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Among langasite type crystals, La3Ga5.5Ta0.5O14 (LGT) and Ca3TaGa3Si2O14 (CTGS) possess relatively high resistivity (>106Ωcm@600°C) and high effective piezoelectric coefficient (6–8 pC/N) at elevated temperatures, exhibited the potential use for high temperature sensing. In this work, the maximum piezoelectric coefficients and piezoelectric cross-talk behaviors for LGT and CTGS crystals are investigated,...
Pyroelectric properties of oxyborate crystals with monoclinic structure, including ReCa4O(BO3)3 (ReCOB, Re: rare-earth elements) and BiB3O6 (BiBO), were investigated by charge integration method. The pyroelectric p1 of ReCOB crystals was found to be negative, being on the order of −59.3∼−65.5μC/(m2·°C) at 30°C, while the pyroelectric p3 was determined to be positive, being around 11.6∼31.0μC/(m2·°C)...
A novel dynamic multi-stage ESM (Energy-Saving Management) mechanism based on BS (Base Station) cooperation is proposed. The mechanism firstly introduces a local OP (Opposite Pair) cooperation method taking account of geographic topology and then divides time period into four domains. In time domains, regional dynamic multi-stage algorithms and efficient performance evaluation model for the mechanism...
An increasing number of security incidents on industrial control systems drew a lot of concerns lately. Many attacks involved multiple attack vectors similar to internet attacks. However, CPS are more vulnerable to attacks. To evade detection, a hacker may apply multiple attack stages to gain the access to a control system. For example, he first employs a group of zombies (compromised machines) to...
In most applications of through-wall imaging (TWI) radar, target positioning has attracted more attentions than electromagnetic (EM) wave propagation. And the special application also provides a possibility for applying the bran-new theory, known as compressive sensing (CS), to TWI. However, due to the high sensitivity of CS in model error, the approximate propagation model which is widely used by...
The traditional satellite ground communication system is generally of parabolic antenna in most cases, but this kind of antenna has the disadvantages of poor flexibility and large volume; while microarray antenna has the shortcomings of large loss and small gain. In this paper, a novel waveguide horn antenna is designed. The radiation layer was is conductor with a octagonal hole in the center, the...
With the development of embedded systems, more and more applications require large and high speed memory. The FPGA-based solution also faces the same demand. Design and realization of an external storage with large capacity and high throughput in the FPGA-based embedded system is becoming a challenge. To satisfy the practical requirement, a DDR2 controller design is proposed, which efficiently and...
In this paper we present an autonomous load balancing algorithm for downlink LTE network, the ripple form reference signal received power based load balancing algorithm (RF-RSRPBLBA), which mainly requires the reference signal received power (RSRP) and cell load information. In RF-RSRPBLBA, overloaded cells distribute their surplus load in a greedy manner. As a general character of greedy algorithm,...
In this paper we come up with a division method of station operating period, and describe a distributed energy saving mechanism based on X2AP which stepwise turns off stations. We also propose a method to evaluate energy efficiency. To verify our proposed mechanism, we used data collected from practical network of four regions in simulation. The result shows that our mechanism can achieve better energy-saving...
Aiming to resolve insufficiency of existing Energy-Saving (ES) methods in heterogeneous network, a novel self-organizing ES mechanism to improve energy efficiency suitable for heterogeneous networks is proposed. In the mechanism, we come up with the self-organizing procedures, the traffic model, and an optimizing objective model. The mechanism is then simulated under an urban LTE scenario with 7 macro...
Near-term output forecast of wind electric generators (WEG) has uncertainties. Optimal power flow (OPF) schedules that consider forecasted output of WEGs carry risk due to these uncertainties. This risk can be quantified as expected energy not served (EENS). Traditional methods such as Monte Carlo simulation (MCS) with OPF can capture the stochastic nature of WEG output while considering ac transmission...
Cell outage is the total loss of radio services in the coverage area of a cell. Aiming at mitigating the coverage problems caused by a sudden outage, this paper proposed a concrete cell outage compensation scheme based on immune algorithm. Taking into account the two objectives, coverage and quality, the scheme constructs a mathematical model which adjusts the uplink target received power in surrounding...
In the Retrieval System, the query words correction is an important auxiliary in improving query efficiency. In this paper, according to the characteristics of the Chinese language, a candidate set has been generated for each term of the query string. After the cross combination of the candidate sets, the grid of candidates is created. With the characteristic form combining the factor of n-gram statistical...
We present one-dimensional photonic crystal waveguides which can stably trap neutral atoms and achieve single-atom reflectivities of ro ≳ 0.9, as well as experimental progress towards fabrication and optical testing of such structures.
According to the low-efficiency and high-cost situation of warehouses operation, which exists in logistics industry, this paper proposes a scheduling model of vehicles in warehouses based on genetic algorithm. The host PC can realize the scheduling of vehicles by genetic algorithm. And simulation confirms reliability and efficiency of scheduling. Experiments illustrate that this scheduling model efficiently...
Evolving power systems are facing diverse supply mixes and increasing addition of renewable resources, like wind power. Due to stochastic feature of wind, output of wind electric generators (WEG) has uncertainties. These uncertainties bring risks into daily power system operations. Flexible and accurate computational tools are increasingly needed to handle the uncertainties for generation planning...
High temperature piezoelectric crystals, YCa4O(BO3)3 (YCOB) possess relatively high piezoelectric activities (deff = ∼7.8pC/N, keff= ∼19%) and no phase transition prior to the melting point (∼1500°C), indicating the potential use for high temperature sensing. In this work, growth of YCOB single crystals by using Czochralski (Cz) method was introduced and the temperature dependence of electro-elastic...
The substation communication network based on the conventional Switched Ethernet is not deterministic. Applying AFDX, this paper presents a novel Switched Ethernet architecture, of which the latency up bound is calculable rather than probabilistic. Besides, the theoretical analysis and network simulation based on a worst case of substation fault are launched and the latency up bound of each message...
In order to assure the high efficiency and accuracy of dealing with emergency incidents, it's the essential factor of dispatching the materials and human resource in time. Electronic image hotspot map can visually present the status of resources scheduling in different areas. AJAX engine can make a bridge between client side and server side. Furthermore, it makes the separation of web-page and application...
For the sake of the increase of energy consumption, the emission of carbide can't be negligible. In this paper, we propose a mathematical model which adjusts the radius of base station, to figure out the problem of energy saving, while the quality of services such as the traffic volume of each base station and the service area should be satisfied. For the model, we use ant colony algorithm as a practical...
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