bibliometric, and scientometric approaches are used to provide appropriate tools for evaluating scientific products at local, national, and international levels. iran, the same as other countries, has many universities and research centers in the field of engineering that iran's most of the scientific products account for the field of engineering. this study is a descriptive approach using scie...

Polynomial vector fields which admit a prescribed Darboux integrating factor are quite well-understood when the geometry of the underlying curve is nondegenerate. In the general setting morphisms of the affine plane may remove degeneracies of the curve, and thus allow more structural insight. In the present paper we establish some properties of integrating factors subjected to morphisms, and we...

in the september 15, 2016 issue of science, dr. richard stone wrote a report regarding selling theses and research articles in iran. there are noteworthy points in this report which truly disturb the iranian scientific community, but the present report is not the whole truth about the iranian scientific community. iran’s scientific infrastructure was destroyed in the eight-year imposed war by s...

The band structure of the Lamé equation, viewed as a one-dimensional Schrödinger equation with a periodic potential, is studied. At integer values of the degree parameter l, the dispersion relation is reduced to the l = 1 dispersion relation, and a previously published l = 2 dispersion relation is shown to be partially incorrect. The Hermite–Krichever Ansatz, which expresses Lamé equation solut...

Army ants form nomadic insect colonies whose chief food is other social insects. Here we compare the rate of army ant raids with the average density of their potential prey from 28 New World subtropical and tropical localities. We estimate that army ant raids occur at the rate of 1.22 m per day in tropical forests. Army ant raid rates increased with primary productivity, and with the density of...

Ensuring food security is the main issue in solving socio-political problems. The severity and scale of poor-quality nutrition world's population are justified by socio-economic factors, which allows us to understand directions its solution. Uncontrolled production consumption can lead a catastrophe for humanity. In modern conditions high uncertainty on world markets general, particular, intens...

Sosyal bilgiler lisans ve lisansüstü öğrencilerin sosyo bilimsel konulara yönelik argümantasyon düzeylerinin belirlenmesi amacıyla yapılan araştırma, nitel araştırma yaklaşımlarından durum çalışması olarak desenlemiştir. 2020-2021 bahar döneminde Batı Karadeniz bölgesinde bir üniversitede sosyal eğitiminden 2. Sınıf, 4. Sınıf lisansütü sınıfından 4’er kişi olmak üzere toplam 12 ile yürütülmüştü...

Strong gravitational lensing and stellar dynamics provide two complementary and orthogonal constraints on the density profiles of galaxies. Based on spherically symmetric, scale-free, mass models, it is shown that the combination of both techniques is powerful in breaking the mass-sheet and mass-anisotropy degeneracies. Second, observational results are presented from the Lenses Structure & Dyn...