aFig.6 clearly shows that k = 100 is a turning point for the group size distribution. When k < 100, the group size distribution curve looks almost perfectly linear in the log-log scale, which in turn implies that the distribution follows a power-law as the model predicts. When k > ...
So protons and electrons are a bit like the two different ends of a battery: they have equal and opposite electric charges. Since an atom contains equal number of protons and electrons, it has no overall charge: the positive charges on all the protons are exactly balanced by the negative ...
Explain why the conductivity of 0.077 M Na2SO4(aq) is greater than that of 0.077 M KF(aq). a. Ion size can play a big part in electrical conductivity. Some or all of the ions in KF are much smaller than the ions in Na2SO4. Thus, the ions in Na2SO4 are bet E...
In theory, you could power a tumble dryer with a 1.5-volt battery, but its tiny voltage would produce energy much too slowly to evaporate the water from your clothes and such a puny power pack simply doesn't contain enough energy to do the whole job. A 110-volt (or 220-volt) dryer ...
个人认为,项目上线,标志着一个项目真正的开始。从运维,到反馈,到再分析,再版本迭代,再优化… 这是一个漫长且考验耐心的过程。在这个过程中,作为数据存储的关键–>数据库的优化起到尤为重要的作用。 语文学的不好,废话也不多说,下面结合实例咱们说说MYSQL需要从哪些方面进行优化。
从where从句中,group by从句中,order by从句中,on从句中,select列中,还可以建立覆盖索引(也就是指索引包含所有查询的列,直接查索引就可以完成任务的), 索引字段越小越好,因为mysql存储是已页为单位的,如果从单页中获取更多的结果,减少IO操作,那么就起到了积极的作用。 离散程度越高的列放在联合索引的前面,因为...
Live fish were captured by seine netting and transported by road in closed containers fitted with battery-running air pumps to a mobile fieldwork station. Here, 267 fish were euthanised, one at a time, via an overdose of anaesthetic sedative (AQUI-S®: 175 mg/L, 20 min). Of these, ...
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adding also the Biermann battery effect23,37,38. We include non-ideal effects such as explicit Spitzer resistivity, implicit thermal conduction and heat exchange, as well as multi-group radiation diffusion with multi-material tabulated opacities and equations of state. The laser energy deposition is...
The measure of ‘exploration’ used during the selection process was a combination of two novel object tests where the latency to touch a novel object was recorded (e.g. a pink panther toy or an AA battery taped to a wooden stick), and one novel environment test where birds were released...