bluuebunny/crossref_metadata_2025 huggingface dataset:
INVENTARISASI TUMBUHAN BERKHASIAT OBAT MENURUT MASYARAKAT LOKAL (ETHNOMEDICINE) DI WILAYAH BUKIT BESAR KHDTK PENDIDIKAN DAN PELATIHAN UNIVERSITAS LAMBUNG MANGKURAT
Authors: Novryanti Devy Ryas Ayu , Suyanto Suyanto , Asyari Mufidah
Published: April 2022

The potential spread of medicinal herbs is very necessary to be inventoried and conducted research. The purpose of this research is to identify the types of medicinal plants according to the local community in the Forest Area with Special Purpose Banjarbaru. The research method used is observation, inventory and interview with informants to identify medicinal plants in the research area. Informants numbered 4 informants from each nearby village. Data retrieval using the path method by purposive sampling as many as 4 paths representing the closure of natural forest and bushland. Observation of medicinal plants is carried out continuously sampling along the path. Total of the types of medicinal plants found in the research area of 1.4 Ha in natural forests there are 21 types of medicinal plants from 16 families and in shrubs as many as 10 species, from 10 different families. Based on the growth rate, obtained as many as 22 types of medicinal plants at all growth rates, including 9 types of seedling levels, 10 types of stake levels, 6 types of pole levels and 2 types of tree levels. The most consumed part to be used as medicine is the part of the leaves by drinking, whether it is through boiling, soaking, or squeezing.Potensi sebaran tumbuhan berkhasiat obat sangat perlu diinventarisasi dan dilakukan penelitian. Tujuan dilakukannya peneitian ini ialah mengidentifikasi jenis tumbuhan berkhasiat obat (Ethnomedicine) menurut masyarakat lokal di Kawasan Hutan Dengan Tujuan Khusus (KHDTK) Banjarbaru sebagai Hutan Pendidikan dan Pelatihan Universitas Lambung Mangkurat. Metode penelitian yang digunakan ialah observasi, inventarisasi dan wawancara dengan informan untuk mengidentifikasi tumbuhan obat di wilayah penelitian. Informan berjumlah 4 orang informan dari masing-masing desa terdekat. Pengambilan data menggunakan metode jalur dengan cara Purposive Sampling sebanyak 4 jalur yang mewakili penutupan lahan hutan alam dan semak belukar. Pengamatan tanaman obat dilakukan secara Continuous Sampling sepanjang jalur. Total dari jenis tumbuhan berkhasiat obat yang ditemukan  pada wilayah penelitian seluas 1,4 ha pada hutan alam ditemukan 21 jenis tumbuhan berkhasiat obat dari 16 famili dan pada semak belukar sebanyak 10 jenis, dari 10 famili yang berbeda. Berdasarkan tingkat pertumbuhannya,  didapatkan sebanyak 22 jenis tumbuhan obat pada semua tingkat pertumbuhan, diantaranya 9 tingkat semai, 10 tingkat pancang 6  untuk tingkat tiang dan 2 dengan tingkat pohon. Bagian yang paling banyak dikonsumsi untuk dijadikan obat ialah bagian daun dengan cara diminum, baik itu melalui perebusan, perendaman, maupun diperas
PEMANFAATAN LIMBAH SERBUK KAYU KARET (Hevea brasiliensis) DAN SERBUK PELEPAH KELAPA SAWIT (Elaeis guineensis) SEBAGAI BAHAN BAKU BIOPELET
Authors: Syamsudin Muhammad , Mahdie Muhammad Faisal , Sari Noor Mirad
Published: April 2022

Rubber wood waste from sawmills is in the form of powder which is still rarely used and usually for burning, in the sawmill industry the total waste is 50.8% of the raw material processed. Post-pruning oil palm fronds waste is also not widely used, where each hectare of oil palm plantations can produce as much as 486 tons of dry fronds and 17.1 tons of dry palm leaves / year. Based on these wastes, it can be used as raw material for biopelets. The quality of the biopellets produced from rubber wood sawdust combined with palm frond powder based on American standards (PFI), has obtained the recommended formulation, namely the ratio of 75% rubber wood powder powder and 25% rubber wood frond powder (Treatment B). With a density of 0.4909 g / cm3, a moisture content of 5.5625%, 77.7000% of flying substances, 11.6924% of bound carbon, 1.8100% of ash, and a calorific value of 4.067.63 cal / gLimbah kayu karet dari penggergajian berupa serbuk yang masih jarang dimanfaatkan dan biasanya untuk di bakar, pada industri penggergajian total limbah sebesar 50,8% dari bahan baku yang diolah. Limbah pelepah kelapa sawit pasca pruning juga belum banyak dimanfaatkan, yang setiap hektarnya kebun sawit dapat menghasilkan sebanyak 486 ton pelepah kering dan 17,1 ton daun sawit kering/tahun. Berdasarkan dari limbah-limbah tersebut sehingga dapat dimanfaatkan menjadi bahan baku biopelet. Kualitas biopelet yang dihasilkan dari serbuk kayu karet yang dipadukan serbuk pelepah kelapa sawit berdasarkan standar Amerika (PFI), telah diperoleh formulasi yang direkomendasikan yaitu pada perbandingan serbuk 75% serbuk kayu karet dan 25% serbuk pelepah kayu karet (Perlakuan B). Dengan kerapatan 0,4909 g/cm3, kadar air 5,5625 %, kadar zat terbang 77,7000%, karbon terikat 11,6924% kadar abu 1,8100%, dan nilai kalor 4.067,63 kal/g
PENGARUH NAUNGAN DAN PUPUK HAYATI MIKORIZA TERHADAP PERTUMBUHAN BIBIT BELANGERAN (Shorea balangeran)
Authors: Anindia Nur Laili , Achmad Basir , Nugroho Yusanto
Published: April 2022

The purpose of this study was to analyze the effect of mycorrhizal biofertilizer and shade on the growth of belangeran (Shorea balangeran) seedlings by measuring the height and diameter of the seedling, and calculating the survival percentage of seedlings. The method used was experimental quantitative with a completely randomized factorial design. The first factor was the level of shade which consisted of without shade, 50% shade and 75% shade. The second factor was mycorrhizae which consisted of without mycorrhizae, 2.5 gr, 5 gr, and 7 grper polybag. The results showed that the shade of 50% and the mycorrhizal dose of 5 gr separately affected very significantly and significantly the height increase of belangeran seedlings, with the average height of 27.073 cm and 25,111 cm, respectively. The interaction of shading and mycorrhizal factors had a significant effect on the increase in diameter of seedlings. The highest increase in the diameter of belangeran seedlings was in the treatment without shade with a dose of 5 g mycorrhizae, which was 0.340 cm. The shade and mycorrhizal doses proved that the survival percentage of seedlings were 100%, while in the treatment without shade and without mycorrhizae it was known from 12 seedlings planted, the number of 10 seedlings or 83% survivedPenelitian bertujuan untuk mengnalisis pengaruh pupuk hayati mikoriza dan naungan terhadap pertumbuhan bibit belangeran (Shorea balangeran) dengan mengukur tinggi dan diameter bibit serta menghitung presentase hidup bibit. Metode yang digunakan adalah kuantitatif eksprerimen dengan rancangan faktorial acak lengkap. Faktor pertama adalah tingkat naungan yang terdiri dari tanpa naungan, naungan 50% dan naungan 75%. Faktor kedua adalah mikoriza yang terdiri dari tanpa mikoriza, 2.5 gr, 5 gr, dan 7 gr er polibek. Hasil penelitian menunjukkan bahwa perlakuan naungan sebesar 50% dan dosis mikoriza 5 gr secara terpisah memberikan pengaruh sangat nyata dan nyata terhadap pertambahan tinggi bibit belangeran yaitu berturut-turut dengan rata-rata tinggi 27,073 cm dan 25.111 cm. Interaksi faktor naungan dan mikoriza berpengaruh nyata terhadap pertambahan diameter bibit belangeran. Pertambahan diameter bibit belangeran tertinggi yaitu pada perlakuan tanpa naungan dengan dosis mikoriza 5 g yaitu sebesar 0,340 cm, dan naungan dan dosis mikoriza membuktikan presentase hidup bibit adalah sebesar 100%, sedangkan pada perlakuan tanpa naungan dan tanpa mikoriza diketahui dari 12 bibit, yang berhasil bertahan hidup yaitu berjumlah 10 bibit atau 83% yang hidup
EFEKTIFITAS CUKA KAYU AKASIA (Acacia mangium Will) SEBAGAI BAHAN PENGAWET PADA KAYU DURIAN (Durio zibethinus Murr) TERHADAP SERANGAN RAYAP TANAH
Authors: Kimli Tommy , Ulfah Diana , Satriadi Trisnu
Published: April 2022

This study sight to examine the use of as a cast preservative, the appearance of the concentration and soaking time of Acacia’s wood vinegar toward beam weight reduction due to termite counterattack. Nowadays in the market, many uses of fruit wood were used as an alternative effort to overcome deficiencies of wood supply or availability. Most of these fruit woods has a low durability grade. With a low level of durability, the wood will be susceptible to pests such as wood destroyer termites. One of the fruit woods is Durian wood which has II-III durable classes. To increase its service life, Durian wood must be preserved. Acacia’s wood vinegar can be practicaled as a cast preservative to prevent dry wood termite attack. The average value of absorption and retention are influenced by the duration of the concentration and soaking time of Acacia’s wood vinegar. The longer soaking time and the higher concentration of Acacia’s wood vinegar, absorption and retention values were also high. This value affects the percentage of the degree of damage and weight loss of Durian wood. The higher the retention and absorption, reduce the percentage of damage and loss of weight. The need for further research on Acacia wood vinegar so that it can be used as a natural preservative against termite attacks on strange wood speciesPenelitian ini bertujuan untuk melihat pendayagunaan cuka dari kayu Akasia selaku bahan pengawet yang alami dan pengaruh lamanya perendaman dan konsentrasi dari cuka kayu Akasia terhadap pengurangan berat dari kayu oleh rayap. Sekarang ini di pasaran banyak digunakan kayu buah yang dijadikan pengganti untuk mengurangi berkurangnya kesediaan bahan baku atau simpanan kayu. Kayu buah-buahan ini banyak yang memiliki tingkat awet yang rendah. Tingkatan keterawetan yang rendah sangat sensitif terserang hama seperti rayap perusak kayu. Satu diantara jenis kayu buah-buahan adalah kayu Durian yang berada pada berat jenis di rata rata 0,57 hingga tergolong di kelas kuat II-III, untuk meningkatkan masa pakainya maka kayu Durian harus diawetkan. Cuka pada kayu Akasia dapat dipakai untuk menghindari atau mengurangi serangan rayap kayu kering sebagai bahan pengawet alami.  Nilai rata-rata absorbsi dan retensi kayu Durian dipengaruhi dengan lama perendaman kayu dan besarnya konsentrasi cuka kayu Akasia. Semakin lama waktu perendaman serta semakin tinggi konsentrasi cuka kayu Akasia maka nilai absorbsi dan retensi semakin tinggi. Nilai tersebut mempengaruhi besarnya persentase derajat kerusakan dan kehilangan berat kayu Durian. Semakin tinggi nilai absorbsi dan retensi maka persentase derajat kerusakan dan kehilangan berat cenderung menurun. Perlunya penelitian lebih lanjut mengenai cuka kayu Akasia sehingga dapat dimanfaatkan sebagai bahan pengawet alami terhadap serangan rayap pada jenis kayu lain
Evaluation of criteria to assist the selection of good quality grafted grapevines prior to their commercialisation
Authors: Carrere Camille , Spilmont Anne-Sophie , Loupit Grégoire , Beutin Philippe , Stessels Cédric , Ollat Nathalie , Cookson Sarah-Jane
Published: April 2022

The production of grafted grapevine plant material is a complex process with many steps running over at least one year, from grafting to final sorting in nurseries. To reach the market in France, grafted grapevines must meet three criteria by law: resistance to a manual graft union test (or thumb test), a minimum number of three roots and a woody, lignified stem which has grown from the bud of the scion wood of at least 2 cm long. This study aimed to evaluate the possibility of using visual criteria to select good quality grafted grapevines, without the need to do the thumb test because the thumb test is manual and therefore very subjective; the test depends on the strength applied by the person who realises it. This study was done on 22 scion/rootstock combinations with different degrees of grafting success, i.e., producing different proportions of marketable plants after one year in the nursery. The three legal criteria currently used to select marketable grafted grapevines in France as well as other external and measurable criteria such as the length of lignified stem and diameter, the number of thin and thick roots, and rootstock wood diameter were measured on the 22 scion/rootstock combinations. Variation in the values for these different criteria was observed and correlations between the criteria and the number of marketable plants were studied. This data was then analysed to determine which visible criteria contribute most to identifying marketable grafts. The percentage of marketable grafts was most strongly correlated with the thumb test and positively correlated with the length of the lignified stem. The variables with the highest predictive effect for identifying marketable plants (other than the thumb test) were the number of large roots and the length of the lignified stem. The possibility of using visible criteria to screen for good quality grafted plants is discussed, but no single, or combination of criteria, was sufficiently strongly correlated with the percentage of marketable plants to replace the thumb test.
Joao Alberto Meyer, né Hans Albert Meyer, connu comme Jean Meyer... Physicien
Authors: Meyer Bruno
Published: April 2022

Né en 1925, mon père, Hans Albert Meyer, a eu deux nationalités : Dantzigois de naissance, puis naturalisé brésilien. En quatre périodes distinctes, il aura vécu près de la moitié de ses 85 ans en France. Son histoire doit autant à la violence du XXème siècle qu’à ses qualités propres. Par son père, il était issu d’une famille juive installée à Dantzig depuis des générations. Cette ville germanophone de la Ligue Hanséatique faisait partie de la Prusse.  En 1919, le Traité de Versailles retira la ville à l’Allemagne pour en faire une cité-Etat - un statut qu’elle avait déjà connu dans son histoire - jusqu’à son invasion par Hitler le 1er septembre 1939, invasion qui marqua le début de la Seconde Guerre mondiale. Dantzig devint polonaise après la guerre, les chantiers navals de Gdansk jouant le rôle que l’on sait sur l’histoire de l’Europe, mais c’est là une autre histoire.
Nutritional quality of fermented feed for local chicken containing banana tree waste in Sidolego Village, Tabir Lintas District, Merangin Regency
Authors: Nurhayati Nurhayati , Berliana Berliana , Nelwida Nelwida , Depison Depison , Musnandar Endri , Handoko Heru , Alwi Yun , Muthalib Raden Abdul , Azis Abdul
Published: April 2022

Objective: This study aims to determine the nutritional quality of fermented feed containing banana plant waste that will be given to native chickens in Sidolego Village to accelerate the achievement of Sidolego Village as a chicken center village.

Methods: The ingredients used to make fermented feed were banana tree waste, black garlic, curcuma, maize, rice bran, fish meal, and coconut meal. All ingredients were ground into flour, mixed thoroughly, and fermented using a solution of Effective Microorganisms 4 (6ml EM4: 6gram sugar: 1-liter water). The study was designed into a completely randomized design with 4 treatments; length of fermentation (1, 2, 3, and 4 days) and 5 replications. The parameters were the nutrient content (dry matter, organic matter, crude protein, crude fiber, and crude fat) and metabolizable energy.

Results: The results showed that the fermentation time significantly affected (P<0.05) the nutrient content and energy of fermented feed. Fermentation for 3 days significantly decreased dry matter, crude fiber, nitrogen-free extract, and metabolizable energy. The fermentation period did not significantly affect organic matter and crude fat content, but it significantly increased crude protein content.

Conclusions: It was concluded that feed containing banana tree waste fermented using EM4 for 3 days had sufficient nutrients especially crude protein content (20%) and might be offered to the growing local chickens in Sidolego Village and meet their nutrient requirement. It is recommended that the results of this study be followed up on feeding to local chickens kept in Sidolego Village to know its effect on local chicken performance.

 
Maximizing Agency Theory in Integrated Reporting of Companies Listed in Kompas100 Index
Authors: Widhiastuti Ratieh , Harto Puji
Published: April 2022

This study aimed to examine the effect of the audit committee, independent commissioners and stakeholder pressure on integrated reporting either directly or moderated by profitability. The object of research was companies listed in Kompas100 index for three consecutive years from 2018-2020. The research sample was determined by using purposive sampling method, and obtained 231 units of analysis. The analysis tool used descriptive and moderated regression analysis. The results of the descriptive analysis showed that on average the number of audit committees and independent commissioners was ideal and according to the rules, institutional ownership was more than 50% of all companies in all industrial sectors. The test results showed that the audit committee and stakeholder pressure had a significant positive effect on integrated reporting, while the independent commissioner had a significant negative effect. Profitability was able to weaken the effect of the audit committee, strengthen the effect of independent commissioners, and was not able to moderate the effect of stakeholder pressure on integrated reporting. Suggestions from this study are to increase the number of audit committees and independent commissioners for the company indexed Kompas100 that does not meet the minimum standards, as a form of corporate responsibility and a form of company compliance with OJK rules.
Do Brand Development Touchpoints Influence Private Higher Education Institutions’ Brand Equity?
Authors: Nursito Sarwono
Published: April 2022

Privately-managed higher education institutions that play a notable role in the Indonesian higher education sector, in today's increasingly competitive environment, need to develop brand equity to secure the existence and ensure the institutions' sustainability. Therefore, this study aims to examine the effect of brand development at the pre-admission touchpoint, during the course touchpoint, and the post-passing touchpoint on the brand equity of private higher education institutions. This study involved 100 third-year students from two private higher education institutions in Klaten Regency and used the purposive sampling methode as the sampling technique. The collected data were then analyzed using multiple linear regression analysis. The results indicated that brand development at the pre-admissions touchpoint becamee the primary variable in determining the brand equity of the private higher education, followed by brand development at the course touchpoint and brand development at the post-passing touchpoint. In addition, brand development at the three touchpoints simultaneously had a positive and significant influence on the brand equity of private higher education institutions.
Determination of Steel Losses and Optimization of the Thickness of the Transformer Magnetic Conductor Sheets
Authors: Plotnikov S. M.
Published: April 2022

Currently, transformer manufacturers are tasked with creating energy-efficient devices with a reduction of steel losses of up to 44 %. Appropriate theoretical developments are needed for its implementation. With a reduction of eddy-current losses, caused, for example, by reduction of decrease in the thickness of the magnetic conductor sheets, hysteresis losses simultaneously increase. A similar effect is caused by changing the size of the crystal grain of steel, thermomagnetic treatment and other technological impacts. In this regard, the exact determination of the components of total losses in steel is an urgent problem, the solution of which would minimize total losses. The article analyzes the expressions that determine the specific losses for eddy currents and hysteresis through the parameters of the magnetic circuit, and states that this technique is too complicated for engineering calculations. Since eddy current losses are proportional to the square of the frequency, and hysteresis losses are proportional to the frequency in the first degree, simple calculated expressions of eddy current and hysteresis losses have been obtained using the wattmetric method. Based on the fact that the dependence of the magnetization loss on the thickness of the magnetic conductor plates is a decreasing linear function, and the eddy current loss is an ascending parabolic function, an expression of the optimal thickness of the plates has been found, the implementation of which makes the losses of steel minimal. This information will make it possible to minimize total steel losses more effectively by varying the design parameters and the material of the magnetic conductor. It is shown that the charted idling losses of transformers manufactured by different manufacturers differ by more than 30 % and can be rounded and underestimated; therefore it is advisable to obtain this parameter as a result of an experiment (idling experiment).
Investigation of Heat and Mass Transfer in the Processes of Heat Treatment and Drying of Thermal Insulation Materials
Authors: Ol’shanskii A. I. , Zhernosek S. V. , Gusarov A. M.
Published: April 2022

The results of the study of heat and mass transfer in the processes of heat treatment and drying processes of thermal insulating materials when the values of the Biot heat exchange criterion are less than one and the main factor is the interaction of the evaporation surface of the material with the environment (external problem) are presented. It was assumed that at low temperature gradients over the cross section of a wet body, thermal transfer of matter can be neglected, and phase transformations are absent (Posnov's criterion is equal to zero). By processing the experimental data on convective heat treatment of materials carried out by the least squares method, experimental equations for calculating the kinetics of drying have been obtained. Equations are given for determining the duration of drying, material temperature, heat flux density. On the basis of the theory of regular thermal regime, equations for the rate of heating of a solid and the rate of decrease in moisture content have been obtained. The verification of the reliability of the obtained equations and comparison of the calculated values of the parameters with the experimental ones are presented. An experimental dependence of the relative drying rate on the dimensionless moisture content has been established. The dependence of the generalized drying time on the relative moisture content is given. Also, based on the analysis of the experimental data on the thermal conductivity coefficients for wet thermal insulation materials, the dependences of the thermal conductivity coefficients on moisture content and temperature have been established. As a result of solving the criterion heat transfer equation, the values of the heat transfer coefficients for the period of the decreasing drying rate are obtained. The values of the Biot criterion in the processes of drying porous ceramics and asbestos are determined, too. It has been determined that the ratio of the moisture content loss rate to the drying rate in the first period does not depend on the drying mode and is a function of the initial moisture content.
Analysis of Illumination Generated by LED Matrices Distribution
Authors: Bogdan P. S. , Zaytseva E. G. , Baranov P. O. , Stepanenko A. I.
Published: April 2022

Сreation of indoor lighting systems with the possibility of changing its parameters in space and time is a promising direction within the framework of the intellectual environment system. The aim of this work was to create a methodology for calculating the illumination created by LED matrices which does not require the use of specialized software products and is adapted to the possibility of varying the parameters of LEDs and illuminated rooms.

The urgency of creating a room lighting system that simulates the conditions of natural lighting taking into account the need to change its spectral composition in time, in space taking into account the physical and psychological state of a person is substantiated. The possibility of using well-known computer programs to calculate the distribution of illumination in the room is analyzed.

A method has been developed for calculating the distribution of illumination on a plane using both a flat LED matrix and a matrix with an inclined arrangement of the planes of individual LEDs. It is shown that the distribution of illumination is a function of the indicatrix of the light intensity of the LED, its location in space, the number of LEDs in the matrix.

Illumination distribution has been calculated for various light sources consisting of RGB LEDs both for desktop and ceiling lighting was calculated. It is established that when using matrices containing the same LEDs distribution of illumination is very nonuniform. The inclined arrangement of LED planes slightly increases uniformity reducing the maximum illumination. For ceiling lighting the option of uniform distribution of LEDs within the ceiling plane provides more uniform illumination than when the same number of LEDs are arranged in groups of matrices.

Results of LED sources modeling indicate the need to modernize simple orthogonal matrices containing the same type of elements with the same power modes for all elements in order to increase the uniformity of illumination and efficiency. Such modernization can be carried out by changing the geometry of matrices differentiating the power modes of individual LEDs. The developed calculation program can be supplemented with options for introducing the above changes, as well as options for analyzing the spectral distribution of light in space.
Assessing of a Radiation Therapy Sessionʼs Duration at the Stage of Pre-Radiation Preparation
Authors: Piatkevich M. N. , Titovich E. V.
Published: April 2022

The treatment planning process includes a review of the radiation treatment plan which leads to a decision on the patientʼs treatment technique. The scope of this study was to create a mathematical model for calculating of a radiation therapy session duration during the pre-radiation planning stage.

For dosimetric planning of radiation treatment the authors provided a formula and an algorithm for determining of a patientʼs irradiation session duration. Radiation therapy session parameters such as radiation technique, number of monitor units, characteristics of radiotherapy equipment, number of radiation fields, radiation field parameters (angles of rotation of the radiotherapy coach, collimator, gantry), presence / absence of dose-modulating devices, dose rate, and duration of patient position verification procedures have all been taken into account during the development of software. The developed application explains how to define typical timing characteristics for various items as well as how to select a template from a built-in drop-down menu. If the dosimetric plan does not match for one of the templates, the program provides a space for defining of all parameters manually.

The anticipated deviations of the true indicators from the expected indicators of the duration of the radiation therapy session were assessed. A total of 300 cases have been completely measured, with 100 cases studied for each irradiation technique (IMRT, VMAT, 3D). The maximum detection confidence value for the 3DCRT irradiation technique is 2.3 %, while the deviation for the IMRT and VMAT irradiation techniques is less than 1 %. The magnitude and degree of the deviation of the measured value from the expected one for a variety of characteristics and features have been revealed to depend on the actions of the personnel.

The program developed allows medical physicists to analyze the timing parameters of the specified dosimetric planning methodologies directly on the treatment planning workstation. Evaluation of the duration of a radiation therapy session during the treatment planning stage, selection of various radiation treatment modalities, and consideration of the characteristics of the radiation session in each clinical case are available for analysis and further justified action.
Study of Strength Characteristics of Products Produced by 3D-Printing from PLA
Authors: Ermakova V. A. , Gasperovich E. V. , Ermakov A. I. , Litvyak V. V.
Published: April 2022

In modern mechanical engineering, along with reducing the metal consumption of structures, the main task is  to increase the reliability and durability of parts, assemblies of mechanisms. This problem never loses its relevance due 

to the ever-increasing requirements for manufacture of products, with the need to save scarce expensive metals and alloys and,  as a result, replace them with economically more profitable options. One of the most promising, from the point of view of ecology, ways to replace metals, is to use in the construction of plastic assemblies, in particular polylactic acid (PLA). PLA is a biodegradable thermoplastic used in 3D-printing. The paper presents results of an experimental study on the rupture of samples obtained by 3D-printing from PLA under various technological operating modes of 3D-printer. The following parameters have  been chosen as variable parameters: the form of filling samples (triangle, hexagon (honeycomb), line, edge), nozzle temperature (190–205 °С), sample filling factor (from 10 up to 40 %). Tensile testing of the samples have been carried out on a hydraulic tensile machine with a measuring software package in the Kason WDW-5 set. When performing tests, the conditional yield strength was considered the main out put indicator. The analysis of experimental data has shown a significant effect of the investigated technological parameters on the conventional yield point, which varied from 16.5 to  22.42 MPa. The most rational forms and sample filling factor, as well as the temperature of nozzle when printing with PLA, have been determined.
Behavioral Characteristics of Cement Concrete Pavements in South Kazakhstan: Climatic Changes and Optimal Construction Method
Authors: Sakanov D. , Saginov Z. , Mominova S. , Ussenkulov Z. , Kim Kwang Don
Published: April 2022

The present paper describes experiments and research outcomes concerning the construction of cement concrete pavements in South Kazakhstan, taking into account significant climate changes. The study has identified  potential problems in the construction of cement concrete pavements in the region, where there was no experience of their construction until  the mid-2000s. In order to develop an optimal solution, the technical factors that characterize the process of arranging these coatings using sliding molds are analyzed and quantitatively normalized. These factors include the optimal amount of mortar for curing concrete, the optimal joint cutting time, the interval and effective width of expansion joints to prevent the formation  of cracks in concrete at an early age. The effectiveness of the use of polyethylene film to prevent the formation of contraction cracks and maintain the required mode of hardening of the cement concrete pavement is shown. The main cause of damage  to the expansion joints along the length of the day coverage of coatings in the conditions of South Kazakhstan has been established. Recommendations have been developed for the installation of cement-concrete pavement and expansion joints during the construction of roads in this region. The accumulated data on climatic factors and methods of work with the use of polyethylene film have made it possible to create an optimal method for the construction of cement concrete pavements,  which will improve the quality of roads in South Kazakhstan.
Analysis of Development of Various Types of Urban Electric Transport in Polotsk and Novopolotsk
Authors: Kapskiy D. V. , Kuzmenko V. N. , Krasilnikava A. S. , Semchenkov S. S. , Kot E. N. , Larin O. N.
Published: April 2022

The paper considers options for reducing environmental losses in Polotsk and Novopolotsk through the development of trolleybus and tram systems – various types of urban electric transport. In order to reduce the costs of creating 

transport (including charging) infrastructure, as well as operating costs, the effectiveness of such systems has been determined when using not only classic types of transport, but also hybrid buses, electric buses, duo-buses. Approaches and methods have been developed to improve the quality of passenger service without deteriorating the environmental situation – this will  become possible thanks to the development of tram and trolleybus traffic in Polotsk and Novopolotsk. Variants of scenarios for the use of various types of urban eclectic transport in the cities under study are presented, which will reduce investment  in vehicles and the cost of creating an operational base at the expense of existing production facilities, for example, a tram fleet. In addition, this will make it possible to create and organize a unique agglomeration rail passenger system, which can become one of the ways to develop the tourist potential of Polotsk and Novopolotsk. The proposals outlined in the paper  are aimed at improving the environmental situation in these cities by reducing the volume of emissions of harmful substances by buses, especially on the central streets.
Statistical Analysis of Industrial Processes
Authors: Chepeleva T. I. , Chepelev A. N.
Published: April 2022

To analyze the synchronization of machine-building production processes, a statistical approach is used on the correctness of the choice of parameters. The accuracy of the parameters is achieved by modeling. This method allows checking how correctly the parameters are selected and whether they ensure uninterrupted operation of production. Statistical analysis of parameters gives information on failures in a particular production unit, on violations of the synchronization of production processes, technological processes. With the help of statistical characteristics, it is possible to evaluate production as a whole. Statistical multidimensional analysis of complex production data allows to analyze the work of individual units, production blocks. The cluster analysis has been carried out by the method of K-medium production process with minimization of the total error probability. A geometric interpretation of the results of cluster analysis of production processes is given in the paper. The influence of  factors on the work of production has been determined in the paper. The index factorial method with  a different comparison base and different weights has been applied. The hypothesis about the adequacy of the model of production processes has been tested. A statistical analysis of the complex data of the production process has been carried out  in the search for optimal solutions in the case of uncertainty and in conditions of risk using the following methods: Bayes, Laplace and Germeyer using the simplex method. The network methods of decision-making have been used in the paper.  Statistical methods  with the help of mathematical modeling have substantiated the optimal sizes of both individual parts  and volumes of local warehouses, so that there were no delays in the transfer of production processes, disruptions in work, downtime of working equipment. In this case, the criterion for the optimality of production volumes can be the minimum  of total losses from idle time of individual units and production blocks to the possibility of disruption of the synchronous  process modes due to lack of equipment (arising production pockets) or due to long-used outdated units.
Multi-Layers Composite Plasma Coatings Based on Oxide Ceramics and M-Croll
Authors: Panteleenko F. I. , Okovity V. A. , Devоino O. G. , Astashinsky V. M. , Switala F.
Published: April 2022

The paper considers the influence of the parameters of the plasma spraying process on the technological characteristics of multilayer coatings based on nickel-chromium, nickel-chromium-aluminum-yttrium materials, oxide ceramics,  intended for operation at high temperature and additional dynamic loads. The design of plasma coatings during their application (with subsequent high-energy processing) under such conditions requires a comprehensive solution – both the use  of high-quality powder ingredients and the optimization of technological parameters. The plasma process of applying powder materials has been improved to obtain the maximum values of their utilization factors. The technological characteristics that affect the properties of plasma coatings are optimized, namely: the flow rates of the plasma-forming and materials-transporting gases, the flow rate of  supplied powder materials, the current and voltage of the electric arc of the plasma torch, the distance from the plasma torch nozzle exit to the substrate. The paper presents the results of studies of the structure  of coatings, performed using scanning electron microscopy. Their analysis has made it possible to form general regularities obtained by the action of radiation of compression plasma flows on coatings formed by air plasma. The considered structures are created using the processes of melting, compaction and high-speed cooling of plasma coatings. The main optimization indicators are the maximum local compaction and spillage of the obtained compositions with the absence of defects and  destruction from the impact of compression plasma flows. The main effect during the action of radiation of a compression plasma flow on previously formed coatings is thermal. It contributes heating of the near-surface layer. When the coating  is exposed to radiation of compression plasma flows, a remelted layer of oxides with a thickness of about 12–15 µm is created, smoothing the relief of the formed surface and creating a network of cracks on the surface, diverging into the depth of the coating. The liquid-phase processes occurring in the molten phase of the near-surface layers after exposure to compression plasma radiation change the structure of the layers and contribute to the modification of their mechanical properties.  By smoothing the surface, increasing the density of the surface crystallized layer and  minimizing macro-defects – pores  or macrocracks – the mechanical characteristics of the coatings increase.
Liver cancer mortality in Mexico: trend analysis from 1998 to 2018
Authors: Álvarez Christian S , Espinosa-Tamez Priscilla , López-Ridaura Ruy , Lamadrid-Figueroa Héctor , Melchor-Ruan Javier , McGlynn Katherine A , Lajous Martín
Published: April 2022

Objective. To examine overall, sex, and state-specific liver cancer mortality trends in Mexico. Materials and meth­ods. Joinpoint regression was used to examine the trends in age-standardized mortality rates of liver cancer between 1998-2018. Estimated annual percent change with 95% confi­dence intervals (95%CI) were computed. Age-period-cohort models were used to assess the effects of age, calendar year, and birth cohort. Results. The state-specific mortality rates ranged from 3.34 (Aguascalientes) to 7.96 (Chiapas) per 100 000 person-years. Sex-specific rates were roughly equal, nationwide. Overall, we observed a statistically significant decrease in liver cancer mortality rates between 1998-2018 (annual percent change, -0.8%; 95%CI -1.0, -0.6). The overall age-period-cohort models suggest that birth cohort may be the most important factor driving the trends. Conclusions. While there was overall decline in liver cancer mortality, differences in rates by region were observed. The regional differences may inform future studies of liver cancer etiology across the country.
Asociación entre actividad física y calidad de vida: Encuesta Nacional de Salud
Authors: Saldías-Fernández M Angélica , Domínguez-Cancino Karen , Pinto-Galleguillos Daniela , Parra-Giordano Denisse
Published: April 2022

Objetivo. Analizar el efecto de la actividad física (AF) sobre la calidad de vida (CV) en personas de 15 años o más, consi­derando características sociodemográficas, epidemiológicas y psicosociales levantadas en una encuesta nacional. Material y métodos. Estudio cuantitativo-analítico-transversal de­sarrollado en Chile 2020, a partir de estadística descriptiva e inferencial. Resultados. Edad promedio de 49 años, 63% de sexo femenino. Un 15% informó practicar algún deporte o entrenar de manera intensa; 75% tiene una buena o muy buena CV y 53% buena o muy buena CV en salud. Quienes practi­caban algún deporte intenso tenían más posibilidad de tener una buena o muy buena CV (RM=1.58; IC95%= 1.28,1.96) y CV asociada a la salud (RM=1.67; IC95%= 1.40,1.99) en comparación con quienes no practicaban. Conclusiones. La AF es un aspecto que impacta positivamente en la CV de las personas y en la salud general de la población, además de que es económica y fácil de instaurar.
Parental obesity and the transition from teenagers of normal-weight to young adults with obesity in Mexico
Authors: Brambila-Paz Carlos , Hernández-Ángeles Domingo Faustino
Published: April 2022

Objective. To estimate to what extent the parental tran­sition to obesity affects the likelihood that normal-weight teenagers also transition to obesity. We depart from the hypothesis that the transition to obesity specifically among parents is the main factor affecting the development of obesity during adolescence. Materials and methods. Using two rounds of the longitudinal Mexican Family Life Survey (MxFLS) and logistic regressions, we investigated how family weight-related characteristics affected the likelihood of teenagers 13 to 18 years of age in 2002 of becoming affected by obesity after seven to ten years. Results. The results confirm that if any of the parents were affected by obesity during the teenage period, the adolescent is more likely to become affected by obesity. Conclusions. Results confirm that, different from childhood obesity, the transition of parents to obesity during the adolescence of teenagers is the most important family factor affecting such transition.
Association of high-risk human papillomavirus with ocular surface squamous neoplasia: a case-control study in Mexico
Authors: De La Parra-Colin Paola , Pichardo-Bahena Raúl , Méndez-Martínez Rocío , García-Carrancá Alejandro , Barrientos-Gutierrez Tonatiuh , Santamaría-Olmedo Mónica , Lazcano-Ponce Eduardo , Hidalgo-Bravo Alberto
Published: April 2022

Objective. To investigate the association of high-risk hu­man papilloma virus (HR-HPV) and other risk factors with ocular surface squamous cell neoplasia (OSSN). Materials and methods. We obtained DNA from 22 fresh frozen OSSN tissues and 22 pterygia as controls, we used a broad-spectrum HPV DNA amplification short PCR fragment to identify HPV infection in all specimens and then genotyped HPV by a reverse hybridization line probe assay. We also obtained demographic, sun exposure, and tobacco consump­tion information. Results. HR-HPV frequency was 40.9% in the OSSN group and 4.5% in the pterygia group (p=0.009). After covariate adjustment, OSSN was associated with HR-HPV (OR=16.3, 95%CI=1.2,218.1, p=0.03) and sunburn (OR=10.8, 95%CI=1.8,86.0, p=0.02). Conclusions. Ocular surface squamous cell neoplasia is a multifactorial disease. The strong association between HR-HPV and OSSN, suggests that HR-HPV could play an etiological role in OSSN development.
Riesgos de accidentes en el hogar: factores asociados y su efecto sobre la ocurrencia de accidentes en grupos vulnerables
Authors: Vera-López Juan Daniel , Hidalgo-Solórzano Elisa , Pérez-Núñez Ricardo
Published: April 2022

Objetivo. Estimar el nivel de exposición a riesgos de ac­cidentes en hogares vulnerables, identificando sus factores asociados y analizar su relación con la ocurrencia de acciden­tes en México. Material y métodos. Estudio transversal que analiza una submuestra de información del Secretariado Técnico del Consejo Nacional para la Prevención de Acci­dentes, recolectada durante 2016-2019. Se utilizó regresión Poisson para estimar factores asociados con el número de riesgos presentes en hogares donde residía población infantil (<5) y adulta mayor (75+) y regresión logística para analizar la ocurrencia de accidentes. Resultados. En hogares con <5 hubo en promedio seis riesgos; 2.9 donde residían 75+. La prevalencia de lesiones accidentales el año previo fue 3.1% (IC95%=2.0,4.6) en <1 año, 7.6% (IC95%=6.9,8.4) en 1-4 años y 17.1% (IC95%=15.6,18.7) en 75+. Las caídas fueron la principal causa. Conclusiones. Existe un elevado número de riesgos en hogares con población vulnerable; es necesario fortalecer las estrategias de prevención, educación y promoción de la salud.
Variability in case fatality rate risk due to Covid-19 according to health services provider in Mexico City hospitals
Authors: García-Peña Carmen , Bello-Chavolla Omar Yaxmehen , Castrejón-Perez Roberto Carlos , Jácome-Maldonado Luis David , Lozano-Juárez Luis Raymundo
Published: April 2022

Objective. To describe differences in Case Fatality Rate (CFR) for Covid-19 among healthcare subsystems in Mexico City between March and December 2020. Materials and methods. This is a retrospective secondary data analysis from the National Epidemiological Surveillance System data of Covid-19 cases. Information about health provider institutions was retrieved from the Catalogue of Health Establishments (CLUES). Logistic regressions were fitted to determine the association between health subsystems and mortality associated to Covid-19. The analyses were divided between hospitalized and ambulatory patients. Results. The probability of dying from Covid-19 was higher among those treated at Instituto Mexicano del Seguro Social (IMSS) (Hospitalized:OR=5.11, Ambulatory:OR=36.57), Instituto de Se­guridad y Servicios Sociales de los Trabajadores del Estado (ISSSTE) (Hospitalized:OR=2.10, Ambulatory:OR=9.19), Secretaría de Salud (SS) (Hospitalized:OR=1.94, Ambulatory:OR=5.29) or other public institutions (Hospitalized: OR=1.70, Ambulatory:OR=9.56) than in those treated in private in­stitutions. Conclusions. Differences in healthcare quality and access between health subsystems are profound. It is imperative to increase the capacity and quality of the different health subsystems to improve health outcomes.
Exacerbación de las inequidades educativas en tiempos de Covid-19
Authors: Pérez-Ferrer Carolina , Hubert Celia , Mendoza Laura
Published: April 2022

No disponible
Regional variability of glycemic control among adults with diabetes mellitus in Colombia
Authors: Ramírez-García Nathaly , García-Sierra Andrés Mauricio , King Christian , Valbuena-Garcia Ana Maria , Urina-Triana Miguel , Quintero-Baiz Adalberto , Acuña-Merchan Lizbeth Alexandra
Published: April 2022

Not available
mHealth: experiences and opportunities for cancer research in Mexico
Authors: Flores-Torres Mario H , Huerta-Gutierrez Rodrigo , Potter Michael B
Published: April 2022

Not available.
Aflatoxin levels and prevalence of TP53 aflatoxin-mutations in hepatocellular carcinomas in Mexico
Authors: Lino-Silva Leonardo S , Lajous Martín , Brochier Marion , Santiago-Ruiz Luis , Melchor-Ruan Javier , Xie Yi , Wang Mingyi , Wu Dongjing , Higson Herbert , Jones Kristine , Romero-Martínez Martin , Villalpando Salvador , Mohar Alejandro , Smith Joshua W , Alvarez Christian S , McGlynn Katherine A , Dean Michael , Groopman John
Published: April 2022

Objective. To determine the exposure to aflatoxin B1 (AFB1) in southern Mexico and the presence of the aflatoxin signature mutation in hepatocellular carcinoma (HCC) tissue from patients from a cancer referral center. Materials and methods. We estimated the prevalence and distribution of AFB1 in a representative sample of 100 women and men from Chiapas using the National Health and Nutrition Survey 2018-19. We also examined the presence of the aflatoxin signature mutation in codon 249 (R249S), and other relevant mutations of the TP53 gene in HCC tissue blocks from 24 women and 26 men treated in a national cancer referral center. Results. The prevalence of AFB1 in serum samples was 85.5% (95%CI 72.1-93.1) and the median AFB1 was 0.117 pg/μL (IQR, 0.050–0.350). We detected TP53 R249S in three of the 50 HCCs (6.0%) and observed four other G>T transversions potentially induced by AFB1. Conclusion. Our analysis provides evidence that AFB1 may have a relevant role on HCC etiology in Mexico.