National Academy Science Letters最新文献_第4页

Some Geometric Properties of Double Sequences of Bi-complex Numbers 双复数列的若干几何性质

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-13 DOI: 10.1007/s40009-025-01640-3

Sujeet Kumar, Binod Chandra Tripathy

引用次数: 0

On Machining Characteristics of Modified Electrochemical Machining with Fixed Thermoplastic Cathode Cap for Partial Insulation 部分绝缘固定热塑性阴极帽改进电化学加工特性研究

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-11 DOI: 10.1007/s40009-025-01650-1

Rupinder Singh, Gurwinder Singh, Arun Dutt Sharma, Dixit Garg

{"title":"On Machining Characteristics of Modified Electrochemical Machining with Fixed Thermoplastic Cathode Cap for Partial Insulation","authors":"Rupinder Singh, Gurwinder Singh, Arun Dutt Sharma, Dixit Garg","doi":"10.1007/s40009-025-01650-1","DOIUrl":"10.1007/s40009-025-01650-1","url":null,"abstract":"<div><p>For advanced automotive, aeronautical and space applications, conventional (C) electrochemical machining (ECM) is an established tool room process capable of machining hard/ductile/rigid conductive materials. Significant studies have been reported on the C-ECM, modified (M)-ECM with an inter-electrode slit (IES) employed for partial insulation of the cathode to improve the Material Removal Rate (MRR) and other surface characteristics. However, little has been reported on the effect of fixed partial cathode insulation by Thermoplastic Cathode Cap (TCC) on MRR. This study highlights the impact of TCC (as fixed partial cathode insulation) and IES (as floating partial cathode insulation) during M-ECM and C-ECM with Cu as tool and Monel-400 as workpiece (W/P) in terms of MRR and other surface characteristics. The result suggests that the M-ECM with TCC is better than IES and C-ECM for MRR and other surface characteristics. Overall, the best settings for MRR (133.98 × 10<sup>−5</sup> g/s) are the M-ECM process with TCC, voltage 21 V, and a flow rate of 40%, resulting in average grain size number (AGS): 7, porosity (P): 11.38%, and surface roughness (Ra): 16.35 µm.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"557 - 566"},"PeriodicalIF":1.1,"publicationDate":"2025-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695276","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Laser Welding Techniques of Magnesium Alloys- “A Brief Review” 镁合金激光焊接技术综述

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-09 DOI: 10.1007/s40009-025-01648-9

Abhishek Kumar, Lochan Sharma, Kanika Sharma, Narinder Singh

{"title":"Laser Welding Techniques of Magnesium Alloys- “A Brief Review”","authors":"Abhishek Kumar, Lochan Sharma, Kanika Sharma, Narinder Singh","doi":"10.1007/s40009-025-01648-9","DOIUrl":"10.1007/s40009-025-01648-9","url":null,"abstract":"<div><p>Magnesium alloys have major significant interest over the last decade due to their superior qualities, making them desirable for various industrial applications, including railways, construction, energy, electronics, automotive, and aerospace. Laser welding of magnesium alloys are frequently used in various sectors such as in aerospace, aircraft, automotive, electronics, and other industries. The use of laser welding for magnesium alloys, with an emphasis on mechanical characteristics, microstructural advancements, and difficulties encountered in various welding procedures, including CO<sub>2</sub> and Nd YAG lasers. According to investigations, CO<sub>2</sub> lasers offer better control over heat input, whereas Nd YAG lasers offer higher welding penetration. The impact of shielding gas, welding speed, and laser power on the quality of the welded joints is examined, as well as the function of surface preparation in energy absorption. The actual scope of present research is a brief short review on laser welding of different grades of magnesium alloys (such as Alloys AZ61, AZ31, AZ91, and AZ80) were explored for their mechanical properties by using different welding parameters. The use of laser welding for magnesium alloys, with an emphasis on mechanical characteristics, microstructural advancements, and various difficulties encountered in welding of these materials with the use of different lasers such as CO<sub>2</sub> and Nd YAG lasers have been explored. The mechanical properties of AZ91 magnesium alloy such as yield strength (123 Mpa) and tensile strength (178 Mpa) with elongation (18%). AZ31 magnesium alloy has yield strength of 127 Mpa and tensile strength of 195 Mpa with elongation upto 19%. Hardness value of AZ31 magnesium alloy is 65 Hv while AZ91 magnesium alloy of 54 Hv.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"615 - 620"},"PeriodicalIF":1.1,"publicationDate":"2025-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695496","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Begonia ovatifolia var. raimonaensis (Begoniaceae), a New Variety from Northeast India 标题印度东北一新品种——卵泡海棠科

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-08 DOI: 10.1007/s40009-025-01663-w

Sanswrang Basumatary, Sanjib Baruah, Nazrul Islam

引用次数: 0

Precocious puberty: pathophysiology, contemporary issues and way forward 性早熟：病理生理、当代问题及未来方向

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-06 DOI: 10.1007/s40009-025-01654-x

Antara A. Banerjee, Swati Kashikar, Sudha Rao, Suchitra V. Surve

{"title":"Precocious puberty: pathophysiology, contemporary issues and way forward","authors":"Antara A. Banerjee, Swati Kashikar, Sudha Rao, Suchitra V. Surve","doi":"10.1007/s40009-025-01654-x","DOIUrl":"10.1007/s40009-025-01654-x","url":null,"abstract":"<div><p>Precocious puberty, characterized by the premature sexual developmental onset before the age of 8 in girls and 9 in boys, has been linked with individuals developing adverse psychosocial and metabolic conditions in later life. In recent years and especially after the COVID-19 pandemic, there has been an increase in the number of early puberty cases globally and this has become a significant concern for healthcare providers. Isolated indoor confinement and home quarantine, increased electronic gadget usage, disruption of normal sleep pattern, changes in dietary intake, minimal physical activity and exposure to endocrine-disrupting chemicals are contributing risk factors in the development of precocious puberty. The gonadotropin releasing hormone-stimulation test, although being a gold standard for identifying precocious puberty, is known for its anxiety-inducing nature due to multiple pricks and blood drawings. Moreover, the unavailability of set cut-offs for basal and stimulated gonadotropin levels underscores the importance of identifying novel biomarkers which play a role in the development of this condition. This short commentary emphasizes prevalent risk factors that may contribute in the disruption of normal pubertal timing and highlights the importance of a multidisciplinary approach involving pediatric endocrinologists, geneticists, psychologists, schools and social support systems to understand the complex interplay of risk factors and develop strategies for mitigating this condition. It also highlights the importance of developing techniques that will help in the accurate distinction between the types of precocious puberty, their diagnosis and management, which may help healthcare professionals implement proper treatment strategy.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"627 - 631"},"PeriodicalIF":1.1,"publicationDate":"2025-05-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695196","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

In Vitro Formulation and Potential Biological Activities of Metabolites Consortium with High Biocompatibility Derived from Poly Herbal Plant Extracts 多聚植物提取物高生物相容性代谢物联合体的体外配方及潜在生物活性研究

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-05 DOI: 10.1007/s40009-025-01656-9

T. Abiraamavalli, S. Karthick Raja Namasivayam

{"title":"In Vitro Formulation and Potential Biological Activities of Metabolites Consortium with High Biocompatibility Derived from Poly Herbal Plant Extracts","authors":"T. Abiraamavalli, S. Karthick Raja Namasivayam","doi":"10.1007/s40009-025-01656-9","DOIUrl":"10.1007/s40009-025-01656-9","url":null,"abstract":"<div><p>In the present study, the metabolites consortium was formulated from solvent extract of <i>Acorus calamus Tinospora cordifolia</i>, <i>Coscinium fenestratum</i>, <i>Terminalia chebula</i>, <i>Smilax china</i> using green science principles followed by screening of biological activities like anti-oxidant, anti-inflammatory, anti-diabetic and anti-microbial activities. The metabolite consortium exhibited notable antioxidant activity, demonstrated by its significant free radical scavenging activity. Furthermore, the consortium did not induce adverse effects on human red blood cell membrane stabilization, indicating its anti-inflammatory properties, which were further supported by in silico analysis. Moreover, the metabolite consortium showed antibacterial activity by inhibiting the growth of bacterial strains. Its antidiabetic activity was confirmed through distinct changes in alpha-amylase enzyme activity upon treatment. These findings suggest the potential utilization of the metabolite consortium as an effective, safe, and biocompatible bioactive drug formulation.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"587 - 593"},"PeriodicalIF":1.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s40009-025-01656-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Optimization of Sterilization, Callogenesis and Shoot Organogenesis in Carambola (Averrhoa carambola L.) Using Nodal Explants 杨桃（Averrhoa Carambola L.）灭菌、胼胝质形成和芽器官发生的优化使用节点外植体

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-05 DOI: 10.1007/s40009-025-01657-8

J. Adarsh Reddy, Prashant Kisan Nimbolkar, Siddhartha Singh, Amit Kumar Singh, Tasso Yatung, Barun Singh

{"title":"Optimization of Sterilization, Callogenesis and Shoot Organogenesis in Carambola (Averrhoa carambola L.) Using Nodal Explants","authors":"J. Adarsh Reddy, Prashant Kisan Nimbolkar, Siddhartha Singh, Amit Kumar Singh, Tasso Yatung, Barun Singh","doi":"10.1007/s40009-025-01657-8","DOIUrl":"10.1007/s40009-025-01657-8","url":null,"abstract":"<div><p><i>Averrhoa carambola L</i> is a minor fruit that has great potential to be explored at a commercial scale. It is generally propagated through seed and other vegetative propagation methods, but in vitro regeneration methods facilitate rapid regeneration of desired superior genotypes. The in vitro culture studies were conducted in carambola using nodal explants. The nodal explants were disinfected with Sodium hypochlorite (NaOCl) at 4% and Mercuric chloride (HgCl<sub>2</sub>) at 0.2–0.4% in various combinations and durations. The treatment with HgCl<sub>2</sub> (0.2%) for 5 min followed by NaOCl (4%) for 10 min was standardized for explant sterilization. The highest callus induction of 82.02% was achieved better in the Murashige and Skoog (MS) medium provided with 2,4-Dichlorophenoxyacetic acid (0.4 mg/L) was very potent in callus induction and produced the best results along with a combination of BAP (6-benzylaminopurine) 4.0 mg/L. For shoot organogenesis, the obtained results clearly state BAP 0.5 mg/L and NAA 0.1 mg/L (1-Napthaleneacetic Acid) at optimum concentration and combination play a major role in inducing shoot organogenesis in nodal explants of carambola.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"595 - 600"},"PeriodicalIF":1.1,"publicationDate":"2025-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Identifying the Geospatial Burden of Childhood Stunting in Bihar 比哈尔邦儿童发育迟缓的地理空间负担

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-03 DOI: 10.1007/s40009-025-01644-z

Venkata Naga Sindhuja Padigapati, Alka Singh, Praveen Koovalamkadu Velayudhan, Girish Kumar Jha

{"title":"Identifying the Geospatial Burden of Childhood Stunting in Bihar","authors":"Venkata Naga Sindhuja Padigapati, Alka Singh, Praveen Koovalamkadu Velayudhan, Girish Kumar Jha","doi":"10.1007/s40009-025-01644-z","DOIUrl":"10.1007/s40009-025-01644-z","url":null,"abstract":"<div><p>Despite Bihar’s sustained economic growth, improvements in nutritional outcomes have not kept pace. The burden of undernutrition among children under the age of five in Bihar remains high. We conducted a study using spatial analysis to examine the distribution of stunting in children under five years of age in Bihar, based on the 2019–2021 Demographic and Health Survey. The study found that stunting is still a persistent issue in the country, albeit with varying rates across states. Although there have been some improvements in Bihar in terms of nutrition, stunting still prevails more in rural areas than in urban ones. Additionally, male children in Bihar are slightly more affected by stunting than female children, and those between the ages of 24–59 months are more susceptible than those aged between 0 and 24 months. The Getis-Ord Gi* statistic identified significant hot spot areas for stunting in India, including Sheikhpura, Sitamarhi, Gaya, Purba Champaran, and Darbhanga as the hotspot areas for childhood stunting in Bihar. The Spatial Scan Statistical Analysis identified one main cluster and five secondary clusters of stunting in Bihar. In total, there were 26 direct significant groups and 51, 107, 1, 1, and 147 significant groups in secondary clusters 1 to 5, respectively. Our study’s findings can help to develop strategies and localized interventions to combat stunting in Bihar. It is crucial to design public health interventions that target high-risk populations to reduce stunting in the worst-affected regions of Bihar.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 4","pages":"529 - 533"},"PeriodicalIF":1.1,"publicationDate":"2025-05-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148695084","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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First Record of Leucauge rubromaculata Benjamin, 2024 (Araneae, Tetragnathidae) from India 文章标题印度鲁氏白蛛首录，2024（蛛目，蛛科）

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-05-03 DOI: 10.1007/s40009-025-01645-y

Kuriakkattil Baby Anju, Souvik Sen, Puthoor Pattammal Sudhin, Ambalaparambil Vasu Sudhikumar

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Applicability of Random Forest Regressor for Prediction of Fluoride in Groundwater 随机森林回归量在地下水氟化物预测中的适用性

IF 1.1 4区综合性期刊

National Academy Science Letters Pub Date : 2025-04-30 DOI: 10.1007/s40009-025-01664-9

Abhishek Kumar Mishra, Nityanand Singh Maurya

{"title":"Applicability of Random Forest Regressor for Prediction of Fluoride in Groundwater","authors":"Abhishek Kumar Mishra, Nityanand Singh Maurya","doi":"10.1007/s40009-025-01664-9","DOIUrl":"10.1007/s40009-025-01664-9","url":null,"abstract":"<div><p>This research is employed for the applicability of artificial intelligence and machine learning for the prediction by application of Random Forest Regressor (RFR) model to predict fluoride concentrations in water samples, utilizing key water quality parameters. The performance of the model is assessed using several metrics: Mean Squared Error (MSE), Root Mean Squared Error (RMSE), Nash-Sutcliffe Efficiency (NSE), and Coefficient of Determination (R²). The RFR model performs with MSE of 0.0068, RMSE of 0.0825 and NSE and R² of 0.863, which implies it performs with good predictive accuracy. It is also observed that in the learning curve that the model suffered from overfitting, as evidenced by the distance between training and validation errors, which indicates good performance in training data. Feature importance analysis demonstrates that chloride, sodium, magnesium, and potassium variables are the most important predictors of fluoride, while factors such as electrical conductivity and pH are shown as moderately important factors. These results validate the effectiveness of machine learning model for predicting fluoride concentrations in groundwater to address water contamination issues.</p></div>","PeriodicalId":717,"journal":{"name":"National Academy Science Letters","volume":"49 5","pages":"669 - 673"},"PeriodicalIF":1.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"149099271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0