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Introduction A leak in pipeline can cause immediate loss of flowing materials at the leaking spot which in turn leads to the decrease of fluid density and produces a transient pressure drop and a difference in speed, which the sensors installed on both sides of leak spot or in the pump station can collect pressure wave signal, locate the leak and determine the leakage level by using signal processing methods.
When a pipeline leak happens, the loss of material at the leaking spot will result in the decrease of density there and a corresponding decrease of pressure.
[2] Cai Zhen-min, The Pipelines Leakage Detection Based on Wavelet Analysis and Wave Propagation Method, Mechanical Science and Technology 2001, 20-38
[3] Xia Hai-bo, ZHANG Lai-bin, WANG Zhao-hui, Application of wavelet transform to signal detection of pipeline leakage, Journal of the University of Petroleum, China（Edition of Natural Science）2003. 02
Method of fault pat tern recognition based on Laplacian eigenmaps, Journal of System Simulation, 2008, 20 (20):5710-5713.

Materials and Methods China's Ministry of Environmental Protection (MEP) is responsible for measuring the level of air pollution in China.
Research on Corrent Pollution Sataus and Pollution Characteristics of PM2.5 in China [J],Research of Enviromental Sciences, Vol. 13, No. 1, (2000). p. 1-5
Journal of Environmental Quality 26, (1997).
Science.
Journal of Environmental Economics and Management.

Materials and Methods Materials.
The composition of the materials can be found in Table 1.
Chemical composition of the materials used in % weight.
Colegrove, „Wire + Arc Additive Manufacturing“, Materials Science and Technology, Bd. 32, Nr. 7, S. 641–647, Jan. 2016, doi: 10.1179/1743284715Y.0000000073
Jäger, „Prediction of the evolution of material properties during the AM process based on the FEM simulation and experimental results“, in Materials Research Proceedings, Materials Research Forum LLC, Mai 2024, S. 40–49. doi: 10.21741/9781644903131-5

Wei: Chinese Journal of Inorganic Chemistry, Vol. 24 (2008) No.4, pp.520-526.
Lyapina: Russian Journal of Applied Chemistry,Vol. 74 (2001) No.7, pp.1098-1102
Gu: Rare Metal Material and Engineering, Vol. 33 (2004) No.9, pp.957-962.
Duan: Journal of Inclusion Phenomena and Macrocyclic Chemistry, Vol. 26 (2005) No.(3-4), pp.1273-1276 (in Chinese) [19] X.
Zhang: Journal of Analytical Chemistry, Vol. 34 (2006), pp.529-532.

Materials In the present study, two AA5083 aluminum alloy grades were investigated, a superplastic and a commercial grade.
[3] Ghiotti A, Bruschi S, Borsetto F, Tribological characteristics of high strength steel sheets under hot stamping conditions, Journal of Materials Processing Technology, 211/11 (2011) 1694-1700
[4] Toros S., Ozturk F. and Ilyas Kacar, Review of warm forming of aluminum–magnesium alloys, Journal of Materials Processing Technology, 207/1-3 (2008) 1–12
Taleff, Ductility of an aluminum-4.4 wt. pct. magnesium alloy at warm- and hot-working temperatures, Materials Science and Engineering A, 527 (2010) 3822-3828
McNelley, Deformation and failure of a superplastic AA5083 aluminum material with a cu addition, Metallurgical and Materials Transactions A, 37/9 (2006) 2727-2738.

New Building Materials, 331(10):15-18.
About Materials and Binders Manufacture[J].
Journal of Building Materials,13(4):208-212.
Journal of Air Force Engineering University(Natural Science Edition) ,11(3):1-5. ( in Chinese)
ACI Materials Journal, 30(2):159-167.

A micro-cavity can modify the spontaneous emission properties of the materials inside spatially and spectrally owing to the alteration of the optical mode density within it.
As a new laser gain media, organic semiconductor materials have been paid attention to in recent years.
“Transform-limited, narrow-line width lasing action in organic semiconductor microcavities” ,Science, 279(23),553(1998)
Semiconducting( conjugated) polymers as materials for solid-state lasers, Adv.
[11] Yokoyama H, Physics and device applications of optical microcavities, Science, 256(1992)66-70

Homogeneous distribution of ceramic particles in a fine grained matrix can yield good mechanical and wear resistance properties of composite materials.
Hence, wear resistance of soft materials can be improved by developing a composite layer near the surface region, which can exhibit enhanced wear and erosion resistance without degrading toughness.
Zheng, Damping capacities and tensile properties in Grp/AZ91 and SiCp/Grp/AZ91 magnesium matrix composites, Materials Science and Engineering A 527 (2010) 7873–7877
Journal of Material Processing Technology, 211(2011) 750–758
Faraji, P.Asadi, Characterization of AZ91/alumina nanocomposite produced by FSP, Materials Science and Engineering A 528 (2011) 2431–2440.

By adding appropriate amount of rubber particles, it can significantly improve mortar performance such as the brittleness, the sound absorption, the heat insulation performance, the impact resistance and the durability of the cement-based materials on the basis of keeping the mortar’s mechanical properties [2].
The construction technology of the crumb rubber modified cement-based materials is simple, so it has good popularization and application prospects.
Experiments Materials and properties The performance indexes of grade 42.5 ordinary Portland cement are shown in Table 1.
Thus the material reduces strength, produces deformation cracks and even affects the structural work.
Journal of Southeast University (Natural Science Edition).

Experiments Material Properties.
Experimental materials conclude polyvinyl alcohol (PVA) fiber, cement, silica sand, superplasticizer, fly ash, silica fume and HPMC.
The modified polycarboxylates superplasticizer manufactured by Sika Building Materials Co., Ltd.
The training data in this study are 91groups of PVA-ECC with different fiber volume rates and different mineral adding materials and the times of freeze-thaw cycles; the predicted data are another 12 ones.
ACI Materials Journal, Vol.100 (2003), p.511 [3] Atsuhisa O, Tetsuo H, Hideki H.