samples if possible first enters the processing ... Sterilization containers: from plastic bags to sterilized gallon paint bucket, can be used to have a sharp edge products such as crab, shrimp, and so on. Sampling tools: sampling tool including: a teaspoon, spoon, needle-nosed pliers, angle fovceps tongs beakers and beaker, tool type is generally decided by the sample products. All sampling and date of sterilization of the container should be checked and sterilization time should be indicated on the label and packaging of equipment facilities, some facilities can be purchased at a local laboratory sterilization or disinfection equipment, laboratory and sterilization of instruments and facilities can be kept on the ground for at least two months, expired facilities must be sterilized again. Sterile gloves: sterile gloves must not be enabled in a sample, if a product is in the process of sample collection must be contacted to do it's best to let the factory production line workers (workers processed products), in the sample into a collection container, since the workers in the production process to reach the product, so we cannot think of their products and have the additional pollution. When the gloves must be a way to avoid contamination, wear, gloves must be fit to work needs. No bacteria cotton swab child: General for swab take instrument facilities and factory environment regional, using cotton swab child General has a right of program, open cotton swab child stripping off epidermal, then must carefully of put in tube head Shang, note don't contaminated cotton swab childliquid to dissolve in liquid. Often referred to as solvent of liquid components in the solution ...AVolume of water solution. 6. the titre (t) titer is the solution concentration is another method. It has two meanings, said on its per milliliter of solution of solute in grams or milligrams. Titration of sodium hydroxide solution NaoH = 0.0028g/mL=2.8m g/mL for t, second per ml of solution corresponds to the measured substance grams or milligrams. If titre of reagent T=3.5 card, 1mL card reagent is equivalent to 3.5 grams of water content, and when the determination of silver nitrate and sodium chloride, says there are two concentrations of silver nitrate: AgNO3 t t NaCl =1.84mg/mL, =1mg/mL, 1mg, indicating a 1mL solution containing silver nitrate, which represents the 1mL solution 1.84mg of sodium chloride, NaCl t =1.84 said, Known titre multiplied by the number of volume consumed in the titration of the standard solution, can be worked out of components to be measured, quite easy to calculate. Worth noting is that there are a lot of books or reagent also follows the concept of normality in the directory indicated by n, such as hydrochloric acid concentration is 0.1N indicates 1L hydrochloric acid solution containing 0.1 equivalent, also called volume parts per million. Was one of the original international concentration, is based on the equivalent law. Now with the new concept of "amount of substance, such as rules" instead of the equivalent law, so equivalent concentrations are no longer applied. On the relationship between n and m, the equivalent relation between concentration and Molarity, is not the same for different substances. Such as sulfuric acid: 1M h 2 SO 4 =2N h 2 SO 4, General writing m (1/2H 2 SO4) =0.1000mol/L, and potassium permanganate: 1M KMhO4 =5N KMnO 4, General writing m (1/5KMnO4) =0.1000mol/L. Third, the solution has not been made and saved (a) preparation of standard solution method
crept their way onto cell phones, but the overwhelming function was still that of a
phone dialer itself. Cell phones had not yet become the multiuse, multifunction personal
tools they are today. No one yet saw the need for Internet browsing, MP3 playing, or
any of the multitudes of functions we are accustomed to using today. It is possible that
the cell phone manufacturers of 1997 did not fully perceive the need consumers would
have for an all-in-one device. However, even if the need was present, a lack of device
memory and storage capacity was an even bigger obstacle to overcome. More people
may have wanted their devices to be all-in-one tools, but manufacturers still had to
climb the memory hurdle.
To put the problem simply, it takes memory to store and run applications on any
device, cell phones included. Cell phones, as a device, until recently did not have the
amount of memory available to them that would facilitate the inclusion of “extra”
programs. Within the last two years, the price of memory has reached very low levels.
Device manufacturers now have the ability to include more memory at lower prices.
Many cell phones now have more standard memory than the average PC had in the
mid-1990s. So, now that we have the need, and the memory, we can all jump in and
develop cool applications for cell phones around the world, right? Not exactly.
Device manufacturers still closely guard the operating systems that run on their
devices. While a few have opened up to the point where they will allow some
Java-based applications to run within a small environment on the phone, many do not
allow this. Even the systems that do allow some Java apps to run do not allow the kind
of access to the “core” system that standard desktop developers are accustomed to
having.
1.3 Open Handset Alliance and Android
This barrier to application development began to crumble in November of 2007 when
Google, under the Open Handset Alliance, released Android. The Open Handset
Alliance is a group of hardware and software developers, including Google, NTT
DoCoMo, Sprint Nextel, and HTC, whose goal is to create a more open cell phone
