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Because Schlieren optical systems (e.g. essential for density gradients with steep refractive index gradients) are commercially not available a homemade system has been developed by transferring the existing Schlieren optics of a Beckman model E analytical ultracentrifuge to a preparative Beckman Optima XL analytical ultracentrifuge with an eight-cell multiplexer. In this paper we describe the expansion...
Because Schlieren optical systems (e.g. essential for density gradients with steep refractive index gradients) are commercially not available a homemade system has been developed by transferring the existing Schlieren optics of a Beckman model E analytical ultracentrifuge to a preparative Beckman Optima XL analytical ultracentrifuge with an eight-cell multiplexer. In this paper we describe the expansion...
The large scale penetration of electric vehicles (EVs) will introduce technical challenges to the distribution grid, but also carries the potential for vehicle-to-grid services. Namely, if available in large enough numbers, EVs can be used as a distributed energy resource (DER) and their presence can influence optimal DER investment and scheduling decisions in microgrids. In this work, a novel EV...
Even as distributed generation and distributed energy resources (DER) become a more appealing option to meeting building electricity, heat, and cooling demands, the process of selecting the appropriate equipment mix remains as a complex and time-consuming obstacle. This is the motivation behind Lawrence Berkeley National Laboratory's (LBNL) development of WebOpt, a flexible web-based software as service...
Present work shows results obtained during an investigation of front-end part for ultra wideband (UWB) transceiver. Main topic is focused on the hardware supporting European standard that assumes the use of the total UWB frequency band with 5GHz band (4.8–6.3 GHz) cut-off. Typical realization of the front-end part uses single full-band antenna, bandpass filter (BPF) and bandstop filter (BSF). The...
Connecting electric storage technologies to smartgrids will have substantial implications in building energy systems. Local storage will enable demand response. Mobile storage devices in electric vehicles (EVs) are in direct competition with conventional stationary sources at the building. EVs will change the financial as well as environmental attractiveness of on-site generation (e.g. PV, or fuel...
A novel ultra wideband (UWB) power divider is proposed in this paper. A design of the power divider is based on coupled transmission lines and it has been implemented using low temperature cofired ceramic (LTCC) technology. The power divider provides a function over the whole UWB bandwidth (3.1 – 10.6GHz). In contrary to commonly used coupled line splitters, the design doesn't requires infinite increasing...
A new balanced triplexer design has been presented in this paper. The triplexer is intended for using in triple-band front-end modules for WiMAX applications. The design implements full integration of the receive path (RX) including channel separating with following balancing of its. Proposed triplexer design procedure provides an essential size reduction in comparison with existing similar products...
Cascaded filters offer a possibility to minimize the size of the filter components due to their increased attenuation at high frequencies. A cost optimized design of a cascaded filter of a multi-phase converter for an automotive energy backup system will be shown, that results in small values of the inductances. However, the decreasing inductance values results in increasing current ripples in the...
Tolerance parameters limit the ripple cancellation phenomenon of an interleaving concept in multiphase converters. An analysis has been performed to demonstrate that coupled inductors help to reduce the influence of non-uniform inductances. Non-equal duty cycles and non-ideal phase-shifts are therefore more problematic in multi-phase converters with coupled inductors. This paper presents a control...
The distributed energy resources customer adoption model is used to estimate the value an Oakland nursing home, a Riverside high school, and a Sunnyvale data center would need to put on higher electricity service reliability for them to adopt a consortium for electric reliability technology solutions microgrid (CM) based on economics alone. A fraction of each building's load is deemed critical based...
Progress in electronic component production has enabled a scaling-down of circuit layouts over the past years while realizing similar functionalities. Driven by the ldquoneed for speedrdquo, data transmission rates and therefore signal frequencies have increased throughout electrical circuits in new applications. Both trends mean that circuit operation becomes more sensitive with respect to signal...
Actual trend in microwave electronics lies in miniaturization of electronic components with remaining or even improving of its characteristics. A new conception of filter design considering this requirement is presented in the paper. Size reduction is provided using of both LTCC (low temperature cofired ceramic) multilayer technology and system solutions. The filter design is based on transversal...
This paper deals with the characterization of LTCC substrates up to 100 GHz. Planar transmission lines and resonators are used for characterizing the substrates. Measurement results for the relative permittivity obtained from the investigated structures are presented.
A matching technique which simultaneously fulfills 2 tasks, matching and enhancement of the operation frequency band, is presented in this paper. As an example, matching for a 5-band mobile phone (GSM 850, GSM 900, GSM 1800, GSM 1900 and WCDMA 2100) has been examined. Two very simple inverted-L antennas with input impedances in range of 2 - j10 to 10 + j20 Ohms with two matching circuits are used...
A novel auxiliary circuit with a current controlled non-linear inductor has been developed to achieve soft-switching for different converter topologies. This paper outlines the operation principle of the auxiliary circuit and gives details about the control of the non-linear inductor. A model has been developed that allows the calculation of the control current dependent on the operating point of...
A novel zero voltage switched multi-phase converter for the 42V/14V automotive electrical power system has been built and tested. The efficiency of the converter was a main target and switching losses have been reduced using non-linear inductors to achieve zero voltage switching. In comparison to resonant converters with non-linear inductors, the load current is not flowing through the non-linear...
The deployment of small (<1-2 MW) clusters of generators, heat and electrical storage, efficiency investments, and combined heat and power (CHP) applications (particularly involving heat activated cooling) in commercial buildings promises significant benefits but poses many technical and financial challenges, both in system choice and its operation; if successful, such systems may be precursors...
On-site cogeneration of heat and electricity, thermal and electrical storage, and curtailing/rescheduling demand options are often cost-effective to commercial and industrial sites. This collection of equipment and responsive consumption can be viewed as an integrated energy system (IES). The IES can best meet the site's cost or environmental objectives when controlled in a coordinated manner. However,...
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