The phrase "this paper has demonstrated" is correct and usable in written English.
You can use it when you are discussing a research paper or other type of paper that has presented evidence or facts to support a particular argument. For example, "This paper has demonstrated that lowering taxes can help stimulate economic growth."
As the first part of this paper has demonstrated, a warmer climate would reduce deaths.
An example shown in this paper has demonstrated this limitation of DNNs.
This paper has demonstrated that the integration of uniform design and quantum-behaved particle swarm optimization can effectively determine the optimal solutions for suspension parameters.
This paper has demonstrated that interpenetrating composites could be designed to not only have an significantly enhanced Young's modulus, but also have a Poisson's ratio at a desired value (e.g. positive, or negative, or zero).
The methodology presented in this paper has demonstrated its effectiveness in optimising scantling of ships at a very early design stage thanks to a management of critical problems usually studied at a later stage of the design.
The prequel to this paper has demonstrated that the netload baseline inflation – a feature particular to the industrial DSM unit commitment formulation – leads to higher and costlier day-ahead scheduling compared to the academic social welfare method.
The results presented in this paper have demonstrated that the HGHG FEL approach is quite adequate for the VUV coherent source, but not scalable to X-ray devices.
The examples in this paper have demonstrated the effectiveness and limitations of classical thermodynamics in solving specific problems (such as nucleation during solidification and solid-state precipitation in aluminum alloys).
The authors of this paper have demonstrated that initial guessing of parameter can have significant effect on overall model estimation performance.
The results shown in this paper have demonstrated the possible gains of IA receivers and indicate that these types of receivers are good candidates for the practical implementation in MU-MIMO LTE systems.
Our examples in this paper have demonstrated that by bringing together the approaches in general plant growth analysis and in forest growth and yield science it is possible to advance the concept of relative growth.
