bluuebunny/crossref_metadata_2025_split huggingface dataset:
Heat transfer intensification of Zirconia/water nanofluid
Authors: Shajahan Mohamed Iqbal , Raj Chockalingam Sundar , Arul Sambandan , Rathnakumar Palanisamy 
Published: May 2018

This paper investigated convective heat transfer and friction factor of ZrO2/H2O nanofluid through a circular pipe under laminar flow condition with constant heat flux. Nanofluid is prepared for 0.5, 0.75 and 1% volume concentrations with yttrium oxide surfactant. Nanofluid’s thermal conductivity and viscosity is measured by KD2 Pro thermal analyser and Brookfield viscometer respectively. Results showed that the thermal conductivity and viscosity increased with increase in particle volume concentration. These nanofluids are experimented in a forced convection system, first heat transfer characteristics of DI (Deionised) water under laminar flow in a copper tube measured, then three nanofluids are carried out the tests, results revealed that the enhanced Nusselt numbers of 21.09,28.05 and 35.73% at the 0.5, 0.75 and 1% volume concentrations, There is no excess penalty in pumping power and results showed less variations in friction factor for nanofluids comparatively with the base fluid DIWater.
Synthesis, Spectral Characterization and Antibacterial Investigation of Ni(II) Coordination Complexes of Macrocyclic Schiff base ligands Derived from 4-Aminoantipyrine
Authors: Lincoln Abraham , Boinapalli Srinath , Kumar A. Anil 
Published: May 2018

A series of Ni(II) complexes (NiL1-NiL5) have been synthesized from macrocyclic Schiff base ligands (L1-L5) were obtained from condensation of 4-aminoantipyrine derivative (L) with different diamines and hydrazides. All these compounds were well characterized by elemental, spectral analysis(mass, IR, 1H-NMR, electronic), magnetic suseceptibility, molar conductance and thermal studies. Macrocyclic Schiff bases are tetradentate with N4 donor system around the metal ion.Octahedral geometry have been assigned for all complexes. All ligands and complexes were examined for antibacterial activity and found that complexes were more potent when compared to ligands.
Computing the Omega polynomial of an infinite family of the linear parallelogram P(n,m)
Authors: Farahani Mohammad Reza 
Published: May 2018

Let G=(V,E) be a molecular graph, where V(G) is a non-empty set of vertices and E(G) is a set of edges. The Omega polynomial Ω(G,x) was introduced by Diudea in 2006 and this defined as where m(G,c) the number of qoc strips of length c. In this paper, we compute the omega polynomial of an infinite family of the linear parallelogram P(n,n) of benzenoid graph.
Kinetics and mechanism of sol-gel transformation between some trivalent- and tetravalent-metal ions and Sodium alginate Anionic polyelectrolyte with formation of coordination Biopolymeric structure polymembranes Hydrogels of Capillary Structures Ex
Authors: Zaafarany Ishaq Abdullah 
Published: May 2018

Abstract The kinetics of sol-gel transformation between A13+, La 3+ and Th4+ metal ion electrolytes and sodium alginate sol have been studied complexometrically at various temperatures. In the presence of a large excess of sodium alginate sol concentration over that of metal ion electrolyte, the pseudo first–order plots of exchange showed sigmoidal curves with two distinct stages. The initial part was relatively fast and curved significantly at early times, followed by a slow decrease in the rates of exchange over longer time periods. The rate constants of gelation showed second-order overall kinetics which was first order in the concentration of both reactants. The thermodynamic parameters have been evaluated and tentative gelation mechanisms consistent with the kinetic results of gelation are suggested. The stability of these ionotropic metal-alginate complexes has been discussed in terms of the coordination geometry and strength of chelated bonds.
Steric and Polar Factors Affecting Heteroring Opening of 2-[2-carboxy-3,4,5,6-tetrachloro]phenyl-4H-3,1-Benzoxazin-4-one by Nitrogen and Carbon Nucleophiles
Authors: Morsy Jehan Mahmoud , El-Hashash Maher Abdel Aziz 
Published: May 2018

The behavior of 2-[2-carboxy-3,4,5,6-tetrachloro]phenyl-4H-3,1-Benzoxazin-4- one towards Nitrogen nucleophiles and Carbon nucleophiles under Friedel–Crafts' reaction conditions has been investigated and steric versus polar factors affecting ring opening has been studied.
Some Polysorbate Compounds as Corrosion Inhibitors for Carbon Steel in Hydrochloric Acid
Authors: Sobhi Mohamed , Abdallah M. , Hfaez E. 
Published: May 2018

Some commercial non-ionic surfactants polysorbate, namely, polysorbate 80, polysorbate 40 and polysorbate 20, were tested as inhibitors for corrosion of C-steel in 2.0M HCl solution using weight loss, potentiodynamic polarization and electrochemical impedance spectroscopy techniques. It was found that all the three used compounds act as inhibitors for acid corrosion of C-steel. The inhibition efficiencies obtained by the three techniques were almost the same, and increase with increasing the hydrocarbon chain length and the surfactant concentration. The polarization studies show that these compounds act as mixed inhibitors. The inhibition action of these surfactants can be explained by their ability to adsorb on the metal surface making a barrier to mass and charge transfer. It was found that the adsorption of these surfactants follows Langmuir adsorption isotherm. The negative values of adsorption free energy indicating that the adsorption process is spontaneous and increases, for different surfactants, in the same direction as inhibition efficiency.
Kinetic and Conventional Spectrophotometric Determination of Bumadizone in its Tablets via Oxidative Coupling with 3-Methyl-2-Benzothiazolinone Hydrazone
Authors: Walash Mohamed , Belal Fathalla , Tolba Manar , Halawa Mohamed 
Published: May 2018

Two simple, sensitive and accurate spectrophotometric methods have been developed for the determination of bumadizone in bulk drug and its tablets. Both methods based on the oxidative coupling reaction with 3-methyl-2-benzothiazolinone hydrazone hydrochloride (MBTH) and measuring the absorbance of the developed colors by direct or kinetic spectrophotometric method. Upon treatment of a mixture of the chromogenic reagent and drug with cerium (IV) ammonium sulfate (method I) or ferric chloride (method I), a red or violet color was developed immediately or after 30 minutes measurable at 557 nm for method I or II, respectively. The absorbance-concentration plots were rectilinear over the ranges of 1-10 μg/mL (r = 0.9999) for method I and 2-16 μg/mL (r = 0.9998) for method II. The detection limits were 0.15 and 0.27 μg/mL & the quantitation limits were 0.46 and 0.84 μg/mL for methods I and II, respectively. Different experimental parameters affecting the development and stability of the reactions products were studied and optimized. The proposed methods were applied successfully to the determination of bumadizone in its tablets, and the results obtained were in good agreement with those obtained using a comparison method.
Growth of Ag-Nanoparticles: Shape-Directing Role of Silver Ions and Stabilizer in Aqueous Solutions
Authors: Zaheer Zoya , Rafiuddin Rafiuddin 
Published: May 2018

Silver nanoparticles were synthesized using Tulsi leaves extract as reducing as well as a capping agent to reduce the steps and parameters involved in the synthesis. The morphology, stability and optical properties of Ag-nanoparticles depend on reactants and stabilizer, cetyltrimethylammonium bromide (CTAB) concentrations. The silver nanoparticles were characterized by UV-visible spectrophotometer, and transmission electron microscope (TEM). Spherical morphology of the silver nanoparticles with an average diameter of 25 nm. Morphology changed markedly from spherical aggregated to highly polydispersed in presence of CTAB.
Spectroscopic Study of some Schiff Bases Derived from Dibenzoylmethane
Authors: A. Saeed Bahjat , Al-Masoudi Wasfi A. 
Published: May 2018

A series of Schiff bases 7-11 derived from dibenzoylmethane have been prepared. The UV, IR, 1H NMR and mass spectra revealed theses compounds were existed mainly as the keto-enamine tautomer in the solution. The absorption bands which appeared in the range λmax = 376-406 nm were assigned to the electronic transitions which arised from the central hydrogen bonded chelated unsaturated ring system in this tautomer. The appearance of the broad singlet near d = 13 ppm due to the N-H proton and a singlet near d = 6 ppm due to the –C=C-H proton inaddition to benzoyl fragment ion signal m/z =105 in the mass spectra supported the above suggested products.
Green synthesis of Ag nanoparticles using aqueous extract of Kaempferia galanga Linn. (Zingiberaceae) rhizomes
Authors: Devi Asem Satyavama , Laitonjam Warjeet S 
Published: May 2018

Green synthesis of noble metal nanoparticles (NPs) is a vast developing area of research. In the present study, silver nanoparticles (Ag-NPs) were rapidly synthesized by treating silver ions through a simple and green synthetic route using water extract of the rhizomes of Kaempferia galanga Linn.(KG), which acted simultaneously as a reductant and stabilizer. The reaction process was monitored using ultraviolet–visible (UV-Vis) spectroscopy. The EPR spectra of AgKG NPs was found to be confined in a single line which showed the presence of an unpaired electron indicating of Ag in neutral state at room temperature. The size and morphology of AgNPs recorded by Scanning electron microscopy (SEM) were further confirmed by transmission electron microscopy (TEM) and selected area electron diffraction (SAED). The formation of AgNPs is evidenced by the appearance of signatory brown colour of the solution. FT-IR spectrum indicates the presence of different functional groups in capping the nanoparticles with K. galanga. Average size range estimated from our studies is 2 to 4 nm. It consists of a spherical like particles.
Thermal analysis, X-ray diffraction, spectroscopy studies and magnetic properties of the new compound Tl2HAsO4.Te(OH)6
Authors: Bechibani I. , Litaiem H. , Granda S. Garcia , Dammak M. , Ktari L. 
Published: May 2018

The Tl2HAsO4.Te(OH)6 (TlAsTe) compound crystallizes in the triclinic system P1 with unit cell parameters: a= 7.100(10) Å, b= 7.281(13) Å, c= 8.383(11) Å, α= 76.91(1)°, β= 87.16(1)°, γ= 66.96(2)°, Z= 2 and V= 388.19(1) Å3. This new structure can be described as a lamellar one with the atomic arrangement being built by planes of Te(OH)6 octahedra alterning with planes of arsenate tetrahedra. Raman and infrared spectra recorded at room temperature confirm the presence of As and Te groups and characterize the hydrogen bonds present in the crystal lattice. Differential scanning calorimerty shows the presence of three-phase transitions at 396 K, 408 K and 430 K present in the title compound. Typical thermal analyses, such as differential thermal analysis and thermogravimetry show that the decomposition of this material starts at about T= 445 K. Magnetization curve of Tl2HAsO4·Te(OH)6 substance have revealed a diamagnetic response overall temperature range studied.
Phase Transition and Electrical Properties in Cs2SeO4.Te(OH)6
Authors: H. Litaiem , S. Garcia-Granda , M. Dammak , T. Mhiri 
Published: May 2018

Dielectric investigations in the temperature and frequency 300- 600 K and 0,1KHz–13MHz, respectively, show that cesium selenate tellurate Cs2SeO4.Te(OH)6 (CsSeTe) exhibits two phase transitions at 490 and 525 K. The a.c. complex impedance measurements performed on CsSeTe material show an important level of conductivity at high temperature, attributed to the motion of H+ proton. This behavior is in agreement with the presence of the super- protonic phase transition in CsSeTe compound at 525K. This assignment was confirmed by the analysis of the M"/M"max spectra. The temperature dependences of ε΄r and tanδ indicate that the anomaly at 490K is attributed to a ferroelectric-paraelectric phase transition. Thermal analysis at high temperature, DSC, DTA, TG, Ms/z= 18 and Ms/z= 32 confirm the presence of the two transitions already cited, the temperature and the nature of the decomposition.
Synthesis and Crystal Structure of 3-3’-Diaminomethyldipropylammonium Hexachlorobismuthate (III)
Authors: Baklouti Yosra , Koumina Abdelaziz , Fliyou Mohamed , Zouari Fatma 
Published: May 2018

Synthesis and crystal structure of 3-3’-diamino-N-methyldipropylammonuim hexachlorobismuthate (III) are reported. The compound crystallizes in the triclinic system with space group P1. The unit cell dimensions are: a = 7.5580(5), b =7.8710(6), c = 8.3709(7) Å with Z=1. The crystal is built up of separated [BiCl6]3- octahedral anions and 3-3’-diamino-N- methyldipropylammonium cations. The organic layers are arranged in sandwich between the anionic ones. The crystal packing is governed by means of the ionic N–H···Cl hydrogen bonds, forming a three dimensional network.
Synthesis, crystal structure and spectroscopic characterization of a new organic bismuthate (III) [C9H28N4][Bi2Cl10].H2O
Authors: Aloui Z. , Abid S. , Jeanneau E. , Rzaigui M. , Ben Nasr C. 
Published: May 2018

The chemical preparation, crystal structure and spectroscopic characterization of [C9H28N4][Bi2Cl10].H2O have been reported. This compound crystallizes in the monoclinic system in space group P21/c and cell parameters a = 12.2385 (6), b = 17.3062 (7), c = 13.0772 (6) Å, β = 104.475 (5)°, Z = 4 and V = 2681.9 (2) Å3. Its crystal structure has been determined and refined to R = 0.049, using 5848 independent reflections. The atomic arrangement can be described by an alternation of organic and inorganic layers. The inorganic layer built up of [Bi2Cl10]4– bioctahedra arranged in sandwich between the organic layer. The organic groups are interconnected by the water molecules through N-H…O(W) hydrogen bonds to form infinite zig-zag chains spreading along the b-axis. These Chains are themselves interconnected by means of the N–H…Cl hydrogen bonds originating from [Bi2Cl10]4– anions, to form a three-dimensional network. Intermolecular Cl…Cl interactions between adjacent dimeric [Bi2Cl10]4– anions have been observed. The compound was also characterized by FT-IR and Raman spectrscopies.
MAKNA SIMBOLIK TARI PENTUL MELIKAN DI TEMPURAN PARON NGAWI
Authors: Karimah Harmin Etikasari , Hanif Muhammad 
Published: May 2018

<p>Penelitian ini bertujuan untuk menganalisis dan mendeskripsikan makna simbolik Tari Pentul Melikan di Tempuran Paron Ngawi. Penelitian ini menggunakan pendekatan kualitatif deskriptif. Sumber data yang digunakan berupa sumber data primer dan sekunder. Teknik pengumpulan datanya menggunakan wawancara, observasi, dan dokumentasi. Validasi data menggunakan triangulasi sumber, dan dianalisis dengan kualitatif model interaktif. Hasil penelitian menggambarkan bahwa Tari Pentul Melikan memiliki makna yang dalam. Hal tersebut terlihat dari gerakannya yaitu: (1) gerakan rangkaian tangan maknanya manusia harus saling membantu satu sama lain, (2) jari mengembang ke hidung maknya setiap perbuatan manusia harus tetap sesuai dengan ajaran dari Tuhan, (3) gerak tangan yang menengadah ke atas sambil mengucapkan kata “ maju bung” maknanya ajakan untuk semua agar tetap bersemangat untuk maju, (4) gerak tangan siku- siku kemudian serong ke kiri sambil mengucapkan kata “selalu” maknanya kejadian di dunia ini selalu berubah, (5) gerakan jari telunjuk mengacung maknanya Tuhan itu satu, bumi itu satu dan terus berputar, (6) jari jempol mengacung sambil mengucapkan “sudah jadi“ maknanya manusia harus dapat mengendalikan diri sendiri dari hawa nafsu, (7) gerakan tangan terbuka ke atas sambil mengucapkan kata “aku suka” maknanya kegembiraan seseorang karena telah berhasil mencapai sesuatu yang telah menjadi tujuan. </p>
Suitability of forms of preparing seeds of Dalbergia miscolobium Benth for exposure to the tetrazolium test / Adequação das formas de preparação de sementes de Dalbergia miscolobium Benth para exposição ao teste de tetrazolium
Authors: Matos Juliana Martins de Mesquita , Martins Rosana De Carvalho Cristo , Bellotto Valéria Regina , Rocha Lilian Gomes da Silva , Barbosa Eloiza Aparecida , Sampaio Samara Souza 
Published: May 2018

Dalbergia miscolobium or Jacarandá do Cerrado is a species of legume in the Fabaceae family. It occurs in the sensu stricto Cerrado and in the dystrophic cerradão. It shows potential for landscaping and for recovering damaged areas. It is an endangered species and therefore is protected by the law that prevents cut in areas of the Federal District (Decree No. 14.783/93). The purpose of this study was to determine the best procedure to prepare seeds of Dalbergia miscolobium to assess viability in the tetrazolium test. We carried out the following treatments: i) hydration on filter paper at 25 ° C, ii) hydration on filter paper at 25 ° C followed by a cut in the tegument and iii) hydration on filter paper at 25 ° C followed bya complete removal of the tegument. The results were analyzed using analysis of variance and the Tukey range test. The analyzes showed that the best procedure to prepare seeds of Dalbergia miscolobium is the treatment in which there is a hydration followed by the complete removal of the integument. Where 78% of the seeds showed uniform staining, indicating that the seeds analyzed are of good quality. The other treatments, hydration and hydration followed by cutting, showed respectively 35% and 41% of viable seeds.
RESUMO
A Dalbergia miscolobium ou Jacarandá do Cerrado é uma espécie de leguminosa da família Fabaceae. Ocorre no sentido stricto Cerrado e no cerradão distrófico. Possui potencial para paisagismo e para recuperar áreas degradadas. É uma espécie ameaçada de extinção e, portanto, está protegida pela lei que previne o corte em áreas do Distrito Federal (Decreto 14.783 / 93). O objetivo deste estudo foi determinar o melhor procedimento de prepararação das sementes de Dalbergia miscolobium para serem submetidas à análise de viabilidade pelo teste de tetrazólio. Foram realizados os seguintes tratamentos: i) hidratação em papel de filtro a 25 ° C, ii) hidratação em papel de filtro a 25 ° C seguida de um corte no tegumento e iii) hidratação em papel de filtro a 25 ° C seguido de remoção completa do tegumento. Os resultados foram analisados utilizando-se a análise de variância e o teste de médias de Tukey. As análises mostraram que o melhor procedimento para preparar sementes de Dalbergia miscolobium é o tratamento em que há uma hidratação seguida pela remoção completa do tegumento, onde 78% das sementes apresentaram coloração uniforme, indicando que as sementes analisadas são de boa qualidade. Os demais tratamentos, hidratação e hidratação seguida de corte, mostraram respectivamente 35% e 41% de sementes viáveis.
PENGARUH JARAK DAN POLA PREFABRICATED VERTICAL DRAIN (PVD) PADA PERBAIKAN TANAH LEMPUNG LUNAK = EFFECT OF DISTANCE AND PATTERN OF PREFABRICATED VERTICAL DRAIN FOR IMPROVEMENT OF SOFT CLAY SOIL
Authors: Aspar Wimpie Agoeng Noegroho , Fitriani Eka Nur 
Published: May 2018

Abstract
If a structure for reasons of technical, economic, social, or startegic is to be builtÂ on a soft ground, then there are usually two problems to be solved, namely theÂ low geotechnical bearing capacity and large soil deformation with sometimesÂ differential settlement. Pre-compression is a foundation soil compression processÂ with the provision of temporary loading (preloading) before actually constructing aÂ building. Pre-fabricated vertical drain is a synthetic drainage system installedÂ vertically inside soft soil layers. Soil condition at the project activity is a relativelyÂ very soft clay soil with relatively high coefficient of consolidation resulting in veryÂ long period of consolidation process. Therefore, it is needed advance soilÂ improvement by prealoding of pre-fabricated vertical drain. Spacings of installedÂ PVD vary, those are 50 cm, 100 cm, 150 cm, and 200 cm with a pattern ofÂ triangles and rectangles. Based on the analytical calculation, it is resulted thatÂ optimum PVD distance to achieve 90% consolidation is 150 cm with a triangularÂ pattern. The time of consolidation was achieved within four months.
Â
Abstrak
Ketika suatu struktur karena alasan-alasan teknis, ekonomi, sosial, atau strategisÂ terpaksa didirikan di atas tanah lunak, maka biasanya ada dua masalah geoteknikÂ yang harus dipecahkan yaitu daya dukung yang rendah dan penurunan sertaÂ beda penurunan yang besar. Prakompresi adalah suatu proses pemampatanÂ tanah pondasi dengan jalan pemberian pembebanan sementaraÂ (prabeban/preloading) sebelum konstruksi yang sesungguhnya didirikan. PrefabricatedÂ vertical drain (PVD) adalah sistem drainase buatan yang dipasangÂ vertikal di dalam lapisan tanah lunak. Kondisi tanah di lokasi kegiatan relatifÂ sangat lunak dengan koefisien konsolidasi relatif sangat tinggi mengakibatkanÂ proses konsolidasi berjalan relatif sangat lama. Untuk itu diperlukan perbaikanÂ tanah terlebih dahulu dengan prealoading menggunakan PVD. Jarak spasi antarÂ PVD yang dipasang bervaiasi yaitu 50 cm, 100 cm, 150 cm, dan 200 cm denganÂ pola konfigurasi segitiga dan segiempat. Berdasarkan hasil perhitungan secaraÂ analitis didapatkan jarak optimum PVD untuk mencapai konsolidasi 90% adalahÂ 150 cm dengan pola segitiga dengan proses konsolidasi dicapai selama waktuÂ penurunan 4 bulan.
PENGEMBANGAN PENGECORAN BERBAHAN BAKU PADUAN MANGANESE BRONZE UNTUK PROPELLER KAPAL YANG BERBASIS BAHAN SCRAP = CASTING DEVELOPMENT OF MANGANESE BRONZE ALLOY FOR SHIP PROPELLER BASED ON SCRAP MATERIAL
Authors: Iwan Setyadi  
Published: May 2018

Many attempts were made to improve the quality of ship components, in particular the ship's propeller made through little-midle industries of casting (IKM) in order to reduce dependence on imports and in order to increase local content for the national ship industries. One of the efforts is to design the material balance of manganese bronze alloy to be applied on a ship's propeller foundry by using scrap materials. In this research, the variable is the percentage level of manganese in the alloy. Achievement of optimal research results occurred in 3.27% Mn content, which obtained an increase in hardness into BHN 180.4, up 11.9% from the initial conditions with Mn content of 0.42%. While the grain size reached 130.78 Î¼m, or 30.6% less than the current content of 0.42% Mn.
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ABSTRAK
Banyak upaya dilakukan untuk meningkatkan kualitas komponen kapal, khususnya baling-baling kapal yang dibuat melalui IKM pengecoran guna mengurangi ketergantungan impor dan dalam upaya peningkatan TKDN untuk industri kapal nasional. Salah satu upaya yang dilakukan adalah merancangneraca bahan paduan manganese bronze untuk diaplikasikan pada pengecoran baling-baling kapal dengan memanfaatkan bahan scrap. Dalam penelitian ini yang diatur adalah kadar prosentasi mangan dalam paduan. Pencapaian hasil penelitian yang optimal terjadi pada kandungan 3,27% Mn, dimana diperoleh peningkatan kekerasan menjadi 180,4 BHN atau naik 11,9 % dari kondisi awal dengan kandungan Mn 0,42%. Sedangkan ukuran butirnya mencapai 130,78 Î¼m, atau lebih kecil 30,6 % dibanding saat kandungan 0,42% Mn.
Faktor yang Mempengaruhi Kepuasan Pengguna Layanan pada Unit Pelayanan Disdukcapil Kota Bogor
Authors: Afif Nurullah Sururi , Munandar Jono M , Sarma Ma'mun 
Published: May 2018

Berdasarkan data BPS Kota Bogor tahun 2014, Kota Bogor mempunyai populasi yang terus meningkat dari tahun ke tahun. Salah satu administrasi kependudukan yang banyak dibutuhkan adalah KTP, hal ini merupakan bagian yang penting dimiliki serta merupakan kewajiban bagi setiap masyarakatusia tertentu untuk memilikinya. Pelayanan yang diberikan diharapkan dapat memenuhi kebutuhan pengguna layanan sehingga dapat meningkatkan kepuasan pengguna layanan. Pengambilan sample dalam penelitian ini adalah sebanyak 100 responden. Pengolahan data dalam penelitian ini menggunakan Structural Equation Modeling (SEM) dengan Partial least Square. Pengguna layanan didominasi oleh remaja antara usia 17 -20 tahun yaitu sebesar 50%. Hasil analisis menunjukan bahwa physical environment quality, harga (price) berpengaruh terhadap kepuasan pengguna layanan, sedangkan interaction Quality, Outcome Quality tidak berpengaruh terhadap kepuasan penggunalayanan.