Compo­sition, structure and properties of electroless deposited nickel – phosphorus – copper coatings

The nickel – phosphorus – copper functional coating was deposited on aluminum alloys substrate by chemical deposition method from malonate­glycinate nickel plating solution. The chemical and phase coatings composition was studied by X­ray fluorescence and X­ray phase analyze. Thermally stimulated phase transitions in deposited Ni – P – Cu coating were detected by differential scanning calorimetry method. The annealing at 250 and 400 °С was shown to lead to the changes in coating structure involving the transition from amorphous to amorphous­crystalline at 250 °С and to crystalline at 400 °С with Ni and Ni3P1 – δ phases forming. Changes in the structure of Ni–P coating results in the increase of microhardness by 1.6–1.7 times and wear resistance by 3– 4 times. Annealing at 400 °С led to decreasing of corrosion stability of the coatings in 3.5 % sodium chloride solution. The optimum physical, mechanical and protective properties has the attained in the case of Ni – P – Cu coating annealed at 250 °C.

PENERAPAN MODEL PEMBELAJARAN BERBASIS MASALAH PADA MATERI POLA BILANGAN DI KELAS VII SEKOLAH MENENGAH PERTAMA

AbstrakArtikel ini menyajikan bagaimana model Pembelajaran Berbasih Masalah diterapkan pada materi pola bilangan di kelas VII Sekolah Menengah Pertama. Pembelajaran Berbasis Masalah (Problem Based Learning) adalah suatu pendekatan pembelajaran yang menggunakan masalah dunia nyata sebagai suatu konteks bagi siswa untuk belajar tentang cara berfikir kritis dan keterampilan pemecahan masalah, serta untuk memperoleh pengetahuan dan konsep yang esensial dari materi pelajaran. Pembelajaran berbasis masalah digunakan untuk merangsang berfikir tingkat tinggi dalam situasi berorientasi masalah, termasuk didalamnya belajar bagaimana belajar. Adapun langkah-langkah dari model pembelajaran tersebut memiliki 5 tahapan yaitu 1) Tahap orientasi peserta didik pada masalah, 2) Tahap mengorganisasi peserta didik dalam belajar. 3) Tahap membimbing penyelidikan secara individu maupun kelompok. 4) Tahap mengembangkan dan menyajikan hasil karya. 5) Tahap menganalisa dan mengevaluasi proses pemecahan masalah. Selanjutnya bagaimana aktifitas guru dan siswa dalam model Pembelajaran Berbasis Masalah (Problem Based Learning) dalam materi pola bilangan akan dibahas dalam artikel ini. AbstractThis article presents how the Problem-Based Learning model is applied to the numerical pattern material in Grade VII of Junior High School. Problem Based Learning is a learning approach that uses real-world problems as a context for students to learn about critical thinking and problem-solving skills, and to acquire essential knowledge and concepts from subject matter. Problem-based learning is used to stimulate high-level thinking in problem-oriented situations, including learning how to learn. The steps of the learning model have 5 stages namely 1) Stage orientation learners on the problem, 2) Stage of organizing learners in learning. 3) Stage guiding individual and group investigations. 4) Stage of developing and presenting the work. 5) Phase analyze and evaluate problem solving process. Furthermore, how the activities of teachers and students in the model of Problem Based Learning (Problem Based Learning) in the matter of number patterns will be discussed in this article.

PERAN PENGAWAS KEPATUHAN DI BANK SYARIAH MANDIRI

This research try to capture a case that showing the ”Pengawas Kepatuhan” (PKP) character in commercial debt on Bank Syariah Mandiri (BSM) and also showing the conventional characteristics. This research is a kind of qualitative research that using case study method. This is also trying to capture the compliance division duties and all kind of action in commercial debt in BSM. The summery try to showing some of PKP’s characteristics when they guide in compliance function. Some of characteristics define in some phaseas: dealing phase, analyze phase, and debt withdrawal phase. The summery have captured some characteristics as general character on regulation, ex-ante agent character, auditor character and reporter character. In this characteristics, the conventional actions showing on some facts about the apathy attitude, the entertain action and also fraud action which direct some attitude on disobey actions in BSM. Disobey actions become a challenge in real characteristic of PKP which is the preventive ideology should be strive between the regulation idealism and also the sharia principal.

The Research of Fluid in the Cross Micro-Channel

The phenomenon of laminar flow in the micro-channel is demonstrated by the software simulation. It shows different velocity produces different flow layer. Water-in-oil droplets are obtained by the experiments. These experiments take water as the dispersed phase and take the oil as the continuous phase. Analyze forming process and forming factors of the droplets and the column flow. The main factors of forming droplets are surface tension, viscosity shear force and the liquid velocity. The size of droplet is associated with the flow and channel width of two liquids. Changing the pressure of the inlet can obtain droplets in different size.