State University of Semarang

About: State University of Semarang is a education organization based out in Semarang, Indonesia. It is known for research contribution in the topics: Population & Curriculum. The organization has 7737 authors who have published 7790 publications receiving 38055 citations. The organization is also known as: Universitas Negeri Semarang.

Pengaruh Keputusan Investasi, Pendanaan dan Dividen terhadap Nilai Perusahaan dengan Risiko sebagai Variabel Mediasi

Abstract: The aim of this research is to know the influence of investment desicion, funding and dividend to the firm value with the risk as a mediation variable. Population that is used in this research is a company manufacturing sector which is listed on Indonesia Stock Exchange in the period from 2011 until 2013. Number of sample that used in this research is 60 samples with the method purposive sampling. Firm value variable is proxied by Price Book Value Ratio (PBR), Investment decision is proxied by Price Earning Ratio (PER), financing decision subtitued by Debt to Equity Ratio (DER), dividend policy is proxied by Dividend Pay Out Ratio (DPR) and business risk subtitued by Degree of Operating Leverage (DOL). Data Analysis using multiple regression analysis and line analysis by using a SPSS 16 program. The research concluded that only the investment decisions and the funding decision which has an effect on the firm value.

Current Ratio, Debt to Equity Ratio, Total Asset Turnover, Return on Asset, Price to Book Value sebagai Faktor Penentu Return Saham

Abstract: The purpose ofthis studyistoexamineandanalyze thefinancial ratio is measuredwithCurrent Ratio, Debt to Equity Ratio, Total Asset Turnover, Return On Asset, Price to Book Value towards share return. The populationin this study areallReal Estate and Property Industri Listed inthe indonesia stock exchange since period 2012-2013, with the total of47companys. Thestudysamplewas takenby purposive sampling method, with the total of 31company. This study usesdata analysisof multiple linear regression analysis to estimated of dependent variable’s value from independent variable’s. Based onthe research results, it can be known that only price to book value has a significant effect toward share return and for current ratio, debt to equity ratio, total asset turnover, return on asset has not a significant effect toward share return.

Biodegradation of Polylactic Acid-Based Bio Composites Reinforced with Chitosan and Essential Oils as Anti-Microbial Material for Food Packaging

Abstract: This study aims to produce and investigate the potential of biodegradable Polylactic Acid (PLA)-based composites mixed with chitosan and Turmeric Essential Oil (TEO) as an anti-microbial biomaterial. PLA has good barrier properties for moisture, so it is suitable for use as a raw material for making packaging and is included in the GRAS (Generally Recognized As Safe). Chitosan is a non-toxic and antibacterial cationic polysaccharide that needs to be improved in its ability to fight microbes. TEO must be added to increase antibacterial properties due to a large number of hydroxyl (-OH) and carbonyl functional groups. The samples were prepared in three different variations: 2 g of chitosan, 0 mL TEO and 0 mL glycerol (Biofilm 1), 3 g of chitosan, 0.3 mL TEO and 0.5 mL of glycerol (Biofilm 2), and 4 g of chitosan, 0.3 of TEO and 0.5 mL of glycerol (Biofilm 3). The final product was characterized by its functional group through Fourier transform infrared (FTIR); the functional groups contained by the addition of TEO are C-H, C=O, O-H, and N-H with the extraction method, and as indicated by the emergence of a wide band at 3503 cm-1, turmeric essential oil interacts with the polymer matrix by creating intermolecular hydrogen bonds between their terminal hydroxyl group and the carbonyl groups of the ester moieties of both PLA and Chitosan. Thermogravimetric analysis (TGA) of PLA as biofilms, the maximum temperature of a biofilm was observed at 315.74 °C in the variation of 4 g chitosan, 0.3 mL TEO, and 0.5 mL glycerol (Biofilm 3). Morphological conditions analyzed under scanning electron microscopy (SEM) showed that the addition of TEO inside the chitosan interlayer bound chitosan molecules to produce solid particles. Chitosan and TEO showed increased anti-bacterial activity in the anti-microbial test. Furthermore, after 12 days of exposure to open areas, the biofilms generated were able to resist S. aureus and E. coli bacteria.

Effects of Probiotics on Anxiety, Stress, Mood and Fitness of Badminton Players

Abstract: Background: Reports of probiotic consumption on athletes’ performance are debatable due to their equivocal results. There is a need for more evidence on the effects of probiotic intake on psychological state and fitness level. Thus, this study determined the effects of daily probiotic consumption on competitive anxiety, perceived stress and mood among university badminton players, besides their fitness like aerobic capacity, strength, speed, leg power and agility. Methods: Thirty university badminton players aged from 19 to 22 years old were randomly divided equally into two groups, where the probiotic group (PG; n = 15) received a drink that contained Lactobacillus casei Shirota (3 × 1010 CFU) and placebo group (CG; n = 15) a placebo drink for six weeks. Anxiety, stress and mood levels were determined using the CSAI-2R, PSS and BRUMS questionnaires, respectively. Fitness levels were measured using by subjecting the players to 20-m shuttle runs (aerobic capacity), handgrips (muscular strength), vertical jumps (leg power), 40-m dash (speed) and T-test (agility). The Student’s t-test (p < 0.05) was used to determine the differences between PG and CG players. Results: After six weeks, the anxiety and stress levels of PG players significantly decreased by 16% (p < 0.001) and 20% (p < 0.001), respectively, but there were no significant changes detected in CG players. Supplementation of probiotics also improved aerobic capacity in PG players by 5.9% (p < 0.001) but did not influence the speed, strength, leg power and agility. Conclusions: Probiotics supplementation showed improved aerobic capacity and relieve anxiety and stress. However, further studies need to be carried out to determine the mechanisms through which probiotic intake produces these effects.

Analisis kemampuan pemecahan masalah ditinjau dari karakteristik cara berpikir siswa dlaam model problem based learning

Abstract: Salah satu tujuan pembelajaran matematika adalah agar siswa memiliki kemampuan memecahkan masalah yang meliputi kemampuan memahami masalah, merancang model matematika, menyelesaikan model dan menafsirkan solusi yang diperoleh. Di satu sisi pemecahan masalah matematika penting, namun di sisi lain siswa sering mengalami kesulitan dalam pemecahan masalah matematika. Rendahnya kemampuan pemecahan masalah siswa di Indonesia dibuktikan oleh hasil tes yang dilakukan oleh dua studi internasional, Programme for International Student Assesment (PISA) pada tahun 2012 dan Trends in International Mathematics and Science Study (TIMSS) pada tahun 2011. Penelitian ini bertujuan untuk memperoleh deskripsi kemampuan pemecahan masalah siswa SMP Kelas VIII ditinjau dari karakteristik cara berpikir siswa tipe Sekuensial Konkret (SK), Sekuensial Abstrak (SA), Acak Konkret (AK), dan Acak Abstrak (AA) dalam model Problem Based Learning. Penelitian ini menggunakan pendekatan kualitatif dengan jenis penelitian studi kasus. Subjek penelitian ini adalah 8 siswa kelas VIII SMP Negeri 9 Semarang, yang dipilih dari masing-masing tipe 2 subjek penelitian secara purposive sample. Subjek dipilih dengan mempertimbangkan penjelasan guru mengenai kemampuan siswa mengemukakan pendapat atau jalan pikiran secara lisan. Penentuan subjek penelitian didasarkan pada hasil angket karakteristik cara berpikir siswa dan hasil tes kemampuan pemecahan masalah siswa. Instrumen angket yang digunakan dalam penelitian ini diadopsi dari suatu angket tentang karakteristik cara berpikir yang dibuat oleh John Park Le Tellier dalam DePotter & Hernacki. Metode pengumpulan data dalam penelitian ini adalah angket karakteristik cara berpikir, tes kemampuan pemecahan masalah, dan wawancara. Analisis data pada penelitian ini dilakukan dengan tahap-tahap yang meliputi reduksi data, penyajian data, dan menarik kesimpulan dan verifikasi. Hasil penelitian menunjukkan bahwa meskipun siswa dengan karakteristik cara berpikir tipe SA dalam memahami masalah tidak menuliskan apa yang ditanyakan dari soal dan menuliskan langkah-langkah pemecahan masalah secara kurang lengkap, kemampuan pemecahan masalah siswa dengan karakteritik cara berpikir tipe SA lebih tinggi daripada siswa dengan karakteristik cara berpikir tipe SK, AK, dan AA.