Strong Secrecy for Erasure Wiretap Channels

We show that duals of certain low-density parity-check (LDPC) codes, when used in a standard coset coding scheme, provide strong secrecy over the binary erasure wiretap channel (BEWC). This result hinges on a stopping set analysis of ensembles of LDPC codes with block length $n$ and girth $\geq 2k$, for some $k \geq 2$. We show that if the minimum left degree of the ensemble is $l_\mathrm{min}$, the expected probability of block error is \calO(\frac{1}{n^{\lceil l_\mathrm{min} k /2 \rceil - k}}) when the erasure probability $\epsilon < \epsilon_\mathrm{ef}$, where $\epsilon_\mathrm{ef}$ depends on the degree distribution of the ensemble. As long as $l_\mathrm{min} > 2$ and $k > 2$, the dual of this LDPC code provides strong secrecy over a BEWC of erasure probability greater than $1 - \epsilon_\mathrm{ef}$.Comment: Submitted to the Information Theory Workship (ITW) 2010, Dubli

Effect of water and air flow on concentric tubular solar water desalting system.

This work reports an innovative design of tubular solar still with a rectangular basin for water desalination with flowing water and air over the cover. The daily distillate output of the system is increased by lowering the temperature of water flowing over it (top cover cooling arrangement). The fresh water production performance of this new still is observed in Sri Ramakrishna Mission Vidyalaya College of Arts and Science, Coimbatore (11° North, 77° East), India. The water production rate with no cooling flow was 2050ml/day (410ml/trough). However, with cooling air flow, production increased to 3050ml/day, and with cooling water flow, it further increased to 5000ml/day. Despite the increased cost of the water cooling system, the increased output resulted in the cost of distilled water being cut in roughly half. Diurnal variations of a few important parameters are observed during field experiments such as water temperature, cover temperature, air temperature, ambient temperature and distillate output

Test and Analysis of Sub-Components of Aluminum-Lithium Alloy Cylinders

Integrally machined blade-stiffened panels subjected to an axial compressive load were tested and analyzed to observe the buckling, crippling, and postcrippling response of the panels. The panels were fabricated from aluminum-lithium alloys 2195 and 2050, and both alloys have reduced material properties in the short transverse material direction. The tests were designed to capture a failure mode characterized by the stiffener separating from the panel in the postbuckling range. This failure mode is attributed to the reduced properties in the short transverse direction. Full-field measurements of displacements and strains using three-dimensional digital image correlation systems and local measurements using strain gages were used to capture the deformation of the panel leading up to the failure of the panel for specimens fabricated from 2195. High-speed cameras were used to capture the initiation of the failure. Finite element models were developed using an isotropic strain-hardening material model. Good agreement was observed between the measured and predicted responses for both alloys

A review on activated carbon: process, application and prospects

Activated carbon (AC) is used in different states of applications after its discovery as a strong and reliable adsorbent. An overview on AC is presented together with revisiting the sources of AC generation; methods used to generate AC comprising of pyrolysis activation; physical activation; chemical activation and steam pyrolysis. The important factors affecting the AC production, the possible applications of AC and their future prospects are also discussed. AC is applied in water, wastewater and leachate treatments in many countries, especially to polish the color, remove the odor and some heavy metals. It is cheap and available, and can be produced from agricultural waste materials, e.g. rice husk, palm oil shell and coconut shell. The AC’s fine and porous structure and an extremely large particle surface area (>1000 m2/g) results in making it possessed powerful adsorptive properties. Therefore, the adsorption process using AC is found to be a potentially viable method of removing pollutants from aqueous solutions

Synthesis and Characterization of Ag2S Doped Tio2 Nanocatalysts for the Photocatalytic Degradation of Methylene Blue Dye Under UV Light Irradiation

The Ag2S – TiO2 nanocatalysts&nbsp;were&nbsp;effectively synthesized using the precipitation–thermal decomposition method. Characterization of the prepared catalyst was conducted through X-ray diffraction (XRD), Field emission scanning electron microscope (FE-SEM), Energy dispersive spectra (EDS), Ultra-violet diffuse reflectance spectra (UV-DRS), Photoluminescence (PL), and X-ray photoelectron spectroscopy (XPS) measurements. The photocatalytic activity of Ag2S – TiO2 was examined for the deterioration of Methylene blue (MB) dye in aqueous solution under UV-A light. Ag2S – TiO2 demonstrated superior effectiveness compared to other photocatalysts (ZnO, Ag2S, TiO2, etc.) at pH 7 for MB dye mineralization. The effect of operational parameters including photocatalyst amount, dye concentration, and initial pH on MB dye photomineralization was analyzed. Active species trapping revealed the significant roles of holes, electrons, hydroxyl radicals, and superoxide radicals in the photocatalytic deterioration of MB dye. A proposed mechanism for dye deterioration using Ag2S – TiO2 was elucidated. Mineralization of MB dye was further confirmed through Chemical Oxygen Demand measurements. The catalyst exhibited reusability. Additionally, antibacterial activity evaluation revealed that Ag2S – TiO2 showed potential as an effective antibacterial agent

The role of the written script in shaping mirror-image discrimination: Evidence from illiterate, Tamil literate, and Tamil-Latin-alphabet bi-literate adults

Learning a script with mirrored graphs (e.g., d ≠ b) requires overcoming the evolutionary-old perceptual tendency to process mirror images as equivalent. Thus, breaking mirror invariance offers an important tool for understanding cultural re-shaping of evolutionarily ancient cognitive mechanisms. Here we investigated the role of script (i.e., presence vs. absence of mirrored graphs: Latin alphabet vs. Tamil) by revisiting mirror-image processing by illiterate, Tamil monoliterate, and Tamil-Latin-alphabet bi-literate adults. Participants performed two same-different tasks (one orientation-based, another shape-based) on Latin-alphabet letters. Tamil monoliterate were significantly better than illiterate and showed good explicit mirror-image discrimination. However, only bi-literate adults fully broke mirror invariance: slower shape-based judgments for mirrored than identical pairs and reduced disadvantage in orientation-based over shape-based judgments of mirrored pairs. These findings suggest learning a script with mirrored graphs is the strongest force for breaking mirror invariance

Efficient E-Wastage Management in Information Technology for Sustainable Growth

The exponential growth of manufacturing industry is mainly driven by electronic industry which in turn produces e wastage as a by-product. The term "waste" is defined for materials, objects which is dumped by the customer rather than recycled, which includes residue from reuse and recycling operations. Electronic waste [1], or e-waste, is a term coined for electronic products that have turned as unnecessary, non-working, unusable or have become obsolete, and have effectively reached the end of their functional life. As the technology is growing at high speed, much of electronic devices become e-waste after a very short period from the day when the product is manufactured. In fact, the collection of old electronic substances is the largest contributor to the e-waste. E-waste consists of computers, laptops and mobile phones with obsolete hardware and software, monitors, printers, TVs, CD players etc. The management of e-waste is essential and need of the hour as electronic devices often contain dangerous substances which can be life threatening and environmental unfriendly. Solving the e–waste management problem begins with schooling and the habit changes as a result of gaining the knowledge. In this paper an attempt is made to address the problem by an efficient work flow model

Induced subgraphs of zero-divisor graphs

Funding: Peter J. Cameron acknowledges the Isaac Newton Institute for Mathematical Sciences, Cambridge, for support and hospitality during the programme Groups, representations and applications: new perspectives (supported by EPSRC grant no. EP/R014604/1), where he held a Simons Fellowship. For this research, T. Kavaskar was supported by the University Grant Commissions Start-Up Grant, Government of India grant No. F. 30-464/2019 (BSR) dated 27.03. T. Tamizh Chelvam was supported by CSIR Emeritus Scientist Scheme (No. 21 (1123)/20/EMR-II) of Council of Scientific and Industrial Research, Government of India.The zero-divisor graph of a finite commutative ring with unity is the graph whose vertex set is the set of zero-divisors in the ring, with a and b adjacent if ab=0. We show that the class of zero-divisor graphs is universal, in the sense that every finite graph is isomorphic to an induced subgraph of a zero-divisor graph. This remains true for various restricted classes of rings, including boolean rings, products of fields, and local rings. But in more restricted classes, the zero-divisor graphs do not form a universal family. For example, the zero-divisor graph of a local ring whose maximal ideal is principal is a threshold graph; and every threshold graph is embeddable in the zero-divisor graph of such a ring. More generally, we give necessary and sufficient conditions on a non-local ring for which its zero-divisor graph to be a threshold graph. In addition, we show that there is a countable local ring whose zero-divisor graph embeds the Rado graph , and hence every finite or countable graph, as induced subgraph. Finally, we consider embeddings in related graphs such as the 2-dimensional dot product graph.Publisher PDFPeer reviewe

Effects of Wrist Deviator to Improve Ulnar and Radial Deviation Among Ulnar Nerve Injury Patient

Aim: To find out the effects of wrist deviator to improve ulnar and radial deviation among patients with ulnar nerve injury. Objectives: To assess the ulnar nerve injury using Allen\u27s test. Then using goniometer and kendal muscle strength to assess ROM and muscle strength of the affected extremity. To improve the radial and ulnar deviations using this therapeutic device. This assesses the therapeutic tool\u27s impact on participants\u27 ROM and muscle strength in ulnar and radial deviations Methodology: The study was done among ulnar nerve injury patients in the age group of 20 – 60 years. Totally of 100 patients were selected according to the classification of peripheral nerve injury. Grade 2 nerve injury patients were included in this study. Then the therapeutic device was given to that group of nerve injury patients to improve ROM and muscle strength to increase radial and ulnar deviations. The pre-test and post-test were evaluated by the goniometer and Kendall muscle testing scale. And the outcomes of the post-test results were analyzed. Result: The statistical analysis revealed a significant disparity between the pre-test and post-test results, leading to the rejection of the null hypothesis. This suggests that the intervention or treatment had a measurable impact on the measured variables. Conclusion: From this study, it is concluded that there is greater improvement in ROM and muscle strength by using this wrist deviator among ulnar nerve injury patients

Effect of Expressive Media to Reduce Aggressive Behaviour Among Adolescent Orphans

Introduction and Aim:&nbsp; Adolescence is a common time when aggressive behavior is seen. It is also one of the adolescent mental health issues connected to several psychiatric diseases in young people, especially in orphans. The aim of the study is to determine the “Effect of Expressive media to reduce aggressive behavior among adolescent orphans”. Material and methods: It is a quantitative quasi- experimental study done for 30 subjects (15 in the experimental group and 15 in the control group) in the age group of 12 to 18 years who participated from Premavasam orphanage, Gerugambakkam, Chennai. The Aggression Scale is used to assess the aggressive behavior among participants and the outcome measures taken by using the Aggression Questionnaire. The experimental group received 36 sessions of Expressive media intervention, whereas the control group received conventional occupational therapy intervention for 3 months. Result: After undergoing Expressive media intervention for teenage orphans, the experimental group significantly benefited, according to the statistical evaluation of the Aggression Questionnaire post-test. Conclusion: The study reveals that the use of expressive media as an intervention can effectively lower the incidence of violent behavior in adolescent orphans