Switching power supply filter

A filter for a switching power supply. The filter includes a common mode inductor with coil configurations allowing differential mode current from a dc source to pass through but attenuating common mode noise from the power supply so that the noise does not reach the dc source. The invention also includes the use of feed through capacitors at the switching power supply input terminals to provide further high-frequency noise attenuation

Novine u obrazovanju i stvaranju demokratskih čitatelja

The World Association of Newspapers, which represents 17000 newspapers, places great importance on Newspapers in Education and young reader programs as a vital way to increase reading among young people, heighten their sense of the vital importance of newspapers in democratic society and – the organization readily admits – encourage them to become newspaper readers. Indeed these projects constitute one of the organization\u27s four main activity sectors, along with marketing and management activities, press freedom development work and activities for editors in chief. In more than 50 democracies worldwide, schools and newspapers have created partnerships that help a new generation of citizens learn the importance of press freedom and journalistic ethics. Such programs encompass two overall kinds of tasks: use of newspapers in a classroom and the real, if temporary, journalistic experience for young people.Svjetsko udruženje novinskih izdavača, koje predstavlja 17 000 novina, polaže veliku važnost ulozi novina u obrazovanju i ostvarenju programa “mladih čitatelja”, smatrajući to važnim načinom razvijanja čitateljskih navika kod mladih ljudi, te podizanjem njihovih osjećaja za važnost novinarstva u demokratskim društvima i – što organizacija često ističe – na taj način ih ohrabriti da postanu čitatelji novina. Naime, taj projekt je jedan od četiri osnovna područja djelovanja organizacije, uz aktivnosti vezane za marketing i menagement, unapređenje slobode u novinarskom poslu i aktivnosti koje su vezane za rad glavnih urednika. U više od 50 zemalja s razvijenom demokracijom, škole i novine ostvarile su različite oblike suradnje kojima pomažu novim generacijama građana naučiti važnost novinarske slobode i etike. Tu se razlikuju dvije osnovne vrste zadataka: upotreba novina u školskoj nastavi i stjecanje iako kratkotrajnog ipak konkretnog novinarskog iskustva za mlade ljude

A Proposed Model for Enhanced Security against Key Reinstallation Attack on Wireless Networks

Wireless network security is advancing consistently. This progress can be easily seeing by recounting the success stories achieved through the years since the modification of its first security protocol, WEP; then the WPA and finally the WPA2. The Wireless Protocol Access Pre-Shared Key (WPA2-PSK) mode is usually adopted by Small Office Home Office (SOHO) environments as it does not require a costly investment on a dedicated authentication system. Nevertheless, despite the fact that this mode was improved consistently, the core part (4-way handshake) still presents several vulnerabilities such as the key reinstallation attack (KRACK) which was discovered by Vanhoef and Piessens in 2016 and published in October, 2017. Here, we proposed an enhanced model which involved a Boolean variable that switches from true to false once the Key is installed; also, we include handshake messages encryption with Pair-wise Master Key as the encryption/decryption key, using Advance Encryption Standard (AES). Results obtained from the simulations of the enhanced model were compared with that of the existing model. The message execution time measured in micro seconds shows that the proposed model is more efficient than the existing four-way handshake model and it prevent the reinstallation of the Pair-wise Master key (PTK) during the handshake process. &nbsp

An Ethical Appraisal of Social Justice in the Book of Amos and Its Implications for Socio-Religious Integrity in Contemporary Nigerian Society

Social justice is a situation or social condition predicated on human rights and equality which social injustice does not guarantee. This paper examines the concept of social justice in the book of Amos and presents its ethical implications for the contemporary Nigerian society. The aim of this paper is not to do an exegesis of the book of Amos, but to consider the moral messages of prophecy of Amos as it affects the socio-religious integrity in contemporary Nigerian society. The work uses the tripartite historical, sociological and expository approaches in analysing data which is mainly obtained from secondary sources. The findings in this paper revealed that Nigeria accommodates certain social conditions that are similar to those in Israel at the time of Amos; the wealth of the nation is concentrated in the hands of the few privileged and mostly corrupt Nigerians. The poor masses are suffering in the midst of multimillionaires who corruptly enriched themselves at the expense of the poor masses who are divided along tribal and religious lines without the unity needed to challenge their corrupt leaders. This paper therefore recommends the application of, Amos' teaching on social justice by Christians in Nigeria to remedy the situation of gross injustice and economic inequality in the contemporary Nigerian society that is obviously lacking in religious and moral integrit

Evolution of soil and water conservation in rain-fed areas of China

AbstractRain-fed (dryland) farming is an ancient agricultural production system in China. It occurs widely across almost the whole country, especially in the Northwest and North China. The semi-arid Loess Plateau is the most important region of rain-fed farming in China, but unfortunately, soil erosion on the Loess Plateau area is the highest in China, and indeed amongst the highest in the world. This highlights the necessity for developing practices that can reduce soil and water erosion, improve soil water use efficiency, improve crop productivity, and reduce rural poverty in the region. Many techniques of soil and water conservation are being used in rain-fed areas of China, including such systems as mulch, ridge and furrow systems. The Appendix describes a unique system of soil and water conservation, called Shatian.Modern research on conservation tillage (No Till), although essential for reducing erosion, increasing crop productivity, and ameliorating poverty, is just beginning in China. Modern conservation tillage research started in the1990s' with support from Australia and other countries. The procedures, however, were modified to be in accord with local conditions and prevailing farmer experiences. With 10 years of experimentation, results show that the most successful conservation practice on the Western Loess Plateau is no till with stubble retention. This technique helps to conserve soil water, increases soil organic carbon, improves soil structure and water infiltration, reduces soil and water erosion, and improves crop productivity and sustainability of rain-fed farming systems. However, its adoption rate remains low due to barriers such as traditional attitude, insufficient rural extension, and so forth

GIS-Based Underground Water Quality Risk Mapping of Kaltungo L.G.A, Gombe State, Nigeria

The research aimed at identification and risk mapping of the concentration of physiochemical properties of some metal ions in the underground water in Kaltungo LGA of Gombe State with the aid of Geospatial Techniques. Water samples used comprises of all of the 40 wells and boreholes were sampled and two control points and out of that, wells constitute about 25 and 15 boreholes respectively. Also, ten metals ions which includes;  Alkalinity of the water, B.O.D, C.O.D, D.O, Chloride, Electric Conductivity, Fluoride,Nitrate, phosphate, Sulphate, T.Hard, were selected and analyzed in laboratory. DEM, Curvature, Watershed, Aspect, Slope and Hillshed were also used. The methods employed were both Laboratory and Geospatial techniques.  The result obtained from the lab was compared with WHO standards, imported in to ArcGIS 10.3 environment and interpolated and subsequent analysis were done using kringing methods and query. Based on the query from the geodatabase of the underground water, it was found that 60% out of the metal ions used in this study were not in conformity with the WHO standards for drinking water. Amongst these metals are; Electric Conductivity, Fluoride, Nitrate, Sulphate, T.Hard and T.Hard. It was also found that 97.5% of the wells and boreholes have higher concentration of Fluoride, 85% Sulphate, 75% Electric Conductivity and 55% Nitrate while 32.5% and 30% have lower concentration of T.Hard and Turbidity respectively. Again reveal that those metals with higher concentrations of physiochemical properties are found to be within lower elevation, moderately water table due to down slope movement of water.Moreover, it was revealed that due to the convex profile curvature and watershed nature of the study area physiochemical of the water was accelerating to the lower slope towards the Northeast and Eastern part of the study area. Furthermore, it was found from the risk map that the vulnerability underground water risk area was the Northeast, central and Eastern part of Kaltungo. It was recommended that GIS techniques should be of paramount used in examine water related issues so as the results will served as a basis for decision support for WHO and others related organizations

Evaluation of physical, mechanical, and thermal properties of woven kenaf/ bio-epoxy composites

The demand for eco-friendly materials in many sectors is due to the age-long usage of synthetic materials, which has so many negative impacts on the environment, high energy consumption, and health concerns. The physical, mechanical, morphological, and thermal properties of woven kenaf fibre reinforced bio-epoxy composites are investigated in this study. The bio-composites were produced utilizing a manual lay-up process with varying fibre loading percentages of 30%, 35%, and 40%. Pure Bio-epoxy composites were also prepared as a reference. Physical, mechanical, morphological, and thermal characteristics were assessed. The density and water absorption of the bio-composites increase as the fibre loading increased. The highest density (1.2559 g/cm3) was shown by 40% fibre loading which also exhibited the highest water absorption of 9.8%. Furthermore, the void content revealed that the pure bio-epoxy has the highest value of 3.16% as compared to kenaf/bio-epoxy composites. The highest tensile strength and Young’s modulus was recorded by 40% fibre loading with 92.47 MPa and 9.18 GPa respectively. Impact properties also show enhancement with the increase in fibre loading, it showed the highest impact strength of 7280.8 J/m2at 40% fibre loading. Scanning electron microscopy (SEM) of the tensile fracture indicates that 40% fibre loading shows better fibre and bio-epoxy inter facial bonding because of its higher strength. The Initial decomposition temperature (IDT) of the bio-composites happens at about 230°C–280°C, and the Final decomposition temperature (FDT) is 540°C–560°C which is lower when compared to the pure bio-epoxy composites of 279°C and 560°C. Kenaf/bio-epoxy composites with 40% fibre loading show the best physical and mechanical and thermal properties. Based on our findings, we believe that our green bio-composites has the potential to be employed in various industries such as automobiles, construction and packaging