cover
Article Per Year (5 Year)
All
Home Page
OAI Link
Editorial Team
Contact
Reviewer
Google Scholar
Contact Name
Agung Nugroho
Contact Email
jmfs@lppm.itb.ac.id
Phone
+6222-86010051
Journal Mail Official
jmfs@lppm.itb.ac.id
Editorial Address
ITB Journal Publisher, LPPM ITB, Center for Research and Community Services (CRCS) Building 6th & 7th Floor , Jl. Ganesha No. 10 Bandung 40132, Indonesia
Location
Kota bandung,
Jawa barat
INDONESIA
Journal of Mathematical and Fundamental Sciences
Published by Institut Teknologi Bandung
ISSN : 23375760     EISSN : 23385510     DOI : https://doi.org/10.5614/j.math.fund.sci.
Core Subject : Science, Education,
Astronomy Chemistry Earth & Planetary Sciences Mathematics Physics
Journal of Mathematical and Fundamental Sciences welcomes full research articles in the area of Mathematics and Natural Sciences from the following subject areas: Astronomy, Chemistry, Earth Sciences (Geodesy, Geology, Geophysics, Oceanography, Meteorology), Life Sciences (Agriculture, Biochemistry, Biology, Health, Medical, Pharmacy), Mathematics, Physics, and Statistics.
Arjuna Subject : Matematika - Matematika (Lain-Lain)
Articles 689 Documents
 48   49   50   51   52 
Recovery and Stacking Faults of α Ag-Sn Alloys Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 2 (1975)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract. X-ray diffraction peak shift can be used to determine the recovery temperature of face centered cubic metals. Using this method is was found that filed α Ag-Sn chips recover at temperature between 100° and 200°C. The stacking fault energy was found to be decreasing with increasing tin content.  Ringkasan. Penggeseran puncak difraksi sinar-X dapat dipergunakan untuk menentukan temperatur pemulihan dari logam-logam dengan struktur kubus berpusat sisi. Dengan cara tersebut dapat ditentukan bahwa serbuk kikiram dari α Ag-Sn pulih kembali pada temperature antara 100° dan 200°C. Diketemukan pula bahwa energi salah tumpuk dari panduan-tersebut berkurang dengan bertambahnya konsentrasi timah putih.
Kriostat Nitrogen Cair untuk Difraksi Neutron Marsongkohadi Marsongkohadi; Anung Kuswono
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 2 (1975)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ringkasan. Diuraikan perancangan dan pembuatan suatu kriostat nitrogen cair untuk percobaan difraksi neutron. Kriostat tersebut dibuat dari stainless-steel dan tembaga, sedangkan cendelanya dari aluminium setebal 1 mm. Voluma wadah nitrogen cair adalah delapan liter, dan diisolir dari udara luar dengan dinding vacuum yang bertekanan 2 x 10-4 torr. Nitrogen cair menguap rata-rata sebanyak 1,3 liter per jam, sedangkan "cool down losses" adalah dua liter. Suhu cuplikan diukur dengan thermometer resistor karbon atau dengan thermokopel tembaga konstantan. Suatu alat untuk mengukur tinggi permukaan nitrogen cair, telah dibuat dari beberapa resistor karbon. Dengan mengisi kriostat sebanyak limabelas liter nitrogen cair, suhu cuplikan dapat dipertahankan pada 110°K, selama Sembilan jam. Abstract. The design and construction of an all-metal liquid nitrogen cryostat for neutron diffraction experiments is described. The cryostat is made of stainless-steel and copper with 1 mm thick aluminum window. The liquid nitrogen container has a volume of eight liters, and is isolated from the surrounding atmosphere by a vacuum jacket, with a pressure of 2 x 10-4 torr. The mean evaporation rate of the liquid nitrogen is 1.3 liters per hour, whereas the cool down losses is two liters. The temperature of the sample is measured with a carbon resistor thermometer or a copper constantan thermocouple. A dipmeter is constructed of several carbon resistors. By filling the cryostat with fifteen liters of liquid nitrogen, the temperature of the sample is held constant 110°K, for nine hours. 
Pemakaian Resistor Karbon dan Dioda Sambungan P-N dalam Thermometry Suhu Rendah Marsongkohadi Marsongkohadi; A. Kreshna; Ngurah Made Agung
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ringkasan. Karakteristik dari resistor karbon dan diode sambungan p-n yang terdapat di pasaran, telah diteliti pada suhu antara 80°K dan 220°K. Data-data dari resistor karbon, sesuai dengan persamaan tiga-parameter dari Clement-Quinnell. Suhu yang dihitung dari persamaan ini, berbeda +- 0,5 persen dengan suhu yang diukur. Kepekaan thermometriknya adalah sedemikian rupa, sehingga jika ketelitian pengukuran tahanan 0,1 persen, maka perbedaan suhu sebesar 0,4°K pada 93°K dapat dideteksi. Reprodusibilitas dari pengukuran suhu ini lebih kurang 4 persen. Pada beberapa diola sambungan p-n yang diselidiki, karakteristik T-V pada suhu kamar sampai suhu nitrogen cair, hampir linear. Selain dari itu, diode ini menunjukkan reprodusibilitas yang baik setelah mengalami goncangan thermis. Kecuraman dari karakteristik T-V dengan arus sebagai parameter dapat diterangkan dengan menganggap bahwa sambungan p-n tersebut mengalirkan arus rekombinasi-generasi, sesuai dengan teori Sah, Noyce dan Shockley. Abstract. The characteristic of some commercially manufactured carbon resistors and p-n junction diodes are measured from 80°K to 220°K. Datas of the resistors fit the three-parameter equation of Clement-Quinnell. Temperatures calculated by this equation are within 0.5 percent, of the measured temperatures. Thermometric sensitivity is such that by measuring resistance to one part in 1000, it is possible to detect temperature changes of 0.4°K at 93°K. Temperatures are reproducible within about 4 percent, from run to run. In some p-n junction diodes, we have observed nearly linear T-V characteristic from room temperature to liquid nitrogen temperature. In addition these diodes exhibit good repeatability on temperature cycling. The slope of the T-V characteristic with current as a parameter, is explained by assuming that the device conducts primarily recombination-generation current according the theory of Sah, Noyce and Shockley. 
The Growth and Orientation of Platelet Ag3Sn Single Crystals Harsono Wirjosumarto
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Kristal-kristal tunggal Ag3Sn pipih dengan tebal 200 μm dan 5 mm pada dimensi yang lain, dapat dihasilkan dengan cara "temperature gradient" dari suatu ingot Ag-Sn dengan komposisi 40% berat Ag dan 60% berat Sn. Permukaan bidang pipih dari Kristal-kristal tunggal yang didapat mempunyai bidang kristalografi yang sama. Dengan cara difraksi sinar X, dapat ditunjukkan bahwa bidang tersebut adalah bidang (020).Platelet single crystals of Ag3Sn of 200 μm thickness and 5 mm in the other dimensions can be produced by temperature gradient method from an ingot of Ag-Sn alloy with a composition of 40 wt % Ag and 60 wt % Sn. It was found that the platelet surfaces have the some crystallographic plane. X-ray diffraction study showed that the plane is (020) plane.
Survey on Important Pests of Rice and Vegetables with Emphasis on Population Trend and its Damage Soelaksono Sastrodihardjo
Journal of Mathematical and Fundamental Sciences Vol. 9 No. 1 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ringkasan. Telah dilakukan pengamatan tentang komponen serangga dan arthopoda lain pada asosiasi padi dan sayuran. Didapatkan bahwa komponen tersebut masih cukup berarti dari segi rantai interaksi ekologis. Dilakukan penafsiran terhadap pola populasi penggerek batang padi serta serangga hama sayuran dengan cara sampling stadia muda dan dewasa. Diketemukan pola populasi yang tidak begitu bervariasi untuk suatu daerah yang luas di Jawa Barat. Abstract. The insects and other arthropode components of rice and vegetables association were investigated. It was found that these components were still meaningful from the aspect of ecological interaction. Estimate of rice-borers population trend and also of the vegetables pests were carried out by means of immatures and matures sampling. Apparently the variation of the population trend of rice as well as vegetable pests was small within a relatively large area in West Java. 
A Note on the Flare Stars in the Coalsack B. Hidajat; A. Kuncoro
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 3 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ringkasan. Didalam tulisan ini dilaporkan penemuan 5 buah "flare stars" di daerah Coalsack.  Abstract. The discovery of 5 flare stars in the Coalsack is reported. 
Schouten Bracket of Holomorphic Tensors of a Kahlerian Manifold Jorga Ibrahim
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 3 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Abstract. It is shown that the Schouten bracket of holomorphic tensors of a compact kahlerian manifold W defines a structure of graded complex Lie algebra on the space of holomorphic tensors of the manifold. We obtain an important proposition which generalizes a wellknown result of Lichnerowicz [6,7].Ringkasan. Kita perlihatkan bahwa "Schouten bracket" dari pada tensor-tensot holomorph milik suatu manifold kahler yang kompak W mendefinisikan suatu struktur "graded complex Lie algebra" pada ruang tensor-tenso holomorph dari pada manifold tersebut. Disini diperoleh suatu proposisi yang penting yang memperluas sebuah hasil yang terkenal dari Lichnerowicz [6,7]. 
Offshore Tertiary Sedimentary Basins in Indonesia R.P. Koesoemadinata; A. Pulunggono
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 3 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Ringkasan. Cekungan-cekungan sedimen berumur Tersier yang kaya akan minyak dan gas bumi terutama terdapat di bagian barat Indonesia. Cekungan-cekungan ini dahulunya disebut sebagai "ideogeosynclines", dan terdapat sekeliling tepi suatu masa daratan pre-Tersier yang diperkirakan dan dinamakan "Sunda Shelf". Dewasa ini daerah tersebut ditutup oleh laut-laut Epikontinental yang dangkal (Laut Jawa, Laut China Selatan). Bahagian luarnya cekungan-cekungan ini dibatasi oleh busur kepulauan volkanik dalam. Penyelidikan-penyelidikan seismic lautan yang sangat luas, yang dilakukan baru-baru ini dan disusul oleh pengeboran telah membuktikan adanya penerusan dari beberapa cekungan ini kelepas pantai (antara lain Sumatra Utara, Jawa Barat, Jawa Timur dan Kalimantan Timur). Lebih penting lagi penyelidikan tersebut telah membuka tabir bahwa paparan Sunda yang semula diperkirakan bertindak sebagai sumber-sumber sedimen selama "Tersier" dalam kenyataannya terdiri dari banyak cekungan-cekungan sedimen dan peninggian-peninggian yang memisahkannya, dan hanya daerah antara Bangka, Belitung, serta kepulauan Natuna-Anambas adalah daratan Sunda yang sebenarnya. Peninggian-peninggian ini bertindak sebagai sumber dari berbagai lapisan sedimen dan beberapa diantaranya diwakili oleh pulau-pulai pre-Tersier antara lain Bangka, Belitung dan Karimun Jawa. Pematahan bongkah dari batuan dasar ternyata bertanggung jawab atas perkembangan cekungan-cekungan ini, dan juga mengendalikan pengendapan maupun tektonik dari lapisan Tersier yang menutupinya. Selanjutnya explorasi lepas-pantai juga telah membuktikan adanya lapisan-lapisan sedimen tersier di antara Busur Kepulauan Volkanik dalam (misalkan Sumatra) dan busur Non-volkanik luar (pulau Nias dan lain-lain). Sampai saat ini belum terdapat cukup data-data untuk membahasa cekungan sedimen lepas-pantai di Indonesia Timur. Penyelidikan-penyelidikan geofisika laut dan pengeboran masih dalam kemajuan dewasa ini. Lokasi-lokasi pengeboran lepas-pantai masih sangat banyak yang direncakan untuk tahun-tahun yang akan datang. Sehingga masih terlalu pagi untuk membahas implikasi-implikasi geologi yang luas. Abstract. Prolific Tertiary sedimentary basins are mainly located in Western Indonesia. They have previously been described as "ideo-geo-synclines", and are situated around the periphery of a supposed pre-Tertiary land-mass the "Sunda Shelf", now largely covered by shallow epicontinental seas, (Java Sea, South China Sea). Outward they are bordered by the Inner Volcanic island arc. Recent extensive marine seismic investigations and subsequent drilling have confirmed the extension of some of these basins offshore (e.g. North Sumatra, West Java, East Java and East Kalimantan). More important, however, these surveys have revealed that the "Sun Shelf" which supposedly served as source of sediments during the Tertiary, actually consist of numerous sedimentary basins and intervening uplifts, leaving the area between Bangka-Billiton and Natuna-Anambas Islands as the Sunda-land proper. These uplifts served as source of sediments and some are represented by pre-Tertiary islands, e.g. Bangka, Billiton and Karimun Jawa. Basement block-faulting is apparently responsible for the development of these basins, and controlled depositions as well as tectonics of the Tertiary cover. Further offshore exploration has also confirmed the presence of Tertiary sediments between the Inner Volcanic islands (c.q. Sumatra) and the outer non-volcanie arc (c.q. Nias). There is no sufficient data to date to describe offshore sedimentary basins is eastern Indonesia. Marine geophysical surveys and drilling are still in progress at present. Numerous offshore drilling locations are scheduled for several years, so that it is still too preliminary to discuss the broad geological implications. 
Mafic and Ultramafic Rock Association in the East Arc of Sulawesi R. Soeria Atmadja; J.P. Golightly; B.N. Wahju
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 2 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Busur Timur Sulawesi, yang terdiri dari Sulawesi Timur dan Tenggara, sebagian besar ditempati oleh suatu komplek luas terdiri dari kelompok batuan ultramafic yang diperkirakan berumur Mososoik hingga Tersier Bawah. Batuan-batuan tersebut dijumpai bersama dengan instrusi-intrusi batuan beku yang bersusunan gabro. Komplek batuan ultramafik ini merupakan suatu lajur yang terputus-putus, dan dapat diikuti dari bagian paling timur dari Sulawesi Timur ke arah barat dan membelok mengikuti arah struktur Sulawesi Tenggara. Komplek ini terdiri dari berbagai batuan ultramafic terutama harsburgit dan lersolit, serta dunit & piroksenit. Sebagian besar daerah yang diselidiki terdiri dari batuan-batuan ultramafic yang mengalami berbagai derajat serpentinisasi. Di beberapa bagian komplek ini, batuan-batuan ultramafic menunjukkan adanya korok-korok dan intrusi-intrusi kecil yang bersusunan gabro serta diorit. Asosiasi batuan tersebut dicirikan pula oleh bentuk dan penyebaran yang tidak teratur. Maksud dari pada tulisan ini adalah untuk mengemukakan data baru mengenai petrologi dan tektonik dari asosiasi batuan-batuan basa dan ultramafic ditinjau dari perkembangan teori dewasa ini. Penyelidikan yang bersifat pendahuluan ini didasarkan pada hasil analisa petrografi batuan, hubungan batuan-batuan satu sama lainnya di lapangan, serta pemetaan yang dilakukan selama berlangsungnya kegiatan explorasi geologi oleh P.T. International Nickel Indonesia. The East Arc (East and South-East Arms) of Sulawesi is largely occupied by a huge complex of ultramafic rocks of presumably late Mesozoic to early Tertiary age. The ultramafic rocks of Sulawesi are closely associated with small masses of gabbroic rocks. The ultramafic complex takes the form of discontinuous belts which can be traced from the eastern-most part of the Eastern Arm west-ward curving to the South-East following the Structural trend of the South-East Arm. The complex is made up chiefly of harzburgite, lherzolite, with some dunite and pyroxenite. Over most parts of the investigated area, these rocks have been serpentinized to variable degrees. Dikes and small intrusive bodies of gabbroic and dioritic composition have been encountered in many places within this belt. This rock assemblage is characterized by irregularity in form and distribution. The purpose of this paper is to bring up-to-date what is known on the petrology and tectonic setting of the mafic and ultramafic rocks in the light of new available data and current theories, the present preliminary study is mainly based upon petrographic data, and field relations obtained from recent geological exploration activities and mapping by P.T. International Niekel Indonesia. 
Perluasan Mengenai Koefisien Realibilitas dari Kuder-Richardson (KR-20) Sunardi Wirjosudirdjo
Journal of Mathematical and Fundamental Sciences Vol. 8 No. 2 (1974)
Publisher : Institute for Research and Community Services (LPPM) ITB

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Konsistensi dari item-item dalam suatu test biasanya diukur dengan menggunakan rumus Kuder-Richardson (KR-20), yaitu: (1). Jelas kiranya bahwa (1) hanya dapat digunakan dalam hal penilaian setiap item 0 atau 1. Apabila nilai setiap itemnya tidak 0 atau 1 saja, maka (1) menjadi: (2) dimana si merupakan deviasi standard dari item ke-i. Selanjutnya, rumus (1) maupun (2) biasanya hanya digunakan dalam hal test direncanakan sedemikian rupa agar item-itemnya di dalam test diharapkan homogin. Apabila item-item di dalam test tidak diarahkan agar homogin, maka kita dapat memberikan bobot pada setiap item sehingga r menjadi maksimum. Ternyata bahwa bobot dari item ke-i, ai, harus memenuhi sedemikian rupa sehingga ai si merupakan komponen ke-i dari vector karakteristik yang berkorespondensi dengan harga karakteristik terbesar dari matriks korelasi item-itemnya. Apabila koefisien korelasi antar item semuanya positip, ternyata bahwa ai adalah positip dan tunggal. The internal consistency of a test is usually measured by using Kuder-Richardson's formula called KR-20, i.e. equation (1). It is clear that formula (1) is only applicable to the case where the score of each item is 0 or 1. If the score of each item is not 0 or 1, then (1) can be written as equation (2). Where si is the standard deviation of the ith item. Furthermore, formula (1) or (2) is applicable for the case where the test is designed so that the items in the test intended to be homogeneous. If the items of the test are not intended to be homogeneous, then we can use weighting so that r becomes maximum. It happens that the weight ai of the ith item should satisfy so that ai si is the ith component of the characteristic vector correspond to the greatest eigenvalue of the correlation matrix between items. If the correlation coefficients between item are positive then the ai's are positive and unique. 

Page 50 of 69 | Total Record : 689

 48   49   50   51   52 

Filter by Year

1961 2024


Reset
Filter By Issues
All Issue Vol. 56 No. 3 (2024) Vol. 56 No. 1 (2024): (In Progress) Vol. 55 No. 3 (2024) Vol. 55 No. 2 (2023) Vol. 55 No. 1 (2023) Vol. 54 No. 3 (2023) Vol. 54 No. 2 (2022) Vol. 54 No. 1 (2022) Vol. 53 No. 3 (2021) Vol. 53 No. 2 (2021) Vol. 53 No. 1 (2021) Vol. 52 No. 3 (2020) Vol. 52 No. 2 (2020) Vol. 52 No. 1 (2020) Vol. 51 No. 3 (2019) Vol. 51 No. 2 (2019) Vol. 51 No. 1 (2019) Vol. 50 No. 3 (2018) Vol. 50 No. 2 (2018) Vol. 50 No. 1 (2018) Vol. 49 No. 3 (2017) Vol. 49 No. 2 (2017) Vol. 49 No. 1 (2017) Vol. 48 No. 3 (2016) Vol. 48 No. 2 (2016) Vol. 48 No. 1 (2016) Vol. 47 No. 3 (2015) Vol. 47 No. 2 (2015) Vol. 47 No. 1 (2015) Vol. 46 No. 3 (2014) Vol. 46 No. 2 (2014) Vol. 46 No. 1 (2014) Vol. 45 No. 3 (2013) Vol. 45 No. 2 (2013) Vol. 45 No. 1 (2013) Vol. 44 No. 3 (2012) Vol. 44 No. 2 (2012) Vol. 44 No. 1 (2012) Vol. 43 No. 3 (2011) Vol. 43 No. 2 (2011) Vol. 43 No. 1 (2011) Vol. 42 No. 2 (2010) Vol. 42 No. 1 (2010) Vol. 41 No. 2 (2009) Vol. 41 No. 1 (2009) Vol. 40 No. 2 (2008) Vol. 40 No. 1 (2008) Vol. 39 No. 1-2 (2007) Vol. 38 No. 2 (2006) Vol. 38 No. 1 (2006) Vol. 37 No. 2 (2005) Vol. 37 No. 1 (2005) Vol. 36 No. 2 (2004) Vol. 36 No. 1 (2004) Vol. 35 No. 2 (2003) Vol. 35 No. 1 (2003) Vol. 34 No. 2&3 (2002) Vol. 33 No. 3 (2001) Vol. 33 No. 2 (2001) Vol. 33 No. 1 (2001) Vol. 32 No. 2 (2000) Vol. 32 No. 1 (2000) Vol. 31 No. 3 (1999) Vol. 31 No. 2 (1999) Vol. 31 No. 1 (1999) Vol. 30 No. 3 (1998) Vol. 30 No. 2 (1998) Vol. 30 No. 1 (1998) Vol. 29 No. 1/2 (1996) Vol. 27 No. 3 (1994) Vol. 27 No. 2 (1994) Vol. 25 No. 2/3 (1992) Vol. 25 No. 1 (1992) Vol. 24 No. 2/3 (1991) Vol. 24 No. 1 (1991) Vol. 23 No. 1 (1990) Vol. 22 No. 1/2/3 (1989) Vol. 21 No. 2/3 (1988) Vol. 21 No. 1 (1988) Vol. 20 No. 1/2 (1987) Vol. 20 No. 3 (1987) Vol. 19 No. 2/3 (1986) Vol. 19 No. 1 (1986) Vol. 18 No. 2/3 (1985) Vol. 18 No. 1 (1985) Vol. 17 No. 3 (1984) Vol. 17 No. 2 (1984) Vol. 17 No. 1 (1984) Vol. 16 No. 3 (1983) Vol. 16 No. 2 (1983) Vol. 16 No. 1 (1983) Vol. 15 No. 3 (1982) Vol. 15 No. 2 (1982) Vol. 15 No. 1 (1982) Vol. 14 No. 1/2 (1981) Vol. 14 No. 3 (1981) Vol. 13 No. 1/2 (1980) Vol. 13 No. 3 (1980) Vol. 12 No. 3 (1979) Vol. 12 No. 2 (1979) Vol. 12 No. 1 (1979) Vol. 11 No. 3 (1978) Vol. 11 No. 2 (1977) Vol. 11 No. 1 (1976) Vol. 10 No. 3 (1976) Vol. 10 No. 2 (1975) Vol. 10 No. 1 (1975) Vol. 9 No. 3 (1975) Vol. 9 No. 2 (1975) Vol. 9 No. 1 (1974) Vol. 8 No. 3 (1974) Vol. 8 No. 2 (1974) Vol. 8 No. 1 (1974) Vol. 7 No. 4 (1974) Vol. 7 No. 3 (1973) Vol. 7 No. 2 (1973) Vol. 7 No. 1 (1973) Vol. 6 No. 4 (1972) Vol. 6 No. 3 (1972) Vol. 6 No. 2 (1971) Vol. 6 No. 1 (1971) Vol. 5 No. 1 (1970) Vol. 4 No. 4 (1970) Vol. 4 No. 3 (1969) Vol. 4 No. 2 (1968) Vol. 4 No. 1 (1967) Vol. 3 No. 4 (1965) Vol. 3 No. 3 (1965) Vol. 3 No. 2 (1964) Vol. 3 No. 1 (1964) Vol. 2 No. 4 (1963) Vol. 2 No. 3 (1963) Vol. 2 No. 2 (1962) Vol. 2 No. 1 (1962) Vol. 1 No. 4 (1961) Vol. 1 No. 3 (1961) Vol. 1 No. 2 (1961) Vol. 1 No. 1 (1961) More Issue