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为促进防护林生态体系建设,加强防护林保护管理,科学的进行抚育,更新采伐,对今后林业发展和提高生态效益,具有十分重要的意义。 相似文献
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We propose a scheme for optical realization of deterministic entanglement concentration of polarized photons. To overcome the difficulty due to the lack of sufficiently strong interactions between photons, teleportation is employed to transfer the polarization states of two photons onto the path and polarization states of a third photon, which is made possible by the recent experimental realization of the deterministic and complete Bell state measurement. Then the required positive operator-valued measurement and further operations can be implemented deterministically by using a linear optical setup. All these are within the reach of current technology. 相似文献
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Quantum circuits for realizing deterministic and exact teleportation via two partially entangled pairs of particles
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Deterministic and exact teleportation can be achieved via two partially
entangled pairs of particles [Gu Y J 2006 {\em Opt. Comm.} {\bf 259} 385]. The key point of the protocol is a generalized measurement described by a positive operator-valued measure, which can be realized by performing a unitary operation in the extended space and a conventional Von Neumann orthogonal measurement. By decomposing the evolution process from the initial state to the final state, we construct the quantum circuits for realizing the unitary operation with quantum Toffoli gates, and thus provide a physical means to realize the teleportation. Our method for constructing quantum circuits differs from the usual methods based on decomposition of unitary matrices, and is convenient for a large class of quantum processes involving generalized measurements. 相似文献
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对室内声学环境的重要性和噪声成因的深入分析,结合实践经验把吸声降噪设计的方法和程序进行归纳、总结,为此类型的室内设计工作提供思路和方法. 相似文献
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建立了超高效反相液相色谱-高分辨质谱方法以实现米格列奈及其3种异构体杂质的分离,以ACQUITY UPLC HSS T3(100 mm×2.1 mm,1.8 μ m)为色谱柱,以水-乙腈-正戊醇(75:25:1)(用甲酸调节pH至1.8)为流动相,流速为0.4 mL/min。根据Q Exactive四极杆/静电场轨道阱高分辨质谱的精确质量数及碎裂情况,发现了米格列奈及3种异构体存在碎片离子丰度的明显差异,确认其中两种为本次新发现的异构体杂质,并推断了米格列奈及3种异构体杂质可能的质谱裂解机理。经验证,该方法的灵敏度、重复性及线性均满足分析要求。在此基础上,对米格列奈异构体杂质的来源进行了探讨,发现异构体杂质1可在高温下降解产生,并对各企业的米格列奈钙原料样品进行了测定。 相似文献
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利用微波消解技术消化样品,在盐酸介质中,硒(IV)可氧化I-生成I3-,进而与结晶紫形成离子缔合物。硒-碘化钾-结晶紫-聚乙烯醇缔合物在565 nm时符合朗伯-比尔定律。分别测定了中国西昌红牛夕、依木锁石、毒清药三种主要彝药中的硒含量。试验证明:三种彝药中均含有丰富的微量元素硒, 红牛夕、依木锁石、毒清药三种彝药中硒含量分别为77.9、22.1、392.3 μg/g,加标回收率为97.8%~103.3%,方法的相对标准偏差RSD不大于0.42 %。用微波消解技术消化样品,消解时间短、操作简单、节省试剂、减少环境污染。试验结果真实可靠,适用于一般科学研究。 相似文献