Use Of Rolling Research Articles

Using newspapers for tracking the business cycle: a comparative study for Germany and Switzerland

ABSTRACTThe use of news-based data for tracking the real economy has gained popularity recently as newspapers archives have become accessible and the need for timely information has soared. In this article, on the basis of keyword searches in newspaper articles we construct several versions of the so-called Recession-word Index (RWI) for Germany and Switzerland and exploit its use for forecasting. Our main findings are the following. First, we show that augmenting benchmark autoregressive models with the RWI leads to improvement in accuracy of one-step-ahead forecasts of GDP growth compared with those obtained by benchmark models. Second, the accuracy of out-of-sample forecasts obtained with models augmented with the RWI is comparable to that of models augmented with established economic indicators, such as the Ifo Business Climate Index and the ZEW Indicator of Economic Sentiment for Germany, and the KOF Economic Barometer and the Purchasing Managers Index in manufacturing for Switzerland. Our results are robust to changes in estimation/forecast samples, the use of rolling versus expanding estimation windows and the inclusion of a web-based recession indicator from Google Trends. As our indices are timely and simple to construct, they could be replicated in countries or regions where no reliable economic indicators exist or their provision is very costly.

Influence of Friction on the Loads in a Roll Forming Simulation with Compliant Rolls

Roll forming is an important economic forming process for manufacturing of profiles. For an optimal design of the process, it is important to determine the loads occurring during the forming process. Furthermore, the information of the load behavior enables an evaluation of the formability of the planned profiles with the chosen roll forming machine. An experimental determination of loads in roll forming processes requires a complex measurement setup in combination with a high amount of measurement devices. Hence, the analysis of roll loads by means of finite element simulation is of special interest. The use of roll forming simulations for the determination of geometrical outputs is state of the art. However, due to simplifications, a realistic and reliable output of roll loads in roll forming is impossible. Therefore, the compliance behavior under load and the frictional behavior have to be incorporated in the simulation model. The friction behavior in roll forming processes is presented to be very insignificant in literature. The value of the friction coefficients vary in a broad range. Due to lack of knowledge in the compliance behavior of the used stands, simulation models with rigid rolls are still state of the art. This paper will show the reproduction of realistic roll loads, e.g. torques and forces, in a roll forming simulation. Therefore, the friction coefficients of each roll-sheet metal contact will be gained experimentally and implemented in the numerical model. Furthermore, a characteristic compliance of the roll forming stands will be analyzed and also considered in the simulation. Finally, the influence of changing parameters, e.g. raise of the friction coefficients, on the roll loads will be investigated. To verify the simulation the numerical results will be compared to data gained by experiments.

Study of Deformation's Indexes of Rolls of Different Designs

The elastic deformation of rolls influences the final thickness, thickness variations of strip and distribution of contact stresses. Prospective direction to address the problem of ArcelorMittal Temirtau JSC is the use of new roll materials. Calculating of elastic deformation of four-roll unit of continuous wide-strip hot rolling mill 1700 at ArcelorMittal Temirtau JSC for the actual profile of rolls of the "old", "modern" and "up-to-date" designs. Calculations have showed that during the use of rolls of "up-to-date" design AS1180HH in stands 6-8 bend deflection is reduced by 35-36.8%, and the design of rolls HVS80 in stands 9-12 by 54.5-56.1% that will allow the minimization of strip defect non-flatness at rolling of both narrow and wide strips.

High pressure rolling of low carbon steel weld seams: Part 1 – Effects on mechanical properties and microstructure

One technique for reducing residual stress in welds is high pressure rolling of the weld seam. In this study, a variety of experimental techniques, including microhardness measurements and cross-weld tensile tests with digital image correlation, have been used to characterise the effects of rolling on the mechanical properties and microstructure of the weld material in welded structural steel specimens. It is shown that rolling applied at high temperature, as welding is carried out, promotes the formation of acicular ferrite in the weld metal. This produces a weld material with a greater yield strength and hardness, but slightly reduced impact toughness compared to unrolled welds. Rolling of the weld metal once it has cooled instead causes work-hardening. These effects are discussed as they relate to the use of rolling for weld residual stress reduction.

Step toward robust and reliable amorphous polymer field-effect transistors and logic functions made by the use of roll to roll compatible printing processes

Printed organic electronic is believed to be one of the next major technological breakthroughs in the field of microelectronic. The use of high throughput standard graphic arts printing to process organic field-effect transistors (OFETs) opens promising perspectives for low cost, large area and flexible circuits. Nevertheless, these techniques are commonly known to produce relatively thick (>1 μm) layers and to require complex inks formulations composed of several additives. In this paper, we demonstrate that screen printing and gravure printing may be highly versatile and could be well appropriate to deposit organic semi-conducting layers. These fast “single step” processes combined with amorphous semi-conducting polymer give thin, uniform and reproducible layers. The performances of printed or spin-coated films are similar and lead to robust and reliable full printed transistors and logic functions. Moreover, the capability of screen printing and gravure to deposit small patterns of semiconductor is discussed. Lines and spaces down to 500 μm are reported without specific inks and tools optimizations.

Patterns of legislative politics: roll-call voting in Latin America and the United States

Using the United States as a basis of comparison, this book makes extensive use of roll call data to explore patterns of legislative politics in Argentina, Brazil, Chile and Uruguay. It distinguishes among parties, factions, coalitions and delegations based on the extent to which they are unified in their voting and/or willing to form policy coalitions with other legislative 'agents'. It discusses the voting unity and ballot systems that allow voters to identify an agent, and describes the degree to which those agents have been flexible with regards to the formation of policy coalitions. It also shows that the US parties have exhibited higher levels of unity but less flexibility in recent years, and thus contrast the prevailing pattern in Latin America. The book focuses its explanation for the patterns on the role of candidate nominations, other aspects of the electoral system and the legislators' ideological alignments.

Ramper og stilladser – Løft af store sten i oldtiden

Ramper og stilladser – Løft af store sten i oldtiden

Bookbindings from Nijmegen: 1475-1550

AbstractA group of twenty-four bookbindings from the last quarter of the fifteenth and first half of the sixteenth century can be identified as very likely executed by bookbinders in Nijmegen. Most of these manuscripts and early printed books contain contemporary ownership inscriptions from people or religious institutions in Nijmegen. Most of the bindings were tooled between ca. 1475 and 1527 with characteristic separate tools whose impressions appear on the bindings in different combinations. The fastenings and the penwork added by hand also support the assignment of these bindings to a single group. Around 1527, the binders switched to the use of rolls, still found in use as late as 1548.

Processes of interaction on the interface of a bimetal billet produced by the method of rolling unsintered powder

1. The use of rolling as a method of compacting of powder bimetal green parts provides the obtaining of a dense structure of the powder metallurgy steel and a high-quality joint between the layers as a result of pressing of particles of the 10R6M5-MP high-speed steel powder into the material of the U10A steel core and also as a result of the combined deformation at high temperatures. 2. With a practically equal carbon content in the two steels migration of carbon into the high-alloy steel, with the formation of a zone of decreased hardness, is observed after heat treatment as a result of the increased residual austenite content.

Use of rolling to increase the service life of the rolling bodies of drill bits

Use of rolling to increase the service life of the rolling bodies of drill bits

Experience in the use of rolls

Experience in the use of rolls

The use of rolls built up by welding

The use of rolls built up by welding