Subprograms for integrating the equations of motion of satellites. FORTRAN 4

The subprograms for the formation of the right members of the equations of motion of artificial Earth satellites (AES), integration of systems of differential equations by Adams' method, and the calculation of the values of various functions from the AES parameters of motion are described. These subprograms are written in the FORTRAN 4 language and constitute an essential part of the package of applied programs for the calculation of navigational parameters AES

Reduction of longitudinal axial residual stresses in near-root region of circumferential joint of steam pipeline in technological way

The paper proposes a variant for solving the problem of reduction of longitudinal residual stresses in near-root region of a circumferential welded joint of section of steam pipeline by FEM simulation of the stress-strain state of repaired section of a circumferential weld in the zone of lack of root penetration on a thin-wall shell of 89 mm diameter and 6 mm wall thickness from steel 20. The result of solving the problem is total distribution of stresses and residual plastic deformations in the repaired zone

EVALUATION OF THE EFFICIENCY OF COMBINATION THERAPY WITH HYALURONATES IN PATIENTS WITH HIP OSTEOARTHROSIS

Objective: to make the results of treatment for coxarthrosis better via prosthetic synovial fluid replacement, by improving drug delivery into the joint cavity. Subjects and methods. The clinical trial enrolled 359 outpatients treated for coxarthrosis. A control group comprised 50 patients receiving the intraarticular combination drug Alflutop under ultrasound (US) guidance. A study group included 309 patients treated using a new three-stage procedure. At stage 1, the patients were given periarticular injections of the current enzyme preparation longidase with a hyaluronidase activity of 3000 IU. At stage 2, postisometric relaxation sessions were performed. At stage 3, after defining the optimal access, synovial fluid prosthetic devices were inserted into the joint cavity under US guidance (a total of 2-3 injections) once weekly. To evaluate the efficiency of the developed treatment option, the authors used a number of standard tests, WOMAC index, Leken's index, integral index of lower limb dysfunction, needs for nonsteroidal anti-inflammatory drugs; total treatment scores given by a physician and a patient; quality of life estimation using the SF-36 questionnaire. Results. The developed treatment option could significantly reduce the clinical and functional WOMAC index and Leken's index, and inadequate joint function in the immediate period and a year after the treatment performed. It also considerably improved quality of life in patients with hip osteoarthrosis, which appeared as a significant increase of its rating according to eight SF-36 scales during more than a year

Resolving vibrational from electronic coherences in two-dimensional electronic spectroscopy: The role of the laser spectrum

The observation of coherent quantum effects in photosynthetic light-harvesting complexes prompted the question whether quantum coherence could be exploited to improve the efficiency in new energy materials. The detailed characterization of coherent effects relies on sensitive methods such as two-dimensional electronic spectroscopy (2D-ES). However, the interpretation of the results produced by 2D-ES is challenging due to the many possible couplings present in complex molecular structures. In this work, we demonstrate how the laser spectral profile can induce electronic coherence-like signals in monomeric chromophores, potentially leading to data misinterpretation. We argue that the laser spectrum acts as a filter for certain coherence pathways and thus propose a general method to differentiate vibrational from electronic coherences

Optimization of preoperative planning and intraoperative navigation at the shoulder replacement

There were 105 patients with shoulder replacement under our supervision (terms of supervision were up to 10 years). There were 43 men and 62 women. Age of patients was from 29 to 80 years. Two ways of optimization of shoulder replacement are offered: "Method of preoperative determination of the sizes of a head of shoulder joint endoprosthesis" (Patent of the Russian Federation N 2469670 d.d. 12.20.2012) and "Method for intraoperative navigation of a shoulder stem of joint" (Patent of the Russian Federation N 2467725 d.d. 11.27.2012). We reached the improvement of quality of the operation due to the fact of an installation of the implants which are as much as possible close to the anatomy of a normal shoulder joint by size and position

Clinical case of the surgical treatment of complete rupture of distal biceps tendon using two cortical buttons

Distal biceps tendon injuries mainly occur in men from the active groups of population. Among the athletes and military personnel, the incidence rate is 2–10  % of  the  upper limb tendon injuries. Comparative studies have shown the achievement of better functional results in surgical treatment, while maintaining overall complication rate of 4.6–25 %. The aim. To demonstrate a new reinsertion technique with two cortical buttons in case of complete rupture of distal biceps tendon as part of a clinical case. Materials and methods. The article presents a clinical case of surgical treatment of a patient with complete rupture of dominant limb distal biceps tendon which was more than 2 weeks old and was accompanied by lacertus fibrosus provocation and persistent muscle retraction. Results. We obtained the following clinical results by the week 24 after the surgery: VAS (Visual Analogue Scale) score – 1  cm, ASES (American Shoulder and Elbow Surgeons) score – 99  points, DASH (Disabilities of the Arm, Shoulder and Hand) score – 15 points. Dynamometry results: Dex. 85; sin. 90 (2daN); range of motion corresponds to the same of a healthy joint. MRI at 1.5 T shows no signs of synostosis or heterotopic ossification; MSCT shows no signs of migration of cortical buttons in comparison with intraoperative X-ray control. Discussion. Extracortical methods of distal biceps tendon positioning in anatomical reinsertion have lower strength indicators, comparable with the use of transosseous sutures and anchor fixators. A larger area of contact of the studied zone in case of minimal tendon compression in the area of proximal radioulnar space or inside the formed radial bone canal provides high strength indicators and reduces the risk of repeated injury. Conclusion. The scores of the scales (VAS, DASH, ASES) turned out to be better than when using other common methods. The technique of dipping distal biceps tendon stump into the formed oval canal of the “anatomical impression” using the proposed method meets the objectives of careful attitude to the tendon and provides the largest area of its contact with the bone

Endoprosthesis replacement at the treatment of elbow joint defects

Results of 25 total endoprosthesis operations in patients with defects of the elbow joint of various ethiology are analysed. The endoprostheses produced by Endoservis (Russia] and Coоnrad/Mоrrey Zimmer (USA] were used. The technique of operation and postoperative rehabilitation is described in the article. The estimation of results of treatment was performed by «the Estimation of surgery of an elbow» (American Shoulder and Elbow Surgeons (ASES] Assessments; Richards R.R. et al. 1994]. Radiographically the results of treatment were estimated by the method of X-ray stability of the implants by O.A. Kudinov, V.l. Nujdin. The majority of patients undergoing arthroplasty of the elbow joint for its defects were of young age (40-45 years], and that has left its mark on the technology of operation and maintenance of the patients in different periods after surgery. The analysis of results of treatmentfor 1 year until 1-15 years after the operation was carried out. Good and excellent results, were received in 68 %, satisfactory - in 30 %. The unsatisfactory result of endoprosthesis surgery took place in 8 % of operated (2 patients]. It has been established that the endoprosthesis replacement for elbow joint defects in high-tech surgery is definitely an alternative to traditional methods of treatment, and in most cases should be seen as a method of choice for treatment of this disease