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Search Results: 1 - 10 of 104364 matches for " Jingping Zhang "
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Coating of Mineral Acids with Niobic Solid Acid for Preparing Furfural from Nut Shell of Camellia oleifera Abel  [PDF]
Lisong Hu, Menghao Du, Jingping Zhang
Open Journal of Forestry (OJF) , 2016, DOI: 10.4236/ojf.2016.65037
Abstract: Nut shell of Camellia oleifera Abel which has large scale of plantation in mountainous region of southern China is abundant renewable resource. The nut shell is suitable for preparation of furfural, as the content of which is as much as 16% (based the dried nut shell). In early time, mineral acids were employed as typically catalyst for preparing of furfural from the nut shells. These mineral acids could pollute water and corrode equipment. In this paper we used various mineral acids coating with niobic acid as catalysts to investigate reactions for preparation of furfural. Among these catalysts, the catalyst of sulfuric acid coating with niobic acid was found to be very effective, which had higher hammett acidity and better effect of hydrolysis of the nut shells; The catalysts of sulfuric acid coating with niobic acid was characterized, and the conditions of preparation of the catalyst were investigated. The optimum conditions were: sulfuric acid as coating acid, the concentration of sulfuric 1.1 mol/L, impregnation time 8 h, calcination time 8 h and calcination temperature 450°C. Then hydrolysis of the nut shells was explored, the optimum conditions were as follows: dose of catalyst 20%, ratio of solid to liquid 1:15, reaction temperature 100°C, reaction time 4 h; Under this condition, the yield of furfural was 8.7%.
Physicochemical Properties and Nutritional Ingredients of Kernel Oil of Carya cathayensis Sarg  [PDF]
Lisong Hu, Menghao Du, Jingping Zhang
American Journal of Plant Sciences (AJPS) , 2018, DOI: 10.4236/ajps.2018.912180
Abstract: Carya cathayensis Sarg is distributed near Tianmu mountain areas in Zhejiang Province and Anhui Province, China. Kernel of Carya cathayensis Sarg, which is well-known for the daintiness and nutritional content, is popular and very delicious food in eastern China. In this paper, we investigated the physiochemical properties and nutrient gradients of the kernel oil of Carya cathayensis Sarg. The results showed that the kernel oil of Carya cathayensis Sarg contained 63% of fat, 9.1% of proteins, 3.6% of starch and 4.6% of soluble proteins (based ration of weight). The compositions of the fatty acids were very similar to olive oil, and the total unsaturated fatty acids were 94%. Meanwhile, the kernel oil of Carya cathayensis Sarg also contained some polyphenols such as vanillic acid, ferulic acid, 3-methoxybenzoic acid and quercetin. The content of total polyphenols was 9.7 μg/g. Furthermore, the kernel oil of Carya cathayensis Sarg also contained some trace amount of squalene, β-Sitosterol, Vitamin E.
Chemistry of the Main Component of Essential Oil of Litsea cubeba and Its Derivatives  [PDF]
Lisong Hu, Menghao Du, Jingping Zhang, Yangdong Wang
Open Journal of Forestry (OJF) , 2014, DOI: 10.4236/ojf.2014.45050
Abstract: The tree of Litsea cubeba is widely spread in China, Indonesia and other part of Southeast Asia. The essential oil of Litsea cubeba (EOLC) is obtained by steam distillation from the pepper-like fruits tree Litsea cubeba. The EOLC consists of about 29 active compounds. Among them, citral is the main component; the content of citral is nearly 80% of the EOLC. Due to the special function group, citral is easy to react with many chemicals. Thus, EOLC is usually applied as starting material to carry out aldol condensation, reduction, and six-member ring forming reaction. The EOLC is extensively employed to synthesis of geranal nitriles, pseudonoe, ionone, methyl ionone, Vitamin E and Vitamin A. These products are broadly applied in the fields of fragrance, perfume, medicine and so on. This paper presents comprehensive utilization of EOLC as raw materials to synthesize many active chemicals.
Anti-Fatigue Effect of Blended Camellia oleifera Abel Tea Oil and Ge-132 in Mice  [PDF]
Lisong Hu, Xuezhi Fang, Menghao Du, Jingping Zhang
Food and Nutrition Sciences (FNS) , 2015, DOI: 10.4236/fns.2015.615152
Abstract: Nowadays, people are busier and busier for working and living, and suffer a lot of pressure on their body or mind. Therefore, people are prone to have fatigue activity and decrease their working efficiency and happiness. It was reported that fatigue is a common symptom in the community, with up to half of the general population complaining of fatigue. More and more researchers devoted themselves to studying natural active ingredients in organism as the anti-fatigue drugs to release fatigue symptom. However, these natural ingredients were difficult to obtain from plants, animals and microorganisms by separating and purifying. In addition, some active substances have many side effects. In our study, we employed tea seed oil as main ingredients blended with bis-(carboxyethylgermanium) sesquioxide (Ge-132) to investigate the effects of anti-fatigue on mice by administrating mice with low dose, intermediate dose and high dose of tea seed oil complex for 0, 2 or 4 weeks. The specific tests of studying effects of anti-fatigue were body weight, weight-loaded force swimming, blood urea nitrogen, blood lactic acid and hepaticglycogen. And the results showed that appropriate level of tea seed oil complex could decrease the body weight and prolong the weight-loaded swimming time, and had an active effect on the bloodurea nitrogen, hepatic glycogen and blood lactic acid level mice, which significantly embodied the anti-fatigue activity of tea seed oil complex.
Characteristics of flow production and sediment production of Pinus tabulaeformis through artificial rainfall simulation  [PDF]
Yuli Zhao, Jianzhi Niu, Jiao Li, Jingping Tan, Yini Han, Yinghu Zhang
Open Journal of Ecology (OJE) , 2012, DOI: 10.4236/oje.2012.22009
Abstract: In order to know well the relationship between vegetation and water in North China, especially Beijing, with exceptional water resources, we studied the characteristics of flow production and sediment production under different rainfall intensities by artificial rainfall simulation device. Results showed that increase of rainfall intensity would prolong the whole process of flow production, and vegetation on the slope would delay that process. Within the same duration, total runoff volume of each runoff plot and rainfall intensity had significant linear relationship. When vegetation kept unchanged, runoff velocity increased significantly with the increase of rainfall intensity, and owing to the formation of low permeable layer, the velocity increased fiercely during the early 3 minutes, reached stable at 10 - 15 minute. With the same rain intensity, total sediment yield decreased with rise of vegetation coverage, but increased obviously with rise of rain intensity and effectiveness of controlling sediment about 1 m x 1 m Pinus tabulaeformis stand decreased firstly and then increased, while that about 1.5 m x 1.5 m Pinus tabulaeformis stand kept decreasing. Since the tags with A, B and C for 0.42 mm/min, 0.83 mm/min, 1.29 mm/min, order of sediment concentration of wasteland plot was B > C > A, and 1 m x 1 m Pinus tabulaeformis plot B > A > C. Through this study, some suggestions were expected to be provided for water balance of Beijing area and certain basis for construction of shelter forest.
catena-Poly[[(5-phenyl-2,2′-bipyridine-κ2N,N′)copper(I)]-μ-thiocyanido-κ2N:S]
Shuxin Cui,Minghui Zuo,Jingping Zhang,Yulong Zhao
Acta Crystallographica Section E , 2012, DOI: 10.1107/s1600536812000682
Abstract: The title compound, [Cu(NCS)(C16H12N2)]n, was synthesised under hydrothermal conditions. The CuI ion shows distorted tetrahedral geometry being coordinated by two N atoms from a 5-phenyl-2,2′-bipyridine ligand and by the N and S atoms from two different thiocyanate anions. The CuI ions are bridged by thiocyanide groups, forming a one-dimensional coordination polymer along the b axis. The crystal packing is through van der Waals contacts and C—H...π interactions.
Poly[pentakis(μ-cyanido-κ2N:C)tris(5-phenyl-2,2′-bipyridine-κ2N,N′)pentacopper(I)]
Shuxin Cui,Minghui Zuo,Jingping Zhang,Yulong Zhao
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811045910
Abstract: The hydrothermal reaction of Cu(acetate)2 and K3[Fe(CN)6] with 5-phenyl-2,2′-bipyridine (5-ph-2,2′-bpy) in water yields the polymeric title complex, [Cu5(CN)5(C16H12N2)3]n, which consists of ribbons along the a axis, constructed from 26-membered {Cu10(CN)8} rings. In these rings, the metal atoms are bridged by cyanide groups, except for one close Cu...Cu contact [2.7535 (12) ], which can be considered as ligand-unsupported. Within the rings, one Cu atom has a distorted tetrahedral geometry through the coordination to two N atoms from 5-ph-2,2′-bpy and two N/C atoms from two cyanide groups. Two Cu atoms have a trigonal planar environment being coordinated by three cyanide groups and two other Cu atoms have a distorted square planar geometry through coordination to two N atoms from 5-ph-2,2′-bpy and two N/C atoms from two cyanide groups.
Anti-Hypertensive Effects of Blended Camellia oleifera Abel Oil and Eucommia Extract on SHR Mice  [PDF]
Menghao Du, Lisong Hu, Xuezhi Fang, Jingping Zhang
Open Journal of Forestry (OJF) , 2020, DOI: 10.4236/ojf.2020.101001
Abstract: In our study, we employed Camellia seed oil as the main ingredients blended with Eucommia Extract to investigate the effects of anti-hypertensive on mice by administrating mice with low dose, middle dose and high dose of Camellia seed oil complex for 4 weeks. The specific tests of studying effects of anti-hypertensive were body weight, blood systolic pressure (BSP), diastolic blood pressure (DBP), pm meam blood pressure (MBP) and heart rate (HR). And the results showed that appropriate level of Camellia seed oil complex could decrease the body weight and had an active effect on the cardiovascular system of mice, which significantly embodied the anti-hypertensive activity of Camellia seed oil complex.
Sign-changing solutions to discrete fourth-order Neumann boundary value problems
Jingping Yang
Advances in Difference Equations , 2013, DOI: 10.1186/1687-1847-2013-10
Abstract: By using topological degree theory and fixed point index theory, we consider a discrete fourth-order Neumann boundary value problem. We provide sufficient conditions for the existence of sign-changing solutions, positive solutions, and negative solutions.
Constant sign solutions for second-order m-point boundary-value problems
Jingping Yang
Electronic Journal of Differential Equations , 2013,
Abstract: We will study the existence of constant sign solutions for the second-order m-point boundary-value problem $$displaylines{ u''(t)+f(t,u(t))=0,quad tin(0,1),cr u(0)=0, quad u(1)=sum^{m-2}_{i=1}alpha_i u(eta_i), }$$ where $mgeq3$, $eta_iin(0,1)$ and $alpha_i>0$ for $i=1,dots,m-2$, with $sum^{m-2}_{i=1}alpha_i<1$, we obtain that there exist at least a positive and a negative solution for the above problem. Our approach is based on unilateral global bifurcation theorem.
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