On relation of two processes with independent increments applied in queueing systems

In the paper, by using two processes ξt and η (t), t ≥ 0 with independent increments, one of which is without negative overshoots and the second one is homogeneous in time, we study a homogeneous Markov process ξt, t ≥ 0, and we find the Laplace transform of the generating function of transitional probabilities of the process ξt, t ≥ 0.Publisher's Versio

On the distribution of the maximum of sums of a sequence of independent and identically distributed random variables

The authors find in terms of generating functions the distribution of the maximum of sums of independent and identically distributed random variables with no negative jumps different from −1.Publisher's Versio

On controlled poisson processes

We consider a special class of two-dimensional Markov processes, finding the relationship between transition probabilities of two such classes.Publisher's Versio

Investigation of the effects of constant darkness and light on blood serum cholesterol, insulin and glucose levels in healthy male rats

This study was designed to investigate the effects of constant darkness and light on changes of serum cholesterol, insulin and glucose levels in healthy male rats. In this study, healthy male rats (n = 30) were divided into 3 groups of tens and kept at various light/dark conditions: Control 12:12 light/dark (LD); constant darkness (DD), and constant light (LL) groups for 2 weeks. Blood samples were obtained from retro-orbital sinus before start of experiment and on the 7th and 14th days of the experimental period. The serum cholesterol and glucose levels were measured by the enzymatic method and insulin levels were measured using insulin kit by enzyme-linked immunosorbent assay (ELISA) method. The results of the study showed that the levels of serum cholesterol and glucose on the 7th and 14th days of the experimental period in DD group significantly decreased compared to the LD and LL groups (p < 0.05). On the 14th day of experiment, we observed significant decrease of serum insulin level in the constant darkness group compared with the two other groups (p < 0.05). The study showed that on the 7th and 14th days of experiment, constant light significantly increased serum glucose level without having any significant effects on serum cholesterol and insulin levels. Also, the long period of time (14 days) was found to be more effective in the serum of these metabolic parameters changes than the short period (7 days).Key words: Constant darkness, light, cholesterol, glucose, insulin, healthy male rats

Early experience with the ARTISENTIAL® articulated instruments in laparoscopic low anterior resection with TME

Background: The notion of articulation in surgery has been largely synonymous with robotics. The ARTISENTIAL® instruments aim at bringing advanced articulation to laparoscopy to overcome challenges in narrow anatomical spaces. In this paper, we present first single-center results of a series of low anterior resections, performed with ARTISENTIAL®. Methods: Between September 2020 and August 2021, at the Department of Surgery, St. Marienkrankenhaus Siegen, Siegen, Germany, patients with cancer of the mid- and low rectum were prospectively enrolled in a pilot feasibility study to evaluate the ARTISENTIAL® articulated instruments in performing a laparoscopic low anterior resection. Perioperative and short-term postoperative data were analyzed. Results: Seventeen patients (10 males/7 females) were enrolled in this study. The patients had a median age of 66 years (range 47–80 years) and a median body mass index of 28 kg/m2 (range 23–33 kg/m2). The median time to rectal transection was 155 min (range 118–280 min) and the median total operative time was 276 min (range 192–458 min). The median estimated blood loss was 30 ml (range 5–70 ml) and there were no conversions to laparotomy. The median number of harvested lymph nodes was 15 (range 12–28). Total mesorectal excision (TME) quality was ‘good’ in all patients with no cases of circumferential resection margin involvement (R0 = 100%). The median length of stay was 9 days (range 7–14 days). There were no anastomotic leaks and the overall complication rate was 17.6%. There was one unrelated readmission with no mortality. Conclusions: Low anterior resection with ARTISENTIAL® is feasible and safe. All patients had a successful TME procedure with a good oncological outcome. We will now seek to evaluate the benefits of ARTISENTIAL® in comparison with standard laparoscopic instruments through a larger study

rac-5-Acetyl-6-hy­droxy-3,6-dimethyl-4-phenyl-4,5,6,7-tetra­hydro-2H-indazole

The title compound, C17H20N2O2, is chiral but crystallizes in a centrosymmetric space group as a racemate, the relative configuration at the stereogenic centres being 2S*,3R*,4S*. The cyclo­hexane ring adopts a half-chair conformation while the pyrazole ring has an envelope conformation. The crystal packing displays inter­molecular O—H⋯N and N—H⋯O hydrogen bonding

CONSERVATIVE FLUIDS AND LUBRICANTS BASED ON TURBINE OIL, NITRO, AMIDO AND PARAFFIN WAX

To create conservation fluids and lubricants based on the oil acids and polyethylene polyamine (PEPA) synthesized amidoamines, and based on α-olefins (C12, C14 and C16-C18) and the nitric acids-nitro compounds. Using of amido, nitro and solid n-paraffins in the turbine oil T-30 (Standard 32-74) formulated lubricants and conservation fluid which are tested under different conditions. It is shown that in comparison with the preservative fluid, the preservative lubrication more effective

The fauna and ecology of wasps of the genus Tachysphex Kohl, 1883 (Hymenoptera: Apoidea: Crabronidae) in Nakhchivan Autonomous Republic of Azerbaijan

An annotated checklist containing 11 species in five species groups of the wasp genus Tachysphex that occur in the Nakhchivan Autonomous Republic is presented. Five species are recorded from Azerbaijan for the first time: Tachysphex ferrugineus Pulawski, 1967, T. nitidus (Spinola, 1806), T. pompiliformis (Panzer, 1803), T. mocsaryi Kohl, 1884 and T. costae (de Stefani Perez, 1882). Six species are recorded from Nakhchivan AR for the first time: Tachysphex consocius Kohl, 1892, T. fulvitarsis (A. Costa, 1867), T. helveticus Kohl, 1885, T. brevipennis Mercet, 1909, T. pulcher Pulawski, 1967, T. dignus Kohl, 1889. Data on landscape and habitat distributions of each species are given