Adjustment disorder new module: the adaption and validation of a self-report questionnaire for the assessment of adjustment disorder

Currently, Adjustment Disorder is viewed in diagnostic manuals as an exclusion diagnosis. There is evident need to better delineate between Adjustment Disorder and other disorders commonly overlapping with this disorder. The aim of this study was to validate the Estonian version of the ADNM (Adjustment Disorder New Module) questionnaire (Maercker et al., 2007) assessing patients recently diagnosed with Adjustment Disorder. In order to adapt and validate this questionnaire, a sample of clinical patient group (n=46) was obtained and data was collected using a package of self-report questionnaires (ADNM questionnaire, EST-Q-2; BDI; GHQ-26 and PCLC). Logisical regression analysis was used to predict the odds ratios of the presence of Adjustment Disorder and correlations between the ADNM questionnaire, other measuring instuments and the psychiatric diagnoses. The results showed that the subscale of the ADNM questionnaire which had been added Estonia-specific items yielded significant correlations with the EST-Q-2 Fatigue and Depression category. Based on the current sample, the overall validity of the questionnaire is poor – thus giving evidence that the diagnosing criteria of Adjustment Disorder might be specific to cultural backgounds.http://tartu.ester.ee/record=b2656696~S1*es

Teismeliste väärtuste kujundamine: õpetajate, huvijuhtide ja noorsootöötajate tegevus ning 9. klassi õpilaste arvamus sellest Põlva maakonna näitel

http://www.ester.ee/record=b4688648*es

Agiilsete printsiipide rakendamine Keskkonnaministeeriumi haldusala projektide juhtimisel

https://www.ester.ee/record=b5453097*es

Effect of Nanocrystalline Diamond Films Deflection on Wear Observed in Reciprocating Sliding Tests

The present study deals with the tribological behavior of nanocrystalline diamond (NCD) films. The diamond films were deposited by microwave plasma enhanced chemical vapor deposition (MPCVD) in methane/hydrogen/air plasma on the Si(100) substrates. The tribological properties were studied by reciprocal sliding tests against Si3N4 balls. The depth profiles and surface morphology of the wear scars were investigated by means of mechanical profilometry and scanning electron microscopy (SEM). Various adaptation processes occur between contacting surfaces including asperity polishing, formation of carbonaceous tribolayer and ripple patterns on the wear scar surfaces. The film deflection is the specific form of adaptation decreasing contact pressure and, therefore, the damage (including wear) of both counter bodies. The deflection of NCD films in sliding tests can be related with the effect of fatigue

The Conservation of Early Post-Medieval Period Coins Found in Estonia

This article deals with archaeological find material with a low silver content and the problems of conserving such material. The aim of the research was to find the most suitable method for the conservation of poorly preserved early post-medieval period coins with varying composition. For this, first, the composition of both the metal and the corrosion products of the archaeological coins were analysed, after which comparative experiments of different cleaning methods were carried out in order to find out the least harmful and most efficient method. A test was also performed to determine the necessity and efficiency of stabilizing the surface of the coins after cleaning

Reactive Sintering of Bimodal WC-Co Hardmetals

Bimodal WC-Co hardmetals were produced using novel technology - reactive sintering. Milled and activated tungsten and graphite powders were mixed with commercial coarse grained WC-Co powder and then sintered. The microstructure of produced materials was free of defects and consisted of evenly distributed coarse and fine tungsten carbide grains in cobalt binder. The microstructure, hardness and fracture toughness of reactive sintered bimodal WC-Co hardmetals is exhibited. Developed bimodal hardmetal has perspective for demanding wear applications for its increased combined hardness and toughness. Compared to coarse material there is only slight decrease in fracture toughness (K1c is 14.7 for coarse grained and 14.4 for bimodal), hardness is increased from 1290 to 1350 HV units.DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7511</p

Characterization of TiC-FeCrMn Cermets Produced by Powder Metallurgy Method

TiC-NiMo cermets combine relatively low density with high hardness. Because nickel is known as a toxin and allergen and allergy to nickel is a phenomenon which has assumed growing importance in recent years there has been a flurry of activity to find alternatives to the nickel binder in cermets. It is also the global research and technical development trend in the powder metallurgy cermets industry. In present research TiC-based cermets with FeCrMn binder system were fabricated. Three different sintering conditions were used (vacuum sintering, sinter/HIP and sintering under low Ar pressure). Because of high vapor pressure of manganese different sintering conditions and technologies were investigated to depress the Mn-loss during sintering. Chemical composition of TiC-FeCrMn cermets after different sintering conditions were analyzed by energy-dispersive X-ray spectroscopy (EDS) and mechanical properties – hardness and fracture toughness were evaluated on the samples. Results of research showed that Ni-free TiC-based CrMn-steels bonded cermets compare unfavorably with cermets bonded with CrNi austenitic steels in terms of fracture toughness and corrosion resistance. Noticeable Mn-loss during vacuum sintering can be avoided when sintering under low Ar gas pressure.DOI: http://dx.doi.org/10.5755/j01.ms.21.3.7364</p

The Influence of Cr3C2 and VC as Alloying Additives on the Microstructure and Properties of Reactive Sintered WC-Co Cermets

Investigated WC-Co cermets were produced via reactive sintering. In case of reactive sintering the elemental powders of tungsten, carbon black as graphite source and cobalt at first activated throw high energy milling and then the carbide synthesis is taking place in the same cycle with liquid phase sintering of the cermets. Because there is a lack of information about the influence of alloying additives on the reactive sintered WC-Co cermets, small amount of chromium carbide or vanadium carbide was added to the powders. To investigate the influence of carbon content in initial powder mixture on the microstructure and properties of reactive sintered WC-Co cermets alloyed with Cr3C2 and VC cermets with different carbon content were produced. The hardness, transverse rupture strength and erosion resistance of alloyed WC-Co cermets depending on carbon content in initial powder mixture is exhibited.DOI: http://dx.doi.org/10.5755/j01.ms.18.1.1347</p

Comparison of Plasma Transferred Arc and Submerged Arc Welded Abrasive Wear Resistant Composite Hardfacings

EComposite hardfacings produced by Plasma Transferred Arc Welding (PTAW) and Submerged Arc Welding (SAW) possess a good combination of hardness, wear resistance and fracture toughness, thus providing high wear resistance. Although they cannot substitute and be compared with conventional WC-Co based hardmetals, still they can be used in many applications where high wear resistance, hardness and toughness are in great demand. In this study two different hardfacing production technologies PTAW and SAW, were used to produce the hardfacings for abrasive wear conditions. In both cases hardfacings were welded on the top of low alloy steel using different proportions of disintegrator milled hardmetal WC-Co powder of different fractions as a reinforcement and self-fluxing alloy as a matrix. They were analysed in regard to Rockwell and Vickers hardness, wear behaviour, and microstructural analysis. SAW hardfacings were subjected to Rockwell hardness test after process and after two cycles of tempering; secondary hardness effect was detected as increment of hardness values from 39 HRC to 58 HRC after first cycle of tempering. High Vickers hardness values did not correlate with wear results, as it commonly shows hardness of hardmetal particles. Dissolution of hardmetal particles in the matrix was observed in both PTAW and SAW hardfacings with higher amount in the later. This amount correlated with heat input during welding process. Wear test results in abrasive emery wear (AEMW) and abrasive wheel wear test (AWW) showed almost analogous tendency, with slightly lower wear in later. Both types of hardfacings have shown promising results in intensive wear conditions. DOI: http://dx.doi.org/10.5755/j01.ms.24.2.19121</p