Here are articles on Scientific research on COVID.

Companies in the sector provide support to businesses, such as office administration, hiring and placing of personnel, security services, travel arrangement, cleaning, and waste disposal.

The US is a primary market for business services. Worldwide demand in the sector is driven by new businesss growth, job growth, increasing corporate...

Companies in the sector provide support to businesses, such as office administration, hiring and placing of personnel, security services, travel arrangement, cleaning, and waste disposal.

The US is a primary market for business services. Worldwide demand in the sector is driven by new businesss growth, job growth, increasing corporate involvement, and increasing disposable income. While large companies may operate globally or within a specific region, many business services firms serve small geographic areas near their headquarters.

More

The construction sector comprises establishments primarily engaged in the construction of buildings or engineering projects (e.g. highways and utility systems).

The construction industry is divided into three major segments: the construction of buildings segment includes contractors, usually general contractors, who build residential,...

The construction sector comprises establishments primarily engaged in the construction of buildings or engineering projects (e.g. highways and utility systems).

The construction industry is divided into three major segments: the construction of buildings segment includes contractors, usually general contractors, who build residential, industrial, commercial, and other buildings. Heavy and civil engineering construction contractors build sewers, roads, highways, bridges, tunnels, and other projects related to our nation’s infrastructure. Specialty trade contractors perform specialized activites related to all types of construction such as carpentry, painting, plumbing, and electrical work.

More

Engineering is concerned with the optimization of complex processessystems, or organizations by developing, improving and implementing integrated systems of people, money, knowledge, information, equipment, energy and materials.  In broad terms, engineering can be divided into four categories – chemical, civil, electrical and mechanical...

Engineering is concerned with the optimization of complex processessystems, or organizations by developing, improving and implementing integrated systems of people, money, knowledge, information, equipment, energy and materials.  In broad terms, engineering can be divided into four categories – chemical, civil, electrical and mechanical engineering.

The goal of engineering is to solve a problem or design a new product according to specifications to meet a predetermined set of needs or requirements. For example, electrical engineers may design an electronic consumer product that meets safety standards and perform according to goals. A civil engineer may be asked to design a new bridge, road or overpass that will remain structurally sound for many years.  They use specialized knowledge and skills in the mathematical, physical, and social sciences, together with the principles and methods of engineering analysis.

More

The government/public sector consists of governments and all publicly controlled or publicly funded agencies, enterprises, and other entities that deliver public programs, goods, or services.

Public sectors include public goods and governmental services such as the military, law enforcement, infrastructure (public roads, bridges, tunnels,...

The government/public sector consists of governments and all publicly controlled or publicly funded agencies, enterprises, and other entities that deliver public programs, goods, or services.

Public sectors include public goods and governmental services such as the military, law enforcement, infrastructure (public roads, bridges, tunnels, water supply, sewers, electrical grids, telecommunications, etc.), public transit, public education, along with health care and those working for the government itself.

More