bluuebunny/crossref_metadata_2025_split huggingface dataset:
Determination of the tricritical point, H–T phase diagram and exchange interactions in the antiferromagnet MnTa2O6
Authors: R Maruthi , Seehra Mohindar S , Ghosh Sayandeep , Medwal Rohit , Rawat Rajdeep S , Weise Bruno , Choi Eun Sang , Thota Subhash 
Published: January 2022

Abstract
Using the analysis of the temperature and magnetic field dependence of the magnetization (M) measured in the temperature range of 1.5 K to 400 K in magnetic fields up to 250 kOe, the magnetic field-temperature (H–T) phase diagram, tricritical point and exchange constants of the antiferromagnetic MnTa2O6 are determined in this work. X-ray diffraction/Rietveld refinement and x-ray photoelectron spectroscopy of the polycrystalline MnTa2O6 sample verified its phase purity. Temperature dependence of the magnetic susceptibility χ (=M/H) yields the Néel temperature T
N = 5.97 K determined from the peak in the computed ∂(χT)/∂T vs T plot, in agreement with the T
N = 6.00 K determined from the peak in the C
P vs T data. The experimental data of C
P vs T near T
N is fitted to C
P = A|T − T
N|−α
yielding the critical exponent α = 0.10(0.13) for T > T
N (T < T
N). The χ vs T data for T > 25 K fits well with the modified Curie–Weiss law: χ = χ
0 + C/(T − θ) with χ
0 = −2.12 × 10−4 emu mol−1 Oe−1 yielding θ = −24 K, and C = 4.44 emu K mol−1 Oe−1, the later giving magnetic moment μ = 5.96 μ
B per Mn2+ ion. This yields the effective spin S = 5/2 and g = 2.015 for Mn2+, in agreement with g = 2.0155 measured using electron spin resonance spectroscopy. Using the magnitudes of θ and T
N and molecular field theory, the antiferromagnetic exchange constants J
0/k
B = −1.5 ± 0.2 K and J
⊥/k
B = −0.85 ± 0.05 K for Mn2+ ions along the chain c-axis and perpendicular to the c-axis respectively are determined. The χ vs T data when compared to the prediction of a Heisenberg linear chain model provides semiquantitative agreement with the observed variation. The H–T phase diagram is mapped using the M–H isotherms and M–T data at different H yielding the tricritical point T
TP (H, T) = (17.0 kOe, 5.69 K) separating the paramagnetic, antiferromagnetic, and spin-flop phases. At 1.5 K, the experimental magnitudes of the exchange field H
E = 206.4 kOe and spin-flop field H
SF = 23.5 kOe yield the anisotropy field H
A = 1.34 kOe. These results for MnTa2O6 are compared with those reported recently in the isostructural MnNb2O6.
High-performance transparent conductive film by using ultra-thin metal grids
Authors: Yin Zhiqin , Liu Qingquan , Cui Zhuangzhuang , Xuan Zhiyi , Xie Maobing , Yao Bimu , Wang Shaowei 
Published: January 2022

Abstract
Transparent conductive films (TCFs) are indispensable for many optoelectronic devices. Films with high transmittance and low sheet resistance at low cost are ideal for people to pursue. In this paper, ultra-thin Au grid TCFs with thickness less than 0.32 μm are developed and fabricated by ultraviolet lithography. Nanoscale thick metal grid and simple experimental steps can greatly reduce their cost. The influence of grid shape (square, hexagon, ring), thickness and duty ratio on the transmittance and sheet resistance has been investigated systematically. The TCF with square shape Au grid has excellent properties with transmittance of 96.9%, sheet resistance of 11.5 Ω sq−1, and corresponding figure of merit of 1016. It is a good transparent heater with heating speed 100% faster and heating temperature 3.3% higher than indium tin oxide. It can also be fabricated on flexible substrates and exhibit good mechanical property, which have wide practical applications.
Strong coupling in thermoelectric nanojunctions: a reaction coordinate framework
Authors: McConnell Conor , Nazir Ahsan 
Published: January 2022

Abstract
We study a model of a thermoelectric nanojunction driven by vibrationally-assisted tunnelling. We apply the reaction coordinate formalism to derive a master equation governing its thermoelectric performance beyond the weak electron-vibrational coupling limit. Employing full counting statistics we calculate the current flow, thermopower, associated noise, and efficiency without resorting to the weak vibrational coupling approximation. We demonstrate intricacies of the power-efficiency-precision trade-off at strong coupling, showing that the three cannot be maximised simultaneously in our model. Finally, we emphasise the importance of capturing non-additivity when considering strong coupling and multiple environments, demonstrating that an additive treatment of the environments can violate the upper bound on thermoelectric efficiency imposed by Carnot.
Phononic manipulation of antiferromagnetic domains in NiO
Authors: Stremoukhov Pavel , Carl S Davies , Safin Ansar , Nikitov Sergey , Kirilyuk Andrei 
Published: January 2022

Abstract
The interaction between the crystal lattice and spins appears to be a very efficient mechanism for non-thermal manipulation of magnetic order. A particularly intriguing question is whether lattice vibrations can also be used to control or even switch domains in collinear antiferromagnets, where all other mechanisms fail. To answer this question, here we study the magnetic effects induced by tunable and narrow-band infrared optical pulses in single crystals of antiferromagnetic nickel oxide. Our measurements reveal that a resonant excitation in the vicinity of the frequency of longitudinal optical phonons leads to the displacement of antiferromagnetic domains in NiO, potentially revealing a promising method to manipulate antiferromagnetic order.
New cross section measurements on tungsten isotopes around 14 MeV neutrons and their excitation functions *
Authors: Li Yong , Zhou Fengqun , Hao Yajuan , Ma Xiaoqiang , Ji Pengfei , Zhang Xiaopeng , Yuan Shuqing 
Published: January 2022

Abstract
New cross sections of the 183W(n,α)180mHf, 186W(n,d*)185Ta, 182W(n,p)182Ta, 184W(n,p)184Ta, 182W(n,2n)181W, 184W(n,α)181Hf, and 186W(n,α)183Hf reactions were measured in the neutron energy range of 13.5-14.8 MeV via the activation technique to improve the database and resolve discrepancies. Monoenergetic neutrons in this energy range were produced via the T(d,n)4He reaction on a solid Ti-T target. The activities of the irradiated monitor foils and samples were measured using a well-calibrated high-resolution HPGe detector. Theoretical calculations of the excitation functions of the seven nuclear reactions mentioned above in the neutron energies from the threshold to 20 MeV were performed using the nuclear theoretical model program TALYS-1.9 to aid new evaluations of cross sections on tungsten isotopes. The experimental data obtained were analyzed and compared with that of previous experiments conducted by other researchers, and with the evaluated data available in the five major evaluated nuclear data libraries of IAEA (namely ENDF/B-VIII.0 or ENDF/B-VII.0, JEFF-3.3, JENDL-4.0u+, CENDL-3.2, and BROND-3.1 or ROSFOND-2010), and the theoretical values acquired using TALYS-1.9 nuclear-reaction modeling tools. The new cross section measurements agree with those of some recent experiments and theoretical excitation curves at the corresponding energies. The consistency of the theoretical excitation curves based on TALYS-1.9 with these experimental data is better than that of the evaluated curves available in the five major nuclear data libraries of IAEA.
V0644 Ser: An Active Ultrashort Period Contact Binary Star
Authors: Xu Hu-Shan , Zhu Li-Ying , Thawicharat Sarotsakulchai , Boonrucksar Soonthornthum 
Published: January 2022

Abstract
The photometric solutions of the ultrashort period close binary V0644 Ser based on our new complete BVRI light curves are derived by the Wilson–Devininney code. The results show that V0644 Ser is a W-type shallow contact binary, and the third light was found in the R and I bands. Compared with the light curves in 2011, the amplitude variation of the secondary maximum can be explained by the temperature change from hot to cold in the local region of the star surface caused by magnetic activity or convective instability. Combined with the Gaia parallax, the absolute parameters of this system are obtained: M
1 = 0.29(4) M
⊙, M
2 = 0.56(9) M
⊙, R
1 = 0.48(3) R
⊙, R
2 = 0.65(3) R
⊙, L
1 = 0.11(2) L
⊙, L
2 = 0.16(2) L
⊙. To study the period variation, we fitted the SuperWASP, CSS, ASAS-SN and ZTF survey timing data to obtain light minima times spanning 14 yr. Through O − C analysis, we find that the orbital period of this system has a long-term period decrease and periodic oscillation. The long-term period decrease can be explained by the mass transfer from more-massive component to less one and angular momentum loss via magnetic stellar wind. With the period decrease, this system is evolving from the present shallow contact phase to a relatively deeper stage predicted by the thermal relaxation oscillation theory. Periodic oscillation can be explained by the light-time effect of the cool third body. This third body may play an important role in the early formation and evolution of the binary system by removing angular momentum.
Process design and simulation of industrial-scale biodiesel purification using membrane technology
Authors: Kusumocahyo S P , Redulla R C , Fulbert K , Iskandar A A 
Published: January 2022

Abstract
Biodiesel is commonly produced through a transesterification reaction of vegetable oil with alcohol in the presence of a catalyst to produce fatty acid methyl ester (FAME). The reaction also produces glycerol as a by-product that must be separated from the FAME to obtain a biodiesel product that meets international standards. The common method to remove glycerol from FAME is washing with water. However, it produces a vast amount of wastewater and consumes much energy. Membrane technology is a promising separation technique for removing glycerol from biodiesel on an industrial scale since the separation using membrane does not produce wastewater and the energy consumption is low. In this work, the application of membrane technology to separate biodiesel and glycerol was studied through a process design and simulation of an industrial scale biodiesel purification process with a production capacity of 723 kL/day. A multistage feed-and-bleed microfiltration membrane system was designed to purify biodiesel from glycerol, and the process simulation was carried out using computer programming. The result of the process simulation showed that purified biodiesel could be produced by using the multistage microfiltration membrane system. The minimum membrane area required for the separation process in each stage could be calculated using the computer program. It was found that the total membrane area decreased with the increasing number of stages. A reduction of the total membrane area of 37% was achieved using ten stages microfiltration system. The optimum number of the stages could be determined through a tradeoff analysis of the cost to minimize the capital cost of the multistage membrane system. For the case study in this work, a stage number of 4 was found as the optimum stage number of the microfiltration system. This result showed that the membrane technology has great potential to be applied for the industrial-scale biodiesel purification process.
Potential of biomass and coal co-firing power plants in Indonesia: a PESTEL analysis
Authors: Sugiyono A , Febijanto I , Hilmawan E , Adiarso  
Published: January 2022

Abstract
Biomass co-firing technology for coal power plants has been widely applied in developed countries. The government of Indonesia is currently encouraging the implementation of biomass co-firing to achieve the target of 23% new and renewable energy (NRE) share in the national energy mix by 2025. Although only a few technical issues are left on the implementation of biomass co-firing in coal power plants, the challenges for the large-scale application and the long-term sustainability of the technology still need to be investigated. To identify and overcome these challenges, this paper applies the Political, Economic, Social, Technological, Environmental, and Legal (PESTEL) framework to analyze the business prospects for biomass co-firing for coal power plants. There is potential for biomass co-firing in 114 units of coal power plants with a total capacity of 18.1 GW spread across various locations in Indonesia. As a consequence, it requires around 9 million tons of biomass per year. This huge potential market of biomass opens opportunities for people to participate in supplying the raw materials. The biomass market as co-firing fuels will push agricultural and industrial waste management to be used more efficiently. The biomass supply chain needs to be well developed so that the biomass supply can be sustainable at an economically feasible price, to ensure that electricity prices generated from utilities are affordable for the public. The technical specifications for biomass need to be standardized. The 10% co-firing acceleration of the total coal power plant capacity, or equivalent to around 1.81 GW, can directly contribute to the achievement of the NRE target for the electricity sector and simultaneously reduce greenhouse gas emissions. The government needs to prepare related supporting instruments such as technical regulations, technological and economic aspects, and policy support.
Energy balance analysis on increasing the capacity of a sugar factory in Indonesia
Authors: Wibowo A 
Published: January 2022

Abstract
Sugar is one of the important commodities for Indonesia, whose consumption is increasing along with the increasing population. On the other hand, domestic sugar production stagnated and forced an increase in sugar imports. To overcome this, the government is revitalizing sugar factories to increase national sugar production capacity. The Rendeng Sugar Factory, in Kudus, Central Java, Indonesia, is one of the sugar factories whose capacity has been increased from 2800 TCD to 4000 TCD. This capacity increase, of course, has consequences for an increase in energy consumption for the production process. As a self-sufficient energy system with a source of biomass fuel from bagasse, an energy balance analysis is needed to ensure that the production process can run well. After this capacity increase, the sugar factory will produce 51.27 tons of bagasse/hour used as boiler fuel. There are two boilers, each of which produces superheated steam of 40 tons/hour for Boiler-I and boiler 50 tons/hour for Boiler-II. The superheated steam then flows to several turbines as a power plant and prime mover. The residual steam from the turbine is then used as a heat source in the process, with a requirement of 81.8 tons/hour. With this analysis, energy self-sufficiency with bagasse as fuel can still be fulfilled, and there are even energy reserves.
Copyrolysis of rice husk and plastic bags waste from low-density polyethylene (LDPE) for improving pyrolysis liquid product
Authors: Wijayanti H , Irawan C , Aulia N 
Published: January 2022

Abstract
Rice husk is an agricultural waste from the rice milling process that results in environmental problems during its handling. Biomass (such as rice husk) can be transformed into biofuel via pyrolysis. Pyrolysis is a thermal decomposition of organic compounds in biomass at high temperatures in the absence of oxygen. The main difference of pyrolysis liquid compared to fossil fuel is the significant amount of oxygen (O) content instead of its carbon (C) and hydrogen (H). Thus, making pyrolysis liquid has a lower heating value and inferior properties limiting its direct fuel application. On the other hand, plastic bag waste from low-density polyethylene (LDPE) contains a high C and H with almost no O content. This study conducted co-pyrolysis of rice husk and LDPE at a different percentage (%weight) of LDPE (0, 5, 15, 25, 50, and 75). The pyrolysis temperature was measured using a comparison of thermogravimetric analysis (TGA) curves of rice husk powder and LDPE. The pyrolysis liquid resulted was collected and analyzed. The results show that the increase of LDPE content caused the yield of the organic phase (desired as fuel) of pyrolysis liquid to increase. The properties in the term of heating value also increased while the viscosity and density of pyrolysis liquid decreased. These properties were almost similar to diesel fuel with a slightly lower heating value. However, at 50 % LDPE composition, the wax was formed. Therefore, the optimum composition was 25% of LDPE, resulting in 41.69 MJ/kg of heating value.
Fabrication and characterization of FITC-modified naturalbased silica nanoparticles using sol-gel method
Authors: Sifana N O , Jenie S N A 
Published: January 2022

Abstract
This research aimed to synthesize fluorescent silica nanoparticles (SiFITC) modified with the fluorescein isothiocyanate (FITC) dye using sol-gel method. The FITC dye was used as the fluorophore to produce fluorescent silica nanoparticles. The precipitate from geothermal power plant containing SiO2 was used as a precursor and added with NaOH at 90°C generating sodium silicate. FITC solution was added with various concentrations ranging from 0.1, 0.2, 1, 5 to 10 mg/mL and the mixture was allowed to age for 18 hours. Characterization of SiFITC was measured using fluorescence spectrophotometer to obtain the fluorescence intensity, Fourier Transform Infra-Red (FT-IR) spectroscopy to determine the functional group of SiFITC, Brauner Emmett-Teller (BET) adsorption method to calculate the specific area of the nanoparticles, and X-ray diffraction (XRD) to analyze the crystallographic phases. Fluorescent intensity showed that SiFITC with 1 mg/mL of FITC had the lowest fluorescence intensity indicating self-quenching mechanism due to the overloading of the dye in the silica matrix. The FT-IR spectra showed vibration at wavenumber of 956 (Si-O); 1073 and 798 (Si-O-Si); 3396 (OH) and 1631 cm−1 (Si-OH). BET analysis showed that the specific surface of the SiFITC 480 m2/g and XRD results showed that the samples were in amorphous phase with uniform pore distribution. The results showed that the FITC-modified silica nanoparticles have great potential for further investigation in biosensing applications, particularly fluorescence or optical based detection of antibiotic resistant bacteria.
Synthesis of silica-cellulose aerogel derived from bagasse through impregnation and ambient pressure drying methods as thermal insulator
Authors: Silviana S , Sa’adah A N , Deastuti R P , Ramadhani N C , Simarmata N , Arianto L E , Tiurma M Y , Rahmaningrum J , Fauzi F , Mahmud M A S 
Published: January 2022

Abstract
The trend of research and development of technological advancement in thermal insulators involves using renewable materials, selecting manufacturing processes that require the lowest possible energy, or using waste materials that may help subdue the reduction of petroleum reserves. This review discusses the potential substitution of petroleum by natural materials in thermal insulation manufacturing. This review presents an overview of the definition, properties, materials, and methods that can be used in the manufacture of thermal insulators based on results reported in the literature. Many materials are currently being investigated to produce thermal insulator such as cellulose. Cellulose fiber has a big potential to be used in the manufacture of thermal insulators because cellulose possesses many advantageous properties over petroleum-based polymers, i.e. biocompatibility, biodegradability, thermal stability, chemical stability, and low cost. Another material that may be used is silica, as it has high temperature resistance and low thermal expansion. Bagasse containing high cellulose and silica with the composition of 32-44% cellulose and 55.5%-70% silica. Therefore, bagasse proves appealing to be processed into thermal insulator. Aerogels are among the best thermal insulating materials known. This review proposes the impregnation method followed by the ambient pressure drying (APD) method to synthesize cellulose-silica aerogel. The impregnation of silica into cellulose aerogel will increase mechanical strength, flexibility, and the resulting silica-cellulose aerogel will be transparent with a very low thermal conductivity.
Effect carbon black and modified kaolin hybrid filler on the curing and physic-mechanical properties of natural rubber-styrene butadiene rubber blends
Authors: Susanto T , Rahmaniar  , V Putra V. G. , Sari T I , Farida  , Roni K A , Puspitasari G 
Published: January 2022

AbstractCarbon black is known as an excellent reinforced filler for rubber compounding, this petroleum based product needs to be substituted using renewable or mineral filler due to some negative adverse. In this paper, natural rubber (NR) – styrene-butadiene rubber (SBR) (50/50) phr binary blends based on polyethylene glycol-modified kaolin (PEG-K) and carbon black CB hybrid filler were synthesized. The rubber formulation was designed for idler roller for charcoal conveyor in open peat mining application. The present study investigates the effect of PEG-K and CB composition on curing, physical, tensile and oil, and acid resistance of the binary blends. The effect was examined by varying the composition of PEG-K/CB as follows: 50/0; 40/10; 30/20; 20/30; 10/40; 0/50 phr/phr of the hybrid filler. The rubber compounding was conducted in accordance with the ASTM D3142, and the testing procedures were analyzed based on international standards. The vulcanizates were prepared by heating press at 140 °C for about 25 minutes. The results showed that the processing-ability of a single filler is easier than the higher hybrid filler. The rheological analysis showed that the higher PEG-K may increase the cure rate index, but the lower PEG-K might improve cross-linking density. The higher loading CB improved the specific gravity and hardness, tensile strength slightly, while there is less significant effect on decreasing compression set, abrasion resistance, and elongation at break. Meanwhile, the higher number CB of binary blends has better oil and acid resistance than the PEG-K. Compared to idler roller specification in the market, the vulcanizates in this research have better quality.
Separation of proanthocyanidin from red sorghum seed extract using macroporous resin
Authors: Musdzalifah M , Fahrurrozi M , Sediawan W B , Susanti D Y 
Published: January 2022

Abstract
Proanthocyanidin has been extracted from red sorghum seed with Ultrasound-Assisted Extraction using an aqueous-based solvent. Proanthocyanidin concentration in the extract is relatively low mixing with other compounds. The adsorption method was chosen to separate proanthocyanidin compounds due to the relatively simple operation to recover targeted solutes from low concentration solutions. The purpose of this study was to find an efficient adsorbent for separating proanthocyanidin from red sorghum seed extract. Two types of macropore resin were investigated, namely macropore resin AB-8 and D101. Besides the slight difference in average pores diameter, D101 is non-polar while AB-08 is weak polar resin. The initial concentration of proanthocyanidin compounds in the extract was 0.872 mg/ml. Adsorption processes were performed to reach equilibrium. AB-8 and D101 macropore resins showed adsorption capacity of 34.65 mg/g and 30.36 mg/g with the percent recovery of 79.64% and 69.79%, respectively. Macropore resin AB-8 offers a higher adsorption capacity than macropore resin D101. Additionally, adsorption with AB-8 could reach equilibrium after 24 hours, while D101 took significantly longer to reach equilibrium after 48 hours. While both AB-8 and D101 macropore resins demonstrated reasonable performance as potential adsorbents for recovering proanthocyanidin from red sorghum extract, AB-8 showed better performance in terms of capacity and adsorption rate.