Clinical case of intraocular correction of high-degree anisometropia

The paper describes a clinical example of the intraocular correction of high-grade hyperopic anisometropia. Surgical treatment made it possible to restore binocular vision, obtain high visual functions without additional correction, preserve the accommodative ability of the eye, and achieve rapid visual rehabilitation.

Multimedia Archives: New Digital Filters to Correct Equalization Errors on Digitized Audio Tapes

Multimedia archives face the problem of obsolescing and degrading analogue media (e.g., speech and music recordings and video art). In response, researchers in the field have recently begun studying ad hoc tools for the preservation and access of historical analogue documents. This paper investigates the active preservation process of audio tape recordings, specifically focusing on possible means for compensating equalization errors introduced in the digitization process. If the accuracy of corrective equalization filters is validated, an archivist or musicologist would be able to experience the audio as a historically authentic document such that their listening experience would not require the recovery of the original analogue audio document or the redigitization of the audio. Thus, we conducted a MUSHRA-inspired perception test (n = 14) containing 6 excerpts of electronic music (3 stimuli recorded NAB and 3 recorded CCIR). Participants listened to 6 different equalization filters for each stimulus and rated them in terms of similarity. Filters included a correctly digitized “Reference,” an intentionally incorrect “Foil” filter, and a subsequent digital correction of the Foil filter that was produced with a MATLAB script. When stimuli were collapsed according to their filter type (NAB or CCIR), no significant differences were observed between the Reference and MATLAB correction filters. As such, the digital correction appears to be a promising method for compensation of equalization errors although future study is recommended, specifically containing an increased sample size and additional correction filters for comparison.

NOISE PROTECTIVE SCREENS AS MEANS OF OPTIMIZATION OF NOISE MODE

One of factors that negatively influence on an environment is noise. Noise can negatively influence on a health man. Determination of effective measures of noise rotection of workplaces became the aim of our researches. Certainly, that the most more showy measure are the so-called screens. It is significant, it is the most effective entrance of the city. They became the theme of our research. By us were the studied systems of classifications of screens. They are divided depending on such parameters: on the method of action; after a geometrical form; after an outline in a plan; after the method of arranging, on material. Defining advantages or lacks of the two following charts is impossible (id est there is not sense). They are accepted as given. Consideration of frequent is carried out from the source of noise, that it is located in a narrow corridor between an abat-voix and other obstacle. For simplification it is possible to accept the location of source of noise directly on the surface of soil: the point of source of noise is successfully approximated by a location directly on the surface of soil; distance between this surface and very had an actual mestome to the locations, easily yields to the calculation, i always can be a little rather entered in a calculation as an insignificant additional correction. If we consider reflections not from the left, but from the right screen, absolutely adequate formulas can be derived, in which (taking into account the mirror symmetry of geometric construction), the corresponding indexes are simply replaced... At some stage, the multiple reflection stops. This happens when the height of one of the reflection points exaggerates the height of one of the screens. The sound beam has nothing more to reflect, and it enters the space (to the sky). Therefore, when describing each reflection, we provide boundary conditions for its happening. A voice ray falls on a screen, and reflected from a that screen under the same corner q. It is suggested to "delete" a voice ray by us, directing him to sky above an oppositely stand-up screen after the first beating back.

New approaches to determining the nutritional treatment tactics in patients with malignant neoplasms

Aim. To determine personalized approaches to the choice of nutritional support (NS) tactics in oncopathology, depending on the stage of carcinogenesis. Materials and methods. Nutritionists consulted 96 patients with oncopathology (colorectal cancer, pancreatic adenocarcinoma) over the period 2018–2019. The stage of carcinogenesis was determined mainly by the morphogenetic signs according to V.S. Turusov. Nutritional status was assessed according to the parameters of the known alimentation-volemic diagnosis and basic metabolic syndromes characteristics in cancer patients. The effectiveness of NS was assessed by the change in lysosomal metabolism. Statistical analysis was performed using Statistica 10 software. Results. Based on such clinical and biochemical analysis, 3 groups of patients were identified: 1) subject only to surgical treatment; 2) subject to combined treatment; 3) palliative. Corresponding to the selected groups, the concept of nutritional extinction was formulated and 3 treatment regimens were proposed, which differ in the use of additional correction of endotoxicosis, analgesic pharmaconutrients, or low-calorie diets. The effectiveness of the nutritional correction was assessed with testing lysosomal metabolism by cathepsins L using enzyme-linked immunosorbent assay. It has been shown that cathepsin L can serve as an early marker of nutritional dysfunction and nutritional prognosis. Conclusion. When determining nutritional treatment tactics in cancer patients, it is advisable to distinguish the stages of nutritional extinction. It is advisable to carry out the assessment of NS effectiveness and nutritional prognosis according to cathepsin L levels. Nutritional counseling allows to determine the tactics of neoadjuvant NS, and in some cases to make adjustments in the choice of surgical aid.

Tenorrhaphy as an Alternative to Resection in the Treatment of Horizontal Strabismus in Children

Purpose. To evaluate the effectiveness of surgical treatment of horizontal strabismus by modified tenorrhaphy in comparison with standard resection in children. Material and methods. For 3 years (2017–2019), 560 patients with horizontal strabismus at the age from 2 to 14 years were operated. Of these, 288 patients (51.4%) underwent tenorrhaphy using a modified technique (main group) as augmentation surgery, 272 patients (48.6%) underwent classical resection (control group). Results. The average age of patients in the main group was 6 (3.46) years, in the control group – 5.8 (3.34) years. In the main group of patients, orthotropy was achieved in 85.4% of cases, in the control group – in 83.5% of cases, p = 0.523. The residual strabismus angle (up to 5°) was observed in 40 patients (14%) in the main group and in 44 patients (16.5%) in the control group of patients, p = 0.449. In the main group, additional correction of the residual angle was performed on the day after the operation using adjustable suture in 8 patients (2.8%). Reoperation in the long-term period was required for 10 patients (3.7%) in the control group and 3 patients (0.7%) in the main group, p = 0.039. Significant postoperative conjunctival thickening was found in 7.2% of patients in the main group. Conclusion. The effectiveness of tenorrhaphy is not inferior to classical resection and, in combination with recession (tenomyoplasty), gives predictable stable results. The tenorrhaphy method is technically simpler, safer, more physiological, can be easily corrected in the immediate postoperative period, has no risk of «losing» muscle and can be recommended as an alternative method of resection.

A case of severe basilar invagination and AAD, corrected using the technique of DCER—distraction, compression, extension, reduction (with spacer + universal reducer)

The author has described his own technique of DCER (distraction, compression, extension, and reduction) to reduce and realign the deformity and relieve spinal compression (indicated in congenital anomalies with occipitalized C1 arch). In addition, he developed special C1–2 spacers and a universal reducer. Here, a 30-year-old male with severe BI (20 mm, above the clivus) with AAD underwent the technique of spacer placement (distraction) followed by cable reduction (leading to compression and extension at the occiput–C1–C2 region). Another short example is presented where an 8-year-old boy (severe BI, AAD with posterior fossa dermoid) underwent additional correction—C2 forward translation and excision of the dermoid.The video can be found here: https://youtu.be/XIMpkYjxgRk

Theoretical analysis and experimental studies on torque friction in magnetic fluid seals

Magnetic fluid seals are among the most common applications of ferrofluids. In such seals, the torque friction results only from the internal friction in the fluid and there is no direct contact between seal elements. Despite this, the heat generated during operation can be significant due to the low volume of the ferrofluid in the seal and high rotational speeds. The difficulty in calculating the torque friction is because the ferrofluid is a non-Newtonian fluid and changes its viscosity under the influence of a magnetic field. In order to measure torque friction in magnetic fluid seals, a special test stand was built. Tests were performed at different rotation speeds, different temperatures, and two seal stage geometries (rectangle and trapezoid). Numerical simulations were performed to determine the magnetic field distribution in the seal. Dynamic viscosity under the influence of the magnetic field was measured on a rotary rheometer. Mathematical models were compared with laboratory results. The results obtained from the calculations in some cases gave overstated values almost twice in value. An additional correction in the case of ferrofluid viscosity is proposed.

COMPENSATION OF NON-SYNCHRONICITY OF RECORDS FOR DOWNHOLE MICROSEISMIC MONITORING SYSTEMS IN CASE OF VTI MEDIA ANIZOTROPY

Downhole microseismic monitoring sometimes includes the installation of several downhole surveillance systems. One of the key hardware requirements is accurate synchronization of the records received. Usually this problem is solved at the hardware level, and in the case of ideal observations, additional correction procedures are not required. In some cases, hardware synchronization is lost, and for the correct use of the observed data, it is necessary to compensate for the shift in synchronization; this compensation is also necessary when synchronization information is lost during data storage and transmission. In this paper, we propose to introduce into inversion an additional parameter responsible for asynchronous recordings and to show that in the case of a simple medium model, this asynchrony can be determined directly from the data. Here we also investigate the dependence of the accuracy of determining synchronization shifts depending on the complexity of the media and the geometry of the observation system.