The leakage of natural gas pipeline brings threat to people’s safety and social stability. Gas diffusion plays an important role in detecting pipeline leakage. Diffusion model of overhead natural gas pipeline leakage was established, and diffusion process was analyzed numerically with different leakage locations and different leakage velocities. The results show that the diffusion concentration of natural gas on the ground is high when the leaking location is on the bottom. However, the diffusion concentration of natural gas on the ground is low when the leaking location is on the top. Distribution of natural gas concentration is conical when pipeline is leaking at high speed. When pipeline is leaking at medium speed, there are great differences of natural gas concentration in different heights of vertical direction. Natural gas diffusion concentration is smaller when pipeline is leaking at low speed, and there is obvious backflow around the jet beam.

Let G= (V, E) be molecular graph in which the set of vertices and the set of edges of the graph correspond to the atoms of the molecule and chemical bonds, respectively. The Ediz eccentric connectivity index Eξc (G) of G is defined as   ( ) ( ) ( ) v V G v S v  , where S (v) is the sum of degrees of all vertices adjacent to vertex v, and  v is the eccentricity of v. In this paper, we compute the Ediz eccentric connectivity index of Polycyclic Aromatic Hydrocarbons PAHk.

Ground motion has a strong randomness because of the limitation of the number of strong earthquake records and mathematical difficulties. In general, by the method of establishing stochastic process model, one can study the influence of spatial correlation of ground motion on seismic response of structures. However, more researches focus on the random process model of acceleration. According to the acceleration stochastic process model, the frequency domain model and time domain model are selected to study the composition of ground motion at each point of the ground pipeline, and further consider spatial correlation of ground motion to give the influence of traveling wave effect, coherence effect and local site effect on the ground pipeline. The results show that it may be unsafe without consideration of the spatial coherence of seismic ground motions, and different coherence function models lead to different results. It is also suggested that the spatial coherence of seismic ground motions should be considered, and the coherence function models should be chosen cautiously

In the view point of human rights, the importance of the cyberspace is shooting up day by day as the conventional media hides many information that pertain into the violation of human rights. When the media is either afraid of the after-effects, or fond of the violators, the cyber activists take out the sword of bravery. This paper analyses the reflections of social networks, blogs and sites such as WikiLeaks in the age of mass surveillance and attacks on privacy. The pros and cons of the “Information Panopticon” and the arguments on the ethics of hacking are studied. Contributions of persons such as Julian Assange and Aaron Swartz in the fight for internet freedom are studied. The politics and poetics of hacking as a tool in this freedom fight are brought to the focus. A case study has been conducted in the light of democratic uprisings in the Middle East, on the correlation between social media and political change. The ethics and practices of Hacking in the present world, where powerful countries are masking the information about their attack on the rights of people as well as that of other countries, is studied in this paper. With special reference to “Nilppu Samaram” in Kerala, the power of social media as an agent of change and as an element of the fourth estate has been analysed. The paper concludes that cyberactivism has a hopeful future to complement the continuing fights for justice and human rights.

The present study reports the extraction of bioactive compounds from Carissa edulis roots. Composite Center Design (CCD), a widely used form of Response Surface Methodology(RSM), was used to investigate the effect of process variables on the Microwave–Assisted Extraction(MAE). Four independent variables including extraction time (s), microwave power (W), methanol concentration (%), solvent-to-material ratio (mL/g), were studied on the response (total phenolic compounds, total flavonoids, total antioxidant activity and 1,1-diphenyl-2-picrylhydrazyl assay (DPPH). Analysis of variance showed that all factors were significant at the 5% on the measured effects. The results showed that the optimal MAE condition was obtained with an extraction time of 67.75s, microwave power of 536.41W, a methanol concentration of 43.82% and a solvent-to-material ratio of 12.55ml/g for a combination of (total phenolic compounds (5482.15 µg Gallic acid equivalents/g of Matter (µg GAE/g)), total flavonoids (206.89 µg Quercetinequivalents/g of Matter (µg QE/g) total antioxidant activity (12094.5 µg equivalents of Ascorbic Acid/g of Matter (µg EAA/g) and DPPH radical scavenging (75.10%)). Close agreement between experimental and predicted values was found. This methodology could be applied in the extraction of bioactive compounds in the natural product of industry

According to the technological requirements of the control system, the Siemens S7200PLC can operate the valve by liquid level sensor data, and complete automatically the liquid mixing in this liquid hybrid control system. It can undertake the single cycle or more cycle work, has the power memory function, and continue to work after the reset. Conditions monitor through the configuration interface has an application in industrial liquid mixture stirring device, and the realization of mixing process has realized automatic control, which can provide the strong guarantee for high mixer, mixing device of the smooth and orderly and accurate work.