bluuebunny/crossref_metadata_2025 huggingface dataset:
ON THE RATIO BETWEEN THE FEIGNED FINANCIAL ACCOUNTING OBJECT IN ADMINISTRATIVE LAW AND THE FEIGNED DEAL
Authors: Бакулина Ирина Петровна , Кириллов Дмитрий Александрович
Published: October 2021

Термин «притворный объект бухгалтерского учета» был включен в Кодекс об административных правонарушениях Российской Федерации в 2016 г. До сих пор изучение соответствующего понятия проводилось лишь экономистами. Однако, для целей правоприменения необходим юридический анализ. В статье на основании методов сравнительного правоведения впервые обосновывается возможность и пределы использования логической конструкции концепта «притворная сделка» для характеристики притворного объекта бухгалтерского учета. Также сформулированы признаки понятий «притворный правовой феномен» и «притворный объект бухгалтерского учета», показаны перспективы возможного использования этих понятий для юридической теории и практики.

The term «feigned financial accounting object» was included in the Code of Administrative Offenses of the Russian Federation in 2016. Until now, the study of the corresponding concept has been carried out only by economists. However, legal analysis is needed for enforcement purposes. In the article, on the basis of the methods of comparative jurisprudence, for the first time, the possibility and limits of using the logical construction of the concept of «feigned deal» to characterize a feigned financial accounting object are substantiated. The signs of the concepts of «feigned legal phenomenon» and «feigned financial accounting object» are also formulated, the prospects for the possible use of these concepts for legal theory and practice are shown.
Rozbor bezpečnosti letov UAV a konspekt aktuálnych legislatívnych požiadaviek
Authors:   University of Žilina, Škultéty Filip , Kandera Branislav , Janovec Michal
Published: October 2021

Despite the recent legislation, which has been formed in the last five years to its current form, the safety for the UAV operation is borne by the pilot, as he/she is the one who is responsible for the direction of UAV movement thus for any collision. For this reason, it is necessary to increase the safety of UAV operations outside the duties and competencies of the pilot at a distance, for example, through anti-collision systems and air traffic management systems. This article was initially focused on analysing aviation events in Slovakia associated with the operation of the UAV. Another factor that significantly affects the operation of UAVs to a large extent is the legislation itself. A special part was devoted to the legislation in terms of airspace determination, procedures and rules of operation of the UAV. From a legislative point of view, it is currently an important aspect to define the correct and reasonable level between the restrictions in order to increase the safety of operation only on an indispensable scale, not to be very restrictive to operators.
RIGHTS AND GUARANTEES OF A CIVIL SERVANT
Authors:   Attorney in bar associations “Gold Yustina” of Uzbekistan, Yuldashev Doniyor
Published: October 2021

The article analyzes the legal status of civil servants in terms of the rights, state guarantees andbenefits. These elements of the legal status are presented through the prism of comparative legal studies of the legislation of more than a dozen foreign countries, taking into account the experience of legal regulation of public civil service issues both in the post-Soviet space and in foreign countries. The system of state guarantees for civil servants is currently in a state of instability, which is caused by administrative reforms, the lack of a unified state personnel policy. The system of material and financial guarantees today is an operating system that enhances the prestige of the civil service as a social and legal institution.Keywords: public servant, civil servant, legal status,rights, state guarantees, social security
DEFINITION AND ESSENCE OF STRATEGIC PARTNERSHIP BETWEEN STATES
Authors:   Tashkent State University of Law of the Republic of Uzbekistan, Kudryavtsev Igor
Published: October 2021

The article examines in detail the concepts and essence of strategic partnership between states. The article also discusses the features of interaction in strategic partnership and allied relations between the Republic of Uzbekistan and many other states. The existence of a separate study on this topic isvery relevant at the moment. The current dynamics of the development of interstate relations has a significant impact on the development of forms of allied interaction and strategic partnership, placing increased demands on their effectiveness both at the stage ofcreation and at the stage of functioning.Keywords:law, state, society, civil society, rule of law, law
LABOUR RELATIONSHIPS IN CIVIL LAW. DIFFERENCE BETWEEN LABOUR AND CIVIL CONTRACTS
Authors:   private notary office in Andijan city of Uzbekistan, Islomqulova Shokhsanam
Published: October 2021

This article examines how and by what normative legal acts labor relations in civil law are regulated. This article analyzes errors and shortcomings in civil law contracts related to the provision of services in practice, as well as difference labor contracts and civil law contracts and errors that are allowed in their registration. The aspects and proposals that are necessary to eliminate and prevent offenses are also emphasized. The content, form, parties to the contract, obligations and rightsof the parties, obligations for violation of the contract, grounds for termination of the contract are also highlighted. And each of these above-listed aspects is compared with an employment contract. The differences arising from the comparison were studied by Russian and English scientists and their judgments on this situation were translated. Civil contracts regulating labor relations are considered on the example of the legislation of foreign states and the Republic of Uzbekistan. The advantages and disadvantages of a civil contract, its difference from employment contracts were explained by comparison in separate tables.Keywords:civil law contract, fee service contract, labor contract, contractor, customer, employee, employer, terms of contract
LABOR DISPUTES AND THE PROCEDURE FOR THEIR RESOLUTION: FOREIGN EXPERIENCE
Authors:   the Cabinet of Academy of the General Prosecutor's Office of the Republic of Uzbekistan, Shokirov Oybek
Published: October 2021

The article discusses labor disputes and the procedure for their resolution in the sections of such countries as the USA, Canada, Hungary, Poland, the Czech Republic and Slovakia, Romania and Croatia, France. In addition, using the comparative legal method, the labor legislation of the Republic of Uzbekistan was studied. In the course of the analysis, it was concluded that the Labor Code does not contain any limitation on the total number of employees included in the commission, now a labor dispute commission can be created at any, even a very small enterprise, the commission includes an equal number employee and employer representatives. In the context of the study of the category of collective labor disputes, the international experience of the ILO regarding collective bargaining practice was studied.Keywords:labor contract, ILO, UN, commission, labor dispute, employee, court, arbitration
THE CONCEPT AND GENERAL DESCRIPTION OF THE CIRCUMSTANCES THAT EXCLUDE THE CRIMINALITY OF THE ACT
Authors:   Higher Schoolof Judges under the Supreme Council of Judges of theRepublic of Uzbekistan, Otegenova Luiza
Published: October 2021

This article discusses the concept and general description of the circumstances that exclude the criminality of the act. Suggestions and recommendations were also made to improve the circumstances that exclude the criminality of the act. This article stipulates that in order for cases excluding the criminality of an act to be established by law, they must have certain characteristics, and for all cases excluding the criminality of an act, this concept is general and not illegal; not to be socially dangerous; issues that the person should not be at fault in the act were also analyzed.Keywords:criminality of the act, exception, status, crime, punishment, liability, illegality, guilt, social, attitude
INFORMATION OF TURKISH-SPEAKING SOURCES ABOUT RELATIONS OF THE CENTRAL ASIAN KHUNST AND THE OTTOMAN STATE
Authors:   National University of Uzbekistannamed after Mirzo Ulugbek of the Republic of Uzbekistan, Rakhmonkulova Zumrad
Published: October 2021

The article analyzes the political and diplomatic relations of the Ottoman Empire and the Central Asian khanates on the basis of documents from Turkic-language sources introduced into scientific circulation for the first time. An analysis of the Ottoman and Central Asian documents, identified by us in the Turkic-speaking sources, led to the conclusion that initially the ideas of a political union and unification with the Ottoman Empire on the basis of a single religion came from the Central Asian rulers. The revealed materials allow shedding light on the history of relations between the Ottoman Empire and the Central Asian khanates in the first half of the 19th -early 20th centuries. On the basis of previously unknown documents, the course and chronology of relations between the Central Asian states and the Ottoman Empire are considered, their assessment is given through the prism of the ideological ideas about the place of religion in the life of society
THE ROLE OF THE MAHALLA INSTITUTION IN DEEPENING DEMOCRATIC REFORMS
Authors:   Navoi State Pedagogical Institute of the Republic of Uzbekistan, Rakhmatov Murod G. , Jabborov Muhammadjon S.
Published: October 2021

The article tells that the makhalla has always been a place of national values, good deeds, kindness, harmony and harmony, awareness of the needy, people in need of help, weddings, celebrations, and sharing in good and bad times. Scientifically analyzed that certain customs and traditions are formed in the environment. It was also criticized that during the years of the formerSoviet ideology, that is, before Uzbekistan gained independence, the mahalla was not officially recognized and included in the system of state administration. The activities of makhallas were not focused on respecting and promoting national values, but on the ideas of the former dictatorial regime, the structure of which was determined by the characteristics of the administrative-command system.
Investigation of the integral strength and deformation characteristics of centrifuged and vibrocentrifuged concretes on activated Portland cement
Authors: Mailyan Levon , Vinogradova Elena , El'shaeva D. , Zherebtsov Y. , Dotsenko N. , Samofalova M.
Published: October 2021

In this work, a study of the integral strength and deformation characteristics of centrifuged and vibrocentrifuged concretes on activated Portland cement is carried out. Mechanical activation of cement was carried out using a specialized grinding unit. The manufacture of centrifuged and vibrocentrifuged samples was carried out on an experimental laboratory centrifuge. All samples were made from concrete of the same composition. In total, four basic samples of annular cross-section were manufactured and tested with the following dimensions: outer diameter D = 450 mm; inner hole diameter d = 150 mm; total height H = 1200 mm. The optimal values ​​of technological parameters of centrifugation and vibrocentrifugation are given. A scheme has been developed for obtaining small-sized samples from a common annular section to determine the strength and deformation characteristics. According to the results of the study, it was found that an improvement in the values ​​of integral strength and deformation characteristics when using activated Portland cement is observed in both centrifuged and vibrocentrifuged samples. It was found that samples made by vibrocentrifugation technology have the best strength and deformation characteristics than samples made by centrifugation. The conclusion is made about the technology of vibrocentrifugation as the most preferable for the manufacture of reinforced concrete products of annular section.
TECHNOLOGY FOR MONITORING CAPITAL CONSTRUCTION OBJECTS AT THE LIFE CYCLE STAGES BY REMOTE SENSING METHODS USING UNMANNED AIRCRAFT (DRONES) BASED ON HIGH PRECISION DIGITAL MODEL
Authors: Adamcevich Lyubov' , Vorob'ev Pavel , Zheleznov Egor
Published: October 2021

In modern construction at the stages of investment assessment, design, construction and operation of capital construction facilities with the implemented information modeling system, a serious problem is the harmonization of data collected from the construction site on the geometric parameters of the facility and territory being built. The article presents a comprehensive scientific and technical solution in the field of diagnostics of buildings and structures, monitoring the progress of construction, as well as automated determination of the volume of construction work performed using remote sensing technologies using unmanned aerial vehicles and information modeling (BIM technologies).
PENURUNAN KADAR FFA ( FREE FATTY ACID) MENGGUNAKAN ADSORBEN DARI TEMPURUNG KELAPA
Authors: Luthfia Afifa , Azhari Azhari , Suryati Suryati , Sulhatun Sulhatun , Meriatna Meriatna
Published: October 2021

Crude palm oil atau CPO merupakan minyak kelapa sawit mentah yang diperoleh dari hasil ekstraksi atau dari proses pengempaan daging buah kelapa sawit dan belum mengalami pemurnian. Tempurung kelapa memiliki komposisi kimia mirip dengan kayu, yang mengandung lignin, selulosa, dan hemiselulosa. Karbon aktif adalah suatu bahan yang berupa karbon amorf yang mempunyai luas permukaan yang sangat besar yaitu 300 - 2000 m2/gram. Tujuan dari penelitian adalah mengetahui faktor-faktor pengaruh penurunan FFA (free fatty acid) menggunakan adsorben dari tempurung kelapa dan mengetahui pengaruh dari banyak adsorben yang digunakan dan waktu adsorpsi terhadap penurnan FFA (free fatty acid) pada CPO (crude palm oil). Kandungan FFA (free fatty acid) awal adalah sebesar 16,00 %  dan waktu adsorpsi yang digunakan adalah 30, 35, 40, dan 45 menit, pada waktu 30 menit terjadi penuruan asam lemak bebas sebesar 10,25%, 9,84% dan 8,97%. Untuk waktu 35 menit, penurunan asam lemak bebas sesebesar 7,84%, 7,69%, dan 7,59%. Untuk waktu 40 menit, penurunan asam lemak bebas sebesar 7,17%, 6,92%, dan 6,56%. Untuk waktu 45 menit,  penurunan asam lemak bebas sebesar 6,20%, 6% dan 5,64%. Variasi berat adsorben yang digunakan adalah 3 gram, 5 gram, dan 7 gram. Pada variasi berat adsorben 3 gram, penyerapan paling maksimal sebesar 6,20 %. Pada variasi berat adsorben 5 gram, penyerapan paling maksimal sebesar 6,00 %. Pada variasi berat adsorben 7 gram, penyerapan paling maksimal sebesar 5,64 %. Semakin lama waktu adsorpsi, maka kandungan FFA setelah proses adsorpsi semakin kecil. Makin banyak adsorben yang digunakan maka semakin besar luas permukaan kontak antara adsorben dengan CPO.
PEMANFAATAN LIMBAH SERBUK KAYU PADA INDUSTRI KUSEN DI BLANG PULO MENJADI ARANG BRIKET SEBAGAI SUMBER ENERGI ALTERNATIF
Authors: Salahudin Ari , Dewi Rozanna , Jalaluddin Jalaluddin , ZA Nasrul , Nurlaila Rizka
Published: October 2021

Briket merupakan energi alternatif pengganti bahan bakar yang dihasilkan dari bahan-bahan organik atau biomasa yang kurang termanfaatkan. Beberapa jenis limbah biomasa memiliki potensi yang cukup besar seperti limbah kayu, sekam padi, jerami, ampas tebu, cangkang sawit. Penelitian ini bertujuan untuk memanfaatkan limbah serbuk kayu pada industri kusen agar menjadi barang yang bernilai ekonomis dengan parameter pengujian meliputi analisis kadar air, kadar abu dan nilai kalor. Pembuatan briket ini berbahan baku dari serbuk kayu yang dimulai dari proses pengarangan kemudian ditumbuk dan disaring dengan ukuran ayakan 50 mesh, kemudian dicampur dengan perekat dan dicetak lalu dioven selama 2 jam. Adapun perekat yang digunakan adalah tepung kanji dan air tebu dengan variasi perekat masing-masing 35 ml, 40 ml, 45 ml, 50 ml dan 55 ml. Hasil penelitian menunjukan bahwa beberapa briket sudah memenuhi SNI No.1/6235/2000 briket arang. Hasil terbaik diperoleh pada variasi perekat 45 ml perekat kanji dan air tebu, masing-masing menunjukan kadar air 7,34% dan 7,76%, kadar abu 7,542% dan 7,92% dan nilai kalor 6.335,651 cal/gr dan 5.477,88 cal/gr. Melihat dari hasil penelitian ini bahwa serbuk kayu dari limbah industri kusen dapat dijadikan salah satu bahan baku alternatif dalam pembuatan briket.
PENURUNAN KADAR FREE FATTY ACID (FFA) PADA CRUDE PALM OIL (CPO) DENGAN PROSES ESTERIFIKASI MENGGUNAKAN KATALIS ASAM SULFAT (H2SO4)
Authors: Harahap Reza Abdillah , Azhari Azhari , Meriatna Meriatna , Sulhatun Sulhatun , Suryati Suryati
Published: October 2021

Asam lemak bebas adalah asam lemak yang terpisahkan dari trigliserida, digliserida, monogliserida, dan gliserin bebas. Minyak kelapa sawit merupakan minyak nabati berwarna jingga kemerah-merahan yang diperoleh dari proses pengempaan (ekstraksi) daging buah tanaman Elaeis guinneensis. Tujuan dari penelitian ini adalah menganalisis penurunan kadar asam lemak bebas dari minyak kelapa sawit dengan menggunakan katalis homogen asam sulfat. Proses esterifikasi mereaksikan minyak dan metanol dengan menggunakan katalis asam sulfat. Pengaruh dari berbagai variabel proses seperti waktu reaksi dan persentase massa penggunaan katalis diamati dalam percobaan ini. Penurunan kadar asam lemak bebas, densitas, dan viskositas dianalisa dan dibandingkan dengan Standar Nasional Indonesia (SNI) 01-2901-2006 tentang minyak kelapa sawit mentah (Crude Palm Oil). Kadar asam lemak bebas awal yang diperoleh pada penelitian adalah 10,59 %. Sedangkan penurunan kadar asam lemak bebas setelah dilakukan proses esterifikasi paling bagus yang didapat adalah 2,23% dengan menggunakan persentase penggunaan katalis 1,4% pada suhu 60 oC selama 130 menit. Hasil yang diperoleh pada penelitian ini menunjukkan bahwa katalis asam sulfat pekat dapat menurunkan kadar asam lemak bebas yang terkandung didalam minyak kelapa sawit.
Challenges of Teaching Mathematics to Students With Visual Impairment
Authors: Oyebanji M S , Idiong Ubong Sam
Published: October 2021

This study aimed at investigating the challenges of teaching mathematics to visual impaired students in school of the blind, a case study of some selected schools for the visually impaired. Questionnaire and interview were used for data collection from the respondents. The hypotheses in the study were tested using t-test with α-level of 0.05 through SPSS. The study followed a cross-section survey design and involved 80 respondents 20 for the visually impaired students, 10 for the Mathematics teachers, 10 special mathematics teachers, 40 low vision and non-visually impaired students. The findings revealed the visually impaired students receive bursaries from the government and non-government organization; meal, accommodation, and few scholastic materials from their school; extra time during mathematics classes and examination and friend support. However, constraining limitations in the method of instruction assessment used and the instructional materials provided were noted, on the basis of these findings, recommendation towards the better education of the visually impaired student studying mathematics should be encouraged and employment of special mathematics teachers.
Science Students’ Spontaneous Utilization of School Library with Logistic Growth Model: A Focus on Gender
Authors: Obasi Chinedu Victor
Published: October 2021

In this paper the logistic growth model of spontaneous utilization of school library in Imo State, is presented. First‐order variables separable logistic equation is solved. The parameters that gave the best logistic curve for the data were determined. The number of male and female science students who utilized school library spontaneously also is presented. The logistic equation allows rigorous estimation of 2.34% growth rate of male science students’ spontaneous utilization of school library in Imo State. While that of female students is decreasing by 2.71%. The results revealed that male students are experiencing upward trend in the spontaneous utilization of school library while their female counterparts are experiencing downward trend. Therefore, it is recommended that science students should utilize the school library resources spontaneously without being induced to do so. They should also develop passion for reading because reading books pushes readers to use their imaginations and encourages creativity for scientific endeavours.
The Implementation of Group Investigation Learning Model Through Domino Mathematics Media on the Rank Number and Root Form Materials
Authors: Eviyanti Cut Yuniza , Rista Lia , Hadijah Siti , Andriani A
Published: October 2021

This study aims to find out the results of students' learning through the implementation of a group investigation learning model through mathematical domino media better than the implementation of a conventional learning model on the rank number and root form materials. The research was a quasi-experiment with the design of a randomized control group pretest-posttest. The population of this research is the entire class IX SMP Negeri 1 Lhokseumawe consisting of 9 classes. The research sample was determined by a randomized technique that made 2 classes namely experiment class (IXA) and control class (IXB). The results of the student posttest data test show that the data is distributed normally and homogeneously, so it can be analyzed with one-side t-test statistics at a significant α= 0.05. Based on the results of data processing against the posttest students obtained sig scores. (2-tailed) posttest data is 0.001 which means less than α= 0.05, this means H0 is rejected, so it can be concluded that the learning results of students taught by the group investigation learning model through domino mathematics media are better than conventional learning models on the rank number and root form materials in grade IX of SMP Negeri 1 Lhokseumawe.
Deposición de nanopartículas de oro con morfología esferoidal mediante pirólisis en fase de aerosol asistido por ultrasonido
Authors: Gómez Idalia , De La Garza Maria
Published: October 2021

Se depositaron nanopartículas de oro con morfología esferoidal en sustratos de vidriomediante pirólisis en fase aerosol asistido por ultrasonido y usando el ZrO2 como matriz dispersante, la deposición se realizó a tres diferentes velocidades de flujo del gas acarreador. Mediante espectrofotometría UV-Vis se observó el pico de la resonancia de plasmones superficiales,característico de las nanopartículas de oro, con un corrimiento hacia rojo conforme aumenta lavelocidad de flujo; este corrimiento es debido a cambios en el tamaño de partícula. Por difracción derayos-X se confirmó la presencia de oro y de ZrO2, se observó un crecimiento preferencial de lasnanopartículas de oro en el plano {111 }. Mediante microscopia electrónica de barrido y microscopia de fuerza atómica se observó que las nanopartículas presentan morfología esferoidal con una relación aproximada de 2:1, el tamaño de las nanopartículas aumentó con la velocidad de flujo, confirmando los resultados obtenidos por UV-Vis.
Synthesis of 3-oxo-3-Phenyl-2,2,5-trimethyl-1,3-oxaphosphorinanes and their tetrafluoroborate salts
Authors: López Cortina Susana , Elizondo Martínez Perla , Pérez Rodríguez Nancy , Hernández Fernández Eugenio , Fernández Zertuche Mario
Published: October 2021

The synthesis and characterization of cis- and trans- 3-oxo-3-phenyl-2,2,5-trimethyl-1,3-oxaphosphorinanes (7a and 7b) and their corresponding tetrafluoroborate salts (3a and 3b) , heterocyclic organophosphorus compounds not previously reported in the literature, was accomplished. They were fully characterized by 1H, 13C and 31PNMR. It was established the relative configuration of these compounds on the basis of an X-ray diffraction study of oxide 7a.
Chemical composition, structure and properties of glass and glass-ceramic materials in the system of BaO (PbO)- B2O3 - Al2O3 -TiO2
Authors: Ruiz Valdés J.J. , Gorokhovsky A. , Escalante García J.I.
Published: October 2021

The vitrification and crystallization of glasses in the system BaO(PbO)-B2O3-Al2O3-TiO2, containing (mol %): BaO (24.6-28.1 ), PbO (2.8-3.2), B2O3 (7.6-24.0), Al2O3 (15.9-25.5), TiO2 (39.1-41.1) were investigated. The batch compositions of different oxide molar ratios were fused in an electric furnace in a platinum crucible at 1450 ºC for 2 h and cast into cylindrical-shaped samples. The obtained glasses were crystallized at 950 ºC for 2h. BaTiO3 was recognized as a dominant crystalline phase in the produced glass-ceramic materials. The influence of B2O3 and Al2O3 contents on the chemical resistance, mechanical strength and dielectric properties was investigated. It is shown that the glass compositions containing (mol %): B203 7-25 and Al2O3 16-20 displayed the optimal combinations of exploitation properties. The influence of liquid phase separation on the abovementioned properties was also analyzed.
Semiconducting Thin Films of CuSbS2
Authors: Messina Sarah , Hernández Paz , Peña Yolanda
Published: October 2021

In this paper we present a method to produce polycrystalline CuSbS2 thin ?lms through a solid-state reaction at 350 ºC and 400 ºC involving thin ?lm multilayer of Sb2S3 -CuS or Cu2-xSe by chemical bath deposition technique. The formation of the ternary compound was confirmed by X-ray di?raction (XRD). A direct optical band gap of approx. 1.57 eV anda p-type electrical conductivity of 10-3 (Ω•cm)-1 were measured. These optoelectronic characteristics show perspective for the use of CuSbS, as a suitable absorber material in photovoltaic applications.
Síntesis de whiskers de SiC asistida por microondas
Authors: Garza-Méndez F. J. , Vanegas-Colín A. J. , Martínez-Quiroz M. D. , Reyna-Chávez D. D.
Published: October 2021

Se desarrolló un nuevo proceso para la síntesis de whiskers de SiC asistida por microondas, basada en la mezcla de xerogeles de sílice y grafito en polvo. Como fuente de energía se emplearon microondas de 2.45 GHz y 1.5 kW de potencia, la síntesis se llevó a cabo en un horno de microondas casero sin modificar. Por otra parte, la sílice mesoporosa se sintetizó vía sol-gel, los precursores usados para esta síntesis fueron TEOS/H2O y etanol. Mediante difracción de rayos-x método de polvos se demostró que la sílice sintetizada es amorfa y que los polvos obtenidos en el microondas corresponden a -SiC. La técnica BET en un ciclo de adsorción desorción de N2 proporcionó un valor de tamaño de poro de 3.0 nm y un área superficial de 1090 m2/g. Para determinar la morfología de los whiskers de SiC se analizó por MEB en el modo de electrones secundarios. El efecto de las microondas utilizadas se discute en la sección de síntesis en el presente trabajo.
Microwave-assisted synthesis and characterization of microstar shaped zinc oxide
Authors: Gómez Idalia , Yucam´án Miguel José , Palomar Flor
Published: October 2021

A microwave-assisted solution-phase approach has been applied for the synthesis ofzinc oxide microstructures. Toe synthesis procedure was carried out by using the reagents: Zinc ni trate and Methenamine, at stoichiometric ratio. Analysis by means ofX-ray Diffraction (XRD) shows a crystalline phase in hexagonal wurtzite arrangement for ZnO. The presence ofmicrostar shaped zinc oxide (2-3μm) with nanorods,f50nm) arranged has been confirmed from High Resolution Scanning Electron Microscopy (HRSEM). The formation of nanorods was confirmed by Transmission Electron Microscopy. In Raman spectroscopy a red shift was detected in the microstructures compared with ZnO bulk. High crystalline materials without additional post-synthesis treatrnent were found.
Nanocompuestos de P30T y Óxido de Grafeno para Aplicaciones Fotovoltáicas: Caracterización Física y Fisicoquímica
Authors: López Mata C. , Velasco Santos C. , Martínez A.L , Aguilar J.O , Campos J. , Zavala Pimentel J.M
Published: October 2021

Fueron incorporadas nanoestructuras de óxido de grafeno (GROX) en una matriz de poli-3-octiltiofeno (P3OT). Se llevó a cabo la caracterización fisica y fisicoquímica de las nanoestructuras de GROX y de las mezclas obtenidas en forma de películas compuestas. Las técnicas de caracterización empleadas fueron: Infrarrojo por Transformada de Fourier (FTIR), espectroscopía Raman, Microscopía Electrónica de Transmisión (TEM, Transmision Electronic Microscopy), Microscopia de Fuerza Atómica (AFM, Atomic Force Microscopy). Las propiedades ópticas y eléctricas de los nanocompuestos fueron caracterizadas en función de la concentración del óxido de grafeno presente en la mezcla (5, 1 O y 20% en peso respecto al polímero w/w). Se encontró que las películas compuestas con 10% en peso de GROX formaron una celda solar de contacto metal-semiconductor cuando el arreglo estructural fue ITO/PO3T-GROX/ Al.
Potential oxygen-carrying complexes by design
Authors: Rosas García Víctor M. , Elizondo Martínez Perla , Pérez Rodríguez Nancy , Nájera Martínez Blanca
Published: October 2021

There are twenty four elements known to be necessary for human life, seven of which are transition metals. These seven elements; V, Cr, Mn, Fe, Co, Cu, and Zn have an important role in living systems due to their ability to form complexes with diverse donor groups present in biological systems. [Co(salen)] has been previously studied as a model compound for oxygen transport. In this work other metallic complexes, Ni(II), Zn(II), Cu(II) and Fe(II) with N,N'-bis(salicylaldehyde)ethylenediamine  (salen-H2) were synthesized. The active form of each complex was obtained by reaction with dimethylsulfoxide. The ability of these metallic complexes to act as O2 carriers was determined. From the results, the complexes of the Co(II), Fe(II) and Cu(II) with salen are able to transport oxygen with an ordering of Co(II) > Fe(II) > Cu(II) regarding the capacity to carry O2. We used the PM7 semiempirical hamiltonian to study the complexes of salen with Co(II), Cu(II), Fe(II) and Ni(II) and their potential as oxygen carriers. We performed full geometry optimizations in the gas phase for each complex, its active form with DMSO as ligand, and with dioxygen complexed with the active form. We discuss energetic features associated with the binding of dioxygen to the complexes.
Síntesis y caracterización de electrocatalizadores basados en calcogenuros nanoestructurados de Ru-WSi/C y Ru-WS2/NTC
Authors: Arango Asunción , Fernandez Madrigal A. , Sánchez Rubio Manuel , Gochi Ponce Y.
Published: October 2021

En este trabajo se llevó a cabo una reacción química entre metales de transición, específicamente tiosales de tungsteno yrutenio para sintetizar dos precursores catalíticos soportados en carbón Vulcan y un precursor catalítico soportado ennanotubos de carbono (NTC). Los materiales se caracterizaron por difracción de rayos X (DRX), microscopía electrónicade barrido (MEB) y microscopía electrónica de transmisión (MET). El electrocatalizador comercial de Pt/C al 20 % enpeso metálico se utilizó para comparar el desempeño catódico de los electrocatalizadores sintetizados y basados encalcogenuros de Ru-WS2. Los electrocatalizadores obtenidos se analizaron mediante técnicas voltamperométricas para lareacción de reducción de oxígeno (RRO) en medio ácido. El electrocatalizador RuxWvSz /C resultó 38 % más eficientepara la generación de corriente como cátodo respecto al electrocatalizador RuxWvS2z /C. Este resultado se atribuye a laalta dispersión y homogeneidad en el tamaño nanométrico de las partículas metálicas de la fase activa.
Beneficiamiento de Minerales de Caolín
Authors: E. Palomar Flor , Gómez Idalia
Published: October 2021

En el presente trabajo se muestran los resultados de lavado químico y tratamientos térmicos para llevar a cabo procesos de beneficiamiento en tres tipos de caolines, provenientes de la mina Villa de Reyes en el Estado de San Luis Potosí; México. Los tratamientos térmicos llevados a cabo fueron a 1200, 1300 y 1350 °C, en rampas de 5 y 20 °C/min, en tiempos de estancia de 5 y 30 min. en atmósfera de aire. Las muestras de caolín fueron caracterizadas por difracción de Rayos X en polvos, espectroscopia por UV-Vis, microscopía óptica y electrónica de barrido. Los análisis por difracción de Rayos X muestran reflexiones características de caolinita, cristobalita y cuarzo, acompañado de cantidades minoritarias de saponita, wollastonita y stellerita. Los análisis por UV-Vis mostraron contenidos de Fe desde 2.24 a 1.80% en peso. Después del lavado químico y tratamientos térmicos se determinó que el contenido de Fe en todos los caolines disminuyó, hasta en un 86% aproximadamente. Obteniendo los mejores resultados a 1350 °C, 20 °C/min y tiempo de estancia 30 min.
Determinación del Carcinógeno Específico del Tabaco 4-(metilnitrosamino )- 1-(3- piridil)-1-butanol en Orina: 20 años de Evolución en los Métodos de Preparación de Muestra
Authors: Escobar Saucedo Magdalena , Waksman Minsky Noemí , Lucio Gutiérrez J. Ricardo , Castro Ríos Roció , Salazar Cavazos Ma. de la Luz , Rojas Martínez Augusto
Published: October 2021

El tabaco se encuentra entre las primeras causas de mortalidad y morbilidad en el mundo. En México hay 17.3 millones de fumadores y alrededor de 60 mil personas mueren por causas atribuibles al tabaco. El 4-(metilnitrosamino )-1-(3-piridil)- l butanol o NNALes un carcinógeno del grupo 1 según la Agencia Internacional para la investigación de Cáncer, el cual es eliminadoporelorganismoenformade conjugado del ácido glucorónico (NNAL-glu), debido a lo cual, la relación NNAL-Glu/NNAL libre es un potencial indicador de riesgo para desarrollar cáncer de pulmón. La presente revisión se enfoca en la importancia de la etapa de preparación de muestra en métodos bioanalíticos, así como en las técnicas de preparación de muestra empleadas para la determinación del NNAL en muestras de orina humana reportadas desde el año 1993 hasta 2013. También incluye una sección donde se examinan algunas tendencias del tratamiento de muestras para mejorar el rendimiento de los análisis, dentro de las cuales se pueden mencionar las técnicas de microextracción, SPE en-línea, liofilización, derivatización, entre otras.
Determinación del Contenido Total y Lixiviable de Antimonio en Contenedores Plásticos PET por Espectroscopia de Fluorescencia Atómica
Authors: Chapa Martínez C. A. , Hinojosa Reyes L. , Ruíz Ruíz E. , Hernández Ramírez A. , Guzmán Mar J. L.
Published: October 2021

El antimonio (Sb) es un elemento tóxico para la salud humana. Trabajos recientes realizados en Estados Unidos y Europa sugieren que el tereftalato de polietileno (PET) puede lixiviar Sb, por lo cual es de interés realizar este estudio en México, donde presenta un elevado uso para embotellar agua de consumo éste material plástico. Para evaluar la concentración de Sb lixiviado de plásticos PET para almacenar agua de consumo, se estudiaron las condiciones a las cuales estos contenedores son sometidos y que pueden favorecer la lixiviación del Sb contenido en el PET de botellas, como son: pH, tiempo de exposición y temperatura. Las condiciones de lixiviación fueron evaluadas aplicando un diseño de experimentos factorial completo 23. Además se determinó el contenido total de Sb presente en los plásticos después de una digestión ácida asistida por microondas. El análisis del contenido total de Sb en las muestras de digestión ácida y de lixiviados se llevó a cabo por Espectroscopia de Fluorescencia Atómica con sistema de Generación de Hidruros (HG/AFS). El análisis de la concentración total así como el contenido de Sb potencialmente lixiviable se aplicó a envases para contener agua o bebidas carbonatadas disponibles comercialmente en la región. La concentración inicial lixiviada de Sb en el agua contenida en las botellas de PET fue de 0.06+0.02 a 2.21+0.40 μg Sb/L, de la misma formas el contenido total de Sb en el plásticos presente en las diferentes marcas evaluadas fue desde 68.6+6.1 hasta 110.1+9.1 mg Sb/kg de PET. A partir del diseño de experimentos se estableció que concentraciones altas de Sb lixiviado de los plásticos PET se presentan a pH 7 y 5 días de exposición a una temperatura de 75%C. Las concentraciones encontradas van de 1.2+0.1 a 16.4+0.3 μg/L, de entre las cuales solo dos muestras están por arriba y tres muestras en el limite máximo permitido para agua potable de la Unión Europea (UE) que es de 5 ug/L, representando un riesgo potencial para la salud humana.
Preparación de películas delgadas de TiO2 con nanopartículas de Au
Authors: Gómez Idalia , Serrano Karla
Published: October 2021

Este trabajo tiene como propósito principal el estudio de la preparación de nanopartículas de oro sobre películas delgadas de TiO2 soportadas en vidrio mediante dos técnicas: rocío pirolítico y sol-gel. Para tal efecto se estudiará la estabilidad y homogeneidad de las películas delgadas así como la formación de nanoestructuras de Au sobre la matriz de TiO2.
Preparación de Películas Delgadas de Sb2(S,Se)3 por el Método de Depósito por Baño Químico
Authors: Peña Yolanda , Ramírez Edgar
Published: October 2021

Se obtuvieron películas delgadas de Sb2(S,Seh por la técnica de depósito por baño químico a partir de películas delgadas de Sb2Se3 y Sb2S3 a través de tratamiento térmico a 350 ºC y 50x10-3 Torr en atmósfera de nitrógeno durante 1h. Se estimaron energías de banda prohibida de 1.06 - 1.55 eV y conductividades del orden de 10-7 a 10-6 (S·cm-1). Se corroboró la obtención del material por difracción de rayos X.
La descripción teórica del desempeño electroanalítico de nuevos derivados hidroquinónicos en la cuantificación de estradiol.
Authors: Tkach Volodymyr , V. Kushnir Marta , M. Storoshchuk Nataluia , C. de Oliveira Sílvio , M. Dytynchenko Inna , V. Lystvan Vitalii , V. Luganska Olga , V. Kopiika Vira , l. Yagodynets Petro
Published: October 2021

Por primera vez fue estudiado el uso de los nuevos compuestos hidroquinónicos como modificadores de electrodo, durante la electrooxidación de estradiol. La transferencia de protones puede ser realizada a través de un mecanismo híbrido. Sin embargo, el estudio teórico confirma que las nuevas hidroquinonas pueden ser modificadores eficientes en la detección electroanalítica del estradiol en medios neutros. El comportamiento oscilatorio, en este sistema, es posible, siendo causado por más de un proceso de electrooxidación y sus influencias en las capacitancias de la doble capa eléctrica.
The Diversity of Major Insect Pests at Sugarcane Development Center In Dompu Distrcit, West Nusa Tenggara
Authors: Sarjan Muhammad , Muchlis Muchlis , Muthahanas Irwan
Published: October 2021

Sugar cane (Saccharum officinarum Linn.) is a tropical plant that is very important because it can be used as one of the raw materials for making sugar. The development of sugar production in the last ten years has decreased by around 1.8% per year, this is due to several factors, one of which is due to the attack of sugarcane insect pests. Therefore, research was conducted to find out the diversity of important insect pests in sugarcane plants in the center of sugarcane development in the Dompu  District. This research was conducted at the Pekat Sub District of Dompu District, West Nusa Tenggara. The method used is a descriptive method with data collection techniques directly and indirectly in the field at a number of observation points. Based on the observations there were 5 species of insect pests in the research area such as Valanga nigricornis, Locusta migratoria, Ceratovacuna lanigera, Scirchopaga nivella F., and Lepidiota stigma. Insect pests with the highest population and dominance are Ceratovacuna lanigera with an average population of 70 insect/plant and a domination index is  0 .199808. Locusta migratoria has a level of damage with criteria for moderate attack intensity, it is found in sugarcane plants aged 3 months. The results of this study indicate that Scirchopaga nivella F. and Lepidiota stigma F. insect pests have the potential as important pest insects on sugarcane crops
Effect of Local Culture Based Learning in Science on Critical Thinking and Student Communication Skills
Authors: Hikmawati Hikmawati , Gunawan Gunawan , Sahidu Haerunisyah , Kosim Kosim
Published: October 2021

Learning in every education unit in Indonesia is expected to develop good local cultural values so that it can make changes for the better in the future. In order to face future global competition, students at universities must have critical thinking and communication skills. This study aims to examine the effects of local culture-based learning in the field of Science on students' critical thinking and communication skills. The method used in this research is quantitative method with a posttest-only control group design. The subjects in this study were 58 students who attended the Study and Learning lectures at one of the universities in Mataram. Learning theories discussed through local culture-based learning for 8 meetings are behavioristic, cognitive, constructivist, and humanistic learning theories. The instruments used in this study were a test of critical thinking skills and an assessment sheet for student communication skills. Data analysis to test the research hypothesis using SPSS 25. The research showed that there were differences in critical thinking and communication skills between groups of students whose learning was based on local culture in the field of Science and groups of students whose learning was using conventional models. The level of critical thinking skills and communication skills in the group of students whose learning is based on local culture in the field of Science is higher when compared to the group of students whose learning uses conventional models
Increasing the Motivation and Learning Outcomes of Students through the Application of the Problem Based Learning Model in Learning Physics
Authors: Velly Desta
Published: October 2021

The results of the learning test show that almost more than half of the students have not been able to solve the questions well, so learning improvements or innovations are needed. Problem based learning is one of the recommended learning models in the implementation of the 2013 curriculum because this model is proven to be able to stimulate higher-order thinking skills by designing problems in real contexts. The purpose of this action research is to improve learning outcomes and student motivation in the application of the Problem Based Learning model in learning physics. The subjects of this study were students of class XI MIPA 2, Public Senior High School 12 Pekanbaru. This research is a classroom action research conducted in 2 cycles. The results of this study obtained test data on the learning outcomes of students in cycle I with absorption of 75.25%, in cycle II absorption of 81.29%, motivation of students in learning cycle I and cycle II in good categories.
Pengaruh Algoritma ADASYN dan SMOTE terhadap Performa Support Vector Machine pada Ketidakseimbangan Dataset Airbnb
Authors:   Magister Teknik Informatika, Universitas Amikom Yogyakarta, Hidayat Wahyu , Ardiansyah Mursyid ,   Magister Teknik Informatika, Universitas Amikom Yogyakarta, Setyanto Arief ,   Program Studi Teknik Informatika, Universitas Amikom Yogyakarta
Published: October 2021

Traveling activities are increasingly being carried out by people in the world. Some tourist attractions are difficult to reach hotels because some tourist attractions are far from the city center, Airbnb is a platform that provides home or apartment-based rentals. In lodging offers, there are two types of hosts, namely non-super host and super host. The super-host badge is obtained if the innkeeper has a good reputation and meets the requirements. There are advantages to being a super host such as having more visibility, increased earning potential and exclusive rewards. Support Vector Machine (SVM) algorithm classification process by these criteria data. Data set is unbalanced. The super host population is smaller than the non-super host. Overcoming the imbalance, this over sampling technique is carried out using ADASYN and SMOTE. Research goal was to decide the performance of ADASYN and sampling technique, SVM algorithm. Data analyses used over sampling which aims to handle unbalanced data sets, and confusion matrix used for testing Precision, Recall, and F1-SCORE, and Accuracy. Research shows that SMOTE SVM increases the accuracy rate by 1 percent from 80% to 81%, which is influenced by the increase in the True (minority) label test results and a decrease in the False label test results (majority), the SMOTE SVM is better than ADASYN SVM, and SVM without over sampling.
Rancang Bangun Sistem Informasi Bank Sampah di Desa Paguyangan
Authors:   Program Studi Teknik Informatika, Universitas Jenderal Soedirman, Afuan Lasmedi , Nofiyati Nofiyati ,   Program Studi Teknik Informatika, Universitas Jenderal Soedirman, Umayah Nasichatul ,   Program Studi Teknik Informatika, Universitas Jenderal Soedirman
Published: October 2021

Garbage is the residual material resulting from a production process, both industry and households. Based on Brebes district's statistical data, the Paguyangan sub-district is in fourth place with an average of 249.62 m3 of garbage per day. Paguyangan is one of the villages in the Paguyangan sub-district. Paguyangan has a garbage problem where people still have the habit of throwing garbage in the river and yards around the house. Based on this, the Paguyangan Village Hall plans to build a garbage bank to overcome the problem. A garbage bank managed activities such as recording saving's transactions. This study conducted a web-based design of the Garbage Bank Information System (SIBS). SIBS is an information system used to help process garbage transactions at a garbage bank. The purpose of this SIBS is to facilitate officers and customers in processing services at the garbage bank. The methodology used in system development is the Waterfall method. SIBS development uses PHP as a programming language and MySql as the DBMS. The result of this research is an information system that can be used in the management of Waste Management transactions. The results of system testing using Black box Testing and Mean Opinion Score (MOS) obtained that all components in this system are running well according to needs.
Komparasi Distance Measure Pada K-Medoids Clustering untuk Pengelompokkan Penyakit ISPA
Authors:   Program Studi Teknik Informatika, Universitas Singaperbangsa Karawang, Pamulang Mia Nuranti Putri , Aini Mia Nuur ,   Program Studi Teknik Informatika, Universitas Singaperbangsa Karawang, Enri3 Ultach ,   Program Studi Teknik Informatika, Universitas Singaperbangsa Karawang
Published: October 2021

K-Medoids is an unsupervised algorithm that uses a distance measure to classify data. The distance measure is a method that can help an algorithm classify data based on the similarity of the variables. Several studies have shown that using the right distance measure can improve the performance of the algorithm in clustering. Euclidean and Chebyshev is two of some distance measures that can be used. In 2016, Karawang Health Office stated that 175.891 Karawang citizens were suffering from ISPA. This figure continued to increase in the following year until 2019. The total of Karawang citizens who suffering from ISPA reached 181.945 people. To assist the government in overcoming this problem, a clustering process will be carried out to group the areas where the ISPA is spreading in Karawang District. The area will be divided into three clusters, namely low, medium and high. Comparison of distance measures is carried out to find the best model based on the evaluation of the Davies Bouldin Index (DBI). The use of Euclidean-distance produces a DBI score of 0,088 meanwhile the use of Chebyshev distance resulted in a DBI score of 0,116. The performance of the K-Medoids algorithm with Euclidean-distance is considered to be better than Chebyshev distance because it produces a DBI score that is near to 0.