An environmental survey relating to improvised and emulsion/gel explosives

The detection and identification of traces of inorganic ions and sugars can play a major role in the forensic investigation of an explosives related incident. This survey investigated the background levels of these substances in the general environment. Six sampling locations were selected from around the mainland of the United Kingdom, representing urban and rural sites. Swab and vacuum samples were collected from different locations within each site including motor vehicles, private houses, hotels, the exterior of buildings, road surfaces, and street signs. Sampling was carried out in summer and winter to investigate changes in the levels of the target species due to seasonal factors such as road treatments or weather. The samples were extracted with water and analyzed for a range of inorganic anions, cations, and sugars using ion chromatography. Most of the target anions were found to be common to all locations. Chloride, sulphate, nitrate, and phosphate were found to be the most common and the most abundant. Chlorate was found at a low level in some external samples. Perchlorate and thiocyanate were not detected in any samples. There was a marked increase in the quantity of sodium and chloride detected in samples collected during the winter. Sodium and calcium were detected in most samples. Potassium and magnesium were detected in approximately half of the samples. Ammonium was less common but detected at significant levels in wall samples. Glucose, fructose, and sucrose were detected in the vacuum samples from the interior surfaces of houses, hotels, and cars.     

States and their international relations since 1816: introducing version 2 of the International System(s) Dataset (ISD)

ABSTRACT

We introduce version 2 of the International System(s) Dataset (ISD), a register of sovereign states across the 1816–2016 period that include numerous states that are missed in commonly used datasets like the Correlates of War (COW) Project. Whereas ISD version 1 identified 363 states between 1816 and 2011, version 2 identifies 482. This version also records valuable information on a range of corollary variables, including start dates, end dates, estimated population sizes, diplomatic relations with Europe, conflict episodes, the existence of borders, and the location of capital cities. This dataset makes an important contribution to the study of international relations. It provides a more accurate understanding of the development of the international system over the last two centuries, it moves beyond the Eurocentric bias that sits at the heart of existing quantitative IR scholarship, and it will enable scholars to pursue a range of research topics such as the historical importance of state borders and boundaries, the practices surrounding recognition, and the frequency and intensity of conflict across regions. In this article, we discuss the existing state system membership lists and show how the ISD addresses their shortcomings. We outline the key concept and operationalization of statehood that the ISD adopts. We detail the variables included in this version of the ISD, discuss the data collection process, and show temporal and spatial distributions that illustrate the uniqueness of the ISD. Finally, we demonstrate the utility of bringing the ISD into one of many potential research topics: the study of conflict.