bluuebunny/crossref_metadata_2025_split huggingface dataset:
Characterization of hydrocarbon reservoir at field “B”, South Sumatera by using poisson impedance inversion
Authors: Rosid Mohammad Syamsu , Prasetyo Bagus Dwi , Trivianty Junita , Purba Humbang 
Published: April 2020

The separation process of lithology and fluid reservoir is an important part in the characterization of reservoir. It will explain the physical properties of reservoir rock lithology and fluid content by integrating the geophysics and petrophysical data. This process is difficult to do in the field "B" by using parameters of acoustic impedance and lambda mu rho (LMR), because it still has a fairly high degree of ambiguity. Poisson impedance (PI) has been implemented as a solution to address the problem. In cross-plot between Acoustic Impedance (AI) and Shear Impedance (SI), a rotation of both axes was conducted according to the trend of lithology-fluid to satisfy the equation of PI = AI – cSI. To improve the accuracy of PI calculation, the value of c (optimization factor of rotation) was calculated through the method of TCCA (Target Correlation Coefficient Analysis). The correlation with to be predicted wells data then be done. Analysis of sensitivity parameter was performed on two wells in the field "B". Parameters Zp, Zs and density which obtained from the simultaneous inversion then transformed into PI. PI models clearly showed the separation of rock lithology of hydrocarbon reservoir. Lithology impedance (LI) as a result of the PI-GR correlation was able to separate sand and shale very well. Similarly, the impedance Fluid (FI) as a result of PI-SW correlation was also able to separate the water content in the reservoir with high SW value relative to gas with a low value of SW. Hydrocarbon zone proven at 2360-2400 m. The slicing result of the volumes of Poisson impedance inversion has provided a clear distribution and interpretation of lithology and fluid content reservoir at the field "B" of South Sumatera.
Mechanical and degradation properties of polycaprolactone/ zeolite electrospun membrane
Authors: Iqhwan Rusli Muhammad Syhamiel , Hassan Mohd Izzat , Sultana Naznin , Ismail Ahmad Fauzi 
Published: April 2020

Polycaprolactone (PCL) is one of the synthetic polymers used in biomedical applications. PCL has several advantages including biocompatibility, biodegradability and mechanical flexibility. On the other hand, zeolites are microporous, aluminosilicate minerals commonly used as commercial adsorbents. Electrospinning is a promising technique to produce membranes by applying high voltage electricity. In this research, an electrospinning technique was used to fabricate the electrospun membrane based on PCL and zeolite. In order to produce electrospun membrane, 15% (w/v) of PCL polymer solution was dissolved in acetone and 20% (w/v) zeolite was incorporated into the PCL polymer solution. The diameter range of fiber was 2-6 µm. Zeolite nanoparticles were distributed homogenously into the fibers. EDX spectrum confirmed the presence of zeolite throughout the membrane. Mechanical testing revealed that the bi-layered membrane had better mechanical properties than only PCL and PCL/Zeolite membrane. In-vitro degradation experiment was carried out for 21 days and the membranes were characterized after the experiment. The membrane can be potentially used as microfiltration unit to entrap silver contaminants in drinking water. Apart of that, the membranes are prepared with biodegradable, biocompatible, non-toxic materials which are eco-friendly.
Temperature dependence of power generation of empty fruit bunch (EFB) based microbial fuel cell
Authors: Ghazali Nazlee Faisal , Nik Mahmood Nik Azmi , Abu Bakar Noor Fadzilah , Ibrahim Kamarul Asri’ 
Published: April 2020

Microbial fuel cell has been considered a new emerging technology for renewable and sustainable electricity production. The energy can be extracted from organic waste materials which time independently increase in mass. In the present study, it was demonstrated that lignocellulosic material such as empty fruit bunch (EFB) can be used to produce electricity. Clostridium cellulolyticum and Bacilli E1 were used to activate EFB degradation and electricity generation respectively. It was also demonstrated that the present EFB based MFC was affected in terms of power produced with much higher power was obtained at 37.5 ℃ with power value of 825 ± 3.08 mW/m2 compared to 25 and 50 ℃, which produced 756 ± 1.14 mW/m2 and 345 ± 1.78 mW/m2. At elevated temperature (50 ℃) showed decrease of power density value compared to lower temperature operated MFC, which is believed to be microbial metabolism dependent
Kick Detection Using Downhole Accelerometer Data
Authors: Samuel Robello 
Published: April 2020

Abstract
The high-frequency downhole vibration data include a greater amount of hidden information than the low-frequency surface data. This paper proposes the monitoring of high-frequency acceleration data for early kick detection. The trend of accelerator sensor values is monitored, rather than processed. When the gas, fluid, or oil kick occurs, the fluid influx reduces the viscosity of the fluid in annulus, which causes the degradation of the damping factor. The sensor installed on the drillpipe detects the velocity/acceleration change that results in the damping factor change. This approach includes an analytical model to calculate the effect of the damping ratio on the acceleration calculations. The fluid influx and migration in the wellbore strongly affect the damping factor. The paper presents a method of deconvoluting the sensor values that uses a combination of minimum entropy deconvolution and Teager-Kaiser energy operator to remove the noise, unwanted sensor values, and likelihood of false prediction. It is then proposed to calculate instantaneous jerk and jerk intensity at each depth. The trend of the final intrinsic mode functions (IMF) at each depth is continuously monitored to predict the formation influx, if any. A novel concept of monitoring the incremental IMF and IMF energy at each depth is introduced. This technique is shown to reveal a wealth of information and simplifies the process of monitoring and analyzing the vast amount of available data. The methodology developed is applied to extract the essential information from high-frequency vibration data to make real-time data monitoring straightforward, reliable, and fast.
Experimental Investigation of Vertical Downward Two-Phase Flow in Annulus
Authors: Coutinho Renato P. , Tornisiello Ligia , Waltrich Paulo J. 
Published: April 2020

Abstract
A limited amount of work exists on gas–liquid flow in vertical pipe annulus, and, to the knowledge of the authors, there is no work on the literature to characterize vertical downward two-phase flow in pipe annulus. In the petroleum industry, downward two-phase in annulus is encountered on liquid-assisted gas-lift (LAGL) unloading and production operations. This study presents experimental data for pressure gradient, liquid holdup, and flow regimes for vertical downward two-phase (air and water) flow in pipe annulus. Also, the applicability of two-phase flow models are evaluated. The experimental results show that the liquid holdup is consistently higher for downward flow in annulus than in pipes for the annular flow regime, and these differences are as high as 45%. When the flow regime map for downward flow in annulus is compared with the ones in the literature for flow in pipes, it is observed that the intermittent flow in pipes occurs at lower liquid velocities than flow in annulus. The comparison between experimental data and model results also shows some discrepancy for liquid holdup and pressure gradient. These differences are high for annular and intermittent flow regimes, with errors of 100% for the liquid holdup and 200% for pressure gradient. However, the errors for bubble flow regime are much smaller, generally lower than 20%.
Modeling Ultrasonic Elastic Waves in Fiber-Metal Laminate Structures in Presence of Sources and Defects
Authors: Tai Steffen , Kotobuki Fumika , Wang Lifu , Mal Ajit 
Published: April 2020

Abstract
This paper presents a modeling and simulation method for studying ultrasonic guided wave propagation in hybrid metal-composites, also known as fiber-metal laminates. The objective is to develop an efficient and versatile modeling tool to aid in the design of cost-effective nondestructive evaluation technologies. The global–local method, which combines finite element discretization and Lamb wave modal expansion is used. An extension to the traditional global–local method is made to couple the source problem with the scattering problem to deal with a surface source generating Lamb waves that interact with defects in multilayered structures. This framework is used to study the sensitivity of different excitation frequencies to ply gap defects of various sizes. The coupled model considers the transducer contact conditions and the ultrasonic system response in the Lamb wave excitation, along with the scattering phenomenon caused by the defects. This combined result is used to define the optimal excitation frequency for the strongest transmission or reflection for a given defect size that can be observed in a physical experiment. Such results can be applied to the design of a damage detection scheme in realistic aerospace structures.
District-Level Summertime Air-Conditioning Electricity Consumption and the Sensitivity of Peak Cooling Loads to Urban Weather Conditions in Beijing
Authors: Xu Xiaoyu , González Jorge E. , Miao Shiguang , Shen Shuanghe , Guo Wenli 
Published: April 2020

AbstractUnderstanding how energy use responds to meteorological conditions is essential for anticipation of energy demands, which is of significance to maintain sufficient power supply and to prevent brownouts or blackouts during peak hours. Using the quarter-hourly and district-level electricity data for Beijing, this study calculates the district-varying cooling electric loads due to air-conditioning (AC) systems in five consecutive summers. Results show the occurrence of two major features that are common for summertime cooling loads in most districts, namely, double-peaked diurnal profiles and weekday–weekend fluctuations. With the increasing distance from the city core, the evening peak cooling load around 21:00 local time (LT) becomes more pronounced and comparable with its afternoon counterpart around 15:00 LT. Conversely, the weekday–weekend fluctuation is greatly weakened in suburban and rural districts due to the stable cooling demands on weekdays and weekends. The district-level sensitivity of peak cooling loads to surface meteorological factors is further investigated by linear regression analysis, and results show significant decreases from urban to rural districts. The correlation coefficients between peak cooling loads and heat index that combines air temperature and relative humidity reach up to 0.8–0.9 in most districts. If using air temperature or specific humidity solely, the coefficients of determination with peak cooling loads are roughly 0.1–0.3 smaller, possibly indicating the greater potential of heat index for effectively predicting peak cooling demands in Beijing.
A Hybrid Ray-Tracing Optical Model for Compound Parabolic Concentrators
Authors: Xu Donghao , Qu Ming , Yang Zhiyao 
Published: April 2020

Abstract
Compound parabolic concentrator (CPC), as a hybrid of the stationary and the tracking collectors, can collect both direct beam and diffuse radiation. CPCs are favorable choices for medium-temperature applications for their high thermal efficiency and their cost-effectiveness. Optical models are important tools to predict the solar concentrating capability of the CPC. Despite the numerous, optical models developed in the literature and used for parametric studies of the optical characteristics of CPCs, the angular optical properties of the glass envelope, reflector, and receiver are rarely included. Moreover, most existing optical modeling studies of CPCs did not consider or present the loss associated with the refraction in the glass envelope. This study aims to fill these gaps by developing a comprehensive CPC optical model with the capability of profile generation, hybrid ray-tracing (HRT), surface property simulation, and sky model. The HRT can achieve high accuracy using significantly fewer computation resources compared with Monte Carlo ray-tracing (MCRT) and was validated against tracepro. The new optical model incorporates angular and spectrum dependence of optical properties for refraction and reflection using multilayer thin-film theory. Finally, the proposed HRT model was used to analyze the error associated with neglecting geometric design parameters and angular dependency of optical properties in optical simulation. The results suggest that the gaps between the receiver, glass envelope, and the reflector, the refraction of the glass and angular dependence of transmittance, and absorptance should be included in simulation to avoid considerable errors.
Investigation of Riblet Geometry and Start Locations of Herringbone Riblets on Pressure Losses in a Linear Cascade at Low Reynolds Numbers
Authors: Liu Qiang , Zhong Shan , Li Lin 
Published: April 2020

Abstract
In this paper, the effects of an array of herringbone riblets with different riblet geometry (height and spacing) and start locations on the pressure losses in a cascade of diffuser blades are investigated over a range of low Reynolds numbers (0.50 × 105–1.00 × 105). The herringbone riblets with a given geometry are found to produce a profound modification to the wake structure above certain critical Reynolds numbers. It is also found that within the range of parameters tested an increase in riblet height and riblet spacing results in an onset of significant control effect at a lower Reynolds number, which is accompanied by a slight reduction in zone-averaged loss coefficient and flow turning angle. An upstream shift of the start position of the riblet array along the blades enables the riblets to become effective at a lower Reynolds number at the expense of a reduced loss reduction and flow turning angle. A semi-empirical relationship between the ratio of riblet height to local baseline boundary layer displacement thickness and the critical Reynolds number is established using the present experimental data. A preliminary methodology for designing the herringbone riblets to ensure an effective control of 2D flow separations around the mid-span of diffuser blades over a specified range of Reynolds numbers is also proposed.
Improving Heat Transfer of Plate-Fin Heat Sinks Using Through Rod Configurations
Authors: Abdelmohimen Mostafa A. H. , Algarni Salem , Almutairi Khalid , Ahmed Gulam M. S. , Irshad Kashif , Irfan Sayed A. 
Published: April 2020

Abstract
The performance of the heat sink has been investigated as using rods through its fins. The shear-stress transport k–ω model is selected to carry out this study. Two different flow directions have been studied. Four cases are represented, including the baseline case which has no rods through the fins. Two, four, and six rods are used through the fins. Thermal resistance, pumping power, and Nusselt number have been represented and discussed through this study. The results show that as the number of rods increases, the thermal resistance decreases while the required pumping power increases. The impinging flow direction shows higher performance as compared with the suction flow direction. As the Reynolds number increases, the Nusselt number increases for all studied cases. The optimum case along with the studied range of Reynolds number and number of rods is case-2 (has four rods through fins).
A Robust RCSA-Based Method for the In Situ Measurement of Rotating Tool-Tip Frequency Response Functions
Authors: Ji Yulei , Bi QingZhen , Yu Long , Ren Fei , Wang Yuhan 
Published: April 2020

AbstractMeasuring rotating tool-tip frequency response functions (FRFs) is difficult because of the fluted tip geometry. The methods based on receptance coupling substructure analysis (RCSA) can obtain rotating tool-tip FRFs with a few tests. Existing RCSA-based methods require at least one smooth rod for measurement and then mathematically calculate the desired rotating tool-tip FRFs. However, involving the inverse of the experimentally obtained FRFs matrix, these methods are susceptible to the measurement noise in the rotating structure. In addition, the inconsistency between the holder–tool and holder–rod connections is another uncertainty which impacts accuracy. This paper presents a robust RCSA-based method to obtain rotating tool-tip FRFs. It is found that tool-tip FRFs can be calculated from another point FRFs on the same assembly. Then, one point on the smooth cylindrical shank of the tool is selected for measurement. The measured FRFs, along with those from the theoretical tool model, calculate the rotating tool-tip FRFs. Compared with the previous methods, the proposed one does not require inverting the measured FRFs matrix, inherently avoiding amplification of measurement noise. Since the tool replacement is no longer required, in situ measurement is achieved to ensure the same holder–tool connection throughout the procedure. The proposed method is first validated in a numerical case and then verified experimentally by a commercial hammer and laser vibrometer. Both results show that the method is insensitive to the measurement noise and can obtain rotating tool-tip FRFs with considerable accuracy.
Ergodicity and large deviations in physical systems with stochastic dynamics
Authors: Jack Robert L. 
Published: April 2020

Abstract

In ergodic physical systems, time-averaged quantities converge (for large times) to their ensemble-averaged values. Large deviation theory describes rare events where these time averages differ significantly from the corresponding ensemble averages. It allows estimation of the probabilities of these events, and their mechanisms. This theory has been applied to a range of physical systems, where it has yielded new insights into entropy production, current fluctuations, metastability, transport processes, and glassy behaviour. We review some of these developments, identifying general principles. We discuss a selection of dynamical phase transitions, and we highlight some connections between large-deviation theory and optimal control theory.

Graphical abstract
Schistonchus macrophylla (Nematoda: Aphelenchoididae): an enigmatic taxon from sycones of Ficus section Malvanthera in eastern Australia, with description of a new subspecies
Authors: Davies Kerrie A. , Bartholomaeus Faerlie , Li Dong Mei , Zhao Zeng Qi , Ye Weimin , Giblin-Davis Robin M. 
Published: April 2020

Summary
Over a period of 15 years, Schistonchus was collected from sycones of Ficus subgenus Urostigma section Malvanthera in eastern Australia, and was found to occur widely. Here, Schistonchus macrophylla macrophylla is redescribed from F. macrophylla and F. superba, and a new subspecies, Schistonchus m. lightfooti subsp. n., from F. rubiginosa and F. superba. Schistonchus m. lightfooti subsp. n., is characterised by having a long post-vulval uterine sac (PUS) with thickened walls and a narrowly rounded or pointed distal tip, procorpus which is usually longer than the stylet length, pyriform metacorpus, trapezoid-shaped head capsule, papillae arranged as one large pair adcloacal, a large pair at mid-tail length, and a small pair near the tail tip, no caudal alae, and a spatulate tail tip in females; and was collected from Sydney in New South Wales (NSW) to southern Queensland. Schistonchus m. macrophylla is characterised by having a procorpus shorter than or equal to the stylet length, an ovoid metacorpus, rectangular-shaped head capsule, long PUS with thickened wall only at its distal tip, caudal alae, and papillae arranged as one pair precloacal, one small pair adcloacal, and a large pair at mid-tail length. It was collected in NSW.
The Boule of Baitolethepha (Beit-Nattif): Evidence for Village and Toparchy Administration in Judea
Authors: Ecker Avner , Zissu Boaz 
Published: April 2020

Abstract
A clay seal from the collection of the late professor Dan Barag bears an inscription The Boule of Baitolethepha. The village of Baitolethepha (Beit-Nattif/Pella) was the administrative center of a Toparchy in Judea. This seal seems to prove that central toparchy villages, at least in Roman period Judea, had local councils called boulai and that this type of institution was not exclusive to poleis.
Re-examining Ambrose’s Ep. 24. The Exceptional Case of the Bishop’s Hearing
Authors: Tone Hiroshi 
Published: April 2020

Abstract
Ep. 24 was not simply the record of the dispute and it was entangled with unclear sentences which sometimes confused previous researches. The present study will specify the cause of its confusion and will argue the possibility of the change of the point at issue. As a result, it becomes clear that the case of Ep. 24 was the exceptional one of the bishop’s hearing in which bishop’s judgement was tended to be unfair to one interested party and the result of its dispute was not necessarily dependent upon Ambrose’s authority as a bishop.
Sound across Languages
Authors: Ricci Ronit 
Published: April 2020

Abstract
In his insightful essay, “Silence Across Languages,” (1995) A.L. Becker suggested that every language consists of a particular balance between speech and silence: between what can be expressed in words and what must remain unspoken. One important implication of this fact, he further claimed, is that the different silences between and across languages make translation very difficult, if not utopian. Taking Becker’s essay as its starting point this essay explores the question of silence and sound in translation through a study of interlinear translation. An inter-linear translation in which each line is Arabic is followed by its translation into Malay constitutes a microcosm in which to view the act of translation from up close and in detail. The essay suggests that it is also a space in which silences are “not allowed,” or must be overcome, as these translations do not offer the luxury of adaptation and re-tellings where words, idioms, grammatical and syntactical elements can be glossed over, ignored or remain unheard. An interlinear space forces the scribe, translator, reader and listener to produce and pronounce the sounds of different languages even when they are “incompatible” and thus may overcome the silences, in however small a way, and offer us a paradigm of “sound across languages.”