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Battery size is also a limiting factor constrained by the application requirements.
In this paper we will consider two different designs of piezoelectric energy harvesters, with different size and electromechanical properties.
The performance of a piezoelectric harvester can be optimized by maximizing the generalized electromechanical coupling coefficient Γ and the mechanical quality factor QM.
A typical way to increase QM is to reduce the mechanical damping: adopting vacuum processing mechanical quality factors larger than 1000 can be obtained.
A problem seriously affecting piezoelectric energy harvesters is the energy loss on their parasitic capacitance CP.

The degree of compaction is a measure of the main evaluation index of road machinery compaction quality, but also affects the working characteristics of vibratory roller.
Many factors affect the compaction quality, mainly related to properties of compacted materials, compaction machinery of technical parameters and operating parameters, compaction construction technology, and so on.
The properties of compression material include material types, gradation, moisture content etc..
The degree of compaction calculated as follows: (1) In the formula: for field compaction of soil dry density; maximum dry density of compaction experiments similar soil With compaction operations, the compaction density of the material is gradually increased and mechanical properties will be changed accordingly.
Vibratory frequency of vibration is the important parameter affecting the movement of soil particles, reflecting the impact number of vibratory wheel on the pressed material impact in the unit of time.

Using this technique can improve the surface properties of steel, prolong the service life of mold and reduce production cost [3-4].
Friction and wear properties were tested by the high-speed slippery piece wears away to experiment machine (MRH-3), Revolve speed 390 r/min，at loads 100N, times 100S.
The formation of amorphous materials provide high strength and toughness, and wear resistance and corrosion resistance are also significantly higher than that of ordinary steel, it also has excellent physical properties, chemical and mechanical properties[8].
This phenomenon is mainly due to several factors, first is the material structure after bombardment; In addition, crater morphology and region density; material cross- section hardness distribution and the experimental force size [9-10].
（a）COF （b）Amount of wear Fig.10 The tribological properties after treatment Corrosion resistance.

We evaluated the mechanical properties under high temperature and humidity.
We then evaluated the remoulded binder-free composite’s mechanical properties.
Hence, the fibreboard’s degraded mechanical properties can be predicted because the bonding strength between fibres is insufficient.
(3) Wax protected binder-free composite from high temperature and humidity, but its mechanical properties became lower to some extent
Yamamoto, Development of bamboo-based polymer composites and their mechanical properties, Composites Part A, 35 (2004) 377-383

The reliability and safety of their work depends on many factors: geometric dimensions, materials used, external loads and their combinations, etc. [3, 4].
Parameters of fire-retardant coatings of steel constructions under the influence of climatic factors.
Results of experimental research into correlations between hazardous factors of ignition of materials in premises.
Impact of halogen-free flame retardant with varied phosphorus chemical surrounding on the properties of diglycidyl ether of bisphenol-A type epoxy resin: synthesis, fire behaviour, flame-retardant mechanism and mechanical properties, RSC Advances, 6(64), 59226–59236
Mechanical properties modification of a thin film phenolic resin filled with nano silica particles, Computational Materials Science, 96, 411–415

The properties of breathable, moisture permeability, moisture retention and good biocompatibility are also needed.
However, considering that the compatibility between the drug and the polymer, it is an important factor affecting drug release, Zeng[13] found that when the quantity of drugs increased, the stability of the ejection liquid and impact for the fiber formation would change.
In addition to gained biocompatibility, mechanical properties can't be ignored.
These results showed that the mechanical properties of the nanofiber membranes could handing for the wound healing process.
Firstly, solve materials preparation (parameters, homogeneous and stable core-shell structure).Secondly, the properties such as permeability, breathable, antibacterial, toxicity, mechanical properties.

The quasi-static compressive properties of SiCp/ZAlCu5Mn composite foams were tested by compressive test.
The research of mechanical property is the basic for the application of the structure materials[2].
As a new type of structural materials with a variety of good performance, foam aluminum’s application in industry must rely on research of its mechanical properties.
Static compression properties of foamed samples were tested with invariable strain rates on CMT5105 material test system.
Therefore, the factors, which affect the height and length of the collapse plateau region, will have effect on the energy absorption ability of foams.

Preparation of alumina based ceramic foam is studied to observe the effect of the addition of corn starch on its physical, mechanical and morphological properties.
Its actual cell shape depends on several factors, including the fabrication process.
Linear shrinkage was affected by the increasing amount of corn starch.
Porosity is the main factor that affects the performance of ceramic foams [9].
Naghavi, Different pore size alumina foams and study of their mechanical properties, Ceramics - Silikaty 59 (2015) 6-9.

Out of the monitored properties, the specific lightness of paper surface showed the greatest stability (97.8%).
The papers exposed to light for a long time change their optical, mechanical and physicochemical properties.
The changes in optical, mechanical and physicochemical properties are mainly due to the effect of heavy active ultraviolet part of the incident light.
Summary The obtained results allow us to conclude that even current wood-free office paper of high quality when exposed to UV radiation shows the changes in their properties.
In: Lejeune, A., Deprez, T., Cellulose: Structure and Properties, Derivates and Industrial Uses.

However, parts sintered by the given materials are usually presence poor dimensional accuracy and low mechanical properties.These materials can not prototype industry production directly.
Polyamide (PA) is a semi-crystalline polymer with the attributes including low melt viscosity and well mechanical properties.
High-density polyethylene (HDPE) is a high-crystalline and non-polar thermoplastic resin with well thermal physics and mechanical properties.
They also analysed the mechanical properties of the sinter specimens, but the dimensional accuracy of the sinter parts were not considered in their studies.
The bonding between the layers will be very infirm that affect the part mechanics properties greatly if the thickness was too large for sintering.