bluuebunny/crossref_metadata_2025 huggingface dataset:
State-to-state rovibrational transition rates for CO2 in the bend mode in collisions with He atoms
Authors: Selim Taha , van der Avoird Ad , Groenenboom Gerrit C.
Published: October 2023

Modeling environments that are not in local thermal equilibrium, such as protoplanetary disks or planetary atmospheres, with molecular spectroscopic data from space telescopes requires knowledge of the rate coefficients of rovibrationally inelastic molecular collisions. Here, we present such rate coefficients in a temperature range from 10 to 500 K for collisions of CO2 with He atoms in which CO2 is (de)excited in the bend mode. They are obtained from numerically exact coupled-channel (CC) calculations as well as from calculations with the less demanding coupled-states approximation (CSA) and the vibrational close-coupling rotational infinite-order sudden (VCC-IOS) method. All of the calculations are based on a newly calculated accurate ab initio four-dimensional CO2–He potential surface including the CO2 bend (ν2) mode. We find that the rovibrationally inelastic collision cross sections and rate coefficients from the CSA and VCC-IOS calculations agree to within 50% with the CC results at the rotational state-to-state level, except for the smaller ones and in the low energy resonance region, and to within 20% for the overall vibrational quenching rates except for temperatures below 50 K where resonances provide a substantial contribution. Our CC quenching rates agree with the most recent experimental data within the error bars. We also compared our results with data from Clary et al. calculated in the 1980s with the CSA [A. J. Banks and D. C. Clary, J. Chem. Phys. 86, 802 (1987)] and VCC-IOS [D. C. Clary, J. Chem. Phys. 78, 4915 (1983)] methods and a simple atom-atom model potential based on ab initio Hartree–Fock calculations and found that their cross sections agree fairly well with ours for collision energies above 500 cm−1, but that the inclusion of long range attractive dispersion interactions is crucial to obtain reliable cross sections at lower energies and rate coefficients at lower temperatures.
Replacing bacitracin zinc antibiotic with symbiotic additive in pullet diet
Authors: Ribeiro A. G. , Rabello C. B. V. , Santos M. J. B. , Nascimento J. C. S. , Silva D. A. , Soares E. S. R. , Manso H. E. C. C. C. , Medeiros-Ventura W. R. L. , Silva Junior R. V. , Siqueira M. A. , Silva S. P. R.
Published: October 2023

Context Currently, since the use of antibiotics as growth promoters in animals has been banned worldwide, it is necessary to use other additives that indorse an adequate balance of the intestinal microbiota, so as to render better results in nutrient acquisition and health of poultry, yielding adequate growth and performance. Aim The study evaluated the effects of dietary supplementation with symbiotics during the grower phase, to replace bacitracin zinc. Methods The experiment included a total of 684 pullets of the Dekalb White strain, from 6 to 15 weeks of age, distributed in a completely randomised design, with five treatments, and eight replications of 18 birds each. The treatments were composed of two base diets, namely one of corn and soybean meal (reference diet, RD), and another of meat and bone meal (MBM), in addition to two more diets based on MBM, one with an addition of 0.05% of bacitracin zinc (Bac Zn), and the other with 0.1% of symbiotic provided to two groups, including one group that had already consumed the symbiotic since the first day of life (starter phase, Symb-S), and the other that started to consume at the beginning of the experiment (grower phase, Symb-G). Performance, blood variables, nutrient metabolisability, weights of organs of the immune and digestive system, and measurement of length (intestine and caecum) were determined. Data were compared using orthogonal contrast. Key results The birds fed with the RD diet presented a worse overall performance and coefficients of apparent metabolisability of dry matter (CAMDM) (6–10 weeks) than did those fed the MBM diet. Birds fed with the Bac Zn diet showed better bodyweight gain (6–15 weeks), coefficients of apparent metabolisability of gross energy (CAMGE) and CAMDM (6–10 weeks) than did those fed the MBM diet. Birds fed with symbiotic diets had better responses in blood biochemistry variables (alkaline phosphatase, total proteins) than did those fed the Bac Zn diet. Conclusion The use of symbiotics since the starter and grower phase can replace the use of Bac Zn, without affecting the biochemical and metabolic responses of the pullets. Implications Symbiotics improved utilisation of diet nutrients, maintenance of physiological homeostasis, and growth of pullets.
Neutral lysophosphatidylcholine mediates α-synuclein-induced synaptic vesicle clustering
Authors: Lai Ying , Zhao Chunyu , Tian Zhiqi , Wang Chuchu , Fan Jiaqi , Hu Xiao , Tu Jia , Li Tihui , Leitz Jeremy , Pfuetzner Richard A. , Liu Zhengtao , Zhang Shengnan , Su Zhaoming , Burré Jacqueline , Li Dan , Südhof Thomas C. , Zhu Zheng-Jiang , Liu Cong , Brunger Axel T. , Diao Jiajie
Published: October 2023

α-synuclein (α-Syn) is a presynaptic protein that is involved in Parkinson’s and other neurodegenerative diseases and binds to negatively charged phospholipids. Previously, we reported that α-Syn clusters synthetic proteoliposomes that mimic synaptic vesicles. This vesicle-clustering activity depends on a specific interaction of α-Syn with anionic phospholipids. Here, we report that α-Syn surprisingly also interacts with the neutral phospholipid lysophosphatidylcholine (lysoPC). Even in the absence of anionic lipids, lysoPC facilitates α-Syn-induced vesicle clustering but has no effect on Ca
2+
-triggered fusion in a single vesicle–vesicle fusion assay. The A30P mutant of α-Syn that causes familial Parkinson disease has a reduced affinity to lysoPC and does not induce vesicle clustering. Taken together, the α-Syn–lysoPC interaction may play a role in α-Syn function.
Improvement in operator safety for low- and middle-income countries: A user-friendly, consistent risk assessment and mitigation process
Authors: Shaw Anugrah , Martin Sabine , Großkopf Claudia , Sanvido Olivier , Wagate Githaiga
Published: October 2023

Ensuring operator safety when handling and applying chemical pesticides is an important aspect of pesticide registration. A risk-based approach to assess if operators can safely apply a pesticide product is usually conducted in countries with a regulatory infrastructure to support the relatively complex process for risk assessment. However, most low- and middle-income countries (LMIC) have limited expertise and/or resources for conducting sophisticated operator risk assessments. The FAO Pesticide Registration Toolkit was developed to support regulators from countries with limited resources to conduct operator risk assessments for national/regional pesticide registration processes. The two operator exposure models referenced in the FAO toolkit for agricultural use, based primarily on studies conducted in Europe and the United States, focus more on mechanical-assisted spray equipment prevalent in those regions. The models for hand-held application technology are based on a rather limited dataset. The applicability of the models for scenarios prevalent in the country and complexity of the risk assessment process are the two key challenges LMIC countries face in using the models referenced in the toolkit.

A global initiative that builds on existing expertise and available studies is underway to develop a global database and operator exposure model for handheld application scenarios prevalent in most LMICs. The goal is to develop a user-friendly risk assessment and mitigation tool to be proposed for inclusion in the FAO toolkit. This article provides a brief overview of risk assessment and examines factors that contribute to the accuracy and consistency of exposure models and risk mitigation measures to ensure operator safety. It also proposes suggestions that can serve as the basis for a user-friendly risk assessment and risk mitigation tool based on a global database for handheld applications
Quantum controlled teleportation with OR-logic-gate-like controllers in noisy environment
Authors: Taufiqi Muhammad , Yuwana Lila , Purwanto Agus , Vinayakam Muniandy Sithi , Latifah Eny , Sukamto Heru , Anang Subagyo Bintoro
Published: October 2023

We evaluate a one-way, bidirectional, and cyclic quantum controlled teleportation with two controllers. We show that the controllers’ agreement mimics the OR logic gate, i.e., the teleportation succeeds with only one of the controllers’ cooperation, and it does not matter which one. This result is generalized to multi-way quantum controlled teleportation with N controllers. The proposed protocols are evaluated by considering a noisy environment in the form of phase-damping noise and amplitude-damping noise and the dependence of fidelity only on the decoherence rate and the initial state’s amplitude parameter were established. It is interesting to note that for the phase-damping noise case, there are states with perfect fidelity (and the entropy equal to zero) even in a noisy environment. We discuss the novelty of the proposed protocols and highlight that they can be useful if the information to be teleported needs an OR-logic-gate-like controllers’ agreement combination, which cannot be done with other existing protocols.
Thomson scattering: one rate to rule them all
Authors: Greene Kylar L. , Cyr-Racine Francis-Yan
Published: October 2023

The enduring tension between local and distant measurements ofH0remains unresolved. It was recently pointed out that cosmic microwave background (CMB) and large-scale structure (LSS) observables are invariant under a uniform rescaling of the gravitational free-fall rates of all species present and the Thomson scattering rate between photons and electrons. We show that a unique variation of the fine-structure constantαand the electron massmecan leverage this scaling transformation to reconcile the CMB and LSS data with a broad spectrum of Hubble constant values, encompassing those inferred from local measurements. Importantly, this study demonstrates that the constraints on the variation of fundamental constants imposed by the specific recombination history are not as stringent as previously assumed. Our work highlights the critical role of the Thomson scattering rate in the existing Hubble tension and offers a distinct avenue of exploration for particle model builders.
Application of New Technologies and Best Operational Practices to Accelerate the Learning Curve in Wells Drilled in the Ayatsil Field, Mexico
Authors: Merchan Nájera Andrés Isaac , Romero Orlando José Urribarri , Lomelí Carlos Alberto García , Perez Mario Maya , Chiw Jorge , Perez Juan Rutilo Rayo
Published: October 2023

Today drilling wells is one of the biggest capital expenditures and is employed starting from exploration, delineation, initial wells for production, and fresh production incorporation when existing wells production have declined. The estimated cost for drilling new wells in Ayatsil field is around 25 MM$, which requires a high level of decision to achieve production goals without exceeding the budget assigned. Therefore, to make the right decision requires an integration of multidisciplinary group of specialists (geologists, geomechanics, reservoir, production and drilling engineers) from well design to execution phases.
Study on Economic and Efficient Completion Design of Tight Gas Reservoir
Authors: Meng-Cai  , An Zhi-bo , Ma Wen-hai , Cheng Jin-xing , Zhang Qian
Published: October 2023

Tight gas reservoirs in Daqing Oilfield has the characteristics of deep burial, high temperature and high pressure, and the produced natural gas generally contains CO2. At present, the production casing and tubing of the tight gas reservoir are completed with 13Cr110 material, which has high cost, but the gas production is low, and it declines very fast, so the economic benefit is poor. In order to reduce cost and increase the efficiency, it is necessary to explore a new well completion method in tight gas reservoir. We study the corrosion law of different materials through laboratory experiments, and finally determine that the production casing adopts the assembly method, material of production tubing next to the production packer is 13Cr, other parts are ordinary carbon steel. The tubing and downhole tools are made of carbon steel, and the casing and tubing annulus are injected with annulus protection fluid for corrosion protection. With the comprehensive analysis, this completion method can meet the requirements of gas well corrosion prevention and production. After 20 years of development, the well construction cost of a single well has been reduced by 79% to 7.553 million RMB. The effective implementation of this design can provide reference for the subsequent development of tight gas reservoir in Daqing Oilfield.
Study of Plasma Arc Underwater Penetration Processes in Steel Structures Covered with Non-conductive Materials
Authors: Liu Peng , Wang Qing-xiang , Xu Yu-Fei , Liu Yong-Hong , Wu Xin-Lei , Ma Chi
Published: October 2023

Recently, plenty of offshore platforms have faced decommissioning. Offshore steel structures covered with rust, mud, and barnacles require suitable cutting methods for their removal. The non-transferred plasma arc is highly efficient in cutting both conductive and non-conductive materials and is expected to play an important role in offshore demolition operations. This work aims to investigate the underwater penetration process of non-transferred plasma arcs on steel structures covered with non-conductive substances. The workpiece consisted of a 5 mm cement layer and a 10 mm steel plate, whose removal mass and hole morphology were recorded at several moments. It was found that the hole of the cement layer was larger than that of the steel plate, while the mass removal rate of the steel plate was much higher than that of the cement layer. The hole in the cement layer gradually changes from an inverted cone to a drum, and the hole in the steel plate is always an inverted cone. A combined heat source model with time variation is proposed based on the experimental results, and a 2D axisymmetric simulation model is developed. The error between the simulated and experimental hole dimensions was within 3.1%, proving that the proposed heat source model can reflect the heat process of the workpiece well.
Application of Integrated Evaluation on Seawater Injection to Improve Injectivity for Carbonate Reservoir in Offshore Oilfield
Authors: Wu Yuanbing , Hu Dandan , He Bing , Hu Songhao
Published: October 2023

Seawater flooding is popular for carbonate reservoirs in offshore oilfields and seawater is sometimes the unique choice of injection water source due to the lack of surface water supply. Seawater is injected into reservoirs to maintain reservoir pressure after water treatment for technically and economically effective field development. Uneven injection and production in B oilfield caused unbalance of pressure distribution and poor injection performance. It is essential to improve the injectivity of single well to a satisfied level through a integrated workflow on the basis of performance analysis, brine compatibility study, core flooding experiment, strategy and solution optimization. In this paper, the injection status has been analyzed and the decisive impacting factors were given including formation properties, stimulation activity, the brines compatibility and pre-treatment of injection water, which play a very important role in injection performance sustainability as the seawater injection continues. Scale modelling was done with formation water, mud filtrate, injection water and stimulation fluid for self-scaling assessment. Mixing experiment of two of the brines of four introduced at either atmospheric or reservoir condition. Core flooding experiment was carried out with formation water and filtered injection water after critical velocity for core flooding is confirmed. Then the injectivity for each wells have been analyzed at different locations of the reservoir with different formation properties, solutions have been subsequently put forward and the improvement on injectivity of injectors before and after the stimulation or even re-stimulation and the effect of cleanup after the stimulation was also compared. It was concluded that injectivity could be enhanced through stimulation and the cleanup after stimulation and the sulfate should be removed or reduced in the process of the pre-treatment of injection water from the remote terminal to ensure desirable water injection and production performance.
Integrated study of structural styles and their suitability for hydrocarbon entrapment, Southern Kirthar Fold Belt, Pakistan
Authors: Halepoto A A , Ahmed S , Agheem M H , Hakro A A A D , Lashari R A , Ahmedani S B
Published: October 2023

Present study is concerned with the interpretation of satellite imagery and 2D seismic profiles to understand the structural styles and petroleum system elements of the Southern Kirthar Fold Belt of Pakistan. Southern Kirthar Fold Belt is the part of regional Himalaya-Suleiman and Kirthar fold belt chain, which is produced in the Cenozoic due to collision and under-thrusting of the Indian Plate with Eurasian Plate. The exploration activities are being carried out in the study area since 19th century and number of gas discoveries are made, but many structures are still barren of hydrocarbons. Present study identifies four structural trends, which are 0, 350,330 and 020 in relation with 010 trending transpressional Ornach-Nal plate boundary. Three different styles of the studied anticlines are identified on the basis of seismic interpretation, which are anticlines cut by both fore-thrusting and back-thrusting reverse faults, anticlines cut by only fore-thrusting reverse faults and anticlines not cut by faults. Sufficient throw along the faults is identified in the seismic profiles, which can provide the juxtaposition trapping as well as recharging medium from the source to trap. Gas fields are discovered from the four out of six studied anticlines irrespective of style.
An XFEM-based CZM Numerical Strategy for Modeling Hydraulic Fracture Propagation under Different Fracturing Schemes
Authors: Zhang Hao-yu , Chen Jun-bin , Wang Yang
Published: October 2023

Segmented and cluster fracturing can improve the efficiency of volume stimulation in shale reservoirs and reduce construction costs. It is important to clarify the propagation characteristics of hydraulic fractures and stress interference under different fracturing techniques to optimize the process of clustered and staged fracturing. For this purpose, we have developed a 2D XFEM-based CZM hydraulic fracturing model. The capability of this model was validated by analytical solutions and then used to study the propagation paths of hydraulic fractures and the characteristics of stress interference under simultaneous fracturing, sequential fracturing, zipper fracturing and multi-cluster fracturing. The results show that in simultaneous fracturing, the middle cluster is compressed by the external position clusters, and the opening width of hydraulic fractures is reduced. In sequential fracturing, the fracture that first initiates create an additional stress field that inhibits the propagation distance of subsequent fractures and the propagation path of hydraulic fractures is also affected in the stress shadow region. Zipper fracturing can effectively alleviate stress interference between multiple fractures, and internal fractures can also propagate a certain distance. In multi-cluster fracturing, the fluid rate into the internal fractures may be limited, and fracture propagation is also limited by stress interference. Therefore, it is necessary to optimize the parameters of clusters to ensure that all clusters can initiate fractures normally. The research results are important for the parameter optimization of clustered and staged fracturing, especially for well factory fracturing mode.
Effect of Gas Injection on the Enhancement of Condensate Recovery in a Gas Condensate Reservoir
Authors: Esmaeili A , Garzón Rojas L E , Crodrigues Nogueira A , Simões Angélica R , Aranha Da Paz S P , Dehghani M , Guerrero C
Published: October 2023

So far, many methods have been used to increase production from gas condensate reservoirs, but in general, all these methods can be placed in two groups:1) Methods of maintaining pressure or preventing pressure drop; 2) Creating chemical changes in reservoir fluids to improve production mechanisms due to capillary forces.Also, many of the methods used have realized both of the above purposes and at the same time while maintaining the reservoir pressure (or preventing pressure drop) also change the chemical physical properties of the reservoir. One of these methods is gas injection. What causes severe changes in the performance of condensate gas reservoirs as soon as the pressure reaches the dew point pressure is the change of the reservoir fluid from a single-phase gas state to a two-phase gas condensate state. In order to accurately study the fluid behavior of one of condensed gas reservoirs, the reservoir fluid was simulated by software, four samples of nitrogen gas, carbon dioxide, methane and separator gas, were injected into the reservoir and then the effect of changing injection rate, injection pressure and injection duration on gas condensate recovery has been investigated by these injection gases.
The need for an environmental strategy in the oil, gas and petrochemical industries
Authors: Garzón Rojas L E , Esmaeili A , Rodrigues Nogueira A C , Dehghani M , Guerrero C
Published: October 2023

The different stages of oil exploration, extraction, and processing, as well as its down-stream industries and the activities of refineries and petrochemical exploitation, leave multiple effects on the environment. For certain, as a result, soil, air, water (including surface and underground), organisms, plants, trees and even humans are affected by these effects. Hence, the fundamental importance of sustainable development and attention to the needs of the future generation, as well as the relevance of preventing the re-duction of environmental quality, encourages and requires oil industry and environmental experts to think of solutions and provide operational-strategic solutions to control and reduce the adverse environmental effects caused by these industries. Indeed, it is necessary to diversify control strategies and include environmental considerations in the planning of the oil, gas, and petrochemical industries, but the current situation is far from ideal. This article first briefly presents some environmental challenges and problems of the oil, gas and petrochemical industries and then describes the need for an environmental strategy to overcome these issues.
Experimental Study of Condensate Vaporization into Bubbles under Different Operating Parameters
Authors: Wang Ce , Lü Yu-ling , Song Chao , Feng Qing-wei , Chen Xiao-xuan , He Li-min
Published: October 2023

Produced water (PW) is a natural by-product of the oil and gas production process, where crude oil is dispersed in the form of micron-sized emulsified droplets in the produced water due to mixing between crude oil and water caused by equipment, piping and valve shear action. Flotation is the main method for treating emulsified oil droplets in oilfield produced water. The conventional flotation technology suffers from a series of problems such as large reflux ratio and poor flotation effect, thus limiting its further application. In this paper, bubbles are prepared by vaporization of low boiling point condensate through theoretical analysis and experimental study. In this paper, the law of bubble generation from condensate solution at different temperatures after decompression and release is investigated. The results demonstrate that the median particle size of gas bubbles generated from condensate is related to the condensate content, mixing pressure, release pressure, and temperature. The median particle size can reach 9.65 μm when mixed at 2.0% condensate content, 0.2 MPa mixing pressure, and 35°C, and released at atmospheric pressure, which is much smaller than the size of gas bubbles generated by dissolved air flotation. The condensate bubbles as alkane congeners are more likely to adhere to the oil droplets in the extracted water, which is conducive to improving the air flotation oil removal efficiency of oily wastewater.
Study on Optimal Design of Constant Current Water Distributor
Authors: Wang Jing-qi , Gao Guang-lei , Tong Yin , Yue Qing-feng , Wang Chao
Published: October 2023

Daqing Field has entered the late stage of ultra-high water cut development. The number of subzones of water injection wells is increasing year by year, and the number of zones of high-efficiency annual survey has exceeded 240,000. The testing capacity has reached a bottleneck, the contradiction among test efficiency, test team and qualified rate of water injection is becoming more and more obvious. The constant flow water distributor can keep the water injection quantity of the applied layer basically unchanged under the frequent fluctuation of water injection pressure, the water injection zone will be changed from repeated adjustment to little adjustment or even no adjustment, greatly reducing the testing workload and improving the testing efficiency. In order to further improve the performance of constant-current water distributor, the stress simulation of valve spool of constant-current water distributor was carried out. Based on the mechanical analysis of the valve core of constant flow distributor, the force acting on the valve core of constant flow distributor is obtained by numerical simulation, and the accuracy of the simulation results is verified by laboratory experiments. According to the requirements of starting pressure difference and spring stiffness of constant current water distributor, the constant current water distributor is optimized and perfected. The experimental results show that the error is less than 5%, which meets the requirements of field application. This study provides a basis for further improving the design of constant-current water distributor. Up to now, 392 wells have been tested with constant-current distributor, the effect of constant-current is good, and the average efficiency of single well is increased by 28.3%.
Analysis of the asymptotical average packet error rate over Rician fading channels
Authors: Wu Xiaohe , Ji Xiang , Yuan Yuan , Li Minyu
Published: October 2023

In the paper, we develop a simple and rather accurate method to analyze and research the average packet error rate (PER) in the high SNR region for the packet transmission system over Rician channels. By introducing the concept of inverse coding gain, the calculation expression of the average PER under the Rician fading channel can be obtained. Numerical calculations and simulations validate our theoretical analysis and approximation.
Two-stage UHV GIL Fault Location Based on Ultrasonic Sensor Network
Authors: Xu You , Li Mengqi , Li Xiujing , Zhang Changhong , Jiang Yi , yin Yu , Li Juan
Published: October 2023

The failure of a long-distance Ultra-high voltage (UHV) Gas Insulated Transmission Line (GIL) during operation will cause great security risks to power transportation. How to locate GIL faults quickly and accurately and further carry out related operation and maintenance work is of great significance to the stable operation of the power grid. Based on this, this paper proposes a two-stage fault location method for UHV GIL based on an ultrasonic sensor network. In this method, ultrasonic sensors are configured in the shell of GIL to form an ultrasonic sensor network and internal faults are located by analyzing the signals collected from the network. The method is divided into two stages: 1) according to the collected signal data, the two sensors closest to the fault point are preliminarily identified, and then the fault point is roughly located, and obtain the data collected by the sensors; 2) we analyze sensor signal data, train and establish a network model based on recurrent neural network RNN for accurate fault location. The verification experiment shows that this method has fast location speed and high location accuracy, and can be effectively applied for quick maintenance, safe operation, and maintenance of GIL.
Temperature and Humidity Wireless Sensor System based on Bluetooth Low Energy and Solar Self-power
Authors: Wang Tong , Hou Di , Feng Long , Zhang Wanli , Rao Simin
Published: October 2023

According to the actual needs of the modern greenhouse, this paper designs a low-energy solar self-powered temperature and humidity wireless sensor system based on Bluetooth low energy. The system uses a Panasonic AM-1801 solar panel and S6AE103A single-chip microcomputer as the energy management module to realize the self-power supply of the system, and uses Si7202-A20-IM1 as the sensor module to collect the temperature and humidity in the environment. The monitoring data are transmitted through the Bluetooth wireless network. The receiving end of the upper computer uses the CY8C5868LTI-LP039 module USB Dongle to receive data. The system realizes the wireless data transmission of the temperature and humidity sensor in the greenhouse environment and the real-time network monitoring of the ambient temperature and humidity through the Bluetooth network. This system can be applied to various greenhouse systems.
Estimation of State of Health and Knee Point Identification in Lithium-ion Batteries Using BES-GRU
Authors: Shi Yongsheng , Hu Yujun , Zhai Xinran
Published: October 2023

Accurately assessing the State of Health (SOH) of batteries and conducting knee point detection is of utmost importance in prolonging their lifespan. However, the generalization ability and robustness of individual methods are limited. To address this, a novel lithium-ion battery SOH estimation model is proposed, incorporating the Bald Eagle Search (BES) optimization algorithm in conjunction with the Gate Recurrent Unit (GRU) neural network. The selection of highly correlated health indicators (HI) with battery SOH is performed using the Pearson correlation coefficient. The BES algorithm is employed to optimize the selection of parameters for GRU networks. The model reliability is verified using the MIT-Stanford lithium-ion battery dataset. The results illustrate that the proposed BES-GRU model effectively predicts the SOH of batteries and identifies knee points, effectively improving the estimation accuracy.
Adsorption of Cu (II) from Cu Standard Solution Using Expanded Perlite
Authors: Pamasengi Abdul Malik , Warmada I Wayan , Wilopo Wahyu
Published: October 2023

The research aimed to determine the ability of expanded perlite to adsorb or remove Cu (II) metal ions in the solution. Furthermore can be used to reduce Cu levels in the aquatic environment caused by industrial and mining waste. Expanded perlite is a product of perlite resulting from heating at temperatures above 1000°C. Perlite is a volcanic product contains high silica content and a lot of water content so when heating occurs will increase the porosity and surface area that can cause adsorption. Expanded perlite sized < 1 mm can be utilized in the remediation process of mining waste because it is effective in the adsorption of ions such as Cu so as not to be in aquatic environtment. Expanded perlites, effectively used in the adsorption process, have a grain size of < 1 mm with a dose of 60 g/l. An experimental batch test method was carried out with the parameters of pH, adsorbent dose, and contact time to determine the ability of expanded perlite to adsorb Cu (II). The optimum pH in the Cu (II) metal ion adsorption process was 7 and reached equilibrium within 240 minutes. The adsorption equilibrium (chemical adsorption due to cation exchange) that can be absorbed by 1 gram of expanded perlite is 6.11 mg Cu (II), while the maximum adsorption capacity (physical adsorption due to the hydroxyl group bonded to silica has a high electronegativity value so that it can attract positively charged ions) that can be absorbed by 1 gram of expanded perlite is 1.47 mg Cu (II).
Empirical Designs of Excavation Method and Support System of the Intake Tunnel of Meninting Dam, West Nusa Tenggara, Indonesia
Authors: Metly Aditya Rasdi , Hendarto
Published: October 2023

The intake tunnel of Meninting Dam has been designed based on RMR but with less detailed drill core evaluation in the tunnel area, which will lead to less accuracy in the design. The objective of this study was to evaluate the tunnel’s excavation method and support system using the latest data based on rock mass classification of RMR, GSI, and Q–system. The investigation was conducted by surface geological mapping and core drilling evaluation. The results showed that the tunnel area consists of pyroclastic breccia intercalated with lapilli stone. Based on the rock mass quality, the tunnel can be divided into two sections: Section A has fair quality rock, and Section B has poor quality rock. Based on the empirical designs, the recommended rock and tunnel excavation in Section A by hammer and top heading bench, and Section B by ripping and top heading bench. The recommended supports in all sections were using a combination of rockbolts, shotcrete, and wire-mesh. Even though the empirical approach is helpful in the preliminary design, a numerical study is needed to verify the empirical design so the recommended excavation and support system can be safely applied.
Empirical Method for Engineering Geological Evaluation of Pelosika Dam Diversion Tunnel Design, Southeast Sulawesi, Indonesia
Authors: Diwani J P , Marliyani G I
Published: October 2023

This paper explains a Pelosika Dam Diversion Tunnel in metamorphic rocks (quartz muscovite phyllite) and aims to find out excavation methods, stand-up time, and support systems for tunnel construction. The purpose of this research is that the development of science in tunnel construction with the characteristic of metamorphic rock will increase. Tunnel location in poort rock mass quality based on previous geology investigations. Based on current geology and engineering geological mapping results, diversion tunnel through poor rock mass of metamorphic rocks (phyllite) which have slightly-highly weathered. We classified rock mass quality by GSI, RMR, and Q-System methods which produce the almost same results (poor rock mass quality). The GSI Chart and Pettifer-Fookes Chart which excavation method has the results of the digging and ripping. RMR value determines the stand-up time last 42-240 minutes after excavation. RMR and Q-System values generate the support system which used rock bolts (length= 1.8 m), shotcrete (thick=10-15 cm), and steel sets (spacing=1,5m) if required. A purpose of combination from the different excavation methods and support systems to complement each other and improve the safety of the tunnel without compromising the cost-effectiveness of construction.
The Effects of Palu-Koro Fault on Predicting Ground Motion for Estimating Liquefaction-Induced Settlement of the Educational Infrastructure Reconstruction Project at the University of Tadulako
Authors: Pasin H R , Ismanti S , Hardiyatmo H C
Published: October 2023

The University of Tadulako suffered significant damage after a tectonic earthquake with a magnitude of M 7.5 with a depth of 20 km that occurred on September 28, 2018. This incident happened because of its location very close to the Palu-Koro fault. The Ministry of Public Works and Public Housing was assigned to reconstruct damaged educational infrastructure there. Seismic hazard analysis was needed to prepare reconstruction development projects and mitigation efforts. Many studies are related to predicting ground motion due to seismic fault activity, one of which is the attenuation NGA West 2 models. This study aims to determine the relationship between fault effects and ground motion to estimate liquefaction-induced settlement at this project. The results show that the relationship between the fault effects and ground motion affects various PGA values. PGA value resulting from the CY14 model was used to estimate settlement because it considers the worst condition aspect, where the most significant settlement occurred at the drill point DP-05 of 10.234 cm. This settlement can happen because the liquefied soil layer at the drill point was quite deep compared to other drill points.
Springs and Tourism Facilities Development in Purwosari, Gunungkidul, Special Region of Yogyakarta, Indonesia
Authors: Soviana N N , Putra D P E , Marliyani G I
Published: October 2023

There have been progressive development and construction of tourism facilities such as hotels and restaurants in Purwosari. Besides the tourism development potentials, Purwosari, also has problems related to surface water sources. The research on the existence of springs in this place is urgent to support water needs for tourism facility development near tourism sites. This research consists of two parts: (1) to observe springs’ existence, water quality, relative water quantity, existence throughout the year, and spring’s relative distance to tourism sites, and (2) to determine suitable springs near tourism sites, related to the development of tourism facilities along the southern coast of Purwosari area. Based on field observation and interviews with five key persons in each village, the results show that 27 springs spread over the research area are unevenly distributed. The quality of spring water is good according to its physical-chemical properties. There are 13 springs with relatively abundant discharge, nine springs are relatively near to tourism sites, and 23 flows the water throughout the year. Springs evaluation with the MCDA method for developing tourism facilities along the waterfront of the Purwosari shows that only 11 springs have the potential to be economical and efficient sources of clean water.
The Effect of Kacang Ratu BW on Ration to Production and Business Income of Layer Chickens
Authors: Rahmandriani S. K. , Sasongko H. , Habibi M. F. , Suwignyo B.
Published: October 2023

The research was conducted to determine the effect of Alfalfa (Medicago sativa L.) substitution for laying hen performance. 108 Hy-Line strains on 26 weeks were put in battery cage and divided randomly into three treatments, (with six replications and every replication consisted six hens). The treatments were used 100% basal diet for control (A0), 99% basal diet + 1% Alfalfa (A1), and 97% basal diet + 3% Alfalfa (A2). Data recorded every day on three periods, with twenty-eight days per period. Feed and drink were given by ad libitum. The data collected every day consist of egg production, egg weight, while laying hen performance counted every week consist of Feed Conversion Ratio (FCR), Hen Day Average (HDA). In addition, the estimation of Income Over Feed Cost (IOFC) counted at the end of this period. Data were analyzed by factorial of classification of variance analysis (ANOVA) between Alfalfa and period. of treatment followed by testing significant means Duncan’s Multiple Range Test (DMRT). According to this research, it can be concluded that Alfalfa can be used for substitution on laying hen’s diet due to decrease the feed cost (increase feed efficiency) moreover without declined its production.
Microzonation study around Lake Toba, North Sumatra, Indonesia based on horizontal – vertical spectral ratio
Authors: Anggono T , Anjali D , Marinda E , Haryanti S , Handayani L , Mukti MM , Lubis AM , Gaol KL , Sudrajat Y , Syuhada S , Saputra FRT , Prasetio AD , Hasib M , Febriani F , Dewi CN , Setyonegoro W
Published: October 2023

Lake Toba, North Sumatra, Indonesia, is one of the biggest calderas in the world. The area is also prone to earthquake damage because of the tectonic activity due to its location in the subduction zone of Indo-Australian and Eurasian Plates. In recent years, Lake Toba has become one of the most attractive tourist destinations in Indonesia. Hence, the Indonesian government has been considering infrastructure development in this region. The region vulnerability cause by soil amplification due to the earthquake activity can be quantitatively investigated. We carried out a microzonation analysis around Lake Toba using Horizontal-Vertical (H/V) Spectral Ratio method. A total of about 30 short-period seismometers around Lake Toba were used for the analysis. We estimated several parameters that may define some soil characteristics, such as H/V peak amplitudes, peak frequencies, average shear wave velocity of 30 m depth (Vs30), and vulnerability index (Kg). Spatial distribution of peak frequencies and Vs30 suggest that the region may fall into sites SC and SD showing characteristics of dense to stiff soil. We also observed areas with a high vulnerability index (Kg > 20), which may indicate the high possibility of soil vulnerability due to strong earthquakes. The findings may provide preliminary results or sources for future geophysical, geological, and geotechnical analysis for disaster risk reduction in this high-risk region.
Symptoms of Gentrification in the Yogyakarta Urban Area and Its Implications for the Sustainability of Yogyakarta City
Authors: Nugrahaningtyas F T , Marwasta D
Published: October 2023

One of the most common symptoms in developing country cities today is gentrification. Gentrification is the recessive of residence of economically weak groups by strong investors. This study tries to examine gentrification in Yogyakarta urban area and its implications for the sustainability of Yogyakarta city. The spatial approach is used in this study considering that space is an integral part of a city which is a place for various urban activities and functions. In general, this research aims to: (1) Identifying the symptoms of gentrification in the Yogyakarta Urban Area; and (2) Assessing the implications of gentrification on urban sustainability. This research is a study in the field of geography with the main focus on the spatial approach. The data analysis framework in this study consisted of two kinds, namely spatial analysis and descriptive statistical analysis. The results showed that (1) the symptoms of gentrification in the Yogyakarta urban area had occurred in several places, and (2) the gentrification that occurred had implications for the sustainability of the city, both positive and negative.
Manganese prospecting using time domain induced polarisation (TDIP), case study: Karangnunggal district, Tasikmalaya regency
Authors: Antosia R M , Yolandika R , Parnadi W W
Published: October 2023

Indonesia has good manganese potential, but its utilization has not been optimal. It has been unable to meet domestic needs because of the low production level. Thus, it needs to conduct more exploration activities. Karangnunggal district, Tasikmalaya regency, is one of the manganese minerals located. The method to prospect the manganese distribution in the area was applying a geophysical approach. The measurement employed the time domain induced polarisation (TDIP) method in 17 lines. In this study, the process deployed the Wenner array. Each line has a length of about 117.5 m with an electrode spacing of 2.5 m. The outcome shows that a manganese mineral has a chargeability of more than 5 ms. Based on the 3D visualization, it can be identified that most deposits spread to the south and the east while partially located in the north and the west of the study area. The 3D chargeability modeling generates the estimating manganese volume of about 2.4 million cubic meters.
The effect of disaster knowledge on community preparedness in dealing with liquefaction disaster in Palu City, Central Sulawesi
Authors: Sekartaji D A , Mei E T W
Published: October 2023

Liquefaction occurred in Palu City on September 28, 2018 caused hundreds of casualties and thousands of buildings were damaged. The event became the Aha! Moment for many people that liquefaction disaster is real and people were not aware of the threat despite the mapping of liquefaction susceptibility in Palu had been published by Geological Agency in 2012. This study aims to analyse disaster knowledge and preparedness, as well as its influence on community preparedness in facing liquefaction. Quantitative method is used in this research by using questionnaire as primary data source to collect information regarding two variables namely disaster knowledge and community preparedness. Respondents were achieved by drawing the samples by accidental sampling. Quantitative descriptive analysis and Simple Linear Regression analysis were used to answer the objectives of this study. The results showed that disaster knowledge is in the high category generally, while community preparedness is in the medium category. Disaster knowledge has a positive and significant effect on disaster preparedness of the Palu City community in facing the threat of liquefaction, which is 43.8% with a regression coefficient of 5.013. This indicates that if disaster knowledge is higher, community preparedness will increase as well.
Composition of lost and discarded fishing gear (ghost fishing) in the blue swimming crab fishery in Rembang, Central Java
Authors: Satria M B , Wicaksono R Z , Utomo R P
Published: October 2023

Ghost fishing is the ability of fishing gear to catch fish continuously for a certain period when the fishing gear has been lost. Some passive fishing gear will most likely be lost due to material degradation of gear components and other factors. Therefore, it is necessary to study the composition of fishing gear left in the sea to find out the cause of ghost fishing. The study aimed to determine the composition of materials from fishing gear left in the waters of the Rembang Sea. This is done by collecting fishing gear found by fishermen and then weighing per material to get the composition of the fishing gear. As many as 86% are metal, and 14% are plastic. This shows that metal and plastic materials are difficult to decompose in marine waters, so fishermen still find these fishing gear in Rembang waters. This also shows that metal is the dominant constituent of the fishing gear used by fishermen in Rembang waters. This research provides information about what fishing gear materials are likely to be a source of ghost fishing so that it can be a suggestion for using fishing gear.
Contact-electrification enabled water-resistant triboelectric nanogenerators as demonstrator educational appliances
Authors: Vivekananthan Venkateswaran , Chandrasekhar Arunkumar , Dudem Bhaskar , Khandelwal Gaurav , P Silva S Ravi , Kim Sang-Jae
Published: October 2023

Triboelectric nanogenerators (TENG) work on the principle of tribo and contact electrification, which is a common phenomenon observed in daily life. TENGs are moving closer to commercialization, particularly for small scale energy harvesting and self-powered sensing. The toys and games industry has attracted a large audience recently with the introduction of digital toys. In this paper we embedded TENGs to power up a toy and operate during its specific application. We have modified two potential electronic demonstrator applications using TENG for lobster toy (LT-TENG) and stress ball (SB-TENG) device. The LT-TENG device generates a maximum electrical response of 60 V/2 µA, with a power of 55 µW and power density of 0.065 µW m−2 at a load resistance value of 10 MΩ. Similarly, the SB-TENG device made of aluminum and PDMS as the triboelectric layers generates a maximum electrical output response of 800 V and 4 µA peak to peak current with an instantaneous power of 6 mW and a power density of 3.5 mW m−2 respectively at a load resistance of 10 MΩ. In addition, the layers of the TENGs are packed with polyethylene to maintain the performance of the nanogenerator under harsh environmental conditions, especially with humid environments. The water resistance studies proved that the packed SB-TENG is impervious to water. The LT-TENG device is accompanied by four LEDs, and the device lights up upon actuating the handle. The SB is connected with the measuring instrument to record the quantity of force at which the SB is pressed. The adopted approach paves the way to convert these traditional toys into battery-free electronic designs and its commercialization.