskih svojstava nekih zubnih slitina

In this paper corrosion resistance of experimental dental Co-Cr-X (X = Mo, Ni) alloys, high purity titanium and Ag-amalgam was studied in Ringer’s solution. On the basis of electrochemical measurements, the relevant indicator of general corrosion jcorr, which is used for ranking of materials, was determined. It was found that commercial alloy Wironit® is the most stable material followed by pure titanium, Co-Cr-Mo and Co-Cr-Ni alloys, while amalgam showed the lowest resistance in the experimental conditions of model oral cavity medium.U ovom radu ispitana je korozijska otpornost eksperimentalnih zubnih Co-Cr-X (X = Mo, Ni) slitina, titana i Ag-amalgama u Ringerovoj otopini. Na osnovi elektrokemijskih mjerenja određen je relevantni pokazatelj opće korozije jkor, koji se koristi za rangiranje materijala. Pokazalo se, da je korozijski najstabilnija komercijalna slitina Wironit®, koju slijede čisti titan, te Co-Cr-Mo i Co-Cr-Ni slitine, dok se amalgam pokazao najmanje otpornim u ispitnim uvjetima koji simuliraju medij usne šupljine

Pregnancy related anxiety and general anxious or depressed mood and the choice for birth setting:A secondary data-analysis of the DELIVER study

BACKGROUND: In several developed countries women with a low risk of complications during pregnancy and childbirth can make choices regarding place of birth. In the Netherlands, these women receive midwife-led care and can choose between a home or hospital birth. The declining rate of midwife-led home births alongside the recent debate on safety of home births in the Netherlands, however, suggest an association of choice of birth place with psychological factors related to safety and risk perception. In this study associations of pregnancy related anxiety and general anxious or depressed mood with (changes in) planned place of birth were explored in low risk women in midwife-led care until the start of labour. METHODS: Data (n = 2854 low risk women in midwife-led care at the onset of labour) were selected from the prospective multicenter DELIVER study. Women completed the Pregnancy Related Anxiety Questionnaire-Revised (PRAQ-R) to assess pregnancy related anxiety and the EuroQol-6D (EQ-6D) for an anxious and/or depressed mood. RESULTS: A high PRAQ-R score was associated with planned hospital birth in nulliparous (aOR 1.92; 95% CI 1.32–2.81) and parous women (aOR 2.08; 95% CI 1.55–2.80). An anxious or depressed mood was associated with planned hospital birth (aOR 1.58; 95% CI 1.20–2.08) and with being undecided (aOR 1.99; 95% CI 1.23–2.99) in parous women only. The majority of women did not change their planned place of birth. Changing from an initially planned home birth to a hospital birth later in pregnancy was, however, associated with becoming anxious or depressed after 35 weeks gestation in nulliparous women (aOR 4.17; 95% CI 1.35–12.89) and with pregnancy related anxiety at 20 weeks gestation in parous women (aOR 3.91; 95% CI 1.32–11.61). CONCLUSION: Low risk women who planned hospital birth (or who were undecided) more often reported pregnancy related anxiety or an anxious or depressed mood. Women who changed from home to hospital birth during pregnancy more often reported pregnancy related anxiety or an anxious or depressed mood in late pregnancy. Anxiety should be adequately addressed in the process of informed decision-making regarding planned place of birth in low risk women

Workplace Mobbing

Mobbing odnosno zlostavljanje na radnome mjestu predstavlja neprijateljsku i neetičnu komunikaciju, koja je sustavno usmjerena od jednoga ili više pojedinaca prema, uglavnom, jednom pojedincu, koji je zbog mobbinga gurnut u poziciju u kojoj je bespomoćan ili se ne može obraniti te držan u njoj s pomoću stalnih zlostavljačkih (mobinških) aktivnosti. U članku je obrađeno nekoliko bitnih značajki zlostavljanja: ponašanja karakteristična za zlostavljača, organizacijski uzroci pojave, konflikt u poduzeću kao njegov povod, žrtva, izvanorganizacijski čimbenici njegova razvoja te posljedice zlostavljanja. Suvremeni poslovni svijet je kompleksan, dinamičan i promjenljiv te zahtijeva sve veću umješnost i sposobnost prilagodbe. Sukobi su dakako neizbježan dio svake organizacije, ali ih je menadžment dužan pravodobno prepoznati i njima upravljati radi sprječavanja štetnih posljedica za produktivnost i troškove poduzeća, radi zaštite zaposlenika te suzbijanja psihičkih i tjelesnih poremećaja koji nastaju psihičkim nasiljem i iskrivljenim oblikom ponašanja kakav je mobbing. On je problem suvremenog društva, nov i u nas nedostatno istražen oblik kršenja ljudskih prava. Zbiva se uglavnom na psihološkoj razini, negativno utječe na zdravlje i život, kvalitetu rada, proizvodnju i pružanje usluga, produktivnost i profitabilnost te značajno utječe na ekonomske gubitke u zajednici. Zlostavljanje na radnome mjestu treba rješavati multidisciplinarno: inicirajući zajedničke aktivnosti zaposlenika i uprave, uključujući medicinske stručnjake, pravnike, pa i društvenu zajednicu u cjelini. Što se u organizaciji više teži izvrsnosti koja se temelji na povjerenju i radnoj etici, to je veća vjerojatnost njegovog sprječavanja i rješavanja.Workplace mobbing is a hostile and unethical communication, systematically aimed from one or more individuals towards mostly one individual, who are forced into a helpless position and are held in it by constant bullying. This article describes some of the most important characteristics of mobbing: offensive behaviour, organizational and non-organizational causes of this behaviour, the victim, and the consequences. Modern business environment is complex, dynamic, volatile, and requires better ability to adjust. Constant changes are a part of organizational reality, but they also produce an ideal environment for all kinds of conflicts. Conflicts are inevitable in every organization, but the task of its management is to identify them and resolve before they affect the workforce, productivity, and costs. The idea is to avert psychological abuse and aberrant behaviour such as mobbing that may cause physical and mental disorders. Mobbing is a problem of the modern society; as a violation of human rights it is relatively new and unrecognised in Croatia. Abuse is mostly psychological; it affects the victim’s health and life, quality of work, productivity, profitability, and may lead to significant economic losses in the community. Mobbing can be averted by joint forces that would involve employees and management, medical and legal professionals, and even community as a whole. The more an organization pursues excellence based on trust and business ethics, the higher the probability that mobbing will be averted or stopped

PIT NUCLEATION ON AS-CAST ALUMINIUIM ALLOY AW-5083 IN 0.01M NaCl

Abstract The use of aluminium alloys in a wide range of technical applications is related mostly to the two fact

Pit nucleation on as-cast aluminiuim alloy AW-5083 in 0.01M NaCl

The use of aluminium alloys in a wide range of technical applications is related mostly to the two facts: they facilitate weight saving of final products (if compared to the steel) and they are prone to spontaneous passivity due to the coherent surface oxide layer which impedes further reaction of aluminium with the environment. Among the commercial Al alloys, EN AW-5083 alloy is a representative non-heat treatable Al-Mg based alloy which possesses many interesting characteristics as a structural material, such as low price, moderately high strength, high formability in conjunction with superplasticity and good corrosion resistance in marine atmospheres. Aiming to enhance the knowledge of possible interactions of studied alloy EN AW-5083 in as-cast condition with chloride media, electrochemical measurements were used to follow the pitting behaviour in 0.01 M NaCl. The results of tests have shown that susceptibility of alloy to pitting corrosion is strongly influenced by the microstructural constituents of the alloy in as-cast condition

The Influence of Microstructure on Hydrogen Diffusion and Embrittlement of Multiphase Fine-Grained Steels with Increased Plasticity and Strength

The influence of microstructure on hydrogen diffusion and embrittlement of multiphase fine-grained structural steels with increased plasticity and strength was studied with electrochemical experiments which provide the hydrogenation of specimens in conditions simulating practice requirements. By means of all experimental data obtained from permeation experiments, mechanical investigations, SEM and EDS analyses, TRIP steel has shown greater resistance to hydrogen embrittlement than DP steel, testified by lower index of hydrogen embrittlement, lower diffusion coefficient, less inclusions and favourable microstructure with residual austenite. Namely, the residual austenite in the aspect of hydrogen embrittlement is a favourable phase in relation to martensite, because of its higher solubility of carbon and hydrogen and lower hardness. Therefore, TRIP steel could be considered the more suitable structural material than DP steel for application in conditions where contact with hydrogen is inevitable