bluuebunny/crossref_metadata_2025 huggingface dataset:
COMMUNITY STRUCTURE OF PHYTOPLANKTON AND CHLOROPHYLL-α CONCENTRATION IN THE SUNGAI MESJID VILLAGE DUMAI RIAU PROVINCE
Authors: Nugraha Rafiq Prima , Nurrachmi Irvina , Siregar Sofyan Husein
Published: April 2021

The research was conducted in December 2019 at Sungai Mesjid Village Dumai Riau Province. This study aims were to know the condition of water quality, know the structure of the phytoplankton community, know the concentration of chlorophyll-a and know the effect between chlorophyll-a concentration and phytoplankton abundance in waters. The method used in this study was a survey method. The research location is divided into 3 station points namely Bangsal Aceh, Marine Station and Jalan Dermaga. The results showed that the quality of waters classified as oligotrophic waters. Phytoplankton found in this study consisted of 4 classes and 12 species of phytoplankton and the abundance of phytoplankton has a range between 195.57 - 244.33 ind./l. Diversity index (H') ranges from 1.2951 - 2.1705, dominance index (D) ranges from 0.24 to 0.46 and uniformity index (E) ranges from 0.7825 to 0.9551. The chlorophyll-a concentration in waters of Sungai Mesjid Village in Dumai ranged from 0.0025 to 0.0210 mg/L. Phytoplankton abundance and chlorophyll-a concentration has a moderate effect, wherewith increasing chlorophyll-a concentration, phytoplankton abundance will also increase
HOTEL RESERVATION POLICY PADA MASA PANDEMI : REFUND, RESCEDULE ATAU CANCEL DI LABUANBAJO
Authors: Wardani Dyah Mustika
Published: April 2021

ABSTRAKDengan adanya pandemic, pembatalan pemesanan hotel meningkat, yang menyebabkan tergangunya operasional hotel dan menyebabkan banyak karyawan hotel yang akhirnya harus mengalami pemutusan hubungan kerja atau dirumahkan untuk sementara waktu. Penelitian ini dibuat untuk mengetaui apa saja yang menjadi pertimbangan tamu sehingga memutuskan untuk membatalkan pemesanan kamarnya, lalu bagaimana altenatif yang diberikan oleh hotel untuk mempertahankan agar tamu tetap memutuskan untuk datang di waktu yang lain. Metode penelitian yang digunakan dalam peneltian ini yaitu kualitatif. Sampel yang digunakan adalah hotel bintang 4 dan 3 dengan jenis hotel resort dan bisnis hotel yang ada di Labuan Bajo Nusa Tenggara Timur. Hasil penelitian menunjukkan bahwa altenative yang paling efektif digunakan yaitu melalui penjadwalan ulang pemesanan kamar dengan bentuk voucher yang dapat digunakan kapan saja tanpa batas waktu maksimal. Metode ini cukup efektif dalam membuat opeasional hotel tetap berjalan dan tidak merugikan tamu yang mengambil voucher tersebut. Kata kunci : Hotel , Pemesanan kamar, Kebijakan ABSTRACTWith the pandemic, cancellations of hotel bookings have increased, disrupting hotel operations and causing many hotel employees to end up being laid off or temporarily laid off. This research was made to find out what the guests considered so that they decided to cancel their room bookings, then how are the alternatives provided by the hotel to keep guests deciding to come at another time. The research method used in this research is qualitative. The samples used were 4 and 3 star hotels with the type of resort hotel and hotel business in Labuan Bajo, East Nusa Tenggara. The results showed that the most effective alternative to use was through rescheduling of room reservations in the form of vouchers that can be used anytime without a maximum time limit. This method is quite effective in keeping hotel operations running and not detrimental to guests who take the vouchers.  Keywords : Hotel , Reservation, Policy
DESAIN PERENCANAAN STRATEGI PENGEMBANGAN POTENSI WISATA KULINER DAN BELANJA KOTA BANDUNG
Authors: Pramezwary Amelda , Juliana Juliana , Hubner Ira Brunchilda
Published: April 2021

ABSTRAKKota Bandung merupakan kota Metropolitan terbesar di Jawa Barat dan juga merupakan ibu kota provinsi, serta pernah menjadi tempat terlaksananya Konferensi Asia Afrika 1955. Kota Bandung dengan segala potensi sumber daya yang dimilikinya dikenal akan wisata alam dan budayanya. Namun dengan perkembangan yang ada beberapa tahun terakhir ini, Bandung mulai dikenal juga melalui potensi wisata kuliner dan belanja yang dimilikinya. Bahkan Kementrian Pariwisata telah menetapkan Bandung sebagai salah satu destinasi unggulan wisata kuliner dan belanja di Indonesia. Namun demikian, masih ada beberapa masalah yang dihadapi seperti belum terintegrasinya kawasan-kawasan wisata belanja dan kuliner yang menyebabkan pengembangan belum optimal, kurangnya ketersediaan fasilitas transportasi, lahan parkir, dukungan promosi dan kerjasama antar pemangku kepentingan. Penelitian ini berupaya untuk mengidentifikasi potensi dan tantangan wisata kuliner dan wisata belanja dengan menggunakan metoda kualitatif deskriptif. Pengumpulan data akan dilakukan melalui focus group discussion terhadap stakeholder pariwisata di Kota Bandung. Hasil dari penelitian ini adalah penyusunan strategi pengembangan  wisata kuliner dan belanja kota Bandung.Kata Kunci : destinasi, perencanaan strategi, wisata kuliner dan belanja ABSTRACT Bandung is the largest Metropolitan city in West Java and is also the capital of the province, and was the venue for the 1955 Asian-African Conference. The city of Bandung with all its potential resources is known for its natural and cultural tourism. However, with the developments that have occurred in the last few years, Bandung has also begun to be recognized by its culinary and shopping potential. Even the Ministry of Tourism has designated Bandung as one of the leading destinations for culinary tourism and shopping in Indonesia. However, there are still a number of problems faced, such as not yet integrated shopping and culinary tourism areas which have resulted in not optimal development, lack of availability of transportation facilities, parking lots, promotional support and cooperation between stakeholders. This study seeks to identify the potential and challenges of culinary tourism and shopping tourism by using a qualitative descriptive method. Data collection will be carried out through focus group discussions on tourism stakeholders in the city of Bandung. The results of this study are the formulation of a strategy for the development of culinary tourism and shopping in the city of Bandung. Keywords: culinary and shopping tourism, destination,  strategic planning
Writing the African Diaspora in the Eighteenth Century
Authors: van Wyk Smith M.
Published: April 2021

The abolitionist debate, which peaked in Britain in the 1780s and ‘90s, elicited a number of works by black authors. These texts exhibit features which suggest that their authors were developing a diasporan consciousness, a sense of a community defining itself in contradistinction to a larger hegemony. Black voices obviously had been heard before in English writing; one thinks of more than just Othello or Oroonoko (see, for instance, Walvin, The Black Presence, Shyllon, and Dabydeen). From the appearance of the very first Portuguese, Dutch, and English chronicles of visits to the African west coast, from the fifteenth and sixteenth centuries onwards, sporadic attempts were made to record the thoughts and sayings of blacks. Their voices, however, are usually no more than asides in the colonial narrative. Such passages are invariably of the “they say” variety and, though one may sometimes detect what sounds like a genuine cadence or whisper of a non-Western point of view, these cannot demonstrably be proven to be other than fictitious. By the late eighteenth century such mediated accounts, either totally or partially fictitious, had become a major feature of abolitionist literature, as Wylie Sypher and many others since have shown.
Caught in a Strange Middle Ground: Contesting History in Salman Rushdie’s Midnight’s Children
Authors: Lipscomb David
Published: April 2021

Salman Rushdie wrote these words in 1982, and the defensive tone makes clear that his position as an “Indian” writer was less than secure long before the “Rushdie Affair” and the infamous fatwa complicated the issue of his location. An Indian Muslim, born in Bombay, Rushdie has made his home in England since he left India for Rugby School at the age of fourteen. His parents gave him a third homeland when they moved to Pakistan while he was at Rugby. Becoming a British citizen, earning a Cambridge degree, marrying a British woman, and later marrying an American have further complicated his expatriate status. That his right to draw on his Indian roots is not universally appreciated is made clear by looking at a few of the names his critics have recently called him, such as “a self-hating Indo-Anglian,” or “the overrated Eurasian writer,” or “a hireling of Indian origin,” or even “the totally assimilated and assimilable, Westernized, British-educated Asian intellectual” (Jussawalla 114).
Parental Financial Support and the Transition to Marriage for Young Adults in South Korea
Authors: Kim Phil-Suk , Lee Yun-Suk
Published: April 2021

Despite the importance of familial aspects for young adults getting married, most previous studies have not focused on the role played by downward transfers (i.e., parental financial support) in marriage. We therefore investigate how downward transfers are associated with young adults getting married in South Korea. We also examine whether these associations vary by gender and employment status among young adults. We use a sample of unmarried young adults older than 18 at baseline from the 2007–2016 waves of the Youth Panel (YP), a nationally representative longitudinal survey of 15-to 29-year-old young adults. We find that those who receive financial support from their parents are less likely to enter marriage and, further, we find that those receiving financial help from parents are much less likely to get married when they are men and unemployed.
Indirect Strategies for Disclosing the Genetic/Gestational Origins of Children Conceived by Means of Reproductive Donation (Spain)
Authors: Isabel Jociles María , Lores Fernando , Konvalinka Nancy Anne
Published: April 2021

This article is based on ethnographic research carried out in Spain, with families who have conceived their children using third-party intervention. It focuses on an aspect of these parents’ strategies regarding disclosure (or non-disclosure) of their children’s origins which has received very little attention in the research in this field: the indirect strategies implemented in contexts beyond the parents-children dyad. The parents use these strategies to establish an environment in which the child can create an image of her or himself as normal and non-exceptional, for which they intervene in their social networks mainly by controlling the information circulating through them and that, therefore, can reach the child. Three main contexts in which the parents implement these strategies have been identified: the extended family, the school, and family associations. The analysis of disclosure (or non-disclosure) strategies in these contexts provides some suggestions to improve professional intervention in this area.
“I Reported My Wife to Her Mother . . .” An Analysis of Transgressions Within Child- and Parent-In-Law Relationships in Ghana
Authors: Osei-Tutu Annabella , Affram Adjeiwa Akosua , Dzokoto Vivian Afi
Published: April 2021

We investigated transgressions in the context of in-law relationships in Ghana. In-laws form an integral part of the family structure in Ghana. However, psychological studies on in-law relationships in this country are rare. The current study interviewed thirty-seven individuals, aged between 32 and 76 who had been married between 2 and 59 years, from two regions in Southern Ghana. Through semi-structured interviews, participants described transgressions in-laws commit in the context of marriage. Interviews were recorded, transcribed verbatim and analyzed thematically. Findings revealed two major transgressions: role failure; and failure/resistance to changes in the in-law relationship. For children-in-law, failure to discharge roles as child bearers and meet financial obligations were considered as transgressions. Transgressions committed by parents-in-law include poor conflict handling, failures associated with customary postnatal care duties, privacy violations, and usurpation of daughter-in-law’s cooking rights. Findings have implications for couple and family interventions.
The Stages of Revising a Dissertation into a Book
Authors: Brown Amy Benson
Published: April 2021

As an academic writing coach and developmental editor, I have worked with scores of humanists and social scientists on successfully revising their dissertations into books. A first step in revision is understanding the distinctiveness of the academic monograph as a genre, particularly its requirements in terms of scope, voice, and through-line. In this article, I describe the common stages of reconceptualizing the project and revising the text, as well as the strategies I have found effective in helping authors move through the stages as adeptly and efficiently as possible. Drafting a book proposal is a challenging but often key step. Later stages include incorporating new research, revising and expanding some chapters and possibly cutting one or more, and soliciting feedback on the new articulations of ideas from colleagues. At every stage of this iterative process, authors need to have patience and compassion for themselves.
Semi-Percutaneous Short-Term Support of Right Heart Failure in Acute Aortic Dissection
Authors: Niclauss Lars , Niclauss Lars , Roumy Aurelien , Kirsch Matthias
Published: April 2021

Coronary malperfusion in acute aortic dissection type A is associated with increased mortality. The present case shows the management of a patient with an acute right ventricular infarction due to coronary avulsion, with the coronary bypass performed first, followed by aortic surgery and temporary extracorporeal right ventricular support, which was successfully weaned percutaneously after recovery while maintaining a low anticoagulation strategy.
STABILITY OF ALFVEN WINGS IN HMHD
Authors:   Facultad de Ciencias Astronómicas y Geofísicas-Universidad Nacional de La Plata,Paseo del Bosque s/n (1900), La Plata, Argentina, Sallago P. A.
Published: April 2021

A conducting source moving uniformly through a magnetized plasma generates, among a variety of perturbations,Alfvén waves. Alfvén waves can build up structures in the plasma called Alfvén wings. The wings have been detec-ted and measured in many solar system bodies, and their existence have been theoretically proved also. Under certainconditions, Hall and electronic pressure must be taken into account in the Ohm’s law and so one gets Hall Magne-tohydrodynamics (HMHD). In spite of Sallago and Platzeck have shown the existence of Alfvén wings in HMHD, theirstability under such conditions remains to be studied. The aim of this paper is to analyze the stability of an Alfvén wing,in the presence of an incompressible perturbation that has the same symmetry than the structure and polarization, inHMHD. Palumbo has developed an analytical method for the study of the stability of static structures with a symmetryin magnetized plasmas, in the presence of incompressible perturbations with the same symmetry than the structure.Since Alfvén wings are stationary structures, Sallago and Platzeck have shown the stability of such Alfvén wings in MHD conditions by extending Palumbo’s method. In the present paper this method is extended for Alfvén wings in HMHD conditions, and one concludes that in the presence of this kind of perturbations they are stable.
The Impact of E-Integrated Marketing Communication (E-IMC) on Brand Equity for New College
Authors: Fardiansyah Fardiansyah - , Rater Salya , Putra D.S
Published: April 2021

This research discusses the impact of the application of E-Integrated Marketing Communication (E-IMC) applied to new universities. This qualitative research refers to the theoretical reference written by John W. Creswell. The sample was determined using the snowball sampling technique and the data collection technique was carried out by in-depth interviews (in-depth interview) and documentation. This study aims to describe the impact of the application of integrated marketing communications applied by polytechnic universities. The findings indicate that user experience affects the E-IMC typology used. E-IMC affects brand equity in higher education. Further research can avail a research model and test the model with quantitative studies with the addition of demographic factors. Because the object of this research is a new polytechnic type of university, the different types of tertiary institutions can also be an additional variable to be studied further.
Lecrowdfundingsolidaire en contexte d’urgence
Authors: Chekkar Rahma , Renault Sophie
Published: April 2021

Dans le cadre de la crise sanitaire liée à la Covid-19, des organisations et particuliers ont choisi de mobiliser lecrowdfundingau service d’actions visant à venir en aide aux cibles impactées. En se basant sur l’analyse de 25 campagnes lancées surKissKissBankBanketUlule, la recherche, présentée dans cet article met en relief les spécificités et enjeux associés au recours à des plateformes de don moyennant contreparties pour soutenir des actions porteuses de solidarité dans des contextes d’urgence.
La résilience entrepreneuriale, un nouvel enjeu de formation ?
Authors: Académie de l’Entrepreneuriat et de l’Innovation
Published: April 2021

Dans quelle mesure la résilience entrepreneuriale peut-elle constituer un nouvel enjeu de formation des étudiants-entrepreneurs ? Forte d’une expérience de plus de 20 années au contact des acteurs de l’entrepreneuriat, l’Académie de l’Entrepreneuriat et de l’Innovation (AEI) a mobilisé son expertise, ses ressources et ses réseaux afin de répondre à cette question. La démarche proposée conduit à interroger la portée formative des outils et pratiques pédagogiques utilisés pour développer la résilience entrepreneuriale des étudiants-entrepreneurs, notamment dans le contexte d’accompagnement en distanciel apparu avec la crise de la Covid-19.
Etiologic structure of animal leptospirosis in the republic of sakha (Уakutia)
Authors: Koryakina L. P. , Nikitina A. A. , Pavlova A. I.
Published: April 2021

Over the period of research from 2003 to 2019 years, only 247 foci of leptospirosis of animals were registered in Yakutia, including: cattle – 61 (25.5 %), horses –159 (65.4 %), pigs –13 (5.3 %), small cattle – 8 (3.2 %), fur animals – 1 (0.4 %), bison – 4 (1.6 %). At the same time, a significant part of the foci of leptospirosis falls on horse breeding – 65.4 %. The largest number of disadvantaged points was established in 2008–49, including in horse breeding farms – 34 (69.4 %). An increase in the spread of the disease can be observed from 2003 to 2008 with a frequency of two years, and from 2008 – four years. Over the past 15 years, the introduction of leptospirosis pathogens has been established in 29 districts of the republic. It has been established that in the republic the main circulating serogroups of leptospirare Hebdomadis, Tarassovi, Icterohaemorrahagiae, Grippotyphosa, Canicola and Pomona. In zones of local economic stress, the source for the emergence and spread of leptospirosis are farms with a high number of farm animals. Of particular note are epizootic manifestations of leptospirosis in the Central Zone, which currently accounted for 80 % of the total quantity, in the remaining zones ranges from 2.5 to 7.5 %. It was revealed that the largest number of positive results was revealed in the spring period from April to June, and in the winter period – from November to December.
Research of properties of edible packaging based on apple puree with addition of dried fruit and vegetable raw materials
Authors: Makarova N. V. , Eremeeva N. В.
Published: April 2021

A technology has been developed for the production of edible packaging based on applesauce with the addition of dried fruit and vegetable raw materials. As a result of research, a technology was developed for the production of edible glasses based on applesauce with the addition of dried apples, apricots, cranberries, bell peppers, tomatoes, carrots, and beets. A comparative assessment of the organoleptic and physico-chemical parameters of edible glasses based on applesauce with the addition of dried fruit and vegetable raw materials. Organoleptic indicators, humidity, water absorption, resistance to model liquids (distilled water with a temperature of 20–25 °C; distilled water with an initial temperature of 90–95 °C; 5 % aqueous solution of sodium chloride with a temperature of 20–25 °C; 5 % aqueous citric acid solution with a temperature of 20–25 °C), microscopic examination of the surface. Thus, as a result of a study of the organoleptic and physico-chemical parameters of edible packaging based on apple raw materials with the addition of dried fruit and vegetable raw materials, it was found that the most optimal physico-chemical indicators and mechanical properties of the glass are observed at the highest degree of grinding of dried fruit / vegetable additives and increase the degree of coverage of the surface area of   the edible glass with the additive.
Content of biologically active substances in betula pendula bark in the novosibirsk region
Authors: Makukha V. V. , Bokova Т. I.
Published: April 2021

The main groups of biologically active substances contained in the bark of Betula pendula were determined by the spectrophotometric method: triterpene saponins, coumarins, hydroxycinnamic acids, tannins. It was found that the place of growth affects the content of triterpene saponins. There is an increase in their content from the anthropogenic load. A comparative analysis of the quantitative content of coumarins in samples of birch bark showed the similarity of indicators, so we can conclude that the place of growth does not significantly affect the content of coumarins. Studies have shown that all the samples under study accumulate approximately the same amount (about 1.5 %) of hydroxycinnamic acids. The difference between the content of the studied substances is small, but it exists. Studies of the content of tannins found that the place of growth of the hanging birch does not significantly affect this indicator. But with the increase in anthropogenic impact, we can note an increase in the content of this group of BAS. The study of the content of amino acids showed that the area of growth of the hanging birch affects their content in the bark. Anthropogenic factors also affect the content of amino acids, with an increase in the anthropogenic load on the growing area, the content of amino acids becomes higher.
Accumulation of heavy metals by wild and cultivated mushrooms (review)
Authors: Krasnikov A. V. , Selikhova V. S. , Krasnikova E. S.
Published: April 2021

The article is devoted to the problem of consequences of anthropogenic environment pollution with heavy metals and their salts. The review presents data on food products that most actively accumulate them. It is shown that edible wild-growing and cultivated mushrooms are classified as such. At the same time, there are no normative documents regulating the maximum permissible values of heavy metals content for wild mushrooms. Herewith, among the wild-growing mushrooms, there are species that are most prone to the heavy metals accumulation. According to the authors, the issue of studying the accumulation of heavy metals by fungi growing near cities with developed industry is relevant. It is required to develop methodological approaches for their detection in wild-growing edible mushrooms and regulatory documents regulating their admission to the retail network.
Сomparative evaluation of the effect of the bacterial biopreparation phytop 8.67–8 and the bacterial-humic complex agrofit-humate-b (bcg “afg-b”) on the growth and development of kiwano varieties green dragon
Authors: Pastukhova A. V. , Lavrishchev I. Е. , Petrov A. F. , Tsvetkova V. Р. , Maslenikova V. S.
Published: April 2021

The results of studying the influence of various biological and mineral fertilizers: Phytop 8.67, Agrofit-humate-B (BKG «AFG-B”) – on the growth and development of plants, as well as the yield and quality of kiwano fruits of the Green Dragon variety are presented. During the study, phenological and morphological observations, accounting and evaluation of the quality of the obtained fruits, analysis of the chemical composition of the fruits were carried out. The obtained data confirmed the positive effect of the use of biological preparations on the structure and quality of the resulting crop of kiwano, which will allow us to recommend this crop for cultivation in the territory of the Novosibirsk region, using experimentally proven methods and norms of fertilizer application during the growing season of plants.
The condition of piglet immune system during post-weaning period depending on the sex and stress-reactivity
Authors: Efanova N. V. , Gart V. V. , Zhuchaev К. V. , Osina L. M. , Batalova S. V.
Published: April 2021

The immune system of 90-day old piglets of SM-1 Novosibirsk breed piglets depends on sex and stress-reactivity. Stress-reactivity was measured using halothane test. The immunologic testing was performed 30 days after weaning. Our results show that overall piglet immune system demonstrated high proliferative activity of T- and B- immunocompetent cells with active formation of mature active T-and B-lymphocytes and did not show signs of immunosuppression. Compared to guilts, barrows had higher concentration of leucocytes, T-and B-lymphocytes, killer-supressor T-cells, activated and poorly differentiated T-lymphocytes. Gilts had higher production of inductor-helper T-cells, IgM and IgG when compared to barrows. Stress-resistant piglets had higher concentration of B-lymphocytes, IgM and IgG whereas stress-sensitive piglets had higher concentration of T-lymphocytes, supressor-killer T-cells and thymus T-lymphocytes. Gilts had higher concentration of inductor-helper T-cells than killer-supressor T-cells. Gilts overall had intensive antibody synthesis, however, stress-resistant gilts had higher IgG synthesis compared to stress-sensitive gilts. In barrows immature T-lymphocytes differentiated mainly into killer-supressor T-cells. The adaptivity of barrow immune system was characterized by high circulatory B-lymphocytes and IgM. Stress-sensitive barrows had lower antibody synthesis levels and higher T-lymphophoesis compared to stress-resistant barrows.
Nghiên cứu ảnh hưởng của nhiệt độ dưỡng hộ ban đầu đến cường độ nén của hệ nền xi măng chứa tro bay được hoạt hóa bằng natri sulfat
Authors: Trinh Bùi Phương , Thành Nguyễn Ngọc , Quyên Nguyễn Đình Phương , Hàng Đặng Thanh , Tuấn Lê Anh
Published: April 2021

Nghiên cứu này tập trung đánh giá ảnh hưởng của nhiệt độ dưỡng hộ ban đầu đến cường độ nén của hệ nền xi măng chứa 0 và 40% tro bay được hoạt hóa bằng natri sulfat (Na2SO4). Hàm lượng Na2SO4 là 0 và 4% theo khối lượng chất kết dính. Sau 24 h, các mẫu được dưỡng hộ ở các nhiệt độ khác nhau (27±2 oC, 60 oC và 100 oC trong lò sấy) trong 6 h. Dưỡng hộ ban đầu ở nhiệt độ cao đã cải thiện cường độ nén ở 3 ngày tuổi của mẫu chứa tro bay được hoạt hóa bằng Na2SO4. Tuy nhiên, cường độ nén ở 7 ngày và 28 ngày tuổi của các mẫu này lại thấp hơn khi so với mẫu được dưỡng hộ ở 27±2 oC. Điều này chứng tỏ rằng dưỡng hộ ban đầu ở nhiệt độ cao đã ảnh hưởng bất lợi đến cường độ nén về sau của hệ nền xi măng chứa tro bay được hoạt hóa bằng Na2SO4.

Từ khóa:

chất hoạt hóa; cường độ nén; độ linh động; hệ nền xi măng; natri sulfat; nhiệt độ dưỡng hộ ban đầu; thời gian ninh kết; tro bay.
Nghiên cứu thực nghiệm ảnh hưởng của tỷ lệ sử dụng cốt liệu lớn tái chế đến sự phát triển cường độ nén và mô đun đàn hồi của bê tông theo thời gian
Authors: Quang Nguyễn Thanh , Cường Trần Viết , Tân Nguyễn Ngọc , Tân Nghiêm Hà , Giang Nguyễn Hoàng
Published: April 2021

Ở các thành phố lớn như Hà Nội, Hồ Chí Minh phát sinh một lượng lớn chất thải rắn xây dựng (CTRXD) từ việc phá dỡ các công trình cũ, cũng như xây dựng các công trình mới. Chính phủ đã có những quy định về thu gom và tái chế CTRXD để tái sử dụng nhằm bảo vệ môi trường qua thông tư 08/2017/TT-BXD, mới nhất là chỉ thị 41/CT-TTg về một số giải pháp cấp bách tăng cường quản lý chất thải rắn. Nghiên cứu này trình bày các kết quả thực nghiệm thu được trên các mẫu bê tông sử dụng cốt liệu lớn tái chế (CLLTC) từ CTRXD với các tỷ lệ sử dụng lần lượt là 0%, 50% và 100% thay thế cho cốt liệu lớn tự nhiên (CLLTN). Những kết quả chỉ ra rằng cường độ nén ở 28 ngày tuổi của bê tông tái chế bị giảm từ 9,5 – 16,0%, trong khi đó mô đun đàn hồi bị giảm từ 12,8 – 24,2% khi so sánh với bê tông cốt liệu tự nhiên. Ảnh hưởng của hàm lượng CLLTC đối với cường độ nén ít hơn đối với mô đun đàn hồi. Mô đun đàn hồi của bê tông tái chế giảm tuyến tính khi tăng tỷ lệ sử dụng CLLTC.

Từ khóa:

bê tông tái chế; cường độ nén; mô đun đàn hồi; cốt liệu lớn tái chế; chất thải rắn xây dựng.
Ứng dụng mạng trí tuệ nhân tạo tìm cốt liệu tương đương cho bài toán tính hệ số dẫn hiệu quả của vật liệu không đồng nhất
Authors: Như Nguyễn Thị Hải
Published: April 2021

Tính chất của các vật liệu không đồng nhất có thể được tính nhanh sử dụng các công thức xấp xỉ. Các công thức này thường chỉ áp dụng cho các trường hợp có hình dáng cốt liệu đơn giản như hình tròn và hình cầu. Trong các vật liệu thực, cốt liệu có thường có hình dáng phức tạp hoặc rất phức tạp. Mô tả đầy đủ hình dáng vật liệu bằng phương pháp phần tử hữu hạn có thể đòi hỏi lưới chia rất mịn hoặc cần dùng đến các kỹ thuật hỗ trợ khác nếu dùng phương pháp phần tử mở rộng, việc này tiêu tốn thời gian và công sức tính toán. Bài báo này ứng dụng mạng trí tuệ nhân tạo để tìm cốt liệu tương đương có hình dạng đơn giản. Với cốt liệu tương đương, các công thức giải tích tính nhanh các hệ số dẫn có thể được áp dụng nhằm đơn giản hóa bài toán.

Từ khóa:

hệ số dẫn; vật liệu không đồng nhất; cốt liệu tương đương; mạng trí tuệ nhân tạo.
Đánh giá công nghệ quan trắc nghiêng bằng thiết bị Portable Tiltmeter ở Việt Nam
Authors: Dũng Lương Ngọc , Quỳnh Bùi Duy , Khánh Phạm Quốc , Long Hoàng Văn , Oanh Dương Thị
Published: April 2021

Trong một vài năm trở lại đây, tại Việt Nam xuất hiện công nghệ đo nghiêng bằng Tiltmeter giúp quan trắc nghiêng công trình rất hiệu quả, đặc biệt là các công trình được xây dựng trên khuôn viên nhỏ, chiều cao lớn. Đây là một phương pháp đo nghiêng mới nhưng chưa có những tiêu chuẩn Việt Nam quy định và những nghiên cứu đánh giá về hiệu quả của công nghệ. Trong bài báo này, tác giả giới thiệu công nghệ quan trắc nghiêng Tiltmeter về cách thức đo đạc và tính toán; phân tích, so sánh công nghệ Tiltmeter với phương pháp đo khoảng cách ngang khi xác định nghiêng kết cấu thẳng đứng và phương pháp đo cao thủy chuẩn hình học khi xác định nghiêng kết cấu nằm ngang giúp đánh giá khả năng áp dụng của phương pháp này. Thực nghiệm xác định nghiêng một kết cấu thẳng đứng cao 3 m, cho kết quả giá trị độ lệch ngang giữa hai phương pháp là 1,8 mm/1 m và 0,2 mm/2 m tương ứng giá trị lệch góc khoảng 6’ và 21”. Thực nghiệm xác định nghiêng cho kết cấu nằm ngang, kết quả giữa hai phương pháp gần như đồng nhất, với giá trị lệch ngang 0,2 mm/0,103 m, tương đương giá trị lệch góc khoảng 6’.

Từ khóa:

quan trắc nghiêng; thiết bị Tiltmeter; nguyên lý đo nghiêng Tiltmeter; GeoKon; GeoSlope.
Дібровське родовище – типовий представник комплексного TR-U-Th зруденіння Приазовської металогенічної області Українського щита
Authors: Sukach V. V. , Shpylchak V. O. , Hrinchenko O. V. , Bondarenko S. M. , Isakov L. V. , Somka V. O.
Published: April 2021

У межах Оріхівсько-Павлоградської структурно-металогенічної зони (СМЗ) Приазовської металогенічної області вирізняється новий Вовчанський урановорудний район. Він представлений Дібровським TR-U-Th родовищем та низкою мало вивчених рудопроявів. Зруденіння Дібровського родовища за віковим, геолого-структурним і речовинним критеріями можна зарахувати до калій-уранової формації метасоматичного типу. Як аналоги розглянуто родовища й рудопрояви Центральноукраїнського урановорудного району. Продуктивна TR-U-Th мінералізація сформувалася в палеопротерозої 1,9–2,2 млрд років тому. Вона була генерована гідротермально-метасоматичними процесами, які супроводжували проникнення апліт-пегматоїдних гранітів дібровського типу (салтичанського комплексу?). Результати датування за методикою CHIME монациту й украплень уранініту в ньому підтверджують палеопротерозойський вік їхнього утворення: 2085–2115 млн років. Водночас імовірна участь у формуванні рідкісноземельної мінералізації мезоархейських гранітоїдів январського типу на дорудному етапі.
Ідентифікація транскордонних масивів підземних вод (Україна – Білорусь, басейн Дніпра)
Authors: Sanina I. V. , Lyuta N. G.
Published: April 2021

Нещодавнє дослідження “Ідентифікація та розмежування підземних водних об’єктів у басейні річки Дніпро в Україні” під егідою проєкту ЄС “Водна ініціатива Європейського Союзу плюс для країн Східного партнерства (EUWI+)” виявило вісім масивів підземних вод (МПВ) у басейні річки Дніпро в Україні. Вони транскордонні й пов’язані із шістьма відповідними МПВ у басейнах Прип’яті та Дніпра Республіки Білорусі. Деякі із цих МПВ дуже великі, тому наступне дослідження було зосереджено на виявленні частин МПВ з транскордонною взаємодією в їхніх межах. Аналіз впливу робочих водозаборів засвідчив, що транскордонну зону доцільно обмежувати 50-кілометровою смугою вздовж кордону з обох боків. З’ясовано, що умови формування підземних водних ресурсів у транскордонній українсько-білоруській зоні в басейні Дніпра дуже сприятливі. По-перше, транскордонна територія розміщується в зоні надмірного зволоження, тож як напірні, так і безнапірні МПВ мають інфільтраційне живлення. По-друге, українська частина території, де відбувається живлення напірних МПВ, має мінімальне антропогенне навантаження. Як наслідок – кількісний і якісний стан МПВ у транскордонній зоні переважно добрий. Водночас є спільні проблеми, що потребують відновлення моніторингу підземних вод та узгодження його процедури з білоруською стороною.
Перспективи видобутку золота в межах Українського щита (на прикладі Майського родовища золота)
Authors: Rudko H. I. , Karly V. E.
Published: April 2021

Розглянуто головні аспекти перспектив і шляхів створення золотодобувної галузі України як джерела наповнення золото-валютних резервів і складової частини високотехнологічного виробництва. Висвітлено останні тенденції ЄС щодо гірничодобувної промисловості. Наведено стислі відомості щодо золотоносності архейсько-протерозойських комплексів світу. Надано геологічну характеристику найвивченіших золоторудних проявів Українського щита (УЩ), на яких можливо розпочати видобуток. Показано подібність проявів УЩ до відомих докембрійських золоторудних родовищ світу. На прикладі Майського родовища охарактеризовано стан вивчення й комерційну привабливість золоторудних об’єктів УЩ для подальших робіт. Розглянуто методичні підходи під час проведення геолого-економічної оцінки золоторудних об’єктів. Окреслено основні невирішені проблеми під час проведення досліджень і способи їхнього розв’язання.
USING THE CUDA TECHNOLOGY TO SPEED UP COMPUTATIONS IN PROBLEMS OF CHEMICAL KINETICS
Authors: Sarsembayev M. , Urmashev B. , Mamyrbayev O. , Turdalyuly M. , Sarsembayeva T.
Published: April 2021

The main idea of the implementation is reducing the time for calculation and thereby implement a multi-user mode for users by placing it on a server with access via a web browser. To model the kinetics of chemical reacting systems were used 4th and 5th grade Runge-Kutta methods and to receive the index of advantages of this elaboration were written programs in C# for sequential computation on a central processor and was used a platform for parallel computation of CUDA on graphic processors. Parallelization of data during calculation on a GPU was performed by the distribution of the reaction to individual strands, when changes of the concentration was calculated over a given time interval of a certain substance. Parallelization is performed over all elementary reactions, with the increasing of the number of reactions in the mechanism, because of this the computation on the GPU has a noticeable gain in time.
ALGORITHMS FOR EVALUATING THE EFFICIENCY OF THE BUSINESS PROCESSES OF ENTERPRISE BASED ON A BALANCE SCORE CARD
Authors: Israilova S. , Mukhanova A. , Satybaldiyeva A.
Published: April 2021

The article presents an algorithm for analyzing and evaluating the effectiveness of business processes of enterprises. Modern enterprises must have a well-thought-out and effective system of managing their activities for sustainable competitiveness, which can be achieved on the basis of certain methodological approaches. The profit that is the purpose of the functioning of Kazakhstan enterprises in many cases cannot be obtained, due to the incorrect operation of business processes and the allocation of appropriate resources. Constant modernization of enterprises is a financially costly solution to the problem of ensuring planned income. At the same time, the modernization of the enterprise should be carried out only after a deep analysis and assessment of the "bottlenecks" of the company's business processes. The purpose of the study is to determine the methodology for analyzing and evaluating the business processes of Kazakhstani enterprises in the field of service provision. The proposed methodology is designed to identify "problem" areas of specific business processes by calculating weighted average, integral and generalized indicators of efficiency and effectiveness. This allows you to assess the state of both individual business processes of enterprises and their totality, as well as to set priorities for management actions to improve them. While previous research has attempted to use tools and models to visualize technological business planning, limited previous research has focused on strategic planning modeling. Due to the problems associated with the lack of guidelines for business strategy modeling, a holistic approach is needed. Using the balanced scorecard evaluated the efficiency and effectiveness of business processes on criteria and indicators allow you to monitor current activity and to evaluate the effectiveness of its operations at any time.
SYSTEMS FOR MONITORING THE PRODUCTIVITY OF DAIRY FARM ANIMALS
Authors: Shopagulov O. , Tretyakov I. , Ismailova A. , Gostin A.
Published: April 2021

The relevance of this project lies in the fact that the use of modern digital, informational and intelligent technologies makes it possible to keep records of dairy productivity quickly and to respond to changes in the health of livestock in a timely manner. The result will increase the efficiency of resource potential use, as well as profitability and attractiveness of dairy cattle breeding for investors. The systems developed will also enable agricultural producers to make concrete decisions based on automated data analysis. The high quality of milk in the dairy farming industry, taking into account the feedback from the household to the consumer, ensures the competitiveness in the direction of the dairy industry. The article describes in detail a mathematical model for automating on-farm production control of dairy products, which will have an impact on the leveling of the commodity market. Also there are described the results of implementation of already developed software products for accounting of animal status on dairy farms of Northern Kazakhstan. As a result, some recommendations for the use of the developed software are given. In this way detailed results have been described for each farm, indicating the characteristics and status of the farms to date. The results obtained will be studied and considered by farmers at the local level to organise production processes. The implementation of this task will take place at the Seyfullin Kazakh Agrotechnical University. We have established a scientific group to develop and implement IT solutions for a large number of processes in agricultural production. This scientific programme is the first integrated solution aimed at introducing and adapting best practices in the application of digital technologies in dairy farming in Northern Kazakhstan.
DEFINITION OF APPLICATION FIELD OF THE STAND FOR THE VIDEO MONITORING SYSTEMS INVESTIGATION
Authors: Safin R. , Amreev M. , Pavlova T. , Temyrkanova E. , Garmashova Y.
Published: April 2021

The paper presents the results of determining the areas of application of a laboratory stand designed for studying and researching CCTV systems. The necessity of research of video cameras of the security alarm system, their testing at the organization of production and expediency of carrying out laboratory works by students of higher education institutions studying security systems is shown. The state of affairs in this area in post-Soviet countries is shown. Some requirements of the State educational standard on informativeness and expansion of opportunities of laboratory stands are given. The input parameters necessary for the design of video camera research stands are considered. The results of the study of the developed laboratory stand for the study and study of security television systems and the definition of areas for its application are presented. The structure of the stand and its parts is proposed. Developed recommendations for its use are given. The experience of conducting laboratory work on the study of the characteristics of security alarm cameras is analyzed. The possibility of studying robust filtering on the noise immunity of the video system, the influence of the illumination spectrum on the main qualitative characteristics of the video camera using the proposed stand is shown. A list of suggested to run the stand includes laboratory work “Studying the parameters, operation modes and configuration of video surveillance system NOVUS”, “the Study of possibilities of various types of cameras when changing the light and characterization of the sensitivity of various types of cameras, Definition of focal length, angle of view and resolution of different types of cameras and lenses, Definition of the working area of observation, the far and the dead zone for various types of cameras and lenses”, "Determination of conditionally dead zones for different recording speeds of the DVR and at different focal lengths” and" Determination of the volume and quality of recorded information from the value of the recording speed of the DVR”, as well as research works “The signal processing with variable spectrum”, “the Influence of robust filtering for noise immunity video”, “Influence of illumination spectrum on the main qualitative characteristics of the camera” and “Comparative performance of analog and digital cameras.”
EFFICIENCY OF REGISTRATION OF LOW ENERGY NEUTRONS BY NEUTRON DETECTORS BASED ON GAS DISCHARGE 3He COUNTERS
Authors: Vildanova L.I. , Novolodskaya O.A. , Sadykov T. Kh. , Kantarbayeva D.O.
Published: April 2021

When analyzing the results obtained in measurements on neutron detectors with a low energy threshold, it is necessary to know the dependence of the neutron detection efficiency on their kinetic energy in information channels of various types, both for "open" neutron counters, and for counters surrounded by a moderator. Having a physical model of particle interactions based on the Geant4 package, it is possible to calculate the detection efficiency for various types of detectors, which are used in experiments conducted at the Tien Shan high-mountain station related to the registration of a neutron flux. The paper presents several simulation models developed for neutron detectors.
PREDICTING THE LIFETIME OF LORA BASED WIRELESS SENSOR NETWORKS USING A PROBABILISTIC MODEL OF MARKOV CHAINS
Authors: Nurgaliyev M. K. , Saymbetov A. K. , Zholamanov B. N. , Yeralkhanova A. Т. , Zhuman G. B.
Published: April 2021

Real-time monitoring systems and sensors are not complete without wireless data transmission modules. Improving energy efficiency requires examining various system parameters that affect the power consumption of transmitting and receiving devices. The most important parameter of any autonomous wireless network is its uptime. In this work, we used LoRa wireless modules on the SX1278 chip manufactured by Semtech to determine their power consumption in various operating modes. The obtained data were used to build a consumption model of the device when connected to a receiver. Three operating modes are considered: transmit mode, receive mode and sleep mode. In an ideal communication channel, all transmitted data reaches the receiver with 100% probability. In a real situation, data reaches the receiver with a certain probability, depending on the communication channel, transmission power, distance to the addressee, and network parameters. In this work, the occurrence of an error is random. In this case, the occurrence of an error during reception entails a lack of confirmation of receipt or a request for re-sending data. Sending data again increases the power consumption of the device and, consequently, decreases the operating time of the wireless device. This paper shows the dependences of the operating time on various initial monitored parameters of the device, such as: confirmation timeout, packet length, time of one transmission cycle and the maximum number of retransmissions in one cycle. The developed model for predicting the consumption of the device can be used in the design of autonomous wireless sensor monitoring networks.
MULTI-LINE SOLITON SOLUTIONS FOR THE TWO-DIMENSIONAL NONLINEAR HIROTA EQUATION
Authors: Bekova G. T. , Zhadyranova A. A.
Published: April 2021

At present, the question of studying multidimensional nonlinear integrable equations in the framework of the theory of solitons is very interesting to foreign and Kazakh scientists. Many physical phenomena that occur in nature can be described by nonlinearly integrated equations. Finding specific solutions to such equations plays an important role in studying the dynamics of phenomena occurring in various scientific and engineering fields, such as solid state physics, fluid mechanics, plasma physics and nonlinear optics. There are several methods for obtaining real and soliton, soliton-like solutions of such equations: the inverse scattering method, the Hirota’s bilinear method, Darboux transformation methods, the tanh-coth and the sine-cosine methods. In our work, we studied the two-dimensional Hirota equation, which is a modified nonlinear Schrödinger equation. The nonlinear Hirota equation is one of the integrating equations and the Hirota system is used in the field of study of optical fiber systems, physics, telecommunications and other engineering fields to describe many nonlinear phenomena. To date, the first, second, and n-order Darboux transformations have been developed for the two- dimensional system of Hirota equations, and the soliton, rogue wave solutions have been determined by various methods. In this article, we consider the two-dimensional nonlinear Hirota equations. Using the Lax pair and Darboux transformation we obtained the first and the second multi-line soliton solutions for this equation and provided graphical representation.