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The article summarized the ball screw causes of the vibration, noise, comprehensive both at home and abroad research results to the ball screw vibration and noise generating mechanism .Then pointed out that the ball screw noise generation is the main reason of the screw groove waveness arouses nut forced vibration.Introduced the latest progress of the ball screw drive system modeling and the vibration model analysis,specific introduces several methods of reducing vibration and noise reduction.
Antivibration and Noise Reduction Method (1) Improve the precision of the ball screw The ball screw precision shortage is the most important factor in the reason of generates noise, and inevitable happened in the mechanical processing.
For the selected ball screws, have data show that the noise level is in proportion with dN values (d is ball rail center diameter, N is rotation number) of the logarithm, so we should the choice the lower value of the dN.
(6) Other noise reduction measures Mainly includes to ball nuts surrounding configuration noise casing; Outside of intubations fixed high strength engineering plastic and will guide bead tube covered completely exposed portion; In the ball screw shaft trip ends configuration buffer shock absorbers.

The reduction of Jc with the applied magnetic field requires further improvements to reduce weak links.
These data show that the higher densification leads to higher values of Jc, due to higher density of pinning centers.
The magnetic field dependence of Jc is approximately exponential with field [9], and leads to a high reduction: For sample MB1-9, with highest Jc, 0.6x 10 6 A/cm2 at 0 Tesla, it reduces to 0.3x 10 6 A/cm 2 at 1 Tesla and to 0.11 x 10 6 A/cm2 at 2 Tesla.
This reduction is comparable to the one found in other studies and shows that improvements have still to be done in the materials processing in order to reduce the weak links.

The measurement from the test model verified the predicted data and a yearly potential from nocturnal cooling in this region was established.
The calculated value of Two inherit certain amount of uncertainty due to the uncertainty of input data into the mathematical model such as the actual wetted area of the roof, climatic data such as cloud cover, wind speed and ambient air temperature, relative humidity and dew point.
Measured and calculated temperatures shown together with climatic data for night cooling on 28th May 2015 in Kuching, Sarawak.
The data was input to the model to simulate the 7pm-7am night sky cooling for each month.
Monthly prediction of final Two at 7am in the morning for a year was established from the 5 years climatic data of the this region.

In order to analyze deposits model, the methods adopted includes that arrangement of existing geophysical and geochemical exploration results, familiar with the former research results, and based on the collection of data, studying comprehensively the geological characteristics of deposits, discussing the deposits genesis.
It found that metal mineral combination about the Cu(Au) ore body is pyrite + chalcopyrite + molybdenite(less) + magnetite (less), and transit to a peripheral area of pyrite + chalcopyrite + magnetite, to sphalerite + chalcopyrite + pyrite + lead ore (less) from inside to outside in porphyries body in Xiongcun by studying, which reflected the rock permeability and diffusion about the hydrothermal system of ore-bearing porphyry, all this caused by different types of mineralization process due to temperature and pressure reduction.
Deficiency is a lack of data, it is very difficult to distinguish which kind of exploration method played a key role, the division includes both the exploration methods and working train of thought, prospecting cognition.
Research methods: ①arrangement of existing geophysical and geochemical exploration results, familiar with the former research results. based on the collection of data, studying comprehensively the geological characteristics of deposits, methods adopted the field observation and indoor optical slice identification, studying synthetically geological features in the area, which including the regional geological background, the ore types, ore fabric and material composition, metallogenic elements combination, and Wall rock alteration characteristics, and so on. ③ studying and discussing the deposits genesis about Xiongcun Cu (Au) deposits, summarizing metallogenic regularity and Prospecting model.
It is divided into 6 categories: ①Geological mapping method (77%).②Geochemical methods (69%).③geophysical method (47%).④theory model of prospecting method (24%).⑤Remote sensing method (12%).⑥Drilling method (11%). the newly discovered deposits in main metallogenic belt in Tibet since the geology survey beginning (1999) that It is difficult to completely identify which kinds of exploration methods played a key role due to the lack of systematic data.

The research and application of optimizing the system efficiency will drive the development of building integrated PV and promote building energy efficiency and emission reduction.
For building integrated PV, the industry generally as shown in Fig. 6, to estimate the different orientation of the PV efficiency .In local best inclination towards 100% as standard, the different direction of PV phalanx efficiency will have different degree of reduction.
In order to get a more scientific and detailed component installation area, according to nearly 15 years of meteorological data in the Nanjing area, combined with the conditions of the above theory and the actual irradiation using PV system design and analysis software, in the shadow analysis model on the basis of the above, for each area of the solar radiation conducted a more detailed analysis of the radiation.

Data recorded included room temperature, inside and outside surfaces temperatures of all walls, and solar intensity.
They include a reduction in construction time and cost.
Data were recorded using a data logger and sampled every 5 min during 24 h.
to the temperature data recorded during the day, the corresponding conduction heat transfer rate was the calculated and shown in Fig. 7.
Therefore, the mean energy consumption reduction corresponding to a 1°C increase of the set-point (from 22 to28°C) is about 6.14%.

An analysis of the mechanical data in light of the standard deformation mechanisms revealed that deformation of the sample after 4 passes was governed by dislocation climb while grain boundary sliding attributed to LTS of the sample after 8 passes.
For 5154 Al alloy, ECAP was preformed up to 4 passes with route Bc and subsequent cold rolling was carried out up to a total reduction of 70 % with 0.2 mm reduction per rolling pass.
The mechanical data of the alloy after 4 passes were fitted into a straight line with a slope of ~ 0.2, i.e.
Contrarily, the mechanical data of the alloy after 8 passes exhibited the sigmoidal behavior manifested by the presence of the three distinct regions. m was ∼0.1 at low (Region I, ε& < 3×10 -4 s-1) and high strain rates (Region III, 2×10-3 s-1 < &ε ).
These include (a) the mechanical data implied that the deformation of the ECAP sample was governed by dislocation viscous glide while that of the ECAP+CR (70 %) sample was dominated by GBS and (b) the deformation in the ECAP sample was localized at the initial deformation stage and it became more severely localized as deformation proceeded, but GBS Fig. 5 TEM micrographs of (a) the ECAP sample and (b) the ECAP+CR (70%) sample of 5154 Al occurred predominantly from the initial deformation stage of the ECAP+CR (70 %) sample, resulting relatively uniform deformation throughout the sample. 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 0 200 400 600 800 1000 1200 elongation to failure , % initial strain rate , s -1 modified 5154 Al T = 723K ECAP ECAP+CR 10 -6 10 -5 10 -4 10 -3 10 -2 10 -1 10 0 10 1 10 100 2 200 0.33 1 0.45 1 stress , MPa strain rate , s -1 Al-3.2Mg-0.13Sc T = 723 K ECAP

Data obtained by this method are of use only in predicting the behaviour of these pipes under condition of temperature, time, method of loading and stress situation.
A notable reduction in elastic modulus occurred at 100% of UEWS (180MPa), when possibly cracks start to develop parallel to the fibres, the reduction was approximately 14% of the virgin pipe.
Reduction in elastic modulus of the filament wound pipe under 2H:1A stress ratio during UEWS test .
At 65°C the strength is generally reduced, with the greatest reduction occurring in the axial load sector, which was about 10%.
This reduction has shrank the failure envelope towards the origin (see fig. 5).

TPST Piyungan encountering problem when the quantity of the incoming waste was not proportional to the reduction of the waste in its final processing.
The WtE technology gives additional uses of decreasing need for landfill area, waste quantity reduction, the reduction of the long distance transportation cost to the integrated waste management site, and the reduction of environmental pollution resulting from the waste processing [9].
Knowledge of Proper Waste Processing Method (left), Opinion of the Best Waste Processing Method (right), Perception of Advanced Waste Processing (Below) (Source: Primary Data, 2019) The majority of the waste pickers in many countries are females, children, and elderly people [12], as well as in TPST Piyungan.
Thermal technology were proposed as alternative in waste processing because of its economic feasibility and require less area with optimal waste reduction percentage [17].
Budhijanto, Municipal Solid Waste Management in Indonesia - A Study about Selection of Proper Solid Waste Reduction Method in D.I.

To obtain required accuracy of data transfer between scale levels, 3 windows (0.5×0.4 mm with 100 elements) were included to mesh the rod cross section.
At this point, in the real production at OJSC "MMK-Metiz" reduction of 1-2 mm and die angle of 18 degrees are used.
RVE shows the theoretical possibility of 1.5 time’s increase of reduction with relatively homogenous deformation of the whole rod cross-section.
Influence of reduction degree on the distribution of compressive radial stresses and strains in the central layer Fig. 10.
Therefore, the SSRVE concept was applied in the present paper and the following goals were reached: 1) simplifying and automating the process of creating a microstructure model; 2) reduction of the computing time; 3) reduction of the required computational resources.