The world of science and engineering of sustainability and nanotechnology are in today’s scientific fabric are in the aisles of newer scientific divination. Environmental, energy and socio-economic sustainability are the utmost needs of the hour. In the similar vision, nanotechnology needs to be aligned with diverse areas of natural sciences, applied sciences and engineering sciences. The definition of “sustainability” as described by Dr Gro Harlem Brundtland, former Prime Minister of Norway needs to be re-envisioned, rethought and rejuvenated with the passage of scientific history and time. Human struggles, human scientific and engineering challenges and human impact needs to be rethought as environmental protection and environmental disasters are in the path of immense scientific contemplation. In this paper, the author deeply discusses with verve and validation the integration of nanotechnology and sustainability. Human race today stands in the middle of deep scientific disaster and also scientific contemplation. Loss of ecological biodiversity and frequent environmental disasters are urging the scientific and engineering community to move towards newer scientific innovations and newer environmental engineering tools. Thus the need of a comprehensive treatise in the field of nanotechnology and sustainable development. Nanotechnology has vast and varied applications in the field of environmental pollution control. The author deeply targets these areas of scientific and engineering research endeavor. A newer era in the field of nanotechnology, nano-engineering and sustainability will surely usher in if a concerted effort is taken in the proper implementation of United Nations Sustainable Development Goals and the vision of Brundtland Commission Report. A new generation of scientists and engineers will move towards positive research directions if man and mankind innovates and envisions the basics and fundamentals of environmental engineering science, chemical process engineering, sustainable engineering and nanotechnology.

Are investigated a trajectory of new type in distant, space flights unlike usual trajectories of direct flight to heavenly object (Moon) it is supposed to use asymmetry of a gravitational field and to carry out flight bypassing the most power gravitational impact on the spacecraft. It leads to economy of power for 20-30 %.

Over the years, all parts of a commercial refrigerator, such as the compressor, heat exchangers, refrigerant, and packaging, have been improved considerably due to the extensive research and development efforts carried out by academia and industry. However, the achieved and anticipated improvement in conventional refrigeration technology are incremental since this technology is already nearing its fundamentals limit of energy efficiency is described is ‘magnetic refrigeration’ which is an evolving cooling technology. The word ‘green’ designates more than a colour. It is a way of life, one that is becoming more and more common throughout the world. An interesting topic on ‘sustainable technologies for a greener world’ details about what each technology is and how it achieves green goals. Recently, conventional chillers using absorption technology consume energy for hot water generator but absorption chillers carry no energy saving. With the aim of providing a single point solution for this dual purpose application, a product is launched but can provide simultaneous chilling and heating using its vapour absorption technology with 40% saving in heating energy. Using energy efficiency and managing customer energy use has become an integral and valuable exercise. The reason for this is green technology helps to sustain life on earth. This not only applies to humans but to plants, animals and the rest of the ecosystem. Energy prices and consumption will always be on an upward trajectory. In fact, energy costs have steadily risen over last decade and are expected to carry on doing so as consumption grows. Refrigerants such as hydrochloroflurocarbons (HCFCs) are present in the ground source heat pump (GSHP) systems and can pose a threat to the environment through being toxic, flammable or having a high global warming potential. However, new types and blends of refrigerant with minimal negative impacts are being developed. A correctly fitted system will also greatly reduce the potential for leakage, which is why using a professional installer is highly recommended. Significant CO2 savings can be gained by displacing fossil fuels. Even compared to the most efficient gas or oil condensing boilers, a well-designed heat pump with COP of 3-4 will reduce emissions by 30-35%. Further carbon savings can be made if the electricity used to power the pump comes from a renewable energy source such as photovoltaic or a renewable electricity tariff. Also, measures can be taken to reduce the impact of pollution from using grid electricity generated through fossil fuel. For example, one can purchase dual tariff green electricity from a number of suppliers. However, even if ordinary grid electricity is used to run the compressor, the system will still produce less CO2 emissions than even the most efficient condensing gas or oil boiler with the same output. The term “vapour compression refrigeration” is somewhat of a misnomer, it would be more accurately described as 'vapour suction refrigeration'. Vapour compression is used to reclaim the refrigerant and is more aptly applied to heat pumps. Vapour compression refrigeration exploits the fact that the boiling temperature of a liquid is intimately tied to its pressure. Generally, when the pressure on a liquid is raised its boiling (and condensing) temperature rises, and vice-versa. This is known as the saturation pressure-temperature relationship.

Elderly persons and patients with chronic illnesses are mostly affected by the pandemic disease Covid which also claims lives. It has terrible implications on daily living, public health, and the global economy. Finding positive examples as soon as feasible is difficult. There are only a certain amount of covid test kits available because of the daily rise in cases. Implementing an autonomous detection system as a speedy alternative diagnosis option is essential to stopping the future spread of this epidemic and to treating afflicted persons as soon as possible. Combining radiological imaging with the use of cutting-edge AI tools can be beneficial for the precise diagnosis of this illness and can also help distant areas who lack expert medical care to find a solution. In this project, we have used double deep neural networks to develop an automatic detection of Covid (Convolutional-Neural-Network model, VGG-16 model). Covid chest X-rays will be used as the history data. It will be determined whether the chestX-ray image is covid positive or covid negative.

Metals generally deteriorate with chemical attacks and reaction with environments. This paper investigates the effect of grape fruit extract on the corrosion of mild steel using weight loss and thermometric measurements. The concentration of the inhibitors used was varied from 0.1g/s to 0.5g/s in acidic medium. Standard concentrated HCl acid with density of 1.18g/cm3 and a percentage purity of 35% with a molar mass of 35.5g was used. The results shows that the corrosion rates obtained decreased with addition of different of concentrations of inhibitor with the lowest values were obtained at addition of highest concentration (0.5 g/l) of the studied extract. It could be observed that the temperature fluctuates with time and reach the peak at approximately 360 min and then decreased. The reason for this can be attributed to increase in blocking of free movement of corrosion product (Fe2+) by the adsorption of the inhibitor, thereby reducing the creation of more ions and its precipitates with increase in time. The weight loss of mild steel increased as the exposure time increases in the absence and presence of inhibitor. The higher the concentration of inhibition, the lower the corrosion rate and grape fruit juice is a good inhibitor of corrosion.

Corona, which is a phenomenon that occurs when the air around the conductor is ionized can occur in a 20 kV cubicle and damage the equipment. To prevent this occurrence, the air condition inside the cubicle need to be controlled at a safe level. In this study, we maintain an ideal air condition with Arduino-based humidity and temperature control system using ATMEGA328 microcontroller. This system was installed in the 20 kV cubicle at Lokomboro Micro Hydro Power Plant and then tested for performance. From the test result it was found that the system was able to control the humidity and temperature inside the cubicle at 45 % and 26 0C, respectively. By controlling humidity and temperature values at ideal condition, the corona appearance that damage the equipment has been prevented. This installation showed operational, financial, and company image benefit for PT. PLN since it has prevented loss due to damage of equipment and also maintained electrical power reliability.

The increased rates of microbial resistant to synthetic drugs have paved way for the use of medicinal plant extracts for treatment. Phytochemical screening and antimicrobial activity of Mangifera indica leaves extract on some isolates from dental cavities was studied. The leaves were randomly collected from a local farm in Agbani Nkanu West L.G.A Enugu State Nigeria. The leaf samples were morphologically identified, washed, air dried at room temperature for 48 days and milled into powder with a milling machine in Chemistry Department, Enugu state University of Science and Technology. The solvents used for extraction were ethanol, methanol, N-hexane and water. Ethanol and methanol extracted most of the bioactive ingredients, followed by water and N-Hexane. The phytochemicals screened were; terpenoids, steroids, glycosides, phenols, saponins, tannins and alkaloids. The extracts were divided into dialyzed and undialyzed fractions. The dialyzed fraction was done for 48 hours in a refrigerator. Organisms isolated from dental cavities were; Streptococcus mutans, Escherichia coli, Staphylococcus aureus, lactobacillus spp, Candida albicans. The antimicrobial activity was determined using agar well diffusion method and the result showed that the dialysed extracts of ethanol and methanol had higher sensitivity against the dental isolates than the undialyzed extracts. Streptococcus mutans was the most inhibited organism with inhibition zones of 12mm and minimum inhibitory concentration of 6.25mg/ml. Hence, dialysed ethanol and methanol leaf extracts of Mangifera indica can be used as an adjunct therapy for dental cavities.