Study of Nano h-BN Impact on Lubricating Properties of Selected Oil Mixtures.

Our experiments aimed to study the influence of layered materials with nanometric-scale particles, which are part of lubricant oils, on their tribological properties. The object of this study was a lubricant oil made using base oil PAO4, which contained nanoparticle hexagonal boron nitride (nano h-BN) and a dispersant based on succinic acid imide. Comparative tests for engine oil (CB30) were also performed.

Research on the Influence of the Manufacturing Process Conditions of Iron Sintered with the Addition of Layered Lubricating Materials on its Selected Properties.

The purpose of the conducted experiments was to test the selected properties of materials intended for porous sintered bearings containing layered materials in the form of powders with an average particle size of 0.5-1.5 μm, with very good tribological properties.

Influence of Manufacturing Technology on the Structure of 80W-20Re Heavy Sinters.

Preliminary measurement results of 80W-20Re heavy sinters are presented in this paper. Tested samples were taken from three different technology processes, i.e.

The Amphoteric and Hydrophilic Properties of Cartilage Surface in Mammalian Joints: Interfacial Tension and Molecular Dynamics Simulation Studies.

In this paper, we explain the amphoteric character of the cartilage surface by studying a lipid bilayer model built from phospholipids. We examined the interfacial tension values and molecular dynamics simulation in solutions of varying pH. The effects of negative and positive charge density (or fixed charges) on the (cartilage/cartilage) friction coefficient were investigated.

Production of High-Purity Anhydrous Nickel(II) Perrhenate for Tungsten-Based Sintered Heavy Alloys.

This paper presents a method for the production of high-purity anhydrous nickel(II) perrhenate. The method comprises sorption of nickel(II) ions from aqueous nickel(II) nitrate solutions, using strongly acidic C160 cation exchange resin, and subsequent elution of sorbed nickel(II) ions using concentrated perrhenic acid solutions. After the neutralization of the resulting rhenium-nickel solutions, hydrated nickel(II) perrhenate is then separated and then dried at 160 °C to obtain the anhydrous form.

[An attempt to identify to cryptogamic plants in Syreniusz's herbal].

The current paper constitutes an attempt to identify the algae, fungi, lichens and liverworts mentioned in the extensive Herbal by Syreniusz, published in Cracow in 1613. All four algae mentioned are maritime species. As for fungi, Syreniusz described the fungus Fomitopsis officinalis, which was then used in medicine, and he listed several Polish names of edible and poisonous macromycetes, and also mentioned rust on wheat.

[Adenocarcinoma of the lung with metastases to the pituitary and both adrenal glands].

A case of lung adenocarcinoma with metastases in both adrenals and pituitary gland in 52-year old patient is presented. Adrenal glands metastases were diagnosed on a base of CT scans. Pituitary metastases caused gradual loss of vision.

Posttraumatic craniofacial reconstruction using combined resorbable and nonresorbable fixation systems.

The facial skeleton consists of high-stress-bearing buttresses and low-stress-bearing curved surfaces. The buttresses are like trusses made of beams, struts, and columns. They resist tensile, compressive, and shear loading.

Selected cytokines and soluble forms of cytokine receptors in coronary artery disease.

Background: Cytokines may play a role in the pathogenesis of atherosclerosis and coronary artery disease (CAD). Methods: We examined serum concentrations of selected pro- (TNFalpha, IL-2) and anti-inflammatory (IL-10) cytokines, and soluble forms of TNF receptors (sTNFR 1 and sTNFR 2) by ELISA in 45 patients with stable exertional angina (group 1), 32 patients with unstable angina (group 2), and 20 healthy subjects (group C). Results: Serum concentrations of both TNFalpha (group 1, 18.