A worldwide model for boundaries of urban settlements

The shape of urban settlements plays a fundamental role in their sustainable planning. Properly defining the boundaries of cities is challenging and remains an open problem in the Science of Cities. Here, we propose a worldwide model to define urban settlements beyond their administrative boundaries through a bottom-up approach that takes into account geographical biases intrinsically associated with most societies around the world, and reflected in their different regional growing dynamics. The generality of the model allows to study the scaling laws of cities at all geographical levels: countries, continents, and the entire world. Our definition of cities is robust and holds to one of the most famous results in Social Sciences: Zipf's law. According to our results, the largest cities in the world are not in line with what was recently reported by the United Nations. For example, we find that the largest city in the world is an agglomeration of several small settlements close to each other, connecting three large settlements: Alexandria, Cairo, and Luxor. Our definition of cities opens the doors to the study of the economy of cities in a systematic way independently of arbitrary definitions that employ administrative boundaries

The Egyptological afterlife of Colin Campbell

No abstract available

Survival Analysis in Tourism Demand: The length of stay in Latin American destinations

This article analyses the determinants of the length of stay of Portuguese tourists taking vacations in Latin America, based on a questionnaire distributed on flights of a Portuguese charter airline, Air Luxor. A survival model is adopted to measure the relationship between vacation length and covariates. It is concluded that the most affluent tourists, who are motivated by culture, climate and security, will have the longest stays. The policy implication is derived.duration models; heterogeneity; tourism; Latin America.

The Terrorist Attack in Kunming, China: Does It Indicate a Growing Threat Worldwide?

At 9:00 pm on March 1, 2014, six men and two women, dressed in black and wielding knives, arrived at the Kunming train station, one of the largest in southwest China, and began slashing people at random. Before authorities could stop them, the assailants had killed 29 people and wounded another 143. It was the second worst terrorist attack in the history of the People’s Republic of China, not including a series of bombings in Shijiazhuang in 1998, which killed 108 people. These, however, were carried out for personal, not political reasons. It was also China’s second most lethal transportation attacks

Harmonic current extraction of shunt active power filter based on prediction current technique - Hysteresis PWM

Due to the wide spread of power electronics equipment in modern electrical systems, the increase of the harmonics disturbance in the ac mains currents has became a major concern due to the adverse effects on all analysis and simulation using MATLAB-SIMULINK of a three-phase shunt active equipment. This paper presents the Shunt Active Power Filter (SAPF) to compensate the generated harmonics by 3-phase Rectifier Bridge fed R-L load. The harmonic current extraction is based on prediction current extraction technique -hysteresis PWM generation pattern

How Do Tourists React to Political Violence?: An Empirical Analysis of Tourism in Egypt

This paper uses a detailed database of political violence in Egypt to study European and US tourists' attitudes towards travelling to a conflict region. We use time series analysis to study the heterogeneous impacts of different dimensions of political violence and counter-violence on tourist flows to Egypt in the 1990s. We find that both US and EU tourists respond negatively to attacks on tourists, but do not appear to be influenced by casualties arising in confrontations between domestic groups. However, European tourists are sensitive to the counter-violence measures implemented by the Egyptian government. There is also evidence of tourism in Egypt being affected by the Israeli / Palestinian conflict, with arrivals of tourists into Egypt rising when fatalities in Israel increase.Tourism, political violence, Egypt

Neutrino Mass Matrix Subject to μ−τ\mu-\tau Symmetry and Invariant under a Cyclic Permutation

Neutrino masses arise via a seesaw mechanism and its mass hierarchy, with assumption that heavy Majorana neutrino mass matrix subject to $\mu-\tau$ symmetry and invariant under a cyclic permutation, are evaluated. Within this scenario, the neutrino masses: $\left|m_{1}\right|=\left|m_{2}\right|<\left|m_{3}\right|$ are obtained, which are incompatible with the experimental data. By modifying neutrino mass matrix with the zero sum rule condition, the neutrino masses in inverted hierarchy: $\left|m_{3}\right|<\left|m_{1}\right|<\left|m_{2}\right|$ are obtained.Comment: 6 pages, Talk given at CTP BUE International Conference on Neutrino Physics in the LHC Era, Luxor, Egypt, 15-19 November 200

"Asiatic" copper in New Kingdom Egypt

This work presents a combination of Lead Isotope Analysis ( LIA ) and ancient Egyptian texts and depictions in order to describe the history of the ox -hide copper ingots presence in Egypt , which w ere called by the Egyptians “Asiatic copper”. Ox-hide ingots in Egypt represent a particular case where the information given by ancient sources and modern chemical analyses might be combined in order to establish the provenance of archaeological objects and the hist ory of a particular m aterial during the Bronze Age. Ox -hide ingots arrived to Egypt where the first kings of the Egyptian New Kingdom developed an impressive building program through the entire country and needed a supply of copper and other materials. The “Asiatic copper” was depicted in different tombs and temples from the 18 th to the 20 th dynasties in Thebes and Amarna. According to depictions and texts, three different regions supplied copper according to ancient Egyptians: Syria, Cyprus and Crete. Howe ver, the LIA of the lead present in mined copper permits to establish that the ingots were made of copper from Apliki mines, in Central Cyprus. The depictions in Egyptian tombs and temples probably represented not only the actual region of provenance but a lso the peoples involved in the trade, because t he ingots were traded by Syrian merchants following a route that passed Syria, Cyprus, Crete and GreecePostprint (published version