Nathan Sears had begun a strikingly ambitious intellectual project of reimagining international relations and world order, almost from the ground up. saw that we were in new era human history, an existential risk. We face threats global civilisation collapse, possibly even extinction, our own making. These anthropogenic risks include nuclear weapons, biological weapons—especially engineered pan...

این پژوهش با الهام گرفتن از نتایج یک طرح مطالعاتی کاربردی، رویکرد سلسله­‌مراتبی جهت پیگیری فرایند توسعه تأمین‌کنندگان و حمایت تصمیمات موجود در هر مراحل آن ارائه‌ می‌کند. ابتدا، زمینه‌های تأمین نیازمند سپس واجد شرایط هریک زمینه‌ها به کمک تصمیم‌گیری چندشاخصه بهترین-بدترین مشخص می‌گردند. معیارهای شناسایی نیز مرور مطالعات پیشین بهره‌گیری نظرات خبرگان حوزه‌ی خرید استخراج‌شده‌اند. درنهایت، مدل ریاضی ...

In a different approach, Hedlund [4], Sears [13], and Ryan [12] defined the shift dynamical system and investigated the properties of the continuous transformations which commute with the shift transformations, and showed many interesting results in one-dimensional tessellation spaces. Hedlund conjectured that in some sense, the set A of all parallel maps which are injective on the set C of all...

We introduce the Cauchy augmentation operator for basic hypergeometric series. Heine’s 2φ1 transformation formula and Sears’ 3φ2 transformation formula can be easily obtained by the symmetric property of some parameters in operator identities. The Cauchy operator involves two parameters, and it can be considered as a generalization of the operator T (bDq). Using this operator, we obtain extensi...

Sears, Roebuck and Company uses a vehicle-routing-and-scheduling system based on a geographic information system to run its delivery and home service fleets more efficiently. Although the problems to be solved can be modeled as vehicle-routing problems with time windows (VRPTW), the size of the problems and thus practical complexity make these problems of both theoretical and practical interest...