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1.
对水热合成CdTe量子点的方法加以改进,并合成了用3-巯基丙酸(MPA)修饰的CdTe量子点(MPA-CdTe QD′s)。该量子点具有荧光特性,激发、发射波长分别为320,558nm。试验了17种常见金属离子对此量子点荧光强度的影响,结果发现只有Cd(Ⅱ)离子对其荧光有增强作用;Hg(Ⅱ)、Cu(Ⅱ)、Ag(Ⅰ)则对其荧光有猝灭作用,加入适量抗坏血酸和碘化钾可消除这3种金属离子的荧光猝灭作用。试验在pH 6的缓冲介质中,以20μL MPA-CdTe QD′s作为荧光探针,加入不同浓度的Cd(Ⅱ)离子并在反应6min后,体系的荧光增强程度与Cd(Ⅱ)离子浓度在5.0×10-7~3.9×10-5 mol·L-1范围内呈线性关系,检出限(3s/k)为4.8×10-7 mol·L-1。 相似文献
2.
利用实验室一般仪器,对洋葱中挥发性化学成分如含硫化合物、醇类、醛类、羧酸进行了定性检测,旨在让高师生体验探究学习,掌握探究方法,发展实验设计和探究能力。 相似文献
3.
采用荧光光谱法研究了水溶液中四溴荧光素、四氯四溴荧光素、二碘荧光素、乙基罗丹明B、健那绿B等5种荧光染料探针与牛血清白蛋白(BSA)的相互作用.实验表明,这5种染料探针同牛血清白蛋白结合时,疏水作用力起决定性作用,静电力起次要作用,相比之下牛血清白蛋白(BSA)结合阴离子的能力最强,其次为中性分子,最后为阳离子.通过疏水作用力,5种染料均是以非极性苯基进入BSA疏水性腔体中同色氨酸残基发生作用,弱氢键的形成加强了这种作用力,且使得光谱间能量转移效率明显提高.5种染料探针的极性部位由于极性和空间效应的原因难以进入腔体内部,致使反应均按接近1∶1的方式进行. 相似文献
4.
The generation of atomic entanglement is discussed in a system that atoms are trapped in separate cavities which are connected via optical fibres. Two distant atoms can be projected to Bell-state by synchronized turning off of the local laser fields and then performing a single quantum measurement by a distant controller. The distinct advantage of this scheme is that it works in a regime where Δ≈κ〉〉g, which makes the scheme insensitive to cavity strong leakage. Moreover, the fidelity is not affected by atomic spontaneous emission. 相似文献
5.
通过探究菠菜、葱与豆腐是否可以一起吃,使学生深刻理解化学与生活的密切联系。分别检验菠菜、葱中的钙、铁、镁和草酸;检验豆腐中的钙、铁、镁;菠菜与葱中草酸能否与豆腐中的钙生成不溶性草酸钙。 相似文献
6.
为了让高师生体验探究学习,掌握探究方法、发展实验设计和探究能力,以适应新课程对教师的需要,利用常用仪器、微型实验,用盐酸处理试样后,检测到松花蛋的蛋白和蛋黄中都含有维生素、钙、锌、镁、铁、磷,蛋白中还含有铅。 相似文献
7.
Teleportation of an unknown bipartite state via non-maximally entangled two-particle state 总被引:1,自引:0,他引:1 下载免费PDF全文
In this paper a new scheme for teleporting an unknown entangled state of two
particles is proposed. To weaken the requirement for the quantum
channel, without loss of generality, two communicators only share a
non-maximally entangled two-particle state. Teleportation can be
probabilistically realized if sender performs Bell-state
measurements and Hadamard transformation and receiver introduces two
auxiliary particles, operates C-not operation, single-qubit
measurements and appropriate unitary transformations. The
probability of successful teleportation is determined by the smaller
one among the coefficients' absolute values of the quantum
channel. 相似文献
8.
9.
水热条件下以CdCl2和4-(1-咪唑基)苯甲酸(Himbz)为反应物合成出一个新的具有一维梯子型链状结构的配位聚合物[Cd(imbz)(Cl)(H2O)]n(1),并分别用元素分析,红外谱图,差热分析和X-射线单晶衍射表征该结构。晶体结构分析结果表明:4-(1-咪唑基)苯甲酸离子(imbz)将Cd(Ⅱ)离子连接成一维Z字链,进而通过桥联氯原子被连接成一维梯状链结构,荧光谱图表明常温固态下配合物1发射蓝色荧光,荧光寿命为2.21 ns。 相似文献
10.
We propose a scheme to implement quantum state transfer between two distant quantum nodes via a hybrid solid–optomechanical interface. The quantum state is encoded on the native superconducting qubit, and transferred to the microwave photon, then the optical photon successively, which afterwards is transmitted to the remote node by cavity leaking,and finally the quantum state is transferred to the remote superconducting qubit. The high efficiency of the state transfer is achieved by controllable Gaussian pulses sequence and numerically demonstrated with theoretically feasible parameters.Our scheme has the potential to implement unified quantum computing–communication–computing, and high fidelity of the microwave–optics–microwave transfer process of the quantum state. 相似文献