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The Loran-C system is an internationally standardized positioning, navigation, and timing service system. It is the most important backup and supplement for the global navigation satellite system (GNSS). However, the existing Loran-C signal acquisition methods are easily affected by noise and cross-rate interference (CRI). Therefore, this article proposes an envelope delay correlation acquisition method that, when combined with linear digital averaging (LDA) technology, can effectively suppress noise and CRI. The selection of key parameters and the performance of the acquisition method are analyzed through a simulation. When the signal-to-noise ratio (SNR) is −16 dB, the acquisition probability is more than 90% and the acquisition error is less than 1 μs. When the signal-to-interference ratio (SIR) of the CRI is −5 dB, the CRI can also be suppressed and the acquisition error is less than 5 μs. These results show that our acquisition method is accurate. The performance of the method is also verified by actual signals emitted by a Loran-C system. These test results show that our method can reliably detect Loran-C pulse group signals over distances up to 1500 km, even at low SNR. This will enable the modern Loran-C system to be a more reliable backup for the GNSS system.

A perimeter intrusion detection system (PIDS) is critical for the security of a shale gas field. Among many technologies, the fiber optic sensor-based method is the most widely used, due to its passive, low-cost, long-life, and strong anti-interference ability and strong environmental adaptability. This article proposes an event detection and classification method for a fiber optic PIDS. In general, three types of features are extracted for an improved double-threshold method to improve the probability of detection. Also, the detected intrusion events are distinguished by a support vector machine with wavelet features to reduce the nuisance alarm rate. Experiments on the PIDS in Chongqing Fuling's shale gas field show that detection algorithms based on the feature of short-time energy and short-time wavelet coefficient energy are much better, and the performance of event classification is satisfactory.

This chapter contains sections titled: Introduction Determination of ΔG ii ‡ (fit) Values Why is the Success of Cross‐Rate Theory Surprising? Major Factors Determining Intrinsic Reactivities of Hydrazine Couples Nonhydrazine Couples Comparison of ΔG ii ‡ (fit) with ΔG ii ‡ (self) Values Estimation of H ab from Experimental Exchange Rate Constants and DFT‐Computed λ Comparison with Gas‐Phase Reactions Conclusions References

This chapter presents chart studies incorporating much of the technical behavior already discussed. Some new material is also included. Instead of focusing individually on absorption or springs, it's all put together. A chart is presented and questions posed where something is about to happen.

Opportunities for mean reversion strategies in currencies and futures are limited but not nonexistent. This chapter will guide the reader toward those situations where mean reversion occurs, such as the trading of futures calendar spreads. In addition, we will discuss a trading strategy for one unique futures intermarket spread: the volatility future versus the stock index future. We will also discuss a simple mathematical model of futures prices that will illuminate concepts such as spot versus roll returns and backwardation versus contango. Understanding this model will help suggest new futures trading strategies without resorting to ad‐hoc technical indicators.

A rejoinder to Prof. Bresciani-Turroni’s reply to the author’s article on the problem of the concordance of direct exchange rates and cross-rates under a system of bilateral trade.   JEL: F10, F31

The article makes a contribution to the problem recently raised, by Prof. Bresciani-Turroni and Prof. Gini, about the concordance of direct exchange rates and cross-rates under a system of bilateral trade. The author summarises the two theses and illustrates their terms. He goes back to the solution given by Walras and calls attention to the additional unnecessary hypotheses, whose introduction into the demonstration has given rise to divergent conclusions. JEL: F10, F31

A comment on Dr. Gioacchino d’Ippolito’s article on the problem of the concordance of direct exchange rates and cross-rates under a system of bilateral trade.   JEL: F10, F31

A reply to Dr. Gioacchino d’Ippolito’s article on the problem of the concordance of direct exchange rates and cross-rates under a system of bilateral trade.   JEL: F10, F31