It is urgent to construct an urban anti-terrorism oriented air ground integrated unmanned reconnaissance equipment system. Base on the background of application, this paper focuses main challenges faced by construction system, and puts forward relevant countermeasures suggestions.

High-cadence Earth observation smallsat images offer potential for near real-time global reconnaissance of all sunlit cloud-free locations. However, these data must be corrected to remove light-transmission effects from variable atmospheric aerosol that degrade image interpretability. Although existing methods may work, they require ancillary delays output, impacting their most valuable applica...

Understanding how the surfaces of airless planetary bodies—such as Moon—scatter visible light enables constraints to be placed on their surface properties and top boundary layer inputs set within thermal models. Remote sensing instruments—such Diviner onboard Lunar Reconnaissance Orbiter—measure emission scattering functions across (∼0.38–0.7 µm) infrared (TIR) wavelengths (∼0.7–350 μm). To pro...

NASA's EPOXI mission observed the disc-integrated Earth and Moon to test techniques for reconnoitering extrasolar terrestrial planets, using the Deep Impact flyby spacecraft to observe Earth at the beginning and end of Northern Hemisphere spring, 2008, from a range of ∼1/6 to 1/3 AU. These observations furnish high-precision and high-cadence empirical photometry and spectroscopy of Earth, suita...

The population and reactivity of two low-lying excited states in [Ru(bpy)2(dppn)] 2+ (bpy = 2,20-bipyridine, dppn = benzo[i]dipyrido[3,2-a:20,30-c]phenazine), a weakly emissive MLCT state and a long-lived ligand-centered pp* state, lead to efficient photoinduced DNA damage. Irradiation with visible light results in nearly complete DNA cleavage within 30 s (kirr Z 455 nm), likely from the combin...

A novel photocatalyst, PbBi2Nb2O9 has been discovered that shows high activities for degradation of organic pollutants, generation of photocurrent, and water decomposition into O2 or H2, all under visible right irradiation (lambda >/= 420 nm). This is the first example of an undoped, single-phase oxide photocatalyst that shows such reactivity. Its quantum yields are much higher than those for m...

We report the synthesis of a solution-processable, dodecyloxyphenyl-substituted azafullerene monoadduct (DPC59N) and its application as electron acceptor in bulk heterojunction organic solar cells (BHJ-OSCs). Due to its relatively strong absorption of visible light, DPC59N outperforms PC60BM in respect to short circuit current (JSC) and external quantum efficiency (EQE) in blends with donor P3HT.

CdSe nanoribbons show catalytic activity for photochemical hydrogen evolution from aqueous Na2S/Na2SO3 solution under irradiation with ultraviolet and visible light.

A reduced graphene oxide (RGO)-ZnIn(2)S(4) nanosheet composite was successfully synthesized via an in situ controlled growth process. The as-obtained RGO-ZnIn(2)S(4) composite showed excellent visible light H(2) production activity in the absence of noble metal cocatalysts.