The rising cost of construction material is a matter of concern. The reason for increase in cost is high demand of concrete and scarcity of raw material. Hence the concrete technologists must search for some economical alternative to the coarse aggregate. Here we make use of coconut shell as a partial substitute to coarse aggregate.

In this study, M20 grade of concrete was produced by partially replacing Coarse Aggregate by coconut shell. Cubes were cast and their compressive strength and Split tensile strength were evaluated at 7, 28 and 56 days by replacing coarse aggregate by coconut shell at 10%,20%, and 30%. The compressive strength of concrete reduced as the percentage replacement increased. It can be replaced up to 20%. With the increase in the replacement of coconut shell the slump value increases, which lead to increase in workability. Its utilization is cost effective and eco-friendly.

Mobile crowdsensing network is a new way to combine the perceptive data of the Internet of things. This way is efficient and simple. The reason is that everyone carries smart devices, such as mobile phones and watches, with him or her in daily life. And mobile crowdsensing network uses these terminals to obtain data, which saves the cost and does not need to build additional infrastructure. But the process of perceiving data emphasizes the importance of people. With the development and progress of the society, mobile crowdsensing network has also been developed, but also faces many challenges. The number of participants is insufficient, that is, if there are not enough participants to participate in the task, a large amount of data cannot be obtained. Therefore, the incentive problem of participants needs to be solved urgently. Participants' privacy is also in urgent need of protection. The location of participants is easy to be disclosed, and attackers can obtain participants' information through the information perceived by participants. In this way, the accuracy of data cannot be guaranteed. We discussed the motivation of participants from the aspects of participants' privacy protection and energy consumption reduction with participants as the center and platform as the center respectively. Provide valuable reference for relevant personnel.

The study has examined abnormal returns and their plausible determinants for 146 instances of international cross listing done by Indian companies from 1997-2019, where firms have been segregated on the basis of age, size of total assets and industry. No significant results have been obtained for industry classification. On the basis of age, only growth companies have shown positive returns, expansion and mature companies have registered losses for shareholders. With respect to size of assets, large size companies have witnessed greater losses than smaller ones.

The optical limiting properties for solution of Congo red dye in the solvent Dimathyl sulfoxide (DMSO)  is reported. Experiments are performed using the diode laser beam at 532 nm wavelength and 40mW power. Measurements were performed using two continuous wave (CW) laser beams. The effects of concentration of the sample on the optical limiting properties have been investigated. The optical limiting behavior is investigated by measuring the transmission of the samples. A mechanism for the optical limiting is given.