We introduce in this paper cryptographic protocols which use combinatorial group theory. Based on a combinatorial distribution of shares we present secret sharing schemes and cryptosystems using Nielsen transformation...We introduce in this paper cryptographic protocols which use combinatorial group theory. Based on a combinatorial distribution of shares we present secret sharing schemes and cryptosystems using Nielsen transformations. Nielsen transformations are a linear technique to study free groups and general infinite groups. In addition the group of all automorphisms of a free group F, denoted by AUT (F), is generated by a regular Nielsen transformation between two basis of F, and each regular Nielsen transformation between two basis of F defines an automorphism of F.展开更多
Soybean is one of the world's most important oil and protein crops. Efficient transformation is a key factor for the improvement of soybean by genetic modification. We describe an optimized protocol for the Agroba...Soybean is one of the world's most important oil and protein crops. Efficient transformation is a key factor for the improvement of soybean by genetic modification. We describe an optimized protocol for the Agrobacterium rhizogenes-mediated transformation of soybean and the induction of hairy root development in vitro. Cotyledons with 0.5-cm hypocotyls were cut from 5-day-old seedlings and used as explants. After infection and co-cultivation,hairy roots were produced in induction culture medium after 10–12 days. Using this method, 90%–99% of the infected explants of five different cultivars produced hairy roots within one month. Observations using reporter constructs showed that 30%–60% of the hairy roots induced were transformed. Based on high transformation efficiency and short transformation period, this method represents an efficient and rapid platform for study of soybean gene function.展开更多
基于通用无线分组业务GPRS(General Packet Radio Service)的配电变压器抄表及监测终端(简称终端)采用32位ARM7芯片,硬件分为系统和接口2部分。系统部分主要包括CPU、存储器、实时时钟RTC(Real-Time Clock)芯片、复位及外围等电路;接口...基于通用无线分组业务GPRS(General Packet Radio Service)的配电变压器抄表及监测终端(简称终端)采用32位ARM7芯片,硬件分为系统和接口2部分。系统部分主要包括CPU、存储器、实时时钟RTC(Real-Time Clock)芯片、复位及外围等电路;接口部分包括RS-232/485通信、GPRS模块、红外通信、状态量监测、单总线温度传感器通信等。终端软件基于μC/OS-Ⅱ嵌入式操作系统设计,终端程序采用多任务、多缓冲区结构。论述了CPU/外围接口电路、操作系统移植、多功能电能表抄表、温度监测、GPRS通信、系统数据传输规约等。所设计的终端在现场运行稳定可靠。展开更多
文摘We introduce in this paper cryptographic protocols which use combinatorial group theory. Based on a combinatorial distribution of shares we present secret sharing schemes and cryptosystems using Nielsen transformations. Nielsen transformations are a linear technique to study free groups and general infinite groups. In addition the group of all automorphisms of a free group F, denoted by AUT (F), is generated by a regular Nielsen transformation between two basis of F, and each regular Nielsen transformation between two basis of F defines an automorphism of F.
基金supported by the Major Science and Technology Projects of China (2016ZX08010-004)the Ministry of Science and Technology of China (2016YFD0100504)the CAAS (Chinese Academy of Agriculture Sciences) Innovation Project
文摘Soybean is one of the world's most important oil and protein crops. Efficient transformation is a key factor for the improvement of soybean by genetic modification. We describe an optimized protocol for the Agrobacterium rhizogenes-mediated transformation of soybean and the induction of hairy root development in vitro. Cotyledons with 0.5-cm hypocotyls were cut from 5-day-old seedlings and used as explants. After infection and co-cultivation,hairy roots were produced in induction culture medium after 10–12 days. Using this method, 90%–99% of the infected explants of five different cultivars produced hairy roots within one month. Observations using reporter constructs showed that 30%–60% of the hairy roots induced were transformed. Based on high transformation efficiency and short transformation period, this method represents an efficient and rapid platform for study of soybean gene function.
文摘基于通用无线分组业务GPRS(General Packet Radio Service)的配电变压器抄表及监测终端(简称终端)采用32位ARM7芯片,硬件分为系统和接口2部分。系统部分主要包括CPU、存储器、实时时钟RTC(Real-Time Clock)芯片、复位及外围等电路;接口部分包括RS-232/485通信、GPRS模块、红外通信、状态量监测、单总线温度传感器通信等。终端软件基于μC/OS-Ⅱ嵌入式操作系统设计,终端程序采用多任务、多缓冲区结构。论述了CPU/外围接口电路、操作系统移植、多功能电能表抄表、温度监测、GPRS通信、系统数据传输规约等。所设计的终端在现场运行稳定可靠。
