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Browsing Sci - Theses by Issue Date

Now showing items 1-20 of 6438

Counter studies of cosmic ray nucleons by neutron monitor at latitude 13° 46'(N)

Pairoaj Tiranathanagul (Chulalongkorn University, 1968)

The cosmic radiation intensity-time variation at latitude 13° 46’(N) was investigated by using an I.G.Y. Standard type neutron monitor with 3 BF₃ counters which was constructed at the Physics building of Chulalongkorn ...
Temperature dependence of spin relaxation time in pure water

Piyasak Praditwong (Chulalongkorn University, 1972)

The temperature dependence of spin-lattice relaxation time and the transverse relaxation time in pure water were investigated by the pulse nuclear magnetic resonance method in the temperature range 4 - 100°C. The spin-lattice ...
Competition kinetics studies of amino acids and nitrate ions in irradiated aqueous solutions

Charumal Phasukvanich (Chulalongkorn University, 1974)

The yields of nitrite ion obtained after – irradiation of solutions containing (A) nitrate ion and glycine and (B) nitrate ion and alanine were measured spectrophotometrically. The primary yields of hydrated electron were ...
On the curvatures of curves in educlidean N-space

Piroj Sattayatham (Chulalongkorn University, 1976)

The object of this Thesis is to generalize some Theorems on curves which lie in Euclidean 3-spece to more general case, i.e., we shall prove these theorems when our curves lie in Euclidean n-space In the first part of this ...
Factorizable semigroups

Chanasak Baitiang (Chulalongkorn University, 1978)
Investigations of solid-reactions of chromium, iron cobalt and copper compounds

Wilaiwon Boonyawiwat (Chulalongkorn University, 1978)
Modified cumulant treatment of the mixed molecular crystal problem

Vittaya Amornkitbamrung (Chulalongkorn University, 1981)
Invertible matrices over semirings

Surachai Sombatboriboon (Chulalongkorn University, 1987)
Theoretical study of Brownian motion in liquid

Rachai Prakobkarn (Chulalongkorn University, 1987)
Exact propagator of a two dimensional system

Udom Robkob (Chulalongkorn University, 1987)

The propagator for an electron moving in a two-dimensional system under the influence of a transverse magnetic field B, a time varying external force field f(s) and a nonlocal harmonic force, is evaluated exactly by ...
The development of headspace technique for analysis of some semivolatile organic compounds in water

Sujinda Rojanasaksothorn (Chulalongkorn University, 1988)

A headspace technique has been developed for the determination of semivolatile organic compounds i.e., ethylbenzene, chlorobenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene and 1,4-dichlorobenzene in water samples. The ...
The solvation structure of lithium ion in water-ammonia mixture by Monte Carlo method

Suchada Kheawsrikul (Chulalongkorn University,, 1988)

The solvation structure of lithium ion in 18.45 mole % aqueous ammonia at 20ºC is investigated, using the Metropolis Monte Carlo method, The system consists of 202 particles, one lithium ion, 37 ammonia and 164 water ...
Isolation of alkaline lipase producing soil bacteria

Pises Liawsakul (Chulalongkorn University, 1999)

Two of 350 lipase producing bacterial strains isolated from soils were selected, name ALP-40.3 and ALP-42.11, and identified biochemically and bacteriologically to possibly be Psuedomomas sp. ALP-40.3 strain grew under ...
Chemical constituents and biological activity from the stem barks of Croton oblongifolius Roxb. from Amphoe Dan Sai, Loei province

Kullaphan Siriwat (Chulalongkorn University, 1999)

In the investigation of chemical constituents of the stem barks of Croton oblongifolius Roxb., a new diterpenoids compound, cleistantha-4(18), 13(17), 15-trien-3-oic acid (1) was isolated from crude hexane and crude ethyl ...
Photoisomerization studies of azobenzene crown ether calix [4] arenes for applications in alkali metal ion extraction

Bongkot Pipoosananakaton (Chulalongkorn University, 1999)

Two new compounds, derivatives of azobenzene crown ether calix[4]arenes 5 and 8 were prepared by two pathways. In the first pathway, two nitrophenoxy glycolic chains were attached to t-butylcalix[4]arenes ring in a 1, 3 ...
Characteristic curve at low bias of a heavily doped GaAs and metal junction

Prathan Srivilai (Chulalongkorn University, 1999)

We have determined the electrostatic potential at the junction between a metal and heavily doped n-type GaAs from the Poisson equation by including the majority carriers. At sufficiently high doping (donor concentration ...
Solutions of the system of functional equations f(x o y) = f(x)g(y) + g(x)f(y) and g(x o y) = g(x)g(y) - f(x)f(y) on semigroups

Kanokporn Palasri (Chulalongkorn University, 1999)

Let (S, ๐) be any semigroup, (F, +, .) be a field of characteristic different from 2. We determine all pairs f,g:S -> such that f(x๐y) = f(x)g(y)+g(x)f(y), g(x๐y) = g(x)g(y)-f(x)f(y)}(*) for all x,y ใน S. It is proved that ...
Physiological responses of postlarva black tiger prawn Penaeus monodon to combined effects of salinity and water soluble fraction of dubai crude oil

Warawan Sukrarurk (Chulalongkorn University, 1999)

A study of effects of salinity and concentrations of water soluble fraction (WSF) of Dubai crude oil on black tiger prawn Penaeus monodon postlarvae was divided into 2 processes; acute toxicity testing and sublethal toxicity ...
Effect of SAN on the mechanical properties and morphology of ABS

Supachai Rinsom (Chulalongkorn University, 1999)

The effects of melt flow index (MFI) and acrylonitrile (AN) content of the styrene-acrylonitrile copolymer (SAN) on the mechanical properties and morphology of acrylonitrile butadiene styrene terpolymer were studied. A ...
Minimal quasi-ideals of some matrix rings

Pattita Juntarakhajorn (Chulalongkorn University, 1999)

Let R be a ring. An additive subgroup Q of a ring R is said to be a quasi-ideal of R if RQ intersection QR Q. For a R, let (a)q denote the quasi-ideal of R generated by a. A quasi-ideal Q of R is said to be minimal if Q ...

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