منابع مشابه
Evaluating the Efficiency of Iranian Regional Railways
Railway transportation plays an important role in the economic development of Iran. National Iranian Railways includes fifteen regional railways which operate independently, but under the supervision of National Iranian Railways Company. Evaluating the efficiency of regional railways is an important issue in Iran and is one of the bases for budget and resource allocation for further developmen...
متن کاملOn Generalized Random Railways
We consider a random generalized railway defined as a random 3-regular multigraph where some vertices are regarded as switches not allowing traffic between any pair of attached edges. It is shown that the probability that the generalized railway is functioning is linear in the proportion of switches. Thus there is no threshold phenomenon for this property.
متن کاملSafety Functions in Railways
There are several ways to describe and structure safety rules for railways, and a few examples are given in the report. A tentative holistic framework for describing safety features in relation to safety rules is presented. The approach has been applied on rules needed to regulate the communication between different railway organisations and other parties.
متن کاملThe Alaskan Athabascan Grammar Database
This paper describes a repository of example sentences in three endangered Athabascan languages: Koyukon, Upper Tanana, Lower Tanana. The repository allows researchers or language teachers to browse the example sentence corpus to either investigate the languages or to prepare teaching materials. The originally heterogeneous text collection was imported into a SOLR store via the POIO bridge. Thi...
متن کاملMidwifery among the Alaskan Indians
squatting position as though she were in the act of defecation and using the hole as a privy vault. She grasps the stake with both hands. One squaw sits behind with arms elapsed around the patient's abdomen, and another sits at each knee to act as a brace or support. They make 110 examinations, the midwife not being allowed to see the vulva of the patient under any circumstances. When a pain co...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Scientific American
سال: 1920
ISSN: 0036-8733
DOI: 10.1038/scientificamerican01171920-62