scholarly journals Vibration Exposure and Transmissibility on Dentist’s Anatomy: A Study of Micro Motors and Air-Turbines

2021 ◽  
Vol 18 (8) ◽  
pp. 4084
Author(s):  
Harish Kumar Banga ◽  
Pankaj Goel ◽  
Raman Kumar ◽  
Vikas Kumar ◽  
Parveen Kalra ◽  
...  
Keyword(s):  
Research Work ◽  
High Amplitude ◽  
Vibration Exposure ◽  
Body Parts ◽  
Descriptive Research ◽  
Air Turbine ◽  
Test Of Homogeneity ◽  
Hand Piece ◽  
Vibration Transmissibility ◽  
Levene Test

The use of dental hand pieces endanger dentists to vibration exposure as they are subjected to very high amplitude and vibration frequency. This paper has envisaged a comparative analysis of vibration amplitudes and transmissibility during idling and drilling with micro motor (MM) and air-turbine (AT) hand pieces. The study aims to identify the mean difference in vibration amplitudes during idling, explore different grasp forces while drilling with irrigant injection by the dentist, and various vibration transmission of these hand pieces. The study utilized 22 separate frequency resonances on two new and eight used MMs and two new and eight used ATs of different brands by observing the investigator at 16 different dentist clinics. The study adopted a descriptive research design with non–probability sampling techniques for selecting dentists and hand pieces. Statistical methods like Levene Test of Homogeneity, Welch ANOVA, independent t-test, and Games–Howell test were utilized with SPSS version 22 and MS-Excel. The results reveal that vibration amplitudes and vibration transmissibility when measured at position 2 are higher than in another position 1. Vibrations during idling for used MMs are more than AT hand pieces, and the used MM (MUD) and used AT (AUA) hand pieces differ due to their obsolescence and over-usage. Vibration amplitudes increase every time with the tightening of grasping of the hand piece. Vibration amplitudes for each grasping style of MM hand piece differ from all other grasping styles of AT hand pieces. Routine exposure to consistent vibrations has ill physical, mental, and psychological effects on dentists. The used hand pieces more hazardous as compared to newer ones. The study suggests that these hand pieces must be replaced periodically, sufficient to break between two operations, especially after every hand piece usage. Hence, the present research work can be further extended by creating some control groups among dentists and then studying the vibration amplitude exposure of various dental hand pieces and subsequent transmissibility to their body parts.

scholarly journals Effect of the Lubrication on the Autoclaving of the Dental Air-Turbine Hand-Piece

2014 ◽  
Vol 84 (6) ◽  
pp. 621-628
Author(s):  
Kaoru Tamazawa ◽  
Yoshinori Tamazawa ◽  
Hidetoshi Shimauchi
Keyword(s):  
Air Turbine ◽  
Hand Piece

Phytoremediation of contaminated soil Lead and Cadmium by Brassica júncea (L.) Czern plant

2020 ◽  
Vol 5 (4) ◽  
pp. 110-120
Author(s):  
Qunshan Wei ◽  
◽  
Bilal . ◽  
Muhammad Noman ◽  
Zhemin Shen ◽  
...  
Keyword(s):  
Brassica Juncea ◽  
Contaminated Soil ◽  
Contaminated Soils ◽  
Plant Biomass ◽  
Research Work ◽  
Alluvial Soil ◽  
Body Parts ◽  
Polluted Soils ◽  
Lead And Cadmium ◽  
Allowable Range

Many remediating strategies are used for polluted soils, however, but mostly the essential phytoremediation is a less expensive, organically satisfying technique that is generally reasonable for various countries. Pot tests were managed to dissect the Brassica júncea plant biomass cultivated on Pb as well as Cd polluted soils as well to survey its ampleness for the evacuation of Pb and Cd. Samples of picked plants developed at a blend of alluvial soil and sand were moved with vessel of pots the earth finishing extents as well allowed make with time regenerative development. Through acid digestion, Pb and Cd extraction was settled from the plant. Consequently, they were collected and afterwards examined for chosen metals through utilizing Atomic Absorption Spectrometry (AAS). Generally, the current examination results demonstrated that no hyperaccumulators of Pb as well Cd were recognized in the region. Body parts of the plant were categorized as Pb low accumulators, moderate accumulators and excluder, as well as Cd low accumulator, excluder. Additionally, Cd concentration was high up than the allowable range in species of plant. In plants, allowable range of Pb and Cd is 0.2 - 20 and 0.1 -2.4 mg kg – 1. In Brassica júncea plant the Pb as well Cd both were no hyperaccumulators. Hence, this local plant had the suitable ability to use for phytoremediation of contaminated soils around the Hayatabad Industrial area, Peshawar. All experimental Results demonstrated that from the medium of soil by Brassica júncea (L.) Czern plant the maximum lead and cadmium removals were 94 % and 94.26 %, respectively in the open environment, while in the control environment this removal was 82 % for Pb and 93.16 % for Cd .The present research work observes that brassica júncea (L.) Czern plant was more helpful for Cd take-up contrasted with Pb, and thus it is capacity we suggest Pb as well Cd for remediation from polluted soils. Keywords: Lead, Cadmium, Contaminated soil, Removal

Modeling and Dynamics of Magnetically Repulsive Negative Stiffness Permanent Magnetic Array for Precision Air/Magnetic Composite Vibration Isolation

2021 ◽  
Author(s):  
Yamin Zhao ◽  
Junning Cui ◽  
Limin Zou ◽  
Zhongyi Cheng
Keyword(s):  
Vibration Isolation ◽  
Permanent Magnets ◽  
Structural Parameters ◽  
Low Frequency ◽  
Vertical Direction ◽  
High Amplitude ◽  
Negative Stiffness ◽  
Magnetic Composite ◽  
Experimental Systems ◽  
Vibration Transmissibility

To reduce the natural frequency of air isolators and realize low or ultra-low frequency air/magnetic composite vibration isolation with large payloads, a magnetically repulsive negative stiffness permanent magnetic array (MRNSPMA) is proposed. Specifically, we utilize cuboidal permanent magnets to form a spatial array that is mechanically repulsive in the horizontal direction and structurally parallel in the vertical direction. The superiority of MRNSPMA in achieving high amplitude negative stiffness is verified. Furthermore, the effects of structural parameters on vibration transmissibility under the base and force excitations are investigated with the introduction of MRNSPMA. The displacement transmissibility, the force transmissibility and the frequency corresponding to the peak transmissibility are significantly reduced, validating the promise of MRNSPMA for improving the isolation performance of cutting-edge scientific experimental systems and facilities.

Assessment of Hand-Arm Vibration Exposure among Motorcyclist in Malaysia

2014 ◽  
Vol 663 ◽  
pp. 395-399 ◽  
Author(s):  
Darliana Mohamad ◽  
Baba Md Deros ◽  
Dian Darina Indah Daruis ◽  
Nor Kamaliana Khamis ◽  
Nurul Hidayah Md Tahir
Keyword(s):  
Prolonged Exposure ◽  
The Body ◽  
Vibration Exposure ◽  
Body Parts ◽  
Exposure Effect ◽  
Road Users ◽  
Pave Road ◽  
Road Type ◽  
Body Discomfort ◽  
The Right

Motorcyclists are road users that highly exposed to hand-arm vibration that may contribute to body discomfort and fatigue that eventually will lead to road accidents and injuries. The two main objectives of this study are to identify the body parts that experience discomfort among motorcyclist and to understand the vibration exposure effect on different road types. In this study, two research methodologies were used; first, a survey questionnaire of 100 motorcyclists and second, an experimental study on hand-arm vibration (HAV) measurement exposed on motorcyclist using accelerometer mounted on the right side handlebars of the motorcycle. Two male respondents with a different weight range, 45-65 kg and >70 kg are selected for this experiment. The experiment was conducted on two different types of roads: tarmac road and pave road within a speed limit of 20-40 m/s2. Results of the study showed that the motorcyclist usually experienced body discomfort at lower back, upper back, wrist, buttock and neck area. The root-mean-square (r.m.s) frequency-weighted acceleration on the handlebars of the motorcycles was in the range of 0.07 m/s r.m.s for the tarmac road and 0.42 m/s r.m.s for the pave road. This value shows that different road type is affecting the vibration exposed to the motorcyclist. Clearly there’s a vibration felt by the motorcyclist but not on the degree of causing pain but a prolonged exposure to this vibration may induce discomfort and injuries.

scholarly journals Keefektifan Permainan Monopoli IPA terhadap Kemampuan Kognitif dan Sikap Ilmiah Siswa SD

2019 ◽  
Vol 2 (1) ◽  
pp. 29-32
Author(s):  
Ela Suryani
Keyword(s):  
T Test ◽  
Test Of Homogeneity ◽  
Kolmogorov Smirnov ◽  
Levene Test

Pembelajaran IPA di kelas IV SDN Wujil 01 menunjukkan kemampuan kognitif siswa yang masih dibawah KKM sebanyak 76% dan sikap ilmiah siswa yang masih rendah sebesar 18%. Oleh karena itu, perlu adanya solusi inovasi perbaikan pembelajaran IPA di kelas yaitu media dengan menggabungkan unsur permainan. Salah satunya adalah permainan monopoli IPA. Penelitian ini bertujuan untuk mengetahui seberapa efektif penggunaan permainan monopoli IPA terhadap kemampuan kognitif dan sikap ilmiah siswa SD. Selain itu, bisa dijadikan strategi bagi guru SD maupun calon guru SD dalam mempersiapkan proses pembelajaran IPA yang menyenangkan. Jenis penelitian yang digunakan adalah penelitian eksperimen dengan desain two-group posttest only desain. Teknik pengumpulan data yang digunakan adalah dokumentasi, tes, dan observasi. Analisis data meliputi 1) instrumen tes uji coba menggunakan program aplikasi Anates V.4 meliputi validitas tes, uji reabilitas, daya pembeda saoal, dan tingkat kesukaran soal; 2) uji normalitas uji kolmogorov-smirnov dalam software PASW Statistics 18. 3) uji homogenitas dalam penelitian ini menggunakan uji levene test (test of homogeneity of variences) dalam software PASW Statistics 18; 4) kesamaan rata-rata menggunakan independent sample t-test dengan software PASW Statistics 18. Hasil penelitian menunjukkan bahwa pembelajaran menggunakan permainan monopoli IPA efektif dalam meningkatkan kemampuan kognitif dan sikap ilmiah siswa SD. Hal ini ditunjukkan dari taraf signifikansi  yaitu 0.008 dan 0.005 < 0.05 sedangkan rata-rata nilai pembelajaran IPA pada kelas eksperimen dengan menggunakan permainan monopoli IPA lebih tinggi daripada rata-rata nilai pembelajaran kelas kontrol (83.55 > 71.26). Selain itu, sikap ilmiah yang dimiliki siswa SD selama proses pembelajaran menggunakan permainan monopoli IPA dalam kategori sangat baik dengan presenase 84,02%.

scholarly journals ETOS KERJA TUTOR KABUPATEN HULU SUNGAI TENGAH

Jurnal Socius ◽  
2013 ◽  
Vol 2 (2) ◽  
Author(s):  
Siti Aisyah
Keyword(s):  
Research Work ◽  
Average Score ◽  
Descriptive Research ◽  
The Status ◽  
Descriptive Approach ◽  
Research Questions ◽  
Quantitative Descriptive

This study aims to determine the work spirit of lecture in Hulu Sungai Tengah. This study includes a quantitative descriptive research. Quantitative descriptive approach involves collecting data to answer several research questions related to the status of the study subjects were examined and denoted by using numbers. The data examined in this study is a tutor at Hulu Sungai Tengah, amounting to 30 tutors. Based on this research, work spirit of  lecture in Hulu Sungai Tengah.  In generally fall into either category, it can be evidenced by ownership category of each aspect. This is supported by advanced data, which is an average score for each aspect of the data is higher than the average edial. Most aspects contribute to the formation of tutors work spirit is a commitment (93%) and interest (70%) who claimed to have a high commitment and interest. Aspects of motivation is the most minor aspect in the formation work spirit of lectures in Hulu Sungai Tengah that only 37% had high motivation.Key words: Work spirit, and lecture

scholarly journals An Approach to the Effects of Modern Art on the Evolution of Iranian Contemporary Typography

2020 ◽  
Vol 5 (23) ◽  
pp. 189-196
Author(s):  
Maryam Rafiei ◽  
Jamshid Arasteh
Keyword(s):  
Visual Communication ◽  
Modern Art ◽  
Research Work ◽  
Structural Features ◽  
Visual Language ◽  
Social Conditions ◽  
The Other ◽  
Descriptive Research ◽  
Iranian Art ◽  
Transfer Of Information

Today, letter design is no longer just a way to convey information, its visual and structural features is not limited to a particular aspect of visual language, in addition, the design of letters is a method that is always influenced by the content and thought, it is placed in different cultural and social conditions and reflected in unlimited aesthetic forms. Situation that occurs with Iranian literature that owes its value to the writings and the words. On the other hand, in the field of art, especially the art of letter design, it is this writing that plays the central role. Almost more than a century ago, new and modern phenomena slowly came to Iran, and Iranian artists began to use modern art. What is gleaned from the research is the introduction of typography as a powerful and usable tool not only in the international community but also as an art of communication on the Iranian border and examining its most important function; visual communication and the transfer of information and content. It is also discovered how the forms of typography evolve and its impact on contemporary Iranian art. The descriptive research work was carried out through the process of reviewing and collecting information from the library documents.

Challenges faced by older people in a district of Uttar Pradesh: a qualitative study

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Avanish Bhai Patel
Keyword(s):  
Older People ◽  
Social Economic ◽  
Research Work ◽  
Uttar Pradesh ◽  
Later Life ◽  
Well Being ◽  
Primary Data ◽  
Content Type ◽  
Descriptive Research ◽  
Qualitative Descriptive

Purpose The steady rise in aged population has brought many challenges such as social, economic and health care that confront of the older people in their later life. The purpose of this study is to understand the nature of challenges among the older people and to assess the role of social security programmes for the welfare of the older people. The qualitative descriptive research has been applied in this paper. Design/methodology/approach The qualitative descriptive research has been applied in this paper. The study was conducted in a sample of 220 elderly living in Lucknow, Uttar Pradesh, using purposive sampling. The study was based on interviews. The order of questions and samples depended on the information flow during the interviews. The purposes of using the qualitative descriptive research in the present study are to satisfy the researcher’s curiosity and desire for better understanding to discuss the challenges faced by older people (these challenges are social vulnerability, poor economic conditions, poor health and no familiarity with government programmes), to understand the practicability of the study in extensive way and to explain why any phenomenon occurs or why older people face problems in later life. Findings The first finding demonstrates that the different challenges among older people such as social, economic and health challenges are affecting their way of life and sense of well-being and are fracturing their social bonds from the family and society. The second finding indicates that only 46.3% older people are benefitted from government pension programmes schemes. While the numbers of older people are unknown from other government welfare programmes such as health programmes, concession for older people and maintenance and welfare of parent and senior citizen act are not able to work properly due to lack of awareness and lack of proper communication between older people and government bodies. Originality/value This is an original work of the author. The research work is based on primary data that examine the nature of challenges such as health, economic and social challenges faced by older people in later life and impact of these problems on the well-being of older people.

scholarly journals Vibration transmissibility and apparent mass changes from vertical whole-body vibration exposure during stationary and propelled walking

2021 ◽  
Vol 90 ◽  
pp. 103283
Author(s):  
Delphine Chadefaux ◽  
Alex P. Moorhead ◽  
Pietro Marzaroli ◽  
Stefano Marelli ◽  
Enrico Marchetti ◽  
...  
Keyword(s):  
Whole Body Vibration ◽  
Whole Body ◽  
Vibration Exposure ◽  
Apparent Mass ◽  
Body Vibration ◽  
Vibration Transmissibility
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