Discrete-Time Chaotic-Map Truly Random Number Generators: Design, Implementation, and Variability Analysis of the Zigzag Map

In this paper, we introduce a novel discrete chaotic map named zigzag map that demonstrates excellent chaotic behaviors and can be utilized in Truly Random Number Generators (TRNGs). We comprehensively investigate the map and explore its critical chaotic characteristics and parameters. We further present two circuit implementations for the zigzag map based on the switched current technique as well as the current-mode affine interpolation of the breakpoints. In practice, implementation variations can deteriorate the quality of the output sequence as a result of variation of the chaotic map parameters. In order to quantify the impact of variations on the map performance, we model the variations using a combination of theoretical analysis and Monte-Carlo simulations on the circuits. We demonstrate that even in the presence of the map variations, a TRNG based on the zigzag map passes all of the NIST 800-22 statistical randomness tests using simple post processing of the output data.Comment: To appear in Analog Integrated Circuits and Signal Processing (ALOG

Response of sunflower hybrids to management practices under irrigated arid-environment

Two field experiments were established at Research Farm, Bahauddin Zakariya University, (BZU) Multan, Pakistan, during the spring season of 2009 to study the interactive effect of sunflower (Helianthus annuus L.) hybrids in terms of growth, fraction of intercepted radiation (Fi), intercepted photo-synthetically active radiation (PAR), yield components and oil contents to planting geometries and nitrogen rates. Experiment 1 comprised nine treatments having combinations of three hybrids (H1 = 19012; H2 = Hysun-33; H3 = DK-4040) and three planting geometries (PG1 = flat sowing; PG2 = ridge sowing; PG3 = bed sowing) while, experiment 2 comprised 16 treatments having combinations of four hybrids (H1 = 00989; H2 = 01087; H3 = 00997; H4 = 010226) and four nitrogen rates (N0 = control; N1 = 75; N2 = 150 and N3 = 225 kg ha-1). The results revealed that, the ontogeny maximum plant height ranged from 32 to 216 cm and from 36 to 299 cm in experiments 1 and 2, respectively. The ontogeny maximum number of leaves plant-1 were 21, 32, 28, 21 and 14 in experiment 1 and 20, 33, 29, 20 and 9 in experiment 2, respectively on respective harvest dates. The ontogeny maximum head diameter was 17, 22 and 25 cm and 20, 21 and 29 cm on respective dates for experiments 1 and 2, respectively. The ontogeny Fi values for experiments 1 and 2, ranged from 0.11 to 0.99 and from 0.09 to 0.99, respectively. The cumulative intercepted PAR ranged from 492 to 812 MJ m-2 and from 627 to 897 MJ m-2 in experiments 1 and 2, respectively. The achene weight ranged from 69.7 to 127.5g and from 65.4 to 93.4g in experiments 1 and 2, respectively. The number of achenes head-1 ranged from 919 to 1868 and 925 to 1678 for experiments 1 and 2, respectively. The achene oil contents ranged from 38.1 to 43.1% and 34.5 to 47.6% for experiments 1 and 2, respectively. However, average oil contents value was 41% for both experiments. From the results, the use of higher nitrogen rates and ridge or bed sowing techniques are recommended for the management practices for the newly developed sunflower hybrids farmers.Keywords: Sunflower hybrids, planting geometries, nitrogen rates, intercepted PA

Effect of Potassium Chloride on Physical and Optical Properties of Polystyrene

Composite materials are used in many industries such: solar cells, optoelectronic device elements, light emitting diodes, aircraft, military and car industry. In this paper, effect of potassium chloride on physical and optical properties of polystyrene has been studied to use the new material in many applications. The physical properties showed that the absorption of composite to water increases with increase time of the submerging in the water. Also, diffusion coefficient increases with increase the potassium chloride concentrations. The optical properties was measured in wavelength range from 200nm to 800nm. The experimental results showed that absorbance of polystyrene increases with increase  the potassium chloride concentrations. The optical constants (absorption coefficient, energy band gap, extinction coefficient, refractive index and real and imaginary parts of dielectric constants) are increasing with increase the potassium chloride concentrations. Keywords: optical properties, composites, physical properties, potassium chloride

Faktor-Faktor PengaruhMedia Sosial Terhadap Keunggulan Bersaing : Studi Kasus Coffee Toffee Indonesia

UKM (Usaha Kecil Menengah) merupakan salah satu sektor USAha yang penting di Indonesia karena memiliki peranan yang penting bagi pertumbuhan ekonomi di Indonesia. Meskipun telah banyak UKM yang berkembang di Indonesia dan menerapkan Teknologi Informasi untuk kegiatan bisnisnya, namun masih banyak pula UKM yang belum menerapkan Teknologi Informasi khususnya menggunakan media jejaring sosial dan belum mengerti seberapa besar manfaat dan peranan penggunaan media jejaring sosial tersebut. Padahal jejaring dan hubungan korelatif merupakan fasilitator penting bagi kegiatan bisnis Usaha Kecil Menengah. Untuk itulah, dilakukan suatu analisa melalui sebuah Usaha Kecil Menengah yang ada di Indonesia untuk mengetahui peranan penggunaaan sosial media bagi Usaha Kecil Menengah tersebut serta faktor-faktor pengaruh sosial media terhadap keunggulan bersaing Usaha Kecil Menengah. Hasil dari tugas akhir ini adalah sebuah dokumen hasil analisis tentang peranan fakfor-faktor pengaruh sosial media serta seberapa besar pengaruh media sosial terhadap keunggulan bersaing di Coffee Toffee Coffee Sho

Triple Differential Cross Sections for Electron-Impact Ionization of Methane at Intermediate Energy

We report an experimental and theoretical investigation of electron-impact single ionization of the highest occupied molecular orbital 1t2 and the next highest occupied molecular orbital 2a1 states of CH4 at an incident electron energy of 250 eV. Triple differential cross sections measured in two different laboratories were compared with results calculated within the molecular 3-body distorted wave and generalized Sturmian function theoretical models. For ionization of the 1t2 state, the binary peak was observed to have a single maximum near the momentum transfer direction that evolved into a double peak for increasing projectile scattering angles, as has been seen for ionization of atomic p-states. A detailed investigation of this evolution was performed. As expected because of its s-type character, for ionization of the 2a1 state, only a single binary peak was observed. Overall, good agreement was found between experiment and theory

Enhancing the Mechanical Properties of Concrete and Self-Healing Phenomena by adding Bacteria, Silica fume and Fibres

Concrete which is the most useable material in the world after the water has flaws, it is susceptible to cracking over time. These cracks occur in the form of shear cracks, flexural cracks, tension cracks, shrinkage cracks etc. With these cracks, some hair-like cracks also occur in concrete which are not visible during the visual inspection. The propagation of these cracks in concrete allows the water and many other chemicals to seep inside the concrete and leads to a decrease in its properties. Such properties include decreasing durability, erosion of rebars, and progressive failure in the concrete strength. Therefore, the repair of hair-like cracks is also essential for the long-term safety of structures. In the present study the Silica fume, and Polypropylene fibres are added to a rich concrete along with the bacteria named Bacillus Subtilis and Calcium Lactate for enhancement of its mechanical properties and self-healing phenomena. The effect of bacteria in the healing phenomenon and other properties is compared to normal concrete by casting the cylinders and beams. The slump, compressive strength, tensile strength, and self-healing phenomena are tested and found the increase in mechanical properties of concrete. The self-healing phenomena of cracks is observed by the Scanning Electron Microscope (SEM)

Mechanical and Fracture Surface Analysis of Higher Viscous Epoxy/Multiwalled Carbon Nanotube Nanocomposites Subjected to Flexural Loading

This study experimentally characterizes the effect of multiwalled carbon nanotubes (MWNTs) reinforced to higher viscous aircraft thermoset polymer epoxy. The effects of MWNTs weight percentage (wt%) to flexural and fracture toughness properties were investigated via Mode I fracture behaviour. This experiment found that the average increment in fracture toughness of 0.1 and 0.3 wt% MWNTs reinforced to epoxy is 62.7 and 31.8%, respectively. However, shifting to a higher viscosity epoxy lead to some difficulties like to remove void formed in matrix and harder to achieve appropriate carbon nanotubes (CNTs) dispersion due to limited pot life and working time. Morphological study analysis on fracture surface using field emission scanning electron microscopic (FESEM) shows that the mechanical properties enhancement was attributed to crack pinning, crack path deflection and localized inelastic matrix deformation due to agglomerated CNTs. The study concluded that the key important to the extent the strength and fracture toughness is by finding the appropriate processing method to achieve adequate state of CNTs dispersion within the matrix