Hasil Pencarian  ::  Simpan CSV :: Kembali

"Indonesian Journal of Dentistry 2006; Edisi Khusus KPPIKG XIV: 51-56An important phase in endodontic treatment is the irrigation of the root canal system. Desirable function of irrigation are antimicrobial activity, dissolution of necrotic tissue and nontoxicity to the periradicular tissue. Toxicity of NaOCl solution on vital tissue is still controversial. Severe compilations may occur if this solution is inadvertently exposed to the oral mucosa, and it is very hazardous. The purpose of this paper is to caution dentists on the hazards of using NaOCl irrigation in endodontic treatment. A case is presented in which 2.5% NaOCL solution was accidentally streaming into patient's throat because the irrigating needle was not securely attached to the syringe, with the result that the patient had difficulty in breathing. The patient was promptly taken to a pulmonologist, internist, and ENT. The patient was given dexamethasone 10 mg iv injection, delladryl 1cc iv, and nebulizer with 1 ampoule of steroid, 1 ampoule of ventolin and 5cc NaCl 3x within 24 hours, and after 24 hours the condition was increased. From this case it is concluded that the 2.5% NaOCl solution is very alkaline and irritating resulting in edema of the larynx and plugging up of the respiratory system. Clinicians need to be cautious in using NaOCl solution to avoid_endangering the patient's life."

"Penggunaan paduan aluminium silikon sering kali digunakan pada bidang industri, terutama industri otomotif. Paduan aluminium silikon memiliki ketahanan aus dan korosi yang baik. Namun, perlunya untuk meningkatkan lagi sifat ketahanan korosi pada paduan tersebut. Penelitian ini menguji pada paduan aluminium silikon dalam kondisi melalui proses perlakuan panas dan tidak mengalami proses perlakuan panas. Perlakuan panas yang dilakukan Al-Si solution heat treatment dengan suhu 510°C dan artificial aging pada suhu 171°C. Pengujian yang dilakukan yaitu Fluoresensi sinar-X, Difraksi sinar-X, Uji Elektrokimia metode Linear Sweep Voltammetry (LSV) dan Cyclic Voltammetry (CV). Dengan dilakukannya perlakuan panas tanpa artificial aging mengakibatkan memiliki nilai laju korosi tertinggi dengan nilai 0,176 mm/tahun pada larutan 3,5 wt% NaCl dan 0,258 mm/tahun pada larutan 10.5 wt% NaCl. Dilakukannya proses artificial aging memiliki nilai laju korosi yang rendah dengan nilai 0,074 mm/tahun pada larutan 3,5 wt% NaCl selama 10 jam dan 0,154 mm/year pada larutan 10.5 wt% NaCl selama 5 jam. Hasilnya menunjukkan perlakuan panas dengan proses artificial aging berdampak pada bergesernya sudut peak dan meningkatkan ketahanan korosi yang baik.

---

The use of silicon aluminum alloys is often used in industrial fields, especially the automotive industry. Silicon aluminum alloys have good wear and corrosion resistance. However, it is necessary to increase the corrosion resistance properties of the alloy again. This study tested aluminum-silicon alloys under conditions of heat treatment and did not undergo heat treatment. The heat treatment carried out by Al-Si solution heat treatment with a temperature of 510°C and artificial aging at a temperature of 171°C. Tests carried out are X-ray Floresecence, X-ray Diffraction, Electrochemical Test Linear Sweep Voltammetry (LSV) and Cyclic Voltammetry (CV) methods. With heat treatment applied without artificial aging, it has the highest corrosion rate with a value of 0,176 mm/year in a solution of 3,5 wt% NaCl and 0,258 mm/year in a solution of 10,5wt% NaCl. The artificial aging process has a low corrosion rate with a value of 0,074 mm/year in a solution of 3,5 wt% NaCl on sample with 10 hours of aging and 0,154 mm/year in a solution of 10,5 wt% NaCl on sample with 5 hours of aging. The results show that heat treatment has an impact on shifting the peak angle and increases good corrosion resistance."

"Penelitian ini mengkaji pengaruh penambahan natrium sulfat dan sulfur terhadap reduksi karbotermik selektif pada ilmenit dan bimomassa. Telah direduksi sebanyak tiga belas sampel dengan variasi persentase penambahan aditif dengan kenaikan 1,5%, jenis ilmenit dan lama waktu milling. Reduktor yang digunakan yaitu bimoassa dari pulverized cangkang kelapa sawit, sedangkan CMC sebagai binder. Sampel direduksi pada temperatur 120oC pada kondisi inert selama 60 menit. Berdasarkan karakterisasi XRD, diperoleh fasa dominan yaitu besi dan ferros-pseudobrookite.  Hasil uji SEM memperlihatkan agregasi dan pertumbuhan partikel besi lebih baik dengan penambahan natrium sulfat daripada sulfur, dan waktu proses mechanochemical yang lama. Berdasarkan analisa Image-J diperoleh nilai tertinggi untuk luas rata-rata yaitu 73,78 mm2 pada penambahan natrium sulfat. Sedangkan nilai tertinggi dengan penambahan sulfur yaitu 36,57 mm2. Selain itu, nilai recovery dan kadar pada Fe dan Ti dibedakan pada fasa metalik dan fasa terak. Untuk nilai recovery dan kadar Ti bukan dalam bentuk logam akan tetapi dalam fasa bentuk fasa TiO2, FeTiO3, FeTi2O5, dan MgTi2O5. Pada fasa metalik, nilai tertinggi recovery (%) Fe dan Ti berturut-turut yaitu 92,82 dan 22,46. Sedangkan untuk nilai kadar (%) Fe dan Ti berturut-turut yaitu 94,20 dan 18,91. Disisi lain, pada fasa terak, nilai tertinggi recovery (%) Fe dan Ti berturut-turut yaitu 42,00 dan 98,51. Sedangkan untuk nilai kadar (%) Fe dan Ti berturut-turut yaitu 17,33 dan 70,45.

---

This study examined the effect of adding sodium sulfate and sulfur to selective carbothermic reduction on ilmenite and biomass. Thirteen samples have been reduced by adding additive doses with an increase of 1.5%, ilmenite type and length of milling time. The reductors used are biomass from pulverized palm oil shell, while CMC is a binder. Samples were reduced at a temperature of 1200oC in an inert condition for 60 minutes. Based on XRD characterization, the dominant phase is iron and ferros-pseudobrookite. The SEM test results show that the aggregation and growth of iron particles is better with the addition of sodium sulfate than sulfur, and the long process time of the mechanochemical process. Based on Image-J analysis, the highest value for the average area was 73.78 mm2 for the addition of sodium sulfate. While the highest value with the addition of sulfur is 36.57 mm2. In addition, the recovery and grade in Fe and Ti are distinguished from the metallic phase and the slag phase. For recovery and grade of Ti not in metal form but in phase form phase TiO2, FeTiO3, FeTi2O5, and MgTi2O5. In the metallic phase, the highest recovery (%) in Fe and Ti were 92.82 and 22.46, respectively. Whereas for the grade (%) in Fe and Ti 94.20 and 18.91, respectively. On the other hand, in the slag phase, the best recovery (%) in Fe and Ti were 42.00 and 98.51, respectively. Whereas for the grade of (%) Fe and Ti 17.33 and 70.45, respectively."

"

Berdasarkan data kualitas air IPA 3 Gading Serpong, mangan pada air baku melebihi standar 0,1 mg/L dan kadar sisa klor air produksi masih di bawah standar 0,2-1 mg/L. Untuk menentukan dosis optimum NaOCl dalam menurunkan mangan air baku dan meningkatkan sisa klor air produksi serta menganalisis perbandingan proses pengolahan air dengan oksidasi dan tanpa oksidasi, dilakukan penelitian dengan simulasi proses pengolahan air pada skala laboratorium. Percobaan tahap pertama bertujuan menentukan dosis optimum NaOCl dalam menurunkan kandungan mangan dengan variasi dosis NaOCl 4, 6, 8, dan 10 ppm. Percobaan tahap kedua bertujuan membandingkan proses pengolahan air dengan dan tanpa oksidasi. Percobaan tahap ketiga dilakukan untuk melihat hubungan oksidasi terhadap post-klorinasi. Parameter yang digunakan dalam penelitian adalah mangan, kekeruhan, pH, dan sisa klor. Hasil penelitian menunjukkan dosis optimum untuk oksidasi mangan adalah 8 ppm dengan penurunan mangan sebesar 29%. Hasil kualitas air terbaik dimiliki oleh sampel yang disertai proses oksidasi 8 ppm dengan penambahan klor 60 ppm pada proses post-klorinasi yang memiliki kekeruhan 0,97 NTU, pH 7,7, dan sisa klor 0,26 mg/L. Proses oksidasi dan post-klorinasi tersebut dapat diimplementasikan pada IPA 3 Gading Serpong dengan mudah tanpa penambahan sumber daya yang signifikan.

---

WTP 3 Gading Serpong water quality data shows that raw water manganese surpasses 0,1 mg/L and treated water residual chlorine remains below 0,2-1 mg/L. A laboratory-scale simulation was used to identify the optimal dose of NaOCl to reduce raw water manganese and increase treated water residual chlorine, as well as to compare the water treatment process with and without oxidation. The first phase of the trial tested NaOCl doses of 4, 6, 8, and 10 ppm to reduce manganese levels. The second phase trial compares water treatment processes that include and exclude oxidation. In the third phase, the relationship between oxidation and postchlorination was investigated. Manganese, turbidity, pH, and residual chlorine are the study's parameters. The study found that an optimal dose of 8 ppm for manganese oxidation resulted in a 29% reduction in manganese. The best results for water quality are obtained with samples that have an oxidation process of 8 ppm and an addition of 60 ppm chlorine in the post-chlorination process with a turbidity of 0.97 NTU, a pH of 7.7, and a residual chlorine of 0.26 mg/L. The oxidation and post-chlorination processes can be implemented at WTP 3 Gading Serpong easily without adding significant resources.

"