in this paper we propose and simulate a new heterostructure mesfet, called δ-doped ldd hmesfet. to improve carrier velocity in vicinity of the source in channel of gaas mesfet, one can replace source with alxga 1-x as. by increasing al content, discontinuity of hetero-interface could be increased. therefore, the velocity increases in the low field. however, increasing al mole fraction in excess...

The performance and reliability of NMOSFET asymmetric lightly doped drain (LDD) devices (with no LDD on the source side) are compared with those of conventional LDD devices. At a fixed Vdd; asymmetric LDD devices exhibit higher Idsat and shorter hot-carrier lifetime. To maintain the same hot-carrier lifetime, asymmetric LDD devices must operate at lower Vdd while higher Idsat is retained. For t...

The reliability and performance of NMOSFET asymmetric LDD devices (with no LDD on the source side) are compared with that of conventional LDD devices. The results show that asymmetric LDD devices exhibit higher Idsat and larger Isub . To maintain the same hot-carrier lifetime, asymmetric LDD devices must operate at lower Vdd . For the same hot-carrier lifetime, we show that ring oscillators wit...

BACKGROUND Lumbar intervertebral disc degeneration (LDD) frequently occurs in athletes. Associations between LDD and trunk muscles still remain unclear. PURPOSE This study examined whether there is an association between the prevalence of LDD and the symmetry and size of the cross-sectional areas (CSAs) of the trunk muscles in combat sports athletes. METHODS Participants in this study were ...

Background: Language Development Disorders (LDD) is a common idiopathic impairment in children. Numerous risk factors play a role in the emergence of this disorder.  Objectives: The present study aimed to examine risk factors of LDD in children aged two to five years. Materials & Methods: In this case-control study, 98 children (aged two to five years) with LDD and 98 children without LDD wer...

OBJECTIVES To examine association of candidate genetic variants in structural, inflammatory, matrix modifying, vitamin D receptor genes and variants associated with osteoarthritis, with surgical candidates and surgical patients with lumbar disc degeneration (LDD), in light of their previously reported susceptibility for LDD. METHODS Genotyping of 146 Norwegian LDD patients and 188 Norwegian c...

Long-distance dispersal (LDD) includes events in which propagules arrive, but do not necessarily establish, at a site far removed from their origin. Although important in a variety of ecological contexts, the system-specific nature of LDD makes ‘‘far removed’’ difficult to quantify, partly, but not exclusively, because of inherent uncertainty typically involved with the highly stochastic LDD pr...

CONTEXT Lumbar disk disease (LDD) is one of the most common musculoskeletal diseases, with a prevalence of about 5%. A tryptophan (Trp) allele (Trp2) was recently discovered in the COL9A2 gene that is associated with dominantly inherited LDD but is only present in about 4% of Finnish patients with LDD. OBJECTIVE To determine if other collagen IX gene sequence variations play a role in the pat...

Long-distance dispersal (LDD) of plants poses challenges to research because it involves rare events driven by complex and highly stochastic processes. The current surge of renewed interest in LDD, motivated by growing recognition of its critical importance for natural populations and communities and for humanity, promises an improved, quantitatively derived understanding of LDD. To gain deep i...