bluuebunny/crossref_metadata_2025_split huggingface dataset:
NiCo2S4 nanosheets decorated on nitrogen-doped hollow carbon nanospheres as advanced electrodes for high-performance asymmetric supercapacitors
Authors: Li Bei , Xie Ling , Liu Yanping , Yao Dongrui , Yao Lei , Deng Libo 
Published: November 2021

Abstract
Taking advantage of both Faradaic and carbonaceous materials is an efficient way to synthesize composite electrodes with enhanced performance for supercapacitors. In this study, NiCo2S4 nanoflakes were grown on the surface of nitrogen-doped hollow carbon nanospheres (NHCSs), forming a NiCo2S4/NHCS composite with a core–shell structure. This three-dimensionally confined growth of NiCo2S4 can effectively inhibit its aggregation and facilitate mass transport and charge transfer. Accordingly, the NiCo2S4/NHCS composite exhibited high cycling stability with only 9.2% capacitance fading after 10 000 cycles, outstanding specific capacitance of 902 F g−1 at 1 A g−1, and it retained 90.6% of the capacitance at 20 A g−1. Moreover, an asymmetric supercapacitor composed of NiCo2S4/NHCS and activated carbon electrodes delivered remarkable energy density (31.25 Wh kg−1 at 750 W kg−1), excellent power density (15003 W kg−1 at 21.88 Wh kg−1), and satisfactory cycling stability (13.4% capacitance fading after 5000 cycles). The outstanding overall performance is attributed to the synergistic effect of the NiCo2S4 shell and NHSC core, which endows the composite with a stable structure, high electrical conductivity, abundant active reaction sites, and short ion-transport pathways. The synthesized NiCo2S4/NHCS composite is a competitive candidate for the electrodes of high-performance supercapacitors.
Novel melamine-based porous organic polymers: synthesis, characterizations, morphology modifications, and their applications in lithium–sulfur batteries
Authors: Liu Haiyang , Wang Jiaxing , Sun Miao , Wang Yu , Zhao Runing , Zhang Xiaojie , Zhao Yanfei 
Published: November 2021

Abstract
Lithium–sulfur (Li–S) batteries have been considered to be one of the most promising energy storage devices in the next generation. However, the insulating properties of sulfur and the shuttle effect of soluble lithium polysulfides (LiPSs) seriously hinder the practical application of Li–S batteries. In this paper, a novel porous organic polymer (HUT3) was prepared based on the polycondensation between melamine and 1,4-phenylene diisocyanate. The micro morphology of HUT3 was improved by in situ growth on different mass fractions of rGO (5%, 10%, 15%), and the obtained HUT3-rGO composites were employed as sulfur carriers in Li–S batteries with promoted the sulfur loading ratio and lithium-ion mobility. Attributed to the synergistic effect of the chemisorption of polar groups and the physical constraints of HUT3 structure, HUT3-rGO/S electrodes exhibits excellent capacity and cyclability performance. For instance, HUT3-10rGO/S electrode exhibits a high initial specific capacity of 950 mAh g−1 at 0.2 C and retains a high capacity of 707 mAh g−1 after 500 cycles at 1 C. This work emphasizes the importance of the rational design of the chemical structure and opens up a simple way for the development of cathode materials suitable for high-performance Li–S batteries.
Teaching kinematics via arduino based STEM education material
Authors: Çoban Atakan , Erol Mustafa 
Published: November 2021

Abstract
The present study reports an Arduino-based STEM education material that resolves the kinematics of a moving object, specifically focusing on two dimensional motion of the object. Throughout the work, a sample application that can be prepared in a classroom where students are active and including the acquisitions of Technology, Engineering, Physics and Mathematics in a single educational environment. In the study, instantaneous time dependence of the displacements, namely x(t) and y(t) components and the resultant R(t) component, are experimentally measured on a vehicle by using an Arduino UNO, distance sensors and Bluetooth sensor prepared within the scope of a STEM education approach. The ratios between those measured physical quantities and theoretical estimations are found to be %13.1 for the position, %1.4 for the velocity and %7.8 for the acceleration. The error rate of the data was accepted to be reasonable considering highly economical teaching materials.
Quench position reconstruction through harmonic field analysis in superconducting magnets
Authors: Mariotto S , Sorbi M 
Published: November 2021

Abstract
The performances of superconducting magnets for particle accelerators are limited by instabilities or disturbances which lead to the transition of the superconducting material to the normal resistive state and the activation of the quench protection system to prevent damage to the magnet. To locate the position of the state transition, voltage taps or quench antennas are the most commonly used technologies for their reliability and accuracy. However, during the production phase of a magnet, the number of voltage taps is commonly reduced to simplify the construction process and quench antennas are generally used only for dipoles or quadrupoles to limit the antenna design complexity. To increase the accuracy in the reconstruction of the quench event position, a novel method, suitable for magnets with independent superconducting coils and quench protected without the use of quench heaters, is proposed in this paper. This method, based on standard magnetic measurement techniques for field harmonic analysis, can locate the position of the superconductor transition inside the magnet after the quench event when the magnet has been discharged. Analyzing the not allowed harmonics produced in the field quality at zero current, the position of the quenched coils can be retrieved for any magnet orders without increasing the complexity of the dedicated measurement technique.
Controllable rectification on the irreversible strain limit of 2G HTS coated conductors
Authors: Su Xiyang , Huang Zhiting , Liu Cong , Zhang Xingyi 
Published: November 2021

Abstract
The second generation high-temperature superconducting coated conductors (CCs) have excellent electrical and mechanical properties, and are extensively used in superconducting devices such as fault current limiters, magnets and motors. During the operation of these superconducting devices, superconducting CCs inevitably bear the combination of electromagnetic force and thermal mismatch stress, resulting in straining of YBa2Cu3O7−

δ
(YBCO) layer along the tape length. It is well known that the strains of superconducting CCs cause degradation of critical current (I
c). Generally, the irreversible strain limit (

ε

irr

) is used to characterize the phenomenon that I
c of superconducting CCs degrades with axial strain. When the axial strain of superconducting CCs is less than

ε

irr

, I
c can be reversibly recovered by over 99% after being unloaded. Therefore,

ε

irr

is a key parameter for the design and application of superconducting CC devices. For this reason, to carry out a practical engineering method for improving

ε

irr

of superconducting CCs has become a challenge and aroused interests among researchers. This study is based on the idea of precompression. A 316LN stainless steel tape was pretensioned at 77 K to improve its elastic strain limit. Then, two superconducting CCs were soldered onto both surfaces of pretensioned stainless steel tape respectively. As a result,

ε

irr

of the superconducting CCs can be controlled manually with different precompressions. Taking YBCO CCs produced by SuperPower Inc. as an example, the measurement results show that the

ε

irr

of the YBCO CCs increased from 0.39% to 0.73%. Meanwhile, the thickness of the sample did not increase more than once.
Transverse distribution of critical current density in Ag-sheathed Ba1−

x
K
x
Fe2As2 tapes
Authors: Yang Peng , Huang He , Han Meng , Guo Wenwen , Tu Chang , Wang Dongliang , Zhang Xianping , Ma Yanwei 
Published: November 2021

Abstract
The Ag-sheathed Ba1−x
K
x
Fe2As2 (Ba-122) monofilamentary tapes were prepared by the ex-situ powder-in-tube method. The variation of the microstructure and superconducting properties with the thickness of the superconducting core in the cross-section of sintered tapes is studied. At the same time, the reason is studied in comparison with the unsintered tapes. The research results show that the magnetic J
c of the iron-based superconducting tapes increases continuously with distance from the core-sheath interface, which is the complete opposite of the Bi-based superconductor. The magnetic J
c of central layers for final Ba-122 tapes is about 33% higher than the Jc
of the whole tape at 4.2 K and 7 T. We have found that the center of the superconducting core shows higher hardness and better texture. In addition, it is also found that there is a reaction layer at the Ag-superconductor interface. These reasons may result in the reduction of the critical current density near the interface in the tapes. Moreover, we also found the presence of a reaction layer in the hot-pressed (HP) high-performance samples. However, no unevenness was found in the unsintered samples. Therefore, the superconductivity of Ba-122 tapes will be better by reducing the reaction layer and eliminating inhomogeneity at the core-sheath interface of the sintered tapes.
Predicting ferromagnetism and thermoelectric characteristics in bulk spinels ZnCr2X4 (X = S, Se) using density functional theory
Authors: Mahmood Asif , Ramay Shahid M , Al-Masry Waheed , Al-Zahrani Ateyah A 
Published: November 2021

Abstract
To have control over the properties of electronic devices with the help of the spin of electrons is considered an amalgamation field of innovative technology. The thermoelectric and ferro-magnetic characteristics of bulk ZnCr2X4 (X = S, Se) spinels have been investigated by the BoltzTraP and WIEN2k codes. The optimization of the fully relaxed structures has been performed by PBE generalized gradient approximation (GGA) for the exposure of ground state parameters and our calculated results of lattice constant represent a reasonable agreement with experimental values. The comparative analysis of the energies that emerged fromnonmagnetic and ferromagnetic states using PBE-GGA shows that the state is the ferromagnetic. The modified Becke-Johnson local density approximation (mBJLDA) has been brought into use for the computation of the density of states (DOS) and precise band structures (BS), which authenticates the ferromagnetic semiconducting behavior. Further, the calculation of exchange splitting energies, John-Teller energy, and crystal field energy explored the origin of ferromagnetism. The strong hybridization resulting in decomposition in Cr, the magnetic moment and creates the magnetic moments at the nonmagnetic sites. Consequently, the thermoelectric characteristichas been explored by the BoltzTraP code that reveals that the increasing temperature increases the power factor, the thermal conductivity, and the electrical conductivity whereas the Seebeck coefficient reduces with it. However, the compounds in our study prove to be suitable for being used in thermoelectric devices for alternative energy resources.
Tunneling dynamics in cosmological bounce models
Authors: Bojowald Martin , Jones Brenda 
Published: November 2021

Abstract
Quasiclassical methods are used to define dynamical tunneling times in
models of quantum cosmological bounces. These methods provide relevant new
information compared with the traditional treatment of quantum tunneling by
means of tunneling probabilities. As shown here, the quantum dynamics in
bounce models is not secure from reaching zero scale factor, re-opening the
question of how the classical singularity may be avoided. Moreover, in the
examples studied here, tunneling times remain small even for large barriers,
highlighting the quantum instability of underlying bounce models.
Intracortical probe arrays with silicon backbone and microelectrodes on thin polyimide wings enable long-term stable recordings in vivo
Authors: Kilias Antje , Lee Yu-Tao , Froriep Ulrich P , Sielaff Charlotte , Moser Dominik , Holzhammer Tobias , Egert Ulrich , Fang Weileun , Paul Oliver , Ruther Patrick 
Published: November 2021

Abstract

Objective. Recording and stimulating neuronal activity across different brain regions requires interfacing at multiple sites using dedicated tools while tissue reactions at the recording sites often prevent their successful long-term application. This implies the technological challenge of developing complex probe geometries while keeping the overall footprint minimal, and of selecting materials compatible with neural tissue. While the potential of soft materials in reducing tissue response is uncontested, the implantation of these materials is often limited to reliably target neuronal structures across large brain volumes. Approach. We report on the development of a new multi-electrode array exploiting the advantages of soft and stiff materials by combining 7-µm-thin polyimide wings carrying platinum electrodes with a silicon backbone enabling a safe probe implantation. The probe fabrication applies microsystems technologies in combination with a temporal wafer fixation method for rear side processing, i.e. grinding and deep reactive ion etching, of slender probe shanks and electrode wings. The wing-type neural probes are chronically implanted into the entorhinal-hippocampal formation in the mouse for in vivo recordings of freely behaving animals. Main results. Probes comprising the novel wing-type electrodes have been realized and characterized in view of their electrical performance and insertion capability. Chronic electrophysiological in vivo recordings of the entorhinal-hippocampal network in the mouse of up to 104 days demonstrated a stable yield of channels containing identifiable multi-unit and single-unit activity outperforming probes with electrodes residing on a Si backbone. Significance. The innovative fabrication process using a process compatible, temporary wafer bonding allowed to realize new Michigan-style probe arrays. The wing-type probe design enables a precise probe insertion into brain tissue and long-term stable recordings of unit activity due to the application of a stable backbone and 7-µm-thin probe wings provoking locally a minimal tissue response and protruding from the glial scare of the backbone.
Electrical Bioimpedance Phase Angle and Sarcopenia Diagnostic in Functional Elderly
Authors: Villada-Gómez J S , González-Correa C H , Pineda-Zuluaga M C 
Published: November 2021

Abstract
Bioelectrical impedance analysis (BIA) directly measures the phase angle (PA). PA has been associated with nutritional parameters, strength, and muscle mass, emerging as a possible and novel diagnostic marker of sarcopenia. The aim of this study was to establish PA cut off points for diagnosing sarcopenia in functional elderly from Colombia. 255 volunteers were analyzed. PA measurements taken by BIA were used, and the level of correlation with hand grip strength (HGS) and skeletal muscle mass index (SMMI) was established. In men and women, PA had a direct correlation with SMMI (p=0.010; r=0.252) (p=0.003; r=0.237) and with HGS (p=0.038; r=0.206,) (p=0.019; r=0.190) respectively. We used different statistical approach to stablish various cut off points with their sensitivities and specificities. The ROC curves and areas under curve were elaborated (0.91 in men and 0.56 in women). 6.12 ° in men and 5.74 ° in women are proposed as cut off points to diagnose sarcopenia, with good performance in men and less adequate performance in women, demonstrating the differences in body composition according to sex even within the same population and the need for further studies to relate these cut-off points with functional outcomes.
The existence of epiphyte on thallus Eucheuma denticulatum (Rhodophyceae) in varying depths cultivated with vertical net method
Authors: Wati N , Kasim M , Salwiyah  
Published: November 2021

Abstract
The existence of macroepiphyte is one of the issues seaweed farmers often face. This research aims to explore the existence of macroepiphyte attached to seaweed Eucheuma denticulatum at varying depths using vertical net method. Research found that the highest and the lowest velocity of macroepiphyte on day -10 in the depth of 50 cm and 200 cm is 248,4 and 121,28 ind/m2/day. On day-20, in the depth of 100 cm and 200 cm is 333,54 and 270,01 ind/m2/day. The most dominating macroepiphyte in the attachment velocity is C. Crasa. Physical and chemical parameter showed around 29o-30oC. Current velocity 0,050-0,067 m/sec. Brightness 92%. Salinity 30-33‰. Nitrate 0,237-0,0416 mg/L. Phosphate 0,0015-0,0036 mg/L. Dissolved oxygen 5,7-6,2 mg/L. The obtained optimum environmental parameter and the type of the macroepiphyte attachment did not show any significant negative effect to the growth of E. denticulatum.
Heavy metal (Hg, Cd, Pb, Cu) in the long whiskered catfish (Mystus gulio Hamilton, 1822) in Bojonegara Coastal Waters of Banten Bay, Indonesia
Authors: Lestari K O , Sulistiono S , Effendi H 
Published: November 2021

AbstractAnthropogenic activities such as industrial, domestic, and shipping are the main contributors to the entry of heavy metals into the Banten Bay and the surrounding areas. This research was conducted from August to October 2020 in the coastal waters of Bojonegara, Banten Bay. This study aims to estimate the accumulation of heavy metals (Hg, Cd, Pb and, Cu) contained in long whiskered catfish (Mystus gulioHamilton, 1822) and to determine the tolerance limit for consumption the fish in the Bojonegara coastal waters of Banten Bay. Fish samples were taken using the purposive sampling once per month. Based on the analysis, the heavy metal content in the fish meat were <0.001 mg/kg (Hg), <0.005 mg/kg (Cd), <0.030 mg/kg (Pb) and 0.699-10.920 mg/kg (Cu); the values were less than NADFC of Indonesia (2018) and the Regulation of the Minister of Health Republic of Indonesia 382/1989 with a standard of 0.500 mg/kg (Hg), 0.100 mg/kg (Cd), 0.200 mg/kg (Pb), 20 mg/kg (Cu). The fish caught in Bojonegara Coastal Waters of Banten Bay have moderate to high accumulation levels of Copper (Cu). The safety level forMystus guliois 16.03 kg fish/week (for adults) and 4.81 kg fish/week (for children).
The level of preparedness of trained labor in marine and fisheries sectors towards globalization
Authors: Pramoda R , Muliawan I , Apriliani T , Witomo C M , Yulisti M , Arthatiani F Y , Putri N P S 
Published: November 2021

Abstract
Building the quality of the workforce in the marine and fisheries sector through formal education is a strategic step to improve the quality of human resources to support the national economy. Workers with skills and competency are capital in increasing economic growth. This study aims to examine the readiness of trained workforces in the marine and fisheries sector in the globalization era, especially in Industry Era 4.0. This study employs qualitative analysis with a case study approach and is represented descriptively. The results show that almost all graduates of marine and fisheries vocational schools were employed. However, some findings are discovered: 1) lack of practice facilities in vocational schools; 2) lack of ability of graduates of foreign language vocational schools; 3) the internship program for prospective trained workers, especially in foreign industries, has not been facilitated by the government. Some recommendations should be considered: 1) allocate a higher budget to add or improve facilities and infrastructure, 2) increase hours of study on foreign language skills or invite professional native teachers to improve foreign language skills, and 3) promote cooperation with foreign industry to manage internship programs abroad before entering the industry.
Population structure of lamp shells (Brachiopoda: Lingula anatina Lamarck, 1801) in Aceh Northern Shore, Indonesia
Authors: Octavina C , Ulfah M , Nurfadillah N , Agustina S , Niwatana J , Al-Ihsan M T , Irsyad M 
Published: November 2021

Abstract
This study aimed to determine the population structure of Lingula sp. in the Aceh northern shore. This research uses purposive sampling method where the sampling locations at Ujong Pancu beach, Kuala Cangkoi beach, Syiah Kuala beach and Alue Naga beach. Sampling was carried out using a quadratic transect (1x1 m) with three stations at each location. The results showed that there is one type of Brachiopods, namely the genus Lingula (Bruguière 1791), species Lingula anatina Lamarck, 1801 which are scattered on the north coast of Aceh. Overall, the abundance of L. anatina was quite high at each location, especially at Kuala Cangkoi beach (2.43 ind/m2), while the lowest abundance was found at Ujong Pancu beach (1,11 ind/m2). In addition, it was also found that L. anatina had a similarity distribution on the Aceh northern shore. The existence of L. anatina on the Aceh northern shore is very dependent on good environmental conditions, in general, the quality of the waters of Aceh northern shore is still within the tolerance limits of these biota. Therefore, population structure of L. anatina is stable, so that this biota resource must continue to be considered and managed properly.
Small scale tuna fisheries profiles in the Indonesia archipelagic waters
Authors: Muawanah U , Arthatiani F Y , Soedjarwo P A , Kurniasari N , Sari Y D , Zulham A , Koeshenderajana S , Hikmah H 
Published: November 2021

AbstractIndonesia is one of the largest tuna producers in the world, which contributes 16% to world tuna production. The dominant tuna species catched in Indonesia are Albacore Tuna (Thunnus alalunga), Madidihang/Yellowfin Tuna (T. albacares), Big Eye Tuna (T. obesus) dan Southern Bluefin Tuna (T. maccoyii). The tuna fisheries have contributed significant jobs or livelihood to the coastal communities. Profit and revenue sharing is a common remuneration system found on tuna fisheries though out Indonesia. However, these fishers are vulnerable given their economic and welfare conditions and of usually limited options of others livelihood. Small fishers have limited access to livelihoods, access to finance and access to skills or fishing technology. Therefore, the inclusion of socio-economic performance or indicators into the tuna fisheries management is crucial in Indonesia.
Identification of Vibrio spp. causing vibriosis in spiny lobsters (Panulirus homarus L.) in Bengkulu marine temporary shelter ponds
Authors: Wibowo R H , Sipriyadi  , Darwis W , Susianti N , Yudha S P , Rosianti N 
Published: November 2021

Abstract
Spiny lobster (Panulirus homarus) is one of the export commodities of the Indonesian fisheries subsector and an important component for shrimp fisheries in Indonesia. In the development of lobster cultivation, there are several obstacles, the presence of vibriosis infection caused by the pathogenic Vibrio bacteria. This study aimed to identify Vibrio spp. bacteria in spiny lobsters (P. homarus) reared in the marine cultivation ponds, Bengkulu, Indonesia. Clinical symptoms of lobsters infected with vibriosis are red spots on the uropod, pleopod, and abdominal parts. Bacterial isolation was conducted by isolated some internal organs in spiny lobsters, that are, gills, stomachs, haemolymph, and hepatopancreas. The result showed there are 5 isolates of Vibrio bacteria that coded by IN3, ST2, HA1, HP2, and HP3. These bacteria isolates were identified through their colony morphology and biochemical tests. Characterization on the Thiosulfate Citrate Bile Salt Sucrose (TCBS) medium showed that lobsters were infected with Vibrio species. Based on Bergey’s Manual of Determinative Bacteriology, Austin and Austin, the identification results showed that HA1 isolate was identified as Vibrio algynolyticus, IN3 isolate was identified as V. anguillarum, ST2 was identified as V. ordalii, HP2 in first lobster was identified as with V. algynolyticus that mostly in the hepatopancreas, and HP3 was identified as V. splendidus