bluuebunny/crossref_metadata_2025 huggingface dataset:
Effect Of Investment Knowledge, Motivation, Minimum Capital And Risk Perception On Student Investment Interest In The Faculty Of Economics And Business National University In Capital Markets
Authors: Hasanudin
Published: May 2023

The goal of this study is to disentangle the effects of investing-related knowledge, investment motivation, required starting capital, and perceived risk. In 2019, 453 full-time students and employees enrolled in the Management Study Program participated in this study. This study used a non-probabilistic sampling method called purposive sampling, in which a predetermined set of criteria had to be met in order for the sample of 212 students to be selected. The data in this study was gathered by distributing questionnaires to students using data collection tools. Data analysis techniques such as the use of the Statistical Product and Service Solution (SPSS) software, version 23.0, for descriptive and inferential statistics based on multiple linear regression.  Statistically significant positive effects of motivation, minimum capital, and perception of risk on investment interest were found in this study. This study also found a positive effect of investing knowledge on investment interest, although the effect was not statistically significant.
A Novel Mass Spectrometry Paradigm to Analyze Classical and New Biotherapeutic Modalities
Authors: McCloskey Roxana , Pohl Kerstin
Published: May 2023

Next-generation biotherapeutics are on the rise to address diseases in new and promising ways, and gene-based vaccines offer fast development timelines for combating future pandemics rapidly. At the same time, classical biologics (such as monoclonal antibodies [mAbs]) and new protein modalities continue to be developed to combat diseases such as cancer and chronic inflammatory disease. However, these new biopharmaceutical modalities are introducing unique analytical challenges in the detection and characterization of impurities in lipid nanoparticles (LNPs) for gene therapy and gene-based vaccine products, host-cell proteins (HCPs) in viral vector-based therapies, and post-translational modifications (PTMs) in protein therapeutics. These irregularities could impair the safety and efficacy of novel therapeutics. A new fragmentation approach—tunable electron-activated dissociation (EAD) tandem mass spectrometry (MS/MS)—offers a solution. The tunable energy enables detailed characterization, in an intuitive manner, of lipid impurities, glycopeptides, and other PTMs.
Analysis of PFAS in Locally Acquired Food Containers
Authors: Liguori-Bills Noah B. , Stuart James D. , Ayers Sarah A. , Perkins Christopher R. , Provatas Anthony A.
Published: May 2023

The measurement of intestinal permeability is important for diagnoses of diseases of the gastrointestinal tract, such as Crohn’s disease. The gold standard for measurement of intestinal permeability is the dual sugar absorption test, which measures the urinary or blood concentrations of two orally administered sugars, a monosaccharide and a disaccharide, over a period of time. The lining of the small intestine allows monosaccharides to cross into the bloodstream, but the larger disaccharide is not permitted to cross the intestine unless the barrier is compromised. The permeability of the lining is measured by a ratio between select monosaccharides and disaccharides, and this indicates the overall status of the small intestine. In order to study the effects of resistance exercise on intestinal permeability in human subjects, we developed a liquid chromatography tandem mass spectrometry (LC–MS/MS) method for the analysis of saccharides in blood plasma. The analytes included rhamnose, a monosaccharide not commonly found in food, and lactulose, a disaccharide. A trisaccharide, raffinose, was used as an internal standard. The method was robust, and had consistent reliability.
An LC–MS/MS Method for the Evaluation of Intestinal Permeability in Blood Plasma
Authors: Reynolds Lindsey , Khalil Matthew , Boushra Markous , Townsend Jeremy , Vergne Matthew J.
Published: May 2023

The measurement of intestinal permeability is important for diagnoses of diseases of the gastrointestinal tract, such as Crohn’s disease. The gold standard for measurement of intestinal permeability is the dual sugar absorption test, which measures the urinary or blood concentrations of two orally administered sugars, a monosaccharide and a disaccharide, over a period of time. The lining of the small intestine allows monosaccharides to cross into the bloodstream, but the larger disaccharide is not permitted to cross the intestine unless the barrier is compromised. The permeability of the lining is measured by a ratio between select monosaccharides and disaccharides, and this indicates the overall status of the small intestine. In order to study the effects of resistance exercise on intestinal permeability in human subjects, we developed a liquid chromatography tandem mass spectrometry (LC–MS/MS) method for the analysis of saccharides in blood plasma. The analytes included rhamnose, a monosaccharide not commonly found in food, and lactulose, a disaccharide. A trisaccharide, raffinose, was used as an internal standard. The method was robust, and had consistent reliability.
Simulating the Effectiveness of an IoT Parcel Alert System for Enhancing Delivery Efficiency and Safety During Covid-19
Authors: Zainuddin Ahmad Anwar , Mansor Hafizah , Badrulhisham Nurul Iffah , Zulkifli Nurul Nabilah , Mohd Ridzal Aisyah Afiqah , Ghazalli Nasyitah
Published: May 2023

The Internet of Things (IoT) has revolutionized the way devices communicate and interact with one another. Malaysia has witnessed a substantial increase in online purchasing in recent years. The COVID-19 pandemic and the Malaysian government's mobility control order (MCO) have contributed to the rise in online sales. This circumstance has resulted in a substantial increase in the number of packages that Malaysian delivery firms must manage, producing issues for both homeowners and delivery services. Unattended parcel delivery, parcel loss, and unsuccessful delivery efforts have become widespread. This paper proposes an IoT-based Parcel Delivery Alert System to address the challenges associated with unattended parcel delivery, parcel loss, and failed delivery attempts. The system comprises a parcel safe box that integrates with IoT sensors, such as weight and load sensors, image sensors, and light sensors. The IoT sensors provide real-time information about the delivery status and alert the recipient once the delivery has been made. The system's efficiency and effectiveness were evaluated using the MARS simulator, demonstrating a significant improvement in parcel delivery performance. This paper presents the design, development, and simulation of an IoT-based Parcel Delivery Alert System that can enhance the delivery experience while minimizing delivery-related problems. The paper describes the design and development of the parcel safe box and the eventual evolution of the system. One can acquire access to the safe box by scanning the tracking number on the package's delivery label using a QR code.
XYLAZINE: ZOMBIE DRUG PROVIDES A WAKEUP CALL FOR THE DANGERS OF DRUG ABUSE
Authors: Prajwala Nagarajappa1  , Maneeth Mylavarapu  , Sree Mahathi Chavali
Published: May 2023

Xylazine, the “Zombie Drug, is a scheduled class 3 controlled substance authorized for veterinary use. However, it is now increasingly being used as an adulterant with opioids to intensify their effect. The drug’s ready availability and addictive potential have made it popular among drug users. In our article we have portrayed the implications of Xylazine abuse and the need to be proactive in safeguarding against its abuse. Recent reports have shown a surge in Xylazine use in major cities in the United State causing to emerge as a public health threat. Symptoms include skin ulcerations, rotting, limb amputations, and blackouts. With no readily available antidote, effort must be taken to get the drug off the streets and prevent overdoses. There is a need for rigorous action, increase in budget and personnel to begin to overcome this rapidly rising public health threat.
Penyuluhan Stunting Di Desa Prapag Kidul Kecamatan Losari Kabupaten Brebes
Authors: Rifatul Arozah
Published: May 2023

Stunting adalah kondisi gagal Pertumbuhan pada anak baik itu pertumbuhan tubuh maupuan otak, akibat dari kekurangan gizi kronis. Berdasarkan data Puskesmas Losari beberapa masalah kesehatan yang ada di Desa Prapag Kidul salah satunya adalah stunting sebesar 21,52%. Penyebab adanya stunting berdasarkan faktor yang mempengaruhi yaitu pemberian ASI eksklusif, pengetahuan gizi ibu balita dan tingkat pendidikan ibu balita. Tujuan kegiatan ini adalan untuk mengetahui permasalahan gizi dan mampu memberikan intervensi  gizi yang sesuai dengan permasalahan gizi yang ada di Desa Prapag Kidul Kecamatan Losari Kabupaten Brebes. Metode yang digunakan adalah metode ceramah. Hasil menunjukkan adanya peningkatan pengetahuan ibu yang memiliki balita.
Penerapan Sosial Media Marketing di Era Marketing 5.0 sebagai Solusi Pemasaran pada Usaha Jasa Konstruksi CV Bumi Mandala
Authors: Prakosa Adhi , Farhan Fikri , Agung Nurrohman  , Mukaromatud Daroini  , Rika Kurniasari  , Erni Suwarni  , Tantri Wardani
Published: May 2023

CV Bumi Mandala adalah salah satu perusahaan jasa konstruksi yang menangani berbagai proyek pembangunan, akan tetapi untuk memasarkan jasa perusahaan ini masih menggun akan pemasaran konvensional. Oleh karena itu, tujuan dari pengabdian ini adalah memberikan edukasi, dan pendampingan bagi departemen pemasaran di perusahaan. Pengabdi menggunakan bahan dan metode berupa pengumpulan data dan dokumentasi dengan cara observasi, pembuatan akun media sosial, dan melakukan edukasi penggunaan media sosial ke pihak CV. Bumi Mandala. Tujuan dari pengabdian ini agar pihak perusahaan dapat merancang metode pemasaran digital melalui media sosial.
Pelatihan Dan Pendampingan Akuntansi Berbasis Digital Bagi Pelaku Bisnis Dengan Aplikasi Catatan Keuangan
Authors: Sulistyani Lilis , Lathifah Ifah , Wahyudi Ridwan , Swasti Putri Ika , Suryo Triono Brm.
Published: May 2023

Pengabdian ini bertujuan untuk memberikan pelatihan dan pendampingan bagi pelaku bisnis tentang akuntansi berbasis digital di wilayah Karanganyar, khususnya di dusun Jengglong, desa Waru, kecamatan Kebakkramat, Kabupaten Karanganyar.

Kegiatan pelatihan dan pendampingan proses akuntansi berbasis digital ini dilakukan dengan cara presentasi, diskusi dan simulasi. Sasaran dari kegiatan Pengabdian Kepada Masyarakat ini adalah bagi pelaku bisnis di dusun Jengglong, desa Waru, kecamatan Kebakkramat, Kabupaten Karanganyar. Solusi yang ditawarkan adalah para pelaku bisnis di dusun Jengglong, desa Waru, kecamatan Kebakkramat, Kabupaten Karanganyar sebagai wirausahawan/wirausahawati akan dapat menyusun laporan keuangan sederhana namun sudah berbasis teknologi. Kegiatan ini dimulai dengan membantu dalam memilih aplikasi akuntansi yang cocok, melatih proses pencatatan transaksi sampai dengan penyusunan laporan keuangan berdasarkan aplikasi akuntansi yang akan  digunakan.

Hasil yang diharapkan dari kegiatan ini antara lain para pelaku bisnis di dusun Jengglong, desa Waru, kecamatan Kebakkramat, Kabupaten Karanganyar dapat merekam tiap transaksi melalui aplikasi akuntansi yang akan digunakan sampai dengan menghasilkan laporan keuangan sesuai yang diinginkan. Tindak lanjut dari kegiatan ini yaitu akan dilakukan binaan dan pendampingan berkelanjutan, sehingga peserta pendampingan benar-benar dapat menggunakan aplikasi akuntansi untuk menjalankan bisnis atau usaha mereka secara mandiri.
Update The use of masks by asymptomatic people to reduce transmission of COVID-19
Authors: Moore Gai , Rudge Sian , du Toit Anton , Jameson Brydie , Jenkin Rebekah , Gordon Rebecca , Dhirasasna NiNa
Published: May 2023

This Evidence Snapshot is a July 2020 updated rapid review of knowledge about the use of masks by asymptomatic people to reduce transmission of COVID-19, the original review having been completed in April 2020. The updated review found that, while the evidence was limited and of low certainty, wearing masks in community settings is likely to reduce transmission of COVID-19. Some peer-reviewed studies included other protective measures in their scope, and thirteen of the twenty-eight recommended using masks in combination with these other measures. Where supply of masks is limited, higher risk individuals or residential areas with high transmission rates should be prioritised. A total of fifty-one articles were reviewed: 28 peer reviewed studies and 23 commentary articles and agency reports, with 31 of these articles being new in the updated report.
The use of masks by asymptomatic people to reduce COVID transmission
Authors: Moore Gai , Rudge Sian , Jameson Brydie , du Toit Anton , Taha Haitham , Jenkin Rebekah
Published: May 2023

This Evidence Snapshot found insufficient evidence that masks are effective in reducing transmission among asymptomatic people in community settings. There was a lack of high-level evidence, with small measures of effect found in some studies. However, 10 of the 13 peer reviewed studies held that face masks or coverings may reduce transmission of COVID-19. Six studies recommended facemasks in combination with handwashing and social distancing. Seven studies suggested that masks be worn: early in a pandemic (3 studies), where social distancing is relaxed (1 study), to prevent a second wave (1 study) or where social distancing is not feasible such as on public transport (2 studies). Agency position statements varied.
Arts and health promotion
Authors: Davies Christina , Pescud Melanie
Published: May 2023

A National Arts and Health Framework was endorsed by all Australian states and territories in 2014; acknowledging the role of the arts in contributing to health and wellbeing. This review, commissioned by VicHealth, aimed to identify: effective approaches for improving arts participation (especially in priority groups); programs or activities using the arts which have been effective in increasing awareness, knowledge, attitudes and behaviours in five priority areas; and which of these approaches, programs or activities may be implemented by local councils. The findings will be used to inform future strategic planning and investment for the VicHealth Arts Strategy 2019-2023.
Assessing the availability and efficacy of LGBTQI specific suicide prevention programs
Authors: Melvin GA , Tatnell R , Clancy E , Bush R , Zanetti N
Published: May 2023

This review of the literature on suicide prevention programs targeting people who identify as LGBTQI found scant research in this area. However, the available evidence allows tentative directions to be drawn to guide prevention efforts targeting this group. Studies included in the review looked at legislative initiatives (e.g. same-sex marriage), community programs and therapeutic interventions. Legislation was found to play an important role by promoting equality and prohibiting discrimination and school based programs appear to show promise in reducing suicide among LGBQTI youth. Overall, the review found that more work is needed in developing and evaluating suicide prevention programs for LGBQTI communities.
Suicide Postvention Report
Authors: Andriessen Karl , Krysinska Karolina , Kõlves Kairi , Reavley Nicola
Published: May 2023

Suicide postvention comprises a concerted response to, and provision of care for, people bereaved by suicide including those impacted by the suicide of a family member, friend or person in their social network. Currently, various forms of postvention services are available, such as group support, grief counselling, outreach by agencies and online support. Despite the devastating and lasting effects, a suicide can have on the bereaved and the number of people affected, little is known of what helps bereaved individuals. This review examines what suicide postvention models have been shown to be effective to reduce distress in family, friends and communities following a suicide along with what service components contribute to effectiveness.
Felix Nussbaum und die Holocaust-Kunst
Authors: Kaumkötter Jürgen Joseph
Published: May 2023

Jürgen Kaumkötter zeigt, welche große Bedeutung das als »Selbstbildnis mit Judenpass« bekannt gewordene Werk von Felix Nussbaum für die Holocaust-Kunst hat. Im Jahr 1943 malt der 39-jährige Felix Nussbaum ein kleinformatiges Selbstbildnis. 1944 versteckt er es in einem Depot in Brüssel. 1975 gerät es in die Sammlung des Kulturgeschichtlichen Museums Osnabrück und damit in die Stadt, von der er sich mit diesem Bild entschieden distanzierte. Heute ist das als »Selbstbildnis mit Judenpass« bekannte Porträt eines der berühmtesten Kunstwerke des 20. Jahrhunderts und gilt als Symbol der Verfolgung der Juden Europas. Seine herausragende künstlerische Qualität erfährt jedoch kaum Wertschätzung. Ein ikonographisch-biografisches Deutungsmuster engt bis heute die Wahrnehmung des Malers Nussbaum ein und verstellt den Blick auf das Meisterwerk. Jürgen Joseph Kaumkötter entwickelt auf der Basis seiner langjährigen Forschungen zur Kunst aus dem politischen Territorium der Verfolgung durch das NS-Regime einen neuen methodischen Ansatz zur Beurteilung der Holocaust-Kunst. Eine Rückbesinnung auf vor-ikonologische kunsthistorische Methoden – ohne die »modernen« Techniken zu vernachlässigen – ermöglicht dabei einen freieren Blick auf das Genre. Jetzt ist ein Umdenken über den Umgang mit der Holocaust-Kunst an der Zeit.
Corporate Social Responsibility: The Ethics of Legitimacy
Authors: Onyeyirichukwu Chukwuma Isaac , Ogochukwu Okonkwo Uzoma
Published: May 2023

Organizations are consistently optimizing their opportunities to advance their goals, advantages, and relevance in the global market landscape; among the options utilized in the advancement of such strategic intent are the tool of corporate social responsibility (CSR) as a strategy in social-economic engagement. Notwithstanding the universal applicability of CSR and its benefits to organizations, its engagement still raises subtle curiosity as to the ethics of gaining legitimacy from stakeholders. Hence, this chapter seeks to qualitatively (narrative literature review methodology) explore the dynamics of ethics in legitimacy quest through CSR and makes postulation on the prospect of CSR in sustaining business engagement. The study postulates that the prospect of CSR in its ethical navigation to legitimacy is one in which the government will eventually exercise some level of control and regulations; this is because the organizational quest for legitimacy will no longer be linked to the exclusive consolidation of their economic interest, but may intermediate with other mediating agendas that are of interest to the government and national sovereignty. Hence, an evolving conceptualization of CSR engagements, as organizations begins to explore the avalanche of opportunities they can influence as non-primary actors in sectors that are beyond their economic interest.
Overview of Animal Welfare Aspects of Bali Cattle with Confined Typology in Sumbawa Regency, NTB, Indonesia
Authors: Sudirman Sudirman , Amrullah Amrullah , Hamdani Asrul
Published: May 2023

The quality of life of cattle will affect their productivity, where productivity is an indicator of animal welfare. Sumbawa is one of the national cattle source areas in Indonesia, both as a producer of beef cattle and seed cattle. The research has been carried out using a survey method, collecting data through structured interviews using questionnaires, field observations and the Animal Needs Index (ANI) with 40 respondents. The purpose of the study was to determine the level of welfare of Bali cattle with the Confined typology in Sumbawa Regency. The results showed that the total ANI score in the study area was 15.32, which was included in the almost prosperous category. The recommendation is that it is necessary to improve the aspect of being freedom from discomfort (FDC) and the aspect of being freedom to express natural behavior (FENB) to improve animal welfare through increasing awareness and understanding of farmers and there needs to be government policy intervention in the context of implementing animal welfare in Sumbawa Regency as a efforts to increase the productivity of Bali cattle.
Aiming to Improve Dairy Cattle Welfare by Using Precision Technology to Track Lameness, Mastitis, Somatic Cell Count and Body Condition Score
Authors: Chandra Rai Dinesh , Bhateshwar Vinod
Published: May 2023

Specific animal-based indicators that may be used to predict animal welfare have been at the basis of techniques for monitoring farm animal welfare, such as those developed by the Welfare Quality project. In addition, the use of technical instruments to accurately and immediately measure farm animal welfare is obvious. Precision livestock farming (PLF) has enhanced production, economic viability, and animal welfare in dairy farms by using technology instruments. Despite the fact that PLF was only recently adopted, the need for technical assistance on farms is getting more and more attention and has resulted in substantial scientific contributions in a wide range of fields within the dairy sector, with a focus on the health and welfare of cows. Among the most important animal-based indicators of dairy cow welfare are lameness, mastitis, somatic cell count and body condition, and this chapter aims to highlight the most recent advances in PLF in this area. Finally, a discussion is presented on the possibility of integrating the information obtained by PLF into a welfare assessment framework.
Antioxidant Activity of Nigella sativa Essential Oil
Authors: Sowunmi Kehinde , Kaka Zeenat
Published: May 2023

Nigella sativa oils have anti-inflammatory, antibacterial, antifungal, antiparasitic and antiprotozoal, antiviral, cytotoxic, anticancer, neuro-, gastro-, cardio-, and hepatoprotective properties, making them potential treatments for a wide range of illnesses. N. sativa oil also suggests positive benefits on the immunological, respiratory, and reproductive systems in addition to diabetes mellitus (DM), fertility, breast cancer, dyspepsia, osmotic balance, and other conditions. Thymoquinone (TQ) is a suitable target for its potential antibacterial, antimicrobial, anti-inflammatory, chemopreventive, antitumoral, and other actions among the various isolated chemical moieties. The N. sativa oil has been shown in various non-clinical and clinical investigations to benefit health. On the other hand, TQ in several animal experiments is clear to generate no adverse modifications of the body biomarkers; rather, it enhanced health quality. This study presents a more mechanistic review of the constitutions and oil of N. sativa. In conclusion, research on Nigella oil may represent a health breakthrough.
Reemergence of Sylvatic Dengue Virus in Southern Senegal, 2021
Authors: Dieng Idrissa , Talla Cheikh , Fauver Joseph , Ndiaye Mignane , Niang Sagne Samba , Aliou Barry Mamadou , Faye Ousmane , Alpha Sall Amadou , Faye Oumar
Published: May 2023

As part of the syndromic surveillance of fever in Senegal, the virology department at Institut Pasteur de Dakar (IPD) in collaboration with the Epidemiology Unit and the Senegalese Ministry of Health conducted syndromic surveillance of fever in Senegal. Sample are from all suspected arboviral infections patients attending any of the sentinel sites. Collected blood samples were sent on a weekly basis at WHOCC for arboviruses and hemorrhagic fever viruses for screening of seven medically important arboviruses, including dengue virus (DENV). From January to December 2021, 2010 suspected cases were received among them 124 for confirmed to be DENV+ by RT-qPCR attempt of serotyping led to the detection of atypical DENV case from Sare Yoba area (Kolda region) which is unable to be correctly assigned to a serotype by the available tools (TIB Molbiol Modular Dx Dengue typing kit). Performed genome sequencing et phylogenetic analysis leads to the identification of a sylvatic DENV-2 strain closely related to a virus previously detected in Guinee-Bissau in 2009. This finding constitutes proof of the contemporary circulation of DENV-2 strain belonging to the sylvatic cycle in addition to well-known epidemic strains; this adds a piece of complexity to dengue management in Senegal. Alarmingly, it calls for improved genomic surveillance of DENV to know the genetic diversity of circulating strains in order to strengthen future vaccination policies.
Nghiên cứu đặc điểm tái sinh tự nhiên của cây gỗ trong các ưu hợp họ Dầu (dipterocarpaceae) tại Vườn Quốc gia Cát Tiên, tỉnh Đồng Nai
Authors: Vu Manh
Published: May 2023

Data of this research was collected from 30 typical temporary sample plots with the size of 0.25 hectares. There were 5 sample plots in each Dipterocarpaceae domination. Data categories collected in the Dipterocarpaceae dominations included composition of wooden species height of trees (H < 300 cm) and natural regeneration status under the forest canopy. The data was analyzed and compared by statistical methods in plant community ecology. Research results showed that the lowest regeneration is Hopea odorata (34 species), the highest is in dominations of Dipterocarpus dyeri (54 species). The coefficient of similarity between the regenerated tree composition and the composition of the mother tree was high from 86.3% in the dominations of Anisoptera costata to 96.2% % in the dominations of Dipterocapus alatus. All of them prove that the composition of the tree species of these six plant dominations is stable during development. The dominations of Dipterocarpaceae have the ability to regenerate very well under the forest canopy. Regeneration trees of six dominations of Dipterocarpaceae are predominantly from seeds. Most of regeneration trees were existed at H < 100 cm. Distribution on the ground of regeneration trees of Dipterocarpaceae forms clusters.
Xác định hàm lượng acid perflorooctan sulfonic trong mẫu nước bằng phương pháp sắc ký lỏng khối phổ
Authors: Nguyen Kim Thuy , Han Duy Linh , Nguyen Thi Nang
Published: May 2023

This study used liquid - liquid extraction (LLE) and liquid chromatography Triple Quadrupole Tandem Mass Spectrometry (LC/MS/MS) Agilent 6430 Triple Quad to survey and assessment PFOS contamination in water. The optimistical conditions are: Product ion is m/z = 80 for quantification and m/z = 98.9 to qualifier; collision energy (CE) is 80V, mobile phase is 80% methanol and 20% amonium acetate 5mM. Base on these conditions, PFOS in 1.0 L water is determined by LLE three times with 100 ml DCM. This process has LOD = 0.2 ng/L; LOQ = 1 ng/L; RSD < 21% and recovery > 80%. The results are suitable to requirements of AOAC to analyse PFOS in water samples.
Đánh giá hiệu quả của việc sử dụng chế phẩm sinh học và kháng sinh lên sự sinh trưởng và sức khỏe ấu trùng tôm thẻ chân trắng Lippopenaeus vannamei (Bone, 1931) giai đoạn ấu trùng Nauplinus đến hậu ấu trùng Postlarvae 15
Authors: Nguyen Van Quang , Nguyen Thi Hai Thanh , Tran Quoc Hoan , Le Thi Kieu Oanh , Tran Duc Dien
Published: May 2023

This study presents result from the effects of using probiotics compared with antibiotics on the time of metamorphosis, growth, survival rates, gut microflora and some dangerous diseases (MBV, WSSV, YHV, HPV). After 25 cultured days, time of transition from larvae to postlarvae lowest (in NT2) of nauplius when using probiotics was 211±0.44(h). Growth characteristics of postlarvae total length (PL1) to PL15 in NT2 to 6.6±0.09% (p > 0.05). Growth characteristics of Postlarvae volume PL1 to PL15 in NT2 21.5 ± 0.22%/days were the highest. Survival rate of shrimp from 60.6 to 67% in the treatments by probiotic (p > 0.05). The highest density of bacteria in treatment 2 (NT2) (68,000 ± 5291.5 cfu/PL). By PCR analysis, the appearance of MBV, WSSV, YHV, HPV on all the treated studies was not found. The results demonstrated that probiotics (Viprotech 2ppm, EMT 2ppm, PC2 1ppm) improved the growth of white shrimp in the same period.
Thành phần loài ong ký sinh họ Braconidae (Hymenoptera: Apoidae) trên lúa ở Thái Bình và nghiên cứu một số đặc điểm sinh học của loài Apanteles cypris Nixon, 1965
Authors: Pham Huy Phong
Published: May 2023

This research aims to evaluate the effectiveness of adding earthworm into synthetic feed formula in the period from 25 g/ind to 80 g/ind. The formulas contain 2% enzyme, 48% protein and 6% lipid, earthworm added to the 3 formulas: formula 1: 12%; formula 2: 6% and formula 3: 0%. After 93 days, completed research on synthetic feed formula for eel (Anguilla marmorata) at juvenile of nursery. There is no significant difference in term of death rate between the formulas (average 95%). In term of growth rate, formula 1 leads with 0.632 grams per day and formula 3 performed the worst with 0.568 grams per day. In term of feed conversion ratio (FCR), lowest in formula 1 at 2.42 and highest in formula 3 at 2.71.
Thử nghiệm gia tốc đánh giá độ bền một số loại sơn khi sử dụng trong điều kiện khí hậu nhiệt đới Việt Nam
Authors: Nguyen Hong Phong , Ha Huu Son , Le Quoc Pham , Nguyen Van Vinh , Nguyen Thi Yen
Published: May 2023

This article presents result of accelerated test for determination of decorative and protective properties of five paint coatings made by Institute of Tropical Durability (ITP)/ Vietnam - Russia Tropical Centre. They are: VL-02.VN, XC-567.VN, EP-255.VN, EP-567.VN, EP-730.VN. Herewith, VL-02.VN is a primer, XC-567.VN is used for temporary protection purpose, while EP-255.VN, EP-567.VN, EP-730.VN are protective paints. These paints are intended to be used in the aviation industry. The accelerated test was lasting in 20 cycles, each cycle is equal to 24 hours. This test has been conducted in accordance with 14th method of GOST 9.401 standard, which simulates the operating conditions of paints in naturally ventilation warehouses in tropical region. The protective and decorative properties of tested paints have been assessed after 1, 3, 5, 7, 10, 15 and 20 test cycles according to both GOST 9.407 and TCVN-8785 standards. The test result shows that, the total protective rating of all the coatings (except EP-567.VN paint) is equal to 1.00, that met the requirement of GOST 9.401 standard (required rating is 1.00). So these paints are suitable for using in tropical climatic conditions. In terms of decorative property, paints EP-255.VN and EP-730.VN have a rating of 0.93, that is higher than the required rating (0.9) in relation to GOST 9.401. Paint EP-567.VN had some surface blistering defects that occurred after the 1st test cycle. However, it has been reprepared and re-tested and these defects have not appeared.
Khảo sát bám bẩn hệ Macro theo độ sâu và thời gian tại Trạm Nghiên cứu thử nghiệm biển Đầm Báy
Authors: Nguyen Van Chi , Dong Van Kien , Bui Ba Xuan , Mai Van Minh , Le Hong Quan
Published: May 2023

The initial bio-fouling occurred more favorably in the months from March to September and 2 to 4 times higher than the rest. The testing conditions were most stable at depth of 1.4 m and 2.2 m compared to 0.6 m and 3.0 m. The biomass growth rate was almost linearly observed from 3rd to 7th months, then slowed down and was negligible up to 12th month. The level of bio-fouling in the first 4 months depended on the seasons (biomass of samples have been immersed in September lower than that of samples immersed from April to June). However, after 6 months, this difference is not significant.
Nghiên cứu chế tạo nhựa epoxy biến tính bằng thiokol lỏng dùng để sản xuất keo dán trong ngành hàng không admin
Authors: Do Thi Thuy Trang , Pham Duy Nam , Vuong Van Truong , Hoang Nhu Kha , Mai Thi Nham
Published: May 2023

This study related to polysulfide modified epoxy resins and developing an adhesive from this modified resin. The composition comprises the copolymerization product of epoxy resin with polysulfide and polyester acrylate. Some mechanical properties of obtained adhesive has been enhanced such as tensile strength, chemical resistance and adhesion. The tested results have shown that the working life of the obtained adhesive is 125 mins, the tensile strength is 115 kgf/cm2, watter and oil resistances are good level. Such adhesive can be useful in a wide variety of application such as electrical and aviation adhesives.
Kết quả nghiên cứu hậu quả chất da cam/dioxin đối với sức khỏe con người của Trung tâm Nhiệt đới Việt – Nga giai đoạn 1988 – 2022
Authors: Trinh Khac Sau , Vo Viet Cuong
Published: May 2023

During the period 1988 - 2022, the Joint Vietnam - Russia Tropical Science and Technology Research Center conducted the studies on the long-term biomedical consequences of Agent Orange/dioxin in Vietnam on many groups of subjects with different exposure levels including people residing and living in herbicide sprayed areas and areas around dioxin hotspots, veterans exposed to Agent Orange/dioxin during the war in the southern battlefield, and northern residents after the war migrated to areas sprayed with herbicides. The current status of effects of Agent Orange/dioxin on human health has been reviewed. The research results have provided scientific recommendations, opening the prospect for finding methods to protect people against dioxins and other persistent organic pollutants, effectively addressing the social problems associated with losses in health and quality of life. The long-term biomedical consequences of Agent Orange/dioxin for humans are still unpredictable, especially exposure at low doses and at trace concentrations. Therefore, it is necessary to further study the risks of ecotoxicants at low doses, and the changes in homeostasis and health of people residing and working in areas contaminated with Agent Orange/dioxin, including in secondary contaminated areas.
Xác định đồng thời hàm lượng một số vitamin nhóm B bằng phương pháp điện di mao quản sử dụng detector độ dẫn không tiếp xúc (CE-C4D)
Authors: Dang Thi Huyen My , Nguyen Quang Huy , Mai Thi Thanh Tam , Le Duc Dung , Pham Hoang Nguyen , Pham Thi Quynh , Nguyen Thi Minh Thu , Nguyen Thi Anh Huong
Published: May 2023

The simultaneous determination of vitamin B1, vitamin B5, and vitamin B9 in dietary supplements was investigated by using capillary electrophoresis with capacitively coupled contactless conductivity detection (CE-C4D). Optimal conditions included: fused silica capillary inner diameter (ID) 50 µm and total length of 50 cm (effective length of 30 cm); electrolyte solution of 12 mM Arginine/Acetic acid/ 10% Acetonitrile; pH = 7.5; hydrodynamic injection at height of 15 cm in 30 s; separation voltage of 17 kV. Calibration curves were constructed over the range from 1.0 to 100 ppm (vitamin B1) and 2.0 ppm to 100 ppm (vitamin B5, vitamin B9) giving good linear correlation coefficients (R2 > 0.999). The limits of detection (LOD) for vitamin B1, B5 and B9 were 0.3, 0.5 and 0.6 ppm, respectively. The recoveries were ranging from 94.9% to 105.0%. The developed method was applied to simultaneously determine vitamin B1, B5 and B9 in 4 dietary supplement samples. The results of these vitamins in the samples differ from their labels by -11.67% to +12.50%. The CE-C4D results were compared with those obtained by reference UPLC-MS/MS method, showing good agreement between the two methods (relative error < 10.53%).
Hiệu quả kết hợp sóng ngắn, xoa bóp bấm huyệt, điện châm và kéo giãn cột sống trong điều trị thoát vị đĩa đệm cột sống thắt lưng
Authors: Phung Quang Tung , Tran Danh Tien Thinh
Published: May 2023

Objectives: To evaluate the effectiveness of treatment of lumbar disc herniation of grades I, II, and III by shortwave therapy, acupressure massage, electro-acupuncture, and traction therapy. Methods: Controlled clinical trial on 105 patients with lumbar disc herniation grade I, II, and III identified on MRI (35 patients in each group) treated at the Join Vietnam-Russia Tropical Science and Technology Centre from April 2021 to May 2022. Results: The time treatment average of the group using a combination of shortwave therapy, acupressure massage, electro-acupuncture, and traction therapy (NC1) was 17.6 days, which was shorter than that of the NC2 group 3.29 days (95%CI: 1.74 - 4.74) and shorter than time treatment of the NC3 group 5.57 days (95%CI: 3.5 - 7.56). After the intervention, the study group's VAS, and ODI indexes improved better than the control group (p<0.01). The NC1 group had a lower risk of pain recurrence than the NC2 group, and the NC3 group (p<0.05). Conclusion: The four treatment methods reduced treatment duration, improved pain symptoms, better disability, and a lower risk of pain recurrence after treatment.
Chế tạo và khảo sát sự ảnh hưởng của hàm lượng paladi trong vật liệu tổ hợp Pd/γ-Al2O3 đến khả năng chuyển hóa khí CO ở nhiệt độ phòng
Authors: Ha Ngoc Thien , Vu Tran Duong , Nguyen Hung Thai , Nguyen Huu Dong , Vuong Van Truong , Nguyen Thi Quynh Nga
Published: May 2023

This study presents the results of fabrication Pd/γ-Al2O3 by the chemical co-precipitation method. The results showed that the CO conversion speed and efficiency of Pd/γ-Al2O3 (3%Pd) were many times higher than Pd/γ-Al2O3 (2,5%PD) and Pd/γ-Al2O3 (2%Pd). For the first 1500 seconds compared to ФК-П catalyst, the CO conversion speed of Pd/γ-Al2O3 (3%Pd) was 8% higher. To consider the microstructure, FE-SEM and XRD measurements were also carried out.
Nghiên cứu, chế tạo cặp màng lọc tích điện trái dấu từ graphen oxit hấp phụ ion Na+ và Cl-
Authors: Le Hong Quan , Nguyen Van Chi , Cao Nhat Linh , Dong Van Kien , Nguyen Nhu Hung
Published: May 2023

In this research, we fabricate pairs of oppositely charged graphene oxide (GO) membranes (negatively charged n-GO and positively charged p-GO) with efficient cation or anion selectivity. The fabricated primary GO membrane carries a negative charge (n-GO). The positively charged p-GO membrane was prepared by ultrasonic stirring with polyethyleneimine. The electrical properties of the n-GO and p-GO films were examined based on a fluorescence electron microscope and zeta potentials in NaCl solution at different concentrations and times. The results show that the zeta potential of n-GO and p-GO both stabilize and maintain their charge properties in NaCl solution. The good ion selectivity of n-GO and p-GO was determined by X-ray spectroscopy (EDX) mapping.
Nghiên cứu tổng hợp poly-β-pinen khối lượng phân tử thấp và khảo sát một số tính chất cơ bản
Authors: Nguyen Thi Hong Ngoc , Dang Minh Thuy
Published: May 2023

In this study, low-molecular-weight polyterpene was synthesized from the β-pinene monomer by controlled polymerization in the presence of Lewis Acid. The structure of the resulting polyterpene was determined by 1H and 13C nuclear magnetic resonance (NMR) and Infrared (IR) Spectroscopy. Gel permeation chromatography (GPC) showed the polyterpene product with a molecular weight of 890 and PDI of 1.48 due to the polymer synthesis. Differential scanning calorimetry (DSC) of the resulting polyterpene shows a melting point in the range of -3 to -15°C and a crystallization point in the range of -25 to -30⁰C. In addition, this study proved that the breakdown voltage, dielectric dissipation factor, washout resistance, acid number of the obtained polyterpene are suitable for making protective coatings for electrical and electronic equipment.
Mối quan hệ giữa hàm lượng nhóm isocyanat trong prepolyme với một số tính chất của lớp phủ polyurea
Authors: Dao Kien Cuong , Nguyen Van Vinh , Dang Minh Thuy
Published: May 2023

Polyurea is prepared from a prepolymer based on isophorone isocyanate and a polyamine mixture, a volume ratio and molar ratio of NCO:NH2 = 1:1. The relationship between the content of NCO group in the prepolymer and some physicomechanical properties of polyurea has been studied; when the NCO group content decreases, the elongation increases, the hardness and tensile strength decrease, is caused the influence of the soft segment (PPG) in the prepolymer when the soft segment increases, the polyurea film becomes more flexible and elastic.
Nghiên cứu chế tạo vật liệu compozit nền đồng gia cường bằng vật liệu graphen sử dụng phương pháp luyện kim bột
Authors: Pham Van Trinh , Tran Bao Trung , Luong Van Duong , Tran Van Hau , Nguyen Van Toan , Nguyen Van Tu , Doan Dinh Phuong
Published: May 2023

Copper/graphene (Cu/Gr) composite materials containing 1%vol. graphene (Gr) was successfully fabricated by powder metallurgy method using isostatic hot pressing technique. The morphological and structural analysis showed that the composite material has a relatively homogenous structure. The influence of Gr reinforcement on the mechanical properties and wear behavior has been studied. Experimental results show that when the Gr component is reinforced, the hardness and tensile strength of Cu/Gr composite increase by 46% and 79% higher than that of Cu, respectively. Similarly, the coefficient of friction and wear rate of Cu/Gr composite materials are reduced to 28% compared to Cu materials. Thus, the Gr material has demonstrated the ability to improve the mechanical properties and wear resistance of Cu-based composites. This result opens up the applicability of this composite in applications in modern industries such as automobiles, electricity, and electronics.
Nghiên cứu chế tạo vật liệu graphen từ graphit bằng thiết bị rung siêu âm mật độ công suất lớn
Authors: Nguyen Hai Yen , Mai Thi Phuong , Tran Van Hau , Nguyen Cao Khang , Nguyen Viet Dung , Nguyen Thi Ngoc Tu , Au Thi Hang , To Anh Duc , Pham Van Trinh , Doan Dinh Phuong , Phan Ngoc Minh , Vu Thi Thu Ha , Bui Hung Thang
Published: May 2023

This paper presents an environmentally friendly and efficient method to prepare graphene from graphite, in there a high-powered ultrasonic vibration device is used to separate graphite into graphene in a liquid. During exfoliation, ultrasonic waves provide mechanical energy to break Vander Walls bonds in order to split graphite layers into graphene. Graphene was prepared by the exfoliation of graphite layers in distilled water with Tween 80 surfactant and then the solvent was vibrated at high power for 1 to 5 hours. The obtained results show that high-frequency ultrasound is a powerful tool to break Vander Waals bonding forces between adjacent layers in graphite. The SEM and ZetaSizer distribution results show that with the average size of 931 nm, 419 nm, 411 nm, 408 nm, 317 nm, the ultrasound time is 1 hour, 2 hours, 3 hours, 4 hours, and 5 hours, respectively. The TEM and Raman results show that the graphene material has a thickness of about 3 nm corresponding to the number of layers less than 10 as low-layer graphene. These results show that high-frequency ultrasonic waves not only reduce the average size, but also separate graphite layers, forming graphene.
Nghiên cứu chế tạo vật liệu hấp thụ khí CO2 sử dụng trong quốc phòng và dân sinh
Authors: Tran Danh Tuan , Vu Thi Trang , Nguyen Ba Cuong , Vu Van Thuy , Duong Minh Tuan , Vu Ngoc Doan
Published: May 2023

Generally, absorbent materials play an important significant in the military and civilian fields, especially the absorbing carbon dioxide materials. The composition and characterization of the material have been determined in this study, then the procedure to manufacture the carbon dioxide-absorbing material based on the hydroxide was stalished, which is similar to Sofnolime products in UK and determined some technical standards. Besides that, this study investigated the effects in the absorption of carbon dioxide of material in the static system and dynamic system, evaluated the absorbent ability of the material.
Nghiên cứu tổ chức, độ cứng và độ bền ăn mòn của thép 30XH3A sau khi thấm nitơ thể lỏng QPQ
Authors: Doan Thanh Van , Nguyen Van Anh , Vu Van Huy , Nguyen Van Thanh , Hoang Thanh Long , Nguyen Thi Thu Xuan
Published: May 2023

This article presents the results of research on the microstructure, surface hardness, and anti-corrosion properties of 30XH3A steel treated by salt bath nitriding QPQ. Microstructure analysis and microhardness profile of case depth showed that the nitrided layer formed quite quickly, the thickness reached 250 μm after 2 nitriding hours, and the surface hardness was 774 HV1. Experimental results of the salt spray test during 196 hours and the electrochemical corrosion test showed that the salt bath nitriding QPQ significantly improved the corrosion resistance of the 30XH3A steel.
Đánh giá khả năng chống ăn mòn của màng (Ti, Cr)N được chế tạo bằng phương pháp hồ quang cathod (arc-PVD) trên nền thép SS304
Authors: Vu Van Huy , Rodionov N.B. , Doan Thanh Van , Nguyen Van Thanh , Ngo Thanh Binh , Le Ngoc Quyen , Hoang Thanh Long , Nguyen Van Hinh
Published: May 2023

The monolayer (TiN/Ti), multilayer single-component (Ti/TiN; Ti/CrN) and multilayer multicomponent (Ti/TiN/CrN; Ti/CrN/TiN) films were deposited on SS304 steel by cathodic arc deposition method with an average thickness of 2300 nm. Research results showed that many macro particles (peaks) and holes (valleys) appeared and evenly distributed on the surface, the monolayer film had better quality (Ra = 0,08-0,1 µm) than the multilayer film (Ra = 0,1÷0,2 µm), but the adhesion to the substrate was poor. X-ray diffraction spectroscopy recorded the preferred orientation (111) with monolayer films and switched to (200) with multilayer films. The corrosion potential and current of the fabricated films were both reduced compared to the SS304, but in the multilayer films, the expansion of the passive regions was recorded: -0,2÷0,6 V (Ti/TiN/CrN Ti/CrN/TiN) and -0,2÷0,2 V (TiN/Ti, CrN/Ti).
PEMANFAATAN BAN BEKAS UNTUK PERKUATAN STRUKTUR JALAN PADA PELEBARAN JALAN SOROWAKO – MALILI: SEBUAH KAJIAN TENTANG KESTABILAN GEOTEKNIK
Authors: Haryanto Wiyatno , Rohaendi Nendi , Banda Ridwan , Zakaria Zufialdi
Published: May 2023

PT Vale Indonesia Tbk. adalah bagian dari Vale S.A. (Brazil) di bawah Vale Base Metal (Kanada) yang terletak di daerah Sorowako, Kabupaten Luwu Timur, Provinsi Sulawesi Selatan, Indonesia. Sebagai Perusahaan Modal Asing (PMA) dalam industri tambang yang bergerak pada bidang eksplorasi, penambangan, pengolahan, dan produksi nickel matesebagai produk baku. Tulisan ini dimaksudkan untuk mengenalkan konsep 3R (reuse, reduce, recycle) sebagai konsep yang ramah lingkungan melalui pemanfaatan ban-ban bekas sebagai bahan konstruksi alternatif untuk tujuan rekayasa geoteknik. Kestabilan geoteknik dari struktur dinding penahan tanah dari tumpukan ban-ban bekas dianalisis untuk memperoleh faktor keamanan dan keandalan stuktur tersebut untuk diterapkan dalam proyek pelebaran jalan. Dalam operasi pertambangan, PT Vale Indonesia Tbk. mengonsumsi ban-ban untuk kebutuhan alat-alat berat seperti truk-truk pengangkut dan wheel-loader. Konsumsi ban untuk operasional pertambangan tersebut berfluktuasi antara 350–600 buah per tahun bergantung pada faktor-faktor teknis, seperti kondisi permukaan perkerasan jalan, geometri jalan, frekuensi pengereman, beban muatan, dan lain-lain. Penggunaan ban dalam jumlah yang cukup besar masih menjadi kendala dalam hal penyediaan disposal untuk tempat pembuangan ban-ban bekas tersebut. Sampai saat ini, ban-ban bekas selalu dibuang percuma ke suatu disposal yang seolah-olah sebagai sampah yang tidak berguna. Pemanfaatan ban bekas sebagai bahan untuk perkuatan struktur jalan adalah sebagai salah satu solusi teknis. Tentunya dibutuhkan analisis kestabilan geoteknik dari struktur dinding penahan tanah untuk mendapatkan nilai faktor keamanan serta penggunaan dalam jangka waktu yang lama. Hasilnya adalah bahwa pemanfaatan ban bekas untuk perkuatan struktur jalan telah memenuhi persyaratan teknis untuk penggunaan jangka panjang, yakni faktor keamanan sebesar 1,46 tanpa beban gempa dan 1.04 dengan beban gempa.