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Nonunion of coronal shear fracture of femoral condyle

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Chinese Journal of Traumatology 2011年第3期14卷 143-146页

作者： Ajay Pal Singh Ish Kumar Dhammi Raju Vaishya Anil Kumar Jain Arun Pal Singh Prashant Modi punjab civil medical services Mukerian Punjab India Department of Orthopedics UCMS & GTB Hospital Delhi India Department of Orthopedics and Traumatology Indraprastha Apollo Hospital Delhi India S.P.N. Hospital Mukerian Punjab India

Isolated coronal fractures of femoral condyle are rare in adults and nonunion of Hoffa fracture is reported only a few times in the literature. We analyzed six cases of nonunion of Hoffa fractures over a period of three years. Three patients were treated conservatively and three patients had fixation failures. Delay of presentation was 2 months to one year. Treatment protocol consisted of open reduction, excision of pseudoarthrosis, bone grafting and internal fixation along with knee arthrolysis. Union wasachieved in all patients at mean 16 weeks. The treatment of nonunion of Hoffa fractures requires careful preoperative planning and meticulous surgical technique. The literature regarding the controversies in fracture management and surgical technique are reviewed.

关键词： Femoral fracture Fracture ftxation internal Retrospective studies

Influence of anthropogenic activities on landslide susceptibility:A case study in Solan district,Himachal Pradesh,India

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Journal of Mountain Science 2023年第2期20卷 429-447页

作者： Sangeeta S.K.SINGH Department of civil Engineering Punjab Engineering CollegeChandigarh 16012India

Landslides in the Himalayan region are primarily controlled by natural parameters,including rainfall,seismic activity,and anthropogenic parameters,such as the construction of large-scale projects like road development,tunneling and hydroelectric power projects and climate *** parameters which are more crucial among these are a matter of scientific study and *** research,taking Solan district,Himachal Pradesh,India,as the study area,aims to assess the impact of anthropogenic activities on landslide susceptibility at a regional *** distribution was characterized into two groups,namely Rainfall-Induced Landslide(RIL)and Human-Induced Landslide(HIL)based on triggering *** data such as slope angle,aspect,profile curvature,distance to drainage,distance to lineament,lithology,distance to road,normalized difference vegetation index(NDVI)and land use land cover(LULC)have been considered for delineating the landslide susceptibility zonation(LSZ)*** effect of anthropogenic activities on landslide occurrences has been examined through the distribution of landslides along national highways and land use land cover changes(LULCC).Two sets of LSZ maps with a LULC of time interval covering five years(2017&2021)were prepared to compare the temporal progression of LULC and landslide susceptibility during the five *** results indicated the significant impact of anthropogenic activities on the landslide *** map of the year 2021 shows that 23%area falls into high and very high susceptible classes and 48%area falls into very low and low susceptibility *** to LSZ map of 2017,high and very high susceptible classes have been increased by 15%,whereas very low and low susceptible classes have been reduced by 7%.The present case study will help to understand the potential driving parameters responsible for HIL and also suggest the inclusion of LULC in landslide susceptibility *** study will demonstrate new

关键词： Landslide Anthropogenic Human-Induced Landslide(HIL) Rainfall-Induced Landslide(RIL)

Influence of rooftop telecommunication tower on set back-step back building resting on different ground slopes

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Earthquake Engineering and Engineering Vibration 2019年第2期18卷 351-362页

作者： Amit Thakur Deepankar Kumar Ashish Surender Kumar Verma civil Engineering Department Kurukshetra University civil Engineering Department Maharaja Agrasen Institute of Technology Maharaja Agrasen University civil Engineering Department Punjab Engineering College (Deemed to be University)

In the hilly region due to scarcity of the plain area, buildings like set back-step back are more often used and also as a big surge in the telecommunication industries, rooftop tower adaptation is very common story nowadays. In the present study an analogy has been drawn to find out the influence of the rooftop telecommunication tower on the setback-step back building resting on ground at 20° and 30° slopes. A dynamic analysis has been performed and compared on the 4 legged angled section telecommunication tower which is located on the roof top of set back-step back building by varying positions of tower with the existing host structure built up on ground slope of 20° and 30° in both directions(X and Y).

关键词： rooftop telecommunication tower set back-step back building response spectrum analysis steel, RC frame, earthquake SAP2000

Dynamic Behaviour of Pond Ash Mixed with Coir and Crumb Rubber

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Journal of Renewable Materials 2023年第3期11卷 1271-1291页

作者： Ashish Malik Sanjay Kumar Singh civil Engineering Department Punjab Engineering College(Deemed to be University)Chandigarh160012India

An experimental program was conducted to determine the dynamic properties of pond ash(PA)and pond ash mixed with admixtures like crumb rubber(CR)and coir fiber(CF)which are wastes of different *** CR and CF were mixed separately with pond ash in a percentage ranging from 0%–20%at an interval of 5%and 0%–2%at an interval of 0.5%by weight of pond ash,*** properties(Shear modulus,Number of cycles to initiate liquefaction,Degradation index and Damping ratio)for pond ash mixes were determined using strain-controlled cyclic tri-axial *** shear strain was kept constant at 1.2%and the frequency varied from 0.4 to 1 *** resistance improves when crumb rubber is added to pond ash,however adding Coir fiber to pond ash has essentially no effect on the number of cycles required to initiate *** dynamic shear modulus decreases when crumb rubber was mixed in pond ash whereas when coir fiber is added to pond ash,the dynamic shear modulus increases significantly.A mix of PA,CR,and CF was also tried to balance the number of cycles required to initiate liquefaction and shear *** mixed sample in the proportion of PA(84%)+CR(15)+CF(1%)can be termed a balanced mix as the number of cycles to initiate liquefaction was more than all PA-CF mixes and also the shear modulus was more than all PA-CR *** ratio increases with increasing frequency of loading(0.4 to 1 Hz).

关键词： Pond ash coir crumb rubber cyclic loading liquefaction

Monteggia fracture dislocation equivalents analysis of eighteen cases treated by open reduction and internal fixation

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Chinese Journal of Traumatology 2011年第4期14卷 221-226页

作者： Ajay Pal Singh Ish Kumar Dhammi Anil Kumar Jain Rajeev Raman Prashant Modi punjab civil medical services-I Mukerian Punjab India Department of Orthopaedics UCMS & GTB HospitalDelhi 110095 India

Objective： Monteggia fracture disloca- tion equivalent, though already described by Bado, is still an unclassified entity. We aimed to retrospectively analyze 18 cases of Monteggia variants and discuss the injury mechanisms, management, and outcome along with a re- view of the literature. Methods： A retrospective record of Monteggia frac- ture dislocation （2003-2008） was reviewed from medical record department of our institute. Classic Monteggia frac- ture dislocation, children below 12 years or adults over 50 years, as well as open grade iI ＆ Ill cases were excluded from this study. Monteggia variant inclusion criteria in- cluded fracture of the proximal ulna together with a fracture of the radial head or neck and skeletal maturity. Totally 26 patients were identified with Monteggia variants and 18 were available for follow-up, including 11 males and 7 fe- males with the mean age of 35 years. The ulna fracture was treated by compression plating along with tension band wiring. Radial head/neck was reconstructed in 12 patients while excised in 6 patients. Results： Follow-up ranged from 1-4 years, mean 2.6 years. Patients were assessed clinicoradiologically. MayoElbow Performance Score outcomes. At final follow-up, was employed to assess the the results were excellent in 10 patients, good in 4, fair in 2 and poor in 2. Mean range of motion of the elbow was 20°, 116°, 50° and 55° for extension, flexion, pronation and supination, respectively. Two patients had complications in the form of heterotopic ossification and stiffness of the elbow. One nonunion ulna, primarily treated by tension band wiring, was managed by refixation with locking reconstruction plate and bone grafting. Bone grafting was only required in this patient for nonunion. Another patient had implants removed on his request. The results in our series closely correlated with extent of intraarticular damage, coronoid fracture and comminuted fractures. Conclusions： Monteggia fracture dislocation equiva-

关键词： Monteggia's fracture Radius fracture Ulna

Analyzing geomorphological and topographical controls for the heterogeneous glacier mass balance in the Sikkim Himalayas

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Journal of Mountain Science 2023年第7期20卷 1854-1864页

作者： GUHA Supratim TIWARI Reet Kamal Geomatics Engineering Laboratory Department of Civil EngineeringIndian Institute of Technology RoparPunjab-140001India

Glacier response patterns at the catchment scale are highly heterogeneous and defined by a complex interplay of various dynamics and surface *** studies have explained heterogeneous responses in qualitative ways but quantitative assessment is lacking yet where an intrazone homogeneous climate assumption can be ***,in the current study,the reason for heterogeneous mass balance has been explained in quantitative methods using a multiple linear regression model in the Sikkim Himalayan *** first,the topographical parameters are selected from previously published studies,then the most significant topographical and geomorphological parameters are selected with backward stepwise subset selection ***,the contributions of selected parameters are calculated by least square *** results show that,the magnitude of mass balance lies between-0.003±0.24 to-1.029±0.24 m.w.e.a^(-1) between 2000 and 2020 in the Sikkim Himalaya ***,the study shows that,out of the terminus type of the glacier,glacier area,debris cover,ice-mixed debris,slope,aspect,mean elevation,and snout elevation of the glaciers,only the terminus type and mean elevation of the glacier are significantly altering the glacier mass balance in the Sikkim Himalayan ***,the mass loss is approximately 0.40 m.w.e.a^(-1) higher in the lake-terminating glaciers compared to the land-terminating glaciers in the same elevation *** the other hand,a thousand meters mean elevation drop is associated with 0.179 m.w.e.a-1of mass loss despite the terminus type of the *** the current study,the model using the terminus type of the glaciers and the mean elevation of the glaciers explains 76% of fluctuation of mass balance in the Sikkim Himalayan region.

关键词： Glacier mass balance Glacier terminus Topographical parameter Sikkim Himalaya Multiple linear regression model

Experimental investigation on mechanical properties of binary and ternary blended pervious concrete

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Frontiers of Structural and civil Engineering 2020年第1期14卷 229-240页

作者： Rekha SINGH Sanjay GOEL Department of civil Engineering I.K.Gujral Punjab Technical UniversityJalandhar 144603India Department of civil Engineering DAV Institute of Engineering and TechnologyJalandhar 144008India

The purpose of the investigation was to study the effect of binary and ternary blends of cement on the mechanical properties of pervious concrete(PC)specimen through destructive(DT)and non-destructive testing(NDT).Various combinations of fly ash(FA),limestone powder(LP),metakaolin(MK),and silica fume(SF)as mineral admixtures have been investigated to partially replace the cement up to 30%by weight in *** cube specimens of size 150 mm×150 mm×150 mm of binary and ternary blends of mineral admixture of pervious concrete were prepared to conduct standard compressive strength test and split tensile test at 7 and 28 days of *** ultrasonic pulse velocity(UPV)test and Rebound Hammer test were used as a non-destructive testing tool to substantiate the robustness of PC and to determine the approximate mechanical properties where other destructive testing tools are not feasible in case of inplace pervious *** the pervious concrete made with LP based ternary blends(PLM and PLS)were found to perform better than FA based ternary blends(PFM and PFS)and control mix(PC)in destructive and non-destructive testing.

关键词： mineral admixture ternary compressive strength split tensile strength pervious concrete ultrasonic pulse velocity

Semi-flowable self-consolidating concrete using industrial wastes for construction of rigid pavements in India:An overview

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Journal of Traffic and Transportation Engineering(English Edition) 2023年第2期10卷 243-257页

作者： Bhupati Kannur Hemant Sharad Chore Department of civil Engineering Dr.B.R.Ambedkar National Institute of Technology JalandharPunjabIndia

The construction of rigid pavements using conventionally vibrated concrete consumes a significant amount of energy as it requires rigorous *** also requires a high number of laborers and creates noise during ***,a new kind of concrete called semi-flowable self-consolidating concrete(SFSCC)for pavement construction using slip-form paving technology is reviewed in this *** SFSCC requires no energy for compaction as it gets compacted under its self *** also renders shape stability in the fresh state which is critical to expedite the construction in slip form *** review focuses on the need,evolution,and requirement of the ingredient materials,mix design,and methods for testing the properties of ***,the utilization of industrial wastes in the construction industry and the production of self-consolidating concrete are *** literature on the effect of different materials on the properties of such concrete and field studies in this context are ***,its suitability as pavement construction material either in normal rural roads or in low-volume village roads is discussed in the Indian *** review reveals that relatively less amount of study on SFSCC in general and as a pavement material in particular is available in the literature and pursuant to this,creates a wide scope of research.

关键词： SFSCC SCC Industrial waste materials Concrete pavement Pavement construction

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 dry 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