bluuebunny/crossref_metadata_2025_split huggingface dataset:
Crown ethers for the synthesis of heterocycles
Authors: Kaur Navjeet , Ahlawat Neha , Verma Yamini , Grewal Pooja , Bhardwaj Pranshu , Jangid Nirmala Kumari 
Published: May 2021

:
Heterocyclic compounds are the largest and most diverse family of organic compounds. Among them, aromatic heterocyclic compounds are the structural motifs found in many biologically active synthetic and natural compounds, agrochemicals, and medicines. Moreover, aromatic heterocyclic compounds are extensively utilized to form dyes and polymeric materials of great importance. In organic synthesis, there are several reports on the uses of aromatic heterocyclic compounds as intermediates. In this review article, we have focused on the synthesis of heterocycles using crown ethers.
Synthesis, Characterization, Applications, and Toxicity of Green Synthesized Nanoparticles
Authors: Galúcio João Marcos Pereira , de Souza Sorrel Godinho Barbosa , Vasconcelos Arthur Abinader , Lima Alan Kelbis Oliveira , da Costa Kauê Santana , de Campos Braga Hugo , Taube Paulo Sérgio 
Published: May 2021

Abstract:Nanotechnology is a cutting-edge area with numerous industrial applications. Nanoparticles are structures that have dimensions ranging from 1 – 100 nm, which significantly exhibit different mechanical, optical, electrical, and chemical properties when compared with their larger counterparts. Synthetic routes that use natural sources, such as plant extracts, honey, and microorganisms, are environmentally friendly and low-cost methods that can be used to obtain nanoparticles. These methods of synthesis generate products that are more stable and less toxic than those obtained using conventional methods. Nanoparticles formed by titanium dioxide, zinc oxide, silver, gold, and copper, as well as cellulose nanocrystals, are among the nanostructures obtained by green synthesis that have shown interesting applications in several technological industries. Several analytical techniques have also been used to analyze the size, morphology, hydrodynamics, diameter, and chemical functional groups involved in the stabilization of the nanoparticles as well as to quantify and evaluate their formation. Despite their pharmaceutical, biotechnological, cosmetic, and food applications, studies have detected their harmful effects on human health and the environment, and thus, caution must be taken in uses involving living organisms. The present review aims to present an overview of the applications, the structural properties, and the green synthesis methods that are used to obtain nanoparticles, and special attention is given to those obtained from metal ions. The review also presents the analytical methods used to analyze, quantify, and characterize these nanostructures.
Ultrasonic Activation of N-arylation of Amines with Aryl Halides Catalysed by Iron (III)
Authors: Said Khemais , Salem Ridha Ben 
Published: May 2021

:A practical and promising protocol was developed for N-arylations of various aromatic amines. This protocol was carried out through the coupling reaction between various aryl halides and phenylboronic acid using iron (III). The processes are efficiently promoted by the catalyst system involving the environmentally benign iron (III) and the state PPh3. The advantages of this method are its versatility, convenient operation and low cost, along with the yields, which are remarkably improved under ultrasonic irradiation, and the high purity of the products obtained. The catalyst can be magnetic recycled via an external magnet and reused several times without considerable loss of its catalytic activity.
Sensors as a Modern Tool for the Detection of Cephalosporin Antibiotics in the Environment: A Short Review
Authors: Asif Muhammad Ibrar , Khan Muhammad Shahzeb , Mustafa Ghulam , Asmatullah  , Ullah Ikram 
Published: May 2021

Background:
Cephalosporin antibiotics are used to treat bacterial infections in humans
and animals. Their excessive usage and massive production rates have led to their presence in the
environment, causing serious threats, such as antibiotic resistance. Several methods have been used
for the detection and quantification of these antibiotic traces in the environment; among them, sensors
have been the most advanced tools that can be very useful for online on-spot detection of these
antibiotics. This review briefly discussed electrochemical, colorimetric and biosensors and their use
in the detection of trace antibiotics. The provided information gives a brief view of the developed
methods that will be helpful in the development of commercially applicable sensing devices for
real-time monitoring of antibiotics in the environment.

Methods:
Research and online content related to the detection of cephalosporin antibiotics were
collected. Research methodologies and results were studied and compared. The screening of available
data was done by experts, and the most advanced and useful methods were described. A brief introduction
to sensing methodologies and the recent advancement in these techniques was reviewed.

Results:
Different analytical techniques have been used for the detection and quantification of environmental
pollutants. Sensors are small-sized devices that have gone through great advancement in
recent decades, have leading to highly sensitive and selective tools for trace antibiotic detection.
Electrochemical sensors have advantages of high selectivity and robust receptors, while colorimetric
sensors provide rapid detection with visible color changes. Biosensors have higher sensitivity
and selectivity but are sensitive to environmental changes. There is a great need to develop a simple
technique that may combine advantages of all these sensing techniques and can be used in the real
world for the screening of antibiotic traces.

Conclusion:
The recent progress in sensing technology has led to the development of highly sensitive
and selective sensors, but they have lab-based applications. We still lack the availability of
sensing methodologies that can provide online monitoring of environmental pollutants in the real
environment. The recent achievements and inter-disciplinary research have been very fruitful and
given hope that we may obtain simple and useful sensing tools for the screening of antibiotic traces
in the environment.
Enhanced Floating and Intragastric Release of 5-Flourouracil through Sesame Oil Entrapped Gellan Composite Hydrogel Beads
Authors: Das Madhurima , Ghosh Balaram , Giri Tapan Kumar 
Published: May 2021

Background:
5-Fluorouracil is an anti-metabolite compound used for several years as
an anti-tumor drug. The development of a gastroretentive drug delivery system of 5-Fluorouracil
may have advantages since they retain in the stomach for an extended time and release the drug in
a sustained manner, which ultimately enhances the absorption of the drug and consequently the
bioavailability.

Objective:
The objective of the present work was to prepare a sesame oil-entrapped gellan gum hydrogel
bead for controlled stomach specific delivery of 5-Fluorouracil.

Methods:
Sesame oil-entrapped gellan gum hydrogel bead was prepared by ionotropic gelation
method. The developed hydrogels were characterized by SEM, FTIR, DSC, and XRD. The entrapment
efficiency, floating ability, swelling and drug release in vitro were also determined.

Results:
Electrostatic interaction between the carboxylic group of polymers and Ca++ was confirmed
by FTIR analysis. The SEM photograph of the hydrogel beads portrayed an approximately
spherical shaped structure. DSC thermogram and XRD spectra exhibited the molecular dispersion
of the drug inside the hydrogel beads. The developed beads of 5-Fluorouracil floated in pH 1.2 buffer
solutions for a prolonged time period and the duration of floating was improved significantly
with increasing the concentration of oil. The developed formulations showed controlled release of
drug and incorporation of oil retarded the release of the drug. Fickian and non-Fickian mechanism
of drug transport was observed from the prepared hydrogel beads.

Conclusion:
Overall, the oil-entrapped gellan matrices could be used for the intragastric delivery
of 5-Fluorouracil to treat stomach cancer.
Shallow crustal structure below Mexico City
Authors: Havskov J. , Singh S. K. 
Published: May 2021

A partir de perfiles directos de refracción sísmica, usando como fuente explosiones de una cantera, se obtuvo una estructura cortical superior de dos capas bajo la Ciudad de México: para la primera capa (2 km de espesor) la velocidad de la onda compresional ἀ}= 2.9 km/seg. y para la segunda capa ἀ2 = 4.7 km/seg. Estos valores corresponden bastante bien a los valores obtenidos; anteriormente en el Lago de Texcoco, usando perfiles cortos de refracción invertidos.
A dipping gradient layer velocity model for southern Mexico
Authors: Drowley D.J. S. , Mcnally K. C. , González Luis 
Published: May 2021

Datos de tiempos de viaje de ondas sísmicas fueron utilizadas,- para estimar un modelo de velocidades para la parte sur de México, en las vecindades de Oaxaca. El 29 de noviembre de 1978, ocurrió un fuerte temblor (Ms=7.8) aproximadamente a 40 km al sur de Oaxaca, en la interfase de subducción de la Placa de Cocos y la Placa de Norteamérica. La red de estaciones permanentes operada por la UNAM y una red local de estaciones operada conjuntamente por la UNAM y CALTECH, registró la secuencia de precursores, el temblor principal y las réplicas. Este conjunto importante de datos ofrece una excelente oportunidad para estudiar las distribuciones espacial y temporal de la sismicidad antes y después de un gran temblor. Sin embargo antes de realizar cualquier estudio detallado. Se requiere un adecuado modelo de velocidades para una capa buzante que asegure una localización confiable de los eventos. Los tiempos de viaje de varios precursores y réplicas bien registrados fueron usados en un proceso un proceso de inversión, utilizando un algoritmo no lineal de mínimos cuadrados; se estimó un modelo de velocidades para una capa buzante con gradiente de velocidades sobre un semiespacio de velocidad constante. Resultados preliminares indican un buzamiento de la interfase de la corteza y el manto de 7° en la dirección N20° E. La profundidad de esta interfase en las cercanías de la costa es de 25km con una velocidad de 8.186 ± 0.48 en el manto.
Gravimetric changes and anomalous variations of the mean sea level during the november 29, 1978 earthquake
Authors: Mena M. , Grivel F. , Monges J. 
Published: May 2021

El Instituto de Geofísica de la UNAM ha realizado medidas de gravedad de primer orden a lo largo de la Costa del Pacífico, entre Lázaro Cárdenas Mich. y Puerto Angel, Oax. Con el objeto de detectar posibles cambios gravimétricos debido a ocurrencia de sismos en esta zona.En este trabajo se comparan las medidas tomadas en los años de 1972, 1976, 1977 y las que se hicieron después del sismo del 29 de noviembre de 1978.También se presenta un estudio anomalías del nivel diario medio del mar (Oh y 2h) previas, al sismo del 29 de noviembre de 1978.
Changing seismicity near the Mid-America Trench
Authors: Wier Stuart 
Published: May 2021

Después de la ocurrencia del temblor de Oaxaca del 29 de noviembre de 1978, ocurrió un número relativamente alto de eventos asociados a la trinchera de América Central. 17 temblores de magnitud Mb≥5.0 fueron registrados por NEIS SGS en los cuatro meses siguientes. Para el período 1969-1979 se tiene en promedio 8.4 eventos/4 meses con una desviación estándar de 3.2; un valor similar se tiene para el período desde 1963 a 1968. Después del temblor de Oaxaca la actividad es superior al promedio, en 2.5 veces la desviación estándar. Esta actividad ocurre a lo largo de toda la trinchera de América central, lo que sugiere que el temblor de Oaxaca originó un cambio en el esfuerzo regional y que éste fue el adecuado para incrementar la sismicidad asociada a la trinchera de América Central. Se sugiere que el tamaño relativamente pequeño de la Placa de Cocos tiene relación con el incremento de la actividad sísmica.
A Word of Caution to Students: Public Accountant Perceptions of Alternative Work Arrangements
Authors: Knight Margaret E. , Taylor Regina M. 
Published: May 2021

ABSTRACT
This study provides updated insights regarding attitudes and beliefs about alternative work arrangements (AWAs) in public accounting so that educators are equipped with current empirical analysis to advise students on how to successfully navigate work-life balance in public accounting. We examine current attitudes and beliefs about AWAs by surveying public accountants from firms of various sizes on different dimensions of AWA support and asking firm partners to provide advice for students. Respondents indicated more agreement with the benefits of AWAs than they did with the perceived costs to the organization and to the participants' future career. Collectively, results suggest attitudes regarding AWAs may be more positive than in the past. Results identify significant differences in the perceptions about AWAs between females and males, as well as AWA participants and nonparticipants. Qualitative results are consistent with general support for AWAs but also provide cautionary advice to students.
Creating a Modified Monopoly Game for Promoting Students' Higher-Order Thinking Skills and Knowledge Retention
Authors: Kuang Tan Ming , Adler Ralph W. , Pandey Rakesh 
Published: May 2021

ABSTRACT
This study modifies a popular business simulation game, Monopoly, to assess its effectiveness as a learning and teaching tool for helping high school accounting students acquire and apply foundational accounting concepts. The study compares an accounting-focused, Modified Monopoly simulation game with two other instructional methods. Using a quasi-experimental approach that involves three learning groups with random assignment of treatments based on school/class, a sample of 144 accounting students was obtained. This study found students using Modified Monopoly showed significantly greater improvement between their pre- and post-test scores than students in Computer-assisted instruction (CAI), but significantly less improvement than a paper-based extended accounting problem (EAP). However, students using Modified Monopoly, similar to CAI students, did not suffer the same significant decay in knowledge as students in EAP. These results offer evidence for the significant and more enduring learning benefits that Modified Monopoly can produce in students' higher-order thinking skills.
Data Availability: Data are available upon request.
Analisa Pemanfaatan dan Peran Software Open-source bagi Mahasiswa Universitas Abdurrab
Authors: Salamun Salamun , Sukri Sukri 
Published: May 2021

Abstract. Analysis of Software Utilization and the Role of Open-source for Abdurrab University Students. Open-source software can be acquired by downloading it for free from the internet, where the software code is published to the public or internet users. Generally, people will fix the software weaknesses and modify its display or language. Then, the repaired software is uploaded and published back to the internet. At the same time, other people will also download this open-source software application and fix other flaws. The purpose of this study was to determine the benefits and roles of open-source software for Abdurrab University students. The results of this study indicate an increase in student interest in using open-source applications and the influence, utilization, and role of open-source software for Abdurrab University students. The conclusion in this study is that open-source software still plays an important role for students because it is very helpful in various aspects to support learning.Keywords: Internet, Software, University of Abdurrab, open-source Abstrak. Open-source software dapat dimiliki dengan cara mengunduh secara gratis dari internet, yang mana kode software dipublikasikan ke publik atau pengguna internet. Umumnya, orang akan memperbaiki kelemahan-kelemahan software tersebut dan memodifikasi tampilan atau bahasanya. Lalu, software yang diperbaiki tersebut diunggah dan dipublikasikan kembali ke internet. Pada saat yang sama, orang lain juga akan mengunduh aplikasi software open-source ini dan memperbaiki kelemahan-kelemahan lain. Tujuan dari penelitian ini adalah mengetahui manfaat dan peran open-source software bagi mahasiswa Universitas Abdurrab. Hasil penelitian ini memperlihatkan adanya peningkatan minat mahasiswa dalam menggunakan aplikasi open-source dan pengaruh, pemanfaatan, serta peran software open-source bagi mahasiswa Universitas Abdurrab. Kesimpulan pada penelitian ini ialah open-source software masih berperan penting bagi mahasiswa karena sangat membantu dalam berbagai aspek untuk mendukung pembelajaran.Kata Kunci: Internet, Software, Universitas Abdurrab, open-source
Penerapan Algoritma Sequential Search pada Aplikasi Kamus Bahasa Ilmiah Tumbuhan
Authors: Rahmanto Yuri , Alfian Joni , Damayanti Damayanti , Borman Rohmat Indra 
Published: May 2021

Abstract. Application of Sequential Search Algorithms in the Plant Scientific Language Dictionary Application. Scientific dictionaries such as plants dictionaries are thick and less attractive. Therefore, it is necessary to develop a scientific language dictionary application for plant which is attractive and can be accessed anytime and anywhere. The dictionary application is closely related to the search feature and the sequential search algorithm is used in the search feature at the application development. This algorithm performs the search by matching data in a row from all existing data. The application built had features such as a list of plants with scientific names equipped with A-Z alphabet menus, plant categories, and a search feature to make it easier for users to find the plant names. The results of the search speed performance test based on page load time with the microtime function show that sequential search algorithms can perform the searches quickly for relatively limited and not too much data.Keywords: Scientific Language Dictionary, Plant Dictionary, Sequential Search Abstrak. Kamus ilmiah seperti kamus ilmiah tumbuhan berbentuk tebal dan kurang menarik. Oleh karena itu, diperlukan pengembangan aplikasi kamus Bahasa ilmiah tumbuhan yang menarik dan dapat diakses kapanpun dan dimanapun. Aplikasi kamus akan berhubungan erat dengan pencarian dan algoritma sequential search digunakan sebagai fitur pencarian pada pengembangan aplikasi kamus bahasa ilmiah tumbuhan ini. Algoritma ini melakukan pencarian dengan mecocokan data secara beruntun dari seluruh data yang ada. Aplikasi yang dibangun memiliki fitur-fitur seperti daftar tumbuhan dengan nama ilmiah yang dilengkapi menu abjad A-Z , kategori tumbuhan, dan fitur pencarian untuk memudahkan pengguna dalam menemukan nama tumbuhan. Hasil pengujian kecepatan pencarian berdasarkan page load time dengan fungsi microtime menunjukkan bahwa algortima sequential search dapat melakukan pencarian dengan cepat untuk data yang relatif terbatas atau tidak terlalu banyak.Kata Kunci: Kamus Bahasa Ilmiah, Kamus Tumbuhan, Sequential Search
Designing User Experience Design of the Healthy Diet Mobile Application Using the Fives Planes Framework
Authors: Agusdin Riza Prapascatama , Salsabila Amira , Kartika Putri Dyah Anggraini 
Published: May 2021

Abstract. Obesity and overweight are becoming increasingly common conditions. On the other hand, the rapid development of technology shows by the increasing number of smartphone users. M-health application can be a solution to the burden of existing health problems. In line with that, the research focused on the quality improvement of user experience in m-Health, especially diet-related apps widely conducted. This study aims to design user experience in a diet-support mobile application called Health-Key using the five planes framework by evaluating usability aspects using the User Acceptance Test. The result of this study is prototype design. Evaluation shows that the designed prototype has good interface, practicality, and efficiency indicator, and 76.9% of respondents stated that the application is feasible, appropriate, useful, and it potentially developed in further iteration with improvements according to the respondents' suggestions.Keywords: m-health, healthy diet, user experience, five planes framework, user acceptance test. Abstrak. Designing User Experience Design of The Healthy Diet Mobile Application Using The Fives Planes Framework. Obesitas dan kelebihan berat badan menjadi kondisi gangguan kesehatan yang umum dialami. Di sisi lain, perkembangan teknologi yang kian pesat ditunjukkan dengan semakin banyaknya pengguna smartphone. Aplikasi M-Health (Mobile Health) dapat menjadi solusi dari beban permasalahan kesehatan yang ada. Sejalan dengan itu, penelitian yang berfokus pada peningkatan kualitas pengalaman pengguna M-Health, khususnya aplikasi pendukung diet, banyak dilakukan. Penelitian ini bertujuan untuk merancang desain pengalaman pengguna dalam aplikasi mobile yang mendukung pola diet sehat bernama Health-Key menggunakan The Fine Planes Framework serta mengkombinasikannya denga mengevaluasi aspek kegunaan dengan User Acceptance Test. Hasil dari penelitian ini adalah desain prototipe. Evaluasi menunjukkan bahwa prototipe yang dirancang memiliki indikator antarmuka, kepraktisan, dan efisiensi yang baik, serta 76,9% responden menyatakan bahwa aplikasi layak, tepat-guna, bermanfaat, dan berpotensi dikembangkan dalam iterasi perancangan lebih lanjut dengan perbaikan sesuai saran responden.Kata Kunci: m-health, healthy diet, user experience, five planes framework, user acceptance test.
Ekstraksi Informasi Terstruktur Profil Pengguna Website Iklan Baris
Authors: Cahyono Nuri 
Published: May 2021

Abstract. Extraction of Structured Information on Classified Ads Website User Profiles. The large amount of user data published on online buying and selling sites provides benefits for research and digital marketing. Data extraction was a method for obtaining data from publicly published website content. The first step was to determine the website category that was needed, then determined the attributes to be used as a reference in compiling the data extraction tags. The next step was to identify the tags that were taken based on the tag elements of the website that matched these attributes. Elements to compile tag extraction included CSS Selector, HTML Tag and Xpath. Based on this, a data extraction code was created with four iterations based on categories. The test was done by calculating the accuracy to find out the complete amount of extracted data. From a total of 16,000 data extracted in this test, the accuracy rate was 99.0625%.Keywords: Data Extraction, Web Scrapping, Classified Ads Abstrak. Perkembangan situs jual beli online berdampak pada banyaknya data pengguna yang dipublikasikan secara online. Profil pengguna situs web memiliki banyak manfaat baik untuk penelitian maupun untuk tujuan dalam pemasaran digital. Ekstraksi data adalah mekanisme untuk mendapatkan data dari konten situs web yang disajikan secara umum. Langkah pertama adalah menentukan kategori website kemudian menentukan atribut yang akan digunakan sebagai acuan dalam menyusun tag ekstraksi data yang diambil berdasarkan elemen tag dari website yang sesuai dengan atribut tersebut. Elemen tag yang diambil untuk menyusun tag ekstraksi antara lain CSS Selector, HTML Tag dan Xpath, kemudian dibuat skenario ekstraksi data dengan skenario empat kasus berdasarkan kategori yang telah ditentukan. Pengujian dilakukan dengan menghitung akurasi untuk mengetahui jumlah data yang berhasil di dapatkan secara lengkap. Dari total 16000 data dari hasil ekstraksi, dalam pengujian ini menghasilkan tingkat akurasi 99.0625%.Kata Kunci: Ekstraksi Data, Web Scrapping, Iklan Baris