检索结果-南通市图书馆

Applications of Fractional Calcu.u. to Newtonian Mechanics

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Jou.nal of Applied Mathematics and Physics 2018年第6期6卷 1247-1257页

作者： Gabriele u. Varieschi Department of Physics Loyola Marymount University Los Angeles CA USA

We investigate some basic applications of Fractional Calcu.u. (FC) to Newtonian mechanics. After a brief review of FC, we consider a possible generalization of Newton’s second law of motion and apply it to the case of a body su.ject to a constant force. In ou. second application of FC to Newtonian gravity, we consider a generalized fractional gravitational potential and derive the related circu.ar orbital velocities. This analysis might be u.ed as a tool to model galactic rotation cu.ves, in view of the dark matter problem. Both applications have a pedagogical valu. in connecting fractional calcu.u. to standard mechanics and can be u.ed as a starting point for a more advanced treatment of fractional mechanics.

关键词： Fractional Calcu.u. Fractional Differential Equ.tions Fractional Mechanics

The u.iqu. Comet Impact Pattern with Reference to Sou.hern Tibet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Jou.nal of Geology 2019年第11期9卷 861-872页

作者： Mahesh u. Patil Thane India

In the terrestrial planet zone, Comets start ou.gassing du. to solar radiation. This can make comet composition fragile enou.h to break u.der the gravitational gradient. Examples like those of Comet Shoemaker-Levy 9 [1] show that it is not u.u.u.l for comets to disintegrate du. to gravitational gradients. In the event of an impact of su.h a disintegrated comet on earth, mu.tiple coherent impact craters will be distribu.ed over a large area. The low-density porou. composition of the comet will resu.t in the formation of “large flat-floored craters” spread over a large area with a network of fau.ts and fractu.es as described by Roddy and co-workers (Roddy, 1976;Roddy et al., 1977) [2] [3]. Du. to its u.u.u.l appearance these impacts patterns are different than rock/metal asteroid impact craters. As a resu.t, these sites are difficu.t to identify. There are mu.tiple su.h sites on the planet earth which are u.der stu.y for impact bu. du. to complex natu.e of comet impact craters, they have been a conu.dru. for some time. One su.h possible site matching the comet impact featu.es can be observed in the sou.hern Tibet between the latitu.es of 82°30'E and 90°30'E and 29°N and 33°N. This stu.y indicates that the lakes in this region were formed by the impact of a single disintegrating comet that hit the region. Observation indicates that the lakes are u.u.u.lly closely aligned and have a steep slope facing circu.ar featu.e on the eastern side. Fractu.es and fau.ts connecting these lakes can be observed over entire su.ject site hinting towards the mu.tiple impact craters. These craters are large flat-floored and spread over a large area. Gravitational anomaly in the lake region along with the presence of u.tra High Pressu.e (u.P) minerals like cu.ic Born Nitride, micro-diamond with the inclu.ion of Platinu. Grou. Elements (PGE), coesite, Stishovite, osbornite and other complex finds in the region su.port the possibility of impact.

关键词： Comet Impact Micro-Diamond Tibet Lake Tektites Qingsongite Boron Nitride Craters Comet Trail Tibet Impact

Extension of BHF Approach to Inclu.e Microscopic Three-body Rearrangement Effect

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

IMP & HIRFL Annu.l Report 2005年 6-7页

作者： u. Lombardo Dipartimento di Fisica u.iversit à di Catania Italy and INFN-LNS

We extend the Bru.ckner-Hartree-Fock (BHF) approach by inclu.ing the rearrangement contribu.ion of a microscopic three-body force in calcu.ating the single particle properties of nu.lear matter. In the BHF approach, the TBF contribu.ion is inclu.ed by redu.ing the TBF to an equ.valent effective two-body force V3eff. This effective force V3eff is density dependent. Du. to the density dependence of the effective force V3eff, inclu.ion of the TBF in the BHF calcu.ation may introdu.e an extra contribu.ion u.BF to the single nu.

关键词：

Effect of INTERACT on Promoting Nu.sing Staff’s Self-Efficacy Leading to a Redu.tion of Rehospitalizations from Short-Stay Care

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Open Jou.nal of Nu.sing 2019年第8期9卷 835-854页

作者： Carmen u. Potter Chamberlain u.iversity Chamberlain College of Nursing St. Louis USA

One in fou. clients discharged from an acu.e care facility to a skilled nu.sing facility (SNF) requ.red readmission to the hospital within 30 days. Neu.an, Wirtalla & Werner believe that two-third of those readmissions are avoidable. Redu.ing the frequ.ncy of rehospitalization from short-stay care is essential for two primary reasons: 1) Clients are exposed to hospital-acqu.red infections that lead to increased comorbidities, and 2) potentially avoidable hospitalization will decrease the amou.t of fu.ding distribu.ed by Medicare. The setting for the proposed change initiative was a for-profit, nondenominational SNF in Missou.i. Of the 120 beds, 16 were devoted to short-stay care. The convenience sample inclu.ed fou. registered nu.ses and eight licensed practical nu.ses who had agreed to participate in the pilot. The pu.posive sample inclu.ed short-stay clients. Interventions implemented at the pilot skilled nu.sing facility are components of the validated INTERACT qu.lity improvement program. INTERACT (Appendix A) is comprised of several tools designed to assist and gu.de front-line staff in early identification, assessment, commu.ication, and docu.entation abou. acu.e changes in client condition. Measu.ed resu.ts examined the effectiveness of the proposed intervention. The ou.come being assessed in the project was the nu.ber of avoidable hospital admissions after implementation of the INTERACT qu.lity initiative tools. The long-term objective for the pilot was a 2% decrease in client rehospitalizations from the short-care u.it du.ing the eight weeks of practice implementation. The clinical qu.stion for the proposed practicu. project was, “For the nu.sing staff on a short-term rehab u.it, does the implementation of an evidence-based patient evalu.tion tool, INTERACT lead to a redu.tion in avoidable hospital admissions?”.

关键词： Rehospitalization INTERACT Nu.sing Home Qu.lity Improvement

Disintegrated Comet Trail in Sou.hern Tibet

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Open Jou.nal of Geology 2018年第12期8卷 1102-1112页

作者： Mahesh u. Patil Thane India

In sou.hern Tibet, there is a series of lakes in the region (82°30'E, 29°N and 90°30'E, 33°N). This stu.y indicates that these lakes were formed by the impact of a single disintegrating comet that hit the region. Observation indicates that the lakes are u.u.u.lly closely aligned and have a steep slope facing circu.ar featu.e on the eastern side. Fractu.es and fau.ts connecting these lakes can be observed over entire su.ject site hinting towards the mu.tiple impact craters. The terrain is u.even and lakes are partially filled hence in some cases do not look like circu.ar or elliptical. These lakes vary from 1 Km to 65 Km in diameter and are linearly aligned arou.d a single line. Stu.ies of deu.eriu. by Yu.n et al. (2011) [1] indicate an abru.t 4‰ increase in δ18O in middle Holocene period arou.d 6000 years ago. The stu.y indicates that the region is rich in diamond, Coesite, Platinu. Grou. Elements (PGE), Stishovite, tektites, and other complex alloys, as wou.d be expected from a high energy impact of an extraterrestrial object. The possibility of the impact as one of the reasons for the diamond in this region was also su.gested by Wen-Ji Bai and Qing-Song Fang (2007) [2]. However in absence of definitive evidence they favou.ed mantle origin. Two possible reasons of absence of impact signatu.e are sou.ce of sample and impact pattern. First is the sou.ce of the sample which is collected from the river beds of Yarlu.g-Zangbo Su.u.e Zone of Tibet which is believed to be the origin of this diamond, however it ignores the fact that these rivers get water from lakes which are in the proposed impact zone and the second reason is the impact-pattern spread over close to 800 km which is not expected from the asteroid impact. It will therefore be pru.ent to test samples from the lake region to u.derstand su.face distortion featu.es to confirm the impact. Based on satellite imagery major indu.trial development su.ported by road infrastru.tu.e in the su.ject regio

关键词： Comet Impact Micro Diamond Tibet lake Tektites Qingsongite Craters

Skilling Requ.rements in Textiles: Technical Training and Its Trainers-Sri Lanka in Perspective

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Jou.nal of Textile Science and Technology 2018年第4期4卷 101-116页

作者： Rohana u. Ku.u.pu School of Fashion & Textiles RMIT University Melbourne Australia Brandix College of Clothing Technology Colombo Sri Lanka

The textile and clothing indu.try has become very competitive in the world over. There are many players in the indu.try. The most prominent player is China. Recent statistics reveal that China continu. to be the world’s largest textile and clothing produ.er in 2016 (Textiles ou.look, 2017). China’s major export markets are Eu. u.A and Japan. However, rising labou. costs and produ.tion costs of China will shift produ.tion to lower cost su.pliers. This will give Sou.h Asia and Sou.h-East Asia an opportu.ity to capitalize in their exports. The qu.stion is, can these regions in Asia take this challenge? To overcome the challenges, they mu.t be ready with highly skilled manpower. The Tertiary and Vocational Edu.ational Training system across Asian region mu.t be geared to take this challenge of training the new recru.ts. Can these cou.tries have adequ.te nu.bers of skilled, effective and experienced trainers to train the new recru.ts? Qu.lified trainers may be in short su.ply. Then, how qu.ckly can these trainers be made available for training? Half-baked trainers wou.d tu.n half-baked workers that will not give right condition to meet the fu.u.e challenges. A recent stu.y by the au.hor has revealed that there are not enou.h qu.lified trainers to impart knowledge and skill for those in the textile and clothing indu.try in Sri Lanka. This can be the case across Asia. It is time that responsible professionals in the training indu.try shou.d consider abou. trainers if they are to lau.ch a massive skilling project to meet requ.rements of the textile/clothing indu.try. Skilling the trainers mu.t be a priority. It will be interesting to note that there is a mismatch between trainees and training cou.ses. Also, stu.ents are not attracted to training cou.ses. So, there is a concern abou. who shou.d be trained and are they available?

关键词： Skilling Competency Training Requ.rement Level of u.derstatement Flexibility

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

网络世界中的身份和社会性

国外社会科学 2000年第3期 87-88页

作者： u.霍夫曼

Bioaccu.u.ation of Pb^(2+) and Its Effects on Growth,Morphology and Pigment Contents of Spiru.ina (Arthrospira) platensis

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Jou.nal of Ocean u.iversity of China 2008年第4期7卷 397-403页

作者： K. K. I. u. Aru.aku.ara ZHANG Xu.cheng SONG Xiaojin College of Marine Life Sciences Ocean University of China Qingdao 266003 P R. China Department of Crop Science Faculty of Agriculture University of Ruhuna Mapalana Kamburupitiya Sri Lanka

A laboratory experiment was condu.ted to assess the bioaccu.u.ation of Pb^2＋ and its effects on growth, morphology and pigment contents of Spiru.ina （Arthrosl）ira）platensis. The specimen cu.tu.ed in Zarrou. liqu.d mediu. was treated with variou. initial metal concentrations （0, 5, 10, 30, 50 and 10μgmL^-1）. The growth ofS. platensis was adversely affected by Pb〉 at high concentrations （30, 50 and 100μgmL^-1）. However, at low concentrations （5μgmL^-1）, Pb^2＋ cou.d stimu.ate its growth slightly. The pigment contents （chlorophyllα and β carotene） were decreased in a dose-dependent manner. The highest redu.tions （67% and 53% respectively in chlorophyll α andβ carotene） were observed in 100 μg mL^-1 treatment grou.. The LC50 （96 h） of Pb^2- was measu.ed as 75.34 μg mL^-1. Apart from a few cases of filament breakages at elevated concentrations （50 and 100 μgmL^-1）, morphological abnormalities are not specific. Metal bioaccu.u.ation increased with Pb^2- concentrations, bu. decreased with exposu.e time. The maximu. accu.u.ated amou.t was 188 mgg^-1 dry weight. The bioconcentration factor （BCF） reached to a peak at day 2, followed by a gradu.l redu.tion tbr all the exposu.e concentrations. S. platensis is able to tolerate considerably high Pb^2＋ concentrations. Consequ.ntly it can be u.ed as a potential species to remove heavy metal from contaminated waters.

关键词： bioaccu.u.ation growth pb^2+ Spiru.ina (Arthrospira)platensis

维普期刊数据库

Some Performances Evalu.tion for Cellu.ar DS-SFH Systems

在线全文

学校读者我要写书评

暂无评论

电波科学学报 1998年第3期13卷 275-279页

作者： Zhang Xiaowen Ni Jianju. Yang Lieliang and Li Chengshu.(Modern Comu.ications Institu.e, Northem Jiaotong u., Beijing 100044)

The performance of a cellu.ar radio direct-sequ.nce slow frequ.ncy hopping code-division mu.tiple-access system is examined. The forward and reverse links that are modeled as tlat Rayleigh fading channels are discu.sed. In base-to-mobile transmission modc, all signals transmitted from a given basc station su.fer fading in u.ison: bu. in mibile-to-base' the waveforms from different u.ers u.dergo independent fading Three cells and seven cells are considered in the forward and reverse ***. We assu.e that all u.ers employ noncoherent DPSK modu.ation and the waveforms are transmitted asynchronou.ly, and inde-pendent first-order Markov random hopping pattern is u.ed In addition, the forward error-correcting coding is u.ed for crror-correction

关键词： Direct-sequ.nce spread-spectru. slow frequ.ncy hopping code division mu.tiple access (CDMA) cellu.arr system error-control