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Metoda Estimasi Komperatif Untuk Analisa Beban Pendingin Sistim Pengkondisian Udara Zamri, Aidil; Zulhendri, Zulhendri
JURNAL R & B Vol 3, No 2 (2003)
Publisher : JURNAL R & B

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Abstract

Air conditioning process is a technique that can be used to adjust preferable condition of air temperature in a room so an appropriate condition can be achieved. Cooling pocess is a room can be identified as a transferring process of heat from that room into other places. This absorbing or transferring process is not as casy as the process of interesting the heat into the room. In absorbing process of the heat, it is necessary to use certain equipment and careful activities, particularly in choosing the right devices and planning activities choosing cooling procedures. Those device must be really determinated by several factors such as the quantity of the absorbed heat, duration and capacity of utilized devices.
Analisa Kegagalan Sambungan Las Pada Pipa Aunstenit Stainless Steel Adril, Elvis; Badaruddin, M; Zulhendri, Zulhendri
JURNAL R & B Vol 2, No 1 (2002)
Publisher : JURNAL R & B

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Abstract

Austenit stainless steel pipe which is connected through welding process is easily broken. It is manly due to the crack which is located in HAZ (head effected zone). The changing in micro structure creates that crack sin re there are a lot of martensit pieces. This layer includes cause of residual stress that can cause micro crack. Another cause of this crack is corrosion. This SCC is caused by the residual sterss on the material and it occurs in corrosion environment. These to causes will lead failure in construction. This failure will occur if the value of resistance intensity factor ( k1 > k 1c) or the legth of allowed crack.
Studi Komperatif Akurasi Pemakaian Persaman Bentangan Plat Metode Bidang Netral, Konstanta X’ Dan Metode Faktor Koreksi Y’ Untuk Proses Penekukan Pipa Zulhendri, Zulhendri; Asmed, Asmed
POLI REKAYASA Vol 1, No 2 (2006)
Publisher : POLI REKAYASA

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Abstract

Principle of bend is the existence of shares which stretch at bend exterior and shares which dwindling at bend interior. Pursuant to principle of writer interest to see level accuracy of equation unfold plate if used for the process of pipe bend. Pursuant to literature, there is three formulas or way for bend unfold plate. From third the equation seen which is which most accurate if used for pipe with a few diameter variations and of radius bend. From research got; for pipe with diameter 2,54 and cm of Rb 5,99 cm mount most accurate or lowest mistake is first way that is with method of calculation with neutral area ( normal). With level mistake of mean e = +, 84% For pipe with diameter 3,375 and cm of Rb 7,73 cm mount most accurate or lowest mistake is first way that is with method of calculation with neutral area ( normal). With level mistake of mean e = 0,05 %. For pipe with diameter 4,275 cm, Rb 10,225 cm mount most accurate or lowest mistake is second way that is with method reduction of X constantan with level mistake of mean e = - 0,46%.
Kaji Eksperimental Penyimpan Panas Sementara dari Hasil Udara Panas Keluaran Kolektor Energi Surya Rosa, Yazmendra; Menhendry, Menhendry; Zulhendri, Zulhendri
POLI REKAYASA Vol 4, No 1 (2008)
Publisher : POLI REKAYASA

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Abstract

Temporary heat storage from heat air solar collector source has been studied in this experiment. Paraffin, as phase change material (PCM) is used as a working object in storage system. The heat air transfer is enhanced from the heat exchanger, a numbers of fin aluminum plates, which caused increasing of heat transfer. These varieties mass flow rates and some exchangers solar energy such as heater electric and solar energy, were examined by using power supply fan DC (3V, 6V, 7,5V, 9V), and heater (350W, 700W, 900W, 1600W). Storage system and channel are isolated by glass wool, so heat transfer to surroundings could be minimizes. Storage capacity PCM is by melting time is 4 hours and 28,2 minutes in temperature melting. Experimental data acquisition research shows that it’s have the same average temperature distribution. The PCM can be function about 5oC on source heater energy and about 1oC from experimental solar collector.  The average efficiency from solar collector storage system is about 16,39% and Coefisien of Performance is 1,13. So based on ths experiment,  storage PCM solar colector system can be used as heat storage by increased source heat air and restore on it, and can be used again  after heat air source decreased.
Inovasi Ayunan Bayi Sistem Otomatis Dengan Prinsip Jam Bandul Zulhendri, Zulhendri
POLI REKAYASA Vol 7, No 1 (2011)
Publisher : POLI REKAYASA

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Abstract

Swinged the baby is one way movement for all bodies and must be done smoothly because if not would generate  situation of so-called with term ´ shaken baby syndrome´ which because of way candle or sway the too hard or too boisterous at baby. Sway the baby too boisterous will make the baby head terguncang forwards and rear. In this time there are some the baby cradle types for example; baby cradle with long string. To sway the baby with this type of have to be started with boisterous oscillation so that oscillation take place the llama, this matter rentan the happening of guncangan [at] brain and generate damage of brain. Oscillation with short string. Cradle this type of have to be swayed continuously so that the mother or nursemaid have to fixed reside in the place and cannot do the other work. Pursuant to the mentioned is innovate the healthy cradle for baby and can sway by self with speed and deviation remain to without needed to sway by using pendulum oscillation principle at with title Inovasi Ayunan Bayi Sistem Otomatis Dengan Prinsip Jam Bandul. Pursuant to designing to wake up the baby oscillation with pendulum system and result analyse and evaluate from the appliance test-drive inferential that is 1.Prinsip applicable pendulum [hour/clock] to make the oscillation can sway by self. 2.Energi to do the the oscillation is got from potential energy from pemberat which altered become energi oscillation motion through mechanism anchor and gear be like pendulum. Oscillation with this pendulum  system still has weakness and need some completions to be able to work better.
Rancang Bangun Konstruksi Rangka Dan Bak Penampung Alat Penyapu Jalan Ziyad, Muhammad; Zamri, Aidil; Zulhendri, Zulhendri
Jurnal Teknik Mesin Vol 11 No 1 (2018): Jurnal Teknik Mesin
Publisher : P3M Politeknik Negeri Padang

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Abstract

At this time in the process of sweeping the road still using traditional tools by janitors, for example broom sticks. One of the technologies that began to develop was the Street Sweeper machine. This Street Sweeper is a tool to help alleviate the work of janitors in terms of road sweeping. Sweeping the highway using the Street Sweeper is one of the main steps to accelerate the process of sweeping the highway with rapid traffic flow. The working principle of this machine is by utilizing thrust from humans, by means of a machine being pushed and directed to the garbage scattered on the road. Therefore it is very appropriate to use Street Sweeper to sweep the road compared to using manual tools because it can save work time
PELESTARIAN MUSIK TRADISIONAL GANDANG SARUNAI MASYARAKAT ALAM SURAMBI SUNGAI PAGU DI NAGARI SAKO UTARA PASIA TALANG Zulhendri, Zulhendri; Wimbrayardi, Wimbrayardi; Maestro, Esy
SENDRATASIK UNP Vol 2, No 2 (2014): Seri A
Publisher : FBS Universitas Negeri Padang

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Abstract

Abstract   This study was aimed at describing the preservation of traditional music of Gandang Sarunai in Nagari Sako Pasia Talang Alam Sarambi Sungai Pagu. This was a quatitative research which used descriptive analysis approach. The instruments of the research were camera, note-book and list of interview. The data was collected through observation, interview and photography. It then was classified into primary and secondary data. The result of the study indicated thet the preservation of traditional music of Gandang Sarunai in Nagari sako Utara Pasia Talang was done in non-formal way; learning throughy observing or watching the show, and legating the skill hereditarily or through art groups. There were three phases done in acquiring the skills of playing Gandang Sarunai through and so were in art groups. In society, Gandang Sarunai was performed in the ceremony of Pengangkatan Penghulu, wedding party, building Rumah Gadang, and welcoming the noble guests. Gandang Sarunai also had four function which were as emotional expression, entertainment, esthetics, and communication. Keywords : Art, gandang sarunai, penggunaan, pelestarian, fungsi
PENINGKATAN KETERAMPILAN MENULIS PUISI DENGAN MENGGUNAKAN MODEL ACTIVE LEARNING TEKNIK CARD SORT KELAS V SDTI 030 BATU BELAH Delfi, Rosdiana Sri; Pebriana, Putri Hana; Zulhendri, Zulhendri
Jurnal Pendidikan dan Konseling (JPDK) Vol 1, No 1 (2019): Agustus 2019
Publisher : Universitas Pahlawan Tuanku Tambusai

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Abstract

Penelitian ini bertujuan penelitian ini untuk meningkatan keterampilan menulis siswa kelas V SD TI 030 Batu Belah. Metode Penelitian ini adalah Penelitian Tindakan Kelas (PTK). Setiap siklus terdiri dari dua pertemuan dan empat tahapan, yaitu perencanaan, pelaksanaan, observasi, refleksi. Subjek penelitian ini siswa kelas V yang berjumlah 20 orang, dengan jumlah siswa laki-laki 7 orang, dan siswa perempuan berjumlah 13 orang. Teknik pengumpulan data berupa dokumentasi, observasi, dan tes. Hasil penelitian ini menunjukkan bahwa hasil keterampilan menulis siswa pada pelajaran Bahasa Indonesia materi puisi di kelas V SD TI 030 Batu Belah pada siklus I tergolong cukup dengan rata-rata 70,05. Selanjutnya dari 20 orang siswa hanya 12 orang yang tuntas dengan ketuntasan klasikal 60,00%. Pada siklus II tergolong baik dengan rata-rata 81,05 dari 20 orang siswa terdapat 17 orang siswa yang tuntas dengan ketuntasan klasikal 85%. Dengan demikian dapat disimpulkan model Active Learning teknik Card Sort dapat meningkatkan keterampilan menulis siswa pada pelajaran Bahasa Indonesia materi puisi pada siswa kelas V SDN TI 030 Batu Belah.
PENINGKATAN KETERAMPILAN MENULIS PUISI DENGAN MENGGUNAKAN MODEL EXPERIENTIAL LEARNING PADA SISWA KELAS III SEKOLAH DASAR Gustina, Gustina; Pebriana, Putri Hana; Zulhendri, Zulhendri
Jurnal Pendidikan dan Konseling (JPDK) Vol 1, No 1 (2019): Agustus 2019
Publisher : Universitas Pahlawan Tuanku Tambusai

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Abstract

Penelitian ini dilatar belakangi oleh rendahnya hasil keterampilan menulis siswa pada mata pelajaran Bahasa Indonesia pada materi puisi di kelas III SDN TI 030 Batu Belah. Salah satu solusi untuk mengatasi masalah ini adalah dengan menggunakan model pembelajaran Experiential Learning. Tujuan penelitian ini untuk mendeskripsikan peningkatan keterampilan menulis siswa pada mata pelajaran Bahasa Indonesia materi puisi dengan menggunakan Experiential Learning. pada siswa kelas III SDN TI 030 Batu Belah. Metode Penelitian ini adalah Penelitian Tindakan Kelas (PTK) yang dilaksanakan dalam dua siklus. Setiap siklus terdiri dari dua pertemuan dan empat tahapan, yaitu perencanaan, pelaksanaan, observasi, refleksi, dan waktu penelitian dilaksanakan pada bulan Juli 2019. Subjek penelitian ini siswa kelas III yang berjumlah 25 orang, dengan jumlah siswa laki-laki 15 orang, dan siswa perempuan berjumlah 10 orang. Teknik pengumpulan data berupa dokumentasi, observasi, dan tes. Hasil penelitian ini menunjukkan bahwa hasil keterampilan menulis siswa pada mata pelajaran Bahasa Indonesia materi puisi di kelas III SDN TI 030 Batu Belah pada siklus I tergolong cukup dengan rata-rata 60,00. Selanjutnya dari 25 orang siswa hanya 14 orang yang tuntas dengan ketuntasan klasikal 56% dan yang tidak tuntas 11 orang. Pada siklus II tergolong baik dengan rata-rata 78,80 dari 25 orang siswa terdapat 23 orang siswa yang tuntas dengan ketuntasan klasikal 92% dan yang tidak tuntas 2 orang. Indikator penilaian Experiential Learning diksi tema dan amanat. Dengan demikian dapat disimpulkan bahwa dengan menggunakan model pembelajaran Experiential Learning. dapat meningkatkan keterampilan menulis siswa pada mata p
ANALISIS KESULITAN BELAJAR STRUKTUR ALJABAR PADA MAHASISWA SEMESTER III JURUSAN PENDIDIKAN MATEMATIKA STKIP PAHLAWAN TUANKU TAMBUSAI RIAU TAHUN AJARAN 2015/2016 Astuti, Astuti; Zulhendri, Zulhendri
Jurnal Cendekia : Jurnal Pendidikan Matematika Vol 1 No 1 (2017): Jurnal Cendekia: Jurnal Pendidikan Matematika
Publisher : Prodi Pendidikan Matematika

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Abstract

Tujuan dari penelitian ini adalah untuk mengetahui dimana letak kesulitan belajar dan faktor-faktor yang menyebabkan kesulitan belajar struktur aljabar yang dialami oleh mahasiswa agar nilai struktur aljabar lebih baik dan memuaskan sehingga mahasiswa termotivasi untuk mengikuti mata kuliah struktur aljabar. Subjek penelitian yang diambil yaitu mahasiswa semester III tahun pelajaran 2015/2016. Metode pengumpulan data yang digunakan adalah metode dokumentasi, metode tes, metode observasi dan metode wawancara. Metode dokumentasi digunakan untuk memperoleh data tentang daftar nama mahasiswa yang dijadikan susbjek penelitian. Metode tes digunakan untuk memperoleh data penyelesaian mahasiswa pada mata kuliah struktur aljabar.metode observasi diguankan untuk mengetahui kondisi objektif saat kegiatan belajar mengajar struktur aljabar dan untuk mengetahui faktor-faktor yang dapat mempengaruhi proses pembelajaran. Metode wawancara dilakukan untuk mengetahui secara jelas permasalahan yang dihadapi mahasiswa ketika belajaar struktur aljabar. Letak kesulitan mahasiswa dalam belajar struktur aljabar yaitu pada bagian pemecahan masalah, konsep dan keterampilan. Kesulitan yang paling tinggi dialami oleh siswa adalah pada bagian pemecahan masalah dengan persentase 62,5%. Kesulitan lain yang dialami oleh mahasiswa yaitu kesulitan dalam konsep dengan persentase 50%. Kesulitan yang terkahir dialami oleh mahasiswa yaitu kesulitan pada keterampilan dengan persentase 45,7%