จำนวน Repository ( 2131 )
การพัฒนาและผลิตอิฐบล็อกมวลเบาโดยการผสมเส้นใยธรรมชาติ
In this study we investigated on the mechanical properties and physical properties of light weight block mixed with banana fibers. For the cost effective purpose and environmental friendly product banana fibers which is rich in fiber was used as a precursor in producing light weight block. In this framework a series of blocks were fabricated using banana fibers for instead different raw material involve cement and sand for 28 days incubation. The result show that the block with mix banana fiber was replaced cement in 2.5 %wt has the density value and compressive strength is 1376 kg/m3 and 62.25 kg/cm3 respectively. While water absorption and the maximum shrinkage limit value are 32.86 % and 0.12 % respectively were obtain from the samples mixing 7.5% of banana fibers. After examination of of Thai Industrial Standard (TIS 1505- 2541) the result illustrated the value are standard. It can be concluded that the light weight block mixed banana fibers in ratio of sand: cement: lime: gypsum: aluminum powder: banana fibers are 50: 27.5 : 9 : 9 : 2 : 2.5 will also be used as an alternative precursor materials for producing the light weight block by natural raw materials for cost effective purpose.
การศึกษาแก้วเซรามิกชีวภาพที่ประกอบด้วยผลึกเฟอร์โรแมกเนติกระดับนาโนจากระบบที่มีและไม่มีซิลิกาเป็นองค์ประกอบด้วยวิธีอินคอเปอเรชัน
The aim of this work was to study the magnetic properties of magnetic glass-ceramics with composition system SiO2-CaO-Na2O-P2O5-BaO-Fe2O3. The magnetic glass–ceramics were prepared by conventional melting at 1300oC for 2 h of the coprecipitation derived starting products and heat treated at different temperatures. The structure and microstructure of the samples were characterized by X-ray diffraction energy dispersive X-ray analysis (EDXA) and scanning electron microscopy. The magnetic measurement showed that the samples which contained barium ferrite exhibited magnetic behavior which is similar to soft magnetic materials. Finally the samples were soaked in simulated body fluid (SBF) for 14 days. The apatite was found to form on the surface layer of glass-ceramics and it increases with the barium ferrite content was increased.
การเตรียมและศึกษาสมบัติทางโครงสร้างและแม่เหล็กของอนุภาคคอมโพสิตระดับนาโนเมตรของไฮดรอกซีอะพาไทต์และซิงก์เฟอไรท์ เพื่อประยุกต์ใช้ในการรักษามะเร็งในอนาคต
A promising composite of zinc ferrite (ZnFe2O4) and bioactive hydroxyapatite (Ca10(PO4)6(OH)2 ;HAp) has expected to potential for future bone reinforcing formation. In present study zinc ferrite and hydroxyapatite composite was prepared by solid state reaction route for easier control of structural and magnetic characteristics and with low cost. Hydroxyapatite powder was synthesized by precipitation method from chicken eggshell. Mixed powders with varying ZnFe2O4/HAp weight ratios from 2-10 wt% were milled together and uniaxially pressed and then sintered at 1200 oC for 3 hours. The XRD results showing no other phases of composite with only HAp and ZnFe2O4 phases were identified indicating high stability of HAp property. Phase fractions of ZnFe2O4 were found to increase from 10.8 to 18.73 wt% with increasing content of ZnFe2O4. FT-IR results of ZnFe2O4/HAp composite were only revealed vibration bands of standard HAp phase. This may due to the overlapping of the ZnFe2O4 vibrational bands with HAp bands. However their intense variations observed in HAp vibrational bands indicated the interaction between ZnFe2O4 and HAp. The surface morphology of these ZnFe2O4/HAp composite exhibited primary grain in nano scale with enhanced pore structure and Interconnectivity when ZnFe2O4 weight ratios increased; indicating high surface area for cell attachment and better good cell growth and differentiation. The higher saturation magnetization as well as higher super paramagnetic behavior could be easily altered by increasing ZnFe2O4 content in the composite.
กลยุทธ์การประชาสัมพันธ์ที่มีความสัมพันธ์ต่อการรับรู้ภาพลักษณ์ของมหาวิทยาลัยราชภัฏสวนสุนันทาของประชาชนในกรุงเทพมหานคร
The purposes of the research were 1) to study the demographic are relationship to image of Suan Sunandha Rajabhat University (SSRU) 2) to study the perceptions of public relations is related to corporate image of SSRU 3) to study the relationship of perceived public relations strategies with the SSRU’s image in all dimensions. This quantitative research collected 400 samples of people in Bangkok chosen through multi-level sampling. Data were collected using a. questionnaire and analyzed using percentage mean standard deviation and MANCOVA The results showed that: 1) Most respondents were female aging between 15 and 26 years old holding senior high school being student having average monthly income unless 5000 Baht and not relationship with SSRU staff 2) Gender differences do not result in the recognition of different image to a statistically significant degree (p< .05) while age education salary and relationship with SSRU staff result in the recognition of different image. 3) The samples are perceived image of the SSRU in total is moderate (xˉ = 3.30). Media above the line in category social media has the most image recognition while media below the line in category personal media has the most image recognition. 4) The relations of media above the line and media below the line were a positive correlation to a statistically significant degree (p< .05).
การสื่อสารการตลาดเพื่อส่งเสริมการเข้าร่วมกิจกรรมปั่นเพื่อพ่อของประชาชนในกรุงเทพมหานคร
The Purposes of this research were to study demographic characteristics and marketing communications toward Bike for Dad participation in Bangkok on December 11 2015 of 99999 people registered to join this cycling event in 11 area throughout Bangkok. This is a qualitative research so that questionnaire is applied to 400 people in 6 event area in Bangkok. The research revealed that most of the respondents were female whose age was 36-59 years old and marital status was single. They were employees of private companies that had income THB 10000 – 20000. In marketing communications the research found the public relations and event promotion appeared to have a positive impact on the participation of Bike for Dad in Bangkok. Finding also indicates that there are 5 significant results of people to participate in the event : constancy congruity cooperation constitution and cycling. In term of practical contributions this study provides a useful marketing communication idea for Bike for Dad in Bangkok called “5C’s Information”. In the light of the results state agency can utilize these findings for strategic planning of marketing communication in Bike for Dad or other relevant activities in the future.