bluuebunny/crossref_metadata_2025 huggingface dataset:
Decidual NK cells kill Zika virus–infected trophoblasts
Authors: Sen Santara Sumit , Crespo Ângela C. , Mulik Sachin , Ovies Cristian , Boulenouar Selma , Strominger Jack L. , Lieberman Judy
Published: November 2021

Significance

Natural killer cells (NK) defend against viruses. Decidual NK (dNK), which comprise ∼70% of decidual leukocytes during early pregnancy, are poorly cytotoxic but promote placentation. Zika virus (ZIKV) can cause fetal loss and birth defects. A strong dNK-mediated antiviral defense could provide a barrier to placental infections. Here, we show that ZIKV infection transforms immune-tolerated trophoblasts into dNK targets because ZIKV replicates in the endoplasmic reticulum (ER) and causes ER stress, which triggers NK killing. Unlike in the case of other viral infections, dNK release their granules and kill ZIKV-infected trophoblasts. In a trophoblast-like cell line, human primary extravillous trophoblasts, 3D villous explants, andIfnar1−/−pregnant mice, dNK reduce placental and fetal viral loads and protect against fetal loss.
Higher-order Lamb waves with quasi-zero surface displacement components on a GaAs piezoelectric plate
Authors: Hamidullah Muhammad , Élie-Caille Céline , Leblois Thérèse
Published: November 2021

Higher-order Lamb waves with quasi-zero surface displacement components are reported on (100)-cut GaAs propagating along the <110> direction where the total displacement at the surface of the plate is less than 10% of the maximum total displacement. The dispersion curves and the displacement component profiles show the reduction of total displacement at the surface of the plate starting when the phase velocities of the higher-order modes are crossing the shear bulk acoustic wave velocity to the value as low as 5%. Due to the concentration of acoustic energy inside the plate, the reported quasi-zero plate acoustic waves (QZ-PAW) further reduce the radiation of acoustic energy when the plate surface is in contact with liquid. The experimental results validate the occurrence of QZ-PAW with a reduction of viscous damping insertion loss compared to previously reported quasi-longitudinal Lamb waves. The results demonstrate the potential QZ-PAW mode for emerging applications such as dual-mode PAW sensors, PAW devices with integrated sensor and actuator, thin-film and ultra-high frequency PAW sensors in highly viscous liquid media.
B(OH)2-functionalized graphene nanoflakes as a promising nanocarrier for letrozole delivery: a density functional theory study
Authors: Seyedmousavi Malakehsadat , Rouhani Morteza , Mirjafary Zohreh
Published: November 2021

We studied the capability of pristine, Al-doped, and B(OH)2-functionalized graphene nanoflakes for the delivery of the letrozole (LT) anticancer agent using density functional theory calculations. It was shown that the LT/pristine graphene complex includes very weak physical interaction with E
ad = −2.447 kcal mol−1, which is too weak to be applied in drug-delivery purposes. So, the graphene nanoflake was doped by an Al atom, and the calculations demonstrated that the LT adsorption energy was increased significantly (E
ad = −33.571 kcal mol−1). However, the LT release study showed that the adsorption energy did not efficiently change upon protonation in an acidic environment (E
ad = −31.857 kcal mol−1). Finally, the LT adsorption was investigated on B(OH)2-functionalized graphene. The calculations showed that the adsorption energy was −9.607 kcal mol−1, which can be attributed to the possible hydrogen bonding between the LT molecule and the B(OH)2 functional group. The adsorption energy was changed to −1.015 kcal mol−1 during the protonation process. It can be concluded that the protonation of the LT/B(OH)2-functionalized graphene complex in the carcinogenic cells area separates the LT from the nanocarrier. Thus, B(OH)2-functionalized graphene nanoflakes can be considered as a promising nanocarrier candidate for LT delivery.
A novel cooling hole inspection method for turbine blade using 3D reconstruction of stereo vision
Authors: Cheng Yu-qi , Li Wen-long , Jiang Cheng , Wang Gang , Xu Wei , Peng Qing-yu
Published: November 2021

Cooling holes (number 100 ∼ 200, diameter 0.3 ∼ 1.2 mm) are important heat dissipation structures of a turbine blade in aero-engine. Due to the small sizes and similar contours of cooling holes, it is difficult to extract and match their features by traditional stereo reconstruction methods. This paper proposes a novel cooling hole inspection method for turbine blades utilizing 3D reconstruction technique of stereo vision, which combines the stereo vision principle with the invariance of cross-ratio. The feature points of contours are extracted and matched by calculating two intersection points of circular contours and a line through the center points of adjacent cooling holes. Additionally, the 3D points corresponding to the feature points are reconstructed, by which, the diameters of cooling holes can be calculated successfully. Moreover, measurement experiments verify the effectiveness and accuracy of the proposed method. The experimental results show that the average errors of the standard circle ruler and tiny hole sample are within 0.05 mm, which satisfies the inspection requirement of cooling holes.
Evaluation of conventional and deep learning based image harmonization methods in radiomics studies
Authors: Tixier F , Jaouen V , Hognon C , Gallinato O , Colin T , Visvikis D
Published: November 2021

Objective. To evaluate the impact of image harmonization on outcome prediction models using radiomics. Approach. 234 patients from the Brain Tumor Image Segmentation Benchmark (BRATS) dataset with T1 MRI were enrolled in this study. Images were harmonized to a reference image using histogram matching (HHM) and a generative adversarial network (GAN)-based method (HGAN). 88 radiomics features were extracted on HHM, HGAN and original (HNONE) images. Wilcoxon paired test was used to identify features significantly impacted by the harmonization protocol used. Radiomic prediction models were built using feature selection with the Least Absolute Shrinkage and Selection Operator (LASSO) and Kaplan–Meier analysis. Main results. More than 50% of the features (49/88) were statistically modified by the harmonization with HHM and 55 with HGAN (adjusted p-value < 0.05). The contribution of histogram and texture features selected by the LASSO, in comparison to shape features that were not impacted by harmonization, was higher in harmonized datasets (47% for Hnone, 62% for HHM and 71% for HGAN). Both image-based harmonization methods allowed to split patients into two groups with significantly different survival (p<0.05). With the HGAN images, we were also able to build and validate a model using only features impacted by the harmonization (median survivals of 189 versus 437 days, p = 0.006) Significance. Data harmonization in a multi-institutional cohort allows to recover the predictive value of some radiomics features that was lost due to differences in the image properties across centers. In terms of ability to build survival prediction models in the BRATS dataset, the loss of power from impacted histogram and heterogeneity features was compensated by the selection of additional shape features. The harmonization using a GAN-based approach outperformed the histogram matching technique, supporting the interest for the development of new advanced harmonization techniques for radiomic analysis purposes.
Equal-time kinetic equations in a rotational field *
Authors: Chen Shile , Wang Ziyue , Zhuang Pengfei
Published: November 2021

We investigate quantum kinetic theory for a massive fermion system under a rotational field. From the Dirac equation in rotating frame we derive the complete set of kinetic equations for the spin components of the 8- and 7-dimensional Wigner functions. While the particles are no longer on a mass shell in the general case due to the rotation–spin coupling, there are always only two independent components, which can be taken as the number and spin densities. With help from the off-shell constraint we obtain the closed transport equations for the two independent components in the classical limit and at the quantum level. The classical rotation–orbital coupling controls the dynamical evolution of the number density, but the quantum rotation–spin coupling explicitly changes the spin density.
Optimal mean first-passage time of a Brownian searcher with resetting in one and two dimensions: experiments, theory and numerical tests
Authors: Faisant F , Besga B , Petrosyan A , Ciliberto S , Majumdar Satya N
Published: November 2021

We experimentally, numerically and theoretically study the optimal mean time needed by a Brownian particle, freely diffusing either in one or two dimensions, to reach, within a tolerance radius R
tol, a target at a distance L from an initial position in the presence of resetting. The reset position is Gaussian distributed with width σ. We derived and tested two resetting protocols, one with a periodic and one with random (Poissonian) resetting times. We computed and measured the full first-passage probability distribution that displays spectacular spikes immediately after each resetting time for close targets. We study the optimal mean first-passage time as a function of the resetting period/rate for different target distances (values of the ratios b = L/σ) and target size (a = R
tol/L). We find an interesting phase transition at a critical value of b, both in one and two dimensions. The details of the calculations as well as the experimental setup and limitations are discussed.
Research On Dynamic Stability Of Vibrating Disk Worktable
Authors: Yan Shifeng , Ma Yuhang , Zhao Jian , Pang Chaofang , He Yupeng
Published: November 2021

This paper studies the influence of the material quality in the vibrating plate and the relative height difference of the leaf springs on the stability of the worktable, i n order to obtain the disturbance law; firstly, the control variable method is adopted an d the Ansys workbench software is used to determine the quality of different materials on the worktable under static force. Secondly, the deformation of the beam and the cr ossbeam was compared by a simulation test. The results showed that the heavier the m aterial, the greater the deformation of the upper beam and the smaller the deformation of the crossbeam. Finally, the harmonic response method was used to study the effect of the height difference of the leaf spring on the deformation of the beam and the cro ssbeam of the worktable. The results show that the greater the height difference, the s maller the impact on the stability of the workbench.
Design of Distribution Equipment Monitoring System Based on Internet of Things and Multi-Agent
Authors: Li Ruide , Wang Guowei , Dai Wenxia , Zan Xinyu , Zhang Tiefeng
Published: November 2021

In order to improve distribution equipment reliability and emergency repair response speed, a distribution equipment monitoring system based on Internet of things and multi-agent is designed by building a hierarchical model. The system is based on the power Internet of things, which is divided into sensing layer, device layer and data center layer. The sensing layer realizes multi-source data acquisition through sensors and acquisition devices; the device layer deploys edge computing agents to realize device-level monitoring; and the data center layer deploys coordinating agents to realize system-level analysis. The dual-way communication is used to realize data transmission between up layer and down layer. The system has the characteristics of distribution, autonomy and multi-objective interaction, which can meet and adapt to the demand and development trend of intelligent operation and maintenance of distribution equipment.
Multi point monitoring method of prestressed tendon based on distributed sensors
Authors: Sun Wei , Du Jun , Wang Qiang , Sun Li
Published: November 2021

This paper presents a multi-point strain monitoring method based on distributed sensors, which can monitor the multi-point stress of prestressed tendons in concrete. Firstly, the special sensor protection device is installed in the designated position of the component. Then, the sensor is placed in the device and attached to the monitored prestressing tendon. After concrete pouring, the device can form a closed space around the sensor to ensure that the sensor can freely expand and move in a small range when the prestressed tendon is tensioned. The proposed method is applied to the monitoring of the construction period and initial operation period of a large-span spatial structure, and the research results show that the method proposed in this paper can well realize the multi-point monitoring of the prestressed tendon strain in the concrete, and effectively solve the engineering problems; through the analysis of the long-term monitoring data, we can accurately grasp the influence of each construction condition on the structure stress, and clarify the actual stress state and long-term change trend of the structure. The obtained monitoring data play a positive role in guiding the construction of prestressed structure, and the construction safety can be objectively evaluated by analyzing the monitoring data.
Charge sharing investigation in a Timepix3 (TPX3) detector through ion probing
Authors: Leroy C. , Papadatos C. , Usman M. , Boussa M.
Published: November 2021

The phenomenon of charge sharing in pixelated particle
detectors and its relationship to a variety of physical parameters
is investigated using a Timepix3 (TPX3) detector with a
500 μm thick silicon sensor. A probing technique is used
with H, Li, and C ion beams produced at the Tandem Van de Graaff
(VdG) accelerator at the University of Montreal (UdeM), as well as
alpha particles from an 241Am radioactive source, to determine
a direct relationship between particle depth and cluster size.
Additionally, the primacy of a particle's energy on the
determination of its corresponding cluster's size is confirmed.
Development and evaluation of lead(II) iodide-based polycrystalline digital dosimeter for quality assurance in brachytherapy
Authors: Yang S.W. , Han M.J. , Park S.K.
Published: November 2021

Brachytherapy is a cancer treatment that involves intensively irradiating a tumor by placing a sealed radioactive isotope inside the body. Determining the position of the source through accurate quality assurance (QA) is important, because brachytherapy uses radioactive isotope sources with high dose rates. However, in clinical practice, the source position is determined with the naked eye through the use of a ruler, autoradiograph, video monitor, etc., which yields inaccurate results. Therefore, in this study, a lead (II) iodide (PbI2) based polycrystalline digital dosimeter that can measure the relative dose was developed for the QA of the brachytherapy device, and its applicability was evaluated in terms of reproducibility, linearity, percentage interval distance (PID), and angular dependence. Reproducibility evaluation yielded a relative standard deviation value of 1.41%, which satisfied the evaluation criterion of 1.5%. The linearity evaluation yielded an R2 value of 0.9993, which satisfied the evaluation criterion of 0.9990. The PID evaluation revealed that, as the distance from the source increased, the signal decreased according to the inverse-square law. When the PbI2-based digital dosimeter was rotated up to 45°, a difference of up to 13.20% in the angular dependence was observed. Thus, the dosimeter fabricated in this experiment met all the criteria of the aforementioned evaluations. Therefore, it is considered to be highly applicable as a dosimeter for the QA of brachytherapy devices.
The gas flow pattern through small size Resistive Plate Chambers with 2 mm gap
Authors: Pezeshkian Y. , Kiyoumarsioskouei A. , Ahmadpouri M. , Ghorbani G.
Published: November 2021

A prototype of a single-gap glass Resistive Plate Chamber
(RPC) is constructed by the authors. To find the requirements for
better operation of the detector's gas system, we have simulated the
flow of the Argon gas through the detector by using computational
fluid dynamic methods. Simulations show that the pressure inside the
chamber linearly depends on the gas flow rate and the chamber's
output hose length. The simulation results were compatible with
experiments. We have found that the pressure-driven speed of the gas
molecules is two orders of magnitude larger in the inlet and outlet
regions than the blocked corners of a 14 × 14 cm2
chamber, and most likely the difference in speed is higher for
larger detectors and different geometries.
Wave-like global economic ripple response to Hurricane Sandy
Authors: Middelanis Robin , Willner Sven N , Otto Christian , Kuhla Kilian , Quante Lennart , Levermann Anders
Published: November 2021

Tropical cyclones range among the costliest disasters on Earth. Their economic repercussions along the supply and trade network also affect remote economies that are not directly affected. We here simulate possible global repercussions on consumption for the example case of Hurricane Sandy in the US (2012) using the shock-propagation model Acclimate. The modeled shock yields a global three-phase ripple: an initial production demand reduction and associated consumption price decrease, followed by a supply shortage with increasing prices, and finally a recovery phase. Regions with strong trade relations to the US experience strong magnitudes of the ripple. A dominating demand reduction or supply shortage leads to overall consumption gains or losses of a region, respectively. While finding these repercussions in historic data is challenging due to strong volatility of economic interactions, numerical models like ours can help to identify them by approaching the problem from an exploratory angle, isolating the effect of interest. For this, our model simulates the economic interactions of over 7000 regional economic sectors, interlinked through about 1.8 million trade relations. Under global warming, the wave-like structures of the economic response to major hurricanes like the one simulated here are likely to intensify and potentially overlap with other weather extremes.
On intermediate statistics across many-body localization transition
Authors: De Bitan , Sierant Piotr , Zakrzewski Jakub
Published: November 2021

The level statistics in the transition between delocalized and localized phases of many body interacting systems is considered. We recall the joint probability distribution for eigenvalues resulting from the statistical mechanics for energy level dynamics as introduced by Pechukas and Yukawa. The resulting single parameter analytic distribution is probed numerically via Monte Carlo method. The resulting higher order spacing ratios are compared with data coming from different quantum many body systems. It is found that this Pechukas–Yukawa distribution compares favorably with β–Gaussian ensemble—a single parameter model of level statistics proposed recently in the context of disordered many-body systems. Moreover, the Pechukas–Yukawa distribution is also only slightly inferior to the two-parameter β–h ansatz shown earlier to reproduce level statistics of physical systems remarkably well.
Breath biomarkers of total body irradiation in non-human primates
Authors: Phillips Michael , Grun Felix , Schmitt Peter
Published: November 2021

Background. Radiation exposure causes oxidative stress, eliciting production of metabolites that are exhaled in the breath as volatile organic compounds (VOCs). We evaluated breath VOCs as potential biomarkers for use in radiation biodosimetry. Methods. Five anesthetized non-human primates receive total body irradiation (TBI) of three daily fractions of 120 cGy per day for three days, resulting in a cumulative dose of 10.8 Gy. Breath samples were collected prior to irradiation and after each radiation fraction, and analyzed with gas chromatography mass spectrometry. Results. TBI elicited a prompt and statistically significant increase in the abundance of several hundred VOCs in the breath, including some that were increased more than five-fold, with100% sensitivity and 100% specificity for radiation exposure. The most significant breath VOC biomarkers of radiation mainly comprised straight-chain n-alkanes (e.g. hexane), as well as methylated alkanes (e.g. 3-methyl-pentane) and alkane derivatives (e.g. 2-butyl-1-octanol), consistent with metabolic products of oxidative stress. An unidentified breath VOC biomarker increased more than ten-fold following TBI, and rose linearly with the total cumulative dose of radiation (R
2 = 0.92). Conclusions. TBI of non-human primates elicited increased production of breath VOCs consistent with increased oxidative stress. These findings provide a rational basis for further evaluation of breath VOC biomarkers in human radiation biodosimetry.
Feeding preference of herbivorous fish: Family Scaridae
Authors: El Rahimi S A , Hendra E , Isdianto A , Luthfi O M
Published: November 2021

Parrotfish is one of dominant species in Indo-Pacific areas which have 9 genera and 83 species. In ecological perspective, the feeding behaviours of these fish very important, due to control population of algae in coral reef ecosystem. They used their jaw to excavate and scrape alga which living on coral substrata, so sometime resulted on erosion in substrates and coral. The aim of this research to record the diet preference of Scariids fish in NCF Putri Menjangan conservation area, Bali on January to february 2020. Group of Scariids fish was recorded by underwater camera for one minute then the bites scared were calculated manually and photographed. The result of study showed that 10 species from two genera (Chlorurus and Scarus) was dominantly herbivorous fish in this area. The highest number of fish bites at station 1 was obtained from S. qouyi species with a total of 41.27 bpm, while stations 2 and 3 were obtained from S. rivulatus species with a number of 40.96 bpm and 41.59 bpm, respectively. The majority of parrotfish species found chose to forage on dead coral with algae substrates because the water conditions were not optimal for the growth of coral, so many corals died and their skeletons were overgrown by algae.
Cadmium concentration in water and sediment from lake Lau Kawar, North Sumatra
Authors: Malau K M , Ilyas S , Barus T A
Published: November 2021

Heavy metals are easy to bind organic matter and settle to the bottom of the waters and unite with sediments, which is cadmium. Cadmium (Cd) is found from volcanic eruptions, from various human activities, and is carcinogenic. This study aims to analyze the concentration of cadmium in water and sediment in Lake Lau Kawar. Water samples were collected by purposive sampling at three stations using Horizontal Bottle samples. Sediment samples were collected compositely using an Eckmann grab then analyzed by the Atomic Absorption Spectrophotometer method. Descriptive data analysis used comparative quantitative methods, namely comparing the level of cadmium in water and sediment in Lau Kawar Lake with the quality standards set by WHO and IADC/CEDA. The water quality in Lake Lau Kawar is in good condition. The concentration of heavy metal Cd in water and sediment still meets the established water quality standard criteria. The source of Cd contamination in the lake, which comes from the volcanic ash of Mount Sinabung, is only carried in low quantities. The largest source of contamination comes from the activities of residents as fertilizers and pesticides used on agricultural land.
Morphometric characteristics of mungkus fish (Sicyopterus sp.) from several rivers in Bengkulu Province, Indonesia
Authors: Lestari D F , Sipriyadi  , Putra A H
Published: November 2021

Mungkus fish (Sicyopterus sp) is one of the freshwater fish that is caught by many people in Bengkulu Province. The mungkus fish are amphidromous and live in rocky rivers and fast-flowing rivers. This fish has a ventral sucker for sticking to rocks. The aim of this research was to determine the types of mungkus fish that can be found in Bengkulu Province waters based on morphometric characters. The research was conducted on 8 major rivers in 5 districts in Bengkulu Province including Argamakmur, Muko-Muko, Seluma, Manna, and Kaur. Based on the results, showed that the mungkus fish were characterized based on morphometric, there were 3 types of fish including Sicyopterus squamosissimus, Sicyopterus cynocephalus, and Sicyopterus lagocephalus. Mungkus fish found in the northern Bengkulu region tend to be smaller in size, have almost the same color pattern and darker body color than the fish found in the South Bengkulu region. The most common species found in Bengkulu is Sicyopterus squamosissimus. The Sicyopterus lagocephalus species can also only be found in rivers in the South Bengkulu region. The fish morphometric characteristics shows that differences in fish habitat will affect the growth of fish and the existence of living species in nature.
Requirement of Cyanobacteria Synechococcus elongatus for the biomass and lipid production
Authors: Rusydi R , Yakupitiyage A , Pumpuang S , Mellisa S , Rahma A , Ayuzar E
Published: November 2021

Synechococcus elongatus is unicellularCyanobacteria having fast growth and can conduct photosynthesis process in its cells.This research purposed to evaluate the potential of Synechococcus elongatus as an candidate of biodiesel feedstocks by evaluating its biomass and lipid content in appropriate nutrients. The study was conducted at Asian Institute of Technology, Thailand. The Factorial Completely Randomized Design was used as experimental design in this study. The species was grown in BG II medium which was added by different doses of NaNO3 and KHPO4. Cultivation was conducted for seven days for several parameters, namely appropriate dose of nutrients, specific growth rate, biomass, and lipid content. This study resulted the optimal dose of nitrate from NaNO3 and phosphate from KHPO4 for good growth of Synechococcus elongatus which were 289.11 mg/L of NO3- and 22.26 mg/L of HPO4.This species grew well in BG-II medium added optimal nutrients at specific growth rate of 0.34µg/day. The optimal lipid productivity of Synechococcus elongatus was achieved at day 6th of cultivation which its dried biomass was 0.21±0.03 g/L and total lipid was 1.89±0.28%. Based on the results, Synechococcus elongatus cultivated in BG-II medium was potential tobe biodiesel source with its fast growth and lipid content in its cell.
Analysis of distribution patterns and marketing margins of capture fishery products at the Ujong Baroh fishing port, West Aceh district, Indonesia
Authors: Perdana A W , Affan J M , Hasri Q , Miswar E , ‘Akla C M N , Batubara A S
Published: November 2021

The objectives to be achieved in this study are to determine the distribution pattern of capture fishery products at Ujong Baroh Fishing Port and determine an efficient distribution pattern in conducting a marketing system by knowing the margin received. The method used in this study is a survey method with purposive sampling data collection techniques. The data analysis used in this research is descriptive analysis and marketing margin analysis. The descriptive analysis used to describe the distribution pattern in Ujong Baroh Fishing Port. Marketing margin analysis is used to measure the profits of each actor involved in the catch distribution pattern. Results of this study obtained 2 distribution patterns that occur in Ujong Baroh Fishing Port. The first distribution pattern is fishermen to fish collectors to wholesalers to retailers to consumers; second, fishermen to fish collectors to traders to consumers. Both distribution patterns at Ujong Baroh Fishing Port are correct because these patterns get a marketing margin value of < 50% and a fisherman’s profit sharing value of > 50%, where the distribution pattern is classified as efficient. The party who benefits from both distribution patterns is fish collectors because they get a sales profit of 7%.
The potential of the spiny lobster fishery in Aceh waters: A short review
Authors: Damora A , Fadli N , Andriyono S , Suman A
Published: November 2021

The western-southern and northern coastal waters of Aceh are the potential fishing areas of spiny lobster, which faces the Indian Ocean and the Andaman Sea. Fishing gears that are widely used are lobster gill nets and hand-picking with compressors. In Indonesia, seven species of spiny lobsters are caught in these waters, including Panulirus homarus, P. penicillatus, P. versicolor, P. ornatus, P. polyphagus, P. longipes longipes, and P. longipes femoristiga. The habitat for spiny lobsters is spread from coral reefs, rock, sand, and muddy sand. Panulirus homarus is the most frequently caught species in these waters, followed by P. penicillatus and P. longipes. Panulirus homarus is mainly caught during the dry season (southwest wind) and high waves (May to July), where other lobster species experience a significant decrease in the catch. The stock of spiny lobster in Fisheries Management Area (FMA) 572 (including Aceh coastal waters) has been in an overfishing condition since 2008. Maximum sustainable yield (MSY) of spiny lobster in Aceh coastal waters part of Malacca Strait (FMA 571) is 188.60 tons.yr−1 with a total allowable catch (TAC) of 151.10 tons. yr−1. Furthermore, the MSY for Aceh coastal waters part of Indian Ocean is 292.09 tons.yr−1 with a TAC of 233.92 tons.yr−1. Spiny lobster fishing in Aceh coastal waters must ensure its use in the future, both ecologically, socially, and economically.
The change of coral cover in Ujong Pancu waters, Peukan Bada Sub-District, Aceh Besar
Authors: Ulfah M , Muliari M , Azzahara F , Razi N M , Fazillah M R , Agustiar M , Fadli N
Published: November 2021

Coral reef ecosystems are one of the most productive ecosystems on the earth, with large ecological functions. The disruption of coral reef ecosystems has a significant impact on the surrounding biota. This study aims to determine the condition of coral reefs for the last three years in Ujong Pancu waters, Peukan Bada sub-district, Aceh Besar district. This study uses data in 2017, 2018, and 2019 with three observation locations: Lhok Keeutapang, Lhok Mata Ie, and Tuan Island. The method used is Point Intercept Transect (PIT) with a transect length of 20 m with four repetitions. The results showed that the percentage of hard coral cover in the Ujong Pancu waters decreased from the good category (50.31%) in 2017 to moderate (47.81%) in 2019. The percentage with the highest coral cover was at the Lhok Keutapang location at 72, 81% in 2018, while the lowest coral cover at the Tuan Island location was 15.94% in 2017. The composition of the coral genus found also decreased from 12 coral genera (2017) to 9 coral genera (2019).
Current status of the small-scale fisheries and its resources at Peukan Bada coastal area in Aceh Province, Indonesia
Authors: Haridhi H A , Agustina S , Damora A , Fajri I
Published: November 2021

The coastal region around the world is in response to the significant change from the environment impacted by natural and anthropogenic sources. Such significant change could be observed in the coastal region where it had been experienced a natural disaster, climate change, and social-economic shift locally and regionally. The Peukan Bada coastal area in Aceh Province has experienced all of these features; thus, studying this region will give a new perspective and highlight the status of the small-scale fisheries and their governing marine-fisheries resources. In this study, we conducted the Rapid Appraisal of Fisheries Management System (RAFMS) to estimate the fisheries resources and their biological and physical attributes, market pattern, and main coastal problem facing by the community. The study found that the rapid and significant change of the fisheries resources and their biological and physical attributes as a result of a major natural disaster such as 26 December 2004 mega earthquake and tsunami, meanwhile a minor change to the market pattern was found changed in response to market demand, and major coastal problems are dominantly related to the community activities (anthropogenic) rather than resulted from natural event.
Analysis of Pb and Cd Heavy Metal Contents in Green Mussel (Pernaviridis L.) in Alue Naga Waters, Banda Aceh
Authors: Rusydi I , Savira D , Putra D F , Dewiyanti I , Defira C N
Published: November 2021

Alue Naga waters are a coastal area in Banda Aceh city which is thought to have been exploited due to various human activities. The existence human settlements, tourist spots, fishponds, ports, and places for catching marine biota such as oysters, green mussels and fish are some instances to name a few.This research was conducted in July 2020 using simple random sampling method. Samples of green mussels were taken from a container for cultivation and from the bottom of the stream. Sample analysis was done using Atomic Absorption Spectrophotometer (AAS) at the laboratory of Office for Research and Standardization of Aceh Industries. The heavy metals that were analyzed are Lead (Pb) and Cadmium (Cd). The results showed that the content of Pb found in the cultivated green mussels was <0.0001 mg/Kg and Cd with <0.0002 mg/Kg. The metal content of green mussels found at the bottom of the stream was <0.0004 mg/Kg for cadmium and <0.0001 mg/Kg for lead. The intensity of heavy metal content in the seawater atcultivation locations also did not exceed the quality standard for the stream and aquatic biota with <0.0001 mg/L (Pb) and <0.0004 mg/L (Cd). Therefore, it is safe for human consumption.
The operation characteristics of air cathode Microbial Desalination Cell to treat oil refinery wastewater
Authors: Jaroo S S , Jumaah G F , Abbas T R
Published: November 2021

This system [microbial desalination cell (MDC)] is considered an excellent sustainable process to treat wastewater by biological anaerobic oxidation of the organic material by electroactive bacteria, desalinate saltwater, and electrical power generation. In the present work, MDC was used for treating oil refinery wastewater in the anode chamber by anaerobic bacteria. Simultaneously, an air pump was used to provide the oxygen to the cathode chamber as an electron acceptor to generate bioelectricity power. The power density generated by this air cathode MDC with 1KΩ external resistance at the 1st experiment was 71.11 μW/m2. It increased to a peak value of 570.86 μW/m2 at the last experiment. The maximum chemical oxygen demand (COD) removal percent of oily wastewater was 96%. The higher salinity removal rate 150.39 ppm/h with a first salt concentration in a desalinating chamber of 35000 ppm.
Energy Harvesting of Ambient E.M Waves by Employing Different Types of R.F. Antenna
Authors: Radi Ibtesam O. , Mahdi Samira A. , Motlak H. J.
Published: November 2021

Used to operate small electronic devices, such as the cell phones. This work will deal with the electromagnetic signals as a renewable energy sources. An analog circuit will prepare using diodes and a charged capacitance and antenna to convert the energy of ambient E.M. waves (Radio Frequencies RF) to a D.C. voltage. The measurements will be demonstrated using different kinds of antenna. In addition, the ambient RF frequency according to Iraq/Babylon/Hilla city will be collected from the communications tower and measured using a receiver circuit.in this paper used three kinds of antenna, wire antenna, air antenna, dish antenna, Measuring the DC Power. the amount of the DC Power that obtained using a dish antenna is approximate the energy that collected using an air antenna. The amount of the DC. Power could be controlled by the charging time (RC) of the capacities.
The Success of the Construction Industry’s Adoption of the Carbon Assessment Strategy PAS2050
Authors: Smith Holly , Joseph Amoako-Attah , Hashim Raad K. , Hashim Khalid S.
Published: November 2021

PAS2050 was introduced in order to help combat the extremely high levels of emissions that the construction industry emits, as well as the large volume of natural resources they use, through the life cycle of a project. It was developed to create a consistent method of assessing the life cycle of Greenhouse gases as well as a method to increase understanding of where they arise from within a supply chain. This is essential in today’s world as without change, the climate will continue to rise in temperature and contribute negatively to the already dramatic effects of climate change that have already been seen. By implementing PAS2050 the industry aims to allow stakeholders to realise the impacts and encourage movement towards a more sustainable future. This research aims to determine how well the construction industry has adopted the carbon assessment strategy covered by PAS2050 through informed opinions, data and case studies. Using journals and research, alongside a questionnaire which will be distributed to individuals within the industry, an informed decision will be made to determine how well the construction industry has adopted PAS2050. The results found that the industry is having difficulty in adapting to the change at all levels and scopes. The findings of this research show that the industry has only touched the surface and although the larger organisations are leading the charge, enough is not being done by smaller organisations and the supply chain.
Parametric Theoretical Study of Solar Assisted Cooling System Using Lithium Bromide-Water Pair
Authors: Shahhath Ahmed A , Shahad Haroun A K , Mahdi Alaa A
Published: November 2021

In this paper, the effect of parameters of solar absorption system such as evaporator, absorber, condenser, generator temperatures and the mass of the solution on the evaporator cooling load and the coefficient of performance has been explained theoretically. The results show that, increasing of evaporator and condenser temperatures increase the evaporator cooling load, performance coefficient and the Ratio of Circulation while increasing the temperature of condenser and absorber decreases the evaporator cooling load, performance coefficient and the Circulation Ratio. In addition, increasing the solution mass increases the refrigeration power while the performance coefficient and the Circulation Ratio was constant at increasing the solution mass. The reached maximum cooling load was (1.932 kW) at 15 kg solution mass and 100 °C generator temperature, the maximum COP was 0.774 at (10 °C) temperature of evaporator and the peak Circulation Ratio was 0.3066 at (30 °C) temperature of absorber and (100 °C) temperature of generator.
Performance Evaluation of Al-Muamirah Wastewater Treatment Plant
Authors: Al-Wardy Alia Haider , Al-Saadi Riyadh Jasim Mohammed , Alquzweeni Saif Salah
Published: November 2021

Wastewater treatment is a process, which is being done on the wastewater to change its quality to be within the required specifications of water discharged to the surface waterway or water used for different purposes. In the present study, the performance of the oxidation ditch system related to Al-Muamirah wastewater treatment plant in Hilla city, province of Babylon, Iraq, in removing the pollutant of municipal were evaluated. The samples were taken from input wastewater and output treated water of the plant to measure the pollutant parameters. These parameters are the Biochemical Oxygen Demand (BOD5
), Chemical Oxygen Demand (COD), Total Suspended Solids (TSS), Ammonia (NH3
), Phosphorus (P04
), and the quantitative measure of the acidity or basicity (pH). Data were analyzed by using Excel software. The results show that the efficiency of removal of BOD
5, COD, TSS, NH3
and P04
was 91%, 78%, 93%, 69% and 68%, respectively on a monthly basis. Accordingly, it can be recommended that the Al-Muamirah wastewater treatment plant has an acceptable efficiency of wastewater treatment and producing water in accordance with Iraqi environmental standards of water discharged to the surface water or water of other uses.
Updated Moving Forecasting Model of Air Maximum Temperature
Authors: Hashim Khalid , Al-Bugharbee Hussein , Zubaidi Salah L. , Saad Al-Bdairi Nabeel Saleem , Farhan Sabeeh L. , Ethaib Saleem
Published: November 2021

In the current study, a moving forecasting model is used for the purpose of forecasting maximum air temperature. A number of recordings are used for building the AR model and next, to forecasting some temperature values ahead. Then the AR model coefficients are updating due to shifting the training sample by adding new temperature values in order to involve the change in temperature time series behaviour. The current work shows a high performance all over the temperature time series, which considered in the analysis.
Preparation and Optimization Green Gel Casting Technique for Manufacturing Near-Net-Shape Ceramics Using Genetic Algorithm
Authors: Ahmed Al-dujaili Mohammed A. , Al-hydary Imad Ali , Abdalhussien Montaha
Published: November 2021

Gel casting technique is a promising technology that has ability to produce near-net shape ceramics via using toxic and non-ecofriendly agents. The current work aim to develop green gel casting technique using water as a solvent, agar as a gelling agent, and the microwave thermal treatment instead of cross linker. 8mo l% Yttria stabilized zirconia was selected as a case study to produce near-net shape ceramics. The experimental work involved the preparation of Yttria stabilized zirconia nanoparticles via chemical precipitation method. The effect study of agar ratio, Yttria stabilized zirconia solid loading percent on the physical, mechanical, surface properties of the prepared ceramics and selecting of suitable casting conditions. The study has been found that the microwave thermal treatment develops thermally activated cross linking in the agar aqueous solution leading to higher glass transition temperature for agar. The green combination (agar aqueous solution and microwave treatment) can be used as alternative to (monomer, solvent, cross linker) Companion. Also, using the ultrasonic treatment can effectively eliminate needs for dispersants, also the vacuum de-airing treatment. Yttria stabilized zirconia ceramic with high dimensional accuracy, low surface roughness (Ra=2. 81 nm) can be obtained using an agar ratio of (0.4%) and solid loading of (65%). The sample can be moulded with complex shape and the green gel, also the pre-sintered body is machineable. The sintered samples have a porosity of (31%) and compressive strength of (234MPa). Regression analysis and genetic algorithm are showed that the obtained microhardness, compressive strength, and surface roughness are predictable.
Rechargeable Flexible Paper Battery using PAV, PSSPEDOT Polymer
Authors: Abed Thakir H. , Abed Meethaq. M. , Kadem Burak Y. , Jaiad Ahmad T.
Published: November 2021

The main idea of this research is to design a rechargeable paper battery from local cheap and available materials. The practical part is represented by adding Polyvinyl alcohol (PVA) to conductive polymer (PSS PEDOT) with adding different mineral salts for then study the quantum of electrical conductivity and heat influence on electrical conductivity and acidity factors of the Electrolyte solution.The next step was to produce a rechargeable, flexible battery manufactured from regular cellulose paper, sulfone, and ionic solution.The measurements were made using modern laboratory devices to study the electrical properties, conductivity, resistance (Hall Effect), and voltage quantum of the ionic solution. Through the results we obtained, we noticed an increase in the conductivity of the ionic solution when adding mineral salts. The voltage quantum of one battery ranged between 0.3-0.3 volts, also several batteries were connected in series, and the result was 1.8 volts. Manufactured paper batteries can be recharged with a direct current source and recover their efficiency marked up 98-99%.
Experimental and Numerical Study of Thermal Performance for Flat Plate Solar Water Heater in Najaf
Authors: Alghurabe Mohammed J , Al-Shamkhee Dhafer M , Alsahlani Assaad A
Published: November 2021

This work presented the numerical and experimental study of the thermal performance of a flat plate collector (FPC). This study focuses on analyzing the performance of (FPC) in the climatic conditions of Najaf and calculating the thermal energy produced by the collector for domestic use, which reduces the electricity consumption that Iraq is witnessing a severe shortage in its supply. Also, various working fluids (water, oil engine, ethylene glycol-water mixture) were tested to determine the best working fluid that improves the collector’s efficiency. The experiments were performed in Najaf, Iraq (32° 2’ N / 44° 18’ E) on January 9, 2019. The simulation study of the (FPC) is performed by COMSOL Multiphasic 5.3 software. The numerical results were validated with experimental results and there was good convergence between them. The results showed that the average daily efficiency of the solar collector (FPC) was 37.17%, and the highest outlet water temperature of the collector was 57.1Co. The collector achieved a useful cumulative useful heat during the day of about 3.3557 MW, this contributes to reducing the use of electricity and achieving the required economic feasibility of use (FPC). Finally, the engine oil gave better results in improving efficiency compared to other working fluids.
Experimental and Mathematical Research of Convection Heat Transfer for a High Integral Finned Tube Heat Exchanger
Authors: Kassim M. S. , Jaber H. S. , Hashim H. S.
Published: November 2021

This research exhibits an experimental and numerical investigation for the characteristics of heat transfer by utilizing an integral and smooth high finned tube and shows how the integral high fins affect in improving the transfer of heat. In the experimental work, the experimental rig consists of a cold water loop, a hot air loop and the trial part which is a concentric parallel flow double pipe heat exchanger. The first test smooth tube made of brass has external and internal diameter (32 mm) and (22 mm), respectively, the second test section made of the same material has external fins, the third test section possesses internal fins, and the fourth test section has internal and external fins. The dimensions of the fin are (2 mm) in thickness, (2 mm) in height and pitch (2.5 mm) center to center. And, the water flow rates are (6, 8, 10, 12 and 14 L/min). The inlet water to the trial tube was at temperatures (15, 25, 35, and 45oC). The investigational results manifested that the air side heat transfer coefficient of the smooth tube was lesser than the integral high finned tube. The ratio of improvement when using the integral high finned tube was (47.5%, 60.5% and 67.5 %). Numerical simulation was applied on the current heat exchanger to study both the transfer of heat and the field of flow by using ANSYS, FLUENT15 package. Steady state, Newtonian flow, incompressible and three dimensional analyses were assumed. The comparison between experimental work and numerical results elucidated a good agreement.
Environmental ethics analysis on household waste management behaviour
Authors: Zulfa V , Hasanah U , Utami P A
Published: November 2021

This study aims to analyze the effect of environmental ethics knowledge on household waste management behaviour in Jatibening Village, Pondok Gede District, Bekasi City. The research data collection was conducted from October to November 2020. The data was collected using a questionnaire from 127 homemakers. Respondents were selected using a simple random sampling method. The data that has been collected is processed and analyzed using descriptive statistics and inferential statistics, namely simple linear regression. The simple linear regression analysis results indicate that Environmental Ethics Knowledge has a significant positive effect on Household Waste Management Behavior ((3 = 0.215, p <0.05). These results indicate that increasing knowledge about environmental ethics can improve the behaviour of homemakers in managing household waste. Thus, it is hoped that homemakers can increase their knowledge of environmental ethics to improve their behaviour in managing household waste.