Revealing Comparative Advantage: Chaotic or Coherent Patterns Across Time and Sector and U.S. Trading Partner?

We map United States comparative advantage between 1980 and 1995, by trading partner and region, using Balassa's export-based index of Revealed Comparative Advantage (RCA). We find: temporally stable and ubiquitous US comparative advantage in differentiated producer goods (except disadvantage in Japan); somewhat less stable and less sweeping US disadvantage in standardized producer goods; chaotic and diverse patterns of US RCA in consumer goods (especially in the Chinese market). Our most significant findings are surprisingly sharp geographical differences in patterns of US RCA and surprisingly small differences across sub-sectors of 1, 2, and 3-digit SITC classifications - regional, but not sectoral, niche' specialization. The high overall variability across regions in RCA indexes seems unrelated to obvious explanations such as proximity or lingual/historical ties to the US. In producer goods, RCA variability across regions correlates somewhat better with accounts of trade diversion and of regional preferences for and discrimination against US exports. We find only scant evidence of high or increasing variability across disaggregated commodity sub-groups in US RCA indexes. Such variability is often the prediction of theories of comparative advantage that are based on vertical specialization, product differentiation, or scale and agglomeration economies.

An application of decision trees method for fault diagnosis of induction motors

Decision tree is one of the most effective and widely used methods for building classification model. Researchers from various disciplines such as statistics, machine learning, pattern recognition, and data mining have considered the decision tree method as an effective solution to their field problems. In this paper, an application of decision tree method to classify the faults of induction motors is proposed. The original data from experiment is dealt with feature calculation to get the useful information as attributes. These data are then assigned the classes which are based on our experience before becoming data inputs for decision tree. The total 9 classes are defined. An implementation of decision tree written in Matlab is used for these data

COMPUTER METHODS FOR ANALYSIS AND OPTIMIZATION OF ENERGY COMSUMPTIONS

The implementation of sustainable development in Romania and the abrupt increase of prices for fussil fuels have imposed more serious activies for the examination of the energy consumption in different industrial sectors. Here, the asynchronous electric menergy efficiency, electric drive, energy balance, power factor, informatic instruments.

THE INVOLVEMENT OF INFORMATION TECHNOLOGY IN THE OPTIMAL FUNCTIONING OF ELECTRIC DRIVE SYSTEMS

The implementation of sustainable development in Romania and the abrupt increase of prices for fussil fuels have imposed more serious activies for the examination of the energy consumption in different industrial sectors. Here, the asynchronous electric motors represent the main loads; therefore the energy consumption in electrical drives has to be careffuly watched. The achievement of various procedures to improve energy efficiency, compulsory imposes an energy balance who aims to illustrate the existent profile of energy consumption . The study presents an industry case study about estimation of operating systems functioning that use variable speed motors, highlighting the necessity and appropriateness of using informatic instruments that provide calculations needed to elaborate energy balance and by that, to determine the measures to increase energetic efficiency.energy efficiency, electric drive, energy balance, power factor, informatic instruments

Applied magnetic : its rapid revolution.

A magnet in general is material that produced, or is operated by means of magnetism. The way materials respond at microscopic level to an applied magnetic field is known as magnetism. The magnetic field is invisible but is responsible for the most notable property of magnetism in producing force so that different poles will attract to each other while similar poles will repel each other. The source of magnetism can be found in a permanent magnet and a conductor that is applied by an electric current. This means that the electrical energy can be converted to the magnetic energy without any medium of transmission. Such relationship makes magnetics capable of producing mechanical energy from an electrical energy such as motors, solenoids and actuators. Vice versa, electrical energy can also be produced from the mechanical energy. The use of electromagnetic principle is more superior compared with other automation principles such as hydraulics since it is cleaner and easier to be controlled for a fast response. The revolution of this field has innovated commercial products such as pumps. compressors, fans, blenders. cutters, drillers, crushers, printers, rollers, etc. Thus, electromagnetics has emerged in a new era where everyone is talking about efficiency and energy consumption plus being environmental friendly and less costly innovations

Analisa Pengaruh Jenis Mechanical Seal Terhadap Unjuk Kerja Pompa Sentrifugal

Minyak bumi merupakan senyawa hidrokarbon yang dihasilkan dari sisa-sisa hewan atau fosil yang telah mati dan tertimbun selama berjuta-juta tahun yang lalu. Dalam waktu yang sangat lama bahan-bahan tersebut tertimbun oleh bebatuan sedimen, dan akibat dari proses kimia dan fisika serta adanya tekanan dan temperatur yang tinggi maka terbentuklah minyak mentah. Minyak mentah yang terdapat didalam Perut bumi tidak keluar dengan sendirinya, untuk itu diperlukan alat pendukung yang tepat digunakan seperti pompa. Pompa yang dimaksud disini adalah pompa yang digunakan untuk menginjeksikan air panas kedalam Perut bumi. Pompa yang sering digunakan adalah pompa sentrifugal. Pompa sentrifugal memiliki salah satu komponen yang penting yaitu mechanicalseal. Mechanical seal adalah suatu komponen dalam sebuah konstruksi pompa yang berfungsi sebagai penghalang atau pengeblok keluar masuknya cairan, baik itu fluida proses maupun pelumas. Penggunaan jenis mechanical seal yang tepat sangat penting bagi unjuk kerja pompa sentrifugal. Untuk itu perlu diteliti pengaruh jenis mechanical seal terhadap unjuk kerja pompa sentrifugal. Tujuan penelitian ini adalah untuk mengetahui pengaruh jenis mechanical seal terhadap unjuk kerja pompa sentrifugal. Selain itu untuk mengetahui jenis mechanical seal yang paling baik unjuk kerjanya. Penelitian ini dilakukan secara eksperimen dengan menguji pompa sentrifugal yang menggunakan jenis mechanical seal plan 11, plan 21, dan plan 23. Dari hasil pengujian diperoleh bahwa jenis mechanical seal memiliki pengaruh terhadap unjuk kerja pompa sentrifugal. Jenis mechanical seal yang paling baik unjuk kerja pompa sentrifugalnya adalah jenis mechanical seal Plan 23. Dimana jenis mechanical seal plan 23 memperoleh effisiensi yang paling tinggi dari jenis mechanical seal yang lain, yaitu sebesar 70 %. Sedangkandaya pompa yang diperoleh paling rendah dari jenis mechanical seal yang lain, yaitu sebesar 135 HP. Dan untuk temperaturnya mechanical seal ini paling rendah, yaitu sebesar 84,2

BILATERAL TRADE TRENDS AND PATTERNS OF BOSNIA AND HERZEGOVINA: CASE OF TRADE WITH TURKEY

A country’s trade pattern reflects its supply (export) and demand (import) specialization indicating national performance and competitiveness in the foreign as well as in the domestic market. By applying two different concepts of trade specialization (one based on traditional trade theories of comparative advantages and the other based on modern trade theories), complemented with analysis of export-import flows and relations, the paper aims to identify characteristics of the position of Bosnia and Herzegovina (BiH) in its bilateral trade. The paper investigates trends, patterns and variations in trade of BiH with Turkey during the eleven-year time frame (2009-2019), with a special regard to identifying industries with revealed comparative advantages and industries with dominancy of IIT. The analysis employs different indicators such as indices of export composition, sectoral diversification/concentration, IIT intensity and structure, quality of exports and imports based on relative unit values and classification of industries by technological intensity. The research results indicated an unfavourable position of BiH in trade with Turkey, with no prominent changes in the observed period. Trade deficit is constantly present, with low export-import coverage and a declining export trend. The analysis revealed a higher level of export product concentration primarily on low value added products, and comparative advantages of BiH in fewer industries, mainly resource-based or medium-technologically intensive. Trade with Turkey is extremely inter-industry trade, viewed both at aggregate and industrial level, also pointing to BiH's low competitiveness in analyzed trade relations

CHARACTERIZATION OF A STRUCTURE- BORNE SOURCE USING THE RECEPTION PLATE METHOD

This paper presents the characterization of vibration strength obtained from reception plate method by applying the mobility concepts. It describes a laboratorybased measurement procedure, which determines the strength of a vibration source in terms of the total squared free velocity of the source. The source used in the experiment is the small electric fan motor installed on high mobility aluminum panel in order to neglect the influence of the source mobility. The complexity of the mobility at the contact points are reduced using the single value of effective mobility. The aim is to validate the data obtained from the reception plate method with one from the direct measurement. Thus, this research is expected to give a simple but accurate way to determine input power from a structure-borne sound source

Model of the decision-making system for assessment of the state of technical objects

The most wear-out is production equipment with rotary motion (turbines, generators, motors, gearboxes, pumps, compressors, fans, etc.). It is possible to reduce the cost of its operation by introducing modern maintenance systems, which are based on the use of technologies for monitoring, assessing the condition, diagnosing, predicting the development of defects, which, in terms of their organization and functioning, are intelligent systems. The state of the observed technical objects is determined by the parameters and characteristics. The aim of the work is to develop a model of the basic element of the decision-making system and consideration of options for its practical application. The proposed model of the basic element of the decision-making system allows you to create various structures designed to assess the state of complex technical and natural objects. An example of the implementation of a decision-making system for assessing the state of a multi-support power unit is presented, as a combination of basic solver modules