12-2008

TP CH PHT TRIN KH&CN, TP 11, S 12 - 2008

MC LC

Ha Th Hong Yn Nguyn Hu Phng

ng dng bin i Wavelet v mng nron pht hin v chn on cc ha vi rt nh trn nh nh

Hunh Hu Thun inh Quang Hi Cao Trn Bo Thng Nguyn Hu Phng

Thit k SOPC dng cho cc ng dng x l nh thi gian thc

Phm Th Bo

Xy dng nh cht lng tt t hai nh c ly t m hnh camera bng phng php ga v bin i wavelet ri rc

Trn Trng c V Minh Hi

Pht trin ng dng GIS trn PDA

Bi Anh Quc

ng Vn Nghn

L Tm Phc

Trn i Nguyn Hunh Hu Ngh

V Vn Nho

L in Nhi Nguyn Ngc Thin

ng dng cng ngh to mu nhanh to chi tit cy ghp s no

L Hng Ph

Nguyn c Lng

i Ngha

Nghin cu ch to ch phm biocoffee-1 t aspergillus niger v ng dng ln men cc loi c ph

Bi Thanh Huyn L Vn Vit Mn

Ln men cn bng nm men c nh trong trong cc mi trng c nng glucose ban u khc nhau

Tn N Minh Nguyt Nguyn Th Hin Lng L Ngc Liu L Vn Vit Mn

nh hng hm lng tannin ban u trong dch nho n ng hc qu trnh ln men ru vang, s dng nm men c nh trong gel alginate

Nguyn Tn Dng Trnh Vn Dng Trn c Ba

Nghin cu phng php xc nh t l nc ng bng v nhit lnh ng thch hp ca vt liu m giai on 1 trong sy thng hoa )

L Song Giang Trn Th Ngc Triu

Tnh ton dng chy trong sng rch cn gi bng m hnh ton s 2 chiu

Hunh Th Hng Ng La Th Cang

ng ha s liu bng phng php bin phn bn chiu trong d bo thi tit bng phng php s tr

Phm Quang Vinh c im thch hc, thch a ha granitoid vng ni Hn

Trn Ph Hng Thng v Chu Vin, Long Hi, B Ra -Vng Tu Phm Nhn Ha

Chu Quc Thng nh gi hiu qu ca h cn ma st bin thin vi cng trnh chu ti trng ng t

L Vn Trung H Tng Minh nh

ng dng k thut insar vi phn trong quan trc bin dng mt t khu vc Thnh Ph H Ch Minh

SCIENCE & TECHNOLOGY DEVELOPMENT, VOL 11, NO.12 - 2008

CONTENTS

Hua Thi Hoang Yen Nguyen Huu Phuong

Application of wavelet transform and neural networks to detect and diagnose microcalcifications in mammograms

Huynh Huu Thuan Dinh Quang Hai Cao Tran Bao Thuong Nguyen Huu Phuong

Designing a SOPC for real - time image processing applications

Pham The Bao Pham Thanh Trung

Building a good image from two color images of camera model using ga and discrete wavelet transform

Tran Trong Duc Vo Minh Hai

Developing GIS applications on PDA

Bui Anh Quoc Dang Van Nghin Le Tam Phuoc Tran Dai Nguyen Huynh Huu Nghi Vo Van Nho Le Dien Nhi Nguyen Ngoc Thien

Application of rapid prototyping in building skull implant

Le Hong Phu

Nguyen Duc Luong

Do Dai Nghia

Synthesizing biocoffee-1 and applying it in coffee fermentation

Bui Thanh Huyen Le Van Viet Man

Alcoholic fermentation with different initial glucose concentration using immobilized yeast in calcium alginate gel

Ton Nu Minh Nguyet Nguyen Thi Hien Luong Le Ngoc Lieu Le Van Viet Man

Influence of initial tannin concentration in must on the kinetics of wine fermentation, using yeast immobilized in calcium alginate gel

Nguyen Tan Dung

Trinh Van Dung

Tran Duc Ba

Researched the method to determine ice ratio in materials freeze and optimal temperature of freeze in stage 1 of processing freeze - drying)

Le Song Giang Tran Thi Ngoc Trieu

Numerical calculation of flow in rives at can-gio using two-dimensional numerical model

Huynh Thi Hong Ngu Four-dimensional variational data assimilation in

La Thi Cang numerical weather prediction

Pham Quang Vinh Tran Phu Hung

Petrographical, petrochemical characteristics of granitoids in Hon Thung and Chau Vien mountains, Long Hai area, Ba Ria-Vung Tau province

Pham Nhan Hoa Chu Quoc Thang

Assessment of the efficiency of variable friction damper for seismic protection of building

Le Van Trung Ho Tong Minh Dinh

Measuring ground subsidence in Ho Chi Minh City using differential insar technique

NG DNG BIN I WAVELET V MNG NRON PHT HIN V CHN ON CC HA VI RT NH TRN NH NH

Ha Th Hong Yn, Nguyn Hu Phng Trng i hc Khoa Hc T Nhin, HQG-HCM

(Bi nhn ngy 29 thng 03 nm 2007, hon chnh sa cha ngy 05 thng 05 nm 2008)

TM TT: Ung th v l chng ung th ph bin v l nguyn nhn th hai gy t vong do ung th ca ph n. nh X-quang s l mt trong nhng phng php thch hp pht hin sm ung th. Tuy nhin, rt kh phn bit gia cc ha vi lnh tnh v c tnh, iu ny dn n nhiu ci cht do pht hin tr hoc chn on sai. Mt h thng chn on nh nh (mammogram) tr gip bi my tnh c th cung cp mt nhn xt th hai nhm h tr cc bc s trong chn on. Cc ha vi rt nh tng ng vi cc thnh phn tn s cao ca ph nh, pht hin cc ha vi bng cch phn gii nh thnh cc di bng con cc tn s khc nhau dng phn tch a phn gii wavelet (MRA), loi b bng con tn s thp, v cui cng, xy dng li nh nh t cc bng con tn s cao. Mt tp 3 c trng ( bin thin, entropy v lch chun) c tnh t phn gii wavelet l 3 ng vo ca mng nron ch gm mt lp n vi 5 nt n. H thng thc thi tt trn cc nh d liu vi hiu sut t 91%. Kt qu ny cho thy u im ca php bin i wavelet kt hp mng nron trong cc h thng chn on tr gip bi my tnh.

T kha: Ung th v, nh nh, ha vi rt nh, bin i wavelet, mng nron.

APPLICATION OF WAVELET TRANSFORM AND NEURAL NETWORKS TO DETECT AND DIAGNOSE MICROCALCIFICATIONS IN

MAMMOGRAMS

Hua Thi Hoang Yen, Nguyen Huu Phuong University of Natural Sciences, VNU-HCM

ABSTRACT: Breast cancer accounts for the most cancer diagnoses and the second most cancer deaths of women. Digital mammography is one of the most suitable methods for early detection of breast cancer. However, it is very difficult to distinguish benign and malignant microcalcifications (MCs). There are many deaths caused by late detection or

misdiagnosis. An intelligent computer-aided diagnosis system (CAD) can provide a second opinion to the radiologists. Given that the MCs correspond to high frequency components of the image spectrum, detection of MCs is achieved by decomposing the mammograms into different frequency subbands, suppressing the low frequency subband, and, finally, reconstructing the mammogram from the high frequency subbands. A combination of 3 features (variance, entropy and standard deviation) computed by discrete wavelet transform are used as inputs to a simple neural network consiting of one hidden layer with 5 nodes. The system performs well with the accuracy of about 91% on data images. The result shows the advantage of wavelet transform associated with neural network in CAD system for mammography.

Keywords: Breast cancer, mammogram, microcalcification, wavelet transform, artificial neural network.

THIT K SOPC DNG CHO CC NG DNG X L NH THI GIAN THC

Hunh Hu Thun, inh Quang Hi, Cao Trn Bo Thng, Nguyn Hu Phng Trng i Hc Khoa Hc T Nhin, HQG HCM


TM TT: Ni dung bi bo l thit k h thng trn mt linh kin logic kh trnh (FPGA) dng cho cc ng dng x l nh thi gian thc. thc hin iu ny, chng ti thit k mt s b gia tc (Accelerator) tng tc x l kt hp vi mt s k thut x l c bit (nh truy xut b nh trc tip DMA, nhiu Master). Kt qu c th nghim trn DSP Development Kit s dng FPGA Stratix EP2S60F1020C4 ca hng Altera [1] dng cc phn mm SoPC Builder, NIOS II IDE v Modelism lm mi trng kim tra kt qu v tch hp phn cng/ phn mm.

T kho: FPGA, b gia tc, DMA, SoPC, x l nh thi gian thc.

DESIGNING A SOPC FOR REAL - TIME IMAGE PROCESSING APPLICATIONS

Huynh Huu Thuan, Dinh Quang Hai, Cao Tran Bao Thuong, Nguyen Huu Phuong University of Natural Sciences, VNU HCM

ABSTRACT: This paper presents our design of a System On a Programmable Chip (SoPC) for real - time image processing applications. To do this, some accelerators are designed and integrated into a FPGA chip in order to process data at a high speed. Besides, special techniques (such as DMA, multiple Maters) are also used to speed up the system. The result is tested on a DSP Development Kit using FPGA Stratix II EP2S60F1020C4 of Altera Corporation. SoPC Builder, NIOS II IDE and Modesim are used for testing and integrating hardware/software.

Keywords: FPGA, Accelerator, DMA, SoPC, Real-time image processing.

XY DNG NH CHT LNG TT T HAI NH C LY T M

HNH CAMERA BNG PHNG PHP GA V BIN I WAVELET RI RC

Phm Th Bo, Phm Thnh Trung Trng i hc Khoa hc T nhin, HQG-HCM

TM TT: Chng ti xy dng mt h thng cho php nhn c mt nh c cht lng tt t m hnh hai camera. M hnh ca chng ti da trn h thng th gic ca con ngi, vi hai camera nh hai mt ngi; mi mt s nhn mt nh ri truyn v no b tng hp thnh mt nh m cht lng s tt hn tng hnh nh ca tng mt. Chng ti trnh by mt qu trnh tm mi tng quan ca hai nh c ly t hai camera, da vo mi tng quan ny chng ti tng hp mt nh mi c cht lng hn. nh tng hp ny c th c dng trong cc h thng nhn dng, xc nh v theo vt chuyn ng, v h thng ny c th c xem nh th gic ca robot.

BUILDING A GOOD IMAGE FROM TWO COLOR IMAGES OF CAMERA

MODEL USING GA AND DISCRETE WAVELET TRANSFORM

Pham The Bao, Pham Thanh Trung University of Natural Sciences, VNU-HCM

(Manuscript Received on November 18th, 2007, Manuscript Revised December2nd, 2007)

ABSTRACT: We set up a system to build a good image from two-camera model. Our system is imitated a human visual system with two cameras referring to two eyes; each eye captures its own view and two separate images are sent to brain for processing to unit into one image. Similarly, in our system, we present a process to find out the relationship of two images captured from two cameras, and then these images are synthesized to build a good image. This image can be applied in other processes such as object recognition, detection or trackingAnd our system can be used as robot vision.

Keywords: 2-cameras model, GA, discrete wavelet transform, robot, fusion.

PHT TRIN NG DNG GIS TRN PDA

Trn Trng c, V Minh Hi Trng i hc Bch khoa, HQG-HCM


TM TT: Vic tch hp cc phn mm GIS, GPS vi cc thit b truyn thng cm tay hnh thnh nn khi nim Mobile GIS. Bi bo ny trnh by nhng kt qu t c trong vic pht trin th nghim mt h Mobile GIS. H thng c pht trin theo m hnh 2 lp khch-ch (client-server). Trong ng dng pha client c xy dng trn thit b tr gip c nhn k thut s (Personal Digital Assistants PDA) s dng ngn ng lp trnh C#. Client v Server thc hin kt ni thng qua socket hng kt ni trn giao thc TCP/IP. C s d liu bn cho pha Server l SQL Server 2005 v cho pha PDA l SQL Mobile Database ca Microsoft. Cc chc nng chnh c pht trin bao gm hin th bn , tra cu, cp nht thng tin v c bit l cho php trao i d liu gia cc PDA v gia PDA vi Server.

DEVELOPING GIS APPLICATIONS ON PDA

Tran Trong Duc, Vo Minh Hai Univerrsity of Technology, VNU-HCM

ABSTRACT: The Integration of GIS software, GPS and mobile communication devices creates a Mobile GIS concept. This paper presents results achieved in developing a prototype Mobile GIS. The System was developed using client-server architecture. Application on client side was built on Personal Digital Assistants (PDA) based on programming language C#. Client and server connects through connection-oriented sockets using TCP/IP protocol. Map Database on Server side is SQL Server 2005 and on PDA side is SQL Mobile Database of Microsoft. Main functions include displaying Map, querying and updating map information and specially allowing data exchange between PDAs, or between PDA and Server.

NG DNG CNG NGH TO MU NHANH TO CHI TIT CY GHP S NO

Bi Anh Quc(1), ng Vn Nghn(1), L Tm Phc(1), Trn i Nguyn(1)

Hunh Hu Ngh(1), V Vn Nho(2), L in Nhi(3), Nguyn Ngc Thin(4)

(1) Trng i hc Bch khoa, HQG-HCM

(2) Bnh vin Ch Ry, (3) Bnh vin 115, (4) Bnh vin Nhn dn Gia nh (Bi nhn ngy 26 thng 01 nm 2006, hon chnh sa cha ngy 18 thng 10 nm 2008)

TM TT: No l mt phn qua trng ca con ngi nhng do mt nguyn nhn khch quan no ngi ta b mt i mt phn xng s bo v no. Nhm mc ch to li phn xng s b khuyt ca bnh nhn, chng ti nghin cu vic ti to chi tit cp ghp s no bng phng php to mu nhanh. Nghin cu ny c thc hin trn mt s bnh nhn v c kt qu rt kh quan.

APPLICATION OF RAPID PROTOTYPING IN BUILDING SKULL IMPLANT

Bui Anh Quoc(1), Dang Van Nghin(1), Le Tam Phuoc(1), Tran Dai Nguyen(1)

Huynh Huu Nghi(1), Vo Van Nho(2), Le Dien Nhi(3), Nguyen Ngoc Thien(4)

(1) University of Technology, VNU-HCM

(2) Cho Ray Hospital, (3) 115 Hospital, (4)Gia nh Hospital

ABSTRACT: Brain is an important part of human being but in case of some objective reason people lost a part of their skull to protect brain. In order of recreate the defect part for patient, we researched the recreation by rapid prototying method. This re search has been carried out in some patients with good results.

NGHIN CU CH TO CH PHM BIOCOFFEE-1 T ASPERGILLUS NIGER V NG DNG LN MEN CC LOI C PH

L Hng Ph(1), Nguyn c Lng(2), i Ngha(3) (1) Trng i hc Quc T, HQG -HCM

(2)Trng i hc Bch Khoa, HQG -HCM (3)Trng i hc Nng Lm Tp.HCM


TM TT: Trong ch bin c ph hin nay, vn tch chit hu ht cc cht ha tan c trong ht c ph c cc nh sn xut quan tm. Tuy nhin, qu trnh tch chit cc cht ha tan c trong ht c ph gp tr ngi do hai thnh phn pectin v cellulose chim ch yu trong ht c ph gy ra, pectin (52,62-55,14%), cellulose (15,29-17,04%). Chng ti ch to thnh cng ch phm biocoffee-1 cha hot tnh pectinase v cellulase cao vi thnh phn mi trng ti u l 9% c rt, 15% v tru v nhng thnh phn khc l 75% cm v 1% NH4(SO4)2 v cc yu t khc nh sau: iu kin nhit khong 27-300C (nhit phng), m t 56-64%W v thi gian t 40-44 gi. Qu trnh nhn ln ca ch phm, hai loi bt m v bt sn nhn thy l tt nht v t l tt nht l bt m: bt sn = 2:1, vi m 56% v thi gian 30 gi. Ngoi ra, chng ti xc nh cc iu kin ti u cho qu trnh ln men c ph l c ph nn ngm nc 1 gi v ro, ln men 16 gi v t l ch phm: trng lng c ph s dng l 16/1000. Ch phm ny va gii quyt hiu qu tr ngi c cp t u ng thi nng cao cht lng c ph bng cng ngh ln men, mt hng mi trong ch bin c ph hin nay.[3], [4], [5]

SYNTHESIZING BIOCOFFEE-1 AND APPLYING IT IN COFFEE FERMENTATION

Le Hong Phu(1), Nguyen Duc Luong(2), Do Dai Nghia(3) (1)International University, VNU-HCM

(2) University of Technology, VNU-HCM (3) Nong lam University of HCMc

ABSTRACT: In coffee processing today, attracting all the dissolved substances from the coffee bean is a matter that so many manufacturers are interested in. However, the dissolved substrate extraction is recognized by the two major components in the coffee bean: pectine and cellulose as from this research. Pectine contains 52.62-55.14% and cellulose contains 15.29-17.04%. We have successfully created the bio-product named Biocoffee-1, which has high enzymatic activity of pectinase and cellulase. The optimal chemical components of culture for this bio-product synthesis includes carrot (9 %), rice husk (15%), mash (75%), NH4(SO4)2 (1%) and other factors such as temperature 27-300C (about room temperature), humidity 56-64%W, and time 40-44 hours. On a large scale, when the bio-product is needed for industrial production, it also needs to produce a larger quantity as well. We find that the wheat powder and cassava are the most appropriate for this process. We concluded that the ratio wheat powder: cassava powder is 2:1, humidity 56 %W and bio-synthesis time is optimal at 30 hours. Moreover, we also investigated the optimal fermented conditions for the highest quantity of dissolved substance weight. The dissolved substance weight is defined that the dry quantity of dissolved substance extracted from 10g of fermented coffee and dissolved rate is done by putting 10g of coffee powder in 50ml of hot water. We concluded that coffee-bean humidity gets most after 3 hours in water. However; the highest quantity of dissolved substances weight was determined 1 hour after putting coffee in water, and the optimal fermented time was 16 hours and the ratio bio-product weight/ coffee weight is16/1000. Thus, this bio-product can solve the problem as early mentioned and get the high quality of coffee with the fermented method, a new way in coffee processing today.

LN MEN CN BNG NM MEN C NH TRONG TRONG CC MI TRNG C NNG GLUCOSE BAN U KHC NHAU

Bi Thanh Huyn, L Vn Vit Mn Trng i hc Bch Khoa, HQG-HCM

TM TT: Trong nghin cu ny, chng ti kho st s sinh trng v hot tnh ca nm men Saccharomyces cerevisiae c nh trong gel alginate trong qu trnh ln men cn vi nng glucose ban u ca mi trng tng dn. Khi tng nng glucose ban u t 140 g/L ln 200 g/L, chng ti nhn thy s thay i nng glucose khng nh hng ng k n s sinh trng cng nh hot tnh ca nm men c nh. Trong cng iu kin th nghim, qu trnh ln men bng nm men c nh lun cho lng sinh khi cc i, tc ln men v nng cn cui cao hn qu trnh ln men vi nm men t do. Trong mi trng c nng glucose ban u l 220 g/L, nm men c nh to c nng cn cui rt cao (khong 10.4-11.7% v/v). C th kt lun rng nm men c nh trong gel alginate t mn cm vi p sut thm thu cng nh nng cn cao ca mi trng. V vy, s dng nm men c nh trong sn xut cn t mi trng c nng cht kh ban u cao l mt phng php hiu qu nng cao sn lng cn.

ALCOHOLIC FERMENTATION WITH DIFFERENT INITIAL GLUCOSE CONCENTRATION USING IMMOBILIZED YEAST IN CALCIUM

ALGINATE GEL

Bui Thanh Huyen, Le Van Viet Man University of Technology, VNU-HCM

(Manuscript Received on April 04th, 2007, Manuscript Revised March 04th, 2009)

ABSTRACT: In this research, the growth and metabolic activities of Saccharomyces cerevisiae immobilized in alginate gel during alcoholic fermentation with different initial

glucose concentration were studied. Starting from initial glucose concentration at 140 g/L, we observed that increasing this concentration to 220 g/L had little effect on the growth of immobilized yeast. Under the same conditions, the maximum biomass, glucose uptake rate, and final ethanol concentration obtained in the immobilized yeast cultures were always higher than those in the free yeast cultures. In 220 g glucose/L medium, the final ethanol concentration produced by immobilized yeast was very high (about 10.4-11.7% v/v). It can be concluded that immobilized yeast were less sensitive to high osmotic pressure and high ethanol concentration in medium than free yeast. Therefore, using immobilized yeast in alcoholic fermentation is potential to enhance ethanol productivity.

NH HNG HM LNG TANNIN BAN U TRONG DCH NHO N NG HC QU TRNH LN MEN RU VANG, S DNG NM MEN C

NH TRONG GEL ALGINATE

Tn N Minh Nguyt, Nguyn Th Hin Lng, L Ngc Liu, L Vn Vit Mn Trng i hc Bch khoa, HQG-HCM

TM TT: Bi bo ny kho st s nh hng ca nng tannin ban u trong dch nho (1.8, 2.8, 3.8, 9.8 v 17.8g acid tannic/L) n ng hc qu trnh ln men ru vang , s dng nm men c nh trong gel alginate calcium. Kt qu thc nghim cho thy trong mi trng vi hm lng tannin cao (9.8 v 17.8g acid tannic/L), gi tr mt t bo cc i v tc sinh trng ring cc i ca nm men c nh cao hn so vi nm men t do. Trong tt c cc trng hp kho st, tc s dng ng v tc sinh tng hp ethanol ca nm men c nh lun cao hn so vi nm men t do. Ngoi ra, vic s dng nm men c nh cn lm gim gi tr pH v hm lng cc acid d bay hi trong ru vang. Do , bn keo, bn sinh hc v gi tr cm quan ca ru vang thnh phm s c ci thin.

INFLUENCE OF INITIAL TANNIN CONCENTRATION IN MUST ON THE KINETICS OF WINE FERMENTATION, USING YEAST

IMMOBILIZED IN CALCIUM ALGINATE GEL

Ton Nu Minh Nguyet, Nguyen Thi Hien Luong, Le Ngoc Lieu, Le Van Viet Man University of Technology, VNU-HCM

(Manuscript Received on June 10th, 2007, Manuscript Revised April 29th, 2008)

ABSTRACT: This study investigated the effects of five initial tannin contents (1.8, 2.8, 3.8, 9.8 and 17.8g of acid tannic/L) on the kinetics of red wine fermentation, using yeast immobilized in calcium alginate gel. Our experimental results showed that in the medium with high tannin content (9.8 and 17.8g of acid tannic/L), maximum cell density and maximum specific growth rate of the immobilized cells were higher than those of the free cells. In all cases, the glucose utilization rate and ethanol production rate of the immobilized yeast were always higher than those of the free yeast. Moreover, using immobilized yeast in wine fermentation decreased pH value and volatile acidity of the culture. Thus the colloidal and biological stability and the organoleptic characteristics of the final product were ameliorated.

Keywords: alginate, fermentation, immobilization, tannin, wine.

NGHIN CU PHNG PHP XC NH T L NC NG BNG V NHIT LNH NG THCH HP CA VT LIU M GIAI ON 1

TRONG SY THNG HOA

Nguyn Tn Dng (1), Trnh Vn Dng (2), Trn c Ba (3) (1)Trng i hc S phm K thut Tp.HCM, (2) Trng i hc Bch Khoa, HQG-HCM

(3) Trng i hc Cng Nghip Tp.HCM (Bi nhn ngy 12 thng 05 nm 2008, hon chnh sa cha ngy 07 thng 08 nm 2008)

TM TT: Sy thng hoa l mt qu trnh k thut kh phc tp bao gm ba giai on: giai on 1: lm lnh ng vt liu m (VLA) chuyn ton b m t do trong VLA t trng thi lng sang trng thi rn; giai on 2: sy thng hoa to ra mi trng sy c nhit v p sut thp nh hn trng thi ba th (0.00980C; 4.58mmHg) m trong vt liu t trng thi rn thng hoa sang trng thi hi, kt thc giai on ny m ng bng trong vt liu sy thng hoa hon ton, nhit vt liu sy 0.00980C; giai on 3: sy chn khng lm bay hi m lin kt trng thi lng cn li trong vt liu sy, kt thc giai on ny khi c s cn bng nhit xy ra. Vi 1 qu trnh tri qua 3 giai on nh vy th vic xc nh ch cng ngh gp rt nhiu kh khn v phc tp. bi vit ny, chng ti nghin cu phng php xc nh nhit lnh ng thch hp ca VLA thng qua vic xc nh t l nc ng bng trong VLA (nhm gip xc: tm s, tm bc, tm th) theo nhit lnh ng ca chng, kt qu thu c gp phn gii quyt bi ton lnh ng giai on 1 trong sy thng hoa, ng thi lm c s khoa hc cho vic xc nh ch cng ngh sy thng hoa cc sn phm thc phm cao cp ni chung v thu sn hi nhm gip xc c gi tr kinh t ni ring.

RESEARCHED THE METHOD TO DETERMINE ICE RATIO IN MATERIALS FREEZE AND OPTIMAL TEMPERATURE OF FREEZE IN

STAGE 1 OF PROCESSING FREEZE - DRYING

Nguyen Tan Dung(1), Trinh Van Dung(2), Tran Duc Ba(3) (1)University Technical Education Ho Chi Minh City

(2)University of Technology, VNU-HCM (3)University of Industry Ho Chi Minh City

ABSTRACT: In the fact that Stage 1 freeze humidity materials of processing Freeze Drying will be the most effect, when temperature of materials comes up to the optimal temperature of freeze, at that time free water of materials will be completely crystallized, therefore when finshed on stage 2 of processing Freeze Drying free humidity of materials be crystallized to completely sublimated. Like this, how to determine free water of materials completely crystallized and optimal temperature of freeze in stage 1 of processing Freeze Drying. For this reason, We researched the method to determine the ice ratio and optimal temperature in stage 1 freeze of processing freeze - Drying.

TNH TON DNG CHY TRONG SNG RCH CN GI BNG M HNH TON S 2 CHIU

L Song Giang, Trn Th Ngc Triu Trng i hc Bch khoa, HQG-HM


TM TT: Bi bo trnh by vic tnh ton dng chy trong mng sng rch Cn Gi bng m hnh ton s hai chiu. M hnh c thit lp da trn vic gii phng trnh Saint Venant 2 chiu theo phng php th tch hu hn trn li phi cu trc. Kim tra vi cc bi ton mu cho thy m hnh c chnh xc kh cao. Kt qu tnh dng chy trong sng rch Cn Gi cng rt khp vi cc s liu o. Ngoi ra kt qu tnh cn cho thy mt s c trng ca dng chy khu vc ny.

Keywords: finite volume method; shallow-water equations; unstructured grid

NUMERICAL CALCULATION OF FLOW IN RIVES AT CAN-GIO USING TWO-DIMENSIONAL NUMERICAL MODEL

Le Song Giang, Tran Thi Ngoc Trieu University of Technology, VNU-HCM

ABSTRACT: This paper presents the calculation of flow in the river network of Can Gio using 2D numerical model. This model is based on solving 2D Saint Venant equations by finite volume method on unstructured grid. The test with benchmarks showed that the model

has a high accuracy. Computational results of flow in Can Gio were also in good agreement with field data. In addition, the calculation represented several specific characteristics of flow in this region.

NG HA S LIU BNG PHNG PHP BIN PHN BN CHIU TRONG D BO THI TIT BNG PHNG PHP S TR

Hunh Th Hng Ng, La Th Cang Trng i hc Khoa Hc T Nhin, HQG HCM


TM TT: ng ha s liu trong d bo thi tit bng phng php s tr l mt quy trnh phc tp v nh hng rt ln n cht lng d bo. Trong quy trnh ny cc s liu quan trc c kt hp vi kt qu d bo ngn hn trc y ca m hnh to ra iu kin ban u cho mt phin d bo mi.

Bi bo gii thiu: k thut ng ha bin phn bn chiu (4D-Var), l phng php ng ha s liu tin tin nht hin nay; xem xt kh nng p dng ng ha s liu trong d bo thi tit bng cc m hnh s tr v hng pht trin trong tng lai ca k thut ny Vit Nam.

T kha: ng ha bin phn bn chiu, d bo thi tit bng s ton.

FOUR-DIMENSIONAL VARIATIONAL DATA ASSIMILATION IN NUMERICAL WEATHER PREDICTION

Huynh Thi Hong Ngu, La Thi Cang University of Natural Sciences, VNU-HCM

ABSTRACT: Data assimilation is a very complicated cycle in numerical weather prediction and influences the quality of forecast. In this technique, the observered meteorological data are combined with the results of previous short-range forecast of the model to make an initial condition for a new prediction.

This paper presents: four-dimensional variational assimilation (4D-Var), the most advanced technique for the data assimilation; the application of data assimilation in numerical weather prediction in Vietnam at present and the development of this technique in future. Key words: Four-dimensional variational assimilation, numerical weather prediction C IM THCH HC, THCH A HA GRANITOID VNG NI HN

THNG V CHU VIN, LONG HI, B RA -VNG TU

Phm Quang Vinh, Trn Ph Hng Trng i hc Khoa hc T nhin, HQG-HCM


TM TT: Khu vc nghin cu nm vng Long Hi, tnh B Ra - Vng Tu. Thnh phn thch hc gm granit biotit ht va, granit biotit ht nh. mch gm granit aplit, aplit v pegmatoit. Thnh phn khong vt chnh l plagioclas, feldspat kali, thch anh, biotit v t hornblend. Khong vt ph thng gp l zircon, orthit, sphen, magnetit. Hu ht cc b bin i hu magma mnh m, ch yu l cc qu trnh albit ha v microclin ha. Cc c hm lng SiO2 = 72.68 - 76.06%, Al2O3 = 12.06 - 13.70%, Na2O = 3.24 - 4.06%, K2O = 4.18 - 5.12%. Cc nguyn t vt thng gp l Sn, W, Mo, Cu, Pb, Zr, Hf, Y, Yb.

PETROGRAPHICAL, PETROCHEMICAL CHARACTERISTICS OF

GRANITOIDS IN HON THUNG AND CHAU VIEN MOUNTAINS, LONG HI AREA, BA RIA-VUNG TAU PROVINCE

Pham Quang Vinh, Tran Phu Hung University of Natural Sciences, VNU-HCM

ABSTRACT: The study area is located at Long Hai, Ba Ria-Vung Tau province. The petrographical components consist of medium to small - grained biotite granite. The vein rocks are inclusive of aplite, aplitic granite and pegmatoid. The main mineral components are plagioclase, potassium feldspar, quartz, biotite and little hornblende. The common accessory minerals are sphene, zircon, apatite, orthite and magnetite. Most of the rocks are subjected to intensive post-magmatic alteration, mainly albitization and microlinization proccesses. In the rocks there is SiO2 = 72.68 - 76.06%, Al2O3 = 12.06 - 13.70%, Na2O = 3.24 - 4.06%, K2O = 4.18 - 5.12%. The common trace elements are Sn, W, Mo, Cu, Pb, Zr, Hf, Y, Yb.

NH GI HIU QU CA H CN MA ST BIN THIN VI CNG TRNH CHU TI TRNG NG T

Phm Nhn Ha(1), Chu Quc Thng(2) (1)Chng trnh EMMC,(2)Trng i hc Quc T, HQG-HCM

(Bi nhn ngy10 thng 01 nm 2007, hon chnh sa cha ngy 05 thng 05 nm 2008)

TM TT: S b sung ca h cn ma st bin thin (VFD-Variable Friction Damper) i vi s gim dao ng cho cng trnh chu ti trng ng t thng i hi thut ton iu khin bn ch ng tht hiu qu. Chnh v vy, bi bo a ra thut ton iu khin h cn ma st bin thin trong m hnh khng gian trng thi, thut ton ny cp n vic xc nh lc ma st bin thin thng qua lc kp bin thin. Cc v d so snh s hiu qu gia h cn ma st c iu khin b ng v h cn ma st bin thin c iu khin bn ch ng c a ra trong phn v d s, cc kt lun s b v cc u v khuyt im ca vic s dng h cn ma st bin thin cng c a ra cui bi bo.

ASSESSMENT OF THE EFFICIENCY OF VARIABLE FRICTION DAMPER FOR SEISMIC PROTECTION OF BUILDING

Chu Quoc Thang(1), Pham Nhan Hoa(2) (1) International University, VNU-HCM

(2)EMMC Programme

ABSTRACT: The implementation of variable friction dampers (VFD) for vibration mitigation of seismic structures generally requires an efficient semi-active control method. In this paper, a semi-active model control method is proposed to determine the controllable clamping force of a variable friction damper. A comparative study was performed on a multiple DOF structure controlled by passive friction dampers, variable friction dampers in subsection numerical examples. Finally, this paper also provides preliminary conclusions of the advantages and disadvantages for friction dissipators.

NG DNG K THUT INSAR VI PHN TRONG QUAN TRC BIN DNG MT T KHU VC THNH PH H CH MINH

L Vn Trung, H Tng Minh nh Trng i Hc Bch Khoa, HQG-HCM


TM TT: S gim mc nc cc tng khai thc nc di t, cng vi s pht trin nhanh cc cng trnh xy dng trn mt t,... v ang gy nn s bin dng b mt a hnh (ln t) xy ra ti nhiu ni trong khu vc TP.HCM. Cc bin dng ny th hin qua cc hin tng mt t xung quanh cc ging khoan b h thp lm tri ng chng cc ging khoan ti nhiu im kho st trn a bn thnh ph.

Mc d cc phng php thy chun chnh xc v k thut GPS cho php cung cp cc tr o chnh xc bin dng mt t, nhng i hi tn km nhiu v chi ph v thi gian. Bi bo nhm minh chng cho kh nng ng dng hiu qu cng ngh v tr trong vic pht hin s bin dng ln mt t. Kt qu nghin cu ban u cho thy b mt a hnh TP. HCM b ln ng bo ng v k thut InSAR vi phn l mt gii php kh thi nht trong vic pht hin cc bin dng b mt a hnh theo khng gian v thi gian.

MEASURING GROUND SUBSIDENCE IN HO CHI MINH CITY USING DIFFERENTIAL INSAR TECHNIQUES

Le Van Trung, Ho Tong Minh Dinh

University of Technology, VNU-HCM

ABSTRACT: The water table has been constantly lowering and the urbanization has been rapidly developing during the last decades, due to the strong groundwater extraction has led to the subsidence of some areas in the Ho Ch Minh city. Land deformation at the rate of few centimetres per year can be measured at the heavy ground water pumping stations.

Most existing techniques for monitoring ground subsidence base on using methods of precise leveling, and more recently the GPS. These methods are generally expensive and inefficient for monitoring large areas. Besides, sparsely distributed data points are often insufficient to provide information on every localized ground subsidence.

Recent advances in the SAR interferometry, especially with the Differential SAR Interferometry is an appropriate satellite remote sensing technique to map subsidence in urban areas at high accuracy and low costs.

Results demonstrate the effectiveness of employing the PSInSAR technique for land subsidence monitoring in the Ho Chi Minh city, and this method has enabled a long-term study of vertical land movements using SAR images.

L Hng PhNguyn c Lng i NghaTM TT: Chng ti xy dng mt h thng cho php nhn c mt nh c cht lng tt t m hnh hai camera. M hnh ca chng ti da trn h thng th gic ca con ngi, vi hai camera nh hai mt ngi; mi mt s nhn mt nh ri truyn v no b tng hp thnh mt nh m cht lng s tt hn tng hnh nh ca tng mt. Chng ti trnh by mt qu trnh tm mi tng quan ca hai nh c ly t hai camera, da vo mi tng quan ny chng ti tng hp mt nh mi c cht lng hn. nh tng hp ny c th c dng trong cc h thng nhn dng, xc nh v theo vt chuyn ng, v h thng ny c th c xem nh th gic ca robot.Trng i Hc Bch Khoa, HQG-HCM

Documents

12-2008