bluuebunny/crossref_metadata_2025 huggingface dataset:
The role of grandparents in the transition to parenting: a scoping review
Authors: Sousa Inês , Bértolo Maria Helena
Published: November 2023

Introduction The transition to parenthood involves a set of intra and interpersonal changes, which affect not only the woman and her partner, but also the entire family system. Grandparents are highlighted as prominent figures in the contemporary family, constituting the main source of support for the family in this process. Therefore, it is extremely important to understand how grandparents can influence or not the transition to positive parenting, acting as facilitating agents or as hinderances in this process. Objective To map the available scientific evidence regarding the role of grandparents in the transition to parenthood of their children, encompassing the period of pregnancy, childbirth and the postpartum period up to 3 years. Methods This scoping review was developed according to the methodology of the Joanna Briggs Institute (JBI), 2020, with research carried out in April and May 2022 and updated in July 2023. Qualitative, quantitative or mixed studies were included, as well as review articles, published in English and produced between 2015 and 2023. This scoping review includes articles that address the role of grandparents in the context of the transition to parenting of their children, including the time of pregnancy, childbirth and the postpartum period up to 3 years. Results 11 articles that met the inclusion criteria were included. Four categories emerged: grandparents as a source of support; grandparents and their influence on family nutrition and exclusive breastfeeding; the ambivalence of feelings and the role of health professionals. Conclusion Grandparents can stand out as prominent elements of the family during the transition to parenting of their children, developing instrumental, emotional, informational and financial support roles; may influence exclusive breastfeeding and family nutrition. When concepts and beliefs about fundamental aspects relating to children differ, ambivalent feelings can arise and that lead to intergenerational conflicts. There is a gap in health care regarding the inclusion of meaningful people in the care of the couple and the child, in this case the grandparents.
Pengaruh E-Procurement dan Whistleblowing System terhadap Pencegahan Fraud Pengadaan Pemerintah Kabupaten Banyuasin
Authors: Hasanah Adelia Nur , Maria Maria , Oktarida Anggeraini
Published: November 2023

Penelitian ini bertujuan untuk mengetahui pengaruh e-procurement dan whistleblowing system terhadap pencegahan fraud pengadaan pemerintah Kabupaten Banyuasin. Populasi dalam penelitian ini adalah seluruh Organisasi Perangkat Daerah (OPD) yang berjumlah 51 OPD (menggunakan sampel jenuh). Teknik pengumpulan data menggunakan kuesioner dengan responden para pelaku pengadaan (PPK, POKJA Pemilihan, dan Pejabat Pengadaan). Data dianalisis dengan teknik regresi linier berganda menggunakan SPSS versi 25. Hasil penelitian menunjukkan e-procurement dan whistleblowing system berpengaruh positif dan signifikan terhadap pencehagan fraud pengadaan sebesar 64,8%. Secara parsial, e-procurement dan whistleblowing system juga berpengaruh terhadap pencegahan fraud pengadaan. Whistleblowing system lebih dominan mempengaruhi pencegahan fraud pengadaan dibandingkan dengan e-procurement.
Analysis of the Jigsaw Learning Model on Pancasila Implementation Material From Time to Time Phase D in the Independent Curriculum
Authors: Putri Liana Anisa , Murdiono Mukhamad
Published: November 2023

This study aims to analyze the Jigsaw learning model in the form of a sub-chapter of the material Implementation of Pancasila from Time to Time Phase D in the Independent Curriculum. This research uses the method of literature study or literature review using content analysis to better understand and interpret a study. The results showed a model that is very suitable for use in learning outcomes in the form of subchapters, namely the material Implementation of Pancasila From Time to Time Phase D. The jigsaw model makes students work hand in hand in mastering the material and encourages student activity in order to achieve maximum results. Each member or individual is taught to take responsibility for the submaterial they obtain. Students have independent responsibilities and teach students to communicate well, therefore this model emphasizes the development of civic knowledge citizenship aspects. Then the benefit of this model is to prevent competition and increase collaboration as contained in the independent curriculum.
Income Smoothing Practices in Animal Feed Sub-Sector Companies Listed on the Indonesia Stock Exchange For the 2020-2022 Period
Authors: Afiffah Junita Nur , Martin Boyke , Ramadhaningsih Devi , Samuel Binsar , Ramadhan Yanuar , Atthariq Muhammad
Published: November 2023

This study aims to analyze Income Smoothing practices in animal feed sub-sector companies with a focus on the financial implications of using the eckel index during the period 2020 – 2022. The sample used is animal feed sub-sector companies in the basic industrial and chemical sectors listed on the Indonesia Stock Exchange, there are 5 companies. Based on calculations using the eckel index derived from the financial statements of each company, This research shows that there are 4 companies that do profit smoothing and 1 company that does not do income smoothing.
Xenophon
Authors: Nickel Rainer
Published: November 2023

Born around 425 BC, the Athenian Xenophon lived through the most exciting period in Athenian history. A versatile student of Socrates, he spent much of his life in exile. He worshipped the Spartan king Agesilaos and glorified Persian culture, which he visualised in his major work, the Cyropaedia. In Xenophon, the modern reader encounters a personality whose linguistic skills and achievements make him a model for non-violent conflict resolution in various situations in life. His political and economic experience and his proposals for resourceful land use make him a serious interlocutor even today.
The Effect of Emotional Freedom Techniques on Sleep Quality, Sleepiness and Quality of Life of Older Adults in Adult Day-Care Center
Authors: Ghoreishi Seyedeh Sahar , Pourhadi Samaneh , Hosseini Seyed Reza , Hamidia Angela
Published: November 2023

Background: Various physical and mental problems and diseases may develop with aging. Poor sleep quality is the third most common major problem in older adults, affecting all aspects of life. Emotional Freedom Techniques (EFT) can be used to treat the disease in older adults. Objectives: This interventional study attempted to investigate the effect of EFT on sleep quality, sleepiness, and quality of life of older adults. Methods: This was a quasi-experimental study. The selection of the participants was based on the convenience sampling method. Twenty-one people participated in the study and were divided into two groups of interventions. The study was conducted in the adult day-care center. In one group, 11 people and in the other group, 10 people were included. First, an educational session regarding sleep hygiene was held. Then, the EFT was administered for 4 weeks, 2 sessions per week, and each session lasted for 30 - 45 minutes in the intervention group by the student (first author); sleep hygiene training was also provided for the second group. Study measures included the PSQI (Pittsburgh sleep quality index), the Epworth Sleepiness Scale (ESS), and the Quality-of-Life Scale. Follow-ups were performed after the intervention and one month later. The statistical tests used were repeated measures and chi-Square tests. A P-value < 0.05 was considered as statistically significant. Results: The trend of changes in sleep quality (P = 0.001, P = 0.001, respectively) and sleepiness (P = 0.023, P = 0.001, respectively) was incremental and significant before and after the intervention and one month later in each of the groups, but results show that there was no significant interaction effect for any subscale, including subjective sleep quality (P = 0.786), sleepiness (P = 0.568), and quality of life (P = 0.289). Conclusions: According to the results, the EFT was effective on sleep quality, sleepiness, and quality of life of older adults in the adult day-care center, and sleep hygiene was influential.
SYNTHESIS AND GROWTHSTIMULATING ACTIVITY BASIS ON MONOALKYL ESTERS OF GLYCEROL
Authors: Олимов Рахмонали Амоналиевич
Published: November 2023

На основе моноалкиловых эфиров глицерина синтезирован ряд циклических тиолфосфатов, их состав и строение доказаны современными методами элементного и инструментальногого анализа. При испытании их на поссевах хлопчатника установлены рострегулирующие свойства полученных тиолфосфатов. Наибольшая эффективность имела место при замачивании семян хлопчатника 0,002% раствором 4-метоксиметил-2-оксо-2-тиометил-1,3,2-диоксафосфолана. При концентрации 0,002% энергия прорастания и всхожесть опытных семян увеличилась на 18,04-17,4%, корневая система и масса целого растения на 17,1мм и 28,2% соответственно. В итоге урожайность хлопка-сырца увеличилась на 27% по сравнению с контролем.

On a basis monoalkyl ethersof glycerin aethers a number cyclic thiolphosphates is systhesised, their compostion and a structure are proved by modern methods of the element and tool analysis. At test for cotton crops are established growth regulative properties received. At test for cotton crops are established properties received thiolphosphates. The greatest efficiency took place at soaking of seeds of a cotton of 0,002 % by a solution 4-methoxymethyl-2-oxo-2-tiomethyl-1,3,2-dioxophospholane. At concentration of 0,002 % energy of germination and growthing similar skilled seeds has increased on 18,04-17,4 %, root system and weight of the whole plant on 17,1мм and 28,2 % accordingly. As a result productivity of a clap-raw has increased by 27 % in comparison with the control.
CLASSIFICATION OF MUSIC LIBRARIES IN RUSSIA AND THEIR FEATURES
Authors: Блинова Екатерина Алексеевна
Published: November 2023

В статье характеризуются разновидности музыкальных библиотек России и их особенности. Изучается проблема классификации (типологии) музыкальных библиотек. Представлена многоаспектная классификация музыкальных библиотек по вхождению в состав организаций культуры и образования, по функциям, по доступности фонда пользователям. Анализируется каждый из видов музыкальных библиотек и их функции. Рассматривается сеть специальных (музыкальных) библиотек России.

The article characterizes the varieties of music libraries in Russia and their features. The problem of classification (typology) of music libraries is studied. A multidimensional classification of music libraries by membership in cultural and educational organizations, by functions, and by accessibility of the fund to users is presented. Each of the types of music libraries and their functions are analyzed. The network of special (musical) libraries of Russia is considered.
TINDAK PERUNDUNGAN: BULLYING DI SEKOLAH DASAR DAN PERAN GURU PENDIDIKAN AGAMA ISLAM DALAM MENCEGAH DAN MENGATASINYA
Authors: Diana Ridma
Published: November 2023

This study examines the role of Islamic Religious Education teachers in preventing and overcoming bullying in one of the SDIT X in Senen District, Central Jakarta. This research uses descriptive skinative method. The data collection techniques used in this research are observation, interview and documentation. The resource persons in this research are all Islamic Religious Education teachers who have had a teaching period of 2 years at SDIT X, with a total of 4 Islamic Religious Education teachers. The data analysis techniques used in this research are data reduction, data presentation and inductive inference. The results showed that the forms of bullying that occurred at SDIT X were acts of bullying, bullying both in the form of verbal and physical. The role of Islamic Religious Education teachers in preventing and overcoming acts of bullying is done in several ways, such as 1) Islamic Religious Education teachers always provide exemplary examples of akhlakul karimah to students and continue to monitor the development of students in the school environment; 2) Islamic Religious Education teachers always relate the content of religious material learned to everyday life regarding good morals and attitudes; 3) Islamic Religious Education teachers call individually to students who commit acts of bullying, bullying and then advise and provide direction to the perpetrators and victims of bullying; 4) Islamic Religious Education teachers coordinate with homeroom teachers and school principals to follow up on acts of bullying, by calling the parents of the perpetrators and victims of bullying to find solutions and solve problems.

Keywords: Bullying, Role of Islamic Religious Education Teacher, Elementary School
Mesleki ve Teknik Eğitimin Temel Sorunlarına ve Bilgisayar Kontrollü Üretim Dersi Öğretim Programına İlişkin Paydaş Görüşleri
Authors: DEMİRCİ Gökçen , GÜRLEN Eda
Published: November 2023

Bu araştırmanın amacı makine sektörü temsilcileri ile makine ve tasarım teknolojisi alanı öğretmenlerinin mesleki ve teknik eğitimin genel sorunlarına ve bilgisayar kontrollü üretim dersi programına yönelik görüşlerini tespit etmektir. Araştırmada nitel araştırma desenlerinden olgubilim deseni seçilmiştir. Veri toplama aracı olarak yarı yapılandırılmış görüşme formu geliştirilmiştir. Verilerin analizi için içerik analizi yöntemi kullanılmıştır. Araştırma sonuçlarına göre sektör temsilcileri ve alan öğretmenleri öğrencilerin mesleklerine karşı motivasyonlarının düşük olmasını, okullarda donatı eksikliğini, olumsuz mesleki eğitim algısını ve mesleki rehberlik hizmetlerinin yetersizliğini önemli sorunlar olarak görmektedirler. Bilgisayar kontrollü üretim dersi programına ilişkin sektör temsilcileri, hedefleri, içeriği ve öğretim materyallerini yoğun ve öğrenci seviyesi üstünde bulurken, öğretme-öğrenme süreçlerinin ve değerlendirme süreçlerinin uygulama ağırlıklı olması gerektiği yönünde görüş bildirmişlerdir. Öğretmenler ise ağırlıklı olarak hedeflerin öğrenci seviyesinde olduğunu ancak öğrencilerin seviyelerinin düşük olduğunu dile getirmişlerdir. Programın içeriği ile ilgili olarak öğretmenler içeriğin öğrenci seviyesi ve sektör beklentileri ile uyumlu olduğunu, öğretim materyallerinin yoğun olduğunu, öğretme öğrenme süreçlerinin uygulama ağırlıklı olması gerektiğini ve süreç değerlendirmenin önemli olduğunu belirtmişlerdir. Araştırma sonucunda Millî Eğitim Bakanlığı ve sektör temsilcilerinin iş birliğinin önemi ortaya çıkmış ve özel sektör ile yapılan protokollerin işlevsel olduğu görülmüştür.
PREPARATION OF ELECTROSPUN SILICA NANOFIBERS WITH CONTROLLED MESOPOROUS STRUCTURE VIA SURFACTANT SELF-ASSEMBLY
Authors:   , Suwansoontorn Athchaya
Published: November 2023

Silica electrospun nanofibers has been an interesting material for sensors or sorbents. Even though the electrospun nanofibers have high specific surface area, the researchers still improve their performance by creating porous structure in nanofibers. One of the methods is the use of surfactant micelle as a template for porous structure in nanofibers. However, the effect of surfactant micelle on porous structure in nanofibers is still a topic of discussion. Therefore, in this study various surfactants were examined for the effect on porous structure in electrospun silica nanofibers. Two types of surfactant were examined; cationic surfactant and non-ionic surfactant. Cationic surfactant with different non-ionic chain which are hexadecyl-trimethyl-ammonium bromide (CTAB), di-n-alkyl-dimethyl-ammonium chloride (DAAC), and n-octyl-trimethyl-ammonium bromide (OTAB) and non-ionic surfactant which is Pluronic F127 (PF) were studied. The characteristics of nanofibers were examined by FTIR, SEM, TEM, nitrogen physisorption and image analysis. The nanofibers with porous structure were observed. The concentration of some surfactants slightly impacted the morphology of nanofibers. In addition, the sol-gel process was interrupted when short alkyl chain surfactant was used at high concentration which prevents the formation of silica network structure. Moreover, the types and concentrations of surfactant affected the surface area, pore shape and uniformity of porous structure in silica nanofibers. Finally, the fabricated silica nanofibers were applied for a dye removal. The silica electrospun nanofibers showed a better efficiency in dye removal than the commercial silica gel.
Water-dispersible magnetic catalysts based on metal ferrite for selective oxidation of thiols
Authors:   , Kongcharoen Haruethai
Published: November 2023

Heterogenous magnetic photocatalyst, so-called multifunctional catalyst, has been of an intensive interests for using in many research fields. It can be also reused for several times after catalyzed the reaction by using magnetic field for separation. Magnetic metal- ferrite nanoparticles were synthesized by thermal decomposition method of iron (III) oleate in 1-octadecene in the presence of oleic acid leads to a simple, cost effective synthesis route for large scale monodisperse ferrite nanoparticles. Herein, Spherical magnetic metal ferrite (MFe₂O₄) with the diameter 6-13 nm, where M represents Mg, Fe, Co, Ni, Cu, and Mn, while maintaining the spinel crystal structure. The as-synthesized metal ferrites nanoparticles were characterized by using TEM, SEM-EDX, and XRD for their composition, size, shape, and structure. Moreover, MgFe₂O₄@TiO₂ core-shell structure was created by reverse-microemulsion for using in the selective oxidation of thiols. However, MgFe₂O₄@TiO₂ nanocomposites effectively catalyzed the aerobic oxidation of 4-chlorothiophenol under dark condition as well as MgFe₂O₄ without TiO₂ shell decoration within an hour reaction time. Therefore, the single metal ferrite with various metal would be interesting to further utilize instead of MgFe₂O₄@TiO₂ core-shell structure. Among all of metal ferrite nanoparticles, CuFe₂O₄ nanoparticles would be outstanding candidates for using under ambient condition in aqueous solution within 2 day to complete the aerobic oxidation of 4-chlorothiophenol to disulfide products. Magnetic metal ferrites can be magnetically recovered after finishing the reaction and reused up to forth runs without any significantly loss of catalytic activity. Therefore, these magnetic catalysts were effectively used in the selective oxidation of thiols that perform the catalytic property and magnetic property within the same materials.
Synthesis and investigation of photophysical properties of porphyrin-embedded polythiophene
Authors:   , Seelajaroen Hathaichanok
Published: November 2023

In this research, trans-A2B2-porphyrins and trans-A2B2-benzoporphyrins bearing phenyl and thiophene-based meso-substituents were synthesized and characterized by nuclear magnetic resonance spectroscopy and mass spectrophotometry.  The photophysical properties of both solutions and films of the target compounds were also investigated by UV-visible and fluorescence spectrophotometry.  Comparative studies of these compounds revealed that the replacement of phenyl with thiophene meso-substituents, the introduction of the additional thiophene ring and the extension of the porphyrin π-conjugated system significantly affected their photophysical and electrochemical properties.  Energy levels of their highest occupied molecular orbital and lowest unoccupied molecular orbital, and their energy gap were estimated and found to be in a range of –5.79 to –5.55, –4.05 to –3.87 and 1.5 to 1.9 eV, respectively.  The electropolymerization through the bithiophenyl units of the target compounds gave desirable porphyrin-embedded polythiophenes, the formation of which was confirmed by cyclic voltammetry and UV-visible spectrophotometry.  Their absorption properties of the resulting polymers were consistent with those of the monomers with broader typically occurred for the porphyrinic polymers.
Cholinesterase and Beta-Amyloid aggregation inhibitors from flowers of indian devil tree alstonia scholaris L.R. Br.
Authors:   , Puwasawat Irin
Published: November 2023

Six compounds were isolated from the flower extract of Alstonia scholaris by column chromatoghaphy. The chemical structures of all isolated compounds were elucidated by NMR analysis as α-amyrin acetate (1), stigmasterol (2), betulin (3), ursolic acid (4), β-sitosterol-3-O-β-D-glucopyranoside (5) and nareline (6). These compounds were further evaluated for their anti-cholinesterase, anti-amyloid aggregation and anti-lipid peroxidation activities. The IC₅₀ values toward acetylcholinesterase and butyrylcholinesterase of these isolated compounds were in the range of 0.070 -0.231 and 0.282-0.721 mM, respectively. Alkaloid 6 showed the highest inhibition toward both enzymes. Moreover, α-mangostin showed the acetylcholinesterase synergistic effect with compound 5. All five triterpenoids (1-5) displayed low anti-amyloid aggregation and anti-lipid peroxidation activities. Alkaloid 6 exhibited moderate amyloid aggregation inhibition with 28.1% at the final concentrations of 100 µM and showed low anti-lipid peroxidation activity.
Chemical constituents of lichen usnea baileyi (Stirt.) Zahlbr. From Vietnam and biological activities
Authors:   , Nguyen Kieu
Published: November 2023

Lichens, symbiotic association of fungal and photosynthetic partners, have been well known used as folk and traditional medicine. In this study, lichen Usnea baileyi (Stirt.) Zahlbr., collected from Tam Bo mountain, Di Linh, Lam Dong, Vietnam was investigated. Twenty four constituents were isolated and identified based on spectroscopic evidence and compared the data with those reported in literatures as stictic acid (1), constictic acid (2), babartic acid (3),  diffactaic acid (4), cryptostictic acid (5), hypoconstictic acid (6), menegazziaic acid (7), virensic acid (8), methylstictic acid (9), methyl 4-O-methyl haematomate (10), 8´-O-methylconstictic acid (11), 8´-O-methylmenegazziaic acid (12), 9´-O-methylprotocetraric acid (13), protocetraric acid (14), atranorin (15), methyl b-orsinol carboxylate (16), atranol (17), usnic acid (18), (20R,24R)-ocotillone (19), (20S,24R)-ocotillone (20), betulonic acid (21), dasypogalactone (22), 4-O-demethylbabartic acid (23), and 7-hydroxy-5-methoxy-6-methylphthalide (24). The antibacterial activities of nineteen compounds (1, 2, 4-9, 13-22, 24) were investigated against Propionibacterium acnes KCCM41747, Staphylococcus aureus ATCC25923, Streptococcus sobrinus KCCM11898, Streptococcus mutans ATCC25175 and Salmonella typhi ATCC442. Usnic acid (18) of 1 mM exhibited the highest activity against all bacteria with inhibition zone average in a range of 21-28 mm. Moreover, the antioxidant activity of thirteen compounds (1, 4, 5, 7-11, 14, 17, 19, 20, 22, 24) were investigated using DPPH radical scavenging assay. The scavenging effects of all compounds were in the range of 20-86 %. Among tested compounds, virensic acid (8) exhibited the highest DPPH radical scavenging activity with IC50 0.41 mM.
Electrochemical properties of layered perovskite (LnxSr4-x MyFe6yO13+δ; Ln = La, Pr, Sm AND M = Co, Ni) as cathodes forintermediate - temperature solid oxide fuel cells
Authors:   , Kamlungsua Kittiwat
Published: November 2023

Layered perovskites, Sr4Fe6O13, LaxSr4-xFe6O13, PrxSr4-xFe6O13, Smx
Sr4-xFe6O13, Sr4CoxFe6-xO13, and Sr4NixFe6-xO13 have been investigated as cathode materials for intermediate – temperature solid oxide fuel cell (IT-SOFC). All layered oxides were prepared through conventional solid – state reaction method with the respective calcination and sintering temperatures of 850oC for 16 hours and 1185oC for 5 hours and they exhibited a gradual phase transformation from the pure layered phase to the perovskite phase with increasing the dopant content. In addition, the incorporation of Pr, Sm, and Co led to the increasing of electrical conductivity in PSFx, SSFx, and SFCox oxides whereas doping of La and Ni resulted in the transition in electrical conduction from semiconducting to metallic – like behaviours for LSFx and SFNix oxides. XPS analyses and thermogravimetric analyses revealed the different charge compensation mechanisms in lanthanide – and transition metal – containing oxides. The reduction in polarisation resistances with the increased dopant concentration was also observed, in general, for all oxides. The increase in the electrical conductivity and the decrease of the polarisation resistance of the synthesised oxides with increasing the dopant concentration have stemmed from the synergistic effect on the presence of both perovskite and layered phases that provided fast oxide ion diffusion channels and acted as a continuous network for electron transport.
DEVELOPMENT OF CHEMILUMINESCENCE SYSTEM FOR DETERMINATION OF TOTAL ANTIOXIDANT CONTENT IN WINES AND BEVERAGES
Authors:   , Saowadee Masinee
Published: November 2023

A sequential injection analysis (SIA) with chemiluminescence (CL) detection system was developed for determination of total antioxidant content (TAC) in wines and beverages. The method is based on the CL reaction between luminol and hydrogen peroxide in alkaline conditions with the presence of a K3Fe(CN)6 catalyst. Antioxidants in the sample scavenged a reactive oxygen species as hydrogen peroxide and the decrease in CL intensity was observed that related to the TAC in sample. A cost-effective CL detection system with a home-made spiral configuration flow-cell was designed and constructed by inexpensive materials. The spiral chemiluminescence flow-cell was made from an opaque white polymer of polymethyl methacrylate (PMMA) or acrylic plastic. Furthermore, a light-to-voltage optical sensor was used as a low-cost alternative detector which is small and was also used for the miniaturization of instrument. Thus, the developed CL detection system is cost-effective, portable and has the ability to connect with flow-based systems. The optimum conditions of SIA-CL method were studied and the linear range for gallic acid was obtained ranging from 0.5 to 5.0 mmol L-1, the limit of detection (LOD) was 0.25 mmol L-1 and the limit of quantitation (LOQ) was 0.84 mmol L-1. The reproducibility of the method was investigated and the between day %relative standard deviation was in the range of 2.2 to 5.4%. The %recovery was between 95.8 and 105.6% and the sample throughput was 60 samples h-1. The proposed method was successfully applied for the determination of TAC in wine and beverage samples and the results were not significantly different when compare with the reference method. Therefore, the developed SIA-CL method is simple, fast, accurate and consume less reagent.
DEVELOPMENT OF TRIAZATRUXENE SYNTHESIS USING N-BROMOSUCCINIMIDE
Authors:   , Toworakajohnkun Natthawut
Published: November 2023

Derivatives of triazatruxene (TAT) recently gain much attention for the development of organic optoelectronic materials due to their interesting photophysical properties and high thermal stability. Previous reports on the synthesis of triazatruxene usually rely on cyclocondensation reaction of oxindole or indole, using phosphorus oxychloride or liquid bromine as the reagent. These reagents are highly hazardous, extremely reactive, and exist in liquid form which is inconvenient for storage or uses in large quantities. This research aims to develop a new process for the synthesis of TAT from indole using solid N-bromosuccinimide as the reagent, which should be more users friendly, less hazardous, and more cost-effective than phosphorus oxychloride and bromine. The optimal conditions for this reaction which include solvent, the amount of reagent, reactant concentration, temperature, reaction times and addition method are investigated. Additional experiments are also conducted in order to gain access toward the reaction mechanism. The optimized condition is then used on a larger scale to demonstrate the reproducibility of the process. The scope of the reaction is examined using variously substituted indoles as starting materials.
Bioactive compounds from the leaves of Murraya paniculata (L.) Jack
Authors:   , Samritsakulchai Nawara
Published: November 2023

Murraya paniculata (L.) Jack is a tropical evergreen rounded shrub found in South and Southeast Asia, China and Australia. Recent phytochemical studies revealed a positive correlation between the traditional usage and several groups of active constituents in the class of coumarin, cinnamate, flavone and polyphenol. In this work, thirty-three compounds were isolated from the leaves of M. paniculata. 2,6,2′,6′-Tetramethoxy-4,4′-bis-(1,2-trans-2,3-epoxy-1-hydroxypropyl) biphenyl (20) and medioresinol (21) were reported for the first time as constituents in this plant. Antifeedant, insecticidal, repellent, antibacterial, antioxidant, anti-inflammatory and antihuman carbonic anhydrase II activities of some isolated compounds were investigated. The MeOH extract exhibited antifeedant activity against S. litura larva with 62% antifeedant index. Insecticidal activity of three main compounds, murrangatin acetate (5), auraptene (2) and phebalosin (3) exhibited the high percentage of larval mortality in range of 80-93%, together with good repellent activity. Only scopoletin (12) displayed moderate antioxidant activity with IC50 289 µg/mL. Nonetheless, all compounds did not show antibacterial and anti-inflammatory activity. Interestingly, murpaniculol (17) and octanoyl coumarin (35) inhibited the activity of human carbonic anhydrase II at the lowest concentration of <0.032 µM.
Programming of one- and two-electron integrals in MOCCA program
Authors:   , Kharmsri Noppakoon
Published: November 2023

Application of quantum theory in chemical problem is acceptable by many chemists around the world. One- and two-electron integrals are the most timeconsuming part limiting quantum theory application for large scale chemical system. Operation on graphic processing units (GPUs) for quantum chemistry calculation is one choice for accelerating the calculations. In this work, the calculations of oneand two-electron integrals were implemented for MOCCA program on GPU. According to the results, the one- and two-electron integrals calculated from the MOCCA program are realiable compared with GAMESS (US) program. The accuracy of oneand two-electron integrals calculated by MOCCA program is better than the level of 1 x10¹¹ compared with GAMESS (US) program. MOCCA program can calculate faster than GAMESS (US) program about 150-7000 times.
Encapsulation of water-dispersed clove oil in alginate beads and cellulose films
Authors:   , Tungittibath Peewara
Published: November 2023

The aim of this research was to prepare of clove oil (CO) film and clove oil-loaded alginate bead to use as fish anesthetic. Both forms were based on the incorporation of clove oil in the matrix of carboxymethylcellulose (CMC) and xanthan gum (XG) to enhance the water solubility of CO in the water and seawater. The loading efficiencies of CO film and bead were 32.7% and 8.0%, respectively. The CO films dissolve in water better than that in the seawater, whereas CO-loaded alginate bead swelled faster in the seawater but released faster in the water. The SEM images, IR spectrum and TGA thermograms clearly confirmed the presence of clove oil in the network of polymer matrix. The CO film and bead were kept in vacuum and non-vacuum foil sealed bag at 40°C for 120 days. Their chemical and physical properties were investigated. The color of both forms was gradually yellow. The LC percentage of CO film was reduced but that of CO bead unchanged in both conditions. Most properties of both forms were not significantly different between storage in vacuum and non-vacuum.
CHEMICAL CONSTITUENTS FROM THE ROOTS OF Calophyllum inophyllum L.
Authors:   , Ponguschariyagul Sasa
Published: November 2023

Phytochemical investigation of the CH2Cl2 extract from the roots of C. inophyllum let to the isolation of five new chromanone derivatives, namely caloinophyllins A-E (1-5), along with nine known compounds (6-14), nobiletin (6), pentamethylquercetin (7), 3,5,7,4'-tetramethoxyflavone (8), 5,7,4'-trimethoxyflavone (9), 1,5-dihydroxyxanthone (10), 1,8-dimethoxyxanthone (11), caloxanthone B (12), 4-methoxycaffeic acid (13) and 1,6-dihydroxy-7-methoxyxanthone (14). The structures of five new compounds (1-5) were elucidated by using 1D and 2D-NMR spectroscopy. The structures of known compounds (6–14) were determined and confirmed by comparison of their 1H and 13C NMR spectroscopy data with the previous published data. Moreover, all isolated compounds were assessed for their in vitro cytotoxicity against the KB, HeLa S-3, MCF-7, HT-29 and Hep G2 human cancer cell lines. The results revealed that compound 5 showed a good cytotoxicity against five cancer cell lines with IC50 values in the range of 0.78-10.35 µM. Compound 14 showed a moderate activity against KB, HeLa S-3 and MCF-7 cell lines with IC50 values in the range of 18.19-25.84 µM and compounds 1, 2, 4 and 12 showed a weak activity with IC50 values in the range of 55.77-95.47 µM. The other compounds were inactive (IC50 > 100 µM) against five human cancer cell lines. In addition, all isolated compounds (1-14) were evaluated for their α-glucosidase inhibitory activity (yeast and rat small intestinal). All of them displayed no activity against both yeast (IC50 > 600 µM) and rat small intestinal (IC50 > 3,000 µM) α-glucosidase enzymes.
Cross-linked micelles prepared from amphiphilic copolymers having active ester groups
Authors:   , Noree Sunita
Published: November 2023

Poly(pentafluorophenyl methacrylate) (PPFPMA) was first subjected to post-polymerization modification with oligo(ethylene glycol) methyl ether amine (OEG-NH2) and yielded poly(pentafluorophenyl methacrylate)-co-poly(oligo(ethylene glycol methacrylamide)), PPFPMA-co-POEGMAM. These amphiphilic random copolymers can self-assemble into micellar nanoparticles in water having size less than 100 nm. By tandemly reacting the pentafluorophenyl (PFP) groups in the copolymeric nanoparticles with a dithiol crosslinker, cystamine, redox-responsive nanogels can be formed. The remaining PFP groups in the nanogels were removed by reacting with isopropylamine, resulting in a crosslinked drug delivery nano-carriers with highly biocompatible property. All stepwise post functionalization was monitored by FTIR and 19F NMR spectroscopy. Release of a hydrophobic guest molecules, nile red (NR) or curcumin (CUR) from the nanogels, simultaneously encapsulated during micelles formation, can be accelerated in the presence of glutathione (GSH). Results from cytocompatibility evaluation and cellular uptake study suggested that these developed redox-responsive nanogels strongly possessed a potential for applications in controlled delivery.
Electrospun polyacrylonitrile nanofibers as fiber coating in solid phase microextraction
Authors:   , Sungoradee Thichakorn
Published: November 2023

Solid-phase microextraction (SPME) is widely used to preconcentrate analytes from sample. In this research, the polyacrylonitrile (PAN) nanofibers were fabricated on a metal wire via electrospinning method and used as a fiber coating for a homemade SPME unit. The SEM images show that the fiber coating’s surface was porous, and homogeneous. The average nanofibers diameter were 165 nm to 464 nm with PAN concentration from 3 to 10 %w/v. The homemade SPME unit was then applied for the extraction of 6 polycyclic aromatic hydrocarbons (PAHs) in water by headspace technique. Then it can directly transfer and desorb in the GC injection port by thermal desorption and analyzed by GC-FID. The optimum extraction condition was extraction time of 30 minutes, extraction temperature of 40 ◦C, and NaCl addition of 10% w/v. Desorption time and desorption temperature were optimized at 5 min and 200 ◦C, respectively. The percentage of recoveries of spiked water at 40 µg/L were 95.8 - 115.1 % with %RSD less than 12.7% for 5-PAN SPME fiber and 80.3 - 108.6% with %RSD less than 7.4% for 7-PAN SPME fiber. In addition, the good linearity for the analysis of 6 PAHs by 5-PAN and 7-PAN SPME fibers were in the range of 5 - 75 µg/L with R2 between 0.9697 and 0.9954 for 5-PAN and 5 - 75 µg/L with R2 between 0.9797 and 0.9956 for 7-PAN. The LODs were 0.08 - 0.5 µg/L for 5-PAN SPME fiber and 0.1 - 0.9 µg/L for 7-PAN SPME fiber. For durability, a homemade SPME fibers can reuse up to 20 times. Finally, the electrospun PAN SPME fibers were applied to extract PAHs in trace level (60 µg/L) from real water samples. The %recovery of extraction of PAHs ranged from 53.6 – 155.4 %.
Reliability analysis of natural soil slope considering the effect of vegetation
Authors:   , Son Nguyen
Published: November 2023

Over the past decades, effects of climate change including intense rainfalls have resulted in many slope failures. Research activity in understanding the mechanism of rainfall-induced landslides has recently focused on the probability of slope failure. In addition, the effect of root reinforcement on slope stability has been recognized especially for vegetated slope. In this research, a reliability analysis of soil slope considering the effect of vegetation is performed. The spatial variability of soil properties and vegetation is assumed to be modelled as a stationary random field in slope reliability analysis. The shear strength parameters of soil and root cohesion quantified by statistical characteristics are considered. Two natural slopes are selected as case studies. Firstly, a case study of shallow failure located on sandstone slopes in Japan is used to verify the analysis framework. A series of seepage and stability analyses of an infinite slope based on random fields is conducted. The results confirm that a probabilistic analysis can be efficiently used to qualify various locations of failure surface caused by spatial variability of soil shear strength for a shallow infinite slope failure due to rainfall. Secondly, a field monitoring on a residual soil slope in Thailand is modelled. The soil water characteristic curve and the saturated permeability measured from the tests are used in the transient seepage analysis. The results of pore water pressure are compared with the monitored values from the site. The shear strength of soil from the root cohesion is modelled for vegetated soil slope. Factors of safety calculated from transient seepage and slope stability analysis are compared between vegetated and non-vegetated cases. In addition, the effect of spatial variability of root cohesion on probability of slope failure is considered. The results exhibit that a uniform distribution of root can significantly contribute to slope stability especially for the vegetated slope.
ANALYSIS OF TWO-DIMENSIONAL LINEAR FIELD PROBLEMS BY SCALED BOUNDARY FINITE ELEMENT METHOD
Authors:   , Chung Nguyen
Published: November 2023

This dissertation presents the development of an efficient and accurate numerical technique based upon the scaled boundary finite element method that is capable of solving two-dimensional, second-order, linear, multi-field problems. Basic governing equations are established in a general context allowing various classes of linear boundary value problems such as the steady-state heat conduction, the steady-state flow in porous media, linear elasticity, linear piezoelectricity, and other related couple-field problems to be treated in a unified fashion. The scaled boundary finite element equations are also formulated within a broad framework integrating the influence of the distributed body source, general boundary conditions, contributions of the side face with either prescribed surface flux or prescribed state variable, and the flexibility of the scaled boundary approximations. Several examples are solved and selected results are reported not only to verify the implemented technique but also to demonstrate its vast capability, computational efficiency, and robustness.
Performance prediction of axially loaded piles and pile groups by load transfer method
Authors:   , Lai Qui
Published: November 2023

Nowadays, economic and population growth around the world increase the speed of urbanization, making skyscrapers become popular. Together with the development of high-rise buildings, the requirements of capacity and settlement of foundations become complex and demanding. In particular, the accurate estimation of pile settlements becomes essential in pile design. The load transfer method (Seed and Reese, 1957) is practical for routine design because of its less computational effort. In the early days, the load transfer methods were based on relationships between the resistance and relative displacement at pile-soil boundaries which are usually referred to as t-z curves. Since these techniques did not consider the deformation of soil around piles, they cannot be applied to the settlement analysis of pile groups.

In this study, a new nonlinear approach for axially loaded piles and pile groups is proposed and validated with field tests and model tests. The proposed method divides the settlement of soil into elastic and inelastic (slippage) components. The inelastic deformation is assumed to occur in a narrow zone around piles while the deformation in the outer zone is determined by an elastic solution proposed by Randolph and Wroth (1978 & 1979). The extension from single pile analysis to pile group analysis is carried out based on the interaction factor concept (Poulos, 1968) together with the reconsideration of the pile-soil-pile interaction by taking the stiffening effect of nearby piles into account. Predictions by the proposed method are well agreed with the validation data, under both of rigid and flexible cap conditions. In addition to the general procedure, a simplify solution is also provided for typical conditions which usually encountered in routine designs.
ANALYSIS OF STRESS INTESITY FACTORS FOR CRACKED I-BEAMS WITH NON-OVERLAPPING CRACK SURFACES
Authors:   , Ma Hieu
Published: November 2023

The physically acceptable analysis of stress intensity factors (SIFs) for cracked steel I-beams was presented in this research. The finite element method was used to calculate the stress intensity factors of two-tip web cracks in steel I-beams with non-overlapping behavior, i.e., crack surfaces were not allowed to overlap. For the center-cracked infinite and finite-width plates under bending, previous studies indicated that the SIF solutions at the tension-side crack tips are not conservative if non-overlapping behavior is not considered. Three-dimensional finite element analyses based on linear elastic fracture mechanics (LEFM) were performed and verified with SIF results from the non-overlapping center-cracked finite-width plates (weight function method) and the overlapping two-tip web crack in I-beams under bending (finite element method). Furthermore, a numerical analysis obtained from the previous finite element solution of overlapping cracked I-beams was then carried out to verify the present finite element model. The effects of parameters including the length of I-beams, magnitude of applied moment, web crack length, flange-to-web area ratio and crack eccentricity on the non-overlapping SIF solutions at tension-side crack tip were also examined in the study.
STATIC ONE-TO-ONE MULTI-VEHICLE PICKUP AND DELIVERY PROBLEM WITH MULTIPLE DEPOTS
Authors:   , Lucero Paolo
Published: November 2023

The research describes a static case of the pickup and delivery problem with multiple depots and proposes a solution approach that forces a combination of requests in a particular route. To solve the problem, the model is implemented using General Algebraic Modelling System (GAMS) with CPLEX as the solver. Euclidean distances are considered as the total cost between nodes. Instances based on existing studies are used for computational experiments. Best-bound search and depth-first search methods of the branch-and-bound algorithm are also compared. Results of the trials implemented in GAMS are presented in the study. The optimal solutions found with routes having combined requests show significant distance reduction compared to the typical individual service of one request per route. Results also show that as the number of allowed requests in one route is increased, the effect of the number and variation of depots also decreases. The main contribution of this research are applications in GAMS that can solve the static case of the messenger problem in a multi-depot variation, a setup with few available literature. The study can be beneficial for logistics companies especially those of which specializing in pickup and delivery services.
DYNAMIC INTERACTION BETWEEN RECTANGULAR PLATE AND MULTI-LAYERED POROELASTIC MEDIA
Authors:   , Plangmal Rawiphas
Published: November 2023

This thesis is concerned with dynamic interaction between a rectangular plate and a multi-layered poroelastic medium. The plate is assumed to be massless and rigid, and subjected to time-harmonic vertical, horizontal, and moment loading. In addition, the contact area between the plate and the supporting medium is assumed to be fully permeable. The poroelastic medium under consideration consists of N poroelastic layers of different thicknesses and material properties, and each layer is governed by Biot’s poroelastodynamics theory. The interaction problem is formulated by dividing the contact area into a finite number of small rectangular elements with uniform traction distribution. Nodal points are selected at the center of each element. An equation system is formed to determine the magnitude of contact traction at the nodal points by imposing appropriate rigid body displacement boundary conditions. The influence functions required to establish the flexibility equation system correspond to the displacement of a multi-layered half-space under vertical and horizontal loads of unit intensity. These influence functions are obtained by employing the exact stiffness matrix method. A computer program based on the present numerical scheme has been developed, and the accuracy of the solution scheme has been confirmed by comparing with existing solutions. Selected numerical results are presented to demonstrate the influence of various parameters such as poroelastic material parameters, frequency of excitation, embedded depth, plate aspect ratio etc., on the compliances of a rigid rectangular plate.
A system for monitoring cost and payment with 5D BIM
Authors:   , Lin Xiao
Published: November 2023

Cost and payment monitoring are claimed as the essential process for project management. Cost and payment monitoring is used for tracking the status of project cost during the construction process. However, the current information of cost and payment in the monitoring practice has to manually check with several documents including drawing, cost data and schedule plans. So the traditional practice has consumed more time with unnecessary works and caused some difficulties in the re-calculation to monitor cost and payment progress. To overcome this problem, this research proposed the system for monitoring cost and payment progress by using building information modelling (BIM), which is referred to 5D BIM. The system could be applied to interchange time and cost information with 3D model. To develop this system, current practices on cost and payment monitoring is explored by interviewing experts about related process and information. With the result of interview, the framework of the cost and payment monitoring system is developed. This system applies visual programming language (Dynamo) to link information between Revit and Excel. In preconstruction stage, the information of cost and schedule plan is defined in Excel. The system is developed by using the visual programming extension to interchange cost and time information with 3D model that interacts date from excel to 3D model. In construction stage, actual progress of cost and payment are collected and stored in Excel and 3D model, the visual programming extension is designed to calculate earn value, cost progress and payment progress in Excel. In addition, the status of delay, over budget and unpaid works can be visualized in a color scheme in 3D model by a visual programming extension. Result shows that the proposed system is able to monitor cost and payment progress with visualization automatically.