Keyphrase extraction forms a critical task in text mining. Keyphrase extraction finds its applications in a host of research areas in Computer Science and Engineering. It enables the discovery of some of the essential terms in a document. The current work undertakes a survey of the existing papers on the topic of keyphrase extraction. The paper covers basics of Keyphrase extraction and its related technologies.

Wire electric discharge machining process is best suited for machining of harder materials. The present study focuses on optimization of operating parameters in wire electric discharge machining of aluminium reinforced with silicon nitride and lithium particles. Aluminium composite was produced through stir casting route with 2% of lithium, 10% of silicon nitride and the combination of 2% lithium and 10% silicon nitride. Experiments were performed based on Taguchi L27 orthogonal array design to optimize the selected input parameters such as pulse on time, pulse off time, current and wire feed for the response parameter material removal rate and surface roughness. ANOVA based regression equation is used for analysing the effect of input variable at each level over selected response variable. Grey relational grade is also performed to optimize multiple performance characteristics. Emphasis is given for material removal rate and surface roughness. Analyzed results reveal that wire feed is the significant input parameter for material removal rate followed by current and pulse on time. Considering the surface finish, pulse on time dominates more than pulse off time and current. Grey relational grade confirms that aluminium composite reinforced with lithium and silicon nitride shows better material removal rate and surface finish.

The launch of Khobar city plan, in the eastern provision of Saudi Arabia in 1947 as the first planned city marked a radical change in the concept of public space making. With the long water frontage area, the water frontage of Al Khobar city became strong magnet for different social interacting and tourist’s events (Eldardiry, 2012). In the time of lock-down due to the COVID 19 pandemic, the use of this space became dangerous and exposing for health hazards to the visitors, therefore the local authority lock-down the all water frontage areas due to the rapid increase of the infected people, the Government has stressed the closed for public parks and green spaces. (Health, 2020) Consequently, the residents lost one of the most important recreational area and a huge green open space in the city, which influenced negatively upon people to take exercise and even get fresh air. Moreover, economic disaster accrued for the business in this water frontage. A comprehensive thought was directed towards the way of dealing with this water frontage as the government steadily gradually releases the lock-down state. The primary target is not allowing the water frontage to be accessible to the public like before the COVID 19 pandemic. Despite the huge investments in the water frontage for long time, protecting people, safety spaces and healthy water frontage by controlling the transmission of the COVID 19 are the priority for the local authority. \nOn the beginning of July, systematically the local authorities started to open spaces with caution and monitoring the social distances. (Health, 2020) In general, they confirmed that it include the recreation spaces and amenities areas such as the water frontage (corniche) and its walkways, promenade, children playing areas, food services, cafes, etc. should be reopened and access but in limited visitors to ensure social distancing. The research discuss the precaution that should be done while reopening the water frontage of Al Khobar City, Saudi Arabia

Now a days, Conventional Power System are evolving towards modern power system called as Smart System, where Hybrid Renewable Energy System (HRES) is connected with storage system with a perfect flow of power and communication. For such system, power management is one of the most critical operation aspects. A microgrid consists of Photovoltaic, Wind as a generating source and Pumped Hydro Storage (PHS) as a storage device in off-peak load period and generating source in peak load period for this study. Nevertheless, the PHS generation output value is low compared to the power of the input pump, which can account for the demand for peak load. The above-considered microgrid (PV-Wind-PHS) is implemented with a power management approach, which is called the Size Optimization Algorithm. The HRES modeling is performed in MATLAB environment, and the results are analysed.