Controlled-release system for the insect growth regulator cyromazine

An encapsulation system designed to give long-lasting effectiveness of the insect growth regulator (IGR) cyromazine (Neporex) against Culex pipiens (Culicidae) mosquito larvae was developed. The main thrust of the research was to develop a simple method for preparing controlled-release formulations by means of an extrusion technique in combination with a supplementary coating and to study the release characteristics and effectiveness of the formulations. A series of formulations were prepared with low-density polyethylene (LDPE 600) for the matrix and with polyurea or one of four types of polyurethane for the coating. The rate of release of the active material from the controlled-release formulations was determined in an in vitro dissolution system. The biological activity of the controlled-release formulations was tested in vivo against C. pipiens larvae. Received: 3 August 2000 / Accepted: 22 December 2000     

XRD profile analysis characterization of ultrafine grained Al–Mg alloys

The effect of impurities on the crystallite sizes and dislocation densities of ECAP-processed aluminum–magnesium alloys is studied by X-ray diffraction. It is shown that with increasing magnesium content the achievable reduction in crystallite size with ECAP eventually reaches a saturation state and a further reduction of the structural size seems unlikely. Simultaneously the dislocation density increases to a plateau level with increasing Mg content. In annealing experiments the microstructural stability of AlMg0.5 and the resulting changes are investigated by XRD profile analysis. It becomes evident that annealing leads to a moderate increase in crystallite size up to a temperature where accelerated crystallite growth begins. XRD results prior and after fatigue testing show an increase in crystallite size accompanied by a decrease in dislocation density.     

Optimal Doping for Enhanced SnO2 Sensitivity and Thermal Stability

Tin oxide nanocrystals (5–10 nm) doped with silica (0–15 wt %) were made by flame‐spray‐pyrolysis direct deposition onto the sensing electrodes and in situ stabilization by rapid flame annealing. Although increased SiO₂‐doping reduced the SnO₂ crystal and grain size, its sensing performance to ethanol vapor (0.1–50 ppm) exhibited an optimum with respect to SiO₂ content. The thermal stability and morphology of SiO₂‐doped SnO₂ nanoparticles were evaluated by sintering at 200–900 °C for 4–24 h in air. At low SiO₂ content, sintering of SnO₂ was prevented only partially resulting in small sinter necks (bottlenecks) between SnO₂ primary particles (smaller than twice the Debye length). This morphology drastically enhanced the sensitivity toward the analyte by maintaining a thermally stable high surface area and fully depleted connections at the primary particle necks. This enhancement is attributed mostly to the decreasing neck size of the SnO₂ SiO₂ heterojunctions rather than the decreasing SnO₂ crystallite and grain sizes with increasing SiO₂ doping. At high SiO₂ contents, SnO₂ sintering was inhibited as its grains were separated effectively by dielectric SiO₂; this resulted in isolated SnO₂ nanocrystals with drastically reduced sensitivity, thereby effectively being insulators.     

Open Pluggable Edge Services: An Architecture for Networked Content Services

The IETF's open pluggable edge services (OPES) working group focuses on rule-based, in-line transformation services of data flows between two Internet endpoints, such as Web servers and Web clients. The group has developed an architectural framework to authorize, invoke, and trace such application-level services. The framework follows a one-party consent model, which requires that at least one of the application-layer endpoints explicitly authorize each service. OPES services must also be reversible by request of the application endpoints     

Modelling and validation of granulation with heterogeneous binder dispersion and chemical reaction

In this paper a multidimensional model for binder granulation is presented. The particles undergo different transformations such as coalescence, compaction, and breakage. Further chemical reaction in the granules is taken into account in order to incorporate binder solidification which is observed to be a significant transformation in many industrial applications. The equations of the model framework are solved numerically with a direct simulation Monte Carlo (DSMC) algorithm. In addition to the comparison between experiment and simulation, the model framework also enables the study of critical parameters in binder granulation such as reaction rate (solidification of binder) and size of the added binder droplets, which demonstrates its promising potential.     

Coordinate transformations in object recognition.

A basic problem of visual perception is how human beings recognize objects after spatial transformations. Three central classes of findings have to be accounted for: (a) Recognition performance varies systematically with orientation, size, and position; (b) recognition latencies are sequentially additive, suggesting analogue transformation processes; and (c) orientation and size congruency effects indicate that recognition involves the adjustment of a reference frame. All 3 classes of findings can be explained by a transformational framework of recognition: Recognition is achieved by an analogue transformation of a perceptual coordinate system that aligns memory and input representations. Coordinate transformations can be implemented neurocomputationally by gain (amplitude) modulation and may be regarded as a general processing principle of the visual cortex. (PsycINFO Database Record (c) 2010 APA, all rights reserved)     

气泡城市

Spacebuster是个动态的充气结构，它是便携式、可拓展的场馆。设计旨在将各种公共空间转变为可以进行社交集会的场所。事实上，Spacebuster是Raumlabo健筑设计事务所对上一个项目Kuechenmonumenl的迭代创新，它使得曼哈顿和布鲁克林的春天大放异彩，承办了很多各种社交和公众活动。