检索结果-南通市图书馆

Production of biodiesel from palm fatty acid distillate using sulfonated-glucose solid acid catalyst:Characterization and optimization

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Chemical Engineering 2015年第11期23卷 1857-1864页

作者： Ibrahim M.Lokman Umer Rashid yun hin taufiq-yap Catalysis Science and Technology Research Centre Faculty of ScienceUniversiti Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia School of Chemistry Faculty of Applied SciencesUniversiti Teknologi MARA Institute of Advanced Technology Universiti Putra Malaysia

A palm fatty acid distillate （PFAD） has been used for biodiesel production. An efficient sulfonated-glucose acid catalyst （SGAC） was prepared by sulfonation to catalyze the esterification reaction. The effect of three variables i.e. methanol-to-PFAD molar ratio, catalyst amount and reaction time, on the yield of PFAD esters was studied by the response surface methodology （RSM）. The optimum reaction conditions were： 12.2：1 methanol-to- PFAD molar ratio, 2.9% catalyst concentration and 134 rain of time as predicted by the RSM. The reaction under the optimum conditions resulted in 94.5% of the free fatty acid （FFA） conversion with 92.4% of the FAME yield. The properties of the PFAD esters were determined according to biodiesel standards.

关键词： Palm fatty acid distillate (PFAD)5ulfonated-glucose solid acid catalystEsterificationOptimizationPFAD methyl ester

铋和镍对钒磷氧化物催化剂性能的影响(英文)

在线全文

学校读者我要写书评

暂无评论

催化学报 2014年第2期35卷 270-276页

作者： yun hin taufiq-yap Choon Seon Yuen Nawi Mohamed Nurul Suziana Ramli Irmawati Catalysis Science and Technology Research Centre Faculty of ScienceUniversity Putra Malaysia Department of Chemistry Faculty of ScienceUniversiti Putra Malaysia

Vanadium phosphorus oxide (VPO) catalysts were synthesized by the dihydrate method which involved the two steps for the preparation of the dihydrate (VOPO4 2H2 O) and the precursor hemi-hydrate (VOHPO4 0.5H2 O). Bi and Ni salt were added into the mixture of VOPO4 2H2 O and isobu-tanol, and the obtained precursors were calcined in a flow of a n-butane/air mixture to produce the promoted VPO catalysts. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorp-tion- desorption, inductively coupled plasma-atomic emission spectroscopy, scanning electron mi-croscopy (SEM), and H2 temperature-programmed reduction (H2 -TPR). Their catalytic properties were tested using a fixed-bed microreactor. All the catalysts gave main XRD peaks at 2θ = 22.9°, 28.5°, and 30.0°, attributing to the (020), (204), and (221) planes of the pyrophosphate phase (VO)2 P2 O7, respectively. The promoted catalysts have smaller crystallite size and higher specific surface areas. SEM micrographs revealed the formation of more prominent plate-like crystallites that were arranged as rosette clusters. H2 -TPR results showed that the promoted catalysts had lower reduction peak temperatures and possessed higher amounts of V5+-O2– and V4+-O– pairs, which gave higher selectivity and activity in the selective oxidation of n-butane to maleic anhydride.

关键词：氧化物催化剂钒磷氧化物催化性能电感耦合等离子体原子发射光谱法 Bi 镍盐 VPO催化剂扫描电子显微镜

在线全文

学校读者我要写书评

暂无评论

掺Ni钒磷氧化物催化剂的合成和表征

催化学报 2007年第12期28卷 1037-1040页

作者： taufiq-yap yun hin ABDUL GHANI Abdul Aziz 博特拉大学科学院化学系博特拉科学和技术实验室

以VOPO4.2H2O为原料制备了钒磷氧化物催化剂,考察了镍掺杂(1%,2%和5%)对该催化剂的影响.低掺杂量的Ni明显提高了活性晶格氧物种O-的数量,降低了V5+和V4+相的还原峰温.粉末X射线衍射、程序升温还原和化学分析结果表明,高掺杂量的Ni促使V5... 详细信息

以VOPO4.2H2O为原料制备了钒磷氧化物催化剂,考察了镍掺杂(1%,2%和5%)对该催化剂的影响.低掺杂量的Ni明显提高了活性晶格氧物种O-的数量,降低了V5+和V4+相的还原峰温.粉末X射线衍射、程序升温还原和化学分析结果表明,高掺杂量的Ni促使V5+物相生成并抑制V4+物相出现.高含量与V5+相关的氧物种会降低正丁烷的转化率,但会提高马来酸酐的选择性.

关键词：焦磷酸钒酰镍正丁烷氧化马来酸酐

Wax Removal in Textile Manufacturing Wastewater Using Surface Modification of Rice Straw

在线全文

学校读者我要写书评

暂无评论

Wax Removal in Textile Manufacturing Wastewater Using Surfac...

Image-Based Automatic Diagnostic System for Tomato Plants Using Deep Learning

International Conference on Soft Computing and its Applications(ICSCA’2012);International Conference on Power Electronics,Systems and Applications(ICPESA’2012)International Conference on Mechanical,Nanotechnology and Cryogenics Engineering(ICMNC’2012);International Conference on Arts and Business Information Systems(ICAEBIS’2012);International Conference on Chemical,Biological and Medical Sciences(ICCBMS’2012);International Conference on Transport,Environment and Civil Engineering(ICTECE’2012)

作者： Wong Yee Ching Nur Atiqah Abdullah taufiq yap yun hin Noor Azlina Ibrahim Faculty of Agro Base Industry Universiti Malaysia Kelantan Jeli Campus Centre of Excellence for Catalysis Science and Technology Faculty of Science Universiti Putra Malaysia

In this study, the effect of modification surface on lignocellulosic adsorbent （rice straws） was developed and examined. The surface of lignocellulosic adsorbent was treated with Cetylpyridinium chloride （CPC） solution, sodium hydroxide （NaOH） solution and mixture of NaOH and CPC solution at 90 ± 5℃ with different chemical treatments method. The surface morphologies of treated and untreated rice straws were observed by Scanning Electron Microscope （SEM）. The treated rice straws adsorb more wax compared to untreated rice straws.

关键词： Modified Rice Straws Wax Adsorbent Wax Removal Wastewater Treatment Textile Industry Waste Effluent

来源： cnki会议评论

在线全文

cnki会议

学校读者我要写书评

暂无评论

Computers, Materials & Continua 2021年第4期67卷 595-612页

作者： Shaheen Khatoon Md Maruf Hasan Amna Asif Majed Alshmari yun-Kiam yap College of Computer Science and Information Technology King Faisal UniversityAl-Ahsa31982Saudi Arabia College of Science King Faisal UniversityAl-Ahsa31982Saudi Arabia

Tomato production is affected by various threats,including pests,pathogens,and nutritional deciencies during its growth *** control is not timely,these threats affect the plant-growth,fruit-yield,or even loss of the entire crop,which is a key danger to farmers’livelihood and food *** plant disease diagnosis methods heavily rely on plant pathologists that incur high processing time and huge *** and cost-effective methods are essential for timely detection and early intervention of basic food threats to ensure food security and reduce substantial economic *** developments in Articial Intelligence(AI)and computer vision allow researchers to develop image-based automatic diagnostic tools to quickly and accurately detect *** this work,we proposed an AI-based approach to detect diseases in tomato *** goal is to develop an end-to-end system to diagnose essential crop problems in real-time,ensuring high *** paper employs various deep learning models to recognize and predict different diseases caused by pathogens,pests,and nutritional *** Convolutional Neural Networks(CNNs)are trained on a large dataset of leaves and fruits images of tomato *** compared the performance of ShallowNet(a shallow network trained from scratch)and the state-of-theart deep learning network(models are ne-tuned via transfer learning).In our experiments,DenseNet consistently achieved high performance with an accuracy score of 95.31%on the test *** results verify that deep learning models with the least number of parameters,reasonable complexity,and appropriate depth achieve the best *** experiments are implemented in Python,utilizing the Keras deep learning library backend with TensorFlow.

关键词： Tomato plant disease classication and prediction deep learning convolutional neural network RestNet VGGNet DenseNet

β-磷酸三钙的骨诱导性和组织工程应用研究进展

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

中华骨科杂志 2024年第13期44卷 906-914页

作者：杜锦洲钱运范存义上海交通大学医学院附属第六人民医院(国家骨科医学中心)骨科上海200233

目前,在临床中仅应用自体骨已不能满足骨缺损治疗的需求。β-磷酸三钙(beta-tricalcium phosphate,β-TCP)类骨移植替代物因具有良好的修复效果和一定的骨诱导能力而受到广泛关注。可降解β-TCP植入人体后可有效调控炎症,促进血管再生,... 详细信息

目前,在临床中仅应用自体骨已不能满足骨缺损治疗的需求。β-磷酸三钙(beta-tricalcium phosphate,β-TCP)类骨移植替代物因具有良好的修复效果和一定的骨诱导能力而受到广泛关注。可降解β-TCP植入人体后可有效调控炎症,促进血管再生,并以膜内成骨的方式形成新骨,实现骨缺损的愈合。对β-TCP诱导间质干细胞分化为成骨细胞机制的探索也从未停止,最初将骨诱导性归功于被释放钙磷离子和被吸附蛋白的功能,最近的研究热点是材料表面结构对细胞的影响(即整合素与细胞骨架被改变),以及调节信号通路的传导,包括丝裂原活化蛋白激酶/细胞外信号调节激酶(mitogen-activated protein kinase,MAPK/extracellular regulated protein kinases,ERK)通路、WNT家族分泌蛋白通路、Hippo-Yes相关蛋白/转录共激活因子(Yes-associated protein,yap/transcriptional coactivator with PDZ-binding motif,TAZ)通路等。目前,β-TCP产品的基础结构日趋成熟,宏观与微观设计也被不断创新,相关骨移植替代物广泛用于临床,经临床研究证实具有长期的安全性和有效性。

关键词：磷酸钙类组织工程骨缺损

Nd^(3+):GdScO_(3)晶体场能级及拟合分析

在线全文

学校读者我要写书评

暂无评论

物理学报 2024年第4期73卷 1-8页

作者：樊颖张庆礼高进云高宇茜黄磊刘耀安徽大学物质科学与信息技术研究院合肥230601 中国科学院合肥物质科学研究院安徽光学精密机械研究所安徽省光子器件与材料重点实验室合肥230031 先进激光技术安徽省实验室合肥230037 中国科学技术大学合肥230022

采用提拉法生长出了钕掺杂钪酸钆晶体(Nd^(3+):GdScO_(3)),通过低温吸收光谱和室温发射光谱,对其中Nd^(3+)的实验能级进行分析指认,确定了Nd^(3+):GdScO_(3)的66个实验Stark能级,拟合了其自由离子参数和晶体场参数,拟合均方根误差为13.1... 详细信息

采用提拉法生长出了钕掺杂钪酸钆晶体(Nd^(3+):GdScO_(3)),通过低温吸收光谱和室温发射光谱,对其中Nd^(3+)的实验能级进行分析指认,确定了Nd^(3+):GdScO_(3)的66个实验Stark能级,拟合了其自由离子参数和晶体场参数,拟合均方根误差为13.17 cm^(–1).与Nd^(3+):yap和Nd^(3+):YAG相比,Nd^(3+):GdScO_(3)的晶场强度较弱.弱的晶体场强度有可能是Nd^(3+):GdScO_(3)晶体具有优良激光特性的原因之一.本文数据集可在https://***/10.57760/sciencedb.15702中访问获取.

关键词： Nd^(3+):GdScO_(3)晶体晶体场参数能级拟合

Synthesis, Characterization and Phytotoxicity Assessment of Intercalated Insect Pheromone, Lignoceric Acid-Zinc Layered Hydroxide Nanohybrid

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Journal of Environmental Science and Engineering(B) 2023年第2期12卷 75-91页

作者： Rozita Ahmad Mohd Zobir Hussein Siti Halimah Sarijo Wan Rasidah Wan Abdul Kadir taufiq-yap yun hin Forest Biotechnology Division Forest Research Institute MalaysiaKepong 52109SelangorMalaysia Institute of Nanoscience and Nanotechnology Universiti Putra MalaysiaSerdang 43400SelangorMalaysia Faculty of Applied Science Universiti Teknologi MARAShah Alam 40540SelangorMalaysia Chemistry Department Faculty of ScienceUniversiti Putra MalaysiaSerdang 43400SelangorMalaysia

A long chain insect pheromone for subterranean termites, LC (Lignoceric Acid), was intercalated into the inorganic interlayer, ZLH (Zinc Layered Hydroxide), resulting in the formation of a new nanohybrid, labelled as LCN (Lignocerate Nanohybrid). The formation of this inorganic-organic structure nanohybrid was synthesized by the co-precipitation method using ZnO (Zinc Oxide) as the starting material. The PXRD (Powder X-Ray Diffraction) results confirmed the intercalation process although the diffraction patterns of the resultant nanohybrid and the unbound pheromone were fairly similar but both have different basal spacings values. The FTIR (Fourier Transform Infrared) profiles and the chemical composition test supported the intercalation process with the percentage loading of LC into ZLH calculated to be 85%. The thermal stability of the free anion, LC was enhanced when it was transformed into LCN, increasing from 257 °C to 352 °C. The release of LC from the nanohybrid behaved in a sustained manner, governed by the pseudo-second order kinetic model with higher release of LC in sodium carbonate solution than the pH aqueous media. The synthesized nanohybrid was found to be safe for plant germination when the two seed types were successfully germinated in all the tested nanohybrid concentrations. However, the percentage seed germination and the radical seed length from the nanohybrid showed lower values compared to its counterpart anion, LC.

关键词： Insect pheromone ZLH ZnO controlled release termite

Efficient transcription of the larvicidal cry4Bagene from Bacillus thuringiensisin transgenic chloroplasts of the green algal Chlamydomonas reinhardtii

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Advances in Bioscience and Biotechnology 2012年第4期3卷 362-369页

作者： Thanate Juntadech Kittisak Yokthongwattana Sithichoke Tangphatsornruang yun-kiam yap Gerd Katzenmeier Chanan Angsuthanasombat Department of Biochemistry and Center for Excellence in Protein Structure and Function Faculty of Science Mahidol University Bangkok Thailand DivisionInstitute of Molecular Biosciences Mahidol University Salaya Campus Nakornpathom Thailand National Center for Genetic Engineering and Biotechnology Thailand Science Park Pathumthani Thailand

Unicellular micro-alga Chlamydomonas reinhardtii has been recognized as a promising host for expressing recombinant proteins albeit its limited utility due to low levels of heterologous protein expression. Here, transcription of the 3.4-kb mosquito-larvicidal cry4Ba gene from Bacillus thuringiensis in transgenic C. reinhardtii chloroplasts under control of the promoter and 5’-untranslated region of photosynthetic psbA gene was accomplished. Inverted repeats in chloroplast genomes of the host strain with deleted endogenous psbA genes were selected as recombination targets. Two transformant lines were obtained by dual-phenotypic screening via exhibition of resistance to spectinomycin and restoration of photosynthetic activity. Stable and site-specific integration of intact cry4Ba and psbA genes into chloroplast genomes found in both transgenic lines implied homoplasmy of organelle populations. Achievement in cotranscription of cry4Ba and psbA transgenes revealed by RT-PCR and Northern blot analyses demonstrates the sufficiency of this system’s transcription machinery, offering the further innovation for insecticidal protein production.

关键词： Chlamydomonas reinhardtii Chloroplast Transformation Inverted Repeats Bt-cry4Ba Transcript psbA Promoter