bluuebunny/crossref_metadata_2025_split huggingface dataset:
Pemetaan Pulau Kecil Gelasa Kabupaten Bangka Tengah
Authors: Adi Wahyu 
Published: August 2019

Pulau Kecil Gelasa merupakan daerah yang belum banyak diteliti. Pemetaan ekosistem di pulau kecil dilakukan dengan bantuan citra Advanced Land Observing Satellite (ALOS). Penelitian terdahulu diketahui bahwa ALOS memiliki kemampuan memetakan terumbu karang dan padang lamun di perairan dangkal serta mampu memetakan kerapatan penutupan vegetasi. Metode interpretasi citra menggunakan alogaritma indeks vegetasi pada citra ALOS yaitu NDVI (Normalized Difference Vegetation Index), serta pendekatan Lyzengga untuk mengkoreksi kolom perairan. Hasil penelitian didapatkan luasan Padang Lamun di perairan dangkal 41,99 Ha, luasan Terumbu Karang 125,57 Ha. Hasil NDVI di daratan/ pulau kecil Gelasa untuk Vegetasi Rapat seluas 47,62 Ha; luasan penutupan Vegetasi Sedang 105,86 Ha; dan penutupan Vegetasi Jarang adalah 34,24 Ha.

Small Island Gelasa rarely studied. Mapping ecosystems on small islands with the image of Advanced Land Observing Satellite (ALOS). Previous research has found that ALOS has the ability to map coral reefs and seagrass beds in shallow water, and is able to map vegetation cover density. The method of image interpretation uses the vegetation index algorithm in the ALOS image, NDVI (Normalized Difference Vegetation Index), and the Lyzengga approach to correct the water column. The results of the study were obtained in the area of Seagrass Padang in the shallow waters of 41.99 ha, the area of coral reefs was 125.57 ha. NDVI results on land / small islands Gelasa for dense vegetation of 47.62 ha; area of Medium Vegetation coverage 105.86 Ha; and the coverage of Rare Vegetation is 34.24 Ha.
POLYPROTIC ACIDS IN SOLUTION: IS THE INVERSION OF THE CONSTANTS OF STEPWISE DISSOCIATION POSSIBLE?
Authors: Mchedlov-Petrossyan Nikolay 
Published: August 2019

The paper is devoted to the problem of the ratio of the constants of stepwise dissociation of polyprotic acids in solution. Special attention is paid to the problem of close dissociation constants and in particular to the possibility of the inversion of constants, for example, Ka1 < Ka2 (or pKa1 > pKa2) for equilibria H2A ⇄ HA– ⇄ A2–, H2A+ ⇄ HA ⇄ A– or H2A2+ ⇄ HA+ ⇄A. Equilibria of inorganic and organic acids are successively considered. Some cases of inversion are considered. In particular, such relations are sometimes observed for fluorescein and phthalein compounds, and for porphyrins. In the last case, as well as in some other systems the acid-base reactions proceed relatively slow. An overview of approaches to estimation of the Ka1/ Ka2 ratio is presented. Namely, these approaches use the concepts of the detailed equilibrium scheme, dissociation microconstants, statistical and electrostatic factors, and the influence of intra-molecular hydrogen bonds. The variety of reasons for additional stabilization of the forms H2A (or H2A+, or H2A2+) and A2– (or A–, or A) and destabilization of the form HA– (or HA, or HA+) is regarded, including salt effects and ionic association. Peculiarities of stepwise protolytic equilibria of macrocyclic compounds, such as calixarenes, porphyrins, and cryptands, are considered. Dispersed systems such as polyelectrolytes, micelles of functionalized surfactants, monolayers, silica and modified silica, other oxides, nanodiamonds decorated by carboxylic groups, represent a peculiar type of polyprotic acids. In this case, a “spectrum” of pKa values appears because of influence of ionized functional groups on the properties of un-dissociated ones. It was demonstrated that such unusual ratio of constants, Ka1 < Ka2, may be caused by a set of factors, among which most important are (i) the tautomerism in true solutions and (ii) selective binding of different equilibrium forms in organized solutions, i.e., in micellar solutions of surfactants, suspensions of phospholipid liposomes, and related systems.
SYNTHESIS AND OPTICAL PROPERTIES OF NANOCOMPOSITES BASED ON LIQUID CRYSTAL WITH BIMETALLIC Au + Ag NANOPARTICLES OF ALLOY TYPE.
Authors: Mirnaya Tatiana , Yaremchuk Galina 
Published: August 2019

In this work, we have carried out a research which aimed to obtain complex nanoparticles of noble metals Au + Ag in the form of bimetallic alloys. Bimetallic nanoparticles were synthesized directly in a liquid-crystalline cadmium caprylate melt in an argon atmosphere in the temperature range of mesophase existence by the simultaneous chemical reduction of cations of gold (Au3+) and silver (Ag+) from their compounds, tetrachloroaurate acid (H[AuCl4]×3Н2О) and silver nitrate AgNO3, respectively.
The effect of synthesis duration (3 and 5 hours) on the spectral behavior of binary nanoparticles have been studied. It has been shown that when the synthesis duration is 3 h, mainly homogeneous bimetallic alloys are obtained, and when it is 5 h, both homogeneous and gradient alloys can be obtained. The absorption spectra of homogeneous alloys are characterized by the presence of one surface plasmon resonance (SPR) peak, which occupies an intermediate position relative to the SPR peaks for monometallic nanoparticles, i.e. between 425 and 560 nm. When forming heterogeneous alloys, which are formed in the molar ratio range where the amount of silver ions predominates, the absorption spectra exhibit two SPR peaks which relate to nanoparticles with different metallic silver content. The formation of metallic nanoparticles containing different metals may be due both to the different mobility of noble metals ions in the liquid crystal matrix and to the different rate of rearrangement of metals in the new formed heteronanoparticle.
It has been found by electron spectroscopy and transmission electron microscopy that the nanoparticles in this matrix have mostly a spherical shape with a mean diameter of 15 nm. The possibility of the fine control of the position of SPR peak of bimetallic nanoparticles in a liquid crystal matrix over a wide optical range of 422–580 nm is shown.
Synthesis of condensed cobalt (II)-zinc phosphate with the concrete anionic composition
Authors: Kochkodan Olha , Antraptseva Nadiya , Kozachuk Tetiana 
Published: August 2019

Сondensed cobalt(II)-zinc phosphates with the concrete anionic composition (with а linear structure of anion with = 2–8 of the general formula (Co1-хZnх)(n+2)2PnO3n+1, 0<х<1.00, and a cyclic with = 4 – (Со1-xZnx)2P4O12, 0<x<1.0) were synthesized by heat treatment in the isothermal conditions of crystallohydrates of composition Со1-хZnх(H2PO4)2·2H2O (0<x<1.00).
The heat treatment of Со1-хZnх(H2PO4)2·2H2O (0<x<1.00) was carried out in the air in the range of 100–350 °C (± 5 °). The sample was maintained at a predetermined temperature for 0.5, 1.5, 3.0, 5.0 and 7.0 hours. Heat treatment products were identified using a set of analytical methods: chemical, X-ray, IR spectroscopy, quantitative chromatography on paper.
It has been determined that the formation of condensed phosphates in products of heat treatment Со1-хZnх(H2PO4)2·2H2O (0<x<1.00) at 100 °C for 0.5–3.0 h does not occur. The processes of anionic condensation begin under the heat treatment for 5.0–7.0 h at 100 °C and deepen for further temperature rise.
With the increase in the duration of heat treatment at 150 °C to 3.0–7.0 h, the formation of condensed phosphates with a linear structure of anion with a degree of polycondensation = 2–5 of the general formula (Со1-хZnх)(n+2)2PnO3n+1. is recorded. The degree of conversion of monophosphate anion to polyphosphate is 61-73%, respectively. Similar changes in the composition of heat treatment products are realized with the destruction of the structure and complete amorphization of the solid phase. The formation of a new crystalline lattice is recorded at 225 °C.
The sample, which lasts 0.5 h, is a crystalline phase identified as Со1-хZnхH2P2О7 with an admixture of Со1-хZnхP2О7. The maximum amount of diphosphate (52.9 % of the total content of P2O5) is formed during the firing of Со1-хZnх(H2PO4)2·2H2O for 1.5 h at 225 °C. The amount of diphosphate is reduced by almost 2 times during heat treatment for 7.0 hours. Similar changes in the composition of linear condensed phosphates are observed at 275 °C: with the increase in the duration of heat treatment the number of low-molecular phosphates with = 2–4 decreases, the high-molecular with = 5–8 of the general formula (Со1-хZnх)(n+2)2PnO3n+1 increases . Fosted condensed phosphate with a cyclic structure of the anion with = 4 – cyclotetraphosphate of the composition (Со1-хZnх)2Р4O12 . It increases the temperature to 350 °C and becomes the only heat treatment product.
Quantitative dependences of the content of condensed phosphates with different anion structure and phosphate acids, which released as intermediate products, on the temperature regime and roasting duration were established.
The influence of cation nature on the conditions of synthesis and quantitative composition of the condensed phosphates of cobalt(II)-zinc with concrete anionic composition (with а linear structure of anion with = 2–8 of the general formula (Co1-хZnх)(n+2)2PnO3n+1, 0<х<1.00, and a cyclic with = 4 – (Со1-xZnx)2P4O12, 0<x<1.0) is shown.
SYNTHESIS, PROPERTIES CaCu3Ti4O12 WITH COLOSSAL VALUE OF THE DIELECTRIC PERMITTIVITY
Authors: Konchus Boris , Yanchevskiy Oleg , Belous Anatolii , V'yunov Oleg 
Published: August 2019

Ceramic materials CaCu3Ti4O12 were synthesized by solid-phase reactions technique. The sequence of chemical reactions during the synthesis has been determined. Phase CaCu3Ti4O12 appears at 700 °C. At 800 – 900 °C, the intermediate phases CaTiO3, CuTiO3 and Ca3Ti2O7 are formed. Calcium and copper titanates, CaTiO3 and CuTiO3 interact to form CaCu3Ti4O12. Ca3Ti2O7 phase with pyrochlore structure is stable and prevent the formation of final product, CaCu3Ti4O12. A method for the synthesis of CaCu3Ti4O12 by solid-state reactions technique from previously synthesized CaTiO3 (at 1050 °С) and CuTiO3 (at 950 °С), taken in a molar ratio of 1:3, is proposed. This method give the possibility to avoid the appearance of an undesirable Ca3Ti2O7 phase with the pyrochlore structure and to reduce the content of free copper oxide to value less than 0.5 mol.%. In addition, instead of the copper oxide, which is usually used in solid-state reaction technique, the chemically more active form of the copper-containing reagent, CuCO3∙Cu(OН)2 were used. This reduce the synthesis time of the intermediate CuTiO3. The crystal structure, chemical composition, microstructure and electrophysical parameters of ceramics have been analyzed. The synthesized ceramics CaCu3Ti4O12 is cubic body-centered (space group Im-3) with the unit cell parameter a = 7.3932 Å, which agreed with the literature data. The calculated tolerance factor of CaCu3Ti4O12, t = 0.7626 is not sufficient for a stabilization of peroskite ABO3 structure; that is why the crystal structure of this compound contains 3 different cation sites: dodecahedral (Ca2+), octahedral (Ti4+), tetrahedral (Cu2+). At 1150 °C, the density of CaCu3Ti4O12 ceramic sintered has a maximum (90% of the theoretical density). At infra-low frequencies (10-3 Hz), the dielectric constant (e) reaches record values of 107, however, dielectric losses (tg d) up to 10 were observed. In the frequency range 10-3 - 105 Hz the value of ɛ exceeds 104; and at 105 Hz minimum of the dielectric losses (tg δ ~ 0.1) is observed. A comparative analysis of methods for the synthesis of CaCu3Ti4O12 shows that the synthesis conditions of material of the same chemical composition can be crucial in creating high dense ceramic with uniform grains, high dielectric constant and low dielectric losses in a wide frequency range.
PENGARUH KEPUASAN DAN KEPERCAYAAN TERHADAP LOYALITAS PELANGGAN PADA INDUSTRI KUE BAWANG BINA KARYA KECAMATAN RENGAT KABUPATEN INDRAGIRI HULU
Authors: Yulianda Airine 
Published: August 2019

Penelitian ini dilakukan pada Industri Kue Bawang Bina Karya Rengat. Industri ini memproduksi keripik bawang sebagai makanan khas kota Rengat. Perumusan masalah yang akan diteliti adalah apakah kepuasan dan kepercayaan secara simultan berpengaruh terhadap loyalitas pelanggan, apakah kepuasan secara parsial berpengaruh terhadap loyalitas pelanggan dan apakah kepercayaan secara parsial berpengaruh terhadap loyalitas pelanggan pada Industri Kue Bawang di Rengat. Penelitian ini dilakukan untuk melihat seberapa besar pengaruh kepuasan dan kepercayaan terhadap loyalitas pelanggan pada Industri Kue Bawang Bina Karya Kecamatan Rengat Kabupaten Indragiri Hulu.

Data yang dikumpulkan adalah data primer. Data primer adalah data yang dikumpulkan menggunakan penyebaran kuesioner atau data yang didapat dari konsumen. Metode yang digunakan untuk menganalisa data adalah dengan menggunkan metode kuantitatif yaitu dengan regresi linear berganda, uji t dan uji f.

Hasil regresi linear berganda diperoleh persamaan Y = 0,404 + 0,491X1 +0,451X2 artinya loyalitas pelanggan adalah sebesar 0,404 apabila X1(kepuasan) dan X2(kepercayaan) sama dengan 0(nol). b1 koefisien regresi kepuasan sebesar 0,491 artinya setiap peningkatan kepuasan(X1) sebesar 1 dan variabel kepercayaan konstan maka akan terjadi peningkatan loyalitas pelanggan sebesar 0,491. b2 koefisien regresi kepercayaan sebesar 0,451 artinya setiap peningkatan kepercayaan(X2) sebesar 1 dan variabel kepuasan konstan maka akan terjadi peningkatan loyalitas pelanggan sebesar 0,451. Nilai korelasi sebesar 0,879 artinya hubungan antara variabel independen dengan variabel dependen sangat kuat karena mendekati angka 1, untuk determinasi variabel X1 dan X2 memberikan sumbangan terhadap Y sebesar 77,3% dan sisanya dipengaruhi oleh variabel yang yang tidak diteliti. Hasil untuk uji Fadalah F hitung (136,037) > F tabel (3,11) maka Ho ditolak dan Ha diterima. Artinya variabel kepuasan dan kepercayaan secara bersama – sama memiliki pengaruh signifikan terhadap loyalitas pelanggan. Hasil uji t untuk kepuasan(X1) adalah t hitung (3,892) > dari spada t tabel (1,989) maka Ho ditolak dan Ha diterima, yang berarti kepuasan memiliki pengaruh yang signifikan terhadap loyalitas pelanggan. Untuk kepercayaan (X2) karena t hitung (5,880) > dari pada t tabel (1,989) maka Ho ditolak dan Ha diterima, yang berarti kepercayaan memiliki pengaruh yang signifikan terhadap loyalitas pelanggan.
ANALISIS TINGKAT KEPUASAN ORANGTUA TERHADAP TINGKAT LAYANAN PENDIDIKAN (Studi Kasus di Angel’s School Rengat - Kabupaten Indragiri Hulu)
Authors: Fransinatra Ziko 
Published: August 2019

Penelitian ini bertujuan untuk menganalisis pengaruh Tingkat Kepuasan Orang Tua Terhadap Tingkat Layanan Lembaga Angel’s School Rengat. Metode penelitian ini adalah kualitatif dan survey dengan teknik analisis regresi linear Sederhana. Populasi penelitian adalah orang tua murid dengan sampel 50 orang.
Hasil penelitian menunjukkan Berdasarkan hasil analisis statistik tentang pengaruh variabel bebas terhadap variabel terikat pada penelitian ini, maka dapat terbukti bahwa hasil analisis statistik telah membuktikan, bahwa tingkat kepuasan orang tua berpengaruh positif dan signifikan terhadap tingkat layanan Angel’s School, dimana nilai thitung lebih besar dibanding ttabel, yaitu 2.114> 1,990 dan signifikansinya 0,001 kecil dari nilai α/2 0,05.
Sesuai dengan dimensi/cakupan penelitian tentang variabel kepuasan pada Angel’s School telah terwujud namun masih perlu ditingkatkan. Hal ini didukung oleh pernyataan responden bahwa 78 % kepuasan orang tua mendukung tingkat layanan sedangkan 22 % belum terlaksana dan butuh peningkatan.
Saran untuk penelitian penelitian lanjutan melakukan penelitian tentang variabel-variabel Kompetensi SDM dan Fasilitas apakah dengan metode penelitian yang sama atau dengan metode penelitian lain kualitatif maupun kuantitatif.
Effectiveness of self-instructional information on knowledge of office ergonomics among computer users in educational institutions in North-Eastern Nigeria
Authors: Shokunbi Ganiyu Oluwaleke , George Gabriel 
Published: August 2019

Background: The use of computers has increased among adolescents, as have musculoskeletal symptoms. There is evidence that these symptoms can be reduced through ergonomic approaches via educationObjectives: The purpose of this study was to assess the effectiveness of self-instructional information on knowledge regarding office ergonomics among computer users. Methods: 170 computer users among the staffs of selected higher educational institutions in Nigeria participated in this study. The occupational Safety and Health Administration (OSHA) workstation checklist was used to assess the level of knowledge of office ergonomics. The work Safely with Visual Display Terminal (WSVDT) booklet was used to provide instructional information on office ergonomics. Both the OSHA checklist and WSVDT booklet were administered and collected by hand. Paired t-test and Kendall’s correlation coefficients were used for data analysis. Statistical significance was set at an alpha level of 0.05Results: The pre-information and post-information knowledge scores of office ergonomic were 22.78±6.61 and 31.05±2.82 respectively. Paired t test showed a significant difference in the pre information and post -information knowledge scores of the participants (t = 20.495, P value = 0.000). Kendall’s correlation coefficient value (r) of the association between changes in the level of knowledge of office computer ergonomic and age, level of education of computer users, levels of computer use; i.e., daily computer use, weekly computer use and total period of computer use, were -0.28, 0.34, 0.59, 0.24 and 0.07, respectively. Age did not show a statistically significant correlation with changes in the knowledge of office ergonomic (P > 0.05) whereas the level of educational qualifications and all levels of duration of computer use did show significant correlation (P < 0.05). Conclusion: Findings from this study showed that instructional information on computer office ergonomics increased the level of knowledge of office ergonomics among computer users in selected institutions of learning in Nigeria. It also showed that the level of education and duration of computer use increased with an increase in the changes in the level of knowledge of computer office ergonomics among computer users.
Potential of Carrageenans in Foods and Medical Applications
Authors: Noor Hafizh Muhammad 
Published: August 2019

Background: Carrageenans, the polysaccharides obtained by extraction of certain species of red seaweeds (Rhodophyceae), have been widely used in both food industry and medical applications because of their excellent physical functional properties that are used as gelling, thickening and stabilizing agent. Several studies showed biological properties of carrageenans such as antiviral, anticoagulant, antitumor, antioxidant, anti-inflammatory and immune-modulatory activity. Aims: This study is to bring a short overview of the potential of carrageenans in foods and medical applications based on their biological activities.Methods: This short overview used relevant works and articles examined that collected through several electronic database including PubMed, Science Direct, Springer Link and Google Scholars for the years 1991-2018 with full text in English.Results: This study is an alternative approach that is necessary in order to present the potential of carrageenans in foods and medical applications.The advantages of carrageenans as a food additive and pharmaceutical formulation lie on their high availability, low cost, and low induction of resistance. Conclusion: This review suggested that carrageenans are suitable to be applied in many kinds of food products as gelling and thickening agent with their antioxidant potency as well as medical applications such as pharmaceutical formulations in drug delivery and experimental medicine. However, more comprehensive studies on toxicity and side effect of carrageenans are necessary.
Tactile-kinesthetic stimulation to gain weight and reduce the length of stay care for premature baby at public hospitals of Semarang, Indonesia
Authors: Iskandar Freya Nazera , Suwondo Ari , Santoso Bedjo 
Published: August 2019

Background: Premature babies are susceptible to a variety of health problems in early of their lives, thus, management of premature care should be designed to optimize the growth and development, with no more cost extension. The management of premature care by non-pharmacological treatments becomes popular nowadays, and applied in the hospital unit care, including the Tactile-Kinesthetic Stimulation (TKS) and Kangaroo Mother Care (KMC).Aims: This study is to present the effect of Tactile-Kinesthetic Stimulation (TKS) on weight gain and reduction length of stay care for premature babies, and to compare the results with the standard Kangaroo Mother Care (KMC) given at the hospital care unit.Methods: The study used a quasi-experimental design with pretest-posttest with a control group. A total of 32 premature babies was equally divided to a control group given a standard KMC procedure and an intervention group receiving the TKS. Sampling was done using a consecutive sampling method where the low birth weight infants were selected from two public hospitals in Semarang of Indonesia, with consent from the parents. Data was then analyzed by a repeated measure ANOVA, general linear model and Mann-Whitney test to find the significant mean difference at p value less than 0.05.Results: The data shows that the babies’ weight significantly increased day by day only if the premature neonates received Tactile-Kinesthetic Stimulation, gained 148.75 gram only 3 days after the initial measurement. However, from this study we noted that the premature babies’ weight at the control group provided only with Kangaroo Mother Care slightly decreased at 35.69 gram at the third day of observation. In average, premature babies receiving TKS need only 3 days before return home, while if receiving the standard KMC the preterm babies required 5 days in the hospital care.Conclusion: Not only effective to gain the weight, giving Tactile-Kinesthetic Stimulation to the low birth weight baby shorter the length of stay in the hospital unit care. It suggests that the TKS intervention will provide good result in maintaining the weight of the low birth weight baby and will reduce the costs of staying in the hospital unit care. Keywords: Tactile-Kinesthetic Stimulation, Kangaroo Mother Care, Low birth weight, Length of stay care, Premature baby.