bluuebunny/crossref_metadata_2025_split huggingface dataset:
Dickblechclinchen – Innovatives Fügeverfahren für den Stahlbau
Authors: Israel Markus , Jesche Fred , Mauermann Reinhard , Trojer Andreas 
Published: June 2010

AbstractDas auch unter dem Begriff Durchsetzfügen bekannte Clinchen ist eine Fügetechnologie, welche sich vor allem in den Bereichen der Automobilindustrie sowie der Geräte‐ und Elektroindustrie etabliert hat. Eine Vielzahl von Untersuchungen und Beispielen aus der industriellen Anwendung belegt die Universalität und Wirtschaftlichkeit, eine einfache Handhabbarkeit sowie die gute Automatisierbarkeit dieses Fügeverfahrens. Der Einsatz des Clinchens beschränkt sich zurzeit jedoch hauptsächlich auf den Feinblechbereich in den genannten Industriezweigen. Untersuchungen am Fraunhofer IWU zeigen, dass dieses hochgradig ökonomische und innovative Verfahren auch eingesetzt werden kann, wenn deutlich größere Blechdicken zu verbinden sind. Ein Einsatz im Schienenfahrzeug‐, Schiff‐ und Stahlbau sowie dem Nutzfahrzeugbau ist in naher Zukunft vorstellbar und aufgrund der besonderen Eigenschaften der Technologie erstrebenswert. Die Übertragung des Know‐how aus dem automobiltypischen Blechdickenbereich auf die Materialstärken im Stahlbau sowie die numerisch unterstützte Systementwicklung sind Schwerpunkte von Forschungsaktivitäten am Fraunhofer IWU.Clinching of thick sheets – innovative joining technology for steelwork. Clinching, which is mechanical joining by upsetting, is above all established in the area of automotive industry as well as in appliance and electronic industry. The universality, economic efficiency, an easy manageability and the fact that the process is good automatable are documented by several research activities. Currently the process application is mainly restrained on connections of thin sheets in the named sector of industry. Investigations done by Fraunhofer IWU point out the possibility of using this high efficiency and innovative joining technology even for applications with distinctly higher sheet thicknesses. An adoption of clinching is conceivable and desirable for railway vehicle or truck manufacturing and shipbuilding as well as for steelwork generally in near future due to its specific technology characteristics. The transfer of knowledge from the thin sheet automotive sector to the sheet thicknesses used in steelwork as well as the numerical supported system development are focus of the research activities at Fraunhofer IWU.
Chest Radiographs Are Valuable in Demonstrating Clinically Significant Pacemaker Complications that Require Reoperation
Authors: Belvin Diane , Hirschl David , Jain Vineet R. , Godelman Alla , Stein Marjorie W. , Gross Jay N. , Haramati Linda B. 
Published: June 2010

Purpose To evaluate the utility of chest radiography in demonstrating clinically significant pacemaker complications that required reoperation. Methods In this retrospective case-controlled series, we identified 14 consecutive adults who required pacemaker reoperation and who had chest radiographs available for review (6 men, 8 women; mean age, 71 years [range, 43–95 years]). Ten patients had pacemakers implanted at our institution, and 4 were referred for reoperation. Forty-two controls, 3 for each patient, had postoperative chest radiographs and normal device function (25 men, 17 women; mean age 76 years [range, 37–96 years]). All postoperative chest radiographs, including 1-year follow-ups, were blindly reviewed by at least 2 of 4 radiologists for lead perforation and position of right atrial and right ventricular leads. Follow-up radiographs were assessed for lead perforation, lead displacement, and lead fracture. Data were analysed by using the Fisher exact test. Results Of the patients, 1.7% (10/581) required reoperation for pacemaker dysfunction (noncapture, oversensing, abnormal atrial and ventricular thresholds, failing impedance), extracardiac stimulation, and lead perforation and/or displacement. There were no lead fractures. Chest radiographs demonstrated pacemaker complications in 57% of patients (8/14) at a median of 2 days (<1–32 days) after implantation and in 5% of the controls (2/42) ( P < .0001). None of the abnormalities were noted on the official reports. Among subgroups, chest radiographs were abnormal for the following indications: pacemaker dysfunction in 4 of 7 patients versus 0 of 21 controls ( P = .0017), extracardiac stimulation in 1 of 3 patients vs 0 of 9 controls ( P = .25), and lead perforation and/or displacement in 3 of 4 patients vs 2 of 12 controls ( P = .06). Conclusions Chest radiographs are useful after pacemaker placement and demonstrate the majority of complications that require reoperation. Familiarity with the expected normal position of the leads, appearances of pacemaker complications, and comparison with prior radiographs is crucial in rendering a correct diagnosis that guides patient management.
“Active Labor” Duration and Dilation Rates Among Low‐Risk, Nulliparous Women With Spontaneous Labor Onset: A Systematic Review
Authors: Neal Jeremy L. , Lowe Nancy K. , Ahijevych Karen L. , Patrick Thelma E. , Cabbage Lori A. , Corwin Elizabeth J. 
Published: June 2010

Introduction: Laboring women are often admitted to labor units under criteria that are commonly associated with the onset of active‐phase labor (i.e., cervical dilatation of 3–5 cm in the presence of regular contractions). Beginning with these criteria through complete dilatation, this systematic review describes labor duration and cervical dilation rates among low‐risk, nulliparous women with spontaneous labor onset.Methods: Studies published in English (between 1990 and 2008) were identified via MEDLINE and CINAHL searches. Data were abstracted and weighted “active labor” durations (i.e., from 3–5 cm through complete dilatation) and linear dilation rates were calculated.Results: Eighteen studies (n = 7009) reported mean “active labor” duration. The weighted mean duration was 6.0 hours, and the calculated dilation rate was 1.2 cm per hour. These findings closely parallel those found at the median. At the statistical limits, the weighted “active labor” duration was 13.4 hours (mean + 2 standard deviations) and the dilation rate was 0.6 cm per hour (mean − 2 standard deviations).Discussion: These findings indicate that nulliparous women with spontaneous labor onset have longer “active” labors and therefore slower dilation rates than are traditionally associated with active labor when commonly used criteria are applied as the starting point. Revision of existing active labor expectations and/or criteria used to prospectively identify active phase onset is warranted.
The Effects of Perceived Stress and Attitudes Toward Menopause and Aging on Symptoms of Menopause
Authors: Nosek Marcianna , Kennedy Holly Powell , Beyene Yewoubdar , Taylor Diana , Gilliss Catherine , Lee Kathryn 
Published: June 2010

Introduction: As part of a longitudinal study of midlife women, the aim of this investigation was to describe the intensity of menopausal symptoms in relation to the level of perceived stress in a woman's life and her attitudes toward menopause and aging.Methods: Data were collected on 347 women between 40 and 50 years of age in Northern California who began the study while premenopausal. Women self‐identified as African American, European American, or Mexican/Central American. Data collected over three time points in the first 12 months were used for this analysis. An investigator‐developed tool for the perception of specific types of stress was used. Attitudes toward menopause and aging were measured using the Attitudes Toward Menopause and Attitude Toward Aging scales. Attitudes toward aging and menopause, perceived stress, and income were related to intensity of symptoms.Results: There was no ethnic group difference in perceived stress or attitude toward menopause. However, European and African Americans had a more positive attitude toward aging than Mexican/Central Americans.Discussion: A lower income, higher perceived stress, a more negative attitude toward aging, and a more positive attitude toward menopause influenced menopausal symptom experience.
The Use of Complementary and Alternative Medicines Among a Sample of Canadian Menopausal‐Aged Women
Authors: Lunny Carole A. , Fraser Shawn N. 
Published: June 2010

Introduction: Despite questionable efficacy and safety, many women use a variety of complementary and alternative medicine (CAM) therapies to relieve menopause symptoms.Methods: We examined the determinants and use of CAM therapies among a sample of menopausal‐aged women in Canada by using a cross‐sectional Web‐based survey.Results: Four hundred twenty‐three women who were contacted through list serves, e‐mail lists, and Internet advertisements provided complete data on demographics, use of CAM, therapies, and menopausal status and symptoms. Ninety‐one percent of women reported trying CAM therapies for their symptoms. Women reported using an average of five kinds of CAM therapies. The most common treatments were vitamins (61.5%), relaxation techniques (57.0%), yoga/meditation (37.6%), soy products (37.4%), and prayer (35.7%). The most beneficial CAM therapies reported were prayer/spiritual healing, relaxation techniques, counseling/therapy, and therapeutic touch/Reiki. Demographic factors and menopausal symptoms contributed to 14% of the variance (P < .001) in the number of CAM therapies tried.Discussion: Results support previous research showing that menopausal women have high user rates of CAM therapy and show that specific demographic factors and somatic symptomatology relate to use of CAM therapies. Health care providers can benefit from understanding the determinants and use of CAM by women during the menopause transition if they are to help and provide quality care for this population.
A study on phytoplankton following ‘Volgoneft-248’ oil spill on the north-eastern coast of the Sea of Marmara
Authors: Taş Seyfettin , Okuş Erdoğan , Ünlü Selma , Altiok Hüsne 
Published: June 2010

Following the ‘Volgoneft-248’ oil spill, phytoplankton distribution within the affected area was investigated for two years. Simultaneously measured physical variables such as salinity, temperature, Secchi disc, current speed and direction, and total petroleum hydrocarbons (TPH) were evaluated together with phytoplankton data. At the time of the accident, the TPH concentration in surface water was measured as 2.17 mg l−1and decreased to 88.5 µg l−1after five days. In the first sampling period, no diatoms were detected in surface water, while dinoflagellates were dominant in the phytoplankton community. The species composition of phytoplankton changed rapidly in two months and the diatoms increased in terms of abundance and diversity. This indicated that the diatoms might be more sensitive to oil pollution than the dinoflagellates. In comparison with the historical datasets, the low phytoplankton abundance following the oil spill should be considered as the small effect of oil on the phytoplankton rather than natural variability of the ecosystem. High oil concentration in the water column caused stress on the phytoplankton and influenced the species composition negatively depending on the sensitivity of groups and the natural variability of the ecosystem.
Reproductive effort of an endemic major reef builder along an inshore–offshore gradient in south-western Atlantic
Authors: Pires Débora O. , Segal Bárbara , Caparelli Alice C. 
Published: June 2010

Mussismilia braziliensisis endemic to the south-western Atlantic, where it plays an important role as a major reef builder. It occurs in a wide range of sediment conditions between coastal and offshore environments. Here, we investigated its reproductive effort along an inshore–offshore gradient. Three sites were sampled with varying distances (15 to 60 km) from the mainland in the Abrolhos Reef Complex (18° S). Reproductive effort was estimated as fecundity (number of eggs per: polyp, cm2, mm3, and mesenteries). Mean fecundity per polyp was 338.7 (±73.5 SD) and the highest number of eggs per polyp was 987. Percentages of fertile mesenteries per polyp were similar among sites. However, the fecundity per mesentery varied among colonies and among sites. Fecundity per polyp increased as its area, volume, height and number of fertile mesenteries increases. The area closest to the coast (‘Pedra de Leste’) presented the highest mean fecundity per polyp (410 eggs ± 159.2 SD), cm2(233.47 eggs ± 219.44 SD), mm3(4.95 eggs ± 2.34 SD) and mesentery (10.6 eggs ± 4.3 SD). Corals closest to the coast had 55% higher fecundity per polyp and 64% higher fecundity per cm2than corals offshore. This area presented the highest contribution of non-carbonate sediments deposited on the reefs. Therefore, we suggest that colonies ofM. braziliensismay present higher uptake rates of particulate matter at inshore reefs, which allow for higher rates of tissue growth (less nutrient limitation) and energy allocation to reproduction.
Detrimental effects of antibiotics on mouse embryos in chromatin integrity, apoptosis and expression of zygotically activated genes
Authors: Liu Jun , Tang Shuang , Xu Wei , Wang Yongsheng , Yin Baoying , Zhang Yong 
Published: June 2010

SummaryThe effects of specific components in culture medium on embryo physiology have been extensively investigated to optimizein vitroculture systems; however, little attention has been paid to antibiotics, the reagents used most commonly in culture systems to prevent contamination. To investigate the potential effects of routine use of antibiotics on cultured embryos, mouse zygotes were cultured with or without antibiotics. In both groups, the developmental rate and cell number of blastocysts appear to be normal. The proportion of embryos with blastomere fragmentation increased slightly when embryos were cultured with antibiotics. In contrast, the presence of antibiotics in the embryo culture system significantly disturbs expression of zygotically activated genes, damages chromatin integrity and increases apoptosis of cultured embryos. These results provide evidence that, when cultured with antibiotics, embryos with normal appearance may possess intrinsic physiological and genetic abnormalities. We demonstrate that the adverse effects of antibiotics on mammalian embryos are more severe than we previously presumed and that antibiotics are not essential for sterility of embryo culture system therefore abolishing antibiotic supplementation during embryo culture.
South Korean Attitudes toward the ROK–U.S. Alliance: Group Analysis
Authors: Chae Haesook 
Published: June 2010

AbstractThis article focuses on South Korean attitudes toward the South Korean-U.S. alliance by comparing three political groups. Using a nationwide survey of South Koreans conducted in 2007, it performs two quantitative analyses: cluster analysis to identify distinct political groups and regression analysis to test hypotheses drawn from literature about what influences public attitudes toward the alliance. This study draws four major conclusions about attitudes toward the alliance: (1) There is strong support for the alliance among South Koreans, including anti-American progressives. (2) For conservatives and centrists, the traditional rationale for the alliance—deterrence of North Korean aggression—remains a basic foundation for the alliance. (3) Among the three groups, there is a developing consensus on a new rationale for the alliance of promoting inter-Korean reconciliation. (4) The younger generation, which constitutes a large majority of the voting public, exhibits moderation and pragmatism in its ideological orientation, contradicting the commonly held view that it heavily slants progressive. These findings can offer important guidance for the future of the alliance.
An inequality for the Riemann-Stieltjes integral
Authors: Darst Richard , Pollard Harry 
Published: June 2010

Let

g
g

and

h
h

be real valued and continuous on the interval

[
a
,
b
]

[a,b]

, and suppose that the variation,

V
[
h
]

V[h]

, of

h
h

on

[
a
,
b
]

[a,b]

is finite. By completely elementary methods, it is shown that

V
[
h
]
⋅

sup

a
≦
α
>
β
≦
b

(
g
(
β
)
−
g
(
α
)
)

V[h] \cdot {\sup _{_{a \leqq \alpha > \beta \leqq b}}}(g(\beta ) - g(\alpha ))

is an upper bound for

∫
a
b

(
h
−
inf
h
)
d
g

\int _a^b {(h - \inf h)dg}

.
An upper asymptotic estimate of Brownian path variation
Authors: Stackelberg Olaf P. 
Published: June 2010

Let

X
(
t
,
ω
)

X(t,\omega )

be standard Brownian motion, and denote by

B

n

{\mathfrak {B}_n}

the family of all partitions of

[
0
,
1
]

[0, 1]

with minimum distance between successive partition points

≧
1

/

n

\geqq 1/n

. Then
\[

P
[
lim

sup

n
→
∞

sup

P
∈

B

2
n

log
⁡
log
⁡
n

log
2

⁡
n

∑

t
i

∈
P

(
X
(

t
i

)
−
X
(

t

i
−
1

)

)
2

≦
K

]
=
1

P[ \lim \sup _{n \to \infty } \sup _{P \in \mathfrak {B}_{2n} \frac {\log \log n}{\log ^2 n} \sum \limits _{t_i \in P} (X(t_i) - X(t_{i - 1}))^2 \leqq K} ] = 1

\]
where

K
K

is an appropriate constant.
Remarks on pseudo-contractive mappings
Authors: Kirk W. A. 
Published: June 2010

Let

X
X

be a Banach space,

D
⊂
X

D \subset X

. A mapping

U
:
D
→
X

U:D \to X

is said to be pseudo-contractive if for all

u
,
v
∈
D

u,v \in D

and all

r
>
0

r > 0

,

|

|

u
−
v

|

|

≦

|

|

(
1
+
r
)
(
u
−
v
)
−
r
(
U
(
u
)
−
U
(
v
)
)

|

|

||u - v|| \leqq ||(1 + r)(u - v) - r(U(u) - U(v))||

. This concept is due to F. E. Browder, who showed that

U
:
X
→
X

U:X \to X

is pseudo-contractive if and only if

I
−
U

I - U

is accretive. In this paper it is shown that if

X
X

is a uniformly convex Banach,

B
B

a closed ball in

X
X

, and

U
U

a Lipschitzian pseudo-contractive mapping of

B
B

into

X
X

which maps the boundary of

B
B

into

B
B

, then

U
U

has a fixed point in

B
B

. This result is closely related to a recent theorem of Browder.
Seminormal operators with compact self-commutators
Authors: Clancey Kevin 
Published: June 2010

Putnam’s inequality

π

|

|

T
∗

T
−
T

T
∗

|

|

≦

meas
2

⁡
(

sp

(
T
)
)

\pi ||{T^ \ast }T - T{T^ \ast }|| \leqq \operatorname {meas}_2({\text {sp}}(T))

is verified for seminormal operators

T
T

when

T
∗

T
−
T

T
∗

{T^ \ast }T - T{T^ \ast }

is compact. The spectrum of the seminormal singular integral operator defined for

f
∈

L
2

(
0
,
1
)

f \in {L^2}(0,1)

by
\[

T
f
(
s
)
=
s
f
(
s
)
+
i

(

ϕ
(
s
)

π
i

∫
0
1

f
(
t
)

ϕ
¯

(
t
)

s
−
t

d
t

)

,

s
∈
[
0
,
1
]
,

Tf(s) = sf(s) + i\left ( {\frac {{\phi (s)}}{{\pi i}}\int _0^1 {\frac {{f(t)\bar \phi (t)}}{{s - t}}dt} } \right ),\quad s \in [0,1],

\]
where

ϕ
\phi

is any fixed essentially bounded measurable function on

[
0
,
1
]

[0,1]

, is computed.
A sufficient condition for nonabelianness of fundamental groups of differentiable manifolds
Authors: Chen Kuo-tsai 
Published: June 2010

In this paper we prove that, if

H
γ

(
X
)

{H^\gamma }(X)

denotes the

r
r

th deRham cohomology group of a connected manifold

X
X

and if the cup product

H
1

(
X
)

∧
R

H
1

(
X
)
→

H
2

(
X
)

{H^1}(X){ \wedge _R}{H^1}(X) \to {H^2}(X)

is not injective, then

π
1

(
X
)

{\pi _1}(X)

is not abelian. As a corollary, if

b
r

{b_r}

is the

r
r

th Betti number, then

1
2

b
1

(

b
1

−
1
)
>

b
2

\frac {1}{2}{b_1}({b_1} - 1) > {b_2}

implies

π
1

(
X
)

{\pi _1}(X)

being nonabelian.
On the uniform asymptotic stability of functional differential equations of the neutral type
Authors: Hale J. K. , Izé A. F. 
Published: June 2010

Consider the functional equations of neutral type (1)

(
d

/

d
t
)
D
(
t
,

x
t

)
=
f
(
t
,

x
t

)

(d/dt)D(t,{x_t}) = f(t,{x_t})

and (2)

(
d

/

d
t
)
[
D
(
t
,

x
t

)
−
G
(
t
,

x
t

)
]
=
f
(
t
,

x
t

)
+
F
(
t
,

x
t

)

(d/dt)[D(t,{x_t}) - G(t,{x_t})] = f(t,{x_t}) + F(t,{x_t})

where

D
,
f

D,f

are bounded linear operators from

C
[
a
,
b
]

C[a,b]

into

R
n

{R^n}

or

C
n

{C^n}

for each fixed

t
t

in

[
0
,
∞
)
,
F
=

F
1

+

F
2

,
G
=

G
1

+

G
2

,

|

F
1

(
t
,
ϕ
)

|

≦
v
(
t
)

|

ϕ

|

,

|

G
1

(
t
,
ϕ
)

|

≦
π
(
t
)

|

ϕ

|

,
π
(
t
)

[0,\infty ),F = {F_1} + {F_2},G = {G_1} + {G_2},|{F_1}(t,\phi )| \leqq v(t)|\phi |,|{G_1}(t,\phi )| \leqq \pi (t)|\phi |,\pi (t)

, bounded and for any

ε
>
0

\varepsilon > 0

, there exists

δ
(
ε
)
>
0

\delta (\varepsilon ) > 0

such that

|

F
2

(
t
,
ϕ
)

|

≦
ε

|

ϕ

|

,

|

G
2

(
t
,
ϕ
)

|

≦
ε

|

ϕ

|

,
t
≧
0
,

|

ϕ

|

>
δ
(
ε
)

|{F_2}(t,\phi )| \leqq \varepsilon |\phi |,|{G_2}(t,\phi )| \leqq \varepsilon |\phi |,t \geqq 0,|\phi | > \delta (\varepsilon )

. The authors prove that if (1) is uniformly asymptotically stable, then there is a

ζ
0

,
0
>

ζ
0

>
1

{\zeta _0},0 > {\zeta _0} > 1

, such that for any

p
>
0
,
0
>
ζ
>

ζ
0

p > 0,0 > \zeta > {\zeta _0}

, there are constants

v
0

>
0
,

M
0

>
0
,

s
0

>
0

{v_0} > 0,{M_0} > 0,{s_0} > 0

, such that if

π
(
t
)
>

M
0

,
t
≧

s
0

,
(
1

/

p
)

∫
t

t
+
p

v
(
s
)
d
s
>
ζ

v
0

,
t
>
0

\pi (t) > {M_0},t \geqq {s_0},(1/p)\int _t^{t + p} {v(s)ds > \zeta {v_0}} ,t > 0

, then the solution

x
=
0

x = 0

of (2) is uniformly asymptotically stable. The result generalizes previous results which consider only terms of the form

F
1

,

G
1

{F_1},{G_1}

or

F

2
,

G
2

{F_{2,}}{G_2}

but not both simultaneously, and the stronger hypothesis

lim

t
→
∞

π
(
t
)
=
0

{\lim _{t \to \infty }}\pi (t) = 0

.
On an asymptotic property of a Volterra integral equation
Authors: Izé A. F. 
Published: June 2010

It is proved that if

q
(
t
−
s
)

q(t - s)

is bounded and

f
(
t
,
x
)

f(t,x)

is “small,” the solutions of the integral equation

x
(
t
)
=
a
(
t
)
+

∫
0
t

q
(
t
−
s
)
f
(
s
,
x
(
s
)
)
d
s

x(t) = a(t) + \int _0^t {q(t - s)f(s,x(s))ds}

satisfies the conditions

x
(
t
)
=
h
(
t
)
+
ρ
(
t
)
a
(
t
)
,

lim

t
→
∞

a
(
t
)
=
a

x(t) = h(t) + \rho (t)a(t),{\lim _{t \to \infty }}a(t) = a

constant where

ρ
(
t
)

\rho (t)

is a nonsingular diagonal matrix chosen in such a way that

ρ
(
t
)
h
(
t
)

\rho (t)h(t)

is bounded. The results are extended to the more general integral equation

x
(
t
)
=
h
(
t
)
+

∫
0
t

F
(
t
,
s
,
x
(
s
)
)
d
s

x(t) = h(t) + \int _0^t {F(t,s,x(s))ds}

and contain, in particular, some results on the boundedness, asymptotic behavior and existence of nonoscillatory solution of differential equations.
A zero-one law for Gaussian processes
Authors: Jain Naresh C. 
Published: June 2010

Let

P
0

{P_0}

be a Gaussian probability measure on the measurable space

(
X
,
B
(
X
)
)

(X,B(X))

, where X is a linear space of realvalued functions over a complete separable metric space T, and

B
(
X
)

B(X)

is the

σ
\sigma

-algebra generated by sets of the form

{
x
∈
X
:
(
x
(

t
1

)
,
⋯
,
x
(

t
n

)
)
∈

B
n

}
;

B
n

\{ x \in X:(x({t_1}), \cdots ,x({t_n})) \in {B^n}\} ;{B^n}

being the Borel sets of

R
n

,
n
≧
1

{R^n},n \geqq 1

. The covariance

R
(
s
,
t
)

R(s,t)

is assumed continuous on

T
×
T

T \times T

. If G is a subgroup of X and belongs to the

σ
\sigma

-algebra

B
0

(
X
)

{B_0}(X)

(the completion of

B
(
X
)

B(X)

with respect to

P
0

{P_0}

), then it is shown that

P
0

(
G
)
=
0

{P_0}(G) = 0

or 1.
Perfect matrix methods
Authors: Fleming D. J. , Jessup P. G. 
Published: June 2010

Let

e
i

=
(

δ

i
j

)

j
=
1

∞

,
Δ
=
(

e
i

)

i
=
1

∞

{e_i} = ({\delta _{ij}})_{j = 1}^\infty ,\Delta = ({e_i})_{i = 1}^\infty

and let A be an infinite matrix which maps E into E where E is an FK-space with Schauder basis

Δ
\Delta

. Necessary and sufficient conditions in terms of the matrix A are obtained for E to be dense in the summability space

E
A

=
{
x

|

A
x
∈
E
}

{E_A} = \{ x | {Ax \in E\} }

and conditions are obtained to guarantee that

E
A

{E_A}

has Schauder basis

Δ
\Delta

. Finally it is shown that if weak and strong sequential convergence coincide in E then in

E
A

{E_A}

the series

∑

k

x
k

e
k

\sum {_k{x_k}{e_k}}

converges to x strongly if and only if it converges to x weakly.