Irvan Irvan | Universitas Muhammadiyah Sumatera Utara (original) (raw)

Papers by Irvan Irvan

Abstrak. Tujuan penelitian ini adalah untuk meningkatkan kemampuan berpikir kritis dan hasil bel... more Abstrak. Tujuan penelitian ini adalah untuk meningkatkan kemampuan berpikir kritis dan hasil belajar mahasiswa dalam pembelajaran matakuliah statistik matematika 2 semester V A pagi program studi pendidikan matematika FKIP UMSU dengan menerapkan model pembelajaran Problem Based Learning (PBL). Subjek penelitian dalam penelitian ini adalah mahasiswa kelas V A pagi Program Studi Pendidikan Matematika FKIP UMSU yang berjumlah 42 mahasiswa. Penelitian tindakan kelas ini dilaksanakan dalam 2 siklus. Kegiatan setiap siklus dalam penelitian meliputi kegiatan perencanaan, pelaksanaan, observasi dan refleksi. Pelaksanaan tindakan kelas menggunakan model pembelajaran berbasis masalah. Peneliti menggunakan 2 (dua) instrumen pada setiap siklus, yakni lembar diskusi mahasiswa serta tes tertulis tiap individu pada setiap akhir siklus dan lembar observasi kemampuan berpikir kritis untuk pengumpulan data. Hasil penelitian menunjukkan bahwa penerapan model pembelajaran berbasis masalah dapat mening...

JiTEKH

Housing is a basic human need and needs to be fostered and developed for the survival and enhance... more Housing is a basic human need and needs to be fostered and developed for the survival and enhancement of people's lives and livelihoods and settlements cannot be seen as mere suggestions of needs, but more than that it is a process of settling in creating a living space to socialize themselves and reveal their identity. The development method in building a Security and Cleanliness Contribution Payment Information System in Menteng Indah Housing Based on Website based on the theory of design thinking methods. Design thinking is a method used to solve problems encountered by gathering lots of ideas in brainstorming sessions using a user-centered approach. The research test is to produce a Fee Payment System in Website-Based Menteng Indah Housing, with the application of this system will facilitate citizens and security in the process of paying fees

Effective learning is a learning that affects students' math skills, one of which is the abil... more Effective learning is a learning that affects students' math skills, one of which is the ability of reasoning and proof. The ability of reasoning and proof consists of several stages: Recognize reasoning and proof as fundamental aspects of mathematics; Make and investigate mathematical conjectures; Develop and evaluate mathematical arguments and proofs; Select and use various types of reasoning and methods of proof. The purpose of this research is to know: (1) Is there any influence of PBL model in improving the students' ability mathematical of reasoning and proof in subject of vector analysis course?; (2) Is the PBL model better in improving the students' ability mathematical of reasoning and proof in subject of vector analysis course? This research is a quasi-experiment research. The data analysis technique is done from test stages of data description, prerequisite test is normality test, and hypothesis test using ANCOVA test. The results showed that: (1) There is an ...

Talenta Conference Series: Energy and Engineering (EE)

The aims of this study is to determine the optimum combustion temperature of kepok banana (Musa P... more The aims of this study is to determine the optimum combustion temperature of kepok banana (Musa Paradisiaca Linn cv. 'Saba') peel as a potassium source. Experiment was started by combustion kepok banana peel to ashes. Combustion was carried out by inserting 15 g of kepok banana peel into a muffle furnace at temperatures of 450, 500, 550 and 600oC for 3 and 5 hours. The content of potassium in the ash was extracted with pure water which ash-water ratio was 1:100 and the soaking time was 24 hours. Furthermore, analysis of the extract was carried based on various parameter such as normality, pH, electrical conductivity, and potassium content (as K2O). The best of potassium content obtained from ashes produced by combustion of kepok banana peel was 61.80% at temperatures of 550oC for 5 hours of combustion time.

Malikussaleh Journal of Mathematics Learning (MJML)

This study was conducted to determine whether there were significant differences between students... more This study was conducted to determine whether there were significant differences between students 'reasoning abilities taught using the PBL model and with the Computer Multimedia Assisted GI, and to determine whether or not there was an influence of interaction between learning models and students' initial abilities on mathematical reasoning abilities . This research is a comparative research with treatment. The population in this study were students of MTs Al-Washliyah 28 Sergai. The variables in this study are mathematical reasoning abilities by collecting data using a questionnaire and tests of mathematical reasoning abilities as well as student achievement tests. The analysis prerequisite test uses the Kolmogorov-Smirnov normality test with a sig (2-tailed) value for the Computer Multimedia Assisted PBL class is 0.200*>0.005 and the sig (2-tailed) value for the computer multimedia-assisted GI class is 0.132>0.005. Hypothesis testing uses 2 path analysis of variance...

KNAW Narcis. Back to search results. Publication Strengthening fresh and processed rambutan value... more KNAW Narcis. Back to search results. Publication Strengthening fresh and processed rambutan value chains (2008) Open access. Pagina-navigatie: Main. ...

The horticultural industry in Indonesia is progressively moving to apply Good Agricultural Practi... more The horticultural industry in Indonesia is progressively moving to apply Good Agricultural Practices (GAP) with the aim of producing sustainably as well as guaranteeing food safety. While the Ministry of Agriculture has put a lot of effort in assisting farmers to comply to the national IndoGAP and become Si Sakti certified uptake has been slower than expected. This study has tried to identify the constraints for compliance to GAP such that with this knowledge incentives for GAP compliance can be formulated.

Tropical biomedicine

Microscopic detection of active phase of lymphatic filariasis is indicated by the presence of mic... more Microscopic detection of active phase of lymphatic filariasis is indicated by the presence of microfilaria in whole blood. This method is not sensitive and requires relatively large amount of blood sample. PCR allows very sensitive detection of the parasite DNA using a smaller amount of blood; and the use of dried blood spots facilitates sample transportation. Nevertheless, limited studies have been reported on PCR using dried blood spot for detection of Brugia malayi. In this study, we investigated the effects of concentrating whole blood genomic DNA sample and the amplification methods [conventional PCR (C-PCR) and real-time PCR] on the detection of B. malayi DNA from dried blood spots from a very low endemic area in Malaysia. Both C-PCR and real-time PCR detected 2 out of 18 (11%) samples as positive from non-concentrated genomic DNA preparations. After the DNA samples were pooled and concentrated, both C-PCR and realtime PCR detected B. malayi DNA amplifications in 7 out of 18 (39%) samples. However one sample which showed faint band in C-PCR was detected as highly positive in real-time PCR. In conclusion, both C-PCR and real-time PCR using dried blood spots from a low endemic area demonstrated equal sensitivity for detection of B. malayi DNA.

KNAW Narcis. Back to search results. Publication Backstopping & support mission HORTIN II sup... more KNAW Narcis. Back to search results. Publication Backstopping & support mission HORTIN II supply chain... (2008) Open access. Pagina-navigatie: Main. ...

Medical Journal of Indonesia, 1994

Drugs, 1995

... Nelwan RH, Hendarwanto, Zulkarnain I, Gunawan J, Supandiman I, Yusuf H, Soedjana P, Syahroni ... more ... Nelwan RH, Hendarwanto, Zulkarnain I, Gunawan J, Supandiman I, Yusuf H, Soedjana P, Syahroni A. ... MeSH Terms. Adult; Anti-Infective Agents/adverse effects; Anti-Infective Agents/therapeutic use*; Ciprofloxacin/adverse effects; Ciprofloxacin/therapeutic use*; ...

Archives of Environmental Health: An International Journal, 2003

A total of 16,663 pairs of junior high school students and their mothers in Indonesian cities wer... more A total of 16,663 pairs of junior high school students and their mothers in Indonesian cities were surveyed, using a self-administered questionnaire, to measure the effect of air pollution on respiratory health and the cost of associated illness. Multiple regression analysis showed that the prevalence rates of the symptoms of cough, phlegm, persistent cough, wheezing without a cold, and asthma, in the student and mother groups, were significantly correlated with the nitrogen dioxide (NO2) emitted along large roads near their residences, and to a lesser extent with smoking. In Central Jakarta and Tangerang, where the average NO2 concentrations were highest (37 ppb and 31 ppb, respectively), reduction of NO2 to a proposed level of 25 ppb could yield savings in mean direct out-of-pocket expense per capita for treatment of the above symptom(s) of 15,639-18,165 Indonesian rupiah (6.80-7.90 US dollars), and reduce average work/school days lost per capita by 3.1-5.5 days.

The minimum cost ﬂow problem is a linear optimazation model which can be solved by Simplex method... more The minimum cost ﬂow problem is a linear optimazation
model which can be solved by Simplex method. This paper proposed a sensitivity analysis method for minimum cost ﬂow problem such that maintains the structure of the optimal solution. We improved a sensitivity analysis method which is formerly applicable to a tree solution. the proposed method preserves solution of upper bounds at upper bounds
and those of lower bounds at lower bounds.

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Talenta Conference Series: Energy and Engineering (EE)

Malikussaleh Journal of Mathematics Learning (MJML)

Tropical biomedicine

Medical Journal of Indonesia, 1994

Drugs, 1995

Archives of Environmental Health: An International Journal, 2003