bluuebunny/crossref_metadata_2025_split huggingface dataset:
Estimating the Chlorophyll-a in the Nha Trang Bay using Landsat-8 OLI data
Authors: Hieu Nguyen Trinh Duc , Tri Nguyen-Quang , Huan Nguyen Huu , Dien Tran Duc , Tran Nguyen Dang Huyen , Lien Nguyen Phuong , Van Tran Thi 
Published: September 2023

Abstract
The pigment chlorophyll-a (Chl-a) is used to evaluate aquatic ecological health. Using remote sensing techniques to estimate this pigment and spatially mapping its distribution becomes essential for measuring and assessing water quality in coastal areas. Nha Trang Bay is famous not only for its scenery but also for its biodiversity values, especially the existence of coral reefs. In this study, Landsat-8 OLI was taken on June 3, 2015, and field measurements of Chl-a at 13 survey sites from June 6-8, 2015, were used to build a local algorithm to monitor the spatio-temporal distribution of Chl-a content in Nha Trang Bay. The ACOLITE processor was employed for the atmospheric modification of Landsat-8 OLI images to obtain atmospherically corrected surface reflectance products. Four types of simple regression models, including linear, exponential, logarithmic, and power models, were used to describe the relationship between the in-situ measurement of Chl-a and remote sensing reflectance of Landsat-8 OLI data. The results of correlation analysis have shown a statistically significant relationship between field measurement of Chl-a concentration and the remote sensing reflectance ratio of Landsat-8 band 3 versus band 2 using an exponential model with a coefficient of determination of 0.88 (p < 0.001) and root mean square error (RMSE) of 0.40 mg/m3. This empirical relationship was applied to map the spatial distribution of Chl-a concentration from 27 cloudless Landsat-8 OLI images from 2013 to 2021. The spatio-temporal distribution of Chl-a indicated that the Chl-a concentration in the Bay has a low value (less than 1 mg/m3). However, this concentration becomes high in the coastal areas (greater than 1 mg/m3) and the Cai and Tac rivers (greater than 2 mg/m3). It is also noted that the content of Chl-a in the rainy season is fairly higher than in the dry season, by an average of 0.68 mg/m3 and 0.53 mg/m3, respectively. This research highlights that Landsat-8 OLI data can be an effective and valuable tool in monitoring Chl-a for coastal areas.
Modelling migration of ammonium ion through landfill bottom barriers subjected to elevated temperature and dry-wet cycles, a case study in southern Hanoi, Vietnam
Authors: Hoai T T , Nhuan M T , Mukunoki T , Dung T T , Linh L T K 
Published: September 2023

Abstract
Geosynthetic clay liners and compacted clay liners are common bottom barriers in landfills. One of the important steps in barrier design is to evaluate the effectiveness of the bottom barrier system in practical conditions based on modelling contaminant migration. This study simulates the migration of ammonium ions through proposed bottom barriers for design under consideration of the southern Hanoi area’s temperature and geohydrology conditions, then evaluates potential impacts on normalized ammonium concentration in groundwater. Proposed bottom barriers include geosynthetic clay liner and compacted clay liner constituting from local soils. The results indicated the reclamation of locally natural soils and geosynthetic clay liner (GCL) placement was approximately 5.2 and 13.4 times more effective in slowing ammonium migration than natural soil, respectively. Compacted clay liner of natural soils exhibited few impacts from elevated temperature. However, being sensitive to an elevated temperature at 50°C, the barrier performance of GCL caused the peak normalized ammonium concentration in groundwater to be 4.2 times higher than normal conditions. Notably, normalized ammonium concentration in groundwater increased 29 times when the geosynthetic clay liner was exposed to 2 dry-wet cycles with ammonium solution. These results provided useful references for designers and engineers to consider in selecting barrier materials in the new landfill.
Use of hydrogeochemical tools to evaluate seawater intrusion: a case study of Upper Pliocene Aquifer in the Ca Mau Peninsula, Vietnam
Authors: Van Le Thi Thuy , Thang Chau Hong 
Published: September 2023

Abstract
Groundwater resources have been withdrawn significantly to meet the demands of agricultural economic development in the Ca Mau Peninsula, Mekong River Delta. As a result, aquifers face the risk of groundwater levels decline and high salinization potential. This study uses the groundwater quality index (GQI) and hydrochemical facies evolution diagram (HFE-D) to assess the hydrochemical characteristics and salinization potential of the Upper Pliocene aquifer (n2
2), which is one of the two most exploited aquifers in the Mekong River Delta. A total of 6 monitoring wells were used to observe groundwater level and water quality from 2017 to 2020. The GQI results ranged from 33.38 to 75.61, indicating that groundwater in Hau Giang and Soc Trang areas is salinized. The spatial distribution results of HFE-D stated that the boundaries of intrusion and freshening have varied in space and time. Specifically, the Upper Pliocene aquifer has been in the process of seawater intrusion. The freshwater area in the Ca Mau has been gradually shrinking in the East Sea area faster than the West Sea area. The displacement speed of the intrusion and freshening boundary varied considerably from 0.04 to 0.67 km/year from 2017 to 2020.
Enhanced performances of Fischer-Tropsch catalysts modified with Re as a promoter and supported on various structured materials
Authors: Giang Nguyen Thi Chau , Luong Nguyen Huu , Thoa Dao Thi Kim , Thuan Huynh Minh , Huan Nguyen Manh 
Published: September 2023

Abstract
This paper presents enhanced performances of Fischer-Tropsch (F-T) catalysts modified with Re as a promoter and supported by various structured materials. The traditional Fe-Co based catalyst was prepared by the simultaneous impregnation and then application of the wash-coating slurry method to coat the catalyst on structured materials, including monolith and metallic foams. Their physicochemical properties of the catalysts were characterized by Brunauer–Emmett–Teller specific surface area, and hydrogen temperature programmed reduction. The reaction was carried out at the temperature of 250°C, the pressure of 20 bar, and GHSV of 3600 mL.g−1.h−1. It has been shown that the efficiency of the F-T synthesis is significantly improved by both Re modification and structured material application to its traditional catalyst. It is interesting that the catalyst modification resulted in both decreasing gas formation and improving C5+ yield. In the presence of Re as the catalytic promoter, CO conversion and C5+ yield increased by 49% and 50%, respectively. Furthermore, the application of structured materials brought further enhancement in the catalyst performance by an additional 23% increase in both CO conversion and C5+ yield. All catalysts have been observed to be stable during 24 hours on stream.
Fabrication of composite aerogels from waste tires and fly ash for thermal and acoustic insulation applications
Authors: Thi Le Cuc , Nguyen Phuc Tran Thien , Nguyen Thao Thi Thu , Truong Thinh Quoc , Nguyen Tu Minh , Huynh Ha Ky Phuong , Nguyen Duy Phuc Thanh , Chau Quyen Ngoc Do , Tran Tuan Du , Goh Xu Yang , Nguyen Son Truong 
Published: September 2023

Abstract
Recently, extensive research has been conducted on composite aerogel materials fabricated using industrial waste sources. These aerogels can not only help solve the most challenging environmental issues brought on by waste streams, but are also materials with excellent properties for thermal and acoustic insulation applications. This study, therefore, focuses on synthesizing composite aerogel using waste tire rubber powder and fly ash attained from power plants in a simple and environmentally friendly manner. The results show that the composite aerogel has a very low density (0.055- 0.079 g/cm3), a porosity of up to 96.57%, low thermal conductivity (0.022-0.039 W/m.K), an adequate noise reduction number (NRC) (0.41 at 250-4000 Hz) and high compressive Young’s modulus (120.5 kPa). These properties show the high potential of the material for thermal and sound insulation of buildings. Especially in the context of utilizing a reasonably priced source of waste material.
Propagation Program of Superior Coconut Varieties in Indonesia to Save Coconut Industries & Farmer’s Livelihood
Authors: Novarianto Hengky 
Published: September 2023

Abstract
Coconut palms are classified into two types, namely Tall and Dwarf, and hybrid and semi-tall types. By breeding activities, such as the selection of coconut germplasm, evaluation and utilization in the coconut breeding program, the IPCRI-IAARD has released 52 varieties of coconut until 2022, consisting of Talls, Dwarfs, Hybrids, and Semi Tall types has been used in coconut development programs. The potential of good local tall seedlings is around 6.0 million seednuts in 37 Provinces of Indonesia. Dwarf coconut type because it is short and the fruit is small, is used for tender coconuts and coconut sugar production. The hybrid coconut varieties are more suitable for private sectors because hybrid palms require high inputs. The tall coconut varieties that are suitable as raw material for the coconut industry include are mostly planted by smallholders. The varieties of Dwarf Pandan Wangi, Dwarf Pandan Manis, Dwarf Entoq Kebumen and Kopyor coconut are very suitable for tender coconut and mixed refreshment drinks. The IPCRI-IAARD has collaborated with several private sectors to supply hybrid coconut seedlings, and help them to establish their own seed garden. Various strategies for providing Tall, Dwarf, Hybrid and Semi-Tall coconut seedlings are expected to increase coconut production and productivity, and can supply raw material to coconut industry. Introduction
Narrowing the Yield Gap of Coconut (Cocos Nucifera L.) Through Integrated Nutrient Management in the Philippines: An On-Farm Experiment Approach
Authors: Crisostomo Speedy D , Cruz Christopher DV Dela , Quilloy Reynaldo B , Reaño Consorcia E 
Published: September 2023

Abstract
Over the years, coconut farmers are facing an inherent problem of low productivity in the Philippines due to the senile palms, poor agronomic practices, and other environmental factors. Fertilizer application is not typically practiced in most coconut plantations resulting in yield gaps of 31 to 87% between farmers’ fields and well-managed farms. We aimed to show the potential of integrated nutrient management (INM) in improving coconut productivity and narrowing the yield gap. In this study, five fertilizer treatments viz. T1 - farmer’s practice, T2 - 100% Philippine Coconut Authority’s recommended fertilizer rate (RFR) at two equal splits, applied semi-annually, T3 - 100% RFR at four equal splits, applied quarterly, T4 - 1/2 RFR at two equal splits, applied semi-annually plus one-time application of MykoVAM™, and T5 - 1/2 RFR at four equal splits, applied quarterly plus one-time application of MykoVAM™ were tested in four provinces to represent the four climate conditions in the Philippines. Each experimental site was carried out in a randomized complete block design with three replications. Nut yields from the on-farm experiments were used to analyze the different yield levels and yield gaps. The actual yields were lower than the attainable yields across all the locations. In terms of nut yield, Northern Samar had the highest yield gap of 68%, while Zamboanga City had the lowest yield gap with 21% difference. The exploitable yield gaps were 8,113, 9,408, 2,649 and 3,203 nuts/ha in Palawan, Northern Samar, Zamboanga City and Davao City, respectively. Results suggested that the indigenous soil nutrient content in the farmer’s field was not sufficient to supply the nutrient requirement of the crop compared to the attainable yield. INM has a potential in improving the nut yield. Thus, nutrient management plays a key role in closing the yield gap and in achieving high productivity.
Effect of glass powder on mechanical properties and durability of modified polystyrene particle concrete
Authors: Yu Zhouping , Yang Weijun , Cai Jiahang 
Published: September 2023

Abstract
In this paper, glass powder (GP) was used as a partial replacement of cement and the effects of different levels of GP replacement on the mechanical and durability properties of modified polystyrene particle concrete were investigated, and the mechanism of action was analysed using x-ray diffraction, scanning electron microscopy and CT techniques. The study results show that GP reduces the early strength of modified polystyrene particle concrete. When the substitution rate of GP is not more than 20%, it can improve the late compressive strength and splitting tensile strength of modified polystyrene granular concrete and enhance the chloride ion permeability and frost resistance. When the substitution rate of GP reaches 30% and above, it is unfavourable to the mechanical properties and durability of modified polystyrene granular concrete.20% is the best substitution rate of GP in modified polystyrene grainy concrete. The thermal conductivity of modified polystyrene particulate concrete tends to decrease and then increase with the increase of the GP substitution rate. The best thermal performance is achieved when the GP substitution rate is 10%. It can be attributed to the fact that the appropriate amount of GP can improve the internal microstructure of the modified polystyrene particle concrete and optimise the pore structure.
Recent developments in sustainable EM wave shielding composites- review
Authors: Prabhu Prashant M , Shivamurthy B , M Sathish Kumar 
Published: September 2023

Abstract
Due to technological advancements, there is tremendous demand for electronic gadgets essential for daily life. These gadgets emit electromagnetic radiation (EMR), harming the health of people in regular contact with these gadgets and creating electromagnetic interference (EMI) in neighboring electronic devices. EMI deteriorates the intended functions of the gadgets. Hence, electronic devices require EM radiation shielding. In this context, synthetic polymer composites become alternative materials to metal due to many advantages. However, synthetic polymer composites are non-degradable, and disposal once after usage is problematic. From this point of view, researchers further proposed biodegradable EM radiation shielding materials. In this regard, the advanced status of research on biodegradable EM radiation shielding authors has been presented in recent research reviews in this article. Mainly, the EM radiation shielding mechanisms and different types of bio-degradable EM radiation shielding materials recently developed by various researchers are reported. The salient features of the research review and the scope for further research are also discussed.
Scalp bacterial species influence SIRT1 and TERT expression in keratinocytes
Authors: Yamada Azusa , Watanabe Kota , Nishi Yuri , Oshiro Mugihito , Katakura Yoshinori , Sakai Kenji , Tashiro Yukihiro 
Published: September 2023

ABSTRACT
Scalp bacteria on the human scalp and scalp hair comprise distinct community structures for sites and individuals. To evaluate their effect on human keratinocyte cellular activity, including that of the hair follicular keratinocytes, the expression of several longevity genes was examined using HaCaT cells. A screening system that uses enhanced green fluorescent protein (EGFP) fluorescence was established to identify scalp bacteria that enhance silent mating type information regulation 2 homolog-1 (SIRT1) promoter activity in transformed HaCaT cells (SIRT1p-EGFP). The results of quantitative polymerase chain reaction revealed that several predominant scalp bacteria enhanced (Cutibacterium acnes and Pseudomonas lini) and repressed (Staphylococcus epidermidis) the expressions of SIRT1 and telomerase reverse transcriptase (TERT) genes in HaCaT cells. These results suggest that the predominant scalp bacteria are related to the health of the scalp and hair, including repair of the damaged scalp and hair growth, by regulating gene expression in keratinocytes.
On-demand low-frequency stimulation for seizure control: efficacy and behavioural implications
Authors: Paschen Enya , Kleis Piret , Vieira Diego M , Heining Katharina , Boehler Christian , Egert Ulrich , Häussler Ute , Haas Carola A 
Published: September 2023

Abstract
Mesial temporal lobe epilepsy (MTLE), the most common form of focal epilepsy in adults, is often refractory to medication and associated with hippocampal sclerosis. Deep brain stimulation represents an alternative treatment option for drug-resistant patients who are ineligible for resective brain surgery. In clinical practice, closed-loop stimulation at high frequencies is applied to interrupt ongoing seizures, yet has (i) a high incidence of false detections; (ii) the drawback of delayed seizure-suppressive intervention; and (iii) limited success in sclerotic tissue. As an alternative, low-frequency stimulation (LFS) has been explored recently in patients with focal epilepsies. In preclinical epilepsy models, hippocampal LFS successfully prevented seizures when applied continuously.
Since it would be advantageous to reduce the stimulation load, we developed a protocol for on-demand LFS. Given the importance of the hippocampus for navigation and memory, we investigated potential consequences of LFS on hippocampal function. To this end, we used the intrahippocampal kainate mouse model, which recapitulates the key features of MTLE, including spontaneous seizure activity and hippocampal sclerosis. Specifically, our online detection algorithm monitored epileptiform activity in hippocampal local field potential recordings and identified short epileptiform bursts preceding focal seizure clusters, triggering hippocampal LFS to stabilize the network state. To probe behavioural performance, we tested the acute influence of LFS on anxiety-like behaviour in the light-dark box test, spatial and non-spatial memory in the object location memory and novel object recognition test, as well as spatial navigation and long-term memory in the Barnes maze.
On-demand LFS was almost as effective as continuous LFS in preventing focal seizure clusters but with a significantly lower stimulation load. When we compared the behavioural performance of chronically epileptic mice to healthy controls, we found that both groups were equally mobile, but epileptic mice displayed an increased anxiety level, altered spatial learning strategy and impaired memory performance. Most importantly, with the application of hippocampal LFS before behavioural training and test sessions, we could rule out deleterious effects on cognition and even show an alleviation of deficits in long-term memory recall in chronically epileptic mice. Taken together, our findings may provide a promising alternative to current therapies, overcoming some of their major limitations, and inspire further investigation of LFS for seizure control in focal epilepsy syndromes.
Timing and Predictors of Loss of Infectivity Among Healthcare Workers With Mild Primary and Recurrent COVID-19: A Prospective Observational Cohort Study
Authors: Dzieciolowska Stefania , Charest Hugues , Roy Tonya , Fafard Judith , Carazo Sara , Levade Ines , Longtin Jean , Parkes Leighanne , Beaulac Sylvie Nancy , Villeneuve Jasmin , Savard Patrice , Corbeil Jacques , De Serres Gaston , Longtin Yves 
Published: September 2023

Abstract

Background
There is a need to understand the duration of infectivity of primary and recurrent coronavirus disease 2019 (COVID-19) and identify predictors of loss of infectivity.

Methods
Prospective observational cohort study with serial viral culture, rapid antigen detection test (RADT) and reverse transcription polymerase chain reaction (RT-PCR) on nasopharyngeal specimens of healthcare workers with COVID-19. The primary outcome was viral culture positivity as indicative of infectivity. Predictors of loss of infectivity were determined using multivariate regression model. The performance of the US Centers for Disease Control and Prevention (CDC) criteria (fever resolution, symptom improvement, and negative RADT) to predict loss of infectivity was also investigated.

Results
In total, 121 participants (91 female [79.3%]; average age, 40 years) were enrolled. Most (n = 107, 88.4%) had received ≥3 severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccine doses, and 20 (16.5%) had COVID-19 previously. Viral culture positivity decreased from 71.9% (87/121) on day 5 of infection to 18.2% (22/121) on day 10. Participants with recurrent COVID-19 had a lower likelihood of infectivity than those with primary COVID-19 at each follow-up (day 5 odds ratio [OR], 0.14; P &lt; .001]; day 7 OR, 0.04; P = .003]) and were all non-infective by day 10 (P = .02). Independent predictors of infectivity included prior COVID-19 (adjusted OR [aOR] on day 5, 0.005; P = .003), an RT-PCR cycle threshold [Ct] value &lt;23 (aOR on day 5, 22.75; P &lt; .001) but not symptom improvement or RADT result.
The CDC criteria would identify 36% (24/67) of all non-infectious individuals on day 7. However, 17% (5/29) of those meeting all the criteria had a positive viral culture.

Conclusions
Infectivity of recurrent COVID-19 is shorter than primary infections. Loss of infectivity algorithms could be optimized.
Spatio-temporal variations of seismic coupling along a transform fault: the western North Anatolian Fault Zone
Authors: Amemoutou Amandine , Martínez-Garzón Patricia , Durand Virginie , Kwiatek Grzegorz , Bohnhoff Marco , Dresen Georg 
Published: September 2023

SUMMARYThe Main Marmara Fault (MMF) forms a major segment of the North Anatolian Fault Zone (NAFZ) in northwestern Türkiye. The MMF represents a seismic gap with currently high seismic hazard and associated risk for the Istanbul metropolitan area. Here we estimate the seismic coupling defined as the ratio of the seismic strain rate to the tectonic strain rate, for the MMF and adjacent NAFZ segments. This ratio indicates the fraction of total strain accumulated with time that is released seismically. We compare the results of seismic strain rates and coupling estimated from earthquakes included in historical and instrumental catalogues, which allows us to identify fault segments that represent a considerable seismic threat during the current seismic cycle. We find that along the main fault traces hosting the large events, seismic strain rates from the historical catalogue are of the same order as the tectonic strain rates. In contrast, coupling estimates based on seismic data from the instrumental catalogue covering also off-fault areas, are up to 100 times smaller, highlighting that most of the seismic energy is released in large earthquakes with recurrence times longer than the time covered by the instrumental catalogue. Within the Sea of Marmara, a significant portion (48%) of shear strain from the instrumental catalogue is currently being accommodated by seismic deformation. Significant variations of the seismic coupling are observed before and after the 1999 M &gt; 7 Izmit earthquake, highlighting the different contribution of aseismic slip over different portions of the seismic cycle. A comparison of the temporal evolution of the 1999 Izmit and Düzce post-seismic deformation with seismic strain rates shows that the largest seismic strain rates coincide with the largest post-seismic deformation.