bluuebunny/crossref_metadata_2025 huggingface dataset:
Kinetic study of L-lysine and L-arginine by hexacyanoferrate (III) ion in presence of Os (VIII)
Authors: Singh Tejpal
Published: January 2023

Amino acids and their metal complexes have vital role in functioning the metabolism of all living system. Amino acids can undergo many types of reactions in acidic as well as in alkaline medium. The reactions of L-lysine and L-arginine amino acids have been selected in alkaline medium for the present study. The kinetics of oxidation of L-lysine and L-arginine by alkaline Os (VIII), which was continuously regenerated by hexacyanoferrate (III) ion, was studied in the 0.01- 0.10 M and 298 K – 318 K temperature range. The rate of reaction was found to be zero with respect to [Fe(CN6)]3- and one with respect to Os (VIII).
Assessing Adverse Impacts of Aquaculture Activities on Groundwater Quality in Ponneri Taluk of Tiruvallur District, Tamilnadu using Drinking Water Quality Index
Authors: Kolanuvada Srinivasa Raju , S. Sivkumar
Published: January 2023

Tamilnadu is a State that is deprived of perennial water sources like major rivers and streams. Agricultural activities in Tamilnadu are mainly dependent on seasonal rainfall and ground water. The shortages of water resources drive many coastal farmers to convert their fertile agricultural lands to aquaculture. Groundwater suitability for human consumption is determined by its physical, chemical and bacteriological properties. Irrational conversion of agricultural lands to aquaculture is found to be unsustainable leading to wastage of sparse natural resource fertile land and groundwater. The aquaculture practices started very extensively since year 2012 where fertile agriculture land, land with scrub and wasteland area have been converted for the aquaculture ponds. The use of temporal remote sensing helps in understanding the patterns of land use conversion from agricultural practice to aquaculture. In addition, indiscriminate use of fertilizers and chemicals in aquaculture farming has led to soil salinization and ground water pollution in many parts of study area. Use of salinity indices was tried in identification of salinity levels in lands in and around the current and abandoned aquaculture ponds. The study indicates that the use of Remote Sensing and GIS has helped in identification of landuse conversion and its adverse effects on characteristics of land due to extensive aquaculture activities in Ponneri Taluk of Tamilnadu. Using satellite data of Landsat OLI 8 (2015), IRS LISS IV, Sentinel II 2017, the changes have been estimated. The water quality parameters include pH, TDS, cations such as Ca, Mg, Na and K, anions such as Cl, SO4, HCO3, NO3 and PO4. Surface and groundwater quality results are cross-checked at the field areas which clearly indicate that almost entire Ponneri Taluk groundwater is unsuitable for drinking purposes. The classification for drinking water is obtained by DWQI. The piper plot has been studied by the geochemistry methods.
One-pot Synthesis of Thieno[2, 3-b]quinoline derivatives using Magnetically Active CuO Nano particles and Investigation of their Anti-Malarial Activities
Authors: Sangula Vara Satish , Sanasi Paul Douglas
Published: January 2023

A novel approach of forming thieno[2,3-b]quinoline derivatives (3a-h) was reported in the presence of copper oxide nano particles (CuO NPs). The reaction was conducted with 2-chloroquinoline-3-carbaldehyde as the precursor and its analogs (1a-h) which have undergone cyclo-condensation with thioglycolic acid (TGA, 2) and tetrahydrofuran (THF) solvent under reflux conditions (50 oC) for 2h. The synthesized CuO NPs were characterized by using PXRD and SEM-EDS instrumental techniques. The structural attributes of the organic compounds were confirmed with FTIR, 1H-NMR, 13C-NMR and Mass spectral techniques. The effectiveness of the CuO NPs in forming the compounds was evaluated by conducting the reaction with other metal oxides like ZnO, TiO2, NiO and it was observed that the CuO NPs were highly prominent in forming the desired compounds in higher yields and less time. Furthermore, the magnetic property of the CuO NPs was determined through hysteresis loop and the specific magnetization (Ms) was obtained at 19.79 emu/g. It indicates the prevailing magnetic property in the NPs, so that they can be easily separated from the reaction mixture. The anti-malarial activity of the compounds was evaluated using P. falciparum culture line with chloroquine (CQ) as the standard drug. In these studies, the thieno[2,3-b]quinoline derivatives with active functional groups have performed better than those with the deactivating group.
Polylinear continuations of some discrete functions and an algorithm for finding them
Authors: Баротов Д.Н. , Баротов Р.Н.
Published: January 2023

Исследована проблема существования и единственности полилинейных продолжений некоторых дискретных функций. Доказано, что для любой булевой функции существует соответствующее полилинейное продолжение и оно единственно. Предложен алгоритм нахождения полилинейного продолжения булевой функции и доказана его корректность. На основе предложенного алгоритма найдены явные формы полилинейных продолжений сначала для булевой функции, а затем для произвольной функции, определенной на множестве вершин n-мерного единичного куба, произвольного куба и параллелепипеда, и в каждом конкретном случае доказана единственность соответствующего полилинейного продолжения.

In this paper, we study the existence and uniqueness of polylinear continuations of some discrete functions. It is proved that for any Boolean function, there exists a corresponding polylinear continuation and it is unique. An algorithm for finding a polylinear continuation of a Boolean function is proposed and its correctness is proved. Based on the result of the proposed algorithm, explicit forms of polylinear continuations are found first for a Boolean function and then for an arbitrary function defined only at the vertices of an n-dimensional unit cube, an arbitrary cube, and a parallelepiped, and in each particular case the uniqueness of the corresponding polylinear continuations is proved.
Diarylidene-N-Methyl-4-Piperidone and Spirobibenzopyran Curcumin Analogues as Antioxidant and Anti-Inflammatory Pharmacophores
Authors: Kumar R. Siva , Mas-Rosario Javier , Joshi Bishnu , Joshi Mayank , Choudhury Angshuman Roy , Kar Swayamsiddha , Rao G. Nageswara , Farkas Michelle
Published: January 2023

There is a significant need for new small molecule anti-inflammatory compounds. Curcumin, a small molecule natural product from the Turmeric (Curcuma longa) plant, has well-known anti-oxidant properties, resulting from its radical scavenging ability and inhibition of inflammation-associated factors. However, its lack of solubility, instability, and poor bioavailability and biodistribution characteristics are an impediment to its use. To circumvent these issues while retaining curcumin’s biological activity, we synthesized twenty-one diarylidene-N-methyl-4-piperidones (DANMPs), four diheteroarylidene-N-methyl-4-piperidones (DHANMPs), and five spirobibenzopyran (SBP) derivatives. All were screened in terms of anti-oxidant activity via a cell-free 2,2-Diphenyl-1-picrylhydrazyl (DPPH) radical scavenging assay and for drug-like properties in silico. In the former, some compounds possessed improved radical scavenging behavior versus ascorbic acid, which was used as a benchmark. Conformity to simulated Lipinski’s parameters and Absorption, Distribution, Metabolism, and Excretion (ADME) studies indicated the DANMPs, DHANMPs, and SBPs to be potentially useful compounds. A subset of molecules was investigated in terms of their aqueous solubilities, which were significantly improved compared to that of curcumin. In vitro assessments of the cellular and anti-inflammatory effects of these compounds were conducted using RAW264.7 macrophages. RT-PCR and Griess assays were used to evaluate the presence of inflammatory/activated (M1) markers and production of nitric oxide (NO) species, which are associated with inflammation, respectively. While the compounds did not affect non-stimulated (naïve) macrophages, they did reduce levels of markers and NO to extents similar to or better than curcumin in inflamed cells. Our results indicate that these pharmacophores possess anti-inflammatory properties and can be used as curcumin-substitutes with improved characteristics. Further investigation into their mechanisms of action and potential use in the treatment of inflammatory diseases is merited.
Manganese Catalysed Dehydrogenative Synthesis of Polyureas from Diformamide and Diamines
Authors: McLuskie Angus , Brodie Claire , Tricarico Michele , Gao Chang , Peters Gavin , Mackay C Logan , Tan Jin-Chong , Kumar Amit
Published: January 2023

We report here the synthesis of polyureas from the dehydrogenative coupling of diamines and diformamides. The reaction is catalysed by a manganese pincer complex and releases H2 gas as the only by-product making the process atom-economic and sustainable. This work advances the current state-of-the-art by replacing a toxic feedstock – diisocyanates (used to make polyureas) with a safer feedstock – diformamides and using a catalyst based on an earth-abundant metal. We also report here the physical and mechanical properties of the isolated polyureas. We suggest that the reaction proceeds via isocyanate intermediates that are formed by the manganese catalysed dehydrogenation of formamides.
Lima: ciudad no inclusiva e insegura
Authors: Calle de Sarabia Luisa Mariana
Published: January 2023

Uno de los objetivos de desarrollo sostenible al 2030 es lograr ciudades inclusivas, seguras, resilientes y sostenibles. Tengo 67 años y nací con baja visión. Mi vida en Lima ha sido feliz, a pesar de no ser esta una ciudad inclusiva ni segura, pues he encontrado muchos obstáculos, como zanjas, huecos, veredas, columnas y postes sin señalización y de diferentes tamaños y alturas. Las caídas y golpes han pasado a ser simples anécdotas, pero lo cierto es que Lima es una ciudad muy peligrosa para las personas con baja visión. Los semáforos no dan ninguna seguridad, pues su ubicación no ayuda al momento de cruzar calles y avenidas. En los edificios encontramos escaleras sin señalización y la mayoría carece de rampas. Cuando informo sobre esto a las personas que deberían tener señalizados los escalones, su respuesta es “no se ve bonito”. ¿Qué vale más, la estética o la accesibilidad universal?
PENGARUH PENGGUNAAN LAHAN TERHADAP KINERJA JALAN di PEREMPATAN JALAN WOLTER MONGINSIDI
Authors: Citra Pramesti Widya Ineuke , Wahjoerini Wahjoerini
Published: January 2023

Perempatan Jl. Wolter Monginsidi merupakan jalan kolektor sekunder yang terletak di wilayah Kelurahan Pedurungan Tengah. Masalah yang terjadi terkait kemacetan yang terjadi pada waktu prime time (pagi 06.30-07.30) dan (sore 16.30-17.30), hilangnya bahu jalan, serta adanya parkir liar dibeberapa sarana perdagangan dan jasa.Tujuan dalam penelitian ini untuk mengetahui pengaruh penggunaan lahan terhadap kinerja jalan di perempatan Jalan Wolter Monginsidi. Metode penelitian yang digunakan yaitu kuantitatif dan menggunakan analisis regresi linear. Dilihat dari Rencana Tata Ruang Wilayah Kota Semarang Tahun 2011-2031, sarana perempatan Jalan Wolter Monginsidi tidak salah dan sudah sesuai. Pada jam puncak pagi dan sore, tingkat pelayanan jalan termasuk kategori B (stabil), jam non puncak siang kategori A (bebas). Besar pengaruh penggunaan lahan 0,473, dalam artian arah pengaruh variabel X terhadap Y akan bertambah dan tidak berkurang pengaruhnya meskipun hanya 1%. Dalam pembangunan tata guna lahan atau pemanfaatan ruang daerah/ perkotaan, pemerintah perlu memperhatikan daya dukung lingkungannya. Perencanaan mendatang bisa menerapkan vertical building yang dimana tidak memakan banyak lahan. Pembatasan penggunaan jalan dari pemerintah dimana kolektor sekunder seharusnya menghubungkan kawasan sekunder kedua dengan kawasan sekunder kedua atau sekunder kedua dengan sekunder ketiga, tetapi perempatan Jalan Wolter Monginsidi ini seakan penggunaannya seperti jalan nasional.
EFEKTIVITAS RUANG TERBUKA PUBLIK DI KELURAHAN BRUMBUNGAN KOTA SEMARANG
Authors: Pamurti Andarina Aji
Published: January 2023

Ruang Terbuka Publik merupakan ruang terbuka yang mampu mewadahi keperluan aktivitas masyarakat sebagai tempat pertemuan dan interaksi sosial yaitu berupa taman atau lapangan olah raga. Pada setiap kelurahan diperlukan taman atau lapangan olahraga sebagai pelayanan kebutuhan kegiatan penduduk di area terbuka. Di Kelurahan Brumbungan Kota Semarang terdapat 2 ruang terbuka publik yaitu Taman Nada dan Taman Kartun. Taman Nada adalah taman tematik yang menggunakan tema not nada sedangkan Tamah Kartun menggunakan konsep desain tema tokoh kartun dan diaplikasikan pada landmark dan keseluruhan desain taman. Taman Nada dan Taman Kartun tersebut tergolong dalam ruang terbuka aktif karena dipergunakan masyarakat untuk beraktivitas sosial dan berekreasi. Tujuan penelitian ini yaitu mengetahui tingkat efektivitas ruang terbuka publik yang berada di Kelurahan Brumbungan dengan melakukan penilaian pada setiap variabel dengan menggunakan variabel keamanan, kenyamanan, pencapaian, livability/kehidupan, dan image/citra dengan menggunakan metode deskriptif kuantitatif. Hasil penelitian ini adalah Taman Nada memiliki tingkat efektivitas kategori SEDANG dan Taman Kartun memiliki tingkat efektivitas kategori SEDANG. Perlu dilakukan perbaikan dan penambahan fasilitas yang belum ideal atau belum tersedia. Ruang terbuka publik tersebut memiliki manfaat dalam segi sosial, ekonomi dan ekologis.
ФІЗИКО-МЕХАНІЧНІ І ТЕПЛОФІЗИЧНІ ВЛАСТИВОСТІ ЕПОКСИДНИХ КОМПОЗИТІВ, НАПОВНЕНИХ ДИСПЕРСНИМИ ЧАСТКАМИ ОКСИТЕТРАЦИКЛІНУ
Authors: Соценко Віталій Віталійович
Published: January 2023

Для формування епоксикомпозитних матеріалів використовували епоксидний зв’язувач DER-331 виробництва «Dow Chemical Comp» (Німеччина). Для зшивання епоксидного зв’язувача використано твердник холодного тверднення триетилентетрамін ТЕТА (q = 10 мас. ч. на 100 мас. ч. епоксидної смоли DER-331). У якості наповнювача використано антибіотик тетрациклінового ряду дисперсністю 5…10 мкм. Проведено комплексні дослідження адгезійних, фізико-механічних властивостей за результатами яких встановлено оптимальний вміст окситетрацикліну у реактопластичній матриці, який становить q = 0,5…1,5 мас. ч. на 100 мас. ч. олігомеру DER-331 і 10 мас. ч. твердника ТЕТА. Такі композити характеризуються наступними властивостями: адгезійна міцність при відриві становить σа = 40,0 МПа, руйнівні напруження при згинанні – σзг = 80,0 МПа, модуль пружності при згині – Е = 3,3…3,4 ГПа, ударна в’язкість – W = 8,0 кДж/м2. Висунуто припущення, що підвищення механічної міцності розроблених матеріалів пов’язано з помірною рухливістю сегментів та бокових груп макромолекул композиту, що забезпечує гнучкість основного ланцюга, а, отже, пружні характеристики полімерного матеріалу. Додатково проведено дослідження наповнених композитних матеріалів в умовах впливу перемінних температур. Аналізували динаміку зміни теплофізичних властивостей епоксикомпозитних матеріалів у різних температурних діапазонах (ΔТ = 303…473 К). Показано, що композитні матеріали, які містять окситетрациклін за вмісту q = 0,5…1,5 мас. ч. характеризуються поліпшеними теплофізичними характеристиками. Зокрема: теплостійкість за Мартенсом становить – Т = 364 К; термічний коефіцієнт лінійного розширення за діапазону температур (ΔТ = 303…323 К) – α = (2,25…2,68) × 10–5 К‑1; температура склування – Тс = 352…356 К; усадка – ΔL = 0,29 %.
Paekawakawa’s Healing Corridor: An architectural approach to help the integration of immigrants in residential communities through biophilic-placemaking
Authors:   , Macovei Irina
Published: January 2023

A settler nation, Aotearoa’s history has been shaped by waves of immigration. Colonisation’s enduring impacts have favoured a Pākehā narrative of ‘one nation, one people’. Consequently, assimilative policies towards indigenous Māori and immigrant minorities were adopted to legitimise British hold over culture and land. Today, globalisation and labour demand encourage immigration from non-traditional countries, diversifying our population and challenging this homogenous cultural system. Bi-cultural and multicultural policy shifts have fostered cultural pluralism and inclusivity.

This thesis aims to support culturally inclusive architectural practices and, post-covid, wellbeing centred immigration policies through developing ‘immigrant friendly’ architectural interventions in Berhampore, Wellington. With its rich history of immigration and social justice, Berhampore is an optimal site to empower migrant identities and foster intercultural exchanges through architecture.

This research engages Biophilia, Topophilia, Aotearoa Based Placemaking and Intercultural theory as well as policy in order to understand how architectural space can cultivate belonging and ground ‘displaced’ immigrants in their new environment.

It aims to demonstrate how biophilic placemaking, integrated with intercultural design values can encourage empathy, cohesion, reciprocity and a shared love and attachment to place between immigrants and their host neighbourhood. In the hopes of creating positive acculturation experiences for migrants and their host communities.

A design-led research methodology informed the research outcomes. Testing and iterating design concepts was done through, sketching, modelling, photography, mixed media and CAD software. Wellington based immigrants were interviewed during the research process and the insights applied to the design-led research outcome.

This research found that a community-oriented space programmed with shared activities; and grounded in locality through biophilic design practices and a deep understanding of site ecology and history, provides immigrants with a platform to nurture and foster place belonging. Identity formation is a place specific endeavour, and this research hopes to shed light on Aotearoa oriented approaches to integrating and welcoming immigrants, through architectural design.
BCL6 is a context-dependent mediator of the glioblastoma therapy response
Authors:   , Tribe Anna
Published: January 2023

Glioblastoma is a rapidly fatal brain cancer with no cure. The resistance of glioblastoma tumours to available therapies means that more effective treatments are desperately needed. Previous research showed that the transcriptional repressor protein BCL6 is upregulated by chemo- and radiotherapy in glioblastoma and that inhibition of BCL6 enhances the effectiveness of these therapies. Therefore, BCL6 is a promising target to improve the efficacy of available treatments for glioblastoma. BCL6 is known as a transcriptional repressor in germinal centre B cells and an oncogene in lymphoma, as well as in other cancers. However, previous research indicated that BCL6 induced by therapy in glioblastoma may not act as a transcriptional repressor. This thesis aimed to clarify the role of BCL6 in the therapy response of glioblastoma. The effect of BCL6 inhibition on the whole proteome response of glioblastoma cells to DNA-damaging treatments was investigated. This confirmed that BCL6 was involved in the therapy response of glioblastoma and that acute irradiation appeared to cause BCL6 to switch from a repressor of the DNA damage response to a promoter of stress response signalling. Rapid immunoprecipitation mass spectrometry of endogenous proteins enabled identification of proteins associated with BCL6 in untreated and irradiated glioblastoma cells. BCL6 appeared to be a transcriptional regulator in untreated glioblastoma and its association with the corepressor NCOR2 was validated using proximity ligation assays. However, association with nuclear proteins was lost in response to acute irradiation. This was accompanied by the irradiation-induced association of BCL6 with plasma membrane proteins. Targeted long-read transcript sequencing did not reveal differential alternative splicing of BCL6 in response to acute irradiation. This indicated that the canonical BCL6 protein was expressed in irradiated glioblastoma cells and that the change in BCL6 function must be mediated by mechanisms other than the production of splice variants, such as through post-translational modification. Overall, these results support the hypothesis that BCL6 is involved in the therapy resistance of glioblastoma cells but reveal that its activity is context-dependent and may be mediated by the intensity of cellular stress.
Unearthing Contextual Foodscapes
Authors:   , Graetz Bliss
Published: January 2023

This research investigates how landscape architecture can engage with foodscapes to enhance their agency in addressing environmental and spatial injustices. The research poses the question: How can landscape architects engage with foodscapes and their role in environmental and spatial justice?

Concerned with developing new ways of engaging with foodscapes within the landscape architecture discipline, the following sub-questions frame the practice ambitions: How can landscape architects progress urban agriculture initiatives to become more spatially and culturally integrated within the landscape? How can landscape architects unearth and contextualise foodscapes?

Through an experimental practice-driven methodology, the research first defines the meaning and significance of a contextual foodscape for landscape practice; secondly explores the practice of unearthing environmental and cultural relationships within the landscape concerning food practices; and thirdly produces a body of work that helps envision the application of a contextual foodscape. This is done through engagements with site specific land based relationships in Porirua.

Unearthing is a key term defining itself through its practice. In this occasioning unearthing is discovered as the practice of forming a contextual awareness and narrative of a place by critically drawing different environmental, social, cultural and spatial relationships engrained within the landscape. It is a practice that focuses justice in its exposure of spatial relationships and landscapes that are under-appreciated, hidden, marginalised or dominated. Findings from unearthing are found to play out in vision making for a contextual foodscape in Porirua.

This research offers insight into food’s powerful role in environmental and spatial issues challenging current landscape practices . By allowing the practice of contextual foodscaping to enter landscape architecture, this research demonstrates how landscape practice can impact its design approaches to environmental and spatial injustice.
Addressing Social Issues Using Humors in Mayat (1978) Dramatic Text by Hatta Azad Khan
Authors: Ali Abdul Walid , Omar Saad , Ahmad Muhammad Faisal Bin
Published: January 2023

Objective: In the dramatic world, humour has been part of releasing tension for readers. Hatta Azad Khan is a renowned Malaysian dramatist who always addresses social issues in his writings. Mayat (1978) is one of his prominent writings that uses this technique by questioning capitalism and people, innuendo and money, and distrust using humour in the dramatic text. Post-1969, Sino-Malay sectarian violence, also known as the 13 May incident in Malaysia, has presented arts differently compared to early Malaysia's independence. Most writings in the post-13 May incident used symbolism and did not address issues literally. The writings also apply to Hatta's writings. The sensitivity of the racial tension has to be appropriately addressed since it resulted in a declaration of Malaysia's national emergency in the same year. Therefore, writing issues has to be done in some discreet inquiries.

Methodology: This qualitative research will analyse dramatic text and use Mayat (1978) as a subject study. Techniques used by the dramatist in addressing issues and humour will be explored to learn the writer's thoughts about social studies using drama and theatre as a medium.

Findings: Two main ideas in Hatta's writing are social space and social interpretation. The script is an imagination of the writer in a creative way discussing social issues. The intellectual discourse is done subtly in his writing without denying humour. Since both issues are always relevant, especially social space, Hatta's works are always performed by theatre productions even though the writing is done in the 70s.

Implications: As a social critic, Hatta uses drama and theatre as a medium of expression. More writings about social issues with good writing like Hatta's works are needed in the future to open more forums since addressing them is usually evergreen.
Impact of Bilingualism on the Process of Learning a Foreign Language
Authors: El Yazidi Rachid
Published: January 2023

Objective: This paper addresses the impact of being bilingual on the process of learning a particular foreign language. In other words, it seeks to illuminate the positive aspects of bilinguals over monolinguals while learning foreign languages. Based on several studies in the field of language acquisition, it has been revealed that bilinguals tend to be more experienced and capable than monolinguals by virtue of their rich linguistic and cultural repertoire that they possess.

Methodology: A group of bilingual and monolingual students at the university were sampled to find out the effect of bilingualism on the process of learning foreign languages. Questionnaires along with some tests were the main instruments employed in the analysis so as to examine the primary discrepancies between bilinguals and monolinguals in the learning outcomes.

Findings: The findings highlight and account for the positive impact of being bilingual.  Implications: Being exposed to an array of linguistic interactions within society does contribute in the development of a positive capacity, ability, willingness and aptitude in learning a new language.
Factors Influencing the Intention for Early Retirement: A Case Study Among Teachers at Secondary Cluster Schools in Dungun Terengganu
Authors: Muhammud Adida , Aziz Najdah Abd , Abu Bakar Rubiah , Harun Shahariah
Published: January 2023

Purpose: Teachers’ roles in delivering classroom instructions and executing lessons in this 21st century is much bigger than assumed by many who are not in the teaching field. Some people perceived teaching is a stressful job and those who do not have the passion would give up after a certain number of years. Many have opted for early retirement and this number has increased year by year. Thus, this study aims to analyze the factors (health, school management and workload) that influence teachers’ intention towards early retirement.

Design/Methodology/Approach: 152 teachers were chosen from four cluster schools in Dungun, Terengganu and online questionnaires were distributed among them using Stratified Random Sampling Method. The data was analyzed using SPSS. Findings: The results show only teachers’ health influence them towards early retirement intention. Meanwhile, the other factors are viewed as a challenge in the teaching world and would not influence them to opt for early retirement.

Implications/Originality/Value: This finding will assist the Ministry of Education in taking actions, to circumvent   teachers from leaving their profession before reaching the compulsory retirement age. As a result, the school’s management will focus on improved alternatives in managing the teachers’ welfare and controlling the factors of early retirement among teachers.
Efektivitas Musik Keroncong Terhadap Gangguan Tidur Lansia Dengan Hipertensi
Authors: Ashari Hasyim , Safitri Dwi Nur Rahmantika Puji , Khayati Nikmatul
Published: January 2023

Proses menua merupakan proses menghilangnya kemampuan jaringan lunak secara perlahan yang berfungsi untuk memperbaiki diri ataupun mempertahankan struktur fungsi tubuh sebagai mana normalnya sehingga pada proses menua seringkali tidak dapat bertahan terhadap paparan penyakit, infeksi dan memperbaiki kerusakan yang diderita. Semakin bertambahnya usia maka semakin bertambahnya resiko penyakit degenerative seperti jantung, stroke, ginjal dan hipertensi. Hipertensi adalah meningkatnya tekanan darah arteri yang secara terus menerus, hipertensi merupakan peningkatan tekanan darah sistolik diatas 140 mmHG dan tekanan diastolik lebih dari 90 mmHG. Indikasi yang biasa timbul pada penyakit hipetensi semacam sakit kepala, sesak nafas, mudah lelah, telinga berdenging dan penglihatan kabur, jantung berdebar, cemas dan insomnia. Insomnia adalah keadaan dimana tidak tercukupinya kebutuhan tidur selama 8 jam perhari. Terapi non farmakolohi yang dapapt dilakukan untuk menurunkan gangguan pola tidur dapat dilakukan dengan musik keroncong. terapi musik keroncong dengan menggunakan smartphone dengan waktu 15 – 30 menit.Studi kasus ini menggunakan deskriptive study dengan pendekatan proses keperawatan. kriteria studi kasus jeni kelamin perempuan, usia 65-78, memiliki gangguan pola tidur dengan skor wawancara kuisioner insomnia rating skale, kesadaran pasein kompos mentis, mampu berkomunikasi dengan baik dan tidak ada gangguan pendengaran.
The impact of accelerated electrons on volatile organic compounds in poultry and fish
Authors: Bliznyuk U. A. , Borshchegovskaya P. Yu. , Bolotnik T. A. , Ipatova V. S. , Nikitchenko A. D. , Khmelevsky O. Yu. , Chernyaev A. R. , Rodin I. A.
Published: January 2023

The necessity of developing safe methods of processing food products which improve the quality and extend their shelf life entails further scientific research aimed at increasing the efficiency of radiation processing of food products. Ionizing radiation causes lipid peroxidation in the items with a high fat and water content, such as chilled meat and fish products, which leads to formation of organic volatile compounds that render the food the specific flavor and smell. Gas chromatography-mass spectrometry is a technique that provides identification of chemical changes that actually occur in the product after irradiation. Experimental data on the content of organic volatile compounds in chilled turkey and salmon meat samples exposed to irradiation with 1 MeV accelerated electrons in the dose range from 0.25 to 2 kGy revealed both common and different trends in the behavior of dose dependences of alcohol, aldehyde and ketone contents in various types of chilled products. A proposed mathematical model based on the possibility of simultaneous occurrence of two competing processes, i.e., the decomposition of compounds due to their oxidation and the accumulation of compounds due to oxidation of other compounds after exposure to ionizing radiation match a dose dependent character of experimental data.
The choice of methods for lithium and boron determination in lithium-boron alloys
Authors: Kalinina A. A. , Konopkina I. A. , Vakhnina O. V. , Koroleva I V. , Zhogova K B. , Annikova S. A.
Published: January 2023

A lithium-boron alloy (LBA) with a high lithium content (up to 70%) is used as an anode material for molten salt batteries in chemical sources of current. We present a complex of developed techniques for determining mass fractions of free lithium, total lithium, and total boron in lithium-boron alloys containing lithium mass fractions no more than 70%, boron mass fractions — no less than 26%. Optimal conditions for preparation of LBA samples and subsequent free lithium extraction from them are determined. The developed techniques are intended for i) extraction-titrimetric determination of free lithium in a content range of 20 - 50% (the relative total error no more than 1.1%); ii) determination of the total lithium content using flame atomic emission spectrometry in a content range of 59.0 - 96.0% (the relative overall error no more than 2.7%; iii) determination of the total boron content by two methods, i.e., potentiometric titration within a content range of 5 - 40% (the relative total error no more than 1.3%) and flame atomic absorption spectrometry within a content range of 4.9-50.7% (the relative total error no more than 4.9%). The results of analysis of full-scale LBA samples for the content of free lithium, total lithium and total boron are presented. It is shown that the application of two techniques for the determination of total boron content in lithium-boron alloys makes it possible to get the convergent results within the limits of measurement errors. The developed techniques are certified by the metrological service of the enterprise and can be used for the incoming and process control of the LBA production.
Ultrasonic diagnostics in the study of coatings applied by gas-flame spraying
Authors: Berezin E. K. , Kornev A. B. , Rodyushkin V. M.
Published: January 2023

The quality control of coatings when selecting a powder material for the restoration of worn surfaces by gas-flame spraying is hampered by the lack of an operational method of non-destructive diagnostics. We present the results of studying coatings applied by gas-flame spraying using ultrasonic diagnostics. The powder coatings obtained using different technologies of gas-flame spraying were studied. Features of the structural state of coatings were evaluated using a model based on the effect of the structural inhomogeneities of the coating on the velocity and attenuation of ultrasonic waves. It is shown that the amplitude-time characteristics of the pulse of surface elastic waves when they pass along the coating are consistent with the data obtained from friction and hardness tests, the characteristics of the pulse being dependent on the quality of the coating material. The obtained results can be used to improve the quality control of coatings formed by gas-flame spraying.
Study of the radar absorption of metal-carbon nanocomposites (review)
Authors: Muratov D. G. , Kozhitov L. V. , Popkova A. V. , Korovin E. Yu. , Yakushko E. V. , Bakirov M. R.
Published: January 2023

Development of the technology for the synthesis of magnetic nanoparticles of metals and alloys has opened up the possibility of their use in the field of radar-absorbing materials (RAM). The results of studying the properties of nanocomposites, method for the synthesis of metal-carbon nanocomposites by pyrolysis using infrared heating are reviewed. The magnetic, electromagnetic, and radar-absorbing properties of the obtained nanocomposites depending on the synthesis temperature and metal concentration were studied. It is shown that the chosen metals, alloys (FeCo) and carbon material are effective for isolating magnetic nanoparticles when developing hybrid radar-absorbing composites. Moreover, methods for controlling the radar-absorbing properties of hybrid composites and the prospects for improving the impedance matching are considered. An analysis of the efficiency of absorption of electromagnetic radiation by FeCo/C nanocomposites synthesized by different methods is presented. The possibility of controlling the morphology and properties of metal-carbon nanocomposites using certain approaches to synthesis, varying the compositions of precursors, and the orientation of FeCo nanoparticles synthesized in the form of flakes in the composite has been revealed. The results of the study can be used to improve the technique of using FeCo/C nanocomposites obtained by pyrolysis of organometallic precursors based on polyacrylonitrile in the field of radar-absorbing materials.
Optical strain measurement technique for estimating degradation of the properties of carbon fiber reinforced polymer composites under cyclic loading
Authors: Panin S. V. , Bogdanov A. A. , Lyubutin P. S. , Eremin A. V. , Buslovich D. G. , Byakov A. V. , Shil’ko I. S.
Published: January 2023

The goal of the study is the fatigue process in polyimide-based composites reinforced with short carbon fibers. Parameters of mechanical hysteresis loops such as the loop area, secant and dynamic moduli were used in the study. Hysteresis loops were constructed using the developed hardware and software system based on the optical method of strain measurements using a digital image correlation (DIC) technique. Methods for calculating the moduli and the parameters of mechanical hysteresis loops is considered. The results of their evaluation and the experimental data on the fatigue behavior of polyimide-based composites reinforced with short carbon fibers are presented. It is shown that an important quantitative measure of the differences in the fatigue behavior of the studied composites is the hysteresis induced energy loss. For a composite with carbonized fibers, the energy loss level per cycle is 35 kJ/m3, whereas for a composite with graphitized fibers it is 34% lower (23 kJ/m3). At the same time, the fatigue durability of the latter is - 40 times lower. A decrease both in the secant modulus (up to 11%) and the dynamic modulus (up to 3.5%) was observed in cyclic tests. However, the reduction was twice as much in a composite with carbonized fibers possessing a longer durability. Thus, the DIC-based estimation of mechanical hysteresis loops by the parameters of the secant and dynamic moduli, as well as the loop area can be successfully used to interpret the difference in the fatigue characteristics at the stage of scattered damage accumulation, whereas an unambiguous prediction of the residual life appeared impossible. The problem requires further systematic studying using approaches of the fracture mechanics.
Optimization of sample preparation conditions in the determination of total arsenic in fish and seafoods by atomic absorption spectrometry with electrothermal atomization
Authors: Grachev S. A. , Tretyakov A. V. , Amelin V. G.
Published: January 2023

The conditions for sample preparation and determination of total arsenic in fish and seafoods by atomic absorption spectroscopy with electrothermal atomization have been optimized. When using a standard sample preparation procedure (GOST R 53100), a complete decomposition of the organic arsenic compound, arsenobetaine, appeared impossible which leads to underestimated results. A novel sample preparation procedure for the determination of total arsenic, including the addition of concentrated sulfuric acid for complete decomposition of the organic forms of arsenic to inorganic ones is proposed. During the atomization of the sample, an additional stage of drying was introduced with smooth heating from 200 to 250°C, which contributed to a complete removal of sulfuric acid residues from the injected sample volume. The correctness of the proposed methodology was verified using the ICP-MS method and in the analysis of reference samples of fish and seafoods.
Determination of interlayer crack resistance of stitched thin-sheet epoxy carbon composites using wedge delamination (wedging) technique
Authors: Babayevsky P. G. , Sinitsyn A. Yu. , Matyushevsky N. V. , Popov A. G. , Mazur V. V. , Sviridov A. G.
Published: January 2023

The local indices of the crack resistance of a thin-sheet reinforced polymeric carbon composite (CCM) stitched with glass and aramid threads with a double lockstitch were determined by wedging in the framework of linear elastic fracture mechanics under loading mode I using standard samples in the form of a double cantilever beam (DCB). Different number of stitches and stitching lines were used for different directions of crack propagation relative to the laying of the reinforcing fabric and stitches. It is shown that regardless of the type of stitching thread and the crack propagation direction, the average and normalized (relative to non-stitched samples) values of the local crack resistance parameters of stitched CCM samples mostly depend on the crack propagation area and on the density (pitch) of stitching responsible for a pronounced locality and anisotropy of the crack resistance. The highest resistance to crack propagation is observed in the areas of interweaving of the stitching threads as a result of additional energy consumption for deformation and breaking of stitching threads, and the lowest one is characteristic of the areas between stitches along the stitch or step between lines, both in the longitudinal and perpendicular directions of the crack propagation relative to the laying of the fabric and stitching lines. When evaluating the specific average values of the parameters of the local crack resistance of CCM samples related to one line of stitching with a longitudinal crack propagation or to one stitch when a crack propagates across the stitching lines, the effect of increased local crack resistance in the areas of interlacing of threads turns out to be significantly weaker, whereas this decrease in stitch areas and between the stitching lines is significantly more pronounced. For more accurate assessment of the crack resistance of a thin-sheet stitched CCM, it is advisable to determine and use specific local parameters taking into account scale effects.
A Walker-based mean strain correction models for low-cycle fatigue life prediction
Authors: Servetnik A. N.
Published: January 2023

A Walker-based mean strain correction model of low-cycle fatigue (LFC) life prediction is proposed for high loaded parts. The model is based on a function depending on the strain range and strain ratio controlled in the strain-controlled LCF test of fatigue specimens and a constant reflecting the material sensitivity to strain ratio. The independence from the stress cycle parameters which can change during the strain-controlled LCF test is an obvious advantage of the model. The model was verified using the results of strain-controlled LCF tests of smooth titanium alloy Ti-6A1-4V ELI and iron-based alloy specimens conducted at room temperature. The proposed model was compared to the Smith - Watson - Topper and Walker models that take into account the mean stress effect. The proposed model provided the best prediction accuracy for titanium alloy. For Iron-based alloys the results obtained by the Walker model and the model proposed are close to each other. A simplified model based on the analysis of model parameters tailing into account the mean strain effect for predicting fatigue life of aeroengine critical parts is developed using a limited amount of experimental data when only the results of Rε = 0 tests are known. A comparison of the predicted life with the number of cycles to failure showed satisfactory results of fatigue life prediction for Ti-6A1-4V ELI and Iron-based alloys specimens.
Generalized additive-multiplicative risk estimation model based on fuzzy and interval initial data
Authors: Orlov A. I.
Published: January 2023

Among the mathematical models of risk research, an important place is occupied by additive-multiplicative models of risk estimation. The components of such models are: three-stage hierarchical risk systems (built for a specific applied situation); partial risk estimators (determined by experts for a specific project, product, etc.); indicators of the weight of specific types of partial risks (found on the basis of a survey of experts in a particular application area); algorithms for calculating group risk estimators based on partial risk estimators and general risk estimator based on group risk estimators. As examples, three-stage hierarchical risk systems are considered in the production of a new innovative product and in the implementation of projects for the development of rocket and space technology. An algorithm for an additive-multiplicative model for risk estimation of a general form is proposed. Estimates of partial risks are products of weighting indicators by severity indicators, which corresponds to the well-known method of risk estimation in the form of the product of average damage by the probability of an undesirable event. Group risk estimators are built additively from i partial risk estimators, and the final overall risk estimator is calculated multiplicatively from group risk estimators. In previous works of the author, a special case of an additive-multiplicative risk estimation model was considered, in which, in particular, the components of the model were interpreted in terms of probability theory. It is proposed to carry out estimators of partial risks and weight coefficients on the basis of interval mathematics and fuzzy theory. The rules of arithmetic operations on interval and triangular fuzzy numbers are given. The application of the algorithm of the additive-multiplicative risk estimation model based on triangular fuzzy numbers is demonstrated using the example of risk estimation for the implementation of innovative projects. Within the framework of interval mathematics, risk estimators are considered in the implementation of projects for the development of rocket and space technology. The approach developed in this research article corresponds to the main provisions of the theory of stability of mathematical models of real phenomena and processes and to the results of systemic fuzzy interval mathematics.
Program of Community Service in Improving Children's Ability to Quran Recitation in Petuaran Hilir Village
Authors: Neliwati Neliwati , Nazmi Nazmi Wiki Kartika , Firly Mayanda , Sendi Muhammad , Nasution Syafiratunnisa
Published: January 2023

This study seeks to examine student participation in improving the ability to read the Qur'an for children in community service activities in the village of Petuaran Hilir. In encouraging the improvement of reading the Qur'an for children alone, as can be seen how the cultivation of reading is starting to become extinct in the current era, therefore it is necessary to cultivate it again to be diligent in reading, for that in this study it will be explained as to the right thing to increase a high level of interest in reading both in the field of religion and in the general field. In this study using the method of library research. The method is a process that has participation, together ness and involvement in both community groups or individual communities or social institutions based on public awareness directly or indirectly and does not have coercion from certain parties. The result of the study are obtains research data, here the researcher collects, analyze, on participant and reading the Quran.