Heat-capacity anomaly in a wide vicinity of the critical point of the triethylamine—water phase transition

The behavior of the isobaric heat capacity in the triethylamine—water binary system has been investigated experimentally by the adiabatic calorimetry method. The possible physical models of the observed effects are discussed. __________ Translated from Inzhenerno-Fizicheskii Zhurnal, Vol. 78, No. 5, pp. 196–200, September–October, 2005.     

Theoretical conformational analysis of cardioactive peptides. II. Nonapeptide Met1-Asn2-Tyr3-Leu4-Ala5-Phe6-Pro7-Arg8-Met9-NH 2

Theoretical conformational analysis was carried out for the cardioactive nonapeptide Met1-Met9-NH2. Calculations yielded the values of all dihedral angles of the back bone and side chains of the nonapeptide various forms as well as intra- and interresidue interaction energies.     

The prevalence of cryptosporidia among agricultural animals in Azerbaijan]

In the paper are presented the data on revealement of cryptosporidian oocysts (Apicomplexa, Sporozoa) in feces of cattle, swine and sheep of different ages and results of the experimental infection of laboratory animals (rats, mice, rabbits, coypus) with the oocysts detected as well. The latters were attributed to Cryptosporidium parvum species. The analysis of the size characteristic in the isolates of naturally and artificially infected hosts has shown that the oocysts dimensions might vary both in different host species and in different individuals of one host species.     

Effect of dentin and fiber post surface treatments with fumaric acid on the bonding ability of fiber posts

This study investigated the effects of fumaric acid on push‐out bond strength when applied to dentin surfaces and fiber posts. The root canals of 60 mandibular premolar teeth were instrumented and obturated. After removing two thirds of filling material, teeth were prepared according to six randomized groups (n = 10/group) defined by two fiber post surface treatments (0.7% fumaric acid or 9% hydrofluoric acid) and three dentin conditioning treatments [control (no conditioning); 17% ethylenediamine tetraacetic acid (EDTA); or 0.7% fumaric acid]. After fiber post‐cementation, three 1‐mm thick discs were obtained from each tooth by transverse sectioning, and each disc underwent push‐out bond strength testing. Data were analyzed with a one‐way analyses of variance (anova ) and t tests; p < .05 was considered statistically significant. Failure modes were determined by stereomicroscopy, and the surface characteristics of dentin and fiber posts were observed by scanning electron microscopy. Push‐out bond strength was greater for the group in which the post surface treated with hydrofluoric acid and the dentin surface treated with fumaric acid than the nontreated dentin and hydrofluoric acid‐treated post group (p < .05). There were no significant differences between other comparison pairs (p > .05). A combination of fumaric acid dentin conditioning and hydrofluoric acid fiber post treatment strengthened the bonding ability of fiber posts.     

Uridine as additive in antisolvent for improving performance and reproducibility of perovskite solar cells

Journal of Materials Science: Materials in Electronics - Today, with their high efficiency of up to 25%, perovskite solar cells are the best alternative to silicon solar panels, which have...     

A comparative study of delayed stroke handling approaches in online handwriting

International Journal on Document Analysis and Recognition (IJDAR) - Delayed strokes, such as i-dots and t-crosses, cause a challenge in online handwriting recognition by introducing an extra...     

Hierarchical cross-training in work-in-process-constrained systems

We study Work-In-Process (WIP)-constrained flowlines staffed by partially cross-trained workers with hierarchical skill sets. We characterize the optimal worker-to-task assignment policy for CONWIP systems with two workers and general stochastic processing times. This leads us to the “fixed-before-shared” principle, which states that a flexible worker should process a task he/she is uniquely qualified for before helping other workers with shared tasks. To provide insights on the performance opportunity of hierarchical cross-training in systems with limited WIP, we provide a complete characterization of the optimal policy and closed-form expressions of the resulting throughput for the case of exponential processing times. We extend our results to the more general case of floater workers, and illustrate their applicability to various real-world systems. Our analysis shows that hierarchical cross-training can provide significant benefits, but should be implemented with care in WIP-constrained environments such as those making use of pull systems.