全文获取类型
收费全文 | 796篇 |
免费 | 89篇 |
国内免费 | 2篇 |
专业分类
电工技术 | 4篇 |
综合类 | 2篇 |
化学工业 | 341篇 |
金属工艺 | 17篇 |
机械仪表 | 13篇 |
建筑科学 | 14篇 |
矿业工程 | 1篇 |
能源动力 | 38篇 |
轻工业 | 104篇 |
水利工程 | 14篇 |
石油天然气 | 6篇 |
无线电 | 62篇 |
一般工业技术 | 158篇 |
冶金工业 | 10篇 |
原子能技术 | 10篇 |
自动化技术 | 93篇 |
出版年
2024年 | 4篇 |
2023年 | 23篇 |
2022年 | 58篇 |
2021年 | 72篇 |
2020年 | 62篇 |
2019年 | 68篇 |
2018年 | 91篇 |
2017年 | 71篇 |
2016年 | 72篇 |
2015年 | 38篇 |
2014年 | 56篇 |
2013年 | 78篇 |
2012年 | 51篇 |
2011年 | 48篇 |
2010年 | 36篇 |
2009年 | 15篇 |
2008年 | 15篇 |
2007年 | 10篇 |
2006年 | 7篇 |
2005年 | 3篇 |
2004年 | 1篇 |
2001年 | 2篇 |
2000年 | 1篇 |
1999年 | 2篇 |
1998年 | 1篇 |
1992年 | 1篇 |
1989年 | 1篇 |
排序方式: 共有887条查询结果,搜索用时 15 毫秒
71.
Mehrorang Ghaedi Javad Tashkhourian Arezoo Amiri Pebdani Batol Sadeghian Fatemeh Nami Ana 《Korean Journal of Chemical Engineering》2011,28(12):2255-2261
The proposed research describes the synthesis and characterization of platinum nanoparticles loaded on activated carbon (Pt-NP-AC)
and its efficient application as novel adsorbent for efficient removal of reactive orange 12 (RO-12). The influences of effective
parameters following the optimization of variables on removal percentages, their value was set as 0.015 g Pt-NP-AC, pH 1,
contact time of 13 min. At optimum values of all variables at 25 and 50 mgL−1 of RO-12 enthalpy (ΔH0) and entropy (ΔS0) changes was found to be 59.89 and 225.076, respectively, which negative value of ΔG0 shows a spontaneous nature, and the positive values of ΔH0 and ΔS0 indicate the endothermic nature and adsorption organized of dye molecule on the adsorbent surface. Experimental data was
fitted to different kinetic models including first-order, pseudo-second-order, Elovich and intra-particle diffusion models,
and it was seen that the adsorption process follows pseudo-second-order model in consideration to intra-particle diffusion
mechanism. At optimum values of all variables, the adsorption process follows the second-order kinetic and Langmuir isotherm
model with adsorption capacity 285.143 mg g−1 at room temperature. 相似文献
72.
Noorossadat Seyyedi Fatemeh Farjadian Ali Farhadi Gholamreza Rafiei Dehbidi Reza Ranjbaran Farahnaz Zare Mohammad Ali Okhovat Negin Nikouyan Abbas BehzadBehbahani 《IET nanobiotechnology / IET》2020,14(7):555
Gold nanoparticles (AuNPs) are commonly used in biosensors of various kinds. However, its application to extract DNA from cancer tissues has not been extensively studied. The purification of DNA from cancer tissues is an important step in diagnostic and therapeutic development. Almost, all cervical cancer cases are associated with high‐risk human papillomavirus (HR‐HPV) infection. Accurate viral diagnosis has so far relied on the extraction of adequate amounts of DNA from formalin‐fixed, paraffin‐embedded (FFPE) tissue samples. Till now, no specific and sensitive DNA purification method has been introduced for the extraction of HR‐HPV from FFPE tissue. Since the commercially available purification kits are not sensitive and specific enough for HR‐HPV DNA targets, in this study, a DNA purification method was designed based on AuNPs to purify sufficient amounts of HR‐HPV DNA from cervical cancer tissue samples. AuNPs were coated with a series of oligonucleotide probes to hybridize to specific DNA sequences of HR‐HPV genotypes. Results showed that 733 out of 800 copies of type‐specific HPV DNA were recovered with complete specificity, compared to 36 copies with a standard commercial kit (Qiagen FFPE). The high yield of DNA (91.6%) is the main advantage of the AuNPs‐probe purification method.Inspec keywords: cancer, biological tissues, microorganisms, gold, DNA, lab‐on‐a‐chip, gynaecology, purification, biochemistry, molecular biophysics, nanoparticles, nanomedicine, cellular biophysicsOther keywords: specific extraction method, cervical cancer tissue samples, high‐risk human papillomavirus infection, paraffin‐embedded tissue samples, specific DNA purification method, sensitive DNA purification method, FFPE tissue, HR‐HPV DNA targets, specific DNA sequences, HR‐HPV genotypes, type‐specific HPV DNA, AuNP‐probe purification method, gold nanoparticle‐based DNA isolation method, oligonucleotide, human papillomaviruse genotypes, clinical samples, Au 相似文献
73.
74.
Mousavi Fatemeh Abdi Ehsan Fatehi Parviz Ghalandarzadeh Abbas Bahrami Hossein Ali Majnounian Baris Ziadi Noura 《Bulletin of Engineering Geology and the Environment》2021,80(5):3923-3938
Bulletin of Engineering Geology and the Environment - Understanding the physical and especially mechanical properties of forest soils is very important in forest engineering operations including... 相似文献
75.
Shaghayegh Baradaran Ghavami Hamid Asadzadeh Aghdaei Dario Sorrentino Shabnam Shahrokh Maryam Farmani Fatemeh Ashrafian Maria Pina Dore Shahrbanoo Keshavarz Azizi Raftar Seyed Mobin Khoramjoo Mohammad Reza Zali 《International journal of molecular sciences》2021,22(15)
Inflammatory bowel diseases (IBDs) are immune-mediated, chronic relapsing diseases with a rising prevalence worldwide in both adult and pediatric populations. Treatment options for immune-mediated diseases, including IBDs, are traditional steroids, immunomodulators, and biologics, none of which are capable of inducing long-lasting remission in all patients. Dendritic cells (DCs) play a fundamental role in inducing tolerance and regulating T cells and their tolerogenic functions. Hence, modulation of intestinal mucosal immunity by DCs could provide a novel, additional tool for the treatment of IBD. Recent evidence indicates that probiotic bacteria might impact immunomodulation both in vitro and in vivo by regulating DCs’ maturation and producing tolerogenic DCs (tolDCs) which, in turn, might dampen inflammation. In this review, we will discuss this evidence and the mechanisms of action of probiotics and their metabolites in inducing tolDCs in IBDs and some conditions associated with them. 相似文献
76.
The application of metal mordants is usually necessary in dyeing of wool with natural dyes to improve the dye exhaustion and fastness properties. The majority of metal salts generally used as mordants are considered as toxic and it is important to find replacements for them. Plant sources with high content of tannins are good candidates as bio-mordant or colourant to overcome this drawback. In this study, the waste fallen leaves of pomegranate tree were used as a source of natural dye for the eco-friendly dyeing of wool fabric without the use of metal mordants. The dyeing process variables including dye concentration, dyebath pH, and temperature were optimised using response surface methodology to obtain the highest colour strength. The colour strength was increased by increasing the natural dye powder up to 100%owf while the optimum pH and dyebath temperature were 4 and 100°C, respectively. The sample dyed under the optimal condition exhibited good fastness properties against washing and light. This study approved the potential of Punica granatum fallen leaves for the dyeing of wool without any mordant, while high fastness properties were obtained. 相似文献
77.
Knowledge of the business domain (e.g., insurance claim, human resources) is crucial to analysts’ ability to conduct good requirements analysis (RA). However, current practices afford little assistance to analysts in acquiring domain knowledge. We argue that traditional reuse repositories could be augmented by adding rich faceted information on component/services and artifacts such as business-process templates to help analysts acquire domain knowledge during RA. In this paper, we present the design of a Knowledge Based Component Repository (KBCR) for facilitating RA. Then, we report on the design and development of a KBCR prototype. We illustrate its application in a system that is populated with components and process templates for the auto insurance claim domain. An empirical study was conducted to assess its effectiveness in improving RA. Results showed that KBCR enhanced analysts’ business domain knowledge and helped them better prepare for RA. Our key research contribution is to offer analysts a rich repository (i.e., KBCR) containing domain knowledge that they could utilize to acquire domain knowledge that is crucial for carrying out RA. While repositories of reusable components have been employed for some time, no one has used such repositories to help analysts acquire domain knowledge in order improve the RA of the system. 相似文献
78.
[Bis(salicylidene)nickel(II)] was used as a precursor to prepare nickel sulfides nanoparticles of average size 20 nm by a chemical process in oleylamine. The products were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), X-ray photoelectron spectroscopy (XPS), ultraviolet-visible spectroscopy (UV-vis) and photoluminescence (PL) spectroscopy. Magnetization measurement indicates that both of the α-NiS and Ni3S4 nanoparticles show pramagnetism due to the size effect. 相似文献
79.
80.
Mohammad Norouzi Masoud Soleimani Iman Shabani Fatemeh Atyabi Hana H. Ahvaz Abusaeed Rashidi 《Polymer International》2013,62(8):1250-1256
The main purpose of tissue engineering is the preparation of fibrous scaffolds with similar structural and biochemical cues to the extracellular matrix in order to provide a substrate to support the cells. Controlled release of bioactive agents such as growth factors from the fibrous scaffolds improves cell behavior on the scaffolds and accelerates tissue regeneration. In this study, nanofibrous scaffolds were fabricated from biocompatible and biodegradable poly(lactic‐co‐glycolic acid) through the electrospinning technique. Nanofibers with a core–sheath structure encapsulating bovine serum albumin (BSA) as a model protein for hydrophilic bioactive agents were prepared through emulsion electrospinning. The morphology of the nanofibers was evaluated by field‐emission scanning electron microscopy and the core–sheath structure of the emulsion electrospun nanofibers was observed by transmission electron microscopy. The results of the mechanical properties and X‐ray diffraction are reported. The scaffolds demonstrated a sustained release profile of BSA. Biocompatibility of the scaffolds was evaluated using the MTT (3(4,5‐ dimethylthiazol‐2‐yl)‐2,5‐diphenyltetrazolium bromide) assay for NIH‐3T3 fibroblast cells. The results indicated desirable biocompatibility of the scaffolds with the capability of encapsulation and controlled release of the protein, which can serve as tissue engineering scaffolds. © 2013 Society of Chemical Industry 相似文献