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Abstrak :
Advertising clutter di media sosial dapat memicu respons negatif dan mengurangi efektivitas iklan digital. Namun, nostalgia yang ditimbulkan oleh iklan di media sosial diketahui dapat membangkitkan tanggapan positif konsumen terhadap brand yang diiklankan. Nostalgia pada iklan digital telah banyak digunakan oleh brand di seluruh dunia dan telah diteliti sebelumnya. Meskipun demikian, masih belum jelas bagaimana nostalgia dapat membangkitkan tanggapan positif pada tipe media sosial yang berbeda. Penelitian ini menggunakan teori nostalgia dan consumer-brand relationship untuk menguji efek moderasi tipe media sosial pada hubungan antecedent (need to belong, nostalgia proneness, dan social media intensity) dan outcomes (self-brand connection & social media engagement) dari iklan nostalgia di Facebook dan Instagram. Data dikumpulkan dari pengguna Facebook & Instagram melalui survei online dan dianalisis menggunakan structural equation modeling dengan multiple-group analysis. Hasilnya menunjukan bahwa ada efek yang signifikan pada pengaruh need to belong terhadap nostalgia proneness, social media intensity terhadap ad-evoked nostalgia, ad-evoked nostalgia terhadap self-brand connection, serta self-brand connection terhadap social media engagement pada Instagram dan Facebook. Sedangkan efek moderasi tipe media sosial signifikan pada pengaruh need to belong terhadap ad-evoked nostalgia, need to belong terhadap nostalgia proneness, nostalgia proneness terhadap ad-evoked nostalgia, serta nostalgia proneness terhadap social media intensity. ......Advertising clutter on social media can trigger negative responses and reduce the effectiveness of digital advertising. However, nostalgia evoked by advertising on social media is known to evoke positive consumer responses to the advertised brand. Nostalgia appeal on digital advertisements has been widely used by brands around the world and has been studied before. Nonetheless, it remains unclear how nostalgia can evoke positive responses on the different social media types. The current research used the theory of nostalgia and consumer-brand relationship to examine the moderating effect of social media types on the antecedent (need to belong, nostalgia proneness, and social media intensity) and outcomes (self-brand connection & social media engagement) of ad-evoked nostalgia on Facebook & Instagram. The data were collected from Facebook & Instagram millennial users through online surveys and analyzed using structural equation modeling with multiple-group analysis. The results show that there is a significant effect of need to belong to nostalgia proneness, social media intensity to ad-evoked nostalgia, ad-evoked nostalgia to self-brand connection, and self-brand connection to social media engagement on Instagram and Facebook. Meanwhile, the moderating effect of social media type is significant on the effect of need to belong to ad-evoked nostalgia, need to belong to nostalgia proneness, nostalgia proneness to ad-evoked nostalgia, and nostalgia proneness to social media intensity.

Abstrak :
Blok hidroksiapatit yang dibuat melalui metode sintering sulit teresorpsi di dalam tubuh karena memiliki kristalinitas yang tinggi. Blok hidroksiapatit dengan kristalinitas rendah dapat dibuat melalui reaksi disolusi presipitasi. Kalsium sulfat dihidrat memenuhi persyaratan sebagai prekursor reaksi disolusi presipitasi, yaitu biokompatibel dan secara termodinamik lebih stabil dibandingkan dengan hidroksiapatit. Penelitian ini bertujuan menghasilkan blok hidroksiapatit menggunakan prekursor blok CaSO4.2H2O dengan metode disolusi presipitasi. Spesimen dibuat dengan mencampurkan bubuk CaSO4.1/2H2O dan akuades dengan rasio akuades banding bubuk 0,5. Blok CaSO4.2H2O direndam di dalam larutan Na3PO4 0,5 mol/L dan dipanaskan pada suhu 80˚C selama 24 jam, 48 jam, dan 72 jam. Karakterisasi blok hidroksiapatit dilakukan dengan uji X-ray Diffraction (XRD), kemudian data yang didapatkan dianalisis menggunakan Rietveld Refinement (High Score Plus, PANalytical). Uji kekuatan tarik diametral (DTS) dilakukan untuk mengevaluasi kekuatan mekanik spesimen. Tidak terdapat fasa hidroksiapatit yang teridentifikasi pada seluruh kelompok spesimen. Fasa yang teridentifikasi pada kelompok yang direndam selama 24 jam adalah CaSO4.2H2O, CaSO4, dan Ca(OH)2. Sedangkan pada kelompok yang direndam selama 48 jam dan 72 jam, fasa yang teridentifikasi adalah CaSO4 dan Ca(OH)2. Berdasarkan uji statistik One-Way ANOVA dan Post-Hoc Tamhane (IBM SPSS 2.0), terdapat penurunan nilai DTS yang signifikan pada kelompok sebelum dan sesudah perendaman selama 24 jam, 48 jam, dan 72 jam. Penurunan nilai DTS juga signifikan antara kelompok yang direndam selama 24 jam dengan kelompok yang direndam selama 48 jam dan 72 jam. Namun, tidak terdapat perbedaan bermakna antara nilai DTS kelompok 48 jam dan 72 jam. Disimpulkan bahwa hidroksiapatit tidak terdeteksi pada kelompok spesimen CaSO4.2H2O yang direndam dalam larutan Na3PO4 0,5 mol/L selama 24 jam, 48 jam, dan 72 jam. ......Sintered hydroxyapatite cannot be resorbed in the body due to its high crystallinity. Low crystalline hydroxyapatite can be fabricated through dissolution-precipitation reaction. Calcium sulfate dihydrate meets the requirements to be used as a precursor for dissolution-precipitation reaction, that is biocompatible and thermodynamically more stable than hydroxyapatite. The aim of this study was to produce hydroxyapatite block using CaSO4.2H2O based on dissolution precipitation method. Specimens were made from CaSO4.1/2H2O powder mixed with distilled water at a water-to-powder ratio of 0,5. The CaSO4.2H2O blocks were immersed in Na3PO4 0,5 mol/L solution at 80˚C for 24, 48, and 72 hours each. For characterization of the specimens, X-ray Diffraction (XRD) analysis was used and data obtained from the test was analyzed with Rietveld Refinement (High Score Plus, PANalytical). Diametral tensile strength (DTS) was used for mechanical strength evaluation. There was no hydroxyapatite phase identified in all groups of specimens. The phases identified in group with 24 hours immersion time were CaSO4.2H2O, CaSO4, and Ca(OH)2. Whereas in group with 48 and 72 hours immersion time, the phases identified were CaSO4, and Ca(OH)2. Based on statistical analysis using One Way Anova and Post-Hoc Tamhane tests (IBM SPSS 2.0), there was a significant decrease in DTS value between group of specimens before and after immersion for 24, 48, and 72 hours. The decrease in DTS value was also significant between group of specimens with 24 hours immersion time and groups of specimens with 48 hours and 72 hours immersion time. But, the difference between group of specimens with 48 hours and 72 hours immersion time was not significant. It was concluded that there was no hydroxyapatite phase identified in groups of specimens immersed in Na3PO4 0,5 mol/L solution at 80˚C for 24, 48, and 72 hours.