Productivity of hauling by tajfun MOZ 500 GR cable yarder in Turkey

The extraction of timber is very important despite the process is difficult, expensive, time consuming, and has concerns with work safety. The extraction operations are used human, animal, and machine power. The purpose of this study is to investigate the productivity of the Tajfun MOZ 500 GR cable yarder during the extraction of timber from spruce stands in northeast Turkey. The research results imply that some working characteristics of the MOZ 500 GR cable yarder such as load volume, yarding distance, speed of the carriage, and time consumption per phase have an important impact on the productivity of the cable yarder. The results indicated that the productivity of MOZ 500 GR cable yarder was 8.39 m(3)/h for an average yarding distance of 90 m. Besides, the daily productivity of cable yarders was found at 67.12 m(3). The cable yarders seem ideal for use in the steep terrain. The use of cable yarders in wood production works is more ideal than other production techniques (human, animal, and tractor) in terms of productivity, speed, and work safety

High-speed algorithms & architectures for number-theoretic cryptosystems

Computer and network security systems rely on the privacy and authenticity of information, which requires implementation of cryptographic functions. Software implementations of these functions are often desired because of their flexibility and cost effectiveness. In this study, we concentrate on developing high-speed and area-efficient modular multiplication and exponentiation algorithms for number-theoretic cryptosystems. The RSA algorithm, the Diffie-Hellman key exchange scheme and Digital Signature Standard require the computation of modular exponentiation, which is broken into a series of modular multiplications. One of the most interesting advances in modular exponentiation has been the introduction of Montgomery multiplication. We are interested in two aspects of modular multiplication algorithms: development of fast and convenient methods on a given hardware platform, and hardware requirements to achieve high-performance algorithms. Arithmetic operations in the Galois field GF(2[superscript]k) have several applications in coding theory, computer algebra, and cryptography. We are especially interested in cryptographic applications where k is large, such as elliptic curve cryptosystems

Kapaciteti posmične sile spojeva namještaja H-tipa izrađenoga od različitih toplinski tretiranih vrsta drva

The aim of this study was to investigate the effect of wood species, heat treatment, adhesive type and joint technique on shear force capacity of H-type furniture joints. For this purpose, an experimental design that consisted of 3 wood species, 2 treatment processes (untreated, heat-treated), 2 adhesive types (polyurethane (PUR), polyvinyl acetate (PVAc)) and 2 joint techniques (dowel, mortise-tenon (MT)) and 5 replications for each group were prepared, and accordingly, a total of 120 specimens were tested under static shear loads. Siberian pine (Pinus sibirica), Iroko (Chlorophora excelsa), and common ash (Fraxinus excelsior), which are commonly used in furniture constructions, were used as wood species. In general, iroko showed the highest shear force capacity between the wood species. The specimens constructed of heat-treated wood species showed lower shear force capacity by approximately 15 % in comparison to the same untreated specimens. MT joints showed better performance than dowel joints higher by approximately 21 %. PVAc adhesive gave higher values than PU adhesive by around 5 %. According to the results of four-way interactions, highest shear force capacities of H-type joints were obtained from “Common ash-PVAc-MT” combination in groups of untreated specimens and from “Iroko-PU-MT” combination in groups of heat-treated specimens.Cilj ovog istraživanja bio je ispitati utjecaj vrste drva, njegove toplinske obrade, vrste ljepila i tehnike spajanja na kapacitet posmične sile spojeva namještaja H-tipa. Za tu je namjenu pripremljen eksperiment s ovim parametrima: tri vrste drva, dvije obrade (netretirani i toplinski tretiran namještaj), dvije vrste ljepila (poliuretan – PUR, polivinilacetat – PVAc) i dvije tehnike spajanja (moždanikom te čepom i rupom – MT). Za svaki sustav pripremljeno je pet uzoraka te je pri statičkom posmičnom opterećenju ispitano ukupno 120 uzoraka. Odabrane su vrste drva koje se često upotrebljavaju u konstrukcijama namještaja: sibirski bor (Pinus sibirica), iroko (Chlorophora excelsa) i jasen (Fraxinus excelsior). Prema rezultatima istraživanja, drvo iroka pokazalo je najveći kapacitet posmične sile od svih ostalih vrsta drva obuhvaćenih eksperimentom. Uzorci izrađeni od toplinski obrađenog drva imali su oko 15 % manje vrijednosti kapaciteta posmične sile od netretiranih uzoraka. MT spojevi pokazali su za oko 21 % veće vrijednosti od spojeva s moždanicima. Uz upotrebu PVAc ljepila vrijednosti su bile za oko 5 % veće od vrijednosti s PUR ljepilom. Prema rezultatima četverosmjernih interakcija, najveći kapaciteti posmične sile spojeva H-tipa dobiveni su za kombinaciju jasenovina – PVAc – MT u netretiranim uzorcima i za kombinaciju drvo iroka – PUR – MT u toplinski tretiranim uzorcima

FARKLI AĞAÇ TÜRÜNDE VE FARKLI BOYUTLARDAKİ KÖŞE DESTEK ELEMANLARININ SANDALYE MUKAVEMETİNE ETKİLERİ

Bu çalışmada, köşe destek elemanı ağaç türü ve boyutlarının sandalye mukavemetine etkileri araştırılmıştır. Sandalyeler, Doğu kayını (Fagus orientalis L.) ve Sarıçam’dan (Pinus sylvestris L.) üretilmiş olup, birleştirmelerde polivinilasetat tutkalı kullanılmıştır. Birleştirmeler, 60x60x25, 80x80x25 ve 100x100x25 mm ölçülerinde ve aynı 2 ağaç türünden, 6 farklı köşe destek elemanıyla desteklenmiş, ayrıca kontrol sandalyeleri hazırlanmıştır. Sandalyeler, ALA (American Library Association) standardındaki esaslara göre önden arkaya devirli yükleme deneyine alınmış ve değerler tasarım yükleriyle karşılaştırılmıştır. Sonuçta, köşe destek elemanlarının mukavemette etkili olduğu, birleştirmelerin köşe destek elemanlarıyla desteklenmesi gerektiği anlaşılmıştır. En yüksek değerler Doğu kayını ve 80x80x25 mm ölçülerindeki Doğu kayını köşe destek elemanlarıyla desteklenmiş sandalyelerde bulunmuştur

Simple and Low-Cost Synthesis of Al-doped ZnO/CuO Composite Nanowires for Highly Efficient Hydration Level Sensing

In this paper, we report on our investigation of the impact of Al doping on the primary physical properties of SILAR fabricated CuO/ZnO composite nanowires. Our characterization on surface and structural analysis showed that we were able to lightly dope the nanocomposites effectively using the SILAR method, which is cost-effective and repeatable. Conductivity of the Al-doped films changed significantly which resulted in greater sensing response for hydration. We utilized artificial sweat solutions to characterize the sensing response of the films and we demonstrated that sensing response almost doubled with Al doping. Transient response of sweat application also showed that response times were less than 10 s for 2% Al-doping. We conclude that Al doping on CuO/ZnO nanocomposites is an excellent candidate to be utilized for hydration sensing through sweat

OrienTel: Turkish Telephone Speech Database

Avrupa Birliği 5. Çerçeve Programı Projesi olan, Akdeniz çevresindeki Kuzey Afrika ve Orta Doğu ülkelerinde konuşulan dillerde telefon hattı üzerinden konuşma veritabanlarının oluşturulmasını amaçlayan Orientel Projesi (IST-2000-28373) kapsamında üretilen Türkçe veritabanı ve yapılan çalışmalar tanıtılmaktadır. Proje kapsamında toplam 21 dil için konuşma veritabanları toplanmaktadır. Çalışma yaklaşık 16 ayda başarıyla tamamlanmıştır; 1700 konuşmacının, cinsiyet, yaş, şive ve arama ortamı bakımından dengeli kayıtları yapılmış, çözümlenmiş ve dokümanlaştırılmıştır. Veritabanı, rakamlar, numaralar, zaman, tarih, sözcükler, cümleler içermektedir. Türkçe için bu ölçüde kapsamlı, toplanması ve kontrolü bakımından ayrıntılı bir sistematik izlenerek hazırlanmış ilk veritabanıdır.This paper describes Turkish telephone speech database created within the framework of Orientel (IST-2000-28373): a 5th framework project. Orientel aims to collect telephone speech data from 21 languages. Turkish database has been successfully wmpletcd in 16 months. The work includes recordings, annotations and documentation of 1700 recording sessions. The speaker distribution has been balanced with respect to criteria such as age, sex, dialect, calling environment and network. The database contains digits, numbers, time, date, words and sentences. It is the first Turkish speech database of its size and also of its detailed systematic manner followed in the preparation and validation