Design of a Digital Baseband Processor for UHF Tags

In this paper, we present a new digital baseband processor for UHF tags. It is a low-power and low-voltage digital circuit and adopts the Chinese military standard protocol GJB7377.1. The processor receives data or commands from the RF front-end and carries out various functions, such as receiving and writing data to memory, reading and sending memory data to the RF front-end and killing tags. The processor consists of thirteen main sub-modules: TPP decoding, clock management, random number generator, power management, memory controller, cyclic redundancy check, FM0 encoding, input data processing, output data processing, command detection module, initialization module, state machine module and controller. We use ModelSim for the TPP decoding simulation and communication simulation between tag and reader, and the simulation results meet the design requirements. The processor can be applied to UHF tags and has been taped out using a TSMC 0.18 um CMOS process.

PORTABLE MACHINE MODULE FOR PROCESSING WORN WEDGE GROOVES OF ROLLING-STOCK BOGIE FRAME WITH LASER BASING

The paper reports the investigations of digital technologies for processing worn wedge grooves of a deformed large-sized frame of a rolling-stock bogie by means of a portable machine module with basing on a laser beam on a bogie frame.

ANALYSING TEACHER’S DIFFICULTIES IN TEACHING LISTENING

This research is based on the importance of listening skill for students at Senior High School especially twelfth grade, because they will face the National Examination. As one of English skill, listening is the most difficult skill to be taught and this process cannot be avoided by all teachers who teach English. Moreover, some teachers still get difficulties how to teach listening to students and this research is focused on Analyzing Teacher’s Difficulties in teaching listening. In this research, the writer used case study and qualitative research method. The subject of this research was one of an English teacher at MA Islahul Aqidah Cikalongwetan West Java. The instruments of this research are observation, interview and questionnaire. In short, the results of this research showed that teacher’s difficulties divided into two factors, those are internal and external factors. Internal factors which came from the respondent himself such as; he feels the difficulties in teaching, preparing listening materials, choosing method, technique, and strategy. External factors are; sound from environment activities like woodcutter machine, module, media problem as cable injector of sound system to laptop, English laboratory, electric off, and the difference of listening materials in syllabus 2013 curriculum and National Examination materials.

Simulation of large-size plain bearings processing using a virtual prototype of machine module

An approach for modeling the mechanical processing of large-size plain bearings using a virtual prototype of a special machine module built in the MSC Adams software for kinematic and dynamic analysis is presented. Kinematic and dynamic characteristics of the module and the geometric model of the machined surface are shown.

On the application of the system of machines modular block type in the advanced technology logging activities

Рассматриваются возможности применения системы машин модульно-блочного типа в перспективных технологиях лесосечных работ, а также проблемы машинного парка лесозаготовительных предприятий России. Цель исследования - изучение структуры и особенностей эксплуатации системы лесных машин модульно блочного типа в современных условиях лесозаготовок с перспективой применения на ближайшее будущее. Для улучшения технологии проведения лесосечных работ и повышения экономической эффективности лесопромышленного комплекса предлагается провести ряд важных технических и технологических изменений. Одним из решений проблемы по улучшению эффективности работы является разработка и внедрение комплекса лесных машин, основанного на принципе эксплуатационной модульности. Это будет гарантировать технологическую гибкость производства, предоставит высокую производительность и обеспечит совместимость с окружающей средой. Приведен принцип устройства машин модульно-блочного типа с разделением функций между транспортными и технологическими модулями. Представлены графически классификация модулей по их назначению и концепция компоновки системы машин модульно-блочного типа, а также главный модуль (энергетический) и несколько технологических модулей, способных выполнять различные технологические операции в зависимости от условий и технологии производства. Как показал анализ рынка, наиболее перспективным направлением по улучшению механизации лесного парка машин является создание комплекса модульно-блочных машин на базе колесного трактора, оснащенных гидрообъемными передачами. Это делает конструкцию машины более гибкой и мобильной. Принцип формирования и работы модульной системы машин с многофункциональным технологическим оборудованием рассматривается в качестве перспективного направления по улучшению лесозаготовительного процесса. The article deals with the prospects for the use of machines modular block type in the advanced technology logging activities, as well as the machinery problems of logging enterprises in Russia. The research objective. The study of the structure and operating characteristics of a system of forest modular block type machines in current conditions with the prospect of their application in the nearest future. It is necessary that a number of important technical and technological changes should be made to improve the technology of logging operations and increase the economic efficiency of timber industry complex. One of the solutions to improve work efficiency is the development and introduction of forest machines based on the principle of operational modularity. It will ensure the flexibility of the production process, provide high work efficiency and, what counts, will be environmentally friendly. The article gives the description of the principle of the machine module block type, as well as the functions and how they are divided between the two modules. There are two pictures in the article. The first picture gives the classification of modules according to their application. The second picture shows the principle of arrangement of modular machine-block type. Both the main energetic module and some technological modules capable of performing processing steps depending on the conditions and production technology are presented. According to the market analysis that shows that the most promising direction to improve the mechanization of forest machinery is to create a complex modular block machines on the base of a wheeled tractor equipped with hydrostatic transmission. It will make the machine design more flexible and mobile. The principle of formation and operation of the modular system with multi-function machines process equipment is considered as a promising direction for improvement of the process of logging.