定西农业经济发展之管见

在近二十年来的改革与发展中，我国经济快速发展，东西部差距在逐渐拉大，缩小东西差距，要求整个西部经济增长。定西市作为一个以农业为主导产业的地区，促进农业经济的发展是增加农民收入的关键。从定西市农业经济发展现状来看，主要体现在以下几个方面。     

运行时设置字段问计算关系的方法

现代管理软件的编制过程中,程序的复杂性和灵活性是一对不可避免的矛盾.本文以一个工资软件的编制过程为例,介绍了如何利用ADO对象灵活设置工资项之间计算关系的一种方法.     

仁用杏抗寒性生理指标评价的研究

对抗寒性不同的3个仁用杏品种(抗寒性强弱排序为优一>白玉扁>龙王帽)枝条低温处理后,检测其萌芽率和抗寒性生理指标,并对这些生理指标与抗寒性的关系作了研究。结果表明,随温度的降低,萌芽率降低,电解质渗出率、可溶性糖和脯氨酸的含量、SOD和POD的酶活性呈上升趋势;仁用杏品种间抗寒性差异显著性分析显示,枝条的电解质渗出率、表皮的可溶性糖和游离脯氨酸的含量、木质部和表皮的POD酶活性可以作为仁用杏抗寒性能力评价指标,SOD酶活性不宜作为抗寒性评价指标;主成分分析表明,采用这些生理指标对仁用杏抗寒性进行综合评价的结果是可靠的。     

麝鼠的开发价值与几种饲养模式

一、麝鼠的开发价值 麝鼠又名青根貂、麝狸、麝香鼠,其毛绒密度占所有动物的第三位。其毛皮色泽美观,沥水性和不湿性仅次于水獭皮,在国际市场上素有“软黄金”之美誉。国际裘皮市场年贸易量为1000万,近年我国出口创汇在8万张左右徘徊,国际国内市场缺口很大。我国把麝鼠已列     

A Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties

We propose a simultaneous quantum secure direct communication scheme between one party and other three parties via four-particle GHZ states and swapping quantum entanglement. In the scheme, three spatially separated senders, Alice, Bob and Charlie, transmit their secret messages to a remote receiver Diana by performing a series of local operations on their respective particles according to the quadripartite stipulation. From Alice, Bob, Charlie and Diana＇s Bell measurement results, Diana can infer the secret messages. Ira perfect quantum channel is used, the secret messages are faithfully transmitted from Alice, Bob and Charlie to Diana via initially shared pairs of four-particle GHZ states without revealing any information to a potential eavesdropper. As there is no transmission of the qubits carrying the secret message in the public channel, it is completely secure for the direct secret communication. This scheme can be considered as a network of communication parties where each party wants to communicate secretly with a central party or server.     

Capacity of a Simultaneous Quantum Secure Direct Communication Scheme between the Central Party and Other M Parties

We analyse the capacity of a simultaneous quantum secure direct communication scheme between the central party and other M parties via M＋1-particle GHZ states and swapping quantum entanglement. It is shown that the encoding scheme should be secret if other M parties wants to transmit M ＋ 1 bit classical messages to the centre party secretly. However, when the encoding scheme is announced publicly, we prove that the capacity of the scheme in transmitting the secret messages is 2 bits, no matter how large M is.