iosr-JMCE   Volume-20 ~ Issue-4 ~ July – Aug. 2023

Abstract: With the improvement of scientific and technological level, digital printing technology has achieved great development. Among them, piezoelectric inkjet printing technology has the characteristics of high precision, good stability and strong adaptability. Because of its remarkable characteristics, piezoelectric drive jet liquid technology is also widely used in large-scale inkjet painting, biomedicine, 3D printing and other fields. The drive input in piezoelectric inkjet technology is provided by piezoelectric ceramics, so the driving performance of piezoelectric ceramics determines the accuracy and stability of inkjet. For the needs of jet fluids and liquid cavities, ANSYS software is used......

Keywords: Droplet; Finite element analysis; Piezoelectric ceramics; Transient analysis

[1] Kim M K, Kang H S, Kang KT, Et Al. The Fluid Property Dependency On Ink Jetting Characteristics[C]. Mechatronics, 2005. ICM '05. IEE International Conference On. IEEE, 2005: 258-260.
[2] Tseng A A, Lee M H, Zhao B. Design And Operation Of A Droplet Deposition System For Freeform Fabrication Of Metal Parts[J]. Journal Of Engineering Materials And Technology,2001,123:74-84.
[3] Li S Y, Xia H J, Zhang X W, Et Al. Machinery Design& Manufacture,2021(7): 255-258, 263.
[4] Silver A. Five Innovative Ways To Use 3D Printing In The Laboratory. Nature, 2019, 565(7737): 123-124.
[5] Paul C. 3D Packaging And Supply Chain Management[C]. Microelectronics And Packaging Conference. Rimini, Italy: IEEE,2009.
[6] Zhou Yanguo, Chen Yunmin, Ding Haojiang. Analytical Modeling And Free Vibration Piezoelectric Bimorph[J]. Journal Of Zhejiang University SCIENCE 2005,6A(9):938 -944.

Abstract: Clay shale at the nation's capital (IKN) is a type of clay that is easy to expand when it comes into contact with water because of the montmorillonite clay mineral it contains. The effect of water also causes a decrease in strength in the clay shale. As a result of the clay shale behavior, some buildings become damaged or landslides occur on the slope. The soil stabilization method with a cement binder is one solution to improve the detrimental properties of the clay shale. We determine the mineralogical compositions of shales primarily by advanced X-ray powder diffraction analyses. These include determinations of the bulk (whole rock) compositions of shales by full pattern.....

Keywords: Clay Shale, Durability, Slaking, Stability, Sloping

[1]. Agustawijaya, D.S. (2004). "Modelled Mechanisms In The Slake-Durability Test For Soft Rocks." Civil Engineering Dimen- Sion, 5(2), 87-92. Https://Doi.Org/10.9744/Ced.5.2.Pp. 87-92
[2]. Aksoy, M., Ankara, H., And Kandemir, S.Y. (2019). "Preparation And Evaluation Of Spherical Samples For Slake Durability In- Dex Test." International Journal Of Environmental Science And Technology, 16(9), 5243-5250.Https://Doi.Org/10.1007/S13762-019-02254-1
[3]. Alatas, I.M., Kamaruddin, S.A., Nazir, R., Irsyam, M., And Himawan, A. (2015). "Shear Strength Degradation Of Sema- Rang Bawen Clay Shale Due To Weathering Process." Jurnal Teknologi, 77(11), 109-118. Https://Doi.Org/10.11113/Jt.V77.6429
[4]. Ankara, H., Kandemir, S.Y., And Çiçek, F. (2015). "Compression Of Slake Durability Index (SDI) Values Of Sphere And Rounded Marl Samples." Procedia Earth And Planetary Science, 15, 93-98. Https://Doi.Org/10.1016/J.Proeps.2015.08.024
[5]. ASTM (2000). D1633-00 Standard Test Methods For Compres- Sive Strength Of Molded Soil-Cement Cylinders. West Con- Shohocken, Pennsylvania, USA: ASTM International. Https://Doi.Org/10.1520/D1633-00

Abstract: During the COVID 19 pandemic, negative pressure isolation rooms have been widely utilized as a crucial measure for infection control, effectively mitigating the crisis. Numerous studies have demonstrated that aerosol transmission plays a significant role in the spread of viruses. This study aims to predict the dissemination, distribution patterns, and infection risks associated with viru ses carried by particles in aerosols within negative pressure isolation rooms. The study develops a model of aerosol transmission in these rooms using Fluent software....

Keywords: negative pressure isolation rooms; aerosol transmission; virus spread

[1]. Wang , Y ., Liu , Z ., Liu , H ., Wu , M ., He , J ., Cao , G . (2022). Droplet Aerosols Transportation And Deposition For Three Respiratory
Behaviors In A Typical Negative Pressure Isolation Ward. Building And Environment , 219,
[2]. Vuorinen , V ., Aarnio , M ., Alava , M ., Alopaeus , V ., Atanasova , N ., Auvinen , M ., Balasubramanian , N ., Bordbar , H ., Erästö , P ., Grande ,
R ., Hayward , N ., Hellsten , A ., Hostikka , S ., Hokkanen , J ., Kaario , O ., Ka rvinen , A ., Kivistö , I ., Korhonen , M ., Kosonen , R ., Kuusela ,
J ., Lestinen , S ., ... Österberg , M . (2020). Modelling Aerosol Transport And Virus Exposure With Numerical Simulations In Relat ion
To SARS Cov 2 Transmission By Inhalation Indoors. Safety Science , 130,
[3]. Chao , C . Y . H ., Wan , M . P ., Morawska , L ., Johnson , G . R ., Ristovski , Z . D ., Hargreaves , M ., Mengersen , K ., Corbett , S ., Li , Y ., Xie ,
X ., Katoshevski , D . (2009). Characterization Of Expiration Air Jets And Droplet Size Distributions Immediately At The Mouth
Opening. Journal Of Aerosol Science , 40(2), 122 133.