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Systematic study of rotational energy formulae for superdeformed bands in La and Ce isotopes

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Chinese Physics C 2017年第12期41卷 55-66页

作者： Honey Sharma H.M. Mittal dr. b.r. ambedkar national institute of technology Jalandhar 144011 India

The experimental rotational spectra of superdeformed（SD） bands of 130La, 131Ce（1,2）, 132Ce（1,2,3） and133 Ce（1,2,3） in the A～130 mass region are systematically analyzed with the four parameter formula, power index formula, nuclear softness formula, and VMI model. It is observed that out of all the formulae, the four parameter formula suits best for the study of the 130La, 131Ce（1,2）, 132Ce（2,3） and 133Ce（1,2,3） SD bands. The four parameter formula works efficiently in determining the band head spin of the 130La, 131Ce（1,2） 132Ce（2,3） and 133Ce（1,2,3） SD bands. Good agreement is seen between the calculated and observed transition energies whenever the accurate spin is assigned. In 132Ce（1）, the power index formula is found to work better than the other three formulae. The dynamic moment of inertia is also calculated for all the formulae and its variation with the rotational frequency is investigated.

关键词： superdeformed bands four parameter formula power index formula nuclear softness formula VMI model

Geo-environmental application of municipal solid waste incinerator ash stabilized with cement

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Journal of rock Mechanics and Geotechnical Engineering 2017年第2期9卷 370-375页

作者： Davinder Singh Arvind Kumar Department of Civil Engineering Dr. B.R. Ambedkar National Institute of TechnologyJalandharPunjabIndia

The behavior of soluble salts contained in the municipal solid waste incinerator(MSWI) ash significantly affects the strength development and hardening reaction when stabilized with *** present study focuses on the compaction and strength behavior of mixed specimens of cement and MSWI ash.A series of indices such as unconfined compressive strength,split tensile strength,California bearing ratio(Cbr) and pH value was *** to this,the specimens were cured for 7 d,14 d,and 28 *** test results depict that the maximum dr. density(MDD) decreases and the optimum moisture content(OMC)increases with the addition of *** test results also reveal that the cement increases the strength of the mixed ***,the combination of MSWI ash and cement can be used as a lightweight filling material in different structures like embankment and road construction.

关键词： Municipal solid waste incinerator(MSWI) ash Cement Compaction Stabilization California bearing ratio(Cbr) test Geotechnical properties

Systematic study of the product((E(2_2^+)/E(2_1^+)) * b(E2)↑) through the asymmetric rotor model

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Chinese Physics C 2016年第9期40卷 58-62页

作者： Parveen Kumari H.M.Mittal dr.b.r.ambedkar national institute of technology

A systematic study of the product（（E（22^＋）/E（21^＋））＊b（E2）↑） is carried out in the major shell space Z=50-82,N=82-126 within the framework of the asymmetric rotor model where the asymmetry parameter γ0reflects change in the nuclear structure.A systematic study of the product（（E（2^＋）/E（2^＋））＊b（E2）↑） with neutron numb.r.N is also *** product（（E（22^＋）/E（21^＋））＊b（E2）↑） provides a direct correlation with the asymmetry parameter γ*** effect of subshells is visible in ba-Gd nuclei with N 〉 82,but not in Hf-Pt nuclei with N 〉 *** study,for the first time,the dependency of the product（（E（22^＋）/E（21^＋））＊b（E2）↑） on the asymmetry parameterγ0.

关键词： nuclear structure asymmetric rotor model reduced electric quadr.pole transition probability

Magnetic moments of octet b.r.ons in hot and dense nuclear matter

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Chinese Physics C 2017年第9期41卷 108-122页

作者： Harpreet Singh Arvind Kumar Harleen Dahiya Department of Physics Dr. B R Ambedkar National Institute of Technology Jalandhar Jalandhar- 144011 Punjab India

We have calculated the in-medium magnetic moments of octet b.r.ons in the presence of hot and dense symmetric nuclear matter. Effective magnetic moments of b.r.ons have been derived from medium modified quark masses within the chiral SU（3） quark mean field model. Further, for better insight into the medium modification of b.r.onic magnetic moments, we have considered the explicit contributions from the valence quarks, sea quarks and the sea orbital angular momentum of sea quarks. These effects have been successful in giving the description of b.r.onic magnetic moments in vacuum. The magnetic moments of b.r.ons are found to vary significantly as a function of density of nuclear medium.

关键词： nuclear matter magnetic moments heavy ion collisions

Transition magnetic moments of J^P=3/2^+ decuplet to J^P=1/2^+ octet b.r.ons in the chiral constituent quark model

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Chinese Physics C 2018年第9期42卷 15-22页

作者： Harleen Dahiya Department of Physics Dr.B.R.Ambedkar National Institute of Technology

In light of the developments of the chiral constituent quark model（χ^（CQM）） in studying low energy hadr.nic matrix elements of the ground-state b.r.ons, we extend this model to investigate their transition *** magnetic moments of transitions from the J^P=3/2~＋ decuplet to J^P=1/2~＋ octet b.r.ons are calculated with explicit valence quark spin, sea quark spin and sea quark orbital angular momentum contributions. Since the experimental data is available for only a few transitions, we compare our results with the results of other available models. The implications of other complicated effects such as chiral symmetry breaking and SU（3） symmetry breaking arising due to confinement of quarks are also discussed.

关键词： b.r.on magnetic moments quark model chiral symmetries

Systematic dependence of SFE＊b(E2)↑ and rOTE＊b(E2)↑on N_pN_n in the framework of shape fluctuation model

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Chinese Physics C 2017年第5期41卷 116-121页

作者： Amit bindr. H.M.Mittal Department of Physics Dr.B.R.Ambedkar National Institute of Technology

A systematic dependence of shape fluctuation energy product SFE ＊ b（E2）↑ and rotational energy product rOTE ＊ b（E2）↑ on the valence nucleon product Np Nn is carried out in the Z = 50-82,N = 82-126 major shell *** the shape transitional nuclei,the product SFE＊b（E2）↑ dr.ps to zero and becomes negative,indicating direct dependence on N_pN_n.A relative rise,on the other hand,is observed in the product rOTE＊b（E2） ↑plotted against N_pN_n for all the nuclei in Z = 50-82 and N = *** the N 〉 104 region,large positive values of the product SFE ＊ b（E2） ↑ are observed for the Pt nucleus,which indicates sphericity.A systematic study of the product SFE ＊ b（E2）↑ and rOTE ＊ b（E2） ↑ with atomic numb.r.Z is also *** products SFE ＊ b（E2） ↑and rOTE ＊ b（E2） ↑ vary sharply with Z for the N = 88 *** discuss here for the first time the correlation between SFE ＊ b（E2） ↑ and rOTE ＊ b（E2） ↑ with valence nucleon product N_pN_n.

关键词： fluctuation nuclei E2 and rOTE*b nucleus rotational valence deformed transitional sharply

Mechanical properties and thermal conductivity of pristine and functionalized carbon nanotube reinforced metallic glass composites:A molecular dynamics approach

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Defence technology（防务技术） 2021年第1期17卷 234-244页

作者： Sumit Sharma S.K.Tiwari Sagar Shakya Department of Mechanical Engineering Dr.B.R.Ambedkar National Institute of TechnologyJalandharIndia

This work uses the molecular dynamics approach to study the effects of functionalization of carbon nanotubes(CNTs)on the mechanical properties of Cu64Zr36 metallic glass(MG).Three types of functional groups,carboxylic,vinyl and ester were *** effect of CNT volume fraction(Vf)and the numb.r.of functional groups attached to CNT,on the mechanical properties and thermal conductivity of CNT-MG composites was analysed using biovia Materials *** lower values of Vf(from 0 to 5%),the percentage increase in Young’s modulus was approximately 66%.As the value of Vf was increased further(from 5 to 12%),the rate of increase in Young’s modulus was reduced to 16%.The thermal conductivity was found to increase from 1.52 W/mK at Vf?0%to 5.88 W/mK at Vf?12%,thus giving an increase of approximately 286%.Functionalization of SWCNT reduced the thermal conductivity of the SWCNT-MG composites.

关键词： Molecular dynamics Carbon nanotube Metallic glass Mechanical properties Thermal conductivity

Development of mix design method based on statistical analysis of different factors for geopolymer concrete

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Frontiers of Structural and Civil Engineering 2022年第10期16卷 1315-1335页

作者： Paramveer SINGH Kanish KAPOOr Department of Civil Engineering Dr B R Ambedkar National Institute of TechnologyJalandhar 144011India

The present study proposes the mix design method of Fly Ash(FA)based geopolymer concrete using response Surface Methodology(rSM).In this method,different factors,including binder content,alkali/binder ratio,NS/NH ratio(sodium silicate/sodium hydr.xide),NH molarity,and water/solids ratio were considered for the mix design of geopolymer *** 2D contour plots were used to setup the mix design method to achieve the target compressive *** proposed mix design method of geopolymer concrete is divided into three categories based on curing regime,specifically one ambient curing(25°C)and two heat curing(60 and 90°C).The proposed mix design method of geopolymer concrete was validated through experimentation of M30,M50,and M70 concrete mixes at all curing *** observed experimental compressive strength results validate the mix design method by more than 90%of their target ***,the current study concluded that the required compressive strength can be achieved by varying any factor in the mix *** addition,the factor analysis revealed that the NS/NH ratio significantly affects the compressive strength of geopolymer concrete.

关键词： geopolymer concrete mix design fly ash response surface methodology compressive strength stress—strain

band head spin assignment of superdeformed bands in Hg isotopes through power index formula

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Chinese Physics C 2018年第5期42卷 79-84页

作者： Honey Sharma H.M.Mittal dr.b.r.ambedkar national institute of technology Jalandhar144011India

The power index formula has been used to obtain the band head spin(I0) of all the superdeformed(SD) bands in Hg isotopes. A least squares fitting approach is used. The root mean square deviations between the determined and the observed transition energies are calculated by extracting the model parameters using the power index formula. Whenever definite spins are available, the determined and the observed transition energies are in accordance with each other. The computed values of dynamic moment of inertia J~((2)) obtained by using the power index formula and its deviation with the rotational frequency is also studied. Excellent agreement is shown between the calculated and the experimental results for J~((2)) versus the rotational frequency. Hence, the power index formula works very well for all the SD bands in Hg isotopes expect for195Hg(2, 3, 4).

关键词： superdeformed bands power index formula