Correction for ‘pH-Triggered construction of NLO active CMOFs: change in supramolecular assembly,... more Correction for ‘pH-Triggered construction of NLO active CMOFs: change in supramolecular assembly, water clusters, helical architectures and their properties’ by Rajat Saha et al., CrystEngComm, 2011, 13, 1018–1028.
Bangladesh has clearly entered into demographic transition even with its relatively poor socioeco... more Bangladesh has clearly entered into demographic transition even with its relatively poor socioeconomic conditions. Total fertility rate (TFR) has declined from 7.0 in the early 1970s to about 3.5 in 2000 and under-five mortality has declined from about 250 in the early 1970s to nearly 75 in the 2000. There is some evidence of moderate decline of adult mortality, particularly of women of child-bearing age probably related to reduced burden of childbearing. Very little is known about socio-economic differentials and causes of death of elderly population (60 years or over) of the country. It is important to know the survival of old-age people because of many reasons. Bangladesh society is experiencing ideational changes of family formation, family relationship, kinship structure, and many others. Old people depend on their adult children, particularly sons for old-age support and security, as there is no public system of social security. Increased migration of work force, changes in fa...
International Journal of Information Technology and Computer Science
In recent years, with the advancement of the internet, social media is a promising platform to ex... more In recent years, with the advancement of the internet, social media is a promising platform to explore what going on around the world, sharing opinions and personal development. Now, Sentiment analysis, also known as text mining is widely used in the data science sector. It is an analysis of textual data that describes subjective information available in the source and allows an organization to identify the thoughts and feelings of their brand or goods or services while monitoring conversations and reviews online. Sentiment analysis of Twitter data is a very popular research work nowadays. Twitter is that kind of social media where many users express their opinion and feelings through small tweets and different machine learning classifier algorithms can be used to analyze those tweets. In this paper, some selected machine learning classifier algorithms were applied on crawled Twitter data after applying different types of preprocessors and encoding techniques, which ended up with sa...
Abstract This paper reports the development and performance of a tritium gas target with special ... more Abstract This paper reports the development and performance of a tritium gas target with special reference to the safety aspects. The target, 30 mm long and 20 mm in diameter, uses two pairs of windows cooled by helium gas circulated in a closed loop. The target can tolerate a 10.2 MeV proton beam of 15 μA at a gas pressure of 3 atm. The target has been extensively used with the Nuffield Cyclotron of the department for fast-neutron activation analysis.
Acta Crystallographica Section C Crystal Structure Communications
F(000)=944.0, T=293 K, R=0.041 for 2854 observed reflections with I_> 3tr(I). The title compound,... more F(000)=944.0, T=293 K, R=0.041 for 2854 observed reflections with I_> 3tr(I). The title compound, obtained as a racemate, can be considered as a structural analogue of trimetoquinol, a therapeutic agent which displays various effects in relation to its configuration. It seems then important to specify the
A binuclear manganese(III) complex [Mn2(L1)(N3)6] (2) and an unprecedented 1D chain of manganese(... more A binuclear manganese(III) complex [Mn2(L1)(N3)6] (2) and an unprecedented 1D chain of manganese(II) binuclear units bridged by two end-to-end thiocyanato anions {[Mn2II(L1)(NCS)4]·2CH3CN}n (3·2CH3CN) have been prepared from N-(1-pyridin-2-ylbenzylidene)-N′-[2-({2-[(1-pyridin-2-ylbenzylidene)amino]ethyl}amino)ethyl]ethane-1,2-diamine (L), manganese(II) salts and azide/thiocyanate anions in air. L1, N-(1-pyridin-2-ylbenzylidene)-N-[2-(4-{2-[(1-pyridin-2-ylbenzylidene)amino]ethyl}piperazin-1-yl)ethyl]amine, results from an alkylating cyclization of the flexible hexadentate Schiff base L occurring along the course of the complexation reactions. Both complexes
Two new dicyanamido-bridged polymeric complexes of manganese(II), [Mn(dca) 2 (pic) 2 ] n 1 and [M... more Two new dicyanamido-bridged polymeric complexes of manganese(II), [Mn(dca) 2 (pic) 2 ] n 1 and [Mn(dca) 2 (biim)] n 2 (dca = dicyanamide, pic = 4-picoline, biim = 2,2'-biimidazole), have been synthesized and characterized by X-ray single-crystal structure. Complex 1 forms a one-dimensional chain where [Mn(II)(pic) 2 ] units are connected by double dca bridging ligands. These ID chains interact through face-to-face π stacking of the 4-picoline pyridine rings extending the dimensionality to a 2D supramolecular network. In complex 2 [Mn(II)(dca)(biim)] units are connected by a single dca bridging ligand to form a ID chain of five coordinated Mn(II). The pentacoordination of Mn(II) is achieved by the bifurcated H-bond occurring between the terminal N atom of pendant dca and the two NH fragments of ligated 2,2'-biimidazole. These chains are interlocked by cooperative hydrogen bonding and π-π interactions to generate (4,4) nets, which are 2-fold interpenetrated to form an interwoven 2D sheet. The variable temperature magnetic susceptibility measurements were performed, and the study reveals an antiferromagnetic interaction between the metal centers.
Journal of Health Population and Nutrition, Sep 5, 2011
Two hundred and ninety-three randomly-selected members of the staff of ICDDR,B: Centre for Health... more Two hundred and ninety-three randomly-selected members of the staff of ICDDR,B: Centre for Health and Population Research were surveyed anonymously in June 1998, using a pre-tested and selfadministered questionnaire, to assess their knowledge on, and attitude toward, human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS). All except 4 (1.4%) heard of AIDS. Main sources of information were radio and television (93%), newspapers and magazines (84.8%), posters and leaflets (70.2%), and friends (59.2%). About 94% of the respondents believed that HIV might spread in Bangladesh. Only 61.6% knew about the causative agent for AIDS. More than 96% had knowledge that HIV could be detected through blood test. The respondents were aware that unprotected sexual intercourse (92%), transfusion of blood and blood components (93.8%), sharing unsterile needles for injections (94.1%), and delivery of babies by infected mothers (82.7%) could transmit HIV. Similarly, the respondents had the knowledge that HIV infection could be prevented by using condom during sexual intercourse (85.5%), having sex only with an HIVnegative faithful partner (87.2%), avoiding transfusion of blood not screened for HIV (88.9%), and taking injections with sterile needles (86.5%). However, only 33.0% had the knowledge that HIVinfected persons can look healthy, and 56.4% were unaware of transmission through breastmilk. Most members of the staff, particularly at lower level, had misconceptions about transmission and prevention of HIV/AIDS. More than 40% of the respondents had the attitude that HIV-infected persons should not be allowed to work, while another 10% did not have any idea about it. The findings of the study suggest that the members of the Centre's staff have a satisfactory level of essential knowledge on HIV/AIDS, although half of them have poor attitudes toward persons with HIV/AIDS. Therefore, preventive strategy for the staff should be directed toward behaviour change communication.
International business continues to grow rapidly and is playing an even more active political, so... more International business continues to grow rapidly and is playing an even more active political, social and corporate role, while at the same time it faces emerging risks and threats, emanating both from state and non-state actors alike such as, terrorism, fundamentalism, renewed East-West conflicts, rifts and policy divisions among allies, along with security concerns of states as a result of the free flow of information and communication. The new challenges are different from the old ones and many businesses are having difficulties in coping with them. This article is an attempt to study and analyze the root causes and sources of these threats, their nature, characteristics and dynamics as well as the impact and implications all this will have on international business.
A proposed two equation turbulence model for incompressible dilute two phase flows was validated ... more A proposed two equation turbulence model for incompressible dilute two phase flows was validated and extended for steady incompressible two phase flow including phase change. The model was tested for the flow of a turbulent axisymmetric gaseous jet laden with multisize evaporating liquid droplets. Predicted results include distributions of the mean velocity; volume fractions of different phases concentration of the
The hetero-tris-chelates of the formulae [Ru(phen)(RaaiR?) 2 ](ClO 4) 2 [phen 0/1,10-phenanthroli... more The hetero-tris-chelates of the formulae [Ru(phen)(RaaiR?) 2 ](ClO 4) 2 [phen 0/1,10-phenanthroline, RaaiR?0/1-alkyl-2-(arylazo)imidazole, p-RÃ/C 6 H 4 Ã/N Ä/N Ã/C 3 H 2 Ã/NN-1-R?, where R 0/H (a), Me (b), Cl (c) and R?0/Me (2), Et (3), CH 2 Ph (4)] have been isolated from the reaction of ctc-[RuCl 2 (RaaiR?) 2 ] with AgNO 3 '/phen or [Ag(phen) 2 ](ClO 4) in acetone at 40 8C in the dark followed by the addition of NaClO 4 (aq). The structure of [Ru(phen)(HaaiMe) 2 ](ClO 4) 2 has been confirmed by X-ray diffraction study and suggested stereoretentive nucleophilic substitution. The structure and stereochemistry of the complexes have been supported by 1 H NMR data. Electronic spectra exhibit a strong metal-to-ligand charge transfer (MLCT) band at 515 Á/530 nm along with a weak transition at 700 Á/710 nm. Cyclic voltammograms show a Ru(III)/Ru(II) couple at 1.3 Á/1.4 V versus saturated calomel electrode (SCE) along with three successive ligand reductions. The plot of the difference in potential of the first oxidation and reduction versus energy of the main MLCT band (/n/ CT) is linear.
ABSTRACT Reaction of AgNO3 and 1-alkyl-2-(naphthyl-(α/β)-azo)imidazole (α-/β-NaiR) in MeOH follow... more ABSTRACT Reaction of AgNO3 and 1-alkyl-2-(naphthyl-(α/β)-azo)imidazole (α-/β-NaiR) in MeOH followed by the addition of NaClO4 has isolated [Ag(α-/β-NaiR)2](ClO4) (3/4). The complexes are characterized by microanalytical and spectral data. Single crystal X-ray diffraction study of bis-[1-ethyl-2-(naphthyl-α-azo)imidazole]silver(I) perchlorate confirms the structure of the complex. Argentophilicity of imidazole-N and steric crowding by naphthyl groups have forced a {2+2} distorted linear geometry. The structure shows intramolecular and intermolecular H-bonding in a 1D helical framework along with face-to-face π–π interactions.
Acta Crystallographica Section C Crystal Structure Communications, 2000
The title complex, poly[bis[N-(2-aminoethyl)-N-methyl-1,2-ethanediamine]hexa-μ-thiocyanato... more The title complex, poly[bis[N-(2-aminoethyl)-N-methyl-1,2-ethanediamine]hexa-μ-thiocyanato-tricadmium(II) monohydrate], [Cd3(NCS)6(medien)2]n·nH2O [medien is N,N-bis(2-aminoethyl)methylamine, C5H16N3], adopts a three-dimensional inorganic polymeric network structure. Two cadmium centres (Cd1 and Cd2) are linked to each other via thiocyanate bridges. The environment of the Cd1 atom involves only S atoms, making it soft, whereas the environment of the Cd2 atom involves only N atoms, making it hard.
Correction for ‘pH-Triggered construction of NLO active CMOFs: change in supramolecular assembly,... more Correction for ‘pH-Triggered construction of NLO active CMOFs: change in supramolecular assembly, water clusters, helical architectures and their properties’ by Rajat Saha et al., CrystEngComm, 2011, 13, 1018–1028.
Bangladesh has clearly entered into demographic transition even with its relatively poor socioeco... more Bangladesh has clearly entered into demographic transition even with its relatively poor socioeconomic conditions. Total fertility rate (TFR) has declined from 7.0 in the early 1970s to about 3.5 in 2000 and under-five mortality has declined from about 250 in the early 1970s to nearly 75 in the 2000. There is some evidence of moderate decline of adult mortality, particularly of women of child-bearing age probably related to reduced burden of childbearing. Very little is known about socio-economic differentials and causes of death of elderly population (60 years or over) of the country. It is important to know the survival of old-age people because of many reasons. Bangladesh society is experiencing ideational changes of family formation, family relationship, kinship structure, and many others. Old people depend on their adult children, particularly sons for old-age support and security, as there is no public system of social security. Increased migration of work force, changes in fa...
International Journal of Information Technology and Computer Science
In recent years, with the advancement of the internet, social media is a promising platform to ex... more In recent years, with the advancement of the internet, social media is a promising platform to explore what going on around the world, sharing opinions and personal development. Now, Sentiment analysis, also known as text mining is widely used in the data science sector. It is an analysis of textual data that describes subjective information available in the source and allows an organization to identify the thoughts and feelings of their brand or goods or services while monitoring conversations and reviews online. Sentiment analysis of Twitter data is a very popular research work nowadays. Twitter is that kind of social media where many users express their opinion and feelings through small tweets and different machine learning classifier algorithms can be used to analyze those tweets. In this paper, some selected machine learning classifier algorithms were applied on crawled Twitter data after applying different types of preprocessors and encoding techniques, which ended up with sa...
Abstract This paper reports the development and performance of a tritium gas target with special ... more Abstract This paper reports the development and performance of a tritium gas target with special reference to the safety aspects. The target, 30 mm long and 20 mm in diameter, uses two pairs of windows cooled by helium gas circulated in a closed loop. The target can tolerate a 10.2 MeV proton beam of 15 μA at a gas pressure of 3 atm. The target has been extensively used with the Nuffield Cyclotron of the department for fast-neutron activation analysis.
Acta Crystallographica Section C Crystal Structure Communications
F(000)=944.0, T=293 K, R=0.041 for 2854 observed reflections with I_> 3tr(I). The title compound,... more F(000)=944.0, T=293 K, R=0.041 for 2854 observed reflections with I_> 3tr(I). The title compound, obtained as a racemate, can be considered as a structural analogue of trimetoquinol, a therapeutic agent which displays various effects in relation to its configuration. It seems then important to specify the
A binuclear manganese(III) complex [Mn2(L1)(N3)6] (2) and an unprecedented 1D chain of manganese(... more A binuclear manganese(III) complex [Mn2(L1)(N3)6] (2) and an unprecedented 1D chain of manganese(II) binuclear units bridged by two end-to-end thiocyanato anions {[Mn2II(L1)(NCS)4]·2CH3CN}n (3·2CH3CN) have been prepared from N-(1-pyridin-2-ylbenzylidene)-N′-[2-({2-[(1-pyridin-2-ylbenzylidene)amino]ethyl}amino)ethyl]ethane-1,2-diamine (L), manganese(II) salts and azide/thiocyanate anions in air. L1, N-(1-pyridin-2-ylbenzylidene)-N-[2-(4-{2-[(1-pyridin-2-ylbenzylidene)amino]ethyl}piperazin-1-yl)ethyl]amine, results from an alkylating cyclization of the flexible hexadentate Schiff base L occurring along the course of the complexation reactions. Both complexes
Two new dicyanamido-bridged polymeric complexes of manganese(II), [Mn(dca) 2 (pic) 2 ] n 1 and [M... more Two new dicyanamido-bridged polymeric complexes of manganese(II), [Mn(dca) 2 (pic) 2 ] n 1 and [Mn(dca) 2 (biim)] n 2 (dca = dicyanamide, pic = 4-picoline, biim = 2,2'-biimidazole), have been synthesized and characterized by X-ray single-crystal structure. Complex 1 forms a one-dimensional chain where [Mn(II)(pic) 2 ] units are connected by double dca bridging ligands. These ID chains interact through face-to-face π stacking of the 4-picoline pyridine rings extending the dimensionality to a 2D supramolecular network. In complex 2 [Mn(II)(dca)(biim)] units are connected by a single dca bridging ligand to form a ID chain of five coordinated Mn(II). The pentacoordination of Mn(II) is achieved by the bifurcated H-bond occurring between the terminal N atom of pendant dca and the two NH fragments of ligated 2,2'-biimidazole. These chains are interlocked by cooperative hydrogen bonding and π-π interactions to generate (4,4) nets, which are 2-fold interpenetrated to form an interwoven 2D sheet. The variable temperature magnetic susceptibility measurements were performed, and the study reveals an antiferromagnetic interaction between the metal centers.
Journal of Health Population and Nutrition, Sep 5, 2011
Two hundred and ninety-three randomly-selected members of the staff of ICDDR,B: Centre for Health... more Two hundred and ninety-three randomly-selected members of the staff of ICDDR,B: Centre for Health and Population Research were surveyed anonymously in June 1998, using a pre-tested and selfadministered questionnaire, to assess their knowledge on, and attitude toward, human immunodeficiency virus (HIV)/acquired immunodeficiency syndrome (AIDS). All except 4 (1.4%) heard of AIDS. Main sources of information were radio and television (93%), newspapers and magazines (84.8%), posters and leaflets (70.2%), and friends (59.2%). About 94% of the respondents believed that HIV might spread in Bangladesh. Only 61.6% knew about the causative agent for AIDS. More than 96% had knowledge that HIV could be detected through blood test. The respondents were aware that unprotected sexual intercourse (92%), transfusion of blood and blood components (93.8%), sharing unsterile needles for injections (94.1%), and delivery of babies by infected mothers (82.7%) could transmit HIV. Similarly, the respondents had the knowledge that HIV infection could be prevented by using condom during sexual intercourse (85.5%), having sex only with an HIVnegative faithful partner (87.2%), avoiding transfusion of blood not screened for HIV (88.9%), and taking injections with sterile needles (86.5%). However, only 33.0% had the knowledge that HIVinfected persons can look healthy, and 56.4% were unaware of transmission through breastmilk. Most members of the staff, particularly at lower level, had misconceptions about transmission and prevention of HIV/AIDS. More than 40% of the respondents had the attitude that HIV-infected persons should not be allowed to work, while another 10% did not have any idea about it. The findings of the study suggest that the members of the Centre's staff have a satisfactory level of essential knowledge on HIV/AIDS, although half of them have poor attitudes toward persons with HIV/AIDS. Therefore, preventive strategy for the staff should be directed toward behaviour change communication.
International business continues to grow rapidly and is playing an even more active political, so... more International business continues to grow rapidly and is playing an even more active political, social and corporate role, while at the same time it faces emerging risks and threats, emanating both from state and non-state actors alike such as, terrorism, fundamentalism, renewed East-West conflicts, rifts and policy divisions among allies, along with security concerns of states as a result of the free flow of information and communication. The new challenges are different from the old ones and many businesses are having difficulties in coping with them. This article is an attempt to study and analyze the root causes and sources of these threats, their nature, characteristics and dynamics as well as the impact and implications all this will have on international business.
A proposed two equation turbulence model for incompressible dilute two phase flows was validated ... more A proposed two equation turbulence model for incompressible dilute two phase flows was validated and extended for steady incompressible two phase flow including phase change. The model was tested for the flow of a turbulent axisymmetric gaseous jet laden with multisize evaporating liquid droplets. Predicted results include distributions of the mean velocity; volume fractions of different phases concentration of the
The hetero-tris-chelates of the formulae [Ru(phen)(RaaiR?) 2 ](ClO 4) 2 [phen 0/1,10-phenanthroli... more The hetero-tris-chelates of the formulae [Ru(phen)(RaaiR?) 2 ](ClO 4) 2 [phen 0/1,10-phenanthroline, RaaiR?0/1-alkyl-2-(arylazo)imidazole, p-RÃ/C 6 H 4 Ã/N Ä/N Ã/C 3 H 2 Ã/NN-1-R?, where R 0/H (a), Me (b), Cl (c) and R?0/Me (2), Et (3), CH 2 Ph (4)] have been isolated from the reaction of ctc-[RuCl 2 (RaaiR?) 2 ] with AgNO 3 '/phen or [Ag(phen) 2 ](ClO 4) in acetone at 40 8C in the dark followed by the addition of NaClO 4 (aq). The structure of [Ru(phen)(HaaiMe) 2 ](ClO 4) 2 has been confirmed by X-ray diffraction study and suggested stereoretentive nucleophilic substitution. The structure and stereochemistry of the complexes have been supported by 1 H NMR data. Electronic spectra exhibit a strong metal-to-ligand charge transfer (MLCT) band at 515 Á/530 nm along with a weak transition at 700 Á/710 nm. Cyclic voltammograms show a Ru(III)/Ru(II) couple at 1.3 Á/1.4 V versus saturated calomel electrode (SCE) along with three successive ligand reductions. The plot of the difference in potential of the first oxidation and reduction versus energy of the main MLCT band (/n/ CT) is linear.
ABSTRACT Reaction of AgNO3 and 1-alkyl-2-(naphthyl-(α/β)-azo)imidazole (α-/β-NaiR) in MeOH follow... more ABSTRACT Reaction of AgNO3 and 1-alkyl-2-(naphthyl-(α/β)-azo)imidazole (α-/β-NaiR) in MeOH followed by the addition of NaClO4 has isolated [Ag(α-/β-NaiR)2](ClO4) (3/4). The complexes are characterized by microanalytical and spectral data. Single crystal X-ray diffraction study of bis-[1-ethyl-2-(naphthyl-α-azo)imidazole]silver(I) perchlorate confirms the structure of the complex. Argentophilicity of imidazole-N and steric crowding by naphthyl groups have forced a {2+2} distorted linear geometry. The structure shows intramolecular and intermolecular H-bonding in a 1D helical framework along with face-to-face π–π interactions.
Acta Crystallographica Section C Crystal Structure Communications, 2000
The title complex, poly[bis[N-(2-aminoethyl)-N-methyl-1,2-ethanediamine]hexa-μ-thiocyanato... more The title complex, poly[bis[N-(2-aminoethyl)-N-methyl-1,2-ethanediamine]hexa-μ-thiocyanato-tricadmium(II) monohydrate], [Cd3(NCS)6(medien)2]n·nH2O [medien is N,N-bis(2-aminoethyl)methylamine, C5H16N3], adopts a three-dimensional inorganic polymeric network structure. Two cadmium centres (Cd1 and Cd2) are linked to each other via thiocyanate bridges. The environment of the Cd1 atom involves only S atoms, making it soft, whereas the environment of the Cd2 atom involves only N atoms, making it hard.
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