The Structural Transformation of the Public Sphere: An Inquiry into a Category of Bourgeois Society

Abstract A two-dimensional version of the Pennsylvania State University mesoscale model has been applied to Winter Monsoon Experiment data in order to simulate the diurnally occurring convection observed over the South China Sea. The domain includes a representation of part of Borneo as well as the sea so that the model can simulate the initiation of convection. Also included in the model are parameterizations of mesoscale ice phase and moisture processes and longwave and shortwave radiation with a diurnal cycle. This allows use of the model to test the relative importance of various heating mechanisms to the stratiform cloud deck, which typically occupies several hundred kilometers of the domain. Frank and Cohen's cumulus parameterization scheme is employed to represent vital unresolved vertical transports in the convective area. The major conclusions are: Ice phase processes are important in determining the level of maximum large-scale heating and vertical motion because there is a strong anvil componen...

Numerical study of convection observed during the Winter Monsoon Experiment using a mesoscale two-dimensional model [presentation]

The successful synthesis of noble-metal nanocrystals with controlled shapes offers many opportunities to not only maneuver their physicochemical properties but also optimize their figures of merit in a wide variety of applications. In particular, heterogeneous catalysis and surface science have benefited enormously from the availability of this new class of nanomaterials as the atomic structure presented on the surface of a nanocrystal is ultimately determined by its geometric shape. The immediate advantages may include significant enhancement in catalytic activity and/or selectivity and substantial reduction in materials cost while providing a well-defined model system for mechanistic study. With a focus on the monometallic system, this review article provides a comprehensive account of recent progress in the development of noble-metal nanocrystals with controlled shapes, in addition to their remarkable performance in a large number of catalytic and electrocatalytic reactions. We hope that this review article offers the impetus and roadmap for the development of next-generation catalysts vital to a broad range of industrial applications.

Noble-Metal Nanocrystals with Controlled Shapes for Catalytic and Electrocatalytic Applications.

Integrating renewable sources into energy system for smart city as a sagacious strategy towards clean and sustainable process

A controller for use in managing an operational lifetime of at least one wind turbine is communicatively coupled to at least one wind turbine and a server sub-system. The controller is configured to receive operational data from the wind turbine, transmit the operational data to the server sub-system, and transmit a request for historical data corresponding to the wind turbine to the server sub-system. The controller is further configured to receive a response from the server sub-system, wherein the response includes historical data corresponding to the wind turbine, and to determine an estimate of a time failure of the wind turbine based on at least one of the operational data and the historical data.

System and method for wind turbine health management

This paper presents a rectifier-less ac–dc energy harvesting circuit capable of harvesting energy from multiple low-voltage piezoelectric transducers (PETs). Synchronous electric charge extraction technique, with bidirectional switches, is adopted to achieve rectifier-less ac–dc direct conversion. The inductor is engaged only during the voltage peak of the PET output for a short period of time and therefore, a single inductor can be shared by multiple transducers. A split-capacitor charging topology is employed to harvest both positive and negative half-cycle energies, without the use of an input rectifier. In addition, a self-startup function is incorporated to kick-start the system from low input voltages. A prototype has been implemented with off-the-shelf components. Energy harvesting from three PET energy sources with different resonance frequencies is demonstrated. A peak overall power conversion efficiency of 79% is achieved with a system self-startup voltage of 650 mV.

A Rectifier-Less AC–DC Interface Circuit for Ambient Energy Harvesting From Low-Voltage Piezoelectric Transducer Array

Fatigue is a dominant failure mechanism of several engineering components. One technique for increasing the fatigue life is by inducing surface residual stress to inhibit crack initiation. In this review, a microstructural study under various bulk (such as severe plastic deformation) and surface mechanical treatments is detailed. The effect of individual microstructural feature, residual stress, and strain hardening on mechanical properties and fatigue crack mechanisms are discussed in detail with a focus on nickel-based superalloys. Attention is given to the gradient microstructure and interface boundary behavior for the mechanical performance. It is recommended that hybrid processes, such as shot peening (SP) followed by deep cold rolling (DCR), could enhance fatigue life. The technical and scientific understanding of microstructural features delineated here could be useful for developing materials for fatigue performance.

Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys.

This paper concerns the quantization effect on an insensitive control law for Lipschitz nonlinear multi-agent systems with quantization information under undirect communication graphs. Quantized insensitive consensus control laws are implementable with quantized values of the relative states by using incidence matrix instead of adjacency matrix. The designed controllers are insensitive to additive interval-bounded controller coefficient variations, where a new technique by converting interval-bounded variation format to norm-bounded uncertain format is proposed to solve numerical problem caused by interval-bounded variations effectively. By taking advantage of tools from non-smooth analysis, explicit convergence results are derived for both uniform and logarithmic quantizers with the aid of linear matrix inequality (LMI) technique. It is pointed out that finite time practical consensus can be achieved when uniform quantizers are used, while consensus can be achieved under some conditions when a logarithmic quantizer is considered. Sufficient conditions of the existence of the proposed control strategy are also obtained by using matrix inequality technique. Simulation example is provided to illustrate the results.

Quantized insensitive consensus of Lipschitz nonlinear multi-agent systems using the incidence matrix

The present invention relates to a wind turbine nacelle having a first face with a longitudinal extension in a wind direction, comprising a cooling device having a cooling area and extending from the first face of the nacelle, and a cover having at least one inner face, the cooling device being enclosed by the first face of the nacelle and the inner face of the cover. A first distance between at least one of the faces and the cooling area is at least 30 mm.

Wind turbine nacelle with cooler top

A wind turbine blade comprises a main blade body and trailing edge section movably connected to the main blade body, and an actuator structure internally within the blade. The actuator interconnects the trailing edge section and the main blade body, and it comprises a stack of a plurality of piezoelectric elements, so that the stack of piezoelectric elements is capable of operating as a linear actuator. The actuator structure is arranged such that it is capable of causing the trailing edge section to move or deform relative to the main blade body in response to aerodynamic loads on the blade. The actuator structure is controllable by a control system applying a voltage to the stack of piezoelectric elements in response to, e.g., detected wind or load characteristics.

Srikanth Narasimalu

Papers

A Rectifier-Less AC–DC Interface Circuit for Ambient Energy Harvesting From Low-Voltage Piezoelectric Transducer Array

Effect of Surface Mechanical Treatments on the Microstructure-Property-Performance of Engineering Alloys.

Quantized insensitive consensus of Lipschitz nonlinear multi-agent systems using the incidence matrix

Wind turbine nacelle with cooler top

Wind turbine blade comprising a trailing edge flap and a piezoelectric actuator