In a previous paper we derived an expression for the di erentials in the Lyndon-Hochschild-Serre spectral sequence of a split extension G = HoQ of nite groups with coe cients in a eld. Here we apply that result to the case where H and Q are elementary abelian 2-groups and char k = 2. We then work out a special case, in which H has rank 4 and Q has rank 2, from a class of examples constructed by...

Abstract To ensure the safety of elderly and to provide a convenient comfortable travel experience, walkers are widely used. The Quality Function Deployment (QFD)/Teoriya Resheniya Izobretatelskikh Zadatch (TRIZ) integrated model is constructed specific implementation process given by starting from mechanical structure product. Firstly, design requirements existing product obtained users interv...

Properly solving the relationship between conservation and devel-opment is one of important requirements in development historic urban. The author approaches issue through case studies old Quarter, a special historical sites Hanoi capi-tal. process urbanization urban has af-fected made Old Quarter (HOQ) many changes. How to maintain HOQ been studied by scientists. Some results those have applie...

Customer service is increasingly being recognized as a source of competitive advantage. Determining customer needs accurately, meeting and exceeding them in a consistent manner is the key to the effective customer service. Companies should adapt a strategic, proactive focus on customer service based on understanding logistics process and designing logistics system to meet their needs. This ...

Customer service is increasingly being recognized as a source of competitive advantage. Determining customer needs accurately, meeting and exceeding them in a consistent manner is the key to the effective customer service. Companies should adapt a strategic, proactive focus on customer service based on understanding logistics process and designing logistics system to meet their needs. This ...

We report in this letter the outstanding frequency stability performances of an autonomous cryogenique sapphire oscillator presenting a flicker noise floor below 2e-16 near 1,000 s integration time and long term Allan Deviation (ADEV) limited by random walk process 1e-18/sqr(tau). The qualification at level called for implementation sophisticated instrumentation associated with ultra-stable ref...