bluuebunny/crossref_metadata_2025 huggingface dataset:
Pengaruh Literasi Keuangan Dan Kepercayaan Terhadap Minat Penggunaan Shopee Pay Later
Authors: Aurin Rizkiza , Kusumastuti Ratih
Published: January 2024

In the 2022 digital literacy report, Shopee has become the number one choice for online shopping in Indonesia with a market share of approximately 3.37%. Technological breakthroughs like SPayLater have provided convenience and trust to consumers in financial transactions. This research aims to evaluate the relationship between financial literacy and the level of trust among students and their interest in using SPayLater services. The research method used is an associative research method that focuses on exploring the relationship between financial literacy, trust levels, and interest in using SPayLater. The primary data was collected through a questionnaire distributed via Google Form, with a total of 50 respondent samples. The research results indicate that financial literacy and trust levels have a positive and significant impact on the interest in using SPayLater, emphasizing the importance of financial literacy and trust in promoting the use of financial technology like SPayLater.
Analisis Penetapan Harga Jual Dan Volume Penjualan Dalam Upaya Meningkatkan Laba Pada CV.Wecono Asri
Authors: Srikalimah Srikalimah , Dinnana Putri Zabita , Antasari Dewi Wungkus
Published: January 2024

In general, every company has a goal to be achieved, namely increasing profit, so that the company is able to maintain viability and expand its business. Efforts that can be made by the company is to set the right selling price and increase sales volume. This study aims to determine the right product selling price and sales volume in an effort to increase profit. The data used in this study is primary data and the method used is descriptive quantitative with data collection techniques in the form of interviews and documentation.

Based on the results of research and data analysis, it can be concluded that the selling price set by the company is smaller than the selling price calculated using the cost plus pricing selling price method. The selling price set by the company is Rp. 200,000 with a profit of Rp. 19,650,000, while the determination of the selling price calculated by the researcher using the method of determining the selling price of cost plus pricing is Rp. 229,553 and a profit of Rp. 38,207,750. The total sales volume in 2021 is also not maximized, which results in inappropriate profits. The acquisition of sales volume in 2021 is 642 units, the company wants maximum profit, therefore the company must obtain a sales volume of 1,393 units in order to obtain maximum profit.
PENGARUH CORPORATE GOVERNANCE DAN LEVERAGE TERHADAP AGENCY COST PADA PERUSAHAAN FOOD BEVERAGE BURSA EFEK INDONESIA
Authors: Dinisafitri Ervi Siska , Rahayu Puji , Kusumaningarti Miladiah
Published: January 2024

Konflik kepentingan yang terjadi pada perusahaan antara pihak principal dan juga pihak agen, akan menimbulkan adanya biaya keagenan perusahaan yang besar. Biaya tersebut tentunya akan merugikan perusahaan secara financial, untuk itu perusahaan haruslah menggurangi biaya keagenan supaya perusahaan dapat berjalan dengan efisien. Tujuan dari penelitian ini adalah mnegetahui apakah corporate governance dan leverage perusahaan bisa menyelesaikan masalah biaya keagenan atau agency cost.

Penelitian ini adalah penelitian deskriptif dengan pendekatan kuantitatif dengan tujuan menganalisa, menjelaskan, dan menyimpulkan mengenai pengaruh corporate governance dan leverage terhadap agency cost. Teknik pengumpulan data dalam penelitian ini adalah berupa dokumentasi laporan keuangan perusahaan food & beverage yang terdaftar di BEI 2019-2021. Teknik analisis yang digunakan dalam penelitian ini adalah berupa, Uji Asumsi Klasik, Uji Regresi Linier Berganda dan Uji Hipotesis.

Hasil penelitian ini menunjukan corporate governance berpengaruh terhadap agency cost, hal tersebut disebabkan corporate governance yang baik akan menjadikan perusahaan berjalan efisien dan pemborosan akan semakin ditekan agency cost berkurang. leverage tidak berpengaruh terhadap agency cost. Hal tersebut disebabkan rasio hutang yang kecil pada sampel penelitian ini menjadikan leverage tidak berpengaruh terhdap agency cost. Secara simultan variabel ukuran corporate governance dan leverage tidak berpengaruh terhadap variabel agency cost.
Analisis Penerapan Pajak Tangguhan atas Implementasi PSAK 71 tentang Instrumen Keuangan (Studi Kasus pada PT Putra Jaya Nanas)
Authors: Safitri Era , Isnaniati Siti , Awalina Putri
Published: January 2024

ABSTRAK

PSAK 71 merupakan standar akuntansi terbaru yang dikeluarkan oleh DSAK/IAI pada  1 Januari 2020. PSAK 71 memperbarui beberapa poin pada PSAK sebelumnya diantaranya yaitu mengenai klasifikasi dan pengukuran atas aset keuangan berdasarkan model bisnis dan arus kas kontraktual aset keuangan, memperkenalkan metode expected credit loss sebagai metode menghitung penurunan nilai serta memperbaiki akuntansi untuk lindung nilai. Dalam penerapannya PSAK 71 akan memunculkan pengakuan penyisihan kerugian piutang. Dalam perpajakan hal tersebut akan menimbulkan kontra yang mana akan muncul perbedaan pengakuan beban dan pendapatan yang berbeda dari kebijakan akuntansi. Perbedaan pengakuan tersebut akan memunculkan jumlah laba / rugi yang berbeda antara ketentuan fiskal dan akuntansi komersial yang mana akan menimbulkan adanya pajak tangguhan.

 

Kata kunci: PSAK 71, Penyisihan Kerugian Piutang, Pajak Tangguhan.

 

 

ABSTRACT

PSAK 71 is the latest accounting standard issued by DSAK/IAI on January 1st 2020. PSAK 71 updates several points in the previous PSAK, there are classification and measurement of financial assets based on the business model and contractual cash flows of financial assets, introduces expected credit loss as the methods of calculating impairment and improving hedging accounting. In practice PSAK 71 will be subject to the recognition of allowance for losses on receivables. In the case of taxation, it will create a contra which will lead to differences in the recognition of expenses and income that are different from the accounting policies. The acknowledgment of this recognition will result in a different profit/loss amount between the fiscal provisions and commercial accounting which will result in a tax deferred.

 

Keywords: PSAK 71, Allowance for losses on receivables, Deferred Tax.
PERBANDINGAN BIAYA TENAGA KERJA LANGSUNG BERDASARKAN JAM KERJA DAN UNIT PRODUKSI GUNA MENINGKATKAN LABA
Authors: Zain Irfan Mahfudh , Sahara Khasanah , Agustin Beby Hilda
Published: January 2024

Perusahaan meningkatkan laba dengan penghematan biaya produksi melalui metode pengupahan karyawan, seperti perbandingan biaya tenaga kerja berdasarkan jam kerja dan unit produksi. Tujuan penelitian ini adalah untuk mengetahui dan mendeskripsikan perbandingan biaya tenaga kerja langsung berdasarkan jam kerja dan unit produksi guna meningkatkan laba

Pendekatan penelitian ini adalah deskriptif dengan tujuan menganalisa, menjelaskan, dan menyimpulkan mengenai analisis perbandingan biaya tenaga kerja langsung berdasarkan jam kerja dan  unit produksi guna meningkatkan laba pada UD. Dian Coklat Kediri. Teknik Pengumpulan data dalam penelitian ini adalah berupa dokumentasi, wawancara. Teknik Analisis dalam penelitian ini adalah deskriptif kuantitatif.

Hasil menunjukan metode unit produksi menghasilakan biaya upah setiap unit produknya adalah sebesar Rp. 628.60, dengan banyaknya produksi produk permen coklat sebesar 316.415 unit prroduksi. Besarnya biaya tenaga kerja dengan menggunakan metode unit produksi sebesar Rp. 190,328,973.03, dan mengakibatkan besarnya harga pokok produksi perusahaan sebesar Rp.764,950,693 dan laba kotor yang dihasilkan oleh perusahaan juga sebesar Rp. 255,554,307. Metode penentuan biaya tenaga kerja langsung berdasarkan  jam kerja dan juga biaya unit produksi, terdapat selisih sebesar Rp. 9,341,027. Selisih tersebut mempengaruhi perbedaan biaya tenaga kerja langsung, harga pokok produksi dan laba kotor yang dihasilkan perusahaan. Hasil tersebut akan menjadikan perusahaan semakin optimal dan efisien dalam menghasilkan laba.
Analisis Biaya Produksi Dalam Menentukan Harga Jual Bagi Usaha Meubel
Authors: Mahardika Mahardika , Naruli Akhmad , Selviasari Rike
Published: January 2024

Penelitian ini membahas tentang biaya produksi dalam menentukan harga jual pada PB Meubel Kediri di Kecamatan Purwoasri, Kabupaten Kediri. Jenis penelitian adalah penelitian kuantitatif deskriptif. Data yang digunakan yaitu data primer yang diperoleh langsung dari hasil wawancara serta informasi biaya produksi perusahaan selama bulan mei 2022. Sedangkan data sekunder diperoleh dari dokumentasi, skripsi, dan jurnal. Berdasarkan analisis data yang dilakukan, bahwa penentuan harga jual yang dilakukan oleh PB Meubel Kediri dengan penentuan harga jual yang dilakukan peneliti menggunakan metode full costing terdapat perbedaan atau selisih dalam penentuannya. Harga jual yang dihitung oleh perusahaan untuk ke-empat jenis sofa yaitu Sofa L Rp. 2.801.000, Sofa Alexa Rp. 2.937.000, Sofa Minimalis Rp. 2.887.000 dan Sofa L Mini Rp. 2.675.000. Sedangkan harga jual yang dihitung dengan metode full costing untuk ke-empat jenis sofa yaitu Sofa L Rp. 2.800.000, Sofa Alexa Rp. 3.000.000, Sofa Minimalis Rp. 2.950.000, dan Sofa L Mini Rp. 2.650.000. Jadi, penentuan harga jual produk yang dilakukan oleh perusahaan PB Meubel Kediri belum terlalu baik dimana perusahaan hanya menghitung biaya-biaya yang dikeluarkan selama proses produksi tanpa memasukkan biaya listrik, biaya penyusutan peralatan dan biaya pemeliharaan sehingga penentuan harga jual produk perusahaan PB Meubel Kediri dikatakan belum efektif dalam penentuan harga jual produknya.
Praesalide E, a new phenolic compound from the lichen Parmotrema praesorediosum (nyl.) Hale
Authors:   Department of Nature, Dong Nai University, Bien Hoa City, Dong Nai Province, Vietnam, Huynh Bui Linh Chi , Nguyen Thi Anh Tuyet ,   Department of Chemistry, Ho Chi Minh City University of Education, Ho Chi Minh City, Vietnam, Vo Thi Nga ,   University of Technology and Education Ho Chi Minh City, Vietnam, Pham Nguyen Kim Tuyen ,   Faculty of Environmental Science, Sai Gon University, Ho Chi Minh City, Nguyen Thu Thi-Hoai ,   University of Medicine and Pharmacy at Ho Chi Minh City
Published: January 2024

Introduction: Parmotrema praesorediosum (Nyl.) Hale is widely distributed in the south of Vietnam. To contribute to finding new compositions as well as increasing the phytochemical knowledge of Parmotrema species from which we could further study to find some new biologically potential compounds, we have done systematic research on Parmotrema praesorediosum growing in Vietnam, and we have been reported twelve novel phenolic compounds. This paper reported the isolation and structural determination of two compounds as the result of the continuous study on the chloroform extract of Parmotrema praesorediosum. Method: The crude extract was obtained by the maceration method of dried power of Parmotrema praesorediosum lichen in methanol. This extract was then separated by the solid-phase extraction and eluted with petroleum ether, chloroform, ethyl acetate, acetone, and methanol in turn to give the corresponding extracts. Two compounds were isolated from chloroform extract by silica gel column chromatography. Their chemical structures were determined by the NMR and HR-ESI-MS data analysis. Moreover, the chemical structure of 1 was also deduced from its methylated product. The cytotoxicity of compound 2 against HeLa, NCI-H460 and, MCF-7 cell lines was done using the Sulforhodamine B method. Results: Two isolated compounds, consisting of praesalide E (1) and usenamin A (2), and one methylated product from 1 were identified. Compound 2 showed no toxicity against all three tested cell lines at the concentration of 100 microgam/mL. Conclusion: To the best of our knowledge, 1 was a new compound, and compound 2 was known to present in Parmotrema genus for the first time.
Roadmap, routing and obstacle avoidance of AGV robot in the static environment of the flexible manufacturing system with matrix devices layout
Authors:   School of mechanical engineering, Hanoi University of Science and Technology, Vietnam, Nguyen Hong Thai , Ly Thi Khanh Trinh ,   Faculty of Automation Technology, Electric Power University, Ha noi, Vietnam, Le Quoc Dzung ,   Faculty of Automation Technology, Electric Power University, Ha noi, Vietnam
Published: January 2024

In Flexible Manufacturing Systems (FMSs), Automated Guided Vehicles (AGVs) are considered an important element of the manufacturing system. The positioning system of the AGV robot is increasingly intelligent to integrate with manufacturing systems and through an IoT connectivity to find its path and flexibly avoid obstacles without the need for a fixed traditional navigation system. In order for the AGV robot to find its own path and avoid obstacles when required, robots are often equipped with a navigation system to know its current position in the system and compare with the roadmap installed on the robot's controller. To deal with this problem, this paper presents the method to build a robot's roadmap in a flexible manufacturing system where devices are arranged in a matrix style. On that basis, we have developed an algorithm for optimal routing and static obstacle avoidance based on the Dijkstra algorithm. A Matlab computation and simulation program has been written according to the algorithms of this study to explore different scenarios in the production line.
Effects of pressure angle on uneven wear of a tooth profile of an elliptical gear generated by ellipse involute
Authors:   School of Mechanical Engineering, Hanoi University of Science and Technology, Nguyen Hong Thai , Phung Van Thom ,   School of Mechanical Engineering, Hanoi University of Science and Technology, Lam Bao Dang ,   School of Mechanical Engineering, Hanoi University of Science and Technology
Published: January 2024

This paper presents a method to establish a mathematical model of an elliptical gears pair's tooth profile slip curve. The gear has an ellipse involute tooth profile generated by a rack cutter. The profile equation was developed based on the gearing theory with centrodes and center distance and consideration to conditions for avoiding undercutting. An elliptical involute curve and design parameters of the rack cutter were established corresponding to different points on the centrode of the elliptical gear. The profile equation was developed based on the theory of gearing with given centrodes and axis distance and consideration to conditions for avoiding undercutting. An elliptical involute curve and design parameters of the rack cutter determined corresponding to different points on the centrode of the elliptical gear. Wrote a number calculation program was in Matlab to examine and select appropriate pressure angles to limit the slippage between the mating teeth, to reduce wearing and enhance the lifespan of the elliptical gear pair. Case studies were also presented to confirm the influence of the pressure angle on the profile slippage phenomenon and select the rack cutter's pressure angle to reduce uneven wearing between the teeth of one elliptical gear. The survey results show that when the pressure angle of the rack cutter is large, the profile wear will occur faster since the ramp tooth rib, shorter length of the line of action, and pointed tooth tip. These research results are meaningful in selecting the rack cutter's pressure angle to gear the non-circular gear has tooth profile is an involute ellipse curve.
Prevalence of depression among students of Doctor of Physical Therapy (DPT) in Swabi and Peshawar; a cross sectional study
Authors:   Department of Physical Therapy and Rehabilitationat, NCS University, Swabi, Pakistan, Hayat Khizar , Umar Farooq Hazrat ,   Department of Physical Therapy and Rehabilitationat, NCS University, Swabi, Pakistan, Ahmad Uzair ,   Department of Rehabilitation Sciences, Northwest Institute of Health Sciences, Peshawar, Pakistan, Ul Abidin Syed Zain ,   Department of Rehabilitation Sciences, Northwest Institute of Health Sciences, Peshawar, Pakistan; Institute of Physical Medicine and Rehabilitation, Khyber Medical University Peshawar, Pakistan, Ahmad Zahoor ,   Department of Physical Therapy and Rehabilitationat, NCS University, Swabi, Pakistan, Afnan Zavata ,   Department of Physical Therapy and Rehabilitationat, NCS University, Swabi, Pakistan, Kazmi Abeer ,   Department of Biotechnology, Faculty of Chemical and Life Sciences, Abdul Wali Khan University Mardan (AWKUM), Mardan 23390, Pakistan
Published: January 2024

Background: Depression is among the most prevalent forms of mental diseases; 4.5% of the world's population is believed to be depressed. Depression is very common among university students as they undergo a significant transitory period from adolescence to adulthood. Factors such as difficulties in learning, maintaining good grades, preparing for the future, and adjusting to life in a hostel, cause significant levels of anxiety and depression among university students. This study aimed to evaluate the vulnerability to depression among final year DPT (Department of Physical Therapy) students in various medical institutes of Peshawar and Swabi, using BDI (Beck’s depression inventory scale). Methodology: A simple quantitative cross-sectional survey was conducted at the medical colleges of Peshawar and Swabi. A convenience sampling technique was used in the current study. The sample size was 145, calculated by the Raosoft sample size calculator. Only the students of the final year of physical therapy were included in the current study. Exclusion criteria comprised of students belonging to departments other than DPT, students who had any physical disabilities, and those who had any psychological problems. Data was collected through a structural questionnaire administered to all participants. Result: It was found by using BDI Scale that 44.8% of students had borderline clinical depression. About 19.3% were suffering from moderate depression and 2.8% were suffering from severe depression. The students of Khyber Medical University reported higher levels of borderline clinical depression compared to the other institutes. Conclusion: Our study reported that an average number of students experienced borderline clinical depression, while a small percentage of participants suffered from severe depression. Females were seen to be more affected than males. Moreover, students of the Institute of Physical Medicine and Rehabilitation (IPMR), KMU, Peshawar reported higher rates of depression compared to other DPT colleges.
The Impact Of Covid_19 On Child Labor In Vietnam
Authors:   PhD Student at VNUHCM-University of Economics and Law, Tran Ha Nguyen Quang ,   Faculty of Law – Nguyen Tat Thanh University (331 Quoc lo 1A, An Phu Dong ward, District 12, Ho Chi Minh city)
Published: January 2024

In recent years, Vietnam is joining hands with various international organizations to eliminate child labor and achieve certain results. However, such results are being threatened by the severe effects of acute respiratory infections caused by the new strains of coronavirus (COVID-19). The COVID-19 pandemic has forced countries around the world, including Vietnam, to take instantaneous action to protect children from child labor and sustain national efforts to abolish it. By researching different studies, this article will suggest some ideas that conform with Vietnam's policy to combat child labor.
The rate of convergence in the central limit theorem via Zolotarev probability metric
Authors:   University of Finance and Marketing, Ho Chi Minh City, Vietnam, Phan Tri Kien , Tran Loc Hung ,   University of Finance and Marketing, Ho Chi Minh City, Vietnam
Published: January 2024

The central limit theorem is a well-known theorem in probability theory. It is the theoretical basis for constructing statistical problems such as parameter estimation problems and statistical hypothesis testing, etc. The main aim of this article is to estimate the upper bound in the central limit theorem for independent but not necessarily identically distributed random variables under Lyapunov's conditions via the Zolotarev probability metric. The obtained result is the rate of convergence in the central limit theorem for independent random variables. In the case of independent identically distributed random variables will be concluded as a direct corollary. The Zolotarev probability metric is the main research tool in this paper since it is an ideal metric of order s > 0. Furthermore, the Zolotarev probability metric may be compared with well-known metrics like the Kolmogorov metric, total variation metric, the Levy-Prokhorov metric, and the metric based on the Trotter operator, etc.
Immobilization of green fluorescence and lipase proteins in porous silica nanoparticles to improve their bioluminescence and catalytic activity
Authors:   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam, Vu Khanh Bao ,   Vietnam National University, Ho Chi Minh City, Vietnam, Phung Khoa Thanh ,   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Le Thong Hoang ,   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Tong Khoa Dang ,   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Hoang Huy ,   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Bui Linh Thi ,   School of Biotechnology, Department of Chemical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam
Published: January 2024

Introduction: The GFP and lipase proteins have been immobilized in the aminated silica nanoparticles through encapsulation and ionic interaction. The synthesis of porous silica nanoparticles and amination of silica surface were simultaneously performed in a water-in-oil emulsion. Methods: The materials have been characterized by zeta potential measurements, electron transmission microscopy, and fluorescence spectroscopy. The reaction mixture was analyzed by gas chromatography equipped with a mass selective detector. Results: The aminated-silica nanoparticles with a positive zeta potential interact with GFP having a negative zeta potential via ionic force. GFP immobilized by the aminated silica nanoparticles greatly enhances (ca. 2 times) the bioluminescence intensity compared to free GFP. The lipase/aminated-silica nanoparticles catalyzed the transesterification reaction of 1-hexanol and ethyl acetate. This catalyst shows better activity than free lipase and remains catalytic activity over at least eight catalytic cycles in an organic solvent. Conclusion: The result shows that the immobilization of proteins in the aminated-silica nanoparticles improves their bioluminescence and catalytic activity.
Effects of the hybrid plasmonic Ag/SrTiO3 nanocubes for efficient photo-catalytic of H2 generation and RhB decomposition
Authors:   Faculty of Physics and Physics Engineering, University of Science, Ho Chi Minh City 700000, Vietnam, Ton Nu Quynh Trang ,   Vietnam National University, Ho Chi Minh City 700000, Vietnam, Le Lam Anh Phi ,   Faculty of Physics and Physics Engineering, University of Science, Ho Chi Minh City 700000, Vietnam; Vietnam National University, Ho Chi Minh City 700000, Vietnam, Le Thi Ngoc Tu ,   Dong Thap University, Cao Lanh City, Dong Thap Province 870000, Vietnam, Vu Thi Hanh Thu ,   Faculty of Physics and Physics Engineering, University of Science, Ho Chi Minh City 700000, Vietnam; Vietnam National University, Ho Chi Minh City 700000, Vietnam
Published: January 2024

Introduction: Designing a novel photocatalyst toward the photo-catalytic degradation of dye molecules and hydrogen evolution reaction (HER) based on semiconductors has been drawn enormous attention as a potential strategy in the clean energy field and environmental treatment. Herein, a SrTiO3 (STO) nanocubes decorated with co-catalysts Ag nanoparticles (NPs) for H2 generation and organic dye Rhodamine B (RhB) photodegradation activity under UV and visible light irradiation was fabricated. Method: The crystallinity, morphology, and chemical components of the photocatalyst were characterized through X-ray powder diffraction (XRD), scanning electron microscopy (SEM) equipped with energy-dispersive X-ray spectroscopy (EDX), respectively. The optical properties were evaluated through the UV-Visible absorbance spectra. Results: As a result, the photo-catalytic performance of the obtained Ag/STO hybrid photocatalyst was higher than that of the pristine STO nanocubes due to i) the efficient charge separation and transfer of photogenerated electron-holes pairs; ii) the improvement of the light-harvesting efficacy in the visible light. The high photo-catalytic RhB decomposition of the achieved Ag/STO hybrid photo-catalytic was obtained compared to the pure SrTiO3 nanocubes under UV and visible light exposure. The H2 generation of Ag/STO photocatalyst was 2- and 12-time higher than that of the pure STO nanocubes under UV and visible light illumination, respectively. Conclusion: This study gives a general strategy for photocatalyst design towards water splitting for photo-catalytic H2 evolution and environmental deterioration.
Home-made in vitro magnetic nanoparticle-based gene delivery system
Authors:   School of Biotechnology, International University, Ho Chi Minh City, Vietnam, Pham Tuan Huy ,   Vietnam National University, Ho Chi Minh City, Vietnam, Nguyen Pham Quynh Anh ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Tong Thi Hang ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Nguyen Hoang Khue Tu ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Le Minh Thong ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Nguyen Van Thuan ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh City, Vietnam, Tran Yen Thi Hai ,   School of Biotechnology, International University, Ho Chi Minh City, Vietnam; 2Vietnam National University, Ho Chi Minh City, Vietnam
Published: January 2024

Introduction: Biotechnology applications of Magnetic Nanoparticles (MNPs) have been rapidly investigated and are becoming the leading trend in the field. Although making an appearance almost 20 years ago, gene delivery using magnetic nanoparticles has not achieved much significant success. This study aims to establish promising and simple MNP-based protocol for gene delivery initially. Specifically, we aim to evaluate whether sodium chloride (NaCl) could enhance gene transfer with naked plasmid DNA without the need to combine liposomes or polymersomes. Methods: In this work, our "homemade" MNPs were mixed with plasmid DNA (phEF1-hKO – which expresses orange fluorescence) under various treatments of NaCl to enhance the formation of MNP-DNA complex for transfection. Then, these complexes were added to cultured cells. Delivery efficiency was represented by fluorescent expressing cells. Results: NaCl facilitated the magnetofection process in a dose and treatment duration co-dependent manner. Initial data showed that the optimal condition was 150mM NaCl with a 40-minute duration. Conclusion: Our homemade gene delivery system based on magnetic nanoparticles was established successfully. The viability of cells in magnetofection was maintained. Magnetofection without liposomes and polymersomes is certainly possible, but further researches have to be carried out in order to tell the definite optimal conditions.
Rapid sex determination of preimplantation bovine embryo using direct-PCR from a single blastomere
Authors:   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Trong Thoai Quang , Pham Truong Duy ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Nguyen Nhat Thinh ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Vinh Thinh ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietn, Pham Quoc Dinh ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Pham Minh Chien ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Nguyen Ngoc Thuy Tram ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Tran Hai Yen ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Nguyen Van Thuan ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam, Le Thong Minh ,   School of Biotechnology, International University - Vietnam National University HCMC, Ho Chi Minh 700000, Vietnam
Published: January 2024

Introduction: Sex control plays an indispensable role in livestock farm management. It enables farmers to quickly respond to the needs of herd rearrangements such as size and composition, and stably maximize the economic value, particularly on long gestation period animals as bovine. Despite being an invasive method, genetic examination of blastomeres isolated from the preimplantation embryos provides a superior accuracy method for bovine sexing, particularly with a highly sensitive molecular technique such as PCR. Currently, this technique is commercially expanding due to many improvements in embryo technology. In this study, we attempted to reduce the embryonic invasiveness and develop a simple, fast, and reliable sexing procedure using direct amplification of Y chromosome-specific marker from only one blastomere. Methods: The bovine sexing was carried out using direct PCR of Y chromosome amplicon from single blastomeres biopsied from sex-known somatic nuclear transfer technology (SCNT) embryos (male) and enucleated metaphase II nucleus (female). The intensity of the amplified products was also optimized using the PCR additive. Results: Utilizing the protocol resulted in the success of sex typing for all tested samples in this study that are comparable with genomic DNA amplification. Conclusion: Our result could serve as a fast procedure for bovine embryo sexing and would be an effective tool for sex ratio control in the husbandry industry, animal embryo research, and endangered animal preservation.
Evaluating two conceptual hydrological models: LST and NAM
Authors:   Faculty of Environment, University of Science, 227 Nguyen Van Cu, District 5, Ho Chi Minh City, Vietnam, Nguyen Thi Thuy Hang ,   Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam, Pham Ba Tuan ,   Faculty of Environment, University of Science, 227 Nguyen Van Cu, District 5, Ho Chi Minh City, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam, Duong Thi Thuy An ,   Faculty of Environment, University of Science, 227 Nguyen Van Cu, District 5, Ho Chi Minh City, Vietnam; Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam, Nguyen Tra Quynh Nga ,   Vietnam National University Ho Chi Minh City, Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam; Faculty of Civil Engineering, Ho Chi Minh City University of Technology (HCMUT), 268 Ly Thuong Kiet Street, District 10, Ho Chi Minh City, Vietnam
Published: January 2024

Rainfall-runoff models are essential applications for water resources researches. A large number of models have been proposed and developed. Comparisons among models are helpful for researchers to have better choices for their studies of catchment water researches. This study focused on performance evaluations, and comparisons between the LST and NAM lumped conceptual rainfall-runoff models. Two models were applied to simulate runoffs of three catchments in the upper Dong Nai river basin: Phuoc Hoa, Ta Pao, and Phu Hiep. We used the data from 1984-1988 and 1989-1991 to calibrate and validate the Phuoc Hoa catchment, respectively. Those for Ta Pao and Phu Hiep catchments were 1988-1996 and 1997-1999. The results showed that both models performed well in the catchment monthly runoff simulation with NSE and R2 values greater than 0.90 for Phuoc Hoa and Phu Hiep stations and greater than 0.87 for Ta Pao station. The NSE and R2 by daily runoff simulations for Phuoc Hoa and Phu Hiep were approximate 0.90 except for the Phu Hiep runoff by the NAM model. That for Ta Pao was approximate 0.80. The obtained RSR and PBIAS are respectively lower than 0.50 and 10.00% in almost all simulations. Significantly, the LST model resulted in relatively better statistical performances than the NAM model in almost all statistical fitness values. The study would provide a noteworthy introduction of a good runoff simulation tool to hydrological studies in the future.
Camptothecin can increase the quantity of apoptotic bodies in a conditioned medium from human umbilical cord-derived mesenchymal stem cell culture
Authors:   Laboratory of Stem Cell Research and Application, University of Science, Viet Nam National University, Ho Chi Minh City, Viet Nam, Huynh Phat Duc ,   Viet Nam National University, Ho Chi Minh City, Viet Nam, Nguyen Vy Quang ,   Laboratory of Stem Cell Research and Application, University of Science, Viet Nam National University, Ho Chi Minh City, Viet Nam; Viet Nam National University, Ho Chi Minh City, Viet Nam, Nguyen Sao Thi ,   Stem Cell Institute, University of Science, Ho Chi Minh City, Viet Nam; Viet Nam National University, Ho Chi Minh City, Viet Nam, Le Thuan Minh ,   Laboratory of Stem Cell Research and Application, University of Science, Viet Nam National University, Ho Chi Minh City, Viet Nam; Viet Nam National University, Ho Chi Minh City, Viet Nam, Vu Ngoc Bich ,   Stem Cell Institute, University of Science, Ho Chi Minh City, Viet Nam; Viet Nam National University, Ho Chi Minh City, Viet Nam
Published: January 2024

Introduction: Recent studies have demonstrated that extracellular vesicles, particularly apoptotic bodies (ABs) from mesenchymal stem cells (MSCs), play an important role in MSC-mediated immune regulation. However, studies on the apoptosis and ABs of umbilical cord mesenchymal stem cells are still limited. This study aimed to investigate the effects of camptothecin on increasing ABs in a conditioned medium consisting of a human umbilical cord-derived mesenchymal stem cell (hUCMSC) culture. Methods: hUCMSCs were cultured in an expansion medium supplemented with 5 µM camptothecin (apoptosis inducer). The ABs were isolated using the centrifugation approach. The shape of the ABs was confirmed by reverse microscopy and the size of the collected population was confirmed using a particle size analyzer. The protein concentration of ABs was quantified using the Bradford assay. Apoptotic cells and ABs were stained with an optimized procedure using a FITC Annexin V/Dead Cell Apoptosis Kit, and the fluorescent signal was analyzed using ImageJ software and flow cytometry. Results: The protein concentrations of the ABs obtained in a conditioned medium without and with camptothecin after 48 h were 3.933 ± 0.037 µg and 5.567 ± 0.072 µg, respectively. The fluorescence signal analysis also showed that the number of apoptotic bodies also increased from 24 h (14.87 ± 1.84%) to 96 h (36.3 ± 3.99%). Conclusion: The results show that camptothecin can trigger hUCMSC apoptosis and increase the number of ABs in the conditioned medium. This research is a foundation for further studies into apoptosis and ABs in hUCMSCs.
Associating demographic, clinical, and radiological presentation of HIV patients with TB and other co-infections in KPK, Pakistan
Authors:   State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Hubei, China, Shereen Muhammad Adnan , Bashir Nadia ,   State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Hubei, China, Kazmi Abeer ,   Department of Biotechnology, Faculty of Chemical and Life Sciences, Abdul Wali Khan University Mardan (AWKUM), Mardan 23390, Pakistan, Qazi Hina Gul ,   Department of Microbiology, Shaheed Benazir Bhutto Women University, Peshawar, Pakistan, Hassan Syeda Mehreen ,   State Key Laboratory of Virology, College of Life Sciences, Wuhan University, Hubei, China, Shabbir Kiran ,   Department of Nursing, Shifa Tameer-e-Millat University, Islamabad, Pakistan, Parveen Azra ,   Department of Nursing, Shifa Tameer-e-Millat University, Islamabad, Pakistan, Imtiaz Hamna ,   Department of Nursing, Nishtar Medical University, Multan, Pakistan, Bashar Said ,   Department of Nursing, Shalamar Institute of Health Sciences, Lahore, Pakistan, Khalid Madiha ,   Department of Nursing, Allama Iqbal Medical College, Lahore, Pakistan
Published: January 2024

Background: The human immunodeficiency virus (HIV) afflicts the immune system by annihilating the white blood cells. The infection of HIV can alter the epidemiology and clinical profile of tuberculosis (TB) in patients suffering from co-infection. The objectives of the current study were to demographically and retrospectively analyze the data of HIV-infected patients admitted to different hospitals at KPK, Pakistan, and elaborate the key radiological and clinical differences in HIV positive patients with various co-infections and their effect on the CD4 level. Methodology: Initially, 1057 patients with HIV admitted to different hospitals of KPK were assessed for clinical presentation, co-infections, and their correlation with CD4 level. The data of patients, including date of hospital registration, weight, gender, diagnosis, age, and therapy, were obtained using a specifically designed Performa. In addition, sputum test of HIV patients was also conducted for screening of TB. Results and Conclusion: Our main findings are that HIV makes TB more severe such that CD4 count cell reduces to a level of 82-120 (killer stage). The incidence of HIV is two times greater in the males of the population under study. Young, single, and illiterate males were more affected by HIV and TB due to sexual contact and injecting intravenous drugs by contaminated syringes. Radiography was abnormal and pulmonary TB was common in HIV-positive TB patients. Co-infection of HIV and TB significantly reduced CD4 cells level in patients. The majority of HIV patients were Afghan refugees or those who came to Pakistan for better treatment.
Dynamic Analysis of Axially Loaded Beams Partially Supported by an Elastic Foundation Under a Moving Harmonic Load
Authors:   Thuyloi University, 175 Tay Son, Dong Da, Hanoi, Viet Nam, Bui Van Tuyen
Published: January 2024

In this paper, a first-order shear deformable beam element is formulated and employed to study the dynamic behavior of beams partially resting on a Pasternak elastic foundation subjected to an axial force and a moving harmonic load. The beam element is derived by using the solution of differential equilibrium equations of a beam segment to interpolate the transverse displacement and rotation. The dynamic response of the beams is computed with the aid of the Newmark method. A parametric study is carried out to highlight the effects of the moving load parameters, the axial force amplitude, and the foundation support on the dynamic characteristics of the beams. The obtained result reveals that the axial force and the moving velocity have an important role in the dynamic behavior of the beams, and the influence of the axial force on the dynamic behavior of the beam is dependent on the excitation frequency.
The suitable distribution area of artichoke (Cynara scolymus L.) in the Hoang Lien Son Mountain range (Lao Cai Province)
Authors:   Department of Ecology, VNU University of Science, No.334 Nguyen Trai str., Thanh Xuan district, Hanoi, Truong Ngoc Kiem , Nguyen Ngoc Cong ,   Department of Ecology, VNU University of Science, No.334 Nguyen Trai str., Thanh Xuan district, Hanoi
Published: January 2024

Hoang Lien Son is a high, rugged mountain range in the northwest region of Vietnam where many ethnic minorities gather, and due to socioeconomic characteristics, the life of the people here still faces many difficulties. Artichoke is a medicinal plant with high economic value and favorable growth in temperate climates and is one of the options for sustainable economic development for people in mountainous areas. The study used a multicriteria analysis method on AHP to analyze the influence of ecological factors of the Hoang Lien Son area (Lao Cai Province) on the growth and development of artichokes. The weights from the AHP model are used to establish ecological adaptation maps through geographic information system (GIS) software. The research results show that the most suitable areas (S1 and S2) for the development of artichokes have an area of 125,642.72 hectares, accounting for 34.41% of the study area. However, the area with the highest adaptability (S1) for growing artichokes is not large, located at an altitude of over 1000 m, mainly at 1700 m in the territory of Sapa town and some communes in Bat Xat district. The results provide the scientific basis for planning potential planting areas and exploiting and developing artichokes to improve livelihoods and people's lives, contributing to biodiversity conservation and sustainable development.
Synthesis of TeO2 nanoparticles by tellurium oxidation in NH4OH and their infrared sensing properties
Authors:   School of Engineering Physics, Hanoi University of Science and Technology, No. 01 Dai Co Viet, Hai Ba Trung, Hanoi, Dang Duc Vuong , Vu Xuan Hien ,   School of Engineering Physics, Hanoi University of Science and Technology, No. 01 Dai Co Viet, Hai Ba Trung, Hanoi
Published: January 2024

Tellurium oxide is an interesting semiconductor metal oxide with a variety of fascinating photoelectric properties. The method of thermal oxidation of tellurium metal in air was used to make TeO2 nanowires and rods. This paper introduces a facile method to synthesize TeO2 nanoparticles directly from tellurium powder in NH4OH solution. The TeO2 nanoparticles are monodisperse, uniform and high density. The growth mechanism of the TeO2 nanoparticles was proposed and debated. This material has a good ability to absorb infrared light with a wavelength of 800 nm. The infrared photosensing properties of this nanomaterial were investigated and compared to those of recent studies.
DFT insight into the high stability of single Pt atoms on the CeO2(111) surface
Authors:   The University of Danang, University of Science and Technology, 54 Nguyen Luong Bang, Da Nang City 550000, Vietnam, Ho Thang Viet , Hop Quy Van ,   The University of Danang, University of Science and Technology, 54 Nguyen Luong Bang, Da Nang City 550000, Vietnam, Pham Thong Le Minh ,   Institute of Research and Development, Duy Tan University, Da Nang City 550000, Vietnam; Faculty of Environmental and Chemical Engineering, Duy Tan University, Da Nang, 550000, Vietnam
Published: January 2024

Introduction: Single Pt atom catalysts supported on CeO2(111) surfaces have attracted considerable attention in recent years due to their high reactivity and selectivity in important reactions, such as water–gas shift reactions for hydrogen production and CO oxidation. However, the geometrical and electronic structure of Pt/CeO2(111) at the atomic level is still not clearly understood. In this study, we aim to gain insight into the geometrical and electronic structure of a single Pt atom on the CeO2(111) surface. Methodology: Various single Pt atom species, including (Pt)ads, (PtOH)ads, (PtO)ads, (PtO2H2)ads, (PtO2)ads, (Pt)subCe, and (Pt)subO, deposited on the CeO2(111) surface were investigated by the DFT+U method with dispersion corrections. Furthermore, the CO molecule was adopted to evaluate the electronic structures of these single Pt atoms. In addition, the supported Pt3 cluster was applied as a metallic model to distinguish it from single Pt atom models. Results: By comparing the CO adsorption properties of single Pt atom models and Pt3 cluster models to those of experimental observations in the literature, the stretching frequency of CO on (PtO2)ads species agrees well with the experimental results, while the frequencies of CO on other single Pt atom structures and on Pt3 clusters largely differ from the experimental results. Conclusion: Based on the DFT calculated results, we conclude that the activity and high stability of single Pt atom species that were observed from the experiment are formed via the interaction between Pt and two extra O atoms on the CeO2(111) surface.
All-graphene-based transparent and flexible ultraviolet photodetectors
Authors:   VKTech Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Vietnam, Nguyen Hung Hoang , Huynh Tran My Hoa ,   VKTech Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Vietnam, Pham Phuong Hoai ,   VKTech Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Vietnam, Dang Quang Vinh ,   Department of Materials Science and Technology, University of Science, Ward 4, District 5, Ho Chi Minh City, Vietnam; Vietnam National University, Ho Chi Minh (VNU-HCM), Linh Trung Ward, Thu Duc District, Ho Chi Minh City, Vietnam, Tran Viet Cuong ,   VKTech Research Center, NTT Hi-Tech Institute, Nguyen Tat Thanh University, 298-300A Nguyen Tat Thanh Street, Ward 13, District 4, Ho Chi Minh City, Vietnam
Published: January 2024

The excellent electrical and optical properties make graphene suitable for transparent conductive electrodes in optoelectronic device applications. However, the lack of an energy bandgap of graphene has caused many obstacles in practical applications. To overcome this issue, graphene-based semiconductor heterojunctions have been proposed, but challenges still remain due to the chemically inert surface of graphene, which causes many difficulties in forming a junction. We have proposed an alternative strategy based on chemically modified graphene architecture in this context. This combination creates a novel platform based entirely on graphene material so that it can perfectly connect together. All-graphene-based transparent ultraviolet photodetectors comprised of a reduced graphene oxide layer and graphene quantum dots have been manufactured and tested. Under a 2 V applied voltage and 380 nm illumination wavelength, this structure has a responsivity of 2 A/W with a rise/decay duration of 100 s.