434 research outputs found
Corrosion Inhibition Study of Mild Steel in Acidic Medium by Antibiotic Drugs: a Comparative Study
- A comparison of the inhibiting efficiency of antibiotic drugs (ciprofloxacin, cloxacillin, and amoxicillin) on the corrosion of mild steel in 1 mol·L−1 HCl were studied at room temperature using mass loss measurement. The main reason is probably be due to the formation of protective coverage by the inhibitor as other authors reported previously. Adsorption characteristics of the inhibitor has also been studied using simple equation and it was found that drugs inhibits the corrosion of mild steel by being adsorbed on the surface of mild steel by a physical adsorption mechanism. The adsorption of drugs on the mild steel surface was found to be spontaneous and obey the Langmuir adsorption isotherm model. It was observed that the test drug has a promising inhibitory action in acid medium against corrosion of mild steel. Moreover it was revealed that an inhibition efficiency of 80.1 % can be achieved with 3×10-3M ciprofloxacin drug treatment on mild steel
Corrosion Inhibition Study of Mild Steel in Acidic Medium by Antibiotic Drugs: A Comparative Study
Abstract - A comparison of the inhibiting efficiency of antibiotic drugs (ciprofloxacin, cloxacillin, and amoxicillin) on the corrosion of mild steel in 1 mol·L−1 HCl were studied at room temperature using mass loss measurement. The main reason is probably be due to the formation of protective coverage by the inhibitor as other authors reported previously. Adsorption characteristics of the inhibitor has also been studied using simple equation and it was found that drugs inhibits the corrosion of mild steel by being adsorbed on the surface of mild steel by a physical adsorption mechanism. The adsorption of drugs on the mild steel surface was found to be spontaneous and obey the Langmuir adsorption isotherm model. It was observed that the test drug has a promising inhibitory action in acid medium against corrosion of mild steel. Moreover it was revealed that an inhibition efficiency of 80.1 % can be achieved with 3×10-3M ciprofloxacin drug treatment on mild steel.Keywords: Steel corrosion; Antibiotic drugs; Adsorption isotherm; Inhibition mechanism
Secure and efficient multiparty computation on genomic data
© ACM 2016. Large scale biomedical research projects involve analysis of huge amount of genomic data which is owned by different data owners. The collection and storing of genomic data is sometimes beyond the capability of a sole organization. Genomic data sharing is a feasible solution to overcome this problem. These scenarios can be generalized into the problem of aggregating data distributed among multiple databases and owned by different data owners. However, we should guarantee that an adversary cannot learn anything about the data or the individual contribution of each party towards the final output of the computation. In this paper, we propose a practical solution for secure sharing and computation of genomic data. We adopt the Paillier cryptosystem and the order preserving encryption to securely execute the count query and the ranked query. Experimental results demonstrate that the computation time is realistic enough to make our system adoptable in the real world
Development of a Quadruped Crawling Robot Prototype
Although wheeled robots are commonly
used, it has limited ability to move to any terrains at
ease. They suffer from difficulties when travelling
over uneven and rough terrains. Legged robots have
an advantage over the wheeled robots in that they are
suited for such situations. The implementation of
legged robots normally requires many motors to move
every joint in a robot leg. Additional motor will
increase the construction cost, robot weight, and the
demand for power supply. Moreover, robot
simulation becomes more complex. This research is
related to the design and development of a cost
effective quadruped autonomous robot. The robot can
moves according to a unique pattern using three servo
motors as its actuator in each of its leg. The design of
the robot is firstly made with CAD program and then
the structure of the body and the leg is analyzed in
order to find a correct balance and to make sure the
servo motors are capable to move the robot. A
prototype of the quadruped robot is fabricated and
tested thoroughly. Experimental studies are carried
out to test its stability issues when the robot moves.
The robot is capable of moving forward, backward, turn left and turn right by crawling its way. A microcontroller is used as the brain of the robot assisted by two analog distance sensor for better obstacle sensing. It uses a rechargeable battery as the power supply for the microcontroller. The servo motors on the other hand are powered by another rechargeable battery. At the end of this research, a working prototype has been developed
Multiple urological problems in young age: a case report
Renal stone disease has been regarded as an uncommon problem in
children as compared to adult population. The incidence varies in different parts of
continent. Posterior urethral valve is also regarded as uncommon urological problem
in pediatric population. The incidence is about 1 per 8,000 to 25,000 life births. A
combination of renal calculi, posterior uerthral valve and vesicoureteric reflux in any
given case is extremely rare especially in pediatri
Diversity and occurrence of seaweeds from the south-eastern coast of Bangladesh
1379-1388The present investigation was carried out to prepare a checklist of the seaweeds along with the diversity and distribution pattern in the south-eastern Bangladesh coast. The study was performed in the northern Bay of Bengal during October 2015 to April 2018. From the findings of the present study, it was observed that seaweeds did not occur permanently. Some species were observed only for short periods while other species were recorded for 5-7 months. A total of 117 species were recorded, amongst these 62 species belong to the Rhodophyta group, 31 species belong to the Phaeophyta and 24 species belong to the Chlorophyta group. The species occurrence varied both spatially and temporally. Highest diversity (102 species) of species recorded in Saint Martin Island while the lowest diversity (09 species) was found in Bakkhali, Cox's Bazar coast. This study provides a complete species list to fill up information lacking regarding the ecology of seaweeds in the northern Bay of Bengal coast
Factors influencing and changes in childhood vaccination coverage over time in Bangladesh: a multilevel mixed-effects analysis
Introduction: This study aimed to investigate the associated factors and changes in childhood vaccination coverage over time in Bangladesh.
Methods: Bangladesh’s Demographic and Health Surveys from 2011, 2014, and 2017-18 provided data for this study on vaccination coverage among children aged 12 to 35 months. For three survey periods, multilevel binary logistic regression models were employed.
Results: The overall prevalence (weighted) of full vaccination among children aged 12–35 months were 86.17% in 2011, 85.13% in 2014, and 89.23% in 2017-18. Children from families with high wealth index, mothers with higher education, and over the age of 24 and who sought at least four ANC visits, as well as children from urban areas were more likely to receive full vaccination. Rangpur division had the highest change rate of vaccination coverage from 2011 to 2014 (2.26%), whereas Sylhet division had the highest change rate from 2014 to 2017-18 (34.34%).
Conclusion: To improve immunization coverage for Bangladeshi children, policymakers must integrate vaccine programs, paying special attention to mothers without at least a high school education and families with low wealth index. Increased antenatal care visits may also aid in increasing the immunization coverage of their children
Assessment of genetic diversity of brinjal (Solanum melongena L.) germplasm by RAPD markers
Assessment of genetic diversity in a crop species is prerequisite to its improvement. The use of germplasm with distinct DNA profiles helps to generate genetically diversified breeding populations. The present study was carried out to investigate the genetic diversity in brinjal or eggplant (Solanum melongena L.) using random amplified polymorphic DNA (RAPD). Fifteen brinjal germplasm and three decamer primers were used for random polymorphic DNA assay. A total of 17 fragments were obtained, out of which 12 (70.59%) were polymorphic. Each primer generated 4 to 8 amplified fragments with an average of 5.67 fragments per primer. The highest genetic distance (0.8873) and the lowest genetic identity (0.4118) were observed in Laffa (Elongated) versus Jessore L and Dharola combinations. The lowest genetic distance (0.1525) was observed in several cultivars. The unweighted pair-group method of arithmetic means (UPGMA) dendrogram was constructed from genetic distance and all brinjal cultivars were grouped into five clusters. The genetic diversity of brinjal cultivars reported in this study will be useful when planning future crosses amongst these cultivars
Simulation of the many-body dynamical quantum Hall effect in an optical lattice
We propose an experimental scheme to simulate the many-body dynamical quantum
Hall effect with ultra-cold bosonic atoms in a one-dimensional optical lattice.
We first show that the required model Hamiltonian of a spin-1/2 Heisenberg
chain with an effective magnetic field and tunable parameters can be realized
in this system. For dynamical response to ramping the external fields, the
quantized plateaus emerge in the Berry curvature of the interacting atomic spin
chain as a function of the effective spin-exchange interaction. The
quantization of this response in the parameter space with the
interaction-induced topological transition characterizes the many-body
dynamical quantum Hall effect. Furthermore, we demonstrate that this phenomenon
can be observed in practical cold-atom experiments with numerical simulations.Comment: 8 pages, 3 figures; accepted in Quantum Information Processin
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