نتایج جستجو برای: sigma primary
تعداد نتایج: 664382 فیلتر نتایج به سال:
Let $R$ be a $*$-prime ring with center $Z(R)$, $d$ a non-zero $(sigma,tau)$-derivation of $R$ with associated automorphisms $sigma$ and $tau$ of $R$, such that $sigma$, $tau$ and $d$ commute with $'*'$. Suppose that $U$ is an ideal of $R$ such that $U^*=U$, and $C_{sigma,tau}={cin R~|~csigma(x)=tau(x)c~mbox{for~all}~xin R}.$ In the present paper, it is shown that if charac...
A ring $R$ with an automorphism $sigma$ and a $sigma$-derivation $delta$ is called $delta$-quasi-Baer (resp., $sigma$-invariant quasi-Baer) if the right annihilator of every $delta$-ideal (resp., $sigma$-invariant ideal) of $R$ is generated by an idempotent, as a right ideal. In this paper, we study Baer and quasi-Baer properties of skew PBW extensions. More exactly, let $A=sigma(R)leftlangle x...
فرض کنید$r$ حلقه ای یکدار،$delta$ یک مشتق و $sigma$ یک خودریختی باشد. در این پایان نامه مفاهیم اساسی حلقه های اول، $ delta $-اول، $ sigma $-اول، مشتق متعامد و مشتق تعمیم یافته متعامد را معرفی می کنیم. شرایطی لازم و کافی روی $ r $ ارائه می دهیم به طوری که حلقه های چند جمله ای اریب $ r[x,x^{-1};sigma] $، $ r[x;sigma] $ و $ r[x;delta] $ اول یا نیمه اول باشند. همچنین، نتایجی مربوط ...
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A new continuous-time multi-stage noise-shaping delta-sigma modulator has been designed. This modulator provides high resolution and robust stability characteristics which are the primary advantages of the conventional multi-stage noise-shaping architecture. At the same time, previous critical challenges that degraded the overall performance of multi-stage noise-shaping delta-sigma modulators a...
let $r$ be a $*$-prime ring with center $z(r)$, $d$ a non-zero $(sigma,tau)$-derivation of $r$ with associated automorphisms $sigma$ and $tau$ of $r$, such that $sigma$, $tau$ and $d$ commute with $'*'$. suppose that $u$ is an ideal of $r$ such that $u^*=u$, and $c_{sigma,tau}={cin r~|~csigma(x)=tau(x)c~mbox{for~all}~xin r}.$ in the present paper, it is shown that...
در ریاضیات، عمل مشتق گیری، اشتقاق گفته می شود. مبحث اشتقاق ها ارتباط نزدیکی با موضوع نیم گروه های یک پارامتری دارد. مولد بی نهایت کوچک نیم گروه های یک پارامتری در شرایط خاص، همان اشتقاق است. اکنون تعمیم هایی از اشتقاق ها را به صورت جبری در نظر می گیریم. $-sigma$اشتقاق هاو $-(sigma, au)$اشتقاق هاتعمیم هایی از اشتقاق می باشند، که تعمیم هایی از نیم گروه های یک پارامتری، مرتبط با ای...
In this paper, some properties of pre-monotone operators are proved. It is shown that in a reflexive Banach space, a full domain multivalued $sigma$-monotone operator with sequentially norm$times$weak$^*$ closed graph is norm$times$weak$^*$ upper semicontinuous. The notion of $sigma$-convexity is introduced and the relations between the $sigma$-monotonicity and $sigma$-convexity is i...
Stroke leads to brain damage with subsequent slow and incomplete recovery of lost brain functions. Enriched housing of stroke-injured rats provides multi-modal sensorimotor stimulation, which improves recovery, although the specific mechanisms involved have not been identified. In rats housed in an enriched environment for two weeks after permanent middle cerebral artery occlusion, we found inc...
six sigma methodology is one of the most famous effective problem solving approaches that helps organizations to achieve their goals. despite the variety of its positive advantage, most companies have failed to implement six sigma successfully. the reason for this includes lack of the organizations attention to success or failure factors when implement six sigma projects. hence, while performin...
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