Titanium series: introduction, titanium series Introduction

Titanium series: introduction, titanium series Introduction

There are still very few materials about Titanium in China. I have recently read the official documents. By the way, I will translate them. Thank you for your attention.

Among the various features of Titanium cross-platform, creating a real native application is the most unique feature, which is compared with the web-based enhanced webview solution. Titanium does not want to be bound by webview. It deeply integrates the underlying platform. This gives Titanium developers the ability to use the native components and services of the system to develop applications with comparable native performance. These features are not available in other cross-platform solutions. You can also access the following features:

Titanium allows you to create simulated, full-featured applications, which cannot be implemented by browsers. We have done a lot of work on cross-platform compatibility, so you don't have to do it again. More than 80% of the functional code of an application can be reused. Titanium provides a deep and highly reusable development platform. The Titanium licensed by Appcelerator is under The Apache2 license, both personal and commercial purposes are free of charge.

In this section, we have learned some basic information about how to write cross-platform mobile applications using Titanium and introduced some features that you can access. Next, we will briefly introduce javascript, this allows you to become an efficient Titanium developer.

Original: http://docs.appcelerator.com/titanium/latest! /Guide/Welcome_To_Titanium!

Is TITANIUM the best series in Columbia?

The titanium series is the premium series of columbia's high-end products.
But it cannot be said that the best thing about columbia is that the highest-end equipment in the same system can be used to adapt to medium and high levels of outdoor adventure.

Introduction to titanium

A metal element, gray, with an atomic number 22, with a relative atomic mass of 47.87. It can burn in nitrogen and has a high melting point. Titanium blunt and titanium-based alloys are new structural materials mainly used in the aerospace and marine industries.
From the discovery of titanium to the production of pure products, it took more than one hundred years. Titanium was actually used and realized its true nature after 1940s.
The earth's ten-kilometer-thick strata contain up to 6‰ titanium, 61 times more than copper, and rank the tenth place in the earth's crust (ranking of elements in the earth's crust: oxygen, silicon, aluminum, iron, calcium, sodium, potassium, magnesium, hydrogen, titanium ). Grab a handful of dirt from the ground, which contains several thousandths of Titanium. The world's reserves of over 10 million tons of titanium are not uncommon.
There are hundreds of millions of tons of sand and gravel on the beach, titanium and zirconium, these two kinds of heavy than sand and gravel minerals, mixed in the sand and gravel, through the sea for millions of years of continuous cleaning, the heavy titaniron ore and Zircon Sand ore are washed together to form a complex and zirconium ore layer along the long coast. This kind of mineral layer is a black sand, usually several centimeters to dozens of centimeters thick.
Titanium is not magnetic, so a nuclear submarine built with titanium does not have to worry about magnetic mine attacks.
In 1947, titanium was smelting in factories. In that year, the output was only 2 tons. Production surged to 1955 tons in 20 thousand. In 1972, the annual output reached 0.2 million tons. The hardness of titanium is similar to that of iron and steel, and its weight is almost half of that of iron of the same size. Although titanium is slightly heavier than aluminum, its hardness is twice higher than that of aluminum. Now, in space rockets and missiles, a lot of titanium is used to replace steel. According to statistics, at present, the world's annual use of titanium for cosmic navigation has reached more than one thousand tons. Titanium Powder is also a good rocket fuel, so titanium is known as cosmic metal and space metal.
Titanium has good heat resistance, and its melting point is as high as 1725 ℃. At normal temperature, titanium can lie safely in a variety of strong acid and alkali solutions. Even the most ferocious acid, Wang Shui, cannot corrode it. Titanium is not afraid of sea water. Some people have sunk a piece of titanium to the bottom of the sea. After five years, they will take it up and see that it sticks to many small animals and submarine plants, but it does not rust at all, and it is still shining.
Now, people begin to use titanium to create a submarine, a titanium submarine. Because titanium is very strong and can withstand high pressure, this type of submarine can sail in the deep sea up to 4500 meters.

Titanium is located in family iv B in the periodic table of elements. The Atomic sequence number is 22. The nucleus consists of 22 proton and 20-32 neutron. The outer Electronic Structure of titanium is 1S2 2S2 2P6 3S2 3D2 4S2. The radius of the nucleus is 5x10-13 cm.

Physical

Titanium density is 4.506-4.516g/cm (20 ℃), melting point is 1668 + 4 ℃, melting latent heat is 3.7-5.0 kcal/G atoms, boiling point is 3260 + 20 ℃, latent Heat of evaporation: 102.5-112.5 kcal/G atoms, critical temperature: 4350 ℃, critical pressure: 1130 atmospheric pressure. The thermal conductivity and conductivity of titanium are poor, which is similar to or slightly lower than that of Stainless Steel. Titanium has super conductivity, And the superconducting critical temperature of titanium is 0.38-0.4 K. At 25 ℃, the heat capacity of titanium is 0.126 cards/grams of atoms · degree, the heat entropy is 1149 cards/grams of atoms, the entropy is 7.33 cards/grams of atoms · degree, and titanium metal is a magnetic material, magnetic conductivity is 1.00004.
Titanium is plasticity. The elongation of high pure titanium can reach 50-60%, and the section shrinkage can reach 70-80%. However, the strength is low, so it is not suitable for structural materials. The existence of impurities in titanium has a great impact on its mechanical properties. In particular, Gap impurities (oxygen, nitrogen, carbon) can greatly increase the strength of titanium and significantly reduce its plasticity. Titanium, as a structural material, has good mechanical properties. It is achieved by strictly controlling the appropriate impurity content and adding alloy elements.

Chemical Properties

Titanium reacts with many elements and compounds at high temperatures. Various elements can be divided into four types according to their different reactions with titanium:
Category 1: Halogen and oxygen elements and titanium generate a bond and an ionic bond compound;
Class 2: Transition Elements, hydrogen, Be, boron, carbon and nitrogen elements and titanium to generate intermetallic substances and finite solid solutions;
The third category: zirconium, haghu, vanadium, chromium, and SC elements and titanium to generate an infinite solid solution;
Category 4: inert gases, alkali metals, alkali-earth metals, rare earth elements (except SC), which do not react with titanium, such as antimony and thost... full text>