bluuebunny/crossref_metadata_2025_split huggingface dataset:
The Effect of Basis Set on Quantum Tunneling Probability with the Case of trans-HCOH Isomerization
Authors: Susanti E D , Junia S R , Fadilla R N , Supardi A 
Published: January 2020

Abstract
We investigate the effects of basis set in quantum tunneling probability in the case of trans-HCOH isomerization to H2CO. Based on Density Functional Theory (DFT) calculation with B3LYP as functional exchange-correlation and 6-31G(d, p) as basis set, Rizka et al. found that trans-HCOH molecule has half life for 2.5 hours. The result has 0.7 hour longer than experimental result done by Schreiner et al. In this study, we used five variations of basis set which are: STO-3G, 6-31G, 6-31G(d, p), 6-31+G(d, p), and LANL2DZ. We started to investigate the effects of basis set on the electronic structure and vibrational frequency of the molecules. Then, we investigated the effects of basis set on quantum tunneling probability in molecule. Based on quantum tunneling probabilities, we could calculate half-life of trans-HCOH isomerization to H2CO. We compare our results to the experimental result done by Schreiner et al. The results show that basis set increases the quantum tunneling probability of the isomerization.
Physical Characteristics of Erythropoetin Encapsulated into Alginate Polymer Using Aerosolization Technique
Authors: Melani Hariyadi Dewi , Rosita Noorma , Amalia Kamila 
Published: January 2020

Abstract
The aim of this research was to evaluate physical characteristics of erythropoietin encapsulated into alginate polymer using a microparticle technology called aerosolization technique at different polymer concentrations. Erythropoetin is a model of neuroprotectant drugs. The sodium alginate concentrations used were 1%, 2%, and 3% with 1M cross-linker CaCl2. The physical characteristics in terms of morphology, particle size, swelling index, yield, and structural integrity of erythropoietin-Ca alginate microspheres were determined. Microsphere evaluation included FT-IR, DTA, moisture content, morphology using SEM, particle size distribution using optical microscopy, determination of swelling index, and yield. SDS PAGE electrophoresis was also conducted to evaluate the molecular weight of erythropoietin before and after the microencapsulation process.
The resulting microspheres had spherical form, smooth surface, and the sizes below 5 μm. The determination of swelling index was performed using two methods, namely calculation of mass differentiation and size differentiation at 24 and 30 hours. Results of examination from swelling indices in F1, F2, F3 were 0.58, 1.25, 1.43 (at 24 hours) and 0.78, 1.78, 2.16 (at 30 hours), respectively, whereas resulted of swelling index of 0.50, 1.15, 1.32 (by size method at 24 hours), and 0.65, 1.80, 1.98 (at 30 hours). The result of yield microspheres of F1, F2, F3 were 75.55% ± 0, 350; 77, 84% ± 0, 290; and 86, 65% ± 0, 191. Statistical result showed that an increase of alginate concentration causes an increse in particle size, swelling indeks, and yield. From SDS PAGE profile, it was confirmed that erythropoietin maintains its structural integrity evidenced by the similar molecular weight before and after encapsulation process. This study has demonstrated the potential of erythropoietin-alginate microspheres that may be effective as a neuroprotectant drug.
Synthesis of Aluminium Nanoparticles Using Electrochemical Method
Authors: Anggraeni S D , Kurniawan F 
Published: January 2020

Abstract
Aluminium nanoparticles (Al NPs) have been synthesized using electrochemical method. The synthesis was conducted by electrolysis of aluminium metal in a sodium citrate solution as an electrolyte solution. Formation of Al NPs was investigated on the variation of potential (5-50 V), concentration of electrolyte solution (0.02-0.42 M), and electrolysis time (15-75 minutes). The obtained product was characterized by X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM), Energy Dispersive X-Ray (EDX), and UV-Vis Spectrophotometer. XRD pattern indicate that the obtained product was aluminium nanoparticles. The result show that the size of Al NPs were 56-63 nm with the Al compositions of 7.08%. The optimum condition was reached at 40 V with 0.18 M sodium citrate solution during 45 minutes electrolysis process. The plasmon band peak was found at 234 nm. In this condition Al Nps is more stable.
Synthesis of Hydroxyapatite Based on Nano Coral Using precipitation Method For Bone Substitution
Authors: Siswanto  , Hikmawati Dyah , Benecdita N , Nurmala Siti 
Published: January 2020

Abstract
The synthesis of hydroxyapatite based nano coral by precipitation method already has been done. This method is chosen because it does not need to use organic solvents, simple, cheap and effectively. The selection of coral as a base material because the material has a fairly high calcium content. Moreover, this element is a major component of bone and availability in Indonesia is abundant. By using 3D HEM (High Energy Milling) for 20 hours milling can be formed 64.93 nm coral powder. The treatment of calcination of CaCO3 at 900°C for 3 hours on this coral powder produced CaO. Dissolution of this material in aquades can be formed Ca (OH)2 and this study uses the concentration of the solution as research variables, namely (0.6, 0.85, 1.1, 1.35, 1.6) M. Hydroxyapatite can be formed by reacting calcium hydroxide solution Ca(OH)2 with phosphoric acid (H3PO4) in a stirrer and then precipitated. Observation of the precipitate formed the occurrence of hydroxyapatite and β-TCP (β-Tricalcium Phosphate) phases. The calcium hydroxide concentration that produces the most optimal hydroxyapatite is at a concentration of 0.85 M resulting in a hydroxyapatite phase of 95.3% and a β-tricalcium phosphate phase Ca3(PO4)2 of 4.7%. The ratio Ca/P in this concentration is 1, 66, shows that almost same with an ideal hydroxyapatite 1, 67, and this hydroxyapatite is a good candidate for bone substitution.
Numerical Simulation of Spear Motion as Game Items
Authors: Muhima R R , Mardi S , Hariadi M , Puspitasari I 
Published: January 2020

Abstract
Game development in 3D is mostly done by characters, items and the environment. Game items such as character weapons modeled in 3D will be the attraction of a game. In this paper, spear motion as a game items is modeled in 3D. Nonlinear Equations Six Degrees of Freedom (6 DOF) are used for mathematical models of spear motion. The parameters studied in the motion model are: geometry, mass and aerodynamics. Spear aerodynamic parameters were analyzed using the Datcom method. Numerical simulation of mathematical models of spear motion with variations in the initial velocity of the throw and the direction of the throw. From the results of numerical simulation, the maximum range R = 131.7 m at the initial velocity V0
= 40 m/s, the direction of throw (angle θ0
= 35 deg, angle φ0
= 10 deg, ψ0
= 0 deg). And the maximum height Hmax
= 12.18 m is achieved at the initial velocity V0
= 20 m/s, direction of throw (angle θ0
= 35 deg, angle φ0
= 40 deg, angle ψ0
= 0 deg).
Pronounced and unavoidable impacts of low-end global warming on northern high-latitude land ecosystems
Authors: Ito Akihiko , Reyer Christopher P O , Gädeke Anne , Ciais Philippe , Chang Jinfeng , Chen Min , François Louis , Forrest Matthew , Hickler Thomas , Ostberg Sebastian , Shi Hao , Thiery Wim , Tian Hanqin 
Published: January 2020

Abstract
Arctic ecosystems are particularly vulnerable to climate change because of Arctic amplification. Here, we assessed the climatic impacts of low-end, 1.5 °C, and 2.0 °C global temperature increases above pre-industrial levels, on the warming of terrestrial ecosystems in northern high latitudes (NHL, above 60 °N including pan-Arctic tundra and boreal forests) under the framework of the Inter-Sectoral Impact Model Intercomparison Project phase 2b protocol. We analyzed the simulated changes of net primary productivity, vegetation biomass, and soil carbon stocks of eight ecosystem models that were forced by the projections of four global climate models and two atmospheric greenhouse gas pathways (RCP2.6 and RCP6.0). Our results showed that considerable impacts on ecosystem carbon budgets, particularly primary productivity and vegetation biomass, are very likely to occur in the NHL areas. The models agreed on increases in primary productivity and biomass accumulation, despite considerable inter-model and inter-scenario differences in the magnitudes of the responses. The inter-model variability highlighted the inadequacies of the present models, which fail to consider important components such as permafrost and wildfire. The simulated impacts were attributable primarily to the rapid temperature increases in the NHL and the greater sensitivity of northern vegetation to warming, which contrasted with the less pronounced responses of soil carbon stocks. The simulated increases of vegetation biomass by 30–60 Pg C in this century have implications for climate policy such as the Paris Agreement. Comparison between the results at two warming levels showed the effectiveness of emission reductions in ameliorating the impacts and revealed unavoidable impacts for which adaptation options are urgently needed in the NHL ecosystems.
Anthropogenic land cover change impact on climate extremes during the 21st century
Authors: Sy Souleymane , Quesada Benjamin 
Published: January 2020

Abstract
Anthropogenic land cover change (LCC) can have significant impacts at regional and seasonal scales but also for extreme weather events to which socio-economical systems are vulnerable. However, the effects of LCC on extreme events remain either largely unexplored and/or without consensus following modelling over the historical period (often based on a single model), regional or idealized studies. Here, using simulations performed with five earth system models under common future global LCC scenarios (the RCP8.5 and RCP2.6 Representative Concentration Pathways) and analyzing 20 extreme weather indices, we find future LCC substantially modulates projected weather extremes. On average by the end of the 21st century, under RCP8.5, future LCC robustly lessens global projections of high rainfall extremes by 22% for heavy precipitation days (>10 mm) and by 16% for total precipitation amount of wet days (PRCPTOT). Accounting for LCC diminishes their regional projections by >50% (70%) in southern Africa (northeastern Brazil) but intensifies projected dry days in eastern Africa by 29%. LCC does not substantially affect projections of global and regional temperature extremes (<5%), but it can impact global rainfall extremes 2.5 times more than global mean rainfall projections. Under an RCP2.6 scenario, global LCC impacts are similar but of lesser magnitude, while at regional scale in Amazon or Asia, LCC enhances drought projections. We stress here that multi-coupled modelling frameworks incorporating all aspects of land use are needed for reliable projections of extreme events.
Quiver asymptotics:

N=1

free chiral ring
Authors: Ramgoolam S , Wilson Mark C , Zahabi A 
Published: January 2020

Abstract
The large N generating functions for the counting of chiral operators in

, four-dimensional quiver gauge theories have previously been obtained in terms of the weighted adjacency matrix of the quiver diagram. We introduce the methods of multi-variate asymptotic analysis to study this counting in the limit of large charges. We describe a Hagedorn phase transition associated with the asymptotics, which refines and generalizes known results on the 2-matrix harmonic oscillator. Explicit results are obtained for two infinite classes of quiver theories, namely the generalized clover quivers and affine

orbifold quivers.
Study on BCP and BCM for Urban and Building Resilience to Withstand Earthquakes in Japan
Authors: Hu Jichen , Tanaka Takehiro 
Published: January 2020

Abstract
The occurrence of the 2011 East Japan Earthquake prompted the country to accelerate the development of BCP/BCM-based communities aimed at establishing autonomous energy systems and implementing disaster management. This idea is also considered to be a comprehensive concept for addressing the effects of climate change. In this case, flexible urban planning proposals were made and targets, measures and assessment procedures were tried and established in various areas such as urban planning, energy, transportation, health and welfare. According to the results, the corresponding measures and the emergency early warning treatment plan after the disaster are proposed to achieve the purpose of risk assessment.
Experimental research of the temperature potential of ventilation emissions in apartment buildings
Authors: Gregory Vasilyev , Victor Gornov , Nikolay Timofeev , Alexander Dmitriev , Pavel Shapkin , Marina Kolesova 
Published: January 2020

Abstract
Authors of this article presents the results of experimental research of the temperature potential of ventilation emissions in apartment buildings in Moscow. Also this paper offers an analysis and synthesis of technological schemes and technical solutions for natural ventilation systems used in apartment buildings. The systems of natural ventilation of lower-cost multi-storey buildings have been analyzed. The influence of various factors on the parameters of operating modes of natural ventilation systems have been also analyzed. As a result of the analyses it has been found, that the operated apartment buildings largely do not ensure air exchange required according to sanitary regulations, which results in adverse effects for the health, efficiency and life expectancy of population.
Application of turbine generator in pipeline for transporting natural gas
Authors: Zhang Liang , Zheng Jiyu 
Published: January 2020

Abstract
Turbine generator is a kind of small power generation equipment widely used in drilling, military and other fields, but there is no practical application in pipeline for transporting natural gas at present. In this paper, the working principle and technical characteristics of turbine generator are expounded, indicating that the way of using the kinetic energy of natural gas transported in the pipeline to convert to mechanical energy to generate electricity has a good prospect in engineering application. Based on design theory of turbine blade and VB language programming, 3d blade model is established. CFD software is used to simulate the flow field of the blade, and the distribution of velocity and pressure in the single periodic flow path of stator and rotor is obtained, providing feasible technical means for testing turbine hydraulic performance in practical engineering.
Relationship between Time Lapse Microgravity Anomaly with Na and Cl Content for prediction of Sea Water Intrusion in Tourism Area Kota Lama Semarang Indonesia
Authors: Supriyadi  , Khumaedi S. , Sugiyanto  
Published: January 2020

Abstract
This research is motivated by changes in infrastructure that occur in the old city, the changes in question are the frequent occurrence of flooding in this region. The flooding that occurred was estimated to be caused by subsidence. In addition, subsidence that has other effects, for example seawater intrusion in the Old City, which is located close to the north coast of Java, is also relatively close to about 3 km. The purpose of this study was to find a relationship between seawater intrusion and micro-gravity anomalies between times. The methods carried out are as follows: (1) choose Gravimeter with micro precision. For this study using the Autograv CG5 type, (2) determining the location of the measurement point, which is not expected to experience physical damage due to natural or human behavior for a certain interval, (3) measuring gravity for two different periods in September 2017 and March 2018 at the same point, (4) processing data with initial corrections, namely tidal correction to reduce tidal effects, float correction, and correction of the dynamics of groundwater levels associated with rainfall, and (5) conduct chemical tests of water samples taken from residents’ wells at the Research site. The results showed that the negative time-weight gravity anomaly correlated with an average groundwater level decrease of 15,468 cm. This is in accordance with the fact that during this range rainfall trends tend to decline from September 2017 to March 2018. This decrease in ground water causes maximum subsidence and occurs in the south-southwest 2.3 cm. This zone experiences sea water intrusion which is characterized by the content of Na (60-100%) and Cl (100-160%).
Behaviour of 3D printed PLA and PLA-PHA in marine environments
Authors: Montalvão G R , Moshrefi-Torbati M , Hamilton A , Machado R , João A 
Published: January 2020

Abstract
The accumulation of marine debris in the oceans has been escalating. There is an urgent need to develop new technologies that efficiently record and transmit ocean data without contributing to ocean pollution. In this study, the behaviour of Polylactic Acid (PLA) and Polylactic Acid-Polyhydroxyalkanoate (PLA-PHA) in marine environments was analysed in order to assess biodegradability in marine applications. 3D Printed samples were submerged completely in seawater and cyclically in a salt spray chamber. Their change in mechanical properties was evaluated by conducting uniaxial tension tests after submersion periods of up to 45 days and failure regions were observed in microscope. Contrarily to PLA’s behaviour, PLA-PHA’s samples suffered embrittlement and registered losses in elongation at break of around 10-18%. The alignment of salt crystals and other impurities in the failure regions suggests that embrittlement could be related with environmental stress cracking resulting from the penetration of those impurities into the polymer. Such inclusions originate residual stresses which lead to a faster and more brittle failure. Embrittlement could also be related to an increase in crystallinity caused by chain scission of amorphous regions by means of chemical degradation. Further evaluation of changes in molecular weight should be conducted to confirm the latter.
Retraction: The Influence of Safety Practices on
Construction Labour Productivity (IOP Conf. Ser.: Mater. Sci.
Eng.
620 012075)
Authors: Setiani Yulia , Majid Muhd Zaimi Abd 
Published: January 2020

This paper was retracted by IOP Publishing on 27 January 2020, as it had already
been previously published elsewhere.
Retraction published: 27 January 2020
Making mix fruit and vegetable drink instant powder that is rich in iron as prevention of dismenore with composition variations and drying temperatures
Authors: Nashrullah N M , Isdes I M , Rahmadani F , Minah F N 
Published: January 2020

Abstract
Making a drink mix fruit and vegetable from the red spinach, red bean, guava and beet fruit can be a way to enhance iron content of their products, and will raise the value of favorite of the society towards it. This study aims to determine the right formula of the variation of composition fruit and vegetable and temperature levels drying against iron and find out acceptance to the society in powder fruit and vegetable drink mix. Methods used to making a drink mix fruit that is a Foam Mat Drying method. Based on an analysis of the iron, the best conditions exist to variation composition 40% of guava at temperature drying 60°C. The temperature drying affecting the iron and vitamin C in mixed fruit and vegetable. Based on the hedonic organoleptic test, mix fruit and vegetable can be well accpted by the society for its color from variations composition 40% of red bean (60°C), the aroma of 40% of guava (60°C), and the taste of 40% beet fruit (50°C). So it can be concluded that variations composition fruit that is produced with composition of the 40% of guava.
Heterogeneous biocatalyst: Polyurethane foam coating technique with co-immobilized lipase for bio-flavor production
Authors: Moentamaria D , Dewajani H , Chumaidi A , Nurmahdi H , Sinduwati C 
Published: January 2020

Abstract
Bio-flavor is produced from the esterification reaction including free fatty acids and citronellol. Free fatty acids (lauric C12) can be obtained from the hydrolysis of coconut oil substrate. Both of these reactions use heterogeneous polyurethane foam (PUF) matrix catalysts which immobilize the lipase enzyme. PUF is used as an immobilized matrix, because it has characteristics as open cell, rigid, high porosity, consists of of the ether-, carbamate-, amide-groups, so it has the ability to absorb water-oil. PUF has been modified its surface structure by co-immobilized lipase coating technique to make it more hydrophobic/oleofilic. Co immobilized consists of a mixture of gelatine, lechitin, polyethylene glycol (PEG), MgCl2. The aim of this research is to compare the immobilization technique of lipase Mucor miehei using different carriers, that are zeolite, alginate and polyurethane foam (PUF) to produce bio-flavor at mild condition. Each of that was through the mechanism of adsorption, entrapment and covalent binding process. The research was done in specific condition and all of the carriers has gone through the esterification process using different mole ratio of FFA and citronellol. Optimum result of bio-flavor conversion was obtained at the temperature of 40°C, highest thermal stability of 90% and the ability for reusage 4 times on PUF carrier. This results have proven to be cheaper on cost and environmentally friendly.
Optimization of biodiesel production from Chlorella sp through in-situ microwave-assisted acid-catalyzed trans-esterification
Authors: Bhuana D S , Qadariyah L , Panjaitan R , Mahfud M 
Published: January 2020

Abstract
Microalgae is one of the potential raw materials in producing the third generation biodiesel thanks to its high lipid contents and the fact that it requires relatively small space for cultivation. Microalgae in the form of Chlorella sp. was used as a raw material in this study due to its high oil content, i.e. up to 30% of the dry algae weight. The use of microwave irradiation in this process would accelerate the in-situ trans-esterification reaction by extracting microalgae lipids and simultaneously converting them into Methyl-Esters. This study aims to investigate the methyl ester production through the in-situ trans-esterification process by studying the effect of acid catalyst concentration (0.2 – 0.5 mol/L), microwave power (300 – 600 W) and reaction time (30 – 90 minutes). The experiment was carried out in a 500 ml flat bottom flask made of pyrex, under the influence of microwave irradiation in which homogeneous sulfuric acid (H2SO4) was introduced as a catalyst. The experiment was carried out in atmospheric pressure with the following operating variables: catalyst concentration, microwave power and reaction time, respectively. Prior to running the experiment, the response surface methodology using Box Behnken Design (3 factors and 2 levels) was conducted beforehand in order to minimize the number of runs. It is suggested from the analysis that the optimum conditions for the in-situ microwave-assisted trans-esterification of Chlorella sp. with sulfuric acid catalyst are as follows: microwave power (370 W), concentration of catalyst (0.2 mol/L), and trans-esterification time (82.7 min) with yield of 63.36 %. The predicted yield values generated from the response surface methodology with Box-Behnken design exhibit a high degree of confirmation with the actual yield from the experiment, suggesting that the optimization methodology carried out has made the experiment more effective and efficient by focusing only on certain specific parameters in order to get the best results, in terms of both quality and quantity.