他们还需解决电池的能量密度问题。
And they must solve problems with the energy density of batteries.
决定食物能量密度高低的因素主要有三个。
Three main factors play a role in what makes food high or low in energy density.
和脂肪一样，甜食也是典型的高能量密度食品。
葡萄的能量密度低，一杯葡萄含大约104卡路里。
Grapes have a low energy density - 1 cup of grapes has about 104 calories.
增加运行电压将能显著提高这种复合材料的能量密度。
Increasing the operating voltage will boost the energy density of the composite significantly.
葡萄干能量密度高，一杯葡萄干含大约434卡路里。
Raisins have a high energy density - 1 cup of raisins has about 434 calories.
谈到能量密度第一步即应了解哪些食品更适合我们选用。
The first step is knowing which foods are better options when it comes to energy density.
到那时纯镁可用作燃料(其能量密度大约是氢的十倍)。
The pure magnesium can then be used as a fuel (its energy density is about ten times that of hydrogen).
柴油比汽油能量密度更高，所以柴油发动机行程更长一些。
Diesel fuel has a higher energy density than gasoline, so a diesel engine gets better mileage.
导体的电容；电容器。电场的能量和能量密度。
Capacitance of conductor capacitor electric field energy and energy density.
简单讲，能量密度指特定食物量中的卡路里(能量)含量。
Simply put, energy density is the number of calories (energy) in a specific amount of food.
这一新材料的稳定性提供了提高能量密度的级别，张伯伦说。
The stability of the new materials suggests a way to increase energy density at the pack level, Chamberlain says.
与铀相比，钍的储藏量更为丰富，能量密度也更高。
Compared to uranium, thorium is far more abundant as well as much more energy-dense.
他解释说：“硅藻生物燃油比普通柴油具有更高的能量密度。”
'Algaes have more energy content than the equivalent diesel fuel,' he explained.
锂是元素周期表第三“轻”的元素，这使得锂具备更高的能量密度。
Lithium is the third-lightest element on the periodic table, which allows for far greater energy density.
改变生活习惯绝非易事。结合能量密度理念制定饮食计划同样如此。
Changing lifestyle habits is never easy, and creating an eating plan using the energy-density concept is no exception.
下面来看看Mayo诊所健康体重金字塔里各类食物的能量密度吧。
Here's a look at energy density by the categories in the Mayo Clinic Healthy Weight Pyramid.
在1990年代早期，这种电池每升的能量密度是大约10 0瓦时。
In the early 1990s, such batteries had an energy density of about 100 watt-hours per litre.
科学家们指出，快餐店不仅要降低食品的能量密度，而且要缩小食品的体积。
Fast food outlets should reduce the energy density of their menus as well as their portion sizes, the scientists said.
新型电池必须在轻小的电池组里储存大量电能，在能量密度上表现出高评分。
The batteries have to store a lot of energy in a small, light package, scoring high in a quality known as energy density.
作为一种燃料，乙醇的能量密度更低，所以需要消耗更多的量来完成同样的工作。
As a fuel, ethanol has a lower energy density and therefore needs more of it to do the same job.
但是对于任何大型的家伙，化石燃料的所拥有的能量密度看起来仍然是不可打败的。
But for anything much bigger, the energy density of aviation fuel still looks to be unbeatable.
但是乌鸦能源公司使用锂镍钴锰（NMC）合金制作，因为它能产生更大的能量密度。
Corvus, however, uses lithium nickel manganese cobalt (NMC) because it provides a greater energy density.
影响能量摄取的因素包括：份量大小、能量密度、用餐次数及每日消耗的小吃和饮料。
Factors that influence energy intake include portion size, energy density and the number of meals, snacks and drinks consumed each day.
公司称他们的低能量密度激光和一系列防护措施能保证暴露在其中的人体处于安全范围之内。
The firm says the low power-density of its lasers and a series of safeguards ensures that human exposure remains within regulatory limits.
在第一个季度中，能量密度——定义为每单位产出消耗的能源——事实上增加了，张先生说。
During the first quarter, energy intensity - measured as energy use per unit of output - actually increased, Mr. Zhang said.
（和电池相比，）这是一种“低能量密度”设备，电能被直接存储在两块静止的导电板上。
This is a low energy-density device, which stores electricity directly by charging two conductive plates with static.
我们面临的挑战是超越现在化学技术从而生产更安全、更便宜、更大能量密度的电池，这将是困难的。
The challenge is to move beyond the present chemistry to produce batteries that are safer, cheaper and have greater energy density. This will not be easy.
锂电池的正极一般是用磷酸锂铁制作，而乌鸦公司却使用能量密度更好地镍钴锰酸锂来制作锂电池正极。
The positive electrodes are often made from lithium iron phosphate. Corvus, however, USES lithium nickel manganese cobalt (NMC) because it provides a greater energy density.
储有石油的地方相对较少，因其能量密度、泵送能力及在内燃机上的易用性使其特别适宜成为运输燃料。
Oil is found in relatively few places, and its energy density, pumpability and ease of use in internal-combustion engines makes it particularly well suited as a transportation fuel.
应用推荐