Nested multilayer mirrors are commonly used in X ray telescope structure to increase the collecting area. To balance the difficulty and cost of producing these mirrors, Wolter-I structures are replaced with conical Wolter-I structures, but these can
Recently, the nested Mach–Zehnder interferometer [Phys. Rev. Lett. 111, 240402 (2013)] was modified by adding Dove prisms in a paper [Quantum Stud.: Math. Found. 2, 255 (2015)], and an interesting result is that, after the Dove prisms were inserted,
Mongoid ::包含
Mongoid::Includes改善Mongoid::Includes渴望加载，支持多态关联和嵌套的渴望加载。
用法
Album . includes ( :songs ) . includes ( :musicians , from : :band )
Band . includes ( :albums , with : -> ( albums ) { albums . gt ( release : 1970 ) } )
# The library supp
RIBs is the cross-platform architecture framework behind many mobile apps at Uber. The name RIBs is short for Router, Interactor and Builder, which are core components of this architecture. This framework is designed for mobile apps with a large numb
We experimentally demonstrate the generation of highly coherent Type-II micro-combs based on a micro-resonator nested in a fiber cavity loop, known as the filter-driven four wave mixing (FD-FWM) laser scheme. In this system, the frequency spacing of
MySQL批量插入问题
在开发项目时，因为有一些旧系统的基础数据需要提前导入，所以我在导入时做了批量导入操作 ,但是因为MySQL中的一次可接受的SQL语句大小受限制所以我每次批量虽然只有500条，但依然无法插入，这个时候代码报错如下：
nested exception is com.mysql.jdbc.PacketTooBigException: Packet for query is too large (5677854 > 1048576).
You can change th
dbcp 连接池不合理的锁导致连接耗尽解决方案
应用报错,表象来看是连接池爆满了。
org.springframework.transaction.CannotCreateTransactionException: Could not open JDBC Connection for transaction; nested exception is org.apache.commons.dbcp.SQLNestedException: Cannot get a connection, poo
