The disjunctivities of ω-languages

An ω-language over a finite alphabet X is a set of infinite sequences of letters of X. Consider congruences IL and Pω, L on X* and a congruence OL on Xω introduced by an ω-language L. IL, Pω, L, and OL are called the infinitary syntactic-congruence, the principal congruence and the ω-syntactic congruence of L, respectively. If IL (Pω, L, OL) is the equality then L is called an I-disjunctive (P-disjunctive, O-disjunctive, respectively) ω- language. Properties concerning such ω-languages are explored and relations between these ω-languages are also studied

Biofibre production from chicken feather

The global poultry industry generates at least 2 million tonnes of chicken feather every year. Feather fibre has potential as reinforcement for polymer composites with light-weight, thermal insulation and acoustic dampening properties. This study aimed to develop a process to produce clean fibre recovered from chicken feather. Raw feather was decontaminated by 0.15% sodium hypochlorite in 25 L water at pH 10.0 for two 30 min stages and cleaned by 0.15% hydrogen peroxide in 25 L water for three 30 min stages. Cleaned feather was comminuted in 300 L water using a centrifugal pump at 30 Hz impeller speed on full recycle for 4 h. Rachis and partially cut feather were removed using a 5 mm filter and fibre was recovered using a 1 mm filter. Wet fibre was dried in an air-forced oven at 70°C. Morphological studies revealed fibre surface remained intact after the treatment process

[Review of] Wen-Shing Tseng and David Y. H. Wu, eds. Chinese Culture and Mental Health

Tseng and Wu have performed a creditable task in editing this book that involved twenty-nine delegates from the Conference on Chinese Culture and Mental Health (Hawaii, 1982). Their purpose was to have insiders produce a definitive work on the Chinese culture and its interaction with the mental component of health. The Chinese are described in the preface as having a history of at least 5000 years of civilization, with China comprising ... one quarter of the world\u27s people, but having people of the Chinese culture who live in various geographical areas, including ... Mainland China, Taiwan, Hong Kong, Singapore, Australia, Canada, and the United States

Open Access to Cable Data Networks

The networks that are generically referred to as ?cable? today began their lives with a particular purpose: the distribution of television signals within a community. Given this history, cable networks have always operated under a regulatory regime separate from telephone networks?. Telephone systems are regulated as common carriers: telephone network services must be made available to all potential customers in a non-discriminatory fashion. Cable networks, in contrast, are not subject to the requirements of common carriage: cable system operators are under no legal obligation to make their networks available to anyone who wants to use them to distribute content (for example, a new television channel), and have in fact historically exhibited a high degree of vertical integration between conduit (cable networks) and content (TV channels). As ever more cable systems gain the capability to connect their subscribers to the Internet, this reality has sparked an intense legal wrangling and debate over the issue that is referred to as ?open access.? 1 Should cable systems with the capability to transmit data be required to allow any service provider to access customers through the cable network? Or is the current industry structure?in which service providers can only gain direct access to a cable system if they succeed in negotiating an agreement with the cable operator?a more appropriate way forward

Improvement of thermally formed nickel silicide by ion irradiation

A significant improvement of the lateral uniformity of thermally formed Ni_(2)Si layers has been observed after low‐dose (10^(13)~3 × 10^(14) ion/cm^2) Xe irradiation of an As‐deposited Ni film. Measurements have also been made on samples that contained a thin impurity layer formed intentionally between the silicon substrate and the evaporated nickel film. The impurity layer was thick enough to prevent thermal silicide formation in unirradiated samples, but in irradiated samples, the silicide formation was not prevented. Similar results were obtained for As implantations. We attribute this effect to ion mixing of the interfacial layer. These results demonstrate that a low‐dose irradiation can render the process of silicide formation by thermal annealing more tolerant to interfacial impurities. The concept is of potential significance to VLSI technology

Emphysematous pyelonephritis with left renal vein thrombosis-case report successfully treated by conservative methods

Presently emphysematous pyelonephritis is a rare but life-threatening disease, mostly seen in patients with urinary tract obstr uc- tion and diabetes mellitus. It is characterized by the production of gas and necrosis in the renal parenchyma, collecting systems, and perinephritic tissue. Radiologically, the Huang and Tseng classification is used to categorize the severity of the disease. Our case was 49 years old female pre- senting with unconsciousness, fever and bilateral Grade 3 lower extremity eodema one week after left percutaneous nephrolithotomy procedure because of urinary tract stone. Abdominal computerized tomography scan showed renal parenchymal and perinephritic tissue necrosis with the production of gas and renal vein thrombosis which was in accordance with Huang and Tseng classification Grade 3A. We treated our patient with the appropriate antibiotic, enoxaparin sodium, strict glycemic control, and supportive treatment without any surgical intervention or nephrectomy