期刊文献+
共找到2,569篇文章
< 1 2 129 >
每页显示 20 50 100
Effects of Non-starch Polysaccharide Enzyme Products on Meat Performance in Broilers 被引量:1
1
作者 CHENG Zhi-bin ZHANG Hong-bing +1 位作者 SU Zi-feng WU Zheng-ming 《Animal Husbandry and Feed Science》 CAS 2011年第3期4-6,共3页
[ Objective] To investigate the effects of non-starch polysaccharide (NSP) enzyme products on meat performance of broilers and thus to provide a scientific basis for their rational use. [Method] Two hundred 21-day-o... [ Objective] To investigate the effects of non-starch polysaccharide (NSP) enzyme products on meat performance of broilers and thus to provide a scientific basis for their rational use. [Method] Two hundred 21-day-old Ross broilers were assigned to five groups. The broilers in group Ⅰ and group Ⅱ were fed positive control diet and negative control diet, respectively, which were slightly different. The broilers in group Ⅲ, Ⅳ and V were fed the negative control diet respectively supplemented with different commercial NSP enzyme products. The broilers were slaughtered at 56 days old, and their meat yield was determined. [ Result] The percentage of carcass yield and percentage of abdominal fat were significantly higher in the group Ⅲ than in the group Ⅱ (P 〈 0.05). The percentage of small intestine weight in slaughter weight was lower in the group Ⅱ than in other groups. [ Conclusion] Diets supplemented broad-rang and highly active NSP enzyme products can promote absorption of routine feed ingredients, increase meat yield, and improve meat performance. 展开更多
关键词 non-starch polysaccharide enzyme products BROILERS Meat performance
下载PDF
Population distribution and threats to sustainable management of selected non-timber forest products in tropical lowland rainforests of south western Nigeria 被引量:1
2
作者 Jimoh S.O. Amusa T.O. I.O. Azeez 《Journal of Forestry Research》 SCIE CAS CSCD 2013年第1期75-82,共8页
Uncontrolled harvesting of non-timber forest products (NTFPs) poses a serious risk of extermination to several of these species in Nigeria. Yet, there is a paucity of information on the distribution, population stat... Uncontrolled harvesting of non-timber forest products (NTFPs) poses a serious risk of extermination to several of these species in Nigeria. Yet, there is a paucity of information on the distribution, population status and sustainable management of NTFPs in most of the tropical lowland rainforests. We, therefore, assessed the population, distribution and threats to sustainable management of NTFPs within the tropical lowland rainforests of Omo and Shasha Forest Reserves, south western Nigeria. Data were obtained through inventory surveys on five top priority species including: bush mango (Irvingia gabonensis (Aubry-Lecomte ex O’Rorke) Baill), African walnut (Tetracarpidium conophorum (Mull. Arg.) Hutch. & Dalziel syn. Plukenetia conophora), chew-stick (Massularia acuminata (G. Don) Bullock), fever bark (Annickia chlorantha Setten & P.J.Maas syn. Enantia chloranta) and bush pepper (Piper guineense Schumach. & Thonn.). Purposive and stratified random sampling techniques were used for the inventory. Each forest reserve was stratified into three, viz: less disturbed natural forest (for areas that have been rested for at least ten years), recently disturbed natural forest (for areas that have suffered one form of human perturbation or the other in the last five years), and plantation forest (for areas carrying forest plantation). Data were collected from eighteen 10 m × 500 m belt transects located in the above strata. The species were generally fewer in both plantation and recently disturbed natural forest than the less disturbed natural forest, suggesting that forest disturbances (habitat modification) for other uses may have an effect on the occurrence and densities of the NTFPs. Exceptions to this trend were found for P. guineense and T. conophorum, which were fairly common in both plantation and recently disturbed natural forest. Among three tree NTFP species (i.e. I. gabonensis, M. acuminata and A. chlorantha), only I. gabonensis showed a significant difference in overall DBH size classes for both reserves (t=?2.404; df =21; p=0.026). Three tree NTFP species in both reserves further showed differences from the regular patterns of distribution of trees. The fairly regular reverse J-shaped size class distribution observed for M. acuminata in the study sites, however, suggests a recuperating population. In general, destructive harvesting of species, logging operations, low population size, narrow distribution ranges and habitat degradation are the major threats to the population of NTFPs in the study area. The implications of our findings for sustainable management of NTFPs in the study area are discussed and recommendations are made for a feasible approach towards enhancing the status of the species. 展开更多
关键词 Tropical rainforest non-timber forest products (NTFP) population density distribution forest management
下载PDF
Diversity of non-timber forest products in Cachar District, Assam, India 被引量:1
3
作者 Shovan Dattagupta Abhik Gupta Manoranjan Ghose 《Journal of Forestry Research》 SCIE CAS CSCD 2014年第2期463-470,共8页
We identified 67 and 21 NTFP-yielding plant and animal species, respectively, in a reserve forest in Cachar district of Assam. We recorded globally threatened species listed by IUCN as Critically Endangered (plant sp... We identified 67 and 21 NTFP-yielding plant and animal species, respectively, in a reserve forest in Cachar district of Assam. We recorded globally threatened species listed by IUCN as Critically Endangered (plant species Dipterocarpus turbinatus), Vulnerable (plant species Aquillaria malaccensis), Endangered (animal species Hoolock hoolock, Indotestudo elongata and Manis pentadactyla), and Vulnerable (animal species Nilssonia hurum and Rusa unicolor). The whole plant or animal and/or their various parts were used as food or medicine, in house construction, magico-religious activities and others. While some NTFPs were harvested throughout the year, others were harvested seasonally. A comprehensive NTFP policy, along with scientific measures for regen- eration, restoration and augmentation of NTFP-yielding plants and animals, would help in addressing the conflicting demands of conservation and livelihood in the forests of this area. 展开更多
关键词 non-timber forest product (NTFP) lndo-Burma biodiversity hotspot ASSAM IUCN red list DIVERSITY threatened taxa
下载PDF
Actuality research on base of non-pollution agricultural products in Yilan county
4
作者 ZHOU Jun LIU Jianping +1 位作者 BAI Xin ZHANG Ying 《Journal of Northeast Agricultural University(English Edition)》 CAS 2007年第4期337-339,共3页
The base of non-pollution agricultural products is a prerequisite for the non-pollution agricultural production. Based on two factors, i.e., irrigation water and soil, the environmental quality of Yilan county's base... The base of non-pollution agricultural products is a prerequisite for the non-pollution agricultural production. Based on two factors, i.e., irrigation water and soil, the environmental quality of Yilan county's base of non-pollution agricultural products was evaluated by single pollution index. The main monitoring items included the content of Hg, Se, Cr, Pb, fluoride, and so on, and the evaluating results showed Pi〈1 which indicated that this area was fit for developing not only non-pollution products but also greenfood of A level. 展开更多
关键词 non-pollution agricultural product environmental quality Yilan county single pollution index greenfood
下载PDF
Theoretical assessment of hydrogen production and multicycle energy conversion via solar thermochemical cycle based on nonvolatile SnO2 被引量:2
5
作者 Mingkai Fu Huajun Xu +1 位作者 Haitao Ma Xin Li 《Journal of Energy Chemistry》 SCIE EI CAS CSCD 2019年第11期177-184,共8页
A kind of solar thermochemical cycle based on methanothermal reduction of SnO2 is proposed for H2 and CO production. We find that the oxygen release capacity and thermodynamic driven force for methanothermal reduction... A kind of solar thermochemical cycle based on methanothermal reduction of SnO2 is proposed for H2 and CO production. We find that the oxygen release capacity and thermodynamic driven force for methanothermal reduction of SnO2 are large, and suggest CH4 :SnO2 = 2:1 as the feasible reduction condition for achieving high purities of syngas and avoiding vaporization of produced Sn. Subsequently, the amount of H2 and energetic upgrade factors under different oxidation conditions are compared, in which excess water vapor is found beneficial for hydrogen production and fuel energetic upgradation. Moreover, the effect of incom plete recovery of SnO2 on the subsequent cycle is underscored and explained. After accounting for factors such as isothermal operation and cycle stability, CH4 :SnO2 = 2:1 and H2O:Sn = 4:1 are suggested for highest solar-to-fuel efficiency of 46.1% at nonisothermal condition, where the reduction and oxidation temperature are 1400 and 600 K, respectively. 展开更多
关键词 SnO2/Sn based solar-chemical cycle Hydrogen productION non-volatile redox Isothermal and nonISOTHERMAL operation SYNGAS productION
下载PDF
Optimization of post-warranty sequential inspection for second-hand products 被引量:1
6
作者 Dae-Kyung Kim Jae-Hak Lim Dong Ho Park 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2017年第4期793-800,共8页
This paper considers an optimal sequential inspection schedule for a second-hand product after that the free nonrenewable warranty is expired. The length of warranty is prespecified and during the warranty period, the... This paper considers an optimal sequential inspection schedule for a second-hand product after that the free nonrenewable warranty is expired. The length of warranty is prespecified and during the warranty period, the product is minimally repaired by the dealer when it fails. Following the expiration of the non-renewing warranty, the product is inspected and upgraded sequentially a fixed number of times at the expenses of the customer.At each inspection, the failure rate of the product is reduced proportionally so that the product is upgraded. The product is assumed to deteriorate as it ages and the replacement of the product occurs when a fixed number of inspections are rendered. In addition,the intervals between two successive inspections are assumed to decrease monotonically. The main objective of this paper is to determine the optimal improvement level to upgrade the product at each inspection so that the expected maintenance cost during the life cycle of the product is minimized from the perspective of the customer. Under the given cost structures, we derive an explicit formula to obtain the expected maintenance cost incurred during the life cycle of the product and discuss the method to find the optimal level of the improvement analytically in case the failure times follow the Weibull distribution. Numerical results are analyzed to observe the impact of relevant parameters on the optimal solution. 展开更多
关键词 second-hand product sequential inspection upgrade action life cycle of the product expected maintenance cost free non-renewable warranty
下载PDF
COMPACTLY SUPPORTED NON-TENSOR PRODUCT FORM TWO-DIMENSION WAVELET FINITE ELEMENT 被引量:2
7
作者 金坚明 薛鹏翔 +1 位作者 徐应祥 朱亚莉 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2006年第12期1673-1686,共14页
Some theorems of compactly supported non-tensor product form two-dimension Daubechies wavelet were analysed carefully. Compactly supported non-tensor product form two-dimension wavelet was constructed, then non-tensor... Some theorems of compactly supported non-tensor product form two-dimension Daubechies wavelet were analysed carefully. Compactly supported non-tensor product form two-dimension wavelet was constructed, then non-tensor product form two dimension wavelet finite element was used to solve the deflection problem of elastic thin plate. The error order was researched. A numerical example was given at last. 展开更多
关键词 compactly supported non-tensor product two-dimension wavelet interpolation function elastic thin plate DEFLECTION finite element
下载PDF
The development and application of premium thread connection tubing and casing products from Baosteel
8
作者 Wang Li ZhaoYong'an 《Baosteel Technical Research》 CAS 2008年第2期16-20,共5页
Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injecti... Premium thread connection tubing and casing products are non-API products that are used in severe oil field conditions, such as deep wells ,ultra deep wells, high pressure gas wells, horizontal wells and steam injection wells, etc. In order to meet the requirements of oilfields for premium thread connection oil country tubular goods ( OCTG), Baosteel developed its own series of premium thread connection tubing and casing products that are protected by intellectual property rights. This study introduces the process of developing the premium thread connection tubing and casing products, their characteristics, and their actual application in oil fields. It hopes to give customers a better understanding of Premium thread connection tubing and casing products from Baosteel. 展开更多
关键词 premium thread connection non-API products OCTG
下载PDF
Potential Applications of Milk Fractions and Valorization of Dairy By-Products: A Review of the State-of-the-Art Available Data, Outlining the Innovation Potential from a Bigger Data Standpoint 被引量:3
9
作者 Serge Rebouillat Salvadora Ortega-Requena 《Journal of Biomaterials and Nanobiotechnology》 2015年第3期176-203,共28页
The unique composition of milk makes this basic foodstuff into an exceptional raw material for the production of new ingredients with desired properties and diverse applications in the food industry. The fractionation... The unique composition of milk makes this basic foodstuff into an exceptional raw material for the production of new ingredients with desired properties and diverse applications in the food industry. The fractionation of milk is the key in the development of those ingredients and products;hence continuous research and development on this field, especially various levels of fractionation and separation by filtration, have been carried out. This review focuses on the production of milk fractions as well as their particular properties, applications and processes that increase their exploitation. Whey proteins and caseins from the protein fraction are excellent emulsifiers and protein supplements. Besides, they can be chemically or enzymatically modified to obtain bioactive peptides with numerous functional and nutritional properties. In this context, valorization techniques of cheese-whey proteins, by-product of dairy industry that constitutes both economic and environmental problems, are being developed. Phospholipids from the milk fat fraction are powerful emulsifiers and also have exclusive nutraceutical properties. In addition, enzyme modification of milk phospholipids makes it possible to tailor emulsifiers with particular properties. However, several aspects remain to be overcome;those refer to a deeper understanding of the healthy, functional and nutritional properties of these new ingredients that might be barriers for its use and acceptability. Additionally, in this review, alternative applications of milk constituents in the non-food area such as in the manufacture of plastic materials and textile fibers are also introduced. The unmet needs, the cross-fertilization in between various protein domains,the carbon footprint requirements, the environmental necessities, the health and wellness new demand, etc., are dominant factors in the search for innovation approaches;these factors are also outlining the further innovation potential deriving from those “apparent” constrains obliging science and technology to take them into account. 展开更多
关键词 MILK product MILK Fractionation Casein Phospholipid WHEY Protein non-FOOD Application VALORIZATION Enzyme Modification Bioactive Peptides BIGGER DATA Innovation: Closed Open Collaborative Disruptive Inclusive Nested
下载PDF
Pair Production in Non-Perturbative QCD
10
作者 Salah Hamieh 《Journal of Modern Physics》 2014年第6期402-406,共5页
In this paper, a method to calculate the vacuum to vacuum transition amplitude in the presence of a non-abelian background field is introduced. The number of non-perturbative quark-antiquark produced per unit time, pe... In this paper, a method to calculate the vacuum to vacuum transition amplitude in the presence of a non-abelian background field is introduced. The number of non-perturbative quark-antiquark produced per unit time, per unit volume and per unit transverse momentum from a given constant chromo-electric field is calculated and its application to quark-gluon plasma is presented. 展开更多
关键词 PAIR productION non-PERTURBATIVE QCD
下载PDF
Non-professional Agricultural Production Villages Establishing a New Rural Cooperative
11
作者 ZHANG Yue-xiang,DING Jing Department of Ideological and Political Theory Course,North China Electric Power University,Baoding 071003,China 《Asian Agricultural Research》 2010年第10期50-53,56,共5页
The article analyzes problems in the agricultural development of non-professional agricultural production villages of Fenghua City.Firstly,low technical and scientific content of production and low standardization lev... The article analyzes problems in the agricultural development of non-professional agricultural production villages of Fenghua City.Firstly,low technical and scientific content of production and low standardization level.Secondly,scattered sales and non-fixed marketing channels.Thirdly,difficulties in group cooperation of farm crops with special benefits.Fourthly,imperfect service of rural committees of non-professional agricultural production villages in Fenghua City.A new rural cooperative is to be founded to help villagers in non-professional agricultural production villages of Fenghua City to be engaged in agricultural production and management activities,and to improve their overall incomes.On the one hand,a perfect and scientific cooperative operating system is to be built specifically including three functions.Firstly,fully playing the leading and bridging role of rural primary organizations.Secondly,fully carrying out the pushing role of capable persons in the administrative village.Lastly,fully playing the role of active participation and cooperation of villagers.On the other hand,constructions of normalization,standardization and brand orientation with special emphasis should be achieved under the guidance of local governments.The key of building a cooperative of non-professional agricultural production villages in Fenghua City is discussed.One is that rural cadres should have strong awareness of serving the people.The other is that governments at all levels should energetically support the establishment and management of rural cooperatives. 展开更多
关键词 Fenghua CITY non-professional AGRICULTURAL product
下载PDF
Sensitivity of the Product System of Set-Valued Non-Autonomous Discrete Dynamical Systems
12
作者 Yongxi Jiang Tianxiu Lu +1 位作者 Jingmin Pi Xiaofang Yang 《Journal of Applied Mathematics and Physics》 2021年第11期2706-2716,共11页
This paper is concerned with the sensitivity of set-valued discrete systems. Firstly, this paper obtained the equivalence between <img src="Edit_7024f70b-0568-4ca8-a554-c0d05abc0df0.bmp" alt="" ... This paper is concerned with the sensitivity of set-valued discrete systems. Firstly, this paper obtained the equivalence between <img src="Edit_7024f70b-0568-4ca8-a554-c0d05abc0df0.bmp" alt="" />or <img src="Edit_95636a59-7d5d-4b6c-8bd5-f699dd9208df.bmp" alt="" /> and the product system <img src="Edit_c714caaf-0ed9-46bc-b3e1-b0223474a8f5.bmp" alt="" /> in sensitivity, infinite sensitivity, <em>F</em>-sensitivity, (<em>F</em><sub>1</sub>, <em>F</em><sub>2</sub>)-sensitivity. Then, the relation between (<em>X</em>, <em>f</em><sub>1,∞</sub>) or (<em>Y</em>, <em>g</em><sub>1,∞</sub>) and <img src="Edit_55b4ce47-89f3-4476-a8a8-4d4db5a4e8eb.bmp" alt="" /> in ergodic sensitivity is obtained. Where <img src="Edit_a99604c4-2f72-4e75-a998-8057b8790e03.bmp" alt="" /> is the set-valued dynamical system induced by a non-autonomous discrete dynamical system (<em>X</em>, <em>f</em><sub>1,∞</sub>). 展开更多
关键词 Sensitivity Set-Valued System product Mapping non-Autonomous Systems
下载PDF
Computing the Full Non-Rigid Group of Trimethylborane and Cyclohaxane Using Wreath Product
13
作者 Enoch Suleiman M. S. Audu 《American Journal of Computational Mathematics》 2020年第1期23-30,共8页
This paper computes the group and character table of Trimethylborane and Cyclohaxane. Results show that the groups are isomorphic to the wreath products C3wrC2 and C2wrC6 with orders 81 and 384 and with 17 and 28 conj... This paper computes the group and character table of Trimethylborane and Cyclohaxane. Results show that the groups are isomorphic to the wreath products C3wrC2 and C2wrC6 with orders 81 and 384 and with 17 and 28 conjugacy classes respectively, where Cn denotes a cyclic group of order n. 展开更多
关键词 non-RIGID MOLECULE GROUP Trimethylborane Cyclohaxane Wreath product CHARACTER TABLE CONJUGACY Classes
下载PDF
Exploiting Virtual Elasticity of Production Systems to Respect OTD—Part 3: Basic Considerations for Modelling CPPS Characterized by Non-Ergodic Order Entry and Non-Deterministic Product-Mix for Fully Flexible Addressable Workstations
14
作者 Bruno G. Rüttimann Martin T. Stöckli 《American Journal of Operations Research》 2022年第2期19-63,共45页
The recently experienced hype concerning the so-called “4<sup>th</sup> Industrial Revolution” of production systems has prompted several papers of various subtopics regarding Cyber-Phdysical Production S... The recently experienced hype concerning the so-called “4<sup>th</sup> Industrial Revolution” of production systems has prompted several papers of various subtopics regarding Cyber-Phdysical Production Systems (CPPS). However, important aspects such as the modelling of CPPS to understand the theory regarding the performance of highly non-ergodic and non-deterministic flexible manufacturing systems in terms of Exit Rate (ER), Manufacturing Lead Time (MLT), and On-Time Delivery (OTD) have not yet been examined systematically and even less modeled analytically. To develop the topic, in this paper, the prerequisites for modelling such systems are defined in order to be able to derive an explicit and dedicated production mathematics-based understanding of CPPS and its dynamics: switching from explorative simulation to rational modelling of the manufacturing “physics” led to an own and specific manufacturing theory. The findings have led to enouncing, among others, the Theorem of Non-Ergodicity as well as the Batch Cycle Time Deviation Function giving important insights to model digital twin-based CPPS for complying with the mandatory OTD. 展开更多
关键词 On-Time-Delivery production System Industry 4.0 CPPS IoT Stochastic Arrival Rate non-Ergodic Process Virtual Elasticity production Capacity Nominal Mean Exit Rate Theorem of non-Ergodicity non-Deterministic product-Mix TFL AGV Scheduling Algorithm Digital Twin
下载PDF
Dynamic Promotional Resource Allocation for Segment Specific and Spectrum Effect of Promotion for a Product Line Incorporating Repeat Purchase Behavior 被引量:1
15
作者 Prakash Chandra Jha Prerna Manik Anshu Gupta 《American Journal of Operations Research》 2013年第3期350-362,共13页
Promotion is an essential element in the marketing mix. It is used by businesses to inform, influence and persuade customers to adopt the products and services they offer. Without promotion, business would be stagnant... Promotion is an essential element in the marketing mix. It is used by businesses to inform, influence and persuade customers to adopt the products and services they offer. Without promotion, business would be stagnant and lack substantial growth because the brands would have low visibility in the market. Moreover, today’s vast and assorted markets comprise of customers with different needs and varied behavior. So it is rarely possible for companies to satisfy all customers by treating them alike. Thus there arises a need to divide the market into segments having customers with similar traits/characteristics. After identifying appropriate market segments, firms can design differentiated promotional campaigns for each segment. At the same time there can be a mass market promotional campaign that reaches different segments with a fixed spectrum. Also since promotional effort resources are limited, one must use them judiciously. In this paper, we formulate mathematical programming problem under repeat purchase scenario, which optimally allocates mass promotional effort resources and differentiated promotional effort resources across the segments dynamically in order to maximize the overall sales obtained from multiple products of a product line under budgetary and minimum sales aspiration level constraint on each product under consideration in each segment. The planning horizon is divided into multi periods, the adoption pattern of each product in each segment is observed in every subinterval and accordingly promotional effort allocations are determined for the next period till we reach the end of planning period. The optimization model has been further extended to incorporate minimum aspiration level constraints on total sales for each product under consideration from all the segments taken together. The non linear programming problem so formulated is solved using differential evolution approach. A numerical example has been discussed to illustrate applicability of the model. 展开更多
关键词 MARKET Segmentation DIFFERENTIATED MARKET PROMOTION Mass MARKET PROMOTION SPECTRUM EFFECT Promotional Effort Allocation REPEAT Purchase product Line non Linear Programming Problem Differential Evolution
下载PDF
Heat Production Rate Calculation of Thermal Manikin with a Compensation Method
16
作者 朱利军 张渭源 +1 位作者 陈文飞 陈景山 《Journal of China Textile University(English Edition)》 EI CAS 2000年第1期79-81,共3页
Thermal manikin plays important roles in simulating thethermal state of human bodies to facilitate the evaluationof thermal comfort properties of various clothing assem-blies.Based on the heat balance principle and an... Thermal manikin plays important roles in simulating thethermal state of human bodies to facilitate the evaluationof thermal comfort properties of various clothing assem-blies.Based on the heat balance principle and analysis ofrelated factors,the heat production rate of manikin isrecommended as an efficient evaluation index.Whereas,its inside heat production which occurs as a result of theexistence of temperature difference between its insidepart and outside surface,should not be ignored.Through a series of theoretical analysis and calculations,a compensative equation is deduced in this paper. 展开更多
关键词 thermal MANIKIN HEAT balance non - evapora-tive HEAT loss HEAT productION RATE INNER HEAT productION RATE CALCULATION compensation.
下载PDF
基于non-local先验的贝叶斯变量选择方法及其在高维数据分析中的应用
17
作者 马金沙 董晓强 +4 位作者 高倩 陶然 许树红 李艳艳 王彤 《中国卫生统计》 CSCD 北大核心 2020年第3期372-377,383,共7页
目的对高维数据进行变量筛选并构建预测模型是组学数据分析的研究热点之一。本研究旨在为结局为二分类变量的高维组学数据筛选自变量并构建预测结局的稀疏统计模型。方法本研究通过模拟研究和实例分析阐释基于non-local先验的贝叶斯变... 目的对高维数据进行变量筛选并构建预测模型是组学数据分析的研究热点之一。本研究旨在为结局为二分类变量的高维组学数据筛选自变量并构建预测结局的稀疏统计模型。方法本研究通过模拟研究和实例分析阐释基于non-local先验的贝叶斯变量选择方法--乘积逆矩先验(product inverse moment,piMOM)相较于惩罚类方法ISIS-光滑平切绝对偏差(iterative sure independence screening-smoothly clipped absolute deviation,ISIS-SCAD)和ISIS-最小最大凹惩罚(iterative sure independence screening-minimax concave penalty,ISIS-MCP)在高维数据中变量筛选及其预测效果的性能优劣。结果模拟研究发现:在高维的情况下,经piMOM、ISIS-SCAD和ISIS-MCP方法筛选所得变量的平均真阳性数和受试者工作特征曲线下面积(AUC,area under curve)基本相等,ISIS-SCAD、ISIS-MCP的平均假阳性数、回归系数均方误差以及预测均方误差明显高于基于non-local先验的贝叶斯变量方法所获得的对应值。piMOM方法分析弥漫大B细胞淋巴瘤实例数据共识别5个有意义的基因,AUC为0.996;ISIS-SCAD识别7个基因,AUC为0.975;ISIS-MCP识别7个基因,AUC为0.968。结论在模型选择相合性和预测准确性方面,piMOM方法与ISIS-SCAD和ISIS-MCP相比,具有优势,在一定意义上可有效控制假阳性率。 展开更多
关键词 高维数据 贝叶斯变量选择方法 non-local先验 乘积逆矩先验 弥漫性大B细胞淋巴瘤
下载PDF
Pancreatic Carcinoma with Prominent Mucin Production: A Clinicopathologic and Immunohistochemical Study of 9 Cases 被引量:4
18
作者 Makoto Saito Hiroshi Nishihara +5 位作者 Mishie Tanino Taichi Kimura Yoshihiro Matsuno Kazuo Nagashima Michio Shimizu Shinya Tanaka 《Open Journal of Pathology》 2012年第2期15-20,共6页
Pancreatic carcinoma occasionally associated with prominent mucin production and this type of tumor designated as PCM (pancreatic carcinoma with prominent mucin production) was diagnosed depends on subjective estimati... Pancreatic carcinoma occasionally associated with prominent mucin production and this type of tumor designated as PCM (pancreatic carcinoma with prominent mucin production) was diagnosed depends on subjective estimation of the amount of mucous area, and there has been no report on a quantitative evaluation of the amount of mucinous area in the tumor. To examine the feature of PCM, we analyzed 9 cases of PCM among 243 cases of pancreas carcinoma and evaluated the amount of mucin by imaging analysis. Morphologically, 5 cases were classified as intradactal papillary mucinous neoplasms (IPMN)-derived PCM and 4 cases were as ductal adenocarcinoma (DA)-derived PCM. Mucous composition was found to be more than 50% in all IPMN-derived PCM cases, and that was 40% - 50% in DA-derived PCM cases with one exception. IPMN-derived PCM cases showed expansive growth with pancreatic duct dilatation filled with mucin, while DA-derived PCM cases possessed mucin infiltration into interstitial tissue. Immunohisto-chemically, three of 4 DA-derived PCM cases were MUC1(–)/MUC2(+), and the results of expressions for p16 and Dpc4 suggesting that DA-derived PCM was similar to IPMN-derived PCM rather than ordinary DA. Survival rate of DA-derived PCM cases was lower than that of IPMN-derived PCM cases. We advocate that DA-derived PCM may constitute a borderline group between IPMN and ordinary DA. 展开更多
关键词 Pancreatic CARCINOMA with Prominent MUCIN productION (PCM) MUCINOUS non-Cystic CARCINOMA (MNCC) INTRADUCTAL Papillary MUCINOUS Neoplasm (IPMN) Ductal Adenocarcinoma (DA) Immunohistochemistry
下载PDF
SEPARATION OF WIDE-RANGE DNA FRAGMENTS USING NON-GEL CAPILLARY ELECTROPHORESIS
19
作者 Zhao Tao Liu Qiping Cheng Jieke 《Wuhan University Journal of Natural Sciences》 CAS 1998年第1期128-128,共1页
关键词 non-gel capillary electrophoresis DNS fragments PCR product
下载PDF
Yield models for predicting aboveground ectomycorrhizal fungal productivity in Pinus sylvestris and Pinus pinaster stands of northern Spain
20
作者 Mariola Sánchez-González Sergio de-Miguel +6 位作者 Pablo Martin-Pinto Fernando Martínez-Pe?a María Pasalodos-Tato Juan Andrés Oria-de-Rueda Juan Martínez de Aragón Isabel Ca?ellas José Antonio Bonet 《Forest Ecosystems》 SCIE CSCD 2019年第4期414-426,共13页
Background: Predictive models shed light on aboveground fungal yield dynamics and can assist decision-making in forestry by integrating this valuable non-wood forest product into forest management planning. However, t... Background: Predictive models shed light on aboveground fungal yield dynamics and can assist decision-making in forestry by integrating this valuable non-wood forest product into forest management planning. However, the currently existing models are based on rather local data and, thus, there is a lack of predictive tools to monitor mushroom yields on larger scales.Results: This work presents the first empirical models for predicting the annual yields of ectomycorrhizal mushrooms and related ecosystem services in Pinus sylvestris and Pinus pinaster stands in northern Spain, using a long-term dataset suitable to account for the combined effect of meteorological conditions and stand structure.Models were fitted for the following groups of fungi separately: all ectomycorrhizal mushrooms, edible mushrooms and marketed mushrooms. Our results show the influence of the weather variables(mainly precipitation) on mushroom yields as well as the relevance of the basal area of the forest stand that follows a right-skewed unimodal curve with maximum predicted yields at stand basal areas of 30–40 m2·ha-1.Conclusion: These models are the first empirical models for predicting the annual yields of ectomycorrhizal mushrooms in Pinus sylvestris and Pinus pinaster stands in northern Spain, being of the highest resolution developed to date and enable predictions of mushrooms productivity by taking into account weather conditions and forests’ location, composition and structure. 展开更多
关键词 MUSHROOMS FUNGI non-wood forest products Mixed models Hurdle models
下载PDF
上一页 1 2 129 下一页 到第
使用帮助 返回顶部