Results 131 to 140 of about 713,195 (361)

Fast-spectrum space-power-reactor concepts using boron control devices [PDF]

open access: yes
Several fast-spectrum space power reactor concepts that use boron carbide control devices were examined to determine the neutronic feasibility of the designs. The designs considered were (1) a 199-fuel-pin, 12-poison-reflector-control-drum reactor; (2) a
Mayo, W.
core   +1 more source

Most \u3cem\u3eCaenorhabditis elegans\u3c/em\u3e MicroRNAs are Individually Not Essential for Development or Viability [PDF]

open access: yes, 2007
MicroRNAs (miRNAs), a large class of short noncoding RNAs found in many plants and animals, often act to post-transcriptionally inhibit gene expression. We report the generation of deletion mutations in 87 miRNA genes in Caenorhabditis elegans, expanding
Abbott, Allison L.   +8 more
core   +1 more source

Regulation of Excitonic Behavior in Defective Acetylenic Polymers Enables Mechanism Switching in O2 Activation for Enhanced Water Decontamination

open access: yesAdvanced Science, EarlyView.
A molecular defect‐mediated charge accumulation strategy is developed to regulate the exciton behavior for selective molecular oxygen (O2)activation in poly(1,3,5‐triethynylbenzene) (PTEB). Artificial internal electric field (IEF) constructed in defective PTEB provides internal driving force to steer the directed migration of charge carriers, thereby ...
Xiaofeng Tang   +8 more
wiley   +1 more source

In Situ Utilization of Co‐Existing Metal Ions to Fabricate Single‐Atom Catalyst for Boosting Fenton‐Like Activity

open access: yesAdvanced Science, EarlyView.
A metal‐free TQBQ‐COF with pre‐designed anchoring sites captures coexisting Cu²⁺ from wastewater to form a single‐atom catalyst within 1 min. This in‐situ fabrication boosts visible‐light photo‐Fenton activity, enabling efficient removal of organics pollutants via 1O2 and holes.
Jiaxing Yu   +7 more
wiley   +1 more source

Threshold of kurtosis on occupational hearing loss associated with non-steady noise

open access: yes环境与职业医学
BackgroundKurtosis reflecting noise's temporal structure is an effective metric for evaluating noise-induced hearing loss (NIHL), and its threshold is still unclear.
Yang LI   +9 more
doaj   +1 more source

Tungsten nuclear rocket, phase I, part 1 Final report [PDF]

open access: yes
Tungsten water moderated nuclear rocket reactor experiments and ...
Bardes, R. G.   +9 more
core   +1 more source

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