Solitary Fibrous Tumor of the Great Omentum: A Case Report and Literature Review

Background: We report a case of a 23-year-old man with a solitary fibrous tumor of the great omentum who presented clinically as a case of dull abdominal pain. Case Presentation: Solitary fibrous tumor normally occurs in the visceral pleura. Extrathoracic solitary fibrous tumor is rare, especially those from the great omentum, with approximately 31 cases reported in the literature. Conclusion: After reviewing and summarizing the imaging findings of 31 cases of solitary fibrous tumor of the greater omentum, we considered that the characteristic findings can provide a reliable basis for preoperative diagnosis.

Innovative design of exhaust enthalpy algorithm for small turbine

This paper presents a method to determine the exhaust enthalpy of small steam turbine. Starting from the feed water pump group, the feed water pump and small steam turbine are studied as a whole. Based on the thermodynamic method, the efficiency of the feed water pump is obtained separately, and then the efficiency and exhaust enthalpy of the small steam turbine are deduced. This method only needs to measure the inlet and outlet pressure, temperature, feed water flow of feed water pump, inlet steam pressure, temperature and flow of small turbine. It has the advantages of less measurement parameters, low measurement cost and small measurement error. It provides a reliable basis for a comprehensive understanding of the performance of small steam turbine and guiding its economic and safe operation.

Millstones from Revne at Bukovyna

In the article stones from light hand millstones from Revne group of settlements of the 8th — 10th centuries left by the Slavs — bearers of the Raiky archaeological culture are published (fig. 1; 2). The lithological composition of rocks was determined. The millstones were made of two types of rocks: 1 — organogenic-detrital limestone, layered, cavernous, grayish-yellow (fig. 3: 1, 2); 2 —organogenic detrital limestone, massive, finely cavernous, yellowish-gray (fig. 3: 3). Such rocks are typical for the area of Revne agglomeration. This confirms the local origin of the raw materials (fig. 4). The rocks can be easily processed with iron tools. At the same time, they are strong enough and not prone to fracture and small fracturing. An average density of limestone is 2.7 g/cm3. Millstones are widely known from the materials of the Raiky culture sites (fig. 5). Probably, in all cases, local raw materials were used. On this background mention of the finds of grain graters occurs in scientific literature less often. In the materials of Revne agglomeration of the 8th — 10th centuries grain graters are unknown. Discovered millstones are divided into «spoilage» or blank (fig. 3: 1), bed stone (fig. 3: 2) and runner stone (fig. 3: 3). There is a sufficient basis for the general reconstruction of a light hand millstone. It consists of archaeological finds (stones and occasionally other parts made of iron and wood), ethnographic and iconographic data (fig. 6). All these sources were qualitatively analysed by R. S. Minasyan and he proposed his own classification. Today, we consider his work to be the most generalizing and reliable basis for descriptive reconstruction of the millstone. However, the classification itself is not quite user-friendly. Therefore, we offer systematization as a combination of main features. It is presented in a tabular form (fig. 7). According to the proposed systematization, the millstones from Revne can be characterized as ІІ.2.A—B — bed stone with a hole and a wooden pin (not preserved), with runner stone and rind (not preserved), with a hole for a handle of indeterminate length (not preserved).

Investigating the Vacuum Extractors of Biomedical Devices of Different Materials and Pressures on the Fetal Head during Delivery

Operative delivery requires the use of a vacuum extractor; obstetricians can choose the appropriate vacuum extractor to make the delivery process smoother and safer. However, there is no biomechanical literature focused on the imposed effects of a vacuum extractor prepared with different materials and vacuum pressure on the fetal head during the process of delivery. Therefore, we first established and performed the finite element analytical model to explore the influences of vacuum extractors manufactured from different materials on the fetal head under various extractive pressures. The model of the vacuum extractor was designed as a hemispherical shape, and the material of the vacuum extractor was composed of silicone rubber and stainless steel for comparison. Four different vacuum pressures (500 cm H2O, 600 cm H2O, 700 cm H2O, and 800 cm H2O) were applied as the factors for investigation. The reaction force on the fetal head, von Mises stress of vacuum extractor, and von Mises stress on the skull of fetal head were measured and analyzed to evaluate the effects. The results revealed that subtle divergent influences of different vacuum pressures were observed, and the stainless-steel vacuum extractor induced a larger reaction force (358.04–361.37 N), accompanied with stress (13.547–13.675 MPa), on the fetal head than non-metallic or relatively softer materials. The results provide a reliable basis for selecting proper vacuum extractor during operative delivery to avoid obstetrical complications, such as scalp scratch, cephalohematoma and even intracerebral hemorrhage.

Ukrainian Ethnocultural Processes in the Research Legacy of Leonid Zaliznyak (Devoted to the 70th Anniversary of His Birth)

The article analyzes L. Zalizniak's contribution to the development of modern ethnology, in particular his study of the ancient history of Ukraine, Ukrainian ethnogenesis and modern domestic ethnocultural processes. It reveals that the priority of his research is ethnocultural studies, which in the days of post-Soviet Ukraine acquired perfection and systematic comprehension. It is discovered that the works of the scientist are marked by the thoroughness of the latest methodological approaches, the scale of the issue (from ancient history, Ukrainogenesis, to modern events and reflections on the place of Ukraine among world civilizations), high scientific erudition, and depth of knowledge. It is proved that L. Zalizniak offered the concept of the origin of the Ukrainian people not only to the scientific community, but to the whole Ukrainian society. This concept is based on a deep understanding of the laws specific for the historical process of peoples’ formation and nations’ development. It is substantiated that the scientist continues working on improving this concept, constantly deepening the most important issues of Ukrainian genesis, the formation of the Ukrainian state, the stages of formation of the Ukrainian nation, the place of Ukraine among world civilizations, and more. It is found that the concept of the origin of the Ukrainian people built by prominent scientists is of great political importance, as it is a solid and reliable basis for the establishment of the independent Ukrainian state, while popularization of this concept in the people's consciousness helps preserve the identity of the Ukrainian people in modern ethnocultural space. It is noted that L. Zalizniak actively participated in understanding the core and essence of the undeclared Russian-Ukrainian hybrid warfare, while his scientific works allow to comprehend the past of Ukraine and Ukrainians, professionally encompass Ukrainian ethnocultural processes, help the modern Ukrainian nation defeat the enemy, restore the territorial integrity of the Ukrainian ethnocultural space and preserve the identity of the Ukrainian people at the present stage of its ethnocultural development.

Influence of Carbonization of Concrete Surfaces on their Adhesion with Freshly-Laid Concrete

During operation, concrete and reinforced concrete structures are exposed to the aggressive environment of carbon dioxide. During the reconstruction and overhaul of the berthing facilities in the coastal zone of the seas of the Far East, a weak bond strength of the “old” carbonated and “new” repair concrete has been established in the paper. The reason that prevents reliable adhesion of concrete is the formation of fragile corrosion products in the pores and on the surface of “old” concrete. Accelerated tests of concrete carbonization from exposure to carbon dioxide have been carried out in the course of the study. The structure of the carbonized cement stone has been examined using a scanning electron microscope. The research results have made it possible to assess the structure of a “healthy” cement stone and affected by carbonization. The performed analysis of concrete carbonization process, including micrographs of the samples, has shown that under the action of carbon dioxide, the surface layer with a thickness of 4 mm and more undergoes structural restructuring. Fibrous formations are destroyed, and the carbonized volume is a heap of loosely bound loose new formations and films blocking the entrances to the capillary system of concrete. They are not a reliable basis for adhesion of “new” and “old” concrete and prevent the penetration of liquid containing cement dissolution products from “new” concrete into the capillaries of the healthy structure of the “old” concrete for their reliable connection.

Interactive Effects of Glucocorticoids and Cytochrome P450 Polymorphisms on the Plasma Trough Concentrations of Voriconazole

Aims: To explore the interactive influence of glucocorticoids and cytochrome P450 (CYP450) polymorphisms on voriconazole (VRC) plasma trough concentrations (Cmin) and provide a reliable basis for reasonable application of VRC.Methods: A total of 918 VRC Cmin from 231 patients was collected and quantified using high-performance liquid chromatography in this study. The genotypes of CYP2C19, CYP3A4, and CYP3A5 were detected by DNA sequencing assay. The effects of different genotypes and the coadministration of glucocorticoids on VRC Cmin were investigated. Furthermore, the interactive effects of glucocorticoids with CYP450s on VRC Cmin were also analyzed.Results: The median Cmin of oral administration was lower than that of intravenous administration (1.51 vs. 4.0 mg l−1). Coadministration of glucocorticoids (including dexamethasone, prednisone, prednisolone, and methylprednisolone) reduced the VRC Cmin/dose, respectively, among which dexamethasone make the median of the VRC Cmin/dose ratio lower. As a result, when VRC was coadministrated with glucocorticoids, the proportion of VRC Cmin/dose in the subtherapeutic window was increased. Different CYP450 genotypes have different effects on the Cmin/dose of VRC. Mutations of CYP2C19*2 and *3 increased Cmin/dose of VRC, while CYP2C19*17 and CYP3A4 rs4646437 polymorphisms decreased Cmin/dose of VRC. The mutation of CYP3A5 has no significant effect. Furthermore, CYP2C19*17 mutants could strengthen the effects of glucocorticoids and decrease VRC Cmin/dose to a larger extent.Conclusion: Our study revealed that glucocorticoids reduced the Cmin/dose levels of VRC and different SNPs of CYP450 have different effects on the Cmin/dose ratio of VRC. Glucocorticoids and CYP2C19*17 mutants had a synergistic effect on reducing VRC Cmin/dose. The present results suggested that when VRC is combined with glucocorticoids, we should pay more attention to the clinical efficacy of VRC, especially when CYP2C19*17 mutants exist.

Recognition of cutting rock hardness by hydraulic cylinder pressure

The online identification of rock hardness is the basis to adjust the rotation velocity and swing velocity of cutting head in real time. To effectively identify the hardness of rock around roadway under different cutting conditions, a novel method based on the hydraulic cylinder pressure signal is proposed. Here, we analyze the changing rule of cutting head load under different rock hardness through dynamic simulation, and the transfer characteristics between cutting dynamic load and the hydraulic cylinder pressure. On this basis, a function model between the hydraulic cylinder pressure and the protodyakonov scale of rock hardness is constructed to identify the rock hardness. The average recognition accuracy of the heavy-duty roadheader in the test is 92.01%. The experimental results indicate that the model can effectively identify the rock hardness under different cutting conditions. This study can be used for online identification of rock hardness and provide reliable basis for the automatic control of roadheader.

Demystifying the potential of Global surgery for Public health

Remarkable gains have been made in global health in the last 25 years, and surgical care is anintegral component of healthcare systems for countries at all levels of development. Globalsurgery, which global surgery, which comprises clinical, educational, and researchcollaborations to improve surgical care between academic surgeons in high-income countriesand low- and middle-income countries (LMICs) and their affiliated academic institutions, hasgrown significantly. Global surgery may resonate most with those in low-or-middle-incomecountries (LCMICs), where basic surgery needs are rarely met, and even the most trivialresource may be hard to obtain on a permanent or reliable basis. Therefore, considering this,this article provides an overview on various factors defining the interface between surgery andpublic health at a global level and discuss future directions.

Diagnostic Value of Frequently Implemented Provocative Tests in the Assessment of Shoulder Pain—A Glimpse of Current Practice

Initial evaluation of chronic shoulder disability is a diagnostic challenge due to the anatomic complexity of the shoulder joints. For this purpose, several diagnostic tools utilizing provocative testing exist, but only a few have a reliable basis for their diagnostic value. Therefore, objectively determining the predictive value of these tests in identifying the precise anatomical source for disability—subacromial, intraarticular or other—is essential in order to proceed with further imaging evaluations for final objective diagnoses. Using validated clusters of provocative tests should improve their diagnostic values.