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- Viruses, Vol. 4, Pages 654-662: Evaluation of the Long-Term Effect of Air Filtration on the Occurrence of New PRRSV Infections in Large Breeding Herds in Swine-Dense Regions
- Molecules, Vol. 17, Pages 4860-4877: The Antimicrobial Efficacy of Elaeis guineensis: Characterization, in Vitro and in Vivo Studies
- Molecules, Vol. 17, Pages 4851-4859: Superconducting Fullerene Nanowhiskers
- Molecules, Vol. 17, Pages 4836-4850: Antimicrobial and Antioxidant Activities of Essential Oils of Satureja thymbra Growing Wild in Libya
- Second Life 3.3.2.254524 - Expansive online society, lived in and built by its participants.. (Free)
- BitNami Tracks Stack 2.1-0 - Easy-to-install distribution of the Tracks application.. (Free)
- BitNami phpBB Stack 3.0.10-1 - Easily deploy phpBB.. (Free)
- BitNami Cloud Tools 1.3-6 - Installer package for AWS command-line tools.. (Free)
- Peak plastic
- Molecules, Vol. 17, Pages 4824-4835: Inhibitory Effects of Acetylmelodorinol, Chrysin and Polycarpol from Mitrella kentii on Prostaglandin E2 and Thromboxane B2 Production and Platelet Activating Factor Receptor Binding
- Micromachines, Vol. 3, Pages 364-378: Micro-Ramps for Hypersonic Flow Control
- Micromachines, Vol. 3, Pages 345-363: Strong Electro-Absorption in GeSi Epitaxy on Silicon-on-Insulator (SOI)
- Micromachines, Vol. 3, Pages 331-344: MEMS-Based Boiler Operation from Low Temperature Heat Transfer and Thermal Scavenging
- Micromachines, Vol. 3, Pages 325-330: Time of Flight Sensor with a Flow Parallel Wire
- The Island: Castaway HD - Screenshots
- OnyX 2.4.6b1 - Maintenance and optimisation tool (beta).. (Free)
- CrystalMaker 8.6.0 - Display and manipulate crystal structures.. (Demo)
- Smultron 4.3.1 - Text editor with easy document selection.. (Commercial)
- Sensors, Vol. 12, Pages 5328-5348: Nonlinear Adaptive PID Control for Greenhouse Environment Based on RBF Network
- Sensors, Vol. 12, Pages 5310-5327: Angular Motion Estimation Using Dynamic Models in a Gyro-Free Inertial Measurement Unit
| Posted: 26 Apr 2012 12:00 AM PDT Airborne transmission of porcine reproductive and respiratory syndrome virus (PRRSV) is a risk factor for the infection of susceptible populations. Therefore, a long‑term sustainability study of air filtration as a means to reduce this risk was conducted. Participating herds (n = 38) were organized into 4 independent cohorts and the effect of air filtration on the occurrence of new PRRSV infections was analyzed at 3 different levels from September 2008 to January 2012 including the likelihood of infection in contemporary filtered and non-filtered herds, the likelihood of infection before and after implementation of filtration and the time to failure in filtered and non-filtered herds. Results indicated that new PRRSV infections in filtered breeding herds were significantly lower than in contemporary non-filtered control herds (P < 0.01), the odds for a new PRRSV infection in breeding herds before filtration was 7.97 times higher than the odds after filtration was initiated (P < 0.01) and the median time to new PRRSV infections in filtered breeding herds of 30 months was significantly longer than the 11 months observed in non-filtered herds (P < 0.01). In conclusion, across all 3 levels of analysis, the long-term effect of air filtration on reducing the occurrence of new PRRSV infections in the study population was demonstrated. |
| Posted: 26 Apr 2012 12:00 AM PDT The urgent need to treat multi-drug resistant pathogenic microorganisms in chronically infected patients has given rise to the development of new antimicrobials from natural resources. We have tested Elaeis guineensis Jacq (Arecaceae) methanol extract against a variety of bacterial, fungal and yeast strains associated with infections. Our studies have demonstrated that E. guineensis exhibits excellent antimicrobial activity in vitro and in vivo against the bacterial and fungal strains tested. A marked inhibitory effect of the E. guineensis extracts was observed against C. albicans whereby E. guineensis extract at ½, 1, or 2 times the MIC significantly inhibited C. albicans growth with a noticeable drop in optical density (OD) of the bacterial culture. This finding confirmed the anticandidal activity of the extract on C. albicans. Imaging using scanning (SEM) and transmission (TEM) electron microscopy was done to determine the major alterations in the microstructure of the extract-treated C. albicans. The main abnormalities noted via SEM and TEM studies were the alteration in morphology of the yeast cells. In vivo antimicrobial activity was studies in mice that had been inoculated with C. albicans and exhibited good anticandidal activity. The authors conclude that the extract may be used as a candidate for the development of anticandidal agent. |
| Molecules, Vol. 17, Pages 4851-4859: Superconducting Fullerene Nanowhiskers Posted: 26 Apr 2012 12:00 AM PDT We synthesized superconducting fullerene nanowhiskers (C60NWs) by potassium (K) intercalation. They showed large superconducting volume fractions, as high as 80%. The superconducting transition temperature at 17 K was independent of the K content (x) in the range between 1.6 and 6.0 in K-doped C60 nanowhiskers (KxC60NWs), while the superconducting volume fractions changed with x. The highest shielding fraction of a full shielding volume was observed in the material of K3.3C60NW by heating at 200 °C. On the other hand, that of a K-doped fullerene (K-C60) crystal was less than 1%. We report the superconducting behaviors of our newly synthesized KxC60NWs in comparison to those of KxC60 crystals, which show superconductivity at 19 K in K3C60. The lattice structures are also discussed, based on the x-ray diffraction (XRD) analyses. |
| Posted: 26 Apr 2012 12:00 AM PDT The composition of essential oil isolated from Satureja thymbra, growing wild in Libya, was analyzed by GC and GC-MS. The essential oil was characterized by γ-terpinene (39.23%), thymol (25.16%), p-cymene (7.17%) and carvacrol (4.18%) as the major constituents. Antioxidant activity was analyzed using the 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging method. It possessed strong antioxidant activity (IC50 = 0.0967 mg/mL). The essential oil was also screened for its antimicrobial activity against eight bacterial and eight fungal species, showing excellent antimicrobial activity against the microorganisms used, in particular against the fungi. The oil of S. thymbra showed bacteriostatic activity at 0.001–0.1 mg/mL and was bactericidal at 0.002–0.2 mg/mL; fungistatic effects at 0.001–0.025 mg/mL and fungicidal effects at 0.001–0.1 mg/mL. The main constituents thymol, carvacrol and γ-terpinene also showed strong antimicrobial activity. The commercial fungicide bifonazole showed much lower antifungal activity than the tested oil. |
| Second Life 3.3.2.254524 - Expansive online society, lived in and built by its participants.. (Free) Posted: 26 Apr 2012 02:49 AM PDT  Second Life is a 3-D virtual world entirely built and owned by its residents. Since opening to the public in 2003, it has grown explosively and today is inhabited by a total of 5,145,919 people from around the globe. From the moment you enter the World you'll discover a vast digital continent, teeming with people, entertainment, experiences and opportunity. Once you've explored a bit, perhaps you'll find a perfect parcel of land to build your house or business. You'll also be surrounded by the Creations of your fellow residents. Because residents retain the rights to their digital creations, they can buy, sell and trade with other residents. The Marketplace currently supports millions of US dollars in monthly transactions. This commerce is handled with the in-world unit-of-trade, the Linden dollar, which can be converted to US dollars at several thriving online Linden Dollar exchanges. Welcome to Second Life. We look forward to seeing you in-world. Your first Basic account is FREE, and includes access to events, shopping, building, scripting- everything you can do in Second Life. After your first free Basic Account, each Additional Basic Account (known in-world as an "alt" account) costs a one-time fee of $9.95. A Premium Second Life account, starting at $9.95 a month, allows you to own land on which you can build, display, entertain and live. View the QuickTime Trailer. Enhancements:
Crash and Performance Fixes
Bug Fixes
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| BitNami Tracks Stack 2.1-0 - Easy-to-install distribution of the Tracks application.. (Free) Posted: 25 Apr 2012 09:00 PM PDT  BitNami Tracks Stack Native Installer is an easy-to-install distribution of the Tracks application. It includes pre-configured, ready-to-run versions of Apache, MySQL, Ruby and Rails so users can get a Tracks installation up and running in minutes after answering a few questions. Windows, Linux and Mac OS X operating systems are supported. Tracks is a Ruby on Rails web-based application to help you implement David Allen's Getting Things Done methodology. Tracks is Open Source and licensed under the GNU GPL.
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| BitNami phpBB Stack 3.0.10-1 - Easily deploy phpBB.. (Free) Posted: 25 Apr 2012 09:00 PM PDT  BitNami phpBB Stack makes it easy to deploy phpBB, which is one of the leading bulletin board solutions and phpBB has always comprised of a key feature set, including powerful permission systems, private messaging, search functions, a customizable template and language system, as well as support for multiple databases. In the 5 years that have followed its initial release, phpBB2 has gained a huge following worldwide and has played an important role in defining the success of Open Source software. The BitNami phpBB Stack native installers were packaged using BitRock's cross platform installer tool.
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| BitNami Cloud Tools 1.3-6 - Installer package for AWS command-line tools.. (Free) Posted: 25 Apr 2012 09:00 PM PDT  BitNami Cloud Tools packages the Amazon Web Services command line tools together with preconfigured Java, Ruby and Perl language runtimes. It is a self-contained, easy to use distribution with one goal in mind: to make it simple to get started using AWS services from the command line.
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| Posted: 26 Apr 2012 02:29 AM PDT Materials scientist Debbie Chacra writes about "peak plastic" -- the moment at which our ability to make plastic (which is made from oil) begins to decline. As Debbie points out, our material world is made of plastic, and it's hard to imagine a post-plastics life.
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| Posted: 26 Apr 2012 12:00 AM PDT Acetylmelodorinol, chrysin and polycarpol, together with benzoic acid, benzoquinone and stigmasterol were isolated from the leaves of Mitrella kentii (Bl.) Miq. The compounds were evaluated for their ability to inhibit prostaglandin E2 (PGE2) and thromboxane B2 (TXB2) production in human whole blood using a radioimmunoassay technique. Their inhibitory effect on platelet activating factor (PAF) receptor binding to rabbit platelet was determined using 3H-PAF as a ligand. Among the compounds tested, chrysin showed a strong dose-dependent inhibitory activity on PGE2 production (IC50 value of 25.5 µM), which might be due to direct inhibition of cyclooxygenase-2 (COX-2) enzymatic activity. Polycarpol, acetylmelodorinol and stigmasterol exhibited significant and concentration-dependent inhibitory effects on TXB2 production with IC50 values of 15.6, 19.1 and 19.4 µM, respectively, suggesting that they strongly inhibited COX-1 activity. Polycarpol and acetylmelodorinol showed strong dose-dependent inhibitory effects on PAF receptor binding with IC50 values of 24.3 and 24.5 µM, respectively. |
| Micromachines, Vol. 3, Pages 364-378: Micro-Ramps for Hypersonic Flow Control Posted: 26 Apr 2012 12:00 AM PDT Shock/boundary layer interaction (SBLI) is an undesirable phenomenon, occurring in high-speed propulsion systems. The conventional method to manipulate and control SBLI is using a bleed system that involves the removal of a certain amount of mass of the inlet flow to control boundary layer separation. However, the system requires a larger nacelle to compensate the mass loss, larger nacelles contribute to additional weight and drag and reduce the overall performance. This study investigates a novel type of flow control device called micro-ramps, a part of the micro vortex generators (VGs) family that intends to replace the bleed technique. Micro-ramps produce pairs of counter-rotating streamwise vortices, which help to suppress SBLI and reduce the chances of flow separation. Experiments were done at Mach 5 with two micro-ramp models of different sizes. Schlieren photography, surface flow visualization and infrared thermography were used in this investigation. The results revealed the detailed flow characteristics of the micro-ramp, such as the primary and secondary vortices. This helps us to understand the overall flow physics of micro-ramps in hypersonic flow and their application for SBLI control. |
| Posted: 26 Apr 2012 12:00 AM PDT We have investigated the selective epitaxial growth of GeSi bulk material on silicon-on-insulator substrates by reduced pressure chemical vapor deposition. We employed AFM, SIMS, and Hall measurements, to characterize the GeSi heteroepitaxy quality. Optimal growth conditions have been identified to achieve low defect density, low RMS roughness with high selectivity and precise control of silicon content. Fabricated vertical p-i-n diodes exhibit very low dark current density of 5 mA/cm2 at −1 V bias. Under a 7.5 V/µm E-field, GeSi alloys with 0.6% Si content demonstrate very strong electro-absorption with an estimated effective ∆α/α around 3.5 at 1,590 nm. We compared measured ∆α/α performance to that of bulk Ge. Optical modulation up to 40 GHz is observed in waveguide devices while small signal analysis indicates bandwidth is limited by device parasitics. |
| Posted: 26 Apr 2012 12:00 AM PDT Increasing world-wide energy use and growing population growth presents a critical need for enhanced energy efficiency and sustainability. One method to address this issue is via waste heat scavenging. In this approach, thermal energy that is normally expelled to the environment is transferred to a secondary device to produce useful power output. This paper investigates a novel MEMS-based boiler designed to operate as part of a small-scale energy scavenging system. For the first time, fabrication and operation of the boiler is presented. Boiler operation is based on capillary action that drives working fluid from surrounding reservoirs across a heated surface. Pressure is generated as working fluid transitions from liquid to vapor in an integrated steamdome. In a full system application, the steam can be made available to other MEMS-based devices to drive final power output. Capillary channels are formed from silicon substrates with 100 µm widths. Varying depths are studied that range from 57 to 170 µm. Operation of the boiler shows increasing flow-rates with increasing capillary channel depths. Maximum fluid mass transfer rates are 12.26 mg/s from 170 µm channels, an increase of 28% over 57 µm channel devices. Maximum pressures achieved during operation are 229 Pa. |
| Micromachines, Vol. 3, Pages 325-330: Time of Flight Sensor with a Flow Parallel Wire Posted: 26 Apr 2012 12:00 AM PDT A time of flight sensor has been equipped with a sensing wire parallel to the flow direction (flow parallel wire, FPW). A heat pulse is generated with a coil in the flow channel. The FPW has a center tap allowing its upstream and downstream parts to join in a half bridge. When a heat pulse passes the FPW, a large output peak is generated. The time between heat pulse generation and recording the peak maximum is only marginally affected by the properties of the fluid. With a combination of two FPWs, a measuring range of approximately 0.01–0.5 m/s can be achieved. |
| The Island: Castaway HD - Screenshots Posted: 26 Apr 2012 03:02 AM PDT Features: - 12 Absorbing locations - 14 Unique and fascinating characters - Over 200 quests to solve - Huge, perplexing island to investigate - Plot that's full of twists and turns - Game Center Support - iOS 4+ multitasking support |
| OnyX 2.4.6b1 - Maintenance and optimisation tool (beta).. (Free) Posted: 26 Apr 2012 01:41 AM PDT  OnyX is a multifunctional utility for Mac OS X. It allows you to verify the startup disk and the structure of its System files, to run miscellaneous tasks of system maintenance, to configure the hidden parameters of the Finder, Dock, Spotlight, and of some of Apple's own applications, to delete caches, to remove a certain number of files and folders that may become cumbersome and more. Version 2.4.6b1:
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| CrystalMaker 8.6.0 - Display and manipulate crystal structures.. (Demo) Posted: 26 Apr 2012 02:01 AM PDT  CrystalMaker is an award-winning Mac program for building, displaying and manipulating all kinds of crystal and molecular structures. CrystalMaker makes it easy to load structural data and generate photo-realistic images, with the option of "out-of-the-screen" 3D images. Models can be displayed immediately in ball-and-stick, thermal ellipsoid, space-filling, wire-frame, stick and polyhedral model types. All aspects of the model can be extensively customized, with a wide range of photo-realistic or stylized "line-art" representations. See our online gallery for 3D movies, rotating crystals, animations and slideshows. Version 8.6.0: Major update, featuring:
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| Smultron 4.3.1 - Text editor with easy document selection.. (Commercial) Posted: 26 Apr 2012 01:45 AM PDT  Smultron is what your text needs. It is a text editor for the rest of us which is both easy to use and elegant but still very powerful. With it you can easily write and edit unformatted text. Features:
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| Posted: 26 Apr 2012 12:00 AM PDT This paper presents a hybrid control strategy, combining Radial Basis Function (RBF) network with conventional proportional, integral, and derivative (PID) controllers, for the greenhouse climate control. A model of nonlinear conservation laws of enthalpy and matter between numerous system variables affecting the greenhouse climate is formulated. RBF network is used to tune and identify all PID gain parameters online and adaptively. The presented Neuro-PID control scheme is validated through simulations of set-point tracking and disturbance rejection. We compare the proposed adaptive online tuning method with the offline tuning scheme that employs Genetic Algorithm (GA) to search the optimal gain parameters. The results show that the proposed strategy has good adaptability, strong robustness and real-time performance while achieving satisfactory control performance for the complex and nonlinear greenhouse climate control system, and it may provide a valuable reference to formulate environmental control strategies for actual application in greenhouse production. |
| Posted: 26 Apr 2012 12:00 AM PDT In this paper, we summarize the results of using dynamic models borrowed from tracking theory in describing the time evolution of the state vector to have an estimate of the angular motion in a gyro-free inertial measurement unit (GF-IMU). The GF-IMU is a special type inertial measurement unit (IMU) that uses only a set of accelerometers in inferring the angular motion. Using distributed accelerometers, we get an angular information vector (AIV) composed of angular acceleration and quadratic angular velocity terms. We use a Kalman filter approach to estimate the angular velocity vector since it is not expressed explicitly within the AIV. The bias parameters inherent in the accelerometers measurements' produce a biased AIV and hence the AIV bias parameters are estimated within an augmented state vector. Using dynamic models, the appended bias parameters of the AIV become observable and hence we can have unbiased angular motion estimate. Moreover, a good model is required to extract the maximum amount of information from the observation. Observability analysis is done to determine the conditions for having an observable state space model. For higher grades of accelerometers and under relatively higher sampling frequency, the error of accelerometer measurements is dominated by the noise error. Consequently, simulations are conducted on two models, one has bias parameters appended in the state space model and the other is a reduced model without bias parameters. |
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