检索结果-南通市图书馆

Early Paleozoic basement diorite of arc-magmatism from kutch basin, Western India

在线全文

学校读者我要写书评

暂无评论

Acta Geochimica 2024年第2期43卷 296-307页

作者： Piyush gupta sandeep Singh Shakti Singh Rathore Argha Narayan Sarkar Geochronology Laboratory KDMIPEOil and Natural Gas Corporation Ltd.9Kaulagarh RoadDehradun 248195India Department of Earth Sciences Indian Institute of TechnologyRoorkee 247667India

In this study,we report for theﬁrst time an Early Palaeozoic basement diorite from the drilled well Nirona-A in the Banni Half-Graben of the kutch basin,western *** 40Ar–39Ar dates provided a plateau age of 441.84±2.66 Ma and another pseudo plateau of 441.28±5.82 to 388.08±16.65 Ma for the basement *** ages constrain the basement formation age to the Late Ordovician-Early Silurian *** obtained basement ages are correlatable with the later part of Cambro-Ordovician alkaline magmatism that has been reported from the Huqf area in Central Oman,whereas their lithological and petrographic correlativity with base-ment diorites occurring in the Dinsi Body of Nagar Parkar igneous complex in Pakistan can also be *** geochemical studies characterized the diorite with enrich-ment of LILE(Rb,Ba,and k)and LREE(La,Ce,Nd),strong depletion of HFSE(Nb,Sr,P,and Ti),along with weakly negative Eu *** geochemical signatures indicate their petrogenetic afﬁliation with mantle-derived magmas,as well as their tectonic setting to be arc-related,having post-collisional continental-arc type afﬁ****440 Ma basement of kutch,therefore,appears to rep-resent the later thermal event associated with the reworked Neoproterozoic subduction-related suite from Greater India’s northwest edge,which has implications for Gond-wana assembly in the northwest Indian subcontinent.

关键词： kutch basin 40Ar–39Ar ages Early palaeozoic basement Continental-arc magmatism Calc-alkaline magmatism

Techno-economic and environmental impact analysis of electric two-wheeler batteries in India

在线全文

学校读者我要写书评

暂无评论

CLEAN ENERGY 2024年第3期8卷 147-156页

作者： gupta, Aman Bose, Ditipriya Tiwari, sandeep Sharma, Vikrant Prakash, Jai Aligarh Muslim Univ Zakir Husain Coll Engn & Technol Dept Green Energy & Sustainable Dev Aligarh 202002 Uttar Pradesh India Natl Inst Solar Energy Battery Testing Facil Gurugram Faridabad Rd Gurugram 122003 Haryana India

This paper presents a comprehensive techno-economic and environmental impact analysis of electric two-wheeler batteries in India. The technical comparison reveals that sodium-ion (Na-ion) and lithium-ion (Li-ion) batteries outperform lead-acid batteries in various parameters, with Na-ion and Li-ion batteries exhibiting higher energy densities, higher power densities, longer cycle lives, faster charge rates, better compactness, lighter weight and lower self-discharge rates. In economic comparison, Na-ion batteries were found to be similar to 12-14% more expensive than Li-ion batteries. However, the longer lifespans and higher energy densities of Na-ion and Li-ion batteries can offset their higher costs through improved performance and long-term savings. Lead-acid batteries have the highest environmental impact, while Li-ion batteries demonstrate better environmental performance and potential for recycling. Na-ion batteries offer promising environmental advantages with their abundance, lower cost and lower toxic and hazardous material content. Efficient recycling processes can further enhance the environmental benefits of Na-ion batteries. Overall, this research examines the potential of Na-ion batteries as a cheaper alternative to Li-ion batteries, considering India's abundant sodium resources in regions such as Rajasthan, Chhattisgarh, Jharkhand and others.

关键词： electric two-wheelers environmental impact assessment lead-acid batteries lithium-ion batteries sodium-ion batteries techno-economic analysis VEHICLES TECHNOLOGIES HYBRID

Linear and nonlinear propagation characteristics of multi-Gaussian laser beams

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Chinese Physics B 2020年第11期29卷 370-379页

作者： Naveen gupta sandeep kumar Lovely Professional University PhagwaraIndia

Theoretical investigation on the propagation characteristics of a new class of laser beams known as multi Gaussian(M.G)laser beams has been *** investigate the linear characteristics,propagation of the laser beam in vacuum has been ***,the nonlinear characteristics have been investigated in *** nonlinearity of the plasma has been modeled by relativistic mass nonlinearity of the plasma electrons in the field of laser *** is based on finding the semi analytical solution of the wave equation for the slowly varying envelope of the laser ***,the dynamical evolutions of the beam width and longitudinal phase of the laser beam have been investigated in detail.

关键词： self-focusing multi Gaussian self phase modulation self-channeling

Impact of binary blends of biodiesels on fuel quality,engine performance and emission characteristics

在线全文

学校读者我要写书评

暂无评论

Clean Energy 2023年第2期7卷 417-425页

作者： sandeep gupta Mahendra Pal Sharma Department of Hydro and Renewable Energy Indian Institute of Technology RoorkeeUttarakhand(247667)India

The incessant pressure of energy requirements by the growing global populace has led to the exploration of unconventional methods to produce renewable and sustainable *** these,biodiesel is most suited to the present needs of eco-friendly standards to keep the atmosphere free from residual *** fuel-modification methods were developed over a couple of decades to make biodiesel suitable for diesel *** the present research,Jatropha curcas biodiesel and waste-cooking-oil(WCO)biodiesel were used to craft a unique binary blend to obtain desirable fuel properties and operational suitability for the diesel *** blend with 80% WCO biodiesel and 20% *** biodiesel,which had the most suitable fuel properties,was tested on a four-stroke single-cylinder vertical diesel *** emissions and operational parameters were analysed and compared with *** results of the study indicated that engine emissions for binary blend,carbon monoxide and unburnt hydrocarbon emissions were highly reduced,and carbon dioxide and nitrogen oxide(NO_(x))emissions increased relative to *** full load,NO_(x) emission was found to be 51.32% higher than that from diesel and 3.8% lower than that from WCO *** performance showed that for the binary blend,at full load,the brake-specific fuel consumption was 396.82 g/kWh,which was 15.26% higher,and the brake thermal efficiency was 22.7%,which was 2.74% lower than regular diesel *** present study suggests that the binary blend of *** biodiesel and WCO biodiesel can be a promising approach towards advancements in the fuel properties of biodiesels.

关键词： binary blends waste-cooking-oil biodiesel Jatropha curcas biodiesel engine emission engine performance

Current and New Drugs for COVID-19 Treatment and Its Effects on the Liver

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Clinical and Translational Hepatology 2021年第3期9卷 436-446页

作者： sandeep Satsangi Nitin gupta Parul kodan Department of Apollo comprehensive Liver Care Apollo HospitalBangaloreKarnatakaIndia Department of Infectious Diseases Kasturba Medical CollegeManipal Academy of Higher EducationManipalKarnatakaIndia Department of Medicine All India Institute of Medical SciencesNew DelhiIndia

Corona virus disease(COVID)-19 is caused by the novel severe acute respiratory syndrome coronavirus-2(commonly referred to as SARS-CoV-2).In March 2020,the World Health Organization declared the COVID-19 outbreak a *** the target organ for the virus is primarily the lungs,with the recent understanding of the pathobiology of this disease and the immune dysregulation associated with it,it is now clear that COVID-19 affects multiple organ *** drugs and therapies have been tried or repurposed to combat the wrath posed by this *** October 22,2020,the USA Food and Drug Administration approved remdesivir for use in adults and pediatric patients(12 years of age and older).Several of the drugs being tried against COVID-19 have hepatotoxicity as their potential side *** review aims to provide the latest insights on various drugs being used in the treatment of COVID-19 and their effects on the liver.

关键词： COVID-19 Drugs Liver Drug-induced liver injury

PAPR Reduction of NOMA Using Vandermonde Matrix-Particle Transmission Sequence

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Computer Systems Science & Engineering 2022年第10期43卷 193-201页

作者： Arun kumar sandeep gupta Himanshu Sharma Mehedi Masud Department of Electronics and Communication Engineering JECRC UniversityJaipur303905India Department of Electrical Engineering JECRC UniversityJaipur303905India Department of Computer Science and Engineering JECRC UniversityJaipur303905India Department of Computer Science College of Computers and Information TechnologyTaif University11099Saudi Arabia

Non-Orthogonal Multiple Access(NOMA)is an ideal choice for 5G waveforms due to their characteristics such as high data rate,massive device connectivity,high spectral access,and effective frequency selective ***,it permits gigantic *** spectrum overlaps with NOMA,which consents several operators to segment the spectrum at the same *** features make NOMA more suitable for use beyond *** to Average Power(PAPR)is a major problem in Multi-Carrier Techniques(MCT)like NOMA and it also degrades the performance of the *** Partial Transmission Sequence(PTS)is a superior algorithm for moderating the ***,it also increases the complexity of the *** PAPR is reduced in NOMA by multiplying the NOMA signal with optimised phase vectors(P).The phase vectors are generated by using the Vandermonde Matrix(VM).In this work,we proposed a VM-PTS algorithm for the NOMA system,and the number of computations to search the optimal phase vectors for NOMA high PAPR signal is less as compared with existing *** outcomes demonstrate that the performance of the recommended PTS in terms of PAPR,Bit Error Rate(BER),and complexity is better than the conventional PTS(C-PTS).

关键词： VM-PTS NOMA PAPR 5G

Effect of plumbagin free alcohol extract of Plumbago zeylanica Linn,root on reproductive system of female Wistar rats

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Asian Pacific Journal of Tropical Medicine 2011年第12期4卷 978-984页

作者： gupta sandeep Ahirwar Dheeraj Sharma Neeraj kumar Jhade Deenanath Ahirwar Bharti School of Pharmacy Chouksey Engineering CollegeBilaspur(C.G.)India 495001 SLT Institute of Pharmaceutical Sciences Guru Ghasidas University.Bilaspur(C.G.)India 495001

Objective:To assess the effect of plumbagin-free alcohol extract（PFAE） of Plumbago zeylanica Linn.（Plumbaginaceae）（***） root,on female reproductive system and ferlility of adult Female wislar ***:After the oral acute toxicity study,the PFAE was administered at two dose levels to perform the estrous cycle study,anti-implantation and ahortifacient activity and hormonal ***,the estrogenic/antiestrogenic activity was evaluated at only one most effective ***:LD50 cut-off was 5 000 mg/kg body *** extract exhibited significant anti-implantation and ahortifacient activity at the tested dose levels（300 and 500 mg/ kg.p.o.）（P<0.01）.The extract dose-dependency decreased the levels of serum progesterone, follicle stimulating hormone and luteinizing hormone,while a dose-dependent increase was observed in the concentration of serum *** extract did not show any significant changes in structure and function of Uterus when given alone,hut when given along with ethinyl estradiol,it exhibited significant antiestrogenic activity in immature overieclonzed female rats（P<0.001） Biochemical parameters in the serun/blood and haematological parameters did not show appreciable changes throughout and after the course of ***,all the altered parameters returned to normalcy within 30 days following withdrawal of treatment. Conclusions:All findings suggest that the anlifcrtility activity of extract could possibly he through the changes in the implantation site,altered hormonal levels,prolonged estrous cycle and anti-estrogenic ***,the extract possesses reversible antifcrtility activity without adverse toxicity in female rats.

关键词： Anti-implantation Abortilacient Estrogenic/antiestrogenic activity Progesterone Follicle stimulating hormone Luteinizing hormone Prolactin Ethinyl estradiol Overiectomized Haematological

Predictors of Mortality at 28-days in Infection associated Acute kidney Injury in Cirrhosis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

World Journal of Hepatology 2022年第3期14卷 592-601页

作者： Tarana gupta Naveen Ranga sandeep kumar Goyal Department of Medicine Pandit Bhagwat Dayal Sharma Post Graduate Institute of Medical SciencesRohtak 124001HaryanaIndia Independent Researcher Kangra 176056Himachal PradeshIndia

BACkGROUND Acute kidney injury(AkI)in cirrhosis is important complication with poor *** infections are common cause for acute *** in cirrhosis lead to acute deterioration of hemodynamics leading to precipitation of *** To study predictors of mortality in patients with infection-associated AkI in *** This was a prospective,observational study conducted at Tertiary care centre from January 2018 till April *** 119 participants with cirrhosis of liver presenting with AkI were included into the *** was defined as per international club of Ascites-AkI criteria *** were grouped into infection AkI and non-infection ***-infection AkI included patients with diuretic induced AkI and pre-renal *** regression analysis was used to determine predictors of mortality at *** Out of 119 patients,alcohol(n=104)was most common etiology of *** infection AkI included 67(56%)patients and non-infection AkI(n=52)included pre-renal AkI in 36(30%)and diuretic-induced AkI in 16(14%)*** AkI had significantly higher bilirubin,higher international normalized ratio(INR),low serum sodium,higher total leukocyte count(TLC)and higher prevalence of hepatic encephalopathy(HE)as compared to non-infection *** AkI had higher progression of AkI(19/67 vs 2/52;P=0.01)and 28-d mortality(38/67 vs 4/5;P≤0.01)as compared to non-infection *** 28-d,non-survivors(n=42)had significantly higher bilirubin,higher INR,low serum sodium,higher TLC and higher prevalence of HE as compared to survivors(n=77).On subgroup analysis of Infection AkI group,on multivariate analysis,serum bilirubin as well as presence of HE were independent predictors of 28-d *** was no significant difference of mortality at 90-d between two *** Infection AkI in cirrhosis has a dismal prognosis with higher 28-d mortality as compared to noninfection *** bilirubin and presence of HE predict

关键词： Infection Acute kidney injury Mortality Cirrhosis Bilirubin Hepatic encephalopathy

Review of current progress in hole-transporting materials for perovskite solar cells

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2022年第5期31卷 330-386页

作者： Prerna Mahajan Bhavya Padha Sonali Verma Vinay gupta Ram Datt Wing Chung Tsoi Soumitra Satapathi sandeep Arya Department of Physics University of JammuJammuJammu and Kashmir 180006India Department of Physics Khalifa University of Science and TechnologyAbu Dhabi 127788United Arab Emirates SPECIFIC College of EngineeringSwansea University Bay CampusFabian WaySA18ENSwanseaUnited Kingdom Department of Physics Indian Institute of Technology RoorkeeUttarakhand 247667India

Recent advancements in perovskites’ application as a solar energy harvester have been astonishing. The power conversion efficiency(PCE) of perovskite solar cells(PSCs) is currently reaching parity(>25 percent), an accomplishment attained over past decades. PSCs are seen as perovskites sandwiched between an electron transporting material(ETM) and a hole transporting material(HTM). As a primary component of PSCs, HTM has been shown to have a considerable effect on solar energy harvesting, carrier extraction and transport, crystallization of perovskite, stability, and price. In PSCs, it is still necessary to use a *** perovskites are capable of conducting holes, they are present in trace amounts, necessitating the use of an HTM layer for efficient charge extraction. In this review, we provide an understanding of the significant forms of HTM accessible(inorganic, polymeric and small molecule-based HTMs), to motivate further research and development of such materials. The identification of additional criteria suggests a significant challenge to high stability and affordability in PSC.

关键词： Hole transporting material Perovskite solar cells Power conversion efficiency Stability