177,961 research outputs found
Seasonal variation of trace elements in water and sediment of the Turag and Balu Rivers, Bangladesh
No full textThe Turag and Balu Rivers are heavily polluted due to the large quantities of untreated municipal sewage and industrial wastewater received from Dhaka City, the capital of Bangladesh. Thus, this study aimed to assess the pollution in trace metal levels in water and sediment over time and space. Trace elements were found in the following descending order: Fe>Ca>Mn>Mg>Zn>Pb>Cu>Cd in Turag River water. Trace elements were found in the following descending order: Fe>Mn>Ca>Mg>Zn> Pb>Cu>Cd in Balu River water. In the Turag River and the Balu River, trace metals were measured in the following descending order in the sediment: Fe>Mn>Pb>Zn>Cu>Ca>Cd>Mg and Fe>Mn>Cu>Zn>Ca> Pb> Mg> Cd, respectively. Metals exhibited no significant differences (p>0.05), except for Ca (p < 0.05) in both the Turag and Balu Rivers. The correlation matrix (CM) demonstrated a sizeable anthropogenic metal influx in the water and sediment of the rivers. Ca, Mg, Cu, and Cd showed significant seasonal fluctuations (P<0.05) in Turag River water, whereas Fe, Mn, Zn, Pb, and Cd showed noteworthy differences (P<0.05) in the Balu River water. Ca vs Mg (r=0.963) revealed a very high linear solid relationship in Turag River water. A solid linear relationship was determined for Ca vs Fe (r=0.981) in Balu River water and for Cd vs Pb (r=0.977). A solid linear relationship was observed between Cd and Pb (r=0.870) in Turag River sediment. The water and sediment quality of the rivers have deteriorated due to anthropogenic sources of industrial, household and irrigation discharges. The present research can be beneficially used for the management and protection plan of the river for environmental monitoring and assessment.Full Tex
The Effect of Irradiation to Sensoric Characteristic, Physic and Microbe in Sie Balu, Acehnese Dried Meat
No full textOne of the Acehnese traditional food preserved by the addition of salt, acid and dried was sie balu. The preservation method may lead to changes in the structure and nutritional content. Sie balu with the addition of vinegar, garlic and ginger can reduce the value of water activity (aW), pH and bacterial counts. This condition affects the physical properties and sensory of sie balu. Irradiation can control pathogenic microorganisms in meat without affecting the physical condition. Low-dose irradiation is able to maintain the desired sensory attributes nutritious food products. This study aims to determine the characteristics of the sensory and physic sie baluthat irradiated with increasing doses and the shelf life of 3-6 weeks. Sie balu was made of 10 kg fresh beef, dried in the sun to dry, vacuum and irradiated at doses of 5, 7 and 9 kGy. Sensory test conducted by taste sie balu by trained panelists and fill out the hedonicform. The physical properties based on pH and aW. The microbe total calculated used Total Plate Count.The results showed that the irradiation dose significantly (P <0.05) affected on microbe total, aroma, color, texture and taste of sie balu. Storage time does not affect the sensory properties. Irradiation dose and storage time significantly (P <0.05) on pH and aWsiebalu. The study concluded that irradiation can improve the physical properties, sensory and microorganisme reductionof sie balu
Effects of nanocrystalline calcium deficient hydroxyapatite incorporation in glass ionomer cements
No full textAbstract not availableSumit Goenka, Rajkamal Balu, T.S. Sampath Kuma
Appropriate Similarity Measures for Author Cocitation Analysis
No full textWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
PENGARUH PROMOSI DAN KUALITAS LAYANAN TERHADAP KEPUTUSAN PEMBELIAN VARIASI MOTOR DI BENGKEL MODIFIKASI DAN PRODUKSI BALU OTO WORK YOGYAKARTA
No full textPenelitian ini bertujuan untuk mengetahui pengaruh (1) Promosi terhadap Keputusan Pembelian Variasi Motor di Bengkel Modifikasi dan Produksi Balu Oto Work Yogyakarta, (2) Kualitas Layanan terhadap Keputusan Pembelian Variasi Motor di Bengkel Modifikasi dan Produksi Balu Oto Work Yogyakarta, dan (3) Promosi dan Kualitas Layanan terhadap Keputusan Pembelian Variasi Motor di Bengkel Modifikasi dan Produksi Balu Oto Work Yogyakarta.
Penelitian ini merupakan penelitian survei dengan menggunakan kuesioner sebagai instrumennya. Populasi yang digunakan dalam penelitian ini adalah konsumen di Bengkel Modifikasi dan Produksi Balu Oto Work Yogyakarta. Sampel yang digunakan adalah konsumen di Bengkel Modifikasi dan Produksi Balu Oto Work Yogyakarta dan diambil sebanyak 105 responden dengan menggunakan metode purposive sampling, yaitu sebuah teknik pemilihan sampel dimana seorang individu memilih sampel berdasarkan penilaian pribadi mengenai beberapa karakteristik yang sesuai dari anggota sampel. Uji validitas instrumen menggunakan Confirmatory Factor Analysis, sedangkan uji reliabilitasnya menggunakan Alpha Cronbach. Teknik analisis yang digunakan adalah analisis regresi berganda. Hasil penelitian menemukan bahwa: (1) Promosi berpengaruh positif dan signifikan terhadap keputusan pembelian dengan nilai regresi 0,147 dan tingkat signifikansinya 0,034. (2) Kualitas layanan berpengaruh positif dan signifikan terhadap keputusan pembelian dengan nilai regresi 0,418 dan tingkat signifikansinya 0,005. (3) Promosi dan kualitas layanan berpengaruh positifsignifikan terhadap keputusan pembelian dengan tingkat signifikansinya 0,000, lebih kecil dari 0,05 (p < 0,05). (4) Besarnya pengaruh promosi dan kualitas layanan terhadap keputusan pembelian (adjusted R²) adalah sebesar 11,7%. Persamaan regresi yang diperoleh adalah Y=1,677+ 0,147X1 + 0,418 X2 +
"Closing the R&D Gap, Evaluating the Sources of R&D Spending"
No full textBoth spending and tax policies have been implemented in the United States with the goal of stimulating private sector research and development (R&D). Karier questions whether current R&D policy, especially the research and experimentation tax credit, can contribute to closing the gap between nondefense expenditures on R&D in the United States and such expenditures in other countries, such as Japan and Germany. He also explores possible changes to our current R&D policy to make it more effective.
Structural evolution of photocrosslinked silk fibroin and silk fibroin-based hybrid hydrogels: A small angle and ultra-small angle scattering investigation
No full textAbstract not availableJasmin L. Whittake r, Rajkamal Balu, Robert Knott, Liliana de Campo, Jitendra P .Matac, Christine Rehm, Anita J. Hill, Naba K .Dutta, Namita Roy Choudhur
Seasonal dynamics of trace metal concentrations and hydrological parameters in the Balu River, Bangladesh
No full textThis study investigates the seasonal dynamics of trace metal concentrations and hydrological parameters in the Balu River, Bangladesh, to inform sustainable water management practices and support efforts to meet environmental standards. Water level, discharge, rainfall, and groundwater data were collected from February to August 2019, alongside sediment samples analyzed for Zn, Pb, Cu, Cr, and Cd concentrations. Statistical analyses, including correlation studies, time series modeling, and Kolmogorov-Smirnov tests, revealed significant seasonal variations. Water levels and discharge rates increased dramatically during the wet season, with upstream levels rising by 862.68% and downstream by 752.92%. Trace metal concentrations showed diverse responses: Cd increased by 554.52%, Zn by 11.86%, while Pb, Cu, and Cr decreased by 44.15%, 5.16%, and 32.72% respectively. Strong correlations were observed between certain metals, particularly in wet periods, with notable relationships between Cr-Cu (r = 0.870) and Zn-Cr (r = 0.742). The integrated analysis of hydrological parameters and metal concentrations, using Gower coefficient and partial correlation analyses, suggests complex interactions between seasonal changes and pollutant dynamics. These findings highlight the need for season-specific water management strategies and more frequent monitoring to better understand and mitigate the environmental impacts of trace metal pollution in the Balu River system. The study contributes valuable insights into the interplay between hydrological conditions and trace metal behavior, essential for developing effective pollution control measures and achieving sustainable river management in Bangladesh
Going Beyond Counting First Authors in Author Co-citation Analysis
No full textThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Rooftop Relay Nodes to Enhance URLLC in UAV-Assisted Cellular Networks
No full textRecently, communication in cellular networks assisted by Unmanned Aerial Vehicles (UAVs) has attracted considerable attention, as it provides wireless connectivity to devices in areas with poor coverage. With a single UAV deployed, it is difficult to achieve Line-of-Sight (LoS) probability and network availability targets for critical Ultra-Reliable Low-Latency Communication (URLLC) applications while meeting cost and system complexity requirements. To harness the advantages of UAVs in these situations, an alternative solution is to deploy a multi-UAV system, exploiting inter-connectivity to maintain uninterrupted communication with a ground transmitter. The idea is to deploy a fixed UAV on the side of a building rooftop, which acts as a relay between the ground transmitter and the flying UAV base station, thus increasing the LoS probability. Notably, a two-hop amplify-and-forward relay can provide significant improvements in the channel capacity, channel gain, and thus overall quality of service. In our study, simulations were carried out in four general environments as specified by ITU-R, namely Suburban, Urban, Dense Urban, and High Rise Urban, based on data collected in Los Angeles, USA. Numerical results demonstrate that two-hop communication via a relay UAV increases LoS probability in all environments, thus improving system reliability and feasibility
- …
