bluuebunny/crossref_metadata_2025 huggingface dataset:
Evaluasi Kesesuaian Perairan sebagai Kawasan Budidaya Kappaphycus alvarezii Doty 1985 (Florideophyceae : Solieriaceae), di Kecamatan Jepara
Authors: Turnip Sarah Pebriyani , Djunaedi Ali , Sunaryo Sunaryo
Published: September 2021

Rumput laut merupakan salah satu komoditas utama dalam budidaya perikanan yang dapat di budidayakan secara masal sehingga dapat dikatakan merupakan komoditas yang strategis. Karakteristik perairan secara fisika dan kimia Perairan Jepara memiliki potensi untuk pengembangan budidaya rumput laut. Namun di Kabupaten Jepara hanya Pantai Karimunjawa yang dimanfaatkan menjadi kawasan budidaya rumput laut. Penelitian ini bertujuan untuk mengetahui tingkat kesesuaian perairan berdasarkan kualitas air untuk kawasan budidaya rumput laut (K. alvarezii) di perairan Kecamatan Jepara yang terkait parameter fisika dan kimia. Penelitian ini merupakan jenis penelitian deskriptif dengan metode survei pengamatan langsung pada bulan Januari-Februari 2021 di 3 lokasi (stasiun) yaitu Pantai Kartini, Pantai Prawean dan Pantai Bandengan. Analisis Kesesuaian perairan menggunakan metode pembobotan (scoring). Hasil evaluasi dari skoring penilaian kesesuaian perairan di Perairan Kecamatan Jepara menunjukkan bahwa Pantai Kartini, Prawean dan Bandengan sesuai untuk dijadikan kawasan budidaya rumput laut (K. alvarezii). Seaweed is one of the main commodities in aquaculture which can be cultivated en masse so that it can be said to be a strategic commodity. Physical and chemical characteristics of the waters in Jepara waters have the potential for the development of seaweed cultivation. However, in Jepara Regency, only Karimunjawa Beach is used as a seaweed cultivation area. This study aims to determine the level of water suitability based on water quality for the cultivation of seaweed (K. alvarezii) in the waters of Jepara District which are related to physical and chemical parameters. This research is a descriptive type of research with direct survey methods in January-February 2021 in 3 stations, namely Kartini Beach, Prawean Beach and Bandengan Beach. Water suitability analysis uses the scoring method. The results of the evaluation of the assessment of the suitability of waters in the waters of Jepara District show that Kartini, Prawean and Bandengan Beaches are suitable to be used as seaweed cultivation areas (K. alvarezii).
Karakteristik Krim Tabir Surya dari Kappaphycus alvarezii Doty 1985 (Florideophyceae : Solieriaceae)
Authors: Beladini Septi , Susanto A.B. , Ridlo Ali
Published: September 2021

Paparan sinar ultraviolet yang terus menerus dapat menyebabkan kerusakan pada kulit. Upaya pencegahan dapat dengan menggunakan sediaan krim tabir surya. Rumput laut K. alvarezii adalah salah satu organisme laut yang diduga mengandung senyawa yang dapat dijadikan sebagai agen tabir surya alami. Tujuan dari penelitian ini adalah mengetahui karakteristik krim tabir surya dari ekstrak K. alvarezii. Sampel yang digunakan pada penelitian ini adalah rumput laut K. alvarezii kering yang diperoleh dari PT. Rumah Rumput Laut, Bogor. Rumput laut K. alvarezii diekstraksi dengan pelarut yaitu n-heksana, etil asetat, metanol Krim tabir surya dibuat menurut Mishara, (2018), dengan menambahkan empat ekstrak rumput laut K. alvarezii yang berbeda, kemudian dilakukannya uji yang meliputi uji organoleptik, uji stabilitas, uji tipe emulsi, uji clycling test, uji nilai pH, uji nilai SPF,. Hasil penelitian menunjukkan keempat ekstrak K. alvarezii memiliki serapan panjang gelombang pada daerah ultraviolet, untuk hasil analisis sediaan krim tabir surya menunjukkan krim tabir surya dari ekstrak K. alvarezii stabil secara fisik selama penyimpanan 28 hari, tidak ada perubahan warna dan bau, tidak terdapat pertumbuhan jamur, tipe emulsi  krim minyak dalam air dan memiliki nilai SPF >15 sehingga termasuk dalam kategori tabir surya ultra  Continuous exposure to ultraviolet rays can cause damage to the skin. Prevention efforts can use sunscreen cream preparations.seaweed K. alvarezii is a marine organism that is thought to contain compounds that can be used as natural sunscreen agents. The purpose of this study was to determine the characteristics of the sunscreen cream fromextract K. alvarezii. The sample used in this study was theseaweed K. alvarezii driedobtained from PT. Seaweed House, Bogor.seaweed was K. alvarezii extracted with solvents, namely n-hexane, ethyl acetate, methanol and distilled water. Sunscreen cream made, by adding four seaweed extract K. alvarezii different, then do a test covering the organoleptic test, stability test, test emulsion type,test clyclingtest, test the pH value, test the SPF value, . The results showed that the four extracts of K. alvarezii had wavelength absorption in the ultraviolet area, for the analysis of sunscreen cream preparations showed that the sun cream fromextract K. alvarezii was physically stable during 28 days of storage, no change in color and odor, no growth. fungus, a type of oil-in-water cream emulsion and has an SPF value of> 15 so it is included in the ultra sunscreen category.
NPR2 gene variants in familial short stature: a single-center study
Authors: Yuan Ke , Chen Jiao , Chen Qingqing , Chen Hong , Zhu Jianfang , Fang Yanlan , Wang Chunlin
Published: September 2021

Objectives

NPR2 variants are associated with various short stature and bone dysplasia, such as acromesomelic dysplasia Maroteaux tyoe, individuals with a phenotype similar to Léri–Weill syndrome (LWD), and idiopathic short stature (ISS). However, few studies have reported on the relationship between familial short stature (FSS) and NPR2 variants. This study aimed to explore the relationship between FSS and NPR2 variants through the detection and identification of NPR2 variants in children with FSS, phenotypic description, clear treatment plan, and follow-up of treatment effect.

Methods

Children who met the FSS diagnostic criteria and had informed consent were included in the study. The trio whole-exome sequencing method (trio-WES) was used to detect and evaluate the NPR2 variants.

Results

A total of 16 children with short stature were included in this study (pretreatment height ≤ −2 standard deviation (SD) in both the patient and the shorter parent, unknown genetic etiology). NPR2 variants were identified in 12.5%(2/16) of the participants. Patient A was a 6-year-old male and 103.7 cm tall (−3.11SD), while Patient B was a 9-year-old female and 123.2 cm tall (−1.88SD). However, their heights increased after recombinant human growth hormone (rhGH) treatment. The height of patient A increased by 0.36SD six months after treatment while that of patient B increased by 1.22SD after one and a half years of treatment.

Conclusions

NPR2 variant causes FSS. The growth rate of children significantly improved after rhGH treatment. However, further follow-up study is needed to determine the final height after long-term treatment.
The Immungenicity and Cross-Neutralizing Activity of Enterovirus 71 Vaccine Candidate Strains
Authors: Xiao Xia , Zhou Kangping , Gu Meirong , Li Guoshun , Li Yuan , Liao Yuyi , Zeng Peiyu , Yu Yebin , Xu Yingzhi , Zhang Gaimei , Xiao Haifeng , Cai Kun , Xu Junqiang , Zhang Jikai , Liu Jiankai
Published: September 2021

Objective:

This study aimed to evaluate enterovirus 71 (EV-A71) vaccine candidate strains, including their genotypes, immunogenicity and cross-neutralization capacity.

Methods:

From clinical samples, EV-A71 strains were separated by using Vero cells. Six strains were chosen for vaccine candidates, and the sequences were analyzed. To detect the immunogenicity of the strains, we used them to immunize NIH mice at 0 and 14 days. Cytopathic effects (CPE) were examined to determine the EV-A71 neutralizing antibody (NTAb) titer 14 d after the first and second inoculations. To evaluate the cross-neutralizing capacity of the EV-A71 vaccine candidate strains, we tested serum immunized mice with ten EV-A71 genotype strains.

Results:

Six EV-A71 vaccine candidate strains were identified, all belonging to sub-genotype C4, the prevalent genotype in China. The sequence similarity of the VP1 regions of the six candidate vaccine strains and three approved inactivated vaccines was 97.58%–97.77%, and the VP1 amino acid similarity was 98.65%–99.33%. Experiments were performed to evaluate the immunogenicity and cross-neutralizing activity of the EV-A71 vaccine candidate strains. The strains had good immunogenicity 14 d after two immunizations, inducing an NTAb titer ranging from 1:94 to 1:346. The NTAb seroconversion rates 14 d after one immunization were above 80% (except HB0007), and significantly increased immunogenicity of EV-A71 strains was observed post-inoculation. Furthermore, our candidate vaccine strains had broad cross-neutralizing activity after challenge with ten sub-genotypes of EV-A71. The highest NTAb titer/lowest NTAb titer ratios of sera against EV-A71 sub-genotypes were 8.0 (JS0002), 8.0 (JS0005), 21.3 (HB0005), 21.3 (HB0007), 10.7 (HB0040) and 8.0 (GD0002), respectively.

Conclusions:

Our EV-A71 strains had good immunogenicity and cross-neutralization activity, and have the potential to serve as vaccine strains for multivalent hand, foot and mouth disease vaccines.
Adsorption of azo dye Congo red on the Sn-doped TiO2 surface
Authors: Mironyuk I. , Myslin M. , Lapchuk I. , Tatarchuk T. , Olkhovyy O.
Published: September 2021

In this paper, the effect of SnO2 impurity on the surface charge and adsorption properties of TiO2 samples is investigated. The experimental value of the zero charge point for TiO2 with 3%, 6% and 12% of SnO2 equals 3.53, 3.97 and 3.2, respectively. The adsorption activity of the samples was studied on model solutions of the anionic dye – Congo red. The maximum adsorption capacity (qexp) equals 24.6 mg/g for 3Sn/TiO2, 25.0 mg/g for 6Sn/TiO2 and 39.1 mg/g for 12Sn/TiO2. Langmuir, Freundlich, and Dubinin-Radushkevich models were used to describe the adsorption mechanism of Congo red dye on the surface of Sn/TiO2 samples. Based on the results of the studies of Congo red adsorption by the surface of titanium dioxide doped with Sn, all samples agree best with the Langmuir model. The correlation coefficients for the Langmuir isotherms are in the range of 0.9927 - 0.9996, while the values ​​of R2 for the Freundlich and Dubinin-Radushkevich isotherms are in the range of 0.721 - 0.8329 and 0.8283 - 0.9433, respectively. Experimental data obtained from adsorption isotherms show that the TiO2 sample containing 12% SnO2 is the most active. The best result of Congo red removal occurred at a concentration of Co = 5 mg/l (% of removed dye ≈ 83% for 12Sn/TiO2; 81% for 6Sn/TiO2 and 71% for 3Sn/TiO2). Therefore, the studied samples of TiO2 doped with SnO2 can be used as effective adsorbents of Congo red from aqueous solutions.
First-Principles Calculations of Stable Geometric Configuration and Thermodynamic Parameters of Cadmium Sulfide Thin-Film Condensates
Authors: Oleksyn Z. , Naidych B. , Chernikova O. , Glowa L. , Ogorodnik Y. , Solovyov M. , Vashchynskyi V. , Yavorskyi R. , Il’chuk G.
Published: September 2021

Thin-film CdS layers obtained by the open evaporation method in vacuum are considered and cluster models for calculation of crystal, band structure and thermodynamic parameters are proposed. The thermodynamic parameters of the formation energy ΔE, enthalpy of formation ΔH, Gibbs energy ΔG, entropy ΔS and specific heat capacities at constant pressure and volume for cubic and hexagonal crystallographic modifications are determined. The stable crystal structure for cadmium sulfide was determined from the analysis of Gibbs energy temperature dependences for the sphalerite and wurtzine phases.
Synthesis, crystal structure and physical properties of the TbCo4.5SixLi0.5-x solid solution
Authors: Stetskiv I. , Kordan V. , Tarasiuk I. , Pavlyuk V.
Published: September 2021

Alloys from the region of existence of the solid solution TbCo4.5SixLi0.5-x were synthesized by arc melting. Quantitative and qualitative composition of alloys and powders of electrode materials was determined by scanning electron microscopy and energy-dispersive X-ray spectroscopy. The Tb/Co/Si ratio in the samples was confirmed by X-ray fluorescence spectroscopy. The change in cell parameters within the solid solution existence was established by the results of X-ray powder diffraction (TbCo4.5SixLi0.5-x, x = 0.1–0.4: a = 4.9518(5) – 4.9324(3), c = 3.9727(4) – 3.9746(3) Å). The crystal structure of the solid solution was determined by the Rietveld method (CaCu5 structure type, space group P6/mmm). Cobalt atoms are partially replaced by silicon and lithium only in 2c position. The ability of alloys to reversibly absorb hydrogen was studied by the method of electrochemical hydrogenation. Under experimental conditions the amount of deintercalated hydrogen was about 0.19 H/f.u. The change in cell parameters after hydrogenation (volume increases from 83.74(1) to 85.54(6) Å3) and the stability of the electrode in the electrolyte solution was further confirmed by X-ray phase analysis. Measurements of the electrical resistivity of the samples indicated a decrease of resistivity value with a slight increase in the amount of alkali metal in samples.
A Review of the some aspects for the development of ZnO based photocatalysts for a variety of applications
Authors: Baibara O.E. , Radchenko M.V. , Karpyna V.A. , Ievtushenko A.I.
Published: September 2021

Today, one of the most important problems for humanity is the pollution of the environment with various organic compounds that worsen the health of the peoples. The most dangerous pollutants are complex compounds that do not degrade under natural conditions. One way to solve the problem of pollution is to use photocatalysis to degrade harmful compounds. Zinc oxide nanostructures exhibit attractive photocatalytic and antibacterial properties due to the increased reactivity of the nanoparticle surface, which allows the efficient decomposition of organic pollutants. In this review, various methods for enhancing the photoefficiency of ZnO nanostructures are considered. It is shown that ZnO nanoparticles with specific surfaces (spherical, nanowires, nanoflowers), which are characterized by a high surface area, have a high removal rate of various pollutants. Such methods of improving the photocatalytic properties of ZnO as the band gap engineering, doping with metal/nonmetal, the combination of  ZnO with other materials, formation of hybrid structures are considered.
Thermal strength of retention compartment interacting with exhaust gas
Authors:   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine, Degtyarev M.A. , Akimov D.V. ,   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine, Bilous A.S. ,   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine, Avramov K.V. ,   A. N. Podgorny Institute for Mechanical Engineering Problems of the National Academy of Sciences of Ukraine, Kharkiv, Ukraine
Published: September 2021

The thermal strength of the retention compartment is calculated to analyze the possibility of multiple use for a rocket start. The transient heat field of the retention compartment, which is induced by the interaction of the exhaust gas with the retention compartment, is analyzed. The part of the retention compartment undergoes significant heat action with a high-temperature gradient when the rocket is started. This heat action essentially changes in time. This leads to the generation of significant transient stress fields. The aim of the present paper is the calculation of the maximal values of stresses induced by the heat field. We analyze the stress state induced by the steady-state heat field. This field corresponds to the transient heat field at the time when the maximal temperature gradient is observed. The upper bound of stresses in the retention compartment is obtained by the suggested method.
Performance of interface hoses for thermal conditioning system of "Cyclon-4" space rocket in extreme conditions
Authors:   Oles Honchar Dnipro National University, Dnipro, Ukraine, Khorolskyi M.S. , Bigun S.O. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine
Published: September 2021

This article contains the analysis of the performance of interface hoses for the thermal conditioning system of a Cyclone-4 space rocket in extreme operating conditions. thermal conditioning system interfaces with rubber hoses must ensure a tightness of a hose at a rocket’s inlet with easy detachment, involving little to no force impact on the rocket during its start on its one end, and rigid connection with a pipeline of the thermal conditioning system ground part, ensuring the hose tightness and retaining after the launch of a rocket on its other end, under any abnormal operating conditions. As it is shown in the article, this goal is attained by inducing contact stresses on surfaces adjacent to the rubber hose, originating from a designed radial compressive stress and coarseness of the contact surfaces. At the same time, the detachable part is subjected to lower radial deformation than the fixed one. To prevent any operating pressure excess in the thermal conditioning system ground part that might lead to extreme operating conditions, the retaining and release mechanism has been designed in such a way that under the operating conditions of pressing the hose’s sealing part, a proper stable gap would be ensured between the external radius of the rocket’s inlet protrusion and the internal diameter of its rim, so that the hose's sealing part could act as a safety valve. In such case, upon an excess of the permissible operating pressure, the hose’s sealing part would protrude through the gap mentioned by expanding and getting thinner, thus leading to detachment of the hose from the rocket’s inlet in the course of its launch or launch abort. In case of the retaining and release mechanism’s pin failure, the thermal conditioning system interface design would ensure the guaranteed failsafe detachment of the thermal conditioning system hoses with minimum stress on both the rocket and the thermal conditioning system ground part. As in a case of a critical pressure excess in the thermal conditioning system, the hose’s sealing part would act as a safety valve thanks to its axial extension under stresses from the rocket’s launch, the transportation and erection installation’s boom movement, or both factors at the same time. The hose’s sealing part, having a smaller cross-section in the area of the groove for retaining and release mechanism, would shrink in thickness during stretching and expand through the gap between the outer diameter of the rocket’s inlet protrusion and the internal diameter of the retaining and release mechanism’s rim, which was proven experimentally on a special test bench simulating operating conditions close to the real ones. At the same time, the stresses of the hose detachment from the rocket’s inlet are less than the hose’s rupture stresses in the axial direction by several orders during stretching.
Optimal damping of deviations of angular speeds of an eightsymetric space aircraft
Authors:   National Technical University of Ukraine ", Stenin А.A. ,   Kyiv Polytechnic Institute named after Igor Sikorsky",   , Kyiv, Ukraine, Pasko V.P. ,   National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky", Kyiv, Ukraine, Drozdovych I.G. ,   National Technical University of Ukraine "Kyiv Polytechnic Institute named after Igor Sikorsky", Kyiv, Ukraine, Soldatova M.O. ,   Institute of Telecommunications and Global Information Space of the National Academy of Sciences of Ukraine, Kyiv, Ukraine
Published: September 2021

This paper considers the problem of optimal fuel consumption damping of sudden deviations of angular velocities of an axisymmetric spacecraft with a constant speed of rotation around the main axis of symmetry. This assumption has some practical significance and may be due to the creation of artificial gravity on the spacecraft. The idea of artificial gravity due to the rotation of an axisymmetric cylindrical spacecraft is based on the principle of equivalence of the force of gravity and the force of inertia. The urgency of the fuel consumption optimization problem is due to the presence of its limited stock onboard the spacecraft. The optimization problem is solved based on the maximum principle and the phase plane method. The authors of the article determine the structure of optimal fuel consumption processes with three levels of control, and the number of their switches depends on the initial conditions. Synthesized on the phase plane, the optimal switching curves divide the phase plane into eight curvilinear quadrants, which uniquely determine the values of the optimal control effects by the current values of the deviations of the angular velocities of the spacecraft. The problem of the possible presence of a delay in the control loop is proposed to be solved based on the Bess compensation method. To do this, the corresponding optimal curves of switching and disabling the controls are built as geometric locations of points remoted for the time of delay from the found curves of switching and the beginning of coordinates accordingly. It allows us to avoid the emergence of steady self-oscillations in a control contour and to provide a condition of keeping the spacecraft in a given final state after the completion of the stabilization process. Depending on the technical equipment of the spacecraft, two variants of the optimal damping algorithm are offered, namely: an autonomous device in the onboard control system of the spacecraft in the absence of a sufficiently powerful onboard computer, or the optimal damping algorithm, implemented entirely in the onboard computer of the spacecraft in case of its sufficient power.
Tte stage deorbiting with a deceleration pulse detonation engine
Authors:   Oles Honchar Dnipro National University, Dnipro, Ukraine, Zolotko O.E. , Zolotko O.V. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine, Sosnovska O.V. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine, Aksyonov O.S. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine, Savchenko I.S. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine
Published: September 2021

The article discusses the issues related to reducing the amount of space debris from rocket stages. The main ways to remove the separable part of a rocket from a space orbit are: the usе of a deceleration detonation propulsion system; gasification of fuel residues and the use of a gas-reactive deceleration pulse system; continuation of the work of the main propulsion system after the separation of stages; the use of a harpoon to capture the rocket stage and the use of sail for its further braking; the use of anti-missile or combat lasers to destroy a stage on the orbit followed by the stage fragments’ burning in the Earth’s atmosphere. To select the optimal method for removing from the orbit the separated part of a space rocket, the arithmetic progression method was applied. It has certain advantages over the classical hierarchy analysis method and has no inherent disadvantages of this method. A ranked row of solutions was obtained according to the five most significant performance criteria, and its stability was proved. A new deceleration detonation propulsion design scheme is proposed. Detonation burning of residual fuel components provides the maximum possible value of the deceleration thrust impulse. Using the example of the second stage of the “Zenit” launch vehicle, we analyzed the nature of the dependence of the entry angle into the atmosphere on the important characteristic parameters: the deceleration speed impulse, the entry speed into the Earth’s atmosphere of the separated launch vehicle stage, the required value of the specific thrust impulse of the deceleration propulsion system. A new analytical formula has been obtained, which connects the thrust and specific thrust impulse values of the detonation engine with the determined detonation process parameters. The results of the computational experiment were compared with the results of calculating the specific thrust impulse using the new formula for oxygen-based fuel compositions, known experimental data, and numerical simulation data of other authors. The data obtained in this study make it possible to evaluate the design parameters of the deceleration detonation engine at the stage of analyzing technical proposals.
Automatized recognition of urban vegetation and water bodies by Jilin-1А satellite images
Authors:   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine, Makarov A.L. , Belousov K.G. ,   Yuzhnoye State Design Office, Dnipro, Ukraine, Svinarenko D.N. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine, Khoroshylov V.S. ,   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine, Mozgovoy D.K. ,   Oles Honchar Dnipro National University, Dnipro, Ukraine, Popel V.M. ,   Yangel Yuzhnoye State Design Office, Dnipro, Ukraine
Published: September 2021

The results of testing the developed techniques for automatized recognition of vegetation and water bodies on the urban territory by multispectral images from the Jilin-1А satellite are given.The research included automatized recognition of vegetation and water bodies on the selected observation territory based on images with super high spatial resolution in the visual and infrared range and consequent comparison of the obtained results with the results of visual decoding. The obtained results of processing the images from the Jilin-1А satellite in accordance with the proposed techniques confirmed the sufficiently high accuracy of automatized edge enhancement of recognized objects as compared to the results of interactive visual recognition of these images. Different test areas provided a good separation of vegetation and water types with the same thresholding customization. The accuracy of automatized classification of vegetation and water bodies (without considering the standard errors) for different test areas was within 81...92%, and values of kappa-coefficient were within 0.68 to 0.85. Comparison of normalized index images received from Jilin-1А and Sentinel-2A satellites showed slight discordance in NDVI values and significant discordances for NDWI and MNDWI that are caused by the usage of different spectral channels (SWIR and NIR). These discordances can be sufficiently reduced when using correction coefficients.Analysis of the influence of output image resolution reduction (from 10 to 8 bit) and subsequent informational compressing (JPEG lossy and JPEG2000 lossless) on results of automatized recognition of vegetation and water bodies confirmed the validity and efficiency of these techniques. The volume of saved and transmitted files significantly decreased (in 80…100 times) with a slight reduction of classification accuracy (by 1...2 %). The proposed techniques make it possible to increase significantly the efficiency and probability of renewing maps of big cities and to reduce financial expenditures as compared to the traditional ground GPS-surveying and aerosurveying. The high-level automatization of image processing and minimization of necessary calculations (as compared to techniques that use complex classifiers and neural networks) allow to implement the developed technique as a geographic information web service that satisfies the needs of a wide circle of government services and commercial structures and can be useful for megalopolis population and tourists.
Creating a microgreen growing environment at the space station
Authors:   Al- Farabi Kazakh National University, Almaty, Kazakhstan, Japashov N.M. ,   Nazarbayev Intellectual School of Chemistry and Biology, Almaty, Kazakhstan, Mansurova A.A. ,   Al- Farabi Kazakh National University, Almaty, Kazakhstan; Nazarbayev Intellectual School of Physics and Mathematics, Almaty, Kazakhstan, Balta N. ,   Suleymen Demirel University, Almaty, Kazakhstan
Published: September 2021

Plants are essential types of human nutrition, both in terrestrial and in space station conditions. The cultivation of plant foods in space conditions at the near-Earth stations has become possible due to the modern achievements in agricultural technologies. The proposed article aims to study the creation of optimal conditions for growing plants used in human nutrition in the space stations. In the work, a selection of plants and soil types for space station conditions was made. For this purpose, a three-stage experiment was carried out. In the first experiment, an experimental method was exploited to select the types of plants that are most suitable for growing under extreme conditions. The composition and structure of the soil were determined experimentally. It is shown that hydrogel can be used to accumulate water in space station conditions and can be a suitable medium for growing plants. Studies have shown that just hydrogel (without any nutrient mixtures) can promote plant growth. At the second stage of research, plants were successfully grown on the mixture of the hydrogel and the soil. In the third experiment, the authors added biostimulants and organic products to the hydrogel, and as a result, there was an increase in the speed and stability of plant growth. The experimental prototype of the container for growing plants in space conditions, which was tested in the above experiments, created by the authors, is shown.
The contribution of Kharkiv enterprises to the rocket and space industry development
Authors:   National Technical University ", Larin A.A. ,   Kharkiv Polytechnic Institute",   , Kharkiv, Ukraine, Gutnyk M.V. ,   National Technical University "Kharkiv Polytechnic Institute", Kharkiv, Ukraine, Tkachenko S.S. ,   National Technical University "Kharkiv Polytechnic Institute", Kharkiv, Ukraine, Horielova S.O. ,   National Technical University "Kharkiv Polytechnic Institute", Kharkiv, Ukraine
Published: September 2021

The article reviews the contribution of Ukrainian enterprises to the development of the rocket and space industry. The most important part of a space or combat ballistic missile is the control system (CS), on which the success of its application depends. Kharkov (Kharkiv) enterprises – the “Kommunar” plant and the Design Bureau “Electropriborostroenia” (SDB-692, now the RPA “Khartron”) were the largest manufacturers of control systems not only in Ukraine but throughout the Soviet Union. These systems were not only produced serially but also developed at these enterprises. The formation and development of Kharkov enterprises of the space industry is the most important page in the history of the development of not only cosmonautics but also science and technology. Despite the large number of works devoted to the development of rocket and space technology in Ukraine, the history of the development and production of control systems has not been sufficiently studied. Due to the secrecy of work in the field of rocket and space technology (RST), there are very few sources for studying the history of its creation. Therefore, the most important part of the work was interviewing the leading experts of SDB-692 in the field of the rocket and spacecraft control systems, which included A. M. Kalnoguz, Yu. A. Kuznetsov, V. Ya. Makarenko, V. G. Sukhorebrov and V. A. Uralov. Based on these interviews, a special fund was created in the Central State Scientific and Technical Archive of Ukraine. Control systems for many combat ballistic missiles, including P-7, P-7A, P-12, P-16, as well as the most powerful missile in the world P-36M2, which was named in the USA “Satana” (SS-18 “Satan”), “Proton”, “Zenith”, “Energia”, and “Cyclone” launch vehicles, “Kvant”, “Kvant-2”, “Crystal”, “Priroda”, “Spectrum” orbital modules, more than 150 satellites of the “Cosmos” series, and other objects were developed and serially produced at Kharkov enterprises. In the 1970s, SDB-692 created the USSR’s first onboard digital electronic computer. On its basis, a test and launch complex “Electronic launch” was developed, designed for pre-launch testing of control systems for ballistic missiles and launch vehicles.
INFLUENCE OF DILUENTS AND PLASTICIZERS ON THE PROPERTIES OF EPOXY-POLYSULFIDE COMPOSITES
Authors:   Ukrainian State University of Chemical Technology, Gagarin Avenue, 8, Dnipro, Ukraine, 49005, SUKHYY K.M. , NOSOVA A.N. ,   Ukrainian State University of Chemical Technology, Gagarin Avenue, 8, Dnipro, Ukraine, 49005, BELYANOVSKAYA O.A. ,   Ukrainian State University of Chemical Technology, Gagarin Avenue, 8, Dnipro, Ukraine, 49005, SUKHA I.V. ,   Ukrainian State University of Chemical Technology, Gagarin Avenue, 8, Dnipro, Ukraine, 49005, YIQI WU ,   Harbin Institute of Technology, Harbin, People’s Republic of China, KOCHERHIN YU. ,   Harbin Institute of Technology, Harbin, People’s Republic of China, HRYHORENKO T. ,   Harbin Institute of Technology, Harbin, People’s Republic of China
Published: September 2021

It was found that to increase the adhesive and physicomechanical properties of compositions based on epoxy resin and polysulfide rubber (thiokol), cured without heat treatment, it is necessary to carry out a preliminary thioetherification reaction (PRTE) due to the interaction of rubber mercaptan groups and oxirane cycles of epoxy resin at elevated temperatures and then use the product of this reaction to cure at room temperature. Composite materials based on the products of the thioetherification reaction significantly surpass analogs based on mechanical mixtures of epoxy resin and thiokol in terms of cohesive and adhesive strength, deformation capacity, fracture work, and specific impact strength. It is shown that the introduction of both diluents and plasticizers into the products of the preliminary thioetherification reaction of epoxy resins and polysulfide rubbers leads to an increase in the parameters of tensile strength and deformation capacity. The greatest strengthening effect is achieved with the use of oligoesteracrylate MGF-9 and glycidyl ether of diethylene glycol DEG-1, the smallest - with the introduction of the plasticizer EDOS. It was found that the introduction of plasticizers promotes some increase in the adhesive strength, but much less in comparison with the cohesive strength. In this case, the adhesion and cohesive characteristics change antibatically. It has been shown by dynamic mechanical spectrometry that the presence of diluents and plasticizers in epoxy-polysulfide composites leads to a decrease in the temperatures of the maximum values of the tangent of the angle of mechanical losses, loss modulus, the initial and final sections of the transition of the material from the glassy to the highly elastic state, as well as the density of the chemical network in the epoxy matrix.
ANALYSIS OF THE INFLUENCE OF THE NATURE OF THE FILLER SURFACE ON THE PROPERTIES OF HYBRID ORGANIC-INORGANIC NANOCOMPOSITES BASED ON EPOXY OLIGOMER
Authors:   Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske sh, Kiev, 02160, Ukraine, MYSHAK V.D. , SEMINOG V.V. ,   Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske sh, Kiev, 02160, Ukraine, KOZAK N.V. ,   Institute of Macromolecular Chemistry NAS of Ukraine, 48, Kharkivske sh, Kiev, 02160, Ukraine
Published: September 2021

The aim of this work was to investigate the influence of the chemical nature of the filler surface on the properties of hybrid organo-inorganic nanocomposites based on epoxy oligomer ED-20 in the presence of nanoscale functional filler of inorganic origin - aerosil, with different surface nature. The influence of the chemical nature of the surface of highly dispersed aerosil on the thermal properties of nanocomposites based on epoxy oligomer ED-20 has been studied. The peculiarities of the process of thermooxidative destruction have been studied. It is shown that the introduction of highly dispersed aerosil in the amount of 0.5% in the epoxy matrix does not lead to changes in the thermal properties of composites, and the nanofiller in the amount of 5% improves thermal stability of composites. The kinetics of the curing process of epoxy nanocomposites was studied by IR-spectroscopy. The influence of the presence of functional groups on the nanofiller surface on rate and the degree of conversion of epoxy groups was determined. The presence of hydroxyl groups on the surface of A-300 contributes to the rate of conversion of epoxy groups to a greater extent, compared with aerosil with a modified surface, which contains on the surface methyl groups capable of blocking reactive groups. It is established that the rate of conversion of epoxy groups in the presence of aerosil decreases in the range of ED-20 > ED-20 + A-300 > ED-20 + AM-300. The sorption properties of epoxy nanocomposites have been studied. It is established that the sorption process proceeds at a higher rate when the matrix is filled with unmodified aerosil. The mechanism of influence of the chemical nature of the filler surface and content on formation and properties of epoxy nanocomposites is discussed.
Sebészi megoldások krónikus multivisceralis arteriás elzáródások esetében
Authors: Dzsinich Csaba , Barta László , Bogdány Klaudia , Tóth Tamás , Pataki Tibor , Nagy Gabriella
Published: September 2021

Összefoglaló.
Bevezetés: A zsigeri artériák akut elzáródása fulmináns
klinikai képpel társul, és az esetek jelentős százalékában gyorsan halálhoz
vezet. Ha ezen artériák obliteratív folyamata lassan alakul ki, a zsigeri
artériák gazdag kollaterális kapacitása a klinikai tüneteket sokáig elfedi. Az
esetek egy részében az anatómiailag közel fekvő renalis artériák obliteratív
folyamata, illetve a társuló aortoiliacalis szűkületek és/vagy elzáródások
rendkívül szerteágazó klinikai képet okozhatnak. Az átfedések más hasi
betegségekkel félrevezetők lehetnek, emiatt késedelmes felismerésük súlyos
következményekkel járhat. Előfordulásuk nem gyakori, ismeretük azonban
nélkülözhetetlen mind a diagnosztika, mind a megoldás szempontjából.
Dolgozatunkban e bonyolult kórkép eseteit tárgyaljuk, és ismertetjük a
megoldások lehetőségeit.

Summary.
Introduction: Acute occlusions of the visceral arteries result
in fulminant clinical consequences and without fast and appropriate treatment
may lead to fatal outcome. If the obliterative disease has slow progression the
huge capacity of the collateral circulation of the visceral arteries may remain
free of symptoms at long run. By progression of the obliterative disease and
extension to both, the renal arteries and the aortoiliac segment the clinical
picture becomes more colourful. Symptoms mimicking other abdominal disorders may
easily lead to misdiagnosis and/or unnecessary delay of adequate treatment –
finally to organ or life threatening condition. In the present paper we deal
with this infrequent, but severe disease in order to recognize it in time, to
recommend proper diagnostic workup and propose adequate treatment.
Arrodált gyomorgyűrűk kezelése – irodalmi áttekintés egy eset kapcsán
Authors: Baranyai Zsolt , Merkel Keresztély , Horváth Miklós , Hritz István , Szijártó Attila
Published: September 2021

Összefoglaló.
Bevezetés: 70 éves férfi beteg kóros kövérség (BMI: 50,1) miatt
2005-ben gyomorgyűrű beültetésben részesült. 2020 decemberében hasfali phlegmone
hátterében igazolt port infekció miatt más intézetben subcutan incisió, lavage
történt. CT-vizsgálattal, majd gasztroszkóppal a gyomorgyűrű arrosióját,
intramurális elhelyezkedését igazoltuk. A műtét során laparoszkópos technikával
a gyomor corpus nagygörbületén ejtett, kb. 2 cm nagyságú nyíláson keresztül
távolítottuk el a gyűrűt. A beteg szövődménymentesen került emisszióra.
Megbeszélés: Mintegy 20 évvel ezelőtt a laparoszkópos
állítható gyomorgyűrű (LAGB) rendkívül népszerű volt. A LAGB azonban számtalan
rövid és hosszú távú szövődménnyel jár, ezért egyre inkább kikerül a bariátriai
sebészet tárházából. A gyűrű arrosiója ritka, súlyos szövődmény. Eltávolításának
többféle módja lehet. A gyomorgyűrű eltávolítása általában a testsúly jelentős
növekedésével jár. A betegeknél konverziós bariátriai műtétet, laparoszkópos
gyomor sleeve reszekciót, vagy gyomor bypass műtétet lehet végezni.

Summary.
Introduction: Extreme obese (BMI: 50.1) 70 year old male
patient after LAGB procedure in 2005, with abdominal wall and port infection
underwent subcutaneous incision drainage of the area in December 2020. CT and
Gastroscopy confirmed gastric penetration and intramural position of the Band.
Using laparoscopic approach with incision of 2 cm of the stomach at the gastric
greater curvature the band had been removed. Patient had been discharged without
any complications. Discussion: LAGB was a very popular
bariatric approach at the first decade of laparoscopic bariatric surgery. The
increased incidence of short and long term complications reduced worldwide the
number of LAGB procedures. Band penetration is a rare but dangerous
complication. Laparoscopic removal is recommended. Usually, the intervention is
followed by significant weight gain which can be treated with conversion of LAGB
to Sleeve Gastrectomy or LGBP procedure.
Petersen-hernia, egy ritka sérvtípus megjelenése osztályunkon
Authors: Merkel Keresztély , Vass Tímea , Herczeg György , Ágh Péter , Máté Miklós
Published: September 2021

Összefoglaló. 61 éves nőbeteg anamnéziséből 3 évvel korábbi, morbid
obezitás miatti bariátriai műtét (Roux Y gastric bypass, műtét előtti BMI 42,
aktuális BMI 22), hysterectomia, hypertonia említendő. Négy napja tartó diffúz
hasi fájdalom, hányás, hányinger, székletkimaradás miatt került SBO érintésével
sebészeti osztályunkra. Felvételkor mérsékelt hasi distenzió, diffúz felhasi
3-5/10 fájdalom volt, defensus nélkül, NG szonda jelentős tartalmat nem hozott.
Ileusra jellemző auscultációt, rectalis vizsgálattal üres ampullát találtunk.
Álló natív hasi felvételen jobb oldalon L II–III. csigolya mellett kissé gázos,
nem tágabb vékonybélkacs került leírásra, benne 2-3 cm-es nívóval. Hasi
UH-vizsgálaton folyadékkal telt, tág, 30–35 mm átmérőjű vékonybeleket írtak le.
CT-vizsgálat során a duodenum, jejunum és néhány proximalis ileumkacs kóros
distensióját igazolták, nívókkal, innen aboralisan összeesett vékonybeleket.

Tekintettel a kliniko-radiológiai képre, urgens műtét során Hasson-technikával
laparoszkópos inspekciót végeztünk, azonban a masszív ileus okozta térhiány
miatt kp medián laparotómiára konvertáltunk. Az exploráció során a
Petersen-hernián át a jobb hasfélbe herniálódott alimentáris, biliopancreatikus
és közös vékonybélszakaszt észleltünk a terminális ileum közepéig. A bél
életképesnek bizonyult. A Petersen-hernián át a kizáródott szakaszt a bal hasfél
felé visszahelyeztük, majd a Petersen-herniát nem felszívódó fonallal a colon
transversum és az alimentáris kacs mezentériuma közt tovafutó varrattal zártuk.
A beteg az ötödik postoperatív napon gyógyultan távozott.

Summary. 61 years old female with previous surgical history of
Roux-en-Y gastric bypass (3 years ago) and earlier hysterectomy admitted to our
surgical department with clinical and radiological signs of small intestinal
obstruction. Urgent intervention had been performed with following findings:
Petersen herniation of alimentary tract including the – biliopancreatic tract
and the small bowel extending to the midpart of the terminal ileum. Viability of
herniated intestinal tract had been confirmed, and reposition of herniated parts
through the Petersen hernia had been done. Closure with non-absorbable running
suture of the gap between the transverse colon and the mesenteriun of the
alimentary limb had been performed. Patient was fit for discharge on the fifth
postoperative day.
Associations between gaming disorder, parent-child relationship, parental supervision, and discipline styles: Findings from a school-based survey during the COVID-19 pandemic in Vietnam
Authors: Cuong Vu Manh , Assanangkornchai Sawitri , Wichaidit Wit , Minh Hanh Vu Thi , My Hanh Hoang Thi
Published: September 2021

Background and aims

Vietnam implemented numerous measures to reduce the transmission of COVID-19 among school students, including study-at-home/self-quarantine. During the study-at-home period, adolescents may engage in more video gaming than usual, potentially contributing to gaming disorder. However, the regionally-representative prevalence of gaming disorder and its association with parenting practice and discipline practice have not been described. We assessed the prevalence of gaming disorder among Vietnamese adolescents during the initial 6 months of the COVID-19 pandemic and the associations between gaming disorder and parenting practice and discipline practice.

Methods

We conducted a school-based, self-administered cross-sectional survey of 2,084 students in Hanoi, Vietnam (response rate = 97.1%). The survey included standardized instruments translated from English to Vietnamese. We performed multilevel logistic regressions to assess the associations between parenting practice, discipline practice, and gaming disorder.

Results

The prevalence of gaming disorder among the respondents was 11.6%. Healthy parent-child relationship was protective against gaming disorder (Adj OR = 0.36; 95% CI = 0.21, 0.62). Non-supervision, non-discipline, violent discipline were positively associated with gaming disorder.

Discussion and Conclusions

We found associations between gaming disorder and parent-child relationship, parental supervision, and parental discipline. Future interventional studies should consider assessing the effect of fostering healthy parent-child relationships and appropriate discipline on the occurrence or prognosis of gaming disorders.
Perfectionism predicts disordered eating and gambling via focused self-concept among those high in erroneous beliefs about their disordered behavior
Authors: Tabri Nassim , Werner Kaitlyn M. , Milyavskaya Marina , Wohl Michael J. A.
Published: September 2021

Background and aims

Perfectionism, a focused self-concept, and erroneous beliefs have been implicated in the development and maintenance of various disordered behaviors. However, researchers have yet to examine how these factors combine to explain different disordered behaviors. Herein, we addressed this gap and hypothesized a moderated-mediation model whereby perfectionism fosters the development of disordered behaviors through a focused self-concept. Critically, the effect of a focused self-concept on disordered behaviors is specific to people with erroneous beliefs about their disordered behaviors. The model was tested in the contexts of disordered gambling and disordered eating, particularly dietary restraint.

Method

In Study 1, participants were community members who gamble (N= 259). In Study 2, participants were university women (N= 219). In both studies, participants completed self-report measures of all constructs that are both reliable and valid.

Results

In Study 1, as expected, there was a positive association between perfectionism and disordered gambling, which was mediated by financially focused self-concept. This mediation was only observed among participants who scored high on illusion of control and belief in luck. Likewise, in Study 2, there was a positive association between perfectionism and dietary restraint, which was mediated by appearance focused self-concept. The mediation effect was only observed among participants who believed that maladaptive dietary restraint behaviors were safe and efficacious.

Discussion and Conclusions

The findings support the transdiagnostic utility of our model, which may help explain an array of disordered behaviors, including other addictive behaviors as well as behaviors that involve rigid adherence to rules and control.