bluuebunny/crossref_metadata_2025_split huggingface dataset:
An Up-conversion Management Circuit for Electrical Field Energy Harvester
Authors: Wen Y M , Li P , Han T , Ji X J 
Published: December 2019

Abstract
This paper presents a high-efficiency management circuit using a maximum power point tracking (MPPT) matching circuit for power-line electrical energy harvesting. Due to small internal capacitor of the transducer and heavy load, the traditional circuit of the electrical energy harvesting at a low working frequency of 50Hz has a low transducer efficiency, and cannot be used in both low power-line voltage and heavy load. Besides, the matching impedance varies with the charging voltage. In order to achieve maximum output power during whole charging process, an up-conversion MPPT matching circuit is developed. Higher charging power, and larger ultimate charging voltage in a power-line voltage of 4000V can be obtained by using the MPPT up-conversion matching circuit. In order to drive the wireless sensor with a higher consumption power, an instantaneous discharging circuit is developed. The instantaneous discharging circuit can accumulate weak energy during a long period, and provide a higher power output in a very short time. The management circuit can drive wireless sensor with an output power of 60mW.
Power Management with Dynamic Power Adaption for a Rotational Energy Harvester in a Maritime Gearbox
Authors: Esch J , Schillinger D , Stojakov D , Hoffmann D , Manoli Y 
Published: December 2019

Abstract
Rotational Energy Harvesting becomes increasingly important for rotating sensor applications. Most of these applications rotate with changing revolution speed, which is a significant challenge for the energy harvesting system. This work presents an energy harvesting system for rotational motion with a new power management concept to generate energy for a wireless condition monitoring system. The challenge is to generate enough energy with a high efficiency factor at the minimum revolution speed but also to avoid problems with energy excess and high voltages at the maximum revolution speed. The power management includes solid state relays for coil switching to avoid the generation of excess energy that would lead to increased temperature. At 500 rpm the energy harvester generates 193 mW. With an efficiency of 54% the power management provides an output power of 106 mW.
Reducing human body heating and temperature rises due to inductively-powered implantable medical devices
Authors: Kwan C H , Yates D C , Mitcheson P D 
Published: December 2019

Abstract
The use of inductive power transfer (IPT) for medical implants can cause heating and temperature rises in human tissue. Increasing the load resistance away from the optimal value for maximising link efficiency has been shown to reduce the specific absorption rate (SAR) and temperature rises in a human body model in electromagnetic and thermal simulations. However, these quantities are generally difficult to measure as they are internal to the body, so experiments with a phantom should be used to verify the theory and simulations. This paper presents results of an experiment, in which 10 W is delivered to a receiver immersed in salt water with two different load resistances. The temperature rise of the salt water was lower with the use of the increased load. Simulations of the experimental setup demonstrate good agreement with experimental results.
A magnetically-sprung nonlinear resonator for wideband vibration energy harvesting consisting of magnetic composite and ring magnets
Authors: Miyata Y , Masuda A , Zhao F , Ushiki S 
Published: December 2019

Abstract
This paper presents a novel design of a magnetically-sprung mechanical resonator for wideband vibration energy harvesting. In this design, a magnet composite consisting of two cylindrical magnets composed in a repelling arrangement is used as a moving mass, which is magnetically suspended between two ring magnets. This configuration yields more significant variation of stiffness in a shorter stroke compared with the previous design, resulting in wider operation band even under small excitation.
MEMS power generator operated by fluorocarbon gas
Authors: Kaneko M. , Kudo K. , Ebisawa K. , Tanaka K. , Uchikoba F. 
Published: December 2019

Abstract
This paper proposed a MEMS air turbine generator. The conventional miniature power sources like a battery required a replacement. Therefore, it is limitation for an IoT (Internet of Things) device, and it is required to develop a miniature generator. The proposed generator shows a millimetre scale structure that combined the different technology. The MEMS process is used for the miniature air turbine structure. To achieve the high output power, the electromagnetic induction type is employed. The miniature magnetic circuit is fabricated by the multilayer ceramic technology. Fluorocarbon gas is used as a working fluid to generate the rotational motion of the rotor. By this reason, the miniature power generation system will be realized in the future. Dimensions of the fabricated MEMS power generator were 5.62 mm, 6.17 mm, and 7.12 mm, respectively. The rotational motion was demonstrated using R245fa of fluorocarbon gas. The maximum rotational speed was 154,620rpm when the outside temperature was 46.3 Celsius degree. The output voltage was 10 mV at the load resistance of 1 kΩ. The calculated output power was 0.6 mVA at when the load resistance was 2 Ω.
Aging assessment of piezoelectric energy harvester using electrical loads
Authors: Hoang T , Ferin G , Bantignies C , Rosinski B , Vince P , Nguyen-Dinh A 
Published: December 2019

Abstract
Vibrational energy harvesting is an alternative solution for replacing batteries in autonomous wireless devices. Besides the performance of piezoelectric energy harvesting generators, the reliability of such structures must be considered when long lifetime is required. In this paper, we propose a new approach based on stress electrically induced to deal with aging of piezoelectric bimorph structure for vibrational energy harvesting. To this end, induced mechanical stress in bimorph structure using electrical solicitation is investigated and compared with mechanical excitation by using finite element modelling. A dedicated test bench was developed. An accelerated aging test of a piezoelectric bimorph operated at 178.5Hz (9x resonance frequency in real use) under a maximum stress of 50MPa using stress electrically induced approach was performed during 4 months. The results are discussed and showed the feasibility of this electrical approach for reliability studies of piezoelectric energy harvesting devices.
Output Power of Piezoelectric MEMS Vibration Energy Harvesters Under Random Oscillation
Authors: Murakami S , Yoshimura T , Aramaki M , Kanaoka Y , Tsuda K , Satoh K , Kanda K , Fujimura N 
Published: December 2019

Abstract
The output characteristics of MEMS piezoelectric vibration energy harvesters (PVEHs) under random oscillations are analysed. We fabricated cantilever-type MEMS-PVEHs using Pb(Zr,Ti)O3 films. The autocorrelation function of the transient displacement of the cantilever tip under random oscillations features a narrow-band random vibration. From the power spectral density (PSD) of the output voltage of the PVEHs, the resonance frequency decreases and the full-width at half-maximum increases with increasing vibration acceleration. By comparing output properties under various sinusoidal oscillations, nonlinear effects including the soft-spring effect and nonlinear damping effect clearly influence the output characteristics under random oscillations. The power generation is proportional to the square of the vibration acceleration even in the acceleration region where nonlinear effects become conspicuous.
Upper bound for the power outputs of linear vibrational power harvesters: translational vs. rotational geometries
Authors: Ananthakrishnan Akshay , Bargatin Igor 
Published: December 2019

Abstract
Inertial harvesters utilize the motion of a translating or rotating mass to scavenge power from ambient vibrations. For translational harvesters, analytical expressions describing the influence of size on the output power of these harvesters have been derived previously by modeling vibrations as sinusoids or white noise. In this paper, we present a general method to estimate the size-dependent power outputs of both translational and rotational harvesters for vibrations with an arbitrary power spectral density. Using the heights and widths of the peaks in the vibrational power spectral density, we derive simple analytical expressions for the maximum power output of harvesters and the minimum harvester size required to achieve it. To illustrate an application of these estimates, we analyze the case of walking-induced vibrations produced at the hip-pocket and upper-arm locations. We find that rotational designs can outperform translational ones only when the harvester is larger than 26 cm and 8 cm for the hip-pocket and arm locations, respectively.
Minimizing power consumption of LoRa® and LoRaWAN for low-power wireless sensor nodes
Authors: Bäumker E , Miguel Garcia A , Woias P 
Published: December 2019

Abstract
In this paper we show that RF transmissions using the physical layer of the “Long Range” (LoRa®) interface, and with some limitations also the data link and network layer Long Range Wide Area Network (LoRaWAN), are suitable even for extremely power-restricted devices, like energy-autonomous wireless sensor nodes (WSNs), if configured well. We analyse the most critical parameters and their influence on the power performance. This includes the outer circuitry, software and configuration of the transmitter SX1276 and the new SX1262. Based on that, we give specific advice to lower their power consumption and verify the impact of these measures with evaluations on an own build low power sensor node.
Improved micronanogenerators based on silicon compatible materials and processing
Authors: Donmez I , Dolcet M , Stranz A , Salleras M , Fonseca L , Gadea G , Pacios M , Morata A , Tarancon A 
Published: December 2019

Abstract
Our work on all-silicon thermoelectric micro power generation is reviewed including the latest improvements. Our devices use low-dimensional silicon-based thermoelectric material, namely Si and (for the first time) SiGe nanowires. A new redesign leading to a significant reduction in parasitic device thermal conductance and lower electrical resistance has been tested and a route for the integration of a heat exchanger onto it has been recently attempted. Power densities of a few tens of μW/cm2 have been achieved.
Secondary-side de-tuning to enable wide-range Inductive Power Transfer for a wrist worn sensor
Authors: Burrow S , Clare L 
Published: December 2019

Abstract
Powering body worn electronics via inductive power transfer is made more challenging by the poorly constrained relative position of the coils and the consequential wide range of magnetic coupling between them. Somewhat counter intuitively for systems that must operate with coupling factors varying over an order of magnitude it is the design of the receiver side circuits during periods of high coupling that can be most problematic. In this paper a novel low-cost, low power receiver circuit is presented that can automatically compensate for higher coupling by altering the secondary tuning.
Simulation and Modelling of a Spatially-Efficient 3D Wireless Power Transfer System for Multi-User Charging
Authors: Wang Han-Wei , Wang Nelson Xuntuo , Lang Jeffrey H. 
Published: December 2019

Abstract
This paper presents the design, modelling and simulation of a wireless power transfer system with improved 3D spatial efficiency. It is shown that a rotational field driven by balanced magnetic coils carrying phase-shifted currents can achieve almost uniform efficiency in 3-D space. Both 2-coil and 3-coil transmitting systems are designed and studied. Effective mutual inductance is proposed to visualize the magnetic fields from a multiple transmitter system, and efficiency distributions are simulated. Different excitation modes including phase-shifted and non-phase-shifted currents are analysed and compared. The results provide an approach to the design and excitation of the 3D multiple-transmitting-coil system.
Highly Oriented and Stress Modified Thick AlN Films Deposited on Low Thermal Expansion Alloy Substrates for Flexible Electronics in Harsh Environment
Authors: Moriwaki N , Minh L V , Kuwano H 
Published: December 2019

Abstract
Highly oriented and stress-modified thick aluminium nitride (AlN) films were deposited by reactive AC magnetron sputtering on 4 inch substrates and foils made of the low thermal expansion alloy “42Alloy” for flexible electronics in harsh environment. As a result of modification of film depositing conditions for reducing residual stress, a flat three micrometer thick AlN film was deposited successfully on the 50 μm thick 42Alloy foil, and its full width at half maximum of AlN(002) was 5.00 degree. And, it was confirmed that the AlN films on 42Alloy foils have piezoelectricity by measurement of a tip displacement of the cantilever-shape test structure.
Influences of Fe-Ga Alloy Crystallinity for the Application to a Magnetostrictive Vibration Energy Harvester
Authors: Ito M. , Minamitani T. , Ueno T. 
Published: December 2019

Abstract
An isotropic poly-crystalline Fe-Ga alloy was fabricated using a short-time process and its performance as a magnetostrictive vibration energy harvester was evaluated. Grain enlargement due to recrystallization was observed by annealing treatment exceeding 1100 °C, but no contribution to physical properties and power generation performance was observed. It was confirmed that the magnetostrictive vibration energy harvester using poly-crystal functioned and an output of 1.1 mW was obtained under the vibration condition of a resonance frequency of 106 Hz and acceleration of 0.8 G. This is an output of 28% compared with the case of using a single crystal. In a trial calculation, poly-crystalline Fe-Ga alloy can be fabricated at a cost of 1/6 of a single crystal, so potential for using poly-crystal is expected in applications not requiring high output.
MEMS meander harvester with tungsten proof-mass
Authors: Köhler E , Johannisson P , Kolev D , Ohlsson F , Ågren P , Liljeholm J , Enoksson P , Rusu C 
Published: December 2019

Abstract
Using current battery technology the life-time of a leadless pacemaker is approximately 6-10 years, with a large portion of the pacemaker occupied by the battery. This paper investigates the possibility to use a MEMS piezoelectric harvester as a complementary energy source in leadless pacemakers. The challenge is to combine the low resonance frequency required to harvest energy from a heartbeat with the small volume of 20×4×3 mm3 available, with the corresponding harvester displacement restricted to 2 mm. Due to the displacement restriction the selected structure was a double clamped bridge in order to reduce the mass displacement, with various meander-type designs simulated to reduce resonance frequency. To further reduce resonance frequency large proof-masses of tungsten were attached by gluing. Two types of tungsten proof-masses were added to four different harvesters, 16.4 mg and 16.6 mg on sample 1 and 2 and 502 mg and 492 mg proof-mass on sample 3 and 4. The structures have 2 µm patterned PZT (deposited by sol-gel technique) and Pt metal electrodes for d31 mode harvesting. The power output measured from one of the two PZT/electrodes was 0.13 nW with 50 µm deflection at 100 k Ω optimal load resistance and 9.1 mVpp at 232 Hz.
The potency of bio-organic fertilizer containing local microorganism of Cibodas village, Lembang-West Java
Authors: Sodiq A H , Setiawati M R , Santosa D A , Widayat D 
Published: December 2019

Abstract
This experiment was conducted to determine the characteristics of biofertilizers usually called as Local Microorganism (LM) with the raw materials that is easily obtained in the village of Cibodas Lembang. This experiment included ten main raw materials as media for growing LM, including: Bamboo Root, Spring Onion, Broccoli Leaves, Banana Stump, Leaves of Water Hyacinth, Goat Manure, Rabbit Manure, Chicken Manure, Cow Manure and Rabbit Urine. The LM was enriched with material sugar and carbohydrates then incubated for 2 weeks. Parameters observed in the laboratory include IAA hormones, cytokines and gibberellins. The microorganism living in the LM i.e Total microorganism (Total Plate Count Aerob), Azospirillium, Azotobacter and Trichoderma were also analysed. The results showed that the LM with raw materials from chicken manure showed the highest hormone content in both IAA, Cytokinin (Zeatin), Cytokinin (Kinetin) and Giberelin with the following values: 141.28 ppm, 115.63 ppm, 126.49 ppm, 165.13 ppm, respectively. The same LM showed highest number of microorganisms based on TPC method and Trichoderma with a value of 3.75 x 108, 6.80 x 105 CFU/ml. As for the analysis of the LM goat manure contain the highest number of Azospirillium which population of 2.4 x 105 CFU/ml and the highest population of Azotobacter sp was found in LM of rabbit manure with a value of 6.95 x 103 CFU / ml.
The Utilization of Vegetable Waste Silage as Feed Ingredient in Diets for Tilapia Oreochromis niloticus
Authors: Putra A N , Jaenudin  , Sofia F , Mustahal  , Syamsunarno M B , Hermawan D , Herjayanto M 
Published: December 2019

Abstract
The vegetable waste silage is potential as a feed ingredient for tilapia culture. Silage is a product of the processing of materials by the addition of acid or by anaerobic fermentation. This study aimed to evaluate the effect of vegetable waste silages on the growth of tilapia (Oreochromis niloticus). Formic acid is used in this study as organic acid for the preservative. Four diets concentration of formic acid in making silage (0%, 3%, 4%, and 5%) was formulated containing 27% crude protein. The result showed that total digestibility, protein digestibility, and fat digestibility were significantly higher (P<0.05) in 4% formic acid and 5% formic acid than Control. The value of growth was significantly highest (P<0.05) in 5% formic acid (2.96±0.08 %/day), followed by 4% formic acid (2,66±0,14 %/day), 3% formic acid (2,56±0,05 %/day) and control (2,54±0,21 %/day). The utilization of 5% formic acid in making vegetable waste silage showed the best result on growth and feed efficiency than the other treatments.
Selection of potential genotypes and traits evaluation of honeydew (Cucumis melo L.)
Authors: Iskandar B A , Suwarno W B , Gunawan E , Saptomo S K 
Published: December 2019

Abstract
Quality improvements of honeydew (Cucumis melo L.) can be carried out by developing new superior hybrid varieties. This study aimed to identify potential genotypes having good fruit quality for breeding improved hybrid honeydew varieties. The experiment was conducted from March to May 2019 at the Tajur II experimental station of PKHT, IPB University, Bogor. The experiment was arranged in a single-factor randomized complete block design with three replicates. There were six test genotypes from S2 generation, namely IPB HD1, IPB HD2, IPB HD3, IPB HD4, IPB HD5, IPB HD6; three inbred lines, namely SMM, SMF, and OMM; and also one check variety (Alisha F1). The results indicated that genotypes had significant effects on all observed quantitative characters, namely leaf width, leaf length, stem diameter, internode length, days to harvest, fruit length, fruit weight, and total soluble solids. The SMM genotype had the highest average fruit weight as well as the other characters, i.e. leaf width, leaf length, stem diameter, and fruit length. There were also IPB HD1 and HD4 having the highest average of flesh thickness and sugar content, respectively. These three genotypes are predicted to have good potential for developing improved hybrid honeydew varieties.
Analysis of the socio-economic impact of renewable energy hybrid electricity utilization for rural community development (case study: Pantai Anyar, Yogyakarta special region, Indonesia)
Authors: Rachmawatie D , Rustiadi E , Fauzi Aad , Juanda Bambang 
Published: December 2019

Abstract
The aim of this research were to: (1) study on socio-economics from Renewable Energy Hybrid Power Plant (PLTH) electricity development for rural communities, (2) find out information related to average households beneficiaries of electricity (pre and post the utilization of electrical energy hybrid electricity at Baru Beach. The research was conducted at Baru Beach, Yogyakarta Special Region on November – December, 2017. The data used were primary and secondary data. The research was conducted by surveying 68 respondents who are direct beneficiaries of hybrid electric energy utilization activities in Baru Beach. The analytical method used in this part of the study is the visualization analysis of the Baru Beach map area for 20072017, analysis of household income, and Paired Sample T-test. The results showed that: (1) based on changes in the map of Pantai Baru area in 2007-2017, changes in road changes, the access and connectivity of this region to other regions have become much better. In the analysis of income obtained, post PLTH was developed at Baru Beach. The income analysis was found that, post PLTH was developed in Baru Beach, there was an increase in the average income in the non-agricultural sector and household income for PLTH electricity beneficiaries, but there was a decrease in the average income value in the agricultural sector, (2) based on Paired Sample T-Test analysis show there is a significant difference the average household income post PLTH developed at Baru Beach with a significance level of 0.041. Thus the results of this research conclude that there is any a socio-economic impact from the utilization of renewable electricity not only for the beneficiaries of electricity in rural communities, but also for the development of local area.
The effectiveness of acetic acid solution agains brown planthopper pest (Nilaparvata lugens Stal.) of ciherang rice (oryza sativa L).
Authors: Hastuti D , Islamy M F , Rusmana  
Published: December 2019

Abstract
One of the main pests that attack rice crops, is brown planthopper (Nilaparvata lugens STAL.). This study aimed to determine the potential of acetic acid solution as an insecticide to control brown planthopper and their effects on rice plant Ciherang variety. The research was conducted in the plastic house at Beberan village, Ciruas, Serang District and the Biotechnology Laboratory of Agriculture Faculty; University of Sultan Ageng Tirtayasa and Greenhouse of Indonesian Rice Research Institut Subang; West Java in April to June 2016. The research arranged out experimentally and used a completely randomized design (CRD), which consisted of 7 treatments and 4 replications. The data obtained were statistically analyzed by analysis of variance and Duncan’s New Multiple Range Test at 5% level. The results showed that acetic acid can control the brown plant hopper, the highest mortality namely at contretation acetic acid solution 30%. Rice plants showed symptoms of poisoning in acetic acid concentration of 25% and 30% and Acetic Acid no effect on high rendering rice crop.