Abstract— The basic idea of modular design is applied to the planning and analysis of the screw press sludge treatment system in this paper. A combination mode of sludge treatment system is obtained. The functional modules of the system are formed. The interface information relation of each module is analyzed by system function. The process parameters of each module were precisely configured according to the dry requirements of sludge treatment and the initial sludge concentration. The transfer relationship between modules is achieved. The control parameters are determined according to the transfer relationship. The parameter basis is provided for the control design of the system.
Keywords— Screw Process, Sludge drying treatment system, machinery, sludge concentration, control system.
Abstract— Mechanical and thermo-analytical analysis carried out on the composites. In order to determine the relationships between structure and properties of composite, it is necessary to carry out different measurements. The tests were: tensile test, hardness test, thermal conductivity SEM, DSC and DMA. The results showed that the mixtures were inhomogeneous. The tensile and hardness test resulted that the composite has stronger structure and an increase in the strength values. From the thermo-analytical analysis the corn cob additive effect in the composite structure can be observed. The result of the DMA shows that the additive works as inactive filler, and does not change the glass transition temperature of the rigid PVC foam.
Keywords— Composite, PVC, foam, DSC, DMA.
Abstract—The problem of simultaneous multiuser resource (subcarriers-and-bits) allocation algorithm in OFDMA-based multiple input-multiple output (MIMO) system has recently attracted significant interest. In this paper, we employ adaptive modulation technique and advanced use of multiple antennas at both the transmitter and receiver to develop four resource allocation schemes. The first scheme assigns subcarrier to the user with best channel gain and employs spatial multiplexing (SM) on the MIMO system to further enhance the throughput. The space-division multiple-access (SDMA) scheme assigns single subcarrier simultaneously to the terminals with pairwise “nearly orthogonal” spatial signatures. In the third scheme, we propose to design the transmit beamformers based on the zero-forcing (ZF) criterion such that the multiuser interference (MUI) is completely removed. Specifically, we propose a low-complexity iterated terminals-selection algorithm in conjunction with the ZF criterion such that the selected ZF (SZF) scheme can be exploited to achieve throughput multiplication. Alternatively, we propose a least-squares (LS) based multiuser resource allocation algorithm to cope with the over-determined system such that all users are allowed to share single subcarrier.
Keywords—SDMA, OFDMA, MIMO, Selected Zero-Forcing (SZF), Least-Squares (LS).
Abstract— E-commerce is that the shopping for marketing of products and services, or the sending of funds or knowledge, over a web and straightforward access to immense stores of reference material, email, and new avenues for advertising and data distribution, to call some. Like most technological advances, there conjointly another side: criminal hackers. Governments, companies, and personal voters round the world area unit anxious to be an area of this revolution, however, they are afraid that some hacker can burgle their net server and replace their brand with erotica, scan their e-mail, steals their MasterCard range from an on-line searching web site, or implant computer code that may on the QT transmit their organization secrets to the open net. Online shopping is used to getting order from the user through internet and mobile so, this is also called as mobile commerce. The goods are delivered to the customer with secured manner. The status about the product during delivery is to be monitored. A Secured Socket Layer (SSL) certificate is that the common place technique that wanted to defend net communications and it defend sensitive data because it travels across the net preventing any potential security attacks or threats on the approach. Essentially SSL could be a technology that encrypts and decrypts messages sent between the browser and server. Once the message is received by the server, SSL decrypts it, and verifies that it came from the right sender.
Keywords— HMM, K-MEANS, SSL.
Antimicrobial effect of bacteriocin from Lactobacillus fermentum isolated from goat milk on perishable foods. San Luis. Argentina
Abstract— Strain selected for this study was isolated and named as sl36, from samples of goat milk collected from stainless steel drums in a dairy farm (San Luis, Argentina). The LAB strain was biochemically typified as Lactobacillus fermentum and designated as L. fermentum sl36. This identification was confirmed by 16S rRNA full sequences. The selected strain showed antimicrobial activity against food-borne pathogens, Listeria monocytogenes, Listeria innocua, Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa and Escherichia coli. The inhibitory activity was lost after treatment with trypsin, which indicates that this activity is due to a protein nature substance compatible with bacteriocins produced by Gram positive bacteria.The inhibitory substance was stable at different pH and temperatures. Perishable food samples (semi-hard cheese, cream, cooked pork shoulder) were treated with cell free supernatant from studied strain and then with indicator S. aureus and E. faecalis bacteria suspensions. Lactobacillus fermentum sl36 caused the inhibition of the growth of E. faecalis and S. aureus in the treated foods. Our work shows that it is possible to increase the safety of food perishable directly using the bacteriocins produced by the LAB strains, difference from the more frequent practice of using the bacteria themselves as probiotics.
Keywords— Antimicrobial activity, goat milk, Lactic Acid Bacteria, Lactobacillus fermentum, perishable foods.
Microbial Fructosyltransferase: Production by Submerged Fermentation and Evaluation of pH and Temperature Effects on Transfructosylation and Hydrolytic Enzymatic Activities
Abstract—Fructosyltransferases (FTase, E.C. 18.104.22.168) are enzymes that catalyze transfructosylation reactions obtaining, as final product, fructose oligomers. In terms of industrial production, the use of microbial enzymes is interesting, especially those produced by Aspergillus sp. The aim of the work was to study the production of FTase by submerged fermentation and evaluation of pH and temperature effects on fructosyltransferase activity. The enzyme was produced by Aspergillus oryzae IPT 301 in a 10-liter bioreactor with growth medium containing sucrose as main carbon source. The assay was performed at 800 rpm, 30 °C, 0.75 vvm and pH 4.5. Transfructosylation (At) and hydrolytic (Ah) activities were determined in the temperature range from 35 to 65 °C and pH range from 3.5 to 6.0. It was observed that mycelial is increases with temperature, holding the maximum value at 50 – 65 ºC, while the optimum pH value were 5.0. The optimum temperature for extracellular At ranged from 55 to 65 °C and the optimum pH ranged from 5.0 to 6.0. Furthermore, the optimum temperature for mycelial Ah was 65 °C and optimum pH 4.5 - 5.0. For extracellular Ah, the optimum temperature and optimum pH were 55 to 65 °C and 3.5 to 6.0, respectively.
Keywords—Aspergillus oryzae, Bioreactor, Fructooligosaccharides, Fructosyltransferase.
Abstract— Space is dark because the photons released from sun have lost energy and became cold photons during their passage towards earth. Because photons do not have energy in space, so space is cold. When photons reach atmosphere, it hit suspended particles and get annihilated. Thus these photons produce energy and light is seen. A definite quantum of energy must hit retina of eye to detect light which is absent in space. This article explains the phenomenon assuming dual nature of light. Retina can see the particular wavelengths of light ranging from 380nm to 780nm.
Keywords— photon, space, energy, wavelength.
Effect of particle size distribution on mixing and segregation in a gas-solid fluidized bed with binary system
Abstract—The mixing and segregation characteristics were investigated in gas-solid fluidized beds with binary solid mixture. Bed materials were constituted with binary solids, having different size and density. To investigate the effect of particle size distribution on the mixing characteristics, two other binary solid mixtures were used, which have similar mean particle size and particle density, but their particle size distribution was different to each other. Bed column has ID=0.14 m and H=2.14m. Bed aspect ratio was 3.0. Bed materials were two sets: one of bed materials was the mixture of ilmenite (dp=153 mm, ρs=3,860 kg/m3) and coke (dp =582 mm, ρs =1,762 kg/m3), which has wide size distribution. The other bed materials was the mixture of ceramic beads (dp =122 mm, ρs =3,800 kg/m3) and plastic beads (dp =813 mm, ρs =1,500 kg/m3), which has narrow size distribution. Bed composition of ilmenite-coke mixture was determined to 0.7:0.3 by mass ratio. And, bed composition of ceramic beads-plastic beads was 0.75:0.25 by mass ratio. Axial bed pressure drop was measured according to gas velocity. Bed composition was measured according to axial bed height by sampling. Bed pressure drop of ilmenite-coke mixture was maximized above Uo=0.15 m/s, and fully fluidization was occurred. However, criterion of mixing to segregation was not found in the axial bed composition according to gas velocity. In the case of ceramicbeads-plastic beads mixture, bed pressure drop was maximized at Uo=0.05 m/s, and the criterion of mixing to segregation was found at the same gas velocity.
Keywords—gas-solid fluidized bed, segregation, mixing index, takeover velocity.
Abstract— Security in travelling is a primary concern for everyone. Rising demand for automobile has increased the traffic, thereby causing more accidents on the road. People often lose their lives because of poor emergency facilities in the case of unattended accidents. Pre-emption of the accidents taking place on the roads is not possible, but at least the after effects can be minimized. The proposed system ensures making emergency facilities available to accident victims as early as possible by letting relatives; by the way of monitoring the car using its number plate recognizes the camera. Before that it can act through the tollbooth, the vehicle number plate was captured by this camera and stores it in a database. It will check out that the vehicle was authorized or not, if the number plate was registered one, then it passes the entry to the vehicle, otherwise buzzer alarm will rise. When the car met an accident sense by vibration sensor making an alert to hospital or a rescue team knows the accident spot with the help of this module embedded in the vehicle. Sensors are attached to the ARDUINO-Controller. In the event that there is a mishap, the sensor gets enacted and the GSM framework will send notices to the closest doctor's facility, police headquarters or sort of the casualty with the area organizes where the mischance has happened. With the assistance of room route framework GPS finds the position of the vehicle where a mischance has happened.
Keywords— Collision Detection, messaging system, GPS, GSM, mobile communication, security issue, sensors, GSM framework.