试题来源: 解析 C 正确答案:C解析:The non-prime numbers between 40 and 50 are 42, 44, 45, 46, 48, and 49. (Remember, the non-inclusive means we don’t include the 40 and 50.) Add them all up and we get 274.反馈 收藏
Mathematics - General MathematicsWe present a new sieve that allows us to find the prime numbers by using only regular patterns and, more importantly, avoiding any duplication of elements between them.doi:10.48550/arXiv.1101.3919Fabio GiraldoFranco...
Density of non-residues in short intervals We show that for any fixed $\\eps>0$, there are numbers $\\delta>0$ and $p_0\\ge 2$ with the following property: for every prime $p\\ge p_0$ and every integer $N$ such that $p^{1/(4\\sqrt{e})+\\eps}\\le N\\le p$, the...
The Hofstadter model, well known for its fractal butterfly spectrum, describes two-dimensional electrons under a perpendicular magnetic field, which gives rise to the integer quantum Hall effect. Inspired by the real-space building blocks of non-Abelian
Given \({\mathrm{{PSM}}}(P,S)\) where P is a peptide with length n and S is a spectrum, MS-DPR estimates the probability that a random peptide, say \(P^{\prime}\), with length \(n\), has \({\mathrm{{SPCScore}}}(P^{\prime},S)\ge {\mathrm{{SPCScore}}}(P,S)\)....
Closed quantum systems far from thermal equilibrium can show universal dynamics near attractor solutions, known as non-thermal fixed points, generically in the form of scaling behaviour in space and time. A systematic classification and comprehensive understanding of such scaling solutions are tasks of ...
Interestingly, PDAC tumor cells can also prime non-malignant tissue to facilitate metastatic dissemination. Researchers showed that circRNA-IARS expression correlates with malignancy of PDAC and that circRNA-IARS is abundant in PDAC sEVs [57]. Following transmission to human umbilical vein endothelial ce...
Primers used for 3′ and 5′ RACE were designed based on the known sequence information: 5′-TATATGCCAATCCCTTACATG-3′ (3′-prime specific); 5′- ACAGAAACATGTAAGGGATTGGC −3′ (5′-prime specific). RNA In Situ Hybridization Hybridization was performed using in vitro-transcribed ...
$$\hat {\cal{B}}^\prime = \hat U\hat {\cal{B}}\hat U^\dagger ,\quad \hat {\cal{E}}^\prime = \hat U\hat {\cal{E}}\hat U^\dagger .$$ (7) In addition, it is worth comparing the present idea of non-Abelian gauge field optics (NAGFO) with the transformation optics...
Total RNA was extracted from A549, NCI-H520, NHLF and DIPF cells using the RNeasy Mini Kit (#74106; Qiagen, Valencia, CA, USA), and complementary DNAs were synthesized from 1.0 μg of total RNA with the PrimeScrip TM RT mastermix (RR036A; Takara Bio, Shiga, Japan). RT-PCR was ...