Shape ellipticity based on the first Hu moment invariant

In this paper we use the first Hu moment invariant to define a new ellipticity measure. The new ellipticity measure ranges over the interval $(0,1]$ and picks the value 1 if and only if the measured shape is an ellipse. The measure is invariant with respect to translation, rotation and scaling transformations. It is straightforward and fast to compute.     

Efficient method for lossless LIDAR data compression

Light Detection and Ranging (LIDAR) has become one of the prime technologies for rapid collection of vast spatial data, usually stored in a LAS file format (LIDAR data exchange format standard). In this article, a new method for lossless LIDAR LAS file compression is presented. The method applies three consequent steps: a predictive coding, a variable-length coding and an arithmetic coding. The key to the method is the prediction schema, where four different predictors are used: three predictors for x, y and z coordinates and a predictor for scalar values, associated with each LIDAR point. The method has been compared with the popular general-purpose methods and with a method developed specially for compressing LAS files. The proposed method turns out to be the most efficient in all test cases. On average, the LAS file is losslessly compressed to 12% of its original size.     

Fighting Cancer with Bacteria and Their Toxins

Cancer is one of the most important global health problems that continues to demand new treatment strategies. Many bacteria that cause persistent infections play a role in carcinogenesis. However, since bacteria are well studied in terms of molecular mechanisms, they have been proposed as an interesting solution to treat cancer. In this review, we present the use of bacteria, and particularly bacterial toxins, in cancer therapy, highlighting the advantages and limitations of bacterial toxins. Proteomics, as one of the omics disciplines, is essential for the study of bacterial toxins. Advances in proteomics have contributed to better characterization of bacterial toxins, but also to the development of anticancer drugs based on bacterial toxins. In addition, we highlight the current state of knowledge in the rapidly developing field of bacterial extracellular vesicles, with a focus on their recent application as immunotherapeutic agents.     

Experimental investigation and thermodynamic calculation of the Cu–In–Sb phase diagram

The phase diagram of the Cu–In–Sb ternary system is of importance in predicting the interface reaction between In-based solder materials and the Cu substrate.     

Zero—a blend of static typing and dynamic metaprogramming

Zero is an experimental statically typed, fully object-oriented reflective programming language. Reflective features cover introspection as well as structural and behavioural reflection. The reflective facilities include safe method and class replacements and detailed modification of methods. These enable Zero programs to quickly accommodate to run-time requirements. Behavioural reflection is realised using handlers (hooks), which may be attached to all language constructs based on closures. Zero provides an efficient static typing system with run-time extensions. Methods are first class values and are represented as objects when such representation is required. By using such representation, Zero provides elegant use of statically typed higher-order methods.     

Die Betriebsphasenimpedanzen eines dreiphasigen Leitersystems als Folge des Leistungsaustausches zwischen den Phasen

Übersicht Dies ist die erste von zwei Abhandlungen, welche sich mit der Ermittlung der elektromagnetischen Eigenschaften von Dreiphasenleitersystemen mit hohen Strömen befassen. Die Verfasser zeigen analytisch an einem einfachen Beispiel, bei welchem jede Phase nur einen Leiter hat, wie die Phasenströme und-Spannungen, die Phasenimpedanzen, die Verlustleistungen und die Unsymmetrien des Leitersystems ohne Nulleiter bestimmt werden. Besonderer Wert wird auf die Abhängigkeit der Phasenimpedanzen von der Last und auf die Erklärung der phyksialischen Verhältnisse in einem solchen Leitersystem gelegt.

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Contents This is the first of two articles which deal with the determination of the electromagnetic properties of three-phase conducting systems with high currents. The authors show analytically trough a simple example, each phase having only one conductor, the determination of the phase currents and tensions, the phase impedances, the loss energy and the asymmetrics of a conducting system without zero conductor. There is especially emphasized the dependency of the phase impedances from the load and the explanation of the physical conditions in such a conducting system.

     

Bestimmung der Betriebsphasenimpedanzen in einem Dreiphasenleitersystem mit verzweigten Leitern

Übersicht In dieser Abhandlung werden der analytische Weg und die zahlenmäßige Berechnung der Phasenströme, Phasenspannungen und Phasenimpedanzen im Dreiphasenleitersystem ohne Nulleiter mit großen Strömen gezeigt, in dem jede Phase aus mehreren elektrisch parallel geschalteten Leitern besteht. Die Energiebilanz wird aufgestellt und die Energieverluste des Leitersystems werden berechnet.

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Contents In this article the analytical method and the numerical calculation are shown of the phase currents, of the phase tensions and of the phase impedances in a threephase conductor system without zero conductor and with branched conductors. The energy balance is set up and the energy losses in the conductor system are calculated.