Introduction. The shear strength of concrete, while not being an independently standardized indicator concrete quality, plays important role in the analysis reinforced structures. concepts related to dependence on compressive and axial tensile are quite ambiguous. Self-compacting (SCC), which has been widely used recently, is somewhat different from ordinary (OC) compacted by vibration terms st...

The development of perspective concrete mixes capable resisting the action external loads is an important scientific problem in modern construction industry. This article presents a study influence steel, basalt, and polypropylene fiber materials on concrete’s strength deformation characteristics. A combination various types dispersed reinforcement considered, by methods mathematical planning e...

Surfaces of carbon fibre roving were modified by means of a low temperature plasma treatment to improve their bonding with mineral fines; the latter serving as an inorganic fibre coating for the improved mechanical performance of carbon reinforcement in concrete matrices. Variation of the plasma conditions, such as gas composition and treatment time, was accomplished to establish polar groups o...

The paper gives an overview on the meta-data specification for administrating and enforcing enterprisewide security for heterogeneous and distributed information systems. The meta-data serves as a basis to maintain enterprise-wide security information centrally, to integrate isolated security specifications, to keep the consistency between different security policies, and to perform access cont...

This paper addresses the security of public-key cryptosystems in a \multi-user" setting, namely in the presence of attacks involving the encryption of related messages under di erent public keys, as exempli ed by H astad's classical attacks on RSA. We prove that security in the single-user setting implies security in the multi-user setting as long as the former is interpreted in the strong sens...

We identify a flaw in the security proof and a flaw in the concrete security analysis of the WOTS-PRF variant of the Winternitz one-time signature scheme, and discuss the implications to its concrete security.